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da114376 SN |
1 | /* |
2 | * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver | |
3 | * | |
4 | * Copyright (C) 2013 Samsung Electronics Co., Ltd. | |
5 | * | |
6 | * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/module.h> | |
687b81d0 | 15 | #include <linux/i2c.h> |
da114376 SN |
16 | #include <linux/platform_device.h> |
17 | #include <linux/pm_runtime.h> | |
18 | #include <linux/slab.h> | |
19 | #include "fimc-is-i2c.h" | |
20 | ||
21 | struct fimc_is_i2c { | |
22 | struct i2c_adapter adapter; | |
23 | struct clk *clock; | |
24 | }; | |
25 | ||
26 | /* | |
27 | * An empty algorithm is used as the actual I2C bus controller driver | |
28 | * is implemented in the FIMC-IS subsystem firmware and the host CPU | |
29 | * doesn't access the I2C bus controller. | |
30 | */ | |
31 | static const struct i2c_algorithm fimc_is_i2c_algorithm; | |
32 | ||
33 | static int fimc_is_i2c_probe(struct platform_device *pdev) | |
34 | { | |
35 | struct device_node *node = pdev->dev.of_node; | |
36 | struct fimc_is_i2c *isp_i2c; | |
37 | struct i2c_adapter *i2c_adap; | |
38 | int ret; | |
39 | ||
40 | isp_i2c = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c), GFP_KERNEL); | |
41 | if (!isp_i2c) | |
42 | return -ENOMEM; | |
43 | ||
44 | isp_i2c->clock = devm_clk_get(&pdev->dev, "i2c_isp"); | |
45 | if (IS_ERR(isp_i2c->clock)) { | |
46 | dev_err(&pdev->dev, "failed to get the clock\n"); | |
47 | return PTR_ERR(isp_i2c->clock); | |
48 | } | |
49 | ||
50 | i2c_adap = &isp_i2c->adapter; | |
51 | i2c_adap->dev.of_node = node; | |
52 | i2c_adap->dev.parent = &pdev->dev; | |
53 | strlcpy(i2c_adap->name, "exynos4x12-isp-i2c", sizeof(i2c_adap->name)); | |
54 | i2c_adap->owner = THIS_MODULE; | |
55 | i2c_adap->algo = &fimc_is_i2c_algorithm; | |
56 | i2c_adap->class = I2C_CLASS_SPD; | |
57 | ||
58 | ret = i2c_add_adapter(i2c_adap); | |
59 | if (ret < 0) { | |
60 | dev_err(&pdev->dev, "failed to add I2C bus %s\n", | |
61 | node->full_name); | |
62 | return ret; | |
63 | } | |
64 | ||
65 | platform_set_drvdata(pdev, isp_i2c); | |
66 | ||
67 | pm_runtime_enable(&pdev->dev); | |
68 | pm_runtime_enable(&i2c_adap->dev); | |
69 | ||
da114376 SN |
70 | return 0; |
71 | } | |
72 | ||
73 | static int fimc_is_i2c_remove(struct platform_device *pdev) | |
74 | { | |
75 | struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev); | |
76 | ||
77 | pm_runtime_disable(&isp_i2c->adapter.dev); | |
78 | pm_runtime_disable(&pdev->dev); | |
79 | i2c_del_adapter(&isp_i2c->adapter); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
e243c7c1 | 84 | #ifdef CONFIG_PM |
d334ab08 | 85 | static int fimc_is_i2c_runtime_suspend(struct device *dev) |
da114376 SN |
86 | { |
87 | struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev); | |
d334ab08 | 88 | |
da114376 SN |
89 | clk_disable_unprepare(isp_i2c->clock); |
90 | return 0; | |
91 | } | |
92 | ||
d334ab08 | 93 | static int fimc_is_i2c_runtime_resume(struct device *dev) |
da114376 SN |
94 | { |
95 | struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev); | |
d334ab08 | 96 | |
da114376 SN |
97 | return clk_prepare_enable(isp_i2c->clock); |
98 | } | |
d334ab08 | 99 | #endif |
da114376 | 100 | |
d334ab08 TF |
101 | #ifdef CONFIG_PM_SLEEP |
102 | static int fimc_is_i2c_suspend(struct device *dev) | |
103 | { | |
104 | if (pm_runtime_suspended(dev)) | |
105 | return 0; | |
106 | ||
107 | return fimc_is_i2c_runtime_suspend(dev); | |
108 | } | |
109 | ||
110 | static int fimc_is_i2c_resume(struct device *dev) | |
111 | { | |
112 | if (pm_runtime_suspended(dev)) | |
113 | return 0; | |
114 | ||
115 | return fimc_is_i2c_runtime_resume(dev); | |
116 | } | |
117 | #endif | |
118 | ||
119 | static struct dev_pm_ops fimc_is_i2c_pm_ops = { | |
120 | SET_RUNTIME_PM_OPS(fimc_is_i2c_runtime_suspend, | |
121 | fimc_is_i2c_runtime_resume, NULL) | |
122 | SET_SYSTEM_SLEEP_PM_OPS(fimc_is_i2c_suspend, fimc_is_i2c_resume) | |
123 | }; | |
da114376 SN |
124 | |
125 | static const struct of_device_id fimc_is_i2c_of_match[] = { | |
126 | { .compatible = FIMC_IS_I2C_COMPATIBLE }, | |
127 | { }, | |
128 | }; | |
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129 | |
130 | static struct platform_driver fimc_is_i2c_driver = { | |
131 | .probe = fimc_is_i2c_probe, | |
132 | .remove = fimc_is_i2c_remove, | |
133 | .driver = { | |
134 | .of_match_table = fimc_is_i2c_of_match, | |
135 | .name = "fimc-isp-i2c", | |
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136 | .pm = &fimc_is_i2c_pm_ops, |
137 | } | |
138 | }; | |
139 | ||
140 | int fimc_is_register_i2c_driver(void) | |
141 | { | |
142 | return platform_driver_register(&fimc_is_i2c_driver); | |
143 | } | |
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144 | |
145 | void fimc_is_unregister_i2c_driver(void) | |
146 | { | |
147 | platform_driver_unregister(&fimc_is_i2c_driver); | |
148 | } |