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/db8500-prcmu.h>
15
ab8500_i2c_write(struct ab8500 * ab8500,u16 addr,u8 data)16 static 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
ab8500_i2c_read(struct ab8500 * ab8500,u16 addr)26 static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
27 {
28 int ret;
29 u8 data;
30
31 ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1);
32 if (ret < 0) {
33 dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
34 return ret;
35 }
36 return (int)data;
37 }
38
ab8500_i2c_probe(struct platform_device * plf)39 static int __devinit ab8500_i2c_probe(struct platform_device *plf)
40 {
41 struct ab8500 *ab8500;
42 struct resource *resource;
43 int ret;
44
45 ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL);
46 if (!ab8500)
47 return -ENOMEM;
48
49 ab8500->dev = &plf->dev;
50
51 resource = platform_get_resource(plf, IORESOURCE_IRQ, 0);
52 if (!resource) {
53 kfree(ab8500);
54 return -ENODEV;
55 }
56
57 ab8500->irq = resource->start;
58
59 ab8500->read = ab8500_i2c_read;
60 ab8500->write = ab8500_i2c_write;
61
62 platform_set_drvdata(plf, ab8500);
63
64 ret = ab8500_init(ab8500);
65 if (ret)
66 kfree(ab8500);
67
68 return ret;
69 }
70
ab8500_i2c_remove(struct platform_device * plf)71 static int __devexit ab8500_i2c_remove(struct platform_device *plf)
72 {
73 struct ab8500 *ab8500 = platform_get_drvdata(plf);
74
75 ab8500_exit(ab8500);
76 kfree(ab8500);
77
78 return 0;
79 }
80
81 static struct platform_driver ab8500_i2c_driver = {
82 .driver = {
83 .name = "ab8500-i2c",
84 .owner = THIS_MODULE,
85 },
86 .probe = ab8500_i2c_probe,
87 .remove = __devexit_p(ab8500_i2c_remove)
88 };
89
ab8500_i2c_init(void)90 static int __init ab8500_i2c_init(void)
91 {
92 return platform_driver_register(&ab8500_i2c_driver);
93 }
94
ab8500_i2c_exit(void)95 static void __exit ab8500_i2c_exit(void)
96 {
97 platform_driver_unregister(&ab8500_i2c_driver);
98 }
99 arch_initcall(ab8500_i2c_init);
100 module_exit(ab8500_i2c_exit);
101
102 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
103 MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
104 MODULE_LICENSE("GPL v2");
105