| /* |
| * 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/notifier.h> /* For notifier support */ |
| #include <linux/reboot.h> /* For reboot_notifier stuff */ |
| #include <linux/init.h> /* For __init/__exit/... */ |
| #include <linux/fs.h> /* For file operations */ |
| #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 "1.17" |
| #define WATCHDOG_DATE "12 Feb 2006" |
| #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 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 |
| |
| /* |
| * 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 60 /* 60 sec default heartbeat */ |
| static int heartbeat = WATCHDOG_HEARTBEAT; |
| module_param(heartbeat, int, 0); |
| MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, 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=CONFIG_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; |
| } |
| |
| /* |
| * Notify system |
| */ |
| |
| static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) |
| { |
| if (code==SYS_DOWN || code==SYS_HALT) { |
| /* Turn the WDT off */ |
| pcwd_stop(); |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| /* |
| * 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, |
| }; |
| |
| static struct notifier_block pcwd_notifier = { |
| .notifier_call = pcwd_notify_sys, |
| }; |
| |
| /* |
| * 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; |
| } |
| |
| static int __devinit pcwatchdog_init(int base_addr) |
| { |
| int ret; |
| |
| 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 (base_addr == 0x0000) { |
| printk(KERN_ERR PFX "No I/O-Address for card detected\n"); |
| return -ENODEV; |
| } |
| pcwd_private.io_addr = base_addr; |
| |
| /* 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); |
| pcwd_private.io_addr = 0x0000; |
| return -EIO; |
| } |
| |
| /* 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(); |
| |
| init_timer(&pcwd_private.timer); |
| pcwd_private.timer.function = pcwd_timer_ping; |
| pcwd_private.timer.data = 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(); |
| |
| /* 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); |
| } |
| |
| ret = register_reboot_notifier(&pcwd_notifier); |
| if (ret) { |
| printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", |
| ret); |
| release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| pcwd_private.io_addr = 0x0000; |
| return ret; |
| } |
| |
| 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); |
| unregister_reboot_notifier(&pcwd_notifier); |
| release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| pcwd_private.io_addr = 0x0000; |
| return ret; |
| } |
| } |
| |
| ret = misc_register(&pcwd_miscdev); |
| if (ret) { |
| printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
| WATCHDOG_MINOR, ret); |
| if (pcwd_private.supports_temp) |
| misc_deregister(&temp_miscdev); |
| unregister_reboot_notifier(&pcwd_notifier); |
| release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| pcwd_private.io_addr = 0x0000; |
| return ret; |
| } |
| |
| printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", |
| heartbeat, nowayout); |
| |
| return 0; |
| } |
| |
| static void __devexit pcwatchdog_exit(void) |
| { |
| /* Disable the board */ |
| if (!nowayout) |
| pcwd_stop(); |
| |
| /* Deregister */ |
| misc_deregister(&pcwd_miscdev); |
| if (pcwd_private.supports_temp) |
| misc_deregister(&temp_miscdev); |
| unregister_reboot_notifier(&pcwd_notifier); |
| release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| pcwd_private.io_addr = 0x0000; |
| cards_found--; |
| } |
| |
| /* |
| * 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 __init pcwd_checkcard(int base_addr) |
| { |
| 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 (!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; |
| } |
| |
| /* |
| * 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. |
| */ |
| static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; |
| |
| static int __init pcwd_init_module(void) |
| { |
| int i, found = 0; |
| |
| spin_lock_init(&pcwd_private.io_lock); |
| |
| for (i = 0; pcwd_ioports[i] != 0; i++) { |
| if (pcwd_checkcard(pcwd_ioports[i])) { |
| if (!(pcwatchdog_init(pcwd_ioports[i]))) |
| found++; |
| } |
| } |
| |
| if (!found) { |
| printk (KERN_INFO PFX "No card detected, or port not available\n"); |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| static void __exit pcwd_cleanup_module(void) |
| { |
| if (pcwd_private.io_addr) |
| pcwatchdog_exit(); |
| |
| 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>"); |
| MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
| MODULE_ALIAS_MISCDEV(TEMP_MINOR); |