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1da177e4 LT |
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 | |
502b95c1 | 11 | * the Free Software Foundation; either version 2 of the License. |
1da177e4 LT |
12 | * |
13 | * See Documentation/usb/usb-serial.txt for more information on using this driver | |
14 | * | |
1da177e4 LT |
15 | */ |
16 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/tty.h> | |
23 | #include <linux/tty_driver.h> | |
24 | #include <linux/tty_flip.h> | |
25 | #include <linux/serial.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/moduleparam.h> | |
28 | #include <linux/spinlock.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <linux/usb.h> | |
31 | #include "usb-serial.h" | |
32 | #include "pl2303.h" | |
33 | ||
34 | /* | |
35 | * Version Information | |
36 | */ | |
1da177e4 LT |
37 | #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver" |
38 | ||
39 | static int debug; | |
40 | ||
41 | #define PL2303_CLOSING_WAIT (30*HZ) | |
42 | ||
43 | #define PL2303_BUF_SIZE 1024 | |
44 | #define PL2303_TMP_BUF_SIZE 1024 | |
45 | ||
46 | static DECLARE_MUTEX(pl2303_tmp_buf_sem); | |
47 | ||
48 | struct pl2303_buf { | |
49 | unsigned int buf_size; | |
50 | char *buf_buf; | |
51 | char *buf_get; | |
52 | char *buf_put; | |
53 | }; | |
54 | ||
55 | static struct usb_device_id id_table [] = { | |
56 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) }, | |
57 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) }, | |
58 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) }, | |
59 | { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) }, | |
60 | { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, | |
61 | { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) }, | |
62 | { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, | |
63 | { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, | |
64 | { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, | |
65 | { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, | |
66 | { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, | |
67 | { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, | |
68 | { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, | |
69 | { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, | |
70 | { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, | |
71 | { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, | |
72 | { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, | |
73 | { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) }, | |
a8310f3b | 74 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) }, |
1da177e4 | 75 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) }, |
a8310f3b | 76 | { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) }, |
acbb36f1 | 77 | { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) }, |
68e110a0 | 78 | { USB_DEVICE( NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID ) }, |
1da177e4 LT |
79 | { } /* Terminating entry */ |
80 | }; | |
81 | ||
82 | MODULE_DEVICE_TABLE (usb, id_table); | |
83 | ||
84 | static struct usb_driver pl2303_driver = { | |
1da177e4 LT |
85 | .name = "pl2303", |
86 | .probe = usb_serial_probe, | |
87 | .disconnect = usb_serial_disconnect, | |
88 | .id_table = id_table, | |
ba9dc657 | 89 | .no_dynamic_id = 1, |
1da177e4 LT |
90 | }; |
91 | ||
92 | #define SET_LINE_REQUEST_TYPE 0x21 | |
93 | #define SET_LINE_REQUEST 0x20 | |
94 | ||
95 | #define SET_CONTROL_REQUEST_TYPE 0x21 | |
96 | #define SET_CONTROL_REQUEST 0x22 | |
97 | #define CONTROL_DTR 0x01 | |
98 | #define CONTROL_RTS 0x02 | |
99 | ||
100 | #define BREAK_REQUEST_TYPE 0x21 | |
101 | #define BREAK_REQUEST 0x23 | |
102 | #define BREAK_ON 0xffff | |
103 | #define BREAK_OFF 0x0000 | |
104 | ||
105 | #define GET_LINE_REQUEST_TYPE 0xa1 | |
106 | #define GET_LINE_REQUEST 0x21 | |
107 | ||
108 | #define VENDOR_WRITE_REQUEST_TYPE 0x40 | |
109 | #define VENDOR_WRITE_REQUEST 0x01 | |
110 | ||
111 | #define VENDOR_READ_REQUEST_TYPE 0xc0 | |
112 | #define VENDOR_READ_REQUEST 0x01 | |
113 | ||
114 | #define UART_STATE 0x08 | |
115 | #define UART_STATE_TRANSIENT_MASK 0x74 | |
116 | #define UART_DCD 0x01 | |
117 | #define UART_DSR 0x02 | |
118 | #define UART_BREAK_ERROR 0x04 | |
119 | #define UART_RING 0x08 | |
120 | #define UART_FRAME_ERROR 0x10 | |
121 | #define UART_PARITY_ERROR 0x20 | |
122 | #define UART_OVERRUN_ERROR 0x40 | |
123 | #define UART_CTS 0x80 | |
124 | ||
125 | /* function prototypes for a PL2303 serial converter */ | |
126 | static int pl2303_open (struct usb_serial_port *port, struct file *filp); | |
127 | static void pl2303_close (struct usb_serial_port *port, struct file *filp); | |
128 | static void pl2303_set_termios (struct usb_serial_port *port, | |
129 | struct termios *old); | |
130 | static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, | |
131 | unsigned int cmd, unsigned long arg); | |
132 | static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs); | |
133 | static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs); | |
134 | static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs); | |
135 | static int pl2303_write (struct usb_serial_port *port, | |
136 | const unsigned char *buf, int count); | |
137 | static void pl2303_send (struct usb_serial_port *port); | |
138 | static int pl2303_write_room(struct usb_serial_port *port); | |
139 | static int pl2303_chars_in_buffer(struct usb_serial_port *port); | |
140 | static void pl2303_break_ctl(struct usb_serial_port *port,int break_state); | |
141 | static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file); | |
142 | static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file, | |
143 | unsigned int set, unsigned int clear); | |
144 | static int pl2303_startup (struct usb_serial *serial); | |
145 | static void pl2303_shutdown (struct usb_serial *serial); | |
146 | static struct pl2303_buf *pl2303_buf_alloc(unsigned int size); | |
147 | static void pl2303_buf_free(struct pl2303_buf *pb); | |
148 | static void pl2303_buf_clear(struct pl2303_buf *pb); | |
149 | static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb); | |
150 | static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb); | |
151 | static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf, | |
152 | unsigned int count); | |
153 | static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf, | |
154 | unsigned int count); | |
155 | ||
156 | ||
157 | /* All of the device info needed for the PL2303 SIO serial converter */ | |
ea65370d | 158 | static struct usb_serial_driver pl2303_device = { |
18fcac35 GKH |
159 | .driver = { |
160 | .owner = THIS_MODULE, | |
269bda1c | 161 | .name = "pl2303", |
18fcac35 | 162 | }, |
1da177e4 LT |
163 | .id_table = id_table, |
164 | .num_interrupt_in = NUM_DONT_CARE, | |
165 | .num_bulk_in = 1, | |
166 | .num_bulk_out = 1, | |
167 | .num_ports = 1, | |
168 | .open = pl2303_open, | |
169 | .close = pl2303_close, | |
170 | .write = pl2303_write, | |
171 | .ioctl = pl2303_ioctl, | |
172 | .break_ctl = pl2303_break_ctl, | |
173 | .set_termios = pl2303_set_termios, | |
174 | .tiocmget = pl2303_tiocmget, | |
175 | .tiocmset = pl2303_tiocmset, | |
176 | .read_bulk_callback = pl2303_read_bulk_callback, | |
177 | .read_int_callback = pl2303_read_int_callback, | |
178 | .write_bulk_callback = pl2303_write_bulk_callback, | |
179 | .write_room = pl2303_write_room, | |
180 | .chars_in_buffer = pl2303_chars_in_buffer, | |
181 | .attach = pl2303_startup, | |
182 | .shutdown = pl2303_shutdown, | |
183 | }; | |
184 | ||
185 | enum pl2303_type { | |
186 | type_0, /* don't know the difference between type 0 and */ | |
187 | type_1, /* type 1, until someone from prolific tells us... */ | |
188 | HX, /* HX version of the pl2303 chip */ | |
189 | }; | |
190 | ||
191 | struct pl2303_private { | |
192 | spinlock_t lock; | |
193 | struct pl2303_buf *buf; | |
194 | int write_urb_in_use; | |
195 | wait_queue_head_t delta_msr_wait; | |
196 | u8 line_control; | |
197 | u8 line_status; | |
198 | u8 termios_initialized; | |
199 | enum pl2303_type type; | |
200 | }; | |
201 | ||
202 | ||
203 | static int pl2303_startup (struct usb_serial *serial) | |
204 | { | |
205 | struct pl2303_private *priv; | |
206 | enum pl2303_type type = type_0; | |
207 | int i; | |
208 | ||
209 | if (serial->dev->descriptor.bDeviceClass == 0x02) | |
210 | type = type_0; | |
211 | else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) | |
212 | type = HX; | |
213 | else if (serial->dev->descriptor.bDeviceClass == 0x00) | |
214 | type = type_1; | |
215 | else if (serial->dev->descriptor.bDeviceClass == 0xFF) | |
216 | type = type_1; | |
217 | dbg("device type: %d", type); | |
218 | ||
219 | for (i = 0; i < serial->num_ports; ++i) { | |
220 | priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL); | |
221 | if (!priv) | |
222 | goto cleanup; | |
223 | memset (priv, 0x00, sizeof (struct pl2303_private)); | |
224 | spin_lock_init(&priv->lock); | |
225 | priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE); | |
226 | if (priv->buf == NULL) { | |
227 | kfree(priv); | |
228 | goto cleanup; | |
229 | } | |
230 | init_waitqueue_head(&priv->delta_msr_wait); | |
231 | priv->type = type; | |
232 | usb_set_serial_port_data(serial->port[i], priv); | |
233 | } | |
234 | return 0; | |
235 | ||
236 | cleanup: | |
237 | for (--i; i>=0; --i) { | |
238 | priv = usb_get_serial_port_data(serial->port[i]); | |
239 | pl2303_buf_free(priv->buf); | |
240 | kfree(priv); | |
241 | usb_set_serial_port_data(serial->port[i], NULL); | |
242 | } | |
243 | return -ENOMEM; | |
244 | } | |
245 | ||
246 | static int set_control_lines (struct usb_device *dev, u8 value) | |
247 | { | |
248 | int retval; | |
249 | ||
250 | retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0), | |
251 | SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, | |
252 | value, 0, NULL, 0, 100); | |
253 | dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval); | |
254 | return retval; | |
255 | } | |
256 | ||
257 | static int pl2303_write (struct usb_serial_port *port, const unsigned char *buf, int count) | |
258 | { | |
259 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
260 | unsigned long flags; | |
261 | ||
262 | dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count); | |
263 | ||
264 | if (!count) | |
265 | return count; | |
266 | ||
267 | spin_lock_irqsave(&priv->lock, flags); | |
268 | count = pl2303_buf_put(priv->buf, buf, count); | |
269 | spin_unlock_irqrestore(&priv->lock, flags); | |
270 | ||
271 | pl2303_send(port); | |
272 | ||
273 | return count; | |
274 | } | |
275 | ||
276 | static void pl2303_send(struct usb_serial_port *port) | |
277 | { | |
278 | int count, result; | |
279 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
280 | unsigned long flags; | |
281 | ||
282 | dbg("%s - port %d", __FUNCTION__, port->number); | |
283 | ||
284 | spin_lock_irqsave(&priv->lock, flags); | |
285 | ||
286 | if (priv->write_urb_in_use) { | |
287 | spin_unlock_irqrestore(&priv->lock, flags); | |
288 | return; | |
289 | } | |
290 | ||
291 | count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer, | |
292 | port->bulk_out_size); | |
293 | ||
294 | if (count == 0) { | |
295 | spin_unlock_irqrestore(&priv->lock, flags); | |
296 | return; | |
297 | } | |
298 | ||
299 | priv->write_urb_in_use = 1; | |
300 | ||
301 | spin_unlock_irqrestore(&priv->lock, flags); | |
302 | ||
303 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer); | |
304 | ||
305 | port->write_urb->transfer_buffer_length = count; | |
306 | port->write_urb->dev = port->serial->dev; | |
307 | result = usb_submit_urb (port->write_urb, GFP_ATOMIC); | |
308 | if (result) { | |
309 | dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); | |
310 | priv->write_urb_in_use = 0; | |
311 | // TODO: reschedule pl2303_send | |
312 | } | |
313 | ||
314 | schedule_work(&port->work); | |
315 | } | |
316 | ||
317 | static int pl2303_write_room(struct usb_serial_port *port) | |
318 | { | |
319 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
320 | int room = 0; | |
321 | unsigned long flags; | |
322 | ||
323 | dbg("%s - port %d", __FUNCTION__, port->number); | |
324 | ||
325 | spin_lock_irqsave(&priv->lock, flags); | |
326 | room = pl2303_buf_space_avail(priv->buf); | |
327 | spin_unlock_irqrestore(&priv->lock, flags); | |
328 | ||
329 | dbg("%s - returns %d", __FUNCTION__, room); | |
330 | return room; | |
331 | } | |
332 | ||
333 | static int pl2303_chars_in_buffer(struct usb_serial_port *port) | |
334 | { | |
335 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
336 | int chars = 0; | |
337 | unsigned long flags; | |
338 | ||
339 | dbg("%s - port %d", __FUNCTION__, port->number); | |
340 | ||
341 | spin_lock_irqsave(&priv->lock, flags); | |
342 | chars = pl2303_buf_data_avail(priv->buf); | |
343 | spin_unlock_irqrestore(&priv->lock, flags); | |
344 | ||
345 | dbg("%s - returns %d", __FUNCTION__, chars); | |
346 | return chars; | |
347 | } | |
348 | ||
349 | static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios) | |
350 | { | |
351 | struct usb_serial *serial = port->serial; | |
352 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
353 | unsigned long flags; | |
354 | unsigned int cflag; | |
355 | unsigned char *buf; | |
356 | int baud; | |
357 | int i; | |
358 | u8 control; | |
359 | ||
360 | dbg("%s - port %d", __FUNCTION__, port->number); | |
361 | ||
362 | if ((!port->tty) || (!port->tty->termios)) { | |
363 | dbg("%s - no tty structures", __FUNCTION__); | |
364 | return; | |
365 | } | |
366 | ||
367 | spin_lock_irqsave(&priv->lock, flags); | |
368 | if (!priv->termios_initialized) { | |
369 | *(port->tty->termios) = tty_std_termios; | |
370 | port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; | |
371 | priv->termios_initialized = 1; | |
372 | } | |
373 | spin_unlock_irqrestore(&priv->lock, flags); | |
374 | ||
375 | cflag = port->tty->termios->c_cflag; | |
376 | /* check that they really want us to change something */ | |
377 | if (old_termios) { | |
378 | if ((cflag == old_termios->c_cflag) && | |
379 | (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) { | |
380 | dbg("%s - nothing to change...", __FUNCTION__); | |
381 | return; | |
382 | } | |
383 | } | |
384 | ||
385 | buf = kmalloc (7, GFP_KERNEL); | |
386 | if (!buf) { | |
387 | dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__); | |
388 | return; | |
389 | } | |
390 | memset (buf, 0x00, 0x07); | |
391 | ||
392 | i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0), | |
393 | GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, | |
394 | 0, 0, buf, 7, 100); | |
395 | dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i, | |
396 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]); | |
397 | ||
398 | ||
399 | if (cflag & CSIZE) { | |
400 | switch (cflag & CSIZE) { | |
401 | case CS5: buf[6] = 5; break; | |
402 | case CS6: buf[6] = 6; break; | |
403 | case CS7: buf[6] = 7; break; | |
404 | default: | |
405 | case CS8: buf[6] = 8; break; | |
406 | } | |
407 | dbg("%s - data bits = %d", __FUNCTION__, buf[6]); | |
408 | } | |
409 | ||
410 | baud = 0; | |
411 | switch (cflag & CBAUD) { | |
412 | case B0: baud = 0; break; | |
413 | case B75: baud = 75; break; | |
414 | case B150: baud = 150; break; | |
415 | case B300: baud = 300; break; | |
416 | case B600: baud = 600; break; | |
417 | case B1200: baud = 1200; break; | |
418 | case B1800: baud = 1800; break; | |
419 | case B2400: baud = 2400; break; | |
420 | case B4800: baud = 4800; break; | |
421 | case B9600: baud = 9600; break; | |
422 | case B19200: baud = 19200; break; | |
423 | case B38400: baud = 38400; break; | |
424 | case B57600: baud = 57600; break; | |
425 | case B115200: baud = 115200; break; | |
426 | case B230400: baud = 230400; break; | |
427 | case B460800: baud = 460800; break; | |
428 | default: | |
429 | dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n"); | |
430 | break; | |
431 | } | |
432 | dbg("%s - baud = %d", __FUNCTION__, baud); | |
433 | if (baud) { | |
434 | buf[0] = baud & 0xff; | |
435 | buf[1] = (baud >> 8) & 0xff; | |
436 | buf[2] = (baud >> 16) & 0xff; | |
437 | buf[3] = (baud >> 24) & 0xff; | |
438 | } | |
439 | ||
440 | /* For reference buf[4]=0 is 1 stop bits */ | |
441 | /* For reference buf[4]=1 is 1.5 stop bits */ | |
442 | /* For reference buf[4]=2 is 2 stop bits */ | |
443 | if (cflag & CSTOPB) { | |
444 | buf[4] = 2; | |
445 | dbg("%s - stop bits = 2", __FUNCTION__); | |
446 | } else { | |
447 | buf[4] = 0; | |
448 | dbg("%s - stop bits = 1", __FUNCTION__); | |
449 | } | |
450 | ||
451 | if (cflag & PARENB) { | |
452 | /* For reference buf[5]=0 is none parity */ | |
453 | /* For reference buf[5]=1 is odd parity */ | |
454 | /* For reference buf[5]=2 is even parity */ | |
455 | /* For reference buf[5]=3 is mark parity */ | |
456 | /* For reference buf[5]=4 is space parity */ | |
457 | if (cflag & PARODD) { | |
458 | buf[5] = 1; | |
459 | dbg("%s - parity = odd", __FUNCTION__); | |
460 | } else { | |
461 | buf[5] = 2; | |
462 | dbg("%s - parity = even", __FUNCTION__); | |
463 | } | |
464 | } else { | |
465 | buf[5] = 0; | |
466 | dbg("%s - parity = none", __FUNCTION__); | |
467 | } | |
468 | ||
469 | i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0), | |
470 | SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, | |
471 | 0, 0, buf, 7, 100); | |
472 | dbg ("0x21:0x20:0:0 %d", i); | |
473 | ||
474 | /* change control lines if we are switching to or from B0 */ | |
475 | spin_lock_irqsave(&priv->lock, flags); | |
476 | control = priv->line_control; | |
477 | if ((cflag & CBAUD) == B0) | |
478 | priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); | |
479 | else | |
480 | priv->line_control |= (CONTROL_DTR | CONTROL_RTS); | |
481 | if (control != priv->line_control) { | |
482 | control = priv->line_control; | |
483 | spin_unlock_irqrestore(&priv->lock, flags); | |
484 | set_control_lines(serial->dev, control); | |
485 | } else { | |
486 | spin_unlock_irqrestore(&priv->lock, flags); | |
487 | } | |
488 | ||
489 | buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0; | |
490 | ||
491 | i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0), | |
492 | GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, | |
493 | 0, 0, buf, 7, 100); | |
494 | dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i, | |
495 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]); | |
496 | ||
497 | if (cflag & CRTSCTS) { | |
498 | __u16 index; | |
499 | if (priv->type == HX) | |
500 | index = 0x61; | |
501 | else | |
502 | index = 0x41; | |
503 | i = usb_control_msg(serial->dev, | |
504 | usb_sndctrlpipe(serial->dev, 0), | |
505 | VENDOR_WRITE_REQUEST, | |
506 | VENDOR_WRITE_REQUEST_TYPE, | |
507 | 0x0, index, NULL, 0, 100); | |
508 | dbg ("0x40:0x1:0x0:0x%x %d", index, i); | |
509 | } | |
510 | ||
511 | kfree (buf); | |
512 | } | |
513 | ||
514 | static int pl2303_open (struct usb_serial_port *port, struct file *filp) | |
515 | { | |
516 | struct termios tmp_termios; | |
517 | struct usb_serial *serial = port->serial; | |
518 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
519 | unsigned char *buf; | |
520 | int result; | |
521 | ||
522 | dbg("%s - port %d", __FUNCTION__, port->number); | |
523 | ||
1694899f D |
524 | if (priv->type != HX) { |
525 | usb_clear_halt(serial->dev, port->write_urb->pipe); | |
526 | usb_clear_halt(serial->dev, port->read_urb->pipe); | |
527 | } | |
1da177e4 LT |
528 | |
529 | buf = kmalloc(10, GFP_KERNEL); | |
530 | if (buf==NULL) | |
531 | return -ENOMEM; | |
532 | ||
533 | #define FISH(a,b,c,d) \ | |
534 | result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \ | |
535 | b, a, c, d, buf, 1, 100); \ | |
536 | dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]); | |
537 | ||
538 | #define SOUP(a,b,c,d) \ | |
539 | result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \ | |
540 | b, a, c, d, NULL, 0, 100); \ | |
541 | dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result); | |
542 | ||
543 | FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0); | |
544 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0); | |
545 | FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0); | |
546 | FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0); | |
547 | FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0); | |
548 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1); | |
549 | FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0); | |
550 | FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0); | |
551 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1); | |
552 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0); | |
553 | ||
554 | if (priv->type == HX) { | |
555 | /* HX chip */ | |
556 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44); | |
557 | /* reset upstream data pipes */ | |
558 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0); | |
559 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0); | |
560 | } else { | |
561 | SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24); | |
562 | } | |
563 | ||
564 | kfree(buf); | |
565 | ||
566 | /* Setup termios */ | |
567 | if (port->tty) { | |
568 | pl2303_set_termios (port, &tmp_termios); | |
569 | } | |
570 | ||
571 | //FIXME: need to assert RTS and DTR if CRTSCTS off | |
572 | ||
573 | dbg("%s - submitting read urb", __FUNCTION__); | |
574 | port->read_urb->dev = serial->dev; | |
575 | result = usb_submit_urb (port->read_urb, GFP_KERNEL); | |
576 | if (result) { | |
577 | dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result); | |
578 | pl2303_close (port, NULL); | |
579 | return -EPROTO; | |
580 | } | |
581 | ||
582 | dbg("%s - submitting interrupt urb", __FUNCTION__); | |
583 | port->interrupt_in_urb->dev = serial->dev; | |
584 | result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL); | |
585 | if (result) { | |
586 | dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result); | |
587 | pl2303_close (port, NULL); | |
588 | return -EPROTO; | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | ||
593 | ||
594 | static void pl2303_close (struct usb_serial_port *port, struct file *filp) | |
595 | { | |
596 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
597 | unsigned long flags; | |
598 | unsigned int c_cflag; | |
599 | int bps; | |
600 | long timeout; | |
601 | wait_queue_t wait; \ | |
602 | ||
603 | dbg("%s - port %d", __FUNCTION__, port->number); | |
604 | ||
605 | /* wait for data to drain from the buffer */ | |
606 | spin_lock_irqsave(&priv->lock, flags); | |
607 | timeout = PL2303_CLOSING_WAIT; | |
608 | init_waitqueue_entry(&wait, current); | |
609 | add_wait_queue(&port->tty->write_wait, &wait); | |
610 | for (;;) { | |
611 | set_current_state(TASK_INTERRUPTIBLE); | |
612 | if (pl2303_buf_data_avail(priv->buf) == 0 | |
613 | || timeout == 0 || signal_pending(current) | |
614 | || !usb_get_intfdata(port->serial->interface)) /* disconnect */ | |
615 | break; | |
616 | spin_unlock_irqrestore(&priv->lock, flags); | |
617 | timeout = schedule_timeout(timeout); | |
618 | spin_lock_irqsave(&priv->lock, flags); | |
619 | } | |
620 | set_current_state(TASK_RUNNING); | |
621 | remove_wait_queue(&port->tty->write_wait, &wait); | |
622 | /* clear out any remaining data in the buffer */ | |
623 | pl2303_buf_clear(priv->buf); | |
624 | spin_unlock_irqrestore(&priv->lock, flags); | |
625 | ||
626 | /* wait for characters to drain from the device */ | |
627 | /* (this is long enough for the entire 256 byte */ | |
628 | /* pl2303 hardware buffer to drain with no flow */ | |
629 | /* control for data rates of 1200 bps or more, */ | |
630 | /* for lower rates we should really know how much */ | |
631 | /* data is in the buffer to compute a delay */ | |
632 | /* that is not unnecessarily long) */ | |
633 | bps = tty_get_baud_rate(port->tty); | |
634 | if (bps > 1200) | |
635 | timeout = max((HZ*2560)/bps,HZ/10); | |
636 | else | |
637 | timeout = 2*HZ; | |
22c43863 | 638 | schedule_timeout_interruptible(timeout); |
1da177e4 LT |
639 | |
640 | /* shutdown our urbs */ | |
641 | dbg("%s - shutting down urbs", __FUNCTION__); | |
642 | usb_kill_urb(port->write_urb); | |
643 | usb_kill_urb(port->read_urb); | |
644 | usb_kill_urb(port->interrupt_in_urb); | |
645 | ||
646 | if (port->tty) { | |
647 | c_cflag = port->tty->termios->c_cflag; | |
648 | if (c_cflag & HUPCL) { | |
649 | /* drop DTR and RTS */ | |
650 | spin_lock_irqsave(&priv->lock, flags); | |
651 | priv->line_control = 0; | |
652 | spin_unlock_irqrestore (&priv->lock, flags); | |
653 | set_control_lines (port->serial->dev, 0); | |
654 | } | |
655 | } | |
656 | } | |
657 | ||
658 | static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file, | |
659 | unsigned int set, unsigned int clear) | |
660 | { | |
661 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
662 | unsigned long flags; | |
663 | u8 control; | |
664 | ||
6fdd8e8e FL |
665 | if (!usb_get_intfdata(port->serial->interface)) |
666 | return -ENODEV; | |
667 | ||
1da177e4 LT |
668 | spin_lock_irqsave (&priv->lock, flags); |
669 | if (set & TIOCM_RTS) | |
670 | priv->line_control |= CONTROL_RTS; | |
671 | if (set & TIOCM_DTR) | |
672 | priv->line_control |= CONTROL_DTR; | |
673 | if (clear & TIOCM_RTS) | |
674 | priv->line_control &= ~CONTROL_RTS; | |
675 | if (clear & TIOCM_DTR) | |
676 | priv->line_control &= ~CONTROL_DTR; | |
677 | control = priv->line_control; | |
678 | spin_unlock_irqrestore (&priv->lock, flags); | |
679 | ||
680 | return set_control_lines (port->serial->dev, control); | |
681 | } | |
682 | ||
683 | static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file) | |
684 | { | |
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 | dbg("%s (%d)", __FUNCTION__, port->number); | |
692 | ||
6fdd8e8e FL |
693 | if (!usb_get_intfdata(port->serial->interface)) |
694 | return -ENODEV; | |
695 | ||
1da177e4 LT |
696 | spin_lock_irqsave (&priv->lock, flags); |
697 | mcr = priv->line_control; | |
698 | status = priv->line_status; | |
699 | spin_unlock_irqrestore (&priv->lock, flags); | |
700 | ||
701 | result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) | |
702 | | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) | |
703 | | ((status & UART_CTS) ? TIOCM_CTS : 0) | |
704 | | ((status & UART_DSR) ? TIOCM_DSR : 0) | |
705 | | ((status & UART_RING) ? TIOCM_RI : 0) | |
706 | | ((status & UART_DCD) ? TIOCM_CD : 0); | |
707 | ||
708 | dbg("%s - result = %x", __FUNCTION__, result); | |
709 | ||
710 | return result; | |
711 | } | |
712 | ||
713 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) | |
714 | { | |
715 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
716 | unsigned long flags; | |
717 | unsigned int prevstatus; | |
718 | unsigned int status; | |
719 | unsigned int changed; | |
720 | ||
721 | spin_lock_irqsave (&priv->lock, flags); | |
722 | prevstatus = priv->line_status; | |
723 | spin_unlock_irqrestore (&priv->lock, flags); | |
724 | ||
725 | while (1) { | |
726 | interruptible_sleep_on(&priv->delta_msr_wait); | |
727 | /* see if a signal did it */ | |
728 | if (signal_pending(current)) | |
729 | return -ERESTARTSYS; | |
730 | ||
731 | spin_lock_irqsave (&priv->lock, flags); | |
732 | status = priv->line_status; | |
733 | spin_unlock_irqrestore (&priv->lock, flags); | |
734 | ||
735 | changed=prevstatus^status; | |
736 | ||
737 | if (((arg & TIOCM_RNG) && (changed & UART_RING)) || | |
738 | ((arg & TIOCM_DSR) && (changed & UART_DSR)) || | |
739 | ((arg & TIOCM_CD) && (changed & UART_DCD)) || | |
740 | ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) { | |
741 | return 0; | |
742 | } | |
743 | prevstatus = status; | |
744 | } | |
745 | /* NOTREACHED */ | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg) | |
750 | { | |
751 | dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd); | |
752 | ||
753 | switch (cmd) { | |
754 | case TIOCMIWAIT: | |
755 | dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number); | |
756 | return wait_modem_info(port, arg); | |
757 | ||
758 | default: | |
759 | dbg("%s not supported = 0x%04x", __FUNCTION__, cmd); | |
760 | break; | |
761 | } | |
762 | ||
763 | return -ENOIOCTLCMD; | |
764 | } | |
765 | ||
766 | static void pl2303_break_ctl (struct usb_serial_port *port, int break_state) | |
767 | { | |
768 | struct usb_serial *serial = port->serial; | |
769 | u16 state; | |
770 | int result; | |
771 | ||
772 | dbg("%s - port %d", __FUNCTION__, port->number); | |
773 | ||
774 | if (break_state == 0) | |
775 | state = BREAK_OFF; | |
776 | else | |
777 | state = BREAK_ON; | |
778 | dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on"); | |
779 | ||
780 | result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0), | |
781 | BREAK_REQUEST, BREAK_REQUEST_TYPE, state, | |
782 | 0, NULL, 0, 100); | |
783 | if (result) | |
784 | dbg("%s - error sending break = %d", __FUNCTION__, result); | |
785 | } | |
786 | ||
787 | ||
788 | static void pl2303_shutdown (struct usb_serial *serial) | |
789 | { | |
790 | int i; | |
791 | struct pl2303_private *priv; | |
792 | ||
793 | dbg("%s", __FUNCTION__); | |
794 | ||
795 | for (i = 0; i < serial->num_ports; ++i) { | |
796 | priv = usb_get_serial_port_data(serial->port[i]); | |
797 | if (priv) { | |
798 | pl2303_buf_free(priv->buf); | |
799 | kfree(priv); | |
800 | usb_set_serial_port_data(serial->port[i], NULL); | |
801 | } | |
802 | } | |
803 | } | |
804 | ||
97bb13ec FL |
805 | static void pl2303_update_line_status(struct usb_serial_port *port, |
806 | unsigned char *data, | |
807 | unsigned int actual_length) | |
808 | { | |
809 | ||
810 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
811 | unsigned long flags; | |
812 | u8 status_idx = UART_STATE; | |
813 | u8 length = UART_STATE; | |
814 | ||
815 | if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) && | |
b8f4c1d6 LFC |
816 | (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 || |
817 | le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 || | |
818 | le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) { | |
97bb13ec FL |
819 | length = 1; |
820 | status_idx = 0; | |
821 | } | |
822 | ||
823 | if (actual_length < length) | |
824 | goto exit; | |
825 | ||
826 | /* Save off the uart status for others to look at */ | |
827 | spin_lock_irqsave(&priv->lock, flags); | |
828 | priv->line_status = data[status_idx]; | |
829 | spin_unlock_irqrestore(&priv->lock, flags); | |
830 | ||
831 | exit: | |
832 | return; | |
833 | } | |
1da177e4 LT |
834 | |
835 | static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs) | |
836 | { | |
837 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
1da177e4 | 838 | unsigned char *data = urb->transfer_buffer; |
97bb13ec | 839 | unsigned int actual_length = urb->actual_length; |
1da177e4 | 840 | int status; |
1da177e4 LT |
841 | |
842 | dbg("%s (%d)", __FUNCTION__, port->number); | |
843 | ||
844 | switch (urb->status) { | |
845 | case 0: | |
846 | /* success */ | |
847 | break; | |
848 | case -ECONNRESET: | |
849 | case -ENOENT: | |
850 | case -ESHUTDOWN: | |
851 | /* this urb is terminated, clean up */ | |
852 | dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); | |
853 | return; | |
854 | default: | |
855 | dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); | |
856 | goto exit; | |
857 | } | |
858 | ||
1da177e4 | 859 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer); |
97bb13ec | 860 | pl2303_update_line_status(port, data, actual_length); |
1da177e4 | 861 | |
1da177e4 LT |
862 | exit: |
863 | status = usb_submit_urb (urb, GFP_ATOMIC); | |
864 | if (status) | |
865 | dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n", | |
866 | __FUNCTION__, status); | |
867 | } | |
868 | ||
869 | ||
870 | static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
871 | { | |
872 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
873 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
874 | struct tty_struct *tty; | |
875 | unsigned char *data = urb->transfer_buffer; | |
876 | unsigned long flags; | |
877 | int i; | |
878 | int result; | |
879 | u8 status; | |
880 | char tty_flag; | |
881 | ||
882 | dbg("%s - port %d", __FUNCTION__, port->number); | |
883 | ||
884 | if (urb->status) { | |
885 | dbg("%s - urb->status = %d", __FUNCTION__, urb->status); | |
886 | if (!port->open_count) { | |
887 | dbg("%s - port is closed, exiting.", __FUNCTION__); | |
888 | return; | |
889 | } | |
890 | if (urb->status == -EPROTO) { | |
891 | /* PL2303 mysteriously fails with -EPROTO reschedule the read */ | |
892 | dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__); | |
893 | urb->status = 0; | |
894 | urb->dev = port->serial->dev; | |
895 | result = usb_submit_urb(urb, GFP_ATOMIC); | |
896 | if (result) | |
897 | dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); | |
898 | return; | |
899 | } | |
900 | dbg("%s - unable to handle the error, exiting.", __FUNCTION__); | |
901 | return; | |
902 | } | |
903 | ||
904 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); | |
905 | ||
906 | /* get tty_flag from status */ | |
907 | tty_flag = TTY_NORMAL; | |
908 | ||
909 | spin_lock_irqsave(&priv->lock, flags); | |
910 | status = priv->line_status; | |
911 | priv->line_status &= ~UART_STATE_TRANSIENT_MASK; | |
912 | spin_unlock_irqrestore(&priv->lock, flags); | |
913 | wake_up_interruptible (&priv->delta_msr_wait); | |
914 | ||
915 | /* break takes precedence over parity, */ | |
916 | /* which takes precedence over framing errors */ | |
917 | if (status & UART_BREAK_ERROR ) | |
918 | tty_flag = TTY_BREAK; | |
919 | else if (status & UART_PARITY_ERROR) | |
920 | tty_flag = TTY_PARITY; | |
921 | else if (status & UART_FRAME_ERROR) | |
922 | tty_flag = TTY_FRAME; | |
923 | dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag); | |
924 | ||
925 | tty = port->tty; | |
926 | if (tty && urb->actual_length) { | |
927 | /* overrun is special, not associated with a char */ | |
928 | if (status & UART_OVERRUN_ERROR) | |
929 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
930 | ||
931 | for (i = 0; i < urb->actual_length; ++i) { | |
932 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { | |
933 | tty_flip_buffer_push(tty); | |
934 | } | |
935 | tty_insert_flip_char (tty, data[i], tty_flag); | |
936 | } | |
937 | tty_flip_buffer_push (tty); | |
938 | } | |
939 | ||
940 | /* Schedule the next read _if_ we are still open */ | |
941 | if (port->open_count) { | |
942 | urb->dev = port->serial->dev; | |
943 | result = usb_submit_urb(urb, GFP_ATOMIC); | |
944 | if (result) | |
945 | dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); | |
946 | } | |
947 | ||
948 | return; | |
949 | } | |
950 | ||
951 | ||
952 | ||
953 | static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
954 | { | |
955 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
956 | struct pl2303_private *priv = usb_get_serial_port_data(port); | |
957 | int result; | |
958 | ||
959 | dbg("%s - port %d", __FUNCTION__, port->number); | |
960 | ||
961 | switch (urb->status) { | |
962 | case 0: | |
963 | /* success */ | |
964 | break; | |
965 | case -ECONNRESET: | |
966 | case -ENOENT: | |
967 | case -ESHUTDOWN: | |
968 | /* this urb is terminated, clean up */ | |
969 | dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); | |
970 | priv->write_urb_in_use = 0; | |
971 | return; | |
972 | default: | |
973 | /* error in the urb, so we have to resubmit it */ | |
974 | dbg("%s - Overflow in write", __FUNCTION__); | |
975 | dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); | |
976 | port->write_urb->transfer_buffer_length = 1; | |
977 | port->write_urb->dev = port->serial->dev; | |
978 | result = usb_submit_urb (port->write_urb, GFP_ATOMIC); | |
979 | if (result) | |
980 | dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result); | |
981 | else | |
982 | return; | |
983 | } | |
984 | ||
985 | priv->write_urb_in_use = 0; | |
986 | ||
987 | /* send any buffered data */ | |
988 | pl2303_send(port); | |
989 | } | |
990 | ||
991 | ||
992 | /* | |
993 | * pl2303_buf_alloc | |
994 | * | |
995 | * Allocate a circular buffer and all associated memory. | |
996 | */ | |
997 | ||
998 | static struct pl2303_buf *pl2303_buf_alloc(unsigned int size) | |
999 | { | |
1000 | ||
1001 | struct pl2303_buf *pb; | |
1002 | ||
1003 | ||
1004 | if (size == 0) | |
1005 | return NULL; | |
1006 | ||
1007 | pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL); | |
1008 | if (pb == NULL) | |
1009 | return NULL; | |
1010 | ||
1011 | pb->buf_buf = kmalloc(size, GFP_KERNEL); | |
1012 | if (pb->buf_buf == NULL) { | |
1013 | kfree(pb); | |
1014 | return NULL; | |
1015 | } | |
1016 | ||
1017 | pb->buf_size = size; | |
1018 | pb->buf_get = pb->buf_put = pb->buf_buf; | |
1019 | ||
1020 | return pb; | |
1021 | ||
1022 | } | |
1023 | ||
1024 | ||
1025 | /* | |
1026 | * pl2303_buf_free | |
1027 | * | |
1028 | * Free the buffer and all associated memory. | |
1029 | */ | |
1030 | ||
1031 | static void pl2303_buf_free(struct pl2303_buf *pb) | |
1032 | { | |
1bc3c9e1 JJ |
1033 | if (pb) { |
1034 | kfree(pb->buf_buf); | |
1da177e4 LT |
1035 | kfree(pb); |
1036 | } | |
1037 | } | |
1038 | ||
1039 | ||
1040 | /* | |
1041 | * pl2303_buf_clear | |
1042 | * | |
1043 | * Clear out all data in the circular buffer. | |
1044 | */ | |
1045 | ||
1046 | static void pl2303_buf_clear(struct pl2303_buf *pb) | |
1047 | { | |
1048 | if (pb != NULL) | |
1049 | pb->buf_get = pb->buf_put; | |
1050 | /* equivalent to a get of all data available */ | |
1051 | } | |
1052 | ||
1053 | ||
1054 | /* | |
1055 | * pl2303_buf_data_avail | |
1056 | * | |
1057 | * Return the number of bytes of data available in the circular | |
1058 | * buffer. | |
1059 | */ | |
1060 | ||
1061 | static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb) | |
1062 | { | |
1063 | if (pb != NULL) | |
1064 | return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size); | |
1065 | else | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | ||
1070 | /* | |
1071 | * pl2303_buf_space_avail | |
1072 | * | |
1073 | * Return the number of bytes of space available in the circular | |
1074 | * buffer. | |
1075 | */ | |
1076 | ||
1077 | static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb) | |
1078 | { | |
1079 | if (pb != NULL) | |
1080 | return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size); | |
1081 | else | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | ||
1086 | /* | |
1087 | * pl2303_buf_put | |
1088 | * | |
1089 | * Copy data data from a user buffer and put it into the circular buffer. | |
1090 | * Restrict to the amount of space available. | |
1091 | * | |
1092 | * Return the number of bytes copied. | |
1093 | */ | |
1094 | ||
1095 | static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf, | |
1096 | unsigned int count) | |
1097 | { | |
1098 | ||
1099 | unsigned int len; | |
1100 | ||
1101 | ||
1102 | if (pb == NULL) | |
1103 | return 0; | |
1104 | ||
1105 | len = pl2303_buf_space_avail(pb); | |
1106 | if (count > len) | |
1107 | count = len; | |
1108 | ||
1109 | if (count == 0) | |
1110 | return 0; | |
1111 | ||
1112 | len = pb->buf_buf + pb->buf_size - pb->buf_put; | |
1113 | if (count > len) { | |
1114 | memcpy(pb->buf_put, buf, len); | |
1115 | memcpy(pb->buf_buf, buf+len, count - len); | |
1116 | pb->buf_put = pb->buf_buf + count - len; | |
1117 | } else { | |
1118 | memcpy(pb->buf_put, buf, count); | |
1119 | if (count < len) | |
1120 | pb->buf_put += count; | |
1121 | else /* count == len */ | |
1122 | pb->buf_put = pb->buf_buf; | |
1123 | } | |
1124 | ||
1125 | return count; | |
1126 | ||
1127 | } | |
1128 | ||
1129 | ||
1130 | /* | |
1131 | * pl2303_buf_get | |
1132 | * | |
1133 | * Get data from the circular buffer and copy to the given buffer. | |
1134 | * Restrict to the amount of data available. | |
1135 | * | |
1136 | * Return the number of bytes copied. | |
1137 | */ | |
1138 | ||
1139 | static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf, | |
1140 | unsigned int count) | |
1141 | { | |
1142 | ||
1143 | unsigned int len; | |
1144 | ||
1145 | ||
1146 | if (pb == NULL) | |
1147 | return 0; | |
1148 | ||
1149 | len = pl2303_buf_data_avail(pb); | |
1150 | if (count > len) | |
1151 | count = len; | |
1152 | ||
1153 | if (count == 0) | |
1154 | return 0; | |
1155 | ||
1156 | len = pb->buf_buf + pb->buf_size - pb->buf_get; | |
1157 | if (count > len) { | |
1158 | memcpy(buf, pb->buf_get, len); | |
1159 | memcpy(buf+len, pb->buf_buf, count - len); | |
1160 | pb->buf_get = pb->buf_buf + count - len; | |
1161 | } else { | |
1162 | memcpy(buf, pb->buf_get, count); | |
1163 | if (count < len) | |
1164 | pb->buf_get += count; | |
1165 | else /* count == len */ | |
1166 | pb->buf_get = pb->buf_buf; | |
1167 | } | |
1168 | ||
1169 | return count; | |
1170 | ||
1171 | } | |
1172 | ||
1173 | static int __init pl2303_init (void) | |
1174 | { | |
1175 | int retval; | |
1176 | retval = usb_serial_register(&pl2303_device); | |
1177 | if (retval) | |
1178 | goto failed_usb_serial_register; | |
1179 | retval = usb_register(&pl2303_driver); | |
1180 | if (retval) | |
1181 | goto failed_usb_register; | |
17a882fc | 1182 | info(DRIVER_DESC); |
1da177e4 LT |
1183 | return 0; |
1184 | failed_usb_register: | |
1185 | usb_serial_deregister(&pl2303_device); | |
1186 | failed_usb_serial_register: | |
1187 | return retval; | |
1188 | } | |
1189 | ||
1190 | ||
1191 | static void __exit pl2303_exit (void) | |
1192 | { | |
1193 | usb_deregister (&pl2303_driver); | |
1194 | usb_serial_deregister (&pl2303_device); | |
1195 | } | |
1196 | ||
1197 | ||
1198 | module_init(pl2303_init); | |
1199 | module_exit(pl2303_exit); | |
1200 | ||
1201 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1da177e4 LT |
1202 | MODULE_LICENSE("GPL"); |
1203 | ||
1204 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
1205 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
1206 |