drivers/iio/gyro/mpu3050-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/err.h>
   3 #include <linux/i2c.h>
   4 #include <linux/i2c-mux.h>
   5 #include <linux/iio/iio.h>
   6 #include <linux/module.h>
   7 #include <linux/regmap.h>
   8 #include <linux/pm_runtime.h>
   9
  10 #include "mpu3050.h"
  11
  12 static const struct regmap_config mpu3050_i2c_regmap_config = {
  13         .reg_bits = 8,
  14         .val_bits = 8,
  15 };
  16
  17 static int mpu3050_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
  18 {
  19         struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
  20
  21         /* Just power up the device, that is all that is needed */
  22         pm_runtime_get_sync(mpu3050->dev);
  23         return 0;
  24 }
  25
  26 static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
  27 {
  28         struct mpu3050 *mpu3050 = i2c_mux_priv(mux);
  29
  30         pm_runtime_mark_last_busy(mpu3050->dev);
  31         pm_runtime_put_autosuspend(mpu3050->dev);
  32         return 0;
  33 }
  34
  35 static int mpu3050_i2c_probe(struct i2c_client *client)
  36 {
  37         const struct i2c_device_id *id = i2c_client_get_device_id(client);
  38         struct regmap *regmap;
  39         const char *name;
  40         struct mpu3050 *mpu3050;
  41         int ret;
  42
  43         if (!i2c_check_functionality(client->adapter,
  44                                      I2C_FUNC_SMBUS_I2C_BLOCK))
  45                 return -EOPNOTSUPP;
  46
  47         if (id)
  48                 name = id->name;
  49         else
  50                 return -ENODEV;
  51
  52         regmap = devm_regmap_init_i2c(client, &mpu3050_i2c_regmap_config);
  53         if (IS_ERR(regmap)) {
  54                 dev_err(&client->dev, "Failed to register i2c regmap: %pe\n",
  55                         regmap);
  56                 return PTR_ERR(regmap);
  57         }
  58
  59         ret = mpu3050_common_probe(&client->dev, regmap, client->irq, name);
  60         if (ret)
  61                 return ret;
  62
  63         /* The main driver is up, now register the I2C mux */
  64         mpu3050 = iio_priv(dev_get_drvdata(&client->dev));
  65         mpu3050->i2cmux = i2c_mux_alloc(client->adapter, &client->dev,
  66                                         1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
  67                                         mpu3050_i2c_bypass_select,
  68                                         mpu3050_i2c_bypass_deselect);
  69         /* Just fail the mux, there is no point in killing the driver */
  70         if (!mpu3050->i2cmux)
  71                 dev_err(&client->dev, "failed to allocate I2C mux\n");
  72         else {
  73                 mpu3050->i2cmux->priv = mpu3050;
  74                 /* Ignore failure, not critical */
  75                 i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0);
  76         }
  77
  78         return 0;
  79 }
  80
  81 static void mpu3050_i2c_remove(struct i2c_client *client)
  82 {
  83         struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
  84         struct mpu3050 *mpu3050 = iio_priv(indio_dev);
  85
  86         if (mpu3050->i2cmux)
  87                 i2c_mux_del_adapters(mpu3050->i2cmux);
  88
  89         mpu3050_common_remove(&client->dev);
  90 }
  91
  92 /*
  93  * device id table is used to identify what device can be
  94  * supported by this driver
  95  */
  96 static const struct i2c_device_id mpu3050_i2c_id[] = {
  97         { "mpu3050" },
  98         {}
  99 };
 100 MODULE_DEVICE_TABLE(i2c, mpu3050_i2c_id);
 101
 102 static const struct of_device_id mpu3050_i2c_of_match[] = {
 103         { .compatible = "invensense,mpu3050", .data = "mpu3050" },
 104         /* Deprecated vendor ID from the Input driver */
 105         { .compatible = "invn,mpu3050", .data = "mpu3050" },
 106         { },
 107 };
 108 MODULE_DEVICE_TABLE(of, mpu3050_i2c_of_match);
 109
 110 static struct i2c_driver mpu3050_i2c_driver = {
 111         .probe = mpu3050_i2c_probe,
 112         .remove = mpu3050_i2c_remove,
 113         .id_table = mpu3050_i2c_id,
 114         .driver = {
 115                 .of_match_table = mpu3050_i2c_of_match,
 116                 .name = "mpu3050-i2c",
 117                 .pm = pm_ptr(&mpu3050_dev_pm_ops),
 118         },
 119 };
 120 module_i2c_driver(mpu3050_i2c_driver);
 121
 122 MODULE_AUTHOR("Linus Walleij");
 123 MODULE_DESCRIPTION("Invensense MPU3050 gyroscope driver");
 124 MODULE_LICENSE("GPL");