drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3 * Copyright (C) 2012 Invensense, Inc.
   4 */
   5
   6 #include <linux/acpi.h>
   7 #include <linux/delay.h>
   8 #include <linux/err.h>
   9 #include <linux/i2c.h>
  10 #include <linux/iio/iio.h>
  11 #include <linux/module.h>
  12 #include <linux/of_device.h>
  13 #include "inv_mpu_iio.h"
  14
  15 static const struct regmap_config inv_mpu_regmap_config = {
  16         .reg_bits = 8,
  17         .val_bits = 8,
  18 };
  19
  20 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
  21 {
  22         struct iio_dev *indio_dev = i2c_mux_priv(muxc);
  23         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  24         int ret;
  25
  26         mutex_lock(&st->lock);
  27
  28         ret = inv_mpu6050_set_power_itg(st, true);
  29         if (ret)
  30                 goto error_unlock;
  31
  32         ret = regmap_write(st->map, st->reg->int_pin_cfg,
  33                            st->irq_mask | INV_MPU6050_BIT_BYPASS_EN);
  34
  35 error_unlock:
  36         mutex_unlock(&st->lock);
  37
  38         return ret;
  39 }
  40
  41 static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id)
  42 {
  43         struct iio_dev *indio_dev = i2c_mux_priv(muxc);
  44         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  45
  46         mutex_lock(&st->lock);
  47
  48         /* It doesn't really matter if any of the calls fail */
  49         regmap_write(st->map, st->reg->int_pin_cfg, st->irq_mask);
  50         inv_mpu6050_set_power_itg(st, false);
  51
  52         mutex_unlock(&st->lock);
  53
  54         return 0;
  55 }
  56
  57 static const char *inv_mpu_match_acpi_device(struct device *dev,
  58                                              enum inv_devices *chip_id)
  59 {
  60         const struct acpi_device_id *id;
  61
  62         id = acpi_match_device(dev->driver->acpi_match_table, dev);
  63         if (!id)
  64                 return NULL;
  65
  66         *chip_id = (int)id->driver_data;
  67
  68         return dev_name(dev);
  69 }
  70
  71 static bool inv_mpu_i2c_aux_bus(struct device *dev)
  72 {
  73         struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));
  74
  75         switch (st->chip_type) {
  76         case INV_ICM20608:
  77         case INV_ICM20602:
  78                 /* no i2c auxiliary bus on the chip */
  79                 return false;
  80         case INV_MPU9150:
  81         case INV_MPU9250:
  82         case INV_MPU9255:
  83                 if (st->magn_disabled)
  84                         return true;
  85                 else
  86                         return false;
  87         default:
  88                 return true;
  89         }
  90 }
  91
  92 /*
  93  * MPU9xxx magnetometer support requires to disable i2c auxiliary bus support.
  94  * To ensure backward compatibility with existing setups, do not disable
  95  * i2c auxiliary bus if it used.
  96  * Check for i2c-gate node in devicetree and set magnetometer disabled.
  97  * Only MPU6500 is supported by ACPI, no need to check.
  98  */
  99 static int inv_mpu_magn_disable(struct iio_dev *indio_dev)
 100 {
 101         struct inv_mpu6050_state *st = iio_priv(indio_dev);
 102         struct device *dev = indio_dev->dev.parent;
 103         struct device_node *mux_node;
 104
 105         switch (st->chip_type) {
 106         case INV_MPU9150:
 107         case INV_MPU9250:
 108         case INV_MPU9255:
 109                 mux_node = of_get_child_by_name(dev->of_node, "i2c-gate");
 110                 if (mux_node != NULL) {
 111                         st->magn_disabled = true;
 112                         dev_warn(dev, "disable internal use of magnetometer\n");
 113                 }
 114                 of_node_put(mux_node);
 115                 break;
 116         default:
 117                 break;
 118         }
 119
 120         return 0;
 121 }
 122
 123 /**
 124  *  inv_mpu_probe() - probe function.
 125  *  @client:          i2c client.
 126  *  @id:              i2c device id.
 127  *
 128  *  Returns 0 on success, a negative error code otherwise.
 129  */
 130 static int inv_mpu_probe(struct i2c_client *client,
 131                          const struct i2c_device_id *id)
 132 {
 133         struct inv_mpu6050_state *st;
 134         int result;
 135         enum inv_devices chip_type;
 136         struct regmap *regmap;
 137         const char *name;
 138
 139         if (!i2c_check_functionality(client->adapter,
 140                                      I2C_FUNC_SMBUS_I2C_BLOCK))
 141                 return -EOPNOTSUPP;
 142
 143         if (client->dev.of_node) {
 144                 chip_type = (enum inv_devices)
 145                         of_device_get_match_data(&client->dev);
 146                 name = client->name;
 147         } else if (id) {
 148                 chip_type = (enum inv_devices)
 149                         id->driver_data;
 150                 name = id->name;
 151         } else if (ACPI_HANDLE(&client->dev)) {
 152                 name = inv_mpu_match_acpi_device(&client->dev, &chip_type);
 153                 if (!name)
 154                         return -ENODEV;
 155         } else {
 156                 return -ENOSYS;
 157         }
 158
 159         regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
 160         if (IS_ERR(regmap)) {
 161                 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
 162                         (int)PTR_ERR(regmap));
 163                 return PTR_ERR(regmap);
 164         }
 165
 166         result = inv_mpu_core_probe(regmap, client->irq, name,
 167                                     inv_mpu_magn_disable, chip_type);
 168         if (result < 0)
 169                 return result;
 170
 171         st = iio_priv(dev_get_drvdata(&client->dev));
 172         if (inv_mpu_i2c_aux_bus(&client->dev)) {
 173                 /* declare i2c auxiliary bus */
 174                 st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
 175                                          1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
 176                                          inv_mpu6050_select_bypass,
 177                                          inv_mpu6050_deselect_bypass);
 178                 if (!st->muxc)
 179                         return -ENOMEM;
 180                 st->muxc->priv = dev_get_drvdata(&client->dev);
 181                 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
 182                 if (result)
 183                         return result;
 184                 result = inv_mpu_acpi_create_mux_client(client);
 185                 if (result)
 186                         goto out_del_mux;
 187         }
 188
 189         return 0;
 190
 191 out_del_mux:
 192         i2c_mux_del_adapters(st->muxc);
 193         return result;
 194 }
 195
 196 static int inv_mpu_remove(struct i2c_client *client)
 197 {
 198         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 199         struct inv_mpu6050_state *st = iio_priv(indio_dev);
 200
 201         if (st->muxc) {
 202                 inv_mpu_acpi_delete_mux_client(client);
 203                 i2c_mux_del_adapters(st->muxc);
 204         }
 205
 206         return 0;
 207 }
 208
 209 /*
 210  * device id table is used to identify what device can be
 211  * supported by this driver
 212  */
 213 static const struct i2c_device_id inv_mpu_id[] = {
 214         {"mpu6050", INV_MPU6050},
 215         {"mpu6500", INV_MPU6500},
 216         {"mpu6515", INV_MPU6515},
 217         {"mpu9150", INV_MPU9150},
 218         {"mpu9250", INV_MPU9250},
 219         {"mpu9255", INV_MPU9255},
 220         {"icm20608", INV_ICM20608},
 221         {"icm20602", INV_ICM20602},
 222         {}
 223 };
 224
 225 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
 226
 227 static const struct of_device_id inv_of_match[] = {
 228         {
 229                 .compatible = "invensense,mpu6050",
 230                 .data = (void *)INV_MPU6050
 231         },
 232         {
 233                 .compatible = "invensense,mpu6500",
 234                 .data = (void *)INV_MPU6500
 235         },
 236         {
 237                 .compatible = "invensense,mpu6515",
 238                 .data = (void *)INV_MPU6515
 239         },
 240         {
 241                 .compatible = "invensense,mpu9150",
 242                 .data = (void *)INV_MPU9150
 243         },
 244         {
 245                 .compatible = "invensense,mpu9250",
 246                 .data = (void *)INV_MPU9250
 247         },
 248         {
 249                 .compatible = "invensense,mpu9255",
 250                 .data = (void *)INV_MPU9255
 251         },
 252         {
 253                 .compatible = "invensense,icm20608",
 254                 .data = (void *)INV_ICM20608
 255         },
 256         {
 257                 .compatible = "invensense,icm20602",
 258                 .data = (void *)INV_ICM20602
 259         },
 260         { }
 261 };
 262 MODULE_DEVICE_TABLE(of, inv_of_match);
 263
 264 static const struct acpi_device_id inv_acpi_match[] = {
 265         {"INVN6500", INV_MPU6500},
 266         { },
 267 };
 268
 269 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
 270
 271 static struct i2c_driver inv_mpu_driver = {
 272         .probe          =       inv_mpu_probe,
 273         .remove         =       inv_mpu_remove,
 274         .id_table       =       inv_mpu_id,
 275         .driver = {
 276                 .of_match_table = inv_of_match,
 277                 .acpi_match_table = ACPI_PTR(inv_acpi_match),
 278                 .name   =       "inv-mpu6050-i2c",
 279                 .pm     =       &inv_mpu_pmops,
 280         },
 281 };
 282
 283 module_i2c_driver(inv_mpu_driver);
 284
 285 MODULE_AUTHOR("Invensense Corporation");
 286 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
 287 MODULE_LICENSE("GPL");