@@ -111,6 +111,7 @@ struct ina3221_input {
* @inputs: Array of channel input source specific structures
* @lock: mutex lock to serialize sysfs attribute accesses
* @reg_config: Register value of INA3221_CONFIG
+ * @single_shot: running in single-shot operating mode
*/
struct ina3221_data {
struct device *pm_dev;
@@ -119,6 +120,8 @@ struct ina3221_data {
struct ina3221_input inputs[INA3221_NUM_CHANNELS];
struct mutex lock;
u32 reg_config;
+
+ bool single_shot;
};
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))
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);
if (ret)
return ret;
@@ -232,6 +240,11 @@ static int ina3221_read_curr(struct device *dev, u32 attr,
if (!ina3221_is_enabled(ina, channel))
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);
if (ret)
return ret;
@@ -617,6 +630,8 @@ static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
if (!np)
return 0;
+ ina->single_shot = of_property_read_bool(np, "ti,single-shot");
+
for_each_child_of_node(np, child) {
ret = ina3221_probe_child_from_dt(dev, child, ina);
if (ret)
@@ -666,6 +681,10 @@ static int ina3221_probe(struct i2c_client *client,
/* The driver will be reset, so use reset value */
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 */
for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
if (ina->inputs[i].disconnected)
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> --- Changelog v2->v3: * Dropped useless if condition by using the return value directly. v1->v2: * Replaced the useless mode defines with a boolean variable. drivers/hwmon/ina3221.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)