1 /*
2 * I2C driver for the X-Powers' Power Management ICs
3 *
4 * AXP20x typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
5 * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
6 * as well as configurable GPIOs.
7 *
8 * This driver supports the I2C variants.
9 *
10 * Copyright (C) 2014 Carlo Caione
11 *
12 * Author: Carlo Caione <carlo@caione.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18
19 #include <linux/acpi.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/module.h>
23 #include <power/axp2101.h>
24 #include <linux/of.h>
25 #include <linux/regmap.h>
26 #include <linux/slab.h>
27
axp20x_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)28 static int axp20x_i2c_probe(struct i2c_client *i2c,
29 const struct i2c_device_id *id)
30 {
31 struct axp20x_dev *axp20x;
32 int ret;
33
34 axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
35 if (!axp20x)
36 return -ENOMEM;
37
38 axp20x->dev = &i2c->dev;
39 axp20x->irq = i2c->irq;
40 dev_set_drvdata(axp20x->dev, axp20x);
41
42 ret = axp20x_match_device(axp20x);
43 if (ret)
44 return ret;
45
46 axp20x->regmap = devm_regmap_init_i2c(i2c, axp20x->regmap_cfg);
47 if (IS_ERR(axp20x->regmap)) {
48 ret = PTR_ERR(axp20x->regmap);
49 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
50 return ret;
51 }
52
53 return axp20x_device_probe(axp20x);
54 }
55
axp20x_i2c_remove(struct i2c_client * i2c)56 static int axp20x_i2c_remove(struct i2c_client *i2c)
57 {
58 struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);
59
60 return axp20x_device_remove(axp20x);
61 }
62
63 static const struct of_device_id axp20x_i2c_of_match[] = {
64 { .compatible = "x-powers,axp152", .data = (void *)AXP152_ID },
65 { .compatible = "x-powers,axp202", .data = (void *)AXP202_ID },
66 { .compatible = "x-powers,axp209", .data = (void *)AXP209_ID },
67 { .compatible = "x-powers,axp221", .data = (void *)AXP221_ID },
68 { .compatible = "x-powers,axp2101", .data = (void *)AXP2101_ID },
69 { .compatible = "x-powers,axp15", .data = (void *)AXP15_ID },
70 { .compatible = "x-powers,axp1530", .data = (void *)AXP1530_ID },
71 { .compatible = "x-powers,axp858", .data = (void *)AXP858_ID },
72 { .compatible = "x-powers,axp803", .data = (void *)AXP803_ID },
73 { .compatible = "x-powers,axp2202", .data = (void *)AXP2202_ID },
74 { .compatible = "x-powers,axp806", .data = (void *)AXP806_ID },
75 { },
76 };
77 MODULE_DEVICE_TABLE(of, axp20x_i2c_of_match);
78
79 /*
80 * This is useless for OF-enabled devices, but it is needed by I2C subsystem
81 */
82 static const struct i2c_device_id axp20x_i2c_id[] = {
83 { },
84 };
85 MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
86
87 static const struct acpi_device_id axp20x_i2c_acpi_match[] = {
88 {
89 .id = "INT33F4",
90 .driver_data = AXP288_ID,
91 },
92 { },
93 };
94 MODULE_DEVICE_TABLE(acpi, axp20x_i2c_acpi_match);
95
96 static struct i2c_driver axp2101_i2c_driver = {
97 .driver = {
98 .name = "axp20x-i2c",
99 .of_match_table = of_match_ptr(axp20x_i2c_of_match),
100 .acpi_match_table = ACPI_PTR(axp20x_i2c_acpi_match),
101 },
102 .probe = axp20x_i2c_probe,
103 .remove = axp20x_i2c_remove,
104 .id_table = axp20x_i2c_id,
105 };
106
axp2101_i2c_init(void)107 static int __init axp2101_i2c_init(void)
108 {
109 int ret;
110
111 ret = i2c_add_driver(&axp2101_i2c_driver);
112 if (ret != 0) {
113 pr_err("axp2101 i2c registration failed %d\n", ret);
114 return ret;
115 }
116
117 return 0;
118 }
119 subsys_initcall(axp2101_i2c_init);
120
axp2101_i2c_exit(void)121 static void __exit axp2101_i2c_exit(void)
122 {
123 i2c_del_driver(&axp2101_i2c_driver);
124 }
125 module_exit(axp2101_i2c_exit);
126
127 MODULE_DESCRIPTION("PMIC MFD I2C driver for AXP20X");
128 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
129 MODULE_LICENSE("GPL");
130