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-rw-r--r--drivers/watchdog/pcwd_usb.c824
1 files changed, 824 insertions, 0 deletions
diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
new file mode 100644
index 000000000000..0f3fd6c9c354
--- /dev/null
+++ b/drivers/watchdog/pcwd_usb.c
@@ -0,0 +1,824 @@
1/*
2 * Berkshire USB-PC Watchdog Card Driver
3 *
4 * (c) Copyright 2004-2007 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/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 */
42#include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
43
44#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
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 "1.02"
60#define DRIVER_DATE "21 Jan 2007"
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
67MODULE_AUTHOR(DRIVER_AUTHOR);
68MODULE_DESCRIPTION(DRIVER_DESC);
69MODULE_LICENSE(DRIVER_LICENSE);
70MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
71MODULE_ALIAS_MISCDEV(TEMP_MINOR);
72
73/* Module Parameters */
74module_param(debug, int, 0);
75MODULE_PARM_DESC(debug, "Debug enabled or not");
76
77#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */
78static int heartbeat = WATCHDOG_HEARTBEAT;
79module_param(heartbeat, int, 0);
80MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
81
82static int nowayout = WATCHDOG_NOWAYOUT;
83module_param(nowayout, int, 0);
84MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
85
86/* The vendor and product id's for the USB-PC Watchdog card */
87#define USB_PCWD_VENDOR_ID 0x0c98
88#define USB_PCWD_PRODUCT_ID 0x1140
89
90/* table of devices that work with this driver */
91static struct usb_device_id usb_pcwd_table [] = {
92 { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
93 { } /* Terminating entry */
94};
95MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
96
97/* according to documentation max. time to process a command for the USB
98 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
99#define USB_COMMAND_TIMEOUT 250
100
101/* Watchdog's internal commands */
102#define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */
103#define CMD_TRIGGER CMD_READ_TEMP
104#define CMD_GET_STATUS 0x04 /* Get Status Information */
105#define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */
106#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */
107#define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */
108#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */
109#define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */
110#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
111
112/* Watchdog's Dip Switch heartbeat values */
113static const int heartbeat_tbl [] = {
114 5, /* OFF-OFF-OFF = 5 Sec */
115 10, /* OFF-OFF-ON = 10 Sec */
116 30, /* OFF-ON-OFF = 30 Sec */
117 60, /* OFF-ON-ON = 1 Min */
118 300, /* ON-OFF-OFF = 5 Min */
119 600, /* ON-OFF-ON = 10 Min */
120 1800, /* ON-ON-OFF = 30 Min */
121 3600, /* ON-ON-ON = 1 hour */
122};
123
124/* We can only use 1 card due to the /dev/watchdog restriction */
125static int cards_found;
126
127/* some internal variables */
128static unsigned long is_active;
129static char expect_release;
130
131/* Structure to hold all of our device specific stuff */
132struct usb_pcwd_private {
133 struct usb_device * udev; /* save off the usb device pointer */
134 struct usb_interface * interface; /* the interface for this device */
135
136 unsigned int interface_number; /* the interface number used for cmd's */
137
138 unsigned char * intr_buffer; /* the buffer to intr data */
139 dma_addr_t intr_dma; /* the dma address for the intr buffer */
140 size_t intr_size; /* the size of the intr buffer */
141 struct urb * intr_urb; /* the urb used for the intr pipe */
142
143 unsigned char cmd_command; /* The command that is reported back */
144 unsigned char cmd_data_msb; /* The data MSB that is reported back */
145 unsigned char cmd_data_lsb; /* The data LSB that is reported back */
146 atomic_t cmd_received; /* true if we received a report after a command */
147
148 int exists; /* Wether or not the device exists */
149 struct mutex mtx; /* locks this structure */
150};
151static struct usb_pcwd_private *usb_pcwd_device;
152
153/* prevent races between open() and disconnect() */
154static DEFINE_MUTEX(disconnect_mutex);
155
156/* local function prototypes */
157static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id);
158static void usb_pcwd_disconnect (struct usb_interface *interface);
159
160/* usb specific object needed to register this driver with the usb subsystem */
161static struct usb_driver usb_pcwd_driver = {
162 .name = DRIVER_NAME,
163 .probe = usb_pcwd_probe,
164 .disconnect = usb_pcwd_disconnect,
165 .id_table = usb_pcwd_table,
166};
167
168
169static void usb_pcwd_intr_done(struct urb *urb)
170{
171 struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
172 unsigned char *data = usb_pcwd->intr_buffer;
173 int retval;
174
175 switch (urb->status) {
176 case 0: /* success */
177 break;
178 case -ECONNRESET: /* unlink */
179 case -ENOENT:
180 case -ESHUTDOWN:
181 /* this urb is terminated, clean up */
182 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
183 return;
184 /* -EPIPE: should clear the halt */
185 default: /* error */
186 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
187 goto resubmit;
188 }
189
190 dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
191 data[0], data[1], data[2]);
192
193 usb_pcwd->cmd_command = data[0];
194 usb_pcwd->cmd_data_msb = data[1];
195 usb_pcwd->cmd_data_lsb = data[2];
196
197 /* notify anyone waiting that the cmd has finished */
198 atomic_set (&usb_pcwd->cmd_received, 1);
199
200resubmit:
201 retval = usb_submit_urb (urb, GFP_ATOMIC);
202 if (retval)
203 printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
204 retval);
205}
206
207static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
208 unsigned char *msb, unsigned char *lsb)
209{
210 int got_response, count;
211 unsigned char buf[6];
212
213 /* We will not send any commands if the USB PCWD device does not exist */
214 if ((!usb_pcwd) || (!usb_pcwd->exists))
215 return -1;
216
217 /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
218 * only 3 of the six bytes of the report. */
219 buf[0] = cmd; /* Byte 0 = CMD */
220 buf[1] = *msb; /* Byte 1 = Data MSB */
221 buf[2] = *lsb; /* Byte 2 = Data LSB */
222 buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */
223
224 dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
225 buf[0], buf[1], buf[2]);
226
227 atomic_set (&usb_pcwd->cmd_received, 0);
228
229 if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
230 HID_REQ_SET_REPORT, HID_DT_REPORT,
231 0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
232 USB_COMMAND_TIMEOUT) != sizeof(buf)) {
233 dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
234 }
235 /* wait till the usb card processed the command,
236 * with a max. timeout of USB_COMMAND_TIMEOUT */
237 got_response = 0;
238 for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
239 mdelay(1);
240 if (atomic_read (&usb_pcwd->cmd_received))
241 got_response = 1;
242 }
243
244 if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
245 /* read back response */
246 *msb = usb_pcwd->cmd_data_msb;
247 *lsb = usb_pcwd->cmd_data_lsb;
248 }
249
250 return got_response;
251}
252
253static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
254{
255 unsigned char msb = 0x00;
256 unsigned char lsb = 0x00;
257 int retval;
258
259 /* Enable Watchdog */
260 retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
261
262 if ((retval == 0) || (lsb == 0)) {
263 printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
264 return -1;
265 }
266
267 return 0;
268}
269
270static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
271{
272 unsigned char msb = 0xA5;
273 unsigned char lsb = 0xC3;
274 int retval;
275
276 /* Disable Watchdog */
277 retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
278
279 if ((retval == 0) || (lsb != 0)) {
280 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
281 return -1;
282 }
283
284 return 0;
285}
286
287static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
288{
289 unsigned char dummy;
290
291 /* Re-trigger Watchdog */
292 usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
293
294 return 0;
295}
296
297static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
298{
299 unsigned char msb = t / 256;
300 unsigned char lsb = t % 256;
301
302 if ((t < 0x0001) || (t > 0xFFFF))
303 return -EINVAL;
304
305 /* Write new heartbeat to watchdog */
306 usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
307
308 heartbeat = t;
309 return 0;
310}
311
312static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
313{
314 unsigned char msb, lsb;
315
316 usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
317
318 /*
319 * Convert celsius to fahrenheit, since this was
320 * the decided 'standard' for this return value.
321 */
322 *temperature = (lsb * 9 / 5) + 32;
323
324 return 0;
325}
326
327static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left)
328{
329 unsigned char msb, lsb;
330
331 /* Read the time that's left before rebooting */
332 /* Note: if the board is not yet armed then we will read 0xFFFF */
333 usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
334
335 *time_left = (msb << 8) + lsb;
336
337 return 0;
338}
339
340/*
341 * /dev/watchdog handling
342 */
343
344static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
345 size_t len, loff_t *ppos)
346{
347 /* See if we got the magic character 'V' and reload the timer */
348 if (len) {
349 if (!nowayout) {
350 size_t i;
351
352 /* note: just in case someone wrote the magic character
353 * five months ago... */
354 expect_release = 0;
355
356 /* scan to see whether or not we got the magic character */
357 for (i = 0; i != len; i++) {
358 char c;
359 if(get_user(c, data+i))
360 return -EFAULT;
361 if (c == 'V')
362 expect_release = 42;
363 }
364 }
365
366 /* someone wrote to us, we should reload the timer */
367 usb_pcwd_keepalive(usb_pcwd_device);
368 }
369 return len;
370}
371
372static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
373 unsigned int cmd, unsigned long arg)
374{
375 void __user *argp = (void __user *)arg;
376 int __user *p = argp;
377 static struct watchdog_info ident = {
378 .options = WDIOF_KEEPALIVEPING |
379 WDIOF_SETTIMEOUT |
380 WDIOF_MAGICCLOSE,
381 .firmware_version = 1,
382 .identity = DRIVER_NAME,
383 };
384
385 switch (cmd) {
386 case WDIOC_GETSUPPORT:
387 return copy_to_user(argp, &ident,
388 sizeof (ident)) ? -EFAULT : 0;
389
390 case WDIOC_GETSTATUS:
391 case WDIOC_GETBOOTSTATUS:
392 return put_user(0, p);
393
394 case WDIOC_GETTEMP:
395 {
396 int temperature;
397
398 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
399 return -EFAULT;
400
401 return put_user(temperature, p);
402 }
403
404 case WDIOC_KEEPALIVE:
405 usb_pcwd_keepalive(usb_pcwd_device);
406 return 0;
407
408 case WDIOC_SETOPTIONS:
409 {
410 int new_options, retval = -EINVAL;
411
412 if (get_user (new_options, p))
413 return -EFAULT;
414
415 if (new_options & WDIOS_DISABLECARD) {
416 usb_pcwd_stop(usb_pcwd_device);
417 retval = 0;
418 }
419
420 if (new_options & WDIOS_ENABLECARD) {
421 usb_pcwd_start(usb_pcwd_device);
422 retval = 0;
423 }
424
425 return retval;
426 }
427
428 case WDIOC_SETTIMEOUT:
429 {
430 int new_heartbeat;
431
432 if (get_user(new_heartbeat, p))
433 return -EFAULT;
434
435 if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
436 return -EINVAL;
437
438 usb_pcwd_keepalive(usb_pcwd_device);
439 /* Fall */
440 }
441
442 case WDIOC_GETTIMEOUT:
443 return put_user(heartbeat, p);
444
445 case WDIOC_GETTIMELEFT:
446 {
447 int time_left;
448
449 if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
450 return -EFAULT;
451
452 return put_user(time_left, p);
453 }
454
455 default:
456 return -ENOTTY;
457 }
458}
459
460static int usb_pcwd_open(struct inode *inode, struct file *file)
461{
462 /* /dev/watchdog can only be opened once */
463 if (test_and_set_bit(0, &is_active))
464 return -EBUSY;
465
466 /* Activate */
467 usb_pcwd_start(usb_pcwd_device);
468 usb_pcwd_keepalive(usb_pcwd_device);
469 return nonseekable_open(inode, file);
470}
471
472static int usb_pcwd_release(struct inode *inode, struct file *file)
473{
474 /*
475 * Shut off the timer.
476 */
477 if (expect_release == 42) {
478 usb_pcwd_stop(usb_pcwd_device);
479 } else {
480 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
481 usb_pcwd_keepalive(usb_pcwd_device);
482 }
483 expect_release = 0;
484 clear_bit(0, &is_active);
485 return 0;
486}
487
488/*
489 * /dev/temperature handling
490 */
491
492static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
493 size_t len, loff_t *ppos)
494{
495 int temperature;
496
497 if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
498 return -EFAULT;
499
500 if (copy_to_user(data, &temperature, 1))
501 return -EFAULT;
502
503 return 1;
504}
505
506static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
507{
508 return nonseekable_open(inode, file);
509}
510
511static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
512{
513 return 0;
514}
515
516/*
517 * Notify system
518 */
519
520static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
521{
522 if (code==SYS_DOWN || code==SYS_HALT) {
523 /* Turn the WDT off */
524 usb_pcwd_stop(usb_pcwd_device);
525 }
526
527 return NOTIFY_DONE;
528}
529
530/*
531 * Kernel Interfaces
532 */
533
534static const struct file_operations usb_pcwd_fops = {
535 .owner = THIS_MODULE,
536 .llseek = no_llseek,
537 .write = usb_pcwd_write,
538 .ioctl = usb_pcwd_ioctl,
539 .open = usb_pcwd_open,
540 .release = usb_pcwd_release,
541};
542
543static struct miscdevice usb_pcwd_miscdev = {
544 .minor = WATCHDOG_MINOR,
545 .name = "watchdog",
546 .fops = &usb_pcwd_fops,
547};
548
549static const struct file_operations usb_pcwd_temperature_fops = {
550 .owner = THIS_MODULE,
551 .llseek = no_llseek,
552 .read = usb_pcwd_temperature_read,
553 .open = usb_pcwd_temperature_open,
554 .release = usb_pcwd_temperature_release,
555};
556
557static struct miscdevice usb_pcwd_temperature_miscdev = {
558 .minor = TEMP_MINOR,
559 .name = "temperature",
560 .fops = &usb_pcwd_temperature_fops,
561};
562
563static struct notifier_block usb_pcwd_notifier = {
564 .notifier_call = usb_pcwd_notify_sys,
565};
566
567/**
568 * usb_pcwd_delete
569 */
570static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
571{
572 usb_free_urb(usb_pcwd->intr_urb);
573 if (usb_pcwd->intr_buffer != NULL)
574 usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
575 usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
576 kfree (usb_pcwd);
577}
578
579/**
580 * usb_pcwd_probe
581 *
582 * Called by the usb core when a new device is connected that it thinks
583 * this driver might be interested in.
584 */
585static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
586{
587 struct usb_device *udev = interface_to_usbdev(interface);
588 struct usb_host_interface *iface_desc;
589 struct usb_endpoint_descriptor *endpoint;
590 struct usb_pcwd_private *usb_pcwd = NULL;
591 int pipe, maxp;
592 int retval = -ENOMEM;
593 int got_fw_rev;
594 unsigned char fw_rev_major, fw_rev_minor;
595 char fw_ver_str[20];
596 unsigned char option_switches, dummy;
597
598 cards_found++;
599 if (cards_found > 1) {
600 printk(KERN_ERR PFX "This driver only supports 1 device\n");
601 return -ENODEV;
602 }
603
604 /* get the active interface descriptor */
605 iface_desc = interface->cur_altsetting;
606
607 /* check out that we have a HID device */
608 if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
609 printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
610 return -ENODEV;
611 }
612
613 /* check out the endpoint: it has to be Interrupt & IN */
614 endpoint = &iface_desc->endpoint[0].desc;
615
616 if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
617 ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
618 == USB_ENDPOINT_XFER_INT))) {
619 /* we didn't find a Interrupt endpoint with direction IN */
620 printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
621 return -ENODEV;
622 }
623
624 /* get a handle to the interrupt data pipe */
625 pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
626 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
627
628 /* allocate memory for our device and initialize it */
629 usb_pcwd = kzalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
630 if (usb_pcwd == NULL) {
631 printk(KERN_ERR PFX "Out of memory\n");
632 goto error;
633 }
634
635 usb_pcwd_device = usb_pcwd;
636
637 mutex_init(&usb_pcwd->mtx);
638 usb_pcwd->udev = udev;
639 usb_pcwd->interface = interface;
640 usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
641 usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
642
643 /* set up the memory buffer's */
644 if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) {
645 printk(KERN_ERR PFX "Out of memory\n");
646 goto error;
647 }
648
649 /* allocate the urb's */
650 usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
651 if (!usb_pcwd->intr_urb) {
652 printk(KERN_ERR PFX "Out of memory\n");
653 goto error;
654 }
655
656 /* initialise the intr urb's */
657 usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
658 usb_pcwd->intr_buffer, usb_pcwd->intr_size,
659 usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
660 usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
661 usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
662
663 /* register our interrupt URB with the USB system */
664 if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
665 printk(KERN_ERR PFX "Problem registering interrupt URB\n");
666 retval = -EIO; /* failure */
667 goto error;
668 }
669
670 /* The device exists and can be communicated with */
671 usb_pcwd->exists = 1;
672
673 /* disable card */
674 usb_pcwd_stop(usb_pcwd);
675
676 /* Get the Firmware Version */
677 got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
678 if (got_fw_rev) {
679 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
680 } else {
681 sprintf(fw_ver_str, "<card no answer>");
682 }
683
684 printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
685 fw_ver_str);
686
687 /* Get switch settings */
688 usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &option_switches);
689
690 printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
691 option_switches,
692 ((option_switches & 0x10) ? "ON" : "OFF"),
693 ((option_switches & 0x08) ? "ON" : "OFF"));
694
695 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
696 if (heartbeat == 0)
697 heartbeat = heartbeat_tbl[(option_switches & 0x07)];
698
699 /* Check that the heartbeat value is within it's range ; if not reset to the default */
700 if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
701 usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
702 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
703 WATCHDOG_HEARTBEAT);
704 }
705
706 retval = register_reboot_notifier(&usb_pcwd_notifier);
707 if (retval != 0) {
708 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
709 retval);
710 goto error;
711 }
712
713 retval = misc_register(&usb_pcwd_temperature_miscdev);
714 if (retval != 0) {
715 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
716 TEMP_MINOR, retval);
717 goto err_out_unregister_reboot;
718 }
719
720 retval = misc_register(&usb_pcwd_miscdev);
721 if (retval != 0) {
722 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
723 WATCHDOG_MINOR, retval);
724 goto err_out_misc_deregister;
725 }
726
727 /* we can register the device now, as it is ready */
728 usb_set_intfdata (interface, usb_pcwd);
729
730 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
731 heartbeat, nowayout);
732
733 return 0;
734
735err_out_misc_deregister:
736 misc_deregister(&usb_pcwd_temperature_miscdev);
737err_out_unregister_reboot:
738 unregister_reboot_notifier(&usb_pcwd_notifier);
739error:
740 if (usb_pcwd)
741 usb_pcwd_delete(usb_pcwd);
742 usb_pcwd_device = NULL;
743 return retval;
744}
745
746
747/**
748 * usb_pcwd_disconnect
749 *
750 * Called by the usb core when the device is removed from the system.
751 *
752 * This routine guarantees that the driver will not submit any more urbs
753 * by clearing dev->udev.
754 */
755static void usb_pcwd_disconnect(struct usb_interface *interface)
756{
757 struct usb_pcwd_private *usb_pcwd;
758
759 /* prevent races with open() */
760 mutex_lock(&disconnect_mutex);
761
762 usb_pcwd = usb_get_intfdata (interface);
763 usb_set_intfdata (interface, NULL);
764
765 mutex_lock(&usb_pcwd->mtx);
766
767 /* Stop the timer before we leave */
768 if (!nowayout)
769 usb_pcwd_stop(usb_pcwd);
770
771 /* We should now stop communicating with the USB PCWD device */
772 usb_pcwd->exists = 0;
773
774 /* Deregister */
775 misc_deregister(&usb_pcwd_miscdev);
776 misc_deregister(&usb_pcwd_temperature_miscdev);
777 unregister_reboot_notifier(&usb_pcwd_notifier);
778
779 mutex_unlock(&usb_pcwd->mtx);
780
781 /* Delete the USB PCWD device */
782 usb_pcwd_delete(usb_pcwd);
783
784 cards_found--;
785
786 mutex_unlock(&disconnect_mutex);
787
788 printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
789}
790
791
792
793/**
794 * usb_pcwd_init
795 */
796static int __init usb_pcwd_init(void)
797{
798 int result;
799
800 /* register this driver with the USB subsystem */
801 result = usb_register(&usb_pcwd_driver);
802 if (result) {
803 printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
804 result);
805 return result;
806 }
807
808 printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
809 return 0;
810}
811
812
813/**
814 * usb_pcwd_exit
815 */
816static void __exit usb_pcwd_exit(void)
817{
818 /* deregister this driver with the USB subsystem */
819 usb_deregister(&usb_pcwd_driver);
820}
821
822
823module_init (usb_pcwd_init);
824module_exit (usb_pcwd_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-19 12:10:10 -0500