Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/usb/serial/pl2303.c

  1 /*
  2  * Prolific PL2303 USB to serial adaptor driver
  3  *
  4  * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
  5  * Copyright (C) 2003 IBM Corp.
  6  *
  7  * Original driver for 2.2.x by anonymous
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License version
 11  *      2 as published by the Free Software Foundation.
 12  *
 13  * See Documentation/usb/usb-serial.txt for more information on using this
 14  * driver
 15  */
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/errno.h>
 19 #include <linux/slab.h>
 20 #include <linux/tty.h>
 21 #include <linux/tty_driver.h>
 22 #include <linux/tty_flip.h>
 23 #include <linux/serial.h>
 24 #include <linux/module.h>
 25 #include <linux/moduleparam.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/uaccess.h>
 28 #include <linux/usb.h>
 29 #include <linux/usb/serial.h>
 30 #include <asm/unaligned.h>
 31 #include "pl2303.h"
 32 
 33 
 34 #define PL2303_QUIRK_UART_STATE_IDX0            BIT(0)
 35 #define PL2303_QUIRK_LEGACY                     BIT(1)
 36 
 37 static const struct usb_device_id id_table[] = {
 38         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
 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_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(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
 50         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
 51         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
 52         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
 53         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
 54         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
 55         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
 56         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
 57         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
 58         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
 59         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
 60         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
 61         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
 62         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
 63         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
 64         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
 65         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
 66                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 67         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
 68                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 69         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
 70                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 71         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
 72         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
 73         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
 74         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
 75         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
 76         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
 77         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
 78         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
 79         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
 80         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
 81         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
 82         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
 83         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
 84         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
 85         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
 86         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
 87         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
 88         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 89         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 90         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 91         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 92         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 93         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 94         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 95         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 96         { }                                     /* Terminating entry */
 97 };
 98 
 99 MODULE_DEVICE_TABLE(usb, id_table);
100 
101 #define SET_LINE_REQUEST_TYPE           0x21
102 #define SET_LINE_REQUEST                0x20
103 
104 #define SET_CONTROL_REQUEST_TYPE        0x21
105 #define SET_CONTROL_REQUEST             0x22
106 #define CONTROL_DTR                     0x01
107 #define CONTROL_RTS                     0x02
108 
109 #define BREAK_REQUEST_TYPE              0x21
110 #define BREAK_REQUEST                   0x23
111 #define BREAK_ON                        0xffff
112 #define BREAK_OFF                       0x0000
113 
114 #define GET_LINE_REQUEST_TYPE           0xa1
115 #define GET_LINE_REQUEST                0x21
116 
117 #define VENDOR_WRITE_REQUEST_TYPE       0x40
118 #define VENDOR_WRITE_REQUEST            0x01
119 
120 #define VENDOR_READ_REQUEST_TYPE        0xc0
121 #define VENDOR_READ_REQUEST             0x01
122 
123 #define UART_STATE_INDEX                8
124 #define UART_STATE_MSR_MASK             0x8b
125 #define UART_STATE_TRANSIENT_MASK       0x74
126 #define UART_DCD                        0x01
127 #define UART_DSR                        0x02
128 #define UART_BREAK_ERROR                0x04
129 #define UART_RING                       0x08
130 #define UART_FRAME_ERROR                0x10
131 #define UART_PARITY_ERROR               0x20
132 #define UART_OVERRUN_ERROR              0x40
133 #define UART_CTS                        0x80
134 
135 
136 enum pl2303_type {
137         TYPE_01,        /* Type 0 and 1 (difference unknown) */
138         TYPE_HX,        /* HX version of the pl2303 chip */
139         TYPE_COUNT
140 };
141 
142 struct pl2303_type_data {
143         speed_t max_baud_rate;
144         unsigned long quirks;
145 };
146 
147 struct pl2303_serial_private {
148         const struct pl2303_type_data *type;
149         unsigned long quirks;
150 };
151 
152 struct pl2303_private {
153         spinlock_t lock;
154         u8 line_control;
155         u8 line_status;
156 
157         u8 line_settings[7];
158 };
159 
160 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
161         [TYPE_01] = {
162                 .max_baud_rate =        1228800,
163                 .quirks =               PL2303_QUIRK_LEGACY,
164         },
165         [TYPE_HX] = {
166                 .max_baud_rate =        12000000,
167         },
168 };
169 
170 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
171                                                         unsigned char buf[1])
172 {
173         struct device *dev = &serial->interface->dev;
174         int res;
175 
176         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
177                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
178                         value, 0, buf, 1, 100);
179         if (res != 1) {
180                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
181                                                                 value, res);
182                 if (res >= 0)
183                         res = -EIO;
184 
185                 return res;
186         }
187 
188         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
189 
190         return 0;
191 }
192 
193 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
194 {
195         struct device *dev = &serial->interface->dev;
196         int res;
197 
198         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
199 
200         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
201                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
202                         value, index, NULL, 0, 100);
203         if (res) {
204                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
205                                                                 value, res);
206                 return res;
207         }
208 
209         return 0;
210 }
211 
212 static int pl2303_probe(struct usb_serial *serial,
213                                         const struct usb_device_id *id)
214 {
215         usb_set_serial_data(serial, (void *)id->driver_info);
216 
217         return 0;
218 }
219 
220 static int pl2303_startup(struct usb_serial *serial)
221 {
222         struct pl2303_serial_private *spriv;
223         enum pl2303_type type = TYPE_01;
224         unsigned char *buf;
225 
226         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
227         if (!spriv)
228                 return -ENOMEM;
229 
230         buf = kmalloc(1, GFP_KERNEL);
231         if (!buf) {
232                 kfree(spriv);
233                 return -ENOMEM;
234         }
235 
236         if (serial->dev->descriptor.bDeviceClass == 0x02)
237                 type = TYPE_01;         /* type 0 */
238         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
239                 type = TYPE_HX;
240         else if (serial->dev->descriptor.bDeviceClass == 0x00)
241                 type = TYPE_01;         /* type 1 */
242         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
243                 type = TYPE_01;         /* type 1 */
244         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
245 
246         spriv->type = &pl2303_type_data[type];
247         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
248         spriv->quirks |= spriv->type->quirks;
249 
250         usb_set_serial_data(serial, spriv);
251 
252         pl2303_vendor_read(serial, 0x8484, buf);
253         pl2303_vendor_write(serial, 0x0404, 0);
254         pl2303_vendor_read(serial, 0x8484, buf);
255         pl2303_vendor_read(serial, 0x8383, buf);
256         pl2303_vendor_read(serial, 0x8484, buf);
257         pl2303_vendor_write(serial, 0x0404, 1);
258         pl2303_vendor_read(serial, 0x8484, buf);
259         pl2303_vendor_read(serial, 0x8383, buf);
260         pl2303_vendor_write(serial, 0, 1);
261         pl2303_vendor_write(serial, 1, 0);
262         if (spriv->quirks & PL2303_QUIRK_LEGACY)
263                 pl2303_vendor_write(serial, 2, 0x24);
264         else
265                 pl2303_vendor_write(serial, 2, 0x44);
266 
267         kfree(buf);
268 
269         return 0;
270 }
271 
272 static void pl2303_release(struct usb_serial *serial)
273 {
274         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
275 
276         kfree(spriv);
277 }
278 
279 static int pl2303_port_probe(struct usb_serial_port *port)
280 {
281         struct pl2303_private *priv;
282 
283         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
284         if (!priv)
285                 return -ENOMEM;
286 
287         spin_lock_init(&priv->lock);
288 
289         usb_set_serial_port_data(port, priv);
290 
291         port->port.drain_delay = 256;
292 
293         return 0;
294 }
295 
296 static int pl2303_port_remove(struct usb_serial_port *port)
297 {
298         struct pl2303_private *priv = usb_get_serial_port_data(port);
299 
300         kfree(priv);
301 
302         return 0;
303 }
304 
305 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
306 {
307         struct usb_device *dev = port->serial->dev;
308         int retval;
309 
310         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
311 
312         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
313                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
314                                  value, 0, NULL, 0, 100);
315         if (retval)
316                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
317 
318         return retval;
319 }
320 
321 /*
322  * Returns the nearest supported baud rate that can be set directly without
323  * using divisors.
324  */
325 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
326 {
327         static const speed_t baud_sup[] = {
328                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
329                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
330                 614400, 921600, 1228800, 2457600, 3000000, 6000000
331         };
332 
333         unsigned i;
334 
335         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
336                 if (baud_sup[i] > baud)
337                         break;
338         }
339 
340         if (i == ARRAY_SIZE(baud_sup))
341                 baud = baud_sup[i - 1];
342         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
343                 baud = baud_sup[i - 1];
344         else
345                 baud = baud_sup[i];
346 
347         return baud;
348 }
349 
350 /*
351  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
352  *       use 9600 baud.
353  */
354 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
355                                                                 speed_t baud)
356 {
357         put_unaligned_le32(baud, buf);
358 
359         return baud;
360 }
361 
362 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
363                                                                 speed_t baud)
364 {
365         unsigned int tmp;
366 
367         /*
368          * Apparently the formula is:
369          * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
370          */
371         tmp = 12000000 * 32 / baud;
372         buf[3] = 0x80;
373         buf[2] = 0;
374         buf[1] = (tmp >= 256);
375         while (tmp >= 256) {
376                 tmp >>= 2;
377                 buf[1] <<= 1;
378         }
379         buf[0] = tmp;
380 
381         return baud;
382 }
383 
384 static void pl2303_encode_baud_rate(struct tty_struct *tty,
385                                         struct usb_serial_port *port,
386                                         u8 buf[4])
387 {
388         struct usb_serial *serial = port->serial;
389         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
390         speed_t baud_sup;
391         speed_t baud;
392 
393         baud = tty_get_baud_rate(tty);
394         dev_dbg(&port->dev, "baud requested = %u\n", baud);
395         if (!baud)
396                 return;
397 
398         if (spriv->type->max_baud_rate)
399                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
400         /*
401          * Use direct method for supported baud rates, otherwise use divisors.
402          */
403         baud_sup = pl2303_get_supported_baud_rate(baud);
404 
405         if (baud == baud_sup)
406                 baud = pl2303_encode_baud_rate_direct(buf, baud);
407         else
408                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
409 
410         /* Save resulting baud rate */
411         tty_encode_baud_rate(tty, baud, baud);
412         dev_dbg(&port->dev, "baud set = %u\n", baud);
413 }
414 
415 static int pl2303_get_line_request(struct usb_serial_port *port,
416                                                         unsigned char buf[7])
417 {
418         struct usb_device *udev = port->serial->dev;
419         int ret;
420 
421         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
422                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
423                                 0, 0, buf, 7, 100);
424         if (ret != 7) {
425                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
426 
427                 if (ret > 0)
428                         ret = -EIO;
429 
430                 return ret;
431         }
432 
433         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
434 
435         return 0;
436 }
437 
438 static int pl2303_set_line_request(struct usb_serial_port *port,
439                                                         unsigned char buf[7])
440 {
441         struct usb_device *udev = port->serial->dev;
442         int ret;
443 
444         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
445                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
446                                 0, 0, buf, 7, 100);
447         if (ret != 7) {
448                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
449 
450                 if (ret > 0)
451                         ret = -EIO;
452 
453                 return ret;
454         }
455 
456         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
457 
458         return 0;
459 }
460 
461 static void pl2303_set_termios(struct tty_struct *tty,
462                 struct usb_serial_port *port, struct ktermios *old_termios)
463 {
464         struct usb_serial *serial = port->serial;
465         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
466         struct pl2303_private *priv = usb_get_serial_port_data(port);
467         unsigned long flags;
468         unsigned char *buf;
469         int ret;
470         u8 control;
471 
472         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
473                 return;
474 
475         buf = kzalloc(7, GFP_KERNEL);
476         if (!buf) {
477                 /* Report back no change occurred */
478                 if (old_termios)
479                         tty->termios = *old_termios;
480                 return;
481         }
482 
483         pl2303_get_line_request(port, buf);
484 
485         switch (C_CSIZE(tty)) {
486         case CS5:
487                 buf[6] = 5;
488                 break;
489         case CS6:
490                 buf[6] = 6;
491                 break;
492         case CS7:
493                 buf[6] = 7;
494                 break;
495         default:
496         case CS8:
497                 buf[6] = 8;
498         }
499         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
500 
501         /* For reference buf[0]:buf[3] baud rate value */
502         pl2303_encode_baud_rate(tty, port, &buf[0]);
503 
504         /* For reference buf[4]=0 is 1 stop bits */
505         /* For reference buf[4]=1 is 1.5 stop bits */
506         /* For reference buf[4]=2 is 2 stop bits */
507         if (C_CSTOPB(tty)) {
508                 /*
509                  * NOTE: Comply with "real" UARTs / RS232:
510                  *       use 1.5 instead of 2 stop bits with 5 data bits
511                  */
512                 if (C_CSIZE(tty) == CS5) {
513                         buf[4] = 1;
514                         dev_dbg(&port->dev, "stop bits = 1.5\n");
515                 } else {
516                         buf[4] = 2;
517                         dev_dbg(&port->dev, "stop bits = 2\n");
518                 }
519         } else {
520                 buf[4] = 0;
521                 dev_dbg(&port->dev, "stop bits = 1\n");
522         }
523 
524         if (C_PARENB(tty)) {
525                 /* For reference buf[5]=0 is none parity */
526                 /* For reference buf[5]=1 is odd parity */
527                 /* For reference buf[5]=2 is even parity */
528                 /* For reference buf[5]=3 is mark parity */
529                 /* For reference buf[5]=4 is space parity */
530                 if (C_PARODD(tty)) {
531                         if (C_CMSPAR(tty)) {
532                                 buf[5] = 3;
533                                 dev_dbg(&port->dev, "parity = mark\n");
534                         } else {
535                                 buf[5] = 1;
536                                 dev_dbg(&port->dev, "parity = odd\n");
537                         }
538                 } else {
539                         if (C_CMSPAR(tty)) {
540                                 buf[5] = 4;
541                                 dev_dbg(&port->dev, "parity = space\n");
542                         } else {
543                                 buf[5] = 2;
544                                 dev_dbg(&port->dev, "parity = even\n");
545                         }
546                 }
547         } else {
548                 buf[5] = 0;
549                 dev_dbg(&port->dev, "parity = none\n");
550         }
551 
552         /*
553          * Some PL2303 are known to lose bytes if you change serial settings
554          * even to the same values as before. Thus we actually need to filter
555          * in this specific case.
556          *
557          * Note that the tty_termios_hw_change check above is not sufficient
558          * as a previously requested baud rate may differ from the one
559          * actually used (and stored in old_termios).
560          *
561          * NOTE: No additional locking needed for line_settings as it is
562          *       only used in set_termios, which is serialised against itself.
563          */
564         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
565                 ret = pl2303_set_line_request(port, buf);
566                 if (!ret)
567                         memcpy(priv->line_settings, buf, 7);
568         }
569 
570         /* change control lines if we are switching to or from B0 */
571         spin_lock_irqsave(&priv->lock, flags);
572         control = priv->line_control;
573         if (C_BAUD(tty) == B0)
574                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
575         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
576                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
577         if (control != priv->line_control) {
578                 control = priv->line_control;
579                 spin_unlock_irqrestore(&priv->lock, flags);
580                 pl2303_set_control_lines(port, control);
581         } else {
582                 spin_unlock_irqrestore(&priv->lock, flags);
583         }
584 
585         if (C_CRTSCTS(tty)) {
586                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
587                         pl2303_vendor_write(serial, 0x0, 0x41);
588                 else
589                         pl2303_vendor_write(serial, 0x0, 0x61);
590         } else {
591                 pl2303_vendor_write(serial, 0x0, 0x0);
592         }
593 
594         kfree(buf);
595 }
596 
597 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
598 {
599         struct pl2303_private *priv = usb_get_serial_port_data(port);
600         unsigned long flags;
601         u8 control;
602 
603         spin_lock_irqsave(&priv->lock, flags);
604         if (on)
605                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
606         else
607                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
608         control = priv->line_control;
609         spin_unlock_irqrestore(&priv->lock, flags);
610 
611         pl2303_set_control_lines(port, control);
612 }
613 
614 static void pl2303_close(struct usb_serial_port *port)
615 {
616         usb_serial_generic_close(port);
617         usb_kill_urb(port->interrupt_in_urb);
618 }
619 
620 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
621 {
622         struct usb_serial *serial = port->serial;
623         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
624         int result;
625 
626         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
627                 usb_clear_halt(serial->dev, port->write_urb->pipe);
628                 usb_clear_halt(serial->dev, port->read_urb->pipe);
629         } else {
630                 /* reset upstream data pipes */
631                 pl2303_vendor_write(serial, 8, 0);
632                 pl2303_vendor_write(serial, 9, 0);
633         }
634 
635         /* Setup termios */
636         if (tty)
637                 pl2303_set_termios(tty, port, NULL);
638 
639         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
640         if (result) {
641                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
642                         result);
643                 return result;
644         }
645 
646         result = usb_serial_generic_open(tty, port);
647         if (result) {
648                 usb_kill_urb(port->interrupt_in_urb);
649                 return result;
650         }
651 
652         return 0;
653 }
654 
655 static int pl2303_tiocmset(struct tty_struct *tty,
656                            unsigned int set, unsigned int clear)
657 {
658         struct usb_serial_port *port = tty->driver_data;
659         struct pl2303_private *priv = usb_get_serial_port_data(port);
660         unsigned long flags;
661         u8 control;
662         int ret;
663 
664         spin_lock_irqsave(&priv->lock, flags);
665         if (set & TIOCM_RTS)
666                 priv->line_control |= CONTROL_RTS;
667         if (set & TIOCM_DTR)
668                 priv->line_control |= CONTROL_DTR;
669         if (clear & TIOCM_RTS)
670                 priv->line_control &= ~CONTROL_RTS;
671         if (clear & TIOCM_DTR)
672                 priv->line_control &= ~CONTROL_DTR;
673         control = priv->line_control;
674         spin_unlock_irqrestore(&priv->lock, flags);
675 
676         ret = pl2303_set_control_lines(port, control);
677         if (ret)
678                 return usb_translate_errors(ret);
679 
680         return 0;
681 }
682 
683 static int pl2303_tiocmget(struct tty_struct *tty)
684 {
685         struct usb_serial_port *port = tty->driver_data;
686         struct pl2303_private *priv = usb_get_serial_port_data(port);
687         unsigned long flags;
688         unsigned int mcr;
689         unsigned int status;
690         unsigned int result;
691 
692         spin_lock_irqsave(&priv->lock, flags);
693         mcr = priv->line_control;
694         status = priv->line_status;
695         spin_unlock_irqrestore(&priv->lock, flags);
696 
697         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
698                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
699                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
700                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
701                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
702                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
703 
704         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
705 
706         return result;
707 }
708 
709 static int pl2303_carrier_raised(struct usb_serial_port *port)
710 {
711         struct pl2303_private *priv = usb_get_serial_port_data(port);
712 
713         if (priv->line_status & UART_DCD)
714                 return 1;
715 
716         return 0;
717 }
718 
719 static int pl2303_ioctl(struct tty_struct *tty,
720                         unsigned int cmd, unsigned long arg)
721 {
722         struct serial_struct ser;
723         struct usb_serial_port *port = tty->driver_data;
724 
725         switch (cmd) {
726         case TIOCGSERIAL:
727                 memset(&ser, 0, sizeof ser);
728                 ser.type = PORT_16654;
729                 ser.line = port->minor;
730                 ser.port = port->port_number;
731                 ser.baud_base = 460800;
732 
733                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
734                         return -EFAULT;
735 
736                 return 0;
737         default:
738                 break;
739         }
740 
741         return -ENOIOCTLCMD;
742 }
743 
744 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
745 {
746         struct usb_serial_port *port = tty->driver_data;
747         struct usb_serial *serial = port->serial;
748         u16 state;
749         int result;
750 
751         if (break_state == 0)
752                 state = BREAK_OFF;
753         else
754                 state = BREAK_ON;
755 
756         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
757                         state == BREAK_OFF ? "off" : "on");
758 
759         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
760                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
761                                  0, NULL, 0, 100);
762         if (result)
763                 dev_err(&port->dev, "error sending break = %d\n", result);
764 }
765 
766 static void pl2303_update_line_status(struct usb_serial_port *port,
767                                       unsigned char *data,
768                                       unsigned int actual_length)
769 {
770         struct usb_serial *serial = port->serial;
771         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
772         struct pl2303_private *priv = usb_get_serial_port_data(port);
773         struct tty_struct *tty;
774         unsigned long flags;
775         unsigned int status_idx = UART_STATE_INDEX;
776         u8 status;
777         u8 delta;
778 
779         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
780                 status_idx = 0;
781 
782         if (actual_length < status_idx + 1)
783                 return;
784 
785         status = data[status_idx];
786 
787         /* Save off the uart status for others to look at */
788         spin_lock_irqsave(&priv->lock, flags);
789         delta = priv->line_status ^ status;
790         priv->line_status = status;
791         spin_unlock_irqrestore(&priv->lock, flags);
792 
793         if (status & UART_BREAK_ERROR)
794                 usb_serial_handle_break(port);
795 
796         if (delta & UART_STATE_MSR_MASK) {
797                 if (delta & UART_CTS)
798                         port->icount.cts++;
799                 if (delta & UART_DSR)
800                         port->icount.dsr++;
801                 if (delta & UART_RING)
802                         port->icount.rng++;
803                 if (delta & UART_DCD) {
804                         port->icount.dcd++;
805                         tty = tty_port_tty_get(&port->port);
806                         if (tty) {
807                                 usb_serial_handle_dcd_change(port, tty,
808                                                         status & UART_DCD);
809                                 tty_kref_put(tty);
810                         }
811                 }
812 
813                 wake_up_interruptible(&port->port.delta_msr_wait);
814         }
815 }
816 
817 static void pl2303_read_int_callback(struct urb *urb)
818 {
819         struct usb_serial_port *port =  urb->context;
820         unsigned char *data = urb->transfer_buffer;
821         unsigned int actual_length = urb->actual_length;
822         int status = urb->status;
823         int retval;
824 
825         switch (status) {
826         case 0:
827                 /* success */
828                 break;
829         case -ECONNRESET:
830         case -ENOENT:
831         case -ESHUTDOWN:
832                 /* this urb is terminated, clean up */
833                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
834                         __func__, status);
835                 return;
836         default:
837                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
838                         __func__, status);
839                 goto exit;
840         }
841 
842         usb_serial_debug_data(&port->dev, __func__,
843                               urb->actual_length, urb->transfer_buffer);
844 
845         pl2303_update_line_status(port, data, actual_length);
846 
847 exit:
848         retval = usb_submit_urb(urb, GFP_ATOMIC);
849         if (retval) {
850                 dev_err(&port->dev,
851                         "%s - usb_submit_urb failed with result %d\n",
852                         __func__, retval);
853         }
854 }
855 
856 static void pl2303_process_read_urb(struct urb *urb)
857 {
858         struct usb_serial_port *port = urb->context;
859         struct pl2303_private *priv = usb_get_serial_port_data(port);
860         unsigned char *data = urb->transfer_buffer;
861         char tty_flag = TTY_NORMAL;
862         unsigned long flags;
863         u8 line_status;
864         int i;
865 
866         /* update line status */
867         spin_lock_irqsave(&priv->lock, flags);
868         line_status = priv->line_status;
869         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
870         spin_unlock_irqrestore(&priv->lock, flags);
871 
872         if (!urb->actual_length)
873                 return;
874 
875         /*
876          * Break takes precedence over parity, which takes precedence over
877          * framing errors.
878          */
879         if (line_status & UART_BREAK_ERROR)
880                 tty_flag = TTY_BREAK;
881         else if (line_status & UART_PARITY_ERROR)
882                 tty_flag = TTY_PARITY;
883         else if (line_status & UART_FRAME_ERROR)
884                 tty_flag = TTY_FRAME;
885 
886         if (tty_flag != TTY_NORMAL)
887                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
888                                                                 tty_flag);
889         /* overrun is special, not associated with a char */
890         if (line_status & UART_OVERRUN_ERROR)
891                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
892 
893         if (port->port.console && port->sysrq) {
894                 for (i = 0; i < urb->actual_length; ++i)
895                         if (!usb_serial_handle_sysrq_char(port, data[i]))
896                                 tty_insert_flip_char(&port->port, data[i],
897                                                 tty_flag);
898         } else {
899                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
900                                                         urb->actual_length);
901         }
902 
903         tty_flip_buffer_push(&port->port);
904 }
905 
906 static struct usb_serial_driver pl2303_device = {
907         .driver = {
908                 .owner =        THIS_MODULE,
909                 .name =         "pl2303",
910         },
911         .id_table =             id_table,
912         .num_ports =            1,
913         .bulk_in_size =         256,
914         .bulk_out_size =        256,
915         .open =                 pl2303_open,
916         .close =                pl2303_close,
917         .dtr_rts =              pl2303_dtr_rts,
918         .carrier_raised =       pl2303_carrier_raised,
919         .ioctl =                pl2303_ioctl,
920         .break_ctl =            pl2303_break_ctl,
921         .set_termios =          pl2303_set_termios,
922         .tiocmget =             pl2303_tiocmget,
923         .tiocmset =             pl2303_tiocmset,
924         .tiocmiwait =           usb_serial_generic_tiocmiwait,
925         .process_read_urb =     pl2303_process_read_urb,
926         .read_int_callback =    pl2303_read_int_callback,
927         .probe =                pl2303_probe,
928         .attach =               pl2303_startup,
929         .release =              pl2303_release,
930         .port_probe =           pl2303_port_probe,
931         .port_remove =          pl2303_port_remove,
932 };
933 
934 static struct usb_serial_driver * const serial_drivers[] = {
935         &pl2303_device, NULL
936 };
937 
938 module_usb_serial_driver(serial_drivers, id_table);
939 
940 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
941 MODULE_LICENSE("GPL");
942 

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