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1da177e4 LT |
1 | /* |
2 | * Berkshire USB-PC Watchdog Card Driver | |
3 | * | |
4 | * (c) Copyright 2004 Wim Van Sebroeck <wim@iguana.be>. | |
5 | * | |
6 | * Based on source code of the following authors: | |
7 | * Ken Hollis <kenji@bitgate.com>, | |
8 | * Alan Cox <alan@redhat.com>, | |
9 | * Matt Domsch <Matt_Domsch@dell.com>, | |
10 | * Rob Radez <rob@osinvestor.com>, | |
11 | * Greg Kroah-Hartman <greg@kroah.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License | |
15 | * as published by the Free Software Foundation; either version | |
16 | * 2 of the License, or (at your option) any later version. | |
17 | * | |
18 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor | |
19 | * provide warranty for any of this software. This material is | |
20 | * provided "AS-IS" and at no charge. | |
21 | * | |
22 | * Thanks also to Simon Machell at Berkshire Products Inc. for | |
23 | * providing the test hardware. More info is available at | |
24 | * http://www.berkprod.com/ or http://www.pcwatchdog.com/ | |
25 | */ | |
26 | ||
27 | #include <linux/config.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/moduleparam.h> | |
34 | #include <linux/types.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/miscdevice.h> | |
37 | #include <linux/watchdog.h> | |
38 | #include <linux/notifier.h> | |
39 | #include <linux/reboot.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/smp_lock.h> | |
42 | #include <linux/completion.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <linux/usb.h> | |
45 | ||
46 | ||
47 | #ifdef CONFIG_USB_DEBUG | |
48 | static int debug = 1; | |
49 | #else | |
50 | static int debug; | |
51 | #endif | |
52 | ||
53 | /* Use our own dbg macro */ | |
54 | #undef dbg | |
55 | #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) | |
56 | ||
57 | ||
58 | /* Module and Version Information */ | |
59 | #define DRIVER_VERSION "1.01" | |
60 | #define DRIVER_DATE "15 Mar 2005" | |
61 | #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" | |
62 | #define DRIVER_DESC "Berkshire USB-PC Watchdog driver" | |
63 | #define DRIVER_LICENSE "GPL" | |
64 | #define DRIVER_NAME "pcwd_usb" | |
65 | #define PFX DRIVER_NAME ": " | |
66 | ||
67 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
68 | MODULE_DESCRIPTION(DRIVER_DESC); | |
69 | MODULE_LICENSE(DRIVER_LICENSE); | |
70 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
71 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
72 | ||
73 | /* Module Parameters */ | |
74 | module_param(debug, int, 0); | |
75 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
76 | ||
77 | #define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */ | |
78 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
79 | module_param(heartbeat, int, 0); | |
80 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
81 | ||
82 | #ifdef CONFIG_WATCHDOG_NOWAYOUT | |
83 | static int nowayout = 1; | |
84 | #else | |
85 | static int nowayout = 0; | |
86 | #endif | |
87 | ||
88 | module_param(nowayout, int, 0); | |
89 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
90 | ||
91 | /* The vendor and product id's for the USB-PC Watchdog card */ | |
92 | #define USB_PCWD_VENDOR_ID 0x0c98 | |
93 | #define USB_PCWD_PRODUCT_ID 0x1140 | |
94 | ||
95 | /* table of devices that work with this driver */ | |
96 | static struct usb_device_id usb_pcwd_table [] = { | |
97 | { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, | |
98 | { } /* Terminating entry */ | |
99 | }; | |
100 | MODULE_DEVICE_TABLE (usb, usb_pcwd_table); | |
101 | ||
102 | /* according to documentation max. time to process a command for the USB | |
103 | * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ | |
104 | #define USB_COMMAND_TIMEOUT 250 | |
105 | ||
106 | /* Watchdog's internal commands */ | |
107 | #define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */ | |
108 | #define CMD_TRIGGER CMD_READ_TEMP | |
109 | #define CMD_GET_STATUS 0x04 /* Get Status Information */ | |
110 | #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ | |
111 | #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ | |
112 | #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ | |
113 | #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */ | |
114 | #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ | |
115 | #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG | |
116 | ||
117 | /* Some defines that I like to be somewhere else like include/linux/usb_hid.h */ | |
118 | #define HID_REQ_SET_REPORT 0x09 | |
119 | #define HID_DT_REPORT (USB_TYPE_CLASS | 0x02) | |
120 | ||
121 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
122 | static int cards_found; | |
123 | ||
124 | /* some internal variables */ | |
125 | static unsigned long is_active; | |
126 | static char expect_release; | |
127 | ||
128 | /* Structure to hold all of our device specific stuff */ | |
129 | struct usb_pcwd_private { | |
130 | struct usb_device * udev; /* save off the usb device pointer */ | |
131 | struct usb_interface * interface; /* the interface for this device */ | |
132 | ||
133 | unsigned int interface_number; /* the interface number used for cmd's */ | |
134 | ||
135 | unsigned char * intr_buffer; /* the buffer to intr data */ | |
136 | dma_addr_t intr_dma; /* the dma address for the intr buffer */ | |
137 | size_t intr_size; /* the size of the intr buffer */ | |
138 | struct urb * intr_urb; /* the urb used for the intr pipe */ | |
139 | ||
140 | unsigned char cmd_command; /* The command that is reported back */ | |
141 | unsigned char cmd_data_msb; /* The data MSB that is reported back */ | |
142 | unsigned char cmd_data_lsb; /* The data LSB that is reported back */ | |
143 | atomic_t cmd_received; /* true if we received a report after a command */ | |
144 | ||
145 | int exists; /* Wether or not the device exists */ | |
146 | struct semaphore sem; /* locks this structure */ | |
147 | }; | |
148 | static struct usb_pcwd_private *usb_pcwd_device; | |
149 | ||
150 | /* prevent races between open() and disconnect() */ | |
151 | static DECLARE_MUTEX (disconnect_sem); | |
152 | ||
153 | /* local function prototypes */ | |
154 | static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id); | |
155 | static void usb_pcwd_disconnect (struct usb_interface *interface); | |
156 | ||
157 | /* usb specific object needed to register this driver with the usb subsystem */ | |
158 | static struct usb_driver usb_pcwd_driver = { | |
159 | .owner = THIS_MODULE, | |
160 | .name = DRIVER_NAME, | |
161 | .probe = usb_pcwd_probe, | |
162 | .disconnect = usb_pcwd_disconnect, | |
163 | .id_table = usb_pcwd_table, | |
164 | }; | |
165 | ||
166 | ||
167 | static void usb_pcwd_intr_done(struct urb *urb, struct pt_regs *regs) | |
168 | { | |
169 | struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context; | |
170 | unsigned char *data = usb_pcwd->intr_buffer; | |
171 | int retval; | |
172 | ||
173 | switch (urb->status) { | |
174 | case 0: /* success */ | |
175 | break; | |
176 | case -ECONNRESET: /* unlink */ | |
177 | case -ENOENT: | |
178 | case -ESHUTDOWN: | |
179 | /* this urb is terminated, clean up */ | |
180 | dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); | |
181 | return; | |
182 | /* -EPIPE: should clear the halt */ | |
183 | default: /* error */ | |
184 | dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); | |
185 | goto resubmit; | |
186 | } | |
187 | ||
188 | dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", | |
189 | data[0], data[1], data[2]); | |
190 | ||
191 | usb_pcwd->cmd_command = data[0]; | |
192 | usb_pcwd->cmd_data_msb = data[1]; | |
193 | usb_pcwd->cmd_data_lsb = data[2]; | |
194 | ||
195 | /* notify anyone waiting that the cmd has finished */ | |
196 | atomic_set (&usb_pcwd->cmd_received, 1); | |
197 | ||
198 | resubmit: | |
199 | retval = usb_submit_urb (urb, GFP_ATOMIC); | |
200 | if (retval) | |
201 | printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n", | |
202 | retval); | |
203 | } | |
204 | ||
205 | static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd, | |
206 | unsigned char *msb, unsigned char *lsb) | |
207 | { | |
208 | int got_response, count; | |
209 | unsigned char buf[6]; | |
210 | ||
211 | /* We will not send any commands if the USB PCWD device does not exist */ | |
212 | if ((!usb_pcwd) || (!usb_pcwd->exists)) | |
213 | return -1; | |
214 | ||
215 | /* The USB PC Watchdog uses a 6 byte report format. The board currently uses | |
216 | * only 3 of the six bytes of the report. */ | |
217 | buf[0] = cmd; /* Byte 0 = CMD */ | |
218 | buf[1] = *msb; /* Byte 1 = Data MSB */ | |
219 | buf[2] = *lsb; /* Byte 2 = Data LSB */ | |
220 | buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ | |
221 | ||
222 | dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", | |
223 | buf[0], buf[1], buf[2]); | |
224 | ||
225 | atomic_set (&usb_pcwd->cmd_received, 0); | |
226 | ||
227 | if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), | |
228 | HID_REQ_SET_REPORT, HID_DT_REPORT, | |
229 | 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), | |
230 | USB_COMMAND_TIMEOUT) != sizeof(buf)) { | |
231 | dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); | |
232 | } | |
233 | /* wait till the usb card processed the command, | |
234 | * with a max. timeout of USB_COMMAND_TIMEOUT */ | |
235 | got_response = 0; | |
236 | for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) { | |
237 | mdelay(1); | |
238 | if (atomic_read (&usb_pcwd->cmd_received)) | |
239 | got_response = 1; | |
240 | } | |
241 | ||
242 | if ((got_response) && (cmd == usb_pcwd->cmd_command)) { | |
243 | /* read back response */ | |
244 | *msb = usb_pcwd->cmd_data_msb; | |
245 | *lsb = usb_pcwd->cmd_data_lsb; | |
246 | } | |
247 | ||
248 | return got_response; | |
249 | } | |
250 | ||
251 | static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) | |
252 | { | |
253 | unsigned char msb = 0x00; | |
254 | unsigned char lsb = 0x00; | |
255 | int retval; | |
256 | ||
257 | /* Enable Watchdog */ | |
258 | retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb); | |
259 | ||
260 | if ((retval == 0) || (lsb == 0)) { | |
261 | printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n"); | |
262 | return -1; | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) | |
269 | { | |
270 | unsigned char msb = 0xA5; | |
271 | unsigned char lsb = 0xC3; | |
272 | int retval; | |
273 | ||
274 | /* Disable Watchdog */ | |
275 | retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb); | |
276 | ||
277 | if ((retval == 0) || (lsb != 0)) { | |
278 | printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); | |
279 | return -1; | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) | |
286 | { | |
287 | unsigned char dummy; | |
288 | ||
289 | /* Re-trigger Watchdog */ | |
290 | usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) | |
296 | { | |
297 | unsigned char msb = t / 256; | |
298 | unsigned char lsb = t % 256; | |
299 | ||
300 | if ((t < 0x0001) || (t > 0xFFFF)) | |
301 | return -EINVAL; | |
302 | ||
303 | /* Write new heartbeat to watchdog */ | |
304 | usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); | |
305 | ||
306 | heartbeat = t; | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature) | |
311 | { | |
312 | unsigned char msb, lsb; | |
313 | ||
314 | usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); | |
315 | ||
316 | /* | |
317 | * Convert celsius to fahrenheit, since this was | |
318 | * the decided 'standard' for this return value. | |
319 | */ | |
320 | *temperature = (lsb * 9 / 5) + 32; | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | /* | |
326 | * /dev/watchdog handling | |
327 | */ | |
328 | ||
329 | static ssize_t usb_pcwd_write(struct file *file, const char __user *data, | |
330 | size_t len, loff_t *ppos) | |
331 | { | |
332 | /* See if we got the magic character 'V' and reload the timer */ | |
333 | if (len) { | |
334 | if (!nowayout) { | |
335 | size_t i; | |
336 | ||
337 | /* note: just in case someone wrote the magic character | |
338 | * five months ago... */ | |
339 | expect_release = 0; | |
340 | ||
341 | /* scan to see whether or not we got the magic character */ | |
342 | for (i = 0; i != len; i++) { | |
343 | char c; | |
344 | if(get_user(c, data+i)) | |
345 | return -EFAULT; | |
346 | if (c == 'V') | |
347 | expect_release = 42; | |
348 | } | |
349 | } | |
350 | ||
351 | /* someone wrote to us, we should reload the timer */ | |
352 | usb_pcwd_keepalive(usb_pcwd_device); | |
353 | } | |
354 | return len; | |
355 | } | |
356 | ||
357 | static int usb_pcwd_ioctl(struct inode *inode, struct file *file, | |
358 | unsigned int cmd, unsigned long arg) | |
359 | { | |
360 | void __user *argp = (void __user *)arg; | |
361 | int __user *p = argp; | |
362 | static struct watchdog_info ident = { | |
363 | .options = WDIOF_KEEPALIVEPING | | |
364 | WDIOF_SETTIMEOUT | | |
365 | WDIOF_MAGICCLOSE, | |
366 | .firmware_version = 1, | |
367 | .identity = DRIVER_NAME, | |
368 | }; | |
369 | ||
370 | switch (cmd) { | |
371 | case WDIOC_GETSUPPORT: | |
372 | return copy_to_user(argp, &ident, | |
373 | sizeof (ident)) ? -EFAULT : 0; | |
374 | ||
375 | case WDIOC_GETSTATUS: | |
376 | case WDIOC_GETBOOTSTATUS: | |
377 | return put_user(0, p); | |
378 | ||
379 | case WDIOC_GETTEMP: | |
380 | { | |
381 | int temperature; | |
382 | ||
383 | if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) | |
384 | return -EFAULT; | |
385 | ||
386 | return put_user(temperature, p); | |
387 | } | |
388 | ||
389 | case WDIOC_KEEPALIVE: | |
390 | usb_pcwd_keepalive(usb_pcwd_device); | |
391 | return 0; | |
392 | ||
393 | case WDIOC_SETOPTIONS: | |
394 | { | |
395 | int new_options, retval = -EINVAL; | |
396 | ||
397 | if (get_user (new_options, p)) | |
398 | return -EFAULT; | |
399 | ||
400 | if (new_options & WDIOS_DISABLECARD) { | |
401 | usb_pcwd_stop(usb_pcwd_device); | |
402 | retval = 0; | |
403 | } | |
404 | ||
405 | if (new_options & WDIOS_ENABLECARD) { | |
406 | usb_pcwd_start(usb_pcwd_device); | |
407 | retval = 0; | |
408 | } | |
409 | ||
410 | return retval; | |
411 | } | |
412 | ||
413 | case WDIOC_SETTIMEOUT: | |
414 | { | |
415 | int new_heartbeat; | |
416 | ||
417 | if (get_user(new_heartbeat, p)) | |
418 | return -EFAULT; | |
419 | ||
420 | if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) | |
421 | return -EINVAL; | |
422 | ||
423 | usb_pcwd_keepalive(usb_pcwd_device); | |
424 | /* Fall */ | |
425 | } | |
426 | ||
427 | case WDIOC_GETTIMEOUT: | |
428 | return put_user(heartbeat, p); | |
429 | ||
430 | default: | |
431 | return -ENOIOCTLCMD; | |
432 | } | |
433 | } | |
434 | ||
435 | static int usb_pcwd_open(struct inode *inode, struct file *file) | |
436 | { | |
437 | /* /dev/watchdog can only be opened once */ | |
438 | if (test_and_set_bit(0, &is_active)) | |
439 | return -EBUSY; | |
440 | ||
441 | /* Activate */ | |
442 | usb_pcwd_start(usb_pcwd_device); | |
443 | usb_pcwd_keepalive(usb_pcwd_device); | |
444 | return nonseekable_open(inode, file); | |
445 | } | |
446 | ||
447 | static int usb_pcwd_release(struct inode *inode, struct file *file) | |
448 | { | |
449 | /* | |
450 | * Shut off the timer. | |
451 | */ | |
452 | if (expect_release == 42) { | |
453 | usb_pcwd_stop(usb_pcwd_device); | |
454 | } else { | |
455 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
456 | usb_pcwd_keepalive(usb_pcwd_device); | |
457 | } | |
458 | expect_release = 0; | |
459 | clear_bit(0, &is_active); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | /* | |
464 | * /dev/temperature handling | |
465 | */ | |
466 | ||
467 | static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, | |
468 | size_t len, loff_t *ppos) | |
469 | { | |
470 | int temperature; | |
471 | ||
472 | if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) | |
473 | return -EFAULT; | |
474 | ||
475 | if (copy_to_user(data, &temperature, 1)) | |
476 | return -EFAULT; | |
477 | ||
478 | return 1; | |
479 | } | |
480 | ||
481 | static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) | |
482 | { | |
483 | return nonseekable_open(inode, file); | |
484 | } | |
485 | ||
486 | static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) | |
487 | { | |
488 | return 0; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Notify system | |
493 | */ | |
494 | ||
495 | static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
496 | { | |
497 | if (code==SYS_DOWN || code==SYS_HALT) { | |
498 | /* Turn the WDT off */ | |
499 | usb_pcwd_stop(usb_pcwd_device); | |
500 | } | |
501 | ||
502 | return NOTIFY_DONE; | |
503 | } | |
504 | ||
505 | /* | |
506 | * Kernel Interfaces | |
507 | */ | |
508 | ||
509 | static struct file_operations usb_pcwd_fops = { | |
510 | .owner = THIS_MODULE, | |
511 | .llseek = no_llseek, | |
512 | .write = usb_pcwd_write, | |
513 | .ioctl = usb_pcwd_ioctl, | |
514 | .open = usb_pcwd_open, | |
515 | .release = usb_pcwd_release, | |
516 | }; | |
517 | ||
518 | static struct miscdevice usb_pcwd_miscdev = { | |
519 | .minor = WATCHDOG_MINOR, | |
520 | .name = "watchdog", | |
521 | .fops = &usb_pcwd_fops, | |
522 | }; | |
523 | ||
524 | static struct file_operations usb_pcwd_temperature_fops = { | |
525 | .owner = THIS_MODULE, | |
526 | .llseek = no_llseek, | |
527 | .read = usb_pcwd_temperature_read, | |
528 | .open = usb_pcwd_temperature_open, | |
529 | .release = usb_pcwd_temperature_release, | |
530 | }; | |
531 | ||
532 | static struct miscdevice usb_pcwd_temperature_miscdev = { | |
533 | .minor = TEMP_MINOR, | |
534 | .name = "temperature", | |
535 | .fops = &usb_pcwd_temperature_fops, | |
536 | }; | |
537 | ||
538 | static struct notifier_block usb_pcwd_notifier = { | |
539 | .notifier_call = usb_pcwd_notify_sys, | |
540 | }; | |
541 | ||
542 | /** | |
543 | * usb_pcwd_delete | |
544 | */ | |
545 | static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd) | |
546 | { | |
547 | if (usb_pcwd->intr_urb != NULL) | |
548 | usb_free_urb (usb_pcwd->intr_urb); | |
549 | if (usb_pcwd->intr_buffer != NULL) | |
550 | usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size, | |
551 | usb_pcwd->intr_buffer, usb_pcwd->intr_dma); | |
552 | kfree (usb_pcwd); | |
553 | } | |
554 | ||
555 | /** | |
556 | * usb_pcwd_probe | |
557 | * | |
558 | * Called by the usb core when a new device is connected that it thinks | |
559 | * this driver might be interested in. | |
560 | */ | |
561 | static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id) | |
562 | { | |
563 | struct usb_device *udev = interface_to_usbdev(interface); | |
564 | struct usb_host_interface *iface_desc; | |
565 | struct usb_endpoint_descriptor *endpoint; | |
566 | struct usb_pcwd_private *usb_pcwd = NULL; | |
567 | int pipe, maxp; | |
568 | int retval = -ENOMEM; | |
569 | int got_fw_rev; | |
570 | unsigned char fw_rev_major, fw_rev_minor; | |
571 | char fw_ver_str[20]; | |
572 | unsigned char option_switches, dummy; | |
573 | ||
574 | cards_found++; | |
575 | if (cards_found > 1) { | |
576 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
577 | return -ENODEV; | |
578 | } | |
579 | ||
580 | /* get the active interface descriptor */ | |
581 | iface_desc = interface->cur_altsetting; | |
582 | ||
583 | /* check out that we have a HID device */ | |
584 | if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { | |
585 | printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); | |
586 | return -ENODEV; | |
587 | } | |
588 | ||
589 | /* check out the endpoint: it has to be Interrupt & IN */ | |
590 | endpoint = &iface_desc->endpoint[0].desc; | |
591 | ||
592 | if (!((endpoint->bEndpointAddress & USB_DIR_IN) && | |
593 | ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
594 | == USB_ENDPOINT_XFER_INT))) { | |
595 | /* we didn't find a Interrupt endpoint with direction IN */ | |
596 | printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); | |
597 | return -ENODEV; | |
598 | } | |
599 | ||
600 | /* get a handle to the interrupt data pipe */ | |
601 | pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); | |
602 | maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); | |
603 | ||
604 | /* allocate memory for our device and initialize it */ | |
605 | usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL); | |
606 | if (usb_pcwd == NULL) { | |
607 | printk(KERN_ERR PFX "Out of memory\n"); | |
608 | goto error; | |
609 | } | |
610 | memset (usb_pcwd, 0x00, sizeof (*usb_pcwd)); | |
611 | ||
612 | usb_pcwd_device = usb_pcwd; | |
613 | ||
614 | init_MUTEX (&usb_pcwd->sem); | |
615 | usb_pcwd->udev = udev; | |
616 | usb_pcwd->interface = interface; | |
617 | usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; | |
618 | usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8); | |
619 | ||
620 | /* set up the memory buffer's */ | |
621 | if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, SLAB_ATOMIC, &usb_pcwd->intr_dma))) { | |
622 | printk(KERN_ERR PFX "Out of memory\n"); | |
623 | goto error; | |
624 | } | |
625 | ||
626 | /* allocate the urb's */ | |
627 | usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); | |
628 | if (!usb_pcwd->intr_urb) { | |
629 | printk(KERN_ERR PFX "Out of memory\n"); | |
630 | goto error; | |
631 | } | |
632 | ||
633 | /* initialise the intr urb's */ | |
634 | usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, | |
635 | usb_pcwd->intr_buffer, usb_pcwd->intr_size, | |
636 | usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); | |
637 | usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; | |
638 | usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
639 | ||
640 | /* register our interrupt URB with the USB system */ | |
641 | if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { | |
642 | printk(KERN_ERR PFX "Problem registering interrupt URB\n"); | |
643 | retval = -EIO; /* failure */ | |
644 | goto error; | |
645 | } | |
646 | ||
647 | /* The device exists and can be communicated with */ | |
648 | usb_pcwd->exists = 1; | |
649 | ||
650 | /* disable card */ | |
651 | usb_pcwd_stop(usb_pcwd); | |
652 | ||
653 | /* Get the Firmware Version */ | |
654 | got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); | |
655 | if (got_fw_rev) { | |
656 | sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); | |
657 | } else { | |
658 | sprintf(fw_ver_str, "<card no answer>"); | |
659 | } | |
660 | ||
661 | printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", | |
662 | fw_ver_str); | |
663 | ||
664 | /* Get switch settings */ | |
665 | usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches); | |
666 | ||
667 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
668 | option_switches, | |
669 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
670 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
671 | ||
672 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
673 | if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { | |
674 | usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); | |
675 | printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", | |
676 | WATCHDOG_HEARTBEAT); | |
677 | } | |
678 | ||
679 | retval = register_reboot_notifier(&usb_pcwd_notifier); | |
680 | if (retval != 0) { | |
681 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
682 | retval); | |
683 | goto error; | |
684 | } | |
685 | ||
686 | retval = misc_register(&usb_pcwd_temperature_miscdev); | |
687 | if (retval != 0) { | |
688 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
689 | TEMP_MINOR, retval); | |
690 | goto err_out_unregister_reboot; | |
691 | } | |
692 | ||
693 | retval = misc_register(&usb_pcwd_miscdev); | |
694 | if (retval != 0) { | |
695 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
696 | WATCHDOG_MINOR, retval); | |
697 | goto err_out_misc_deregister; | |
698 | } | |
699 | ||
700 | /* we can register the device now, as it is ready */ | |
701 | usb_set_intfdata (interface, usb_pcwd); | |
702 | ||
703 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
704 | heartbeat, nowayout); | |
705 | ||
706 | return 0; | |
707 | ||
708 | err_out_misc_deregister: | |
709 | misc_deregister(&usb_pcwd_temperature_miscdev); | |
710 | err_out_unregister_reboot: | |
711 | unregister_reboot_notifier(&usb_pcwd_notifier); | |
712 | error: | |
713 | usb_pcwd_delete (usb_pcwd); | |
714 | usb_pcwd_device = NULL; | |
715 | return retval; | |
716 | } | |
717 | ||
718 | ||
719 | /** | |
720 | * usb_pcwd_disconnect | |
721 | * | |
722 | * Called by the usb core when the device is removed from the system. | |
723 | * | |
724 | * This routine guarantees that the driver will not submit any more urbs | |
725 | * by clearing dev->udev. | |
726 | */ | |
727 | static void usb_pcwd_disconnect(struct usb_interface *interface) | |
728 | { | |
729 | struct usb_pcwd_private *usb_pcwd; | |
730 | ||
731 | /* prevent races with open() */ | |
732 | down (&disconnect_sem); | |
733 | ||
734 | usb_pcwd = usb_get_intfdata (interface); | |
735 | usb_set_intfdata (interface, NULL); | |
736 | ||
737 | down (&usb_pcwd->sem); | |
738 | ||
739 | /* Stop the timer before we leave */ | |
740 | if (!nowayout) | |
741 | usb_pcwd_stop(usb_pcwd); | |
742 | ||
743 | /* We should now stop communicating with the USB PCWD device */ | |
744 | usb_pcwd->exists = 0; | |
745 | ||
746 | /* Deregister */ | |
747 | misc_deregister(&usb_pcwd_miscdev); | |
748 | misc_deregister(&usb_pcwd_temperature_miscdev); | |
749 | unregister_reboot_notifier(&usb_pcwd_notifier); | |
750 | ||
751 | up (&usb_pcwd->sem); | |
752 | ||
753 | /* Delete the USB PCWD device */ | |
754 | usb_pcwd_delete(usb_pcwd); | |
755 | ||
756 | cards_found--; | |
757 | ||
758 | up (&disconnect_sem); | |
759 | ||
760 | printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); | |
761 | } | |
762 | ||
763 | ||
764 | ||
765 | /** | |
766 | * usb_pcwd_init | |
767 | */ | |
768 | static int __init usb_pcwd_init(void) | |
769 | { | |
770 | int result; | |
771 | ||
772 | /* register this driver with the USB subsystem */ | |
773 | result = usb_register(&usb_pcwd_driver); | |
774 | if (result) { | |
775 | printk(KERN_ERR PFX "usb_register failed. Error number %d\n", | |
776 | result); | |
777 | return result; | |
778 | } | |
779 | ||
780 | printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); | |
781 | return 0; | |
782 | } | |
783 | ||
784 | ||
785 | /** | |
786 | * usb_pcwd_exit | |
787 | */ | |
788 | static void __exit usb_pcwd_exit(void) | |
789 | { | |
790 | /* deregister this driver with the USB subsystem */ | |
791 | usb_deregister(&usb_pcwd_driver); | |
792 | } | |
793 | ||
794 | ||
795 | module_init (usb_pcwd_init); | |
796 | module_exit (usb_pcwd_exit); |