xref: /openbmc/linux/drivers/iio/gyro/mpu3050-i2c.c (revision 6c33a6f4)
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