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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> | |
ee66e653 | 13 | #include <linux/mfd/abx500/ab8500.h> |
bc628fd1 | 14 | #include <linux/mfd/dbx500-prcmu.h> |
39368eda MW |
15 | |
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 | ||
bc628fd1 MN |
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 | ||
39368eda MW |
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 | ||
51 | static int __devinit ab8500_i2c_probe(struct platform_device *plf) | |
52 | { | |
0f620837 | 53 | const struct platform_device_id *platid = platform_get_device_id(plf); |
39368eda MW |
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; | |
bc628fd1 | 74 | ab8500->write_masked = ab8500_i2c_write_masked; |
39368eda MW |
75 | |
76 | platform_set_drvdata(plf, ab8500); | |
77 | ||
0f620837 | 78 | ret = ab8500_init(ab8500, platid->driver_data); |
39368eda MW |
79 | if (ret) |
80 | kfree(ab8500); | |
81 | ||
0f620837 | 82 | |
39368eda MW |
83 | return ret; |
84 | } | |
85 | ||
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 | ||
0f620837 LW |
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 | ||
7e82d6ff RV |
104 | #ifdef CONFIG_PM |
105 | static int ab8500_i2c_suspend(struct device *dev) | |
106 | { | |
107 | struct ab8500 *ab = dev_get_drvdata(dev); | |
108 | ||
109 | disable_irq(ab->irq); | |
110 | enable_irq_wake(ab->irq); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int ab8500_i2c_resume(struct device *dev) | |
116 | { | |
117 | struct ab8500 *ab = dev_get_drvdata(dev); | |
118 | ||
119 | disable_irq_wake(ab->irq); | |
120 | enable_irq(ab->irq); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static const struct dev_pm_ops ab8500_i2c_pm_ops = { | |
126 | .suspend = ab8500_i2c_suspend, | |
127 | .resume = ab8500_i2c_resume, | |
128 | }; | |
129 | ||
130 | #define AB8500_I2C_PM_OPS (&ab8500_i2c_pm_ops) | |
131 | #else | |
132 | #define AB8500_I2C_PM_OPS NULL | |
133 | #endif | |
134 | ||
39368eda MW |
135 | static struct platform_driver ab8500_i2c_driver = { |
136 | .driver = { | |
137 | .name = "ab8500-i2c", | |
138 | .owner = THIS_MODULE, | |
7e82d6ff | 139 | .pm = AB8500_I2C_PM_OPS, |
39368eda MW |
140 | }, |
141 | .probe = ab8500_i2c_probe, | |
0f620837 LW |
142 | .remove = __devexit_p(ab8500_i2c_remove), |
143 | .id_table = ab8500_id, | |
39368eda MW |
144 | }; |
145 | ||
146 | static int __init ab8500_i2c_init(void) | |
147 | { | |
148 | return platform_driver_register(&ab8500_i2c_driver); | |
149 | } | |
150 | ||
151 | static void __exit ab8500_i2c_exit(void) | |
152 | { | |
153 | platform_driver_unregister(&ab8500_i2c_driver); | |
154 | } | |
0cb3fcd7 | 155 | arch_initcall(ab8500_i2c_init); |
39368eda MW |
156 | module_exit(ab8500_i2c_exit); |
157 | ||
158 | MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com"); | |
159 | MODULE_DESCRIPTION("AB8500 Core access via PRCMU I2C"); | |
160 | MODULE_LICENSE("GPL v2"); |