From: Sylwester Nawrocki Date: Mon, 11 Mar 2013 18:28:18 +0000 (-0300) Subject: [media] exynos4-is: Add FIMC-IS ISP I2C bus driver X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=da114376d325298cce4a7271c4de9bd41c712266;p=openwrt%2Fstaging%2Fblogic.git [media] exynos4-is: Add FIMC-IS ISP I2C bus driver 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 Signed-off-by: Kyungmin Park Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/platform/exynos4-is/fimc-is-i2c.c b/drivers/media/platform/exynos4-is/fimc-is-i2c.c new file mode 100644 index 000000000000..1ec6b3c6a62a --- /dev/null +++ b/drivers/media/platform/exynos4-is/fimc-is-i2c.c @@ -0,0 +1,129 @@ +/* + * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * + * Author: Sylwester Nawrocki + * + * 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 +#include +#include +#include +#include +#include +#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 const struct i2c_algorithm fimc_is_i2c_algorithm; + +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; + strlcpy(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; + + ret = i2c_add_adapter(i2c_adap); + if (ret < 0) { + dev_err(&pdev->dev, "failed to add I2C bus %s\n", + node->full_name); + return ret; + } + + platform_set_drvdata(pdev, isp_i2c); + + pm_runtime_enable(&pdev->dev); + pm_runtime_enable(&i2c_adap->dev); + + of_i2c_register_devices(i2c_adap); + + return 0; +} + +static int fimc_is_i2c_remove(struct platform_device *pdev) +{ + struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev); + + pm_runtime_disable(&isp_i2c->adapter.dev); + pm_runtime_disable(&pdev->dev); + i2c_del_adapter(&isp_i2c->adapter); + + return 0; +} + +static int fimc_is_i2c_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_resume(struct device *dev) +{ + struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev); + return clk_prepare_enable(isp_i2c->clock); +} + +UNIVERSAL_DEV_PM_OPS(fimc_is_i2c_pm_ops, fimc_is_i2c_suspend, + fimc_is_i2c_resume, NULL); + +static const struct of_device_id fimc_is_i2c_of_match[] = { + { .compatible = FIMC_IS_I2C_COMPATIBLE }, + { }, +}; +MODULE_DEVICE_TABLE(of, fimc_is_i2c_of_match); + +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", + .owner = THIS_MODULE, + .pm = &fimc_is_i2c_pm_ops, + } +}; + +int fimc_is_register_i2c_driver(void) +{ + return platform_driver_register(&fimc_is_i2c_driver); +} +EXPORT_SYMBOL(fimc_is_register_i2c_driver); + +void fimc_is_unregister_i2c_driver(void) +{ + platform_driver_unregister(&fimc_is_i2c_driver); +} +EXPORT_SYMBOL(fimc_is_unregister_i2c_driver); diff --git a/drivers/media/platform/exynos4-is/fimc-is-i2c.h b/drivers/media/platform/exynos4-is/fimc-is-i2c.h new file mode 100644 index 000000000000..0d38d6bb963b --- /dev/null +++ b/drivers/media/platform/exynos4-is/fimc-is-i2c.h @@ -0,0 +1,15 @@ +/* + * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Sylwester Nawrocki + * + * 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. + */ + +#define FIMC_IS_I2C_COMPATIBLE "samsung,exynos4212-i2c-isp" + +int fimc_is_register_i2c_driver(void); +void fimc_is_unregister_i2c_driver(void);