iio: accel: kxsd9: Deploy system and runtime PM

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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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This commit is contained in:

Linus Walleij 2016-09-01 11:44:48 +02:00 • committed by Jonathan Cameron

parent 79383aaec4

commit 9a9a369d61

4 changed files with 94 additions and 2 deletions

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1

drivers/iio/accel/kxsd9-i2c.c

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drivers/iio/accel/kxsd9-spi.c

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92

drivers/iio/accel/kxsd9.c

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2

drivers/iio/accel/kxsd9.h

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