diff options
author | Guenter Roeck <linux@roeck-us.net> | 2017-06-11 06:04:33 +0200 |
---|---|---|
committer | Wim Van Sebroeck <wim@iguana.be> | 2017-07-03 10:58:47 +0200 |
commit | 1d7b80394c48a56c705733cb6c044199ffbf1dfd (patch) | |
tree | 463b04301626879d2d25eec73f67893d29d90528 /drivers/watchdog/it87_wdt.c | |
parent | watchdog: it87: Drop FSF mailing address (diff) | |
download | linux-1d7b80394c48a56c705733cb6c044199ffbf1dfd.tar.xz linux-1d7b80394c48a56c705733cb6c044199ffbf1dfd.zip |
watchdog: it87: Convert to use watchdog core infrastructure
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/it87_wdt.c')
-rw-r--r-- | drivers/watchdog/it87_wdt.c | 375 |
1 files changed, 71 insertions, 304 deletions
diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c index 8c847f8c2470..9a6523e70ffc 100644 --- a/drivers/watchdog/it87_wdt.c +++ b/drivers/watchdog/it87_wdt.c @@ -32,26 +32,18 @@ #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/watchdog.h> #include <linux/notifier.h> #include <linux/reboot.h> -#include <linux/uaccess.h> #include <linux/io.h> - -#define WATCHDOG_VERSION "1.14" #define WATCHDOG_NAME "IT87 WDT" -#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" -#define WD_MAGIC 'V' /* Defaults for Module Parameter */ #define DEFAULT_NOGAMEPORT 0 #define DEFAULT_NOCIR 0 -#define DEFAULT_EXCLUSIVE 1 #define DEFAULT_TIMEOUT 60 #define DEFAULT_TESTMODE 0 #define DEFAULT_NOWAYOUT WATCHDOG_NOWAYOUT @@ -129,23 +121,17 @@ #define GP_BASE_DEFAULT 0x0201 /* wdt_status */ -#define WDTS_TIMER_RUN 0 -#define WDTS_DEV_OPEN 1 -#define WDTS_KEEPALIVE 2 -#define WDTS_LOCKED 3 -#define WDTS_USE_GP 4 -#define WDTS_EXPECTED 5 -#define WDTS_USE_CIR 6 - -static unsigned int base, gpact, ciract, max_units, chip_type; -static unsigned long wdt_status; - -static int nogameport = DEFAULT_NOGAMEPORT; -static int nocir = DEFAULT_NOCIR; -static int exclusive = DEFAULT_EXCLUSIVE; -static int timeout = DEFAULT_TIMEOUT; -static int testmode = DEFAULT_TESTMODE; -static bool nowayout = DEFAULT_NOWAYOUT; +#define WDTS_USE_GP 0 +#define WDTS_USE_CIR 1 + +static unsigned int base, gpact, ciract, max_units, chip_type; +static unsigned long wdt_status; + +static int nogameport = DEFAULT_NOGAMEPORT; +static int nocir = DEFAULT_NOCIR; +static unsigned int timeout = DEFAULT_TIMEOUT; +static int testmode = DEFAULT_TESTMODE; +static bool nowayout = DEFAULT_NOWAYOUT; module_param(nogameport, int, 0); MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default=" @@ -153,9 +139,6 @@ MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default=" module_param(nocir, int, 0); MODULE_PARM_DESC(nocir, "Forbid the use of Consumer IR interrupts to reset timer, default=" __MODULE_STRING(DEFAULT_NOCIR)); -module_param(exclusive, int, 0); -MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default=" - __MODULE_STRING(DEFAULT_EXCLUSIVE)); module_param(timeout, int, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default=" __MODULE_STRING(DEFAULT_TIMEOUT)); @@ -227,7 +210,7 @@ static inline void superio_outw(int val, int reg) } /* Internal function, should be called after superio_select(GPIO) */ -static void wdt_update_timeout(void) +static void _wdt_update_timeout(void) { unsigned char cfg = WDT_KRST; int tm = timeout; @@ -249,6 +232,21 @@ static void wdt_update_timeout(void) superio_outb(tm>>8, WDTVALMSB); } +static int wdt_update_timeout(void) +{ + int ret; + + ret = superio_enter(); + if (ret) + return ret; + + superio_select(GPIO); + _wdt_update_timeout(); + superio_exit(); + + return 0; +} + static int wdt_round_time(int t) { t += 59; @@ -258,25 +256,22 @@ static int wdt_round_time(int t) /* watchdog timer handling */ -static void wdt_keepalive(void) +static int wdt_keepalive(struct watchdog_device *wdd) { + int ret = 0; + if (test_bit(WDTS_USE_GP, &wdt_status)) inb(base); else if (test_bit(WDTS_USE_CIR, &wdt_status)) /* The timer reloads with around 5 msec delay */ outb(0x55, CIR_DR(base)); - else { - if (superio_enter()) - return; + else + ret = wdt_update_timeout(); - superio_select(GPIO); - wdt_update_timeout(); - superio_exit(); - } - set_bit(WDTS_KEEPALIVE, &wdt_status); + return ret; } -static int wdt_start(void) +static int wdt_start(struct watchdog_device *wdd) { int ret = superio_enter(); if (ret) @@ -287,14 +282,15 @@ static int wdt_start(void) superio_outb(WDT_GAMEPORT, WDTCTRL); else if (test_bit(WDTS_USE_CIR, &wdt_status)) superio_outb(WDT_CIRINT, WDTCTRL); - wdt_update_timeout(); + + _wdt_update_timeout(); superio_exit(); return 0; } -static int wdt_stop(void) +static int wdt_stop(struct watchdog_device *wdd) { int ret = superio_enter(); if (ret) @@ -321,280 +317,49 @@ static int wdt_stop(void) * Used within WDIOC_SETTIMEOUT watchdog device ioctl. */ -static int wdt_set_timeout(int t) +static int wdt_set_timeout(struct watchdog_device *wdd, unsigned int t) { - if (t < 1 || t > max_units * 60) - return -EINVAL; + int ret = 0; if (t > max_units) - timeout = wdt_round_time(t); - else - timeout = t; - - if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { - int ret = superio_enter(); - if (ret) - return ret; - - superio_select(GPIO); - wdt_update_timeout(); - superio_exit(); - } - return 0; -} - -/** - * wdt_get_status - determines the status supported by watchdog ioctl - * @status: status returned to user space - * - * The status bit of the device does not allow to distinguish - * between a regular system reset and a watchdog forced reset. - * But, in test mode it is useful, so it is supported through - * WDIOC_GETSTATUS watchdog ioctl. Additionally the driver - * reports the keepalive signal and the acception of the magic. - * - * Used within WDIOC_GETSTATUS watchdog device ioctl. - */ - -static int wdt_get_status(int *status) -{ - *status = 0; - if (testmode) { - int ret = superio_enter(); - if (ret) - return ret; - - superio_select(GPIO); - if (superio_inb(WDTCTRL) & WDT_ZERO) { - superio_outb(0x00, WDTCTRL); - clear_bit(WDTS_TIMER_RUN, &wdt_status); - *status |= WDIOF_CARDRESET; - } - - superio_exit(); - } - if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status)) - *status |= WDIOF_KEEPALIVEPING; - if (test_bit(WDTS_EXPECTED, &wdt_status)) - *status |= WDIOF_MAGICCLOSE; - return 0; -} - -/* /dev/watchdog handling */ - -/** - * wdt_open - watchdog file_operations .open - * @inode: inode of the device - * @file: file handle to the device - * - * The watchdog timer starts by opening the device. - * - * Used within the file operation of the watchdog device. - */ - -static int wdt_open(struct inode *inode, struct file *file) -{ - if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status)) - return -EBUSY; - if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) { - int ret; - if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status)) - __module_get(THIS_MODULE); - - ret = wdt_start(); - if (ret) { - clear_bit(WDTS_LOCKED, &wdt_status); - clear_bit(WDTS_TIMER_RUN, &wdt_status); - clear_bit(WDTS_DEV_OPEN, &wdt_status); - return ret; - } - } - return nonseekable_open(inode, file); -} + t = wdt_round_time(t); -/** - * wdt_release - watchdog file_operations .release - * @inode: inode of the device - * @file: file handle to the device - * - * Closing the watchdog device either stops the watchdog timer - * or in the case, that nowayout is set or the magic character - * wasn't written, a critical warning about an running watchdog - * timer is given. - * - * Used within the file operation of the watchdog device. - */ + wdd->timeout = t; -static int wdt_release(struct inode *inode, struct file *file) -{ - if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { - if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) { - int ret = wdt_stop(); - if (ret) { - /* - * Stop failed. Just keep the watchdog alive - * and hope nothing bad happens. - */ - set_bit(WDTS_EXPECTED, &wdt_status); - wdt_keepalive(); - return ret; - } - clear_bit(WDTS_TIMER_RUN, &wdt_status); - } else { - wdt_keepalive(); - pr_crit("unexpected close, not stopping watchdog!\n"); - } - } - clear_bit(WDTS_DEV_OPEN, &wdt_status); - return 0; -} - -/** - * wdt_write - watchdog file_operations .write - * @file: file handle to the watchdog - * @buf: buffer to write - * @count: count of bytes - * @ppos: pointer to the position to write. No seeks allowed - * - * A write to a watchdog device is defined as a keepalive signal. Any - * write of data will do, as we don't define content meaning. - * - * Used within the file operation of the watchdog device. - */ + if (watchdog_hw_running(wdd)) + ret = wdt_update_timeout(); -static ssize_t wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (count) { - clear_bit(WDTS_EXPECTED, &wdt_status); - wdt_keepalive(); - } - if (!nowayout) { - size_t ofs; - - /* note: just in case someone wrote the magic character long ago */ - for (ofs = 0; ofs != count; ofs++) { - char c; - if (get_user(c, buf + ofs)) - return -EFAULT; - if (c == WD_MAGIC) - set_bit(WDTS_EXPECTED, &wdt_status); - } - } - return count; + return ret; } static const struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, - .firmware_version = 1, + .firmware_version = 1, .identity = WATCHDOG_NAME, }; -/** - * wdt_ioctl - watchdog file_operations .unlocked_ioctl - * @file: file handle to the device - * @cmd: watchdog command - * @arg: argument pointer - * - * The watchdog API defines a common set of functions for all watchdogs - * according to their available features. - * - * Used within the file operation of the watchdog device. - */ - -static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - int rc = 0, status, new_options, new_timeout; - union { - struct watchdog_info __user *ident; - int __user *i; - } uarg; - - uarg.i = (int __user *)arg; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(uarg.ident, - &ident, sizeof(ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - rc = wdt_get_status(&status); - if (rc) - return rc; - return put_user(status, uarg.i); - - case WDIOC_GETBOOTSTATUS: - return put_user(0, uarg.i); - - case WDIOC_KEEPALIVE: - wdt_keepalive(); - return 0; - - case WDIOC_SETOPTIONS: - if (get_user(new_options, uarg.i)) - return -EFAULT; - - switch (new_options) { - case WDIOS_DISABLECARD: - if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { - rc = wdt_stop(); - if (rc) - return rc; - } - clear_bit(WDTS_TIMER_RUN, &wdt_status); - return 0; - - case WDIOS_ENABLECARD: - if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) { - rc = wdt_start(); - if (rc) { - clear_bit(WDTS_TIMER_RUN, &wdt_status); - return rc; - } - } - return 0; - - default: - return -EFAULT; - } - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, uarg.i)) - return -EFAULT; - rc = wdt_set_timeout(new_timeout); - case WDIOC_GETTIMEOUT: - if (put_user(timeout, uarg.i)) - return -EFAULT; - return rc; +static struct watchdog_ops wdt_ops = { + .owner = THIS_MODULE, + .start = wdt_start, + .stop = wdt_stop, + .ping = wdt_keepalive, + .set_timeout = wdt_set_timeout, +}; - default: - return -ENOTTY; - } -} +static struct watchdog_device wdt_dev = { + .info = &ident, + .ops = &wdt_ops, + .min_timeout = 1, +}; static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) + void *unused) { if (code == SYS_DOWN || code == SYS_HALT) - wdt_stop(); + wdt_stop(&wdt_dev); return NOTIFY_DONE; } -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .unlocked_ioctl = wdt_ioctl, - .open = wdt_open, - .release = wdt_release, -}; - -static struct miscdevice wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt_fops, -}; - static struct notifier_block wdt_notifier = { .notifier_call = wdt_notify_sys, }; @@ -708,19 +473,15 @@ static int __init it87_wdt_init(void) if (timeout > max_units) timeout = wdt_round_time(timeout); + wdt_dev.timeout = timeout; + wdt_dev.max_timeout = max_units * 60; + rc = register_reboot_notifier(&wdt_notifier); if (rc) { pr_err("Cannot register reboot notifier (err=%d)\n", rc); goto err_out_region; } - rc = misc_register(&wdt_miscdev); - if (rc) { - pr_err("Cannot register miscdev on minor=%d (err=%d)\n", - wdt_miscdev.minor, rc); - goto err_out_reboot; - } - /* Initialize CIR to use it as keepalive source */ if (test_bit(WDTS_USE_CIR, &wdt_status)) { outb(0x00, CIR_RCR(base)); @@ -732,9 +493,15 @@ static int __init it87_wdt_init(void) outb(0x09, CIR_IER(base)); } - pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d exclusive=%d nogameport=%d nocir=%d)\n", + rc = watchdog_register_device(&wdt_dev); + if (rc) { + pr_err("Cannot register watchdog device (err=%d)\n", rc); + goto err_out_reboot; + } + + pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d nogameport=%d nocir=%d)\n", chip_type, chip_rev, timeout, - nowayout, testmode, exclusive, nogameport, nocir); + nowayout, testmode, nogameport, nocir); superio_exit(); return 0; @@ -778,7 +545,7 @@ static void __exit it87_wdt_exit(void) superio_exit(); } - misc_deregister(&wdt_miscdev); + watchdog_unregister_device(&wdt_dev); unregister_reboot_notifier(&wdt_notifier); if (test_bit(WDTS_USE_GP, &wdt_status)) |