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