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
mpu3050_i2c_bypass_select(struct i2c_mux_core * mux,u32 chan_id)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
mpu3050_i2c_bypass_deselect(struct i2c_mux_core * mux,u32 chan_id)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
mpu3050_i2c_probe(struct i2c_client * client)35 static int mpu3050_i2c_probe(struct i2c_client *client)
36 {
37 const struct i2c_device_id *id = i2c_client_get_device_id(client);
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: %pe\n",
55 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
mpu3050_i2c_remove(struct i2c_client * client)81 static void 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 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 = pm_ptr(&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