xref: /linux/drivers/usb/serial/pl2303.c (revision 6e8331ac6973435b1e7604c30f2ad394035b46e1)
1 /*
2  * Prolific PL2303 USB to serial adaptor driver
3  *
4  * Copyright (C) 2001-2004 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 modify
10  *	it under the terms of the GNU General Public License as published by
11  *	the Free Software Foundation; either version 2 of the License.
12  *
13  * See Documentation/usb/usb-serial.txt for more information on using this driver
14  *
15  */
16 
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/tty.h>
22 #include <linux/tty_driver.h>
23 #include <linux/tty_flip.h>
24 #include <linux/serial.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/spinlock.h>
28 #include <asm/uaccess.h>
29 #include <linux/usb.h>
30 #include <linux/usb/serial.h>
31 #include "pl2303.h"
32 
33 /*
34  * Version Information
35  */
36 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
37 
38 static int debug;
39 
40 #define PL2303_CLOSING_WAIT	(30*HZ)
41 
42 #define PL2303_BUF_SIZE		1024
43 #define PL2303_TMP_BUF_SIZE	1024
44 
45 struct pl2303_buf {
46 	unsigned int	buf_size;
47 	char		*buf_buf;
48 	char		*buf_get;
49 	char		*buf_put;
50 };
51 
52 static struct usb_device_id id_table [] = {
53 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
54 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
55 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
56 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
57 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
58 	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
59 	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
60 	{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
61 	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
62 	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
63 	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
64 	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
65 	{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
66 	{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
67 	{ USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
68 	{ USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
69 	{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
70 	{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
71 	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
72 	{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
73 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
74 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
75 	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
76 	{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
77 	{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
78 	{ USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
79 	{ USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
80 	{ USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
81 	{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
82 	{ USB_DEVICE(OTI_VENDOR_ID, OTI_PRODUCT_ID) },
83 	{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
84 	{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
85 	{ }					/* Terminating entry */
86 };
87 
88 MODULE_DEVICE_TABLE (usb, id_table);
89 
90 static struct usb_driver pl2303_driver = {
91 	.name =		"pl2303",
92 	.probe =	usb_serial_probe,
93 	.disconnect =	usb_serial_disconnect,
94 	.id_table =	id_table,
95 	.no_dynamic_id = 	1,
96 };
97 
98 #define SET_LINE_REQUEST_TYPE		0x21
99 #define SET_LINE_REQUEST		0x20
100 
101 #define SET_CONTROL_REQUEST_TYPE	0x21
102 #define SET_CONTROL_REQUEST		0x22
103 #define CONTROL_DTR			0x01
104 #define CONTROL_RTS			0x02
105 
106 #define BREAK_REQUEST_TYPE		0x21
107 #define BREAK_REQUEST			0x23
108 #define BREAK_ON			0xffff
109 #define BREAK_OFF			0x0000
110 
111 #define GET_LINE_REQUEST_TYPE		0xa1
112 #define GET_LINE_REQUEST		0x21
113 
114 #define VENDOR_WRITE_REQUEST_TYPE	0x40
115 #define VENDOR_WRITE_REQUEST		0x01
116 
117 #define VENDOR_READ_REQUEST_TYPE	0xc0
118 #define VENDOR_READ_REQUEST		0x01
119 
120 #define UART_STATE			0x08
121 #define UART_STATE_TRANSIENT_MASK	0x74
122 #define UART_DCD			0x01
123 #define UART_DSR			0x02
124 #define UART_BREAK_ERROR		0x04
125 #define UART_RING			0x08
126 #define UART_FRAME_ERROR		0x10
127 #define UART_PARITY_ERROR		0x20
128 #define UART_OVERRUN_ERROR		0x40
129 #define UART_CTS			0x80
130 
131 /* function prototypes for a PL2303 serial converter */
132 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
133 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
134 static void pl2303_set_termios (struct usb_serial_port *port,
135 				struct termios *old);
136 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
137 			 unsigned int cmd, unsigned long arg);
138 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
139 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
140 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
141 static int pl2303_write (struct usb_serial_port *port,
142 			 const unsigned char *buf, int count);
143 static void pl2303_send (struct usb_serial_port *port);
144 static int pl2303_write_room(struct usb_serial_port *port);
145 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
146 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
147 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
148 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
149 			    unsigned int set, unsigned int clear);
150 static int pl2303_startup (struct usb_serial *serial);
151 static void pl2303_shutdown (struct usb_serial *serial);
152 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
153 static void pl2303_buf_free(struct pl2303_buf *pb);
154 static void pl2303_buf_clear(struct pl2303_buf *pb);
155 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
156 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
157 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
158 	unsigned int count);
159 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
160 	unsigned int count);
161 
162 
163 /* All of the device info needed for the PL2303 SIO serial converter */
164 static struct usb_serial_driver pl2303_device = {
165 	.driver = {
166 		.owner =	THIS_MODULE,
167 		.name =		"pl2303",
168 	},
169 	.id_table =		id_table,
170 	.num_interrupt_in =	NUM_DONT_CARE,
171 	.num_bulk_in =		1,
172 	.num_bulk_out =		1,
173 	.num_ports =		1,
174 	.open =			pl2303_open,
175 	.close =		pl2303_close,
176 	.write =		pl2303_write,
177 	.ioctl =		pl2303_ioctl,
178 	.break_ctl =		pl2303_break_ctl,
179 	.set_termios =		pl2303_set_termios,
180 	.tiocmget =		pl2303_tiocmget,
181 	.tiocmset =		pl2303_tiocmset,
182 	.read_bulk_callback =	pl2303_read_bulk_callback,
183 	.read_int_callback =	pl2303_read_int_callback,
184 	.write_bulk_callback =	pl2303_write_bulk_callback,
185 	.write_room =		pl2303_write_room,
186 	.chars_in_buffer =	pl2303_chars_in_buffer,
187 	.attach =		pl2303_startup,
188 	.shutdown =		pl2303_shutdown,
189 };
190 
191 enum pl2303_type {
192 	type_0,		/* don't know the difference between type 0 and */
193 	type_1,		/* type 1, until someone from prolific tells us... */
194 	HX,		/* HX version of the pl2303 chip */
195 };
196 
197 struct pl2303_private {
198 	spinlock_t lock;
199 	struct pl2303_buf *buf;
200 	int write_urb_in_use;
201 	wait_queue_head_t delta_msr_wait;
202 	u8 line_control;
203 	u8 line_status;
204 	u8 termios_initialized;
205 	enum pl2303_type type;
206 };
207 
208 
209 static int pl2303_startup (struct usb_serial *serial)
210 {
211 	struct pl2303_private *priv;
212 	enum pl2303_type type = type_0;
213 	int i;
214 
215 	if (serial->dev->descriptor.bDeviceClass == 0x02)
216 		type = type_0;
217 	else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
218 		type = HX;
219 	else if (serial->dev->descriptor.bDeviceClass == 0x00)
220 		type = type_1;
221 	else if (serial->dev->descriptor.bDeviceClass == 0xFF)
222 		type = type_1;
223 	dbg("device type: %d", type);
224 
225 	for (i = 0; i < serial->num_ports; ++i) {
226 		priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
227 		if (!priv)
228 			goto cleanup;
229 		spin_lock_init(&priv->lock);
230 		priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
231 		if (priv->buf == NULL) {
232 			kfree(priv);
233 			goto cleanup;
234 		}
235 		init_waitqueue_head(&priv->delta_msr_wait);
236 		priv->type = type;
237 		usb_set_serial_port_data(serial->port[i], priv);
238 	}
239 	return 0;
240 
241 cleanup:
242 	for (--i; i>=0; --i) {
243 		priv = usb_get_serial_port_data(serial->port[i]);
244 		pl2303_buf_free(priv->buf);
245 		kfree(priv);
246 		usb_set_serial_port_data(serial->port[i], NULL);
247 	}
248 	return -ENOMEM;
249 }
250 
251 static int set_control_lines (struct usb_device *dev, u8 value)
252 {
253 	int retval;
254 
255 	retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
256 				  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
257 				  value, 0, NULL, 0, 100);
258 	dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
259 	return retval;
260 }
261 
262 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
263 {
264 	struct pl2303_private *priv = usb_get_serial_port_data(port);
265 	unsigned long flags;
266 
267 	dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
268 
269 	if (!count)
270 		return count;
271 
272 	spin_lock_irqsave(&priv->lock, flags);
273 	count = pl2303_buf_put(priv->buf, buf, count);
274 	spin_unlock_irqrestore(&priv->lock, flags);
275 
276 	pl2303_send(port);
277 
278 	return count;
279 }
280 
281 static void pl2303_send(struct usb_serial_port *port)
282 {
283 	int count, result;
284 	struct pl2303_private *priv = usb_get_serial_port_data(port);
285 	unsigned long flags;
286 
287 	dbg("%s - port %d", __FUNCTION__, port->number);
288 
289 	spin_lock_irqsave(&priv->lock, flags);
290 
291 	if (priv->write_urb_in_use) {
292 		spin_unlock_irqrestore(&priv->lock, flags);
293 		return;
294 	}
295 
296 	count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
297 		port->bulk_out_size);
298 
299 	if (count == 0) {
300 		spin_unlock_irqrestore(&priv->lock, flags);
301 		return;
302 	}
303 
304 	priv->write_urb_in_use = 1;
305 
306 	spin_unlock_irqrestore(&priv->lock, flags);
307 
308 	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
309 
310 	port->write_urb->transfer_buffer_length = count;
311 	port->write_urb->dev = port->serial->dev;
312 	result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
313 	if (result) {
314 		dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
315 		priv->write_urb_in_use = 0;
316 		// TODO: reschedule pl2303_send
317 	}
318 
319 	usb_serial_port_softint(port);
320 }
321 
322 static int pl2303_write_room(struct usb_serial_port *port)
323 {
324 	struct pl2303_private *priv = usb_get_serial_port_data(port);
325 	int room = 0;
326 	unsigned long flags;
327 
328 	dbg("%s - port %d", __FUNCTION__, port->number);
329 
330 	spin_lock_irqsave(&priv->lock, flags);
331 	room = pl2303_buf_space_avail(priv->buf);
332 	spin_unlock_irqrestore(&priv->lock, flags);
333 
334 	dbg("%s - returns %d", __FUNCTION__, room);
335 	return room;
336 }
337 
338 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
339 {
340 	struct pl2303_private *priv = usb_get_serial_port_data(port);
341 	int chars = 0;
342 	unsigned long flags;
343 
344 	dbg("%s - port %d", __FUNCTION__, port->number);
345 
346 	spin_lock_irqsave(&priv->lock, flags);
347 	chars = pl2303_buf_data_avail(priv->buf);
348 	spin_unlock_irqrestore(&priv->lock, flags);
349 
350 	dbg("%s - returns %d", __FUNCTION__, chars);
351 	return chars;
352 }
353 
354 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
355 {
356 	struct usb_serial *serial = port->serial;
357 	struct pl2303_private *priv = usb_get_serial_port_data(port);
358 	unsigned long flags;
359 	unsigned int cflag;
360 	unsigned char *buf;
361 	int baud;
362 	int i;
363 	u8 control;
364 
365 	dbg("%s -  port %d", __FUNCTION__, port->number);
366 
367 	if ((!port->tty) || (!port->tty->termios)) {
368 		dbg("%s - no tty structures", __FUNCTION__);
369 		return;
370 	}
371 
372 	spin_lock_irqsave(&priv->lock, flags);
373 	if (!priv->termios_initialized) {
374 		*(port->tty->termios) = tty_std_termios;
375 		port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
376 		priv->termios_initialized = 1;
377 	}
378 	spin_unlock_irqrestore(&priv->lock, flags);
379 
380 	cflag = port->tty->termios->c_cflag;
381 	/* check that they really want us to change something */
382 	if (old_termios) {
383 		if ((cflag == old_termios->c_cflag) &&
384 		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
385 		    dbg("%s - nothing to change...", __FUNCTION__);
386 		    return;
387 		}
388 	}
389 
390 	buf = kzalloc (7, GFP_KERNEL);
391 	if (!buf) {
392 		dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
393 		return;
394 	}
395 
396 	i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
397 			     GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
398 			     0, 0, buf, 7, 100);
399 	dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
400 	     buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
401 
402 
403 	if (cflag & CSIZE) {
404 		switch (cflag & CSIZE) {
405 			case CS5:	buf[6] = 5;	break;
406 			case CS6:	buf[6] = 6;	break;
407 			case CS7:	buf[6] = 7;	break;
408 			default:
409 			case CS8:	buf[6] = 8;	break;
410 		}
411 		dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
412 	}
413 
414 	baud = 0;
415 	switch (cflag & CBAUD) {
416 		case B0:	baud = 0;	break;
417 		case B75:	baud = 75;	break;
418 		case B150:	baud = 150;	break;
419 		case B300:	baud = 300;	break;
420 		case B600:	baud = 600;	break;
421 		case B1200:	baud = 1200;	break;
422 		case B1800:	baud = 1800;	break;
423 		case B2400:	baud = 2400;	break;
424 		case B4800:	baud = 4800;	break;
425 		case B9600:	baud = 9600;	break;
426 		case B19200:	baud = 19200;	break;
427 		case B38400:	baud = 38400;	break;
428 		case B57600:	baud = 57600;	break;
429 		case B115200:	baud = 115200;	break;
430 		case B230400:	baud = 230400;	break;
431 		case B460800:	baud = 460800;	break;
432 		default:
433 			dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
434 			break;
435 	}
436 	dbg("%s - baud = %d", __FUNCTION__, baud);
437 	if (baud) {
438 		buf[0] = baud & 0xff;
439 		buf[1] = (baud >> 8) & 0xff;
440 		buf[2] = (baud >> 16) & 0xff;
441 		buf[3] = (baud >> 24) & 0xff;
442 	}
443 
444 	/* For reference buf[4]=0 is 1 stop bits */
445 	/* For reference buf[4]=1 is 1.5 stop bits */
446 	/* For reference buf[4]=2 is 2 stop bits */
447 	if (cflag & CSTOPB) {
448 		buf[4] = 2;
449 		dbg("%s - stop bits = 2", __FUNCTION__);
450 	} else {
451 		buf[4] = 0;
452 		dbg("%s - stop bits = 1", __FUNCTION__);
453 	}
454 
455 	if (cflag & PARENB) {
456 		/* For reference buf[5]=0 is none parity */
457 		/* For reference buf[5]=1 is odd parity */
458 		/* For reference buf[5]=2 is even parity */
459 		/* For reference buf[5]=3 is mark parity */
460 		/* For reference buf[5]=4 is space parity */
461 		if (cflag & PARODD) {
462 			buf[5] = 1;
463 			dbg("%s - parity = odd", __FUNCTION__);
464 		} else {
465 			buf[5] = 2;
466 			dbg("%s - parity = even", __FUNCTION__);
467 		}
468 	} else {
469 		buf[5] = 0;
470 		dbg("%s - parity = none", __FUNCTION__);
471 	}
472 
473 	i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
474 			     SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
475 			     0, 0, buf, 7, 100);
476 	dbg ("0x21:0x20:0:0  %d", i);
477 
478 	/* change control lines if we are switching to or from B0 */
479 	spin_lock_irqsave(&priv->lock, flags);
480 	control = priv->line_control;
481 	if ((cflag & CBAUD) == B0)
482 		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
483 	else
484 		priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
485 	if (control != priv->line_control) {
486 		control = priv->line_control;
487 		spin_unlock_irqrestore(&priv->lock, flags);
488 		set_control_lines(serial->dev, control);
489 	} else {
490 		spin_unlock_irqrestore(&priv->lock, flags);
491 	}
492 
493 	buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
494 
495 	i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
496 			     GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
497 			     0, 0, buf, 7, 100);
498 	dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
499 	     buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
500 
501 	if (cflag & CRTSCTS) {
502 		__u16 index;
503 		if (priv->type == HX)
504 			index = 0x61;
505 		else
506 			index = 0x41;
507 		i = usb_control_msg(serial->dev,
508 				    usb_sndctrlpipe(serial->dev, 0),
509 				    VENDOR_WRITE_REQUEST,
510 				    VENDOR_WRITE_REQUEST_TYPE,
511 				    0x0, index, NULL, 0, 100);
512 		dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
513 	}
514 
515 	kfree (buf);
516 }
517 
518 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
519 {
520 	struct termios tmp_termios;
521 	struct usb_serial *serial = port->serial;
522 	struct pl2303_private *priv = usb_get_serial_port_data(port);
523 	unsigned char *buf;
524 	int result;
525 
526 	dbg("%s -  port %d", __FUNCTION__, port->number);
527 
528 	if (priv->type != HX) {
529 		usb_clear_halt(serial->dev, port->write_urb->pipe);
530 		usb_clear_halt(serial->dev, port->read_urb->pipe);
531 	}
532 
533 	buf = kmalloc(10, GFP_KERNEL);
534 	if (buf==NULL)
535 		return -ENOMEM;
536 
537 #define FISH(a,b,c,d)								\
538 	result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),	\
539 			       b, a, c, d, buf, 1, 100);			\
540 	dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
541 
542 #define SOUP(a,b,c,d)								\
543 	result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),	\
544 			       b, a, c, d, NULL, 0, 100);			\
545 	dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
546 
547 	FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
548 	SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
549 	FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
550 	FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
551 	FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
552 	SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
553 	FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
554 	FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
555 	SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
556 	SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
557 
558 	if (priv->type == HX) {
559 		/* HX chip */
560 		SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
561 		/* reset upstream data pipes */
562           	SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
563         	SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
564 	} else {
565 		SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
566 	}
567 
568 	kfree(buf);
569 
570 	/* Setup termios */
571 	if (port->tty) {
572 		pl2303_set_termios (port, &tmp_termios);
573 	}
574 
575 	//FIXME: need to assert RTS and DTR if CRTSCTS off
576 
577 	dbg("%s - submitting read urb", __FUNCTION__);
578 	port->read_urb->dev = serial->dev;
579 	result = usb_submit_urb (port->read_urb, GFP_KERNEL);
580 	if (result) {
581 		dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
582 		pl2303_close (port, NULL);
583 		return -EPROTO;
584 	}
585 
586 	dbg("%s - submitting interrupt urb", __FUNCTION__);
587 	port->interrupt_in_urb->dev = serial->dev;
588 	result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
589 	if (result) {
590 		dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
591 		pl2303_close (port, NULL);
592 		return -EPROTO;
593 	}
594 	return 0;
595 }
596 
597 
598 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
599 {
600 	struct pl2303_private *priv = usb_get_serial_port_data(port);
601 	unsigned long flags;
602 	unsigned int c_cflag;
603 	int bps;
604 	long timeout;
605 	wait_queue_t wait;
606 
607 	dbg("%s - port %d", __FUNCTION__, port->number);
608 
609 	/* wait for data to drain from the buffer */
610 	spin_lock_irqsave(&priv->lock, flags);
611 	timeout = PL2303_CLOSING_WAIT;
612 	init_waitqueue_entry(&wait, current);
613 	add_wait_queue(&port->tty->write_wait, &wait);
614 	for (;;) {
615 		set_current_state(TASK_INTERRUPTIBLE);
616 		if (pl2303_buf_data_avail(priv->buf) == 0
617 		|| timeout == 0 || signal_pending(current)
618 		|| !usb_get_intfdata(port->serial->interface))	/* disconnect */
619 			break;
620 		spin_unlock_irqrestore(&priv->lock, flags);
621 		timeout = schedule_timeout(timeout);
622 		spin_lock_irqsave(&priv->lock, flags);
623 	}
624 	set_current_state(TASK_RUNNING);
625 	remove_wait_queue(&port->tty->write_wait, &wait);
626 	/* clear out any remaining data in the buffer */
627 	pl2303_buf_clear(priv->buf);
628 	spin_unlock_irqrestore(&priv->lock, flags);
629 
630 	/* wait for characters to drain from the device */
631 	/* (this is long enough for the entire 256 byte */
632 	/* pl2303 hardware buffer to drain with no flow */
633 	/* control for data rates of 1200 bps or more, */
634 	/* for lower rates we should really know how much */
635 	/* data is in the buffer to compute a delay */
636 	/* that is not unnecessarily long) */
637 	bps = tty_get_baud_rate(port->tty);
638 	if (bps > 1200)
639 		timeout = max((HZ*2560)/bps,HZ/10);
640 	else
641 		timeout = 2*HZ;
642 	schedule_timeout_interruptible(timeout);
643 
644 	/* shutdown our urbs */
645 	dbg("%s - shutting down urbs", __FUNCTION__);
646 	usb_kill_urb(port->write_urb);
647 	usb_kill_urb(port->read_urb);
648 	usb_kill_urb(port->interrupt_in_urb);
649 
650 	if (port->tty) {
651 		c_cflag = port->tty->termios->c_cflag;
652 		if (c_cflag & HUPCL) {
653 			/* drop DTR and RTS */
654 			spin_lock_irqsave(&priv->lock, flags);
655 			priv->line_control = 0;
656 			spin_unlock_irqrestore (&priv->lock, flags);
657 			set_control_lines (port->serial->dev, 0);
658 		}
659 	}
660 }
661 
662 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
663 			    unsigned int set, unsigned int clear)
664 {
665 	struct pl2303_private *priv = usb_get_serial_port_data(port);
666 	unsigned long flags;
667 	u8 control;
668 
669 	if (!usb_get_intfdata(port->serial->interface))
670 		return -ENODEV;
671 
672 	spin_lock_irqsave (&priv->lock, flags);
673 	if (set & TIOCM_RTS)
674 		priv->line_control |= CONTROL_RTS;
675 	if (set & TIOCM_DTR)
676 		priv->line_control |= CONTROL_DTR;
677 	if (clear & TIOCM_RTS)
678 		priv->line_control &= ~CONTROL_RTS;
679 	if (clear & TIOCM_DTR)
680 		priv->line_control &= ~CONTROL_DTR;
681 	control = priv->line_control;
682 	spin_unlock_irqrestore (&priv->lock, flags);
683 
684 	return set_control_lines (port->serial->dev, control);
685 }
686 
687 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
688 {
689 	struct pl2303_private *priv = usb_get_serial_port_data(port);
690 	unsigned long flags;
691 	unsigned int mcr;
692 	unsigned int status;
693 	unsigned int result;
694 
695 	dbg("%s (%d)", __FUNCTION__, port->number);
696 
697 	if (!usb_get_intfdata(port->serial->interface))
698 		return -ENODEV;
699 
700 	spin_lock_irqsave (&priv->lock, flags);
701 	mcr = priv->line_control;
702 	status = priv->line_status;
703 	spin_unlock_irqrestore (&priv->lock, flags);
704 
705 	result = ((mcr & CONTROL_DTR)		? TIOCM_DTR : 0)
706 		  | ((mcr & CONTROL_RTS)	? TIOCM_RTS : 0)
707 		  | ((status & UART_CTS)	? TIOCM_CTS : 0)
708 		  | ((status & UART_DSR)	? TIOCM_DSR : 0)
709 		  | ((status & UART_RING)	? TIOCM_RI  : 0)
710 		  | ((status & UART_DCD)	? TIOCM_CD  : 0);
711 
712 	dbg("%s - result = %x", __FUNCTION__, result);
713 
714 	return result;
715 }
716 
717 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
718 {
719 	struct pl2303_private *priv = usb_get_serial_port_data(port);
720 	unsigned long flags;
721 	unsigned int prevstatus;
722 	unsigned int status;
723 	unsigned int changed;
724 
725 	spin_lock_irqsave (&priv->lock, flags);
726 	prevstatus = priv->line_status;
727 	spin_unlock_irqrestore (&priv->lock, flags);
728 
729 	while (1) {
730 		interruptible_sleep_on(&priv->delta_msr_wait);
731 		/* see if a signal did it */
732 		if (signal_pending(current))
733 			return -ERESTARTSYS;
734 
735 		spin_lock_irqsave (&priv->lock, flags);
736 		status = priv->line_status;
737 		spin_unlock_irqrestore (&priv->lock, flags);
738 
739 		changed=prevstatus^status;
740 
741 		if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
742 		    ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
743 		    ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
744 		    ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
745 			return 0;
746 		}
747 		prevstatus = status;
748 	}
749 	/* NOTREACHED */
750 	return 0;
751 }
752 
753 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
754 {
755 	dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
756 
757 	switch (cmd) {
758 		case TIOCMIWAIT:
759 			dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
760 			return wait_modem_info(port, arg);
761 
762 		default:
763 			dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
764 			break;
765 	}
766 
767 	return -ENOIOCTLCMD;
768 }
769 
770 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
771 {
772 	struct usb_serial *serial = port->serial;
773 	u16 state;
774 	int result;
775 
776 	dbg("%s - port %d", __FUNCTION__, port->number);
777 
778 	if (break_state == 0)
779 		state = BREAK_OFF;
780 	else
781 		state = BREAK_ON;
782 	dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
783 
784 	result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
785 				  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
786 				  0, NULL, 0, 100);
787 	if (result)
788 		dbg("%s - error sending break = %d", __FUNCTION__, result);
789 }
790 
791 
792 static void pl2303_shutdown (struct usb_serial *serial)
793 {
794 	int i;
795 	struct pl2303_private *priv;
796 
797 	dbg("%s", __FUNCTION__);
798 
799 	for (i = 0; i < serial->num_ports; ++i) {
800 		priv = usb_get_serial_port_data(serial->port[i]);
801 		if (priv) {
802 			pl2303_buf_free(priv->buf);
803 			kfree(priv);
804 			usb_set_serial_port_data(serial->port[i], NULL);
805 		}
806 	}
807 }
808 
809 static void pl2303_update_line_status(struct usb_serial_port *port,
810 				      unsigned char *data,
811 				      unsigned int actual_length)
812 {
813 
814 	struct pl2303_private *priv = usb_get_serial_port_data(port);
815 	unsigned long flags;
816 	u8 status_idx = UART_STATE;
817 	u8 length = UART_STATE + 1;
818 
819 	if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
820 	    (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
821 	     le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
822 	     le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
823 		length = 1;
824 		status_idx = 0;
825 	}
826 
827 	if (actual_length < length)
828 		goto exit;
829 
830         /* Save off the uart status for others to look at */
831 	spin_lock_irqsave(&priv->lock, flags);
832 	priv->line_status = data[status_idx];
833 	spin_unlock_irqrestore(&priv->lock, flags);
834 	wake_up_interruptible (&priv->delta_msr_wait);
835 
836 exit:
837 	return;
838 }
839 
840 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
841 {
842 	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
843 	unsigned char *data = urb->transfer_buffer;
844 	unsigned int actual_length = urb->actual_length;
845 	int status;
846 
847 	dbg("%s (%d)", __FUNCTION__, port->number);
848 
849 	switch (urb->status) {
850 	case 0:
851 		/* success */
852 		break;
853 	case -ECONNRESET:
854 	case -ENOENT:
855 	case -ESHUTDOWN:
856 		/* this urb is terminated, clean up */
857 		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
858 		return;
859 	default:
860 		dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
861 		goto exit;
862 	}
863 
864 	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
865 	pl2303_update_line_status(port, data, actual_length);
866 
867 exit:
868 	status = usb_submit_urb (urb, GFP_ATOMIC);
869 	if (status)
870 		dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
871 			__FUNCTION__, status);
872 }
873 
874 
875 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
876 {
877 	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
878 	struct pl2303_private *priv = usb_get_serial_port_data(port);
879 	struct tty_struct *tty;
880 	unsigned char *data = urb->transfer_buffer;
881 	unsigned long flags;
882 	int i;
883 	int result;
884 	u8 status;
885 	char tty_flag;
886 
887 	dbg("%s - port %d", __FUNCTION__, port->number);
888 
889 	if (urb->status) {
890 		dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
891 		if (!port->open_count) {
892 			dbg("%s - port is closed, exiting.", __FUNCTION__);
893 			return;
894 		}
895 		if (urb->status == -EPROTO) {
896 			/* PL2303 mysteriously fails with -EPROTO reschedule the read */
897 			dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
898 			urb->status = 0;
899 			urb->dev = port->serial->dev;
900 			result = usb_submit_urb(urb, GFP_ATOMIC);
901 			if (result)
902 				dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
903 			return;
904 		}
905 		dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
906 		return;
907 	}
908 
909 	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
910 
911 	/* get tty_flag from status */
912 	tty_flag = TTY_NORMAL;
913 
914 	spin_lock_irqsave(&priv->lock, flags);
915 	status = priv->line_status;
916 	priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
917 	spin_unlock_irqrestore(&priv->lock, flags);
918 	wake_up_interruptible (&priv->delta_msr_wait);
919 
920 	/* break takes precedence over parity, */
921 	/* which takes precedence over framing errors */
922 	if (status & UART_BREAK_ERROR )
923 		tty_flag = TTY_BREAK;
924 	else if (status & UART_PARITY_ERROR)
925 		tty_flag = TTY_PARITY;
926 	else if (status & UART_FRAME_ERROR)
927 		tty_flag = TTY_FRAME;
928 	dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
929 
930 	tty = port->tty;
931 	if (tty && urb->actual_length) {
932 		tty_buffer_request_room(tty, urb->actual_length + 1);
933 		/* overrun is special, not associated with a char */
934 		if (status & UART_OVERRUN_ERROR)
935 			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
936 		for (i = 0; i < urb->actual_length; ++i)
937 			tty_insert_flip_char (tty, data[i], tty_flag);
938 		tty_flip_buffer_push (tty);
939 	}
940 
941 	/* Schedule the next read _if_ we are still open */
942 	if (port->open_count) {
943 		urb->dev = port->serial->dev;
944 		result = usb_submit_urb(urb, GFP_ATOMIC);
945 		if (result)
946 			dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
947 	}
948 
949 	return;
950 }
951 
952 
953 
954 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
955 {
956 	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
957 	struct pl2303_private *priv = usb_get_serial_port_data(port);
958 	int result;
959 
960 	dbg("%s - port %d", __FUNCTION__, port->number);
961 
962 	switch (urb->status) {
963 	case 0:
964 		/* success */
965 		break;
966 	case -ECONNRESET:
967 	case -ENOENT:
968 	case -ESHUTDOWN:
969 		/* this urb is terminated, clean up */
970 		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
971 		priv->write_urb_in_use = 0;
972 		return;
973 	default:
974 		/* error in the urb, so we have to resubmit it */
975 		dbg("%s - Overflow in write", __FUNCTION__);
976 		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
977 		port->write_urb->transfer_buffer_length = 1;
978 		port->write_urb->dev = port->serial->dev;
979 		result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
980 		if (result)
981 			dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
982 		else
983 			return;
984 	}
985 
986 	priv->write_urb_in_use = 0;
987 
988 	/* send any buffered data */
989 	pl2303_send(port);
990 }
991 
992 
993 /*
994  * pl2303_buf_alloc
995  *
996  * Allocate a circular buffer and all associated memory.
997  */
998 
999 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
1000 {
1001 
1002 	struct pl2303_buf *pb;
1003 
1004 
1005 	if (size == 0)
1006 		return NULL;
1007 
1008 	pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1009 	if (pb == NULL)
1010 		return NULL;
1011 
1012 	pb->buf_buf = kmalloc(size, GFP_KERNEL);
1013 	if (pb->buf_buf == NULL) {
1014 		kfree(pb);
1015 		return NULL;
1016 	}
1017 
1018 	pb->buf_size = size;
1019 	pb->buf_get = pb->buf_put = pb->buf_buf;
1020 
1021 	return pb;
1022 
1023 }
1024 
1025 
1026 /*
1027  * pl2303_buf_free
1028  *
1029  * Free the buffer and all associated memory.
1030  */
1031 
1032 static void pl2303_buf_free(struct pl2303_buf *pb)
1033 {
1034 	if (pb) {
1035 		kfree(pb->buf_buf);
1036 		kfree(pb);
1037 	}
1038 }
1039 
1040 
1041 /*
1042  * pl2303_buf_clear
1043  *
1044  * Clear out all data in the circular buffer.
1045  */
1046 
1047 static void pl2303_buf_clear(struct pl2303_buf *pb)
1048 {
1049 	if (pb != NULL)
1050 		pb->buf_get = pb->buf_put;
1051 		/* equivalent to a get of all data available */
1052 }
1053 
1054 
1055 /*
1056  * pl2303_buf_data_avail
1057  *
1058  * Return the number of bytes of data available in the circular
1059  * buffer.
1060  */
1061 
1062 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1063 {
1064 	if (pb != NULL)
1065 		return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1066 	else
1067 		return 0;
1068 }
1069 
1070 
1071 /*
1072  * pl2303_buf_space_avail
1073  *
1074  * Return the number of bytes of space available in the circular
1075  * buffer.
1076  */
1077 
1078 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1079 {
1080 	if (pb != NULL)
1081 		return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1082 	else
1083 		return 0;
1084 }
1085 
1086 
1087 /*
1088  * pl2303_buf_put
1089  *
1090  * Copy data data from a user buffer and put it into the circular buffer.
1091  * Restrict to the amount of space available.
1092  *
1093  * Return the number of bytes copied.
1094  */
1095 
1096 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1097 	unsigned int count)
1098 {
1099 
1100 	unsigned int len;
1101 
1102 
1103 	if (pb == NULL)
1104 		return 0;
1105 
1106 	len  = pl2303_buf_space_avail(pb);
1107 	if (count > len)
1108 		count = len;
1109 
1110 	if (count == 0)
1111 		return 0;
1112 
1113 	len = pb->buf_buf + pb->buf_size - pb->buf_put;
1114 	if (count > len) {
1115 		memcpy(pb->buf_put, buf, len);
1116 		memcpy(pb->buf_buf, buf+len, count - len);
1117 		pb->buf_put = pb->buf_buf + count - len;
1118 	} else {
1119 		memcpy(pb->buf_put, buf, count);
1120 		if (count < len)
1121 			pb->buf_put += count;
1122 		else /* count == len */
1123 			pb->buf_put = pb->buf_buf;
1124 	}
1125 
1126 	return count;
1127 
1128 }
1129 
1130 
1131 /*
1132  * pl2303_buf_get
1133  *
1134  * Get data from the circular buffer and copy to the given buffer.
1135  * Restrict to the amount of data available.
1136  *
1137  * Return the number of bytes copied.
1138  */
1139 
1140 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1141 	unsigned int count)
1142 {
1143 
1144 	unsigned int len;
1145 
1146 
1147 	if (pb == NULL)
1148 		return 0;
1149 
1150 	len = pl2303_buf_data_avail(pb);
1151 	if (count > len)
1152 		count = len;
1153 
1154 	if (count == 0)
1155 		return 0;
1156 
1157 	len = pb->buf_buf + pb->buf_size - pb->buf_get;
1158 	if (count > len) {
1159 		memcpy(buf, pb->buf_get, len);
1160 		memcpy(buf+len, pb->buf_buf, count - len);
1161 		pb->buf_get = pb->buf_buf + count - len;
1162 	} else {
1163 		memcpy(buf, pb->buf_get, count);
1164 		if (count < len)
1165 			pb->buf_get += count;
1166 		else /* count == len */
1167 			pb->buf_get = pb->buf_buf;
1168 	}
1169 
1170 	return count;
1171 
1172 }
1173 
1174 static int __init pl2303_init (void)
1175 {
1176 	int retval;
1177 	retval = usb_serial_register(&pl2303_device);
1178 	if (retval)
1179 		goto failed_usb_serial_register;
1180 	retval = usb_register(&pl2303_driver);
1181 	if (retval)
1182 		goto failed_usb_register;
1183 	info(DRIVER_DESC);
1184 	return 0;
1185 failed_usb_register:
1186 	usb_serial_deregister(&pl2303_device);
1187 failed_usb_serial_register:
1188 	return retval;
1189 }
1190 
1191 
1192 static void __exit pl2303_exit (void)
1193 {
1194 	usb_deregister (&pl2303_driver);
1195 	usb_serial_deregister (&pl2303_device);
1196 }
1197 
1198 
1199 module_init(pl2303_init);
1200 module_exit(pl2303_exit);
1201 
1202 MODULE_DESCRIPTION(DRIVER_DESC);
1203 MODULE_LICENSE("GPL");
1204 
1205 module_param(debug, bool, S_IRUGO | S_IWUSR);
1206 MODULE_PARM_DESC(debug, "Debug enabled or not");
1207 
1208