1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
4  * sensor, ADC and DAC
5  *
6  * Copyright 2010 Analog Devices Inc.
7  */
8 
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/module.h>
14 
15 #include "adt7316.h"
16 
17 /*
18  * adt7316 register access by I2C
19  */
adt7316_i2c_read(void * client,u8 reg,u8 * data)20 static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
21 {
22 	struct i2c_client *cl = client;
23 	int ret;
24 
25 	ret = i2c_smbus_write_byte(cl, reg);
26 	if (ret < 0) {
27 		dev_err(&cl->dev, "I2C fail to select reg\n");
28 		return ret;
29 	}
30 
31 	ret = i2c_smbus_read_byte(client);
32 	if (ret < 0) {
33 		dev_err(&cl->dev, "I2C read error\n");
34 		return ret;
35 	}
36 
37 	*data = ret;
38 
39 	return 0;
40 }
41 
adt7316_i2c_write(void * client,u8 reg,u8 data)42 static int adt7316_i2c_write(void *client, u8 reg, u8 data)
43 {
44 	struct i2c_client *cl = client;
45 	int ret;
46 
47 	ret = i2c_smbus_write_byte_data(cl, reg, data);
48 	if (ret < 0)
49 		dev_err(&cl->dev, "I2C write error\n");
50 
51 	return ret;
52 }
53 
adt7316_i2c_multi_read(void * client,u8 reg,u8 count,u8 * data)54 static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
55 {
56 	struct i2c_client *cl = client;
57 	int i, ret;
58 
59 	if (count > ADT7316_REG_MAX_ADDR)
60 		count = ADT7316_REG_MAX_ADDR;
61 
62 	for (i = 0; i < count; i++) {
63 		ret = adt7316_i2c_read(cl, reg, &data[i]);
64 		if (ret < 0) {
65 			dev_err(&cl->dev, "I2C multi read error\n");
66 			return ret;
67 		}
68 	}
69 
70 	return 0;
71 }
72 
adt7316_i2c_multi_write(void * client,u8 reg,u8 count,u8 * data)73 static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
74 {
75 	struct i2c_client *cl = client;
76 	int i, ret;
77 
78 	if (count > ADT7316_REG_MAX_ADDR)
79 		count = ADT7316_REG_MAX_ADDR;
80 
81 	for (i = 0; i < count; i++) {
82 		ret = adt7316_i2c_write(cl, reg, data[i]);
83 		if (ret < 0) {
84 			dev_err(&cl->dev, "I2C multi write error\n");
85 			return ret;
86 		}
87 	}
88 
89 	return 0;
90 }
91 
92 /*
93  * device probe and remove
94  */
95 
adt7316_i2c_probe(struct i2c_client * client)96 static int adt7316_i2c_probe(struct i2c_client *client)
97 {
98 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
99 	struct adt7316_bus bus = {
100 		.client = client,
101 		.irq = client->irq,
102 		.read = adt7316_i2c_read,
103 		.write = adt7316_i2c_write,
104 		.multi_read = adt7316_i2c_multi_read,
105 		.multi_write = adt7316_i2c_multi_write,
106 	};
107 
108 	return adt7316_probe(&client->dev, &bus, id->name);
109 }
110 
111 static const struct i2c_device_id adt7316_i2c_id[] = {
112 	{ "adt7316", 0 },
113 	{ "adt7317", 0 },
114 	{ "adt7318", 0 },
115 	{ "adt7516", 0 },
116 	{ "adt7517", 0 },
117 	{ "adt7519", 0 },
118 	{ }
119 };
120 
121 MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
122 
123 static const struct of_device_id adt7316_of_match[] = {
124 	{ .compatible = "adi,adt7316" },
125 	{ .compatible = "adi,adt7317" },
126 	{ .compatible = "adi,adt7318" },
127 	{ .compatible = "adi,adt7516" },
128 	{ .compatible = "adi,adt7517" },
129 	{ .compatible = "adi,adt7519" },
130 	{ },
131 };
132 
133 MODULE_DEVICE_TABLE(of, adt7316_of_match);
134 
135 static struct i2c_driver adt7316_driver = {
136 	.driver = {
137 		.name = "adt7316",
138 		.of_match_table = adt7316_of_match,
139 		.pm = ADT7316_PM_OPS,
140 	},
141 	.probe = adt7316_i2c_probe,
142 	.id_table = adt7316_i2c_id,
143 };
144 module_i2c_driver(adt7316_driver);
145 
146 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
147 MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and ADT7516/7/8 digital temperature sensor, ADC and DAC");
148 MODULE_LICENSE("GPL v2");
149