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path: root/drivers/watchdog/pcwd.c
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Diffstat (limited to 'drivers/watchdog/pcwd.c')
-rw-r--r--drivers/watchdog/pcwd.c1013
1 files changed, 1013 insertions, 0 deletions
diff --git a/drivers/watchdog/pcwd.c b/drivers/watchdog/pcwd.c
new file mode 100644
index 000000000..e936f15dc
--- /dev/null
+++ b/drivers/watchdog/pcwd.c
@@ -0,0 +1,1013 @@
+/*
+ * PC Watchdog Driver
+ * by Ken Hollis (khollis@bitgate.com)
+ *
+ * Permission granted from Simon Machell (smachell@berkprod.com)
+ * Written for the Linux Kernel, and GPLed by Ken Hollis
+ *
+ * 960107 Added request_region routines, modulized the whole thing.
+ * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added
+ * WD_TIMEOUT define.
+ * 960216 Added eof marker on the file, and changed verbose messages.
+ * 960716 Made functional and cosmetic changes to the source for
+ * inclusion in Linux 2.0.x kernels, thanks to Alan Cox.
+ * 960717 Removed read/seek routines, replaced with ioctl. Also, added
+ * check_region command due to Alan's suggestion.
+ * 960821 Made changes to compile in newer 2.0.x kernels. Added
+ * "cold reboot sense" entry.
+ * 960825 Made a few changes to code, deleted some defines and made
+ * typedefs to replace them. Made heartbeat reset only available
+ * via ioctl, and removed the write routine.
+ * 960828 Added new items for PC Watchdog Rev.C card.
+ * 960829 Changed around all of the IOCTLs, added new features,
+ * added watchdog disable/re-enable routines. Added firmware
+ * version reporting. Added read routine for temperature.
+ * Removed some extra defines, added an autodetect Revision
+ * routine.
+ * 961006 Revised some documentation, fixed some cosmetic bugs. Made
+ * drivers to panic the system if it's overheating at bootup.
+ * 961118 Changed some verbiage on some of the output, tidied up
+ * code bits, and added compatibility to 2.1.x.
+ * 970912 Enabled board on open and disable on close.
+ * 971107 Took account of recent VFS changes (broke read).
+ * 971210 Disable board on initialisation in case board already ticking.
+ * 971222 Changed open/close for temperature handling
+ * Michael Meskes <meskes@debian.org>.
+ * 980112 Used minor numbers from include/linux/miscdevice.h
+ * 990403 Clear reset status after reading control status register in
+ * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>]
+ * 990605 Made changes to code to support Firmware 1.22a, added
+ * fairly useless proc entry.
+ * 990610 removed said useless proc code for the merge <alan>
+ * 000403 Removed last traces of proc code. <davej>
+ * 011214 Added nowayout module option to override
+ * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
+ * Added timeout module option to override default
+ */
+
+/*
+ * A bells and whistles driver is available from http://www.pcwd.de/
+ * More info available at http://www.berkprod.com/ or
+ * http://www.pcwatchdog.com/
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h> /* For module specific items */
+#include <linux/moduleparam.h> /* For new moduleparam's */
+#include <linux/types.h> /* For standard types (like size_t) */
+#include <linux/errno.h> /* For the -ENODEV/... values */
+#include <linux/kernel.h> /* For printk/panic/... */
+#include <linux/delay.h> /* For mdelay function */
+#include <linux/timer.h> /* For timer related operations */
+#include <linux/jiffies.h> /* For jiffies stuff */
+#include <linux/miscdevice.h> /* For struct miscdevice */
+#include <linux/watchdog.h> /* For the watchdog specific items */
+#include <linux/reboot.h> /* For kernel_power_off() */
+#include <linux/init.h> /* For __init/__exit/... */
+#include <linux/fs.h> /* For file operations */
+#include <linux/isa.h> /* For isa devices */
+#include <linux/ioport.h> /* For io-port access */
+#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
+#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
+#include <linux/io.h> /* For inb/outb/... */
+
+/* Module and version information */
+#define WATCHDOG_VERSION "1.20"
+#define WATCHDOG_DATE "18 Feb 2007"
+#define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
+#define WATCHDOG_NAME "pcwd"
+#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
+
+/*
+ * It should be noted that PCWD_REVISION_B was removed because A and B
+ * are essentially the same types of card, with the exception that B
+ * has temperature reporting. Since I didn't receive a Rev.B card,
+ * the Rev.B card is not supported. (It's a good thing too, as they
+ * are no longer in production.)
+ */
+#define PCWD_REVISION_A 1
+#define PCWD_REVISION_C 2
+
+/*
+ * These are the auto-probe addresses available.
+ *
+ * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
+ * Revision A has an address range of 2 addresses, while Revision C has 4.
+ */
+#define PCWD_ISA_NR_CARDS 3
+static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
+
+/*
+ * These are the defines that describe the control status bits for the
+ * PCI-PC Watchdog card.
+*/
+/* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
+#define WD_WDRST 0x01 /* Previously reset state */
+#define WD_T110 0x02 /* Temperature overheat sense */
+#define WD_HRTBT 0x04 /* Heartbeat sense */
+#define WD_RLY2 0x08 /* External relay triggered */
+#define WD_SRLY2 0x80 /* Software external relay triggered */
+/* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */
+#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
+#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
+#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
+#define WD_REVC_RL2A 0x08 /* Relay 2 activated by
+ on-board processor */
+#define WD_REVC_RL1A 0x10 /* Relay 1 active */
+#define WD_REVC_R2DS 0x40 /* Relay 2 disable */
+#define WD_REVC_RLY2 0x80 /* Relay 2 activated? */
+/* Port 2 : Control Status #2 */
+#define WD_WDIS 0x10 /* Watchdog Disabled */
+#define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */
+#define WD_SSEL 0x40 /* Watchdog Switch Select
+ (1:SW1 <-> 0:SW2) */
+#define WD_WCMD 0x80 /* Watchdog Command Mode */
+
+/* max. time we give an ISA watchdog card to process a command */
+/* 500ms for each 4 bit response (according to spec.) */
+#define ISA_COMMAND_TIMEOUT 1000
+
+/* Watchdog's internal commands */
+#define CMD_ISA_IDLE 0x00
+#define CMD_ISA_VERSION_INTEGER 0x01
+#define CMD_ISA_VERSION_TENTH 0x02
+#define CMD_ISA_VERSION_HUNDRETH 0x03
+#define CMD_ISA_VERSION_MINOR 0x04
+#define CMD_ISA_SWITCH_SETTINGS 0x05
+#define CMD_ISA_RESET_PC 0x06
+#define CMD_ISA_ARM_0 0x07
+#define CMD_ISA_ARM_30 0x08
+#define CMD_ISA_ARM_60 0x09
+#define CMD_ISA_DELAY_TIME_2SECS 0x0A
+#define CMD_ISA_DELAY_TIME_4SECS 0x0B
+#define CMD_ISA_DELAY_TIME_8SECS 0x0C
+#define CMD_ISA_RESET_RELAYS 0x0D
+
+/* Watchdog's Dip Switch heartbeat values */
+static const int heartbeat_tbl[] = {
+ 20, /* OFF-OFF-OFF = 20 Sec */
+ 40, /* OFF-OFF-ON = 40 Sec */
+ 60, /* OFF-ON-OFF = 1 Min */
+ 300, /* OFF-ON-ON = 5 Min */
+ 600, /* ON-OFF-OFF = 10 Min */
+ 1800, /* ON-OFF-ON = 30 Min */
+ 3600, /* ON-ON-OFF = 1 Hour */
+ 7200, /* ON-ON-ON = 2 hour */
+};
+
+/*
+ * We are using an kernel timer to do the pinging of the watchdog
+ * every ~500ms. We try to set the internal heartbeat of the
+ * watchdog to 2 ms.
+ */
+
+#define WDT_INTERVAL (HZ/2+1)
+
+/* We can only use 1 card due to the /dev/watchdog restriction */
+static int cards_found;
+
+/* internal variables */
+static unsigned long open_allowed;
+static char expect_close;
+static int temp_panic;
+
+/* this is private data for each ISA-PC watchdog card */
+static struct {
+ char fw_ver_str[6]; /* The cards firmware version */
+ int revision; /* The card's revision */
+ int supports_temp; /* Whether or not the card has
+ a temperature device */
+ int command_mode; /* Whether or not the card is in
+ command mode */
+ int boot_status; /* The card's boot status */
+ int io_addr; /* The cards I/O address */
+ spinlock_t io_lock; /* the lock for io operations */
+ struct timer_list timer; /* The timer that pings the watchdog */
+ unsigned long next_heartbeat; /* the next_heartbeat for the timer */
+} pcwd_private;
+
+/* module parameters */
+#define QUIET 0 /* Default */
+#define VERBOSE 1 /* Verbose */
+#define DEBUG 2 /* print fancy stuff too */
+static int debug = QUIET;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug,
+ "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
+
+/* default heartbeat = delay-time from dip-switches */
+#define WATCHDOG_HEARTBEAT 0
+static int heartbeat = WATCHDOG_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
+ "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default="
+ __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/*
+ * Internal functions
+ */
+
+static int send_isa_command(int cmd)
+{
+ int i;
+ int control_status;
+ int port0, last_port0; /* Double read for stabilising */
+
+ if (debug >= DEBUG)
+ pr_debug("sending following data cmd=0x%02x\n", cmd);
+
+ /* The WCMD bit must be 1 and the command is only 4 bits in size */
+ control_status = (cmd & 0x0F) | WD_WCMD;
+ outb_p(control_status, pcwd_private.io_addr + 2);
+ udelay(ISA_COMMAND_TIMEOUT);
+
+ port0 = inb_p(pcwd_private.io_addr);
+ for (i = 0; i < 25; ++i) {
+ last_port0 = port0;
+ port0 = inb_p(pcwd_private.io_addr);
+
+ if (port0 == last_port0)
+ break; /* Data is stable */
+
+ udelay(250);
+ }
+
+ if (debug >= DEBUG)
+ pr_debug("received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n",
+ cmd, port0, last_port0);
+
+ return port0;
+}
+
+static int set_command_mode(void)
+{
+ int i, found = 0, count = 0;
+
+ /* Set the card into command mode */
+ spin_lock(&pcwd_private.io_lock);
+ while ((!found) && (count < 3)) {
+ i = send_isa_command(CMD_ISA_IDLE);
+
+ if (i == 0x00)
+ found = 1;
+ else if (i == 0xF3) {
+ /* Card does not like what we've done to it */
+ outb_p(0x00, pcwd_private.io_addr + 2);
+ udelay(1200); /* Spec says wait 1ms */
+ outb_p(0x00, pcwd_private.io_addr + 2);
+ udelay(ISA_COMMAND_TIMEOUT);
+ }
+ count++;
+ }
+ spin_unlock(&pcwd_private.io_lock);
+ pcwd_private.command_mode = found;
+
+ if (debug >= DEBUG)
+ pr_debug("command_mode=%d\n", pcwd_private.command_mode);
+
+ return found;
+}
+
+static void unset_command_mode(void)
+{
+ /* Set the card into normal mode */
+ spin_lock(&pcwd_private.io_lock);
+ outb_p(0x00, pcwd_private.io_addr + 2);
+ udelay(ISA_COMMAND_TIMEOUT);
+ spin_unlock(&pcwd_private.io_lock);
+
+ pcwd_private.command_mode = 0;
+
+ if (debug >= DEBUG)
+ pr_debug("command_mode=%d\n", pcwd_private.command_mode);
+}
+
+static inline void pcwd_check_temperature_support(void)
+{
+ if (inb(pcwd_private.io_addr) != 0xF0)
+ pcwd_private.supports_temp = 1;
+}
+
+static inline void pcwd_get_firmware(void)
+{
+ int one, ten, hund, minor;
+
+ strcpy(pcwd_private.fw_ver_str, "ERROR");
+
+ if (set_command_mode()) {
+ one = send_isa_command(CMD_ISA_VERSION_INTEGER);
+ ten = send_isa_command(CMD_ISA_VERSION_TENTH);
+ hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
+ minor = send_isa_command(CMD_ISA_VERSION_MINOR);
+ sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c",
+ one, ten, hund, minor);
+ }
+ unset_command_mode();
+
+ return;
+}
+
+static inline int pcwd_get_option_switches(void)
+{
+ int option_switches = 0;
+
+ if (set_command_mode()) {
+ /* Get switch settings */
+ option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
+ }
+
+ unset_command_mode();
+ return option_switches;
+}
+
+static void pcwd_show_card_info(void)
+{
+ int option_switches;
+
+ /* Get some extra info from the hardware (in command/debug/diag mode) */
+ if (pcwd_private.revision == PCWD_REVISION_A)
+ pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",
+ pcwd_private.io_addr);
+ else if (pcwd_private.revision == PCWD_REVISION_C) {
+ pcwd_get_firmware();
+ pr_info("ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
+ pcwd_private.io_addr, pcwd_private.fw_ver_str);
+ option_switches = pcwd_get_option_switches();
+ pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
+ option_switches,
+ ((option_switches & 0x10) ? "ON" : "OFF"),
+ ((option_switches & 0x08) ? "ON" : "OFF"));
+
+ /* Reprogram internal heartbeat to 2 seconds */
+ if (set_command_mode()) {
+ send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
+ unset_command_mode();
+ }
+ }
+
+ if (pcwd_private.supports_temp)
+ pr_info("Temperature Option Detected\n");
+
+ if (pcwd_private.boot_status & WDIOF_CARDRESET)
+ pr_info("Previous reboot was caused by the card\n");
+
+ if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
+ pr_emerg("Card senses a CPU Overheat. Panicking!\n");
+ pr_emerg("CPU Overheat\n");
+ }
+
+ if (pcwd_private.boot_status == 0)
+ pr_info("No previous trip detected - Cold boot or reset\n");
+}
+
+static void pcwd_timer_ping(unsigned long data)
+{
+ int wdrst_stat;
+
+ /* If we got a heartbeat pulse within the WDT_INTERVAL
+ * we agree to ping the WDT */
+ if (time_before(jiffies, pcwd_private.next_heartbeat)) {
+ /* Ping the watchdog */
+ spin_lock(&pcwd_private.io_lock);
+ if (pcwd_private.revision == PCWD_REVISION_A) {
+ /* Rev A cards are reset by setting the
+ WD_WDRST bit in register 1 */
+ wdrst_stat = inb_p(pcwd_private.io_addr);
+ wdrst_stat &= 0x0F;
+ wdrst_stat |= WD_WDRST;
+
+ outb_p(wdrst_stat, pcwd_private.io_addr + 1);
+ } else {
+ /* Re-trigger watchdog by writing to port 0 */
+ outb_p(0x00, pcwd_private.io_addr);
+ }
+
+ /* Re-set the timer interval */
+ mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
+
+ spin_unlock(&pcwd_private.io_lock);
+ } else {
+ pr_warn("Heartbeat lost! Will not ping the watchdog\n");
+ }
+}
+
+static int pcwd_start(void)
+{
+ int stat_reg;
+
+ pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
+
+ /* Start the timer */
+ mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
+
+ /* Enable the port */
+ if (pcwd_private.revision == PCWD_REVISION_C) {
+ spin_lock(&pcwd_private.io_lock);
+ outb_p(0x00, pcwd_private.io_addr + 3);
+ udelay(ISA_COMMAND_TIMEOUT);
+ stat_reg = inb_p(pcwd_private.io_addr + 2);
+ spin_unlock(&pcwd_private.io_lock);
+ if (stat_reg & WD_WDIS) {
+ pr_info("Could not start watchdog\n");
+ return -EIO;
+ }
+ }
+
+ if (debug >= VERBOSE)
+ pr_debug("Watchdog started\n");
+
+ return 0;
+}
+
+static int pcwd_stop(void)
+{
+ int stat_reg;
+
+ /* Stop the timer */
+ del_timer(&pcwd_private.timer);
+
+ /* Disable the board */
+ if (pcwd_private.revision == PCWD_REVISION_C) {
+ spin_lock(&pcwd_private.io_lock);
+ outb_p(0xA5, pcwd_private.io_addr + 3);
+ udelay(ISA_COMMAND_TIMEOUT);
+ outb_p(0xA5, pcwd_private.io_addr + 3);
+ udelay(ISA_COMMAND_TIMEOUT);
+ stat_reg = inb_p(pcwd_private.io_addr + 2);
+ spin_unlock(&pcwd_private.io_lock);
+ if ((stat_reg & WD_WDIS) == 0) {
+ pr_info("Could not stop watchdog\n");
+ return -EIO;
+ }
+ }
+
+ if (debug >= VERBOSE)
+ pr_debug("Watchdog stopped\n");
+
+ return 0;
+}
+
+static int pcwd_keepalive(void)
+{
+ /* user land ping */
+ pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
+
+ if (debug >= DEBUG)
+ pr_debug("Watchdog keepalive signal send\n");
+
+ return 0;
+}
+
+static int pcwd_set_heartbeat(int t)
+{
+ if (t < 2 || t > 7200) /* arbitrary upper limit */
+ return -EINVAL;
+
+ heartbeat = t;
+
+ if (debug >= VERBOSE)
+ pr_debug("New heartbeat: %d\n", heartbeat);
+
+ return 0;
+}
+
+static int pcwd_get_status(int *status)
+{
+ int control_status;
+
+ *status = 0;
+ spin_lock(&pcwd_private.io_lock);
+ if (pcwd_private.revision == PCWD_REVISION_A)
+ /* Rev A cards return status information from
+ * the base register, which is used for the
+ * temperature in other cards. */
+ control_status = inb(pcwd_private.io_addr);
+ else {
+ /* Rev C cards return card status in the base
+ * address + 1 register. And use different bits
+ * to indicate a card initiated reset, and an
+ * over-temperature condition. And the reboot
+ * status can be reset. */
+ control_status = inb(pcwd_private.io_addr + 1);
+ }
+ spin_unlock(&pcwd_private.io_lock);
+
+ if (pcwd_private.revision == PCWD_REVISION_A) {
+ if (control_status & WD_WDRST)
+ *status |= WDIOF_CARDRESET;
+
+ if (control_status & WD_T110) {
+ *status |= WDIOF_OVERHEAT;
+ if (temp_panic) {
+ pr_info("Temperature overheat trip!\n");
+ kernel_power_off();
+ }
+ }
+ } else {
+ if (control_status & WD_REVC_WTRP)
+ *status |= WDIOF_CARDRESET;
+
+ if (control_status & WD_REVC_TTRP) {
+ *status |= WDIOF_OVERHEAT;
+ if (temp_panic) {
+ pr_info("Temperature overheat trip!\n");
+ kernel_power_off();
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int pcwd_clear_status(void)
+{
+ int control_status;
+
+ if (pcwd_private.revision == PCWD_REVISION_C) {
+ spin_lock(&pcwd_private.io_lock);
+
+ if (debug >= VERBOSE)
+ pr_info("clearing watchdog trip status\n");
+
+ control_status = inb_p(pcwd_private.io_addr + 1);
+
+ if (debug >= DEBUG) {
+ pr_debug("status was: 0x%02x\n", control_status);
+ pr_debug("sending: 0x%02x\n",
+ (control_status & WD_REVC_R2DS));
+ }
+
+ /* clear reset status & Keep Relay 2 disable state as it is */
+ outb_p((control_status & WD_REVC_R2DS),
+ pcwd_private.io_addr + 1);
+
+ spin_unlock(&pcwd_private.io_lock);
+ }
+ return 0;
+}
+
+static int pcwd_get_temperature(int *temperature)
+{
+ /* check that port 0 gives temperature info and no command results */
+ if (pcwd_private.command_mode)
+ return -1;
+
+ *temperature = 0;
+ if (!pcwd_private.supports_temp)
+ return -ENODEV;
+
+ /*
+ * Convert celsius to fahrenheit, since this was
+ * the decided 'standard' for this return value.
+ */
+ spin_lock(&pcwd_private.io_lock);
+ *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32;
+ spin_unlock(&pcwd_private.io_lock);
+
+ if (debug >= DEBUG) {
+ pr_debug("temperature is: %d F\n", *temperature);
+ }
+
+ return 0;
+}
+
+/*
+ * /dev/watchdog handling
+ */
+
+static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int rv;
+ int status;
+ int temperature;
+ int new_heartbeat;
+ int __user *argp = (int __user *)arg;
+ static const struct watchdog_info ident = {
+ .options = WDIOF_OVERHEAT |
+ WDIOF_CARDRESET |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_SETTIMEOUT |
+ WDIOF_MAGICCLOSE,
+ .firmware_version = 1,
+ .identity = "PCWD",
+ };
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ return 0;
+
+ case WDIOC_GETSTATUS:
+ pcwd_get_status(&status);
+ return put_user(status, argp);
+
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(pcwd_private.boot_status, argp);
+
+ case WDIOC_GETTEMP:
+ if (pcwd_get_temperature(&temperature))
+ return -EFAULT;
+
+ return put_user(temperature, argp);
+
+ case WDIOC_SETOPTIONS:
+ if (pcwd_private.revision == PCWD_REVISION_C) {
+ if (get_user(rv, argp))
+ return -EFAULT;
+
+ if (rv & WDIOS_DISABLECARD) {
+ status = pcwd_stop();
+ if (status < 0)
+ return status;
+ }
+ if (rv & WDIOS_ENABLECARD) {
+ status = pcwd_start();
+ if (status < 0)
+ return status;
+ }
+ if (rv & WDIOS_TEMPPANIC)
+ temp_panic = 1;
+ }
+ return -EINVAL;
+
+ case WDIOC_KEEPALIVE:
+ pcwd_keepalive();
+ return 0;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_heartbeat, argp))
+ return -EFAULT;
+
+ if (pcwd_set_heartbeat(new_heartbeat))
+ return -EINVAL;
+
+ pcwd_keepalive();
+ /* Fall */
+
+ case WDIOC_GETTIMEOUT:
+ return put_user(heartbeat, argp);
+
+ default:
+ return -ENOTTY;
+ }
+
+ return 0;
+}
+
+static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
+ loff_t *ppos)
+{
+ if (len) {
+ if (!nowayout) {
+ size_t i;
+
+ /* In case it was set long ago */
+ expect_close = 0;
+
+ for (i = 0; i != len; i++) {
+ char c;
+
+ if (get_user(c, buf + i))
+ return -EFAULT;
+ if (c == 'V')
+ expect_close = 42;
+ }
+ }
+ pcwd_keepalive();
+ }
+ return len;
+}
+
+static int pcwd_open(struct inode *inode, struct file *file)
+{
+ if (test_and_set_bit(0, &open_allowed))
+ return -EBUSY;
+ if (nowayout)
+ __module_get(THIS_MODULE);
+ /* Activate */
+ pcwd_start();
+ pcwd_keepalive();
+ return nonseekable_open(inode, file);
+}
+
+static int pcwd_close(struct inode *inode, struct file *file)
+{
+ if (expect_close == 42)
+ pcwd_stop();
+ else {
+ pr_crit("Unexpected close, not stopping watchdog!\n");
+ pcwd_keepalive();
+ }
+ expect_close = 0;
+ clear_bit(0, &open_allowed);
+ return 0;
+}
+
+/*
+ * /dev/temperature handling
+ */
+
+static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ int temperature;
+
+ if (pcwd_get_temperature(&temperature))
+ return -EFAULT;
+
+ if (copy_to_user(buf, &temperature, 1))
+ return -EFAULT;
+
+ return 1;
+}
+
+static int pcwd_temp_open(struct inode *inode, struct file *file)
+{
+ if (!pcwd_private.supports_temp)
+ return -ENODEV;
+
+ return nonseekable_open(inode, file);
+}
+
+static int pcwd_temp_close(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+/*
+ * Kernel Interfaces
+ */
+
+static const struct file_operations pcwd_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = pcwd_write,
+ .unlocked_ioctl = pcwd_ioctl,
+ .open = pcwd_open,
+ .release = pcwd_close,
+};
+
+static struct miscdevice pcwd_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &pcwd_fops,
+};
+
+static const struct file_operations pcwd_temp_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = pcwd_temp_read,
+ .open = pcwd_temp_open,
+ .release = pcwd_temp_close,
+};
+
+static struct miscdevice temp_miscdev = {
+ .minor = TEMP_MINOR,
+ .name = "temperature",
+ .fops = &pcwd_temp_fops,
+};
+
+/*
+ * Init & exit routines
+ */
+
+static inline int get_revision(void)
+{
+ int r = PCWD_REVISION_C;
+
+ spin_lock(&pcwd_private.io_lock);
+ /* REV A cards use only 2 io ports; test
+ * presumes a floating bus reads as 0xff. */
+ if ((inb(pcwd_private.io_addr + 2) == 0xFF) ||
+ (inb(pcwd_private.io_addr + 3) == 0xFF))
+ r = PCWD_REVISION_A;
+ spin_unlock(&pcwd_private.io_lock);
+
+ return r;
+}
+
+/*
+ * The ISA cards have a heartbeat bit in one of the registers, which
+ * register is card dependent. The heartbeat bit is monitored, and if
+ * found, is considered proof that a Berkshire card has been found.
+ * The initial rate is once per second at board start up, then twice
+ * per second for normal operation.
+ */
+static int pcwd_isa_match(struct device *dev, unsigned int id)
+{
+ int base_addr = pcwd_ioports[id];
+ int port0, last_port0; /* Reg 0, in case it's REV A */
+ int port1, last_port1; /* Register 1 for REV C cards */
+ int i;
+ int retval;
+
+ if (debug >= DEBUG)
+ pr_debug("pcwd_isa_match id=%d\n", id);
+
+ if (!request_region(base_addr, 4, "PCWD")) {
+ pr_info("Port 0x%04x unavailable\n", base_addr);
+ return 0;
+ }
+
+ retval = 0;
+
+ port0 = inb_p(base_addr); /* For REV A boards */
+ port1 = inb_p(base_addr + 1); /* For REV C boards */
+ if (port0 != 0xff || port1 != 0xff) {
+ /* Not an 'ff' from a floating bus, so must be a card! */
+ for (i = 0; i < 4; ++i) {
+
+ msleep(500);
+
+ last_port0 = port0;
+ last_port1 = port1;
+
+ port0 = inb_p(base_addr);
+ port1 = inb_p(base_addr + 1);
+
+ /* Has either hearbeat bit changed? */
+ if ((port0 ^ last_port0) & WD_HRTBT ||
+ (port1 ^ last_port1) & WD_REVC_HRBT) {
+ retval = 1;
+ break;
+ }
+ }
+ }
+ release_region(base_addr, 4);
+
+ return retval;
+}
+
+static int pcwd_isa_probe(struct device *dev, unsigned int id)
+{
+ int ret;
+
+ if (debug >= DEBUG)
+ pr_debug("pcwd_isa_probe id=%d\n", id);
+
+ cards_found++;
+ if (cards_found == 1)
+ pr_info("v%s Ken Hollis (kenji@bitgate.com)\n",
+ WATCHDOG_VERSION);
+
+ if (cards_found > 1) {
+ pr_err("This driver only supports 1 device\n");
+ return -ENODEV;
+ }
+
+ if (pcwd_ioports[id] == 0x0000) {
+ pr_err("No I/O-Address for card detected\n");
+ return -ENODEV;
+ }
+ pcwd_private.io_addr = pcwd_ioports[id];
+
+ spin_lock_init(&pcwd_private.io_lock);
+
+ /* Check card's revision */
+ pcwd_private.revision = get_revision();
+
+ if (!request_region(pcwd_private.io_addr,
+ (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
+ pr_err("I/O address 0x%04x already in use\n",
+ pcwd_private.io_addr);
+ ret = -EIO;
+ goto error_request_region;
+ }
+
+ /* Initial variables */
+ pcwd_private.supports_temp = 0;
+ temp_panic = 0;
+ pcwd_private.boot_status = 0x0000;
+
+ /* get the boot_status */
+ pcwd_get_status(&pcwd_private.boot_status);
+
+ /* clear the "card caused reboot" flag */
+ pcwd_clear_status();
+
+ setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0);
+
+ /* Disable the board */
+ pcwd_stop();
+
+ /* Check whether or not the card supports the temperature device */
+ pcwd_check_temperature_support();
+
+ /* Show info about the card itself */
+ pcwd_show_card_info();
+
+ /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
+ if (heartbeat == 0)
+ heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)];
+
+ /* Check that the heartbeat value is within it's range;
+ if not reset to the default */
+ if (pcwd_set_heartbeat(heartbeat)) {
+ pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
+ pr_info("heartbeat value must be 2 <= heartbeat <= 7200, using %d\n",
+ WATCHDOG_HEARTBEAT);
+ }
+
+ if (pcwd_private.supports_temp) {
+ ret = misc_register(&temp_miscdev);
+ if (ret) {
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ TEMP_MINOR, ret);
+ goto error_misc_register_temp;
+ }
+ }
+
+ ret = misc_register(&pcwd_miscdev);
+ if (ret) {
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
+ goto error_misc_register_watchdog;
+ }
+
+ pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
+ heartbeat, nowayout);
+
+ return 0;
+
+error_misc_register_watchdog:
+ if (pcwd_private.supports_temp)
+ misc_deregister(&temp_miscdev);
+error_misc_register_temp:
+ release_region(pcwd_private.io_addr,
+ (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+error_request_region:
+ pcwd_private.io_addr = 0x0000;
+ cards_found--;
+ return ret;
+}
+
+static int pcwd_isa_remove(struct device *dev, unsigned int id)
+{
+ if (debug >= DEBUG)
+ pr_debug("pcwd_isa_remove id=%d\n", id);
+
+ if (!pcwd_private.io_addr)
+ return 1;
+
+ /* Disable the board */
+ if (!nowayout)
+ pcwd_stop();
+
+ /* Deregister */
+ misc_deregister(&pcwd_miscdev);
+ if (pcwd_private.supports_temp)
+ misc_deregister(&temp_miscdev);
+ release_region(pcwd_private.io_addr,
+ (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+ pcwd_private.io_addr = 0x0000;
+ cards_found--;
+
+ return 0;
+}
+
+static void pcwd_isa_shutdown(struct device *dev, unsigned int id)
+{
+ if (debug >= DEBUG)
+ pr_debug("pcwd_isa_shutdown id=%d\n", id);
+
+ pcwd_stop();
+}
+
+static struct isa_driver pcwd_isa_driver = {
+ .match = pcwd_isa_match,
+ .probe = pcwd_isa_probe,
+ .remove = pcwd_isa_remove,
+ .shutdown = pcwd_isa_shutdown,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = WATCHDOG_NAME,
+ },
+};
+
+static int __init pcwd_init_module(void)
+{
+ return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS);
+}
+
+static void __exit pcwd_cleanup_module(void)
+{
+ isa_unregister_driver(&pcwd_isa_driver);
+ pr_info("Watchdog Module Unloaded\n");
+}
+
+module_init(pcwd_init_module);
+module_exit(pcwd_cleanup_module);
+
+MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, "
+ "Wim Van Sebroeck <wim@iguana.be>");
+MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
+MODULE_VERSION(WATCHDOG_VERSION);
+MODULE_LICENSE("GPL");