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hwmon: (ina3221) Implement ti,single-shot DT property 

By default, ina3221, as a hardware monitor, continuously measures
the inputs and generates corresponding data. However, for battery
powered devices, this mode might be power consuming.

The DT binding doc is updated with a new boolean type property to
allow changing the default operating mode from consuming mode to
single-shot mode, which will measure input on demand and then shut
down to save power.

So this patch implements the DT property accordingly.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Nicolin Chen 2019-01-17 15:12:53 -08:00 committed by Guenter Roeck
parent 2e1ce20149
commit 43dece162d
1 changed files with 19 additions and 0 deletions
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19
drivers/hwmon/ina3221.c
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@ -111,6 +111,7 @@ struct ina3221_input {
* @inputs: Array of channel input source specific structures * @inputs: Array of channel input source specific structures
* @lock: mutex lock to serialize sysfs attribute accesses * @lock: mutex lock to serialize sysfs attribute accesses
* @reg_config: Register value of INA3221_CONFIG * @reg_config: Register value of INA3221_CONFIG
* @single_shot: running in single-shot operating mode
*/ */
struct ina3221_data { struct ina3221_data {
struct device *pm_dev; struct device *pm_dev;
@ -119,6 +120,8 @@ struct ina3221_data {
struct ina3221_input inputs[INA3221_NUM_CHANNELS]; struct ina3221_input inputs[INA3221_NUM_CHANNELS];
struct mutex lock; struct mutex lock;
u32 reg_config; u32 reg_config;
bool single_shot;
}; };
static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel) static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
@ -188,6 +191,11 @@ static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
if (!ina3221_is_enabled(ina, channel)) if (!ina3221_is_enabled(ina, channel))
return -ENODATA; return -ENODATA;
/* Write CONFIG register to trigger a single-shot measurement */
if (ina->single_shot)
regmap_write(ina->regmap, INA3221_CONFIG,
ina->reg_config);
ret = ina3221_wait_for_data(ina); ret = ina3221_wait_for_data(ina);
if (ret) if (ret)
return ret; return ret;
@ -232,6 +240,11 @@ static int ina3221_read_curr(struct device *dev, u32 attr,
if (!ina3221_is_enabled(ina, channel)) if (!ina3221_is_enabled(ina, channel))
return -ENODATA; return -ENODATA;
/* Write CONFIG register to trigger a single-shot measurement */
if (ina->single_shot)
regmap_write(ina->regmap, INA3221_CONFIG,
ina->reg_config);
ret = ina3221_wait_for_data(ina); ret = ina3221_wait_for_data(ina);
if (ret) if (ret)
return ret; return ret;
@ -614,6 +627,8 @@ static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
if (!np) if (!np)
return 0; return 0;
ina->single_shot = of_property_read_bool(np, "ti,single-shot");
for_each_child_of_node(np, child) { for_each_child_of_node(np, child) {
ret = ina3221_probe_child_from_dt(dev, child, ina); ret = ina3221_probe_child_from_dt(dev, child, ina);
if (ret) if (ret)
@ -663,6 +678,10 @@ static int ina3221_probe(struct i2c_client *client,
/* The driver will be reset, so use reset value */ /* The driver will be reset, so use reset value */
ina->reg_config = INA3221_CONFIG_DEFAULT; ina->reg_config = INA3221_CONFIG_DEFAULT;
/* Clear continuous bit to use single-shot mode */
if (ina->single_shot)
ina->reg_config &= ~INA3221_CONFIG_MODE_CONTINUOUS;
/* Disable channels if their inputs are disconnected */ /* Disable channels if their inputs are disconnected */
for (i = 0; i < INA3221_NUM_CHANNELS; i++) { for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
if (ina->inputs[i].disconnected) if (ina->inputs[i].disconnected)