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