9a9a369d61
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>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "kxsd9.h"
|
|
|
|
static int kxsd9_spi_probe(struct spi_device *spi)
|
|
{
|
|
static const struct regmap_config config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = 0x0e,
|
|
};
|
|
struct regmap *regmap;
|
|
|
|
spi->mode = SPI_MODE_0;
|
|
regmap = devm_regmap_init_spi(spi, &config);
|
|
if (IS_ERR(regmap)) {
|
|
dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
|
|
__func__, PTR_ERR(regmap));
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
return kxsd9_common_probe(&spi->dev,
|
|
regmap,
|
|
spi_get_device_id(spi)->name);
|
|
}
|
|
|
|
static int kxsd9_spi_remove(struct spi_device *spi)
|
|
{
|
|
return kxsd9_common_remove(&spi->dev);
|
|
}
|
|
|
|
static const struct spi_device_id kxsd9_spi_id[] = {
|
|
{"kxsd9", 0},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, kxsd9_spi_id);
|
|
|
|
static struct spi_driver kxsd9_spi_driver = {
|
|
.driver = {
|
|
.name = "kxsd9",
|
|
.pm = &kxsd9_dev_pm_ops,
|
|
},
|
|
.probe = kxsd9_spi_probe,
|
|
.remove = kxsd9_spi_remove,
|
|
.id_table = kxsd9_spi_id,
|
|
};
|
|
module_spi_driver(kxsd9_spi_driver);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
|
MODULE_DESCRIPTION("Kionix KXSD9 SPI driver");
|
|
MODULE_LICENSE("GPL v2");
|