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159 lines
3.8 KiB
159 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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