drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c

   1 /*
   2 * Copyright (C) 2012 Invensense, Inc.
   3 *
   4 * This software is licensed under the terms of the GNU General Public
   5 * License version 2, as published by the Free Software Foundation, and
   6 * may be copied, distributed, and modified under those terms.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 */
  13
  14 #include <linux/acpi.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/iio/iio.h>
  19 #include <linux/module.h>
  20 #include "inv_mpu_iio.h"
  21
  22 static const struct regmap_config inv_mpu_regmap_config = {
  23         .reg_bits = 8,
  24         .val_bits = 8,
  25 };
  26
  27 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
  28 {
  29         struct iio_dev *indio_dev = i2c_mux_priv(muxc);
  30         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  31         int ret = 0;
  32
  33         /* Use the same mutex which was used everywhere to protect power-op */
  34         mutex_lock(&indio_dev->mlock);
  35         if (!st->powerup_count) {
  36                 ret = regmap_write(st->map, st->reg->pwr_mgmt_1, 0);
  37                 if (ret)
  38                         goto write_error;
  39
  40                 usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
  41                              INV_MPU6050_REG_UP_TIME_MAX);
  42         }
  43         if (!ret) {
  44                 st->powerup_count++;
  45                 ret = regmap_write(st->map, st->reg->int_pin_cfg,
  46                                    INV_MPU6050_INT_PIN_CFG |
  47                                    INV_MPU6050_BIT_BYPASS_EN);
  48         }
  49 write_error:
  50         mutex_unlock(&indio_dev->mlock);
  51
  52         return ret;
  53 }
  54
  55 static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id)
  56 {
  57         struct iio_dev *indio_dev = i2c_mux_priv(muxc);
  58         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  59
  60         mutex_lock(&indio_dev->mlock);
  61         /* It doesn't really mattter, if any of the calls fails */
  62         regmap_write(st->map, st->reg->int_pin_cfg, INV_MPU6050_INT_PIN_CFG);
  63         st->powerup_count--;
  64         if (!st->powerup_count)
  65                 regmap_write(st->map, st->reg->pwr_mgmt_1,
  66                              INV_MPU6050_BIT_SLEEP);
  67         mutex_unlock(&indio_dev->mlock);
  68
  69         return 0;
  70 }
  71
  72 static const char *inv_mpu_match_acpi_device(struct device *dev, int *chip_id)
  73 {
  74         const struct acpi_device_id *id;
  75
  76         id = acpi_match_device(dev->driver->acpi_match_table, dev);
  77         if (!id)
  78                 return NULL;
  79
  80         *chip_id = (int)id->driver_data;
  81
  82         return dev_name(dev);
  83 }
  84
  85 /**
  86  *  inv_mpu_probe() - probe function.
  87  *  @client:          i2c client.
  88  *  @id:              i2c device id.
  89  *
  90  *  Returns 0 on success, a negative error code otherwise.
  91  */
  92 static int inv_mpu_probe(struct i2c_client *client,
  93                          const struct i2c_device_id *id)
  94 {
  95         struct inv_mpu6050_state *st;
  96         int result, chip_type;
  97         struct regmap *regmap;
  98         const char *name;
  99
 100         if (!i2c_check_functionality(client->adapter,
 101                                      I2C_FUNC_SMBUS_I2C_BLOCK))
 102                 return -EOPNOTSUPP;
 103
 104         if (id) {
 105                 chip_type = (int)id->driver_data;
 106                 name = id->name;
 107         } else if (ACPI_HANDLE(&client->dev)) {
 108                 name = inv_mpu_match_acpi_device(&client->dev, &chip_type);
 109                 if (!name)
 110                         return -ENODEV;
 111         } else {
 112                 return -ENOSYS;
 113         }
 114
 115         regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
 116         if (IS_ERR(regmap)) {
 117                 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
 118                         (int)PTR_ERR(regmap));
 119                 return PTR_ERR(regmap);
 120         }
 121
 122         result = inv_mpu_core_probe(regmap, client->irq, name,
 123                                     NULL, chip_type);
 124         if (result < 0)
 125                 return result;
 126
 127         st = iio_priv(dev_get_drvdata(&client->dev));
 128         st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
 129                                  1, 0, I2C_MUX_LOCKED,
 130                                  inv_mpu6050_select_bypass,
 131                                  inv_mpu6050_deselect_bypass);
 132         if (!st->muxc) {
 133                 result = -ENOMEM;
 134                 goto out_unreg_device;
 135         }
 136         st->muxc->priv = dev_get_drvdata(&client->dev);
 137         result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
 138         if (result)
 139                 goto out_unreg_device;
 140
 141         result = inv_mpu_acpi_create_mux_client(client);
 142         if (result)
 143                 goto out_del_mux;
 144
 145         return 0;
 146
 147 out_del_mux:
 148         i2c_mux_del_adapters(st->muxc);
 149 out_unreg_device:
 150         inv_mpu_core_remove(&client->dev);
 151         return result;
 152 }
 153
 154 static int inv_mpu_remove(struct i2c_client *client)
 155 {
 156         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 157         struct inv_mpu6050_state *st = iio_priv(indio_dev);
 158
 159         inv_mpu_acpi_delete_mux_client(client);
 160         i2c_mux_del_adapters(st->muxc);
 161
 162         return inv_mpu_core_remove(&client->dev);
 163 }
 164
 165 /*
 166  * device id table is used to identify what device can be
 167  * supported by this driver
 168  */
 169 static const struct i2c_device_id inv_mpu_id[] = {
 170         {"mpu6050", INV_MPU6050},
 171         {"mpu6500", INV_MPU6500},
 172         {"mpu9150", INV_MPU9150},
 173         {"icm20608", INV_ICM20608},
 174         {}
 175 };
 176
 177 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
 178
 179 static const struct acpi_device_id inv_acpi_match[] = {
 180         {"INVN6500", INV_MPU6500},
 181         { },
 182 };
 183
 184 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
 185
 186 static struct i2c_driver inv_mpu_driver = {
 187         .probe          =       inv_mpu_probe,
 188         .remove         =       inv_mpu_remove,
 189         .id_table       =       inv_mpu_id,
 190         .driver = {
 191                 .acpi_match_table = ACPI_PTR(inv_acpi_match),
 192                 .name   =       "inv-mpu6050-i2c",
 193                 .pm     =       &inv_mpu_pmops,
 194         },
 195 };
 196
 197 module_i2c_driver(inv_mpu_driver);
 198
 199 MODULE_AUTHOR("Invensense Corporation");
 200 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
 201 MODULE_LICENSE("GPL");