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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-block.git] / drivers / usb / serial / pl2303.c
... / ...
CommitLineData
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 case 0x905: /* GT-2AB */
462 case 0x1005: /* GC-Q20 */
463 return TYPE_HXN;
464 }
465 break;
466 }
467
468 dev_err(&serial->interface->dev,
469 "unknown device type, please report to linux-usb@vger.kernel.org\n");
470 return -ENODEV;
471}
472
473static bool pl2303_is_hxd_clone(struct usb_serial *serial)
474{
475 struct usb_device *udev = serial->dev;
476 unsigned char *buf;
477 int ret;
478
479 buf = kmalloc(7, GFP_KERNEL);
480 if (!buf)
481 return false;
482
483 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
484 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
485 0, 0, buf, 7, 100);
486
487 kfree(buf);
488
489 return ret == -EPIPE;
490}
491
492static int pl2303_startup(struct usb_serial *serial)
493{
494 struct pl2303_serial_private *spriv;
495 enum pl2303_type type;
496 unsigned char *buf;
497 int ret;
498
499 ret = pl2303_detect_type(serial);
500 if (ret < 0)
501 return ret;
502
503 type = ret;
504 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
505
506 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
507 if (!spriv)
508 return -ENOMEM;
509
510 spriv->type = &pl2303_type_data[type];
511 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
512 spriv->quirks |= spriv->type->quirks;
513
514 if (type == TYPE_HXD && pl2303_is_hxd_clone(serial))
515 spriv->quirks |= PL2303_QUIRK_NO_BREAK_GETLINE;
516
517 usb_set_serial_data(serial, spriv);
518
519 if (type != TYPE_HXN) {
520 buf = kmalloc(1, GFP_KERNEL);
521 if (!buf) {
522 kfree(spriv);
523 return -ENOMEM;
524 }
525
526 pl2303_vendor_read(serial, 0x8484, buf);
527 pl2303_vendor_write(serial, 0x0404, 0);
528 pl2303_vendor_read(serial, 0x8484, buf);
529 pl2303_vendor_read(serial, 0x8383, buf);
530 pl2303_vendor_read(serial, 0x8484, buf);
531 pl2303_vendor_write(serial, 0x0404, 1);
532 pl2303_vendor_read(serial, 0x8484, buf);
533 pl2303_vendor_read(serial, 0x8383, buf);
534 pl2303_vendor_write(serial, 0, 1);
535 pl2303_vendor_write(serial, 1, 0);
536 if (spriv->quirks & PL2303_QUIRK_LEGACY)
537 pl2303_vendor_write(serial, 2, 0x24);
538 else
539 pl2303_vendor_write(serial, 2, 0x44);
540
541 kfree(buf);
542 }
543
544 return 0;
545}
546
547static void pl2303_release(struct usb_serial *serial)
548{
549 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
550
551 kfree(spriv);
552}
553
554static int pl2303_port_probe(struct usb_serial_port *port)
555{
556 struct pl2303_private *priv;
557
558 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
559 if (!priv)
560 return -ENOMEM;
561
562 spin_lock_init(&priv->lock);
563
564 usb_set_serial_port_data(port, priv);
565
566 port->port.drain_delay = 256;
567
568 return 0;
569}
570
571static void pl2303_port_remove(struct usb_serial_port *port)
572{
573 struct pl2303_private *priv = usb_get_serial_port_data(port);
574
575 kfree(priv);
576}
577
578static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
579{
580 struct usb_device *dev = port->serial->dev;
581 int retval;
582
583 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
584
585 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
586 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
587 value, 0, NULL, 0, 100);
588 if (retval)
589 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
590
591 return retval;
592}
593
594/*
595 * Returns the nearest supported baud rate that can be set directly without
596 * using divisors.
597 */
598static speed_t pl2303_get_supported_baud_rate(speed_t baud)
599{
600 static const speed_t baud_sup[] = {
601 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
602 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
603 614400, 921600, 1228800, 2457600, 3000000, 6000000
604 };
605
606 unsigned i;
607
608 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
609 if (baud_sup[i] > baud)
610 break;
611 }
612
613 if (i == ARRAY_SIZE(baud_sup))
614 baud = baud_sup[i - 1];
615 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
616 baud = baud_sup[i - 1];
617 else
618 baud = baud_sup[i];
619
620 return baud;
621}
622
623/*
624 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
625 * use 9600 baud.
626 */
627static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
628 speed_t baud)
629{
630 put_unaligned_le32(baud, buf);
631
632 return baud;
633}
634
635static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
636 speed_t baud)
637{
638 unsigned int baseline, mantissa, exponent;
639
640 /*
641 * Apparently the formula is:
642 * baudrate = 12M * 32 / (mantissa * 4^exponent)
643 * where
644 * mantissa = buf[8:0]
645 * exponent = buf[11:9]
646 */
647 baseline = 12000000 * 32;
648 mantissa = baseline / baud;
649 if (mantissa == 0)
650 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
651 exponent = 0;
652 while (mantissa >= 512) {
653 if (exponent < 7) {
654 mantissa >>= 2; /* divide by 4 */
655 exponent++;
656 } else {
657 /* Exponent is maxed. Trim mantissa and leave. */
658 mantissa = 511;
659 break;
660 }
661 }
662
663 buf[3] = 0x80;
664 buf[2] = 0;
665 buf[1] = exponent << 1 | mantissa >> 8;
666 buf[0] = mantissa & 0xff;
667
668 /* Calculate and return the exact baud rate. */
669 baud = (baseline / mantissa) >> (exponent << 1);
670
671 return baud;
672}
673
674static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
675 speed_t baud)
676{
677 unsigned int baseline, mantissa, exponent;
678
679 /*
680 * Apparently, for the TA version the formula is:
681 * baudrate = 12M * 32 / (mantissa * 2^exponent)
682 * where
683 * mantissa = buf[10:0]
684 * exponent = buf[15:13 16]
685 */
686 baseline = 12000000 * 32;
687 mantissa = baseline / baud;
688 if (mantissa == 0)
689 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
690 exponent = 0;
691 while (mantissa >= 2048) {
692 if (exponent < 15) {
693 mantissa >>= 1; /* divide by 2 */
694 exponent++;
695 } else {
696 /* Exponent is maxed. Trim mantissa and leave. */
697 mantissa = 2047;
698 break;
699 }
700 }
701
702 buf[3] = 0x80;
703 buf[2] = exponent & 0x01;
704 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
705 buf[0] = mantissa & 0xff;
706
707 /* Calculate and return the exact baud rate. */
708 baud = (baseline / mantissa) >> exponent;
709
710 return baud;
711}
712
713static void pl2303_encode_baud_rate(struct tty_struct *tty,
714 struct usb_serial_port *port,
715 u8 buf[4])
716{
717 struct usb_serial *serial = port->serial;
718 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
719 speed_t baud_sup;
720 speed_t baud;
721
722 baud = tty_get_baud_rate(tty);
723 dev_dbg(&port->dev, "baud requested = %u\n", baud);
724 if (!baud)
725 return;
726
727 if (spriv->type->max_baud_rate)
728 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
729 /*
730 * Use direct method for supported baud rates, otherwise use divisors.
731 * Newer chip types do not support divisor encoding.
732 */
733 if (spriv->type->no_divisors)
734 baud_sup = baud;
735 else
736 baud_sup = pl2303_get_supported_baud_rate(baud);
737
738 if (baud == baud_sup)
739 baud = pl2303_encode_baud_rate_direct(buf, baud);
740 else if (spriv->type->alt_divisors)
741 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
742 else
743 baud = pl2303_encode_baud_rate_divisor(buf, baud);
744
745 /* Save resulting baud rate */
746 tty_encode_baud_rate(tty, baud, baud);
747 dev_dbg(&port->dev, "baud set = %u\n", baud);
748}
749
750static int pl2303_get_line_request(struct usb_serial_port *port,
751 unsigned char buf[7])
752{
753 struct usb_serial *serial = port->serial;
754 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
755 struct usb_device *udev = serial->dev;
756 int ret;
757
758 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE) {
759 struct pl2303_private *priv = usb_get_serial_port_data(port);
760
761 memcpy(buf, priv->line_settings, 7);
762 return 0;
763 }
764
765 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
766 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
767 0, 0, buf, 7, 100);
768 if (ret != 7) {
769 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
770
771 if (ret >= 0)
772 ret = -EIO;
773
774 return ret;
775 }
776
777 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
778
779 return 0;
780}
781
782static int pl2303_set_line_request(struct usb_serial_port *port,
783 unsigned char buf[7])
784{
785 struct usb_device *udev = port->serial->dev;
786 int ret;
787
788 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
789 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
790 0, 0, buf, 7, 100);
791 if (ret < 0) {
792 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
793 return ret;
794 }
795
796 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
797
798 return 0;
799}
800
801static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
802{
803 bool ixon_change;
804
805 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
806 a->c_cc[VSTART] != b->c_cc[VSTART] ||
807 a->c_cc[VSTOP] != b->c_cc[VSTOP];
808
809 return tty_termios_hw_change(a, b) || ixon_change;
810}
811
812static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
813{
814 if (!I_IXON(tty) || I_IXANY(tty))
815 return false;
816
817 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
818 return false;
819
820 if (type->no_autoxonxoff)
821 return false;
822
823 return true;
824}
825
826static void pl2303_set_termios(struct tty_struct *tty,
827 struct usb_serial_port *port,
828 const struct ktermios *old_termios)
829{
830 struct usb_serial *serial = port->serial;
831 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
832 struct pl2303_private *priv = usb_get_serial_port_data(port);
833 unsigned long flags;
834 unsigned char *buf;
835 int ret;
836 u8 control;
837
838 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
839 return;
840
841 buf = kzalloc(7, GFP_KERNEL);
842 if (!buf) {
843 /* Report back no change occurred */
844 if (old_termios)
845 tty->termios = *old_termios;
846 return;
847 }
848
849 pl2303_get_line_request(port, buf);
850
851 buf[6] = tty_get_char_size(tty->termios.c_cflag);
852 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
853
854 /* For reference buf[0]:buf[3] baud rate value */
855 pl2303_encode_baud_rate(tty, port, &buf[0]);
856
857 /* For reference buf[4]=0 is 1 stop bits */
858 /* For reference buf[4]=1 is 1.5 stop bits */
859 /* For reference buf[4]=2 is 2 stop bits */
860 if (C_CSTOPB(tty)) {
861 /*
862 * NOTE: Comply with "real" UARTs / RS232:
863 * use 1.5 instead of 2 stop bits with 5 data bits
864 */
865 if (C_CSIZE(tty) == CS5) {
866 buf[4] = 1;
867 dev_dbg(&port->dev, "stop bits = 1.5\n");
868 } else {
869 buf[4] = 2;
870 dev_dbg(&port->dev, "stop bits = 2\n");
871 }
872 } else {
873 buf[4] = 0;
874 dev_dbg(&port->dev, "stop bits = 1\n");
875 }
876
877 if (C_PARENB(tty)) {
878 /* For reference buf[5]=0 is none parity */
879 /* For reference buf[5]=1 is odd parity */
880 /* For reference buf[5]=2 is even parity */
881 /* For reference buf[5]=3 is mark parity */
882 /* For reference buf[5]=4 is space parity */
883 if (C_PARODD(tty)) {
884 if (C_CMSPAR(tty)) {
885 buf[5] = 3;
886 dev_dbg(&port->dev, "parity = mark\n");
887 } else {
888 buf[5] = 1;
889 dev_dbg(&port->dev, "parity = odd\n");
890 }
891 } else {
892 if (C_CMSPAR(tty)) {
893 buf[5] = 4;
894 dev_dbg(&port->dev, "parity = space\n");
895 } else {
896 buf[5] = 2;
897 dev_dbg(&port->dev, "parity = even\n");
898 }
899 }
900 } else {
901 buf[5] = 0;
902 dev_dbg(&port->dev, "parity = none\n");
903 }
904
905 /*
906 * Some PL2303 are known to lose bytes if you change serial settings
907 * even to the same values as before. Thus we actually need to filter
908 * in this specific case.
909 *
910 * Note that the tty_termios_hw_change check above is not sufficient
911 * as a previously requested baud rate may differ from the one
912 * actually used (and stored in old_termios).
913 *
914 * NOTE: No additional locking needed for line_settings as it is
915 * only used in set_termios, which is serialised against itself.
916 */
917 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
918 ret = pl2303_set_line_request(port, buf);
919 if (!ret)
920 memcpy(priv->line_settings, buf, 7);
921 }
922
923 /* change control lines if we are switching to or from B0 */
924 spin_lock_irqsave(&priv->lock, flags);
925 control = priv->line_control;
926 if (C_BAUD(tty) == B0)
927 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
928 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
929 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
930 if (control != priv->line_control) {
931 control = priv->line_control;
932 spin_unlock_irqrestore(&priv->lock, flags);
933 pl2303_set_control_lines(port, control);
934 } else {
935 spin_unlock_irqrestore(&priv->lock, flags);
936 }
937
938 if (C_CRTSCTS(tty)) {
939 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
940 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
941 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
942 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
943 PL2303_HXN_FLOWCTRL_MASK,
944 PL2303_HXN_FLOWCTRL_RTS_CTS);
945 } else {
946 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
947 }
948 } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
949 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
950 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
951 PL2303_HXN_FLOWCTRL_MASK,
952 PL2303_HXN_FLOWCTRL_XON_XOFF);
953 } else {
954 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
955 }
956 } else {
957 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
958 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
959 PL2303_HXN_FLOWCTRL_MASK,
960 PL2303_HXN_FLOWCTRL_NONE);
961 } else {
962 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
963 }
964 }
965
966 kfree(buf);
967}
968
969static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
970{
971 struct pl2303_private *priv = usb_get_serial_port_data(port);
972 unsigned long flags;
973 u8 control;
974
975 spin_lock_irqsave(&priv->lock, flags);
976 if (on)
977 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
978 else
979 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
980 control = priv->line_control;
981 spin_unlock_irqrestore(&priv->lock, flags);
982
983 pl2303_set_control_lines(port, control);
984}
985
986static void pl2303_close(struct usb_serial_port *port)
987{
988 usb_serial_generic_close(port);
989 usb_kill_urb(port->interrupt_in_urb);
990 pl2303_set_break(port, false);
991}
992
993static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
994{
995 struct usb_serial *serial = port->serial;
996 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
997 int result;
998
999 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
1000 usb_clear_halt(serial->dev, port->write_urb->pipe);
1001 usb_clear_halt(serial->dev, port->read_urb->pipe);
1002 } else {
1003 /* reset upstream data pipes */
1004 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
1005 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
1006 PL2303_HXN_RESET_UPSTREAM_PIPE |
1007 PL2303_HXN_RESET_DOWNSTREAM_PIPE);
1008 } else {
1009 pl2303_vendor_write(serial, 8, 0);
1010 pl2303_vendor_write(serial, 9, 0);
1011 }
1012 }
1013
1014 /* Setup termios */
1015 if (tty)
1016 pl2303_set_termios(tty, port, NULL);
1017
1018 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1019 if (result) {
1020 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
1021 result);
1022 return result;
1023 }
1024
1025 result = usb_serial_generic_open(tty, port);
1026 if (result) {
1027 usb_kill_urb(port->interrupt_in_urb);
1028 return result;
1029 }
1030
1031 return 0;
1032}
1033
1034static int pl2303_tiocmset(struct tty_struct *tty,
1035 unsigned int set, unsigned int clear)
1036{
1037 struct usb_serial_port *port = tty->driver_data;
1038 struct pl2303_private *priv = usb_get_serial_port_data(port);
1039 unsigned long flags;
1040 u8 control;
1041 int ret;
1042
1043 spin_lock_irqsave(&priv->lock, flags);
1044 if (set & TIOCM_RTS)
1045 priv->line_control |= CONTROL_RTS;
1046 if (set & TIOCM_DTR)
1047 priv->line_control |= CONTROL_DTR;
1048 if (clear & TIOCM_RTS)
1049 priv->line_control &= ~CONTROL_RTS;
1050 if (clear & TIOCM_DTR)
1051 priv->line_control &= ~CONTROL_DTR;
1052 control = priv->line_control;
1053 spin_unlock_irqrestore(&priv->lock, flags);
1054
1055 ret = pl2303_set_control_lines(port, control);
1056 if (ret)
1057 return usb_translate_errors(ret);
1058
1059 return 0;
1060}
1061
1062static int pl2303_tiocmget(struct tty_struct *tty)
1063{
1064 struct usb_serial_port *port = tty->driver_data;
1065 struct pl2303_private *priv = usb_get_serial_port_data(port);
1066 unsigned long flags;
1067 unsigned int mcr;
1068 unsigned int status;
1069 unsigned int result;
1070
1071 spin_lock_irqsave(&priv->lock, flags);
1072 mcr = priv->line_control;
1073 status = priv->line_status;
1074 spin_unlock_irqrestore(&priv->lock, flags);
1075
1076 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
1077 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
1078 | ((status & UART_CTS) ? TIOCM_CTS : 0)
1079 | ((status & UART_DSR) ? TIOCM_DSR : 0)
1080 | ((status & UART_RING) ? TIOCM_RI : 0)
1081 | ((status & UART_DCD) ? TIOCM_CD : 0);
1082
1083 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1084
1085 return result;
1086}
1087
1088static int pl2303_carrier_raised(struct usb_serial_port *port)
1089{
1090 struct pl2303_private *priv = usb_get_serial_port_data(port);
1091
1092 if (priv->line_status & UART_DCD)
1093 return 1;
1094
1095 return 0;
1096}
1097
1098static int pl2303_set_break(struct usb_serial_port *port, bool enable)
1099{
1100 struct usb_serial *serial = port->serial;
1101 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1102 u16 state;
1103 int result;
1104
1105 if (spriv->quirks & PL2303_QUIRK_NO_BREAK_GETLINE)
1106 return -ENOTTY;
1107
1108 if (enable)
1109 state = BREAK_ON;
1110 else
1111 state = BREAK_OFF;
1112
1113 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1114 state == BREAK_OFF ? "off" : "on");
1115
1116 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1117 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1118 0, NULL, 0, 100);
1119 if (result) {
1120 dev_err(&port->dev, "error sending break = %d\n", result);
1121 return result;
1122 }
1123
1124 return 0;
1125}
1126
1127static int pl2303_break_ctl(struct tty_struct *tty, int state)
1128{
1129 struct usb_serial_port *port = tty->driver_data;
1130
1131 return pl2303_set_break(port, state);
1132}
1133
1134static void pl2303_update_line_status(struct usb_serial_port *port,
1135 unsigned char *data,
1136 unsigned int actual_length)
1137{
1138 struct usb_serial *serial = port->serial;
1139 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1140 struct pl2303_private *priv = usb_get_serial_port_data(port);
1141 struct tty_struct *tty;
1142 unsigned long flags;
1143 unsigned int status_idx = UART_STATE_INDEX;
1144 u8 status;
1145 u8 delta;
1146
1147 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1148 status_idx = 0;
1149
1150 if (actual_length < status_idx + 1)
1151 return;
1152
1153 status = data[status_idx];
1154
1155 /* Save off the uart status for others to look at */
1156 spin_lock_irqsave(&priv->lock, flags);
1157 delta = priv->line_status ^ status;
1158 priv->line_status = status;
1159 spin_unlock_irqrestore(&priv->lock, flags);
1160
1161 if (status & UART_BREAK_ERROR)
1162 usb_serial_handle_break(port);
1163
1164 if (delta & UART_STATE_MSR_MASK) {
1165 if (delta & UART_CTS)
1166 port->icount.cts++;
1167 if (delta & UART_DSR)
1168 port->icount.dsr++;
1169 if (delta & UART_RING)
1170 port->icount.rng++;
1171 if (delta & UART_DCD) {
1172 port->icount.dcd++;
1173 tty = tty_port_tty_get(&port->port);
1174 if (tty) {
1175 usb_serial_handle_dcd_change(port, tty,
1176 status & UART_DCD);
1177 tty_kref_put(tty);
1178 }
1179 }
1180
1181 wake_up_interruptible(&port->port.delta_msr_wait);
1182 }
1183}
1184
1185static void pl2303_read_int_callback(struct urb *urb)
1186{
1187 struct usb_serial_port *port = urb->context;
1188 unsigned char *data = urb->transfer_buffer;
1189 unsigned int actual_length = urb->actual_length;
1190 int status = urb->status;
1191 int retval;
1192
1193 switch (status) {
1194 case 0:
1195 /* success */
1196 break;
1197 case -ECONNRESET:
1198 case -ENOENT:
1199 case -ESHUTDOWN:
1200 /* this urb is terminated, clean up */
1201 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1202 __func__, status);
1203 return;
1204 default:
1205 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1206 __func__, status);
1207 goto exit;
1208 }
1209
1210 usb_serial_debug_data(&port->dev, __func__,
1211 urb->actual_length, urb->transfer_buffer);
1212
1213 pl2303_update_line_status(port, data, actual_length);
1214
1215exit:
1216 retval = usb_submit_urb(urb, GFP_ATOMIC);
1217 if (retval) {
1218 dev_err(&port->dev,
1219 "%s - usb_submit_urb failed with result %d\n",
1220 __func__, retval);
1221 }
1222}
1223
1224static void pl2303_process_read_urb(struct urb *urb)
1225{
1226 struct usb_serial_port *port = urb->context;
1227 struct pl2303_private *priv = usb_get_serial_port_data(port);
1228 unsigned char *data = urb->transfer_buffer;
1229 char tty_flag = TTY_NORMAL;
1230 unsigned long flags;
1231 u8 line_status;
1232 int i;
1233
1234 /* update line status */
1235 spin_lock_irqsave(&priv->lock, flags);
1236 line_status = priv->line_status;
1237 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1238 spin_unlock_irqrestore(&priv->lock, flags);
1239
1240 if (!urb->actual_length)
1241 return;
1242
1243 /*
1244 * Break takes precedence over parity, which takes precedence over
1245 * framing errors.
1246 */
1247 if (line_status & UART_BREAK_ERROR)
1248 tty_flag = TTY_BREAK;
1249 else if (line_status & UART_PARITY_ERROR)
1250 tty_flag = TTY_PARITY;
1251 else if (line_status & UART_FRAME_ERROR)
1252 tty_flag = TTY_FRAME;
1253
1254 if (tty_flag != TTY_NORMAL)
1255 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1256 tty_flag);
1257 /* overrun is special, not associated with a char */
1258 if (line_status & UART_OVERRUN_ERROR)
1259 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1260
1261 if (port->sysrq) {
1262 for (i = 0; i < urb->actual_length; ++i)
1263 if (!usb_serial_handle_sysrq_char(port, data[i]))
1264 tty_insert_flip_char(&port->port, data[i],
1265 tty_flag);
1266 } else {
1267 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1268 urb->actual_length);
1269 }
1270
1271 tty_flip_buffer_push(&port->port);
1272}
1273
1274static struct usb_serial_driver pl2303_device = {
1275 .driver = {
1276 .name = "pl2303",
1277 },
1278 .id_table = id_table,
1279 .num_bulk_in = 1,
1280 .num_bulk_out = 1,
1281 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
1282 .bulk_in_size = 256,
1283 .bulk_out_size = 256,
1284 .open = pl2303_open,
1285 .close = pl2303_close,
1286 .dtr_rts = pl2303_dtr_rts,
1287 .carrier_raised = pl2303_carrier_raised,
1288 .break_ctl = pl2303_break_ctl,
1289 .set_termios = pl2303_set_termios,
1290 .tiocmget = pl2303_tiocmget,
1291 .tiocmset = pl2303_tiocmset,
1292 .tiocmiwait = usb_serial_generic_tiocmiwait,
1293 .process_read_urb = pl2303_process_read_urb,
1294 .read_int_callback = pl2303_read_int_callback,
1295 .probe = pl2303_probe,
1296 .calc_num_ports = pl2303_calc_num_ports,
1297 .attach = pl2303_startup,
1298 .release = pl2303_release,
1299 .port_probe = pl2303_port_probe,
1300 .port_remove = pl2303_port_remove,
1301};
1302
1303static struct usb_serial_driver * const serial_drivers[] = {
1304 &pl2303_device, NULL
1305};
1306
1307module_usb_serial_driver(serial_drivers, id_table);
1308
1309MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1310MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)