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 
17 #include <linux/iio/common/st_sensors_i2c.h>
18 
19 
20 #define ST_SENSORS_I2C_MULTIREAD	0x80
21 
22 static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev)
23 {
24 	struct st_sensor_data *sdata = iio_priv(indio_dev);
25 
26 	return to_i2c_client(sdata->dev)->irq;
27 }
28 
29 static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb,
30 				struct device *dev, u8 reg_addr, u8 *res_byte)
31 {
32 	int err;
33 
34 	err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr);
35 	if (err < 0)
36 		goto st_accel_i2c_read_byte_error;
37 
38 	*res_byte = err & 0xff;
39 
40 st_accel_i2c_read_byte_error:
41 	return err < 0 ? err : 0;
42 }
43 
44 static int st_sensors_i2c_read_multiple_byte(
45 		struct st_sensor_transfer_buffer *tb, struct device *dev,
46 			u8 reg_addr, int len, u8 *data, bool multiread_bit)
47 {
48 	if (multiread_bit)
49 		reg_addr |= ST_SENSORS_I2C_MULTIREAD;
50 
51 	return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev),
52 							 reg_addr, len, data);
53 }
54 
55 static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,
56 				struct device *dev, u8 reg_addr, u8 data)
57 {
58 	return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data);
59 }
60 
61 static const struct st_sensor_transfer_function st_sensors_tf_i2c = {
62 	.read_byte = st_sensors_i2c_read_byte,
63 	.write_byte = st_sensors_i2c_write_byte,
64 	.read_multiple_byte = st_sensors_i2c_read_multiple_byte,
65 };
66 
67 void st_sensors_i2c_configure(struct iio_dev *indio_dev,
68 		struct i2c_client *client, struct st_sensor_data *sdata)
69 {
70 	i2c_set_clientdata(client, indio_dev);
71 
72 	indio_dev->dev.parent = &client->dev;
73 	indio_dev->name = client->name;
74 
75 	sdata->dev = &client->dev;
76 	sdata->tf = &st_sensors_tf_i2c;
77 	sdata->get_irq_data_ready = st_sensors_i2c_get_irq;
78 }
79 EXPORT_SYMBOL(st_sensors_i2c_configure);
80 
81 #ifdef CONFIG_ACPI
82 int st_sensors_match_acpi_device(struct device *dev)
83 {
84 	const struct acpi_device_id *acpi_id;
85 	kernel_ulong_t driver_data = 0;
86 
87 	if (ACPI_HANDLE(dev)) {
88 		acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
89 		if (!acpi_id) {
90 			dev_err(dev, "No driver data\n");
91 			return -EINVAL;
92 		}
93 		driver_data = acpi_id->driver_data;
94 	}
95 	return driver_data;
96 }
97 EXPORT_SYMBOL(st_sensors_match_acpi_device);
98 #endif
99 
100 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
101 MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
102 MODULE_LICENSE("GPL v2");
103