da114376d3
This patch adds the ISP I2C bus controller driver files. Creating a standard I2C bus adapter, even if the driver doesn't actually communicate with the hardware and it is instead controlled by the ISP firmware running on the Cortex-A5, allows to use standard hardware description in the device tree. As the sensor would have actually had a standard V4L2 sub-device driver run on the host CPU. This approach allows to adapt the driver with a relatively small effort should the Imaging Subsystem architecture change so that the I2C bus is handled by the host's CPU OS, rather than the internal FIMC-IS ARM CPU firmware. The image sensor driver could be a standard I2C client driver, as in case of most existing image sensors. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
130 lines
3.2 KiB
C
130 lines
3.2 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/of_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 const struct i2c_algorithm fimc_is_i2c_algorithm;
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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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strlcpy(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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ret = i2c_add_adapter(i2c_adap);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to add I2C bus %s\n",
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node->full_name);
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return ret;
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}
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platform_set_drvdata(pdev, isp_i2c);
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pm_runtime_enable(&pdev->dev);
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pm_runtime_enable(&i2c_adap->dev);
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of_i2c_register_devices(i2c_adap);
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return 0;
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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(&isp_i2c->adapter.dev);
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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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static int fimc_is_i2c_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_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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UNIVERSAL_DEV_PM_OPS(fimc_is_i2c_pm_ops, fimc_is_i2c_suspend,
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fimc_is_i2c_resume, NULL);
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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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MODULE_DEVICE_TABLE(of, fimc_is_i2c_of_match);
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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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.owner = THIS_MODULE,
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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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EXPORT_SYMBOL(fimc_is_register_i2c_driver);
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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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EXPORT_SYMBOL(fimc_is_unregister_i2c_driver);
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