drivers/iio/gyro/mpu3050-i2c.c

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