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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Clean ups from Moschip version and a few ioctl implementations by:
4 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
5 *
6 * Originally based on drivers/usb/serial/io_edgeport.c which is:
7 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
8 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15#include <linux/tty.h>
16#include <linux/tty_driver.h>
17#include <linux/tty_flip.h>
18#include <linux/module.h>
19#include <linux/serial.h>
20#include <linux/usb.h>
21#include <linux/usb/serial.h>
22#include <linux/uaccess.h>
23
24#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
25
26/*
27 * 16C50 UART register defines
28 */
29
30#define LCR_BITS_5 0x00 /* 5 bits/char */
31#define LCR_BITS_6 0x01 /* 6 bits/char */
32#define LCR_BITS_7 0x02 /* 7 bits/char */
33#define LCR_BITS_8 0x03 /* 8 bits/char */
34#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
35
36#define LCR_STOP_1 0x00 /* 1 stop bit */
37#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
38#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
39#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
40
41#define LCR_PAR_NONE 0x00 /* No parity */
42#define LCR_PAR_ODD 0x08 /* Odd parity */
43#define LCR_PAR_EVEN 0x18 /* Even parity */
44#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
45#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
46#define LCR_PAR_MASK 0x38 /* Mask for parity field */
47
48#define LCR_SET_BREAK 0x40 /* Set Break condition */
49#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
50
51#define MCR_DTR 0x01 /* Assert DTR */
52#define MCR_RTS 0x02 /* Assert RTS */
53#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
54#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
55#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
56#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
57
58#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
59#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
60#define MOS7840_MSR_RI 0x40 /* Current state of RI */
61#define MOS7840_MSR_CD 0x80 /* Current state of CD */
62
63/*
64 * Defines used for sending commands to port
65 */
66
67#define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
68
69#define MOS_PORT1 0x0200
70#define MOS_PORT2 0x0300
71#define MOS_VENREG 0x0000
72#define MOS_MAX_PORT 0x02
73#define MOS_WRITE 0x0E
74#define MOS_READ 0x0D
75
76/* Requests */
77#define MCS_RD_RTYPE 0xC0
78#define MCS_WR_RTYPE 0x40
79#define MCS_RDREQ 0x0D
80#define MCS_WRREQ 0x0E
81#define MCS_CTRL_TIMEOUT 500
82#define VENDOR_READ_LENGTH (0x01)
83
84#define MAX_NAME_LEN 64
85
86#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
87#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
88
89/* For higher baud Rates use TIOCEXBAUD */
90#define TIOCEXBAUD 0x5462
91
92/*
93 * Vendor id and device id defines
94 *
95 * NOTE: Do not add new defines, add entries directly to the id_table instead.
96 */
97#define USB_VENDOR_ID_BANDB 0x0856
98#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
99#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
100#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
101#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
102#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
103#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
104#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
105#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
106#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
107#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
108#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
109#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
110
111/* Interrupt Routine Defines */
112
113#define SERIAL_IIR_RLS 0x06
114#define SERIAL_IIR_MS 0x00
115
116/*
117 * Emulation of the bit mask on the LINE STATUS REGISTER.
118 */
119#define SERIAL_LSR_DR 0x0001
120#define SERIAL_LSR_OE 0x0002
121#define SERIAL_LSR_PE 0x0004
122#define SERIAL_LSR_FE 0x0008
123#define SERIAL_LSR_BI 0x0010
124
125#define MOS_MSR_DELTA_CTS 0x10
126#define MOS_MSR_DELTA_DSR 0x20
127#define MOS_MSR_DELTA_RI 0x40
128#define MOS_MSR_DELTA_CD 0x80
129
130/* Serial Port register Address */
131#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
132#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
133#define LINE_CONTROL_REGISTER ((__u16)(0x03))
134#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
135#define LINE_STATUS_REGISTER ((__u16)(0x05))
136#define MODEM_STATUS_REGISTER ((__u16)(0x06))
137#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
138#define DIVISOR_LATCH_LSB ((__u16)(0x00))
139#define DIVISOR_LATCH_MSB ((__u16)(0x01))
140
141#define CLK_MULTI_REGISTER ((__u16)(0x02))
142#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
143#define GPIO_REGISTER ((__u16)(0x07))
144
145#define SERIAL_LCR_DLAB ((__u16)(0x0080))
146
147/*
148 * URB POOL related defines
149 */
150#define NUM_URBS 16 /* URB Count */
151#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
152
153/* LED on/off milliseconds*/
154#define LED_ON_MS 500
155#define LED_OFF_MS 500
156
157enum mos7840_flag {
158 MOS7840_FLAG_LED_BUSY,
159};
160
161#define MCS_PORT_MASK GENMASK(2, 0)
162#define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK)
163#define MCS_LED BIT(3)
164
165#define MCS_DEVICE(vid, pid, flags) \
166 USB_DEVICE((vid), (pid)), .driver_info = (flags)
167
168static const struct usb_device_id id_table[] = {
169 { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */
170 { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */
171 { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */
172 { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
173 { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */
174 { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */
175 { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */
176 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
177 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
178 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
179 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
180 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
181 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
182 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
183 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
184 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
185 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
186 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
187 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
188 {} /* terminating entry */
189};
190MODULE_DEVICE_TABLE(usb, id_table);
191
192/* This structure holds all of the local port information */
193
194struct moschip_port {
195 int port_num; /*Actual port number in the device(1,2,etc) */
196 struct urb *read_urb; /* read URB for this port */
197 __u8 shadowLCR; /* last LCR value received */
198 __u8 shadowMCR; /* last MCR value received */
199 struct usb_serial_port *port; /* loop back to the owner of this object */
200
201 /* Offsets */
202 __u8 SpRegOffset;
203 __u8 ControlRegOffset;
204 __u8 DcrRegOffset;
205
206 spinlock_t pool_lock;
207 struct urb *write_urb_pool[NUM_URBS];
208 char busy[NUM_URBS];
209 bool read_urb_busy;
210
211 /* For device(s) with LED indicator */
212 bool has_led;
213 struct timer_list led_timer1; /* Timer for LED on */
214 struct timer_list led_timer2; /* Timer for LED off */
215 struct urb *led_urb;
216 struct usb_ctrlrequest *led_dr;
217
218 unsigned long flags;
219};
220
221/*
222 * mos7840_set_reg_sync
223 * To set the Control register by calling usb_fill_control_urb function
224 * by passing usb_sndctrlpipe function as parameter.
225 */
226
227static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
228 __u16 val)
229{
230 struct usb_device *dev = port->serial->dev;
231 val = val & 0x00ff;
232 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
233
234 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
235 MCS_WR_RTYPE, val, reg, NULL, 0,
236 MOS_WDR_TIMEOUT);
237}
238
239/*
240 * mos7840_get_reg_sync
241 * To set the Uart register by calling usb_fill_control_urb function by
242 * passing usb_rcvctrlpipe function as parameter.
243 */
244
245static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
246 __u16 *val)
247{
248 struct usb_device *dev = port->serial->dev;
249 int ret = 0;
250 u8 *buf;
251
252 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
253 if (!buf)
254 return -ENOMEM;
255
256 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
257 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
258 MOS_WDR_TIMEOUT);
259 if (ret < VENDOR_READ_LENGTH) {
260 if (ret >= 0)
261 ret = -EIO;
262 goto out;
263 }
264
265 *val = buf[0];
266 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
267out:
268 kfree(buf);
269 return ret;
270}
271
272/*
273 * mos7840_set_uart_reg
274 * To set the Uart register by calling usb_fill_control_urb function by
275 * passing usb_sndctrlpipe function as parameter.
276 */
277
278static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
279 __u16 val)
280{
281
282 struct usb_device *dev = port->serial->dev;
283 val = val & 0x00ff;
284 /* For the UART control registers, the application number need
285 to be Or'ed */
286 if (port->serial->num_ports == 2 && port->port_number != 0)
287 val |= ((__u16)port->port_number + 2) << 8;
288 else
289 val |= ((__u16)port->port_number + 1) << 8;
290 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
291 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
292 MCS_WR_RTYPE, val, reg, NULL, 0,
293 MOS_WDR_TIMEOUT);
294
295}
296
297/*
298 * mos7840_get_uart_reg
299 * To set the Control register by calling usb_fill_control_urb function
300 * by passing usb_rcvctrlpipe function as parameter.
301 */
302static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
303 __u16 *val)
304{
305 struct usb_device *dev = port->serial->dev;
306 int ret = 0;
307 __u16 Wval;
308 u8 *buf;
309
310 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
311 if (!buf)
312 return -ENOMEM;
313
314 /* Wval is same as application number */
315 if (port->serial->num_ports == 2 && port->port_number != 0)
316 Wval = ((__u16)port->port_number + 2) << 8;
317 else
318 Wval = ((__u16)port->port_number + 1) << 8;
319 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
320 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
321 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
322 MOS_WDR_TIMEOUT);
323 if (ret < VENDOR_READ_LENGTH) {
324 if (ret >= 0)
325 ret = -EIO;
326 goto out;
327 }
328 *val = buf[0];
329out:
330 kfree(buf);
331 return ret;
332}
333
334static void mos7840_dump_serial_port(struct usb_serial_port *port,
335 struct moschip_port *mos7840_port)
336{
337
338 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
339 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
340 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
341
342}
343
344/************************************************************************/
345/************************************************************************/
346/* U S B C A L L B A C K F U N C T I O N S */
347/* U S B C A L L B A C K F U N C T I O N S */
348/************************************************************************/
349/************************************************************************/
350
351static void mos7840_set_led_callback(struct urb *urb)
352{
353 switch (urb->status) {
354 case 0:
355 /* Success */
356 break;
357 case -ECONNRESET:
358 case -ENOENT:
359 case -ESHUTDOWN:
360 /* This urb is terminated, clean up */
361 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
362 __func__, urb->status);
363 break;
364 default:
365 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
366 __func__, urb->status);
367 }
368}
369
370static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
371 __u16 reg)
372{
373 struct usb_device *dev = mcs->port->serial->dev;
374 struct usb_ctrlrequest *dr = mcs->led_dr;
375
376 dr->bRequestType = MCS_WR_RTYPE;
377 dr->bRequest = MCS_WRREQ;
378 dr->wValue = cpu_to_le16(wval);
379 dr->wIndex = cpu_to_le16(reg);
380 dr->wLength = cpu_to_le16(0);
381
382 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
383 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
384
385 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
386}
387
388static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
389 __u16 val)
390{
391 struct usb_device *dev = port->serial->dev;
392
393 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
394 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
395}
396
397static void mos7840_led_off(struct timer_list *t)
398{
399 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
400
401 /* Turn off LED */
402 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
403 mod_timer(&mcs->led_timer2,
404 jiffies + msecs_to_jiffies(LED_OFF_MS));
405}
406
407static void mos7840_led_flag_off(struct timer_list *t)
408{
409 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
410
411 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
412}
413
414static void mos7840_led_activity(struct usb_serial_port *port)
415{
416 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
417
418 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
419 return;
420
421 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
422 mod_timer(&mos7840_port->led_timer1,
423 jiffies + msecs_to_jiffies(LED_ON_MS));
424}
425
426/*****************************************************************************
427 * mos7840_bulk_in_callback
428 * this is the callback function for when we have received data on the
429 * bulk in endpoint.
430 *****************************************************************************/
431
432static void mos7840_bulk_in_callback(struct urb *urb)
433{
434 struct moschip_port *mos7840_port = urb->context;
435 struct usb_serial_port *port = mos7840_port->port;
436 int retval;
437 unsigned char *data;
438 int status = urb->status;
439
440 if (status) {
441 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
442 mos7840_port->read_urb_busy = false;
443 return;
444 }
445
446 data = urb->transfer_buffer;
447 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
448
449 if (urb->actual_length) {
450 struct tty_port *tport = &mos7840_port->port->port;
451 tty_insert_flip_string(tport, data, urb->actual_length);
452 tty_flip_buffer_push(tport);
453 port->icount.rx += urb->actual_length;
454 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
455 }
456
457 if (mos7840_port->has_led)
458 mos7840_led_activity(port);
459
460 mos7840_port->read_urb_busy = true;
461 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
462
463 if (retval) {
464 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
465 mos7840_port->read_urb_busy = false;
466 }
467}
468
469/*****************************************************************************
470 * mos7840_bulk_out_data_callback
471 * this is the callback function for when we have finished sending
472 * serial data on the bulk out endpoint.
473 *****************************************************************************/
474
475static void mos7840_bulk_out_data_callback(struct urb *urb)
476{
477 struct moschip_port *mos7840_port = urb->context;
478 struct usb_serial_port *port = mos7840_port->port;
479 int status = urb->status;
480 unsigned long flags;
481 int i;
482
483 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
484 for (i = 0; i < NUM_URBS; i++) {
485 if (urb == mos7840_port->write_urb_pool[i]) {
486 mos7840_port->busy[i] = 0;
487 break;
488 }
489 }
490 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
491
492 if (status) {
493 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
494 return;
495 }
496
497 tty_port_tty_wakeup(&port->port);
498
499}
500
501/************************************************************************/
502/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
503/************************************************************************/
504
505/*****************************************************************************
506 * mos7840_open
507 * this function is called by the tty driver when a port is opened
508 * If successful, we return 0
509 * Otherwise we return a negative error number.
510 *****************************************************************************/
511
512static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
513{
514 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
515 struct usb_serial *serial = port->serial;
516 int response;
517 int j;
518 struct urb *urb;
519 __u16 Data;
520 int status;
521
522 usb_clear_halt(serial->dev, port->write_urb->pipe);
523 usb_clear_halt(serial->dev, port->read_urb->pipe);
524
525 /* Initialising the write urb pool */
526 for (j = 0; j < NUM_URBS; ++j) {
527 urb = usb_alloc_urb(0, GFP_KERNEL);
528 mos7840_port->write_urb_pool[j] = urb;
529 if (!urb)
530 continue;
531
532 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
533 GFP_KERNEL);
534 if (!urb->transfer_buffer) {
535 usb_free_urb(urb);
536 mos7840_port->write_urb_pool[j] = NULL;
537 continue;
538 }
539 }
540
541/*****************************************************************************
542 * Initialize MCS7840 -- Write Init values to corresponding Registers
543 *
544 * Register Index
545 * 1 : IER
546 * 2 : FCR
547 * 3 : LCR
548 * 4 : MCR
549 *
550 * 0x08 : SP1/2 Control Reg
551 *****************************************************************************/
552
553 /* NEED to check the following Block */
554
555 Data = 0x0;
556 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
557 if (status < 0) {
558 dev_dbg(&port->dev, "Reading Spreg failed\n");
559 goto err;
560 }
561 Data |= 0x80;
562 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
563 if (status < 0) {
564 dev_dbg(&port->dev, "writing Spreg failed\n");
565 goto err;
566 }
567
568 Data &= ~0x80;
569 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
570 if (status < 0) {
571 dev_dbg(&port->dev, "writing Spreg failed\n");
572 goto err;
573 }
574 /* End of block to be checked */
575
576 Data = 0x0;
577 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
578 &Data);
579 if (status < 0) {
580 dev_dbg(&port->dev, "Reading Controlreg failed\n");
581 goto err;
582 }
583 Data |= 0x08; /* Driver done bit */
584 Data |= 0x20; /* rx_disable */
585 status = mos7840_set_reg_sync(port,
586 mos7840_port->ControlRegOffset, Data);
587 if (status < 0) {
588 dev_dbg(&port->dev, "writing Controlreg failed\n");
589 goto err;
590 }
591 /* do register settings here */
592 /* Set all regs to the device default values. */
593 /***********************************
594 * First Disable all interrupts.
595 ***********************************/
596 Data = 0x00;
597 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
598 if (status < 0) {
599 dev_dbg(&port->dev, "disabling interrupts failed\n");
600 goto err;
601 }
602 /* Set FIFO_CONTROL_REGISTER to the default value */
603 Data = 0x00;
604 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
605 if (status < 0) {
606 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
607 goto err;
608 }
609
610 Data = 0xcf;
611 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
612 if (status < 0) {
613 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
614 goto err;
615 }
616
617 Data = 0x03;
618 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
619 mos7840_port->shadowLCR = Data;
620
621 Data = 0x0b;
622 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
623 mos7840_port->shadowMCR = Data;
624
625 Data = 0x00;
626 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
627 mos7840_port->shadowLCR = Data;
628
629 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
630 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
631
632 Data = 0x0c;
633 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
634
635 Data = 0x0;
636 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
637
638 Data = 0x00;
639 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
640
641 Data = Data & ~SERIAL_LCR_DLAB;
642 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
643 mos7840_port->shadowLCR = Data;
644
645 /* clearing Bulkin and Bulkout Fifo */
646 Data = 0x0;
647 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
648
649 Data = Data | 0x0c;
650 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
651
652 Data = Data & ~0x0c;
653 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
654 /* Finally enable all interrupts */
655 Data = 0x0c;
656 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
657
658 /* clearing rx_disable */
659 Data = 0x0;
660 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
661 &Data);
662 Data = Data & ~0x20;
663 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
664 Data);
665
666 /* rx_negate */
667 Data = 0x0;
668 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
669 &Data);
670 Data = Data | 0x10;
671 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
672 Data);
673
674 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
675 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
676 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
677 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
678 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
679 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
680 mos7840_port->read_urb = port->read_urb;
681
682 /* set up our bulk in urb */
683 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
684 usb_fill_bulk_urb(mos7840_port->read_urb,
685 serial->dev,
686 usb_rcvbulkpipe(serial->dev,
687 (port->bulk_in_endpointAddress) + 2),
688 port->bulk_in_buffer,
689 mos7840_port->read_urb->transfer_buffer_length,
690 mos7840_bulk_in_callback, mos7840_port);
691 } else {
692 usb_fill_bulk_urb(mos7840_port->read_urb,
693 serial->dev,
694 usb_rcvbulkpipe(serial->dev,
695 port->bulk_in_endpointAddress),
696 port->bulk_in_buffer,
697 mos7840_port->read_urb->transfer_buffer_length,
698 mos7840_bulk_in_callback, mos7840_port);
699 }
700
701 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
702 mos7840_port->read_urb_busy = true;
703 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
704 if (response) {
705 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
706 __func__, response);
707 mos7840_port->read_urb_busy = false;
708 }
709
710 /* initialize our port settings */
711 /* Must set to enable ints! */
712 mos7840_port->shadowMCR = MCR_MASTER_IE;
713
714 return 0;
715err:
716 for (j = 0; j < NUM_URBS; ++j) {
717 urb = mos7840_port->write_urb_pool[j];
718 if (!urb)
719 continue;
720 kfree(urb->transfer_buffer);
721 usb_free_urb(urb);
722 }
723 return status;
724}
725
726/*****************************************************************************
727 * mos7840_chars_in_buffer
728 * this function is called by the tty driver when it wants to know how many
729 * bytes of data we currently have outstanding in the port (data that has
730 * been written, but hasn't made it out the port yet)
731 *****************************************************************************/
732
733static unsigned int mos7840_chars_in_buffer(struct tty_struct *tty)
734{
735 struct usb_serial_port *port = tty->driver_data;
736 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
737 int i;
738 unsigned int chars = 0;
739 unsigned long flags;
740
741 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
742 for (i = 0; i < NUM_URBS; ++i) {
743 if (mos7840_port->busy[i]) {
744 struct urb *urb = mos7840_port->write_urb_pool[i];
745 chars += urb->transfer_buffer_length;
746 }
747 }
748 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
749 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
750 return chars;
751
752}
753
754/*****************************************************************************
755 * mos7840_close
756 * this function is called by the tty driver when a port is closed
757 *****************************************************************************/
758
759static void mos7840_close(struct usb_serial_port *port)
760{
761 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
762 int j;
763 __u16 Data;
764
765 for (j = 0; j < NUM_URBS; ++j)
766 usb_kill_urb(mos7840_port->write_urb_pool[j]);
767
768 /* Freeing Write URBs */
769 for (j = 0; j < NUM_URBS; ++j) {
770 if (mos7840_port->write_urb_pool[j]) {
771 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
772 usb_free_urb(mos7840_port->write_urb_pool[j]);
773 }
774 }
775
776 usb_kill_urb(mos7840_port->read_urb);
777 mos7840_port->read_urb_busy = false;
778
779 Data = 0x0;
780 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
781
782 Data = 0x00;
783 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
784}
785
786/*****************************************************************************
787 * mos7840_break
788 * this function sends a break to the port
789 *****************************************************************************/
790static int mos7840_break(struct tty_struct *tty, int break_state)
791{
792 struct usb_serial_port *port = tty->driver_data;
793 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
794 unsigned char data;
795
796 if (break_state == -1)
797 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
798 else
799 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
800
801 /* FIXME: no locking on shadowLCR anywhere in driver */
802 mos7840_port->shadowLCR = data;
803 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
804
805 return mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
806 mos7840_port->shadowLCR);
807}
808
809/*****************************************************************************
810 * mos7840_write_room
811 * this function is called by the tty driver when it wants to know how many
812 * bytes of data we can accept for a specific port.
813 *****************************************************************************/
814
815static unsigned int mos7840_write_room(struct tty_struct *tty)
816{
817 struct usb_serial_port *port = tty->driver_data;
818 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
819 int i;
820 unsigned int room = 0;
821 unsigned long flags;
822
823 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
824 for (i = 0; i < NUM_URBS; ++i) {
825 if (!mos7840_port->busy[i])
826 room += URB_TRANSFER_BUFFER_SIZE;
827 }
828 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
829
830 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
831 dev_dbg(&mos7840_port->port->dev, "%s - returns %u\n", __func__, room);
832 return room;
833
834}
835
836/*****************************************************************************
837 * mos7840_write
838 * this function is called by the tty driver when data should be written to
839 * the port.
840 * If successful, we return the number of bytes written, otherwise we
841 * return a negative error number.
842 *****************************************************************************/
843
844static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
845 const unsigned char *data, int count)
846{
847 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
848 struct usb_serial *serial = port->serial;
849 int status;
850 int i;
851 int bytes_sent = 0;
852 int transfer_size;
853 unsigned long flags;
854 struct urb *urb;
855 /* __u16 Data; */
856 const unsigned char *current_position = data;
857
858 /* try to find a free urb in the list */
859 urb = NULL;
860
861 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
862 for (i = 0; i < NUM_URBS; ++i) {
863 if (!mos7840_port->busy[i]) {
864 mos7840_port->busy[i] = 1;
865 urb = mos7840_port->write_urb_pool[i];
866 dev_dbg(&port->dev, "URB:%d\n", i);
867 break;
868 }
869 }
870 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
871
872 if (urb == NULL) {
873 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
874 goto exit;
875 }
876
877 if (urb->transfer_buffer == NULL) {
878 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
879 GFP_ATOMIC);
880 if (!urb->transfer_buffer) {
881 bytes_sent = -ENOMEM;
882 goto exit;
883 }
884 }
885 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
886
887 memcpy(urb->transfer_buffer, current_position, transfer_size);
888
889 /* fill urb with data and submit */
890 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
891 usb_fill_bulk_urb(urb,
892 serial->dev,
893 usb_sndbulkpipe(serial->dev,
894 (port->bulk_out_endpointAddress) + 2),
895 urb->transfer_buffer,
896 transfer_size,
897 mos7840_bulk_out_data_callback, mos7840_port);
898 } else {
899 usb_fill_bulk_urb(urb,
900 serial->dev,
901 usb_sndbulkpipe(serial->dev,
902 port->bulk_out_endpointAddress),
903 urb->transfer_buffer,
904 transfer_size,
905 mos7840_bulk_out_data_callback, mos7840_port);
906 }
907
908 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
909
910 if (mos7840_port->has_led)
911 mos7840_led_activity(port);
912
913 /* send it down the pipe */
914 status = usb_submit_urb(urb, GFP_ATOMIC);
915
916 if (status) {
917 mos7840_port->busy[i] = 0;
918 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
919 "with status = %d\n", __func__, status);
920 bytes_sent = status;
921 goto exit;
922 }
923 bytes_sent = transfer_size;
924 port->icount.tx += transfer_size;
925 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
926exit:
927 return bytes_sent;
928
929}
930
931/*****************************************************************************
932 * mos7840_throttle
933 * this function is called by the tty driver when it wants to stop the data
934 * being read from the port.
935 *****************************************************************************/
936
937static void mos7840_throttle(struct tty_struct *tty)
938{
939 struct usb_serial_port *port = tty->driver_data;
940 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
941 int status;
942
943 /* if we are implementing XON/XOFF, send the stop character */
944 if (I_IXOFF(tty)) {
945 unsigned char stop_char = STOP_CHAR(tty);
946 status = mos7840_write(tty, port, &stop_char, 1);
947 if (status <= 0)
948 return;
949 }
950 /* if we are implementing RTS/CTS, toggle that line */
951 if (C_CRTSCTS(tty)) {
952 mos7840_port->shadowMCR &= ~MCR_RTS;
953 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
954 mos7840_port->shadowMCR);
955 if (status < 0)
956 return;
957 }
958}
959
960/*****************************************************************************
961 * mos7840_unthrottle
962 * this function is called by the tty driver when it wants to resume
963 * the data being read from the port (called after mos7840_throttle is
964 * called)
965 *****************************************************************************/
966static void mos7840_unthrottle(struct tty_struct *tty)
967{
968 struct usb_serial_port *port = tty->driver_data;
969 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
970 int status;
971
972 /* if we are implementing XON/XOFF, send the start character */
973 if (I_IXOFF(tty)) {
974 unsigned char start_char = START_CHAR(tty);
975 status = mos7840_write(tty, port, &start_char, 1);
976 if (status <= 0)
977 return;
978 }
979
980 /* if we are implementing RTS/CTS, toggle that line */
981 if (C_CRTSCTS(tty)) {
982 mos7840_port->shadowMCR |= MCR_RTS;
983 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
984 mos7840_port->shadowMCR);
985 if (status < 0)
986 return;
987 }
988}
989
990static int mos7840_tiocmget(struct tty_struct *tty)
991{
992 struct usb_serial_port *port = tty->driver_data;
993 unsigned int result;
994 __u16 msr;
995 __u16 mcr;
996 int status;
997
998 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
999 if (status < 0)
1000 return -EIO;
1001 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1002 if (status < 0)
1003 return -EIO;
1004 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1005 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1006 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1007 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1008 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1009 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1010 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1011
1012 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1013
1014 return result;
1015}
1016
1017static int mos7840_tiocmset(struct tty_struct *tty,
1018 unsigned int set, unsigned int clear)
1019{
1020 struct usb_serial_port *port = tty->driver_data;
1021 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1022 unsigned int mcr;
1023 int status;
1024
1025 /* FIXME: What locks the port registers ? */
1026 mcr = mos7840_port->shadowMCR;
1027 if (clear & TIOCM_RTS)
1028 mcr &= ~MCR_RTS;
1029 if (clear & TIOCM_DTR)
1030 mcr &= ~MCR_DTR;
1031 if (clear & TIOCM_LOOP)
1032 mcr &= ~MCR_LOOPBACK;
1033
1034 if (set & TIOCM_RTS)
1035 mcr |= MCR_RTS;
1036 if (set & TIOCM_DTR)
1037 mcr |= MCR_DTR;
1038 if (set & TIOCM_LOOP)
1039 mcr |= MCR_LOOPBACK;
1040
1041 mos7840_port->shadowMCR = mcr;
1042
1043 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1044 if (status < 0) {
1045 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1046 return status;
1047 }
1048
1049 return 0;
1050}
1051
1052/*****************************************************************************
1053 * mos7840_calc_baud_rate_divisor
1054 * this function calculates the proper baud rate divisor for the specified
1055 * baud rate.
1056 *****************************************************************************/
1057static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1058 int baudRate, int *divisor,
1059 __u16 *clk_sel_val)
1060{
1061 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1062
1063 if (baudRate <= 115200) {
1064 *divisor = 115200 / baudRate;
1065 *clk_sel_val = 0x0;
1066 }
1067 if ((baudRate > 115200) && (baudRate <= 230400)) {
1068 *divisor = 230400 / baudRate;
1069 *clk_sel_val = 0x10;
1070 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1071 *divisor = 403200 / baudRate;
1072 *clk_sel_val = 0x20;
1073 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1074 *divisor = 460800 / baudRate;
1075 *clk_sel_val = 0x30;
1076 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1077 *divisor = 806400 / baudRate;
1078 *clk_sel_val = 0x40;
1079 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1080 *divisor = 921600 / baudRate;
1081 *clk_sel_val = 0x50;
1082 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1083 *divisor = 1572864 / baudRate;
1084 *clk_sel_val = 0x60;
1085 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1086 *divisor = 3145728 / baudRate;
1087 *clk_sel_val = 0x70;
1088 }
1089 return 0;
1090}
1091
1092/*****************************************************************************
1093 * mos7840_send_cmd_write_baud_rate
1094 * this function sends the proper command to change the baud rate of the
1095 * specified port.
1096 *****************************************************************************/
1097
1098static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1099 int baudRate)
1100{
1101 struct usb_serial_port *port = mos7840_port->port;
1102 int divisor = 0;
1103 int status;
1104 __u16 Data;
1105 __u16 clk_sel_val;
1106
1107 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1108 /* reset clk_uart_sel in spregOffset */
1109 if (baudRate > 115200) {
1110#ifdef HW_flow_control
1111 /* NOTE: need to see the pther register to modify */
1112 /* setting h/w flow control bit to 1 */
1113 Data = 0x2b;
1114 mos7840_port->shadowMCR = Data;
1115 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1116 Data);
1117 if (status < 0) {
1118 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1119 return -1;
1120 }
1121#endif
1122
1123 } else {
1124#ifdef HW_flow_control
1125 /* setting h/w flow control bit to 0 */
1126 Data = 0xb;
1127 mos7840_port->shadowMCR = Data;
1128 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1129 Data);
1130 if (status < 0) {
1131 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1132 return -1;
1133 }
1134#endif
1135
1136 }
1137
1138 if (1) { /* baudRate <= 115200) */
1139 clk_sel_val = 0x0;
1140 Data = 0x0;
1141 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1142 &clk_sel_val);
1143 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1144 &Data);
1145 if (status < 0) {
1146 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1147 return -1;
1148 }
1149 Data = (Data & 0x8f) | clk_sel_val;
1150 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1151 Data);
1152 if (status < 0) {
1153 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1154 return -1;
1155 }
1156 /* Calculate the Divisor */
1157
1158 if (status) {
1159 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1160 return status;
1161 }
1162 /* Enable access to divisor latch */
1163 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1164 mos7840_port->shadowLCR = Data;
1165 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1166
1167 /* Write the divisor */
1168 Data = (unsigned char)(divisor & 0xff);
1169 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1170 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1171
1172 Data = (unsigned char)((divisor & 0xff00) >> 8);
1173 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1174 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1175
1176 /* Disable access to divisor latch */
1177 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1178 mos7840_port->shadowLCR = Data;
1179 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1180
1181 }
1182 return status;
1183}
1184
1185/*****************************************************************************
1186 * mos7840_change_port_settings
1187 * This routine is called to set the UART on the device to match
1188 * the specified new settings.
1189 *****************************************************************************/
1190
1191static void mos7840_change_port_settings(struct tty_struct *tty,
1192 struct moschip_port *mos7840_port,
1193 const struct ktermios *old_termios)
1194{
1195 struct usb_serial_port *port = mos7840_port->port;
1196 int baud;
1197 unsigned cflag;
1198 __u8 lData;
1199 __u8 lParity;
1200 __u8 lStop;
1201 int status;
1202 __u16 Data;
1203
1204 lData = LCR_BITS_8;
1205 lStop = LCR_STOP_1;
1206 lParity = LCR_PAR_NONE;
1207
1208 cflag = tty->termios.c_cflag;
1209
1210 /* Change the number of bits */
1211 switch (cflag & CSIZE) {
1212 case CS5:
1213 lData = LCR_BITS_5;
1214 break;
1215
1216 case CS6:
1217 lData = LCR_BITS_6;
1218 break;
1219
1220 case CS7:
1221 lData = LCR_BITS_7;
1222 break;
1223
1224 default:
1225 case CS8:
1226 lData = LCR_BITS_8;
1227 break;
1228 }
1229
1230 /* Change the Parity bit */
1231 if (cflag & PARENB) {
1232 if (cflag & PARODD) {
1233 lParity = LCR_PAR_ODD;
1234 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1235 } else {
1236 lParity = LCR_PAR_EVEN;
1237 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1238 }
1239
1240 } else {
1241 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1242 }
1243
1244 if (cflag & CMSPAR)
1245 lParity = lParity | 0x20;
1246
1247 /* Change the Stop bit */
1248 if (cflag & CSTOPB) {
1249 lStop = LCR_STOP_2;
1250 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1251 } else {
1252 lStop = LCR_STOP_1;
1253 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1254 }
1255
1256 /* Update the LCR with the correct value */
1257 mos7840_port->shadowLCR &=
1258 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1259 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1260
1261 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1262 mos7840_port->shadowLCR);
1263 /* Disable Interrupts */
1264 Data = 0x00;
1265 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1266
1267 Data = 0x00;
1268 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1269
1270 Data = 0xcf;
1271 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1272
1273 /* Send the updated LCR value to the mos7840 */
1274 Data = mos7840_port->shadowLCR;
1275
1276 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1277
1278 Data = 0x00b;
1279 mos7840_port->shadowMCR = Data;
1280 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1281 Data = 0x00b;
1282 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1283
1284 /* set up the MCR register and send it to the mos7840 */
1285
1286 mos7840_port->shadowMCR = MCR_MASTER_IE;
1287 if (cflag & CBAUD)
1288 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1289
1290 if (cflag & CRTSCTS)
1291 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1292 else
1293 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1294
1295 Data = mos7840_port->shadowMCR;
1296 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1297
1298 /* Determine divisor based on baud rate */
1299 baud = tty_get_baud_rate(tty);
1300
1301 if (!baud) {
1302 /* pick a default, any default... */
1303 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1304 baud = 9600;
1305 }
1306
1307 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1308 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1309
1310 /* Enable Interrupts */
1311 Data = 0x0c;
1312 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1313
1314 if (!mos7840_port->read_urb_busy) {
1315 mos7840_port->read_urb_busy = true;
1316 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1317 if (status) {
1318 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1319 status);
1320 mos7840_port->read_urb_busy = false;
1321 }
1322 }
1323 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1324 mos7840_port->shadowLCR);
1325}
1326
1327/*****************************************************************************
1328 * mos7840_set_termios
1329 * this function is called by the tty driver when it wants to change
1330 * the termios structure
1331 *****************************************************************************/
1332
1333static void mos7840_set_termios(struct tty_struct *tty,
1334 struct usb_serial_port *port,
1335 const struct ktermios *old_termios)
1336{
1337 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1338 int status;
1339
1340 /* change the port settings to the new ones specified */
1341
1342 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1343
1344 if (!mos7840_port->read_urb_busy) {
1345 mos7840_port->read_urb_busy = true;
1346 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1347 if (status) {
1348 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1349 status);
1350 mos7840_port->read_urb_busy = false;
1351 }
1352 }
1353}
1354
1355/*****************************************************************************
1356 * mos7840_get_lsr_info - get line status register info
1357 *
1358 * Purpose: Let user call ioctl() to get info when the UART physically
1359 * is emptied. On bus types like RS485, the transmitter must
1360 * release the bus after transmitting. This must be done when
1361 * the transmit shift register is empty, not be done when the
1362 * transmit holding register is empty. This functionality
1363 * allows an RS485 driver to be written in user space.
1364 *****************************************************************************/
1365
1366static int mos7840_get_lsr_info(struct tty_struct *tty,
1367 unsigned int __user *value)
1368{
1369 int count;
1370 unsigned int result = 0;
1371
1372 count = mos7840_chars_in_buffer(tty);
1373 if (count == 0)
1374 result = TIOCSER_TEMT;
1375
1376 if (copy_to_user(value, &result, sizeof(int)))
1377 return -EFAULT;
1378 return 0;
1379}
1380
1381/*****************************************************************************
1382 * SerialIoctl
1383 * this function handles any ioctl calls to the driver
1384 *****************************************************************************/
1385
1386static int mos7840_ioctl(struct tty_struct *tty,
1387 unsigned int cmd, unsigned long arg)
1388{
1389 struct usb_serial_port *port = tty->driver_data;
1390 void __user *argp = (void __user *)arg;
1391
1392 switch (cmd) {
1393 /* return number of bytes available */
1394
1395 case TIOCSERGETLSR:
1396 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1397 return mos7840_get_lsr_info(tty, argp);
1398
1399 default:
1400 break;
1401 }
1402 return -ENOIOCTLCMD;
1403}
1404
1405/*
1406 * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX
1407 * for MCS7810 by bit-banging a 16-bit word.
1408 *
1409 * Note that GPO is really RTS of the third port so this will toggle RTS of
1410 * port two or three on two- and four-port devices.
1411 */
1412static int mos7810_check(struct usb_serial *serial)
1413{
1414 int i, pass_count = 0;
1415 u8 *buf;
1416 __u16 data = 0, mcr_data = 0;
1417 __u16 test_pattern = 0x55AA;
1418 int res;
1419
1420 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1421 if (!buf)
1422 return 0; /* failed to identify 7810 */
1423
1424 /* Store MCR setting */
1425 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1426 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1427 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1428 if (res == VENDOR_READ_LENGTH)
1429 mcr_data = *buf;
1430
1431 for (i = 0; i < 16; i++) {
1432 /* Send the 1-bit test pattern out to MCS7810 test pin */
1433 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1434 MCS_WRREQ, MCS_WR_RTYPE,
1435 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1436 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1437
1438 /* Read the test pattern back */
1439 res = usb_control_msg(serial->dev,
1440 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1441 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1442 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1443 if (res == VENDOR_READ_LENGTH)
1444 data = *buf;
1445
1446 /* If this is a MCS7810 device, both test patterns must match */
1447 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
1448 break;
1449
1450 pass_count++;
1451 }
1452
1453 /* Restore MCR setting */
1454 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
1455 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
1456 0, MOS_WDR_TIMEOUT);
1457
1458 kfree(buf);
1459
1460 if (pass_count == 16)
1461 return 1;
1462
1463 return 0;
1464}
1465
1466static int mos7840_probe(struct usb_serial *serial,
1467 const struct usb_device_id *id)
1468{
1469 unsigned long device_flags = id->driver_info;
1470 u8 *buf;
1471
1472 /* Skip device-type detection if we already have device flags. */
1473 if (device_flags)
1474 goto out;
1475
1476 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1477 if (!buf)
1478 return -ENOMEM;
1479
1480 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1481 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1482 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1483
1484 /* For a MCS7840 device GPIO0 must be set to 1 */
1485 if (buf[0] & 0x01)
1486 device_flags = MCS_PORTS(4);
1487 else if (mos7810_check(serial))
1488 device_flags = MCS_PORTS(1) | MCS_LED;
1489 else
1490 device_flags = MCS_PORTS(2);
1491
1492 kfree(buf);
1493out:
1494 usb_set_serial_data(serial, (void *)device_flags);
1495
1496 return 0;
1497}
1498
1499static int mos7840_calc_num_ports(struct usb_serial *serial,
1500 struct usb_serial_endpoints *epds)
1501{
1502 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1503 int num_ports = MCS_PORTS(device_flags);
1504
1505 if (num_ports == 0 || num_ports > 4)
1506 return -ENODEV;
1507
1508 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
1509 dev_err(&serial->interface->dev, "missing endpoints\n");
1510 return -ENODEV;
1511 }
1512
1513 return num_ports;
1514}
1515
1516static int mos7840_attach(struct usb_serial *serial)
1517{
1518 struct device *dev = &serial->interface->dev;
1519 int status;
1520 u16 val;
1521
1522 /* Zero Length flag enable */
1523 val = 0x0f;
1524 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val);
1525 if (status < 0)
1526 dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
1527 else
1528 dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status);
1529
1530 return status;
1531}
1532
1533static int mos7840_port_probe(struct usb_serial_port *port)
1534{
1535 struct usb_serial *serial = port->serial;
1536 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1537 struct moschip_port *mos7840_port;
1538 int status;
1539 int pnum;
1540 __u16 Data;
1541
1542 /* we set up the pointers to the endpoints in the mos7840_open *
1543 * function, as the structures aren't created yet. */
1544
1545 pnum = port->port_number;
1546
1547 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
1548 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1549 if (!mos7840_port)
1550 return -ENOMEM;
1551
1552 /* Initialize all port interrupt end point to port 0 int
1553 * endpoint. Our device has only one interrupt end point
1554 * common to all port */
1555
1556 mos7840_port->port = port;
1557 spin_lock_init(&mos7840_port->pool_lock);
1558
1559 /* minor is not initialised until later by
1560 * usb-serial.c:get_free_serial() and cannot therefore be used
1561 * to index device instances */
1562 mos7840_port->port_num = pnum + 1;
1563 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
1564 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
1565
1566 if (mos7840_port->port_num == 1) {
1567 mos7840_port->SpRegOffset = 0x0;
1568 mos7840_port->ControlRegOffset = 0x1;
1569 mos7840_port->DcrRegOffset = 0x4;
1570 } else {
1571 u8 phy_num = mos7840_port->port_num;
1572
1573 /* Port 2 in the 2-port case uses registers of port 3 */
1574 if (serial->num_ports == 2)
1575 phy_num = 3;
1576
1577 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
1578 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
1579 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
1580 }
1581 mos7840_dump_serial_port(port, mos7840_port);
1582 usb_set_serial_port_data(port, mos7840_port);
1583
1584 /* enable rx_disable bit in control register */
1585 status = mos7840_get_reg_sync(port,
1586 mos7840_port->ControlRegOffset, &Data);
1587 if (status < 0) {
1588 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
1589 goto error;
1590 } else
1591 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
1592 Data |= 0x08; /* setting driver done bit */
1593 Data |= 0x04; /* sp1_bit to have cts change reflect in
1594 modem status reg */
1595
1596 /* Data |= 0x20; //rx_disable bit */
1597 status = mos7840_set_reg_sync(port,
1598 mos7840_port->ControlRegOffset, Data);
1599 if (status < 0) {
1600 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
1601 goto error;
1602 } else
1603 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
1604
1605 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
1606 and 0x24 in DCR3 */
1607 Data = 0x01;
1608 status = mos7840_set_reg_sync(port,
1609 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
1610 if (status < 0) {
1611 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
1612 goto error;
1613 } else
1614 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
1615
1616 Data = 0x05;
1617 status = mos7840_set_reg_sync(port,
1618 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
1619 if (status < 0) {
1620 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
1621 goto error;
1622 } else
1623 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
1624
1625 Data = 0x24;
1626 status = mos7840_set_reg_sync(port,
1627 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
1628 if (status < 0) {
1629 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
1630 goto error;
1631 } else
1632 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
1633
1634 /* write values in clkstart0x0 and clkmulti 0x20 */
1635 Data = 0x0;
1636 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
1637 if (status < 0) {
1638 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
1639 goto error;
1640 } else
1641 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
1642
1643 Data = 0x20;
1644 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
1645 if (status < 0) {
1646 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
1647 goto error;
1648 } else
1649 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
1650
1651 /* write value 0x0 to scratchpad register */
1652 Data = 0x00;
1653 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
1654 if (status < 0) {
1655 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
1656 goto error;
1657 } else
1658 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
1659
1660 /* Zero Length flag register */
1661 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
1662 Data = 0xff;
1663 status = mos7840_set_reg_sync(port,
1664 (__u16) (ZLP_REG1 +
1665 ((__u16)mos7840_port->port_num)), Data);
1666 dev_dbg(&port->dev, "ZLIP offset %x\n",
1667 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
1668 if (status < 0) {
1669 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
1670 goto error;
1671 } else
1672 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
1673 } else {
1674 Data = 0xff;
1675 status = mos7840_set_reg_sync(port,
1676 (__u16) (ZLP_REG1 +
1677 ((__u16)mos7840_port->port_num) - 0x1), Data);
1678 dev_dbg(&port->dev, "ZLIP offset %x\n",
1679 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
1680 if (status < 0) {
1681 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
1682 goto error;
1683 } else
1684 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
1685
1686 }
1687
1688 mos7840_port->has_led = device_flags & MCS_LED;
1689
1690 /* Initialize LED timers */
1691 if (mos7840_port->has_led) {
1692 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
1693 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
1694 GFP_KERNEL);
1695 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
1696 status = -ENOMEM;
1697 goto error;
1698 }
1699
1700 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
1701 mos7840_port->led_timer1.expires =
1702 jiffies + msecs_to_jiffies(LED_ON_MS);
1703 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
1704 0);
1705 mos7840_port->led_timer2.expires =
1706 jiffies + msecs_to_jiffies(LED_OFF_MS);
1707
1708 /* Turn off LED */
1709 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1710 }
1711
1712 return 0;
1713error:
1714 kfree(mos7840_port->led_dr);
1715 usb_free_urb(mos7840_port->led_urb);
1716 kfree(mos7840_port);
1717
1718 return status;
1719}
1720
1721static void mos7840_port_remove(struct usb_serial_port *port)
1722{
1723 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1724
1725 if (mos7840_port->has_led) {
1726 /* Turn off LED */
1727 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1728
1729 timer_shutdown_sync(&mos7840_port->led_timer1);
1730 timer_shutdown_sync(&mos7840_port->led_timer2);
1731
1732 usb_kill_urb(mos7840_port->led_urb);
1733 usb_free_urb(mos7840_port->led_urb);
1734 kfree(mos7840_port->led_dr);
1735 }
1736
1737 kfree(mos7840_port);
1738}
1739
1740static struct usb_serial_driver moschip7840_4port_device = {
1741 .driver = {
1742 .owner = THIS_MODULE,
1743 .name = "mos7840",
1744 },
1745 .description = DRIVER_DESC,
1746 .id_table = id_table,
1747 .num_interrupt_in = 1,
1748 .open = mos7840_open,
1749 .close = mos7840_close,
1750 .write = mos7840_write,
1751 .write_room = mos7840_write_room,
1752 .chars_in_buffer = mos7840_chars_in_buffer,
1753 .throttle = mos7840_throttle,
1754 .unthrottle = mos7840_unthrottle,
1755 .calc_num_ports = mos7840_calc_num_ports,
1756 .probe = mos7840_probe,
1757 .attach = mos7840_attach,
1758 .ioctl = mos7840_ioctl,
1759 .set_termios = mos7840_set_termios,
1760 .break_ctl = mos7840_break,
1761 .tiocmget = mos7840_tiocmget,
1762 .tiocmset = mos7840_tiocmset,
1763 .get_icount = usb_serial_generic_get_icount,
1764 .port_probe = mos7840_port_probe,
1765 .port_remove = mos7840_port_remove,
1766 .read_bulk_callback = mos7840_bulk_in_callback,
1767};
1768
1769static struct usb_serial_driver * const serial_drivers[] = {
1770 &moschip7840_4port_device, NULL
1771};
1772
1773module_usb_serial_driver(serial_drivers, id_table);
1774
1775MODULE_DESCRIPTION(DRIVER_DESC);
1776MODULE_LICENSE("GPL");
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 *
23 */
24
25#include <linux/kernel.h>
26#include <linux/errno.h>
27#include <linux/slab.h>
28#include <linux/tty.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/module.h>
32#include <linux/serial.h>
33#include <linux/usb.h>
34#include <linux/usb/serial.h>
35#include <linux/uaccess.h>
36
37#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
38
39/*
40 * 16C50 UART register defines
41 */
42
43#define LCR_BITS_5 0x00 /* 5 bits/char */
44#define LCR_BITS_6 0x01 /* 6 bits/char */
45#define LCR_BITS_7 0x02 /* 7 bits/char */
46#define LCR_BITS_8 0x03 /* 8 bits/char */
47#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
48
49#define LCR_STOP_1 0x00 /* 1 stop bit */
50#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
51#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
52#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
53
54#define LCR_PAR_NONE 0x00 /* No parity */
55#define LCR_PAR_ODD 0x08 /* Odd parity */
56#define LCR_PAR_EVEN 0x18 /* Even parity */
57#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
58#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
59#define LCR_PAR_MASK 0x38 /* Mask for parity field */
60
61#define LCR_SET_BREAK 0x40 /* Set Break condition */
62#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
63
64#define MCR_DTR 0x01 /* Assert DTR */
65#define MCR_RTS 0x02 /* Assert RTS */
66#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
67#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
68#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
69#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
70
71#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
72#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
73#define MOS7840_MSR_RI 0x40 /* Current state of RI */
74#define MOS7840_MSR_CD 0x80 /* Current state of CD */
75
76/*
77 * Defines used for sending commands to port
78 */
79
80#define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
81
82#define MOS_PORT1 0x0200
83#define MOS_PORT2 0x0300
84#define MOS_VENREG 0x0000
85#define MOS_MAX_PORT 0x02
86#define MOS_WRITE 0x0E
87#define MOS_READ 0x0D
88
89/* Requests */
90#define MCS_RD_RTYPE 0xC0
91#define MCS_WR_RTYPE 0x40
92#define MCS_RDREQ 0x0D
93#define MCS_WRREQ 0x0E
94#define MCS_CTRL_TIMEOUT 500
95#define VENDOR_READ_LENGTH (0x01)
96
97#define MAX_NAME_LEN 64
98
99#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
100#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
101
102/* For higher baud Rates use TIOCEXBAUD */
103#define TIOCEXBAUD 0x5462
104
105/* vendor id and device id defines */
106
107/* The native mos7840/7820 component */
108#define USB_VENDOR_ID_MOSCHIP 0x9710
109#define MOSCHIP_DEVICE_ID_7840 0x7840
110#define MOSCHIP_DEVICE_ID_7820 0x7820
111#define MOSCHIP_DEVICE_ID_7810 0x7810
112/* The native component can have its vendor/device id's overridden
113 * in vendor-specific implementations. Such devices can be handled
114 * by making a change here, in id_table.
115 */
116#define USB_VENDOR_ID_BANDB 0x0856
117#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
118#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
119#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
120#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
121#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
122#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
123#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
124#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
125#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
126#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
127#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
128#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
129#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
130
131/* This driver also supports
132 * ATEN UC2324 device using Moschip MCS7840
133 * ATEN UC2322 device using Moschip MCS7820
134 */
135#define USB_VENDOR_ID_ATENINTL 0x0557
136#define ATENINTL_DEVICE_ID_UC2324 0x2011
137#define ATENINTL_DEVICE_ID_UC2322 0x7820
138
139/* Interrupt Routine Defines */
140
141#define SERIAL_IIR_RLS 0x06
142#define SERIAL_IIR_MS 0x00
143
144/*
145 * Emulation of the bit mask on the LINE STATUS REGISTER.
146 */
147#define SERIAL_LSR_DR 0x0001
148#define SERIAL_LSR_OE 0x0002
149#define SERIAL_LSR_PE 0x0004
150#define SERIAL_LSR_FE 0x0008
151#define SERIAL_LSR_BI 0x0010
152
153#define MOS_MSR_DELTA_CTS 0x10
154#define MOS_MSR_DELTA_DSR 0x20
155#define MOS_MSR_DELTA_RI 0x40
156#define MOS_MSR_DELTA_CD 0x80
157
158/* Serial Port register Address */
159#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
160#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
161#define LINE_CONTROL_REGISTER ((__u16)(0x03))
162#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
163#define LINE_STATUS_REGISTER ((__u16)(0x05))
164#define MODEM_STATUS_REGISTER ((__u16)(0x06))
165#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
166#define DIVISOR_LATCH_LSB ((__u16)(0x00))
167#define DIVISOR_LATCH_MSB ((__u16)(0x01))
168
169#define CLK_MULTI_REGISTER ((__u16)(0x02))
170#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
171#define GPIO_REGISTER ((__u16)(0x07))
172
173#define SERIAL_LCR_DLAB ((__u16)(0x0080))
174
175/*
176 * URB POOL related defines
177 */
178#define NUM_URBS 16 /* URB Count */
179#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
180
181/* LED on/off milliseconds*/
182#define LED_ON_MS 500
183#define LED_OFF_MS 500
184
185enum mos7840_flag {
186 MOS7840_FLAG_CTRL_BUSY,
187 MOS7840_FLAG_LED_BUSY,
188};
189
190static const struct usb_device_id id_table[] = {
191 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
192 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
193 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
205 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
206 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
207 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
208 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
209 {} /* terminating entry */
210};
211MODULE_DEVICE_TABLE(usb, id_table);
212
213/* This structure holds all of the local port information */
214
215struct moschip_port {
216 int port_num; /*Actual port number in the device(1,2,etc) */
217 struct urb *read_urb; /* read URB for this port */
218 __u8 shadowLCR; /* last LCR value received */
219 __u8 shadowMCR; /* last MCR value received */
220 char open;
221 char open_ports;
222 struct usb_serial_port *port; /* loop back to the owner of this object */
223
224 /* Offsets */
225 __u8 SpRegOffset;
226 __u8 ControlRegOffset;
227 __u8 DcrRegOffset;
228 /* for processing control URBS in interrupt context */
229 struct urb *control_urb;
230 struct usb_ctrlrequest *dr;
231 char *ctrl_buf;
232 int MsrLsr;
233
234 spinlock_t pool_lock;
235 struct urb *write_urb_pool[NUM_URBS];
236 char busy[NUM_URBS];
237 bool read_urb_busy;
238
239 /* For device(s) with LED indicator */
240 bool has_led;
241 struct timer_list led_timer1; /* Timer for LED on */
242 struct timer_list led_timer2; /* Timer for LED off */
243 struct urb *led_urb;
244 struct usb_ctrlrequest *led_dr;
245
246 unsigned long flags;
247};
248
249/*
250 * mos7840_set_reg_sync
251 * To set the Control register by calling usb_fill_control_urb function
252 * by passing usb_sndctrlpipe function as parameter.
253 */
254
255static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
256 __u16 val)
257{
258 struct usb_device *dev = port->serial->dev;
259 val = val & 0x00ff;
260 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
261
262 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
263 MCS_WR_RTYPE, val, reg, NULL, 0,
264 MOS_WDR_TIMEOUT);
265}
266
267/*
268 * mos7840_get_reg_sync
269 * To set the Uart register by calling usb_fill_control_urb function by
270 * passing usb_rcvctrlpipe function as parameter.
271 */
272
273static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
274 __u16 *val)
275{
276 struct usb_device *dev = port->serial->dev;
277 int ret = 0;
278 u8 *buf;
279
280 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
281 if (!buf)
282 return -ENOMEM;
283
284 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
285 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
286 MOS_WDR_TIMEOUT);
287 *val = buf[0];
288 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
289
290 kfree(buf);
291 return ret;
292}
293
294/*
295 * mos7840_set_uart_reg
296 * To set the Uart register by calling usb_fill_control_urb function by
297 * passing usb_sndctrlpipe function as parameter.
298 */
299
300static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
301 __u16 val)
302{
303
304 struct usb_device *dev = port->serial->dev;
305 val = val & 0x00ff;
306 /* For the UART control registers, the application number need
307 to be Or'ed */
308 if (port->serial->num_ports == 4) {
309 val |= ((__u16)port->port_number + 1) << 8;
310 } else {
311 if (port->port_number == 0) {
312 val |= ((__u16)port->port_number + 1) << 8;
313 } else {
314 val |= ((__u16)port->port_number + 2) << 8;
315 }
316 }
317 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
318 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
319 MCS_WR_RTYPE, val, reg, NULL, 0,
320 MOS_WDR_TIMEOUT);
321
322}
323
324/*
325 * mos7840_get_uart_reg
326 * To set the Control register by calling usb_fill_control_urb function
327 * by passing usb_rcvctrlpipe function as parameter.
328 */
329static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
330 __u16 *val)
331{
332 struct usb_device *dev = port->serial->dev;
333 int ret = 0;
334 __u16 Wval;
335 u8 *buf;
336
337 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
338 if (!buf)
339 return -ENOMEM;
340
341 /* Wval is same as application number */
342 if (port->serial->num_ports == 4) {
343 Wval = ((__u16)port->port_number + 1) << 8;
344 } else {
345 if (port->port_number == 0) {
346 Wval = ((__u16)port->port_number + 1) << 8;
347 } else {
348 Wval = ((__u16)port->port_number + 2) << 8;
349 }
350 }
351 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
352 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
353 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
354 MOS_WDR_TIMEOUT);
355 *val = buf[0];
356
357 kfree(buf);
358 return ret;
359}
360
361static void mos7840_dump_serial_port(struct usb_serial_port *port,
362 struct moschip_port *mos7840_port)
363{
364
365 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
366 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
367 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
368
369}
370
371/************************************************************************/
372/************************************************************************/
373/* I N T E R F A C E F U N C T I O N S */
374/* I N T E R F A C E F U N C T I O N S */
375/************************************************************************/
376/************************************************************************/
377
378static inline void mos7840_set_port_private(struct usb_serial_port *port,
379 struct moschip_port *data)
380{
381 usb_set_serial_port_data(port, (void *)data);
382}
383
384static inline struct moschip_port *mos7840_get_port_private(struct
385 usb_serial_port
386 *port)
387{
388 return (struct moschip_port *)usb_get_serial_port_data(port);
389}
390
391static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
392{
393 struct moschip_port *mos7840_port;
394 struct async_icount *icount;
395 mos7840_port = port;
396 if (new_msr &
397 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
398 MOS_MSR_DELTA_CD)) {
399 icount = &mos7840_port->port->icount;
400
401 /* update input line counters */
402 if (new_msr & MOS_MSR_DELTA_CTS)
403 icount->cts++;
404 if (new_msr & MOS_MSR_DELTA_DSR)
405 icount->dsr++;
406 if (new_msr & MOS_MSR_DELTA_CD)
407 icount->dcd++;
408 if (new_msr & MOS_MSR_DELTA_RI)
409 icount->rng++;
410
411 wake_up_interruptible(&port->port->port.delta_msr_wait);
412 }
413}
414
415static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
416{
417 struct async_icount *icount;
418
419 if (new_lsr & SERIAL_LSR_BI) {
420 /*
421 * Parity and Framing errors only count if they
422 * occur exclusive of a break being
423 * received.
424 */
425 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
426 }
427
428 /* update input line counters */
429 icount = &port->port->icount;
430 if (new_lsr & SERIAL_LSR_BI)
431 icount->brk++;
432 if (new_lsr & SERIAL_LSR_OE)
433 icount->overrun++;
434 if (new_lsr & SERIAL_LSR_PE)
435 icount->parity++;
436 if (new_lsr & SERIAL_LSR_FE)
437 icount->frame++;
438}
439
440/************************************************************************/
441/************************************************************************/
442/* U S B C A L L B A C K F U N C T I O N S */
443/* U S B C A L L B A C K F U N C T I O N S */
444/************************************************************************/
445/************************************************************************/
446
447static void mos7840_control_callback(struct urb *urb)
448{
449 unsigned char *data;
450 struct moschip_port *mos7840_port;
451 struct device *dev = &urb->dev->dev;
452 __u8 regval = 0x0;
453 int status = urb->status;
454
455 mos7840_port = urb->context;
456
457 switch (status) {
458 case 0:
459 /* success */
460 break;
461 case -ECONNRESET:
462 case -ENOENT:
463 case -ESHUTDOWN:
464 /* this urb is terminated, clean up */
465 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
466 goto out;
467 default:
468 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
469 goto out;
470 }
471
472 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
473 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
474 mos7840_port->MsrLsr, mos7840_port->port_num);
475 data = urb->transfer_buffer;
476 regval = (__u8) data[0];
477 dev_dbg(dev, "%s data is %x\n", __func__, regval);
478 if (mos7840_port->MsrLsr == 0)
479 mos7840_handle_new_msr(mos7840_port, regval);
480 else if (mos7840_port->MsrLsr == 1)
481 mos7840_handle_new_lsr(mos7840_port, regval);
482out:
483 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
484}
485
486static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
487 __u16 *val)
488{
489 struct usb_device *dev = mcs->port->serial->dev;
490 struct usb_ctrlrequest *dr = mcs->dr;
491 unsigned char *buffer = mcs->ctrl_buf;
492 int ret;
493
494 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
495 return -EBUSY;
496
497 dr->bRequestType = MCS_RD_RTYPE;
498 dr->bRequest = MCS_RDREQ;
499 dr->wValue = cpu_to_le16(Wval); /* 0 */
500 dr->wIndex = cpu_to_le16(reg);
501 dr->wLength = cpu_to_le16(2);
502
503 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
504 (unsigned char *)dr, buffer, 2,
505 mos7840_control_callback, mcs);
506 mcs->control_urb->transfer_buffer_length = 2;
507 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
508 if (ret)
509 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
510
511 return ret;
512}
513
514static void mos7840_set_led_callback(struct urb *urb)
515{
516 switch (urb->status) {
517 case 0:
518 /* Success */
519 break;
520 case -ECONNRESET:
521 case -ENOENT:
522 case -ESHUTDOWN:
523 /* This urb is terminated, clean up */
524 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
525 __func__, urb->status);
526 break;
527 default:
528 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
529 __func__, urb->status);
530 }
531}
532
533static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
534 __u16 reg)
535{
536 struct usb_device *dev = mcs->port->serial->dev;
537 struct usb_ctrlrequest *dr = mcs->led_dr;
538
539 dr->bRequestType = MCS_WR_RTYPE;
540 dr->bRequest = MCS_WRREQ;
541 dr->wValue = cpu_to_le16(wval);
542 dr->wIndex = cpu_to_le16(reg);
543 dr->wLength = cpu_to_le16(0);
544
545 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
546 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
547
548 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
549}
550
551static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
552 __u16 val)
553{
554 struct usb_device *dev = port->serial->dev;
555
556 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
557 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
558}
559
560static void mos7840_led_off(unsigned long arg)
561{
562 struct moschip_port *mcs = (struct moschip_port *) arg;
563
564 /* Turn off LED */
565 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
566 mod_timer(&mcs->led_timer2,
567 jiffies + msecs_to_jiffies(LED_OFF_MS));
568}
569
570static void mos7840_led_flag_off(unsigned long arg)
571{
572 struct moschip_port *mcs = (struct moschip_port *) arg;
573
574 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
575}
576
577static void mos7840_led_activity(struct usb_serial_port *port)
578{
579 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
580
581 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
582 return;
583
584 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
585 mod_timer(&mos7840_port->led_timer1,
586 jiffies + msecs_to_jiffies(LED_ON_MS));
587}
588
589/*****************************************************************************
590 * mos7840_interrupt_callback
591 * this is the callback function for when we have received data on the
592 * interrupt endpoint.
593 *****************************************************************************/
594
595static void mos7840_interrupt_callback(struct urb *urb)
596{
597 int result;
598 int length;
599 struct moschip_port *mos7840_port;
600 struct usb_serial *serial;
601 __u16 Data;
602 unsigned char *data;
603 __u8 sp[5], st;
604 int i, rv = 0;
605 __u16 wval, wreg = 0;
606 int status = urb->status;
607
608 switch (status) {
609 case 0:
610 /* success */
611 break;
612 case -ECONNRESET:
613 case -ENOENT:
614 case -ESHUTDOWN:
615 /* this urb is terminated, clean up */
616 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
617 __func__, status);
618 return;
619 default:
620 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
621 __func__, status);
622 goto exit;
623 }
624
625 length = urb->actual_length;
626 data = urb->transfer_buffer;
627
628 serial = urb->context;
629
630 /* Moschip get 5 bytes
631 * Byte 1 IIR Port 1 (port.number is 0)
632 * Byte 2 IIR Port 2 (port.number is 1)
633 * Byte 3 IIR Port 3 (port.number is 2)
634 * Byte 4 IIR Port 4 (port.number is 3)
635 * Byte 5 FIFO status for both */
636
637 if (length > 5) {
638 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
639 return;
640 }
641
642 sp[0] = (__u8) data[0];
643 sp[1] = (__u8) data[1];
644 sp[2] = (__u8) data[2];
645 sp[3] = (__u8) data[3];
646 st = (__u8) data[4];
647
648 for (i = 0; i < serial->num_ports; i++) {
649 mos7840_port = mos7840_get_port_private(serial->port[i]);
650 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
651 if (mos7840_port->open) {
652 if (sp[i] & 0x01) {
653 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
654 } else {
655 switch (sp[i] & 0x0f) {
656 case SERIAL_IIR_RLS:
657 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
658 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
659 mos7840_port->MsrLsr = 1;
660 wreg = LINE_STATUS_REGISTER;
661 break;
662 case SERIAL_IIR_MS:
663 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
664 mos7840_port->MsrLsr = 0;
665 wreg = MODEM_STATUS_REGISTER;
666 break;
667 }
668 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
669 }
670 }
671 }
672 if (!(rv < 0))
673 /* the completion handler for the control urb will resubmit */
674 return;
675exit:
676 result = usb_submit_urb(urb, GFP_ATOMIC);
677 if (result) {
678 dev_err(&urb->dev->dev,
679 "%s - Error %d submitting interrupt urb\n",
680 __func__, result);
681 }
682}
683
684static int mos7840_port_paranoia_check(struct usb_serial_port *port,
685 const char *function)
686{
687 if (!port) {
688 pr_debug("%s - port == NULL\n", function);
689 return -1;
690 }
691 if (!port->serial) {
692 pr_debug("%s - port->serial == NULL\n", function);
693 return -1;
694 }
695
696 return 0;
697}
698
699/* Inline functions to check the sanity of a pointer that is passed to us */
700static int mos7840_serial_paranoia_check(struct usb_serial *serial,
701 const char *function)
702{
703 if (!serial) {
704 pr_debug("%s - serial == NULL\n", function);
705 return -1;
706 }
707 if (!serial->type) {
708 pr_debug("%s - serial->type == NULL!\n", function);
709 return -1;
710 }
711
712 return 0;
713}
714
715static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
716 const char *function)
717{
718 /* if no port was specified, or it fails a paranoia check */
719 if (!port ||
720 mos7840_port_paranoia_check(port, function) ||
721 mos7840_serial_paranoia_check(port->serial, function)) {
722 /* then say that we don't have a valid usb_serial thing,
723 * which will end up genrating -ENODEV return values */
724 return NULL;
725 }
726
727 return port->serial;
728}
729
730/*****************************************************************************
731 * mos7840_bulk_in_callback
732 * this is the callback function for when we have received data on the
733 * bulk in endpoint.
734 *****************************************************************************/
735
736static void mos7840_bulk_in_callback(struct urb *urb)
737{
738 int retval;
739 unsigned char *data;
740 struct usb_serial *serial;
741 struct usb_serial_port *port;
742 struct moschip_port *mos7840_port;
743 int status = urb->status;
744
745 mos7840_port = urb->context;
746 if (!mos7840_port)
747 return;
748
749 if (status) {
750 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
751 mos7840_port->read_urb_busy = false;
752 return;
753 }
754
755 port = mos7840_port->port;
756 if (mos7840_port_paranoia_check(port, __func__)) {
757 mos7840_port->read_urb_busy = false;
758 return;
759 }
760
761 serial = mos7840_get_usb_serial(port, __func__);
762 if (!serial) {
763 mos7840_port->read_urb_busy = false;
764 return;
765 }
766
767 data = urb->transfer_buffer;
768 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
769
770 if (urb->actual_length) {
771 struct tty_port *tport = &mos7840_port->port->port;
772 tty_insert_flip_string(tport, data, urb->actual_length);
773 tty_flip_buffer_push(tport);
774 port->icount.rx += urb->actual_length;
775 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
776 }
777
778 if (!mos7840_port->read_urb) {
779 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
780 mos7840_port->read_urb_busy = false;
781 return;
782 }
783
784 if (mos7840_port->has_led)
785 mos7840_led_activity(port);
786
787 mos7840_port->read_urb_busy = true;
788 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
789
790 if (retval) {
791 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
792 mos7840_port->read_urb_busy = false;
793 }
794}
795
796/*****************************************************************************
797 * mos7840_bulk_out_data_callback
798 * this is the callback function for when we have finished sending
799 * serial data on the bulk out endpoint.
800 *****************************************************************************/
801
802static void mos7840_bulk_out_data_callback(struct urb *urb)
803{
804 struct moschip_port *mos7840_port;
805 struct usb_serial_port *port;
806 int status = urb->status;
807 int i;
808
809 mos7840_port = urb->context;
810 port = mos7840_port->port;
811 spin_lock(&mos7840_port->pool_lock);
812 for (i = 0; i < NUM_URBS; i++) {
813 if (urb == mos7840_port->write_urb_pool[i]) {
814 mos7840_port->busy[i] = 0;
815 break;
816 }
817 }
818 spin_unlock(&mos7840_port->pool_lock);
819
820 if (status) {
821 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
822 return;
823 }
824
825 if (mos7840_port_paranoia_check(port, __func__))
826 return;
827
828 if (mos7840_port->open)
829 tty_port_tty_wakeup(&port->port);
830
831}
832
833/************************************************************************/
834/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
835/************************************************************************/
836
837/*****************************************************************************
838 * mos7840_open
839 * this function is called by the tty driver when a port is opened
840 * If successful, we return 0
841 * Otherwise we return a negative error number.
842 *****************************************************************************/
843
844static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
845{
846 int response;
847 int j;
848 struct usb_serial *serial;
849 struct urb *urb;
850 __u16 Data;
851 int status;
852 struct moschip_port *mos7840_port;
853 struct moschip_port *port0;
854
855 if (mos7840_port_paranoia_check(port, __func__))
856 return -ENODEV;
857
858 serial = port->serial;
859
860 if (mos7840_serial_paranoia_check(serial, __func__))
861 return -ENODEV;
862
863 mos7840_port = mos7840_get_port_private(port);
864 port0 = mos7840_get_port_private(serial->port[0]);
865
866 if (mos7840_port == NULL || port0 == NULL)
867 return -ENODEV;
868
869 usb_clear_halt(serial->dev, port->write_urb->pipe);
870 usb_clear_halt(serial->dev, port->read_urb->pipe);
871 port0->open_ports++;
872
873 /* Initialising the write urb pool */
874 for (j = 0; j < NUM_URBS; ++j) {
875 urb = usb_alloc_urb(0, GFP_KERNEL);
876 mos7840_port->write_urb_pool[j] = urb;
877 if (!urb)
878 continue;
879
880 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
881 GFP_KERNEL);
882 if (!urb->transfer_buffer) {
883 usb_free_urb(urb);
884 mos7840_port->write_urb_pool[j] = NULL;
885 continue;
886 }
887 }
888
889/*****************************************************************************
890 * Initialize MCS7840 -- Write Init values to corresponding Registers
891 *
892 * Register Index
893 * 1 : IER
894 * 2 : FCR
895 * 3 : LCR
896 * 4 : MCR
897 *
898 * 0x08 : SP1/2 Control Reg
899 *****************************************************************************/
900
901 /* NEED to check the following Block */
902
903 Data = 0x0;
904 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
905 if (status < 0) {
906 dev_dbg(&port->dev, "Reading Spreg failed\n");
907 goto err;
908 }
909 Data |= 0x80;
910 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
911 if (status < 0) {
912 dev_dbg(&port->dev, "writing Spreg failed\n");
913 goto err;
914 }
915
916 Data &= ~0x80;
917 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
918 if (status < 0) {
919 dev_dbg(&port->dev, "writing Spreg failed\n");
920 goto err;
921 }
922 /* End of block to be checked */
923
924 Data = 0x0;
925 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
926 &Data);
927 if (status < 0) {
928 dev_dbg(&port->dev, "Reading Controlreg failed\n");
929 goto err;
930 }
931 Data |= 0x08; /* Driver done bit */
932 Data |= 0x20; /* rx_disable */
933 status = mos7840_set_reg_sync(port,
934 mos7840_port->ControlRegOffset, Data);
935 if (status < 0) {
936 dev_dbg(&port->dev, "writing Controlreg failed\n");
937 goto err;
938 }
939 /* do register settings here */
940 /* Set all regs to the device default values. */
941 /***********************************
942 * First Disable all interrupts.
943 ***********************************/
944 Data = 0x00;
945 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
946 if (status < 0) {
947 dev_dbg(&port->dev, "disabling interrupts failed\n");
948 goto err;
949 }
950 /* Set FIFO_CONTROL_REGISTER to the default value */
951 Data = 0x00;
952 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
953 if (status < 0) {
954 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
955 goto err;
956 }
957
958 Data = 0xcf;
959 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
960 if (status < 0) {
961 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
962 goto err;
963 }
964
965 Data = 0x03;
966 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
967 mos7840_port->shadowLCR = Data;
968
969 Data = 0x0b;
970 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
971 mos7840_port->shadowMCR = Data;
972
973 Data = 0x00;
974 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
975 mos7840_port->shadowLCR = Data;
976
977 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
978 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
979
980 Data = 0x0c;
981 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
982
983 Data = 0x0;
984 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
985
986 Data = 0x00;
987 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
988
989 Data = Data & ~SERIAL_LCR_DLAB;
990 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
991 mos7840_port->shadowLCR = Data;
992
993 /* clearing Bulkin and Bulkout Fifo */
994 Data = 0x0;
995 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
996
997 Data = Data | 0x0c;
998 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
999
1000 Data = Data & ~0x0c;
1001 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1002 /* Finally enable all interrupts */
1003 Data = 0x0c;
1004 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1005
1006 /* clearing rx_disable */
1007 Data = 0x0;
1008 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1009 &Data);
1010 Data = Data & ~0x20;
1011 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1012 Data);
1013
1014 /* rx_negate */
1015 Data = 0x0;
1016 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1017 &Data);
1018 Data = Data | 0x10;
1019 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1020 Data);
1021
1022 /* Check to see if we've set up our endpoint info yet *
1023 * (can't set it up in mos7840_startup as the structures *
1024 * were not set up at that time.) */
1025 if (port0->open_ports == 1) {
1026 /* FIXME: Buffer never NULL, so URB is not submitted. */
1027 if (serial->port[0]->interrupt_in_buffer == NULL) {
1028 /* set up interrupt urb */
1029 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1030 serial->dev,
1031 usb_rcvintpipe(serial->dev,
1032 serial->port[0]->interrupt_in_endpointAddress),
1033 serial->port[0]->interrupt_in_buffer,
1034 serial->port[0]->interrupt_in_urb->
1035 transfer_buffer_length,
1036 mos7840_interrupt_callback,
1037 serial,
1038 serial->port[0]->interrupt_in_urb->interval);
1039
1040 /* start interrupt read for mos7840 */
1041 response =
1042 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1043 GFP_KERNEL);
1044 if (response) {
1045 dev_err(&port->dev, "%s - Error %d submitting "
1046 "interrupt urb\n", __func__, response);
1047 }
1048
1049 }
1050
1051 }
1052
1053 /* see if we've set up our endpoint info yet *
1054 * (can't set it up in mos7840_startup as the *
1055 * structures were not set up at that time.) */
1056
1057 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1058 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1059 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1060 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1061 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1062 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1063 mos7840_port->read_urb = port->read_urb;
1064
1065 /* set up our bulk in urb */
1066 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1067 usb_fill_bulk_urb(mos7840_port->read_urb,
1068 serial->dev,
1069 usb_rcvbulkpipe(serial->dev,
1070 (port->bulk_in_endpointAddress) + 2),
1071 port->bulk_in_buffer,
1072 mos7840_port->read_urb->transfer_buffer_length,
1073 mos7840_bulk_in_callback, mos7840_port);
1074 } else {
1075 usb_fill_bulk_urb(mos7840_port->read_urb,
1076 serial->dev,
1077 usb_rcvbulkpipe(serial->dev,
1078 port->bulk_in_endpointAddress),
1079 port->bulk_in_buffer,
1080 mos7840_port->read_urb->transfer_buffer_length,
1081 mos7840_bulk_in_callback, mos7840_port);
1082 }
1083
1084 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1085 mos7840_port->read_urb_busy = true;
1086 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1087 if (response) {
1088 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1089 __func__, response);
1090 mos7840_port->read_urb_busy = false;
1091 }
1092
1093 /* initialize our port settings */
1094 /* Must set to enable ints! */
1095 mos7840_port->shadowMCR = MCR_MASTER_IE;
1096 /* send a open port command */
1097 mos7840_port->open = 1;
1098 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1099
1100 return 0;
1101err:
1102 for (j = 0; j < NUM_URBS; ++j) {
1103 urb = mos7840_port->write_urb_pool[j];
1104 if (!urb)
1105 continue;
1106 kfree(urb->transfer_buffer);
1107 usb_free_urb(urb);
1108 }
1109 return status;
1110}
1111
1112/*****************************************************************************
1113 * mos7840_chars_in_buffer
1114 * this function is called by the tty driver when it wants to know how many
1115 * bytes of data we currently have outstanding in the port (data that has
1116 * been written, but hasn't made it out the port yet)
1117 * If successful, we return the number of bytes left to be written in the
1118 * system,
1119 * Otherwise we return zero.
1120 *****************************************************************************/
1121
1122static int mos7840_chars_in_buffer(struct tty_struct *tty)
1123{
1124 struct usb_serial_port *port = tty->driver_data;
1125 int i;
1126 int chars = 0;
1127 unsigned long flags;
1128 struct moschip_port *mos7840_port;
1129
1130 if (mos7840_port_paranoia_check(port, __func__))
1131 return 0;
1132
1133 mos7840_port = mos7840_get_port_private(port);
1134 if (mos7840_port == NULL)
1135 return 0;
1136
1137 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1138 for (i = 0; i < NUM_URBS; ++i) {
1139 if (mos7840_port->busy[i]) {
1140 struct urb *urb = mos7840_port->write_urb_pool[i];
1141 chars += urb->transfer_buffer_length;
1142 }
1143 }
1144 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1145 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1146 return chars;
1147
1148}
1149
1150/*****************************************************************************
1151 * mos7840_close
1152 * this function is called by the tty driver when a port is closed
1153 *****************************************************************************/
1154
1155static void mos7840_close(struct usb_serial_port *port)
1156{
1157 struct usb_serial *serial;
1158 struct moschip_port *mos7840_port;
1159 struct moschip_port *port0;
1160 int j;
1161 __u16 Data;
1162
1163 if (mos7840_port_paranoia_check(port, __func__))
1164 return;
1165
1166 serial = mos7840_get_usb_serial(port, __func__);
1167 if (!serial)
1168 return;
1169
1170 mos7840_port = mos7840_get_port_private(port);
1171 port0 = mos7840_get_port_private(serial->port[0]);
1172
1173 if (mos7840_port == NULL || port0 == NULL)
1174 return;
1175
1176 for (j = 0; j < NUM_URBS; ++j)
1177 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1178
1179 /* Freeing Write URBs */
1180 for (j = 0; j < NUM_URBS; ++j) {
1181 if (mos7840_port->write_urb_pool[j]) {
1182 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1183 usb_free_urb(mos7840_port->write_urb_pool[j]);
1184 }
1185 }
1186
1187 usb_kill_urb(mos7840_port->read_urb);
1188 mos7840_port->read_urb_busy = false;
1189
1190 port0->open_ports--;
1191 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1192 if (port0->open_ports == 0) {
1193 if (serial->port[0]->interrupt_in_urb) {
1194 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1195 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1196 }
1197 }
1198
1199 Data = 0x0;
1200 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1201
1202 Data = 0x00;
1203 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1204
1205 mos7840_port->open = 0;
1206}
1207
1208/*****************************************************************************
1209 * mos7840_break
1210 * this function sends a break to the port
1211 *****************************************************************************/
1212static void mos7840_break(struct tty_struct *tty, int break_state)
1213{
1214 struct usb_serial_port *port = tty->driver_data;
1215 unsigned char data;
1216 struct usb_serial *serial;
1217 struct moschip_port *mos7840_port;
1218
1219 if (mos7840_port_paranoia_check(port, __func__))
1220 return;
1221
1222 serial = mos7840_get_usb_serial(port, __func__);
1223 if (!serial)
1224 return;
1225
1226 mos7840_port = mos7840_get_port_private(port);
1227
1228 if (mos7840_port == NULL)
1229 return;
1230
1231 if (break_state == -1)
1232 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1233 else
1234 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1235
1236 /* FIXME: no locking on shadowLCR anywhere in driver */
1237 mos7840_port->shadowLCR = data;
1238 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1239 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1240 mos7840_port->shadowLCR);
1241}
1242
1243/*****************************************************************************
1244 * mos7840_write_room
1245 * this function is called by the tty driver when it wants to know how many
1246 * bytes of data we can accept for a specific port.
1247 * If successful, we return the amount of room that we have for this port
1248 * Otherwise we return a negative error number.
1249 *****************************************************************************/
1250
1251static int mos7840_write_room(struct tty_struct *tty)
1252{
1253 struct usb_serial_port *port = tty->driver_data;
1254 int i;
1255 int room = 0;
1256 unsigned long flags;
1257 struct moschip_port *mos7840_port;
1258
1259 if (mos7840_port_paranoia_check(port, __func__))
1260 return -1;
1261
1262 mos7840_port = mos7840_get_port_private(port);
1263 if (mos7840_port == NULL)
1264 return -1;
1265
1266 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1267 for (i = 0; i < NUM_URBS; ++i) {
1268 if (!mos7840_port->busy[i])
1269 room += URB_TRANSFER_BUFFER_SIZE;
1270 }
1271 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1272
1273 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1274 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1275 return room;
1276
1277}
1278
1279/*****************************************************************************
1280 * mos7840_write
1281 * this function is called by the tty driver when data should be written to
1282 * the port.
1283 * If successful, we return the number of bytes written, otherwise we
1284 * return a negative error number.
1285 *****************************************************************************/
1286
1287static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1288 const unsigned char *data, int count)
1289{
1290 int status;
1291 int i;
1292 int bytes_sent = 0;
1293 int transfer_size;
1294 unsigned long flags;
1295
1296 struct moschip_port *mos7840_port;
1297 struct usb_serial *serial;
1298 struct urb *urb;
1299 /* __u16 Data; */
1300 const unsigned char *current_position = data;
1301 unsigned char *data1;
1302
1303 if (mos7840_port_paranoia_check(port, __func__))
1304 return -1;
1305
1306 serial = port->serial;
1307 if (mos7840_serial_paranoia_check(serial, __func__))
1308 return -1;
1309
1310 mos7840_port = mos7840_get_port_private(port);
1311 if (mos7840_port == NULL)
1312 return -1;
1313
1314 /* try to find a free urb in the list */
1315 urb = NULL;
1316
1317 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1318 for (i = 0; i < NUM_URBS; ++i) {
1319 if (!mos7840_port->busy[i]) {
1320 mos7840_port->busy[i] = 1;
1321 urb = mos7840_port->write_urb_pool[i];
1322 dev_dbg(&port->dev, "URB:%d\n", i);
1323 break;
1324 }
1325 }
1326 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1327
1328 if (urb == NULL) {
1329 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1330 goto exit;
1331 }
1332
1333 if (urb->transfer_buffer == NULL) {
1334 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1335 GFP_ATOMIC);
1336 if (!urb->transfer_buffer)
1337 goto exit;
1338 }
1339 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1340
1341 memcpy(urb->transfer_buffer, current_position, transfer_size);
1342
1343 /* fill urb with data and submit */
1344 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1345 usb_fill_bulk_urb(urb,
1346 serial->dev,
1347 usb_sndbulkpipe(serial->dev,
1348 (port->bulk_out_endpointAddress) + 2),
1349 urb->transfer_buffer,
1350 transfer_size,
1351 mos7840_bulk_out_data_callback, mos7840_port);
1352 } else {
1353 usb_fill_bulk_urb(urb,
1354 serial->dev,
1355 usb_sndbulkpipe(serial->dev,
1356 port->bulk_out_endpointAddress),
1357 urb->transfer_buffer,
1358 transfer_size,
1359 mos7840_bulk_out_data_callback, mos7840_port);
1360 }
1361
1362 data1 = urb->transfer_buffer;
1363 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1364
1365 if (mos7840_port->has_led)
1366 mos7840_led_activity(port);
1367
1368 /* send it down the pipe */
1369 status = usb_submit_urb(urb, GFP_ATOMIC);
1370
1371 if (status) {
1372 mos7840_port->busy[i] = 0;
1373 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1374 "with status = %d\n", __func__, status);
1375 bytes_sent = status;
1376 goto exit;
1377 }
1378 bytes_sent = transfer_size;
1379 port->icount.tx += transfer_size;
1380 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1381exit:
1382 return bytes_sent;
1383
1384}
1385
1386/*****************************************************************************
1387 * mos7840_throttle
1388 * this function is called by the tty driver when it wants to stop the data
1389 * being read from the port.
1390 *****************************************************************************/
1391
1392static void mos7840_throttle(struct tty_struct *tty)
1393{
1394 struct usb_serial_port *port = tty->driver_data;
1395 struct moschip_port *mos7840_port;
1396 int status;
1397
1398 if (mos7840_port_paranoia_check(port, __func__))
1399 return;
1400
1401 mos7840_port = mos7840_get_port_private(port);
1402
1403 if (mos7840_port == NULL)
1404 return;
1405
1406 if (!mos7840_port->open) {
1407 dev_dbg(&port->dev, "%s", "port not opened\n");
1408 return;
1409 }
1410
1411 /* if we are implementing XON/XOFF, send the stop character */
1412 if (I_IXOFF(tty)) {
1413 unsigned char stop_char = STOP_CHAR(tty);
1414 status = mos7840_write(tty, port, &stop_char, 1);
1415 if (status <= 0)
1416 return;
1417 }
1418 /* if we are implementing RTS/CTS, toggle that line */
1419 if (C_CRTSCTS(tty)) {
1420 mos7840_port->shadowMCR &= ~MCR_RTS;
1421 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1422 mos7840_port->shadowMCR);
1423 if (status < 0)
1424 return;
1425 }
1426}
1427
1428/*****************************************************************************
1429 * mos7840_unthrottle
1430 * this function is called by the tty driver when it wants to resume
1431 * the data being read from the port (called after mos7840_throttle is
1432 * called)
1433 *****************************************************************************/
1434static void mos7840_unthrottle(struct tty_struct *tty)
1435{
1436 struct usb_serial_port *port = tty->driver_data;
1437 int status;
1438 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1439
1440 if (mos7840_port_paranoia_check(port, __func__))
1441 return;
1442
1443 if (mos7840_port == NULL)
1444 return;
1445
1446 if (!mos7840_port->open) {
1447 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1448 return;
1449 }
1450
1451 /* if we are implementing XON/XOFF, send the start character */
1452 if (I_IXOFF(tty)) {
1453 unsigned char start_char = START_CHAR(tty);
1454 status = mos7840_write(tty, port, &start_char, 1);
1455 if (status <= 0)
1456 return;
1457 }
1458
1459 /* if we are implementing RTS/CTS, toggle that line */
1460 if (C_CRTSCTS(tty)) {
1461 mos7840_port->shadowMCR |= MCR_RTS;
1462 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1463 mos7840_port->shadowMCR);
1464 if (status < 0)
1465 return;
1466 }
1467}
1468
1469static int mos7840_tiocmget(struct tty_struct *tty)
1470{
1471 struct usb_serial_port *port = tty->driver_data;
1472 struct moschip_port *mos7840_port;
1473 unsigned int result;
1474 __u16 msr;
1475 __u16 mcr;
1476 int status;
1477 mos7840_port = mos7840_get_port_private(port);
1478
1479 if (mos7840_port == NULL)
1480 return -ENODEV;
1481
1482 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1483 if (status != 1)
1484 return -EIO;
1485 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1486 if (status != 1)
1487 return -EIO;
1488 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1489 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1490 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1491 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1492 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1493 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1494 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1495
1496 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1497
1498 return result;
1499}
1500
1501static int mos7840_tiocmset(struct tty_struct *tty,
1502 unsigned int set, unsigned int clear)
1503{
1504 struct usb_serial_port *port = tty->driver_data;
1505 struct moschip_port *mos7840_port;
1506 unsigned int mcr;
1507 int status;
1508
1509 mos7840_port = mos7840_get_port_private(port);
1510
1511 if (mos7840_port == NULL)
1512 return -ENODEV;
1513
1514 /* FIXME: What locks the port registers ? */
1515 mcr = mos7840_port->shadowMCR;
1516 if (clear & TIOCM_RTS)
1517 mcr &= ~MCR_RTS;
1518 if (clear & TIOCM_DTR)
1519 mcr &= ~MCR_DTR;
1520 if (clear & TIOCM_LOOP)
1521 mcr &= ~MCR_LOOPBACK;
1522
1523 if (set & TIOCM_RTS)
1524 mcr |= MCR_RTS;
1525 if (set & TIOCM_DTR)
1526 mcr |= MCR_DTR;
1527 if (set & TIOCM_LOOP)
1528 mcr |= MCR_LOOPBACK;
1529
1530 mos7840_port->shadowMCR = mcr;
1531
1532 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1533 if (status < 0) {
1534 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1535 return status;
1536 }
1537
1538 return 0;
1539}
1540
1541/*****************************************************************************
1542 * mos7840_calc_baud_rate_divisor
1543 * this function calculates the proper baud rate divisor for the specified
1544 * baud rate.
1545 *****************************************************************************/
1546static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1547 int baudRate, int *divisor,
1548 __u16 *clk_sel_val)
1549{
1550 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1551
1552 if (baudRate <= 115200) {
1553 *divisor = 115200 / baudRate;
1554 *clk_sel_val = 0x0;
1555 }
1556 if ((baudRate > 115200) && (baudRate <= 230400)) {
1557 *divisor = 230400 / baudRate;
1558 *clk_sel_val = 0x10;
1559 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1560 *divisor = 403200 / baudRate;
1561 *clk_sel_val = 0x20;
1562 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1563 *divisor = 460800 / baudRate;
1564 *clk_sel_val = 0x30;
1565 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1566 *divisor = 806400 / baudRate;
1567 *clk_sel_val = 0x40;
1568 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1569 *divisor = 921600 / baudRate;
1570 *clk_sel_val = 0x50;
1571 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1572 *divisor = 1572864 / baudRate;
1573 *clk_sel_val = 0x60;
1574 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1575 *divisor = 3145728 / baudRate;
1576 *clk_sel_val = 0x70;
1577 }
1578 return 0;
1579}
1580
1581/*****************************************************************************
1582 * mos7840_send_cmd_write_baud_rate
1583 * this function sends the proper command to change the baud rate of the
1584 * specified port.
1585 *****************************************************************************/
1586
1587static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1588 int baudRate)
1589{
1590 int divisor = 0;
1591 int status;
1592 __u16 Data;
1593 unsigned char number;
1594 __u16 clk_sel_val;
1595 struct usb_serial_port *port;
1596
1597 if (mos7840_port == NULL)
1598 return -1;
1599
1600 port = mos7840_port->port;
1601 if (mos7840_port_paranoia_check(port, __func__))
1602 return -1;
1603
1604 if (mos7840_serial_paranoia_check(port->serial, __func__))
1605 return -1;
1606
1607 number = mos7840_port->port->port_number;
1608
1609 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1610 /* reset clk_uart_sel in spregOffset */
1611 if (baudRate > 115200) {
1612#ifdef HW_flow_control
1613 /* NOTE: need to see the pther register to modify */
1614 /* setting h/w flow control bit to 1 */
1615 Data = 0x2b;
1616 mos7840_port->shadowMCR = Data;
1617 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1618 Data);
1619 if (status < 0) {
1620 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1621 return -1;
1622 }
1623#endif
1624
1625 } else {
1626#ifdef HW_flow_control
1627 /* setting h/w flow control bit to 0 */
1628 Data = 0xb;
1629 mos7840_port->shadowMCR = Data;
1630 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1631 Data);
1632 if (status < 0) {
1633 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1634 return -1;
1635 }
1636#endif
1637
1638 }
1639
1640 if (1) { /* baudRate <= 115200) */
1641 clk_sel_val = 0x0;
1642 Data = 0x0;
1643 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1644 &clk_sel_val);
1645 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1646 &Data);
1647 if (status < 0) {
1648 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1649 return -1;
1650 }
1651 Data = (Data & 0x8f) | clk_sel_val;
1652 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1653 Data);
1654 if (status < 0) {
1655 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1656 return -1;
1657 }
1658 /* Calculate the Divisor */
1659
1660 if (status) {
1661 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1662 return status;
1663 }
1664 /* Enable access to divisor latch */
1665 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1666 mos7840_port->shadowLCR = Data;
1667 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1668
1669 /* Write the divisor */
1670 Data = (unsigned char)(divisor & 0xff);
1671 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1672 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1673
1674 Data = (unsigned char)((divisor & 0xff00) >> 8);
1675 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1676 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1677
1678 /* Disable access to divisor latch */
1679 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1680 mos7840_port->shadowLCR = Data;
1681 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1682
1683 }
1684 return status;
1685}
1686
1687/*****************************************************************************
1688 * mos7840_change_port_settings
1689 * This routine is called to set the UART on the device to match
1690 * the specified new settings.
1691 *****************************************************************************/
1692
1693static void mos7840_change_port_settings(struct tty_struct *tty,
1694 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1695{
1696 int baud;
1697 unsigned cflag;
1698 unsigned iflag;
1699 __u8 lData;
1700 __u8 lParity;
1701 __u8 lStop;
1702 int status;
1703 __u16 Data;
1704 struct usb_serial_port *port;
1705 struct usb_serial *serial;
1706
1707 if (mos7840_port == NULL)
1708 return;
1709
1710 port = mos7840_port->port;
1711
1712 if (mos7840_port_paranoia_check(port, __func__))
1713 return;
1714
1715 if (mos7840_serial_paranoia_check(port->serial, __func__))
1716 return;
1717
1718 serial = port->serial;
1719
1720 if (!mos7840_port->open) {
1721 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1722 return;
1723 }
1724
1725 lData = LCR_BITS_8;
1726 lStop = LCR_STOP_1;
1727 lParity = LCR_PAR_NONE;
1728
1729 cflag = tty->termios.c_cflag;
1730 iflag = tty->termios.c_iflag;
1731
1732 /* Change the number of bits */
1733 switch (cflag & CSIZE) {
1734 case CS5:
1735 lData = LCR_BITS_5;
1736 break;
1737
1738 case CS6:
1739 lData = LCR_BITS_6;
1740 break;
1741
1742 case CS7:
1743 lData = LCR_BITS_7;
1744 break;
1745
1746 default:
1747 case CS8:
1748 lData = LCR_BITS_8;
1749 break;
1750 }
1751
1752 /* Change the Parity bit */
1753 if (cflag & PARENB) {
1754 if (cflag & PARODD) {
1755 lParity = LCR_PAR_ODD;
1756 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1757 } else {
1758 lParity = LCR_PAR_EVEN;
1759 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1760 }
1761
1762 } else {
1763 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1764 }
1765
1766 if (cflag & CMSPAR)
1767 lParity = lParity | 0x20;
1768
1769 /* Change the Stop bit */
1770 if (cflag & CSTOPB) {
1771 lStop = LCR_STOP_2;
1772 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1773 } else {
1774 lStop = LCR_STOP_1;
1775 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1776 }
1777
1778 /* Update the LCR with the correct value */
1779 mos7840_port->shadowLCR &=
1780 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1781 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1782
1783 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1784 mos7840_port->shadowLCR);
1785 /* Disable Interrupts */
1786 Data = 0x00;
1787 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1788
1789 Data = 0x00;
1790 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1791
1792 Data = 0xcf;
1793 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1794
1795 /* Send the updated LCR value to the mos7840 */
1796 Data = mos7840_port->shadowLCR;
1797
1798 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1799
1800 Data = 0x00b;
1801 mos7840_port->shadowMCR = Data;
1802 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1803 Data = 0x00b;
1804 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1805
1806 /* set up the MCR register and send it to the mos7840 */
1807
1808 mos7840_port->shadowMCR = MCR_MASTER_IE;
1809 if (cflag & CBAUD)
1810 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1811
1812 if (cflag & CRTSCTS)
1813 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1814 else
1815 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1816
1817 Data = mos7840_port->shadowMCR;
1818 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1819
1820 /* Determine divisor based on baud rate */
1821 baud = tty_get_baud_rate(tty);
1822
1823 if (!baud) {
1824 /* pick a default, any default... */
1825 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1826 baud = 9600;
1827 }
1828
1829 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1830 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1831
1832 /* Enable Interrupts */
1833 Data = 0x0c;
1834 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1835
1836 if (!mos7840_port->read_urb_busy) {
1837 mos7840_port->read_urb_busy = true;
1838 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1839 if (status) {
1840 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1841 status);
1842 mos7840_port->read_urb_busy = false;
1843 }
1844 }
1845 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1846 mos7840_port->shadowLCR);
1847}
1848
1849/*****************************************************************************
1850 * mos7840_set_termios
1851 * this function is called by the tty driver when it wants to change
1852 * the termios structure
1853 *****************************************************************************/
1854
1855static void mos7840_set_termios(struct tty_struct *tty,
1856 struct usb_serial_port *port,
1857 struct ktermios *old_termios)
1858{
1859 int status;
1860 unsigned int cflag;
1861 struct usb_serial *serial;
1862 struct moschip_port *mos7840_port;
1863
1864 if (mos7840_port_paranoia_check(port, __func__))
1865 return;
1866
1867 serial = port->serial;
1868
1869 if (mos7840_serial_paranoia_check(serial, __func__))
1870 return;
1871
1872 mos7840_port = mos7840_get_port_private(port);
1873
1874 if (mos7840_port == NULL)
1875 return;
1876
1877 if (!mos7840_port->open) {
1878 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1879 return;
1880 }
1881
1882 dev_dbg(&port->dev, "%s", "setting termios - \n");
1883
1884 cflag = tty->termios.c_cflag;
1885
1886 dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1887 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1888 dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1889 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1890
1891 /* change the port settings to the new ones specified */
1892
1893 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1894
1895 if (!mos7840_port->read_urb) {
1896 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1897 return;
1898 }
1899
1900 if (!mos7840_port->read_urb_busy) {
1901 mos7840_port->read_urb_busy = true;
1902 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1903 if (status) {
1904 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1905 status);
1906 mos7840_port->read_urb_busy = false;
1907 }
1908 }
1909}
1910
1911/*****************************************************************************
1912 * mos7840_get_lsr_info - get line status register info
1913 *
1914 * Purpose: Let user call ioctl() to get info when the UART physically
1915 * is emptied. On bus types like RS485, the transmitter must
1916 * release the bus after transmitting. This must be done when
1917 * the transmit shift register is empty, not be done when the
1918 * transmit holding register is empty. This functionality
1919 * allows an RS485 driver to be written in user space.
1920 *****************************************************************************/
1921
1922static int mos7840_get_lsr_info(struct tty_struct *tty,
1923 unsigned int __user *value)
1924{
1925 int count;
1926 unsigned int result = 0;
1927
1928 count = mos7840_chars_in_buffer(tty);
1929 if (count == 0)
1930 result = TIOCSER_TEMT;
1931
1932 if (copy_to_user(value, &result, sizeof(int)))
1933 return -EFAULT;
1934 return 0;
1935}
1936
1937/*****************************************************************************
1938 * mos7840_get_serial_info
1939 * function to get information about serial port
1940 *****************************************************************************/
1941
1942static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1943 struct serial_struct __user *retinfo)
1944{
1945 struct serial_struct tmp;
1946
1947 if (mos7840_port == NULL)
1948 return -1;
1949
1950 memset(&tmp, 0, sizeof(tmp));
1951
1952 tmp.type = PORT_16550A;
1953 tmp.line = mos7840_port->port->minor;
1954 tmp.port = mos7840_port->port->port_number;
1955 tmp.irq = 0;
1956 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1957 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1958 tmp.baud_base = 9600;
1959 tmp.close_delay = 5 * HZ;
1960 tmp.closing_wait = 30 * HZ;
1961
1962 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1963 return -EFAULT;
1964 return 0;
1965}
1966
1967/*****************************************************************************
1968 * SerialIoctl
1969 * this function handles any ioctl calls to the driver
1970 *****************************************************************************/
1971
1972static int mos7840_ioctl(struct tty_struct *tty,
1973 unsigned int cmd, unsigned long arg)
1974{
1975 struct usb_serial_port *port = tty->driver_data;
1976 void __user *argp = (void __user *)arg;
1977 struct moschip_port *mos7840_port;
1978
1979 if (mos7840_port_paranoia_check(port, __func__))
1980 return -1;
1981
1982 mos7840_port = mos7840_get_port_private(port);
1983
1984 if (mos7840_port == NULL)
1985 return -1;
1986
1987 switch (cmd) {
1988 /* return number of bytes available */
1989
1990 case TIOCSERGETLSR:
1991 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1992 return mos7840_get_lsr_info(tty, argp);
1993
1994 case TIOCGSERIAL:
1995 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1996 return mos7840_get_serial_info(mos7840_port, argp);
1997
1998 case TIOCSSERIAL:
1999 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2000 break;
2001 default:
2002 break;
2003 }
2004 return -ENOIOCTLCMD;
2005}
2006
2007static int mos7810_check(struct usb_serial *serial)
2008{
2009 int i, pass_count = 0;
2010 u8 *buf;
2011 __u16 data = 0, mcr_data = 0;
2012 __u16 test_pattern = 0x55AA;
2013 int res;
2014
2015 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2016 if (!buf)
2017 return 0; /* failed to identify 7810 */
2018
2019 /* Store MCR setting */
2020 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2021 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2022 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2023 if (res == VENDOR_READ_LENGTH)
2024 mcr_data = *buf;
2025
2026 for (i = 0; i < 16; i++) {
2027 /* Send the 1-bit test pattern out to MCS7810 test pin */
2028 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2029 MCS_WRREQ, MCS_WR_RTYPE,
2030 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2031 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2032
2033 /* Read the test pattern back */
2034 res = usb_control_msg(serial->dev,
2035 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2036 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2037 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2038 if (res == VENDOR_READ_LENGTH)
2039 data = *buf;
2040
2041 /* If this is a MCS7810 device, both test patterns must match */
2042 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2043 break;
2044
2045 pass_count++;
2046 }
2047
2048 /* Restore MCR setting */
2049 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2050 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2051 0, MOS_WDR_TIMEOUT);
2052
2053 kfree(buf);
2054
2055 if (pass_count == 16)
2056 return 1;
2057
2058 return 0;
2059}
2060
2061static int mos7840_probe(struct usb_serial *serial,
2062 const struct usb_device_id *id)
2063{
2064 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2065 u8 *buf;
2066 int device_type;
2067
2068 if (product == MOSCHIP_DEVICE_ID_7810 ||
2069 product == MOSCHIP_DEVICE_ID_7820) {
2070 device_type = product;
2071 goto out;
2072 }
2073
2074 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2075 if (!buf)
2076 return -ENOMEM;
2077
2078 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2079 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2080 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2081
2082 /* For a MCS7840 device GPIO0 must be set to 1 */
2083 if (buf[0] & 0x01)
2084 device_type = MOSCHIP_DEVICE_ID_7840;
2085 else if (mos7810_check(serial))
2086 device_type = MOSCHIP_DEVICE_ID_7810;
2087 else
2088 device_type = MOSCHIP_DEVICE_ID_7820;
2089
2090 kfree(buf);
2091out:
2092 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2093
2094 return 0;
2095}
2096
2097static int mos7840_calc_num_ports(struct usb_serial *serial)
2098{
2099 int device_type = (unsigned long)usb_get_serial_data(serial);
2100 int mos7840_num_ports;
2101
2102 mos7840_num_ports = (device_type >> 4) & 0x000F;
2103
2104 return mos7840_num_ports;
2105}
2106
2107static int mos7840_attach(struct usb_serial *serial)
2108{
2109 if (serial->num_bulk_in < serial->num_ports ||
2110 serial->num_bulk_out < serial->num_ports ||
2111 serial->num_interrupt_in < 1) {
2112 dev_err(&serial->interface->dev, "missing endpoints\n");
2113 return -ENODEV;
2114 }
2115
2116 return 0;
2117}
2118
2119static int mos7840_port_probe(struct usb_serial_port *port)
2120{
2121 struct usb_serial *serial = port->serial;
2122 int device_type = (unsigned long)usb_get_serial_data(serial);
2123 struct moschip_port *mos7840_port;
2124 int status;
2125 int pnum;
2126 __u16 Data;
2127
2128 /* we set up the pointers to the endpoints in the mos7840_open *
2129 * function, as the structures aren't created yet. */
2130
2131 pnum = port->port_number;
2132
2133 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2134 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2135 if (!mos7840_port)
2136 return -ENOMEM;
2137
2138 /* Initialize all port interrupt end point to port 0 int
2139 * endpoint. Our device has only one interrupt end point
2140 * common to all port */
2141
2142 mos7840_port->port = port;
2143 mos7840_set_port_private(port, mos7840_port);
2144 spin_lock_init(&mos7840_port->pool_lock);
2145
2146 /* minor is not initialised until later by
2147 * usb-serial.c:get_free_serial() and cannot therefore be used
2148 * to index device instances */
2149 mos7840_port->port_num = pnum + 1;
2150 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2151 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2152
2153 if (mos7840_port->port_num == 1) {
2154 mos7840_port->SpRegOffset = 0x0;
2155 mos7840_port->ControlRegOffset = 0x1;
2156 mos7840_port->DcrRegOffset = 0x4;
2157 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2158 mos7840_port->SpRegOffset = 0x8;
2159 mos7840_port->ControlRegOffset = 0x9;
2160 mos7840_port->DcrRegOffset = 0x16;
2161 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2162 mos7840_port->SpRegOffset = 0xa;
2163 mos7840_port->ControlRegOffset = 0xb;
2164 mos7840_port->DcrRegOffset = 0x19;
2165 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2166 mos7840_port->SpRegOffset = 0xa;
2167 mos7840_port->ControlRegOffset = 0xb;
2168 mos7840_port->DcrRegOffset = 0x19;
2169 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2170 mos7840_port->SpRegOffset = 0xc;
2171 mos7840_port->ControlRegOffset = 0xd;
2172 mos7840_port->DcrRegOffset = 0x1c;
2173 }
2174 mos7840_dump_serial_port(port, mos7840_port);
2175 mos7840_set_port_private(port, mos7840_port);
2176
2177 /* enable rx_disable bit in control register */
2178 status = mos7840_get_reg_sync(port,
2179 mos7840_port->ControlRegOffset, &Data);
2180 if (status < 0) {
2181 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2182 goto out;
2183 } else
2184 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2185 Data |= 0x08; /* setting driver done bit */
2186 Data |= 0x04; /* sp1_bit to have cts change reflect in
2187 modem status reg */
2188
2189 /* Data |= 0x20; //rx_disable bit */
2190 status = mos7840_set_reg_sync(port,
2191 mos7840_port->ControlRegOffset, Data);
2192 if (status < 0) {
2193 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2194 goto out;
2195 } else
2196 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2197
2198 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2199 and 0x24 in DCR3 */
2200 Data = 0x01;
2201 status = mos7840_set_reg_sync(port,
2202 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2203 if (status < 0) {
2204 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2205 goto out;
2206 } else
2207 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2208
2209 Data = 0x05;
2210 status = mos7840_set_reg_sync(port,
2211 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2212 if (status < 0) {
2213 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2214 goto out;
2215 } else
2216 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2217
2218 Data = 0x24;
2219 status = mos7840_set_reg_sync(port,
2220 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2221 if (status < 0) {
2222 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2223 goto out;
2224 } else
2225 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2226
2227 /* write values in clkstart0x0 and clkmulti 0x20 */
2228 Data = 0x0;
2229 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2230 if (status < 0) {
2231 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2232 goto out;
2233 } else
2234 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2235
2236 Data = 0x20;
2237 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2238 if (status < 0) {
2239 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2240 goto error;
2241 } else
2242 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2243
2244 /* write value 0x0 to scratchpad register */
2245 Data = 0x00;
2246 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2247 if (status < 0) {
2248 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2249 goto out;
2250 } else
2251 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2252
2253 /* Zero Length flag register */
2254 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2255 Data = 0xff;
2256 status = mos7840_set_reg_sync(port,
2257 (__u16) (ZLP_REG1 +
2258 ((__u16)mos7840_port->port_num)), Data);
2259 dev_dbg(&port->dev, "ZLIP offset %x\n",
2260 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2261 if (status < 0) {
2262 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2263 goto out;
2264 } else
2265 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2266 } else {
2267 Data = 0xff;
2268 status = mos7840_set_reg_sync(port,
2269 (__u16) (ZLP_REG1 +
2270 ((__u16)mos7840_port->port_num) - 0x1), Data);
2271 dev_dbg(&port->dev, "ZLIP offset %x\n",
2272 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2273 if (status < 0) {
2274 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2275 goto out;
2276 } else
2277 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2278
2279 }
2280 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2281 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2282 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2283 GFP_KERNEL);
2284 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2285 !mos7840_port->dr) {
2286 status = -ENOMEM;
2287 goto error;
2288 }
2289
2290 mos7840_port->has_led = false;
2291
2292 /* Initialize LED timers */
2293 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2294 mos7840_port->has_led = true;
2295
2296 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2297 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2298 GFP_KERNEL);
2299 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2300 status = -ENOMEM;
2301 goto error;
2302 }
2303
2304 setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
2305 (unsigned long)mos7840_port);
2306 mos7840_port->led_timer1.expires =
2307 jiffies + msecs_to_jiffies(LED_ON_MS);
2308 setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
2309 (unsigned long)mos7840_port);
2310 mos7840_port->led_timer2.expires =
2311 jiffies + msecs_to_jiffies(LED_OFF_MS);
2312
2313 /* Turn off LED */
2314 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2315 }
2316out:
2317 if (pnum == serial->num_ports - 1) {
2318 /* Zero Length flag enable */
2319 Data = 0x0f;
2320 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2321 if (status < 0) {
2322 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2323 goto error;
2324 } else
2325 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2326
2327 /* setting configuration feature to one */
2328 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2329 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2330 MOS_WDR_TIMEOUT);
2331 }
2332 return 0;
2333error:
2334 kfree(mos7840_port->led_dr);
2335 usb_free_urb(mos7840_port->led_urb);
2336 kfree(mos7840_port->dr);
2337 kfree(mos7840_port->ctrl_buf);
2338 usb_free_urb(mos7840_port->control_urb);
2339 kfree(mos7840_port);
2340
2341 return status;
2342}
2343
2344static int mos7840_port_remove(struct usb_serial_port *port)
2345{
2346 struct moschip_port *mos7840_port;
2347
2348 mos7840_port = mos7840_get_port_private(port);
2349
2350 if (mos7840_port->has_led) {
2351 /* Turn off LED */
2352 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2353
2354 del_timer_sync(&mos7840_port->led_timer1);
2355 del_timer_sync(&mos7840_port->led_timer2);
2356
2357 usb_kill_urb(mos7840_port->led_urb);
2358 usb_free_urb(mos7840_port->led_urb);
2359 kfree(mos7840_port->led_dr);
2360 }
2361 usb_kill_urb(mos7840_port->control_urb);
2362 usb_free_urb(mos7840_port->control_urb);
2363 kfree(mos7840_port->ctrl_buf);
2364 kfree(mos7840_port->dr);
2365 kfree(mos7840_port);
2366
2367 return 0;
2368}
2369
2370static struct usb_serial_driver moschip7840_4port_device = {
2371 .driver = {
2372 .owner = THIS_MODULE,
2373 .name = "mos7840",
2374 },
2375 .description = DRIVER_DESC,
2376 .id_table = id_table,
2377 .num_ports = 4,
2378 .open = mos7840_open,
2379 .close = mos7840_close,
2380 .write = mos7840_write,
2381 .write_room = mos7840_write_room,
2382 .chars_in_buffer = mos7840_chars_in_buffer,
2383 .throttle = mos7840_throttle,
2384 .unthrottle = mos7840_unthrottle,
2385 .calc_num_ports = mos7840_calc_num_ports,
2386 .probe = mos7840_probe,
2387 .ioctl = mos7840_ioctl,
2388 .set_termios = mos7840_set_termios,
2389 .break_ctl = mos7840_break,
2390 .tiocmget = mos7840_tiocmget,
2391 .tiocmset = mos7840_tiocmset,
2392 .tiocmiwait = usb_serial_generic_tiocmiwait,
2393 .get_icount = usb_serial_generic_get_icount,
2394 .attach = mos7840_attach,
2395 .port_probe = mos7840_port_probe,
2396 .port_remove = mos7840_port_remove,
2397 .read_bulk_callback = mos7840_bulk_in_callback,
2398 .read_int_callback = mos7840_interrupt_callback,
2399};
2400
2401static struct usb_serial_driver * const serial_drivers[] = {
2402 &moschip7840_4port_device, NULL
2403};
2404
2405module_usb_serial_driver(serial_drivers, id_table);
2406
2407MODULE_DESCRIPTION(DRIVER_DESC);
2408MODULE_LICENSE("GPL");