163 lines
3.9 KiB
C
163 lines
3.9 KiB
C
/*
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* Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
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*
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* Copyright (C) 2013 Samsung Electronics Co., Ltd.
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*
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* Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include "fimc-is-i2c.h"
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struct fimc_is_i2c {
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struct i2c_adapter adapter;
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struct clk *clock;
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};
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/*
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* An empty algorithm is used as the actual I2C bus controller driver
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* is implemented in the FIMC-IS subsystem firmware and the host CPU
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* doesn't access the I2C bus controller.
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*/
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static u32 is_i2c_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C;
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}
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static const struct i2c_algorithm fimc_is_i2c_algorithm = {
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.functionality = is_i2c_func,
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};
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static int fimc_is_i2c_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct fimc_is_i2c *isp_i2c;
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struct i2c_adapter *i2c_adap;
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int ret;
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isp_i2c = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c), GFP_KERNEL);
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if (!isp_i2c)
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return -ENOMEM;
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isp_i2c->clock = devm_clk_get(&pdev->dev, "i2c_isp");
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if (IS_ERR(isp_i2c->clock)) {
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dev_err(&pdev->dev, "failed to get the clock\n");
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return PTR_ERR(isp_i2c->clock);
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}
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i2c_adap = &isp_i2c->adapter;
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i2c_adap->dev.of_node = node;
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i2c_adap->dev.parent = &pdev->dev;
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strscpy(i2c_adap->name, "exynos4x12-isp-i2c", sizeof(i2c_adap->name));
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i2c_adap->owner = THIS_MODULE;
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i2c_adap->algo = &fimc_is_i2c_algorithm;
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i2c_adap->class = I2C_CLASS_SPD;
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platform_set_drvdata(pdev, isp_i2c);
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pm_runtime_enable(&pdev->dev);
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ret = i2c_add_adapter(i2c_adap);
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if (ret < 0)
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goto err_pm_dis;
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/*
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* Client drivers of this adapter don't do any I2C transfers as that
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* is handled by the ISP firmware. But we rely on the runtime PM
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* state propagation from the clients up to the adapter driver so
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* clear the ignore_children flags here. PM rutnime calls are not
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* used in probe() handler of clients of this adapter so there is
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* no issues with clearing the flag right after registering the I2C
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* adapter.
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*/
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pm_suspend_ignore_children(&i2c_adap->dev, false);
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return 0;
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err_pm_dis:
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pm_runtime_disable(&pdev->dev);
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return ret;
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}
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static int fimc_is_i2c_remove(struct platform_device *pdev)
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{
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struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev);
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pm_runtime_disable(&pdev->dev);
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i2c_del_adapter(&isp_i2c->adapter);
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return 0;
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}
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#ifdef CONFIG_PM
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static int fimc_is_i2c_runtime_suspend(struct device *dev)
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{
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struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
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clk_disable_unprepare(isp_i2c->clock);
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return 0;
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}
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static int fimc_is_i2c_runtime_resume(struct device *dev)
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{
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struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
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return clk_prepare_enable(isp_i2c->clock);
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}
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#endif
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#ifdef CONFIG_PM_SLEEP
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static int fimc_is_i2c_suspend(struct device *dev)
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{
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if (pm_runtime_suspended(dev))
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return 0;
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return fimc_is_i2c_runtime_suspend(dev);
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}
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static int fimc_is_i2c_resume(struct device *dev)
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{
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if (pm_runtime_suspended(dev))
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return 0;
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return fimc_is_i2c_runtime_resume(dev);
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}
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#endif
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static const struct dev_pm_ops fimc_is_i2c_pm_ops = {
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SET_RUNTIME_PM_OPS(fimc_is_i2c_runtime_suspend,
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fimc_is_i2c_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(fimc_is_i2c_suspend, fimc_is_i2c_resume)
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};
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static const struct of_device_id fimc_is_i2c_of_match[] = {
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{ .compatible = FIMC_IS_I2C_COMPATIBLE },
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{ },
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};
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static struct platform_driver fimc_is_i2c_driver = {
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.probe = fimc_is_i2c_probe,
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.remove = fimc_is_i2c_remove,
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.driver = {
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.of_match_table = fimc_is_i2c_of_match,
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.name = "fimc-isp-i2c",
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.pm = &fimc_is_i2c_pm_ops,
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}
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};
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int fimc_is_register_i2c_driver(void)
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{
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return platform_driver_register(&fimc_is_i2c_driver);
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}
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void fimc_is_unregister_i2c_driver(void)
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{
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platform_driver_unregister(&fimc_is_i2c_driver);
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}
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