diff options
| -rw-r--r-- | drivers/char/watchdog/pcwd.c | 242 |
1 files changed, 120 insertions, 122 deletions
diff --git a/drivers/char/watchdog/pcwd.c b/drivers/char/watchdog/pcwd.c index 6e8b5705b5b7..7b41434fac8c 100644 --- a/drivers/char/watchdog/pcwd.c +++ b/drivers/char/watchdog/pcwd.c @@ -59,10 +59,10 @@ #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/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/... */ @@ -70,8 +70,8 @@ #include <asm/io.h> /* For inb/outb/... */ /* Module and version information */ -#define WATCHDOG_VERSION "1.18" -#define WATCHDOG_DATE "21 Jan 2007" +#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 ": " @@ -89,6 +89,15 @@ #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. */ @@ -485,7 +494,7 @@ static int pcwd_get_status(int *status) if (control_status & WD_T110) { *status |= WDIOF_OVERHEAT; if (temp_panic) { - printk (KERN_INFO PFX "Temperature overheat trip!\n"); + printk(KERN_INFO PFX "Temperature overheat trip!\n"); kernel_power_off(); /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ } @@ -497,7 +506,7 @@ static int pcwd_get_status(int *status) if (control_status & WD_REVC_TTRP) { *status |= WDIOF_OVERHEAT; if (temp_panic) { - printk (KERN_INFO PFX "Temperature overheat trip!\n"); + printk(KERN_INFO PFX "Temperature overheat trip!\n"); kernel_power_off(); /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ } @@ -734,20 +743,6 @@ static int pcwd_temp_close(struct inode *inode, struct file *file) } /* - * 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 */ @@ -780,10 +775,6 @@ static struct miscdevice temp_miscdev = { .fops = &pcwd_temp_fops, }; -static struct notifier_block pcwd_notifier = { - .notifier_call = pcwd_notify_sys, -}; - /* * Init & exit routines */ @@ -803,10 +794,67 @@ static inline int get_revision(void) return r; } -static int __devinit pcwatchdog_init(int base_addr) +/* + * 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); @@ -816,11 +864,13 @@ static int __devinit pcwatchdog_init(int base_addr) return -ENODEV; } - if (base_addr == 0x0000) { + if (pcwd_ioports[id] == 0x0000) { printk(KERN_ERR PFX "No I/O-Address for card detected\n"); return -ENODEV; } - pcwd_private.io_addr = base_addr; + pcwd_private.io_addr = pcwd_ioports[id]; + + spin_lock_init(&pcwd_private.io_lock); /* Check card's revision */ pcwd_private.revision = get_revision(); @@ -828,8 +878,8 @@ static int __devinit pcwatchdog_init(int base_addr) 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; + ret=-EIO; + goto error_request_region; } /* Initial variables */ @@ -865,24 +915,12 @@ static int __devinit pcwatchdog_init(int base_addr) 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; + goto error_misc_register_temp; } } @@ -890,22 +928,34 @@ static int __devinit pcwatchdog_init(int base_addr) 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; + 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 void __devexit pcwatchdog_exit(void) +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(); @@ -914,102 +964,50 @@ static void __devexit pcwatchdog_exit(void) 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--; + + return 0; } -/* - * 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) +static void pcwd_isa_shutdown(struct device *dev, unsigned int 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 (!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); + if (debug >= DEBUG) + printk(KERN_DEBUG PFX "pcwd_isa_shutdown id=%d\n", + id); - return retval; + pcwd_stop(); } -/* - * 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 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) { - 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; + return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS); } static void __exit pcwd_cleanup_module(void) { - if (pcwd_private.io_addr) - pcwatchdog_exit(); - + 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>"); +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); |
