1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
*
* Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "fimc-is-i2c.h"
struct fimc_is_i2c {
struct i2c_adapter adapter;
struct clk *clock;
};
/*
* An empty algorithm is used as the actual I2C bus controller driver
* is implemented in the FIMC-IS subsystem firmware and the host CPU
* doesn't access the I2C bus controller.
*/
static u32 is_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C;
}
static const struct i2c_algorithm fimc_is_i2c_algorithm = {
.functionality = is_i2c_func,
};
static int fimc_is_i2c_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct fimc_is_i2c *isp_i2c;
struct i2c_adapter *i2c_adap;
int ret;
isp_i2c = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c), GFP_KERNEL);
if (!isp_i2c)
return -ENOMEM;
isp_i2c->clock = devm_clk_get(&pdev->dev, "i2c_isp");
if (IS_ERR(isp_i2c->clock)) {
dev_err(&pdev->dev, "failed to get the clock\n");
return PTR_ERR(isp_i2c->clock);
}
i2c_adap = &isp_i2c->adapter;
i2c_adap->dev.of_node = node;
i2c_adap->dev.parent = &pdev->dev;
strscpy(i2c_adap->name, "exynos4x12-isp-i2c", sizeof(i2c_adap->name));
i2c_adap->owner = THIS_MODULE;
i2c_adap->algo = &fimc_is_i2c_algorithm;
platform_set_drvdata(pdev, isp_i2c);
pm_runtime_enable(&pdev->dev);
ret = i2c_add_adapter(i2c_adap);
if (ret < 0)
goto err_pm_dis;
/*
* Client drivers of this adapter don't do any I2C transfers as that
* is handled by the ISP firmware. But we rely on the runtime PM
* state propagation from the clients up to the adapter driver so
* clear the ignore_children flags here. PM rutnime calls are not
* used in probe() handler of clients of this adapter so there is
* no issues with clearing the flag right after registering the I2C
* adapter.
*/
pm_suspend_ignore_children(&i2c_adap->dev, false);
return 0;
err_pm_dis:
pm_runtime_disable(&pdev->dev);
return ret;
}
static void fimc_is_i2c_remove(struct platform_device *pdev)
{
struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
i2c_del_adapter(&isp_i2c->adapter);
}
#ifdef CONFIG_PM
static int fimc_is_i2c_runtime_suspend(struct device *dev)
{
struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
clk_disable_unprepare(isp_i2c->clock);
return 0;
}
static int fimc_is_i2c_runtime_resume(struct device *dev)
{
struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
return clk_prepare_enable(isp_i2c->clock);
}
#endif
#ifdef CONFIG_PM_SLEEP
static int fimc_is_i2c_suspend(struct device *dev)
{
if (pm_runtime_suspended(dev))
return 0;
return fimc_is_i2c_runtime_suspend(dev);
}
static int fimc_is_i2c_resume(struct device *dev)
{
if (pm_runtime_suspended(dev))
return 0;
return fimc_is_i2c_runtime_resume(dev);
}
#endif
static const struct dev_pm_ops fimc_is_i2c_pm_ops = {
SET_RUNTIME_PM_OPS(fimc_is_i2c_runtime_suspend,
fimc_is_i2c_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(fimc_is_i2c_suspend, fimc_is_i2c_resume)
};
static const struct of_device_id fimc_is_i2c_of_match[] = {
{ .compatible = FIMC_IS_I2C_COMPATIBLE },
{ },
};
static struct platform_driver fimc_is_i2c_driver = {
.probe = fimc_is_i2c_probe,
.remove_new = fimc_is_i2c_remove,
.driver = {
.of_match_table = fimc_is_i2c_of_match,
.name = "fimc-isp-i2c",
.pm = &fimc_is_i2c_pm_ops,
}
};
int fimc_is_register_i2c_driver(void)
{
return platform_driver_register(&fimc_is_i2c_driver);
}
void fimc_is_unregister_i2c_driver(void)
{
platform_driver_unregister(&fimc_is_i2c_driver);
}
|
