124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/i2c-mux.h>
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#include <linux/iio/iio.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/pm_runtime.h>
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#include "mpu3050.h"
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static const struct regmap_config mpu3050_i2c_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int mpu3050_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
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{
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struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
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/* Just power up the device, that is all that is needed */
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pm_runtime_get_sync(mpu3050->dev);
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return 0;
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}
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static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
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{
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struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
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pm_runtime_mark_last_busy(mpu3050->dev);
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pm_runtime_put_autosuspend(mpu3050->dev);
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return 0;
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}
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static int mpu3050_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct regmap *regmap;
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const char *name;
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struct mpu3050 *mpu3050;
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_I2C_BLOCK))
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return -EOPNOTSUPP;
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if (id)
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name = id->name;
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else
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return -ENODEV;
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regmap = devm_regmap_init_i2c(client, &mpu3050_i2c_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&client->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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ret = mpu3050_common_probe(&client->dev, regmap, client->irq, name);
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if (ret)
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return ret;
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/* The main driver is up, now register the I2C mux */
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mpu3050 = iio_priv(dev_get_drvdata(&client->dev));
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mpu3050->i2cmux = i2c_mux_alloc(client->adapter, &client->dev,
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1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
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mpu3050_i2c_bypass_select,
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mpu3050_i2c_bypass_deselect);
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/* Just fail the mux, there is no point in killing the driver */
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if (!mpu3050->i2cmux)
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dev_err(&client->dev, "failed to allocate I2C mux\n");
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else {
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mpu3050->i2cmux->priv = mpu3050;
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/* Ignore failure, not critical */
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i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0, 0);
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}
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return 0;
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}
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static int mpu3050_i2c_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
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struct mpu3050 *mpu3050 = iio_priv(indio_dev);
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if (mpu3050->i2cmux)
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i2c_mux_del_adapters(mpu3050->i2cmux);
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return mpu3050_common_remove(&client->dev);
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}
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/*
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* device id table is used to identify what device can be
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* supported by this driver
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*/
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static const struct i2c_device_id mpu3050_i2c_id[] = {
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{ "mpu3050" },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mpu3050_i2c_id);
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static const struct of_device_id mpu3050_i2c_of_match[] = {
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{ .compatible = "invensense,mpu3050", .data = "mpu3050" },
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/* Deprecated vendor ID from the Input driver */
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{ .compatible = "invn,mpu3050", .data = "mpu3050" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, mpu3050_i2c_of_match);
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static struct i2c_driver mpu3050_i2c_driver = {
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.probe = mpu3050_i2c_probe,
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.remove = mpu3050_i2c_remove,
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.id_table = mpu3050_i2c_id,
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.driver = {
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.of_match_table = mpu3050_i2c_of_match,
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.name = "mpu3050-i2c",
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.pm = &mpu3050_dev_pm_ops,
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},
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};
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module_i2c_driver(mpu3050_i2c_driver);
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MODULE_AUTHOR("Linus Walleij");
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MODULE_DESCRIPTION("Invensense MPU3050 gyroscope driver");
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MODULE_LICENSE("GPL");
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