Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Berkshire USB-PC Watchdog Card Driver | |
3 | * | |
2ef473de | 4 | * (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>. |
1da177e4 LT |
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 | ||
d26d9096 WVS |
27 | #include <linux/module.h> /* For module specific items */ |
28 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
29 | #include <linux/types.h> /* For standard types (like size_t) */ | |
30 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
31 | #include <linux/kernel.h> /* For printk/panic/... */ | |
32 | #include <linux/delay.h> /* For mdelay function */ | |
33 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
34 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
35 | #include <linux/notifier.h> /* For notifier support */ | |
36 | #include <linux/reboot.h> /* For reboot_notifier stuff */ | |
37 | #include <linux/init.h> /* For __init/__exit/... */ | |
38 | #include <linux/fs.h> /* For file operations */ | |
39 | #include <linux/usb.h> /* For USB functions */ | |
40 | #include <linux/slab.h> /* For kmalloc, ... */ | |
41 | #include <linux/mutex.h> /* For mutex locking */ | |
d4b87598 | 42 | #include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */ |
089ab079 | 43 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
d26d9096 | 44 | |
1da177e4 LT |
45 | |
46 | #ifdef CONFIG_USB_DEBUG | |
47 | static int debug = 1; | |
48 | #else | |
49 | static int debug; | |
50 | #endif | |
51 | ||
52 | /* Use our own dbg macro */ | |
53 | #undef dbg | |
54 | #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) | |
55 | ||
56 | ||
57 | /* Module and Version Information */ | |
2ef473de | 58 | #define DRIVER_VERSION "1.02" |
bffda5c8 | 59 | #define DRIVER_DATE "21 Jan 2007" |
1da177e4 LT |
60 | #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" |
61 | #define DRIVER_DESC "Berkshire USB-PC Watchdog driver" | |
62 | #define DRIVER_LICENSE "GPL" | |
63 | #define DRIVER_NAME "pcwd_usb" | |
64 | #define PFX DRIVER_NAME ": " | |
65 | ||
66 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
67 | MODULE_DESCRIPTION(DRIVER_DESC); | |
68 | MODULE_LICENSE(DRIVER_LICENSE); | |
69 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
70 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); | |
71 | ||
72 | /* Module Parameters */ | |
73 | module_param(debug, int, 0); | |
74 | MODULE_PARM_DESC(debug, "Debug enabled or not"); | |
75 | ||
2ef473de | 76 | #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ |
1da177e4 LT |
77 | static int heartbeat = WATCHDOG_HEARTBEAT; |
78 | module_param(heartbeat, int, 0); | |
2ef473de | 79 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
1da177e4 | 80 | |
4bfdf378 | 81 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 82 | module_param(nowayout, int, 0); |
bffda5c8 | 83 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
1da177e4 LT |
84 | |
85 | /* The vendor and product id's for the USB-PC Watchdog card */ | |
86 | #define USB_PCWD_VENDOR_ID 0x0c98 | |
87 | #define USB_PCWD_PRODUCT_ID 0x1140 | |
88 | ||
89 | /* table of devices that work with this driver */ | |
90 | static struct usb_device_id usb_pcwd_table [] = { | |
91 | { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, | |
92 | { } /* Terminating entry */ | |
93 | }; | |
94 | MODULE_DEVICE_TABLE (usb, usb_pcwd_table); | |
95 | ||
96 | /* according to documentation max. time to process a command for the USB | |
97 | * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ | |
98 | #define USB_COMMAND_TIMEOUT 250 | |
99 | ||
100 | /* Watchdog's internal commands */ | |
101 | #define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */ | |
102 | #define CMD_TRIGGER CMD_READ_TEMP | |
103 | #define CMD_GET_STATUS 0x04 /* Get Status Information */ | |
104 | #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ | |
105 | #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ | |
106 | #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ | |
107 | #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */ | |
108 | #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ | |
109 | #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG | |
110 | ||
2ef473de WVS |
111 | /* Watchdog's Dip Switch heartbeat values */ |
112 | static const int heartbeat_tbl [] = { | |
113 | 5, /* OFF-OFF-OFF = 5 Sec */ | |
114 | 10, /* OFF-OFF-ON = 10 Sec */ | |
115 | 30, /* OFF-ON-OFF = 30 Sec */ | |
116 | 60, /* OFF-ON-ON = 1 Min */ | |
117 | 300, /* ON-OFF-OFF = 5 Min */ | |
118 | 600, /* ON-OFF-ON = 10 Min */ | |
119 | 1800, /* ON-ON-OFF = 30 Min */ | |
120 | 3600, /* ON-ON-ON = 1 hour */ | |
121 | }; | |
122 | ||
1da177e4 LT |
123 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
124 | static int cards_found; | |
125 | ||
126 | /* some internal variables */ | |
127 | static unsigned long is_active; | |
128 | static char expect_release; | |
129 | ||
130 | /* Structure to hold all of our device specific stuff */ | |
131 | struct usb_pcwd_private { | |
132 | struct usb_device * udev; /* save off the usb device pointer */ | |
133 | struct usb_interface * interface; /* the interface for this device */ | |
134 | ||
135 | unsigned int interface_number; /* the interface number used for cmd's */ | |
136 | ||
137 | unsigned char * intr_buffer; /* the buffer to intr data */ | |
138 | dma_addr_t intr_dma; /* the dma address for the intr buffer */ | |
139 | size_t intr_size; /* the size of the intr buffer */ | |
140 | struct urb * intr_urb; /* the urb used for the intr pipe */ | |
141 | ||
142 | unsigned char cmd_command; /* The command that is reported back */ | |
143 | unsigned char cmd_data_msb; /* The data MSB that is reported back */ | |
144 | unsigned char cmd_data_lsb; /* The data LSB that is reported back */ | |
145 | atomic_t cmd_received; /* true if we received a report after a command */ | |
146 | ||
147 | int exists; /* Wether or not the device exists */ | |
9f7afa6b | 148 | struct mutex mtx; /* locks this structure */ |
1da177e4 LT |
149 | }; |
150 | static struct usb_pcwd_private *usb_pcwd_device; | |
151 | ||
152 | /* prevent races between open() and disconnect() */ | |
6f87f0de | 153 | static DEFINE_MUTEX(disconnect_mutex); |
1da177e4 LT |
154 | |
155 | /* local function prototypes */ | |
156 | static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id); | |
157 | static void usb_pcwd_disconnect (struct usb_interface *interface); | |
158 | ||
159 | /* usb specific object needed to register this driver with the usb subsystem */ | |
160 | static struct usb_driver usb_pcwd_driver = { | |
1da177e4 LT |
161 | .name = DRIVER_NAME, |
162 | .probe = usb_pcwd_probe, | |
163 | .disconnect = usb_pcwd_disconnect, | |
164 | .id_table = usb_pcwd_table, | |
165 | }; | |
166 | ||
167 | ||
7d12e780 | 168 | static void usb_pcwd_intr_done(struct urb *urb) |
1da177e4 LT |
169 | { |
170 | struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context; | |
171 | unsigned char *data = usb_pcwd->intr_buffer; | |
172 | int retval; | |
173 | ||
174 | switch (urb->status) { | |
175 | case 0: /* success */ | |
176 | break; | |
177 | case -ECONNRESET: /* unlink */ | |
178 | case -ENOENT: | |
179 | case -ESHUTDOWN: | |
180 | /* this urb is terminated, clean up */ | |
fa9363c5 | 181 | dbg("%s - urb shutting down with status: %d", __func__, urb->status); |
1da177e4 LT |
182 | return; |
183 | /* -EPIPE: should clear the halt */ | |
184 | default: /* error */ | |
fa9363c5 | 185 | dbg("%s - nonzero urb status received: %d", __func__, urb->status); |
1da177e4 LT |
186 | goto resubmit; |
187 | } | |
188 | ||
189 | dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", | |
190 | data[0], data[1], data[2]); | |
191 | ||
192 | usb_pcwd->cmd_command = data[0]; | |
193 | usb_pcwd->cmd_data_msb = data[1]; | |
194 | usb_pcwd->cmd_data_lsb = data[2]; | |
195 | ||
196 | /* notify anyone waiting that the cmd has finished */ | |
197 | atomic_set (&usb_pcwd->cmd_received, 1); | |
198 | ||
199 | resubmit: | |
200 | retval = usb_submit_urb (urb, GFP_ATOMIC); | |
201 | if (retval) | |
202 | printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n", | |
203 | retval); | |
204 | } | |
205 | ||
206 | static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd, | |
207 | unsigned char *msb, unsigned char *lsb) | |
208 | { | |
209 | int got_response, count; | |
210 | unsigned char buf[6]; | |
211 | ||
212 | /* We will not send any commands if the USB PCWD device does not exist */ | |
213 | if ((!usb_pcwd) || (!usb_pcwd->exists)) | |
214 | return -1; | |
215 | ||
216 | /* The USB PC Watchdog uses a 6 byte report format. The board currently uses | |
217 | * only 3 of the six bytes of the report. */ | |
218 | buf[0] = cmd; /* Byte 0 = CMD */ | |
219 | buf[1] = *msb; /* Byte 1 = Data MSB */ | |
220 | buf[2] = *lsb; /* Byte 2 = Data LSB */ | |
221 | buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ | |
222 | ||
223 | dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", | |
224 | buf[0], buf[1], buf[2]); | |
225 | ||
226 | atomic_set (&usb_pcwd->cmd_received, 0); | |
227 | ||
228 | if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), | |
229 | HID_REQ_SET_REPORT, HID_DT_REPORT, | |
230 | 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), | |
231 | USB_COMMAND_TIMEOUT) != sizeof(buf)) { | |
232 | dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); | |
233 | } | |
234 | /* wait till the usb card processed the command, | |
235 | * with a max. timeout of USB_COMMAND_TIMEOUT */ | |
236 | got_response = 0; | |
237 | for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) { | |
238 | mdelay(1); | |
239 | if (atomic_read (&usb_pcwd->cmd_received)) | |
240 | got_response = 1; | |
241 | } | |
242 | ||
243 | if ((got_response) && (cmd == usb_pcwd->cmd_command)) { | |
244 | /* read back response */ | |
245 | *msb = usb_pcwd->cmd_data_msb; | |
246 | *lsb = usb_pcwd->cmd_data_lsb; | |
247 | } | |
248 | ||
249 | return got_response; | |
250 | } | |
251 | ||
252 | static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) | |
253 | { | |
254 | unsigned char msb = 0x00; | |
255 | unsigned char lsb = 0x00; | |
256 | int retval; | |
257 | ||
258 | /* Enable Watchdog */ | |
259 | retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb); | |
260 | ||
261 | if ((retval == 0) || (lsb == 0)) { | |
262 | printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n"); | |
263 | return -1; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) | |
270 | { | |
271 | unsigned char msb = 0xA5; | |
272 | unsigned char lsb = 0xC3; | |
273 | int retval; | |
274 | ||
275 | /* Disable Watchdog */ | |
276 | retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb); | |
277 | ||
278 | if ((retval == 0) || (lsb != 0)) { | |
279 | printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) | |
287 | { | |
288 | unsigned char dummy; | |
289 | ||
290 | /* Re-trigger Watchdog */ | |
291 | usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) | |
297 | { | |
298 | unsigned char msb = t / 256; | |
299 | unsigned char lsb = t % 256; | |
300 | ||
301 | if ((t < 0x0001) || (t > 0xFFFF)) | |
302 | return -EINVAL; | |
303 | ||
304 | /* Write new heartbeat to watchdog */ | |
305 | usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); | |
306 | ||
307 | heartbeat = t; | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature) | |
312 | { | |
313 | unsigned char msb, lsb; | |
314 | ||
315 | usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); | |
316 | ||
317 | /* | |
318 | * Convert celsius to fahrenheit, since this was | |
319 | * the decided 'standard' for this return value. | |
320 | */ | |
321 | *temperature = (lsb * 9 / 5) + 32; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
58b519f3 WVS |
326 | static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left) |
327 | { | |
328 | unsigned char msb, lsb; | |
329 | ||
330 | /* Read the time that's left before rebooting */ | |
331 | /* Note: if the board is not yet armed then we will read 0xFFFF */ | |
332 | usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); | |
333 | ||
334 | *time_left = (msb << 8) + lsb; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
1da177e4 LT |
339 | /* |
340 | * /dev/watchdog handling | |
341 | */ | |
342 | ||
343 | static ssize_t usb_pcwd_write(struct file *file, const char __user *data, | |
344 | size_t len, loff_t *ppos) | |
345 | { | |
346 | /* See if we got the magic character 'V' and reload the timer */ | |
347 | if (len) { | |
348 | if (!nowayout) { | |
349 | size_t i; | |
350 | ||
351 | /* note: just in case someone wrote the magic character | |
352 | * five months ago... */ | |
353 | expect_release = 0; | |
354 | ||
355 | /* scan to see whether or not we got the magic character */ | |
356 | for (i = 0; i != len; i++) { | |
357 | char c; | |
358 | if(get_user(c, data+i)) | |
359 | return -EFAULT; | |
360 | if (c == 'V') | |
361 | expect_release = 42; | |
362 | } | |
363 | } | |
364 | ||
365 | /* someone wrote to us, we should reload the timer */ | |
366 | usb_pcwd_keepalive(usb_pcwd_device); | |
367 | } | |
368 | return len; | |
369 | } | |
370 | ||
c9488520 AC |
371 | static long usb_pcwd_ioctl(struct file *file, unsigned int cmd, |
372 | unsigned long arg) | |
1da177e4 LT |
373 | { |
374 | void __user *argp = (void __user *)arg; | |
375 | int __user *p = argp; | |
376 | static struct watchdog_info ident = { | |
377 | .options = WDIOF_KEEPALIVEPING | | |
378 | WDIOF_SETTIMEOUT | | |
379 | WDIOF_MAGICCLOSE, | |
380 | .firmware_version = 1, | |
381 | .identity = DRIVER_NAME, | |
382 | }; | |
383 | ||
384 | switch (cmd) { | |
5eb82498 WVS |
385 | case WDIOC_GETSUPPORT: |
386 | return copy_to_user(argp, &ident, | |
387 | sizeof (ident)) ? -EFAULT : 0; | |
1da177e4 | 388 | |
5eb82498 WVS |
389 | case WDIOC_GETSTATUS: |
390 | case WDIOC_GETBOOTSTATUS: | |
391 | return put_user(0, p); | |
1da177e4 | 392 | |
5eb82498 WVS |
393 | case WDIOC_GETTEMP: |
394 | { | |
395 | int temperature; | |
1da177e4 | 396 | |
5eb82498 WVS |
397 | if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
398 | return -EFAULT; | |
1da177e4 | 399 | |
5eb82498 WVS |
400 | return put_user(temperature, p); |
401 | } | |
1da177e4 | 402 | |
5eb82498 WVS |
403 | case WDIOC_SETOPTIONS: |
404 | { | |
405 | int new_options, retval = -EINVAL; | |
1da177e4 | 406 | |
5eb82498 WVS |
407 | if (get_user (new_options, p)) |
408 | return -EFAULT; | |
1da177e4 | 409 | |
5eb82498 WVS |
410 | if (new_options & WDIOS_DISABLECARD) { |
411 | usb_pcwd_stop(usb_pcwd_device); | |
412 | retval = 0; | |
413 | } | |
1da177e4 | 414 | |
5eb82498 WVS |
415 | if (new_options & WDIOS_ENABLECARD) { |
416 | usb_pcwd_start(usb_pcwd_device); | |
417 | retval = 0; | |
1da177e4 LT |
418 | } |
419 | ||
5eb82498 WVS |
420 | return retval; |
421 | } | |
1da177e4 | 422 | |
0c06090c WVS |
423 | case WDIOC_KEEPALIVE: |
424 | usb_pcwd_keepalive(usb_pcwd_device); | |
425 | return 0; | |
426 | ||
5eb82498 WVS |
427 | case WDIOC_SETTIMEOUT: |
428 | { | |
429 | int new_heartbeat; | |
1da177e4 | 430 | |
5eb82498 WVS |
431 | if (get_user(new_heartbeat, p)) |
432 | return -EFAULT; | |
1da177e4 | 433 | |
5eb82498 WVS |
434 | if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) |
435 | return -EINVAL; | |
1da177e4 | 436 | |
5eb82498 WVS |
437 | usb_pcwd_keepalive(usb_pcwd_device); |
438 | /* Fall */ | |
439 | } | |
1da177e4 | 440 | |
5eb82498 WVS |
441 | case WDIOC_GETTIMEOUT: |
442 | return put_user(heartbeat, p); | |
58b519f3 | 443 | |
5eb82498 WVS |
444 | case WDIOC_GETTIMELEFT: |
445 | { | |
446 | int time_left; | |
58b519f3 | 447 | |
5eb82498 WVS |
448 | if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) |
449 | return -EFAULT; | |
450 | ||
451 | return put_user(time_left, p); | |
452 | } | |
58b519f3 | 453 | |
5eb82498 WVS |
454 | default: |
455 | return -ENOTTY; | |
1da177e4 LT |
456 | } |
457 | } | |
458 | ||
459 | static int usb_pcwd_open(struct inode *inode, struct file *file) | |
460 | { | |
461 | /* /dev/watchdog can only be opened once */ | |
462 | if (test_and_set_bit(0, &is_active)) | |
463 | return -EBUSY; | |
464 | ||
465 | /* Activate */ | |
466 | usb_pcwd_start(usb_pcwd_device); | |
467 | usb_pcwd_keepalive(usb_pcwd_device); | |
468 | return nonseekable_open(inode, file); | |
469 | } | |
470 | ||
471 | static int usb_pcwd_release(struct inode *inode, struct file *file) | |
472 | { | |
473 | /* | |
474 | * Shut off the timer. | |
475 | */ | |
476 | if (expect_release == 42) { | |
477 | usb_pcwd_stop(usb_pcwd_device); | |
478 | } else { | |
479 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
480 | usb_pcwd_keepalive(usb_pcwd_device); | |
481 | } | |
482 | expect_release = 0; | |
483 | clear_bit(0, &is_active); | |
484 | return 0; | |
485 | } | |
486 | ||
487 | /* | |
488 | * /dev/temperature handling | |
489 | */ | |
490 | ||
491 | static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, | |
492 | size_t len, loff_t *ppos) | |
493 | { | |
494 | int temperature; | |
495 | ||
496 | if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) | |
497 | return -EFAULT; | |
498 | ||
499 | if (copy_to_user(data, &temperature, 1)) | |
500 | return -EFAULT; | |
501 | ||
502 | return 1; | |
503 | } | |
504 | ||
505 | static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) | |
506 | { | |
507 | return nonseekable_open(inode, file); | |
508 | } | |
509 | ||
510 | static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) | |
511 | { | |
512 | return 0; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Notify system | |
517 | */ | |
518 | ||
519 | static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
520 | { | |
521 | if (code==SYS_DOWN || code==SYS_HALT) { | |
522 | /* Turn the WDT off */ | |
523 | usb_pcwd_stop(usb_pcwd_device); | |
524 | } | |
525 | ||
526 | return NOTIFY_DONE; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Kernel Interfaces | |
531 | */ | |
532 | ||
62322d25 | 533 | static const struct file_operations usb_pcwd_fops = { |
1da177e4 LT |
534 | .owner = THIS_MODULE, |
535 | .llseek = no_llseek, | |
536 | .write = usb_pcwd_write, | |
c9488520 | 537 | .unlocked_ioctl = usb_pcwd_ioctl, |
1da177e4 LT |
538 | .open = usb_pcwd_open, |
539 | .release = usb_pcwd_release, | |
540 | }; | |
541 | ||
542 | static struct miscdevice usb_pcwd_miscdev = { | |
543 | .minor = WATCHDOG_MINOR, | |
544 | .name = "watchdog", | |
545 | .fops = &usb_pcwd_fops, | |
546 | }; | |
547 | ||
62322d25 | 548 | static const struct file_operations usb_pcwd_temperature_fops = { |
1da177e4 LT |
549 | .owner = THIS_MODULE, |
550 | .llseek = no_llseek, | |
551 | .read = usb_pcwd_temperature_read, | |
552 | .open = usb_pcwd_temperature_open, | |
553 | .release = usb_pcwd_temperature_release, | |
554 | }; | |
555 | ||
556 | static struct miscdevice usb_pcwd_temperature_miscdev = { | |
557 | .minor = TEMP_MINOR, | |
558 | .name = "temperature", | |
559 | .fops = &usb_pcwd_temperature_fops, | |
560 | }; | |
561 | ||
562 | static struct notifier_block usb_pcwd_notifier = { | |
563 | .notifier_call = usb_pcwd_notify_sys, | |
564 | }; | |
565 | ||
566 | /** | |
567 | * usb_pcwd_delete | |
568 | */ | |
569 | static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd) | |
570 | { | |
6265d62f | 571 | usb_free_urb(usb_pcwd->intr_urb); |
1da177e4 LT |
572 | if (usb_pcwd->intr_buffer != NULL) |
573 | usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size, | |
574 | usb_pcwd->intr_buffer, usb_pcwd->intr_dma); | |
575 | kfree (usb_pcwd); | |
576 | } | |
577 | ||
578 | /** | |
579 | * usb_pcwd_probe | |
580 | * | |
581 | * Called by the usb core when a new device is connected that it thinks | |
582 | * this driver might be interested in. | |
583 | */ | |
584 | static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id) | |
585 | { | |
586 | struct usb_device *udev = interface_to_usbdev(interface); | |
587 | struct usb_host_interface *iface_desc; | |
588 | struct usb_endpoint_descriptor *endpoint; | |
589 | struct usb_pcwd_private *usb_pcwd = NULL; | |
590 | int pipe, maxp; | |
591 | int retval = -ENOMEM; | |
592 | int got_fw_rev; | |
593 | unsigned char fw_rev_major, fw_rev_minor; | |
594 | char fw_ver_str[20]; | |
595 | unsigned char option_switches, dummy; | |
596 | ||
597 | cards_found++; | |
598 | if (cards_found > 1) { | |
599 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
600 | return -ENODEV; | |
601 | } | |
602 | ||
603 | /* get the active interface descriptor */ | |
604 | iface_desc = interface->cur_altsetting; | |
605 | ||
606 | /* check out that we have a HID device */ | |
607 | if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { | |
608 | printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); | |
609 | return -ENODEV; | |
610 | } | |
611 | ||
612 | /* check out the endpoint: it has to be Interrupt & IN */ | |
613 | endpoint = &iface_desc->endpoint[0].desc; | |
614 | ||
615 | if (!((endpoint->bEndpointAddress & USB_DIR_IN) && | |
616 | ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
617 | == USB_ENDPOINT_XFER_INT))) { | |
618 | /* we didn't find a Interrupt endpoint with direction IN */ | |
619 | printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); | |
620 | return -ENODEV; | |
621 | } | |
622 | ||
623 | /* get a handle to the interrupt data pipe */ | |
624 | pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); | |
625 | maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); | |
626 | ||
627 | /* allocate memory for our device and initialize it */ | |
dd00cc48 | 628 | usb_pcwd = kzalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL); |
1da177e4 LT |
629 | if (usb_pcwd == NULL) { |
630 | printk(KERN_ERR PFX "Out of memory\n"); | |
631 | goto error; | |
632 | } | |
1da177e4 LT |
633 | |
634 | usb_pcwd_device = usb_pcwd; | |
635 | ||
9f7afa6b | 636 | mutex_init(&usb_pcwd->mtx); |
1da177e4 LT |
637 | usb_pcwd->udev = udev; |
638 | usb_pcwd->interface = interface; | |
639 | usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; | |
640 | usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8); | |
641 | ||
642 | /* set up the memory buffer's */ | |
54e6ecb2 | 643 | if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) { |
1da177e4 LT |
644 | printk(KERN_ERR PFX "Out of memory\n"); |
645 | goto error; | |
646 | } | |
647 | ||
648 | /* allocate the urb's */ | |
649 | usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); | |
650 | if (!usb_pcwd->intr_urb) { | |
651 | printk(KERN_ERR PFX "Out of memory\n"); | |
652 | goto error; | |
653 | } | |
654 | ||
655 | /* initialise the intr urb's */ | |
656 | usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, | |
657 | usb_pcwd->intr_buffer, usb_pcwd->intr_size, | |
658 | usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); | |
659 | usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; | |
660 | usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
661 | ||
662 | /* register our interrupt URB with the USB system */ | |
663 | if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { | |
664 | printk(KERN_ERR PFX "Problem registering interrupt URB\n"); | |
665 | retval = -EIO; /* failure */ | |
666 | goto error; | |
667 | } | |
668 | ||
669 | /* The device exists and can be communicated with */ | |
670 | usb_pcwd->exists = 1; | |
671 | ||
672 | /* disable card */ | |
673 | usb_pcwd_stop(usb_pcwd); | |
674 | ||
675 | /* Get the Firmware Version */ | |
676 | got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); | |
677 | if (got_fw_rev) { | |
678 | sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); | |
679 | } else { | |
680 | sprintf(fw_ver_str, "<card no answer>"); | |
681 | } | |
682 | ||
683 | printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n", | |
684 | fw_ver_str); | |
685 | ||
686 | /* Get switch settings */ | |
687 | usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches); | |
688 | ||
689 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
690 | option_switches, | |
691 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
692 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
693 | ||
2ef473de WVS |
694 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
695 | if (heartbeat == 0) | |
696 | heartbeat = heartbeat_tbl[(option_switches & 0x07)]; | |
697 | ||
1da177e4 LT |
698 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ |
699 | if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { | |
700 | usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); | |
701 | printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", | |
702 | WATCHDOG_HEARTBEAT); | |
703 | } | |
704 | ||
705 | retval = register_reboot_notifier(&usb_pcwd_notifier); | |
706 | if (retval != 0) { | |
707 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
708 | retval); | |
709 | goto error; | |
710 | } | |
711 | ||
712 | retval = misc_register(&usb_pcwd_temperature_miscdev); | |
713 | if (retval != 0) { | |
714 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
715 | TEMP_MINOR, retval); | |
716 | goto err_out_unregister_reboot; | |
717 | } | |
718 | ||
719 | retval = misc_register(&usb_pcwd_miscdev); | |
720 | if (retval != 0) { | |
721 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
722 | WATCHDOG_MINOR, retval); | |
723 | goto err_out_misc_deregister; | |
724 | } | |
725 | ||
726 | /* we can register the device now, as it is ready */ | |
727 | usb_set_intfdata (interface, usb_pcwd); | |
728 | ||
729 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
730 | heartbeat, nowayout); | |
731 | ||
732 | return 0; | |
733 | ||
734 | err_out_misc_deregister: | |
735 | misc_deregister(&usb_pcwd_temperature_miscdev); | |
736 | err_out_unregister_reboot: | |
737 | unregister_reboot_notifier(&usb_pcwd_notifier); | |
738 | error: | |
c9d1a0b8 AB |
739 | if (usb_pcwd) |
740 | usb_pcwd_delete(usb_pcwd); | |
1da177e4 LT |
741 | usb_pcwd_device = NULL; |
742 | return retval; | |
743 | } | |
744 | ||
745 | ||
746 | /** | |
747 | * usb_pcwd_disconnect | |
748 | * | |
749 | * Called by the usb core when the device is removed from the system. | |
750 | * | |
751 | * This routine guarantees that the driver will not submit any more urbs | |
752 | * by clearing dev->udev. | |
753 | */ | |
754 | static void usb_pcwd_disconnect(struct usb_interface *interface) | |
755 | { | |
756 | struct usb_pcwd_private *usb_pcwd; | |
757 | ||
758 | /* prevent races with open() */ | |
6f87f0de | 759 | mutex_lock(&disconnect_mutex); |
1da177e4 LT |
760 | |
761 | usb_pcwd = usb_get_intfdata (interface); | |
762 | usb_set_intfdata (interface, NULL); | |
763 | ||
9f7afa6b | 764 | mutex_lock(&usb_pcwd->mtx); |
1da177e4 LT |
765 | |
766 | /* Stop the timer before we leave */ | |
767 | if (!nowayout) | |
768 | usb_pcwd_stop(usb_pcwd); | |
769 | ||
770 | /* We should now stop communicating with the USB PCWD device */ | |
771 | usb_pcwd->exists = 0; | |
772 | ||
773 | /* Deregister */ | |
774 | misc_deregister(&usb_pcwd_miscdev); | |
775 | misc_deregister(&usb_pcwd_temperature_miscdev); | |
776 | unregister_reboot_notifier(&usb_pcwd_notifier); | |
777 | ||
9f7afa6b | 778 | mutex_unlock(&usb_pcwd->mtx); |
1da177e4 LT |
779 | |
780 | /* Delete the USB PCWD device */ | |
781 | usb_pcwd_delete(usb_pcwd); | |
782 | ||
783 | cards_found--; | |
784 | ||
6f87f0de | 785 | mutex_unlock(&disconnect_mutex); |
1da177e4 LT |
786 | |
787 | printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); | |
788 | } | |
789 | ||
790 | ||
791 | ||
792 | /** | |
793 | * usb_pcwd_init | |
794 | */ | |
795 | static int __init usb_pcwd_init(void) | |
796 | { | |
797 | int result; | |
798 | ||
799 | /* register this driver with the USB subsystem */ | |
800 | result = usb_register(&usb_pcwd_driver); | |
801 | if (result) { | |
802 | printk(KERN_ERR PFX "usb_register failed. Error number %d\n", | |
803 | result); | |
804 | return result; | |
805 | } | |
806 | ||
807 | printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); | |
808 | return 0; | |
809 | } | |
810 | ||
811 | ||
812 | /** | |
813 | * usb_pcwd_exit | |
814 | */ | |
815 | static void __exit usb_pcwd_exit(void) | |
816 | { | |
817 | /* deregister this driver with the USB subsystem */ | |
818 | usb_deregister(&usb_pcwd_driver); | |
819 | } | |
820 | ||
821 | ||
822 | module_init (usb_pcwd_init); | |
823 | module_exit (usb_pcwd_exit); |