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/delay.h>
   7 #include <linux/err.h>
   8 #include <linux/i2c.h>
   9 #include <linux/iio/iio.h>
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/module.h>
  12 #include <linux/property.h>
  13
  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_ICM20608D:
  33         case INV_ICM20609:
  34         case INV_ICM20689:
  35         case INV_ICM20600:
  36         case INV_ICM20602:
  37         case INV_IAM20680:
  38                 /* no i2c auxiliary bus on the chip */
  39                 return false;
  40         case INV_MPU9150:
  41         case INV_MPU9250:
  42         case INV_MPU9255:
  43                 if (st->magn_disabled)
  44                         return true;
  45                 else
  46                         return false;
  47         default:
  48                 return true;
  49         }
  50 }
  51
  52 static int inv_mpu_i2c_aux_setup(struct iio_dev *indio_dev)
  53 {
  54         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  55         struct device *dev = indio_dev->dev.parent;
  56         struct fwnode_handle *mux_node;
  57         int ret;
  58
  59         /*
  60          * MPU9xxx magnetometer support requires to disable i2c auxiliary bus.
  61          * To ensure backward compatibility with existing setups, do not disable
  62          * i2c auxiliary bus if it used.
  63          * Check for i2c-gate node in devicetree and set magnetometer disabled.
  64          * Only MPU6500 is supported by ACPI, no need to check.
  65          */
  66         switch (st->chip_type) {
  67         case INV_MPU9150:
  68         case INV_MPU9250:
  69         case INV_MPU9255:
  70                 mux_node = device_get_named_child_node(dev, "i2c-gate");
  71                 if (mux_node != NULL) {
  72                         st->magn_disabled = true;
  73                         dev_warn(dev, "disable internal use of magnetometer\n");
  74                 }
  75                 fwnode_handle_put(mux_node);
  76                 break;
  77         default:
  78                 break;
  79         }
  80
  81         /* enable i2c bypass when using i2c auxiliary bus */
  82         if (inv_mpu_i2c_aux_bus(dev)) {
  83                 ret = regmap_write(st->map, st->reg->int_pin_cfg,
  84                                    st->irq_mask | INV_MPU6050_BIT_BYPASS_EN);
  85                 if (ret)
  86                         return ret;
  87         }
  88
  89         return 0;
  90 }
  91
  92 /**
  93  *  inv_mpu_probe() - probe function.
  94  *  @client:          i2c client.
  95  *
  96  *  Returns 0 on success, a negative error code otherwise.
  97  */
  98 static int inv_mpu_probe(struct i2c_client *client)
  99 {
 100         const struct i2c_device_id *id = i2c_client_get_device_id(client);
 101         const void *match;
 102         struct inv_mpu6050_state *st;
 103         int result;
 104         enum inv_devices chip_type;
 105         struct regmap *regmap;
 106         const char *name;
 107
 108         if (!i2c_check_functionality(client->adapter,
 109                                      I2C_FUNC_SMBUS_I2C_BLOCK))
 110                 return -EOPNOTSUPP;
 111
 112         match = device_get_match_data(&client->dev);
 113         if (match) {
 114                 chip_type = (uintptr_t)match;
 115                 name = client->name;
 116         } else if (id) {
 117                 chip_type = (enum inv_devices)
 118                         id->driver_data;
 119                 name = id->name;
 120         } else {
 121                 return -ENOSYS;
 122         }
 123
 124         regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
 125         if (IS_ERR(regmap)) {
 126                 dev_err(&client->dev, "Failed to register i2c regmap: %pe\n",
 127                         regmap);
 128                 return PTR_ERR(regmap);
 129         }
 130
 131         result = inv_mpu_core_probe(regmap, client->irq, name,
 132                                     inv_mpu_i2c_aux_setup, chip_type);
 133         if (result < 0)
 134                 return result;
 135
 136         st = iio_priv(dev_get_drvdata(&client->dev));
 137         if (inv_mpu_i2c_aux_bus(&client->dev)) {
 138                 /* declare i2c auxiliary bus */
 139                 st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
 140                                          1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
 141                                          inv_mpu6050_select_bypass, NULL);
 142                 if (!st->muxc)
 143                         return -ENOMEM;
 144                 st->muxc->priv = dev_get_drvdata(&client->dev);
 145                 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
 146                 if (result)
 147                         return result;
 148                 result = inv_mpu_acpi_create_mux_client(client);
 149                 if (result)
 150                         goto out_del_mux;
 151         }
 152
 153         return 0;
 154
 155 out_del_mux:
 156         i2c_mux_del_adapters(st->muxc);
 157         return result;
 158 }
 159
 160 static void inv_mpu_remove(struct i2c_client *client)
 161 {
 162         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 163         struct inv_mpu6050_state *st = iio_priv(indio_dev);
 164
 165         if (st->muxc) {
 166                 inv_mpu_acpi_delete_mux_client(client);
 167                 i2c_mux_del_adapters(st->muxc);
 168         }
 169 }
 170
 171 /*
 172  * device id table is used to identify what device can be
 173  * supported by this driver
 174  */
 175 static const struct i2c_device_id inv_mpu_id[] = {
 176         {"mpu6050", INV_MPU6050},
 177         {"mpu6500", INV_MPU6500},
 178         {"mpu6515", INV_MPU6515},
 179         {"mpu6880", INV_MPU6880},
 180         {"mpu9150", INV_MPU9150},
 181         {"mpu9250", INV_MPU9250},
 182         {"mpu9255", INV_MPU9255},
 183         {"icm20608", INV_ICM20608},
 184         {"icm20608d", INV_ICM20608D},
 185         {"icm20609", INV_ICM20609},
 186         {"icm20689", INV_ICM20689},
 187         {"icm20600", INV_ICM20600},
 188         {"icm20602", INV_ICM20602},
 189         {"icm20690", INV_ICM20690},
 190         {"iam20680", INV_IAM20680},
 191         {}
 192 };
 193
 194 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
 195
 196 static const struct of_device_id inv_of_match[] = {
 197         {
 198                 .compatible = "invensense,mpu6050",
 199                 .data = (void *)INV_MPU6050
 200         },
 201         {
 202                 .compatible = "invensense,mpu6500",
 203                 .data = (void *)INV_MPU6500
 204         },
 205         {
 206                 .compatible = "invensense,mpu6515",
 207                 .data = (void *)INV_MPU6515
 208         },
 209         {
 210                 .compatible = "invensense,mpu6880",
 211                 .data = (void *)INV_MPU6880
 212         },
 213         {
 214                 .compatible = "invensense,mpu9150",
 215                 .data = (void *)INV_MPU9150
 216         },
 217         {
 218                 .compatible = "invensense,mpu9250",
 219                 .data = (void *)INV_MPU9250
 220         },
 221         {
 222                 .compatible = "invensense,mpu9255",
 223                 .data = (void *)INV_MPU9255
 224         },
 225         {
 226                 .compatible = "invensense,icm20608",
 227                 .data = (void *)INV_ICM20608
 228         },
 229         {
 230                 .compatible = "invensense,icm20608d",
 231                 .data = (void *)INV_ICM20608D
 232         },
 233         {
 234                 .compatible = "invensense,icm20609",
 235                 .data = (void *)INV_ICM20609
 236         },
 237         {
 238                 .compatible = "invensense,icm20689",
 239                 .data = (void *)INV_ICM20689
 240         },
 241         {
 242                 .compatible = "invensense,icm20600",
 243                 .data = (void *)INV_ICM20600
 244         },
 245         {
 246                 .compatible = "invensense,icm20602",
 247                 .data = (void *)INV_ICM20602
 248         },
 249         {
 250                 .compatible = "invensense,icm20690",
 251                 .data = (void *)INV_ICM20690
 252         },
 253         {
 254                 .compatible = "invensense,iam20680",
 255                 .data = (void *)INV_IAM20680
 256         },
 257         { }
 258 };
 259 MODULE_DEVICE_TABLE(of, inv_of_match);
 260
 261 static const struct acpi_device_id inv_acpi_match[] = {
 262         {"INVN6500", INV_MPU6500},
 263         { },
 264 };
 265 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
 266
 267 static struct i2c_driver inv_mpu_driver = {
 268         .probe          =       inv_mpu_probe,
 269         .remove         =       inv_mpu_remove,
 270         .id_table       =       inv_mpu_id,
 271         .driver = {
 272                 .of_match_table = inv_of_match,
 273                 .acpi_match_table = inv_acpi_match,
 274                 .name   =       "inv-mpu6050-i2c",
 275                 .pm     =       pm_ptr(&inv_mpu_pmops),
 276         },
 277 };
 278
 279 module_i2c_driver(inv_mpu_driver);
 280
 281 MODULE_AUTHOR("Invensense Corporation");
 282 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
 283 MODULE_LICENSE("GPL");
 284 MODULE_IMPORT_NS(IIO_MPU6050);