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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 
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_write_masked(struct ab8500 * ab8500,u16 addr,u8 mask,u8 data)26 static 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 
ab8500_i2c_read(struct ab8500 * ab8500,u16 addr)38 static 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 
ab8500_i2c_probe(struct platform_device * plf)51 static 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 
ab8500_i2c_remove(struct platform_device * plf)86 static 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 
96 static 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 
104 static 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 
ab8500_i2c_init(void)114 static int __init ab8500_i2c_init(void)
115 {
116 	return platform_driver_register(&ab8500_i2c_driver);
117 }
118 
ab8500_i2c_exit(void)119 static void __exit ab8500_i2c_exit(void)
120 {
121 	platform_driver_unregister(&ab8500_i2c_driver);
122 }
123 arch_initcall(ab8500_i2c_init);
124 module_exit(ab8500_i2c_exit);
125 
126 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
127 MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C");
128 MODULE_LICENSE("GPL v2");
129