projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3904b28e LW |
1 | #include <linux/err.h> |
| 2 | #include <linux/i2c.h> | |
| 3 | #include <linux/i2c-mux.h> | |
| 4 | #include <linux/iio/iio.h> | |
| 5 | #include <linux/module.h> | |
| 6 | #include <linux/regmap.h> | |
| 7 | #include <linux/pm_runtime.h> | |
| 8 | ||
| 9 | #include "mpu3050.h" | |
| 10 | ||
| 11 | static const struct regmap_config mpu3050_i2c_regmap_config = { | |
| 12 | .reg_bits = 8, | |
| 13 | .val_bits = 8, | |
| 14 | }; | |
| 15 | ||
| 16 | static int mpu3050_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id) | |
| 17 | { | |
| 18 | struct mpu3050 *mpu3050 = i2c_mux_priv(mux); | |
| 19 | ||
| 20 | /* Just power up the device, that is all that is needed */ | |
| 21 | pm_runtime_get_sync(mpu3050->dev); | |
| 22 | return 0; | |
| 23 | } | |
| 24 | ||
| 25 | static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id) | |
| 26 | { | |
| 27 | struct mpu3050 *mpu3050 = i2c_mux_priv(mux); | |
| 28 | ||
| 29 | pm_runtime_mark_last_busy(mpu3050->dev); | |
| 30 | pm_runtime_put_autosuspend(mpu3050->dev); | |
| 31 | return 0; | |
| 32 | } | |
| 33 | ||
| 34 | static int mpu3050_i2c_probe(struct i2c_client *client, | |
| 35 | const struct i2c_device_id *id) | |
| 36 | { | |
| 37 | struct regmap *regmap; | |
| 38 | const char *name; | |
| 39 | struct mpu3050 *mpu3050; | |
| 40 | int ret; | |
| 41 | ||
| 42 | if (!i2c_check_functionality(client->adapter, | |
| 43 | I2C_FUNC_SMBUS_I2C_BLOCK)) | |
| 44 | return -EOPNOTSUPP; | |
| 45 | ||
| 46 | if (id) | |
| 47 | name = id->name; | |
| 48 | else | |
| 49 | return -ENODEV; | |
| 50 | ||
| 51 | regmap = devm_regmap_init_i2c(client, &mpu3050_i2c_regmap_config); | |
| 52 | if (IS_ERR(regmap)) { | |
| 53 | dev_err(&client->dev, "Failed to register i2c regmap %d\n", | |
| 54 | (int)PTR_ERR(regmap)); | |
| 55 | return PTR_ERR(regmap); | |
| 56 | } | |
| 57 | ||
| 58 | ret = mpu3050_common_probe(&client->dev, regmap, client->irq, name); | |
| 59 | if (ret) | |
| 60 | return ret; | |
| 61 | ||
| 62 | /* The main driver is up, now register the I2C mux */ | |
| 63 | mpu3050 = iio_priv(dev_get_drvdata(&client->dev)); | |
| 64 | mpu3050->i2cmux = i2c_mux_alloc(client->adapter, &client->dev, | |
| 65 | 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, | |
| 66 | mpu3050_i2c_bypass_select, | |
| 67 | mpu3050_i2c_bypass_deselect); | |
| 68 | /* Just fail the mux, there is no point in killing the driver */ | |
| 69 | if (!mpu3050->i2cmux) | |
| 70 | dev_err(&client->dev, "failed to allocate I2C mux\n"); | |
| 71 | else { | |
| 72 | mpu3050->i2cmux->priv = mpu3050; | |
| 6a95d825 PR |
73 | /* Ignore failure, not critical */ |
| 74 | i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0, 0); | |
| 3904b28e LW |
75 | } |
| 76 | ||
| 77 | return 0; | |
| 78 | } | |
| 79 | ||
| 80 | static int mpu3050_i2c_remove(struct i2c_client *client) | |
| 81 | { | |
| 82 | struct iio_dev *indio_dev = dev_get_drvdata(&client->dev); | |
| 83 | struct mpu3050 *mpu3050 = iio_priv(indio_dev); | |
| 84 | ||
| 85 | if (mpu3050->i2cmux) | |
| 86 | i2c_mux_del_adapters(mpu3050->i2cmux); | |
| 87 | ||
| 88 | return mpu3050_common_remove(&client->dev); | |
| 89 | } | |
| 90 | ||
| 91 | /* | |
| 92 | * device id table is used to identify what device can be | |
| 93 | * supported by this driver | |
| 94 | */ | |
| 95 | static const struct i2c_device_id mpu3050_i2c_id[] = { | |
| 96 | { "mpu3050" }, | |
| 97 | {} | |
| 98 | }; | |
| 99 | MODULE_DEVICE_TABLE(i2c, mpu3050_i2c_id); | |
| 100 | ||
| 101 | static const struct of_device_id mpu3050_i2c_of_match[] = { | |
| 102 | { .compatible = "invensense,mpu3050", .data = "mpu3050" }, | |
| 103 | /* Deprecated vendor ID from the Input driver */ | |
| 104 | { .compatible = "invn,mpu3050", .data = "mpu3050" }, | |
| 105 | { }, | |
| 106 | }; | |
| 107 | MODULE_DEVICE_TABLE(of, mpu3050_i2c_of_match); | |
| 108 | ||
| 109 | static struct i2c_driver mpu3050_i2c_driver = { | |
| 110 | .probe = mpu3050_i2c_probe, | |
| 111 | .remove = mpu3050_i2c_remove, | |
| 112 | .id_table = mpu3050_i2c_id, | |
| 113 | .driver = { | |
| 114 | .of_match_table = mpu3050_i2c_of_match, | |
| 115 | .name = "mpu3050-i2c", | |
| 116 | .pm = &mpu3050_dev_pm_ops, | |
| 117 | }, | |
| 118 | }; | |
| 119 | module_i2c_driver(mpu3050_i2c_driver); | |
| 120 | ||
| 121 | MODULE_AUTHOR("Linus Walleij"); | |
| 122 | MODULE_DESCRIPTION("Invensense MPU3050 gyroscope driver"); | |
| 123 | MODULE_LICENSE("GPL"); |