The vdd and leda supplies must be powered on for the chip to function and can be powered off during system suspend.
This was originally based on a patch by Ondrej Jirman[1], but has been rewritten since. 1: https://codeberg.org/megi/linux/commit/a933aff8b7a0e6e3c9cf1d832dcba07022bbfa82 Signed-off-by: Aren Moynihan <a...@peacevolution.org> --- Notes: Changes in v4: - fix variable declaration order in stk3310_resume to match the rest of the driver Changes in v3: - use bulk regulators instead of two individual ones - handle cleanup using devm callbacks instead of the remove function Changes in v2: - always enable / disable regulators and rely on a dummy regulator if one isn't specified - replace usleep_range with fsleep - reorder includes so iio headers are last - add missing error handling to resume drivers/iio/light/stk3310.c | 76 ++++++++++++++++++++++++++++++++++++- 1 file changed, 74 insertions(+), 2 deletions(-) diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c index 181b7acb3f96..f93689c61f44 100644 --- a/drivers/iio/light/stk3310.c +++ b/drivers/iio/light/stk3310.c @@ -13,6 +13,8 @@ #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/regmap.h> +#include <linux/regulator/consumer.h> + #include <linux/iio/events.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -130,6 +132,7 @@ struct stk3310_data { struct regmap_field *reg_int_ps; struct regmap_field *reg_flag_psint; struct regmap_field *reg_flag_nf; + struct regulator_bulk_data supplies[2]; }; static const struct iio_event_spec stk3310_events[] = { @@ -621,6 +624,31 @@ static irqreturn_t stk3310_irq_event_handler(int irq, void *private) return IRQ_HANDLED; } +static int stk3310_regulators_enable(struct stk3310_data *data) +{ + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies); + if (ret) + return ret; + + /* we need a short delay to allow the chip time to power on */ + fsleep(1000); + + return 0; +} + +static void stk3310_regulators_disable(void *private) +{ + int ret; + struct stk3310_data *data = private; + struct device *dev = &data->client->dev; + + ret = regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies); + if (ret) + dev_err(dev, "failed to disable regulators: %d\n", ret); +} + static int stk3310_probe(struct i2c_client *client) { int ret; @@ -642,6 +670,13 @@ static int stk3310_probe(struct i2c_client *client) devm_mutex_init(&client->dev, &data->lock); + data->supplies[0].supply = "vdd"; + data->supplies[1].supply = "leda"; + ret = devm_regulator_bulk_get(&client->dev, ARRAY_SIZE(data->supplies), + data->supplies); + if (ret) + return dev_err_probe(&client->dev, ret, "get regulators failed\n"); + ret = stk3310_regmap_init(data); if (ret < 0) return ret; @@ -652,6 +687,16 @@ static int stk3310_probe(struct i2c_client *client) indio_dev->channels = stk3310_channels; indio_dev->num_channels = ARRAY_SIZE(stk3310_channels); + ret = stk3310_regulators_enable(data); + if (ret) + return dev_err_probe(&client->dev, ret, + "regulator enable failed\n"); + + ret = devm_add_action_or_reset(&client->dev, stk3310_regulators_disable, data); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to register regulator cleanup\n"); + ret = stk3310_init(indio_dev); if (ret < 0) return ret; @@ -682,18 +727,45 @@ static int stk3310_probe(struct i2c_client *client) static int stk3310_suspend(struct device *dev) { struct stk3310_data *data; + int ret; data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); - return stk3310_set_state(data, STK3310_STATE_STANDBY); + ret = stk3310_set_state(data, STK3310_STATE_STANDBY); + if (ret) + return ret; + + regcache_mark_dirty(data->regmap); + + ret = regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies); + if (ret) { + dev_err(dev, "failed to disable regulators: %d\n", ret); + return ret; + } + + return 0; } static int stk3310_resume(struct device *dev) { - u8 state = 0; + int ret; struct stk3310_data *data; + u8 state = 0; data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + + ret = stk3310_regulators_enable(data); + if (ret) { + dev_err(dev, "Failed to re-enable regulators: %d", ret); + return ret; + } + + ret = regcache_sync(data->regmap); + if (ret) { + dev_err(dev, "Failed to restore registers: %d\n", ret); + return ret; + } + if (data->ps_enabled) state |= STK3310_STATE_EN_PS; if (data->als_enabled) -- 2.47.0
