diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/accel/kxcjk-1013.c | 206 |
1 files changed, 156 insertions, 50 deletions
diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c index 7941cf2d31ee..b32bdd10e0c4 100644 --- a/drivers/iio/accel/kxcjk-1013.c +++ b/drivers/iio/accel/kxcjk-1013.c @@ -21,6 +21,8 @@ #include <linux/string.h> #include <linux/acpi.h> #include <linux/gpio/consumer.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/buffer.h> @@ -71,15 +73,17 @@ #define KXCJK1013_DATA_MASK_12_BIT 0x0FFF #define KXCJK1013_MAX_STARTUP_TIME_US 100000 +#define KXCJK1013_SLEEP_DELAY_MS 2000 + struct kxcjk1013_data { struct i2c_client *client; struct iio_trigger *trig; bool trig_mode; struct mutex mutex; s16 buffer[8]; - int power_state; u8 odr_bits; bool active_high_intr; + bool trigger_on; }; enum kxcjk1013_axis { @@ -138,6 +142,25 @@ static int kxcjk1013_set_mode(struct kxcjk1013_data *data, return 0; } +static int kxcjk1013_get_mode(struct kxcjk1013_data *data, + enum kxcjk1013_mode *mode) +{ + int ret; + + ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1); + if (ret < 0) { + dev_err(&data->client->dev, "Error reading reg_ctrl1\n"); + return ret; + } + + if (ret & KXCJK1013_REG_CTRL1_BIT_PC1) + *mode = OPERATION; + else + *mode = STANDBY; + + return 0; +} + static int kxcjk1013_chip_init(struct kxcjk1013_data *data) { int ret; @@ -201,6 +224,41 @@ static int kxcjk1013_chip_init(struct kxcjk1013_data *data) return ret; } + ret = kxcjk1013_set_mode(data, OPERATION); + if (ret < 0) + return ret; + + return 0; +} + +static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(odr_start_up_times); ++i) { + if (odr_start_up_times[i].odr_bits == data->odr_bits) + return odr_start_up_times[i].usec; + } + + return KXCJK1013_MAX_STARTUP_TIME_US; +} + +static int kxcjk1013_set_power_state(struct kxcjk1013_data *data, bool on) +{ + int ret; + + if (on) + ret = pm_runtime_get_sync(&data->client->dev); + else { + pm_runtime_mark_last_busy(&data->client->dev); + ret = pm_runtime_put_autosuspend(&data->client->dev); + } + if (ret < 0) { + dev_err(&data->client->dev, + "Failed: kxcjk1013_set_power_state for %d\n", on); + return ret; + } + return 0; } @@ -208,6 +266,11 @@ static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data, bool status) { int ret; + enum kxcjk1013_mode store_mode; + + ret = kxcjk1013_get_mode(data, &store_mode); + if (ret < 0) + return ret; /* This is requirement by spec to change state to STANDBY */ ret = kxcjk1013_set_mode(data, STANDBY); @@ -250,7 +313,13 @@ static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data, return ret; } - return ret; + if (store_mode == OPERATION) { + ret = kxcjk1013_set_mode(data, OPERATION); + if (ret < 0) + return ret; + } + + return 0; } static int kxcjk1013_convert_freq_to_bit(int val, int val2) @@ -271,6 +340,11 @@ static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2) { int ret; int odr_bits; + enum kxcjk1013_mode store_mode; + + ret = kxcjk1013_get_mode(data, &store_mode); + if (ret < 0) + return ret; odr_bits = kxcjk1013_convert_freq_to_bit(val, val2); if (odr_bits < 0) @@ -290,9 +364,7 @@ static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2) data->odr_bits = odr_bits; - /* Check, if the ODR is changed after data enable */ - if (data->power_state) { - /* Set the state back to operation */ + if (store_mode == OPERATION) { ret = kxcjk1013_set_mode(data, OPERATION); if (ret < 0) return ret; @@ -331,18 +403,6 @@ static int kxcjk1013_get_acc_reg(struct kxcjk1013_data *data, int axis) return ret; } -static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(odr_start_up_times); ++i) { - if (odr_start_up_times[i].odr_bits == data->odr_bits) - return odr_start_up_times[i].usec; - } - - return KXCJK1013_MAX_STARTUP_TIME_US; -} - static int kxcjk1013_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -356,29 +416,25 @@ static int kxcjk1013_read_raw(struct iio_dev *indio_dev, if (iio_buffer_enabled(indio_dev)) ret = -EBUSY; else { - int sleep_val; - - ret = kxcjk1013_set_mode(data, OPERATION); + ret = kxcjk1013_set_power_state(data, true); if (ret < 0) { mutex_unlock(&data->mutex); return ret; } - ++data->power_state; - sleep_val = kxcjk1013_get_startup_times(data); - if (sleep_val < 20000) - usleep_range(sleep_val, 20000); - else - msleep_interruptible(sleep_val/1000); ret = kxcjk1013_get_acc_reg(data, chan->scan_index); - if (--data->power_state == 0) - kxcjk1013_set_mode(data, STANDBY); + if (ret < 0) { + kxcjk1013_set_power_state(data, false); + mutex_unlock(&data->mutex); + return ret; + } + *val = sign_extend32(ret >> 4, 11); + ret = kxcjk1013_set_power_state(data, false); } mutex_unlock(&data->mutex); if (ret < 0) return ret; - *val = sign_extend32(ret >> 4, 11); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: @@ -520,20 +576,21 @@ static int kxcjk1013_data_rdy_trigger_set_state(struct iio_trigger *trig, { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); struct kxcjk1013_data *data = iio_priv(indio_dev); + int ret; + + if (state && data->trigger_on) + return 0; mutex_lock(&data->mutex); - if (state) { - kxcjk1013_chip_setup_interrupt(data, true); - kxcjk1013_set_mode(data, OPERATION); - ++data->power_state; - } else { - if (--data->power_state) { + ret = kxcjk1013_chip_setup_interrupt(data, state); + if (!ret) { + ret = kxcjk1013_set_power_state(data, state); + if (ret < 0) { mutex_unlock(&data->mutex); - return 0; + return ret; } - kxcjk1013_chip_setup_interrupt(data, false); - kxcjk1013_set_mode(data, STANDBY); } + data->trigger_on = state; mutex_unlock(&data->mutex); return 0; @@ -661,14 +718,25 @@ static int kxcjk1013_probe(struct i2c_client *client, } } - ret = devm_iio_device_register(&client->dev, indio_dev); + ret = iio_device_register(indio_dev); if (ret < 0) { dev_err(&client->dev, "unable to register iio device\n"); goto err_buffer_cleanup; } + ret = pm_runtime_set_active(&client->dev); + if (ret) + goto err_iio_unregister; + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, + KXCJK1013_SLEEP_DELAY_MS); + pm_runtime_use_autosuspend(&client->dev); + return 0; +err_iio_unregister: + iio_device_unregister(indio_dev); err_buffer_cleanup: if (data->trig_mode) iio_triggered_buffer_cleanup(indio_dev); @@ -687,6 +755,12 @@ static int kxcjk1013_remove(struct i2c_client *client) struct iio_dev *indio_dev = i2c_get_clientdata(client); struct kxcjk1013_data *data = iio_priv(indio_dev); + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + pm_runtime_put_noidle(&client->dev); + + iio_device_unregister(indio_dev); + if (data->trig_mode) { iio_triggered_buffer_cleanup(indio_dev); iio_trigger_unregister(data->trig); @@ -705,35 +779,67 @@ static int kxcjk1013_suspend(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct kxcjk1013_data *data = iio_priv(indio_dev); + int ret; mutex_lock(&data->mutex); - kxcjk1013_set_mode(data, STANDBY); + ret = kxcjk1013_set_mode(data, STANDBY); mutex_unlock(&data->mutex); - return 0; + return ret; } static int kxcjk1013_resume(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct kxcjk1013_data *data = iio_priv(indio_dev); + int ret = 0; mutex_lock(&data->mutex); + /* Check, if the suspend occured while active */ + if (data->trigger_on) + ret = kxcjk1013_set_mode(data, OPERATION); + mutex_unlock(&data->mutex); - if (data->power_state) - kxcjk1013_set_mode(data, OPERATION); + return ret; +} +#endif - mutex_unlock(&data->mutex); +#ifdef CONFIG_PM_RUNTIME +static int kxcjk1013_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct kxcjk1013_data *data = iio_priv(indio_dev); - return 0; + return kxcjk1013_set_mode(data, STANDBY); } -static SIMPLE_DEV_PM_OPS(kxcjk1013_pm_ops, kxcjk1013_suspend, kxcjk1013_resume); -#define KXCJK1013_PM_OPS (&kxcjk1013_pm_ops) -#else -#define KXCJK1013_PM_OPS NULL +static int kxcjk1013_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct kxcjk1013_data *data = iio_priv(indio_dev); + int ret; + int sleep_val; + + ret = kxcjk1013_set_mode(data, OPERATION); + if (ret < 0) + return ret; + + sleep_val = kxcjk1013_get_startup_times(data); + if (sleep_val < 20000) + usleep_range(sleep_val, 20000); + else + msleep_interruptible(sleep_val/1000); + + return 0; +} #endif +static const struct dev_pm_ops kxcjk1013_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(kxcjk1013_suspend, kxcjk1013_resume) + SET_RUNTIME_PM_OPS(kxcjk1013_runtime_suspend, + kxcjk1013_runtime_resume, NULL) +}; + static const struct acpi_device_id kx_acpi_match[] = { {"KXCJ1013", 0}, { }, @@ -751,7 +857,7 @@ static struct i2c_driver kxcjk1013_driver = { .driver = { .name = KXCJK1013_DRV_NAME, .acpi_match_table = ACPI_PTR(kx_acpi_match), - .pm = KXCJK1013_PM_OPS, + .pm = &kxcjk1013_pm_ops, }, .probe = kxcjk1013_probe, .remove = kxcjk1013_remove, |