iio: accel: adxl313: implement power-save on inactivity

Configure the link bit to associate activity and inactivity sensing,
allowing the sensor to reflect its internal power-saving state.
Additionally, enable the auto-sleep bit to transition the sensor into
auto-sleep mode during periods of inactivity, as outlined in the
datasheet.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
Link: https://patch.msgid.link/20250702230819.19353-7-l.rubusch@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/adxl313.h b/drivers/iio/accel/adxl313.h
index d7e8cb44855b7087112af5ecc3bbbe4faf5c215f..75ef54b60f758d3e325f1ae8faca074abf3b0c6d 100644 (file)
--- a/drivers/iio/accel/adxl313.h
+++ b/drivers/iio/accel/adxl313.h
@@ -41,6 +41,9 @@
 #define ADXL313_RATE_BASE              6
 
 #define ADXL313_POWER_CTL_MSK          BIT(3)
+#define ADXL313_POWER_CTL_INACT_MSK    GENMASK(5, 4)
+#define ADXL313_POWER_CTL_LINK         BIT(5)
+#define ADXL313_POWER_CTL_AUTO_SLEEP   BIT(4)
 
 #define ADXL313_RANGE_MSK              GENMASK(1, 0)
 #define ADXL313_RANGE_MAX              3

diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
index 5b6faa83be02b309ac61ec8c3b82806940b046ed..fe2a7d77fdfb579fcbb9b7261c32dc08d28fca76 100644 (file)
--- a/drivers/iio/accel/adxl313_core.c
+++ b/drivers/iio/accel/adxl313_core.c
@@ -396,6 +396,23 @@ static int adxl313_is_act_inact_en(struct adxl313_data *data,
        return adxl313_act_int_reg[type] & regval;
 }
 
+static int adxl313_set_act_inact_linkbit(struct adxl313_data *data, bool en)
+{
+       int act_en, inact_en;
+
+       act_en = adxl313_is_act_inact_en(data, ADXL313_ACTIVITY);
+       if (act_en < 0)
+               return act_en;
+
+       inact_en = adxl313_is_act_inact_en(data, ADXL313_INACTIVITY);
+       if (inact_en < 0)
+               return inact_en;
+
+       return regmap_assign_bits(data->regmap, ADXL313_REG_POWER_CTL,
+                                 ADXL313_POWER_CTL_AUTO_SLEEP | ADXL313_POWER_CTL_LINK,
+                                 en && act_en && inact_en);
+}
+
 static int adxl313_set_act_inact_en(struct adxl313_data *data,
                                    enum adxl313_activity_type type,
                                    bool cmd_en)
@@ -455,6 +472,11 @@ static int adxl313_set_act_inact_en(struct adxl313_data *data,
        if (ret)
                return ret;
 
+       /* Set link-bit and auto-sleep only when ACT and INACT are enabled */
+       ret = adxl313_set_act_inact_linkbit(data, cmd_en);
+       if (ret)
+               return ret;
+
        return adxl313_set_measure_en(data, true);
 }