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/*
* Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
*
* Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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;
i2c_adap->class = I2C_CLASS_SPD;
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 int 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);
return 0;
}
#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 = 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);
}
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