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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Prolific PL2303 USB to serial adaptor driver
4 *
5 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2003 IBM Corp.
7 *
8 * Original driver for 2.2.x by anonymous
9 *
10 * See Documentation/usb/usb-serial.rst for more information on using this
11 * driver
12 */
13
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/tty.h>
18#include <linux/tty_driver.h>
19#include <linux/tty_flip.h>
20#include <linux/serial.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/spinlock.h>
24#include <linux/uaccess.h>
25#include <linux/usb.h>
26#include <linux/usb/serial.h>
27#include <linux/unaligned.h>
28#include "pl2303.h"
29
30
31#define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
32#define PL2303_QUIRK_LEGACY BIT(1)
33#define PL2303_QUIRK_ENDPOINT_HACK BIT(2)
34#define PL2303_QUIRK_NO_BREAK_GETLINE BIT(3)
35
36static const struct usb_device_id id_table[] = {
37 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
38 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
49 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
50 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
51 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
52 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
54 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
56 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
57 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
58 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
59 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
60 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
61 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
62 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
63 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
64 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
65 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
66 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
67 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
68 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
69 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
70 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
71 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
72 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
73 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
74 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
75 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
76 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
77 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
78 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
79 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
80 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
81 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
82 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
83 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
84 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
85 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
86 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
87 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
88 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
89 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
90 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
91 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
92 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
93 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
94 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
95 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
96 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
97 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
98 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
99 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
100 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
101 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
102 { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
103 { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
104 { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
105 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
106 { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
107 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
108 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
109 { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
110 { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) },
111 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
112 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
113 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
114 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
115 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
116 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
117 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
118 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
119 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
120 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
121 { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
122 { USB_DEVICE(MACROSILICON_VENDOR_ID, MACROSILICON_MS3020_PRODUCT_ID) },
123 { } /* Terminating entry */
124};
125
126MODULE_DEVICE_TABLE(usb, id_table);
127
128#define SET_LINE_REQUEST_TYPE 0x21
129#define SET_LINE_REQUEST 0x20
130
131#define SET_CONTROL_REQUEST_TYPE 0x21
132#define SET_CONTROL_REQUEST 0x22
133#define CONTROL_DTR 0x01
134#define CONTROL_RTS 0x02
135
136#define BREAK_REQUEST_TYPE 0x21
137#define BREAK_REQUEST 0x23
138#define BREAK_ON 0xffff
139#define BREAK_OFF 0x0000
140
141#define GET_LINE_REQUEST_TYPE 0xa1
142#define GET_LINE_REQUEST 0x21
143
144#define VENDOR_WRITE_REQUEST_TYPE 0x40
145#define VENDOR_WRITE_REQUEST 0x01
146#define VENDOR_WRITE_NREQUEST 0x80
147
148#define VENDOR_READ_REQUEST_TYPE 0xc0
149#define VENDOR_READ_REQUEST 0x01
150#define VENDOR_READ_NREQUEST 0x81
151
152#define UART_STATE_INDEX 8
153#define UART_STATE_MSR_MASK 0x8b
154#define UART_STATE_TRANSIENT_MASK 0x74
155#define UART_DCD 0x01
156#define UART_DSR 0x02
157#define UART_BREAK_ERROR 0x04
158#define UART_RING 0x08
159#define UART_FRAME_ERROR 0x10
160#define UART_PARITY_ERROR 0x20
161#define UART_OVERRUN_ERROR 0x40
162#define UART_CTS 0x80
163
164#define PL2303_FLOWCTRL_MASK 0xf0
165
166#define PL2303_READ_TYPE_HX_STATUS 0x8080
167
168#define PL2303_HXN_RESET_REG 0x07
169#define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02
170#define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01
171
172#define PL2303_HXN_FLOWCTRL_REG 0x0a
173#define PL2303_HXN_FLOWCTRL_MASK 0x1c
174#define PL2303_HXN_FLOWCTRL_NONE 0x1c
175#define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18
176#define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c
177
178static int pl2303_set_break(struct usb_serial_port *port, bool enable);
179
180enum pl2303_type {
181 TYPE_H,
182 TYPE_HX,
183 TYPE_TA,
184 TYPE_TB,
185 TYPE_HXD,
186 TYPE_HXN,
187 TYPE_COUNT
188};
189
190struct pl2303_type_data {
191 const char *name;
192 speed_t max_baud_rate;
193 unsigned long quirks;
194 unsigned int no_autoxonxoff:1;
195 unsigned int no_divisors:1;
196 unsigned int alt_divisors:1;
197};
198
199struct pl2303_serial_private {
200 const struct pl2303_type_data *type;
201 unsigned long quirks;
202};
203
204struct pl2303_private {
205 spinlock_t lock;
206 u8 line_control;
207 u8 line_status;
208
209 u8 line_settings[7];
210};
211
212static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
213 [TYPE_H] = {
214 .name = "H",
215 .max_baud_rate = 1228800,
216 .quirks = PL2303_QUIRK_LEGACY,
217 .no_autoxonxoff = true,
218 },
219 [TYPE_HX] = {
220 .name = "HX",
221 .max_baud_rate = 6000000,
222 },
223 [TYPE_TA] = {
224 .name = "TA",
225 .max_baud_rate = 6000000,
226 .alt_divisors = true,
227 },
228 [TYPE_TB] = {
229 .name = "TB",
230 .max_baud_rate = 12000000,
231 .alt_divisors = true,
232 },
233 [TYPE_HXD] = {
234 .name = "HXD",
235 .max_baud_rate = 12000000,
236 },
237 [TYPE_HXN] = {
238 .name = "G",
239 .max_baud_rate = 12000000,
240 .no_divisors = true,
241 },
242};
243
244static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
245 unsigned char buf[1])
246{
247 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
248 struct device *dev = &serial->interface->dev;
249 u8 request;
250 int res;
251
252 if (spriv->type == &pl2303_type_data[TYPE_HXN])
253 request = VENDOR_READ_NREQUEST;
254 else
255 request = VENDOR_READ_REQUEST;
256
257 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
258 request, VENDOR_READ_REQUEST_TYPE,
259 value, 0, buf, 1, 100);
260 if (res != 1) {
261 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
262 value, res);
263 if (res >= 0)
264 res = -EIO;
265
266 return res;
267 }
268
269 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
270
271 return 0;
272}
273
274static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
275{
276 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
277 struct device *dev = &serial->interface->dev;
278 u8 request;
279 int res;
280
281 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
282
283 if (spriv->type == &pl2303_type_data[TYPE_HXN])
284 request = VENDOR_WRITE_NREQUEST;
285 else
286 request = VENDOR_WRITE_REQUEST;
287
288 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
289 request, VENDOR_WRITE_REQUEST_TYPE,
290 value, index, NULL, 0, 100);
291 if (res) {
292 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
293 value, res);
294 return res;
295 }
296
297 return 0;
298}
299
300static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
301{
302 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
303 int ret = 0;
304 u8 *buf;
305
306 buf = kmalloc(1, GFP_KERNEL);
307 if (!buf)
308 return -ENOMEM;
309
310 if (spriv->type == &pl2303_type_data[TYPE_HXN])
311 ret = pl2303_vendor_read(serial, reg, buf);
312 else
313 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
314
315 if (ret)
316 goto out_free;
317
318 *buf &= ~mask;
319 *buf |= val & mask;
320
321 ret = pl2303_vendor_write(serial, reg, *buf);
322out_free:
323 kfree(buf);
324
325 return ret;
326}
327
328static int pl2303_probe(struct usb_serial *serial,
329 const struct usb_device_id *id)
330{
331 usb_set_serial_data(serial, (void *)id->driver_info);
332
333 return 0;
334}
335
336/*
337 * Use interrupt endpoint from first interface if available.
338 *
339 * This is needed due to the looney way its endpoints are set up.
340 */
341static int pl2303_endpoint_hack(struct usb_serial *serial,
342 struct usb_serial_endpoints *epds)
343{
344 struct usb_interface *interface = serial->interface;
345 struct usb_device *dev = serial->dev;
346 struct device *ddev = &interface->dev;
347 struct usb_host_interface *iface_desc;
348 struct usb_endpoint_descriptor *endpoint;
349 unsigned int i;
350
351 if (interface == dev->actconfig->interface[0])
352 return 0;
353
354 /* check out the endpoints of the other interface */
355 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
356
357 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
358 endpoint = &iface_desc->endpoint[i].desc;
359
360 if (!usb_endpoint_is_int_in(endpoint))
361 continue;
362
363 dev_dbg(ddev, "found interrupt in on separate interface\n");
364 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
365 epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
366 }
367
368 return 0;
369}
370
371static int pl2303_calc_num_ports(struct usb_serial *serial,
372 struct usb_serial_endpoints *epds)
373{
374 unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
375 struct device *dev = &serial->interface->dev;
376 int ret;
377
378 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
379 ret = pl2303_endpoint_hack(serial, epds);
380 if (ret)
381 return ret;
382 }
383
384 if (epds->num_interrupt_in < 1) {
385 dev_err(dev, "required interrupt-in endpoint missing\n");
386 return -ENODEV;
387 }
388
389 return 1;
390}
391
392static bool pl2303_supports_hx_status(struct usb_serial *serial)
393{
394 int ret;
395 u8 buf;
396
397 ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
398 VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
399 0, &buf, 1, 100, GFP_KERNEL);
400
401 return ret == 0;
402}
403
404static int pl2303_detect_type(struct usb_serial *serial)
405{
406 struct usb_device_descriptor *desc = &serial->dev->descriptor;
407 u16 bcdDevice, bcdUSB;
408
409 /*
410 * Legacy PL2303H, variants 0 and 1 (difference unknown).
411 */
412 if (desc->bDeviceClass == 0x02)
413 return TYPE_H; /* variant 0 */
414
415 if (desc->bMaxPacketSize0 != 0x40) {
416 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
417 return TYPE_H; /* variant 1 */
418
419 return TYPE_H; /* variant 0 */
420 }
421
422 bcdDevice = le16_to_cpu(desc->bcdDevice);
423 bcdUSB = le16_to_cpu(desc->bcdUSB);
424
425 switch (bcdUSB) {
426 case 0x101:
427 /* USB 1.0.1? Let's assume they meant 1.1... */
428 fallthrough;
429 case 0x110:
430 switch (bcdDevice) {
431 case 0x300:
432 return TYPE_HX;
433 case 0x400:
434 return TYPE_HXD;
435 default:
436 return TYPE_HX;
437 }
438 break;
439 case 0x200:
440 switch (bcdDevice) {
441 case 0x100: /* GC */
442 case 0x105:
443 return TYPE_HXN;
444 case 0x300: /* GT / TA */
445 if (pl2303_supports_hx_status(serial))
446 return TYPE_TA;
447 fallthrough;
448 case 0x305:
449 case 0x400: /* GL */
450 case 0x405:
451 return TYPE_HXN;
452 case 0x500: /* GE / TB */
453 if (pl2303_supports_hx_status(serial))
454 return TYPE_TB;
455 fallthrough;
456 case 0x505:
457 case 0x600: /* GS */
458 case 0x605:
459 case 0x700: /* GR */
460 case 0x705:
461 return TYPE_HXN;
462 }
463 break;
464 }
465
466 dev_err(&serial->interface->dev,
467 "unknown device type, please report to linux-usb@vger.kernel.org\n");
468 return -ENODEV;
469}
470
471static bool pl2303_is_hxd_clone(struct usb_serial *serial)
472{
473 struct usb_device *udev = serial->dev;
474 unsigned char *buf;
475 int ret;
476
477 buf = kmalloc(7, GFP_KERNEL);
478 if (!buf)
479 return false;
480
481 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
482 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
483 0, 0, buf, 7, 100);
484
485 kfree(buf);
486
487 return ret == -EPIPE;
488}
489
490static int pl2303_startup(struct usb_serial *serial)
491{
492 struct pl2303_serial_private *spriv;
493 enum pl2303_type type;
494 unsigned char *buf;
495 int ret;
496
497 ret = pl2303_detect_type(serial);
498 if (ret < 0)
499 return ret;
500
501 type = ret;
502 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
503
504 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
505 if (!spriv)
506 return -ENOMEM;
507
508 spriv->type = &pl2303_type_data[type];
509 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
510 spriv->quirks |= spriv->type->quirks;
511
512 if (type == TYPE_HXD && pl2303_is_hxd_clone(serial))
513 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE;
514
515 usb_set_serial_data(serial, spriv);
516
517 if (type != TYPE_HXN) {
518 buf = kmalloc(1, GFP_KERNEL);
519 if (!buf) {
520 kfree(spriv);
521 return -ENOMEM;
522 }
523
524 pl2303_vendor_read(serial, 0x8484, buf);
525 pl2303_vendor_write(serial, 0x0404, 0);
526 pl2303_vendor_read(serial, 0x8484, buf);
527 pl2303_vendor_read(serial, 0x8383, buf);
528 pl2303_vendor_read(serial, 0x8484, buf);
529 pl2303_vendor_write(serial, 0x0404, 1);
530 pl2303_vendor_read(serial, 0x8484, buf);
531 pl2303_vendor_read(serial, 0x8383, buf);
532 pl2303_vendor_write(serial, 0, 1);
533 pl2303_vendor_write(serial, 1, 0);
534 if (spriv->quirks & PL2303_QUIRK_LEGACY)
535 pl2303_vendor_write(serial, 2, 0x24);
536 else
537 pl2303_vendor_write(serial, 2, 0x44);
538
539 kfree(buf);
540 }
541
542 return 0;
543}
544
545static void pl2303_release(struct usb_serial *serial)
546{
547 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
548
549 kfree(spriv);
550}
551
552static int pl2303_port_probe(struct usb_serial_port *port)
553{
554 struct pl2303_private *priv;
555
556 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
557 if (!priv)
558 return -ENOMEM;
559
560 spin_lock_init(&priv->lock);
561
562 usb_set_serial_port_data(port, priv);
563
564 port->port.drain_delay = 256;
565
566 return 0;
567}
568
569static void pl2303_port_remove(struct usb_serial_port *port)
570{
571 struct pl2303_private *priv = usb_get_serial_port_data(port);
572
573 kfree(priv);
574}
575
576static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
577{
578 struct usb_device *dev = port->serial->dev;
579 int retval;
580
581 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
582
583 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
584 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
585 value, 0, NULL, 0, 100);
586 if (retval)
587 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
588
589 return retval;
590}
591
592/*
593 * Returns the nearest supported baud rate that can be set directly without
594 * using divisors.
595 */
596static speed_t pl2303_get_supported_baud_rate(speed_t baud)
597{
598 static const speed_t baud_sup[] = {
599 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
600 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
601 614400, 921600, 1228800, 2457600, 3000000, 6000000
602 };
603
604 unsigned i;
605
606 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
607 if (baud_sup[i] > baud)
608 break;
609 }
610
611 if (i == ARRAY_SIZE(baud_sup))
612 baud = baud_sup[i - 1];
613 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
614 baud = baud_sup[i - 1];
615 else
616 baud = baud_sup[i];
617
618 return baud;
619}
620
621/*
622 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
623 * use 9600 baud.
624 */
625static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
626 speed_t baud)
627{
628 put_unaligned_le32(baud, buf);
629
630 return baud;
631}
632
633static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
634 speed_t baud)
635{
636 unsigned int baseline, mantissa, exponent;
637
638 /*
639 * Apparently the formula is:
640 * baudrate = 12M * 32 / (mantissa * 4^exponent)
641 * where
642 * mantissa = buf[8:0]
643 * exponent = buf[11:9]
644 */
645 baseline = 12000000 * 32;
646 mantissa = baseline / baud;
647 if (mantissa == 0)
648 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
649 exponent = 0;
650 while (mantissa >= 512) {
651 if (exponent < 7) {
652 mantissa >>= 2; /* divide by 4 */
653 exponent++;
654 } else {
655 /* Exponent is maxed. Trim mantissa and leave. */
656 mantissa = 511;
657 break;
658 }
659 }
660
661 buf[3] = 0x80;
662 buf[2] = 0;
663 buf[1] = exponent << 1 | mantissa >> 8;
664 buf[0] = mantissa & 0xff;
665
666 /* Calculate and return the exact baud rate. */
667 baud = (baseline / mantissa) >> (exponent << 1);
668
669 return baud;
670}
671
672static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
673 speed_t baud)
674{
675 unsigned int baseline, mantissa, exponent;
676
677 /*
678 * Apparently, for the TA version the formula is:
679 * baudrate = 12M * 32 / (mantissa * 2^exponent)
680 * where
681 * mantissa = buf[10:0]
682 * exponent = buf[15:13 16]
683 */
684 baseline = 12000000 * 32;
685 mantissa = baseline / baud;
686 if (mantissa == 0)
687 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
688 exponent = 0;
689 while (mantissa >= 2048) {
690 if (exponent < 15) {
691 mantissa >>= 1; /* divide by 2 */
692 exponent++;
693 } else {
694 /* Exponent is maxed. Trim mantissa and leave. */
695 mantissa = 2047;
696 break;
697 }
698 }
699
700 buf[3] = 0x80;
701 buf[2] = exponent & 0x01;
702 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
703 buf[0] = mantissa & 0xff;
704
705 /* Calculate and return the exact baud rate. */
706 baud = (baseline / mantissa) >> exponent;
707
708 return baud;
709}
710
711static void pl2303_encode_baud_rate(struct tty_struct *tty,
712 struct usb_serial_port *port,
713 u8 buf[4])
714{
715 struct usb_serial *serial = port->serial;
716 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
717 speed_t baud_sup;
718 speed_t baud;
719
720 baud = tty_get_baud_rate(tty);
721 dev_dbg(&port->dev, "baud requested = %u\n", baud);
722 if (!baud)
723 return;
724
725 if (spriv->type->max_baud_rate)
726 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
727 /*
728 * Use direct method for supported baud rates, otherwise use divisors.
729 * Newer chip types do not support divisor encoding.
730 */
731 if (spriv->type->no_divisors)
732 baud_sup = baud;
733 else
734 baud_sup = pl2303_get_supported_baud_rate(baud);
735
736 if (baud == baud_sup)
737 baud = pl2303_encode_baud_rate_direct(buf, baud);
738 else if (spriv->type->alt_divisors)
739 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
740 else
741 baud = pl2303_encode_baud_rate_divisor(buf, baud);
742
743 /* Save resulting baud rate */
744 tty_encode_baud_rate(tty, baud, baud);
745 dev_dbg(&port->dev, "baud set = %u\n", baud);
746}
747
748static int pl2303_get_line_request(struct usb_serial_port *port,
749 unsigned char buf[7])
750{
751 struct usb_serial *serial = port->serial;
752 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
753 struct usb_device *udev = serial->dev;
754 int ret;
755
756 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) {
757 struct pl2303_private *priv = usb_get_serial_port_data(port);
758
759 memcpy(buf, priv->line_settings, 7);
760 return 0;
761 }
762
763 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
764 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
765 0, 0, buf, 7, 100);
766 if (ret != 7) {
767 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
768
769 if (ret >= 0)
770 ret = -EIO;
771
772 return ret;
773 }
774
775 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
776
777 return 0;
778}
779
780static int pl2303_set_line_request(struct usb_serial_port *port,
781 unsigned char buf[7])
782{
783 struct usb_device *udev = port->serial->dev;
784 int ret;
785
786 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
787 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
788 0, 0, buf, 7, 100);
789 if (ret < 0) {
790 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
791 return ret;
792 }
793
794 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
795
796 return 0;
797}
798
799static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
800{
801 bool ixon_change;
802
803 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
804 a->c_cc[VSTART] != b->c_cc[VSTART] ||
805 a->c_cc[VSTOP] != b->c_cc[VSTOP];
806
807 return tty_termios_hw_change(a, b) || ixon_change;
808}
809
810static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
811{
812 if (!I_IXON(tty) || I_IXANY(tty))
813 return false;
814
815 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
816 return false;
817
818 if (type->no_autoxonxoff)
819 return false;
820
821 return true;
822}
823
824static void pl2303_set_termios(struct tty_struct *tty,
825 struct usb_serial_port *port,
826 const struct ktermios *old_termios)
827{
828 struct usb_serial *serial = port->serial;
829 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
830 struct pl2303_private *priv = usb_get_serial_port_data(port);
831 unsigned long flags;
832 unsigned char *buf;
833 int ret;
834 u8 control;
835
836 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
837 return;
838
839 buf = kzalloc(7, GFP_KERNEL);
840 if (!buf) {
841 /* Report back no change occurred */
842 if (old_termios)
843 tty->termios = *old_termios;
844 return;
845 }
846
847 pl2303_get_line_request(port, buf);
848
849 buf[6] = tty_get_char_size(tty->termios.c_cflag);
850 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
851
852 /* For reference buf[0]:buf[3] baud rate value */
853 pl2303_encode_baud_rate(tty, port, &buf[0]);
854
855 /* For reference buf[4]=0 is 1 stop bits */
856 /* For reference buf[4]=1 is 1.5 stop bits */
857 /* For reference buf[4]=2 is 2 stop bits */
858 if (C_CSTOPB(tty)) {
859 /*
860 * NOTE: Comply with "real" UARTs / RS232:
861 * use 1.5 instead of 2 stop bits with 5 data bits
862 */
863 if (C_CSIZE(tty) == CS5) {
864 buf[4] = 1;
865 dev_dbg(&port->dev, "stop bits = 1.5\n");
866 } else {
867 buf[4] = 2;
868 dev_dbg(&port->dev, "stop bits = 2\n");
869 }
870 } else {
871 buf[4] = 0;
872 dev_dbg(&port->dev, "stop bits = 1\n");
873 }
874
875 if (C_PARENB(tty)) {
876 /* For reference buf[5]=0 is none parity */
877 /* For reference buf[5]=1 is odd parity */
878 /* For reference buf[5]=2 is even parity */
879 /* For reference buf[5]=3 is mark parity */
880 /* For reference buf[5]=4 is space parity */
881 if (C_PARODD(tty)) {
882 if (C_CMSPAR(tty)) {
883 buf[5] = 3;
884 dev_dbg(&port->dev, "parity = mark\n");
885 } else {
886 buf[5] = 1;
887 dev_dbg(&port->dev, "parity = odd\n");
888 }
889 } else {
890 if (C_CMSPAR(tty)) {
891 buf[5] = 4;
892 dev_dbg(&port->dev, "parity = space\n");
893 } else {
894 buf[5] = 2;
895 dev_dbg(&port->dev, "parity = even\n");
896 }
897 }
898 } else {
899 buf[5] = 0;
900 dev_dbg(&port->dev, "parity = none\n");
901 }
902
903 /*
904 * Some PL2303 are known to lose bytes if you change serial settings
905 * even to the same values as before. Thus we actually need to filter
906 * in this specific case.
907 *
908 * Note that the tty_termios_hw_change check above is not sufficient
909 * as a previously requested baud rate may differ from the one
910 * actually used (and stored in old_termios).
911 *
912 * NOTE: No additional locking needed for line_settings as it is
913 * only used in set_termios, which is serialised against itself.
914 */
915 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
916 ret = pl2303_set_line_request(port, buf);
917 if (!ret)
918 memcpy(priv->line_settings, buf, 7);
919 }
920
921 /* change control lines if we are switching to or from B0 */
922 spin_lock_irqsave(&priv->lock, flags);
923 control = priv->line_control;
924 if (C_BAUD(tty) == B0)
925 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
926 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
927 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
928 if (control != priv->line_control) {
929 control = priv->line_control;
930 spin_unlock_irqrestore(&priv->lock, flags);
931 pl2303_set_control_lines(port, control);
932 } else {
933 spin_unlock_irqrestore(&priv->lock, flags);
934 }
935
936 if (C_CRTSCTS(tty)) {
937 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
938 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
939 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
940 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
941 PL2303_HXN_FLOWCTRL_MASK,
942 PL2303_HXN_FLOWCTRL_RTS_CTS);
943 } else {
944 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
945 }
946 } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
947 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
948 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
949 PL2303_HXN_FLOWCTRL_MASK,
950 PL2303_HXN_FLOWCTRL_XON_XOFF);
951 } else {
952 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
953 }
954 } else {
955 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
956 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
957 PL2303_HXN_FLOWCTRL_MASK,
958 PL2303_HXN_FLOWCTRL_NONE);
959 } else {
960 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
961 }
962 }
963
964 kfree(buf);
965}
966
967static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
968{
969 struct pl2303_private *priv = usb_get_serial_port_data(port);
970 unsigned long flags;
971 u8 control;
972
973 spin_lock_irqsave(&priv->lock, flags);
974 if (on)
975 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
976 else
977 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
978 control = priv->line_control;
979 spin_unlock_irqrestore(&priv->lock, flags);
980
981 pl2303_set_control_lines(port, control);
982}
983
984static void pl2303_close(struct usb_serial_port *port)
985{
986 usb_serial_generic_close(port);
987 usb_kill_urb(port->interrupt_in_urb);
988 pl2303_set_break(port, false);
989}
990
991static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
992{
993 struct usb_serial *serial = port->serial;
994 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
995 int result;
996
997 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
998 usb_clear_halt(serial->dev, port->write_urb->pipe);
999 usb_clear_halt(serial->dev, port->read_urb->pipe);
1000 } else {
1001 /* reset upstream data pipes */
1002 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
1003 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
1004 PL2303_HXN_RESET_UPSTREAM_PIPE |
1005 PL2303_HXN_RESET_DOWNSTREAM_PIPE);
1006 } else {
1007 pl2303_vendor_write(serial, 8, 0);
1008 pl2303_vendor_write(serial, 9, 0);
1009 }
1010 }
1011
1012 /* Setup termios */
1013 if (tty)
1014 pl2303_set_termios(tty, port, NULL);
1015
1016 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1017 if (result) {
1018 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
1019 result);
1020 return result;
1021 }
1022
1023 result = usb_serial_generic_open(tty, port);
1024 if (result) {
1025 usb_kill_urb(port->interrupt_in_urb);
1026 return result;
1027 }
1028
1029 return 0;
1030}
1031
1032static int pl2303_tiocmset(struct tty_struct *tty,
1033 unsigned int set, unsigned int clear)
1034{
1035 struct usb_serial_port *port = tty->driver_data;
1036 struct pl2303_private *priv = usb_get_serial_port_data(port);
1037 unsigned long flags;
1038 u8 control;
1039 int ret;
1040
1041 spin_lock_irqsave(&priv->lock, flags);
1042 if (set & TIOCM_RTS)
1043 priv->line_control |= CONTROL_RTS;
1044 if (set & TIOCM_DTR)
1045 priv->line_control |= CONTROL_DTR;
1046 if (clear & TIOCM_RTS)
1047 priv->line_control &= ~CONTROL_RTS;
1048 if (clear & TIOCM_DTR)
1049 priv->line_control &= ~CONTROL_DTR;
1050 control = priv->line_control;
1051 spin_unlock_irqrestore(&priv->lock, flags);
1052
1053 ret = pl2303_set_control_lines(port, control);
1054 if (ret)
1055 return usb_translate_errors(ret);
1056
1057 return 0;
1058}
1059
1060static int pl2303_tiocmget(struct tty_struct *tty)
1061{
1062 struct usb_serial_port *port = tty->driver_data;
1063 struct pl2303_private *priv = usb_get_serial_port_data(port);
1064 unsigned long flags;
1065 unsigned int mcr;
1066 unsigned int status;
1067 unsigned int result;
1068
1069 spin_lock_irqsave(&priv->lock, flags);
1070 mcr = priv->line_control;
1071 status = priv->line_status;
1072 spin_unlock_irqrestore(&priv->lock, flags);
1073
1074 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
1075 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
1076 | ((status & UART_CTS) ? TIOCM_CTS : 0)
1077 | ((status & UART_DSR) ? TIOCM_DSR : 0)
1078 | ((status & UART_RING) ? TIOCM_RI : 0)
1079 | ((status & UART_DCD) ? TIOCM_CD : 0);
1080
1081 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1082
1083 return result;
1084}
1085
1086static int pl2303_carrier_raised(struct usb_serial_port *port)
1087{
1088 struct pl2303_private *priv = usb_get_serial_port_data(port);
1089
1090 if (priv->line_status & UART_DCD)
1091 return 1;
1092
1093 return 0;
1094}
1095
1096static int pl2303_set_break(struct usb_serial_port *port, bool enable)
1097{
1098 struct usb_serial *serial = port->serial;
1099 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1100 u16 state;
1101 int result;
1102
1103 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE)
1104 return -ENOTTY;
1105
1106 if (enable)
1107 state = BREAK_ON;
1108 else
1109 state = BREAK_OFF;
1110
1111 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1112 state == BREAK_OFF ? "off" : "on");
1113
1114 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1115 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1116 0, NULL, 0, 100);
1117 if (result) {
1118 dev_err(&port->dev, "error sending break = %d\n", result);
1119 return result;
1120 }
1121
1122 return 0;
1123}
1124
1125static int pl2303_break_ctl(struct tty_struct *tty, int state)
1126{
1127 struct usb_serial_port *port = tty->driver_data;
1128
1129 return pl2303_set_break(port, state);
1130}
1131
1132static void pl2303_update_line_status(struct usb_serial_port *port,
1133 unsigned char *data,
1134 unsigned int actual_length)
1135{
1136 struct usb_serial *serial = port->serial;
1137 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1138 struct pl2303_private *priv = usb_get_serial_port_data(port);
1139 struct tty_struct *tty;
1140 unsigned long flags;
1141 unsigned int status_idx = UART_STATE_INDEX;
1142 u8 status;
1143 u8 delta;
1144
1145 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1146 status_idx = 0;
1147
1148 if (actual_length < status_idx + 1)
1149 return;
1150
1151 status = data[status_idx];
1152
1153 /* Save off the uart status for others to look at */
1154 spin_lock_irqsave(&priv->lock, flags);
1155 delta = priv->line_status ^ status;
1156 priv->line_status = status;
1157 spin_unlock_irqrestore(&priv->lock, flags);
1158
1159 if (status & UART_BREAK_ERROR)
1160 usb_serial_handle_break(port);
1161
1162 if (delta & UART_STATE_MSR_MASK) {
1163 if (delta & UART_CTS)
1164 port->icount.cts++;
1165 if (delta & UART_DSR)
1166 port->icount.dsr++;
1167 if (delta & UART_RING)
1168 port->icount.rng++;
1169 if (delta & UART_DCD) {
1170 port->icount.dcd++;
1171 tty = tty_port_tty_get(&port->port);
1172 if (tty) {
1173 usb_serial_handle_dcd_change(port, tty,
1174 status & UART_DCD);
1175 tty_kref_put(tty);
1176 }
1177 }
1178
1179 wake_up_interruptible(&port->port.delta_msr_wait);
1180 }
1181}
1182
1183static void pl2303_read_int_callback(struct urb *urb)
1184{
1185 struct usb_serial_port *port = urb->context;
1186 unsigned char *data = urb->transfer_buffer;
1187 unsigned int actual_length = urb->actual_length;
1188 int status = urb->status;
1189 int retval;
1190
1191 switch (status) {
1192 case 0:
1193 /* success */
1194 break;
1195 case -ECONNRESET:
1196 case -ENOENT:
1197 case -ESHUTDOWN:
1198 /* this urb is terminated, clean up */
1199 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1200 __func__, status);
1201 return;
1202 default:
1203 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1204 __func__, status);
1205 goto exit;
1206 }
1207
1208 usb_serial_debug_data(&port->dev, __func__,
1209 urb->actual_length, urb->transfer_buffer);
1210
1211 pl2303_update_line_status(port, data, actual_length);
1212
1213exit:
1214 retval = usb_submit_urb(urb, GFP_ATOMIC);
1215 if (retval) {
1216 dev_err(&port->dev,
1217 "%s - usb_submit_urb failed with result %d\n",
1218 __func__, retval);
1219 }
1220}
1221
1222static void pl2303_process_read_urb(struct urb *urb)
1223{
1224 struct usb_serial_port *port = urb->context;
1225 struct pl2303_private *priv = usb_get_serial_port_data(port);
1226 unsigned char *data = urb->transfer_buffer;
1227 char tty_flag = TTY_NORMAL;
1228 unsigned long flags;
1229 u8 line_status;
1230 int i;
1231
1232 /* update line status */
1233 spin_lock_irqsave(&priv->lock, flags);
1234 line_status = priv->line_status;
1235 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1236 spin_unlock_irqrestore(&priv->lock, flags);
1237
1238 if (!urb->actual_length)
1239 return;
1240
1241 /*
1242 * Break takes precedence over parity, which takes precedence over
1243 * framing errors.
1244 */
1245 if (line_status & UART_BREAK_ERROR)
1246 tty_flag = TTY_BREAK;
1247 else if (line_status & UART_PARITY_ERROR)
1248 tty_flag = TTY_PARITY;
1249 else if (line_status & UART_FRAME_ERROR)
1250 tty_flag = TTY_FRAME;
1251
1252 if (tty_flag != TTY_NORMAL)
1253 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1254 tty_flag);
1255 /* overrun is special, not associated with a char */
1256 if (line_status & UART_OVERRUN_ERROR)
1257 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1258
1259 if (port->sysrq) {
1260 for (i = 0; i < urb->actual_length; ++i)
1261 if (!usb_serial_handle_sysrq_char(port, data[i]))
1262 tty_insert_flip_char(&port->port, data[i],
1263 tty_flag);
1264 } else {
1265 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1266 urb->actual_length);
1267 }
1268
1269 tty_flip_buffer_push(&port->port);
1270}
1271
1272static struct usb_serial_driver pl2303_device = {
1273 .driver = {
1274 .name = "pl2303",
1275 },
1276 .id_table = id_table,
1277 .num_bulk_in = 1,
1278 .num_bulk_out = 1,
1279 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
1280 .bulk_in_size = 256,
1281 .bulk_out_size = 256,
1282 .open = pl2303_open,
1283 .close = pl2303_close,
1284 .dtr_rts = pl2303_dtr_rts,
1285 .carrier_raised = pl2303_carrier_raised,
1286 .break_ctl = pl2303_break_ctl,
1287 .set_termios = pl2303_set_termios,
1288 .tiocmget = pl2303_tiocmget,
1289 .tiocmset = pl2303_tiocmset,
1290 .tiocmiwait = usb_serial_generic_tiocmiwait,
1291 .process_read_urb = pl2303_process_read_urb,
1292 .read_int_callback = pl2303_read_int_callback,
1293 .probe = pl2303_probe,
1294 .calc_num_ports = pl2303_calc_num_ports,
1295 .attach = pl2303_startup,
1296 .release = pl2303_release,
1297 .port_probe = pl2303_port_probe,
1298 .port_remove = pl2303_port_remove,
1299};
1300
1301static struct usb_serial_driver * const serial_drivers[] = {
1302 &pl2303_device, NULL
1303};
1304
1305module_usb_serial_driver(serial_drivers, id_table);
1306
1307MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1308MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Prolific PL2303 USB to serial adaptor driver
4 *
5 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2003 IBM Corp.
7 *
8 * Original driver for 2.2.x by anonymous
9 *
10 * See Documentation/usb/usb-serial.rst for more information on using this
11 * driver
12 */
13
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/tty.h>
18#include <linux/tty_driver.h>
19#include <linux/tty_flip.h>
20#include <linux/serial.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/spinlock.h>
24#include <linux/uaccess.h>
25#include <linux/usb.h>
26#include <linux/usb/serial.h>
27#include <asm/unaligned.h>
28#include "pl2303.h"
29
30
31#define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
32#define PL2303_QUIRK_LEGACY BIT(1)
33#define PL2303_QUIRK_ENDPOINT_HACK BIT(2)
34
35static const struct usb_device_id id_table[] = {
36 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
37 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
49 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
50 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
51 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
52 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
54 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
56 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
57 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
58 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
59 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
60 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
61 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
62 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
63 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
64 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
65 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
66 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
67 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
68 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
69 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
70 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
71 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
72 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
73 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
74 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
75 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
76 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
77 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
78 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
79 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
80 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
81 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
82 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
83 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
84 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
85 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
86 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
87 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
88 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
89 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
90 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
91 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
92 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
93 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
94 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
95 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
96 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
97 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
98 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
99 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
100 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
101 { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
102 { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
103 { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
104 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
105 { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
106 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
107 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
108 { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
109 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
110 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
111 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
112 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
113 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
114 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
115 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
116 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
117 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
118 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
119 { } /* Terminating entry */
120};
121
122MODULE_DEVICE_TABLE(usb, id_table);
123
124#define SET_LINE_REQUEST_TYPE 0x21
125#define SET_LINE_REQUEST 0x20
126
127#define SET_CONTROL_REQUEST_TYPE 0x21
128#define SET_CONTROL_REQUEST 0x22
129#define CONTROL_DTR 0x01
130#define CONTROL_RTS 0x02
131
132#define BREAK_REQUEST_TYPE 0x21
133#define BREAK_REQUEST 0x23
134#define BREAK_ON 0xffff
135#define BREAK_OFF 0x0000
136
137#define GET_LINE_REQUEST_TYPE 0xa1
138#define GET_LINE_REQUEST 0x21
139
140#define VENDOR_WRITE_REQUEST_TYPE 0x40
141#define VENDOR_WRITE_REQUEST 0x01
142#define VENDOR_WRITE_NREQUEST 0x80
143
144#define VENDOR_READ_REQUEST_TYPE 0xc0
145#define VENDOR_READ_REQUEST 0x01
146#define VENDOR_READ_NREQUEST 0x81
147
148#define UART_STATE_INDEX 8
149#define UART_STATE_MSR_MASK 0x8b
150#define UART_STATE_TRANSIENT_MASK 0x74
151#define UART_DCD 0x01
152#define UART_DSR 0x02
153#define UART_BREAK_ERROR 0x04
154#define UART_RING 0x08
155#define UART_FRAME_ERROR 0x10
156#define UART_PARITY_ERROR 0x20
157#define UART_OVERRUN_ERROR 0x40
158#define UART_CTS 0x80
159
160#define PL2303_FLOWCTRL_MASK 0xf0
161
162#define PL2303_READ_TYPE_HX_STATUS 0x8080
163
164#define PL2303_HXN_RESET_REG 0x07
165#define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02
166#define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01
167
168#define PL2303_HXN_FLOWCTRL_REG 0x0a
169#define PL2303_HXN_FLOWCTRL_MASK 0x1c
170#define PL2303_HXN_FLOWCTRL_NONE 0x1c
171#define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18
172#define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c
173
174static void pl2303_set_break(struct usb_serial_port *port, bool enable);
175
176enum pl2303_type {
177 TYPE_H,
178 TYPE_HX,
179 TYPE_TA,
180 TYPE_TB,
181 TYPE_HXD,
182 TYPE_HXN,
183 TYPE_COUNT
184};
185
186struct pl2303_type_data {
187 const char *name;
188 speed_t max_baud_rate;
189 unsigned long quirks;
190 unsigned int no_autoxonxoff:1;
191 unsigned int no_divisors:1;
192 unsigned int alt_divisors:1;
193};
194
195struct pl2303_serial_private {
196 const struct pl2303_type_data *type;
197 unsigned long quirks;
198};
199
200struct pl2303_private {
201 spinlock_t lock;
202 u8 line_control;
203 u8 line_status;
204
205 u8 line_settings[7];
206};
207
208static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
209 [TYPE_H] = {
210 .name = "H",
211 .max_baud_rate = 1228800,
212 .quirks = PL2303_QUIRK_LEGACY,
213 .no_autoxonxoff = true,
214 },
215 [TYPE_HX] = {
216 .name = "HX",
217 .max_baud_rate = 6000000,
218 },
219 [TYPE_TA] = {
220 .name = "TA",
221 .max_baud_rate = 6000000,
222 .alt_divisors = true,
223 },
224 [TYPE_TB] = {
225 .name = "TB",
226 .max_baud_rate = 12000000,
227 .alt_divisors = true,
228 },
229 [TYPE_HXD] = {
230 .name = "HXD",
231 .max_baud_rate = 12000000,
232 },
233 [TYPE_HXN] = {
234 .name = "G",
235 .max_baud_rate = 12000000,
236 .no_divisors = true,
237 },
238};
239
240static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
241 unsigned char buf[1])
242{
243 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
244 struct device *dev = &serial->interface->dev;
245 u8 request;
246 int res;
247
248 if (spriv->type == &pl2303_type_data[TYPE_HXN])
249 request = VENDOR_READ_NREQUEST;
250 else
251 request = VENDOR_READ_REQUEST;
252
253 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
254 request, VENDOR_READ_REQUEST_TYPE,
255 value, 0, buf, 1, 100);
256 if (res != 1) {
257 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
258 value, res);
259 if (res >= 0)
260 res = -EIO;
261
262 return res;
263 }
264
265 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
266
267 return 0;
268}
269
270static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
271{
272 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
273 struct device *dev = &serial->interface->dev;
274 u8 request;
275 int res;
276
277 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
278
279 if (spriv->type == &pl2303_type_data[TYPE_HXN])
280 request = VENDOR_WRITE_NREQUEST;
281 else
282 request = VENDOR_WRITE_REQUEST;
283
284 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
285 request, VENDOR_WRITE_REQUEST_TYPE,
286 value, index, NULL, 0, 100);
287 if (res) {
288 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
289 value, res);
290 return res;
291 }
292
293 return 0;
294}
295
296static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
297{
298 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
299 int ret = 0;
300 u8 *buf;
301
302 buf = kmalloc(1, GFP_KERNEL);
303 if (!buf)
304 return -ENOMEM;
305
306 if (spriv->type == &pl2303_type_data[TYPE_HXN])
307 ret = pl2303_vendor_read(serial, reg, buf);
308 else
309 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
310
311 if (ret)
312 goto out_free;
313
314 *buf &= ~mask;
315 *buf |= val & mask;
316
317 ret = pl2303_vendor_write(serial, reg, *buf);
318out_free:
319 kfree(buf);
320
321 return ret;
322}
323
324static int pl2303_probe(struct usb_serial *serial,
325 const struct usb_device_id *id)
326{
327 usb_set_serial_data(serial, (void *)id->driver_info);
328
329 return 0;
330}
331
332/*
333 * Use interrupt endpoint from first interface if available.
334 *
335 * This is needed due to the looney way its endpoints are set up.
336 */
337static int pl2303_endpoint_hack(struct usb_serial *serial,
338 struct usb_serial_endpoints *epds)
339{
340 struct usb_interface *interface = serial->interface;
341 struct usb_device *dev = serial->dev;
342 struct device *ddev = &interface->dev;
343 struct usb_host_interface *iface_desc;
344 struct usb_endpoint_descriptor *endpoint;
345 unsigned int i;
346
347 if (interface == dev->actconfig->interface[0])
348 return 0;
349
350 /* check out the endpoints of the other interface */
351 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
352
353 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
354 endpoint = &iface_desc->endpoint[i].desc;
355
356 if (!usb_endpoint_is_int_in(endpoint))
357 continue;
358
359 dev_dbg(ddev, "found interrupt in on separate interface\n");
360 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
361 epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
362 }
363
364 return 0;
365}
366
367static int pl2303_calc_num_ports(struct usb_serial *serial,
368 struct usb_serial_endpoints *epds)
369{
370 unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
371 struct device *dev = &serial->interface->dev;
372 int ret;
373
374 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
375 ret = pl2303_endpoint_hack(serial, epds);
376 if (ret)
377 return ret;
378 }
379
380 if (epds->num_interrupt_in < 1) {
381 dev_err(dev, "required interrupt-in endpoint missing\n");
382 return -ENODEV;
383 }
384
385 return 1;
386}
387
388static bool pl2303_supports_hx_status(struct usb_serial *serial)
389{
390 int ret;
391 u8 buf;
392
393 ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
394 VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
395 0, &buf, 1, 100, GFP_KERNEL);
396
397 return ret == 0;
398}
399
400static int pl2303_detect_type(struct usb_serial *serial)
401{
402 struct usb_device_descriptor *desc = &serial->dev->descriptor;
403 u16 bcdDevice, bcdUSB;
404
405 /*
406 * Legacy PL2303H, variants 0 and 1 (difference unknown).
407 */
408 if (desc->bDeviceClass == 0x02)
409 return TYPE_H; /* variant 0 */
410
411 if (desc->bMaxPacketSize0 != 0x40) {
412 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
413 return TYPE_H; /* variant 1 */
414
415 return TYPE_H; /* variant 0 */
416 }
417
418 bcdDevice = le16_to_cpu(desc->bcdDevice);
419 bcdUSB = le16_to_cpu(desc->bcdUSB);
420
421 switch (bcdUSB) {
422 case 0x110:
423 switch (bcdDevice) {
424 case 0x300:
425 return TYPE_HX;
426 case 0x400:
427 return TYPE_HXD;
428 default:
429 return TYPE_HX;
430 }
431 break;
432 case 0x200:
433 switch (bcdDevice) {
434 case 0x100:
435 case 0x305:
436 case 0x405:
437 /*
438 * Assume it's an HXN-type if the device doesn't
439 * support the old read request value.
440 */
441 if (!pl2303_supports_hx_status(serial))
442 return TYPE_HXN;
443 break;
444 case 0x300:
445 return TYPE_TA;
446 case 0x500:
447 return TYPE_TB;
448 }
449 break;
450 }
451
452 dev_err(&serial->interface->dev,
453 "unknown device type, please report to linux-usb@vger.kernel.org\n");
454 return -ENODEV;
455}
456
457static int pl2303_startup(struct usb_serial *serial)
458{
459 struct pl2303_serial_private *spriv;
460 enum pl2303_type type;
461 unsigned char *buf;
462 int ret;
463
464 ret = pl2303_detect_type(serial);
465 if (ret < 0)
466 return ret;
467
468 type = ret;
469 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
470
471 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
472 if (!spriv)
473 return -ENOMEM;
474
475 spriv->type = &pl2303_type_data[type];
476 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
477 spriv->quirks |= spriv->type->quirks;
478
479 usb_set_serial_data(serial, spriv);
480
481 if (type != TYPE_HXN) {
482 buf = kmalloc(1, GFP_KERNEL);
483 if (!buf) {
484 kfree(spriv);
485 return -ENOMEM;
486 }
487
488 pl2303_vendor_read(serial, 0x8484, buf);
489 pl2303_vendor_write(serial, 0x0404, 0);
490 pl2303_vendor_read(serial, 0x8484, buf);
491 pl2303_vendor_read(serial, 0x8383, buf);
492 pl2303_vendor_read(serial, 0x8484, buf);
493 pl2303_vendor_write(serial, 0x0404, 1);
494 pl2303_vendor_read(serial, 0x8484, buf);
495 pl2303_vendor_read(serial, 0x8383, buf);
496 pl2303_vendor_write(serial, 0, 1);
497 pl2303_vendor_write(serial, 1, 0);
498 if (spriv->quirks & PL2303_QUIRK_LEGACY)
499 pl2303_vendor_write(serial, 2, 0x24);
500 else
501 pl2303_vendor_write(serial, 2, 0x44);
502
503 kfree(buf);
504 }
505
506 return 0;
507}
508
509static void pl2303_release(struct usb_serial *serial)
510{
511 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
512
513 kfree(spriv);
514}
515
516static int pl2303_port_probe(struct usb_serial_port *port)
517{
518 struct pl2303_private *priv;
519
520 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
521 if (!priv)
522 return -ENOMEM;
523
524 spin_lock_init(&priv->lock);
525
526 usb_set_serial_port_data(port, priv);
527
528 port->port.drain_delay = 256;
529
530 return 0;
531}
532
533static void pl2303_port_remove(struct usb_serial_port *port)
534{
535 struct pl2303_private *priv = usb_get_serial_port_data(port);
536
537 kfree(priv);
538}
539
540static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
541{
542 struct usb_device *dev = port->serial->dev;
543 int retval;
544
545 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
546
547 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
548 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
549 value, 0, NULL, 0, 100);
550 if (retval)
551 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
552
553 return retval;
554}
555
556/*
557 * Returns the nearest supported baud rate that can be set directly without
558 * using divisors.
559 */
560static speed_t pl2303_get_supported_baud_rate(speed_t baud)
561{
562 static const speed_t baud_sup[] = {
563 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
564 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
565 614400, 921600, 1228800, 2457600, 3000000, 6000000
566 };
567
568 unsigned i;
569
570 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
571 if (baud_sup[i] > baud)
572 break;
573 }
574
575 if (i == ARRAY_SIZE(baud_sup))
576 baud = baud_sup[i - 1];
577 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
578 baud = baud_sup[i - 1];
579 else
580 baud = baud_sup[i];
581
582 return baud;
583}
584
585/*
586 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
587 * use 9600 baud.
588 */
589static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
590 speed_t baud)
591{
592 put_unaligned_le32(baud, buf);
593
594 return baud;
595}
596
597static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
598 speed_t baud)
599{
600 unsigned int baseline, mantissa, exponent;
601
602 /*
603 * Apparently the formula is:
604 * baudrate = 12M * 32 / (mantissa * 4^exponent)
605 * where
606 * mantissa = buf[8:0]
607 * exponent = buf[11:9]
608 */
609 baseline = 12000000 * 32;
610 mantissa = baseline / baud;
611 if (mantissa == 0)
612 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
613 exponent = 0;
614 while (mantissa >= 512) {
615 if (exponent < 7) {
616 mantissa >>= 2; /* divide by 4 */
617 exponent++;
618 } else {
619 /* Exponent is maxed. Trim mantissa and leave. */
620 mantissa = 511;
621 break;
622 }
623 }
624
625 buf[3] = 0x80;
626 buf[2] = 0;
627 buf[1] = exponent << 1 | mantissa >> 8;
628 buf[0] = mantissa & 0xff;
629
630 /* Calculate and return the exact baud rate. */
631 baud = (baseline / mantissa) >> (exponent << 1);
632
633 return baud;
634}
635
636static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
637 speed_t baud)
638{
639 unsigned int baseline, mantissa, exponent;
640
641 /*
642 * Apparently, for the TA version the formula is:
643 * baudrate = 12M * 32 / (mantissa * 2^exponent)
644 * where
645 * mantissa = buf[10:0]
646 * exponent = buf[15:13 16]
647 */
648 baseline = 12000000 * 32;
649 mantissa = baseline / baud;
650 if (mantissa == 0)
651 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
652 exponent = 0;
653 while (mantissa >= 2048) {
654 if (exponent < 15) {
655 mantissa >>= 1; /* divide by 2 */
656 exponent++;
657 } else {
658 /* Exponent is maxed. Trim mantissa and leave. */
659 mantissa = 2047;
660 break;
661 }
662 }
663
664 buf[3] = 0x80;
665 buf[2] = exponent & 0x01;
666 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
667 buf[0] = mantissa & 0xff;
668
669 /* Calculate and return the exact baud rate. */
670 baud = (baseline / mantissa) >> exponent;
671
672 return baud;
673}
674
675static void pl2303_encode_baud_rate(struct tty_struct *tty,
676 struct usb_serial_port *port,
677 u8 buf[4])
678{
679 struct usb_serial *serial = port->serial;
680 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
681 speed_t baud_sup;
682 speed_t baud;
683
684 baud = tty_get_baud_rate(tty);
685 dev_dbg(&port->dev, "baud requested = %u\n", baud);
686 if (!baud)
687 return;
688
689 if (spriv->type->max_baud_rate)
690 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
691 /*
692 * Use direct method for supported baud rates, otherwise use divisors.
693 * Newer chip types do not support divisor encoding.
694 */
695 if (spriv->type->no_divisors)
696 baud_sup = baud;
697 else
698 baud_sup = pl2303_get_supported_baud_rate(baud);
699
700 if (baud == baud_sup)
701 baud = pl2303_encode_baud_rate_direct(buf, baud);
702 else if (spriv->type->alt_divisors)
703 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
704 else
705 baud = pl2303_encode_baud_rate_divisor(buf, baud);
706
707 /* Save resulting baud rate */
708 tty_encode_baud_rate(tty, baud, baud);
709 dev_dbg(&port->dev, "baud set = %u\n", baud);
710}
711
712static int pl2303_get_line_request(struct usb_serial_port *port,
713 unsigned char buf[7])
714{
715 struct usb_device *udev = port->serial->dev;
716 int ret;
717
718 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
719 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
720 0, 0, buf, 7, 100);
721 if (ret != 7) {
722 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
723
724 if (ret >= 0)
725 ret = -EIO;
726
727 return ret;
728 }
729
730 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
731
732 return 0;
733}
734
735static int pl2303_set_line_request(struct usb_serial_port *port,
736 unsigned char buf[7])
737{
738 struct usb_device *udev = port->serial->dev;
739 int ret;
740
741 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
742 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
743 0, 0, buf, 7, 100);
744 if (ret < 0) {
745 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
746 return ret;
747 }
748
749 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
750
751 return 0;
752}
753
754static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
755{
756 bool ixon_change;
757
758 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
759 a->c_cc[VSTART] != b->c_cc[VSTART] ||
760 a->c_cc[VSTOP] != b->c_cc[VSTOP];
761
762 return tty_termios_hw_change(a, b) || ixon_change;
763}
764
765static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
766{
767 if (!I_IXON(tty) || I_IXANY(tty))
768 return false;
769
770 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
771 return false;
772
773 if (type->no_autoxonxoff)
774 return false;
775
776 return true;
777}
778
779static void pl2303_set_termios(struct tty_struct *tty,
780 struct usb_serial_port *port, struct ktermios *old_termios)
781{
782 struct usb_serial *serial = port->serial;
783 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
784 struct pl2303_private *priv = usb_get_serial_port_data(port);
785 unsigned long flags;
786 unsigned char *buf;
787 int ret;
788 u8 control;
789
790 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
791 return;
792
793 buf = kzalloc(7, GFP_KERNEL);
794 if (!buf) {
795 /* Report back no change occurred */
796 if (old_termios)
797 tty->termios = *old_termios;
798 return;
799 }
800
801 pl2303_get_line_request(port, buf);
802
803 buf[6] = tty_get_char_size(tty->termios.c_cflag);
804 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
805
806 /* For reference buf[0]:buf[3] baud rate value */
807 pl2303_encode_baud_rate(tty, port, &buf[0]);
808
809 /* For reference buf[4]=0 is 1 stop bits */
810 /* For reference buf[4]=1 is 1.5 stop bits */
811 /* For reference buf[4]=2 is 2 stop bits */
812 if (C_CSTOPB(tty)) {
813 /*
814 * NOTE: Comply with "real" UARTs / RS232:
815 * use 1.5 instead of 2 stop bits with 5 data bits
816 */
817 if (C_CSIZE(tty) == CS5) {
818 buf[4] = 1;
819 dev_dbg(&port->dev, "stop bits = 1.5\n");
820 } else {
821 buf[4] = 2;
822 dev_dbg(&port->dev, "stop bits = 2\n");
823 }
824 } else {
825 buf[4] = 0;
826 dev_dbg(&port->dev, "stop bits = 1\n");
827 }
828
829 if (C_PARENB(tty)) {
830 /* For reference buf[5]=0 is none parity */
831 /* For reference buf[5]=1 is odd parity */
832 /* For reference buf[5]=2 is even parity */
833 /* For reference buf[5]=3 is mark parity */
834 /* For reference buf[5]=4 is space parity */
835 if (C_PARODD(tty)) {
836 if (C_CMSPAR(tty)) {
837 buf[5] = 3;
838 dev_dbg(&port->dev, "parity = mark\n");
839 } else {
840 buf[5] = 1;
841 dev_dbg(&port->dev, "parity = odd\n");
842 }
843 } else {
844 if (C_CMSPAR(tty)) {
845 buf[5] = 4;
846 dev_dbg(&port->dev, "parity = space\n");
847 } else {
848 buf[5] = 2;
849 dev_dbg(&port->dev, "parity = even\n");
850 }
851 }
852 } else {
853 buf[5] = 0;
854 dev_dbg(&port->dev, "parity = none\n");
855 }
856
857 /*
858 * Some PL2303 are known to lose bytes if you change serial settings
859 * even to the same values as before. Thus we actually need to filter
860 * in this specific case.
861 *
862 * Note that the tty_termios_hw_change check above is not sufficient
863 * as a previously requested baud rate may differ from the one
864 * actually used (and stored in old_termios).
865 *
866 * NOTE: No additional locking needed for line_settings as it is
867 * only used in set_termios, which is serialised against itself.
868 */
869 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
870 ret = pl2303_set_line_request(port, buf);
871 if (!ret)
872 memcpy(priv->line_settings, buf, 7);
873 }
874
875 /* change control lines if we are switching to or from B0 */
876 spin_lock_irqsave(&priv->lock, flags);
877 control = priv->line_control;
878 if (C_BAUD(tty) == B0)
879 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
880 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
881 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
882 if (control != priv->line_control) {
883 control = priv->line_control;
884 spin_unlock_irqrestore(&priv->lock, flags);
885 pl2303_set_control_lines(port, control);
886 } else {
887 spin_unlock_irqrestore(&priv->lock, flags);
888 }
889
890 if (C_CRTSCTS(tty)) {
891 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
892 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
893 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
894 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
895 PL2303_HXN_FLOWCTRL_MASK,
896 PL2303_HXN_FLOWCTRL_RTS_CTS);
897 } else {
898 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
899 }
900 } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
901 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
902 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
903 PL2303_HXN_FLOWCTRL_MASK,
904 PL2303_HXN_FLOWCTRL_XON_XOFF);
905 } else {
906 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
907 }
908 } else {
909 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
910 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
911 PL2303_HXN_FLOWCTRL_MASK,
912 PL2303_HXN_FLOWCTRL_NONE);
913 } else {
914 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
915 }
916 }
917
918 kfree(buf);
919}
920
921static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
922{
923 struct pl2303_private *priv = usb_get_serial_port_data(port);
924 unsigned long flags;
925 u8 control;
926
927 spin_lock_irqsave(&priv->lock, flags);
928 if (on)
929 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
930 else
931 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
932 control = priv->line_control;
933 spin_unlock_irqrestore(&priv->lock, flags);
934
935 pl2303_set_control_lines(port, control);
936}
937
938static void pl2303_close(struct usb_serial_port *port)
939{
940 usb_serial_generic_close(port);
941 usb_kill_urb(port->interrupt_in_urb);
942 pl2303_set_break(port, false);
943}
944
945static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
946{
947 struct usb_serial *serial = port->serial;
948 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
949 int result;
950
951 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
952 usb_clear_halt(serial->dev, port->write_urb->pipe);
953 usb_clear_halt(serial->dev, port->read_urb->pipe);
954 } else {
955 /* reset upstream data pipes */
956 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
957 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
958 PL2303_HXN_RESET_UPSTREAM_PIPE |
959 PL2303_HXN_RESET_DOWNSTREAM_PIPE);
960 } else {
961 pl2303_vendor_write(serial, 8, 0);
962 pl2303_vendor_write(serial, 9, 0);
963 }
964 }
965
966 /* Setup termios */
967 if (tty)
968 pl2303_set_termios(tty, port, NULL);
969
970 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
971 if (result) {
972 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
973 result);
974 return result;
975 }
976
977 result = usb_serial_generic_open(tty, port);
978 if (result) {
979 usb_kill_urb(port->interrupt_in_urb);
980 return result;
981 }
982
983 return 0;
984}
985
986static int pl2303_tiocmset(struct tty_struct *tty,
987 unsigned int set, unsigned int clear)
988{
989 struct usb_serial_port *port = tty->driver_data;
990 struct pl2303_private *priv = usb_get_serial_port_data(port);
991 unsigned long flags;
992 u8 control;
993 int ret;
994
995 spin_lock_irqsave(&priv->lock, flags);
996 if (set & TIOCM_RTS)
997 priv->line_control |= CONTROL_RTS;
998 if (set & TIOCM_DTR)
999 priv->line_control |= CONTROL_DTR;
1000 if (clear & TIOCM_RTS)
1001 priv->line_control &= ~CONTROL_RTS;
1002 if (clear & TIOCM_DTR)
1003 priv->line_control &= ~CONTROL_DTR;
1004 control = priv->line_control;
1005 spin_unlock_irqrestore(&priv->lock, flags);
1006
1007 ret = pl2303_set_control_lines(port, control);
1008 if (ret)
1009 return usb_translate_errors(ret);
1010
1011 return 0;
1012}
1013
1014static int pl2303_tiocmget(struct tty_struct *tty)
1015{
1016 struct usb_serial_port *port = tty->driver_data;
1017 struct pl2303_private *priv = usb_get_serial_port_data(port);
1018 unsigned long flags;
1019 unsigned int mcr;
1020 unsigned int status;
1021 unsigned int result;
1022
1023 spin_lock_irqsave(&priv->lock, flags);
1024 mcr = priv->line_control;
1025 status = priv->line_status;
1026 spin_unlock_irqrestore(&priv->lock, flags);
1027
1028 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
1029 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
1030 | ((status & UART_CTS) ? TIOCM_CTS : 0)
1031 | ((status & UART_DSR) ? TIOCM_DSR : 0)
1032 | ((status & UART_RING) ? TIOCM_RI : 0)
1033 | ((status & UART_DCD) ? TIOCM_CD : 0);
1034
1035 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1036
1037 return result;
1038}
1039
1040static int pl2303_carrier_raised(struct usb_serial_port *port)
1041{
1042 struct pl2303_private *priv = usb_get_serial_port_data(port);
1043
1044 if (priv->line_status & UART_DCD)
1045 return 1;
1046
1047 return 0;
1048}
1049
1050static void pl2303_set_break(struct usb_serial_port *port, bool enable)
1051{
1052 struct usb_serial *serial = port->serial;
1053 u16 state;
1054 int result;
1055
1056 if (enable)
1057 state = BREAK_ON;
1058 else
1059 state = BREAK_OFF;
1060
1061 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1062 state == BREAK_OFF ? "off" : "on");
1063
1064 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1065 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1066 0, NULL, 0, 100);
1067 if (result)
1068 dev_err(&port->dev, "error sending break = %d\n", result);
1069}
1070
1071static void pl2303_break_ctl(struct tty_struct *tty, int state)
1072{
1073 struct usb_serial_port *port = tty->driver_data;
1074
1075 pl2303_set_break(port, state);
1076}
1077
1078static void pl2303_update_line_status(struct usb_serial_port *port,
1079 unsigned char *data,
1080 unsigned int actual_length)
1081{
1082 struct usb_serial *serial = port->serial;
1083 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1084 struct pl2303_private *priv = usb_get_serial_port_data(port);
1085 struct tty_struct *tty;
1086 unsigned long flags;
1087 unsigned int status_idx = UART_STATE_INDEX;
1088 u8 status;
1089 u8 delta;
1090
1091 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1092 status_idx = 0;
1093
1094 if (actual_length < status_idx + 1)
1095 return;
1096
1097 status = data[status_idx];
1098
1099 /* Save off the uart status for others to look at */
1100 spin_lock_irqsave(&priv->lock, flags);
1101 delta = priv->line_status ^ status;
1102 priv->line_status = status;
1103 spin_unlock_irqrestore(&priv->lock, flags);
1104
1105 if (status & UART_BREAK_ERROR)
1106 usb_serial_handle_break(port);
1107
1108 if (delta & UART_STATE_MSR_MASK) {
1109 if (delta & UART_CTS)
1110 port->icount.cts++;
1111 if (delta & UART_DSR)
1112 port->icount.dsr++;
1113 if (delta & UART_RING)
1114 port->icount.rng++;
1115 if (delta & UART_DCD) {
1116 port->icount.dcd++;
1117 tty = tty_port_tty_get(&port->port);
1118 if (tty) {
1119 usb_serial_handle_dcd_change(port, tty,
1120 status & UART_DCD);
1121 tty_kref_put(tty);
1122 }
1123 }
1124
1125 wake_up_interruptible(&port->port.delta_msr_wait);
1126 }
1127}
1128
1129static void pl2303_read_int_callback(struct urb *urb)
1130{
1131 struct usb_serial_port *port = urb->context;
1132 unsigned char *data = urb->transfer_buffer;
1133 unsigned int actual_length = urb->actual_length;
1134 int status = urb->status;
1135 int retval;
1136
1137 switch (status) {
1138 case 0:
1139 /* success */
1140 break;
1141 case -ECONNRESET:
1142 case -ENOENT:
1143 case -ESHUTDOWN:
1144 /* this urb is terminated, clean up */
1145 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1146 __func__, status);
1147 return;
1148 default:
1149 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1150 __func__, status);
1151 goto exit;
1152 }
1153
1154 usb_serial_debug_data(&port->dev, __func__,
1155 urb->actual_length, urb->transfer_buffer);
1156
1157 pl2303_update_line_status(port, data, actual_length);
1158
1159exit:
1160 retval = usb_submit_urb(urb, GFP_ATOMIC);
1161 if (retval) {
1162 dev_err(&port->dev,
1163 "%s - usb_submit_urb failed with result %d\n",
1164 __func__, retval);
1165 }
1166}
1167
1168static void pl2303_process_read_urb(struct urb *urb)
1169{
1170 struct usb_serial_port *port = urb->context;
1171 struct pl2303_private *priv = usb_get_serial_port_data(port);
1172 unsigned char *data = urb->transfer_buffer;
1173 char tty_flag = TTY_NORMAL;
1174 unsigned long flags;
1175 u8 line_status;
1176 int i;
1177
1178 /* update line status */
1179 spin_lock_irqsave(&priv->lock, flags);
1180 line_status = priv->line_status;
1181 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1182 spin_unlock_irqrestore(&priv->lock, flags);
1183
1184 if (!urb->actual_length)
1185 return;
1186
1187 /*
1188 * Break takes precedence over parity, which takes precedence over
1189 * framing errors.
1190 */
1191 if (line_status & UART_BREAK_ERROR)
1192 tty_flag = TTY_BREAK;
1193 else if (line_status & UART_PARITY_ERROR)
1194 tty_flag = TTY_PARITY;
1195 else if (line_status & UART_FRAME_ERROR)
1196 tty_flag = TTY_FRAME;
1197
1198 if (tty_flag != TTY_NORMAL)
1199 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1200 tty_flag);
1201 /* overrun is special, not associated with a char */
1202 if (line_status & UART_OVERRUN_ERROR)
1203 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1204
1205 if (port->sysrq) {
1206 for (i = 0; i < urb->actual_length; ++i)
1207 if (!usb_serial_handle_sysrq_char(port, data[i]))
1208 tty_insert_flip_char(&port->port, data[i],
1209 tty_flag);
1210 } else {
1211 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1212 urb->actual_length);
1213 }
1214
1215 tty_flip_buffer_push(&port->port);
1216}
1217
1218static struct usb_serial_driver pl2303_device = {
1219 .driver = {
1220 .owner = THIS_MODULE,
1221 .name = "pl2303",
1222 },
1223 .id_table = id_table,
1224 .num_bulk_in = 1,
1225 .num_bulk_out = 1,
1226 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
1227 .bulk_in_size = 256,
1228 .bulk_out_size = 256,
1229 .open = pl2303_open,
1230 .close = pl2303_close,
1231 .dtr_rts = pl2303_dtr_rts,
1232 .carrier_raised = pl2303_carrier_raised,
1233 .break_ctl = pl2303_break_ctl,
1234 .set_termios = pl2303_set_termios,
1235 .tiocmget = pl2303_tiocmget,
1236 .tiocmset = pl2303_tiocmset,
1237 .tiocmiwait = usb_serial_generic_tiocmiwait,
1238 .process_read_urb = pl2303_process_read_urb,
1239 .read_int_callback = pl2303_read_int_callback,
1240 .probe = pl2303_probe,
1241 .calc_num_ports = pl2303_calc_num_ports,
1242 .attach = pl2303_startup,
1243 .release = pl2303_release,
1244 .port_probe = pl2303_port_probe,
1245 .port_remove = pl2303_port_remove,
1246};
1247
1248static struct usb_serial_driver * const serial_drivers[] = {
1249 &pl2303_device, NULL
1250};
1251
1252module_usb_serial_driver(serial_drivers, id_table);
1253
1254MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1255MODULE_LICENSE("GPL v2");