+++ /dev/null
-/*
- * 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/
- */
-
-#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 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
-#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 <asm/uaccess.h> /* For copy_to_user/put_user/... */
-#include <asm/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 PFX WATCHDOG_NAME ": "
-#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
-#define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")"
-
-/*
- * 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 atomic_t open_allowed = ATOMIC_INIT(1);
-static char expect_close;
-static int temp_panic;
-static struct { /* this is private data for each ISA-PC watchdog card */
- char fw_ver_str[6]; /* The cards firmware version */
- int revision; /* The card's revision */
- int supports_temp; /* Wether or not the card has a temperature device */
- int command_mode; /* Wether 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)");
-
-#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */
-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 int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 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)
- printk(KERN_DEBUG PFX "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)
- printk(KERN_DEBUG PFX "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)
- printk(KERN_DEBUG PFX "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)
- printk(KERN_DEBUG PFX "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)
- printk(KERN_INFO PFX "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();
- printk(KERN_INFO PFX "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();
- printk(KERN_INFO PFX "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)
- printk(KERN_INFO PFX "Temperature Option Detected\n");
-
- if (pcwd_private.boot_status & WDIOF_CARDRESET)
- printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
-
- if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
- printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n");
- printk(KERN_EMERG PFX "CPU Overheat\n");
- }
-
- if (pcwd_private.boot_status == 0)
- printk(KERN_INFO PFX "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 {
- printk(KERN_WARNING PFX "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) {
- printk(KERN_INFO PFX "Could not start watchdog\n");
- return -EIO;
- }
- }
-
- if (debug >= VERBOSE)
- printk(KERN_DEBUG PFX "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) {
- printk(KERN_INFO PFX "Could not stop watchdog\n");
- return -EIO;
- }
- }
-
- if (debug >= VERBOSE)
- printk(KERN_DEBUG PFX "Watchdog stopped\n");
-
- return 0;
-}
-
-static int pcwd_keepalive(void)
-{
- /* user land ping */
- pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
-
- if (debug >= DEBUG)
- printk(KERN_DEBUG PFX "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)
- printk(KERN_DEBUG PFX "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) {
- printk(KERN_INFO PFX "Temperature overheat trip!\n");
- kernel_power_off();
- /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
- }
- }
- } else {
- if (control_status & WD_REVC_WTRP)
- *status |= WDIOF_CARDRESET;
-
- if (control_status & WD_REVC_TTRP) {
- *status |= WDIOF_OVERHEAT;
- if (temp_panic) {
- printk(KERN_INFO PFX "Temperature overheat trip!\n");
- kernel_power_off();
- /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
- }
- }
- }
-
- 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)
- printk(KERN_INFO PFX "clearing watchdog trip status\n");
-
- control_status = inb_p(pcwd_private.io_addr + 1);
-
- if (debug >= DEBUG) {
- printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
- printk(KERN_DEBUG PFX "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) {
- printk(KERN_DEBUG PFX "temperature is: %d F\n",
- *temperature);
- }
-
- return 0;
-}
-
-/*
- * /dev/watchdog handling
- */
-
-static int pcwd_ioctl(struct inode *inode, 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 struct watchdog_info ident = {
- .options = WDIOF_OVERHEAT |
- WDIOF_CARDRESET |
- WDIOF_KEEPALIVEPING |
- WDIOF_SETTIMEOUT |
- WDIOF_MAGICCLOSE,
- .firmware_version = 1,
- .identity = "PCWD",
- };
-
- switch(cmd) {
- default:
- return -ENOTTY;
-
- 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(copy_from_user(&rv, argp, sizeof(int)))
- return -EFAULT;
-
- if (rv & WDIOS_DISABLECARD)
- {
- return pcwd_stop();
- }
-
- if (rv & WDIOS_ENABLECARD)
- {
- return pcwd_start();
- }
-
- 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);
- }
-
- 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 (!atomic_dec_and_test(&open_allowed) ) {
- if (debug >= VERBOSE)
- printk(KERN_ERR PFX "Attempt to open already opened device.\n");
- atomic_inc( &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 {
- printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
- pcwd_keepalive();
- }
- expect_close = 0;
- atomic_inc( &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,
- .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 __devinit 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)
- printk(KERN_DEBUG PFX "pcwd_isa_match id=%d\n",
- id);
-
- if (!request_region (base_addr, 4, "PCWD")) {
- printk(KERN_INFO PFX "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 __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
-{
- int ret;
-
- if (debug >= DEBUG)
- printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d\n",
- id);
-
- cards_found++;
- if (cards_found == 1)
- printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER);
-
- if (cards_found > 1) {
- printk(KERN_ERR PFX "This driver only supports 1 device\n");
- return -ENODEV;
- }
-
- if (pcwd_ioports[id] == 0x0000) {
- printk(KERN_ERR PFX "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")) {
- printk(KERN_ERR PFX "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);
- printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n",
- WATCHDOG_HEARTBEAT);
- }
-
- if (pcwd_private.supports_temp) {
- ret = misc_register(&temp_miscdev);
- if (ret) {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- TEMP_MINOR, ret);
- goto error_misc_register_temp;
- }
- }
-
- ret = misc_register(&pcwd_miscdev);
- if (ret) {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto error_misc_register_watchdog;
- }
-
- printk(KERN_INFO PFX "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 __devexit pcwd_isa_remove(struct device *dev, unsigned int id)
-{
- if (debug >= DEBUG)
- printk(KERN_DEBUG PFX "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)
- printk(KERN_DEBUG PFX "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 = __devexit_p(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);
- printk(KERN_INFO PFX "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");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
-MODULE_ALIAS_MISCDEV(TEMP_MINOR);
git.openpandora.org / pandora-kernel.git / blobdiff