Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 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

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(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
 49         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
 50         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
 51         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
 52         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
 53         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
 54         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
 55         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
 56         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
 57         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
 58         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
 59         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
 60         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
 61         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
 62         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
 63         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
 64         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
 65                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 66         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
 67                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 68         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
 69                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
 70         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
 71         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
 72         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
 73         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
 74         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
 75         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
 76         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
 77         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
 78         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
 79         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
 80         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
 81         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
 82         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
 83         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
 84         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
 85         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
 86         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
 87         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 88         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 89         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 90         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 91         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 92         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 93         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 94         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 95         { }                                     /* Terminating entry */
 96 };
 97 
 98 MODULE_DEVICE_TABLE(usb, id_table);
 99 
100 #define SET_LINE_REQUEST_TYPE           0x21
101 #define SET_LINE_REQUEST                0x20
102 
103 #define SET_CONTROL_REQUEST_TYPE        0x21
104 #define SET_CONTROL_REQUEST             0x22
105 #define CONTROL_DTR                     0x01
106 #define CONTROL_RTS                     0x02
107 
108 #define BREAK_REQUEST_TYPE              0x21
109 #define BREAK_REQUEST                   0x23
110 #define BREAK_ON                        0xffff
111 #define BREAK_OFF                       0x0000
112 
113 #define GET_LINE_REQUEST_TYPE           0xa1
114 #define GET_LINE_REQUEST                0x21
115 
116 #define VENDOR_WRITE_REQUEST_TYPE       0x40
117 #define VENDOR_WRITE_REQUEST            0x01
118 
119 #define VENDOR_READ_REQUEST_TYPE        0xc0
120 #define VENDOR_READ_REQUEST             0x01
121 
122 #define UART_STATE_INDEX                8
123 #define UART_STATE_MSR_MASK             0x8b
124 #define UART_STATE_TRANSIENT_MASK       0x74
125 #define UART_DCD                        0x01
126 #define UART_DSR                        0x02
127 #define UART_BREAK_ERROR                0x04
128 #define UART_RING                       0x08
129 #define UART_FRAME_ERROR                0x10
130 #define UART_PARITY_ERROR               0x20
131 #define UART_OVERRUN_ERROR              0x40
132 #define UART_CTS                        0x80
133 
134 
135 enum pl2303_type {
136         TYPE_01,        /* Type 0 and 1 (difference unknown) */
137         TYPE_HX,        /* HX version of the pl2303 chip */
138         TYPE_COUNT
139 };
140 
141 struct pl2303_type_data {
142         speed_t max_baud_rate;
143         unsigned long quirks;
144 };
145 
146 struct pl2303_serial_private {
147         const struct pl2303_type_data *type;
148         unsigned long quirks;
149 };
150 
151 struct pl2303_private {
152         spinlock_t lock;
153         u8 line_control;
154         u8 line_status;
155 
156         u8 line_settings[7];
157 };
158 
159 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
160         [TYPE_01] = {
161                 .max_baud_rate =        1228800,
162                 .quirks =               PL2303_QUIRK_LEGACY,
163         },
164 };
165 
166 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
167                                                         unsigned char buf[1])
168 {
169         struct device *dev = &serial->interface->dev;
170         int res;
171 
172         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
173                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
174                         value, 0, buf, 1, 100);
175         if (res != 1) {
176                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
177                                                                 value, res);
178                 if (res >= 0)
179                         res = -EIO;
180 
181                 return res;
182         }
183 
184         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
185 
186         return 0;
187 }
188 
189 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
190 {
191         struct device *dev = &serial->interface->dev;
192         int res;
193 
194         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
195 
196         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
197                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
198                         value, index, NULL, 0, 100);
199         if (res) {
200                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
201                                                                 value, res);
202                 return res;
203         }
204 
205         return 0;
206 }
207 
208 static int pl2303_probe(struct usb_serial *serial,
209                                         const struct usb_device_id *id)
210 {
211         usb_set_serial_data(serial, (void *)id->driver_info);
212 
213         return 0;
214 }
215 
216 static int pl2303_startup(struct usb_serial *serial)
217 {
218         struct pl2303_serial_private *spriv;
219         enum pl2303_type type = TYPE_01;
220         unsigned char *buf;
221 
222         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
223         if (!spriv)
224                 return -ENOMEM;
225 
226         buf = kmalloc(1, GFP_KERNEL);
227         if (!buf) {
228                 kfree(spriv);
229                 return -ENOMEM;
230         }
231 
232         if (serial->dev->descriptor.bDeviceClass == 0x02)
233                 type = TYPE_01;         /* type 0 */
234         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
235                 type = TYPE_HX;
236         else if (serial->dev->descriptor.bDeviceClass == 0x00)
237                 type = TYPE_01;         /* type 1 */
238         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
239                 type = TYPE_01;         /* type 1 */
240         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
241 
242         spriv->type = &pl2303_type_data[type];
243         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
244         spriv->quirks |= spriv->type->quirks;
245 
246         usb_set_serial_data(serial, spriv);
247 
248         pl2303_vendor_read(serial, 0x8484, buf);
249         pl2303_vendor_write(serial, 0x0404, 0);
250         pl2303_vendor_read(serial, 0x8484, buf);
251         pl2303_vendor_read(serial, 0x8383, buf);
252         pl2303_vendor_read(serial, 0x8484, buf);
253         pl2303_vendor_write(serial, 0x0404, 1);
254         pl2303_vendor_read(serial, 0x8484, buf);
255         pl2303_vendor_read(serial, 0x8383, buf);
256         pl2303_vendor_write(serial, 0, 1);
257         pl2303_vendor_write(serial, 1, 0);
258         if (spriv->quirks & PL2303_QUIRK_LEGACY)
259                 pl2303_vendor_write(serial, 2, 0x24);
260         else
261                 pl2303_vendor_write(serial, 2, 0x44);
262 
263         kfree(buf);
264 
265         return 0;
266 }
267 
268 static void pl2303_release(struct usb_serial *serial)
269 {
270         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
271 
272         kfree(spriv);
273 }
274 
275 static int pl2303_port_probe(struct usb_serial_port *port)
276 {
277         struct pl2303_private *priv;
278 
279         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
280         if (!priv)
281                 return -ENOMEM;
282 
283         spin_lock_init(&priv->lock);
284 
285         usb_set_serial_port_data(port, priv);
286 
287         port->port.drain_delay = 256;
288 
289         return 0;
290 }
291 
292 static int pl2303_port_remove(struct usb_serial_port *port)
293 {
294         struct pl2303_private *priv = usb_get_serial_port_data(port);
295 
296         kfree(priv);
297 
298         return 0;
299 }
300 
301 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
302 {
303         struct usb_device *dev = port->serial->dev;
304         int retval;
305 
306         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
307 
308         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
309                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
310                                  value, 0, NULL, 0, 100);
311         if (retval)
312                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
313 
314         return retval;
315 }
316 
317 /*
318  * Returns the nearest supported baud rate that can be set directly without
319  * using divisors.
320  */
321 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
322 {
323         static const speed_t baud_sup[] = {
324                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
325                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
326                 614400, 921600, 1228800, 2457600, 3000000, 6000000
327         };
328 
329         unsigned i;
330 
331         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
332                 if (baud_sup[i] > baud)
333                         break;
334         }
335 
336         if (i == ARRAY_SIZE(baud_sup))
337                 baud = baud_sup[i - 1];
338         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
339                 baud = baud_sup[i - 1];
340         else
341                 baud = baud_sup[i];
342 
343         return baud;
344 }
345 
346 /*
347  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
348  *       use 9600 baud.
349  */
350 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
351                                                                 speed_t baud)
352 {
353         put_unaligned_le32(baud, buf);
354 
355         return baud;
356 }
357 
358 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
359                                                                 speed_t baud)
360 {
361         unsigned int tmp;
362 
363         /*
364          * Apparently the formula is:
365          * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
366          */
367         tmp = 12000000 * 32 / baud;
368         buf[3] = 0x80;
369         buf[2] = 0;
370         buf[1] = (tmp >= 256);
371         while (tmp >= 256) {
372                 tmp >>= 2;
373                 buf[1] <<= 1;
374         }
375         buf[0] = tmp;
376 
377         return baud;
378 }
379 
380 static void pl2303_encode_baud_rate(struct tty_struct *tty,
381                                         struct usb_serial_port *port,
382                                         u8 buf[4])
383 {
384         struct usb_serial *serial = port->serial;
385         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
386         speed_t baud_sup;
387         speed_t baud;
388 
389         baud = tty_get_baud_rate(tty);
390         dev_dbg(&port->dev, "baud requested = %u\n", baud);
391         if (!baud)
392                 return;
393 
394         if (spriv->type->max_baud_rate)
395                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
396         /*
397          * Set baud rate to nearest supported value.
398          *
399          * NOTE: Baud rate 500k can only be set using divisors.
400          */
401         baud_sup = pl2303_get_supported_baud_rate(baud);
402 
403         if (baud == 500000)
404                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
405         else
406                 baud = pl2303_encode_baud_rate_direct(buf, baud_sup);
407 
408         /* Save resulting baud rate */
409         tty_encode_baud_rate(tty, baud, baud);
410         dev_dbg(&port->dev, "baud set = %u\n", baud);
411 }
412 
413 static int pl2303_get_line_request(struct usb_serial_port *port,
414                                                         unsigned char buf[7])
415 {
416         struct usb_device *udev = port->serial->dev;
417         int ret;
418 
419         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
420                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
421                                 0, 0, buf, 7, 100);
422         if (ret != 7) {
423                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
424 
425                 if (ret > 0)
426                         ret = -EIO;
427 
428                 return ret;
429         }
430 
431         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
432 
433         return 0;
434 }
435 
436 static int pl2303_set_line_request(struct usb_serial_port *port,
437                                                         unsigned char buf[7])
438 {
439         struct usb_device *udev = port->serial->dev;
440         int ret;
441 
442         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
443                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
444                                 0, 0, buf, 7, 100);
445         if (ret != 7) {
446                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
447 
448                 if (ret > 0)
449                         ret = -EIO;
450 
451                 return ret;
452         }
453 
454         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
455 
456         return 0;
457 }
458 
459 static void pl2303_set_termios(struct tty_struct *tty,
460                 struct usb_serial_port *port, struct ktermios *old_termios)
461 {
462         struct usb_serial *serial = port->serial;
463         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
464         struct pl2303_private *priv = usb_get_serial_port_data(port);
465         unsigned long flags;
466         unsigned char *buf;
467         int ret;
468         u8 control;
469 
470         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
471                 return;
472 
473         buf = kzalloc(7, GFP_KERNEL);
474         if (!buf) {
475                 /* Report back no change occurred */
476                 if (old_termios)
477                         tty->termios = *old_termios;
478                 return;
479         }
480 
481         pl2303_get_line_request(port, buf);
482 
483         switch (C_CSIZE(tty)) {
484         case CS5:
485                 buf[6] = 5;
486                 break;
487         case CS6:
488                 buf[6] = 6;
489                 break;
490         case CS7:
491                 buf[6] = 7;
492                 break;
493         default:
494         case CS8:
495                 buf[6] = 8;
496         }
497         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
498 
499         /* For reference buf[0]:buf[3] baud rate value */
500         pl2303_encode_baud_rate(tty, port, &buf[0]);
501 
502         /* For reference buf[4]=0 is 1 stop bits */
503         /* For reference buf[4]=1 is 1.5 stop bits */
504         /* For reference buf[4]=2 is 2 stop bits */
505         if (C_CSTOPB(tty)) {
506                 /*
507                  * NOTE: Comply with "real" UARTs / RS232:
508                  *       use 1.5 instead of 2 stop bits with 5 data bits
509                  */
510                 if (C_CSIZE(tty) == CS5) {
511                         buf[4] = 1;
512                         dev_dbg(&port->dev, "stop bits = 1.5\n");
513                 } else {
514                         buf[4] = 2;
515                         dev_dbg(&port->dev, "stop bits = 2\n");
516                 }
517         } else {
518                 buf[4] = 0;
519                 dev_dbg(&port->dev, "stop bits = 1\n");
520         }
521 
522         if (C_PARENB(tty)) {
523                 /* For reference buf[5]=0 is none parity */
524                 /* For reference buf[5]=1 is odd parity */
525                 /* For reference buf[5]=2 is even parity */
526                 /* For reference buf[5]=3 is mark parity */
527                 /* For reference buf[5]=4 is space parity */
528                 if (C_PARODD(tty)) {
529                         if (C_CMSPAR(tty)) {
530                                 buf[5] = 3;
531                                 dev_dbg(&port->dev, "parity = mark\n");
532                         } else {
533                                 buf[5] = 1;
534                                 dev_dbg(&port->dev, "parity = odd\n");
535                         }
536                 } else {
537                         if (C_CMSPAR(tty)) {
538                                 buf[5] = 4;
539                                 dev_dbg(&port->dev, "parity = space\n");
540                         } else {
541                                 buf[5] = 2;
542                                 dev_dbg(&port->dev, "parity = even\n");
543                         }
544                 }
545         } else {
546                 buf[5] = 0;
547                 dev_dbg(&port->dev, "parity = none\n");
548         }
549 
550         /*
551          * Some PL2303 are known to lose bytes if you change serial settings
552          * even to the same values as before. Thus we actually need to filter
553          * in this specific case.
554          *
555          * Note that the tty_termios_hw_change check above is not sufficient
556          * as a previously requested baud rate may differ from the one
557          * actually used (and stored in old_termios).
558          *
559          * NOTE: No additional locking needed for line_settings as it is
560          *       only used in set_termios, which is serialised against itself.
561          */
562         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
563                 ret = pl2303_set_line_request(port, buf);
564                 if (!ret)
565                         memcpy(priv->line_settings, buf, 7);
566         }
567 
568         /* change control lines if we are switching to or from B0 */
569         spin_lock_irqsave(&priv->lock, flags);
570         control = priv->line_control;
571         if (C_BAUD(tty) == B0)
572                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
573         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
574                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
575         if (control != priv->line_control) {
576                 control = priv->line_control;
577                 spin_unlock_irqrestore(&priv->lock, flags);
578                 pl2303_set_control_lines(port, control);
579         } else {
580                 spin_unlock_irqrestore(&priv->lock, flags);
581         }
582 
583         if (C_CRTSCTS(tty)) {
584                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
585                         pl2303_vendor_write(serial, 0x0, 0x41);
586                 else
587                         pl2303_vendor_write(serial, 0x0, 0x61);
588         } else {
589                 pl2303_vendor_write(serial, 0x0, 0x0);
590         }
591 
592         kfree(buf);
593 }
594 
595 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
596 {
597         struct pl2303_private *priv = usb_get_serial_port_data(port);
598         unsigned long flags;
599         u8 control;
600 
601         spin_lock_irqsave(&priv->lock, flags);
602         if (on)
603                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
604         else
605                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
606         control = priv->line_control;
607         spin_unlock_irqrestore(&priv->lock, flags);
608 
609         pl2303_set_control_lines(port, control);
610 }
611 
612 static void pl2303_close(struct usb_serial_port *port)
613 {
614         usb_serial_generic_close(port);
615         usb_kill_urb(port->interrupt_in_urb);
616 }
617 
618 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
619 {
620         struct usb_serial *serial = port->serial;
621         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
622         int result;
623 
624         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
625                 usb_clear_halt(serial->dev, port->write_urb->pipe);
626                 usb_clear_halt(serial->dev, port->read_urb->pipe);
627         } else {
628                 /* reset upstream data pipes */
629                 pl2303_vendor_write(serial, 8, 0);
630                 pl2303_vendor_write(serial, 9, 0);
631         }
632 
633         /* Setup termios */
634         if (tty)
635                 pl2303_set_termios(tty, port, NULL);
636 
637         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
638         if (result) {
639                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
640                         result);
641                 return result;
642         }
643 
644         result = usb_serial_generic_open(tty, port);
645         if (result) {
646                 usb_kill_urb(port->interrupt_in_urb);
647                 return result;
648         }
649 
650         return 0;
651 }
652 
653 static int pl2303_tiocmset(struct tty_struct *tty,
654                            unsigned int set, unsigned int clear)
655 {
656         struct usb_serial_port *port = tty->driver_data;
657         struct pl2303_private *priv = usb_get_serial_port_data(port);
658         unsigned long flags;
659         u8 control;
660         int ret;
661 
662         spin_lock_irqsave(&priv->lock, flags);
663         if (set & TIOCM_RTS)
664                 priv->line_control |= CONTROL_RTS;
665         if (set & TIOCM_DTR)
666                 priv->line_control |= CONTROL_DTR;
667         if (clear & TIOCM_RTS)
668                 priv->line_control &= ~CONTROL_RTS;
669         if (clear & TIOCM_DTR)
670                 priv->line_control &= ~CONTROL_DTR;
671         control = priv->line_control;
672         spin_unlock_irqrestore(&priv->lock, flags);
673 
674         ret = pl2303_set_control_lines(port, control);
675         if (ret)
676                 return usb_translate_errors(ret);
677 
678         return 0;
679 }
680 
681 static int pl2303_tiocmget(struct tty_struct *tty)
682 {
683         struct usb_serial_port *port = tty->driver_data;
684         struct pl2303_private *priv = usb_get_serial_port_data(port);
685         unsigned long flags;
686         unsigned int mcr;
687         unsigned int status;
688         unsigned int result;
689 
690         spin_lock_irqsave(&priv->lock, flags);
691         mcr = priv->line_control;
692         status = priv->line_status;
693         spin_unlock_irqrestore(&priv->lock, flags);
694 
695         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
696                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
697                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
698                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
699                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
700                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
701 
702         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
703 
704         return result;
705 }
706 
707 static int pl2303_carrier_raised(struct usb_serial_port *port)
708 {
709         struct pl2303_private *priv = usb_get_serial_port_data(port);
710 
711         if (priv->line_status & UART_DCD)
712                 return 1;
713 
714         return 0;
715 }
716 
717 static int pl2303_ioctl(struct tty_struct *tty,
718                         unsigned int cmd, unsigned long arg)
719 {
720         struct serial_struct ser;
721         struct usb_serial_port *port = tty->driver_data;
722 
723         switch (cmd) {
724         case TIOCGSERIAL:
725                 memset(&ser, 0, sizeof ser);
726                 ser.type = PORT_16654;
727                 ser.line = port->minor;
728                 ser.port = port->port_number;
729                 ser.baud_base = 460800;
730 
731                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
732                         return -EFAULT;
733 
734                 return 0;
735         default:
736                 break;
737         }
738 
739         return -ENOIOCTLCMD;
740 }
741 
742 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
743 {
744         struct usb_serial_port *port = tty->driver_data;
745         struct usb_serial *serial = port->serial;
746         u16 state;
747         int result;
748 
749         if (break_state == 0)
750                 state = BREAK_OFF;
751         else
752                 state = BREAK_ON;
753 
754         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
755                         state == BREAK_OFF ? "off" : "on");
756 
757         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
758                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
759                                  0, NULL, 0, 100);
760         if (result)
761                 dev_err(&port->dev, "error sending break = %d\n", result);
762 }
763 
764 static void pl2303_update_line_status(struct usb_serial_port *port,
765                                       unsigned char *data,
766                                       unsigned int actual_length)
767 {
768         struct usb_serial *serial = port->serial;
769         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
770         struct pl2303_private *priv = usb_get_serial_port_data(port);
771         struct tty_struct *tty;
772         unsigned long flags;
773         unsigned int status_idx = UART_STATE_INDEX;
774         u8 status;
775         u8 delta;
776 
777         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
778                 status_idx = 0;
779 
780         if (actual_length < status_idx + 1)
781                 return;
782 
783         status = data[status_idx];
784 
785         /* Save off the uart status for others to look at */
786         spin_lock_irqsave(&priv->lock, flags);
787         delta = priv->line_status ^ status;
788         priv->line_status = status;
789         spin_unlock_irqrestore(&priv->lock, flags);
790 
791         if (status & UART_BREAK_ERROR)
792                 usb_serial_handle_break(port);
793 
794         if (delta & UART_STATE_MSR_MASK) {
795                 if (delta & UART_CTS)
796                         port->icount.cts++;
797                 if (delta & UART_DSR)
798                         port->icount.dsr++;
799                 if (delta & UART_RING)
800                         port->icount.rng++;
801                 if (delta & UART_DCD) {
802                         port->icount.dcd++;
803                         tty = tty_port_tty_get(&port->port);
804                         if (tty) {
805                                 usb_serial_handle_dcd_change(port, tty,
806                                                         status & UART_DCD);
807                                 tty_kref_put(tty);
808                         }
809                 }
810 
811                 wake_up_interruptible(&port->port.delta_msr_wait);
812         }
813 }
814 
815 static void pl2303_read_int_callback(struct urb *urb)
816 {
817         struct usb_serial_port *port =  urb->context;
818         unsigned char *data = urb->transfer_buffer;
819         unsigned int actual_length = urb->actual_length;
820         int status = urb->status;
821         int retval;
822 
823         switch (status) {
824         case 0:
825                 /* success */
826                 break;
827         case -ECONNRESET:
828         case -ENOENT:
829         case -ESHUTDOWN:
830                 /* this urb is terminated, clean up */
831                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
832                         __func__, status);
833                 return;
834         default:
835                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
836                         __func__, status);
837                 goto exit;
838         }
839 
840         usb_serial_debug_data(&port->dev, __func__,
841                               urb->actual_length, urb->transfer_buffer);
842 
843         pl2303_update_line_status(port, data, actual_length);
844 
845 exit:
846         retval = usb_submit_urb(urb, GFP_ATOMIC);
847         if (retval) {
848                 dev_err(&port->dev,
849                         "%s - usb_submit_urb failed with result %d\n",
850                         __func__, retval);
851         }
852 }
853 
854 static void pl2303_process_read_urb(struct urb *urb)
855 {
856         struct usb_serial_port *port = urb->context;
857         struct pl2303_private *priv = usb_get_serial_port_data(port);
858         unsigned char *data = urb->transfer_buffer;
859         char tty_flag = TTY_NORMAL;
860         unsigned long flags;
861         u8 line_status;
862         int i;
863 
864         /* update line status */
865         spin_lock_irqsave(&priv->lock, flags);
866         line_status = priv->line_status;
867         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
868         spin_unlock_irqrestore(&priv->lock, flags);
869 
870         if (!urb->actual_length)
871                 return;
872 
873         /*
874          * Break takes precedence over parity, which takes precedence over
875          * framing errors.
876          */
877         if (line_status & UART_BREAK_ERROR)
878                 tty_flag = TTY_BREAK;
879         else if (line_status & UART_PARITY_ERROR)
880                 tty_flag = TTY_PARITY;
881         else if (line_status & UART_FRAME_ERROR)
882                 tty_flag = TTY_FRAME;
883 
884         if (tty_flag != TTY_NORMAL)
885                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
886                                                                 tty_flag);
887         /* overrun is special, not associated with a char */
888         if (line_status & UART_OVERRUN_ERROR)
889                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
890 
891         if (port->port.console && port->sysrq) {
892                 for (i = 0; i < urb->actual_length; ++i)
893                         if (!usb_serial_handle_sysrq_char(port, data[i]))
894                                 tty_insert_flip_char(&port->port, data[i],
895                                                 tty_flag);
896         } else {
897                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
898                                                         urb->actual_length);
899         }
900 
901         tty_flip_buffer_push(&port->port);
902 }
903 
904 static struct usb_serial_driver pl2303_device = {
905         .driver = {
906                 .owner =        THIS_MODULE,
907                 .name =         "pl2303",
908         },
909         .id_table =             id_table,
910         .num_ports =            1,
911         .bulk_in_size =         256,
912         .bulk_out_size =        256,
913         .open =                 pl2303_open,
914         .close =                pl2303_close,
915         .dtr_rts =              pl2303_dtr_rts,
916         .carrier_raised =       pl2303_carrier_raised,
917         .ioctl =                pl2303_ioctl,
918         .break_ctl =            pl2303_break_ctl,
919         .set_termios =          pl2303_set_termios,
920         .tiocmget =             pl2303_tiocmget,
921         .tiocmset =             pl2303_tiocmset,
922         .tiocmiwait =           usb_serial_generic_tiocmiwait,
923         .process_read_urb =     pl2303_process_read_urb,
924         .read_int_callback =    pl2303_read_int_callback,
925         .probe =                pl2303_probe,
926         .attach =               pl2303_startup,
927         .release =              pl2303_release,
928         .port_probe =           pl2303_port_probe,
929         .port_remove =          pl2303_port_remove,
930 };
931 
932 static struct usb_serial_driver * const serial_drivers[] = {
933         &pl2303_device, NULL
934 };
935 
936 module_usb_serial_driver(serial_drivers, id_table);
937 
938 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
939 MODULE_LICENSE("GPL");
940 

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