2 * Prolific PL2303 USB to serial adaptor driver
4 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2003 IBM Corp.
7 * Original driver for 2.2.x by anonymous
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, or
12 * (at your option) any later version.
14 * See Documentation/usb/usb-serial.txt for more information on using this driver
17 * allowed driver to work properly if there is no tty assigned to a port
18 * (this happens for serial console devices.)
21 * Added RTS and DTR line control. Thanks to joe@bndlg.de for parts of it.
24 * Added break support.
27 * fixed oops in write_bulk_callback.
30 * reworked buffer logic to be like other usb-serial drivers. Hopefully
31 * removing some reported problems.
34 * finished porting to 2.4 format.
38 #include <linux/config.h>
39 #include <linux/kernel.h>
40 #include <linux/errno.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/tty.h>
44 #include <linux/tty_driver.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/module.h>
48 #include <linux/moduleparam.h>
49 #include <linux/spinlock.h>
50 #include <asm/uaccess.h>
51 #include <linux/usb.h>
52 #include "usb-serial.h"
58 #define DRIVER_VERSION "v0.12"
59 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
63 #define PL2303_CLOSING_WAIT (30*HZ)
65 #define PL2303_BUF_SIZE 1024
66 #define PL2303_TMP_BUF_SIZE 1024
68 static DECLARE_MUTEX(pl2303_tmp_buf_sem
);
71 unsigned int buf_size
;
77 static struct usb_device_id id_table
[] = {
78 { USB_DEVICE(PL2303_VENDOR_ID
, PL2303_PRODUCT_ID
) },
79 { USB_DEVICE(PL2303_VENDOR_ID
, PL2303_PRODUCT_ID_RSAQ2
) },
80 { USB_DEVICE(PL2303_VENDOR_ID
, PL2303_PRODUCT_ID_RSAQ3
) },
81 { USB_DEVICE(PL2303_VENDOR_ID
, PL2303_PRODUCT_ID_PHAROS
) },
82 { USB_DEVICE(IODATA_VENDOR_ID
, IODATA_PRODUCT_ID
) },
83 { USB_DEVICE(ATEN_VENDOR_ID
, ATEN_PRODUCT_ID
) },
84 { USB_DEVICE(ATEN_VENDOR_ID2
, ATEN_PRODUCT_ID
) },
85 { USB_DEVICE(ELCOM_VENDOR_ID
, ELCOM_PRODUCT_ID
) },
86 { USB_DEVICE(ELCOM_VENDOR_ID
, ELCOM_PRODUCT_ID_UCSGT
) },
87 { USB_DEVICE(ITEGNO_VENDOR_ID
, ITEGNO_PRODUCT_ID
) },
88 { USB_DEVICE(MA620_VENDOR_ID
, MA620_PRODUCT_ID
) },
89 { USB_DEVICE(RATOC_VENDOR_ID
, RATOC_PRODUCT_ID
) },
90 { USB_DEVICE(TRIPP_VENDOR_ID
, TRIPP_PRODUCT_ID
) },
91 { USB_DEVICE(RADIOSHACK_VENDOR_ID
, RADIOSHACK_PRODUCT_ID
) },
92 { USB_DEVICE(DCU10_VENDOR_ID
, DCU10_PRODUCT_ID
) },
93 { USB_DEVICE(SITECOM_VENDOR_ID
, SITECOM_PRODUCT_ID
) },
94 { USB_DEVICE(ALCATEL_VENDOR_ID
, ALCATEL_PRODUCT_ID
) },
95 { USB_DEVICE(SAMSUNG_VENDOR_ID
, SAMSUNG_PRODUCT_ID
) },
96 { USB_DEVICE(SIEMENS_VENDOR_ID
, SIEMENS_PRODUCT_ID_X65
) },
97 { } /* Terminating entry */
100 MODULE_DEVICE_TABLE (usb
, id_table
);
102 static struct usb_driver pl2303_driver
= {
103 .owner
= THIS_MODULE
,
105 .probe
= usb_serial_probe
,
106 .disconnect
= usb_serial_disconnect
,
107 .id_table
= id_table
,
110 #define SET_LINE_REQUEST_TYPE 0x21
111 #define SET_LINE_REQUEST 0x20
113 #define SET_CONTROL_REQUEST_TYPE 0x21
114 #define SET_CONTROL_REQUEST 0x22
115 #define CONTROL_DTR 0x01
116 #define CONTROL_RTS 0x02
118 #define BREAK_REQUEST_TYPE 0x21
119 #define BREAK_REQUEST 0x23
120 #define BREAK_ON 0xffff
121 #define BREAK_OFF 0x0000
123 #define GET_LINE_REQUEST_TYPE 0xa1
124 #define GET_LINE_REQUEST 0x21
126 #define VENDOR_WRITE_REQUEST_TYPE 0x40
127 #define VENDOR_WRITE_REQUEST 0x01
129 #define VENDOR_READ_REQUEST_TYPE 0xc0
130 #define VENDOR_READ_REQUEST 0x01
132 #define UART_STATE 0x08
133 #define UART_STATE_TRANSIENT_MASK 0x74
134 #define UART_DCD 0x01
135 #define UART_DSR 0x02
136 #define UART_BREAK_ERROR 0x04
137 #define UART_RING 0x08
138 #define UART_FRAME_ERROR 0x10
139 #define UART_PARITY_ERROR 0x20
140 #define UART_OVERRUN_ERROR 0x40
141 #define UART_CTS 0x80
143 /* function prototypes for a PL2303 serial converter */
144 static int pl2303_open (struct usb_serial_port
*port
, struct file
*filp
);
145 static void pl2303_close (struct usb_serial_port
*port
, struct file
*filp
);
146 static void pl2303_set_termios (struct usb_serial_port
*port
,
147 struct termios
*old
);
148 static int pl2303_ioctl (struct usb_serial_port
*port
, struct file
*file
,
149 unsigned int cmd
, unsigned long arg
);
150 static void pl2303_read_int_callback (struct urb
*urb
, struct pt_regs
*regs
);
151 static void pl2303_read_bulk_callback (struct urb
*urb
, struct pt_regs
*regs
);
152 static void pl2303_write_bulk_callback (struct urb
*urb
, struct pt_regs
*regs
);
153 static int pl2303_write (struct usb_serial_port
*port
,
154 const unsigned char *buf
, int count
);
155 static void pl2303_send (struct usb_serial_port
*port
);
156 static int pl2303_write_room(struct usb_serial_port
*port
);
157 static int pl2303_chars_in_buffer(struct usb_serial_port
*port
);
158 static void pl2303_break_ctl(struct usb_serial_port
*port
,int break_state
);
159 static int pl2303_tiocmget (struct usb_serial_port
*port
, struct file
*file
);
160 static int pl2303_tiocmset (struct usb_serial_port
*port
, struct file
*file
,
161 unsigned int set
, unsigned int clear
);
162 static int pl2303_startup (struct usb_serial
*serial
);
163 static void pl2303_shutdown (struct usb_serial
*serial
);
164 static struct pl2303_buf
*pl2303_buf_alloc(unsigned int size
);
165 static void pl2303_buf_free(struct pl2303_buf
*pb
);
166 static void pl2303_buf_clear(struct pl2303_buf
*pb
);
167 static unsigned int pl2303_buf_data_avail(struct pl2303_buf
*pb
);
168 static unsigned int pl2303_buf_space_avail(struct pl2303_buf
*pb
);
169 static unsigned int pl2303_buf_put(struct pl2303_buf
*pb
, const char *buf
,
171 static unsigned int pl2303_buf_get(struct pl2303_buf
*pb
, char *buf
,
175 /* All of the device info needed for the PL2303 SIO serial converter */
176 static struct usb_serial_device_type pl2303_device
= {
177 .owner
= THIS_MODULE
,
179 .id_table
= id_table
,
180 .num_interrupt_in
= NUM_DONT_CARE
,
185 .close
= pl2303_close
,
186 .write
= pl2303_write
,
187 .ioctl
= pl2303_ioctl
,
188 .break_ctl
= pl2303_break_ctl
,
189 .set_termios
= pl2303_set_termios
,
190 .tiocmget
= pl2303_tiocmget
,
191 .tiocmset
= pl2303_tiocmset
,
192 .read_bulk_callback
= pl2303_read_bulk_callback
,
193 .read_int_callback
= pl2303_read_int_callback
,
194 .write_bulk_callback
= pl2303_write_bulk_callback
,
195 .write_room
= pl2303_write_room
,
196 .chars_in_buffer
= pl2303_chars_in_buffer
,
197 .attach
= pl2303_startup
,
198 .shutdown
= pl2303_shutdown
,
202 type_0
, /* don't know the difference between type 0 and */
203 type_1
, /* type 1, until someone from prolific tells us... */
204 HX
, /* HX version of the pl2303 chip */
207 struct pl2303_private
{
209 struct pl2303_buf
*buf
;
210 int write_urb_in_use
;
211 wait_queue_head_t delta_msr_wait
;
214 u8 termios_initialized
;
215 enum pl2303_type type
;
219 static int pl2303_startup (struct usb_serial
*serial
)
221 struct pl2303_private
*priv
;
222 enum pl2303_type type
= type_0
;
225 if (serial
->dev
->descriptor
.bDeviceClass
== 0x02)
227 else if (serial
->dev
->descriptor
.bMaxPacketSize0
== 0x40)
229 else if (serial
->dev
->descriptor
.bDeviceClass
== 0x00)
231 else if (serial
->dev
->descriptor
.bDeviceClass
== 0xFF)
233 dbg("device type: %d", type
);
235 for (i
= 0; i
< serial
->num_ports
; ++i
) {
236 priv
= kmalloc (sizeof (struct pl2303_private
), GFP_KERNEL
);
239 memset (priv
, 0x00, sizeof (struct pl2303_private
));
240 spin_lock_init(&priv
->lock
);
241 priv
->buf
= pl2303_buf_alloc(PL2303_BUF_SIZE
);
242 if (priv
->buf
== NULL
) {
246 init_waitqueue_head(&priv
->delta_msr_wait
);
248 usb_set_serial_port_data(serial
->port
[i
], priv
);
253 for (--i
; i
>=0; --i
) {
254 priv
= usb_get_serial_port_data(serial
->port
[i
]);
255 pl2303_buf_free(priv
->buf
);
257 usb_set_serial_port_data(serial
->port
[i
], NULL
);
262 static int set_control_lines (struct usb_device
*dev
, u8 value
)
266 retval
= usb_control_msg (dev
, usb_sndctrlpipe (dev
, 0),
267 SET_CONTROL_REQUEST
, SET_CONTROL_REQUEST_TYPE
,
268 value
, 0, NULL
, 0, 100);
269 dbg("%s - value = %d, retval = %d", __FUNCTION__
, value
, retval
);
273 static int pl2303_write (struct usb_serial_port
*port
, const unsigned char *buf
, int count
)
275 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
278 dbg("%s - port %d, %d bytes", __FUNCTION__
, port
->number
, count
);
283 spin_lock_irqsave(&priv
->lock
, flags
);
284 count
= pl2303_buf_put(priv
->buf
, buf
, count
);
285 spin_unlock_irqrestore(&priv
->lock
, flags
);
292 static void pl2303_send(struct usb_serial_port
*port
)
295 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
298 dbg("%s - port %d", __FUNCTION__
, port
->number
);
300 spin_lock_irqsave(&priv
->lock
, flags
);
302 if (priv
->write_urb_in_use
) {
303 spin_unlock_irqrestore(&priv
->lock
, flags
);
307 count
= pl2303_buf_get(priv
->buf
, port
->write_urb
->transfer_buffer
,
308 port
->bulk_out_size
);
311 spin_unlock_irqrestore(&priv
->lock
, flags
);
315 priv
->write_urb_in_use
= 1;
317 spin_unlock_irqrestore(&priv
->lock
, flags
);
319 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, count
, port
->write_urb
->transfer_buffer
);
321 port
->write_urb
->transfer_buffer_length
= count
;
322 port
->write_urb
->dev
= port
->serial
->dev
;
323 result
= usb_submit_urb (port
->write_urb
, GFP_ATOMIC
);
325 dev_err(&port
->dev
, "%s - failed submitting write urb, error %d\n", __FUNCTION__
, result
);
326 priv
->write_urb_in_use
= 0;
327 // TODO: reschedule pl2303_send
330 schedule_work(&port
->work
);
333 static int pl2303_write_room(struct usb_serial_port
*port
)
335 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
339 dbg("%s - port %d", __FUNCTION__
, port
->number
);
341 spin_lock_irqsave(&priv
->lock
, flags
);
342 room
= pl2303_buf_space_avail(priv
->buf
);
343 spin_unlock_irqrestore(&priv
->lock
, flags
);
345 dbg("%s - returns %d", __FUNCTION__
, room
);
349 static int pl2303_chars_in_buffer(struct usb_serial_port
*port
)
351 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
355 dbg("%s - port %d", __FUNCTION__
, port
->number
);
357 spin_lock_irqsave(&priv
->lock
, flags
);
358 chars
= pl2303_buf_data_avail(priv
->buf
);
359 spin_unlock_irqrestore(&priv
->lock
, flags
);
361 dbg("%s - returns %d", __FUNCTION__
, chars
);
365 static void pl2303_set_termios (struct usb_serial_port
*port
, struct termios
*old_termios
)
367 struct usb_serial
*serial
= port
->serial
;
368 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
376 dbg("%s - port %d", __FUNCTION__
, port
->number
);
378 if ((!port
->tty
) || (!port
->tty
->termios
)) {
379 dbg("%s - no tty structures", __FUNCTION__
);
383 spin_lock_irqsave(&priv
->lock
, flags
);
384 if (!priv
->termios_initialized
) {
385 *(port
->tty
->termios
) = tty_std_termios
;
386 port
->tty
->termios
->c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
387 priv
->termios_initialized
= 1;
389 spin_unlock_irqrestore(&priv
->lock
, flags
);
391 cflag
= port
->tty
->termios
->c_cflag
;
392 /* check that they really want us to change something */
394 if ((cflag
== old_termios
->c_cflag
) &&
395 (RELEVANT_IFLAG(port
->tty
->termios
->c_iflag
) == RELEVANT_IFLAG(old_termios
->c_iflag
))) {
396 dbg("%s - nothing to change...", __FUNCTION__
);
401 buf
= kmalloc (7, GFP_KERNEL
);
403 dev_err(&port
->dev
, "%s - out of memory.\n", __FUNCTION__
);
406 memset (buf
, 0x00, 0x07);
408 i
= usb_control_msg (serial
->dev
, usb_rcvctrlpipe (serial
->dev
, 0),
409 GET_LINE_REQUEST
, GET_LINE_REQUEST_TYPE
,
411 dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i
,
412 buf
[0], buf
[1], buf
[2], buf
[3], buf
[4], buf
[5], buf
[6]);
416 switch (cflag
& CSIZE
) {
417 case CS5
: buf
[6] = 5; break;
418 case CS6
: buf
[6] = 6; break;
419 case CS7
: buf
[6] = 7; break;
421 case CS8
: buf
[6] = 8; break;
423 dbg("%s - data bits = %d", __FUNCTION__
, buf
[6]);
427 switch (cflag
& CBAUD
) {
428 case B0
: baud
= 0; break;
429 case B75
: baud
= 75; break;
430 case B150
: baud
= 150; break;
431 case B300
: baud
= 300; break;
432 case B600
: baud
= 600; break;
433 case B1200
: baud
= 1200; break;
434 case B1800
: baud
= 1800; break;
435 case B2400
: baud
= 2400; break;
436 case B4800
: baud
= 4800; break;
437 case B9600
: baud
= 9600; break;
438 case B19200
: baud
= 19200; break;
439 case B38400
: baud
= 38400; break;
440 case B57600
: baud
= 57600; break;
441 case B115200
: baud
= 115200; break;
442 case B230400
: baud
= 230400; break;
443 case B460800
: baud
= 460800; break;
445 dev_err(&port
->dev
, "pl2303 driver does not support the baudrate requested (fix it)\n");
448 dbg("%s - baud = %d", __FUNCTION__
, baud
);
450 buf
[0] = baud
& 0xff;
451 buf
[1] = (baud
>> 8) & 0xff;
452 buf
[2] = (baud
>> 16) & 0xff;
453 buf
[3] = (baud
>> 24) & 0xff;
456 /* For reference buf[4]=0 is 1 stop bits */
457 /* For reference buf[4]=1 is 1.5 stop bits */
458 /* For reference buf[4]=2 is 2 stop bits */
459 if (cflag
& CSTOPB
) {
461 dbg("%s - stop bits = 2", __FUNCTION__
);
464 dbg("%s - stop bits = 1", __FUNCTION__
);
467 if (cflag
& PARENB
) {
468 /* For reference buf[5]=0 is none parity */
469 /* For reference buf[5]=1 is odd parity */
470 /* For reference buf[5]=2 is even parity */
471 /* For reference buf[5]=3 is mark parity */
472 /* For reference buf[5]=4 is space parity */
473 if (cflag
& PARODD
) {
475 dbg("%s - parity = odd", __FUNCTION__
);
478 dbg("%s - parity = even", __FUNCTION__
);
482 dbg("%s - parity = none", __FUNCTION__
);
485 i
= usb_control_msg (serial
->dev
, usb_sndctrlpipe (serial
->dev
, 0),
486 SET_LINE_REQUEST
, SET_LINE_REQUEST_TYPE
,
488 dbg ("0x21:0x20:0:0 %d", i
);
490 /* change control lines if we are switching to or from B0 */
491 spin_lock_irqsave(&priv
->lock
, flags
);
492 control
= priv
->line_control
;
493 if ((cflag
& CBAUD
) == B0
)
494 priv
->line_control
&= ~(CONTROL_DTR
| CONTROL_RTS
);
496 priv
->line_control
|= (CONTROL_DTR
| CONTROL_RTS
);
497 if (control
!= priv
->line_control
) {
498 control
= priv
->line_control
;
499 spin_unlock_irqrestore(&priv
->lock
, flags
);
500 set_control_lines(serial
->dev
, control
);
502 spin_unlock_irqrestore(&priv
->lock
, flags
);
505 buf
[0] = buf
[1] = buf
[2] = buf
[3] = buf
[4] = buf
[5] = buf
[6] = 0;
507 i
= usb_control_msg (serial
->dev
, usb_rcvctrlpipe (serial
->dev
, 0),
508 GET_LINE_REQUEST
, GET_LINE_REQUEST_TYPE
,
510 dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i
,
511 buf
[0], buf
[1], buf
[2], buf
[3], buf
[4], buf
[5], buf
[6]);
513 if (cflag
& CRTSCTS
) {
515 if (priv
->type
== HX
)
519 i
= usb_control_msg(serial
->dev
,
520 usb_sndctrlpipe(serial
->dev
, 0),
521 VENDOR_WRITE_REQUEST
,
522 VENDOR_WRITE_REQUEST_TYPE
,
523 0x0, index
, NULL
, 0, 100);
524 dbg ("0x40:0x1:0x0:0x%x %d", index
, i
);
530 static int pl2303_open (struct usb_serial_port
*port
, struct file
*filp
)
532 struct termios tmp_termios
;
533 struct usb_serial
*serial
= port
->serial
;
534 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
538 dbg("%s - port %d", __FUNCTION__
, port
->number
);
540 usb_clear_halt(serial
->dev
, port
->write_urb
->pipe
);
541 usb_clear_halt(serial
->dev
, port
->read_urb
->pipe
);
543 buf
= kmalloc(10, GFP_KERNEL
);
547 #define FISH(a,b,c,d) \
548 result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
549 b, a, c, d, buf, 1, 100); \
550 dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
552 #define SOUP(a,b,c,d) \
553 result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \
554 b, a, c, d, NULL, 0, 100); \
555 dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
557 FISH (VENDOR_READ_REQUEST_TYPE
, VENDOR_READ_REQUEST
, 0x8484, 0);
558 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 0x0404, 0);
559 FISH (VENDOR_READ_REQUEST_TYPE
, VENDOR_READ_REQUEST
, 0x8484, 0);
560 FISH (VENDOR_READ_REQUEST_TYPE
, VENDOR_READ_REQUEST
, 0x8383, 0);
561 FISH (VENDOR_READ_REQUEST_TYPE
, VENDOR_READ_REQUEST
, 0x8484, 0);
562 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 0x0404, 1);
563 FISH (VENDOR_READ_REQUEST_TYPE
, VENDOR_READ_REQUEST
, 0x8484, 0);
564 FISH (VENDOR_READ_REQUEST_TYPE
, VENDOR_READ_REQUEST
, 0x8383, 0);
565 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 0, 1);
566 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 1, 0);
568 if (priv
->type
== HX
) {
570 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 2, 0x44);
571 /* reset upstream data pipes */
572 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 8, 0);
573 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 9, 0);
575 SOUP (VENDOR_WRITE_REQUEST_TYPE
, VENDOR_WRITE_REQUEST
, 2, 0x24);
582 pl2303_set_termios (port
, &tmp_termios
);
585 //FIXME: need to assert RTS and DTR if CRTSCTS off
587 dbg("%s - submitting read urb", __FUNCTION__
);
588 port
->read_urb
->dev
= serial
->dev
;
589 result
= usb_submit_urb (port
->read_urb
, GFP_KERNEL
);
591 dev_err(&port
->dev
, "%s - failed submitting read urb, error %d\n", __FUNCTION__
, result
);
592 pl2303_close (port
, NULL
);
596 dbg("%s - submitting interrupt urb", __FUNCTION__
);
597 port
->interrupt_in_urb
->dev
= serial
->dev
;
598 result
= usb_submit_urb (port
->interrupt_in_urb
, GFP_KERNEL
);
600 dev_err(&port
->dev
, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__
, result
);
601 pl2303_close (port
, NULL
);
608 static void pl2303_close (struct usb_serial_port
*port
, struct file
*filp
)
610 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
612 unsigned int c_cflag
;
617 dbg("%s - port %d", __FUNCTION__
, port
->number
);
619 /* wait for data to drain from the buffer */
620 spin_lock_irqsave(&priv
->lock
, flags
);
621 timeout
= PL2303_CLOSING_WAIT
;
622 init_waitqueue_entry(&wait
, current
);
623 add_wait_queue(&port
->tty
->write_wait
, &wait
);
625 set_current_state(TASK_INTERRUPTIBLE
);
626 if (pl2303_buf_data_avail(priv
->buf
) == 0
627 || timeout
== 0 || signal_pending(current
)
628 || !usb_get_intfdata(port
->serial
->interface
)) /* disconnect */
630 spin_unlock_irqrestore(&priv
->lock
, flags
);
631 timeout
= schedule_timeout(timeout
);
632 spin_lock_irqsave(&priv
->lock
, flags
);
634 set_current_state(TASK_RUNNING
);
635 remove_wait_queue(&port
->tty
->write_wait
, &wait
);
636 /* clear out any remaining data in the buffer */
637 pl2303_buf_clear(priv
->buf
);
638 spin_unlock_irqrestore(&priv
->lock
, flags
);
640 /* wait for characters to drain from the device */
641 /* (this is long enough for the entire 256 byte */
642 /* pl2303 hardware buffer to drain with no flow */
643 /* control for data rates of 1200 bps or more, */
644 /* for lower rates we should really know how much */
645 /* data is in the buffer to compute a delay */
646 /* that is not unnecessarily long) */
647 bps
= tty_get_baud_rate(port
->tty
);
649 timeout
= max((HZ
*2560)/bps
,HZ
/10);
652 set_current_state(TASK_INTERRUPTIBLE
);
653 schedule_timeout(timeout
);
655 /* shutdown our urbs */
656 dbg("%s - shutting down urbs", __FUNCTION__
);
657 usb_kill_urb(port
->write_urb
);
658 usb_kill_urb(port
->read_urb
);
659 usb_kill_urb(port
->interrupt_in_urb
);
662 c_cflag
= port
->tty
->termios
->c_cflag
;
663 if (c_cflag
& HUPCL
) {
664 /* drop DTR and RTS */
665 spin_lock_irqsave(&priv
->lock
, flags
);
666 priv
->line_control
= 0;
667 spin_unlock_irqrestore (&priv
->lock
, flags
);
668 set_control_lines (port
->serial
->dev
, 0);
673 static int pl2303_tiocmset (struct usb_serial_port
*port
, struct file
*file
,
674 unsigned int set
, unsigned int clear
)
676 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
680 spin_lock_irqsave (&priv
->lock
, flags
);
682 priv
->line_control
|= CONTROL_RTS
;
684 priv
->line_control
|= CONTROL_DTR
;
685 if (clear
& TIOCM_RTS
)
686 priv
->line_control
&= ~CONTROL_RTS
;
687 if (clear
& TIOCM_DTR
)
688 priv
->line_control
&= ~CONTROL_DTR
;
689 control
= priv
->line_control
;
690 spin_unlock_irqrestore (&priv
->lock
, flags
);
692 return set_control_lines (port
->serial
->dev
, control
);
695 static int pl2303_tiocmget (struct usb_serial_port
*port
, struct file
*file
)
697 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
703 dbg("%s (%d)", __FUNCTION__
, port
->number
);
705 spin_lock_irqsave (&priv
->lock
, flags
);
706 mcr
= priv
->line_control
;
707 status
= priv
->line_status
;
708 spin_unlock_irqrestore (&priv
->lock
, flags
);
710 result
= ((mcr
& CONTROL_DTR
) ? TIOCM_DTR
: 0)
711 | ((mcr
& CONTROL_RTS
) ? TIOCM_RTS
: 0)
712 | ((status
& UART_CTS
) ? TIOCM_CTS
: 0)
713 | ((status
& UART_DSR
) ? TIOCM_DSR
: 0)
714 | ((status
& UART_RING
) ? TIOCM_RI
: 0)
715 | ((status
& UART_DCD
) ? TIOCM_CD
: 0);
717 dbg("%s - result = %x", __FUNCTION__
, result
);
722 static int wait_modem_info(struct usb_serial_port
*port
, unsigned int arg
)
724 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
726 unsigned int prevstatus
;
728 unsigned int changed
;
730 spin_lock_irqsave (&priv
->lock
, flags
);
731 prevstatus
= priv
->line_status
;
732 spin_unlock_irqrestore (&priv
->lock
, flags
);
735 interruptible_sleep_on(&priv
->delta_msr_wait
);
736 /* see if a signal did it */
737 if (signal_pending(current
))
740 spin_lock_irqsave (&priv
->lock
, flags
);
741 status
= priv
->line_status
;
742 spin_unlock_irqrestore (&priv
->lock
, flags
);
744 changed
=prevstatus
^status
;
746 if (((arg
& TIOCM_RNG
) && (changed
& UART_RING
)) ||
747 ((arg
& TIOCM_DSR
) && (changed
& UART_DSR
)) ||
748 ((arg
& TIOCM_CD
) && (changed
& UART_DCD
)) ||
749 ((arg
& TIOCM_CTS
) && (changed
& UART_CTS
)) ) {
758 static int pl2303_ioctl (struct usb_serial_port
*port
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
760 dbg("%s (%d) cmd = 0x%04x", __FUNCTION__
, port
->number
, cmd
);
764 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__
, port
->number
);
765 return wait_modem_info(port
, arg
);
768 dbg("%s not supported = 0x%04x", __FUNCTION__
, cmd
);
775 static void pl2303_break_ctl (struct usb_serial_port
*port
, int break_state
)
777 struct usb_serial
*serial
= port
->serial
;
781 dbg("%s - port %d", __FUNCTION__
, port
->number
);
783 if (break_state
== 0)
787 dbg("%s - turning break %s", __FUNCTION__
, state
==BREAK_OFF
? "off" : "on");
789 result
= usb_control_msg (serial
->dev
, usb_sndctrlpipe (serial
->dev
, 0),
790 BREAK_REQUEST
, BREAK_REQUEST_TYPE
, state
,
793 dbg("%s - error sending break = %d", __FUNCTION__
, result
);
797 static void pl2303_shutdown (struct usb_serial
*serial
)
800 struct pl2303_private
*priv
;
802 dbg("%s", __FUNCTION__
);
804 for (i
= 0; i
< serial
->num_ports
; ++i
) {
805 priv
= usb_get_serial_port_data(serial
->port
[i
]);
807 pl2303_buf_free(priv
->buf
);
809 usb_set_serial_port_data(serial
->port
[i
], NULL
);
815 static void pl2303_read_int_callback (struct urb
*urb
, struct pt_regs
*regs
)
817 struct usb_serial_port
*port
= (struct usb_serial_port
*) urb
->context
;
818 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
819 unsigned char *data
= urb
->transfer_buffer
;
824 dbg("%s (%d)", __FUNCTION__
, port
->number
);
826 switch (urb
->status
) {
833 /* this urb is terminated, clean up */
834 dbg("%s - urb shutting down with status: %d", __FUNCTION__
, urb
->status
);
837 dbg("%s - nonzero urb status received: %d", __FUNCTION__
, urb
->status
);
842 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, urb
->actual_length
, urb
->transfer_buffer
);
844 if (urb
->actual_length
< UART_STATE
)
847 /* Save off the uart status for others to look at */
848 uart_state
= data
[UART_STATE
];
849 spin_lock_irqsave(&priv
->lock
, flags
);
850 uart_state
|= (priv
->line_status
& UART_STATE_TRANSIENT_MASK
);
851 priv
->line_status
= uart_state
;
852 spin_unlock_irqrestore(&priv
->lock
, flags
);
855 status
= usb_submit_urb (urb
, GFP_ATOMIC
);
857 dev_err(&urb
->dev
->dev
, "%s - usb_submit_urb failed with result %d\n",
858 __FUNCTION__
, status
);
862 static void pl2303_read_bulk_callback (struct urb
*urb
, struct pt_regs
*regs
)
864 struct usb_serial_port
*port
= (struct usb_serial_port
*) urb
->context
;
865 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
866 struct tty_struct
*tty
;
867 unsigned char *data
= urb
->transfer_buffer
;
874 dbg("%s - port %d", __FUNCTION__
, port
->number
);
877 dbg("%s - urb->status = %d", __FUNCTION__
, urb
->status
);
878 if (!port
->open_count
) {
879 dbg("%s - port is closed, exiting.", __FUNCTION__
);
882 if (urb
->status
== -EPROTO
) {
883 /* PL2303 mysteriously fails with -EPROTO reschedule the read */
884 dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__
);
886 urb
->dev
= port
->serial
->dev
;
887 result
= usb_submit_urb(urb
, GFP_ATOMIC
);
889 dev_err(&urb
->dev
->dev
, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__
, result
);
892 dbg("%s - unable to handle the error, exiting.", __FUNCTION__
);
896 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, urb
->actual_length
, data
);
898 /* get tty_flag from status */
899 tty_flag
= TTY_NORMAL
;
901 spin_lock_irqsave(&priv
->lock
, flags
);
902 status
= priv
->line_status
;
903 priv
->line_status
&= ~UART_STATE_TRANSIENT_MASK
;
904 spin_unlock_irqrestore(&priv
->lock
, flags
);
905 wake_up_interruptible (&priv
->delta_msr_wait
);
907 /* break takes precedence over parity, */
908 /* which takes precedence over framing errors */
909 if (status
& UART_BREAK_ERROR
)
910 tty_flag
= TTY_BREAK
;
911 else if (status
& UART_PARITY_ERROR
)
912 tty_flag
= TTY_PARITY
;
913 else if (status
& UART_FRAME_ERROR
)
914 tty_flag
= TTY_FRAME
;
915 dbg("%s - tty_flag = %d", __FUNCTION__
, tty_flag
);
918 if (tty
&& urb
->actual_length
) {
919 /* overrun is special, not associated with a char */
920 if (status
& UART_OVERRUN_ERROR
)
921 tty_insert_flip_char(tty
, 0, TTY_OVERRUN
);
923 for (i
= 0; i
< urb
->actual_length
; ++i
) {
924 if (tty
->flip
.count
>= TTY_FLIPBUF_SIZE
) {
925 tty_flip_buffer_push(tty
);
927 tty_insert_flip_char (tty
, data
[i
], tty_flag
);
929 tty_flip_buffer_push (tty
);
932 /* Schedule the next read _if_ we are still open */
933 if (port
->open_count
) {
934 urb
->dev
= port
->serial
->dev
;
935 result
= usb_submit_urb(urb
, GFP_ATOMIC
);
937 dev_err(&urb
->dev
->dev
, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__
, result
);
945 static void pl2303_write_bulk_callback (struct urb
*urb
, struct pt_regs
*regs
)
947 struct usb_serial_port
*port
= (struct usb_serial_port
*) urb
->context
;
948 struct pl2303_private
*priv
= usb_get_serial_port_data(port
);
951 dbg("%s - port %d", __FUNCTION__
, port
->number
);
953 switch (urb
->status
) {
960 /* this urb is terminated, clean up */
961 dbg("%s - urb shutting down with status: %d", __FUNCTION__
, urb
->status
);
962 priv
->write_urb_in_use
= 0;
965 /* error in the urb, so we have to resubmit it */
966 dbg("%s - Overflow in write", __FUNCTION__
);
967 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__
, urb
->status
);
968 port
->write_urb
->transfer_buffer_length
= 1;
969 port
->write_urb
->dev
= port
->serial
->dev
;
970 result
= usb_submit_urb (port
->write_urb
, GFP_ATOMIC
);
972 dev_err(&urb
->dev
->dev
, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__
, result
);
977 priv
->write_urb_in_use
= 0;
979 /* send any buffered data */
987 * Allocate a circular buffer and all associated memory.
990 static struct pl2303_buf
*pl2303_buf_alloc(unsigned int size
)
993 struct pl2303_buf
*pb
;
999 pb
= (struct pl2303_buf
*)kmalloc(sizeof(struct pl2303_buf
), GFP_KERNEL
);
1003 pb
->buf_buf
= kmalloc(size
, GFP_KERNEL
);
1004 if (pb
->buf_buf
== NULL
) {
1009 pb
->buf_size
= size
;
1010 pb
->buf_get
= pb
->buf_put
= pb
->buf_buf
;
1020 * Free the buffer and all associated memory.
1023 static void pl2303_buf_free(struct pl2303_buf
*pb
)
1026 if (pb
->buf_buf
!= NULL
)
1036 * Clear out all data in the circular buffer.
1039 static void pl2303_buf_clear(struct pl2303_buf
*pb
)
1042 pb
->buf_get
= pb
->buf_put
;
1043 /* equivalent to a get of all data available */
1048 * pl2303_buf_data_avail
1050 * Return the number of bytes of data available in the circular
1054 static unsigned int pl2303_buf_data_avail(struct pl2303_buf
*pb
)
1057 return ((pb
->buf_size
+ pb
->buf_put
- pb
->buf_get
) % pb
->buf_size
);
1064 * pl2303_buf_space_avail
1066 * Return the number of bytes of space available in the circular
1070 static unsigned int pl2303_buf_space_avail(struct pl2303_buf
*pb
)
1073 return ((pb
->buf_size
+ pb
->buf_get
- pb
->buf_put
- 1) % pb
->buf_size
);
1082 * Copy data data from a user buffer and put it into the circular buffer.
1083 * Restrict to the amount of space available.
1085 * Return the number of bytes copied.
1088 static unsigned int pl2303_buf_put(struct pl2303_buf
*pb
, const char *buf
,
1098 len
= pl2303_buf_space_avail(pb
);
1105 len
= pb
->buf_buf
+ pb
->buf_size
- pb
->buf_put
;
1107 memcpy(pb
->buf_put
, buf
, len
);
1108 memcpy(pb
->buf_buf
, buf
+len
, count
- len
);
1109 pb
->buf_put
= pb
->buf_buf
+ count
- len
;
1111 memcpy(pb
->buf_put
, buf
, count
);
1113 pb
->buf_put
+= count
;
1114 else /* count == len */
1115 pb
->buf_put
= pb
->buf_buf
;
1126 * Get data from the circular buffer and copy to the given buffer.
1127 * Restrict to the amount of data available.
1129 * Return the number of bytes copied.
1132 static unsigned int pl2303_buf_get(struct pl2303_buf
*pb
, char *buf
,
1142 len
= pl2303_buf_data_avail(pb
);
1149 len
= pb
->buf_buf
+ pb
->buf_size
- pb
->buf_get
;
1151 memcpy(buf
, pb
->buf_get
, len
);
1152 memcpy(buf
+len
, pb
->buf_buf
, count
- len
);
1153 pb
->buf_get
= pb
->buf_buf
+ count
- len
;
1155 memcpy(buf
, pb
->buf_get
, count
);
1157 pb
->buf_get
+= count
;
1158 else /* count == len */
1159 pb
->buf_get
= pb
->buf_buf
;
1166 static int __init
pl2303_init (void)
1169 retval
= usb_serial_register(&pl2303_device
);
1171 goto failed_usb_serial_register
;
1172 retval
= usb_register(&pl2303_driver
);
1174 goto failed_usb_register
;
1175 info(DRIVER_DESC
" " DRIVER_VERSION
);
1177 failed_usb_register
:
1178 usb_serial_deregister(&pl2303_device
);
1179 failed_usb_serial_register
:
1184 static void __exit
pl2303_exit (void)
1186 usb_deregister (&pl2303_driver
);
1187 usb_serial_deregister (&pl2303_device
);
1191 module_init(pl2303_init
);
1192 module_exit(pl2303_exit
);
1194 MODULE_DESCRIPTION(DRIVER_DESC
);
1195 MODULE_VERSION(DRIVER_VERSION
);
1196 MODULE_LICENSE("GPL");
1198 module_param(debug
, bool, S_IRUGO
| S_IWUSR
);
1199 MODULE_PARM_DESC(debug
, "Debug enabled or not");