Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | /*
* Copyright (C) 2012 Invensense, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/module.h>
#include "inv_mpu_iio.h"
static const struct regmap_config inv_mpu_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
{
struct iio_dev *indio_dev = i2c_mux_priv(muxc);
struct inv_mpu6050_state *st = iio_priv(indio_dev);
int ret = 0;
/* Use the same mutex which was used everywhere to protect power-op */
mutex_lock(&indio_dev->mlock);
if (!st->powerup_count) {
ret = regmap_write(st->map, st->reg->pwr_mgmt_1, 0);
if (ret)
goto write_error;
usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
INV_MPU6050_REG_UP_TIME_MAX);
}
if (!ret) {
st->powerup_count++;
ret = regmap_write(st->map, st->reg->int_pin_cfg,
INV_MPU6050_INT_PIN_CFG |
INV_MPU6050_BIT_BYPASS_EN);
}
write_error:
mutex_unlock(&indio_dev->mlock);
return ret;
}
static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id)
{
struct iio_dev *indio_dev = i2c_mux_priv(muxc);
struct inv_mpu6050_state *st = iio_priv(indio_dev);
mutex_lock(&indio_dev->mlock);
/* It doesn't really mattter, if any of the calls fails */
regmap_write(st->map, st->reg->int_pin_cfg, INV_MPU6050_INT_PIN_CFG);
st->powerup_count--;
if (!st->powerup_count)
regmap_write(st->map, st->reg->pwr_mgmt_1,
INV_MPU6050_BIT_SLEEP);
mutex_unlock(&indio_dev->mlock);
return 0;
}
static const char *inv_mpu_match_acpi_device(struct device *dev, int *chip_id)
{
const struct acpi_device_id *id;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return NULL;
*chip_id = (int)id->driver_data;
return dev_name(dev);
}
/**
* inv_mpu_probe() - probe function.
* @client: i2c client.
* @id: i2c device id.
*
* Returns 0 on success, a negative error code otherwise.
*/
static int inv_mpu_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct inv_mpu6050_state *st;
int result, chip_type;
struct regmap *regmap;
const char *name;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_I2C_BLOCK))
return -EOPNOTSUPP;
if (id) {
chip_type = (int)id->driver_data;
name = id->name;
} else if (ACPI_HANDLE(&client->dev)) {
name = inv_mpu_match_acpi_device(&client->dev, &chip_type);
if (!name)
return -ENODEV;
} else {
return -ENOSYS;
}
regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Failed to register i2c regmap %d\n",
(int)PTR_ERR(regmap));
return PTR_ERR(regmap);
}
result = inv_mpu_core_probe(regmap, client->irq, name,
NULL, chip_type);
if (result < 0)
return result;
st = iio_priv(dev_get_drvdata(&client->dev));
st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
inv_mpu6050_select_bypass,
inv_mpu6050_deselect_bypass);
if (!st->muxc) {
result = -ENOMEM;
goto out_unreg_device;
}
st->muxc->priv = dev_get_drvdata(&client->dev);
result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
if (result)
goto out_unreg_device;
result = inv_mpu_acpi_create_mux_client(client);
if (result)
goto out_del_mux;
return 0;
out_del_mux:
i2c_mux_del_adapters(st->muxc);
out_unreg_device:
inv_mpu_core_remove(&client->dev);
return result;
}
static int inv_mpu_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct inv_mpu6050_state *st = iio_priv(indio_dev);
inv_mpu_acpi_delete_mux_client(client);
i2c_mux_del_adapters(st->muxc);
return inv_mpu_core_remove(&client->dev);
}
/*
* device id table is used to identify what device can be
* supported by this driver
*/
static const struct i2c_device_id inv_mpu_id[] = {
{"mpu6050", INV_MPU6050},
{"mpu6500", INV_MPU6500},
{"mpu9150", INV_MPU9150},
{"icm20608", INV_ICM20608},
{}
};
MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
static const struct acpi_device_id inv_acpi_match[] = {
{"INVN6500", INV_MPU6500},
{ },
};
MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
static struct i2c_driver inv_mpu_driver = {
.probe = inv_mpu_probe,
.remove = inv_mpu_remove,
.id_table = inv_mpu_id,
.driver = {
.acpi_match_table = ACPI_PTR(inv_acpi_match),
.name = "inv-mpu6050-i2c",
.pm = &inv_mpu_pmops,
},
};
module_i2c_driver(inv_mpu_driver);
MODULE_AUTHOR("Invensense Corporation");
MODULE_DESCRIPTION("Invensense device MPU6050 driver");
MODULE_LICENSE("GPL");
|