2 * Copyright (C) 2012 Invensense, Inc.
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.
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.
14 #include <linux/acpi.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/i2c-mux.h>
19 #include <linux/iio/iio.h>
20 #include <linux/module.h>
21 #include "inv_mpu_iio.h"
23 static const struct regmap_config inv_mpu_regmap_config = {
29 * The i2c read/write needs to happen in unlocked mode. As the parent
30 * adapter is common. If we use locked versions, it will fail as
31 * the mux adapter will lock the parent i2c adapter, while calling
32 * select/deselect functions.
34 static int inv_mpu6050_write_reg_unlocked(struct i2c_client *client,
39 struct i2c_msg msg[1] = {
48 ret = __i2c_transfer(client->adapter, msg, 1);
55 static int inv_mpu6050_select_bypass(struct i2c_adapter *adap, void *mux_priv,
58 struct i2c_client *client = mux_priv;
59 struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
60 struct inv_mpu6050_state *st = iio_priv(indio_dev);
63 /* Use the same mutex which was used everywhere to protect power-op */
64 mutex_lock(&indio_dev->mlock);
65 if (!st->powerup_count) {
66 ret = inv_mpu6050_write_reg_unlocked(client,
67 st->reg->pwr_mgmt_1, 0);
71 usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
72 INV_MPU6050_REG_UP_TIME_MAX);
76 ret = inv_mpu6050_write_reg_unlocked(client,
78 INV_MPU6050_INT_PIN_CFG |
79 INV_MPU6050_BIT_BYPASS_EN);
82 mutex_unlock(&indio_dev->mlock);
87 static int inv_mpu6050_deselect_bypass(struct i2c_adapter *adap,
88 void *mux_priv, u32 chan_id)
90 struct i2c_client *client = mux_priv;
91 struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
92 struct inv_mpu6050_state *st = iio_priv(indio_dev);
94 mutex_lock(&indio_dev->mlock);
95 /* It doesn't really mattter, if any of the calls fails */
96 inv_mpu6050_write_reg_unlocked(client, st->reg->int_pin_cfg,
97 INV_MPU6050_INT_PIN_CFG);
99 if (!st->powerup_count)
100 inv_mpu6050_write_reg_unlocked(client, st->reg->pwr_mgmt_1,
101 INV_MPU6050_BIT_SLEEP);
102 mutex_unlock(&indio_dev->mlock);
108 * inv_mpu_probe() - probe function.
109 * @client: i2c client.
110 * @id: i2c device id.
112 * Returns 0 on success, a negative error code otherwise.
114 static int inv_mpu_probe(struct i2c_client *client,
115 const struct i2c_device_id *id)
117 struct inv_mpu6050_state *st;
119 const char *name = id ? id->name : NULL;
120 struct regmap *regmap;
122 if (!i2c_check_functionality(client->adapter,
123 I2C_FUNC_SMBUS_I2C_BLOCK))
126 regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
127 if (IS_ERR(regmap)) {
128 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
129 (int)PTR_ERR(regmap));
130 return PTR_ERR(regmap);
133 result = inv_mpu_core_probe(regmap, client->irq, name,
134 NULL, id->driver_data);
138 st = iio_priv(dev_get_drvdata(&client->dev));
139 st->mux_adapter = i2c_add_mux_adapter(client->adapter,
143 inv_mpu6050_select_bypass,
144 inv_mpu6050_deselect_bypass);
145 if (!st->mux_adapter) {
147 goto out_unreg_device;
150 result = inv_mpu_acpi_create_mux_client(client);
157 i2c_del_mux_adapter(st->mux_adapter);
159 inv_mpu_core_remove(&client->dev);
163 static int inv_mpu_remove(struct i2c_client *client)
165 struct iio_dev *indio_dev = i2c_get_clientdata(client);
166 struct inv_mpu6050_state *st = iio_priv(indio_dev);
168 inv_mpu_acpi_delete_mux_client(client);
169 i2c_del_mux_adapter(st->mux_adapter);
171 return inv_mpu_core_remove(&client->dev);
175 * device id table is used to identify what device can be
176 * supported by this driver
178 static const struct i2c_device_id inv_mpu_id[] = {
179 {"mpu6050", INV_MPU6050},
180 {"mpu6500", INV_MPU6500},
184 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
186 static const struct acpi_device_id inv_acpi_match[] = {
191 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
193 static struct i2c_driver inv_mpu_driver = {
194 .probe = inv_mpu_probe,
195 .remove = inv_mpu_remove,
196 .id_table = inv_mpu_id,
198 .acpi_match_table = ACPI_PTR(inv_acpi_match),
199 .name = "inv-mpu6050-i2c",
200 .pm = &inv_mpu_pmops,
204 module_i2c_driver(inv_mpu_driver);
206 MODULE_AUTHOR("Invensense Corporation");
207 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
208 MODULE_LICENSE("GPL");