Commit e21b5b1f authored by Mårten Lindahl's avatar Mårten Lindahl Committed by Jonathan Cameron

iio: light: vcnl4000: Preserve conf bits when toggle power

As the vcnl4040 and vcnl4200 chip uses runtime power management for
turning the ambient light and proximity sensors on/off, it overwrites
the entire register each time. In ALS_CONF register bit fields ALS_IT,
ALS_PERS, ALS_INT_EN are overwritten. In PS_CONF1 register bit fields
PS_DUTY, PS_PERS, PS_IT, PS_HD, and PS_INT are overwritten.

Add functions for preserving the affected bit fields when changing power
state.
Signed-off-by: default avatarMårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20220926091900.1724105-2-marten.lindahl@axis.comSigned-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 3f4033a8
...@@ -74,6 +74,9 @@ ...@@ -74,6 +74,9 @@
#define VCNL4000_PROX_EN BIT(1) /* start proximity measurement */ #define VCNL4000_PROX_EN BIT(1) /* start proximity measurement */
#define VCNL4000_SELF_TIMED_EN BIT(0) /* start self-timed measurement */ #define VCNL4000_SELF_TIMED_EN BIT(0) /* start self-timed measurement */
#define VCNL4040_ALS_CONF_ALS_SHUTDOWN BIT(0)
#define VCNL4040_PS_CONF1_PS_SHUTDOWN BIT(0)
/* Bit masks for interrupt registers. */ /* Bit masks for interrupt registers. */
#define VCNL4010_INT_THR_SEL BIT(0) /* Select threshold interrupt source */ #define VCNL4010_INT_THR_SEL BIT(0) /* Select threshold interrupt source */
#define VCNL4010_INT_THR_EN BIT(1) /* Threshold interrupt type */ #define VCNL4010_INT_THR_EN BIT(1) /* Threshold interrupt type */
...@@ -188,16 +191,61 @@ static int vcnl4000_init(struct vcnl4000_data *data) ...@@ -188,16 +191,61 @@ static int vcnl4000_init(struct vcnl4000_data *data)
return data->chip_spec->set_power_state(data, true); return data->chip_spec->set_power_state(data, true);
}; };
static ssize_t vcnl4000_write_als_enable(struct vcnl4000_data *data, bool en)
{
int ret;
mutex_lock(&data->vcnl4000_lock);
ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
if (ret < 0)
goto out;
if (en)
ret &= ~VCNL4040_ALS_CONF_ALS_SHUTDOWN;
else
ret |= VCNL4040_ALS_CONF_ALS_SHUTDOWN;
ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, ret);
out:
mutex_unlock(&data->vcnl4000_lock);
return ret;
}
static ssize_t vcnl4000_write_ps_enable(struct vcnl4000_data *data, bool en)
{
int ret;
mutex_lock(&data->vcnl4000_lock);
ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
if (ret < 0)
goto out;
if (en)
ret &= ~VCNL4040_PS_CONF1_PS_SHUTDOWN;
else
ret |= VCNL4040_PS_CONF1_PS_SHUTDOWN;
ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, ret);
out:
mutex_unlock(&data->vcnl4000_lock);
return ret;
}
static int vcnl4200_set_power_state(struct vcnl4000_data *data, bool on) static int vcnl4200_set_power_state(struct vcnl4000_data *data, bool on)
{ {
u16 val = on ? 0 /* power on */ : 1 /* shut down */;
int ret; int ret;
ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, val); ret = vcnl4000_write_als_enable(data, on);
if (ret < 0) if (ret < 0)
return ret; return ret;
ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, val); ret = vcnl4000_write_ps_enable(data, on);
if (ret < 0) if (ret < 0)
return ret; return ret;
......
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