diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2024-06-27 02:21:54 +0200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2024-07-08 16:52:36 +0200 |
| commit | af4d04b8ce08a734889fb0777059063635242614 (patch) | |
| tree | 8e49b82eacef331972fe71c6506bee0c455fefc7 /drivers/hwmon/amc6821.c | |
| parent | hwmon: (w83627ehf) Fix underflows seen when writing limit attributes (diff) | |
| download | linux-af4d04b8ce08a734889fb0777059063635242614.tar.xz linux-af4d04b8ce08a734889fb0777059063635242614.zip | |
hwmon: (amc6821) Stop accepting invalid pwm values
The pwm value range is well defined from 0..255. Don't accept any values
outside this range.
This changes the valid range of pwm1_auto_point2_pwm from 0..254 to 0..255,
meaning it can now be equivalent to not only pwm1_auto_point1_pwm (which is
always 0) but also to pwm1_auto_point3_pwm (which is always 255). While
that may not be practical, there seems to be no technical reason for
preventing a user from doing it.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/amc6821.c')
| -rw-r--r-- | drivers/hwmon/amc6821.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c index 9b02b304c2f5..dc35e9b21f91 100644 --- a/drivers/hwmon/amc6821.c +++ b/drivers/hwmon/amc6821.c @@ -355,13 +355,13 @@ static ssize_t pwm1_store(struct device *dev, { struct amc6821_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; - long val; - int ret = kstrtol(buf, 10, &val); + u8 val; + int ret = kstrtou8(buf, 10, &val); if (ret) return ret; mutex_lock(&data->update_lock); - data->pwm1 = clamp_val(val , 0, 255); + data->pwm1 = val; i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1); mutex_unlock(&data->update_lock); return count; @@ -558,13 +558,15 @@ static ssize_t pwm1_auto_point_pwm_store(struct device *dev, struct amc6821_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int dpwm; - long val; - int ret = kstrtol(buf, 10, &val); + u8 val; + int ret; + + ret = kstrtou8(buf, 10, &val); if (ret) return ret; mutex_lock(&data->update_lock); - data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254); + data->pwm1_auto_point_pwm[1] = val; if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP, data->pwm1_auto_point_pwm[1])) { dev_err(&client->dev, "Register write error, aborting.\n"); |