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hwmon: (gl518sm) Report error on invalid fan div value 

If the user attempts to write a fan clock divider not supported by
the chip, an error should be returned.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
This commit is contained in:
Jean Delvare 2007-10-22 17:47:58 +02:00 committed by Mark M. Hoffman
parent da6848da29
commit 21df67b191
1 changed files with 12 additions and 2 deletions
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14
drivers/hwmon/gl518sm.c
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@ -107,7 +107,6 @@ static inline u8 FAN_TO_REG(long rpm, int div)
#define VDD_TO_REG(val) (SENSORS_LIMIT((((val)*4+47)/95),0,255))
#define VDD_FROM_REG(val) (((val)*95+2)/4)
#define DIV_TO_REG(val) ((val)==4?2:(val)==2?1:(val)==1?0:3)
#define DIV_FROM_REG(val) (1 << (val))
#define BEEP_MASK_TO_REG(val) ((val) & 0x7f & data->alarm_mask)
@ -302,9 +301,20 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
int regvalue;
unsigned long val = simple_strtoul(buf, NULL, 10);
switch (val) {
case 1: val = 0; break;
case 2: val = 1; break;
case 4: val = 2; break;
case 8: val = 3; break;
default:
dev_err(dev, "Invalid fan clock divider %lu, choose one "
"of 1, 2, 4 or 8\n", val);
return -EINVAL;
}
mutex_lock(&data->update_lock);
regvalue = gl518_read_value(client, GL518_REG_MISC);
data->fan_div[nr] = DIV_TO_REG(val);
data->fan_div[nr] = val;
regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
| (data->fan_div[nr] << (6 - 2 * nr));
gl518_write_value(client, GL518_REG_MISC, regvalue);