Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Walleij | 3904b28 | 2016-10-25 16:15:54 +0200 | [diff] [blame] | 2 | #include <linux/err.h> |
| 3 | #include <linux/i2c.h> |
| 4 | #include <linux/i2c-mux.h> |
| 5 | #include <linux/iio/iio.h> |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/regmap.h> |
| 8 | #include <linux/pm_runtime.h> |
| 9 | |
| 10 | #include "mpu3050.h" |
| 11 | |
| 12 | static const struct regmap_config mpu3050_i2c_regmap_config = { |
| 13 | .reg_bits = 8, |
| 14 | .val_bits = 8, |
| 15 | }; |
| 16 | |
| 17 | static int mpu3050_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id) |
| 18 | { |
| 19 | struct mpu3050 *mpu3050 = i2c_mux_priv(mux); |
| 20 | |
| 21 | /* Just power up the device, that is all that is needed */ |
| 22 | pm_runtime_get_sync(mpu3050->dev); |
| 23 | return 0; |
| 24 | } |
| 25 | |
| 26 | static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id) |
| 27 | { |
| 28 | struct mpu3050 *mpu3050 = i2c_mux_priv(mux); |
| 29 | |
| 30 | pm_runtime_mark_last_busy(mpu3050->dev); |
| 31 | pm_runtime_put_autosuspend(mpu3050->dev); |
| 32 | return 0; |
| 33 | } |
| 34 | |
| 35 | static int mpu3050_i2c_probe(struct i2c_client *client, |
| 36 | const struct i2c_device_id *id) |
| 37 | { |
| 38 | struct regmap *regmap; |
| 39 | const char *name; |
| 40 | struct mpu3050 *mpu3050; |
| 41 | int ret; |
| 42 | |
| 43 | if (!i2c_check_functionality(client->adapter, |
| 44 | I2C_FUNC_SMBUS_I2C_BLOCK)) |
| 45 | return -EOPNOTSUPP; |
| 46 | |
| 47 | if (id) |
| 48 | name = id->name; |
| 49 | else |
| 50 | return -ENODEV; |
| 51 | |
| 52 | regmap = devm_regmap_init_i2c(client, &mpu3050_i2c_regmap_config); |
| 53 | if (IS_ERR(regmap)) { |
| 54 | dev_err(&client->dev, "Failed to register i2c regmap %d\n", |
| 55 | (int)PTR_ERR(regmap)); |
| 56 | return PTR_ERR(regmap); |
| 57 | } |
| 58 | |
| 59 | ret = mpu3050_common_probe(&client->dev, regmap, client->irq, name); |
| 60 | if (ret) |
| 61 | return ret; |
| 62 | |
| 63 | /* The main driver is up, now register the I2C mux */ |
| 64 | mpu3050 = iio_priv(dev_get_drvdata(&client->dev)); |
| 65 | mpu3050->i2cmux = i2c_mux_alloc(client->adapter, &client->dev, |
| 66 | 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, |
| 67 | mpu3050_i2c_bypass_select, |
| 68 | mpu3050_i2c_bypass_deselect); |
| 69 | /* Just fail the mux, there is no point in killing the driver */ |
| 70 | if (!mpu3050->i2cmux) |
| 71 | dev_err(&client->dev, "failed to allocate I2C mux\n"); |
| 72 | else { |
| 73 | mpu3050->i2cmux->priv = mpu3050; |
Peter Rosin | 6a95d82 | 2017-04-03 10:38:37 +0200 | [diff] [blame] | 74 | /* Ignore failure, not critical */ |
| 75 | i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0, 0); |
Linus Walleij | 3904b28 | 2016-10-25 16:15:54 +0200 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int mpu3050_i2c_remove(struct i2c_client *client) |
| 82 | { |
| 83 | struct iio_dev *indio_dev = dev_get_drvdata(&client->dev); |
| 84 | struct mpu3050 *mpu3050 = iio_priv(indio_dev); |
| 85 | |
| 86 | if (mpu3050->i2cmux) |
| 87 | i2c_mux_del_adapters(mpu3050->i2cmux); |
| 88 | |
| 89 | return mpu3050_common_remove(&client->dev); |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * device id table is used to identify what device can be |
| 94 | * supported by this driver |
| 95 | */ |
| 96 | static const struct i2c_device_id mpu3050_i2c_id[] = { |
| 97 | { "mpu3050" }, |
| 98 | {} |
| 99 | }; |
| 100 | MODULE_DEVICE_TABLE(i2c, mpu3050_i2c_id); |
| 101 | |
| 102 | static const struct of_device_id mpu3050_i2c_of_match[] = { |
| 103 | { .compatible = "invensense,mpu3050", .data = "mpu3050" }, |
| 104 | /* Deprecated vendor ID from the Input driver */ |
| 105 | { .compatible = "invn,mpu3050", .data = "mpu3050" }, |
| 106 | { }, |
| 107 | }; |
| 108 | MODULE_DEVICE_TABLE(of, mpu3050_i2c_of_match); |
| 109 | |
| 110 | static struct i2c_driver mpu3050_i2c_driver = { |
| 111 | .probe = mpu3050_i2c_probe, |
| 112 | .remove = mpu3050_i2c_remove, |
| 113 | .id_table = mpu3050_i2c_id, |
| 114 | .driver = { |
| 115 | .of_match_table = mpu3050_i2c_of_match, |
| 116 | .name = "mpu3050-i2c", |
| 117 | .pm = &mpu3050_dev_pm_ops, |
| 118 | }, |
| 119 | }; |
| 120 | module_i2c_driver(mpu3050_i2c_driver); |
| 121 | |
| 122 | MODULE_AUTHOR("Linus Walleij"); |
| 123 | MODULE_DESCRIPTION("Invensense MPU3050 gyroscope driver"); |
| 124 | MODULE_LICENSE("GPL"); |