diff options
Diffstat (limited to 'drivers/hwmon/applesmc.c')
| -rw-r--r-- | drivers/hwmon/applesmc.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c index 59266ce60cc2..bc011da79e14 100644 --- a/drivers/hwmon/applesmc.c +++ b/drivers/hwmon/applesmc.c @@ -49,6 +49,9 @@ #define APPLESMC_MAX_DATA_LENGTH 32 +#define APPLESMC_MIN_WAIT 0x0040 +#define APPLESMC_MAX_WAIT 0x8000 + #define APPLESMC_STATUS_MASK 0x0f #define APPLESMC_READ_CMD 0x10 #define APPLESMC_WRITE_CMD 0x11 @@ -172,25 +175,25 @@ static unsigned int key_at_index; static struct workqueue_struct *applesmc_led_wq; /* - * __wait_status - Wait up to 10ms for the status port to get a certain value + * __wait_status - Wait up to 32ms for the status port to get a certain value * (masked with 0x0f), returning zero if the value is obtained. Callers must * hold applesmc_lock. */ static int __wait_status(u8 val) { - unsigned int i; + int us; val = val & APPLESMC_STATUS_MASK; - for (i = 0; i < 1000; i++) { + for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { + udelay(us); if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val) { if (debug) printk(KERN_DEBUG - "Waited %d us for status %x\n", - i*10, val); + "Waited %d us for status %x\n", + 2 * us - APPLESMC_MIN_WAIT, val); return 0; } - udelay(10); } printk(KERN_WARNING "applesmc: wait status failed: %x != %x\n", @@ -206,13 +209,12 @@ static int __wait_status(u8 val) */ static int send_command(u8 cmd) { - int i; - for (i = 0; i < 1000; i++) { + int us; + for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) { outb(cmd, APPLESMC_CMD_PORT); - udelay(5); + udelay(us); if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c) return 0; - udelay(5); } printk(KERN_WARNING "applesmc: command failed: %x -> %x\n", cmd, inb(APPLESMC_CMD_PORT)); |
