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
35 static 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_LM930_PRODUCT_ID) },
110 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
111 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
112 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
113 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
114 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
115 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
116 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
117 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
118 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
119 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
120 { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
121 { } /* Terminating entry */
122 };
123
124 MODULE_DEVICE_TABLE(usb, id_table);
125
126 #define SET_LINE_REQUEST_TYPE 0x21
127 #define SET_LINE_REQUEST 0x20
128
129 #define SET_CONTROL_REQUEST_TYPE 0x21
130 #define SET_CONTROL_REQUEST 0x22
131 #define CONTROL_DTR 0x01
132 #define CONTROL_RTS 0x02
133
134 #define BREAK_REQUEST_TYPE 0x21
135 #define BREAK_REQUEST 0x23
136 #define BREAK_ON 0xffff
137 #define BREAK_OFF 0x0000
138
139 #define GET_LINE_REQUEST_TYPE 0xa1
140 #define GET_LINE_REQUEST 0x21
141
142 #define VENDOR_WRITE_REQUEST_TYPE 0x40
143 #define VENDOR_WRITE_REQUEST 0x01
144 #define VENDOR_WRITE_NREQUEST 0x80
145
146 #define VENDOR_READ_REQUEST_TYPE 0xc0
147 #define VENDOR_READ_REQUEST 0x01
148 #define VENDOR_READ_NREQUEST 0x81
149
150 #define UART_STATE_INDEX 8
151 #define UART_STATE_MSR_MASK 0x8b
152 #define UART_STATE_TRANSIENT_MASK 0x74
153 #define UART_DCD 0x01
154 #define UART_DSR 0x02
155 #define UART_BREAK_ERROR 0x04
156 #define UART_RING 0x08
157 #define UART_FRAME_ERROR 0x10
158 #define UART_PARITY_ERROR 0x20
159 #define UART_OVERRUN_ERROR 0x40
160 #define UART_CTS 0x80
161
162 #define PL2303_FLOWCTRL_MASK 0xf0
163
164 #define PL2303_READ_TYPE_HX_STATUS 0x8080
165
166 #define PL2303_HXN_RESET_REG 0x07
167 #define PL2303_HXN_RESET_UPSTREAM_PIPE 0x02
168 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE 0x01
169
170 #define PL2303_HXN_FLOWCTRL_REG 0x0a
171 #define PL2303_HXN_FLOWCTRL_MASK 0x1c
172 #define PL2303_HXN_FLOWCTRL_NONE 0x1c
173 #define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18
174 #define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c
175
176 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
177
178 enum pl2303_type {
179 TYPE_H,
180 TYPE_HX,
181 TYPE_TA,
182 TYPE_TB,
183 TYPE_HXD,
184 TYPE_HXN,
185 TYPE_COUNT
186 };
187
188 struct pl2303_type_data {
189 const char *name;
190 speed_t max_baud_rate;
191 unsigned long quirks;
192 unsigned int no_autoxonxoff:1;
193 unsigned int no_divisors:1;
194 unsigned int alt_divisors:1;
195 };
196
197 struct pl2303_serial_private {
198 const struct pl2303_type_data *type;
199 unsigned long quirks;
200 };
201
202 struct pl2303_private {
203 spinlock_t lock;
204 u8 line_control;
205 u8 line_status;
206
207 u8 line_settings[7];
208 };
209
210 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
211 [TYPE_H] = {
212 .name = "H",
213 .max_baud_rate = 1228800,
214 .quirks = PL2303_QUIRK_LEGACY,
215 .no_autoxonxoff = true,
216 },
217 [TYPE_HX] = {
218 .name = "HX",
219 .max_baud_rate = 6000000,
220 },
221 [TYPE_TA] = {
222 .name = "TA",
223 .max_baud_rate = 6000000,
224 .alt_divisors = true,
225 },
226 [TYPE_TB] = {
227 .name = "TB",
228 .max_baud_rate = 12000000,
229 .alt_divisors = true,
230 },
231 [TYPE_HXD] = {
232 .name = "HXD",
233 .max_baud_rate = 12000000,
234 },
235 [TYPE_HXN] = {
236 .name = "G",
237 .max_baud_rate = 12000000,
238 .no_divisors = true,
239 },
240 };
241
pl2303_vendor_read(struct usb_serial * serial,u16 value,unsigned char buf[1])242 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
243 unsigned char buf[1])
244 {
245 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
246 struct device *dev = &serial->interface->dev;
247 u8 request;
248 int res;
249
250 if (spriv->type == &pl2303_type_data[TYPE_HXN])
251 request = VENDOR_READ_NREQUEST;
252 else
253 request = VENDOR_READ_REQUEST;
254
255 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
256 request, VENDOR_READ_REQUEST_TYPE,
257 value, 0, buf, 1, 100);
258 if (res != 1) {
259 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
260 value, res);
261 if (res >= 0)
262 res = -EIO;
263
264 return res;
265 }
266
267 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
268
269 return 0;
270 }
271
pl2303_vendor_write(struct usb_serial * serial,u16 value,u16 index)272 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
273 {
274 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
275 struct device *dev = &serial->interface->dev;
276 u8 request;
277 int res;
278
279 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
280
281 if (spriv->type == &pl2303_type_data[TYPE_HXN])
282 request = VENDOR_WRITE_NREQUEST;
283 else
284 request = VENDOR_WRITE_REQUEST;
285
286 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
287 request, VENDOR_WRITE_REQUEST_TYPE,
288 value, index, NULL, 0, 100);
289 if (res) {
290 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
291 value, res);
292 return res;
293 }
294
295 return 0;
296 }
297
pl2303_update_reg(struct usb_serial * serial,u8 reg,u8 mask,u8 val)298 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
299 {
300 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
301 int ret = 0;
302 u8 *buf;
303
304 buf = kmalloc(1, GFP_KERNEL);
305 if (!buf)
306 return -ENOMEM;
307
308 if (spriv->type == &pl2303_type_data[TYPE_HXN])
309 ret = pl2303_vendor_read(serial, reg, buf);
310 else
311 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
312
313 if (ret)
314 goto out_free;
315
316 *buf &= ~mask;
317 *buf |= val & mask;
318
319 ret = pl2303_vendor_write(serial, reg, *buf);
320 out_free:
321 kfree(buf);
322
323 return ret;
324 }
325
pl2303_probe(struct usb_serial * serial,const struct usb_device_id * id)326 static int pl2303_probe(struct usb_serial *serial,
327 const struct usb_device_id *id)
328 {
329 usb_set_serial_data(serial, (void *)id->driver_info);
330
331 return 0;
332 }
333
334 /*
335 * Use interrupt endpoint from first interface if available.
336 *
337 * This is needed due to the looney way its endpoints are set up.
338 */
pl2303_endpoint_hack(struct usb_serial * serial,struct usb_serial_endpoints * epds)339 static int pl2303_endpoint_hack(struct usb_serial *serial,
340 struct usb_serial_endpoints *epds)
341 {
342 struct usb_interface *interface = serial->interface;
343 struct usb_device *dev = serial->dev;
344 struct device *ddev = &interface->dev;
345 struct usb_host_interface *iface_desc;
346 struct usb_endpoint_descriptor *endpoint;
347 unsigned int i;
348
349 if (interface == dev->actconfig->interface[0])
350 return 0;
351
352 /* check out the endpoints of the other interface */
353 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
354
355 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
356 endpoint = &iface_desc->endpoint[i].desc;
357
358 if (!usb_endpoint_is_int_in(endpoint))
359 continue;
360
361 dev_dbg(ddev, "found interrupt in on separate interface\n");
362 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
363 epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
364 }
365
366 return 0;
367 }
368
pl2303_calc_num_ports(struct usb_serial * serial,struct usb_serial_endpoints * epds)369 static int pl2303_calc_num_ports(struct usb_serial *serial,
370 struct usb_serial_endpoints *epds)
371 {
372 unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
373 struct device *dev = &serial->interface->dev;
374 int ret;
375
376 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
377 ret = pl2303_endpoint_hack(serial, epds);
378 if (ret)
379 return ret;
380 }
381
382 if (epds->num_interrupt_in < 1) {
383 dev_err(dev, "required interrupt-in endpoint missing\n");
384 return -ENODEV;
385 }
386
387 return 1;
388 }
389
pl2303_supports_hx_status(struct usb_serial * serial)390 static bool pl2303_supports_hx_status(struct usb_serial *serial)
391 {
392 int ret;
393 u8 buf;
394
395 ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
396 VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
397 0, &buf, 1, 100, GFP_KERNEL);
398
399 return ret == 0;
400 }
401
pl2303_detect_type(struct usb_serial * serial)402 static int pl2303_detect_type(struct usb_serial *serial)
403 {
404 struct usb_device_descriptor *desc = &serial->dev->descriptor;
405 u16 bcdDevice, bcdUSB;
406
407 /*
408 * Legacy PL2303H, variants 0 and 1 (difference unknown).
409 */
410 if (desc->bDeviceClass == 0x02)
411 return TYPE_H; /* variant 0 */
412
413 if (desc->bMaxPacketSize0 != 0x40) {
414 if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
415 return TYPE_H; /* variant 1 */
416
417 return TYPE_H; /* variant 0 */
418 }
419
420 bcdDevice = le16_to_cpu(desc->bcdDevice);
421 bcdUSB = le16_to_cpu(desc->bcdUSB);
422
423 switch (bcdUSB) {
424 case 0x101:
425 /* USB 1.0.1? Let's assume they meant 1.1... */
426 fallthrough;
427 case 0x110:
428 switch (bcdDevice) {
429 case 0x300:
430 return TYPE_HX;
431 case 0x400:
432 return TYPE_HXD;
433 default:
434 return TYPE_HX;
435 }
436 break;
437 case 0x200:
438 switch (bcdDevice) {
439 case 0x100: /* GC */
440 case 0x105:
441 return TYPE_HXN;
442 case 0x300: /* GT / TA */
443 if (pl2303_supports_hx_status(serial))
444 return TYPE_TA;
445 fallthrough;
446 case 0x305:
447 case 0x400: /* GL */
448 case 0x405:
449 return TYPE_HXN;
450 case 0x500: /* GE / TB */
451 if (pl2303_supports_hx_status(serial))
452 return TYPE_TB;
453 fallthrough;
454 case 0x505:
455 case 0x600: /* GS */
456 case 0x605:
457 case 0x700: /* GR */
458 case 0x705:
459 return TYPE_HXN;
460 }
461 break;
462 }
463
464 dev_err(&serial->interface->dev,
465 "unknown device type, please report to linux-usb@vger.kernel.org\n");
466 return -ENODEV;
467 }
468
pl2303_startup(struct usb_serial * serial)469 static int pl2303_startup(struct usb_serial *serial)
470 {
471 struct pl2303_serial_private *spriv;
472 enum pl2303_type type;
473 unsigned char *buf;
474 int ret;
475
476 ret = pl2303_detect_type(serial);
477 if (ret < 0)
478 return ret;
479
480 type = ret;
481 dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
482
483 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
484 if (!spriv)
485 return -ENOMEM;
486
487 spriv->type = &pl2303_type_data[type];
488 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
489 spriv->quirks |= spriv->type->quirks;
490
491 usb_set_serial_data(serial, spriv);
492
493 if (type != TYPE_HXN) {
494 buf = kmalloc(1, GFP_KERNEL);
495 if (!buf) {
496 kfree(spriv);
497 return -ENOMEM;
498 }
499
500 pl2303_vendor_read(serial, 0x8484, buf);
501 pl2303_vendor_write(serial, 0x0404, 0);
502 pl2303_vendor_read(serial, 0x8484, buf);
503 pl2303_vendor_read(serial, 0x8383, buf);
504 pl2303_vendor_read(serial, 0x8484, buf);
505 pl2303_vendor_write(serial, 0x0404, 1);
506 pl2303_vendor_read(serial, 0x8484, buf);
507 pl2303_vendor_read(serial, 0x8383, buf);
508 pl2303_vendor_write(serial, 0, 1);
509 pl2303_vendor_write(serial, 1, 0);
510 if (spriv->quirks & PL2303_QUIRK_LEGACY)
511 pl2303_vendor_write(serial, 2, 0x24);
512 else
513 pl2303_vendor_write(serial, 2, 0x44);
514
515 kfree(buf);
516 }
517
518 return 0;
519 }
520
pl2303_release(struct usb_serial * serial)521 static void pl2303_release(struct usb_serial *serial)
522 {
523 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
524
525 kfree(spriv);
526 }
527
pl2303_port_probe(struct usb_serial_port * port)528 static int pl2303_port_probe(struct usb_serial_port *port)
529 {
530 struct pl2303_private *priv;
531
532 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
533 if (!priv)
534 return -ENOMEM;
535
536 spin_lock_init(&priv->lock);
537
538 usb_set_serial_port_data(port, priv);
539
540 port->port.drain_delay = 256;
541
542 return 0;
543 }
544
pl2303_port_remove(struct usb_serial_port * port)545 static void pl2303_port_remove(struct usb_serial_port *port)
546 {
547 struct pl2303_private *priv = usb_get_serial_port_data(port);
548
549 kfree(priv);
550 }
551
pl2303_set_control_lines(struct usb_serial_port * port,u8 value)552 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
553 {
554 struct usb_device *dev = port->serial->dev;
555 int retval;
556
557 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
558
559 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
560 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
561 value, 0, NULL, 0, 100);
562 if (retval)
563 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
564
565 return retval;
566 }
567
568 /*
569 * Returns the nearest supported baud rate that can be set directly without
570 * using divisors.
571 */
pl2303_get_supported_baud_rate(speed_t baud)572 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
573 {
574 static const speed_t baud_sup[] = {
575 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
576 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
577 614400, 921600, 1228800, 2457600, 3000000, 6000000
578 };
579
580 unsigned i;
581
582 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
583 if (baud_sup[i] > baud)
584 break;
585 }
586
587 if (i == ARRAY_SIZE(baud_sup))
588 baud = baud_sup[i - 1];
589 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
590 baud = baud_sup[i - 1];
591 else
592 baud = baud_sup[i];
593
594 return baud;
595 }
596
597 /*
598 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
599 * use 9600 baud.
600 */
pl2303_encode_baud_rate_direct(unsigned char buf[4],speed_t baud)601 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
602 speed_t baud)
603 {
604 put_unaligned_le32(baud, buf);
605
606 return baud;
607 }
608
pl2303_encode_baud_rate_divisor(unsigned char buf[4],speed_t baud)609 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
610 speed_t baud)
611 {
612 unsigned int baseline, mantissa, exponent;
613
614 /*
615 * Apparently the formula is:
616 * baudrate = 12M * 32 / (mantissa * 4^exponent)
617 * where
618 * mantissa = buf[8:0]
619 * exponent = buf[11:9]
620 */
621 baseline = 12000000 * 32;
622 mantissa = baseline / baud;
623 if (mantissa == 0)
624 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
625 exponent = 0;
626 while (mantissa >= 512) {
627 if (exponent < 7) {
628 mantissa >>= 2; /* divide by 4 */
629 exponent++;
630 } else {
631 /* Exponent is maxed. Trim mantissa and leave. */
632 mantissa = 511;
633 break;
634 }
635 }
636
637 buf[3] = 0x80;
638 buf[2] = 0;
639 buf[1] = exponent << 1 | mantissa >> 8;
640 buf[0] = mantissa & 0xff;
641
642 /* Calculate and return the exact baud rate. */
643 baud = (baseline / mantissa) >> (exponent << 1);
644
645 return baud;
646 }
647
pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],speed_t baud)648 static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
649 speed_t baud)
650 {
651 unsigned int baseline, mantissa, exponent;
652
653 /*
654 * Apparently, for the TA version the formula is:
655 * baudrate = 12M * 32 / (mantissa * 2^exponent)
656 * where
657 * mantissa = buf[10:0]
658 * exponent = buf[15:13 16]
659 */
660 baseline = 12000000 * 32;
661 mantissa = baseline / baud;
662 if (mantissa == 0)
663 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
664 exponent = 0;
665 while (mantissa >= 2048) {
666 if (exponent < 15) {
667 mantissa >>= 1; /* divide by 2 */
668 exponent++;
669 } else {
670 /* Exponent is maxed. Trim mantissa and leave. */
671 mantissa = 2047;
672 break;
673 }
674 }
675
676 buf[3] = 0x80;
677 buf[2] = exponent & 0x01;
678 buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
679 buf[0] = mantissa & 0xff;
680
681 /* Calculate and return the exact baud rate. */
682 baud = (baseline / mantissa) >> exponent;
683
684 return baud;
685 }
686
pl2303_encode_baud_rate(struct tty_struct * tty,struct usb_serial_port * port,u8 buf[4])687 static void pl2303_encode_baud_rate(struct tty_struct *tty,
688 struct usb_serial_port *port,
689 u8 buf[4])
690 {
691 struct usb_serial *serial = port->serial;
692 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
693 speed_t baud_sup;
694 speed_t baud;
695
696 baud = tty_get_baud_rate(tty);
697 dev_dbg(&port->dev, "baud requested = %u\n", baud);
698 if (!baud)
699 return;
700
701 if (spriv->type->max_baud_rate)
702 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
703 /*
704 * Use direct method for supported baud rates, otherwise use divisors.
705 * Newer chip types do not support divisor encoding.
706 */
707 if (spriv->type->no_divisors)
708 baud_sup = baud;
709 else
710 baud_sup = pl2303_get_supported_baud_rate(baud);
711
712 if (baud == baud_sup)
713 baud = pl2303_encode_baud_rate_direct(buf, baud);
714 else if (spriv->type->alt_divisors)
715 baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
716 else
717 baud = pl2303_encode_baud_rate_divisor(buf, baud);
718
719 /* Save resulting baud rate */
720 tty_encode_baud_rate(tty, baud, baud);
721 dev_dbg(&port->dev, "baud set = %u\n", baud);
722 }
723
pl2303_get_line_request(struct usb_serial_port * port,unsigned char buf[7])724 static int pl2303_get_line_request(struct usb_serial_port *port,
725 unsigned char buf[7])
726 {
727 struct usb_device *udev = port->serial->dev;
728 int ret;
729
730 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
731 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
732 0, 0, buf, 7, 100);
733 if (ret != 7) {
734 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
735
736 if (ret >= 0)
737 ret = -EIO;
738
739 return ret;
740 }
741
742 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
743
744 return 0;
745 }
746
pl2303_set_line_request(struct usb_serial_port * port,unsigned char buf[7])747 static int pl2303_set_line_request(struct usb_serial_port *port,
748 unsigned char buf[7])
749 {
750 struct usb_device *udev = port->serial->dev;
751 int ret;
752
753 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
754 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
755 0, 0, buf, 7, 100);
756 if (ret < 0) {
757 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
758 return ret;
759 }
760
761 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
762
763 return 0;
764 }
765
pl2303_termios_change(const struct ktermios * a,const struct ktermios * b)766 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
767 {
768 bool ixon_change;
769
770 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
771 a->c_cc[VSTART] != b->c_cc[VSTART] ||
772 a->c_cc[VSTOP] != b->c_cc[VSTOP];
773
774 return tty_termios_hw_change(a, b) || ixon_change;
775 }
776
pl2303_enable_xonxoff(struct tty_struct * tty,const struct pl2303_type_data * type)777 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
778 {
779 if (!I_IXON(tty) || I_IXANY(tty))
780 return false;
781
782 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
783 return false;
784
785 if (type->no_autoxonxoff)
786 return false;
787
788 return true;
789 }
790
pl2303_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)791 static void pl2303_set_termios(struct tty_struct *tty,
792 struct usb_serial_port *port,
793 const struct ktermios *old_termios)
794 {
795 struct usb_serial *serial = port->serial;
796 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
797 struct pl2303_private *priv = usb_get_serial_port_data(port);
798 unsigned long flags;
799 unsigned char *buf;
800 int ret;
801 u8 control;
802
803 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
804 return;
805
806 buf = kzalloc(7, GFP_KERNEL);
807 if (!buf) {
808 /* Report back no change occurred */
809 if (old_termios)
810 tty->termios = *old_termios;
811 return;
812 }
813
814 pl2303_get_line_request(port, buf);
815
816 buf[6] = tty_get_char_size(tty->termios.c_cflag);
817 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
818
819 /* For reference buf[0]:buf[3] baud rate value */
820 pl2303_encode_baud_rate(tty, port, &buf[0]);
821
822 /* For reference buf[4]=0 is 1 stop bits */
823 /* For reference buf[4]=1 is 1.5 stop bits */
824 /* For reference buf[4]=2 is 2 stop bits */
825 if (C_CSTOPB(tty)) {
826 /*
827 * NOTE: Comply with "real" UARTs / RS232:
828 * use 1.5 instead of 2 stop bits with 5 data bits
829 */
830 if (C_CSIZE(tty) == CS5) {
831 buf[4] = 1;
832 dev_dbg(&port->dev, "stop bits = 1.5\n");
833 } else {
834 buf[4] = 2;
835 dev_dbg(&port->dev, "stop bits = 2\n");
836 }
837 } else {
838 buf[4] = 0;
839 dev_dbg(&port->dev, "stop bits = 1\n");
840 }
841
842 if (C_PARENB(tty)) {
843 /* For reference buf[5]=0 is none parity */
844 /* For reference buf[5]=1 is odd parity */
845 /* For reference buf[5]=2 is even parity */
846 /* For reference buf[5]=3 is mark parity */
847 /* For reference buf[5]=4 is space parity */
848 if (C_PARODD(tty)) {
849 if (C_CMSPAR(tty)) {
850 buf[5] = 3;
851 dev_dbg(&port->dev, "parity = mark\n");
852 } else {
853 buf[5] = 1;
854 dev_dbg(&port->dev, "parity = odd\n");
855 }
856 } else {
857 if (C_CMSPAR(tty)) {
858 buf[5] = 4;
859 dev_dbg(&port->dev, "parity = space\n");
860 } else {
861 buf[5] = 2;
862 dev_dbg(&port->dev, "parity = even\n");
863 }
864 }
865 } else {
866 buf[5] = 0;
867 dev_dbg(&port->dev, "parity = none\n");
868 }
869
870 /*
871 * Some PL2303 are known to lose bytes if you change serial settings
872 * even to the same values as before. Thus we actually need to filter
873 * in this specific case.
874 *
875 * Note that the tty_termios_hw_change check above is not sufficient
876 * as a previously requested baud rate may differ from the one
877 * actually used (and stored in old_termios).
878 *
879 * NOTE: No additional locking needed for line_settings as it is
880 * only used in set_termios, which is serialised against itself.
881 */
882 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
883 ret = pl2303_set_line_request(port, buf);
884 if (!ret)
885 memcpy(priv->line_settings, buf, 7);
886 }
887
888 /* change control lines if we are switching to or from B0 */
889 spin_lock_irqsave(&priv->lock, flags);
890 control = priv->line_control;
891 if (C_BAUD(tty) == B0)
892 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
893 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
894 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
895 if (control != priv->line_control) {
896 control = priv->line_control;
897 spin_unlock_irqrestore(&priv->lock, flags);
898 pl2303_set_control_lines(port, control);
899 } else {
900 spin_unlock_irqrestore(&priv->lock, flags);
901 }
902
903 if (C_CRTSCTS(tty)) {
904 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
905 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
906 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
907 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
908 PL2303_HXN_FLOWCTRL_MASK,
909 PL2303_HXN_FLOWCTRL_RTS_CTS);
910 } else {
911 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
912 }
913 } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
914 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
915 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
916 PL2303_HXN_FLOWCTRL_MASK,
917 PL2303_HXN_FLOWCTRL_XON_XOFF);
918 } else {
919 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
920 }
921 } else {
922 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
923 pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
924 PL2303_HXN_FLOWCTRL_MASK,
925 PL2303_HXN_FLOWCTRL_NONE);
926 } else {
927 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
928 }
929 }
930
931 kfree(buf);
932 }
933
pl2303_dtr_rts(struct usb_serial_port * port,int on)934 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
935 {
936 struct pl2303_private *priv = usb_get_serial_port_data(port);
937 unsigned long flags;
938 u8 control;
939
940 spin_lock_irqsave(&priv->lock, flags);
941 if (on)
942 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
943 else
944 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
945 control = priv->line_control;
946 spin_unlock_irqrestore(&priv->lock, flags);
947
948 pl2303_set_control_lines(port, control);
949 }
950
pl2303_close(struct usb_serial_port * port)951 static void pl2303_close(struct usb_serial_port *port)
952 {
953 usb_serial_generic_close(port);
954 usb_kill_urb(port->interrupt_in_urb);
955 pl2303_set_break(port, false);
956 }
957
pl2303_open(struct tty_struct * tty,struct usb_serial_port * port)958 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
959 {
960 struct usb_serial *serial = port->serial;
961 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
962 int result;
963
964 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
965 usb_clear_halt(serial->dev, port->write_urb->pipe);
966 usb_clear_halt(serial->dev, port->read_urb->pipe);
967 } else {
968 /* reset upstream data pipes */
969 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
970 pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
971 PL2303_HXN_RESET_UPSTREAM_PIPE |
972 PL2303_HXN_RESET_DOWNSTREAM_PIPE);
973 } else {
974 pl2303_vendor_write(serial, 8, 0);
975 pl2303_vendor_write(serial, 9, 0);
976 }
977 }
978
979 /* Setup termios */
980 if (tty)
981 pl2303_set_termios(tty, port, NULL);
982
983 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
984 if (result) {
985 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
986 result);
987 return result;
988 }
989
990 result = usb_serial_generic_open(tty, port);
991 if (result) {
992 usb_kill_urb(port->interrupt_in_urb);
993 return result;
994 }
995
996 return 0;
997 }
998
pl2303_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)999 static int pl2303_tiocmset(struct tty_struct *tty,
1000 unsigned int set, unsigned int clear)
1001 {
1002 struct usb_serial_port *port = tty->driver_data;
1003 struct pl2303_private *priv = usb_get_serial_port_data(port);
1004 unsigned long flags;
1005 u8 control;
1006 int ret;
1007
1008 spin_lock_irqsave(&priv->lock, flags);
1009 if (set & TIOCM_RTS)
1010 priv->line_control |= CONTROL_RTS;
1011 if (set & TIOCM_DTR)
1012 priv->line_control |= CONTROL_DTR;
1013 if (clear & TIOCM_RTS)
1014 priv->line_control &= ~CONTROL_RTS;
1015 if (clear & TIOCM_DTR)
1016 priv->line_control &= ~CONTROL_DTR;
1017 control = priv->line_control;
1018 spin_unlock_irqrestore(&priv->lock, flags);
1019
1020 ret = pl2303_set_control_lines(port, control);
1021 if (ret)
1022 return usb_translate_errors(ret);
1023
1024 return 0;
1025 }
1026
pl2303_tiocmget(struct tty_struct * tty)1027 static int pl2303_tiocmget(struct tty_struct *tty)
1028 {
1029 struct usb_serial_port *port = tty->driver_data;
1030 struct pl2303_private *priv = usb_get_serial_port_data(port);
1031 unsigned long flags;
1032 unsigned int mcr;
1033 unsigned int status;
1034 unsigned int result;
1035
1036 spin_lock_irqsave(&priv->lock, flags);
1037 mcr = priv->line_control;
1038 status = priv->line_status;
1039 spin_unlock_irqrestore(&priv->lock, flags);
1040
1041 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
1042 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
1043 | ((status & UART_CTS) ? TIOCM_CTS : 0)
1044 | ((status & UART_DSR) ? TIOCM_DSR : 0)
1045 | ((status & UART_RING) ? TIOCM_RI : 0)
1046 | ((status & UART_DCD) ? TIOCM_CD : 0);
1047
1048 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
1049
1050 return result;
1051 }
1052
pl2303_carrier_raised(struct usb_serial_port * port)1053 static int pl2303_carrier_raised(struct usb_serial_port *port)
1054 {
1055 struct pl2303_private *priv = usb_get_serial_port_data(port);
1056
1057 if (priv->line_status & UART_DCD)
1058 return 1;
1059
1060 return 0;
1061 }
1062
pl2303_set_break(struct usb_serial_port * port,bool enable)1063 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
1064 {
1065 struct usb_serial *serial = port->serial;
1066 u16 state;
1067 int result;
1068
1069 if (enable)
1070 state = BREAK_ON;
1071 else
1072 state = BREAK_OFF;
1073
1074 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1075 state == BREAK_OFF ? "off" : "on");
1076
1077 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1078 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
1079 0, NULL, 0, 100);
1080 if (result)
1081 dev_err(&port->dev, "error sending break = %d\n", result);
1082 }
1083
pl2303_break_ctl(struct tty_struct * tty,int state)1084 static void pl2303_break_ctl(struct tty_struct *tty, int state)
1085 {
1086 struct usb_serial_port *port = tty->driver_data;
1087
1088 pl2303_set_break(port, state);
1089 }
1090
pl2303_update_line_status(struct usb_serial_port * port,unsigned char * data,unsigned int actual_length)1091 static void pl2303_update_line_status(struct usb_serial_port *port,
1092 unsigned char *data,
1093 unsigned int actual_length)
1094 {
1095 struct usb_serial *serial = port->serial;
1096 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
1097 struct pl2303_private *priv = usb_get_serial_port_data(port);
1098 struct tty_struct *tty;
1099 unsigned long flags;
1100 unsigned int status_idx = UART_STATE_INDEX;
1101 u8 status;
1102 u8 delta;
1103
1104 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1105 status_idx = 0;
1106
1107 if (actual_length < status_idx + 1)
1108 return;
1109
1110 status = data[status_idx];
1111
1112 /* Save off the uart status for others to look at */
1113 spin_lock_irqsave(&priv->lock, flags);
1114 delta = priv->line_status ^ status;
1115 priv->line_status = status;
1116 spin_unlock_irqrestore(&priv->lock, flags);
1117
1118 if (status & UART_BREAK_ERROR)
1119 usb_serial_handle_break(port);
1120
1121 if (delta & UART_STATE_MSR_MASK) {
1122 if (delta & UART_CTS)
1123 port->icount.cts++;
1124 if (delta & UART_DSR)
1125 port->icount.dsr++;
1126 if (delta & UART_RING)
1127 port->icount.rng++;
1128 if (delta & UART_DCD) {
1129 port->icount.dcd++;
1130 tty = tty_port_tty_get(&port->port);
1131 if (tty) {
1132 usb_serial_handle_dcd_change(port, tty,
1133 status & UART_DCD);
1134 tty_kref_put(tty);
1135 }
1136 }
1137
1138 wake_up_interruptible(&port->port.delta_msr_wait);
1139 }
1140 }
1141
pl2303_read_int_callback(struct urb * urb)1142 static void pl2303_read_int_callback(struct urb *urb)
1143 {
1144 struct usb_serial_port *port = urb->context;
1145 unsigned char *data = urb->transfer_buffer;
1146 unsigned int actual_length = urb->actual_length;
1147 int status = urb->status;
1148 int retval;
1149
1150 switch (status) {
1151 case 0:
1152 /* success */
1153 break;
1154 case -ECONNRESET:
1155 case -ENOENT:
1156 case -ESHUTDOWN:
1157 /* this urb is terminated, clean up */
1158 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1159 __func__, status);
1160 return;
1161 default:
1162 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1163 __func__, status);
1164 goto exit;
1165 }
1166
1167 usb_serial_debug_data(&port->dev, __func__,
1168 urb->actual_length, urb->transfer_buffer);
1169
1170 pl2303_update_line_status(port, data, actual_length);
1171
1172 exit:
1173 retval = usb_submit_urb(urb, GFP_ATOMIC);
1174 if (retval) {
1175 dev_err(&port->dev,
1176 "%s - usb_submit_urb failed with result %d\n",
1177 __func__, retval);
1178 }
1179 }
1180
pl2303_process_read_urb(struct urb * urb)1181 static void pl2303_process_read_urb(struct urb *urb)
1182 {
1183 struct usb_serial_port *port = urb->context;
1184 struct pl2303_private *priv = usb_get_serial_port_data(port);
1185 unsigned char *data = urb->transfer_buffer;
1186 char tty_flag = TTY_NORMAL;
1187 unsigned long flags;
1188 u8 line_status;
1189 int i;
1190
1191 /* update line status */
1192 spin_lock_irqsave(&priv->lock, flags);
1193 line_status = priv->line_status;
1194 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1195 spin_unlock_irqrestore(&priv->lock, flags);
1196
1197 if (!urb->actual_length)
1198 return;
1199
1200 /*
1201 * Break takes precedence over parity, which takes precedence over
1202 * framing errors.
1203 */
1204 if (line_status & UART_BREAK_ERROR)
1205 tty_flag = TTY_BREAK;
1206 else if (line_status & UART_PARITY_ERROR)
1207 tty_flag = TTY_PARITY;
1208 else if (line_status & UART_FRAME_ERROR)
1209 tty_flag = TTY_FRAME;
1210
1211 if (tty_flag != TTY_NORMAL)
1212 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1213 tty_flag);
1214 /* overrun is special, not associated with a char */
1215 if (line_status & UART_OVERRUN_ERROR)
1216 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1217
1218 if (port->sysrq) {
1219 for (i = 0; i < urb->actual_length; ++i)
1220 if (!usb_serial_handle_sysrq_char(port, data[i]))
1221 tty_insert_flip_char(&port->port, data[i],
1222 tty_flag);
1223 } else {
1224 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1225 urb->actual_length);
1226 }
1227
1228 tty_flip_buffer_push(&port->port);
1229 }
1230
1231 static struct usb_serial_driver pl2303_device = {
1232 .driver = {
1233 .owner = THIS_MODULE,
1234 .name = "pl2303",
1235 },
1236 .id_table = id_table,
1237 .num_bulk_in = 1,
1238 .num_bulk_out = 1,
1239 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
1240 .bulk_in_size = 256,
1241 .bulk_out_size = 256,
1242 .open = pl2303_open,
1243 .close = pl2303_close,
1244 .dtr_rts = pl2303_dtr_rts,
1245 .carrier_raised = pl2303_carrier_raised,
1246 .break_ctl = pl2303_break_ctl,
1247 .set_termios = pl2303_set_termios,
1248 .tiocmget = pl2303_tiocmget,
1249 .tiocmset = pl2303_tiocmset,
1250 .tiocmiwait = usb_serial_generic_tiocmiwait,
1251 .process_read_urb = pl2303_process_read_urb,
1252 .read_int_callback = pl2303_read_int_callback,
1253 .probe = pl2303_probe,
1254 .calc_num_ports = pl2303_calc_num_ports,
1255 .attach = pl2303_startup,
1256 .release = pl2303_release,
1257 .port_probe = pl2303_port_probe,
1258 .port_remove = pl2303_port_remove,
1259 };
1260
1261 static struct usb_serial_driver * const serial_drivers[] = {
1262 &pl2303_device, NULL
1263 };
1264
1265 module_usb_serial_driver(serial_drivers, id_table);
1266
1267 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1268 MODULE_LICENSE("GPL v2");
1269
