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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// 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/* vendor id and device id defines */
93
94/* The native mos7840/7820 component */
95#define USB_VENDOR_ID_MOSCHIP 0x9710
96#define MOSCHIP_DEVICE_ID_7840 0x7840
97#define MOSCHIP_DEVICE_ID_7820 0x7820
98#define MOSCHIP_DEVICE_ID_7810 0x7810
99/* The native component can have its vendor/device id's overridden
100 * in vendor-specific implementations. Such devices can be handled
101 * by making a change here, in id_table.
102 */
103#define USB_VENDOR_ID_BANDB 0x0856
104#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
105#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
106#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
107#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
108#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
109#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
110#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
111#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
112#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
113#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
114#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
115#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
116#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
117
118/* This driver also supports
119 * ATEN UC2324 device using Moschip MCS7840
120 * ATEN UC2322 device using Moschip MCS7820
121 */
122#define USB_VENDOR_ID_ATENINTL 0x0557
123#define ATENINTL_DEVICE_ID_UC2324 0x2011
124#define ATENINTL_DEVICE_ID_UC2322 0x7820
125
126/* Interrupt Routine Defines */
127
128#define SERIAL_IIR_RLS 0x06
129#define SERIAL_IIR_MS 0x00
130
131/*
132 * Emulation of the bit mask on the LINE STATUS REGISTER.
133 */
134#define SERIAL_LSR_DR 0x0001
135#define SERIAL_LSR_OE 0x0002
136#define SERIAL_LSR_PE 0x0004
137#define SERIAL_LSR_FE 0x0008
138#define SERIAL_LSR_BI 0x0010
139
140#define MOS_MSR_DELTA_CTS 0x10
141#define MOS_MSR_DELTA_DSR 0x20
142#define MOS_MSR_DELTA_RI 0x40
143#define MOS_MSR_DELTA_CD 0x80
144
145/* Serial Port register Address */
146#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
147#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
148#define LINE_CONTROL_REGISTER ((__u16)(0x03))
149#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
150#define LINE_STATUS_REGISTER ((__u16)(0x05))
151#define MODEM_STATUS_REGISTER ((__u16)(0x06))
152#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
153#define DIVISOR_LATCH_LSB ((__u16)(0x00))
154#define DIVISOR_LATCH_MSB ((__u16)(0x01))
155
156#define CLK_MULTI_REGISTER ((__u16)(0x02))
157#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
158#define GPIO_REGISTER ((__u16)(0x07))
159
160#define SERIAL_LCR_DLAB ((__u16)(0x0080))
161
162/*
163 * URB POOL related defines
164 */
165#define NUM_URBS 16 /* URB Count */
166#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
167
168/* LED on/off milliseconds*/
169#define LED_ON_MS 500
170#define LED_OFF_MS 500
171
172enum mos7840_flag {
173 MOS7840_FLAG_CTRL_BUSY,
174 MOS7840_FLAG_LED_BUSY,
175};
176
177static const struct usb_device_id id_table[] = {
178 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
180 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
181 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
182 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
183 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
184 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
194 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
195 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
196 {} /* terminating entry */
197};
198MODULE_DEVICE_TABLE(usb, id_table);
199
200/* This structure holds all of the local port information */
201
202struct moschip_port {
203 int port_num; /*Actual port number in the device(1,2,etc) */
204 struct urb *read_urb; /* read URB for this port */
205 __u8 shadowLCR; /* last LCR value received */
206 __u8 shadowMCR; /* last MCR value received */
207 char open;
208 char open_ports;
209 struct usb_serial_port *port; /* loop back to the owner of this object */
210
211 /* Offsets */
212 __u8 SpRegOffset;
213 __u8 ControlRegOffset;
214 __u8 DcrRegOffset;
215 /* for processing control URBS in interrupt context */
216 struct urb *control_urb;
217 struct usb_ctrlrequest *dr;
218 char *ctrl_buf;
219 int MsrLsr;
220
221 spinlock_t pool_lock;
222 struct urb *write_urb_pool[NUM_URBS];
223 char busy[NUM_URBS];
224 bool read_urb_busy;
225
226 /* For device(s) with LED indicator */
227 bool has_led;
228 struct timer_list led_timer1; /* Timer for LED on */
229 struct timer_list led_timer2; /* Timer for LED off */
230 struct urb *led_urb;
231 struct usb_ctrlrequest *led_dr;
232
233 unsigned long flags;
234};
235
236/*
237 * mos7840_set_reg_sync
238 * To set the Control register by calling usb_fill_control_urb function
239 * by passing usb_sndctrlpipe function as parameter.
240 */
241
242static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
243 __u16 val)
244{
245 struct usb_device *dev = port->serial->dev;
246 val = val & 0x00ff;
247 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
248
249 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
250 MCS_WR_RTYPE, val, reg, NULL, 0,
251 MOS_WDR_TIMEOUT);
252}
253
254/*
255 * mos7840_get_reg_sync
256 * To set the Uart register by calling usb_fill_control_urb function by
257 * passing usb_rcvctrlpipe function as parameter.
258 */
259
260static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
261 __u16 *val)
262{
263 struct usb_device *dev = port->serial->dev;
264 int ret = 0;
265 u8 *buf;
266
267 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
268 if (!buf)
269 return -ENOMEM;
270
271 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
272 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
273 MOS_WDR_TIMEOUT);
274 if (ret < VENDOR_READ_LENGTH) {
275 if (ret >= 0)
276 ret = -EIO;
277 goto out;
278 }
279
280 *val = buf[0];
281 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
282out:
283 kfree(buf);
284 return ret;
285}
286
287/*
288 * mos7840_set_uart_reg
289 * To set the Uart register by calling usb_fill_control_urb function by
290 * passing usb_sndctrlpipe function as parameter.
291 */
292
293static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
294 __u16 val)
295{
296
297 struct usb_device *dev = port->serial->dev;
298 val = val & 0x00ff;
299 /* For the UART control registers, the application number need
300 to be Or'ed */
301 if (port->serial->num_ports == 4) {
302 val |= ((__u16)port->port_number + 1) << 8;
303 } else {
304 if (port->port_number == 0) {
305 val |= ((__u16)port->port_number + 1) << 8;
306 } else {
307 val |= ((__u16)port->port_number + 2) << 8;
308 }
309 }
310 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
311 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
312 MCS_WR_RTYPE, val, reg, NULL, 0,
313 MOS_WDR_TIMEOUT);
314
315}
316
317/*
318 * mos7840_get_uart_reg
319 * To set the Control register by calling usb_fill_control_urb function
320 * by passing usb_rcvctrlpipe function as parameter.
321 */
322static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
323 __u16 *val)
324{
325 struct usb_device *dev = port->serial->dev;
326 int ret = 0;
327 __u16 Wval;
328 u8 *buf;
329
330 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
331 if (!buf)
332 return -ENOMEM;
333
334 /* Wval is same as application number */
335 if (port->serial->num_ports == 4) {
336 Wval = ((__u16)port->port_number + 1) << 8;
337 } else {
338 if (port->port_number == 0) {
339 Wval = ((__u16)port->port_number + 1) << 8;
340 } else {
341 Wval = ((__u16)port->port_number + 2) << 8;
342 }
343 }
344 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
345 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
346 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
347 MOS_WDR_TIMEOUT);
348 if (ret < VENDOR_READ_LENGTH) {
349 if (ret >= 0)
350 ret = -EIO;
351 goto out;
352 }
353 *val = buf[0];
354out:
355 kfree(buf);
356 return ret;
357}
358
359static void mos7840_dump_serial_port(struct usb_serial_port *port,
360 struct moschip_port *mos7840_port)
361{
362
363 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
364 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
365 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
366
367}
368
369/************************************************************************/
370/************************************************************************/
371/* I N T E R F A C E F U N C T I O N S */
372/* I N T E R F A C E F U N C T I O N S */
373/************************************************************************/
374/************************************************************************/
375
376static inline void mos7840_set_port_private(struct usb_serial_port *port,
377 struct moschip_port *data)
378{
379 usb_set_serial_port_data(port, (void *)data);
380}
381
382static inline struct moschip_port *mos7840_get_port_private(struct
383 usb_serial_port
384 *port)
385{
386 return (struct moschip_port *)usb_get_serial_port_data(port);
387}
388
389static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
390{
391 struct moschip_port *mos7840_port;
392 struct async_icount *icount;
393 mos7840_port = port;
394 if (new_msr &
395 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
396 MOS_MSR_DELTA_CD)) {
397 icount = &mos7840_port->port->icount;
398
399 /* update input line counters */
400 if (new_msr & MOS_MSR_DELTA_CTS)
401 icount->cts++;
402 if (new_msr & MOS_MSR_DELTA_DSR)
403 icount->dsr++;
404 if (new_msr & MOS_MSR_DELTA_CD)
405 icount->dcd++;
406 if (new_msr & MOS_MSR_DELTA_RI)
407 icount->rng++;
408
409 wake_up_interruptible(&port->port->port.delta_msr_wait);
410 }
411}
412
413static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
414{
415 struct async_icount *icount;
416
417 if (new_lsr & SERIAL_LSR_BI) {
418 /*
419 * Parity and Framing errors only count if they
420 * occur exclusive of a break being
421 * received.
422 */
423 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
424 }
425
426 /* update input line counters */
427 icount = &port->port->icount;
428 if (new_lsr & SERIAL_LSR_BI)
429 icount->brk++;
430 if (new_lsr & SERIAL_LSR_OE)
431 icount->overrun++;
432 if (new_lsr & SERIAL_LSR_PE)
433 icount->parity++;
434 if (new_lsr & SERIAL_LSR_FE)
435 icount->frame++;
436}
437
438/************************************************************************/
439/************************************************************************/
440/* U S B C A L L B A C K F U N C T I O N S */
441/* U S B C A L L B A C K F U N C T I O N S */
442/************************************************************************/
443/************************************************************************/
444
445static void mos7840_control_callback(struct urb *urb)
446{
447 unsigned char *data;
448 struct moschip_port *mos7840_port;
449 struct device *dev = &urb->dev->dev;
450 __u8 regval = 0x0;
451 int status = urb->status;
452
453 mos7840_port = urb->context;
454
455 switch (status) {
456 case 0:
457 /* success */
458 break;
459 case -ECONNRESET:
460 case -ENOENT:
461 case -ESHUTDOWN:
462 /* this urb is terminated, clean up */
463 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
464 goto out;
465 default:
466 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
467 goto out;
468 }
469
470 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
471 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
472 mos7840_port->MsrLsr, mos7840_port->port_num);
473 data = urb->transfer_buffer;
474 regval = (__u8) data[0];
475 dev_dbg(dev, "%s data is %x\n", __func__, regval);
476 if (mos7840_port->MsrLsr == 0)
477 mos7840_handle_new_msr(mos7840_port, regval);
478 else if (mos7840_port->MsrLsr == 1)
479 mos7840_handle_new_lsr(mos7840_port, regval);
480out:
481 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
482}
483
484static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
485 __u16 *val)
486{
487 struct usb_device *dev = mcs->port->serial->dev;
488 struct usb_ctrlrequest *dr = mcs->dr;
489 unsigned char *buffer = mcs->ctrl_buf;
490 int ret;
491
492 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
493 return -EBUSY;
494
495 dr->bRequestType = MCS_RD_RTYPE;
496 dr->bRequest = MCS_RDREQ;
497 dr->wValue = cpu_to_le16(Wval); /* 0 */
498 dr->wIndex = cpu_to_le16(reg);
499 dr->wLength = cpu_to_le16(2);
500
501 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
502 (unsigned char *)dr, buffer, 2,
503 mos7840_control_callback, mcs);
504 mcs->control_urb->transfer_buffer_length = 2;
505 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
506 if (ret)
507 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
508
509 return ret;
510}
511
512static void mos7840_set_led_callback(struct urb *urb)
513{
514 switch (urb->status) {
515 case 0:
516 /* Success */
517 break;
518 case -ECONNRESET:
519 case -ENOENT:
520 case -ESHUTDOWN:
521 /* This urb is terminated, clean up */
522 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
523 __func__, urb->status);
524 break;
525 default:
526 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
527 __func__, urb->status);
528 }
529}
530
531static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
532 __u16 reg)
533{
534 struct usb_device *dev = mcs->port->serial->dev;
535 struct usb_ctrlrequest *dr = mcs->led_dr;
536
537 dr->bRequestType = MCS_WR_RTYPE;
538 dr->bRequest = MCS_WRREQ;
539 dr->wValue = cpu_to_le16(wval);
540 dr->wIndex = cpu_to_le16(reg);
541 dr->wLength = cpu_to_le16(0);
542
543 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
544 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
545
546 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
547}
548
549static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
550 __u16 val)
551{
552 struct usb_device *dev = port->serial->dev;
553
554 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
555 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
556}
557
558static void mos7840_led_off(struct timer_list *t)
559{
560 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
561
562 /* Turn off LED */
563 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
564 mod_timer(&mcs->led_timer2,
565 jiffies + msecs_to_jiffies(LED_OFF_MS));
566}
567
568static void mos7840_led_flag_off(struct timer_list *t)
569{
570 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
571
572 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
573}
574
575static void mos7840_led_activity(struct usb_serial_port *port)
576{
577 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
578
579 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
580 return;
581
582 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
583 mod_timer(&mos7840_port->led_timer1,
584 jiffies + msecs_to_jiffies(LED_ON_MS));
585}
586
587/*****************************************************************************
588 * mos7840_interrupt_callback
589 * this is the callback function for when we have received data on the
590 * interrupt endpoint.
591 *****************************************************************************/
592
593static void mos7840_interrupt_callback(struct urb *urb)
594{
595 int result;
596 int length;
597 struct moschip_port *mos7840_port;
598 struct usb_serial *serial;
599 __u16 Data;
600 unsigned char *data;
601 __u8 sp[5], st;
602 int i, rv = 0;
603 __u16 wval, wreg = 0;
604 int status = urb->status;
605
606 switch (status) {
607 case 0:
608 /* success */
609 break;
610 case -ECONNRESET:
611 case -ENOENT:
612 case -ESHUTDOWN:
613 /* this urb is terminated, clean up */
614 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
615 __func__, status);
616 return;
617 default:
618 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
619 __func__, status);
620 goto exit;
621 }
622
623 length = urb->actual_length;
624 data = urb->transfer_buffer;
625
626 serial = urb->context;
627
628 /* Moschip get 5 bytes
629 * Byte 1 IIR Port 1 (port.number is 0)
630 * Byte 2 IIR Port 2 (port.number is 1)
631 * Byte 3 IIR Port 3 (port.number is 2)
632 * Byte 4 IIR Port 4 (port.number is 3)
633 * Byte 5 FIFO status for both */
634
635 if (length > 5) {
636 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
637 return;
638 }
639
640 sp[0] = (__u8) data[0];
641 sp[1] = (__u8) data[1];
642 sp[2] = (__u8) data[2];
643 sp[3] = (__u8) data[3];
644 st = (__u8) data[4];
645
646 for (i = 0; i < serial->num_ports; i++) {
647 mos7840_port = mos7840_get_port_private(serial->port[i]);
648 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
649 if (mos7840_port->open) {
650 if (sp[i] & 0x01) {
651 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
652 } else {
653 switch (sp[i] & 0x0f) {
654 case SERIAL_IIR_RLS:
655 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
656 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
657 mos7840_port->MsrLsr = 1;
658 wreg = LINE_STATUS_REGISTER;
659 break;
660 case SERIAL_IIR_MS:
661 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
662 mos7840_port->MsrLsr = 0;
663 wreg = MODEM_STATUS_REGISTER;
664 break;
665 }
666 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
667 }
668 }
669 }
670 if (!(rv < 0))
671 /* the completion handler for the control urb will resubmit */
672 return;
673exit:
674 result = usb_submit_urb(urb, GFP_ATOMIC);
675 if (result) {
676 dev_err(&urb->dev->dev,
677 "%s - Error %d submitting interrupt urb\n",
678 __func__, result);
679 }
680}
681
682static int mos7840_port_paranoia_check(struct usb_serial_port *port,
683 const char *function)
684{
685 if (!port) {
686 pr_debug("%s - port == NULL\n", function);
687 return -1;
688 }
689 if (!port->serial) {
690 pr_debug("%s - port->serial == NULL\n", function);
691 return -1;
692 }
693
694 return 0;
695}
696
697/* Inline functions to check the sanity of a pointer that is passed to us */
698static int mos7840_serial_paranoia_check(struct usb_serial *serial,
699 const char *function)
700{
701 if (!serial) {
702 pr_debug("%s - serial == NULL\n", function);
703 return -1;
704 }
705 if (!serial->type) {
706 pr_debug("%s - serial->type == NULL!\n", function);
707 return -1;
708 }
709
710 return 0;
711}
712
713static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
714 const char *function)
715{
716 /* if no port was specified, or it fails a paranoia check */
717 if (!port ||
718 mos7840_port_paranoia_check(port, function) ||
719 mos7840_serial_paranoia_check(port->serial, function)) {
720 /* then say that we don't have a valid usb_serial thing,
721 * which will end up genrating -ENODEV return values */
722 return NULL;
723 }
724
725 return port->serial;
726}
727
728/*****************************************************************************
729 * mos7840_bulk_in_callback
730 * this is the callback function for when we have received data on the
731 * bulk in endpoint.
732 *****************************************************************************/
733
734static void mos7840_bulk_in_callback(struct urb *urb)
735{
736 int retval;
737 unsigned char *data;
738 struct usb_serial *serial;
739 struct usb_serial_port *port;
740 struct moschip_port *mos7840_port;
741 int status = urb->status;
742
743 mos7840_port = urb->context;
744 if (!mos7840_port)
745 return;
746
747 if (status) {
748 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
749 mos7840_port->read_urb_busy = false;
750 return;
751 }
752
753 port = mos7840_port->port;
754 if (mos7840_port_paranoia_check(port, __func__)) {
755 mos7840_port->read_urb_busy = false;
756 return;
757 }
758
759 serial = mos7840_get_usb_serial(port, __func__);
760 if (!serial) {
761 mos7840_port->read_urb_busy = false;
762 return;
763 }
764
765 data = urb->transfer_buffer;
766 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
767
768 if (urb->actual_length) {
769 struct tty_port *tport = &mos7840_port->port->port;
770 tty_insert_flip_string(tport, data, urb->actual_length);
771 tty_flip_buffer_push(tport);
772 port->icount.rx += urb->actual_length;
773 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
774 }
775
776 if (!mos7840_port->read_urb) {
777 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
778 mos7840_port->read_urb_busy = false;
779 return;
780 }
781
782 if (mos7840_port->has_led)
783 mos7840_led_activity(port);
784
785 mos7840_port->read_urb_busy = true;
786 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
787
788 if (retval) {
789 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
790 mos7840_port->read_urb_busy = false;
791 }
792}
793
794/*****************************************************************************
795 * mos7840_bulk_out_data_callback
796 * this is the callback function for when we have finished sending
797 * serial data on the bulk out endpoint.
798 *****************************************************************************/
799
800static void mos7840_bulk_out_data_callback(struct urb *urb)
801{
802 struct moschip_port *mos7840_port;
803 struct usb_serial_port *port;
804 int status = urb->status;
805 int i;
806
807 mos7840_port = urb->context;
808 port = mos7840_port->port;
809 spin_lock(&mos7840_port->pool_lock);
810 for (i = 0; i < NUM_URBS; i++) {
811 if (urb == mos7840_port->write_urb_pool[i]) {
812 mos7840_port->busy[i] = 0;
813 break;
814 }
815 }
816 spin_unlock(&mos7840_port->pool_lock);
817
818 if (status) {
819 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
820 return;
821 }
822
823 if (mos7840_port_paranoia_check(port, __func__))
824 return;
825
826 if (mos7840_port->open)
827 tty_port_tty_wakeup(&port->port);
828
829}
830
831/************************************************************************/
832/* 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 */
833/************************************************************************/
834
835/*****************************************************************************
836 * mos7840_open
837 * this function is called by the tty driver when a port is opened
838 * If successful, we return 0
839 * Otherwise we return a negative error number.
840 *****************************************************************************/
841
842static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
843{
844 int response;
845 int j;
846 struct usb_serial *serial;
847 struct urb *urb;
848 __u16 Data;
849 int status;
850 struct moschip_port *mos7840_port;
851 struct moschip_port *port0;
852
853 if (mos7840_port_paranoia_check(port, __func__))
854 return -ENODEV;
855
856 serial = port->serial;
857
858 if (mos7840_serial_paranoia_check(serial, __func__))
859 return -ENODEV;
860
861 mos7840_port = mos7840_get_port_private(port);
862 port0 = mos7840_get_port_private(serial->port[0]);
863
864 if (mos7840_port == NULL || port0 == NULL)
865 return -ENODEV;
866
867 usb_clear_halt(serial->dev, port->write_urb->pipe);
868 usb_clear_halt(serial->dev, port->read_urb->pipe);
869 port0->open_ports++;
870
871 /* Initialising the write urb pool */
872 for (j = 0; j < NUM_URBS; ++j) {
873 urb = usb_alloc_urb(0, GFP_KERNEL);
874 mos7840_port->write_urb_pool[j] = urb;
875 if (!urb)
876 continue;
877
878 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
879 GFP_KERNEL);
880 if (!urb->transfer_buffer) {
881 usb_free_urb(urb);
882 mos7840_port->write_urb_pool[j] = NULL;
883 continue;
884 }
885 }
886
887/*****************************************************************************
888 * Initialize MCS7840 -- Write Init values to corresponding Registers
889 *
890 * Register Index
891 * 1 : IER
892 * 2 : FCR
893 * 3 : LCR
894 * 4 : MCR
895 *
896 * 0x08 : SP1/2 Control Reg
897 *****************************************************************************/
898
899 /* NEED to check the following Block */
900
901 Data = 0x0;
902 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
903 if (status < 0) {
904 dev_dbg(&port->dev, "Reading Spreg failed\n");
905 goto err;
906 }
907 Data |= 0x80;
908 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
909 if (status < 0) {
910 dev_dbg(&port->dev, "writing Spreg failed\n");
911 goto err;
912 }
913
914 Data &= ~0x80;
915 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
916 if (status < 0) {
917 dev_dbg(&port->dev, "writing Spreg failed\n");
918 goto err;
919 }
920 /* End of block to be checked */
921
922 Data = 0x0;
923 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
924 &Data);
925 if (status < 0) {
926 dev_dbg(&port->dev, "Reading Controlreg failed\n");
927 goto err;
928 }
929 Data |= 0x08; /* Driver done bit */
930 Data |= 0x20; /* rx_disable */
931 status = mos7840_set_reg_sync(port,
932 mos7840_port->ControlRegOffset, Data);
933 if (status < 0) {
934 dev_dbg(&port->dev, "writing Controlreg failed\n");
935 goto err;
936 }
937 /* do register settings here */
938 /* Set all regs to the device default values. */
939 /***********************************
940 * First Disable all interrupts.
941 ***********************************/
942 Data = 0x00;
943 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
944 if (status < 0) {
945 dev_dbg(&port->dev, "disabling interrupts failed\n");
946 goto err;
947 }
948 /* Set FIFO_CONTROL_REGISTER to the default value */
949 Data = 0x00;
950 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
951 if (status < 0) {
952 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
953 goto err;
954 }
955
956 Data = 0xcf;
957 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
958 if (status < 0) {
959 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
960 goto err;
961 }
962
963 Data = 0x03;
964 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
965 mos7840_port->shadowLCR = Data;
966
967 Data = 0x0b;
968 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
969 mos7840_port->shadowMCR = Data;
970
971 Data = 0x00;
972 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
973 mos7840_port->shadowLCR = Data;
974
975 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
976 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
977
978 Data = 0x0c;
979 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
980
981 Data = 0x0;
982 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
983
984 Data = 0x00;
985 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
986
987 Data = Data & ~SERIAL_LCR_DLAB;
988 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
989 mos7840_port->shadowLCR = Data;
990
991 /* clearing Bulkin and Bulkout Fifo */
992 Data = 0x0;
993 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
994
995 Data = Data | 0x0c;
996 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
997
998 Data = Data & ~0x0c;
999 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1000 /* Finally enable all interrupts */
1001 Data = 0x0c;
1002 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1003
1004 /* clearing rx_disable */
1005 Data = 0x0;
1006 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1007 &Data);
1008 Data = Data & ~0x20;
1009 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1010 Data);
1011
1012 /* rx_negate */
1013 Data = 0x0;
1014 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1015 &Data);
1016 Data = Data | 0x10;
1017 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1018 Data);
1019
1020 /* Check to see if we've set up our endpoint info yet *
1021 * (can't set it up in mos7840_startup as the structures *
1022 * were not set up at that time.) */
1023 if (port0->open_ports == 1) {
1024 /* FIXME: Buffer never NULL, so URB is not submitted. */
1025 if (serial->port[0]->interrupt_in_buffer == NULL) {
1026 /* set up interrupt urb */
1027 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1028 serial->dev,
1029 usb_rcvintpipe(serial->dev,
1030 serial->port[0]->interrupt_in_endpointAddress),
1031 serial->port[0]->interrupt_in_buffer,
1032 serial->port[0]->interrupt_in_urb->
1033 transfer_buffer_length,
1034 mos7840_interrupt_callback,
1035 serial,
1036 serial->port[0]->interrupt_in_urb->interval);
1037
1038 /* start interrupt read for mos7840 */
1039 response =
1040 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1041 GFP_KERNEL);
1042 if (response) {
1043 dev_err(&port->dev, "%s - Error %d submitting "
1044 "interrupt urb\n", __func__, response);
1045 }
1046
1047 }
1048
1049 }
1050
1051 /* see if we've set up our endpoint info yet *
1052 * (can't set it up in mos7840_startup as the *
1053 * structures were not set up at that time.) */
1054
1055 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1056 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1057 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1058 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1059 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1060 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1061 mos7840_port->read_urb = port->read_urb;
1062
1063 /* set up our bulk in urb */
1064 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1065 usb_fill_bulk_urb(mos7840_port->read_urb,
1066 serial->dev,
1067 usb_rcvbulkpipe(serial->dev,
1068 (port->bulk_in_endpointAddress) + 2),
1069 port->bulk_in_buffer,
1070 mos7840_port->read_urb->transfer_buffer_length,
1071 mos7840_bulk_in_callback, mos7840_port);
1072 } else {
1073 usb_fill_bulk_urb(mos7840_port->read_urb,
1074 serial->dev,
1075 usb_rcvbulkpipe(serial->dev,
1076 port->bulk_in_endpointAddress),
1077 port->bulk_in_buffer,
1078 mos7840_port->read_urb->transfer_buffer_length,
1079 mos7840_bulk_in_callback, mos7840_port);
1080 }
1081
1082 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1083 mos7840_port->read_urb_busy = true;
1084 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1085 if (response) {
1086 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1087 __func__, response);
1088 mos7840_port->read_urb_busy = false;
1089 }
1090
1091 /* initialize our port settings */
1092 /* Must set to enable ints! */
1093 mos7840_port->shadowMCR = MCR_MASTER_IE;
1094 /* send a open port command */
1095 mos7840_port->open = 1;
1096 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1097
1098 return 0;
1099err:
1100 for (j = 0; j < NUM_URBS; ++j) {
1101 urb = mos7840_port->write_urb_pool[j];
1102 if (!urb)
1103 continue;
1104 kfree(urb->transfer_buffer);
1105 usb_free_urb(urb);
1106 }
1107 return status;
1108}
1109
1110/*****************************************************************************
1111 * mos7840_chars_in_buffer
1112 * this function is called by the tty driver when it wants to know how many
1113 * bytes of data we currently have outstanding in the port (data that has
1114 * been written, but hasn't made it out the port yet)
1115 * If successful, we return the number of bytes left to be written in the
1116 * system,
1117 * Otherwise we return zero.
1118 *****************************************************************************/
1119
1120static int mos7840_chars_in_buffer(struct tty_struct *tty)
1121{
1122 struct usb_serial_port *port = tty->driver_data;
1123 int i;
1124 int chars = 0;
1125 unsigned long flags;
1126 struct moschip_port *mos7840_port;
1127
1128 if (mos7840_port_paranoia_check(port, __func__))
1129 return 0;
1130
1131 mos7840_port = mos7840_get_port_private(port);
1132 if (mos7840_port == NULL)
1133 return 0;
1134
1135 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1136 for (i = 0; i < NUM_URBS; ++i) {
1137 if (mos7840_port->busy[i]) {
1138 struct urb *urb = mos7840_port->write_urb_pool[i];
1139 chars += urb->transfer_buffer_length;
1140 }
1141 }
1142 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1143 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1144 return chars;
1145
1146}
1147
1148/*****************************************************************************
1149 * mos7840_close
1150 * this function is called by the tty driver when a port is closed
1151 *****************************************************************************/
1152
1153static void mos7840_close(struct usb_serial_port *port)
1154{
1155 struct usb_serial *serial;
1156 struct moschip_port *mos7840_port;
1157 struct moschip_port *port0;
1158 int j;
1159 __u16 Data;
1160
1161 if (mos7840_port_paranoia_check(port, __func__))
1162 return;
1163
1164 serial = mos7840_get_usb_serial(port, __func__);
1165 if (!serial)
1166 return;
1167
1168 mos7840_port = mos7840_get_port_private(port);
1169 port0 = mos7840_get_port_private(serial->port[0]);
1170
1171 if (mos7840_port == NULL || port0 == NULL)
1172 return;
1173
1174 for (j = 0; j < NUM_URBS; ++j)
1175 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1176
1177 /* Freeing Write URBs */
1178 for (j = 0; j < NUM_URBS; ++j) {
1179 if (mos7840_port->write_urb_pool[j]) {
1180 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1181 usb_free_urb(mos7840_port->write_urb_pool[j]);
1182 }
1183 }
1184
1185 usb_kill_urb(mos7840_port->read_urb);
1186 mos7840_port->read_urb_busy = false;
1187
1188 port0->open_ports--;
1189 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1190 if (port0->open_ports == 0) {
1191 if (serial->port[0]->interrupt_in_urb) {
1192 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1193 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1194 }
1195 }
1196
1197 Data = 0x0;
1198 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1199
1200 Data = 0x00;
1201 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1202
1203 mos7840_port->open = 0;
1204}
1205
1206/*****************************************************************************
1207 * mos7840_break
1208 * this function sends a break to the port
1209 *****************************************************************************/
1210static void mos7840_break(struct tty_struct *tty, int break_state)
1211{
1212 struct usb_serial_port *port = tty->driver_data;
1213 unsigned char data;
1214 struct usb_serial *serial;
1215 struct moschip_port *mos7840_port;
1216
1217 if (mos7840_port_paranoia_check(port, __func__))
1218 return;
1219
1220 serial = mos7840_get_usb_serial(port, __func__);
1221 if (!serial)
1222 return;
1223
1224 mos7840_port = mos7840_get_port_private(port);
1225
1226 if (mos7840_port == NULL)
1227 return;
1228
1229 if (break_state == -1)
1230 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1231 else
1232 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1233
1234 /* FIXME: no locking on shadowLCR anywhere in driver */
1235 mos7840_port->shadowLCR = data;
1236 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1237 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1238 mos7840_port->shadowLCR);
1239}
1240
1241/*****************************************************************************
1242 * mos7840_write_room
1243 * this function is called by the tty driver when it wants to know how many
1244 * bytes of data we can accept for a specific port.
1245 * If successful, we return the amount of room that we have for this port
1246 * Otherwise we return a negative error number.
1247 *****************************************************************************/
1248
1249static int mos7840_write_room(struct tty_struct *tty)
1250{
1251 struct usb_serial_port *port = tty->driver_data;
1252 int i;
1253 int room = 0;
1254 unsigned long flags;
1255 struct moschip_port *mos7840_port;
1256
1257 if (mos7840_port_paranoia_check(port, __func__))
1258 return -1;
1259
1260 mos7840_port = mos7840_get_port_private(port);
1261 if (mos7840_port == NULL)
1262 return -1;
1263
1264 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1265 for (i = 0; i < NUM_URBS; ++i) {
1266 if (!mos7840_port->busy[i])
1267 room += URB_TRANSFER_BUFFER_SIZE;
1268 }
1269 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1270
1271 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1272 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1273 return room;
1274
1275}
1276
1277/*****************************************************************************
1278 * mos7840_write
1279 * this function is called by the tty driver when data should be written to
1280 * the port.
1281 * If successful, we return the number of bytes written, otherwise we
1282 * return a negative error number.
1283 *****************************************************************************/
1284
1285static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1286 const unsigned char *data, int count)
1287{
1288 int status;
1289 int i;
1290 int bytes_sent = 0;
1291 int transfer_size;
1292 unsigned long flags;
1293
1294 struct moschip_port *mos7840_port;
1295 struct usb_serial *serial;
1296 struct urb *urb;
1297 /* __u16 Data; */
1298 const unsigned char *current_position = data;
1299 unsigned char *data1;
1300
1301 if (mos7840_port_paranoia_check(port, __func__))
1302 return -1;
1303
1304 serial = port->serial;
1305 if (mos7840_serial_paranoia_check(serial, __func__))
1306 return -1;
1307
1308 mos7840_port = mos7840_get_port_private(port);
1309 if (mos7840_port == NULL)
1310 return -1;
1311
1312 /* try to find a free urb in the list */
1313 urb = NULL;
1314
1315 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1316 for (i = 0; i < NUM_URBS; ++i) {
1317 if (!mos7840_port->busy[i]) {
1318 mos7840_port->busy[i] = 1;
1319 urb = mos7840_port->write_urb_pool[i];
1320 dev_dbg(&port->dev, "URB:%d\n", i);
1321 break;
1322 }
1323 }
1324 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1325
1326 if (urb == NULL) {
1327 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1328 goto exit;
1329 }
1330
1331 if (urb->transfer_buffer == NULL) {
1332 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1333 GFP_ATOMIC);
1334 if (!urb->transfer_buffer)
1335 goto exit;
1336 }
1337 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1338
1339 memcpy(urb->transfer_buffer, current_position, transfer_size);
1340
1341 /* fill urb with data and submit */
1342 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1343 usb_fill_bulk_urb(urb,
1344 serial->dev,
1345 usb_sndbulkpipe(serial->dev,
1346 (port->bulk_out_endpointAddress) + 2),
1347 urb->transfer_buffer,
1348 transfer_size,
1349 mos7840_bulk_out_data_callback, mos7840_port);
1350 } else {
1351 usb_fill_bulk_urb(urb,
1352 serial->dev,
1353 usb_sndbulkpipe(serial->dev,
1354 port->bulk_out_endpointAddress),
1355 urb->transfer_buffer,
1356 transfer_size,
1357 mos7840_bulk_out_data_callback, mos7840_port);
1358 }
1359
1360 data1 = urb->transfer_buffer;
1361 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1362
1363 if (mos7840_port->has_led)
1364 mos7840_led_activity(port);
1365
1366 /* send it down the pipe */
1367 status = usb_submit_urb(urb, GFP_ATOMIC);
1368
1369 if (status) {
1370 mos7840_port->busy[i] = 0;
1371 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1372 "with status = %d\n", __func__, status);
1373 bytes_sent = status;
1374 goto exit;
1375 }
1376 bytes_sent = transfer_size;
1377 port->icount.tx += transfer_size;
1378 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1379exit:
1380 return bytes_sent;
1381
1382}
1383
1384/*****************************************************************************
1385 * mos7840_throttle
1386 * this function is called by the tty driver when it wants to stop the data
1387 * being read from the port.
1388 *****************************************************************************/
1389
1390static void mos7840_throttle(struct tty_struct *tty)
1391{
1392 struct usb_serial_port *port = tty->driver_data;
1393 struct moschip_port *mos7840_port;
1394 int status;
1395
1396 if (mos7840_port_paranoia_check(port, __func__))
1397 return;
1398
1399 mos7840_port = mos7840_get_port_private(port);
1400
1401 if (mos7840_port == NULL)
1402 return;
1403
1404 if (!mos7840_port->open) {
1405 dev_dbg(&port->dev, "%s", "port not opened\n");
1406 return;
1407 }
1408
1409 /* if we are implementing XON/XOFF, send the stop character */
1410 if (I_IXOFF(tty)) {
1411 unsigned char stop_char = STOP_CHAR(tty);
1412 status = mos7840_write(tty, port, &stop_char, 1);
1413 if (status <= 0)
1414 return;
1415 }
1416 /* if we are implementing RTS/CTS, toggle that line */
1417 if (C_CRTSCTS(tty)) {
1418 mos7840_port->shadowMCR &= ~MCR_RTS;
1419 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1420 mos7840_port->shadowMCR);
1421 if (status < 0)
1422 return;
1423 }
1424}
1425
1426/*****************************************************************************
1427 * mos7840_unthrottle
1428 * this function is called by the tty driver when it wants to resume
1429 * the data being read from the port (called after mos7840_throttle is
1430 * called)
1431 *****************************************************************************/
1432static void mos7840_unthrottle(struct tty_struct *tty)
1433{
1434 struct usb_serial_port *port = tty->driver_data;
1435 int status;
1436 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1437
1438 if (mos7840_port_paranoia_check(port, __func__))
1439 return;
1440
1441 if (mos7840_port == NULL)
1442 return;
1443
1444 if (!mos7840_port->open) {
1445 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1446 return;
1447 }
1448
1449 /* if we are implementing XON/XOFF, send the start character */
1450 if (I_IXOFF(tty)) {
1451 unsigned char start_char = START_CHAR(tty);
1452 status = mos7840_write(tty, port, &start_char, 1);
1453 if (status <= 0)
1454 return;
1455 }
1456
1457 /* if we are implementing RTS/CTS, toggle that line */
1458 if (C_CRTSCTS(tty)) {
1459 mos7840_port->shadowMCR |= MCR_RTS;
1460 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1461 mos7840_port->shadowMCR);
1462 if (status < 0)
1463 return;
1464 }
1465}
1466
1467static int mos7840_tiocmget(struct tty_struct *tty)
1468{
1469 struct usb_serial_port *port = tty->driver_data;
1470 struct moschip_port *mos7840_port;
1471 unsigned int result;
1472 __u16 msr;
1473 __u16 mcr;
1474 int status;
1475 mos7840_port = mos7840_get_port_private(port);
1476
1477 if (mos7840_port == NULL)
1478 return -ENODEV;
1479
1480 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1481 if (status < 0)
1482 return -EIO;
1483 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1484 if (status < 0)
1485 return -EIO;
1486 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1487 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1488 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1489 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1490 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1491 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1492 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1493
1494 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1495
1496 return result;
1497}
1498
1499static int mos7840_tiocmset(struct tty_struct *tty,
1500 unsigned int set, unsigned int clear)
1501{
1502 struct usb_serial_port *port = tty->driver_data;
1503 struct moschip_port *mos7840_port;
1504 unsigned int mcr;
1505 int status;
1506
1507 mos7840_port = mos7840_get_port_private(port);
1508
1509 if (mos7840_port == NULL)
1510 return -ENODEV;
1511
1512 /* FIXME: What locks the port registers ? */
1513 mcr = mos7840_port->shadowMCR;
1514 if (clear & TIOCM_RTS)
1515 mcr &= ~MCR_RTS;
1516 if (clear & TIOCM_DTR)
1517 mcr &= ~MCR_DTR;
1518 if (clear & TIOCM_LOOP)
1519 mcr &= ~MCR_LOOPBACK;
1520
1521 if (set & TIOCM_RTS)
1522 mcr |= MCR_RTS;
1523 if (set & TIOCM_DTR)
1524 mcr |= MCR_DTR;
1525 if (set & TIOCM_LOOP)
1526 mcr |= MCR_LOOPBACK;
1527
1528 mos7840_port->shadowMCR = mcr;
1529
1530 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1531 if (status < 0) {
1532 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1533 return status;
1534 }
1535
1536 return 0;
1537}
1538
1539/*****************************************************************************
1540 * mos7840_calc_baud_rate_divisor
1541 * this function calculates the proper baud rate divisor for the specified
1542 * baud rate.
1543 *****************************************************************************/
1544static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1545 int baudRate, int *divisor,
1546 __u16 *clk_sel_val)
1547{
1548 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1549
1550 if (baudRate <= 115200) {
1551 *divisor = 115200 / baudRate;
1552 *clk_sel_val = 0x0;
1553 }
1554 if ((baudRate > 115200) && (baudRate <= 230400)) {
1555 *divisor = 230400 / baudRate;
1556 *clk_sel_val = 0x10;
1557 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1558 *divisor = 403200 / baudRate;
1559 *clk_sel_val = 0x20;
1560 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1561 *divisor = 460800 / baudRate;
1562 *clk_sel_val = 0x30;
1563 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1564 *divisor = 806400 / baudRate;
1565 *clk_sel_val = 0x40;
1566 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1567 *divisor = 921600 / baudRate;
1568 *clk_sel_val = 0x50;
1569 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1570 *divisor = 1572864 / baudRate;
1571 *clk_sel_val = 0x60;
1572 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1573 *divisor = 3145728 / baudRate;
1574 *clk_sel_val = 0x70;
1575 }
1576 return 0;
1577}
1578
1579/*****************************************************************************
1580 * mos7840_send_cmd_write_baud_rate
1581 * this function sends the proper command to change the baud rate of the
1582 * specified port.
1583 *****************************************************************************/
1584
1585static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1586 int baudRate)
1587{
1588 int divisor = 0;
1589 int status;
1590 __u16 Data;
1591 unsigned char number;
1592 __u16 clk_sel_val;
1593 struct usb_serial_port *port;
1594
1595 if (mos7840_port == NULL)
1596 return -1;
1597
1598 port = mos7840_port->port;
1599 if (mos7840_port_paranoia_check(port, __func__))
1600 return -1;
1601
1602 if (mos7840_serial_paranoia_check(port->serial, __func__))
1603 return -1;
1604
1605 number = mos7840_port->port->port_number;
1606
1607 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1608 /* reset clk_uart_sel in spregOffset */
1609 if (baudRate > 115200) {
1610#ifdef HW_flow_control
1611 /* NOTE: need to see the pther register to modify */
1612 /* setting h/w flow control bit to 1 */
1613 Data = 0x2b;
1614 mos7840_port->shadowMCR = Data;
1615 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1616 Data);
1617 if (status < 0) {
1618 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1619 return -1;
1620 }
1621#endif
1622
1623 } else {
1624#ifdef HW_flow_control
1625 /* setting h/w flow control bit to 0 */
1626 Data = 0xb;
1627 mos7840_port->shadowMCR = Data;
1628 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1629 Data);
1630 if (status < 0) {
1631 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1632 return -1;
1633 }
1634#endif
1635
1636 }
1637
1638 if (1) { /* baudRate <= 115200) */
1639 clk_sel_val = 0x0;
1640 Data = 0x0;
1641 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1642 &clk_sel_val);
1643 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1644 &Data);
1645 if (status < 0) {
1646 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1647 return -1;
1648 }
1649 Data = (Data & 0x8f) | clk_sel_val;
1650 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1651 Data);
1652 if (status < 0) {
1653 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1654 return -1;
1655 }
1656 /* Calculate the Divisor */
1657
1658 if (status) {
1659 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1660 return status;
1661 }
1662 /* Enable access to divisor latch */
1663 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1664 mos7840_port->shadowLCR = Data;
1665 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1666
1667 /* Write the divisor */
1668 Data = (unsigned char)(divisor & 0xff);
1669 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1670 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1671
1672 Data = (unsigned char)((divisor & 0xff00) >> 8);
1673 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1674 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1675
1676 /* Disable access to divisor latch */
1677 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1678 mos7840_port->shadowLCR = Data;
1679 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1680
1681 }
1682 return status;
1683}
1684
1685/*****************************************************************************
1686 * mos7840_change_port_settings
1687 * This routine is called to set the UART on the device to match
1688 * the specified new settings.
1689 *****************************************************************************/
1690
1691static void mos7840_change_port_settings(struct tty_struct *tty,
1692 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1693{
1694 int baud;
1695 unsigned cflag;
1696 unsigned iflag;
1697 __u8 lData;
1698 __u8 lParity;
1699 __u8 lStop;
1700 int status;
1701 __u16 Data;
1702 struct usb_serial_port *port;
1703 struct usb_serial *serial;
1704
1705 if (mos7840_port == NULL)
1706 return;
1707
1708 port = mos7840_port->port;
1709
1710 if (mos7840_port_paranoia_check(port, __func__))
1711 return;
1712
1713 if (mos7840_serial_paranoia_check(port->serial, __func__))
1714 return;
1715
1716 serial = port->serial;
1717
1718 if (!mos7840_port->open) {
1719 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1720 return;
1721 }
1722
1723 lData = LCR_BITS_8;
1724 lStop = LCR_STOP_1;
1725 lParity = LCR_PAR_NONE;
1726
1727 cflag = tty->termios.c_cflag;
1728 iflag = tty->termios.c_iflag;
1729
1730 /* Change the number of bits */
1731 switch (cflag & CSIZE) {
1732 case CS5:
1733 lData = LCR_BITS_5;
1734 break;
1735
1736 case CS6:
1737 lData = LCR_BITS_6;
1738 break;
1739
1740 case CS7:
1741 lData = LCR_BITS_7;
1742 break;
1743
1744 default:
1745 case CS8:
1746 lData = LCR_BITS_8;
1747 break;
1748 }
1749
1750 /* Change the Parity bit */
1751 if (cflag & PARENB) {
1752 if (cflag & PARODD) {
1753 lParity = LCR_PAR_ODD;
1754 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1755 } else {
1756 lParity = LCR_PAR_EVEN;
1757 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1758 }
1759
1760 } else {
1761 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1762 }
1763
1764 if (cflag & CMSPAR)
1765 lParity = lParity | 0x20;
1766
1767 /* Change the Stop bit */
1768 if (cflag & CSTOPB) {
1769 lStop = LCR_STOP_2;
1770 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1771 } else {
1772 lStop = LCR_STOP_1;
1773 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1774 }
1775
1776 /* Update the LCR with the correct value */
1777 mos7840_port->shadowLCR &=
1778 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1779 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1780
1781 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1782 mos7840_port->shadowLCR);
1783 /* Disable Interrupts */
1784 Data = 0x00;
1785 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1786
1787 Data = 0x00;
1788 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1789
1790 Data = 0xcf;
1791 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1792
1793 /* Send the updated LCR value to the mos7840 */
1794 Data = mos7840_port->shadowLCR;
1795
1796 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1797
1798 Data = 0x00b;
1799 mos7840_port->shadowMCR = Data;
1800 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1801 Data = 0x00b;
1802 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1803
1804 /* set up the MCR register and send it to the mos7840 */
1805
1806 mos7840_port->shadowMCR = MCR_MASTER_IE;
1807 if (cflag & CBAUD)
1808 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1809
1810 if (cflag & CRTSCTS)
1811 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1812 else
1813 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1814
1815 Data = mos7840_port->shadowMCR;
1816 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1817
1818 /* Determine divisor based on baud rate */
1819 baud = tty_get_baud_rate(tty);
1820
1821 if (!baud) {
1822 /* pick a default, any default... */
1823 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1824 baud = 9600;
1825 }
1826
1827 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1828 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1829
1830 /* Enable Interrupts */
1831 Data = 0x0c;
1832 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1833
1834 if (!mos7840_port->read_urb_busy) {
1835 mos7840_port->read_urb_busy = true;
1836 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1837 if (status) {
1838 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1839 status);
1840 mos7840_port->read_urb_busy = false;
1841 }
1842 }
1843 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1844 mos7840_port->shadowLCR);
1845}
1846
1847/*****************************************************************************
1848 * mos7840_set_termios
1849 * this function is called by the tty driver when it wants to change
1850 * the termios structure
1851 *****************************************************************************/
1852
1853static void mos7840_set_termios(struct tty_struct *tty,
1854 struct usb_serial_port *port,
1855 struct ktermios *old_termios)
1856{
1857 int status;
1858 struct usb_serial *serial;
1859 struct moschip_port *mos7840_port;
1860
1861 if (mos7840_port_paranoia_check(port, __func__))
1862 return;
1863
1864 serial = port->serial;
1865
1866 if (mos7840_serial_paranoia_check(serial, __func__))
1867 return;
1868
1869 mos7840_port = mos7840_get_port_private(port);
1870
1871 if (mos7840_port == NULL)
1872 return;
1873
1874 if (!mos7840_port->open) {
1875 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1876 return;
1877 }
1878
1879 /* change the port settings to the new ones specified */
1880
1881 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1882
1883 if (!mos7840_port->read_urb) {
1884 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1885 return;
1886 }
1887
1888 if (!mos7840_port->read_urb_busy) {
1889 mos7840_port->read_urb_busy = true;
1890 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1891 if (status) {
1892 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1893 status);
1894 mos7840_port->read_urb_busy = false;
1895 }
1896 }
1897}
1898
1899/*****************************************************************************
1900 * mos7840_get_lsr_info - get line status register info
1901 *
1902 * Purpose: Let user call ioctl() to get info when the UART physically
1903 * is emptied. On bus types like RS485, the transmitter must
1904 * release the bus after transmitting. This must be done when
1905 * the transmit shift register is empty, not be done when the
1906 * transmit holding register is empty. This functionality
1907 * allows an RS485 driver to be written in user space.
1908 *****************************************************************************/
1909
1910static int mos7840_get_lsr_info(struct tty_struct *tty,
1911 unsigned int __user *value)
1912{
1913 int count;
1914 unsigned int result = 0;
1915
1916 count = mos7840_chars_in_buffer(tty);
1917 if (count == 0)
1918 result = TIOCSER_TEMT;
1919
1920 if (copy_to_user(value, &result, sizeof(int)))
1921 return -EFAULT;
1922 return 0;
1923}
1924
1925/*****************************************************************************
1926 * mos7840_get_serial_info
1927 * function to get information about serial port
1928 *****************************************************************************/
1929
1930static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1931 struct serial_struct __user *retinfo)
1932{
1933 struct serial_struct tmp;
1934
1935 if (mos7840_port == NULL)
1936 return -1;
1937
1938 memset(&tmp, 0, sizeof(tmp));
1939
1940 tmp.type = PORT_16550A;
1941 tmp.line = mos7840_port->port->minor;
1942 tmp.port = mos7840_port->port->port_number;
1943 tmp.irq = 0;
1944 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1945 tmp.baud_base = 9600;
1946 tmp.close_delay = 5 * HZ;
1947 tmp.closing_wait = 30 * HZ;
1948
1949 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1950 return -EFAULT;
1951 return 0;
1952}
1953
1954/*****************************************************************************
1955 * SerialIoctl
1956 * this function handles any ioctl calls to the driver
1957 *****************************************************************************/
1958
1959static int mos7840_ioctl(struct tty_struct *tty,
1960 unsigned int cmd, unsigned long arg)
1961{
1962 struct usb_serial_port *port = tty->driver_data;
1963 void __user *argp = (void __user *)arg;
1964 struct moschip_port *mos7840_port;
1965
1966 if (mos7840_port_paranoia_check(port, __func__))
1967 return -1;
1968
1969 mos7840_port = mos7840_get_port_private(port);
1970
1971 if (mos7840_port == NULL)
1972 return -1;
1973
1974 switch (cmd) {
1975 /* return number of bytes available */
1976
1977 case TIOCSERGETLSR:
1978 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1979 return mos7840_get_lsr_info(tty, argp);
1980
1981 case TIOCGSERIAL:
1982 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1983 return mos7840_get_serial_info(mos7840_port, argp);
1984
1985 case TIOCSSERIAL:
1986 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
1987 break;
1988 default:
1989 break;
1990 }
1991 return -ENOIOCTLCMD;
1992}
1993
1994static int mos7810_check(struct usb_serial *serial)
1995{
1996 int i, pass_count = 0;
1997 u8 *buf;
1998 __u16 data = 0, mcr_data = 0;
1999 __u16 test_pattern = 0x55AA;
2000 int res;
2001
2002 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2003 if (!buf)
2004 return 0; /* failed to identify 7810 */
2005
2006 /* Store MCR setting */
2007 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2008 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2009 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2010 if (res == VENDOR_READ_LENGTH)
2011 mcr_data = *buf;
2012
2013 for (i = 0; i < 16; i++) {
2014 /* Send the 1-bit test pattern out to MCS7810 test pin */
2015 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2016 MCS_WRREQ, MCS_WR_RTYPE,
2017 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2018 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2019
2020 /* Read the test pattern back */
2021 res = usb_control_msg(serial->dev,
2022 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2023 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2024 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2025 if (res == VENDOR_READ_LENGTH)
2026 data = *buf;
2027
2028 /* If this is a MCS7810 device, both test patterns must match */
2029 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2030 break;
2031
2032 pass_count++;
2033 }
2034
2035 /* Restore MCR setting */
2036 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2037 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2038 0, MOS_WDR_TIMEOUT);
2039
2040 kfree(buf);
2041
2042 if (pass_count == 16)
2043 return 1;
2044
2045 return 0;
2046}
2047
2048static int mos7840_probe(struct usb_serial *serial,
2049 const struct usb_device_id *id)
2050{
2051 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2052 u8 *buf;
2053 int device_type;
2054
2055 if (product == MOSCHIP_DEVICE_ID_7810 ||
2056 product == MOSCHIP_DEVICE_ID_7820) {
2057 device_type = product;
2058 goto out;
2059 }
2060
2061 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2062 if (!buf)
2063 return -ENOMEM;
2064
2065 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2066 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2067 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2068
2069 /* For a MCS7840 device GPIO0 must be set to 1 */
2070 if (buf[0] & 0x01)
2071 device_type = MOSCHIP_DEVICE_ID_7840;
2072 else if (mos7810_check(serial))
2073 device_type = MOSCHIP_DEVICE_ID_7810;
2074 else
2075 device_type = MOSCHIP_DEVICE_ID_7820;
2076
2077 kfree(buf);
2078out:
2079 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2080
2081 return 0;
2082}
2083
2084static int mos7840_calc_num_ports(struct usb_serial *serial,
2085 struct usb_serial_endpoints *epds)
2086{
2087 int device_type = (unsigned long)usb_get_serial_data(serial);
2088 int num_ports;
2089
2090 num_ports = (device_type >> 4) & 0x000F;
2091
2092 /*
2093 * num_ports is currently never zero as device_type is one of
2094 * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2095 */
2096 if (num_ports == 0)
2097 return -ENODEV;
2098
2099 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2100 dev_err(&serial->interface->dev, "missing endpoints\n");
2101 return -ENODEV;
2102 }
2103
2104 return num_ports;
2105}
2106
2107static int mos7840_port_probe(struct usb_serial_port *port)
2108{
2109 struct usb_serial *serial = port->serial;
2110 int device_type = (unsigned long)usb_get_serial_data(serial);
2111 struct moschip_port *mos7840_port;
2112 int status;
2113 int pnum;
2114 __u16 Data;
2115
2116 /* we set up the pointers to the endpoints in the mos7840_open *
2117 * function, as the structures aren't created yet. */
2118
2119 pnum = port->port_number;
2120
2121 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2122 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2123 if (!mos7840_port)
2124 return -ENOMEM;
2125
2126 /* Initialize all port interrupt end point to port 0 int
2127 * endpoint. Our device has only one interrupt end point
2128 * common to all port */
2129
2130 mos7840_port->port = port;
2131 mos7840_set_port_private(port, mos7840_port);
2132 spin_lock_init(&mos7840_port->pool_lock);
2133
2134 /* minor is not initialised until later by
2135 * usb-serial.c:get_free_serial() and cannot therefore be used
2136 * to index device instances */
2137 mos7840_port->port_num = pnum + 1;
2138 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2139 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2140
2141 if (mos7840_port->port_num == 1) {
2142 mos7840_port->SpRegOffset = 0x0;
2143 mos7840_port->ControlRegOffset = 0x1;
2144 mos7840_port->DcrRegOffset = 0x4;
2145 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2146 mos7840_port->SpRegOffset = 0x8;
2147 mos7840_port->ControlRegOffset = 0x9;
2148 mos7840_port->DcrRegOffset = 0x16;
2149 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2150 mos7840_port->SpRegOffset = 0xa;
2151 mos7840_port->ControlRegOffset = 0xb;
2152 mos7840_port->DcrRegOffset = 0x19;
2153 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2154 mos7840_port->SpRegOffset = 0xa;
2155 mos7840_port->ControlRegOffset = 0xb;
2156 mos7840_port->DcrRegOffset = 0x19;
2157 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2158 mos7840_port->SpRegOffset = 0xc;
2159 mos7840_port->ControlRegOffset = 0xd;
2160 mos7840_port->DcrRegOffset = 0x1c;
2161 }
2162 mos7840_dump_serial_port(port, mos7840_port);
2163 mos7840_set_port_private(port, mos7840_port);
2164
2165 /* enable rx_disable bit in control register */
2166 status = mos7840_get_reg_sync(port,
2167 mos7840_port->ControlRegOffset, &Data);
2168 if (status < 0) {
2169 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2170 goto out;
2171 } else
2172 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2173 Data |= 0x08; /* setting driver done bit */
2174 Data |= 0x04; /* sp1_bit to have cts change reflect in
2175 modem status reg */
2176
2177 /* Data |= 0x20; //rx_disable bit */
2178 status = mos7840_set_reg_sync(port,
2179 mos7840_port->ControlRegOffset, Data);
2180 if (status < 0) {
2181 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2182 goto out;
2183 } else
2184 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2185
2186 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2187 and 0x24 in DCR3 */
2188 Data = 0x01;
2189 status = mos7840_set_reg_sync(port,
2190 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2191 if (status < 0) {
2192 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2193 goto out;
2194 } else
2195 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2196
2197 Data = 0x05;
2198 status = mos7840_set_reg_sync(port,
2199 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2200 if (status < 0) {
2201 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2202 goto out;
2203 } else
2204 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2205
2206 Data = 0x24;
2207 status = mos7840_set_reg_sync(port,
2208 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2209 if (status < 0) {
2210 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2211 goto out;
2212 } else
2213 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2214
2215 /* write values in clkstart0x0 and clkmulti 0x20 */
2216 Data = 0x0;
2217 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2218 if (status < 0) {
2219 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2220 goto out;
2221 } else
2222 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2223
2224 Data = 0x20;
2225 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2226 if (status < 0) {
2227 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2228 goto error;
2229 } else
2230 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2231
2232 /* write value 0x0 to scratchpad register */
2233 Data = 0x00;
2234 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2235 if (status < 0) {
2236 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2237 goto out;
2238 } else
2239 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2240
2241 /* Zero Length flag register */
2242 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2243 Data = 0xff;
2244 status = mos7840_set_reg_sync(port,
2245 (__u16) (ZLP_REG1 +
2246 ((__u16)mos7840_port->port_num)), Data);
2247 dev_dbg(&port->dev, "ZLIP offset %x\n",
2248 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2249 if (status < 0) {
2250 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2251 goto out;
2252 } else
2253 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2254 } else {
2255 Data = 0xff;
2256 status = mos7840_set_reg_sync(port,
2257 (__u16) (ZLP_REG1 +
2258 ((__u16)mos7840_port->port_num) - 0x1), Data);
2259 dev_dbg(&port->dev, "ZLIP offset %x\n",
2260 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2261 if (status < 0) {
2262 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2263 goto out;
2264 } else
2265 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2266
2267 }
2268 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2269 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2270 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2271 GFP_KERNEL);
2272 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2273 !mos7840_port->dr) {
2274 status = -ENOMEM;
2275 goto error;
2276 }
2277
2278 mos7840_port->has_led = false;
2279
2280 /* Initialize LED timers */
2281 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2282 mos7840_port->has_led = true;
2283
2284 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2285 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2286 GFP_KERNEL);
2287 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2288 status = -ENOMEM;
2289 goto error;
2290 }
2291
2292 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
2293 mos7840_port->led_timer1.expires =
2294 jiffies + msecs_to_jiffies(LED_ON_MS);
2295 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
2296 0);
2297 mos7840_port->led_timer2.expires =
2298 jiffies + msecs_to_jiffies(LED_OFF_MS);
2299
2300 /* Turn off LED */
2301 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2302 }
2303out:
2304 if (pnum == serial->num_ports - 1) {
2305 /* Zero Length flag enable */
2306 Data = 0x0f;
2307 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2308 if (status < 0) {
2309 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2310 goto error;
2311 } else
2312 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2313
2314 /* setting configuration feature to one */
2315 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2316 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2317 MOS_WDR_TIMEOUT);
2318 }
2319 return 0;
2320error:
2321 kfree(mos7840_port->led_dr);
2322 usb_free_urb(mos7840_port->led_urb);
2323 kfree(mos7840_port->dr);
2324 kfree(mos7840_port->ctrl_buf);
2325 usb_free_urb(mos7840_port->control_urb);
2326 kfree(mos7840_port);
2327
2328 return status;
2329}
2330
2331static int mos7840_port_remove(struct usb_serial_port *port)
2332{
2333 struct moschip_port *mos7840_port;
2334
2335 mos7840_port = mos7840_get_port_private(port);
2336
2337 if (mos7840_port->has_led) {
2338 /* Turn off LED */
2339 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2340
2341 del_timer_sync(&mos7840_port->led_timer1);
2342 del_timer_sync(&mos7840_port->led_timer2);
2343
2344 usb_kill_urb(mos7840_port->led_urb);
2345 usb_free_urb(mos7840_port->led_urb);
2346 kfree(mos7840_port->led_dr);
2347 }
2348 usb_kill_urb(mos7840_port->control_urb);
2349 usb_free_urb(mos7840_port->control_urb);
2350 kfree(mos7840_port->ctrl_buf);
2351 kfree(mos7840_port->dr);
2352 kfree(mos7840_port);
2353
2354 return 0;
2355}
2356
2357static struct usb_serial_driver moschip7840_4port_device = {
2358 .driver = {
2359 .owner = THIS_MODULE,
2360 .name = "mos7840",
2361 },
2362 .description = DRIVER_DESC,
2363 .id_table = id_table,
2364 .num_interrupt_in = 1,
2365 .open = mos7840_open,
2366 .close = mos7840_close,
2367 .write = mos7840_write,
2368 .write_room = mos7840_write_room,
2369 .chars_in_buffer = mos7840_chars_in_buffer,
2370 .throttle = mos7840_throttle,
2371 .unthrottle = mos7840_unthrottle,
2372 .calc_num_ports = mos7840_calc_num_ports,
2373 .probe = mos7840_probe,
2374 .ioctl = mos7840_ioctl,
2375 .set_termios = mos7840_set_termios,
2376 .break_ctl = mos7840_break,
2377 .tiocmget = mos7840_tiocmget,
2378 .tiocmset = mos7840_tiocmset,
2379 .tiocmiwait = usb_serial_generic_tiocmiwait,
2380 .get_icount = usb_serial_generic_get_icount,
2381 .port_probe = mos7840_port_probe,
2382 .port_remove = mos7840_port_remove,
2383 .read_bulk_callback = mos7840_bulk_in_callback,
2384 .read_int_callback = mos7840_interrupt_callback,
2385};
2386
2387static struct usb_serial_driver * const serial_drivers[] = {
2388 &moschip7840_4port_device, NULL
2389};
2390
2391module_usb_serial_driver(serial_drivers, id_table);
2392
2393MODULE_DESCRIPTION(DRIVER_DESC);
2394MODULE_LICENSE("GPL");