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39368eda MW |
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/ab8500.h> | |
14 | ||
15 | #include <mach/prcmu.h> | |
16 | ||
17 | static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data) | |
18 | { | |
19 | int ret; | |
20 | ||
21 | ret = prcmu_abb_write((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1); | |
22 | if (ret < 0) | |
23 | dev_err(ab8500->dev, "prcmu i2c error %d\n", ret); | |
24 | return ret; | |
25 | } | |
26 | ||
27 | static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr) | |
28 | { | |
29 | int ret; | |
30 | u8 data; | |
31 | ||
32 | ret = prcmu_abb_read((u8)(addr >> 8), (u8)(addr & 0xFF), &data, 1); | |
33 | if (ret < 0) { | |
34 | dev_err(ab8500->dev, "prcmu i2c error %d\n", ret); | |
35 | return ret; | |
36 | } | |
37 | return (int)data; | |
38 | } | |
39 | ||
40 | static int __devinit ab8500_i2c_probe(struct platform_device *plf) | |
41 | { | |
42 | struct ab8500 *ab8500; | |
43 | struct resource *resource; | |
44 | int ret; | |
45 | ||
46 | ab8500 = kzalloc(sizeof *ab8500, GFP_KERNEL); | |
47 | if (!ab8500) | |
48 | return -ENOMEM; | |
49 | ||
50 | ab8500->dev = &plf->dev; | |
51 | ||
52 | resource = platform_get_resource(plf, IORESOURCE_IRQ, 0); | |
53 | if (!resource) { | |
54 | kfree(ab8500); | |
55 | return -ENODEV; | |
56 | } | |
57 | ||
58 | ab8500->irq = resource->start; | |
59 | ||
60 | ab8500->read = ab8500_i2c_read; | |
61 | ab8500->write = ab8500_i2c_write; | |
62 | ||
63 | platform_set_drvdata(plf, ab8500); | |
64 | ||
65 | ret = ab8500_init(ab8500); | |
66 | if (ret) | |
67 | kfree(ab8500); | |
68 | ||
69 | return ret; | |
70 | } | |
71 | ||
72 | static int __devexit ab8500_i2c_remove(struct platform_device *plf) | |
73 | { | |
74 | struct ab8500 *ab8500 = platform_get_drvdata(plf); | |
75 | ||
76 | ab8500_exit(ab8500); | |
77 | kfree(ab8500); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static struct platform_driver ab8500_i2c_driver = { | |
83 | .driver = { | |
84 | .name = "ab8500-i2c", | |
85 | .owner = THIS_MODULE, | |
86 | }, | |
87 | .probe = ab8500_i2c_probe, | |
88 | .remove = __devexit_p(ab8500_i2c_remove) | |
89 | }; | |
90 | ||
91 | static int __init ab8500_i2c_init(void) | |
92 | { | |
93 | return platform_driver_register(&ab8500_i2c_driver); | |
94 | } | |
95 | ||
96 | static void __exit ab8500_i2c_exit(void) | |
97 | { | |
98 | platform_driver_unregister(&ab8500_i2c_driver); | |
99 | } | |
100 | subsys_initcall(ab8500_i2c_init); | |
101 | module_exit(ab8500_i2c_exit); | |
102 | ||
103 | MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com"); | |
104 | MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C"); | |
105 | MODULE_LICENSE("GPL v2"); |