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authorGuenter Roeck <linux@roeck-us.net>2019-08-09 05:12:55 +0300
committerGuenter Roeck <linux@roeck-us.net>2019-09-03 22:47:17 +0300
commitcee04a013a4a4f7556b32bb6c33b3d6f1bd264c9 (patch)
treee9df8b8a1d131975d5ba2f446d9992fce08b0a6a /drivers/hwmon/lm75.c
parent040b106ff8d6dcef5704f96ea84edfe28addb4a0 (diff)
downloadlinux-cee04a013a4a4f7556b32bb6c33b3d6f1bd264c9.tar.xz
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>
Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c35
1 files changed, 26 insertions, 9 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 644da2620a26..ce0f6c671b8f 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -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 = {