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| author | Jean Delvare <khali@linux-fr.org> | 2010-10-28 20:31:50 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2010-10-28 20:31:50 +0200 |
| commit | f6c61cff8bcb58b8dfb645d4243a049908c02024 (patch) | |
| tree | bff2919dcf335f38cb36bdbd27fd5c5870e4b0e9 /drivers/hwmon/lm85.c | |
| parent | c36364dbf38382ef6be2fb99a3ce361a679c0ecb (diff) | |
| download | lwn-f6c61cff8bcb58b8dfb645d4243a049908c02024.tar.gz lwn-f6c61cff8bcb58b8dfb645d4243a049908c02024.zip | |
hwmon: (lm85) Add support for ADT7468 high-frequency PWM mode
The ADT7468 supports a high-frequency PWM output mode where all PWM
outputs are driven by a 22.5 kHz clock. Add support for this mode, and
document it, as it may surprise the user that setting one PWM output
frequency also affects the other PWM outputs.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'drivers/hwmon/lm85.c')
| -rw-r--r-- | drivers/hwmon/lm85.c | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c index 2e8f0c9458d4..1e229847f37a 100644 --- a/drivers/hwmon/lm85.c +++ b/drivers/hwmon/lm85.c @@ -64,9 +64,12 @@ enum chips { #define LM85_REG_VERSTEP 0x3f #define ADT7468_REG_CFG5 0x7c -#define ADT7468_OFF64 0x01 +#define ADT7468_OFF64 (1 << 0) +#define ADT7468_HFPWM (1 << 1) #define IS_ADT7468_OFF64(data) \ ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_OFF64)) +#define IS_ADT7468_HFPWM(data) \ + ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_HFPWM)) /* These are the recognized values for the above regs */ #define LM85_COMPANY_NATIONAL 0x01 @@ -567,8 +570,14 @@ static ssize_t show_pwm_freq(struct device *dev, { int nr = to_sensor_dev_attr(attr)->index; struct lm85_data *data = lm85_update_device(dev); - return sprintf(buf, "%d\n", FREQ_FROM_REG(data->freq_map, - data->pwm_freq[nr])); + int freq; + + if (IS_ADT7468_HFPWM(data)) + freq = 22500; + else + freq = FREQ_FROM_REG(data->freq_map, data->pwm_freq[nr]); + + return sprintf(buf, "%d\n", freq); } static ssize_t set_pwm_freq(struct device *dev, @@ -580,10 +589,22 @@ static ssize_t set_pwm_freq(struct device *dev, long val = simple_strtol(buf, NULL, 10); mutex_lock(&data->update_lock); - data->pwm_freq[nr] = FREQ_TO_REG(data->freq_map, val); - lm85_write_value(client, LM85_REG_AFAN_RANGE(nr), - (data->zone[nr].range << 4) - | data->pwm_freq[nr]); + /* The ADT7468 has a special high-frequency PWM output mode, + * where all PWM outputs are driven by a 22.5 kHz clock. + * This might confuse the user, but there's not much we can do. */ + if (data->type == adt7468 && val >= 11300) { /* High freq. mode */ + data->cfg5 &= ~ADT7468_HFPWM; + lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5); + } else { /* Low freq. mode */ + data->pwm_freq[nr] = FREQ_TO_REG(data->freq_map, val); + lm85_write_value(client, LM85_REG_AFAN_RANGE(nr), + (data->zone[nr].range << 4) + | data->pwm_freq[nr]); + if (data->type == adt7468) { + data->cfg5 |= ADT7468_HFPWM; + lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5); + } + } mutex_unlock(&data->update_lock); return count; } |