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49cdee0e KL |
1 | /* |
2 | * Ours Technology Inc. OTi-6858 USB to serial adapter driver. | |
3 | * | |
4 | * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20) | |
5 | * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail) | |
6 | * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) | |
7 | * Copyright (C) 2003 IBM Corp. | |
8 | * | |
9 | * Many thanks to the authors of pl2303 driver: all functions in this file | |
10 | * are heavily based on pl2303 code, buffering code is a 1-to-1 copy. | |
11 | * | |
12 | * Warning! You use this driver on your own risk! The only official | |
13 | * description of this device I have is datasheet from manufacturer, | |
14 | * and it doesn't contain almost any information needed to write a driver. | |
15 | * Almost all knowlegde used while writing this driver was gathered by: | |
16 | * - analyzing traffic between device and the M$ Windows 2000 driver, | |
17 | * - trying different bit combinations and checking pin states | |
18 | * with a voltmeter, | |
19 | * - receiving malformed frames and producing buffer overflows | |
20 | * to learn how errors are reported, | |
21 | * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE | |
22 | * CONNECTED TO IT! | |
23 | * | |
24 | * This program is free software; you can redistribute it and/or modify | |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation; either version 2 of the License. | |
27 | * | |
28 | * See Documentation/usb/usb-serial.txt for more information on using this driver | |
29 | * | |
30 | * TODO: | |
31 | * - implement correct flushing for ioctls and oti6858_close() | |
32 | * - check how errors (rx overflow, parity error, framing error) are reported | |
33 | * - implement oti6858_break_ctl() | |
34 | * - implement more ioctls | |
35 | * - test/implement flow control | |
36 | * - allow setting custom baud rates | |
37 | */ | |
38 | ||
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 <linux/usb.h> | |
51 | #include <linux/usb/serial.h> | |
52 | #include <asm/uaccess.h> | |
53 | #include "oti6858.h" | |
54 | ||
55 | #define OTI6858_DESCRIPTION \ | |
56 | "Ours Technology Inc. OTi-6858 USB to serial adapter driver" | |
57 | #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>" | |
58 | #define OTI6858_VERSION "0.1" | |
59 | ||
60 | static struct usb_device_id id_table [] = { | |
61 | { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, | |
62 | { } | |
63 | }; | |
64 | ||
65 | MODULE_DEVICE_TABLE(usb, id_table); | |
66 | ||
67 | static struct usb_driver oti6858_driver = { | |
68 | .name = "oti6858", | |
69 | .probe = usb_serial_probe, | |
70 | .disconnect = usb_serial_disconnect, | |
71 | .id_table = id_table, | |
72 | .no_dynamic_id = 1, | |
73 | }; | |
74 | ||
75 | static int debug; | |
76 | ||
77 | ||
78 | /* buffering code, copied from pl2303 driver */ | |
79 | #define PL2303_BUF_SIZE 1024 | |
80 | #define PL2303_TMP_BUF_SIZE 1024 | |
81 | ||
82 | struct pl2303_buf { | |
83 | unsigned int buf_size; | |
84 | char *buf_buf; | |
85 | char *buf_get; | |
86 | char *buf_put; | |
87 | }; | |
88 | ||
89 | /* requests */ | |
90 | #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) | |
91 | #define OTI6858_REQ_T_GET_STATUS 0x01 | |
92 | ||
93 | #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) | |
94 | #define OTI6858_REQ_T_SET_LINE 0x00 | |
95 | ||
96 | #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) | |
97 | #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 | |
98 | ||
99 | /* format of the control packet */ | |
100 | struct oti6858_control_pkt { | |
101 | u16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ | |
102 | #define OTI6858_MAX_BAUD_RATE 3000000 | |
103 | u8 frame_fmt; | |
104 | #define FMT_STOP_BITS_MASK 0xc0 | |
105 | #define FMT_STOP_BITS_1 0x00 | |
106 | #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ | |
107 | #define FMT_PARITY_MASK 0x38 | |
108 | #define FMT_PARITY_NONE 0x00 | |
109 | #define FMT_PARITY_ODD 0x08 | |
110 | #define FMT_PARITY_EVEN 0x18 | |
111 | #define FMT_PARITY_MARK 0x28 | |
112 | #define FMT_PARITY_SPACE 0x38 | |
113 | #define FMT_DATA_BITS_MASK 0x03 | |
114 | #define FMT_DATA_BITS_5 0x00 | |
115 | #define FMT_DATA_BITS_6 0x01 | |
116 | #define FMT_DATA_BITS_7 0x02 | |
117 | #define FMT_DATA_BITS_8 0x03 | |
118 | u8 something; /* always equals 0x43 */ | |
119 | u8 control; /* settings of flow control lines */ | |
120 | #define CONTROL_MASK 0x0c | |
121 | #define CONTROL_DTR_HIGH 0x08 | |
122 | #define CONTROL_RTS_HIGH 0x04 | |
123 | u8 tx_status; | |
124 | #define TX_BUFFER_EMPTIED 0x09 | |
125 | u8 pin_state; | |
126 | #define PIN_MASK 0x3f | |
127 | #define PIN_RTS 0x20 /* output pin */ | |
128 | #define PIN_CTS 0x10 /* input pin, active low */ | |
129 | #define PIN_DSR 0x08 /* input pin, active low */ | |
130 | #define PIN_DTR 0x04 /* output pin */ | |
131 | #define PIN_RI 0x02 /* input pin, active low */ | |
132 | #define PIN_DCD 0x01 /* input pin, active low */ | |
133 | u8 rx_bytes_avail; /* number of bytes in rx buffer */; | |
134 | }; | |
135 | ||
136 | #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) | |
137 | #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ | |
138 | ( ((a)->divisor == (priv)->pending_setup.divisor) \ | |
139 | && ((a)->control == (priv)->pending_setup.control) \ | |
140 | && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt) ) | |
141 | ||
142 | /* function prototypes */ | |
143 | static int oti6858_open(struct usb_serial_port *port, struct file *filp); | |
144 | static void oti6858_close(struct usb_serial_port *port, struct file *filp); | |
145 | static void oti6858_set_termios(struct usb_serial_port *port, | |
146 | struct ktermios *old); | |
147 | static int oti6858_ioctl(struct usb_serial_port *port, struct file *file, | |
148 | unsigned int cmd, unsigned long arg); | |
149 | static void oti6858_read_int_callback(struct urb *urb); | |
150 | static void oti6858_read_bulk_callback(struct urb *urb); | |
151 | static void oti6858_write_bulk_callback(struct urb *urb); | |
152 | static int oti6858_write(struct usb_serial_port *port, | |
153 | const unsigned char *buf, int count); | |
154 | static int oti6858_write_room(struct usb_serial_port *port); | |
155 | static void oti6858_break_ctl(struct usb_serial_port *port, int break_state); | |
156 | static int oti6858_chars_in_buffer(struct usb_serial_port *port); | |
157 | static int oti6858_tiocmget(struct usb_serial_port *port, struct file *file); | |
158 | static int oti6858_tiocmset(struct usb_serial_port *port, struct file *file, | |
159 | unsigned int set, unsigned int clear); | |
160 | static int oti6858_startup(struct usb_serial *serial); | |
161 | static void oti6858_shutdown(struct usb_serial *serial); | |
162 | ||
163 | /* functions operating on buffers */ | |
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, | |
170 | unsigned int count); | |
171 | static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf, | |
172 | unsigned int count); | |
173 | ||
174 | ||
175 | /* device info */ | |
176 | static struct usb_serial_driver oti6858_device = { | |
177 | .driver = { | |
178 | .owner = THIS_MODULE, | |
179 | .name = "oti6858", | |
180 | }, | |
181 | .id_table = id_table, | |
182 | .num_interrupt_in = 1, | |
183 | .num_bulk_in = 1, | |
184 | .num_bulk_out = 1, | |
185 | .num_ports = 1, | |
186 | .open = oti6858_open, | |
187 | .close = oti6858_close, | |
188 | .write = oti6858_write, | |
189 | .ioctl = oti6858_ioctl, | |
190 | .break_ctl = oti6858_break_ctl, | |
191 | .set_termios = oti6858_set_termios, | |
192 | .tiocmget = oti6858_tiocmget, | |
193 | .tiocmset = oti6858_tiocmset, | |
194 | .read_bulk_callback = oti6858_read_bulk_callback, | |
195 | .read_int_callback = oti6858_read_int_callback, | |
196 | .write_bulk_callback = oti6858_write_bulk_callback, | |
197 | .write_room = oti6858_write_room, | |
198 | .chars_in_buffer = oti6858_chars_in_buffer, | |
199 | .attach = oti6858_startup, | |
200 | .shutdown = oti6858_shutdown, | |
201 | }; | |
202 | ||
203 | struct oti6858_private { | |
204 | spinlock_t lock; | |
205 | ||
206 | struct pl2303_buf *buf; | |
207 | struct oti6858_control_pkt status; | |
208 | ||
209 | struct { | |
210 | u8 read_urb_in_use; | |
211 | u8 write_urb_in_use; | |
212 | u8 termios_initialized; | |
213 | } flags; | |
214 | struct delayed_work delayed_write_work; | |
215 | ||
216 | struct { | |
217 | u16 divisor; | |
218 | u8 frame_fmt; | |
219 | u8 control; | |
220 | } pending_setup; | |
221 | u8 transient; | |
222 | u8 setup_done; | |
223 | struct delayed_work delayed_setup_work; | |
224 | ||
225 | wait_queue_head_t intr_wait; | |
226 | struct usb_serial_port *port; /* USB port with which associated */ | |
227 | }; | |
228 | ||
229 | #undef dbg | |
230 | /* #define dbg(format, arg...) printk(KERN_INFO "%s: " format "\n", __FILE__, ## arg) */ | |
231 | #define dbg(format, arg...) printk(KERN_INFO "" format "\n", ## arg) | |
232 | ||
233 | static void setup_line(struct work_struct *work) | |
234 | { | |
235 | struct oti6858_private *priv = container_of(work, struct oti6858_private, delayed_setup_work.work); | |
236 | struct usb_serial_port *port = priv->port; | |
237 | struct oti6858_control_pkt *new_setup; | |
238 | unsigned long flags; | |
239 | int result; | |
240 | ||
241 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
242 | ||
243 | if ((new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == NULL) { | |
244 | dev_err(&port->dev, "%s(): out of memory!\n", __FUNCTION__); | |
245 | /* we will try again */ | |
246 | schedule_delayed_work(&priv->delayed_setup_work, msecs_to_jiffies(2)); | |
247 | return; | |
248 | } | |
249 | ||
250 | result = usb_control_msg(port->serial->dev, | |
251 | usb_rcvctrlpipe(port->serial->dev, 0), | |
252 | OTI6858_REQ_T_GET_STATUS, | |
253 | OTI6858_REQ_GET_STATUS, | |
254 | 0, 0, | |
255 | new_setup, OTI6858_CTRL_PKT_SIZE, | |
256 | 100); | |
257 | ||
258 | if (result != OTI6858_CTRL_PKT_SIZE) { | |
259 | dev_err(&port->dev, "%s(): error reading status", __FUNCTION__); | |
260 | kfree(new_setup); | |
261 | /* we will try again */ | |
262 | schedule_delayed_work(&priv->delayed_setup_work, msecs_to_jiffies(2)); | |
263 | return; | |
264 | } | |
265 | ||
266 | spin_lock_irqsave(&priv->lock, flags); | |
267 | if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { | |
268 | new_setup->divisor = priv->pending_setup.divisor; | |
269 | new_setup->control = priv->pending_setup.control; | |
270 | new_setup->frame_fmt = priv->pending_setup.frame_fmt; | |
271 | ||
272 | spin_unlock_irqrestore(&priv->lock, flags); | |
273 | result = usb_control_msg(port->serial->dev, | |
274 | usb_sndctrlpipe(port->serial->dev, 0), | |
275 | OTI6858_REQ_T_SET_LINE, | |
276 | OTI6858_REQ_SET_LINE, | |
277 | 0, 0, | |
278 | new_setup, OTI6858_CTRL_PKT_SIZE, | |
279 | 100); | |
280 | } else { | |
281 | spin_unlock_irqrestore(&priv->lock, flags); | |
282 | result = 0; | |
283 | } | |
284 | kfree(new_setup); | |
285 | ||
286 | spin_lock_irqsave(&priv->lock, flags); | |
287 | if (result != OTI6858_CTRL_PKT_SIZE) | |
288 | priv->transient = 0; | |
289 | priv->setup_done = 1; | |
290 | spin_unlock_irqrestore(&priv->lock, flags); | |
291 | ||
292 | dbg("%s(): submitting interrupt urb", __FUNCTION__); | |
293 | port->interrupt_in_urb->dev = port->serial->dev; | |
294 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
295 | if (result != 0) { | |
296 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
297 | " with error %d\n", __FUNCTION__, result); | |
298 | } | |
299 | } | |
300 | ||
301 | void send_data(struct work_struct *work) | |
302 | { | |
303 | struct oti6858_private *priv = container_of(work, struct oti6858_private, delayed_write_work.work); | |
304 | struct usb_serial_port *port = priv->port; | |
305 | int count = 0, result; | |
306 | unsigned long flags; | |
307 | unsigned char allow; | |
308 | ||
309 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
310 | ||
311 | spin_lock_irqsave(&priv->lock, flags); | |
312 | if (priv->flags.write_urb_in_use) { | |
313 | spin_unlock_irqrestore(&priv->lock, flags); | |
314 | schedule_delayed_work(&priv->delayed_write_work, msecs_to_jiffies(2)); | |
315 | return; | |
316 | } | |
317 | priv->flags.write_urb_in_use = 1; | |
318 | ||
319 | count = pl2303_buf_data_avail(priv->buf); | |
320 | spin_unlock_irqrestore(&priv->lock, flags); | |
321 | if (count > port->bulk_out_size) | |
322 | count = port->bulk_out_size; | |
323 | ||
324 | if (count != 0) { | |
325 | result = usb_control_msg(port->serial->dev, | |
326 | usb_rcvctrlpipe(port->serial->dev, 0), | |
327 | OTI6858_REQ_T_CHECK_TXBUFF, | |
328 | OTI6858_REQ_CHECK_TXBUFF, | |
329 | count, 0, &allow, 1, 100); | |
330 | if (result != 1 || allow != 0) | |
331 | count = 0; | |
332 | } | |
333 | ||
334 | if (count == 0) { | |
335 | priv->flags.write_urb_in_use = 0; | |
336 | ||
337 | dbg("%s(): submitting interrupt urb", __FUNCTION__); | |
338 | port->interrupt_in_urb->dev = port->serial->dev; | |
339 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
340 | if (result != 0) { | |
341 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
342 | " with error %d\n", __FUNCTION__, result); | |
343 | } | |
344 | return; | |
345 | } | |
346 | ||
347 | spin_lock_irqsave(&priv->lock, flags); | |
348 | pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer, count); | |
349 | spin_unlock_irqrestore(&priv->lock, flags); | |
350 | ||
351 | port->write_urb->transfer_buffer_length = count; | |
352 | port->write_urb->dev = port->serial->dev; | |
353 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); | |
354 | if (result != 0) { | |
355 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
356 | " with error %d\n", __FUNCTION__, result); | |
357 | priv->flags.write_urb_in_use = 0; | |
358 | } | |
359 | ||
360 | usb_serial_port_softint(port); | |
361 | } | |
362 | ||
363 | static int oti6858_startup(struct usb_serial *serial) | |
364 | { | |
365 | struct usb_serial_port *port = serial->port[0]; | |
366 | struct oti6858_private *priv; | |
367 | int i; | |
368 | ||
369 | for (i = 0; i < serial->num_ports; ++i) { | |
370 | priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL); | |
371 | if (!priv) | |
372 | break; | |
373 | priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE); | |
374 | if (priv->buf == NULL) { | |
375 | kfree(priv); | |
376 | break; | |
377 | } | |
378 | ||
379 | spin_lock_init(&priv->lock); | |
380 | init_waitqueue_head(&priv->intr_wait); | |
381 | // INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); | |
382 | // INIT_WORK(&priv->write_work, send_data, serial->port[i]); | |
383 | priv->port = port; | |
384 | INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); | |
385 | INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); | |
386 | ||
387 | usb_set_serial_port_data(serial->port[i], priv); | |
388 | } | |
389 | if (i == serial->num_ports) | |
390 | return 0; | |
391 | ||
392 | for (--i; i >= 0; --i) { | |
393 | priv = usb_get_serial_port_data(serial->port[i]); | |
394 | pl2303_buf_free(priv->buf); | |
395 | kfree(priv); | |
396 | usb_set_serial_port_data(serial->port[i], NULL); | |
397 | } | |
398 | return -ENOMEM; | |
399 | } | |
400 | ||
401 | static int oti6858_write(struct usb_serial_port *port, | |
402 | const unsigned char *buf, int count) | |
403 | { | |
404 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
405 | unsigned long flags; | |
406 | ||
407 | dbg("%s(port = %d, count = %d)", __FUNCTION__, port->number, count); | |
408 | ||
409 | if (!count) | |
410 | return count; | |
411 | ||
412 | spin_lock_irqsave(&priv->lock, flags); | |
413 | count = pl2303_buf_put(priv->buf, buf, count); | |
414 | spin_unlock_irqrestore(&priv->lock, flags); | |
415 | ||
416 | return count; | |
417 | } | |
418 | ||
419 | static int oti6858_write_room(struct usb_serial_port *port) | |
420 | { | |
421 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
422 | int room = 0; | |
423 | unsigned long flags; | |
424 | ||
425 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
426 | ||
427 | spin_lock_irqsave(&priv->lock, flags); | |
428 | room = pl2303_buf_space_avail(priv->buf); | |
429 | spin_unlock_irqrestore(&priv->lock, flags); | |
430 | ||
431 | return room; | |
432 | } | |
433 | ||
434 | static int oti6858_chars_in_buffer(struct usb_serial_port *port) | |
435 | { | |
436 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
437 | int chars = 0; | |
438 | unsigned long flags; | |
439 | ||
440 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
441 | ||
442 | spin_lock_irqsave(&priv->lock, flags); | |
443 | chars = pl2303_buf_data_avail(priv->buf); | |
444 | spin_unlock_irqrestore(&priv->lock, flags); | |
445 | ||
446 | return chars; | |
447 | } | |
448 | ||
449 | static void oti6858_set_termios(struct usb_serial_port *port, | |
450 | struct ktermios *old_termios) | |
451 | { | |
452 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
453 | unsigned long flags; | |
454 | unsigned int cflag; | |
455 | u8 frame_fmt, control; | |
456 | u16 divisor; | |
457 | int br; | |
458 | ||
459 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
460 | ||
461 | if ((!port->tty) || (!port->tty->termios)) { | |
462 | dbg("%s(): no tty structures", __FUNCTION__); | |
463 | return; | |
464 | } | |
465 | ||
466 | spin_lock_irqsave(&priv->lock, flags); | |
467 | if (!priv->flags.termios_initialized) { | |
468 | *(port->tty->termios) = tty_std_termios; | |
469 | port->tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; | |
470 | priv->flags.termios_initialized = 1; | |
471 | } | |
472 | spin_unlock_irqrestore(&priv->lock, flags); | |
473 | ||
474 | cflag = port->tty->termios->c_cflag; | |
475 | ||
476 | spin_lock_irqsave(&priv->lock, flags); | |
477 | divisor = priv->pending_setup.divisor; | |
478 | frame_fmt = priv->pending_setup.frame_fmt; | |
479 | control = priv->pending_setup.control; | |
480 | spin_unlock_irqrestore(&priv->lock, flags); | |
481 | ||
482 | frame_fmt &= ~FMT_DATA_BITS_MASK; | |
483 | switch (cflag & CSIZE) { | |
484 | case CS5: | |
485 | frame_fmt |= FMT_DATA_BITS_5; | |
486 | break; | |
487 | case CS6: | |
488 | frame_fmt |= FMT_DATA_BITS_6; | |
489 | break; | |
490 | case CS7: | |
491 | frame_fmt |= FMT_DATA_BITS_7; | |
492 | break; | |
493 | default: | |
494 | case CS8: | |
495 | frame_fmt |= FMT_DATA_BITS_8; | |
496 | break; | |
497 | } | |
498 | ||
499 | /* manufacturer claims that this device can work with baud rates | |
500 | * up to 3 Mbps; I've tested it only on 115200 bps, so I can't | |
501 | * guarantee that any other baud rate will work (especially | |
502 | * the higher ones) | |
503 | */ | |
504 | br = tty_get_baud_rate(port->tty); | |
505 | if (br == 0) { | |
506 | divisor = 0; | |
507 | } else if (br <= OTI6858_MAX_BAUD_RATE) { | |
508 | int real_br; | |
509 | ||
510 | divisor = (96000000 + 8 * br) / (16 * br); | |
511 | real_br = 96000000 / (16 * divisor); | |
512 | if ((((real_br - br) * 100 + br - 1) / br) > 2) { | |
513 | dbg("%s(): baud rate %d is invalid", __FUNCTION__, br); | |
514 | return; | |
515 | } | |
516 | divisor = cpu_to_le16(divisor); | |
517 | } else { | |
518 | dbg("%s(): baud rate %d is too high", __FUNCTION__, br); | |
519 | return; | |
520 | } | |
521 | ||
522 | frame_fmt &= ~FMT_STOP_BITS_MASK; | |
523 | if ((cflag & CSTOPB) != 0) { | |
524 | frame_fmt |= FMT_STOP_BITS_2; | |
525 | } else { | |
526 | frame_fmt |= FMT_STOP_BITS_1; | |
527 | } | |
528 | ||
529 | frame_fmt &= ~FMT_PARITY_MASK; | |
530 | if ((cflag & PARENB) != 0) { | |
531 | if ((cflag & PARODD) != 0) { | |
532 | frame_fmt |= FMT_PARITY_ODD; | |
533 | } else { | |
534 | frame_fmt |= FMT_PARITY_EVEN; | |
535 | } | |
536 | } else { | |
537 | frame_fmt |= FMT_PARITY_NONE; | |
538 | } | |
539 | ||
540 | control &= ~CONTROL_MASK; | |
541 | if ((cflag & CRTSCTS) != 0) | |
542 | control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); | |
543 | ||
544 | /* change control lines if we are switching to or from B0 */ | |
545 | /* FIXME: | |
546 | spin_lock_irqsave(&priv->lock, flags); | |
547 | control = priv->line_control; | |
548 | if ((cflag & CBAUD) == B0) | |
549 | priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); | |
550 | else | |
551 | priv->line_control |= (CONTROL_DTR | CONTROL_RTS); | |
552 | if (control != priv->line_control) { | |
553 | control = priv->line_control; | |
554 | spin_unlock_irqrestore(&priv->lock, flags); | |
555 | set_control_lines(serial->dev, control); | |
556 | } else { | |
557 | spin_unlock_irqrestore(&priv->lock, flags); | |
558 | } | |
559 | */ | |
560 | ||
561 | spin_lock_irqsave(&priv->lock, flags); | |
562 | if (divisor != priv->pending_setup.divisor | |
563 | || control != priv->pending_setup.control | |
564 | || frame_fmt != priv->pending_setup.frame_fmt) { | |
565 | priv->pending_setup.divisor = divisor; | |
566 | priv->pending_setup.control = control; | |
567 | priv->pending_setup.frame_fmt = frame_fmt; | |
568 | } | |
569 | spin_unlock_irqrestore(&priv->lock, flags); | |
570 | } | |
571 | ||
572 | static int oti6858_open(struct usb_serial_port *port, struct file *filp) | |
573 | { | |
574 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
575 | struct ktermios tmp_termios; | |
576 | struct usb_serial *serial = port->serial; | |
577 | struct oti6858_control_pkt *buf; | |
578 | unsigned long flags; | |
579 | int result; | |
580 | ||
581 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
582 | ||
583 | usb_clear_halt(serial->dev, port->write_urb->pipe); | |
584 | usb_clear_halt(serial->dev, port->read_urb->pipe); | |
585 | ||
586 | if (port->open_count != 1) | |
587 | return 0; | |
588 | ||
589 | if ((buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == NULL) { | |
590 | dev_err(&port->dev, "%s(): out of memory!\n", __FUNCTION__); | |
591 | return -ENOMEM; | |
592 | } | |
593 | ||
594 | result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), | |
595 | OTI6858_REQ_T_GET_STATUS, | |
596 | OTI6858_REQ_GET_STATUS, | |
597 | 0, 0, | |
598 | buf, OTI6858_CTRL_PKT_SIZE, | |
599 | 100); | |
600 | if (result != OTI6858_CTRL_PKT_SIZE) { | |
601 | /* assume default (after power-on reset) values */ | |
602 | buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ | |
603 | buf->frame_fmt = 0x03; /* 8N1 */ | |
604 | buf->something = 0x43; | |
605 | buf->control = 0x4c; /* DTR, RTS */ | |
606 | buf->tx_status = 0x00; | |
607 | buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ | |
608 | buf->rx_bytes_avail = 0x00; | |
609 | } | |
610 | ||
611 | spin_lock_irqsave(&priv->lock, flags); | |
612 | memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); | |
613 | priv->pending_setup.divisor = buf->divisor; | |
614 | priv->pending_setup.frame_fmt = buf->frame_fmt; | |
615 | priv->pending_setup.control = buf->control; | |
616 | spin_unlock_irqrestore(&priv->lock, flags); | |
617 | kfree(buf); | |
618 | ||
619 | dbg("%s(): submitting interrupt urb", __FUNCTION__); | |
620 | port->interrupt_in_urb->dev = serial->dev; | |
621 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); | |
622 | if (result != 0) { | |
623 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
624 | " with error %d\n", __FUNCTION__, result); | |
625 | oti6858_close(port, NULL); | |
626 | return -EPROTO; | |
627 | } | |
628 | ||
629 | /* setup termios */ | |
630 | if (port->tty) | |
631 | oti6858_set_termios(port, &tmp_termios); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static void oti6858_close(struct usb_serial_port *port, struct file *filp) | |
637 | { | |
638 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
639 | unsigned long flags; | |
640 | long timeout; | |
641 | wait_queue_t wait; | |
642 | ||
643 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
644 | ||
645 | /* wait for data to drain from the buffer */ | |
646 | spin_lock_irqsave(&priv->lock, flags); | |
647 | timeout = 30 * HZ; /* PL2303_CLOSING_WAIT */ | |
648 | init_waitqueue_entry(&wait, current); | |
649 | add_wait_queue(&port->tty->write_wait, &wait); | |
650 | dbg("%s(): entering wait loop", __FUNCTION__); | |
651 | for (;;) { | |
652 | set_current_state(TASK_INTERRUPTIBLE); | |
653 | if (pl2303_buf_data_avail(priv->buf) == 0 | |
654 | || timeout == 0 || signal_pending(current) | |
655 | || !usb_get_intfdata(port->serial->interface)) /* disconnect */ | |
656 | break; | |
657 | spin_unlock_irqrestore(&priv->lock, flags); | |
658 | timeout = schedule_timeout(timeout); | |
659 | spin_lock_irqsave(&priv->lock, flags); | |
660 | } | |
661 | set_current_state(TASK_RUNNING); | |
662 | remove_wait_queue(&port->tty->write_wait, &wait); | |
663 | dbg("%s(): after wait loop", __FUNCTION__); | |
664 | ||
665 | /* clear out any remaining data in the buffer */ | |
666 | pl2303_buf_clear(priv->buf); | |
667 | spin_unlock_irqrestore(&priv->lock, flags); | |
668 | ||
669 | /* wait for characters to drain from the device */ | |
670 | /* (this is long enough for the entire 256 byte */ | |
671 | /* pl2303 hardware buffer to drain with no flow */ | |
672 | /* control for data rates of 1200 bps or more, */ | |
673 | /* for lower rates we should really know how much */ | |
674 | /* data is in the buffer to compute a delay */ | |
675 | /* that is not unnecessarily long) */ | |
676 | /* FIXME | |
677 | bps = tty_get_baud_rate(port->tty); | |
678 | if (bps > 1200) | |
679 | timeout = max((HZ*2560)/bps,HZ/10); | |
680 | else | |
681 | */ | |
682 | timeout = 2*HZ; | |
683 | schedule_timeout_interruptible(timeout); | |
684 | dbg("%s(): after schedule_timeout_interruptible()", __FUNCTION__); | |
685 | ||
686 | /* cancel scheduled setup */ | |
687 | cancel_delayed_work(&priv->delayed_setup_work); | |
688 | cancel_delayed_work(&priv->delayed_write_work); | |
689 | flush_scheduled_work(); | |
690 | ||
691 | /* shutdown our urbs */ | |
692 | dbg("%s(): shutting down urbs", __FUNCTION__); | |
693 | usb_kill_urb(port->write_urb); | |
694 | usb_kill_urb(port->read_urb); | |
695 | usb_kill_urb(port->interrupt_in_urb); | |
696 | ||
697 | /* | |
698 | if (port->tty && (port->tty->termios->c_cflag) & HUPCL) { | |
699 | // drop DTR and RTS | |
700 | spin_lock_irqsave(&priv->lock, flags); | |
701 | priv->pending_setup.control &= ~CONTROL_MASK; | |
702 | spin_unlock_irqrestore(&priv->lock, flags); | |
703 | } | |
704 | */ | |
705 | } | |
706 | ||
707 | static int oti6858_tiocmset(struct usb_serial_port *port, struct file *file, | |
708 | unsigned int set, unsigned int clear) | |
709 | { | |
710 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
711 | unsigned long flags; | |
712 | u8 control; | |
713 | ||
714 | dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)", | |
715 | __FUNCTION__, port->number, set, clear); | |
716 | ||
717 | if (!usb_get_intfdata(port->serial->interface)) | |
718 | return -ENODEV; | |
719 | ||
720 | /* FIXME: check if this is correct (active high/low) */ | |
721 | spin_lock_irqsave(&priv->lock, flags); | |
722 | control = priv->pending_setup.control; | |
723 | if ((set & TIOCM_RTS) != 0) | |
724 | control |= CONTROL_RTS_HIGH; | |
725 | if ((set & TIOCM_DTR) != 0) | |
726 | control |= CONTROL_DTR_HIGH; | |
727 | if ((clear & TIOCM_RTS) != 0) | |
728 | control &= ~CONTROL_RTS_HIGH; | |
729 | if ((clear & TIOCM_DTR) != 0) | |
730 | control &= ~CONTROL_DTR_HIGH; | |
731 | ||
732 | if (control != priv->pending_setup.control) { | |
733 | priv->pending_setup.control = control; | |
734 | } | |
735 | spin_unlock_irqrestore(&priv->lock, flags); | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static int oti6858_tiocmget(struct usb_serial_port *port, struct file *file) | |
741 | { | |
742 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
743 | unsigned long flags; | |
744 | unsigned pin_state; | |
745 | unsigned result = 0; | |
746 | ||
747 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
748 | ||
749 | if (!usb_get_intfdata(port->serial->interface)) | |
750 | return -ENODEV; | |
751 | ||
752 | spin_lock_irqsave(&priv->lock, flags); | |
753 | pin_state = priv->status.pin_state & PIN_MASK; | |
754 | spin_unlock_irqrestore(&priv->lock, flags); | |
755 | ||
756 | /* FIXME: check if this is correct (active high/low) */ | |
757 | if ((pin_state & PIN_RTS) != 0) | |
758 | result |= TIOCM_RTS; | |
759 | if ((pin_state & PIN_CTS) != 0) | |
760 | result |= TIOCM_CTS; | |
761 | if ((pin_state & PIN_DSR) != 0) | |
762 | result |= TIOCM_DSR; | |
763 | if ((pin_state & PIN_DTR) != 0) | |
764 | result |= TIOCM_DTR; | |
765 | if ((pin_state & PIN_RI) != 0) | |
766 | result |= TIOCM_RI; | |
767 | if ((pin_state & PIN_DCD) != 0) | |
768 | result |= TIOCM_CD; | |
769 | ||
770 | dbg("%s() = 0x%08x", __FUNCTION__, result); | |
771 | ||
772 | return result; | |
773 | } | |
774 | ||
775 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) | |
776 | { | |
777 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
778 | unsigned long flags; | |
779 | unsigned int prev, status; | |
780 | unsigned int changed; | |
781 | ||
782 | spin_lock_irqsave(&priv->lock, flags); | |
783 | prev = priv->status.pin_state; | |
784 | spin_unlock_irqrestore(&priv->lock, flags); | |
785 | ||
786 | while (1) { | |
787 | wait_event_interruptible(priv->intr_wait, priv->status.pin_state != prev); | |
788 | if (signal_pending(current)) | |
789 | return -ERESTARTSYS; | |
790 | ||
791 | spin_lock_irqsave(&priv->lock, flags); | |
792 | status = priv->status.pin_state & PIN_MASK; | |
793 | spin_unlock_irqrestore(&priv->lock, flags); | |
794 | ||
795 | changed = prev ^ status; | |
796 | /* FIXME: check if this is correct (active high/low) */ | |
797 | if ( ((arg & TIOCM_RNG) && (changed & PIN_RI)) || | |
798 | ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || | |
799 | ((arg & TIOCM_CD) && (changed & PIN_DCD)) || | |
800 | ((arg & TIOCM_CTS) && (changed & PIN_CTS))) { | |
801 | return 0; | |
802 | } | |
803 | prev = status; | |
804 | } | |
805 | ||
806 | /* NOTREACHED */ | |
807 | return 0; | |
808 | } | |
809 | ||
810 | static int oti6858_ioctl(struct usb_serial_port *port, struct file *file, | |
811 | unsigned int cmd, unsigned long arg) | |
812 | { | |
813 | void __user *user_arg = (void __user *) arg; | |
814 | unsigned int x; | |
815 | ||
816 | dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)", | |
817 | __FUNCTION__, port->number, cmd, arg); | |
818 | ||
819 | switch (cmd) { | |
49cdee0e KL |
820 | case TCFLSH: |
821 | /* FIXME */ | |
822 | return 0; | |
823 | ||
824 | case TIOCMBIS: | |
825 | if (copy_from_user(&x, user_arg, sizeof(x))) | |
826 | return -EFAULT; | |
827 | return oti6858_tiocmset(port, NULL, x, 0); | |
828 | ||
829 | case TIOCMBIC: | |
830 | if (copy_from_user(&x, user_arg, sizeof(x))) | |
831 | return -EFAULT; | |
832 | return oti6858_tiocmset(port, NULL, 0, x); | |
833 | ||
834 | case TIOCGSERIAL: | |
835 | if (copy_to_user(user_arg, port->tty->termios, | |
836 | sizeof(struct ktermios))) { | |
837 | return -EFAULT; | |
838 | } | |
839 | return 0; | |
840 | ||
841 | case TIOCSSERIAL: | |
842 | if (copy_from_user(port->tty->termios, user_arg, | |
843 | sizeof(struct ktermios))) { | |
844 | return -EFAULT; | |
845 | } | |
846 | oti6858_set_termios(port, NULL); | |
847 | return 0; | |
848 | ||
849 | case TIOCMIWAIT: | |
850 | dbg("%s(): TIOCMIWAIT", __FUNCTION__); | |
851 | return wait_modem_info(port, arg); | |
852 | ||
853 | default: | |
854 | dbg("%s(): 0x%04x not supported", __FUNCTION__, cmd); | |
855 | break; | |
856 | } | |
857 | ||
858 | return -ENOIOCTLCMD; | |
859 | } | |
860 | ||
861 | static void oti6858_break_ctl(struct usb_serial_port *port, int break_state) | |
862 | { | |
863 | int state; | |
864 | ||
865 | dbg("%s(port = %d)", __FUNCTION__, port->number); | |
866 | ||
867 | state = (break_state == 0) ? 0 : 1; | |
868 | dbg("%s(): turning break %s", __FUNCTION__, state ? "on" : "off"); | |
869 | ||
870 | /* FIXME */ | |
871 | /* | |
872 | result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0), | |
873 | BREAK_REQUEST, BREAK_REQUEST_TYPE, state, | |
874 | 0, NULL, 0, 100); | |
875 | if (result != 0) | |
876 | dbg("%s(): error sending break", __FUNCTION__); | |
877 | */ | |
878 | } | |
879 | ||
880 | static void oti6858_shutdown(struct usb_serial *serial) | |
881 | { | |
882 | struct oti6858_private *priv; | |
883 | int i; | |
884 | ||
885 | dbg("%s()", __FUNCTION__); | |
886 | ||
887 | for (i = 0; i < serial->num_ports; ++i) { | |
888 | priv = usb_get_serial_port_data(serial->port[i]); | |
889 | if (priv) { | |
890 | pl2303_buf_free(priv->buf); | |
891 | kfree(priv); | |
892 | usb_set_serial_port_data(serial->port[i], NULL); | |
893 | } | |
894 | } | |
895 | } | |
896 | ||
897 | static void oti6858_read_int_callback(struct urb *urb) | |
898 | { | |
899 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
900 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
901 | int transient = 0, can_recv = 0, resubmit = 1; | |
78c26aeb | 902 | int status = urb->status; |
49cdee0e | 903 | |
78c26aeb GKH |
904 | dbg("%s(port = %d, status = %d)", |
905 | __FUNCTION__, port->number, status); | |
49cdee0e | 906 | |
78c26aeb | 907 | switch (status) { |
49cdee0e KL |
908 | case 0: |
909 | /* success */ | |
910 | break; | |
911 | case -ECONNRESET: | |
912 | case -ENOENT: | |
913 | case -ESHUTDOWN: | |
914 | /* this urb is terminated, clean up */ | |
915 | dbg("%s(): urb shutting down with status: %d", | |
78c26aeb | 916 | __FUNCTION__, status); |
49cdee0e KL |
917 | return; |
918 | default: | |
919 | dbg("%s(): nonzero urb status received: %d", | |
78c26aeb | 920 | __FUNCTION__, status); |
49cdee0e KL |
921 | break; |
922 | } | |
923 | ||
78c26aeb | 924 | if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { |
49cdee0e KL |
925 | struct oti6858_control_pkt *xs = urb->transfer_buffer; |
926 | unsigned long flags; | |
927 | ||
928 | spin_lock_irqsave(&priv->lock, flags); | |
929 | ||
930 | if (!priv->transient) { | |
931 | if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { | |
932 | if (xs->rx_bytes_avail == 0) { | |
933 | priv->transient = 4; | |
934 | priv->setup_done = 0; | |
935 | resubmit = 0; | |
936 | dbg("%s(): scheduling setup_line()", | |
937 | __FUNCTION__); | |
938 | schedule_delayed_work(&priv->delayed_setup_work, 0); | |
939 | } | |
940 | } | |
941 | } else { | |
942 | if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { | |
943 | priv->transient = 0; | |
944 | } else if (!priv->setup_done) { | |
945 | resubmit = 0; | |
946 | } else if (--priv->transient == 0) { | |
947 | if (xs->rx_bytes_avail == 0) { | |
948 | priv->transient = 4; | |
949 | priv->setup_done = 0; | |
950 | resubmit = 0; | |
951 | dbg("%s(): scheduling setup_line()", | |
952 | __FUNCTION__); | |
953 | schedule_delayed_work(&priv->delayed_setup_work, 0); | |
954 | } | |
955 | } | |
956 | } | |
957 | ||
958 | if (!priv->transient) { | |
959 | if (xs->pin_state != priv->status.pin_state) | |
960 | wake_up_interruptible(&priv->intr_wait); | |
961 | memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); | |
962 | } | |
963 | ||
964 | if (!priv->transient && xs->rx_bytes_avail != 0) { | |
965 | can_recv = xs->rx_bytes_avail; | |
966 | priv->flags.read_urb_in_use = 1; | |
967 | } | |
968 | ||
969 | transient = priv->transient; | |
970 | spin_unlock_irqrestore(&priv->lock, flags); | |
971 | } | |
972 | ||
973 | if (can_recv) { | |
974 | int result; | |
975 | ||
976 | port->read_urb->dev = port->serial->dev; | |
977 | result = usb_submit_urb(port->read_urb, GFP_ATOMIC); | |
978 | if (result != 0) { | |
979 | priv->flags.read_urb_in_use = 0; | |
980 | dev_err(&port->dev, "%s(): usb_submit_urb() failed," | |
981 | " error %d\n", __FUNCTION__, result); | |
982 | } else { | |
983 | resubmit = 0; | |
984 | } | |
985 | } else if (!transient) { | |
986 | unsigned long flags; | |
987 | ||
988 | spin_lock_irqsave(&priv->lock, flags); | |
989 | if (priv->flags.write_urb_in_use == 0 | |
990 | && pl2303_buf_data_avail(priv->buf) != 0) { | |
991 | schedule_delayed_work(&priv->delayed_write_work,0); | |
992 | resubmit = 0; | |
993 | } | |
994 | spin_unlock_irqrestore(&priv->lock, flags); | |
995 | } | |
996 | ||
997 | if (resubmit) { | |
998 | int result; | |
999 | ||
1000 | // dbg("%s(): submitting interrupt urb", __FUNCTION__); | |
1001 | urb->dev = port->serial->dev; | |
1002 | result = usb_submit_urb(urb, GFP_ATOMIC); | |
1003 | if (result != 0) { | |
1004 | dev_err(&urb->dev->dev, | |
1005 | "%s(): usb_submit_urb() failed with" | |
1006 | " error %d\n", __FUNCTION__, result); | |
1007 | } | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | static void oti6858_read_bulk_callback(struct urb *urb) | |
1012 | { | |
1013 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
1014 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
1015 | struct tty_struct *tty; | |
1016 | unsigned char *data = urb->transfer_buffer; | |
1017 | unsigned long flags; | |
1018 | int i, result; | |
78c26aeb | 1019 | int status = urb->status; |
49cdee0e KL |
1020 | char tty_flag; |
1021 | ||
78c26aeb GKH |
1022 | dbg("%s(port = %d, status = %d)", |
1023 | __FUNCTION__, port->number, status); | |
49cdee0e KL |
1024 | |
1025 | spin_lock_irqsave(&priv->lock, flags); | |
1026 | priv->flags.read_urb_in_use = 0; | |
1027 | spin_unlock_irqrestore(&priv->lock, flags); | |
1028 | ||
78c26aeb | 1029 | if (status != 0) { |
49cdee0e KL |
1030 | if (!port->open_count) { |
1031 | dbg("%s(): port is closed, exiting", __FUNCTION__); | |
1032 | return; | |
1033 | } | |
1034 | /* | |
78c26aeb | 1035 | if (status == -EPROTO) { |
49cdee0e KL |
1036 | // PL2303 mysteriously fails with -EPROTO reschedule the read |
1037 | dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__); | |
49cdee0e KL |
1038 | result = usb_submit_urb(urb, GFP_ATOMIC); |
1039 | if (result) | |
1040 | dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); | |
1041 | return; | |
1042 | } | |
1043 | */ | |
1044 | dbg("%s(): unable to handle the error, exiting", __FUNCTION__); | |
1045 | return; | |
1046 | } | |
1047 | ||
1048 | // get tty_flag from status | |
1049 | tty_flag = TTY_NORMAL; | |
1050 | ||
1051 | /* FIXME: probably, errors will be signalled using interrupt pipe! */ | |
1052 | /* | |
1053 | // break takes precedence over parity, | |
1054 | // which takes precedence over framing errors | |
1055 | if (status & UART_BREAK_ERROR ) | |
1056 | tty_flag = TTY_BREAK; | |
1057 | else if (status & UART_PARITY_ERROR) | |
1058 | tty_flag = TTY_PARITY; | |
1059 | else if (status & UART_FRAME_ERROR) | |
1060 | tty_flag = TTY_FRAME; | |
1061 | dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag); | |
1062 | */ | |
1063 | ||
1064 | tty = port->tty; | |
1065 | if (tty != NULL && urb->actual_length > 0) { | |
1066 | tty_buffer_request_room(tty, urb->actual_length); | |
1067 | for (i = 0; i < urb->actual_length; ++i) | |
1068 | tty_insert_flip_char(tty, data[i], tty_flag); | |
1069 | tty_flip_buffer_push(tty); | |
1070 | } | |
1071 | ||
1072 | // schedule the interrupt urb if we are still open */ | |
1073 | if (port->open_count != 0) { | |
1074 | port->interrupt_in_urb->dev = port->serial->dev; | |
1075 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
1076 | if (result != 0) { | |
1077 | dev_err(&port->dev, "%s(): usb_submit_urb() failed," | |
1078 | " error %d\n", __FUNCTION__, result); | |
1079 | } | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | static void oti6858_write_bulk_callback(struct urb *urb) | |
1084 | { | |
1085 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; | |
1086 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
78c26aeb | 1087 | int status = urb->status; |
49cdee0e KL |
1088 | int result; |
1089 | ||
78c26aeb GKH |
1090 | dbg("%s(port = %d, status = %d)", |
1091 | __FUNCTION__, port->number, status); | |
49cdee0e | 1092 | |
78c26aeb | 1093 | switch (status) { |
49cdee0e KL |
1094 | case 0: |
1095 | /* success */ | |
1096 | break; | |
1097 | case -ECONNRESET: | |
1098 | case -ENOENT: | |
1099 | case -ESHUTDOWN: | |
1100 | /* this urb is terminated, clean up */ | |
1101 | dbg("%s(): urb shutting down with status: %d", | |
78c26aeb | 1102 | __FUNCTION__, status); |
49cdee0e KL |
1103 | priv->flags.write_urb_in_use = 0; |
1104 | return; | |
1105 | default: | |
1106 | /* error in the urb, so we have to resubmit it */ | |
1107 | dbg("%s(): nonzero write bulk status received: %d", | |
78c26aeb | 1108 | __FUNCTION__, status); |
49cdee0e KL |
1109 | dbg("%s(): overflow in write", __FUNCTION__); |
1110 | ||
1111 | port->write_urb->transfer_buffer_length = 1; | |
1112 | port->write_urb->dev = port->serial->dev; | |
1113 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); | |
1114 | if (result) { | |
1115 | dev_err(&port->dev, "%s(): usb_submit_urb() failed," | |
1116 | " error %d\n", __FUNCTION__, result); | |
1117 | } else { | |
1118 | return; | |
1119 | } | |
1120 | } | |
1121 | ||
1122 | priv->flags.write_urb_in_use = 0; | |
1123 | ||
1124 | // schedule the interrupt urb if we are still open */ | |
1125 | port->interrupt_in_urb->dev = port->serial->dev; | |
1126 | dbg("%s(): submitting interrupt urb", __FUNCTION__); | |
1127 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
1128 | if (result != 0) { | |
1129 | dev_err(&port->dev, "%s(): failed submitting int urb," | |
1130 | " error %d\n", __FUNCTION__, result); | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | ||
1135 | /* | |
1136 | * pl2303_buf_alloc | |
1137 | * | |
1138 | * Allocate a circular buffer and all associated memory. | |
1139 | */ | |
1140 | static struct pl2303_buf *pl2303_buf_alloc(unsigned int size) | |
1141 | { | |
1142 | struct pl2303_buf *pb; | |
1143 | ||
1144 | if (size == 0) | |
1145 | return NULL; | |
1146 | ||
b84d2bf0 | 1147 | pb = kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL); |
49cdee0e KL |
1148 | if (pb == NULL) |
1149 | return NULL; | |
1150 | ||
1151 | pb->buf_buf = kmalloc(size, GFP_KERNEL); | |
1152 | if (pb->buf_buf == NULL) { | |
1153 | kfree(pb); | |
1154 | return NULL; | |
1155 | } | |
1156 | ||
1157 | pb->buf_size = size; | |
1158 | pb->buf_get = pb->buf_put = pb->buf_buf; | |
1159 | ||
1160 | return pb; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * pl2303_buf_free | |
1165 | * | |
1166 | * Free the buffer and all associated memory. | |
1167 | */ | |
1168 | static void pl2303_buf_free(struct pl2303_buf *pb) | |
1169 | { | |
1170 | if (pb) { | |
1171 | kfree(pb->buf_buf); | |
1172 | kfree(pb); | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * pl2303_buf_clear | |
1178 | * | |
1179 | * Clear out all data in the circular buffer. | |
1180 | */ | |
1181 | static void pl2303_buf_clear(struct pl2303_buf *pb) | |
1182 | { | |
1183 | if (pb != NULL) { | |
1184 | /* equivalent to a get of all data available */ | |
1185 | pb->buf_get = pb->buf_put; | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * pl2303_buf_data_avail | |
1191 | * | |
1192 | * Return the number of bytes of data available in the circular | |
1193 | * buffer. | |
1194 | */ | |
1195 | static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb) | |
1196 | { | |
1197 | if (pb == NULL) | |
1198 | return 0; | |
1199 | return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size); | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * pl2303_buf_space_avail | |
1204 | * | |
1205 | * Return the number of bytes of space available in the circular | |
1206 | * buffer. | |
1207 | */ | |
1208 | static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb) | |
1209 | { | |
1210 | if (pb == NULL) | |
1211 | return 0; | |
1212 | return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size); | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * pl2303_buf_put | |
1217 | * | |
1218 | * Copy data data from a user buffer and put it into the circular buffer. | |
1219 | * Restrict to the amount of space available. | |
1220 | * | |
1221 | * Return the number of bytes copied. | |
1222 | */ | |
1223 | static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf, | |
1224 | unsigned int count) | |
1225 | { | |
1226 | unsigned int len; | |
1227 | ||
1228 | if (pb == NULL) | |
1229 | return 0; | |
1230 | ||
1231 | len = pl2303_buf_space_avail(pb); | |
1232 | if (count > len) | |
1233 | count = len; | |
1234 | ||
1235 | if (count == 0) | |
1236 | return 0; | |
1237 | ||
1238 | len = pb->buf_buf + pb->buf_size - pb->buf_put; | |
1239 | if (count > len) { | |
1240 | memcpy(pb->buf_put, buf, len); | |
1241 | memcpy(pb->buf_buf, buf+len, count - len); | |
1242 | pb->buf_put = pb->buf_buf + count - len; | |
1243 | } else { | |
1244 | memcpy(pb->buf_put, buf, count); | |
1245 | if (count < len) | |
1246 | pb->buf_put += count; | |
1247 | else /* count == len */ | |
1248 | pb->buf_put = pb->buf_buf; | |
1249 | } | |
1250 | ||
1251 | return count; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * pl2303_buf_get | |
1256 | * | |
1257 | * Get data from the circular buffer and copy to the given buffer. | |
1258 | * Restrict to the amount of data available. | |
1259 | * | |
1260 | * Return the number of bytes copied. | |
1261 | */ | |
1262 | static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf, | |
1263 | unsigned int count) | |
1264 | { | |
1265 | unsigned int len; | |
1266 | ||
1267 | if (pb == NULL) | |
1268 | return 0; | |
1269 | ||
1270 | len = pl2303_buf_data_avail(pb); | |
1271 | if (count > len) | |
1272 | count = len; | |
1273 | ||
1274 | if (count == 0) | |
1275 | return 0; | |
1276 | ||
1277 | len = pb->buf_buf + pb->buf_size - pb->buf_get; | |
1278 | if (count > len) { | |
1279 | memcpy(buf, pb->buf_get, len); | |
1280 | memcpy(buf+len, pb->buf_buf, count - len); | |
1281 | pb->buf_get = pb->buf_buf + count - len; | |
1282 | } else { | |
1283 | memcpy(buf, pb->buf_get, count); | |
1284 | if (count < len) | |
1285 | pb->buf_get += count; | |
1286 | else /* count == len */ | |
1287 | pb->buf_get = pb->buf_buf; | |
1288 | } | |
1289 | ||
1290 | return count; | |
1291 | } | |
1292 | ||
1293 | /* module description and (de)initialization */ | |
1294 | ||
1295 | static int __init oti6858_init(void) | |
1296 | { | |
1297 | int retval; | |
1298 | ||
1299 | if ((retval = usb_serial_register(&oti6858_device)) == 0) { | |
1300 | if ((retval = usb_register(&oti6858_driver)) != 0) | |
1301 | usb_serial_deregister(&oti6858_device); | |
1302 | else | |
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | return retval; | |
1307 | } | |
1308 | ||
1309 | static void __exit oti6858_exit(void) | |
1310 | { | |
1311 | usb_deregister(&oti6858_driver); | |
1312 | usb_serial_deregister(&oti6858_device); | |
1313 | } | |
1314 | ||
1315 | module_init(oti6858_init); | |
1316 | module_exit(oti6858_exit); | |
1317 | ||
1318 | MODULE_DESCRIPTION(OTI6858_DESCRIPTION); | |
1319 | MODULE_AUTHOR(OTI6858_AUTHOR); | |
1320 | MODULE_VERSION(OTI6858_VERSION); | |
1321 | MODULE_LICENSE("GPL"); | |
1322 | ||
1323 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
1324 | MODULE_PARM_DESC(debug, "enable debug output"); | |
1325 |