Gitiles
Code Review Sign In
192.168.1.100 / T106_DC / b17954087a518c55bf8a9a66f44efeff0509e6d1 / . / ap / os / linux / linux-3.4.x / drivers / mfd / ab8500-i2c.c
blob: b83045f102bed1c93251b41716f4ffc06f8f88f1 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -0700[diff] [blame]1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
4 * License Terms: GNU General Public License v2
5 * This file was based on drivers/mfd/ab8500-spi.c
6 */
7
8#include <linux/kernel.h>
9#include <linux/slab.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/mfd/abx500/ab8500.h>
14#include <linux/mfd/dbx500-prcmu.h>
15
16static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
17{
18 int ret;
19
20 ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
21 if (ret < 0)
22 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
23 return ret;
24}
25
26static int ab8500_i2c_write_masked(struct ab8500 *ab8500, u16 addr, u8 mask,
27 u8 data)
28{
29 int ret;
30
31 ret = prcmu_abb_write_masked((u8)(addr >> 8), (u8)(addr & 0xFF), &data,
32 &mask, 1);
33 if (ret < 0)
34 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
35 return ret;
36}
37
38static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
39{
40 int ret;
41 u8 data;
42
43 ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
44 if (ret < 0) {
45 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
46 return ret;
47 }
48 return (int)data;
49}
50
51static int __devinit ab8500_i2c_probe(struct platform_device *plf)
52{
53 const struct platform_device_id *platid = platform_get_device_id(plf);
54 struct ab8500 *ab8500;
55 struct resource *resource;
56 int ret;
57
58 ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
59 if (!ab8500)
60 return -ENOMEM;
61
62 ab8500->dev = &plf->dev;
63
64 resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
65 if (!resource) {
66 kfree(ab8500);
67 return -ENODEV;
68 }
69
70 ab8500->irq = resource->start;
71
72 ab8500->read = ab8500_i2c_read;
73 ab8500->write = ab8500_i2c_write;
74 ab8500->write_masked = ab8500_i2c_write_masked;
75
76 platform_set_drvdata(plf, ab8500);
77
78 ret = ab8500_init(ab8500, platid->driver_data);
79 if (ret)
80 kfree(ab8500);
81
82
83 return ret;
84}
85
86static int __devexit ab8500_i2c_remove(struct platform_device *plf)
87{
88 struct ab8500 *ab8500 = platform_get_drvdata(plf);
89
90 ab8500_exit(ab8500);
91 kfree(ab8500);
92
93 return 0;
94}
95
96static const struct platform_device_id ab8500_id[] = {
97 { "ab8500-i2c", AB8500_VERSION_AB8500 },
98 { "ab8505-i2c", AB8500_VERSION_AB8505 },
99 { "ab9540-i2c", AB8500_VERSION_AB9540 },
100 { "ab8540-i2c", AB8500_VERSION_AB8540 },
101 { }
102};
103
104static struct platform_driver ab8500_i2c_driver = {
105 .driver = {
106 .name = "ab8500-i2c",
107 .owner = THIS_MODULE,
108 },
109 .probe = ab8500_i2c_probe,
110 .remove = __devexit_p(ab8500_i2c_remove),
111 .id_table = ab8500_id,
112};
113
114static int __init ab8500_i2c_init(void)
115{
116 return platform_driver_register(&ab8500_i2c_driver);
117}
118
119static void __exit ab8500_i2c_exit(void)
120{
121 platform_driver_unregister(&ab8500_i2c_driver);
122}
123arch_initcall(ab8500_i2c_init);
124module_exit(ab8500_i2c_exit);
125
126MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
127MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
128MODULE_LICENSE("GPL v2");