1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * STMicroelectronics sensors i2c library driver
4 *
5 * Copyright 2012-2013 STMicroelectronics Inc.
6 *
7 * Denis Ciocca <denis.ciocca@st.com>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/iio/iio.h>
14 #include <linux/of_device.h>
15 #include <linux/acpi.h>
16 #include <linux/regmap.h>
17
18 #include <linux/iio/common/st_sensors_i2c.h>
19
20
21 #define ST_SENSORS_I2C_MULTIREAD 0x80
22
23 static const struct regmap_config st_sensors_i2c_regmap_config = {
24 .reg_bits = 8,
25 .val_bits = 8,
26 };
27
28 static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = {
29 .reg_bits = 8,
30 .val_bits = 8,
31 .read_flag_mask = ST_SENSORS_I2C_MULTIREAD,
32 };
33
34 /*
35 * st_sensors_i2c_configure() - configure I2C interface
36 * @indio_dev: IIO device reference.
37 * @client: i2c client reference.
38 *
39 * Return: 0 on success, else a negative error code.
40 */
st_sensors_i2c_configure(struct iio_dev * indio_dev,struct i2c_client * client)41 int st_sensors_i2c_configure(struct iio_dev *indio_dev,
42 struct i2c_client *client)
43 {
44 struct st_sensor_data *sdata = iio_priv(indio_dev);
45 const struct regmap_config *config;
46
47 if (sdata->sensor_settings->multi_read_bit)
48 config = &st_sensors_i2c_regmap_multiread_bit_config;
49 else
50 config = &st_sensors_i2c_regmap_config;
51
52 sdata->regmap = devm_regmap_init_i2c(client, config);
53 if (IS_ERR(sdata->regmap)) {
54 dev_err(&client->dev, "Failed to register i2c regmap (%d)\n",
55 (int)PTR_ERR(sdata->regmap));
56 return PTR_ERR(sdata->regmap);
57 }
58
59 i2c_set_clientdata(client, indio_dev);
60
61 indio_dev->dev.parent = &client->dev;
62 indio_dev->name = client->name;
63
64 sdata->dev = &client->dev;
65 sdata->irq = client->irq;
66
67 return 0;
68 }
69 EXPORT_SYMBOL(st_sensors_i2c_configure);
70
71 #ifdef CONFIG_ACPI
st_sensors_match_acpi_device(struct device * dev)72 int st_sensors_match_acpi_device(struct device *dev)
73 {
74 const struct acpi_device_id *acpi_id;
75 kernel_ulong_t driver_data = 0;
76
77 if (ACPI_HANDLE(dev)) {
78 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
79 if (!acpi_id) {
80 dev_err(dev, "No driver data\n");
81 return -EINVAL;
82 }
83 driver_data = acpi_id->driver_data;
84 }
85 return driver_data;
86 }
87 EXPORT_SYMBOL(st_sensors_match_acpi_device);
88 #endif
89
90 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
91 MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
92 MODULE_LICENSE("GPL v2");
93
