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hwmon: (max6639) Set reasonable default PWM frequency

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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>
This commit is contained in:
stigge@antcom.de 2011-01-29 17:04:01 +01:00 committed by Guenter Roeck
parent a5b79d62f2
commit 177f3b920c
1 changed files with 16 additions and 2 deletions
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18
drivers/hwmon/max6639.c
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@ -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;
}