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hwmon: (lm75) Add support for writing conversion time for TMP112 

TMP112 uses an uncommon method to write the conversion time: its
configuration register is 16 bit wide, and the conversion time is
configured in its second byte.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2019-08-08 19:12:55 -07:00
parent 040b106ff8
commit cee04a013a
1 changed files with 26 additions and 9 deletions
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35
drivers/hwmon/lm75.c
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@ -242,6 +242,8 @@ static const struct lm75_params device_params[] = {
.clr_mask = 1 << 7, /* no one-shot mode*/
.default_resolution = 12,
.default_sample_time = MSEC_PER_SEC / 4,
.num_sample_times = 4,
.sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
},
[tmp175] = {
.set_mask = 3 << 5, /* 12-bit mode */
@ -391,21 +393,36 @@ static int lm75_write_temp(struct device *dev, u32 attr, long temp)
static int lm75_update_interval(struct device *dev, long val)
{
struct lm75_data *data = dev_get_drvdata(dev);
unsigned int reg;
u8 index;
s32 err;
index = find_closest(val, data->params->sample_times,
(int)data->params->num_sample_times);
err = lm75_write_config(data, lm75_sample_set_masks[index],
LM75_SAMPLE_CLEAR_MASK);
if (err)
return err;
data->sample_time = data->params->sample_times[index];
if (data->params->resolutions)
data->resolution = data->params->resolutions[index];
switch (data->kind) {
default:
err = lm75_write_config(data, lm75_sample_set_masks[index],
LM75_SAMPLE_CLEAR_MASK);
if (err)
return err;
data->sample_time = data->params->sample_times[index];
if (data->params->resolutions)
data->resolution = data->params->resolutions[index];
break;
case tmp112:
err = regmap_read(data->regmap, LM75_REG_CONF, &reg);
if (err < 0)
return err;
reg &= ~0x00c0;
reg |= (3 - index) << 6;
err = regmap_write(data->regmap, LM75_REG_CONF, reg);
if (err < 0)
return err;
data->sample_time = data->params->sample_times[index];
break;
}
return 0;
}
@ -489,7 +506,7 @@ static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg)
static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
{
return reg == LM75_REG_TEMP;
return reg == LM75_REG_TEMP || reg == LM75_REG_CONF;
}
static const struct regmap_config lm75_regmap_config = {