diff options
| author | stigge@antcom.de <stigge@antcom.de> | 2011-01-29 17:04:01 +0100 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-03-14 22:36:25 -0700 |
| commit | 177f3b920cf6d1ab6d97f0978f866a8a711918e6 (patch) | |
| tree | 6cd6aca172680d1627f8f1728f5a0d3e4c17e99b /drivers/hwmon/max6639.c | |
| parent | a5b79d62f2e6d1b0d44bcdafce46f47bf355b9fe (diff) | |
| download | linux-177f3b920cf6d1ab6d97f0978f866a8a711918e6.tar.bz2 | |
hwmon: (max6639) Set reasonable default PWM frequency
This patch initializes register CONFIG3 to a reasonable default PWM frequency
of 25kHz, to prevent audible sound in fan.
Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'drivers/hwmon/max6639.c')
| -rw-r--r-- | drivers/hwmon/max6639.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c index 40fd878e53dc..f20d9978ee78 100644 --- a/drivers/hwmon/max6639.c +++ b/drivers/hwmon/max6639.c @@ -64,9 +64,12 @@ static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; #define MAX6639_GCONFIG_POR 0x40 #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 #define MAX6639_GCONFIG_CH2_LOCAL 0x10 +#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 #define MAX6639_FAN_CONFIG1_PWM 0x80 +#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 + static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; #define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \ @@ -430,7 +433,7 @@ static int max6639_init_client(struct i2c_client *client) int rpm_range = 1; /* default: 4000 RPM */ int err = 0; - /* Reset chip to default values */ + /* Reset chip to default values, see below for GCONFIG setup */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR); if (err) @@ -472,6 +475,16 @@ static int max6639_init_client(struct i2c_client *client) if (err) goto exit; + /* + * /THERM full speed enable, + * PWM frequency 25kHz, see also GCONFIG below + */ + err = i2c_smbus_write_byte_data(client, + MAX6639_REG_FAN_CONFIG3(i), + MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); + if (err) + goto exit; + /* Max. temp. 80C/90C/100C */ data->temp_therm[i] = 80; data->temp_alert[i] = 90; @@ -500,7 +513,8 @@ static int max6639_init_client(struct i2c_client *client) } /* Start monitoring */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, - MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL); + MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | + MAX6639_GCONFIG_PWM_FREQ_HI); exit: return err; } |