diff options
Diffstat (limited to 'drivers/watchdog/i6300esb.c')
| -rw-r--r-- | drivers/watchdog/i6300esb.c | 101 |
1 files changed, 64 insertions, 37 deletions
diff --git a/drivers/watchdog/i6300esb.c b/drivers/watchdog/i6300esb.c index 74f951c..2dbe835 100644 --- a/drivers/watchdog/i6300esb.c +++ b/drivers/watchdog/i6300esb.c @@ -13,7 +13,7 @@ * * The timer is implemented in the following I/O controller hubs: * (See the intel documentation on http://developer.intel.com.) - * 6300ESB chip : document number 300641-003 + * 6300ESB chip : document number 300641-004 * * 2004YYZZ Ross Biro * Initial version 0.01 @@ -34,7 +34,7 @@ #include <linux/mm.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> -#include <linux/reboot.h> +#include <linux/platform_device.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/ioport.h> @@ -42,7 +42,7 @@ #include <linux/io.h> /* Module and version information */ -#define ESB_VERSION "0.03" +#define ESB_VERSION "0.04" #define ESB_MODULE_NAME "i6300ESB timer" #define ESB_DRIVER_NAME ESB_MODULE_NAME ", v" ESB_VERSION #define PFX ESB_MODULE_NAME ": " @@ -81,6 +81,7 @@ static unsigned long timer_alive; static struct pci_dev *esb_pci; static unsigned short triggered; /* The status of the watchdog upon boot */ static char esb_expect_close; +static struct platform_device *esb_platform_device; /* module parameters */ /* 30 sec default heartbeat (1 < heartbeat < 2*1023) */ @@ -114,13 +115,18 @@ static inline void esb_unlock_registers(void) writeb(ESB_UNLOCK2, ESB_RELOAD_REG); } -static void esb_timer_start(void) +static int esb_timer_start(void) { u8 val; + spin_lock(&esb_lock); + esb_unlock_registers(); + writew(ESB_WDT_RELOAD, ESB_RELOAD_REG); /* Enable or Enable + Lock? */ val = 0x02 | (nowayout ? 0x01 : 0x00); pci_write_config_byte(esb_pci, ESB_LOCK_REG, val); + spin_unlock(&esb_lock); + return 0; } static int esb_timer_stop(void) @@ -207,7 +213,6 @@ static int esb_open(struct inode *inode, struct file *file) return -EBUSY; /* Reload and activate timer */ - esb_timer_keepalive(); esb_timer_start(); return nonseekable_open(inode, file); @@ -240,7 +245,8 @@ static ssize_t esb_write(struct file *file, const char __user *data, * five months ago... */ esb_expect_close = 0; - /* scan to see whether or not we got the magic character */ + /* scan to see whether or not we got the + * magic character */ for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) @@ -292,7 +298,6 @@ static long esb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) } if (new_options & WDIOS_ENABLECARD) { - esb_timer_keepalive(); esb_timer_start(); retval = 0; } @@ -319,19 +324,6 @@ static long esb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) } /* - * Notify system - */ - -static int esb_notify_sys(struct notifier_block *this, - unsigned long code, void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - esb_timer_stop(); /* Turn the WDT off */ - - return NOTIFY_DONE; -} - -/* * Kernel Interfaces */ @@ -350,10 +342,6 @@ static struct miscdevice esb_miscdev = { .fops = &esb_fops, }; -static struct notifier_block esb_notifier = { - .notifier_call = esb_notify_sys, -}; - /* * Data for PCI driver interface * @@ -372,7 +360,7 @@ MODULE_DEVICE_TABLE(pci, esb_pci_tbl); * Init & exit routines */ -static unsigned char __init esb_getdevice(void) +static unsigned char __devinit esb_getdevice(void) { u8 val1; unsigned short val2; @@ -443,7 +431,7 @@ err_devput: return 0; } -static int __init watchdog_init(void) +static int __devinit esb_probe(struct platform_device *dev) { int ret; @@ -459,19 +447,13 @@ static int __init watchdog_init(void) "heartbeat value must be 1<heartbeat<2046, using %d\n", heartbeat); } - ret = register_reboot_notifier(&esb_notifier); - if (ret != 0) { - printk(KERN_ERR PFX - "cannot register reboot notifier (err=%d)\n", ret); - goto err_unmap; - } ret = misc_register(&esb_miscdev); if (ret != 0) { printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); - goto err_notifier; + goto err_unmap; } esb_timer_stop(); printk(KERN_INFO PFX @@ -479,8 +461,6 @@ static int __init watchdog_init(void) BASEADDR, heartbeat, nowayout); return 0; -err_notifier: - unregister_reboot_notifier(&esb_notifier); err_unmap: iounmap(BASEADDR); /* err_release: */ @@ -492,7 +472,7 @@ err_unmap: return ret; } -static void __exit watchdog_cleanup(void) +static int __devexit esb_remove(struct platform_device *dev) { /* Stop the timer before we leave */ if (!nowayout) @@ -500,11 +480,58 @@ static void __exit watchdog_cleanup(void) /* Deregister */ misc_deregister(&esb_miscdev); - unregister_reboot_notifier(&esb_notifier); iounmap(BASEADDR); pci_release_region(esb_pci, 0); pci_disable_device(esb_pci); pci_dev_put(esb_pci); + return 0; +} + +static void esb_shutdown(struct platform_device *dev) +{ + esb_timer_stop(); +} + +static struct platform_driver esb_platform_driver = { + .probe = esb_probe, + .remove = __devexit_p(esb_remove), + .shutdown = esb_shutdown, + .driver = { + .owner = THIS_MODULE, + .name = ESB_MODULE_NAME, + }, +}; + +static int __init watchdog_init(void) +{ + int err; + + printk(KERN_INFO PFX "Intel 6300ESB WatchDog Timer Driver v%s\n", + ESB_VERSION); + + err = platform_driver_register(&esb_platform_driver); + if (err) + return err; + + esb_platform_device = platform_device_register_simple(ESB_MODULE_NAME, + -1, NULL, 0); + if (IS_ERR(esb_platform_device)) { + err = PTR_ERR(esb_platform_device); + goto unreg_platform_driver; + } + + return 0; + +unreg_platform_driver: + platform_driver_unregister(&esb_platform_driver); + return err; +} + +static void __exit watchdog_cleanup(void) +{ + platform_device_unregister(esb_platform_device); + platform_driver_unregister(&esb_platform_driver); + printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); } module_init(watchdog_init); |
