blob: afb089695da84222370f9c23c3a7fff841ef8132 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Berkshire USB-PC Watchdog Card Driver
3 *
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +01004 * (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Based on source code of the following authors:
7 * Ken Hollis <kenji@bitgate.com>,
Alan Cox29fa0582008-10-27 15:17:56 +00008 * Alan Cox <alan@lxorguk.ukuu.org.uk>,
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
Wim Van Sebroeckd26d9092007-01-08 22:40:33 +010027#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 */
Wim Van Sebroeckd4b87592006-12-12 23:46:47 +010042#include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
Wim Van Sebroeck089ab072008-07-15 11:46:11 +000043#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
Wim Van Sebroeckd26d9092007-01-08 22:40:33 +010044
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
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 */
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +010058#define DRIVER_VERSION "1.02"
Wim Van Sebroeckbffda5c2007-01-27 20:54:24 +010059#define DRIVER_DATE "21 Jan 2007"
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#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
66MODULE_AUTHOR(DRIVER_AUTHOR);
67MODULE_DESCRIPTION(DRIVER_DESC);
68MODULE_LICENSE(DRIVER_LICENSE);
69MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
70MODULE_ALIAS_MISCDEV(TEMP_MINOR);
71
72/* Module Parameters */
73module_param(debug, int, 0);
74MODULE_PARM_DESC(debug, "Debug enabled or not");
75
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +010076#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077static int heartbeat = WATCHDOG_HEARTBEAT;
78module_param(heartbeat, int, 0);
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +010079MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Andrey Panin4bfdf372005-07-27 11:43:58 -070081static int nowayout = WATCHDOG_NOWAYOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082module_param(nowayout, int, 0);
Wim Van Sebroeckbffda5c2007-01-27 20:54:24 +010083MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
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 */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +000090static struct usb_device_id usb_pcwd_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
92 { } /* Terminating entry */
93};
94MODULE_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
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +0100111/* Watchdog's Dip Switch heartbeat values */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000112static const int heartbeat_tbl[] = {
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +0100113 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123/* We can only use 1 card due to the /dev/watchdog restriction */
124static int cards_found;
125
126/* some internal variables */
127static unsigned long is_active;
128static char expect_release;
129
130/* Structure to hold all of our device specific stuff */
131struct usb_pcwd_private {
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000132 struct usb_device *udev; /* save off the usb device pointer */
133 struct usb_interface *interface; /* the interface for this device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 unsigned int interface_number; /* the interface number used for cmd's */
136
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000137 unsigned char *intr_buffer; /* the buffer to intr data */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 dma_addr_t intr_dma; /* the dma address for the intr buffer */
139 size_t intr_size; /* the size of the intr buffer */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000140 struct urb *intr_urb; /* the urb used for the intr pipe */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
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 */
Matthias Kaehlcke9f7afa62007-05-03 20:15:14 -0700148 struct mutex mtx; /* locks this structure */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149};
150static struct usb_pcwd_private *usb_pcwd_device;
151
152/* prevent races between open() and disconnect() */
Ingo Molnar6f87f0d2006-03-23 03:00:27 -0800153static DEFINE_MUTEX(disconnect_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155/* local function prototypes */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000156static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id);
157static void usb_pcwd_disconnect(struct usb_interface *interface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159/* usb specific object needed to register this driver with the usb subsystem */
160static struct usb_driver usb_pcwd_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 .name = DRIVER_NAME,
162 .probe = usb_pcwd_probe,
163 .disconnect = usb_pcwd_disconnect,
164 .id_table = usb_pcwd_table,
165};
166
167
David Howells7d12e782006-10-05 14:55:46 +0100168static void usb_pcwd_intr_done(struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
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 */
Harvey Harrisonfa9363c2008-03-05 18:24:58 -0800181 dbg("%s - urb shutting down with status: %d", __func__, urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return;
183 /* -EPIPE: should clear the halt */
184 default: /* error */
Harvey Harrisonfa9363c2008-03-05 18:24:58 -0800185 dbg("%s - nonzero urb status received: %d", __func__, urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 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 */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000197 atomic_set(&usb_pcwd->cmd_received, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199resubmit:
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000200 retval = usb_submit_urb(urb, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (retval)
202 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
203 retval);
204}
205
206static 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
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000226 atomic_set(&usb_pcwd->cmd_received, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
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);
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000239 if (atomic_read(&usb_pcwd->cmd_received))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 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
252static 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
269static 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
286static 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
296static 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
311static 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
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +0200326static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339/*
340 * /dev/watchdog handling
341 */
342
343static 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;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000358 if (get_user(c, data + i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 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
Alan Coxc9488522008-07-03 23:51:32 -0700371static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
372 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
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) {
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000385 case WDIOC_GETSUPPORT:
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000386 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000388 case WDIOC_GETSTATUS:
389 case WDIOC_GETBOOTSTATUS:
390 return put_user(0, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000392 case WDIOC_GETTEMP:
393 {
394 int temperature;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000396 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
397 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000399 return put_user(temperature, p);
400 }
401
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000402 case WDIOC_SETOPTIONS:
403 {
404 int new_options, retval = -EINVAL;
405
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000406 if (get_user(new_options, p))
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000407 return -EFAULT;
408
409 if (new_options & WDIOS_DISABLECARD) {
410 usb_pcwd_stop(usb_pcwd_device);
411 retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 }
413
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000414 if (new_options & WDIOS_ENABLECARD) {
415 usb_pcwd_start(usb_pcwd_device);
416 retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000419 return retval;
420 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000422 case WDIOC_KEEPALIVE:
423 usb_pcwd_keepalive(usb_pcwd_device);
424 return 0;
425
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000426 case WDIOC_SETTIMEOUT:
427 {
428 int new_heartbeat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000430 if (get_user(new_heartbeat, p))
431 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000433 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
434 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000436 usb_pcwd_keepalive(usb_pcwd_device);
437 /* Fall */
438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000440 case WDIOC_GETTIMEOUT:
441 return put_user(heartbeat, p);
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +0200442
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000443 case WDIOC_GETTIMELEFT:
444 {
445 int time_left;
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +0200446
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000447 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
448 return -EFAULT;
Wim Van Sebroeck58b519f2006-05-21 12:48:44 +0200449
Wim Van Sebroeck5eb82492008-07-17 18:08:47 +0000450 return put_user(time_left, p);
451 }
452
453 default:
454 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 }
456}
457
458static int usb_pcwd_open(struct inode *inode, struct file *file)
459{
460 /* /dev/watchdog can only be opened once */
461 if (test_and_set_bit(0, &is_active))
462 return -EBUSY;
463
464 /* Activate */
465 usb_pcwd_start(usb_pcwd_device);
466 usb_pcwd_keepalive(usb_pcwd_device);
467 return nonseekable_open(inode, file);
468}
469
470static int usb_pcwd_release(struct inode *inode, struct file *file)
471{
472 /*
473 * Shut off the timer.
474 */
475 if (expect_release == 42) {
476 usb_pcwd_stop(usb_pcwd_device);
477 } else {
478 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
479 usb_pcwd_keepalive(usb_pcwd_device);
480 }
481 expect_release = 0;
482 clear_bit(0, &is_active);
483 return 0;
484}
485
486/*
487 * /dev/temperature handling
488 */
489
490static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
491 size_t len, loff_t *ppos)
492{
493 int temperature;
494
495 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
496 return -EFAULT;
497
498 if (copy_to_user(data, &temperature, 1))
499 return -EFAULT;
500
501 return 1;
502}
503
504static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
505{
506 return nonseekable_open(inode, file);
507}
508
509static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
510{
511 return 0;
512}
513
514/*
515 * Notify system
516 */
517
518static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
519{
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000520 if (code == SYS_DOWN || code == SYS_HALT)
521 usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 return NOTIFY_DONE;
524}
525
526/*
527 * Kernel Interfaces
528 */
529
Arjan van de Ven62322d22006-07-03 00:24:21 -0700530static const struct file_operations usb_pcwd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 .owner = THIS_MODULE,
532 .llseek = no_llseek,
533 .write = usb_pcwd_write,
Alan Coxc9488522008-07-03 23:51:32 -0700534 .unlocked_ioctl = usb_pcwd_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 .open = usb_pcwd_open,
536 .release = usb_pcwd_release,
537};
538
539static struct miscdevice usb_pcwd_miscdev = {
540 .minor = WATCHDOG_MINOR,
541 .name = "watchdog",
542 .fops = &usb_pcwd_fops,
543};
544
Arjan van de Ven62322d22006-07-03 00:24:21 -0700545static const struct file_operations usb_pcwd_temperature_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 .owner = THIS_MODULE,
547 .llseek = no_llseek,
548 .read = usb_pcwd_temperature_read,
549 .open = usb_pcwd_temperature_open,
550 .release = usb_pcwd_temperature_release,
551};
552
553static struct miscdevice usb_pcwd_temperature_miscdev = {
554 .minor = TEMP_MINOR,
555 .name = "temperature",
556 .fops = &usb_pcwd_temperature_fops,
557};
558
559static struct notifier_block usb_pcwd_notifier = {
560 .notifier_call = usb_pcwd_notify_sys,
561};
562
563/**
564 * usb_pcwd_delete
565 */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000566static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
Mariusz Kozlowski6265d622006-11-08 15:34:02 +0100568 usb_free_urb(usb_pcwd->intr_urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (usb_pcwd->intr_buffer != NULL)
570 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
571 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000572 kfree(usb_pcwd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
575/**
576 * usb_pcwd_probe
577 *
578 * Called by the usb core when a new device is connected that it thinks
579 * this driver might be interested in.
580 */
581static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
582{
583 struct usb_device *udev = interface_to_usbdev(interface);
584 struct usb_host_interface *iface_desc;
585 struct usb_endpoint_descriptor *endpoint;
586 struct usb_pcwd_private *usb_pcwd = NULL;
587 int pipe, maxp;
588 int retval = -ENOMEM;
589 int got_fw_rev;
590 unsigned char fw_rev_major, fw_rev_minor;
591 char fw_ver_str[20];
592 unsigned char option_switches, dummy;
593
594 cards_found++;
595 if (cards_found > 1) {
596 printk(KERN_ERR PFX "This driver only supports 1 device\n");
597 return -ENODEV;
598 }
599
600 /* get the active interface descriptor */
601 iface_desc = interface->cur_altsetting;
602
603 /* check out that we have a HID device */
604 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
605 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
606 return -ENODEV;
607 }
608
609 /* check out the endpoint: it has to be Interrupt & IN */
610 endpoint = &iface_desc->endpoint[0].desc;
611
612 if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
613 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
614 == USB_ENDPOINT_XFER_INT))) {
615 /* we didn't find a Interrupt endpoint with direction IN */
616 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
617 return -ENODEV;
618 }
619
620 /* get a handle to the interrupt data pipe */
621 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
622 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
623
624 /* allocate memory for our device and initialize it */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000625 usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 if (usb_pcwd == NULL) {
627 printk(KERN_ERR PFX "Out of memory\n");
628 goto error;
629 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631 usb_pcwd_device = usb_pcwd;
632
Matthias Kaehlcke9f7afa62007-05-03 20:15:14 -0700633 mutex_init(&usb_pcwd->mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 usb_pcwd->udev = udev;
635 usb_pcwd->interface = interface;
636 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
637 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
638
639 /* set up the memory buffer's */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000640 usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma);
641 if (!usb_pcwd->intr_buffer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 printk(KERN_ERR PFX "Out of memory\n");
643 goto error;
644 }
645
646 /* allocate the urb's */
647 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
648 if (!usb_pcwd->intr_urb) {
649 printk(KERN_ERR PFX "Out of memory\n");
650 goto error;
651 }
652
653 /* initialise the intr urb's */
654 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
655 usb_pcwd->intr_buffer, usb_pcwd->intr_size,
656 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
657 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
658 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
659
660 /* register our interrupt URB with the USB system */
661 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
662 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
663 retval = -EIO; /* failure */
664 goto error;
665 }
666
667 /* The device exists and can be communicated with */
668 usb_pcwd->exists = 1;
669
670 /* disable card */
671 usb_pcwd_stop(usb_pcwd);
672
673 /* Get the Firmware Version */
674 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000675 if (got_fw_rev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000677 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 sprintf(fw_ver_str, "<card no answer>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
681 fw_ver_str);
682
683 /* Get switch settings */
684 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
685
686 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
687 option_switches,
688 ((option_switches & 0x10) ? "ON" : "OFF"),
689 ((option_switches & 0x08) ? "ON" : "OFF"));
690
Wim Van Sebroeck2ef473d2007-01-08 22:45:30 +0100691 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
692 if (heartbeat == 0)
693 heartbeat = heartbeat_tbl[(option_switches & 0x07)];
694
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 /* Check that the heartbeat value is within it's range ; if not reset to the default */
696 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
697 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
698 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
699 WATCHDOG_HEARTBEAT);
700 }
701
702 retval = register_reboot_notifier(&usb_pcwd_notifier);
703 if (retval != 0) {
704 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
705 retval);
706 goto error;
707 }
708
709 retval = misc_register(&usb_pcwd_temperature_miscdev);
710 if (retval != 0) {
711 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
712 TEMP_MINOR, retval);
713 goto err_out_unregister_reboot;
714 }
715
716 retval = misc_register(&usb_pcwd_miscdev);
717 if (retval != 0) {
718 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
719 WATCHDOG_MINOR, retval);
720 goto err_out_misc_deregister;
721 }
722
723 /* we can register the device now, as it is ready */
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000724 usb_set_intfdata(interface, usb_pcwd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
727 heartbeat, nowayout);
728
729 return 0;
730
731err_out_misc_deregister:
732 misc_deregister(&usb_pcwd_temperature_miscdev);
733err_out_unregister_reboot:
734 unregister_reboot_notifier(&usb_pcwd_notifier);
735error:
Adrian Bunkc9d1a0b2006-03-10 19:04:38 +0100736 if (usb_pcwd)
737 usb_pcwd_delete(usb_pcwd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 usb_pcwd_device = NULL;
739 return retval;
740}
741
742
743/**
744 * usb_pcwd_disconnect
745 *
746 * Called by the usb core when the device is removed from the system.
747 *
748 * This routine guarantees that the driver will not submit any more urbs
749 * by clearing dev->udev.
750 */
751static void usb_pcwd_disconnect(struct usb_interface *interface)
752{
753 struct usb_pcwd_private *usb_pcwd;
754
755 /* prevent races with open() */
Ingo Molnar6f87f0d2006-03-23 03:00:27 -0800756 mutex_lock(&disconnect_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000758 usb_pcwd = usb_get_intfdata(interface);
759 usb_set_intfdata(interface, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Matthias Kaehlcke9f7afa62007-05-03 20:15:14 -0700761 mutex_lock(&usb_pcwd->mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
763 /* Stop the timer before we leave */
764 if (!nowayout)
765 usb_pcwd_stop(usb_pcwd);
766
767 /* We should now stop communicating with the USB PCWD device */
768 usb_pcwd->exists = 0;
769
770 /* Deregister */
771 misc_deregister(&usb_pcwd_miscdev);
772 misc_deregister(&usb_pcwd_temperature_miscdev);
773 unregister_reboot_notifier(&usb_pcwd_notifier);
774
Matthias Kaehlcke9f7afa62007-05-03 20:15:14 -0700775 mutex_unlock(&usb_pcwd->mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777 /* Delete the USB PCWD device */
778 usb_pcwd_delete(usb_pcwd);
779
780 cards_found--;
781
Ingo Molnar6f87f0d2006-03-23 03:00:27 -0800782 mutex_unlock(&disconnect_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
785}
786
787
788
789/**
790 * usb_pcwd_init
791 */
792static int __init usb_pcwd_init(void)
793{
794 int result;
795
796 /* register this driver with the USB subsystem */
797 result = usb_register(&usb_pcwd_driver);
798 if (result) {
799 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
800 result);
801 return result;
802 }
803
804 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
805 return 0;
806}
807
808
809/**
810 * usb_pcwd_exit
811 */
812static void __exit usb_pcwd_exit(void)
813{
814 /* deregister this driver with the USB subsystem */
815 usb_deregister(&usb_pcwd_driver);
816}
817
818
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000819module_init(usb_pcwd_init);
820module_exit(usb_pcwd_exit);