drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c

   1 /*
   2 * Copyright (C) 2015 Intel Corporation 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 #include <linux/module.h>
  14 #include <linux/acpi.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/regmap.h>
  17 #include <linux/iio/iio.h>
  18 #include "inv_mpu_iio.h"
  19
  20 static const struct regmap_config inv_mpu_regmap_config = {
  21         .reg_bits = 8,
  22         .val_bits = 8,
  23 };
  24
  25 static int inv_mpu_i2c_disable(struct iio_dev *indio_dev)
  26 {
  27         struct inv_mpu6050_state *st = iio_priv(indio_dev);
  28         int ret = 0;
  29
  30         ret = inv_mpu6050_set_power_itg(st, true);
  31         if (ret)
  32                 return ret;
  33
  34         ret = regmap_write(st->map, INV_MPU6050_REG_USER_CTRL,
  35                            INV_MPU6050_BIT_I2C_IF_DIS);
  36         if (ret) {
  37                 inv_mpu6050_set_power_itg(st, false);
  38                 return ret;
  39         }
  40
  41         return inv_mpu6050_set_power_itg(st, false);
  42 }
  43
  44 static int inv_mpu_probe(struct spi_device *spi)
  45 {
  46         struct regmap *regmap;
  47         const struct spi_device_id *id = spi_get_device_id(spi);
  48         const char *name = id ? id->name : NULL;
  49         const int chip_type = id ? id->driver_data : 0;
  50
  51         regmap = devm_regmap_init_spi(spi, &inv_mpu_regmap_config);
  52         if (IS_ERR(regmap)) {
  53                 dev_err(&spi->dev, "Failed to register spi regmap %d\n",
  54                         (int)PTR_ERR(regmap));
  55                 return PTR_ERR(regmap);
  56         }
  57
  58         return inv_mpu_core_probe(regmap, spi->irq, name,
  59                                   inv_mpu_i2c_disable, chip_type);
  60 }
  61
  62 static int inv_mpu_remove(struct spi_device *spi)
  63 {
  64         return inv_mpu_core_remove(&spi->dev);
  65 }
  66
  67 /*
  68  * device id table is used to identify what device can be
  69  * supported by this driver
  70  */
  71 static const struct spi_device_id inv_mpu_id[] = {
  72         {"mpu6000", INV_MPU6000},
  73         {}
  74 };
  75
  76 MODULE_DEVICE_TABLE(spi, inv_mpu_id);
  77
  78 static const struct acpi_device_id inv_acpi_match[] = {
  79         {"INVN6000", 0},
  80         { },
  81 };
  82 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
  83
  84 static struct spi_driver inv_mpu_driver = {
  85         .probe          =       inv_mpu_probe,
  86         .remove         =       inv_mpu_remove,
  87         .id_table       =       inv_mpu_id,
  88         .driver = {
  89                 .acpi_match_table = ACPI_PTR(inv_acpi_match),
  90                 .name   =       "inv-mpu6000-spi",
  91                 .pm     =       &inv_mpu_pmops,
  92         },
  93 };
  94
  95 module_spi_driver(inv_mpu_driver);
  96
  97 MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
  98 MODULE_DESCRIPTION("Invensense device MPU6000 driver");
  99 MODULE_LICENSE("GPL");