Version:  2.0.40 2.2.26 2.4.37 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 3.17

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 };
166 
167 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
168                                                         unsigned char buf[1])
169 {
170         struct device *dev = &serial->interface->dev;
171         int res;
172 
173         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
174                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
175                         value, 0, buf, 1, 100);
176         if (res != 1) {
177                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
178                                                                 value, res);
179                 if (res >= 0)
180                         res = -EIO;
181 
182                 return res;
183         }
184 
185         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
186 
187         return 0;
188 }
189 
190 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
191 {
192         struct device *dev = &serial->interface->dev;
193         int res;
194 
195         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
196 
197         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
198                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
199                         value, index, NULL, 0, 100);
200         if (res) {
201                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
202                                                                 value, res);
203                 return res;
204         }
205 
206         return 0;
207 }
208 
209 static int pl2303_probe(struct usb_serial *serial,
210                                         const struct usb_device_id *id)
211 {
212         usb_set_serial_data(serial, (void *)id->driver_info);
213 
214         return 0;
215 }
216 
217 static int pl2303_startup(struct usb_serial *serial)
218 {
219         struct pl2303_serial_private *spriv;
220         enum pl2303_type type = TYPE_01;
221         unsigned char *buf;
222 
223         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
224         if (!spriv)
225                 return -ENOMEM;
226 
227         buf = kmalloc(1, GFP_KERNEL);
228         if (!buf) {
229                 kfree(spriv);
230                 return -ENOMEM;
231         }
232 
233         if (serial->dev->descriptor.bDeviceClass == 0x02)
234                 type = TYPE_01;         /* type 0 */
235         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
236                 type = TYPE_HX;
237         else if (serial->dev->descriptor.bDeviceClass == 0x00)
238                 type = TYPE_01;         /* type 1 */
239         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
240                 type = TYPE_01;         /* type 1 */
241         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
242 
243         spriv->type = &pl2303_type_data[type];
244         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
245         spriv->quirks |= spriv->type->quirks;
246 
247         usb_set_serial_data(serial, spriv);
248 
249         pl2303_vendor_read(serial, 0x8484, buf);
250         pl2303_vendor_write(serial, 0x0404, 0);
251         pl2303_vendor_read(serial, 0x8484, buf);
252         pl2303_vendor_read(serial, 0x8383, buf);
253         pl2303_vendor_read(serial, 0x8484, buf);
254         pl2303_vendor_write(serial, 0x0404, 1);
255         pl2303_vendor_read(serial, 0x8484, buf);
256         pl2303_vendor_read(serial, 0x8383, buf);
257         pl2303_vendor_write(serial, 0, 1);
258         pl2303_vendor_write(serial, 1, 0);
259         if (spriv->quirks & PL2303_QUIRK_LEGACY)
260                 pl2303_vendor_write(serial, 2, 0x24);
261         else
262                 pl2303_vendor_write(serial, 2, 0x44);
263 
264         kfree(buf);
265 
266         return 0;
267 }
268 
269 static void pl2303_release(struct usb_serial *serial)
270 {
271         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
272 
273         kfree(spriv);
274 }
275 
276 static int pl2303_port_probe(struct usb_serial_port *port)
277 {
278         struct pl2303_private *priv;
279 
280         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
281         if (!priv)
282                 return -ENOMEM;
283 
284         spin_lock_init(&priv->lock);
285 
286         usb_set_serial_port_data(port, priv);
287 
288         port->port.drain_delay = 256;
289 
290         return 0;
291 }
292 
293 static int pl2303_port_remove(struct usb_serial_port *port)
294 {
295         struct pl2303_private *priv = usb_get_serial_port_data(port);
296 
297         kfree(priv);
298 
299         return 0;
300 }
301 
302 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
303 {
304         struct usb_device *dev = port->serial->dev;
305         int retval;
306 
307         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
308 
309         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
310                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
311                                  value, 0, NULL, 0, 100);
312         if (retval)
313                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
314 
315         return retval;
316 }
317 
318 /*
319  * Returns the nearest supported baud rate that can be set directly without
320  * using divisors.
321  */
322 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
323 {
324         static const speed_t baud_sup[] = {
325                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
326                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
327                 614400, 921600, 1228800, 2457600, 3000000, 6000000
328         };
329 
330         unsigned i;
331 
332         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
333                 if (baud_sup[i] > baud)
334                         break;
335         }
336 
337         if (i == ARRAY_SIZE(baud_sup))
338                 baud = baud_sup[i - 1];
339         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
340                 baud = baud_sup[i - 1];
341         else
342                 baud = baud_sup[i];
343 
344         return baud;
345 }
346 
347 /*
348  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
349  *       use 9600 baud.
350  */
351 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
352                                                                 speed_t baud)
353 {
354         put_unaligned_le32(baud, buf);
355 
356         return baud;
357 }
358 
359 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
360                                                                 speed_t baud)
361 {
362         unsigned int tmp;
363 
364         /*
365          * Apparently the formula is:
366          * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
367          */
368         tmp = 12000000 * 32 / baud;
369         buf[3] = 0x80;
370         buf[2] = 0;
371         buf[1] = (tmp >= 256);
372         while (tmp >= 256) {
373                 tmp >>= 2;
374                 buf[1] <<= 1;
375         }
376         buf[0] = tmp;
377 
378         return baud;
379 }
380 
381 static void pl2303_encode_baud_rate(struct tty_struct *tty,
382                                         struct usb_serial_port *port,
383                                         u8 buf[4])
384 {
385         struct usb_serial *serial = port->serial;
386         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
387         speed_t baud_sup;
388         speed_t baud;
389 
390         baud = tty_get_baud_rate(tty);
391         dev_dbg(&port->dev, "baud requested = %u\n", baud);
392         if (!baud)
393                 return;
394 
395         if (spriv->type->max_baud_rate)
396                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
397         /*
398          * Set baud rate to nearest supported value.
399          *
400          * NOTE: Baud rate 500k can only be set using divisors.
401          */
402         baud_sup = pl2303_get_supported_baud_rate(baud);
403 
404         if (baud == 500000)
405                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
406         else
407                 baud = pl2303_encode_baud_rate_direct(buf, baud_sup);
408 
409         /* Save resulting baud rate */
410         tty_encode_baud_rate(tty, baud, baud);
411         dev_dbg(&port->dev, "baud set = %u\n", baud);
412 }
413 
414 static int pl2303_get_line_request(struct usb_serial_port *port,
415                                                         unsigned char buf[7])
416 {
417         struct usb_device *udev = port->serial->dev;
418         int ret;
419 
420         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
421                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
422                                 0, 0, buf, 7, 100);
423         if (ret != 7) {
424                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
425 
426                 if (ret > 0)
427                         ret = -EIO;
428 
429                 return ret;
430         }
431 
432         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
433 
434         return 0;
435 }
436 
437 static int pl2303_set_line_request(struct usb_serial_port *port,
438                                                         unsigned char buf[7])
439 {
440         struct usb_device *udev = port->serial->dev;
441         int ret;
442 
443         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
444                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
445                                 0, 0, buf, 7, 100);
446         if (ret != 7) {
447                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
448 
449                 if (ret > 0)
450                         ret = -EIO;
451 
452                 return ret;
453         }
454 
455         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
456 
457         return 0;
458 }
459 
460 static void pl2303_set_termios(struct tty_struct *tty,
461                 struct usb_serial_port *port, struct ktermios *old_termios)
462 {
463         struct usb_serial *serial = port->serial;
464         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
465         struct pl2303_private *priv = usb_get_serial_port_data(port);
466         unsigned long flags;
467         unsigned char *buf;
468         int ret;
469         u8 control;
470 
471         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
472                 return;
473 
474         buf = kzalloc(7, GFP_KERNEL);
475         if (!buf) {
476                 /* Report back no change occurred */
477                 if (old_termios)
478                         tty->termios = *old_termios;
479                 return;
480         }
481 
482         pl2303_get_line_request(port, buf);
483 
484         switch (C_CSIZE(tty)) {
485         case CS5:
486                 buf[6] = 5;
487                 break;
488         case CS6:
489                 buf[6] = 6;
490                 break;
491         case CS7:
492                 buf[6] = 7;
493                 break;
494         default:
495         case CS8:
496                 buf[6] = 8;
497         }
498         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
499 
500         /* For reference buf[0]:buf[3] baud rate value */
501         pl2303_encode_baud_rate(tty, port, &buf[0]);
502 
503         /* For reference buf[4]=0 is 1 stop bits */
504         /* For reference buf[4]=1 is 1.5 stop bits */
505         /* For reference buf[4]=2 is 2 stop bits */
506         if (C_CSTOPB(tty)) {
507                 /*
508                  * NOTE: Comply with "real" UARTs / RS232:
509                  *       use 1.5 instead of 2 stop bits with 5 data bits
510                  */
511                 if (C_CSIZE(tty) == CS5) {
512                         buf[4] = 1;
513                         dev_dbg(&port->dev, "stop bits = 1.5\n");
514                 } else {
515                         buf[4] = 2;
516                         dev_dbg(&port->dev, "stop bits = 2\n");
517                 }
518         } else {
519                 buf[4] = 0;
520                 dev_dbg(&port->dev, "stop bits = 1\n");
521         }
522 
523         if (C_PARENB(tty)) {
524                 /* For reference buf[5]=0 is none parity */
525                 /* For reference buf[5]=1 is odd parity */
526                 /* For reference buf[5]=2 is even parity */
527                 /* For reference buf[5]=3 is mark parity */
528                 /* For reference buf[5]=4 is space parity */
529                 if (C_PARODD(tty)) {
530                         if (C_CMSPAR(tty)) {
531                                 buf[5] = 3;
532                                 dev_dbg(&port->dev, "parity = mark\n");
533                         } else {
534                                 buf[5] = 1;
535                                 dev_dbg(&port->dev, "parity = odd\n");
536                         }
537                 } else {
538                         if (C_CMSPAR(tty)) {
539                                 buf[5] = 4;
540                                 dev_dbg(&port->dev, "parity = space\n");
541                         } else {
542                                 buf[5] = 2;
543                                 dev_dbg(&port->dev, "parity = even\n");
544                         }
545                 }
546         } else {
547                 buf[5] = 0;
548                 dev_dbg(&port->dev, "parity = none\n");
549         }
550 
551         /*
552          * Some PL2303 are known to lose bytes if you change serial settings
553          * even to the same values as before. Thus we actually need to filter
554          * in this specific case.
555          *
556          * Note that the tty_termios_hw_change check above is not sufficient
557          * as a previously requested baud rate may differ from the one
558          * actually used (and stored in old_termios).
559          *
560          * NOTE: No additional locking needed for line_settings as it is
561          *       only used in set_termios, which is serialised against itself.
562          */
563         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
564                 ret = pl2303_set_line_request(port, buf);
565                 if (!ret)
566                         memcpy(priv->line_settings, buf, 7);
567         }
568 
569         /* change control lines if we are switching to or from B0 */
570         spin_lock_irqsave(&priv->lock, flags);
571         control = priv->line_control;
572         if (C_BAUD(tty) == B0)
573                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
574         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
575                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
576         if (control != priv->line_control) {
577                 control = priv->line_control;
578                 spin_unlock_irqrestore(&priv->lock, flags);
579                 pl2303_set_control_lines(port, control);
580         } else {
581                 spin_unlock_irqrestore(&priv->lock, flags);
582         }
583 
584         if (C_CRTSCTS(tty)) {
585                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
586                         pl2303_vendor_write(serial, 0x0, 0x41);
587                 else
588                         pl2303_vendor_write(serial, 0x0, 0x61);
589         } else {
590                 pl2303_vendor_write(serial, 0x0, 0x0);
591         }
592 
593         kfree(buf);
594 }
595 
596 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
597 {
598         struct pl2303_private *priv = usb_get_serial_port_data(port);
599         unsigned long flags;
600         u8 control;
601 
602         spin_lock_irqsave(&priv->lock, flags);
603         if (on)
604                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
605         else
606                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
607         control = priv->line_control;
608         spin_unlock_irqrestore(&priv->lock, flags);
609 
610         pl2303_set_control_lines(port, control);
611 }
612 
613 static void pl2303_close(struct usb_serial_port *port)
614 {
615         usb_serial_generic_close(port);
616         usb_kill_urb(port->interrupt_in_urb);
617 }
618 
619 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
620 {
621         struct usb_serial *serial = port->serial;
622         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
623         int result;
624 
625         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
626                 usb_clear_halt(serial->dev, port->write_urb->pipe);
627                 usb_clear_halt(serial->dev, port->read_urb->pipe);
628         } else {
629                 /* reset upstream data pipes */
630                 pl2303_vendor_write(serial, 8, 0);
631                 pl2303_vendor_write(serial, 9, 0);
632         }
633 
634         /* Setup termios */
635         if (tty)
636                 pl2303_set_termios(tty, port, NULL);
637 
638         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
639         if (result) {
640                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
641                         result);
642                 return result;
643         }
644 
645         result = usb_serial_generic_open(tty, port);
646         if (result) {
647                 usb_kill_urb(port->interrupt_in_urb);
648                 return result;
649         }
650 
651         return 0;
652 }
653 
654 static int pl2303_tiocmset(struct tty_struct *tty,
655                            unsigned int set, unsigned int clear)
656 {
657         struct usb_serial_port *port = tty->driver_data;
658         struct pl2303_private *priv = usb_get_serial_port_data(port);
659         unsigned long flags;
660         u8 control;
661         int ret;
662 
663         spin_lock_irqsave(&priv->lock, flags);
664         if (set & TIOCM_RTS)
665                 priv->line_control |= CONTROL_RTS;
666         if (set & TIOCM_DTR)
667                 priv->line_control |= CONTROL_DTR;
668         if (clear & TIOCM_RTS)
669                 priv->line_control &= ~CONTROL_RTS;
670         if (clear & TIOCM_DTR)
671                 priv->line_control &= ~CONTROL_DTR;
672         control = priv->line_control;
673         spin_unlock_irqrestore(&priv->lock, flags);
674 
675         ret = pl2303_set_control_lines(port, control);
676         if (ret)
677                 return usb_translate_errors(ret);
678 
679         return 0;
680 }
681 
682 static int pl2303_tiocmget(struct tty_struct *tty)
683 {
684         struct usb_serial_port *port = tty->driver_data;
685         struct pl2303_private *priv = usb_get_serial_port_data(port);
686         unsigned long flags;
687         unsigned int mcr;
688         unsigned int status;
689         unsigned int result;
690 
691         spin_lock_irqsave(&priv->lock, flags);
692         mcr = priv->line_control;
693         status = priv->line_status;
694         spin_unlock_irqrestore(&priv->lock, flags);
695 
696         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
697                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
698                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
699                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
700                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
701                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
702 
703         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
704 
705         return result;
706 }
707 
708 static int pl2303_carrier_raised(struct usb_serial_port *port)
709 {
710         struct pl2303_private *priv = usb_get_serial_port_data(port);
711 
712         if (priv->line_status & UART_DCD)
713                 return 1;
714 
715         return 0;
716 }
717 
718 static int pl2303_ioctl(struct tty_struct *tty,
719                         unsigned int cmd, unsigned long arg)
720 {
721         struct serial_struct ser;
722         struct usb_serial_port *port = tty->driver_data;
723 
724         switch (cmd) {
725         case TIOCGSERIAL:
726                 memset(&ser, 0, sizeof ser);
727                 ser.type = PORT_16654;
728                 ser.line = port->minor;
729                 ser.port = port->port_number;
730                 ser.baud_base = 460800;
731 
732                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
733                         return -EFAULT;
734 
735                 return 0;
736         default:
737                 break;
738         }
739 
740         return -ENOIOCTLCMD;
741 }
742 
743 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
744 {
745         struct usb_serial_port *port = tty->driver_data;
746         struct usb_serial *serial = port->serial;
747         u16 state;
748         int result;
749 
750         if (break_state == 0)
751                 state = BREAK_OFF;
752         else
753                 state = BREAK_ON;
754 
755         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
756                         state == BREAK_OFF ? "off" : "on");
757 
758         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
759                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
760                                  0, NULL, 0, 100);
761         if (result)
762                 dev_err(&port->dev, "error sending break = %d\n", result);
763 }
764 
765 static void pl2303_update_line_status(struct usb_serial_port *port,
766                                       unsigned char *data,
767                                       unsigned int actual_length)
768 {
769         struct usb_serial *serial = port->serial;
770         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
771         struct pl2303_private *priv = usb_get_serial_port_data(port);
772         struct tty_struct *tty;
773         unsigned long flags;
774         unsigned int status_idx = UART_STATE_INDEX;
775         u8 status;
776         u8 delta;
777 
778         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
779                 status_idx = 0;
780 
781         if (actual_length < status_idx + 1)
782                 return;
783 
784         status = data[status_idx];
785 
786         /* Save off the uart status for others to look at */
787         spin_lock_irqsave(&priv->lock, flags);
788         delta = priv->line_status ^ status;
789         priv->line_status = status;
790         spin_unlock_irqrestore(&priv->lock, flags);
791 
792         if (status & UART_BREAK_ERROR)
793                 usb_serial_handle_break(port);
794 
795         if (delta & UART_STATE_MSR_MASK) {
796                 if (delta & UART_CTS)
797                         port->icount.cts++;
798                 if (delta & UART_DSR)
799                         port->icount.dsr++;
800                 if (delta & UART_RING)
801                         port->icount.rng++;
802                 if (delta & UART_DCD) {
803                         port->icount.dcd++;
804                         tty = tty_port_tty_get(&port->port);
805                         if (tty) {
806                                 usb_serial_handle_dcd_change(port, tty,
807                                                         status & UART_DCD);
808                                 tty_kref_put(tty);
809                         }
810                 }
811 
812                 wake_up_interruptible(&port->port.delta_msr_wait);
813         }
814 }
815 
816 static void pl2303_read_int_callback(struct urb *urb)
817 {
818         struct usb_serial_port *port =  urb->context;
819         unsigned char *data = urb->transfer_buffer;
820         unsigned int actual_length = urb->actual_length;
821         int status = urb->status;
822         int retval;
823 
824         switch (status) {
825         case 0:
826                 /* success */
827                 break;
828         case -ECONNRESET:
829         case -ENOENT:
830         case -ESHUTDOWN:
831                 /* this urb is terminated, clean up */
832                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
833                         __func__, status);
834                 return;
835         default:
836                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
837                         __func__, status);
838                 goto exit;
839         }
840 
841         usb_serial_debug_data(&port->dev, __func__,
842                               urb->actual_length, urb->transfer_buffer);
843 
844         pl2303_update_line_status(port, data, actual_length);
845 
846 exit:
847         retval = usb_submit_urb(urb, GFP_ATOMIC);
848         if (retval) {
849                 dev_err(&port->dev,
850                         "%s - usb_submit_urb failed with result %d\n",
851                         __func__, retval);
852         }
853 }
854 
855 static void pl2303_process_read_urb(struct urb *urb)
856 {
857         struct usb_serial_port *port = urb->context;
858         struct pl2303_private *priv = usb_get_serial_port_data(port);
859         unsigned char *data = urb->transfer_buffer;
860         char tty_flag = TTY_NORMAL;
861         unsigned long flags;
862         u8 line_status;
863         int i;
864 
865         /* update line status */
866         spin_lock_irqsave(&priv->lock, flags);
867         line_status = priv->line_status;
868         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
869         spin_unlock_irqrestore(&priv->lock, flags);
870 
871         if (!urb->actual_length)
872                 return;
873 
874         /*
875          * Break takes precedence over parity, which takes precedence over
876          * framing errors.
877          */
878         if (line_status & UART_BREAK_ERROR)
879                 tty_flag = TTY_BREAK;
880         else if (line_status & UART_PARITY_ERROR)
881                 tty_flag = TTY_PARITY;
882         else if (line_status & UART_FRAME_ERROR)
883                 tty_flag = TTY_FRAME;
884 
885         if (tty_flag != TTY_NORMAL)
886                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
887                                                                 tty_flag);
888         /* overrun is special, not associated with a char */
889         if (line_status & UART_OVERRUN_ERROR)
890                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
891 
892         if (port->port.console && port->sysrq) {
893                 for (i = 0; i < urb->actual_length; ++i)
894                         if (!usb_serial_handle_sysrq_char(port, data[i]))
895                                 tty_insert_flip_char(&port->port, data[i],
896                                                 tty_flag);
897         } else {
898                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
899                                                         urb->actual_length);
900         }
901 
902         tty_flip_buffer_push(&port->port);
903 }
904 
905 static struct usb_serial_driver pl2303_device = {
906         .driver = {
907                 .owner =        THIS_MODULE,
908                 .name =         "pl2303",
909         },
910         .id_table =             id_table,
911         .num_ports =            1,
912         .bulk_in_size =         256,
913         .bulk_out_size =        256,
914         .open =                 pl2303_open,
915         .close =                pl2303_close,
916         .dtr_rts =              pl2303_dtr_rts,
917         .carrier_raised =       pl2303_carrier_raised,
918         .ioctl =                pl2303_ioctl,
919         .break_ctl =            pl2303_break_ctl,
920         .set_termios =          pl2303_set_termios,
921         .tiocmget =             pl2303_tiocmget,
922         .tiocmset =             pl2303_tiocmset,
923         .tiocmiwait =           usb_serial_generic_tiocmiwait,
924         .process_read_urb =     pl2303_process_read_urb,
925         .read_int_callback =    pl2303_read_int_callback,
926         .probe =                pl2303_probe,
927         .attach =               pl2303_startup,
928         .release =              pl2303_release,
929         .port_probe =           pl2303_port_probe,
930         .port_remove =          pl2303_port_remove,
931 };
932 
933 static struct usb_serial_driver * const serial_drivers[] = {
934         &pl2303_device, NULL
935 };
936 
937 module_usb_serial_driver(serial_drivers, id_table);
938 
939 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
940 MODULE_LICENSE("GPL");
941 

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