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[WATCHDOG] w83697hf/hg WDT driver - patch 10

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This is patch 10 in the series of patches that converts
Marcus Junker's w83697hf watchdog driver to Samuel Tardieau's
w83697hf/hg watchdog driver.

This patch contains following changes:
 - check whether the device is really present
   (we *can* probe for the device now).

Signed-off-by: Samuel Tardieu <sam@rfc1149.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Samuel Tardieu 2006-09-07 11:57:00 +02:00 committed by Wim Van Sebroeck
parent 0cd544763b
commit c81b299625
1 changed files with 44 additions and 10 deletions
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54
drivers/char/watchdog/w83697hf_wdt.c
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@ -49,9 +49,9 @@ static char expect_close;
static spinlock_t io_lock;
/* You must set this - there is no sane way to probe for this board. */
static int wdt_io = 0x2E;
static int wdt_io = 0x2e;
module_param(wdt_io, int, 0);
MODULE_PARM_DESC(wdt_io, "w83697hf WDT io port (default 0x2E)");
MODULE_PARM_DESC(wdt_io, "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
module_param(timeout, int, 0);
@ -331,28 +331,62 @@ static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};
static int
w83697hf_check_wdt(void)
{
if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%x already in use\n", wdt_io);
return -EIO;
}
printk (KERN_DEBUG PFX "Looking for watchdog at address 0x%x\n", wdt_io);
w83697hf_unlock();
if (w83697hf_get_reg(0x20) == 0x60) {
printk (KERN_INFO PFX "watchdog found at address 0x%x\n", wdt_io);
w83697hf_lock();
return 0;
}
w83697hf_lock(); /* Reprotect in case it was a compatible device */
printk (KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io);
release_region(wdt_io, 2);
return -EIO;
}
static int __init
wdt_init(void)
{
int ret;
int ret, autodetect;
spin_lock_init(&io_lock);
printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");
autodetect = wdt_io == 0;
if (autodetect)
wdt_io = 0x2e;
if (!w83697hf_check_wdt())
goto found;
if (autodetect) {
wdt_io = 0x4e;
if (!w83697hf_check_wdt())
goto found;
}
printk (KERN_ERR PFX "No W83697HF/HG could be found\n");
ret = -EIO;
goto out;
found:
if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n",
WATCHDOG_TIMEOUT);
}
if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
wdt_io);
ret = -EIO;
goto out;
}
w83697hf_init();
ret = register_reboot_notifier(&wdt_notifier);