2 * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
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.
13 #include <linux/clk.h>
14 #include <linux/module.h>
15 #include <linux/of_i2c.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/slab.h>
19 #include "fimc-is-i2c.h"
22 struct i2c_adapter adapter
;
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.
31 static const struct i2c_algorithm fimc_is_i2c_algorithm
;
33 static int fimc_is_i2c_probe(struct platform_device
*pdev
)
35 struct device_node
*node
= pdev
->dev
.of_node
;
36 struct fimc_is_i2c
*isp_i2c
;
37 struct i2c_adapter
*i2c_adap
;
40 isp_i2c
= devm_kzalloc(&pdev
->dev
, sizeof(*isp_i2c
), GFP_KERNEL
);
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
);
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
;
58 ret
= i2c_add_adapter(i2c_adap
);
60 dev_err(&pdev
->dev
, "failed to add I2C bus %s\n",
65 platform_set_drvdata(pdev
, isp_i2c
);
67 pm_runtime_enable(&pdev
->dev
);
68 pm_runtime_enable(&i2c_adap
->dev
);
70 of_i2c_register_devices(i2c_adap
);
75 static int fimc_is_i2c_remove(struct platform_device
*pdev
)
77 struct fimc_is_i2c
*isp_i2c
= platform_get_drvdata(pdev
);
79 pm_runtime_disable(&isp_i2c
->adapter
.dev
);
80 pm_runtime_disable(&pdev
->dev
);
81 i2c_del_adapter(&isp_i2c
->adapter
);
86 static int fimc_is_i2c_suspend(struct device
*dev
)
88 struct fimc_is_i2c
*isp_i2c
= dev_get_drvdata(dev
);
89 clk_disable_unprepare(isp_i2c
->clock
);
93 static int fimc_is_i2c_resume(struct device
*dev
)
95 struct fimc_is_i2c
*isp_i2c
= dev_get_drvdata(dev
);
96 return clk_prepare_enable(isp_i2c
->clock
);
99 UNIVERSAL_DEV_PM_OPS(fimc_is_i2c_pm_ops
, fimc_is_i2c_suspend
,
100 fimc_is_i2c_resume
, NULL
);
102 static const struct of_device_id fimc_is_i2c_of_match
[] = {
103 { .compatible
= FIMC_IS_I2C_COMPATIBLE
},
107 static struct platform_driver fimc_is_i2c_driver
= {
108 .probe
= fimc_is_i2c_probe
,
109 .remove
= fimc_is_i2c_remove
,
111 .of_match_table
= fimc_is_i2c_of_match
,
112 .name
= "fimc-isp-i2c",
113 .owner
= THIS_MODULE
,
114 .pm
= &fimc_is_i2c_pm_ops
,
118 int fimc_is_register_i2c_driver(void)
120 return platform_driver_register(&fimc_is_i2c_driver
);
123 void fimc_is_unregister_i2c_driver(void)
125 platform_driver_unregister(&fimc_is_i2c_driver
);