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linux-next/drivers/iio/accel/kxsd9-i2c.c
Linus Walleij 9a9a369d61 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>
2016-09-18 11:35:59 +01:00

65 lines
1.3 KiB
C

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include "kxsd9.h"
static int kxsd9_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
static const struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x0e,
};
struct regmap *regmap;
regmap = devm_regmap_init_i2c(i2c, &config);
if (IS_ERR(regmap)) {
dev_err(&i2c->dev, "Failed to register i2c regmap %d\n",
(int)PTR_ERR(regmap));
return PTR_ERR(regmap);
}
return kxsd9_common_probe(&i2c->dev,
regmap,
i2c->name);
}
static int kxsd9_i2c_remove(struct i2c_client *client)
{
return kxsd9_common_remove(&client->dev);
}
#ifdef CONFIG_OF
static const struct of_device_id kxsd9_of_match[] = {
{ .compatible = "kionix,kxsd9", },
{ },
};
MODULE_DEVICE_TABLE(of, kxsd9_of_match);
#else
#define kxsd9_of_match NULL
#endif
static const struct i2c_device_id kxsd9_i2c_id[] = {
{"kxsd9", 0},
{ },
};
MODULE_DEVICE_TABLE(i2c, kxsd9_i2c_id);
static struct i2c_driver kxsd9_i2c_driver = {
.driver = {
.name = "kxsd9",
.of_match_table = of_match_ptr(kxsd9_of_match),
.pm = &kxsd9_dev_pm_ops,
},
.probe = kxsd9_i2c_probe,
.remove = kxsd9_i2c_remove,
.id_table = kxsd9_i2c_id,
};
module_i2c_driver(kxsd9_i2c_driver);