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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 | * | |
2a77c814 AC |
28 | * See Documentation/usb/usb-serial.txt for more information on using this |
29 | * driver | |
49cdee0e KL |
30 | * |
31 | * TODO: | |
32 | * - implement correct flushing for ioctls and oti6858_close() | |
33 | * - check how errors (rx overflow, parity error, framing error) are reported | |
34 | * - implement oti6858_break_ctl() | |
35 | * - implement more ioctls | |
36 | * - test/implement flow control | |
37 | * - allow setting custom baud rates | |
38 | */ | |
39 | ||
40 | #include <linux/kernel.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/tty.h> | |
45 | #include <linux/tty_driver.h> | |
46 | #include <linux/tty_flip.h> | |
47 | #include <linux/serial.h> | |
48 | #include <linux/module.h> | |
49 | #include <linux/moduleparam.h> | |
50 | #include <linux/spinlock.h> | |
51 | #include <linux/usb.h> | |
52 | #include <linux/usb/serial.h> | |
2a77c814 | 53 | #include <linux/uaccess.h> |
49cdee0e KL |
54 | #include "oti6858.h" |
55 | ||
56 | #define OTI6858_DESCRIPTION \ | |
57 | "Ours Technology Inc. OTi-6858 USB to serial adapter driver" | |
58 | #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>" | |
59 | #define OTI6858_VERSION "0.1" | |
60 | ||
61 | static struct usb_device_id id_table [] = { | |
62 | { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, | |
63 | { } | |
64 | }; | |
65 | ||
66 | MODULE_DEVICE_TABLE(usb, id_table); | |
67 | ||
68 | static struct usb_driver oti6858_driver = { | |
69 | .name = "oti6858", | |
70 | .probe = usb_serial_probe, | |
71 | .disconnect = usb_serial_disconnect, | |
72 | .id_table = id_table, | |
73 | .no_dynamic_id = 1, | |
74 | }; | |
75 | ||
76 | static int debug; | |
77 | ||
78 | ||
79 | /* buffering code, copied from pl2303 driver */ | |
80 | #define PL2303_BUF_SIZE 1024 | |
81 | #define PL2303_TMP_BUF_SIZE 1024 | |
82 | ||
b0a239da | 83 | struct oti6858_buf { |
49cdee0e KL |
84 | unsigned int buf_size; |
85 | char *buf_buf; | |
86 | char *buf_get; | |
87 | char *buf_put; | |
88 | }; | |
89 | ||
90 | /* requests */ | |
91 | #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) | |
92 | #define OTI6858_REQ_T_GET_STATUS 0x01 | |
93 | ||
94 | #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) | |
95 | #define OTI6858_REQ_T_SET_LINE 0x00 | |
96 | ||
97 | #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) | |
98 | #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 | |
99 | ||
100 | /* format of the control packet */ | |
101 | struct oti6858_control_pkt { | |
fd05e720 | 102 | __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ |
49cdee0e KL |
103 | #define OTI6858_MAX_BAUD_RATE 3000000 |
104 | u8 frame_fmt; | |
105 | #define FMT_STOP_BITS_MASK 0xc0 | |
106 | #define FMT_STOP_BITS_1 0x00 | |
107 | #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ | |
108 | #define FMT_PARITY_MASK 0x38 | |
109 | #define FMT_PARITY_NONE 0x00 | |
110 | #define FMT_PARITY_ODD 0x08 | |
111 | #define FMT_PARITY_EVEN 0x18 | |
112 | #define FMT_PARITY_MARK 0x28 | |
113 | #define FMT_PARITY_SPACE 0x38 | |
114 | #define FMT_DATA_BITS_MASK 0x03 | |
115 | #define FMT_DATA_BITS_5 0x00 | |
116 | #define FMT_DATA_BITS_6 0x01 | |
117 | #define FMT_DATA_BITS_7 0x02 | |
118 | #define FMT_DATA_BITS_8 0x03 | |
119 | u8 something; /* always equals 0x43 */ | |
120 | u8 control; /* settings of flow control lines */ | |
121 | #define CONTROL_MASK 0x0c | |
122 | #define CONTROL_DTR_HIGH 0x08 | |
123 | #define CONTROL_RTS_HIGH 0x04 | |
124 | u8 tx_status; | |
125 | #define TX_BUFFER_EMPTIED 0x09 | |
126 | u8 pin_state; | |
127 | #define PIN_MASK 0x3f | |
128 | #define PIN_RTS 0x20 /* output pin */ | |
129 | #define PIN_CTS 0x10 /* input pin, active low */ | |
130 | #define PIN_DSR 0x08 /* input pin, active low */ | |
131 | #define PIN_DTR 0x04 /* output pin */ | |
132 | #define PIN_RI 0x02 /* input pin, active low */ | |
133 | #define PIN_DCD 0x01 /* input pin, active low */ | |
134 | u8 rx_bytes_avail; /* number of bytes in rx buffer */; | |
135 | }; | |
136 | ||
137 | #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) | |
138 | #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ | |
2a77c814 | 139 | (((a)->divisor == (priv)->pending_setup.divisor) \ |
49cdee0e | 140 | && ((a)->control == (priv)->pending_setup.control) \ |
2a77c814 | 141 | && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) |
49cdee0e KL |
142 | |
143 | /* function prototypes */ | |
a509a7e4 | 144 | static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); |
335f8514 | 145 | static void oti6858_close(struct usb_serial_port *port); |
95da310e AC |
146 | static void oti6858_set_termios(struct tty_struct *tty, |
147 | struct usb_serial_port *port, struct ktermios *old); | |
148 | static int oti6858_ioctl(struct tty_struct *tty, struct file *file, | |
49cdee0e KL |
149 | unsigned int cmd, unsigned long arg); |
150 | static void oti6858_read_int_callback(struct urb *urb); | |
151 | static void oti6858_read_bulk_callback(struct urb *urb); | |
152 | static void oti6858_write_bulk_callback(struct urb *urb); | |
95da310e | 153 | static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, |
49cdee0e | 154 | const unsigned char *buf, int count); |
95da310e AC |
155 | static int oti6858_write_room(struct tty_struct *tty); |
156 | static int oti6858_chars_in_buffer(struct tty_struct *tty); | |
157 | static int oti6858_tiocmget(struct tty_struct *tty, struct file *file); | |
158 | static int oti6858_tiocmset(struct tty_struct *tty, struct file *file, | |
49cdee0e KL |
159 | unsigned int set, unsigned int clear); |
160 | static int oti6858_startup(struct usb_serial *serial); | |
f9c99bb8 | 161 | static void oti6858_release(struct usb_serial *serial); |
49cdee0e KL |
162 | |
163 | /* functions operating on buffers */ | |
b0a239da AC |
164 | static struct oti6858_buf *oti6858_buf_alloc(unsigned int size); |
165 | static void oti6858_buf_free(struct oti6858_buf *pb); | |
166 | static void oti6858_buf_clear(struct oti6858_buf *pb); | |
167 | static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb); | |
168 | static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb); | |
169 | static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf, | |
49cdee0e | 170 | unsigned int count); |
b0a239da | 171 | static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf, |
49cdee0e KL |
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, | |
49cdee0e KL |
182 | .num_ports = 1, |
183 | .open = oti6858_open, | |
184 | .close = oti6858_close, | |
185 | .write = oti6858_write, | |
186 | .ioctl = oti6858_ioctl, | |
49cdee0e KL |
187 | .set_termios = oti6858_set_termios, |
188 | .tiocmget = oti6858_tiocmget, | |
189 | .tiocmset = oti6858_tiocmset, | |
190 | .read_bulk_callback = oti6858_read_bulk_callback, | |
191 | .read_int_callback = oti6858_read_int_callback, | |
192 | .write_bulk_callback = oti6858_write_bulk_callback, | |
193 | .write_room = oti6858_write_room, | |
194 | .chars_in_buffer = oti6858_chars_in_buffer, | |
195 | .attach = oti6858_startup, | |
f9c99bb8 | 196 | .release = oti6858_release, |
49cdee0e KL |
197 | }; |
198 | ||
199 | struct oti6858_private { | |
200 | spinlock_t lock; | |
201 | ||
b0a239da | 202 | struct oti6858_buf *buf; |
49cdee0e KL |
203 | struct oti6858_control_pkt status; |
204 | ||
205 | struct { | |
206 | u8 read_urb_in_use; | |
207 | u8 write_urb_in_use; | |
208 | u8 termios_initialized; | |
209 | } flags; | |
210 | struct delayed_work delayed_write_work; | |
211 | ||
212 | struct { | |
fd05e720 | 213 | __le16 divisor; |
49cdee0e KL |
214 | u8 frame_fmt; |
215 | u8 control; | |
216 | } pending_setup; | |
217 | u8 transient; | |
218 | u8 setup_done; | |
219 | struct delayed_work delayed_setup_work; | |
220 | ||
221 | wait_queue_head_t intr_wait; | |
2a77c814 | 222 | struct usb_serial_port *port; /* USB port with which associated */ |
49cdee0e KL |
223 | }; |
224 | ||
49cdee0e KL |
225 | static void setup_line(struct work_struct *work) |
226 | { | |
2a77c814 AC |
227 | struct oti6858_private *priv = container_of(work, |
228 | struct oti6858_private, delayed_setup_work.work); | |
49cdee0e KL |
229 | struct usb_serial_port *port = priv->port; |
230 | struct oti6858_control_pkt *new_setup; | |
231 | unsigned long flags; | |
232 | int result; | |
233 | ||
441b62c1 | 234 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e | 235 | |
2a77c814 AC |
236 | new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); |
237 | if (new_setup == NULL) { | |
441b62c1 | 238 | dev_err(&port->dev, "%s(): out of memory!\n", __func__); |
49cdee0e | 239 | /* we will try again */ |
2a77c814 AC |
240 | schedule_delayed_work(&priv->delayed_setup_work, |
241 | msecs_to_jiffies(2)); | |
49cdee0e KL |
242 | return; |
243 | } | |
244 | ||
245 | result = usb_control_msg(port->serial->dev, | |
246 | usb_rcvctrlpipe(port->serial->dev, 0), | |
247 | OTI6858_REQ_T_GET_STATUS, | |
248 | OTI6858_REQ_GET_STATUS, | |
249 | 0, 0, | |
250 | new_setup, OTI6858_CTRL_PKT_SIZE, | |
251 | 100); | |
252 | ||
253 | if (result != OTI6858_CTRL_PKT_SIZE) { | |
441b62c1 | 254 | dev_err(&port->dev, "%s(): error reading status\n", __func__); |
49cdee0e KL |
255 | kfree(new_setup); |
256 | /* we will try again */ | |
2a77c814 AC |
257 | schedule_delayed_work(&priv->delayed_setup_work, |
258 | msecs_to_jiffies(2)); | |
49cdee0e KL |
259 | return; |
260 | } | |
261 | ||
262 | spin_lock_irqsave(&priv->lock, flags); | |
263 | if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { | |
264 | new_setup->divisor = priv->pending_setup.divisor; | |
265 | new_setup->control = priv->pending_setup.control; | |
266 | new_setup->frame_fmt = priv->pending_setup.frame_fmt; | |
267 | ||
268 | spin_unlock_irqrestore(&priv->lock, flags); | |
269 | result = usb_control_msg(port->serial->dev, | |
270 | usb_sndctrlpipe(port->serial->dev, 0), | |
271 | OTI6858_REQ_T_SET_LINE, | |
272 | OTI6858_REQ_SET_LINE, | |
273 | 0, 0, | |
274 | new_setup, OTI6858_CTRL_PKT_SIZE, | |
275 | 100); | |
276 | } else { | |
277 | spin_unlock_irqrestore(&priv->lock, flags); | |
278 | result = 0; | |
279 | } | |
280 | kfree(new_setup); | |
281 | ||
282 | spin_lock_irqsave(&priv->lock, flags); | |
283 | if (result != OTI6858_CTRL_PKT_SIZE) | |
284 | priv->transient = 0; | |
285 | priv->setup_done = 1; | |
286 | spin_unlock_irqrestore(&priv->lock, flags); | |
287 | ||
441b62c1 | 288 | dbg("%s(): submitting interrupt urb", __func__); |
49cdee0e KL |
289 | port->interrupt_in_urb->dev = port->serial->dev; |
290 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
291 | if (result != 0) { | |
292 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
441b62c1 | 293 | " with error %d\n", __func__, result); |
49cdee0e KL |
294 | } |
295 | } | |
296 | ||
297 | void send_data(struct work_struct *work) | |
298 | { | |
2a77c814 AC |
299 | struct oti6858_private *priv = container_of(work, |
300 | struct oti6858_private, delayed_write_work.work); | |
49cdee0e KL |
301 | struct usb_serial_port *port = priv->port; |
302 | int count = 0, result; | |
303 | unsigned long flags; | |
304 | unsigned char allow; | |
305 | ||
441b62c1 | 306 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e KL |
307 | |
308 | spin_lock_irqsave(&priv->lock, flags); | |
309 | if (priv->flags.write_urb_in_use) { | |
310 | spin_unlock_irqrestore(&priv->lock, flags); | |
2a77c814 AC |
311 | schedule_delayed_work(&priv->delayed_write_work, |
312 | msecs_to_jiffies(2)); | |
49cdee0e KL |
313 | return; |
314 | } | |
315 | priv->flags.write_urb_in_use = 1; | |
316 | ||
b0a239da | 317 | count = oti6858_buf_data_avail(priv->buf); |
49cdee0e KL |
318 | spin_unlock_irqrestore(&priv->lock, flags); |
319 | if (count > port->bulk_out_size) | |
320 | count = port->bulk_out_size; | |
321 | ||
322 | if (count != 0) { | |
323 | result = usb_control_msg(port->serial->dev, | |
324 | usb_rcvctrlpipe(port->serial->dev, 0), | |
325 | OTI6858_REQ_T_CHECK_TXBUFF, | |
326 | OTI6858_REQ_CHECK_TXBUFF, | |
327 | count, 0, &allow, 1, 100); | |
328 | if (result != 1 || allow != 0) | |
329 | count = 0; | |
330 | } | |
331 | ||
332 | if (count == 0) { | |
333 | priv->flags.write_urb_in_use = 0; | |
334 | ||
441b62c1 | 335 | dbg("%s(): submitting interrupt urb", __func__); |
49cdee0e KL |
336 | port->interrupt_in_urb->dev = port->serial->dev; |
337 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
338 | if (result != 0) { | |
339 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
441b62c1 | 340 | " with error %d\n", __func__, result); |
49cdee0e KL |
341 | } |
342 | return; | |
343 | } | |
344 | ||
345 | spin_lock_irqsave(&priv->lock, flags); | |
b0a239da | 346 | oti6858_buf_get(priv->buf, port->write_urb->transfer_buffer, count); |
49cdee0e KL |
347 | spin_unlock_irqrestore(&priv->lock, flags); |
348 | ||
349 | port->write_urb->transfer_buffer_length = count; | |
350 | port->write_urb->dev = port->serial->dev; | |
351 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); | |
352 | if (result != 0) { | |
353 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
441b62c1 | 354 | " with error %d\n", __func__, result); |
49cdee0e KL |
355 | priv->flags.write_urb_in_use = 0; |
356 | } | |
357 | ||
358 | usb_serial_port_softint(port); | |
359 | } | |
360 | ||
361 | static int oti6858_startup(struct usb_serial *serial) | |
362 | { | |
2a77c814 AC |
363 | struct usb_serial_port *port = serial->port[0]; |
364 | struct oti6858_private *priv; | |
49cdee0e KL |
365 | int i; |
366 | ||
367 | for (i = 0; i < serial->num_ports; ++i) { | |
368 | priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL); | |
369 | if (!priv) | |
370 | break; | |
b0a239da | 371 | priv->buf = oti6858_buf_alloc(PL2303_BUF_SIZE); |
49cdee0e KL |
372 | if (priv->buf == NULL) { |
373 | kfree(priv); | |
374 | break; | |
375 | } | |
376 | ||
377 | spin_lock_init(&priv->lock); | |
378 | init_waitqueue_head(&priv->intr_wait); | |
2a77c814 AC |
379 | /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */ |
380 | /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */ | |
49cdee0e KL |
381 | priv->port = port; |
382 | INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); | |
383 | INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); | |
384 | ||
385 | usb_set_serial_port_data(serial->port[i], priv); | |
386 | } | |
387 | if (i == serial->num_ports) | |
388 | return 0; | |
389 | ||
390 | for (--i; i >= 0; --i) { | |
391 | priv = usb_get_serial_port_data(serial->port[i]); | |
b0a239da | 392 | oti6858_buf_free(priv->buf); |
49cdee0e KL |
393 | kfree(priv); |
394 | usb_set_serial_port_data(serial->port[i], NULL); | |
395 | } | |
396 | return -ENOMEM; | |
397 | } | |
398 | ||
95da310e | 399 | static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, |
49cdee0e KL |
400 | const unsigned char *buf, int count) |
401 | { | |
402 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
403 | unsigned long flags; | |
404 | ||
441b62c1 | 405 | dbg("%s(port = %d, count = %d)", __func__, port->number, count); |
49cdee0e KL |
406 | |
407 | if (!count) | |
408 | return count; | |
409 | ||
410 | spin_lock_irqsave(&priv->lock, flags); | |
b0a239da | 411 | count = oti6858_buf_put(priv->buf, buf, count); |
49cdee0e KL |
412 | spin_unlock_irqrestore(&priv->lock, flags); |
413 | ||
414 | return count; | |
415 | } | |
416 | ||
95da310e | 417 | static int oti6858_write_room(struct tty_struct *tty) |
49cdee0e | 418 | { |
95da310e | 419 | struct usb_serial_port *port = tty->driver_data; |
49cdee0e KL |
420 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
421 | int room = 0; | |
422 | unsigned long flags; | |
423 | ||
441b62c1 | 424 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e KL |
425 | |
426 | spin_lock_irqsave(&priv->lock, flags); | |
b0a239da | 427 | room = oti6858_buf_space_avail(priv->buf); |
49cdee0e KL |
428 | spin_unlock_irqrestore(&priv->lock, flags); |
429 | ||
430 | return room; | |
431 | } | |
432 | ||
95da310e | 433 | static int oti6858_chars_in_buffer(struct tty_struct *tty) |
49cdee0e | 434 | { |
95da310e | 435 | struct usb_serial_port *port = tty->driver_data; |
49cdee0e KL |
436 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
437 | int chars = 0; | |
438 | unsigned long flags; | |
439 | ||
441b62c1 | 440 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e KL |
441 | |
442 | spin_lock_irqsave(&priv->lock, flags); | |
b0a239da | 443 | chars = oti6858_buf_data_avail(priv->buf); |
49cdee0e KL |
444 | spin_unlock_irqrestore(&priv->lock, flags); |
445 | ||
446 | return chars; | |
447 | } | |
448 | ||
95da310e AC |
449 | static void oti6858_set_termios(struct tty_struct *tty, |
450 | struct usb_serial_port *port, struct ktermios *old_termios) | |
49cdee0e KL |
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; | |
fd05e720 | 456 | __le16 divisor; |
49cdee0e KL |
457 | int br; |
458 | ||
441b62c1 | 459 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e | 460 | |
95da310e | 461 | if (!tty) { |
441b62c1 | 462 | dbg("%s(): no tty structures", __func__); |
49cdee0e KL |
463 | return; |
464 | } | |
465 | ||
466 | spin_lock_irqsave(&priv->lock, flags); | |
467 | if (!priv->flags.termios_initialized) { | |
95da310e AC |
468 | *(tty->termios) = tty_std_termios; |
469 | tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; | |
470 | tty->termios->c_ispeed = 38400; | |
471 | tty->termios->c_ospeed = 38400; | |
49cdee0e KL |
472 | priv->flags.termios_initialized = 1; |
473 | } | |
474 | spin_unlock_irqrestore(&priv->lock, flags); | |
475 | ||
95da310e | 476 | cflag = tty->termios->c_cflag; |
49cdee0e KL |
477 | |
478 | spin_lock_irqsave(&priv->lock, flags); | |
479 | divisor = priv->pending_setup.divisor; | |
480 | frame_fmt = priv->pending_setup.frame_fmt; | |
481 | control = priv->pending_setup.control; | |
482 | spin_unlock_irqrestore(&priv->lock, flags); | |
483 | ||
484 | frame_fmt &= ~FMT_DATA_BITS_MASK; | |
485 | switch (cflag & CSIZE) { | |
2a77c814 AC |
486 | case CS5: |
487 | frame_fmt |= FMT_DATA_BITS_5; | |
488 | break; | |
489 | case CS6: | |
490 | frame_fmt |= FMT_DATA_BITS_6; | |
491 | break; | |
492 | case CS7: | |
493 | frame_fmt |= FMT_DATA_BITS_7; | |
494 | break; | |
495 | default: | |
496 | case CS8: | |
497 | frame_fmt |= FMT_DATA_BITS_8; | |
498 | break; | |
49cdee0e KL |
499 | } |
500 | ||
501 | /* manufacturer claims that this device can work with baud rates | |
502 | * up to 3 Mbps; I've tested it only on 115200 bps, so I can't | |
503 | * guarantee that any other baud rate will work (especially | |
504 | * the higher ones) | |
505 | */ | |
95da310e | 506 | br = tty_get_baud_rate(tty); |
49cdee0e KL |
507 | if (br == 0) { |
508 | divisor = 0; | |
b0a239da | 509 | } else { |
49cdee0e | 510 | int real_br; |
fd05e720 | 511 | int new_divisor; |
b0a239da | 512 | br = min(br, OTI6858_MAX_BAUD_RATE); |
49cdee0e | 513 | |
fd05e720 AV |
514 | new_divisor = (96000000 + 8 * br) / (16 * br); |
515 | real_br = 96000000 / (16 * new_divisor); | |
516 | divisor = cpu_to_le16(new_divisor); | |
95da310e | 517 | tty_encode_baud_rate(tty, real_br, real_br); |
49cdee0e KL |
518 | } |
519 | ||
520 | frame_fmt &= ~FMT_STOP_BITS_MASK; | |
2a77c814 | 521 | if ((cflag & CSTOPB) != 0) |
49cdee0e | 522 | frame_fmt |= FMT_STOP_BITS_2; |
2a77c814 | 523 | else |
49cdee0e | 524 | frame_fmt |= FMT_STOP_BITS_1; |
49cdee0e KL |
525 | |
526 | frame_fmt &= ~FMT_PARITY_MASK; | |
527 | if ((cflag & PARENB) != 0) { | |
2a77c814 | 528 | if ((cflag & PARODD) != 0) |
49cdee0e | 529 | frame_fmt |= FMT_PARITY_ODD; |
2a77c814 | 530 | else |
49cdee0e | 531 | frame_fmt |= FMT_PARITY_EVEN; |
49cdee0e KL |
532 | } else { |
533 | frame_fmt |= FMT_PARITY_NONE; | |
534 | } | |
535 | ||
536 | control &= ~CONTROL_MASK; | |
537 | if ((cflag & CRTSCTS) != 0) | |
538 | control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); | |
539 | ||
540 | /* change control lines if we are switching to or from B0 */ | |
541 | /* FIXME: | |
542 | spin_lock_irqsave(&priv->lock, flags); | |
543 | control = priv->line_control; | |
544 | if ((cflag & CBAUD) == B0) | |
545 | priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); | |
546 | else | |
547 | priv->line_control |= (CONTROL_DTR | CONTROL_RTS); | |
548 | if (control != priv->line_control) { | |
549 | control = priv->line_control; | |
550 | spin_unlock_irqrestore(&priv->lock, flags); | |
551 | set_control_lines(serial->dev, control); | |
552 | } else { | |
553 | spin_unlock_irqrestore(&priv->lock, flags); | |
554 | } | |
555 | */ | |
556 | ||
557 | spin_lock_irqsave(&priv->lock, flags); | |
558 | if (divisor != priv->pending_setup.divisor | |
559 | || control != priv->pending_setup.control | |
560 | || frame_fmt != priv->pending_setup.frame_fmt) { | |
561 | priv->pending_setup.divisor = divisor; | |
562 | priv->pending_setup.control = control; | |
563 | priv->pending_setup.frame_fmt = frame_fmt; | |
564 | } | |
565 | spin_unlock_irqrestore(&priv->lock, flags); | |
566 | } | |
567 | ||
a509a7e4 | 568 | static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) |
49cdee0e KL |
569 | { |
570 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
571 | struct ktermios tmp_termios; | |
572 | struct usb_serial *serial = port->serial; | |
573 | struct oti6858_control_pkt *buf; | |
574 | unsigned long flags; | |
575 | int result; | |
576 | ||
441b62c1 | 577 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e KL |
578 | |
579 | usb_clear_halt(serial->dev, port->write_urb->pipe); | |
580 | usb_clear_halt(serial->dev, port->read_urb->pipe); | |
581 | ||
95da310e | 582 | if (port->port.count != 1) |
49cdee0e KL |
583 | return 0; |
584 | ||
2a77c814 AC |
585 | buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); |
586 | if (buf == NULL) { | |
441b62c1 | 587 | dev_err(&port->dev, "%s(): out of memory!\n", __func__); |
49cdee0e KL |
588 | return -ENOMEM; |
589 | } | |
590 | ||
591 | result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), | |
592 | OTI6858_REQ_T_GET_STATUS, | |
593 | OTI6858_REQ_GET_STATUS, | |
594 | 0, 0, | |
595 | buf, OTI6858_CTRL_PKT_SIZE, | |
596 | 100); | |
597 | if (result != OTI6858_CTRL_PKT_SIZE) { | |
598 | /* assume default (after power-on reset) values */ | |
599 | buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ | |
600 | buf->frame_fmt = 0x03; /* 8N1 */ | |
601 | buf->something = 0x43; | |
602 | buf->control = 0x4c; /* DTR, RTS */ | |
603 | buf->tx_status = 0x00; | |
604 | buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ | |
605 | buf->rx_bytes_avail = 0x00; | |
606 | } | |
607 | ||
608 | spin_lock_irqsave(&priv->lock, flags); | |
609 | memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); | |
610 | priv->pending_setup.divisor = buf->divisor; | |
611 | priv->pending_setup.frame_fmt = buf->frame_fmt; | |
612 | priv->pending_setup.control = buf->control; | |
613 | spin_unlock_irqrestore(&priv->lock, flags); | |
614 | kfree(buf); | |
615 | ||
441b62c1 | 616 | dbg("%s(): submitting interrupt urb", __func__); |
49cdee0e KL |
617 | port->interrupt_in_urb->dev = serial->dev; |
618 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); | |
619 | if (result != 0) { | |
620 | dev_err(&port->dev, "%s(): usb_submit_urb() failed" | |
441b62c1 | 621 | " with error %d\n", __func__, result); |
335f8514 | 622 | oti6858_close(port); |
49cdee0e KL |
623 | return -EPROTO; |
624 | } | |
625 | ||
626 | /* setup termios */ | |
95da310e AC |
627 | if (tty) |
628 | oti6858_set_termios(tty, port, &tmp_termios); | |
335f8514 | 629 | port->port.drain_delay = 256; /* FIXME: check the FIFO length */ |
49cdee0e KL |
630 | return 0; |
631 | } | |
632 | ||
335f8514 | 633 | static void oti6858_close(struct usb_serial_port *port) |
49cdee0e KL |
634 | { |
635 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
636 | unsigned long flags; | |
49cdee0e | 637 | |
441b62c1 | 638 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e | 639 | |
49cdee0e | 640 | spin_lock_irqsave(&priv->lock, flags); |
49cdee0e | 641 | /* clear out any remaining data in the buffer */ |
b0a239da | 642 | oti6858_buf_clear(priv->buf); |
49cdee0e KL |
643 | spin_unlock_irqrestore(&priv->lock, flags); |
644 | ||
335f8514 | 645 | dbg("%s(): after buf_clear()", __func__); |
49cdee0e KL |
646 | |
647 | /* cancel scheduled setup */ | |
648 | cancel_delayed_work(&priv->delayed_setup_work); | |
649 | cancel_delayed_work(&priv->delayed_write_work); | |
650 | flush_scheduled_work(); | |
651 | ||
652 | /* shutdown our urbs */ | |
441b62c1 | 653 | dbg("%s(): shutting down urbs", __func__); |
49cdee0e KL |
654 | usb_kill_urb(port->write_urb); |
655 | usb_kill_urb(port->read_urb); | |
656 | usb_kill_urb(port->interrupt_in_urb); | |
49cdee0e KL |
657 | } |
658 | ||
95da310e | 659 | static int oti6858_tiocmset(struct tty_struct *tty, struct file *file, |
49cdee0e KL |
660 | unsigned int set, unsigned int clear) |
661 | { | |
95da310e | 662 | struct usb_serial_port *port = tty->driver_data; |
49cdee0e KL |
663 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
664 | unsigned long flags; | |
665 | u8 control; | |
666 | ||
667 | dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)", | |
441b62c1 | 668 | __func__, port->number, set, clear); |
49cdee0e KL |
669 | |
670 | if (!usb_get_intfdata(port->serial->interface)) | |
671 | return -ENODEV; | |
672 | ||
673 | /* FIXME: check if this is correct (active high/low) */ | |
674 | spin_lock_irqsave(&priv->lock, flags); | |
675 | control = priv->pending_setup.control; | |
676 | if ((set & TIOCM_RTS) != 0) | |
677 | control |= CONTROL_RTS_HIGH; | |
678 | if ((set & TIOCM_DTR) != 0) | |
679 | control |= CONTROL_DTR_HIGH; | |
680 | if ((clear & TIOCM_RTS) != 0) | |
681 | control &= ~CONTROL_RTS_HIGH; | |
682 | if ((clear & TIOCM_DTR) != 0) | |
683 | control &= ~CONTROL_DTR_HIGH; | |
684 | ||
2a77c814 | 685 | if (control != priv->pending_setup.control) |
49cdee0e | 686 | priv->pending_setup.control = control; |
49cdee0e | 687 | |
2a77c814 | 688 | spin_unlock_irqrestore(&priv->lock, flags); |
49cdee0e KL |
689 | return 0; |
690 | } | |
691 | ||
95da310e | 692 | static int oti6858_tiocmget(struct tty_struct *tty, struct file *file) |
49cdee0e | 693 | { |
95da310e | 694 | struct usb_serial_port *port = tty->driver_data; |
49cdee0e KL |
695 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
696 | unsigned long flags; | |
697 | unsigned pin_state; | |
698 | unsigned result = 0; | |
699 | ||
441b62c1 | 700 | dbg("%s(port = %d)", __func__, port->number); |
49cdee0e KL |
701 | |
702 | if (!usb_get_intfdata(port->serial->interface)) | |
703 | return -ENODEV; | |
704 | ||
705 | spin_lock_irqsave(&priv->lock, flags); | |
706 | pin_state = priv->status.pin_state & PIN_MASK; | |
707 | spin_unlock_irqrestore(&priv->lock, flags); | |
708 | ||
709 | /* FIXME: check if this is correct (active high/low) */ | |
710 | if ((pin_state & PIN_RTS) != 0) | |
711 | result |= TIOCM_RTS; | |
712 | if ((pin_state & PIN_CTS) != 0) | |
713 | result |= TIOCM_CTS; | |
714 | if ((pin_state & PIN_DSR) != 0) | |
715 | result |= TIOCM_DSR; | |
716 | if ((pin_state & PIN_DTR) != 0) | |
717 | result |= TIOCM_DTR; | |
718 | if ((pin_state & PIN_RI) != 0) | |
719 | result |= TIOCM_RI; | |
720 | if ((pin_state & PIN_DCD) != 0) | |
721 | result |= TIOCM_CD; | |
722 | ||
441b62c1 | 723 | dbg("%s() = 0x%08x", __func__, result); |
49cdee0e KL |
724 | |
725 | return result; | |
726 | } | |
727 | ||
728 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) | |
729 | { | |
730 | struct oti6858_private *priv = usb_get_serial_port_data(port); | |
731 | unsigned long flags; | |
732 | unsigned int prev, status; | |
733 | unsigned int changed; | |
734 | ||
735 | spin_lock_irqsave(&priv->lock, flags); | |
736 | prev = priv->status.pin_state; | |
737 | spin_unlock_irqrestore(&priv->lock, flags); | |
738 | ||
739 | while (1) { | |
2a77c814 AC |
740 | wait_event_interruptible(priv->intr_wait, |
741 | priv->status.pin_state != prev); | |
49cdee0e KL |
742 | if (signal_pending(current)) |
743 | return -ERESTARTSYS; | |
744 | ||
745 | spin_lock_irqsave(&priv->lock, flags); | |
746 | status = priv->status.pin_state & PIN_MASK; | |
747 | spin_unlock_irqrestore(&priv->lock, flags); | |
748 | ||
749 | changed = prev ^ status; | |
750 | /* FIXME: check if this is correct (active high/low) */ | |
2a77c814 AC |
751 | if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || |
752 | ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || | |
753 | ((arg & TIOCM_CD) && (changed & PIN_DCD)) || | |
754 | ((arg & TIOCM_CTS) && (changed & PIN_CTS))) | |
755 | return 0; | |
49cdee0e KL |
756 | prev = status; |
757 | } | |
758 | ||
759 | /* NOTREACHED */ | |
760 | return 0; | |
761 | } | |
762 | ||
95da310e | 763 | static int oti6858_ioctl(struct tty_struct *tty, struct file *file, |
49cdee0e KL |
764 | unsigned int cmd, unsigned long arg) |
765 | { | |
95da310e | 766 | struct usb_serial_port *port = tty->driver_data; |
49cdee0e KL |
767 | |
768 | dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)", | |
441b62c1 | 769 | __func__, port->number, cmd, arg); |
49cdee0e KL |
770 | |
771 | switch (cmd) { | |
2a77c814 AC |
772 | case TIOCMIWAIT: |
773 | dbg("%s(): TIOCMIWAIT", __func__); | |
774 | return wait_modem_info(port, arg); | |
775 | default: | |
776 | dbg("%s(): 0x%04x not supported", __func__, cmd); | |
777 | break; | |
49cdee0e | 778 | } |
49cdee0e KL |
779 | return -ENOIOCTLCMD; |
780 | } | |
781 | ||
49cdee0e | 782 | |
f9c99bb8 | 783 | static void oti6858_release(struct usb_serial *serial) |
49cdee0e KL |
784 | { |
785 | struct oti6858_private *priv; | |
786 | int i; | |
787 | ||
441b62c1 | 788 | dbg("%s()", __func__); |
49cdee0e KL |
789 | |
790 | for (i = 0; i < serial->num_ports; ++i) { | |
791 | priv = usb_get_serial_port_data(serial->port[i]); | |
792 | if (priv) { | |
b0a239da | 793 | oti6858_buf_free(priv->buf); |
49cdee0e | 794 | kfree(priv); |
49cdee0e KL |
795 | } |
796 | } | |
797 | } | |
798 | ||
799 | static void oti6858_read_int_callback(struct urb *urb) | |
800 | { | |
cdc97792 | 801 | struct usb_serial_port *port = urb->context; |
49cdee0e KL |
802 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
803 | int transient = 0, can_recv = 0, resubmit = 1; | |
78c26aeb | 804 | int status = urb->status; |
49cdee0e | 805 | |
78c26aeb | 806 | dbg("%s(port = %d, status = %d)", |
441b62c1 | 807 | __func__, port->number, status); |
49cdee0e | 808 | |
78c26aeb | 809 | switch (status) { |
49cdee0e KL |
810 | case 0: |
811 | /* success */ | |
812 | break; | |
813 | case -ECONNRESET: | |
814 | case -ENOENT: | |
815 | case -ESHUTDOWN: | |
816 | /* this urb is terminated, clean up */ | |
817 | dbg("%s(): urb shutting down with status: %d", | |
441b62c1 | 818 | __func__, status); |
49cdee0e KL |
819 | return; |
820 | default: | |
821 | dbg("%s(): nonzero urb status received: %d", | |
441b62c1 | 822 | __func__, status); |
49cdee0e KL |
823 | break; |
824 | } | |
825 | ||
78c26aeb | 826 | if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { |
49cdee0e KL |
827 | struct oti6858_control_pkt *xs = urb->transfer_buffer; |
828 | unsigned long flags; | |
829 | ||
830 | spin_lock_irqsave(&priv->lock, flags); | |
831 | ||
832 | if (!priv->transient) { | |
833 | if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { | |
834 | if (xs->rx_bytes_avail == 0) { | |
835 | priv->transient = 4; | |
836 | priv->setup_done = 0; | |
837 | resubmit = 0; | |
838 | dbg("%s(): scheduling setup_line()", | |
441b62c1 | 839 | __func__); |
49cdee0e KL |
840 | schedule_delayed_work(&priv->delayed_setup_work, 0); |
841 | } | |
842 | } | |
843 | } else { | |
844 | if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { | |
845 | priv->transient = 0; | |
846 | } else if (!priv->setup_done) { | |
847 | resubmit = 0; | |
848 | } else if (--priv->transient == 0) { | |
849 | if (xs->rx_bytes_avail == 0) { | |
850 | priv->transient = 4; | |
851 | priv->setup_done = 0; | |
852 | resubmit = 0; | |
853 | dbg("%s(): scheduling setup_line()", | |
441b62c1 | 854 | __func__); |
49cdee0e KL |
855 | schedule_delayed_work(&priv->delayed_setup_work, 0); |
856 | } | |
857 | } | |
858 | } | |
859 | ||
860 | if (!priv->transient) { | |
861 | if (xs->pin_state != priv->status.pin_state) | |
862 | wake_up_interruptible(&priv->intr_wait); | |
863 | memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); | |
864 | } | |
865 | ||
866 | if (!priv->transient && xs->rx_bytes_avail != 0) { | |
867 | can_recv = xs->rx_bytes_avail; | |
868 | priv->flags.read_urb_in_use = 1; | |
869 | } | |
870 | ||
871 | transient = priv->transient; | |
872 | spin_unlock_irqrestore(&priv->lock, flags); | |
873 | } | |
874 | ||
875 | if (can_recv) { | |
876 | int result; | |
877 | ||
878 | port->read_urb->dev = port->serial->dev; | |
879 | result = usb_submit_urb(port->read_urb, GFP_ATOMIC); | |
880 | if (result != 0) { | |
881 | priv->flags.read_urb_in_use = 0; | |
882 | dev_err(&port->dev, "%s(): usb_submit_urb() failed," | |
441b62c1 | 883 | " error %d\n", __func__, result); |
49cdee0e KL |
884 | } else { |
885 | resubmit = 0; | |
886 | } | |
887 | } else if (!transient) { | |
888 | unsigned long flags; | |
889 | ||
890 | spin_lock_irqsave(&priv->lock, flags); | |
891 | if (priv->flags.write_urb_in_use == 0 | |
b0a239da | 892 | && oti6858_buf_data_avail(priv->buf) != 0) { |
2a77c814 | 893 | schedule_delayed_work(&priv->delayed_write_work, 0); |
49cdee0e KL |
894 | resubmit = 0; |
895 | } | |
896 | spin_unlock_irqrestore(&priv->lock, flags); | |
897 | } | |
898 | ||
899 | if (resubmit) { | |
900 | int result; | |
901 | ||
2a77c814 | 902 | /* dbg("%s(): submitting interrupt urb", __func__); */ |
49cdee0e KL |
903 | urb->dev = port->serial->dev; |
904 | result = usb_submit_urb(urb, GFP_ATOMIC); | |
905 | if (result != 0) { | |
906 | dev_err(&urb->dev->dev, | |
907 | "%s(): usb_submit_urb() failed with" | |
441b62c1 | 908 | " error %d\n", __func__, result); |
49cdee0e KL |
909 | } |
910 | } | |
911 | } | |
912 | ||
913 | static void oti6858_read_bulk_callback(struct urb *urb) | |
914 | { | |
cdc97792 | 915 | struct usb_serial_port *port = urb->context; |
49cdee0e KL |
916 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
917 | struct tty_struct *tty; | |
918 | unsigned char *data = urb->transfer_buffer; | |
919 | unsigned long flags; | |
78c26aeb | 920 | int status = urb->status; |
b0a239da | 921 | int result; |
49cdee0e | 922 | |
78c26aeb | 923 | dbg("%s(port = %d, status = %d)", |
441b62c1 | 924 | __func__, port->number, status); |
49cdee0e KL |
925 | |
926 | spin_lock_irqsave(&priv->lock, flags); | |
927 | priv->flags.read_urb_in_use = 0; | |
928 | spin_unlock_irqrestore(&priv->lock, flags); | |
929 | ||
78c26aeb | 930 | if (status != 0) { |
95da310e | 931 | if (!port->port.count) { |
441b62c1 | 932 | dbg("%s(): port is closed, exiting", __func__); |
49cdee0e KL |
933 | return; |
934 | } | |
935 | /* | |
78c26aeb | 936 | if (status == -EPROTO) { |
2a77c814 AC |
937 | * PL2303 mysteriously fails with -EPROTO reschedule |
938 | the read * | |
939 | dbg("%s - caught -EPROTO, resubmitting the urb", | |
940 | __func__); | |
49cdee0e KL |
941 | result = usb_submit_urb(urb, GFP_ATOMIC); |
942 | if (result) | |
441b62c1 | 943 | dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result); |
49cdee0e KL |
944 | return; |
945 | } | |
946 | */ | |
441b62c1 | 947 | dbg("%s(): unable to handle the error, exiting", __func__); |
49cdee0e KL |
948 | return; |
949 | } | |
950 | ||
4a90f09b | 951 | tty = tty_port_tty_get(&port->port); |
49cdee0e | 952 | if (tty != NULL && urb->actual_length > 0) { |
b0a239da | 953 | tty_insert_flip_string(tty, data, urb->actual_length); |
49cdee0e KL |
954 | tty_flip_buffer_push(tty); |
955 | } | |
4a90f09b | 956 | tty_kref_put(tty); |
49cdee0e | 957 | |
2a77c814 | 958 | /* schedule the interrupt urb if we are still open */ |
95da310e | 959 | if (port->port.count != 0) { |
49cdee0e KL |
960 | port->interrupt_in_urb->dev = port->serial->dev; |
961 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
962 | if (result != 0) { | |
963 | dev_err(&port->dev, "%s(): usb_submit_urb() failed," | |
441b62c1 | 964 | " error %d\n", __func__, result); |
49cdee0e KL |
965 | } |
966 | } | |
967 | } | |
968 | ||
969 | static void oti6858_write_bulk_callback(struct urb *urb) | |
970 | { | |
cdc97792 | 971 | struct usb_serial_port *port = urb->context; |
49cdee0e | 972 | struct oti6858_private *priv = usb_get_serial_port_data(port); |
78c26aeb | 973 | int status = urb->status; |
49cdee0e KL |
974 | int result; |
975 | ||
78c26aeb | 976 | dbg("%s(port = %d, status = %d)", |
441b62c1 | 977 | __func__, port->number, status); |
49cdee0e | 978 | |
78c26aeb | 979 | switch (status) { |
49cdee0e KL |
980 | case 0: |
981 | /* success */ | |
982 | break; | |
983 | case -ECONNRESET: | |
984 | case -ENOENT: | |
985 | case -ESHUTDOWN: | |
986 | /* this urb is terminated, clean up */ | |
987 | dbg("%s(): urb shutting down with status: %d", | |
441b62c1 | 988 | __func__, status); |
49cdee0e KL |
989 | priv->flags.write_urb_in_use = 0; |
990 | return; | |
991 | default: | |
992 | /* error in the urb, so we have to resubmit it */ | |
993 | dbg("%s(): nonzero write bulk status received: %d", | |
441b62c1 HH |
994 | __func__, status); |
995 | dbg("%s(): overflow in write", __func__); | |
49cdee0e KL |
996 | |
997 | port->write_urb->transfer_buffer_length = 1; | |
998 | port->write_urb->dev = port->serial->dev; | |
999 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); | |
1000 | if (result) { | |
1001 | dev_err(&port->dev, "%s(): usb_submit_urb() failed," | |
441b62c1 | 1002 | " error %d\n", __func__, result); |
49cdee0e KL |
1003 | } else { |
1004 | return; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | priv->flags.write_urb_in_use = 0; | |
1009 | ||
2a77c814 | 1010 | /* schedule the interrupt urb if we are still open */ |
49cdee0e | 1011 | port->interrupt_in_urb->dev = port->serial->dev; |
441b62c1 | 1012 | dbg("%s(): submitting interrupt urb", __func__); |
49cdee0e KL |
1013 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
1014 | if (result != 0) { | |
1015 | dev_err(&port->dev, "%s(): failed submitting int urb," | |
441b62c1 | 1016 | " error %d\n", __func__, result); |
49cdee0e KL |
1017 | } |
1018 | } | |
1019 | ||
1020 | ||
1021 | /* | |
b0a239da | 1022 | * oti6858_buf_alloc |
49cdee0e KL |
1023 | * |
1024 | * Allocate a circular buffer and all associated memory. | |
1025 | */ | |
b0a239da | 1026 | static struct oti6858_buf *oti6858_buf_alloc(unsigned int size) |
49cdee0e | 1027 | { |
b0a239da | 1028 | struct oti6858_buf *pb; |
49cdee0e KL |
1029 | |
1030 | if (size == 0) | |
1031 | return NULL; | |
1032 | ||
b0a239da | 1033 | pb = kmalloc(sizeof(struct oti6858_buf), GFP_KERNEL); |
49cdee0e KL |
1034 | if (pb == NULL) |
1035 | return NULL; | |
1036 | ||
1037 | pb->buf_buf = kmalloc(size, GFP_KERNEL); | |
1038 | if (pb->buf_buf == NULL) { | |
1039 | kfree(pb); | |
1040 | return NULL; | |
1041 | } | |
1042 | ||
1043 | pb->buf_size = size; | |
1044 | pb->buf_get = pb->buf_put = pb->buf_buf; | |
1045 | ||
1046 | return pb; | |
1047 | } | |
1048 | ||
1049 | /* | |
b0a239da | 1050 | * oti6858_buf_free |
49cdee0e KL |
1051 | * |
1052 | * Free the buffer and all associated memory. | |
1053 | */ | |
b0a239da | 1054 | static void oti6858_buf_free(struct oti6858_buf *pb) |
49cdee0e KL |
1055 | { |
1056 | if (pb) { | |
1057 | kfree(pb->buf_buf); | |
1058 | kfree(pb); | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | /* | |
b0a239da | 1063 | * oti6858_buf_clear |
49cdee0e KL |
1064 | * |
1065 | * Clear out all data in the circular buffer. | |
1066 | */ | |
b0a239da | 1067 | static void oti6858_buf_clear(struct oti6858_buf *pb) |
49cdee0e KL |
1068 | { |
1069 | if (pb != NULL) { | |
1070 | /* equivalent to a get of all data available */ | |
1071 | pb->buf_get = pb->buf_put; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | /* | |
b0a239da | 1076 | * oti6858_buf_data_avail |
49cdee0e KL |
1077 | * |
1078 | * Return the number of bytes of data available in the circular | |
1079 | * buffer. | |
1080 | */ | |
b0a239da | 1081 | static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb) |
49cdee0e KL |
1082 | { |
1083 | if (pb == NULL) | |
1084 | return 0; | |
2a77c814 | 1085 | return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size; |
49cdee0e KL |
1086 | } |
1087 | ||
1088 | /* | |
b0a239da | 1089 | * oti6858_buf_space_avail |
49cdee0e KL |
1090 | * |
1091 | * Return the number of bytes of space available in the circular | |
1092 | * buffer. | |
1093 | */ | |
b0a239da | 1094 | static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb) |
49cdee0e KL |
1095 | { |
1096 | if (pb == NULL) | |
1097 | return 0; | |
2a77c814 | 1098 | return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size; |
49cdee0e KL |
1099 | } |
1100 | ||
1101 | /* | |
b0a239da | 1102 | * oti6858_buf_put |
49cdee0e KL |
1103 | * |
1104 | * Copy data data from a user buffer and put it into the circular buffer. | |
1105 | * Restrict to the amount of space available. | |
1106 | * | |
1107 | * Return the number of bytes copied. | |
1108 | */ | |
b0a239da | 1109 | static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf, |
49cdee0e KL |
1110 | unsigned int count) |
1111 | { | |
1112 | unsigned int len; | |
1113 | ||
1114 | if (pb == NULL) | |
1115 | return 0; | |
1116 | ||
b0a239da | 1117 | len = oti6858_buf_space_avail(pb); |
49cdee0e KL |
1118 | if (count > len) |
1119 | count = len; | |
1120 | ||
1121 | if (count == 0) | |
1122 | return 0; | |
1123 | ||
1124 | len = pb->buf_buf + pb->buf_size - pb->buf_put; | |
1125 | if (count > len) { | |
1126 | memcpy(pb->buf_put, buf, len); | |
1127 | memcpy(pb->buf_buf, buf+len, count - len); | |
1128 | pb->buf_put = pb->buf_buf + count - len; | |
1129 | } else { | |
1130 | memcpy(pb->buf_put, buf, count); | |
1131 | if (count < len) | |
1132 | pb->buf_put += count; | |
1133 | else /* count == len */ | |
1134 | pb->buf_put = pb->buf_buf; | |
1135 | } | |
1136 | ||
1137 | return count; | |
1138 | } | |
1139 | ||
1140 | /* | |
b0a239da | 1141 | * oti6858_buf_get |
49cdee0e KL |
1142 | * |
1143 | * Get data from the circular buffer and copy to the given buffer. | |
1144 | * Restrict to the amount of data available. | |
1145 | * | |
1146 | * Return the number of bytes copied. | |
1147 | */ | |
b0a239da | 1148 | static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf, |
49cdee0e KL |
1149 | unsigned int count) |
1150 | { | |
1151 | unsigned int len; | |
1152 | ||
1153 | if (pb == NULL) | |
1154 | return 0; | |
1155 | ||
b0a239da | 1156 | len = oti6858_buf_data_avail(pb); |
49cdee0e KL |
1157 | if (count > len) |
1158 | count = len; | |
1159 | ||
1160 | if (count == 0) | |
1161 | return 0; | |
1162 | ||
1163 | len = pb->buf_buf + pb->buf_size - pb->buf_get; | |
1164 | if (count > len) { | |
1165 | memcpy(buf, pb->buf_get, len); | |
1166 | memcpy(buf+len, pb->buf_buf, count - len); | |
1167 | pb->buf_get = pb->buf_buf + count - len; | |
1168 | } else { | |
1169 | memcpy(buf, pb->buf_get, count); | |
1170 | if (count < len) | |
1171 | pb->buf_get += count; | |
1172 | else /* count == len */ | |
1173 | pb->buf_get = pb->buf_buf; | |
1174 | } | |
1175 | ||
1176 | return count; | |
1177 | } | |
1178 | ||
1179 | /* module description and (de)initialization */ | |
1180 | ||
1181 | static int __init oti6858_init(void) | |
1182 | { | |
1183 | int retval; | |
1184 | ||
2a77c814 AC |
1185 | retval = usb_serial_register(&oti6858_device); |
1186 | if (retval == 0) { | |
1187 | retval = usb_register(&oti6858_driver); | |
1188 | if (retval) | |
49cdee0e | 1189 | usb_serial_deregister(&oti6858_device); |
49cdee0e | 1190 | } |
49cdee0e KL |
1191 | return retval; |
1192 | } | |
1193 | ||
1194 | static void __exit oti6858_exit(void) | |
1195 | { | |
1196 | usb_deregister(&oti6858_driver); | |
1197 | usb_serial_deregister(&oti6858_device); | |
1198 | } | |
1199 | ||
1200 | module_init(oti6858_init); | |
1201 | module_exit(oti6858_exit); | |
1202 | ||
1203 | MODULE_DESCRIPTION(OTI6858_DESCRIPTION); | |
1204 | MODULE_AUTHOR(OTI6858_AUTHOR); | |
1205 | MODULE_VERSION(OTI6858_VERSION); | |
1206 | MODULE_LICENSE("GPL"); | |
1207 | ||
1208 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
1209 | MODULE_PARM_DESC(debug, "enable debug output"); | |
1210 |