drivers/watchdog/pcwd_pci.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  *  Berkshire PCI-PC Watchdog Card Driver
0004  *
0005  *  (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
0006  *
0007  *  Based on source code of the following authors:
0008  *    Ken Hollis <kenji@bitgate.com>,
0009  *    Lindsay Harris <lindsay@bluegum.com>,
0010  *    Alan Cox <alan@lxorguk.ukuu.org.uk>,
0011  *    Matt Domsch <Matt_Domsch@dell.com>,
0012  *    Rob Radez <rob@osinvestor.com>
0013  *
0014  *  Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
0015  *  provide warranty for any of this software. This material is
0016  *  provided "AS-IS" and at no charge.
0017  */
0018
0019 /*
0020  *  A bells and whistles driver is available from:
0021  *  http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
0022  *
0023  *  More info available at
0024  *  http://www.berkprod.com/ or http://www.pcwatchdog.com/
0025  */
0026
0027 /*
0028  *  Includes, defines, variables, module parameters, ...
0029  */
0030
0031 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0032
0033 #include <linux/module.h>   /* For module specific items */
0034 #include <linux/moduleparam.h>  /* For new moduleparam's */
0035 #include <linux/types.h>    /* For standard types (like size_t) */
0036 #include <linux/errno.h>    /* For the -ENODEV/... values */
0037 #include <linux/kernel.h>   /* For printk/panic/... */
0038 #include <linux/delay.h>    /* For mdelay function */
0039 #include <linux/miscdevice.h>   /* For struct miscdevice */
0040 #include <linux/watchdog.h> /* For the watchdog specific items */
0041 #include <linux/notifier.h> /* For notifier support */
0042 #include <linux/reboot.h>   /* For reboot_notifier stuff */
0043 #include <linux/init.h>     /* For __init/__exit/... */
0044 #include <linux/fs.h>       /* For file operations */
0045 #include <linux/pci.h>      /* For pci functions */
0046 #include <linux/ioport.h>   /* For io-port access */
0047 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
0048 #include <linux/uaccess.h>  /* For copy_to_user/put_user/... */
0049 #include <linux/io.h>       /* For inb/outb/... */
0050
0051 /* Module and version information */
0052 #define WATCHDOG_VERSION "1.03"
0053 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
0054 #define WATCHDOG_NAME "pcwd_pci"
0055 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION
0056
0057 /* Stuff for the PCI ID's  */
0058 #ifndef PCI_VENDOR_ID_QUICKLOGIC
0059 #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
0060 #endif
0061
0062 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
0063 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
0064 #endif
0065
0066 /*
0067  * These are the defines that describe the control status bits for the
0068  * PCI-PC Watchdog card.
0069  */
0070 /* Port 1 : Control Status #1 */
0071 #define WD_PCI_WTRP     0x01    /* Watchdog Trip status */
0072 #define WD_PCI_HRBT     0x02    /* Watchdog Heartbeat */
0073 #define WD_PCI_TTRP     0x04    /* Temperature Trip status */
0074 #define WD_PCI_RL2A     0x08    /* Relay 2 Active */
0075 #define WD_PCI_RL1A     0x10    /* Relay 1 Active */
0076 #define WD_PCI_R2DS     0x40    /* Relay 2 Disable Temperature-trip /
0077                                     reset */
0078 #define WD_PCI_RLY2     0x80    /* Activate Relay 2 on the board */
0079 /* Port 2 : Control Status #2 */
0080 #define WD_PCI_WDIS     0x10    /* Watchdog Disable */
0081 #define WD_PCI_ENTP     0x20    /* Enable Temperature Trip Reset */
0082 #define WD_PCI_WRSP     0x40    /* Watchdog wrote response */
0083 #define WD_PCI_PCMD     0x80    /* PC has sent command */
0084
0085 /* according to documentation max. time to process a command for the pci
0086  * watchdog card is 100 ms, so we give it 150 ms to do it's job */
0087 #define PCI_COMMAND_TIMEOUT 150
0088
0089 /* Watchdog's internal commands */
0090 #define CMD_GET_STATUS              0x04
0091 #define CMD_GET_FIRMWARE_VERSION        0x08
0092 #define CMD_READ_WATCHDOG_TIMEOUT       0x18
0093 #define CMD_WRITE_WATCHDOG_TIMEOUT      0x19
0094 #define CMD_GET_CLEAR_RESET_COUNT       0x84
0095
0096 /* Watchdog's Dip Switch heartbeat values */
0097 static const int heartbeat_tbl[] = {
0098     5,  /* OFF-OFF-OFF  =  5 Sec  */
0099     10, /* OFF-OFF-ON   = 10 Sec  */
0100     30, /* OFF-ON-OFF   = 30 Sec  */
0101     60, /* OFF-ON-ON    =  1 Min  */
0102     300,    /* ON-OFF-OFF   =  5 Min  */
0103     600,    /* ON-OFF-ON    = 10 Min  */
0104     1800,   /* ON-ON-OFF    = 30 Min  */
0105     3600,   /* ON-ON-ON =  1 hour */
0106 };
0107
0108 /* We can only use 1 card due to the /dev/watchdog restriction */
0109 static int cards_found;
0110
0111 /* internal variables */
0112 static int temp_panic;
0113 static unsigned long is_active;
0114 static char expect_release;
0115 /* this is private data for each PCI-PC watchdog card */
0116 static struct {
0117     /* Wether or not the card has a temperature device */
0118     int supports_temp;
0119     /* The card's boot status */
0120     int boot_status;
0121     /* The cards I/O address */
0122     unsigned long io_addr;
0123     /* the lock for io operations */
0124     spinlock_t io_lock;
0125     /* the PCI-device */
0126     struct pci_dev *pdev;
0127 } pcipcwd_private;
0128
0129 /* module parameters */
0130 #define QUIET   0   /* Default */
0131 #define VERBOSE 1   /* Verbose */
0132 #define DEBUG   2   /* print fancy stuff too */
0133 static int debug = QUIET;
0134 module_param(debug, int, 0);
0135 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
0136
0137 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat =
0138                         delay-time from dip-switches */
0139 static int heartbeat = WATCHDOG_HEARTBEAT;
0140 module_param(heartbeat, int, 0);
0141 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
0142     "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
0143                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
0144
0145 static bool nowayout = WATCHDOG_NOWAYOUT;
0146 module_param(nowayout, bool, 0);
0147 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
0148                     __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
0149
0150 /*
0151  *  Internal functions
0152  */
0153
0154 static int send_command(int cmd, int *msb, int *lsb)
0155 {
0156     int got_response, count;
0157
0158     if (debug >= DEBUG)
0159         pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
0160              cmd, *msb, *lsb);
0161
0162     spin_lock(&pcipcwd_private.io_lock);
0163     /* If a command requires data it should be written first.
0164      * Data for commands with 8 bits of data should be written to port 4.
0165      * Commands with 16 bits of data, should be written as LSB to port 4
0166      * and MSB to port 5.
0167      * After the required data has been written then write the command to
0168      * port 6. */
0169     outb_p(*lsb, pcipcwd_private.io_addr + 4);
0170     outb_p(*msb, pcipcwd_private.io_addr + 5);
0171     outb_p(cmd, pcipcwd_private.io_addr + 6);
0172
0173     /* wait till the pci card processed the command, signaled by
0174      * the WRSP bit in port 2 and give it a max. timeout of
0175      * PCI_COMMAND_TIMEOUT to process */
0176     got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
0177     for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
0178                                 count++) {
0179         mdelay(1);
0180         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
0181     }
0182
0183     if (debug >= DEBUG) {
0184         if (got_response) {
0185             pr_debug("time to process command was: %d ms\n",
0186                  count);
0187         } else {
0188             pr_debug("card did not respond on command!\n");
0189         }
0190     }
0191
0192     if (got_response) {
0193         /* read back response */
0194         *lsb = inb_p(pcipcwd_private.io_addr + 4);
0195         *msb = inb_p(pcipcwd_private.io_addr + 5);
0196
0197         /* clear WRSP bit */
0198         inb_p(pcipcwd_private.io_addr + 6);
0199
0200         if (debug >= DEBUG)
0201             pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
0202                  cmd, *msb, *lsb);
0203     }
0204
0205     spin_unlock(&pcipcwd_private.io_lock);
0206
0207     return got_response;
0208 }
0209
0210 static inline void pcipcwd_check_temperature_support(void)
0211 {
0212     if (inb_p(pcipcwd_private.io_addr) != 0xF0)
0213         pcipcwd_private.supports_temp = 1;
0214 }
0215
0216 static int pcipcwd_get_option_switches(void)
0217 {
0218     int option_switches;
0219
0220     option_switches = inb_p(pcipcwd_private.io_addr + 3);
0221     return option_switches;
0222 }
0223
0224 static void pcipcwd_show_card_info(void)
0225 {
0226     int got_fw_rev, fw_rev_major, fw_rev_minor;
0227     char fw_ver_str[20];        /* The cards firmware version */
0228     int option_switches;
0229
0230     got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
0231                                 &fw_rev_minor);
0232     if (got_fw_rev)
0233         sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
0234     else
0235         sprintf(fw_ver_str, "<card no answer>");
0236
0237     /* Get switch settings */
0238     option_switches = pcipcwd_get_option_switches();
0239
0240     pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n",
0241         (int) pcipcwd_private.io_addr, fw_ver_str,
0242         (pcipcwd_private.supports_temp ? "with" : "without"));
0243
0244     pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
0245         option_switches,
0246         ((option_switches & 0x10) ? "ON" : "OFF"),
0247         ((option_switches & 0x08) ? "ON" : "OFF"));
0248
0249     if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
0250         pr_info("Previous reset was caused by the Watchdog card\n");
0251
0252     if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
0253         pr_info("Card sensed a CPU Overheat\n");
0254
0255     if (pcipcwd_private.boot_status == 0)
0256         pr_info("No previous trip detected - Cold boot or reset\n");
0257 }
0258
0259 static int pcipcwd_start(void)
0260 {
0261     int stat_reg;
0262
0263     spin_lock(&pcipcwd_private.io_lock);
0264     outb_p(0x00, pcipcwd_private.io_addr + 3);
0265     udelay(1000);
0266
0267     stat_reg = inb_p(pcipcwd_private.io_addr + 2);
0268     spin_unlock(&pcipcwd_private.io_lock);
0269
0270     if (stat_reg & WD_PCI_WDIS) {
0271         pr_err("Card timer not enabled\n");
0272         return -1;
0273     }
0274
0275     if (debug >= VERBOSE)
0276         pr_debug("Watchdog started\n");
0277
0278     return 0;
0279 }
0280
0281 static int pcipcwd_stop(void)
0282 {
0283     int stat_reg;
0284
0285     spin_lock(&pcipcwd_private.io_lock);
0286     outb_p(0xA5, pcipcwd_private.io_addr + 3);
0287     udelay(1000);
0288
0289     outb_p(0xA5, pcipcwd_private.io_addr + 3);
0290     udelay(1000);
0291
0292     stat_reg = inb_p(pcipcwd_private.io_addr + 2);
0293     spin_unlock(&pcipcwd_private.io_lock);
0294
0295     if (!(stat_reg & WD_PCI_WDIS)) {
0296         pr_err("Card did not acknowledge disable attempt\n");
0297         return -1;
0298     }
0299
0300     if (debug >= VERBOSE)
0301         pr_debug("Watchdog stopped\n");
0302
0303     return 0;
0304 }
0305
0306 static int pcipcwd_keepalive(void)
0307 {
0308     /* Re-trigger watchdog by writing to port 0 */
0309     spin_lock(&pcipcwd_private.io_lock);
0310     outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
0311     spin_unlock(&pcipcwd_private.io_lock);
0312
0313     if (debug >= DEBUG)
0314         pr_debug("Watchdog keepalive signal send\n");
0315
0316     return 0;
0317 }
0318
0319 static int pcipcwd_set_heartbeat(int t)
0320 {
0321     int t_msb = t / 256;
0322     int t_lsb = t % 256;
0323
0324     if ((t < 0x0001) || (t > 0xFFFF))
0325         return -EINVAL;
0326
0327     /* Write new heartbeat to watchdog */
0328     send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
0329
0330     heartbeat = t;
0331     if (debug >= VERBOSE)
0332         pr_debug("New heartbeat: %d\n", heartbeat);
0333
0334     return 0;
0335 }
0336
0337 static int pcipcwd_get_status(int *status)
0338 {
0339     int control_status;
0340
0341     *status = 0;
0342     control_status = inb_p(pcipcwd_private.io_addr + 1);
0343     if (control_status & WD_PCI_WTRP)
0344         *status |= WDIOF_CARDRESET;
0345     if (control_status & WD_PCI_TTRP) {
0346         *status |= WDIOF_OVERHEAT;
0347         if (temp_panic)
0348             panic(KBUILD_MODNAME ": Temperature overheat trip!\n");
0349     }
0350
0351     if (debug >= DEBUG)
0352         pr_debug("Control Status #1: 0x%02x\n", control_status);
0353
0354     return 0;
0355 }
0356
0357 static int pcipcwd_clear_status(void)
0358 {
0359     int control_status;
0360     int msb;
0361     int reset_counter;
0362
0363     if (debug >= VERBOSE)
0364         pr_info("clearing watchdog trip status & LED\n");
0365
0366     control_status = inb_p(pcipcwd_private.io_addr + 1);
0367
0368     if (debug >= DEBUG) {
0369         pr_debug("status was: 0x%02x\n", control_status);
0370         pr_debug("sending: 0x%02x\n",
0371              (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
0372     }
0373
0374     /* clear trip status & LED and keep mode of relay 2 */
0375     outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
0376                         pcipcwd_private.io_addr + 1);
0377
0378     /* clear reset counter */
0379     msb = 0;
0380     reset_counter = 0xff;
0381     send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
0382
0383     if (debug >= DEBUG) {
0384         pr_debug("reset count was: 0x%02x\n", reset_counter);
0385     }
0386
0387     return 0;
0388 }
0389
0390 static int pcipcwd_get_temperature(int *temperature)
0391 {
0392     *temperature = 0;
0393     if (!pcipcwd_private.supports_temp)
0394         return -ENODEV;
0395
0396     spin_lock(&pcipcwd_private.io_lock);
0397     *temperature = inb_p(pcipcwd_private.io_addr);
0398     spin_unlock(&pcipcwd_private.io_lock);
0399
0400     /*
0401      * Convert celsius to fahrenheit, since this was
0402      * the decided 'standard' for this return value.
0403      */
0404     *temperature = (*temperature * 9 / 5) + 32;
0405
0406     if (debug >= DEBUG) {
0407         pr_debug("temperature is: %d F\n", *temperature);
0408     }
0409
0410     return 0;
0411 }
0412
0413 static int pcipcwd_get_timeleft(int *time_left)
0414 {
0415     int msb;
0416     int lsb;
0417
0418     /* Read the time that's left before rebooting */
0419     /* Note: if the board is not yet armed then we will read 0xFFFF */
0420     send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
0421
0422     *time_left = (msb << 8) + lsb;
0423
0424     if (debug >= VERBOSE)
0425         pr_debug("Time left before next reboot: %d\n", *time_left);
0426
0427     return 0;
0428 }
0429
0430 /*
0431  *  /dev/watchdog handling
0432  */
0433
0434 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
0435                  size_t len, loff_t *ppos)
0436 {
0437     /* See if we got the magic character 'V' and reload the timer */
0438     if (len) {
0439         if (!nowayout) {
0440             size_t i;
0441
0442             /* note: just in case someone wrote the magic character
0443              * five months ago... */
0444             expect_release = 0;
0445
0446             /* scan to see whether or not we got the
0447              * magic character */
0448             for (i = 0; i != len; i++) {
0449                 char c;
0450                 if (get_user(c, data + i))
0451                     return -EFAULT;
0452                 if (c == 'V')
0453                     expect_release = 42;
0454             }
0455         }
0456
0457         /* someone wrote to us, we should reload the timer */
0458         pcipcwd_keepalive();
0459     }
0460     return len;
0461 }
0462
0463 static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
0464                         unsigned long arg)
0465 {
0466     void __user *argp = (void __user *)arg;
0467     int __user *p = argp;
0468     static const struct watchdog_info ident = {
0469         .options =      WDIOF_OVERHEAT |
0470                     WDIOF_CARDRESET |
0471                     WDIOF_KEEPALIVEPING |
0472                     WDIOF_SETTIMEOUT |
0473                     WDIOF_MAGICCLOSE,
0474         .firmware_version = 1,
0475         .identity =     WATCHDOG_DRIVER_NAME,
0476     };
0477
0478     switch (cmd) {
0479     case WDIOC_GETSUPPORT:
0480         return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
0481
0482     case WDIOC_GETSTATUS:
0483     {
0484         int status;
0485         pcipcwd_get_status(&status);
0486         return put_user(status, p);
0487     }
0488
0489     case WDIOC_GETBOOTSTATUS:
0490         return put_user(pcipcwd_private.boot_status, p);
0491
0492     case WDIOC_GETTEMP:
0493     {
0494         int temperature;
0495
0496         if (pcipcwd_get_temperature(&temperature))
0497             return -EFAULT;
0498
0499         return put_user(temperature, p);
0500     }
0501
0502     case WDIOC_SETOPTIONS:
0503     {
0504         int new_options, retval = -EINVAL;
0505
0506         if (get_user(new_options, p))
0507             return -EFAULT;
0508
0509         if (new_options & WDIOS_DISABLECARD) {
0510             if (pcipcwd_stop())
0511                 return -EIO;
0512             retval = 0;
0513         }
0514
0515         if (new_options & WDIOS_ENABLECARD) {
0516             if (pcipcwd_start())
0517                 return -EIO;
0518             retval = 0;
0519         }
0520
0521         if (new_options & WDIOS_TEMPPANIC) {
0522             temp_panic = 1;
0523             retval = 0;
0524         }
0525
0526         return retval;
0527     }
0528
0529     case WDIOC_KEEPALIVE:
0530         pcipcwd_keepalive();
0531         return 0;
0532
0533     case WDIOC_SETTIMEOUT:
0534     {
0535         int new_heartbeat;
0536
0537         if (get_user(new_heartbeat, p))
0538             return -EFAULT;
0539
0540         if (pcipcwd_set_heartbeat(new_heartbeat))
0541             return -EINVAL;
0542
0543         pcipcwd_keepalive();
0544     }
0545         fallthrough;
0546
0547     case WDIOC_GETTIMEOUT:
0548         return put_user(heartbeat, p);
0549
0550     case WDIOC_GETTIMELEFT:
0551     {
0552         int time_left;
0553
0554         if (pcipcwd_get_timeleft(&time_left))
0555             return -EFAULT;
0556
0557         return put_user(time_left, p);
0558     }
0559
0560     default:
0561         return -ENOTTY;
0562     }
0563 }
0564
0565 static int pcipcwd_open(struct inode *inode, struct file *file)
0566 {
0567     /* /dev/watchdog can only be opened once */
0568     if (test_and_set_bit(0, &is_active)) {
0569         if (debug >= VERBOSE)
0570             pr_err("Attempt to open already opened device\n");
0571         return -EBUSY;
0572     }
0573
0574     /* Activate */
0575     pcipcwd_start();
0576     pcipcwd_keepalive();
0577     return stream_open(inode, file);
0578 }
0579
0580 static int pcipcwd_release(struct inode *inode, struct file *file)
0581 {
0582     /*
0583      *      Shut off the timer.
0584      */
0585     if (expect_release == 42) {
0586         pcipcwd_stop();
0587     } else {
0588         pr_crit("Unexpected close, not stopping watchdog!\n");
0589         pcipcwd_keepalive();
0590     }
0591     expect_release = 0;
0592     clear_bit(0, &is_active);
0593     return 0;
0594 }
0595
0596 /*
0597  *  /dev/temperature handling
0598  */
0599
0600 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
0601                 size_t len, loff_t *ppos)
0602 {
0603     int temperature;
0604
0605     if (pcipcwd_get_temperature(&temperature))
0606         return -EFAULT;
0607
0608     if (copy_to_user(data, &temperature, 1))
0609         return -EFAULT;
0610
0611     return 1;
0612 }
0613
0614 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
0615 {
0616     if (!pcipcwd_private.supports_temp)
0617         return -ENODEV;
0618
0619     return stream_open(inode, file);
0620 }
0621
0622 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
0623 {
0624     return 0;
0625 }
0626
0627 /*
0628  *  Notify system
0629  */
0630
0631 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
0632                                 void *unused)
0633 {
0634     if (code == SYS_DOWN || code == SYS_HALT)
0635         pcipcwd_stop(); /* Turn the WDT off */
0636
0637     return NOTIFY_DONE;
0638 }
0639
0640 /*
0641  *  Kernel Interfaces
0642  */
0643
0644 static const struct file_operations pcipcwd_fops = {
0645     .owner =    THIS_MODULE,
0646     .llseek =   no_llseek,
0647     .write =    pcipcwd_write,
0648     .unlocked_ioctl = pcipcwd_ioctl,
0649     .compat_ioctl = compat_ptr_ioctl,
0650     .open =     pcipcwd_open,
0651     .release =  pcipcwd_release,
0652 };
0653
0654 static struct miscdevice pcipcwd_miscdev = {
0655     .minor =    WATCHDOG_MINOR,
0656     .name =     "watchdog",
0657     .fops =     &pcipcwd_fops,
0658 };
0659
0660 static const struct file_operations pcipcwd_temp_fops = {
0661     .owner =    THIS_MODULE,
0662     .llseek =   no_llseek,
0663     .read =     pcipcwd_temp_read,
0664     .open =     pcipcwd_temp_open,
0665     .release =  pcipcwd_temp_release,
0666 };
0667
0668 static struct miscdevice pcipcwd_temp_miscdev = {
0669     .minor =    TEMP_MINOR,
0670     .name =     "temperature",
0671     .fops =     &pcipcwd_temp_fops,
0672 };
0673
0674 static struct notifier_block pcipcwd_notifier = {
0675     .notifier_call =    pcipcwd_notify_sys,
0676 };
0677
0678 /*
0679  *  Init & exit routines
0680  */
0681
0682 static int pcipcwd_card_init(struct pci_dev *pdev,
0683         const struct pci_device_id *ent)
0684 {
0685     int ret = -EIO;
0686
0687     cards_found++;
0688     if (cards_found == 1)
0689         pr_info("%s\n", DRIVER_VERSION);
0690
0691     if (cards_found > 1) {
0692         pr_err("This driver only supports 1 device\n");
0693         return -ENODEV;
0694     }
0695
0696     if (pci_enable_device(pdev)) {
0697         pr_err("Not possible to enable PCI Device\n");
0698         return -ENODEV;
0699     }
0700
0701     if (pci_resource_start(pdev, 0) == 0x0000) {
0702         pr_err("No I/O-Address for card detected\n");
0703         ret = -ENODEV;
0704         goto err_out_disable_device;
0705     }
0706
0707     spin_lock_init(&pcipcwd_private.io_lock);
0708     pcipcwd_private.pdev = pdev;
0709     pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
0710
0711     if (pci_request_regions(pdev, WATCHDOG_NAME)) {
0712         pr_err("I/O address 0x%04x already in use\n",
0713                (int) pcipcwd_private.io_addr);
0714         ret = -EIO;
0715         goto err_out_disable_device;
0716     }
0717
0718     /* get the boot_status */
0719     pcipcwd_get_status(&pcipcwd_private.boot_status);
0720
0721     /* clear the "card caused reboot" flag */
0722     pcipcwd_clear_status();
0723
0724     /* disable card */
0725     pcipcwd_stop();
0726
0727     /* Check whether or not the card supports the temperature device */
0728     pcipcwd_check_temperature_support();
0729
0730     /* Show info about the card itself */
0731     pcipcwd_show_card_info();
0732
0733     /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
0734     if (heartbeat == 0)
0735         heartbeat =
0736             heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
0737
0738     /* Check that the heartbeat value is within it's range ;
0739      * if not reset to the default */
0740     if (pcipcwd_set_heartbeat(heartbeat)) {
0741         pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
0742         pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
0743             WATCHDOG_HEARTBEAT);
0744     }
0745
0746     ret = register_reboot_notifier(&pcipcwd_notifier);
0747     if (ret != 0) {
0748         pr_err("cannot register reboot notifier (err=%d)\n", ret);
0749         goto err_out_release_region;
0750     }
0751
0752     if (pcipcwd_private.supports_temp) {
0753         ret = misc_register(&pcipcwd_temp_miscdev);
0754         if (ret != 0) {
0755             pr_err("cannot register miscdev on minor=%d (err=%d)\n",
0756                    TEMP_MINOR, ret);
0757             goto err_out_unregister_reboot;
0758         }
0759     }
0760
0761     ret = misc_register(&pcipcwd_miscdev);
0762     if (ret != 0) {
0763         pr_err("cannot register miscdev on minor=%d (err=%d)\n",
0764                WATCHDOG_MINOR, ret);
0765         goto err_out_misc_deregister;
0766     }
0767
0768     pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
0769         heartbeat, nowayout);
0770
0771     return 0;
0772
0773 err_out_misc_deregister:
0774     if (pcipcwd_private.supports_temp)
0775         misc_deregister(&pcipcwd_temp_miscdev);
0776 err_out_unregister_reboot:
0777     unregister_reboot_notifier(&pcipcwd_notifier);
0778 err_out_release_region:
0779     pci_release_regions(pdev);
0780 err_out_disable_device:
0781     pci_disable_device(pdev);
0782     return ret;
0783 }
0784
0785 static void pcipcwd_card_exit(struct pci_dev *pdev)
0786 {
0787     /* Stop the timer before we leave */
0788     if (!nowayout)
0789         pcipcwd_stop();
0790
0791     /* Deregister */
0792     misc_deregister(&pcipcwd_miscdev);
0793     if (pcipcwd_private.supports_temp)
0794         misc_deregister(&pcipcwd_temp_miscdev);
0795     unregister_reboot_notifier(&pcipcwd_notifier);
0796     pci_release_regions(pdev);
0797     pci_disable_device(pdev);
0798     cards_found--;
0799 }
0800
0801 static const struct pci_device_id pcipcwd_pci_tbl[] = {
0802     { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
0803         PCI_ANY_ID, PCI_ANY_ID, },
0804     { 0 },          /* End of list */
0805 };
0806 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
0807
0808 static struct pci_driver pcipcwd_driver = {
0809     .name       = WATCHDOG_NAME,
0810     .id_table   = pcipcwd_pci_tbl,
0811     .probe      = pcipcwd_card_init,
0812     .remove     = pcipcwd_card_exit,
0813 };
0814
0815 module_pci_driver(pcipcwd_driver);
0816
0817 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
0818 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
0819 MODULE_LICENSE("GPL");