1 // SPDX-License-Identifier: GPL-2.0-only 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; 74 /* Ignore failure, not critical */ 75 i2c_mux_add_adapter(mpu3050->i2cmux, 0, 0, 0); 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"); 125