iio: accel: kxsd9: Deploy system and runtime PM
This deploys runtime and system PM in the KXSD9 driver: - Use the force_runtime_suspend/resume callbacks as system PM operations. - Add buffer prepare/unprepare callbacks to grab the runtime PM while we're using buffered reads and put get/put_autosuspend in these. - Insert get/put_autosuspend calls anywhere the IO is used from the raw read/write callbacks. - Move the fullscale setting to be cached in the state container so we can restore it properly when coming back from system/runtime suspend. - Set the autosuspend delay to two orders of magnitude that of the sensor start-up time (20ms) so we will autosuspend after 2s. - Register the callbacks in both the SPI and I2C subdrivers. Tested with the I2C KXSD9 on the Qualcomm APQ8060 Dragonboard. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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79383aaec4
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@ -55,6 +55,7 @@ static struct i2c_driver kxsd9_i2c_driver = {
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.driver = {
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.name = "kxsd9",
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.of_match_table = of_match_ptr(kxsd9_of_match),
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.pm = &kxsd9_dev_pm_ops,
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},
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.probe = kxsd9_i2c_probe,
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.remove = kxsd9_i2c_remove,
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@ -43,6 +43,7 @@ MODULE_DEVICE_TABLE(spi, kxsd9_spi_id);
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static struct spi_driver kxsd9_spi_driver = {
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.driver = {
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.name = "kxsd9",
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.pm = &kxsd9_dev_pm_ops,
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},
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.probe = kxsd9_spi_probe,
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.remove = kxsd9_spi_remove,
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@ -23,6 +23,7 @@
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/regulator/consumer.h>
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#include <linux/pm_runtime.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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@ -68,11 +69,13 @@
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* @dev: pointer to the parent device
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* @map: regmap to the device
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* @regs: regulators for this device, VDD and IOVDD
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* @scale: the current scaling setting
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*/
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struct kxsd9_state {
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struct device *dev;
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struct regmap *map;
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struct regulator_bulk_data regs[2];
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u8 scale;
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};
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#define KXSD9_SCALE_2G "0.011978"
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@ -111,6 +114,10 @@ static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro)
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i);
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if (ret < 0)
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goto error_ret;
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/* Cached scale when the sensor is powered down */
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st->scale = i;
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error_ret:
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return ret;
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}
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@ -133,6 +140,9 @@ static int kxsd9_write_raw(struct iio_dev *indio_dev,
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long mask)
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{
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int ret = -EINVAL;
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struct kxsd9_state *st = iio_priv(indio_dev);
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pm_runtime_get_sync(st->dev);
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if (mask == IIO_CHAN_INFO_SCALE) {
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/* Check no integer component */
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@ -141,6 +151,9 @@ static int kxsd9_write_raw(struct iio_dev *indio_dev,
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ret = kxsd9_write_scale(indio_dev, val2);
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}
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pm_runtime_mark_last_busy(st->dev);
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pm_runtime_put_autosuspend(st->dev);
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return ret;
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}
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@ -154,6 +167,8 @@ static int kxsd9_read_raw(struct iio_dev *indio_dev,
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__be16 raw_val;
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u16 nval;
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pm_runtime_get_sync(st->dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = regmap_bulk_read(st->map, chan->address, &raw_val,
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@ -184,6 +199,9 @@ static int kxsd9_read_raw(struct iio_dev *indio_dev,
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}
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error_ret:
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pm_runtime_mark_last_busy(st->dev);
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pm_runtime_put_autosuspend(st->dev);
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return ret;
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};
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@ -214,6 +232,32 @@ static irqreturn_t kxsd9_trigger_handler(int irq, void *p)
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return IRQ_HANDLED;
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}
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static int kxsd9_buffer_preenable(struct iio_dev *indio_dev)
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{
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struct kxsd9_state *st = iio_priv(indio_dev);
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pm_runtime_get_sync(st->dev);
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return 0;
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}
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static int kxsd9_buffer_postdisable(struct iio_dev *indio_dev)
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{
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struct kxsd9_state *st = iio_priv(indio_dev);
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pm_runtime_mark_last_busy(st->dev);
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pm_runtime_put_autosuspend(st->dev);
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return 0;
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}
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static const struct iio_buffer_setup_ops kxsd9_buffer_setup_ops = {
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.preenable = kxsd9_buffer_preenable,
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.postenable = iio_triggered_buffer_postenable,
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.predisable = iio_triggered_buffer_predisable,
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.postdisable = kxsd9_buffer_postdisable,
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};
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#define KXSD9_ACCEL_CHAN(axis, index) \
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{ \
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.type = IIO_ACCEL, \
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@ -285,7 +329,7 @@ static int kxsd9_power_up(struct kxsd9_state *st)
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KXSD9_CTRL_C_LP_1000HZ |
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KXSD9_CTRL_C_MOT_LEV |
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KXSD9_CTRL_C_MOT_LAT |
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KXSD9_CTRL_C_FS_2G);
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st->scale);
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if (ret)
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return ret;
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@ -369,13 +413,15 @@ int kxsd9_common_probe(struct device *dev,
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dev_err(dev, "Cannot get regulators\n");
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return ret;
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}
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/* Default scaling */
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st->scale = KXSD9_CTRL_C_FS_2G;
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kxsd9_power_up(st);
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ret = iio_triggered_buffer_setup(indio_dev,
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iio_pollfunc_store_time,
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kxsd9_trigger_handler,
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NULL);
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&kxsd9_buffer_setup_ops);
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if (ret) {
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dev_err(dev, "triggered buffer setup failed\n");
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goto err_power_down;
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@ -387,6 +433,19 @@ int kxsd9_common_probe(struct device *dev,
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dev_set_drvdata(dev, indio_dev);
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/* Enable runtime PM */
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pm_runtime_get_noresume(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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/*
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* Set autosuspend to two orders of magnitude larger than the
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* start-up time. 20ms start-up time means 2000ms autosuspend,
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* i.e. 2 seconds.
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*/
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pm_runtime_set_autosuspend_delay(dev, 2000);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_put(dev);
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return 0;
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err_cleanup_buffer:
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@ -405,12 +464,41 @@ int kxsd9_common_remove(struct device *dev)
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iio_triggered_buffer_cleanup(indio_dev);
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iio_device_unregister(indio_dev);
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pm_runtime_get_sync(dev);
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pm_runtime_put_noidle(dev);
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pm_runtime_disable(dev);
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kxsd9_power_down(st);
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return 0;
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}
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EXPORT_SYMBOL(kxsd9_common_remove);
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#ifdef CONFIG_PM
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static int kxsd9_runtime_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct kxsd9_state *st = iio_priv(indio_dev);
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return kxsd9_power_down(st);
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}
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static int kxsd9_runtime_resume(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct kxsd9_state *st = iio_priv(indio_dev);
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return kxsd9_power_up(st);
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}
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#endif /* CONFIG_PM */
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const struct dev_pm_ops kxsd9_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
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pm_runtime_force_resume)
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SET_RUNTIME_PM_OPS(kxsd9_runtime_suspend,
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kxsd9_runtime_resume, NULL)
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};
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EXPORT_SYMBOL(kxsd9_dev_pm_ops);
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MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
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MODULE_DESCRIPTION("Kionix KXSD9 driver");
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MODULE_LICENSE("GPL v2");
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@ -8,3 +8,5 @@ int kxsd9_common_probe(struct device *dev,
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struct regmap *map,
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const char *name);
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int kxsd9_common_remove(struct device *dev);
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extern const struct dev_pm_ops kxsd9_dev_pm_ops;
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