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 <linux/property.h>
  14 #include "inv_mpu_iio.h"
  15
  16 static const struct regmap_config inv_mpu_regmap_config = {
  17         .reg_bits = 8,
  18         .val_bits = 8,
  19 };
  20
  21 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
  22 {
  23         return 0;
  24 }
  25
  26 static bool inv_mpu_i2c_aux_bus(struct device *dev)
  27 {
  28         struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));
  29
  30         switch (st->chip_type) {
  31         case INV_ICM20608:
  32         case INV_ICM20609:
  33         case INV_ICM20689:
  34         case INV_ICM20602:
  35         case INV_IAM20680:
  36                 /* no i2c auxiliary bus on the chip */
  37                 return false;
  38         case INV_MPU9150:
  39         case INV_MPU9250:
  40         case INV_MPU9255:
  41                 if (st->magn_disabled)
  42                         return true;
  43                 else
  44                         return false;
  45         default:
  46                 return true;
  47         }
  48 }
  49
  50 static int inv_mpu_i2c_aux_setup(struct iio_dev *indio_dev)
  51 {
  52         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  53         struct device *dev = indio_dev->dev.parent;
  54         struct device_node *mux_node;
  55         int ret;
  56
  57         /*
  58          * MPU9xxx magnetometer support requires to disable i2c auxiliary bus.
  59          * To ensure backward compatibility with existing setups, do not disable
  60          * i2c auxiliary bus if it used.
  61          * Check for i2c-gate node in devicetree and set magnetometer disabled.
  62          * Only MPU6500 is supported by ACPI, no need to check.
  63          */
  64         switch (st->chip_type) {
  65         case INV_MPU9150:
  66         case INV_MPU9250:
  67         case INV_MPU9255:
  68                 mux_node = of_get_child_by_name(dev->of_node, "i2c-gate");
  69                 if (mux_node != NULL) {
  70                         st->magn_disabled = true;
  71                         dev_warn(dev, "disable internal use of magnetometer\n");
  72                 }
  73                 of_node_put(mux_node);
  74                 break;
  75         default:
  76                 break;
  77         }
  78
  79         /* enable i2c bypass when using i2c auxiliary bus */
  80         if (inv_mpu_i2c_aux_bus(dev)) {
  81                 ret = regmap_write(st->map, st->reg->int_pin_cfg,
  82                                    st->irq_mask | INV_MPU6050_BIT_BYPASS_EN);
  83                 if (ret)
  84                         return ret;
  85         }
  86
  87         return 0;
  88 }
  89
  90 /**
  91  *  inv_mpu_probe() - probe function.
  92  *  @client:          i2c client.
  93  *  @id:              i2c device id.
  94  *
  95  *  Returns 0 on success, a negative error code otherwise.
  96  */
  97 static int inv_mpu_probe(struct i2c_client *client,
  98                          const struct i2c_device_id *id)
  99 {
 100         const void *match;
 101         struct inv_mpu6050_state *st;
 102         int result;
 103         enum inv_devices chip_type;
 104         struct regmap *regmap;
 105         const char *name;
 106
 107         if (!i2c_check_functionality(client->adapter,
 108                                      I2C_FUNC_SMBUS_I2C_BLOCK))
 109                 return -EOPNOTSUPP;
 110
 111         match = device_get_match_data(&client->dev);
 112         if (match) {
 113                 chip_type = (enum inv_devices)match;
 114                 name = client->name;
 115         } else if (id) {
 116                 chip_type = (enum inv_devices)
 117                         id->driver_data;
 118                 name = id->name;
 119         } else {
 120                 return -ENOSYS;
 121         }
 122
 123         regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
 124         if (IS_ERR(regmap)) {
 125                 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
 126                         (int)PTR_ERR(regmap));
 127                 return PTR_ERR(regmap);
 128         }
 129
 130         result = inv_mpu_core_probe(regmap, client->irq, name,
 131                                     inv_mpu_i2c_aux_setup, chip_type);
 132         if (result < 0)
 133                 return result;
 134
 135         st = iio_priv(dev_get_drvdata(&client->dev));
 136         if (inv_mpu_i2c_aux_bus(&client->dev)) {
 137                 /* declare i2c auxiliary bus */
 138                 st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
 139                                          1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
 140                                          inv_mpu6050_select_bypass, NULL);
 141                 if (!st->muxc)
 142                         return -ENOMEM;
 143                 st->muxc->priv = dev_get_drvdata(&client->dev);
 144                 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
 145                 if (result)
 146                         return result;
 147                 result = inv_mpu_acpi_create_mux_client(client);
 148                 if (result)
 149                         goto out_del_mux;
 150         }
 151
 152         return 0;
 153
 154 out_del_mux:
 155         i2c_mux_del_adapters(st->muxc);
 156         return result;
 157 }
 158
 159 static int inv_mpu_remove(struct i2c_client *client)
 160 {
 161         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 162         struct inv_mpu6050_state *st = iio_priv(indio_dev);
 163
 164         if (st->muxc) {
 165                 inv_mpu_acpi_delete_mux_client(client);
 166                 i2c_mux_del_adapters(st->muxc);
 167         }
 168
 169         return 0;
 170 }
 171
 172 /*
 173  * device id table is used to identify what device can be
 174  * supported by this driver
 175  */
 176 static const struct i2c_device_id inv_mpu_id[] = {
 177         {"mpu6050", INV_MPU6050},
 178         {"mpu6500", INV_MPU6500},
 179         {"mpu6515", INV_MPU6515},
 180         {"mpu9150", INV_MPU9150},
 181         {"mpu9250", INV_MPU9250},
 182         {"mpu9255", INV_MPU9255},
 183         {"icm20608", INV_ICM20608},
 184         {"icm20609", INV_ICM20609},
 185         {"icm20689", INV_ICM20689},
 186         {"icm20602", INV_ICM20602},
 187         {"icm20690", INV_ICM20690},
 188         {"iam20680", INV_IAM20680},
 189         {}
 190 };
 191
 192 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
 193
 194 static const struct of_device_id inv_of_match[] = {
 195         {
 196                 .compatible = "invensense,mpu6050",
 197                 .data = (void *)INV_MPU6050
 198         },
 199         {
 200                 .compatible = "invensense,mpu6500",
 201                 .data = (void *)INV_MPU6500
 202         },
 203         {
 204                 .compatible = "invensense,mpu6515",
 205                 .data = (void *)INV_MPU6515
 206         },
 207         {
 208                 .compatible = "invensense,mpu9150",
 209                 .data = (void *)INV_MPU9150
 210         },
 211         {
 212                 .compatible = "invensense,mpu9250",
 213                 .data = (void *)INV_MPU9250
 214         },
 215         {
 216                 .compatible = "invensense,mpu9255",
 217                 .data = (void *)INV_MPU9255
 218         },
 219         {
 220                 .compatible = "invensense,icm20608",
 221                 .data = (void *)INV_ICM20608
 222         },
 223         {
 224                 .compatible = "invensense,icm20609",
 225                 .data = (void *)INV_ICM20609
 226         },
 227         {
 228                 .compatible = "invensense,icm20689",
 229                 .data = (void *)INV_ICM20689
 230         },
 231         {
 232                 .compatible = "invensense,icm20602",
 233                 .data = (void *)INV_ICM20602
 234         },
 235         {
 236                 .compatible = "invensense,icm20690",
 237                 .data = (void *)INV_ICM20690
 238         },
 239         {
 240                 .compatible = "invensense,iam20680",
 241                 .data = (void *)INV_IAM20680
 242         },
 243         { }
 244 };
 245 MODULE_DEVICE_TABLE(of, inv_of_match);
 246
 247 static const struct acpi_device_id inv_acpi_match[] = {
 248         {"INVN6500", INV_MPU6500},
 249         { },
 250 };
 251
 252 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
 253
 254 static struct i2c_driver inv_mpu_driver = {
 255         .probe          =       inv_mpu_probe,
 256         .remove         =       inv_mpu_remove,
 257         .id_table       =       inv_mpu_id,
 258         .driver = {
 259                 .of_match_table = inv_of_match,
 260                 .acpi_match_table = ACPI_PTR(inv_acpi_match),
 261                 .name   =       "inv-mpu6050-i2c",
 262                 .pm     =       &inv_mpu_pmops,
 263         },
 264 };
 265
 266 module_i2c_driver(inv_mpu_driver);
 267
 268 MODULE_AUTHOR("Invensense Corporation");
 269 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
 270 MODULE_LICENSE("GPL");