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Linux/drivers/media/platform/exynos4-is/fimc-is-i2c.c

  1 /*
  2  * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
  3  *
  4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
  5  *
  6  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/clk.h>
 14 #include <linux/module.h>
 15 #include <linux/i2c.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/pm_runtime.h>
 18 #include <linux/slab.h>
 19 #include "fimc-is-i2c.h"
 20 
 21 struct fimc_is_i2c {
 22         struct i2c_adapter adapter;
 23         struct clk *clock;
 24 };
 25 
 26 /*
 27  * An empty algorithm is used as the actual I2C bus controller driver
 28  * is implemented in the FIMC-IS subsystem firmware and the host CPU
 29  * doesn't access the I2C bus controller.
 30  */
 31 static const struct i2c_algorithm fimc_is_i2c_algorithm;
 32 
 33 static int fimc_is_i2c_probe(struct platform_device *pdev)
 34 {
 35         struct device_node *node = pdev->dev.of_node;
 36         struct fimc_is_i2c *isp_i2c;
 37         struct i2c_adapter *i2c_adap;
 38         int ret;
 39 
 40         isp_i2c = devm_kzalloc(&pdev->dev, sizeof(*isp_i2c), GFP_KERNEL);
 41         if (!isp_i2c)
 42                 return -ENOMEM;
 43 
 44         isp_i2c->clock = devm_clk_get(&pdev->dev, "i2c_isp");
 45         if (IS_ERR(isp_i2c->clock)) {
 46                 dev_err(&pdev->dev, "failed to get the clock\n");
 47                 return PTR_ERR(isp_i2c->clock);
 48         }
 49 
 50         i2c_adap = &isp_i2c->adapter;
 51         i2c_adap->dev.of_node = node;
 52         i2c_adap->dev.parent = &pdev->dev;
 53         strlcpy(i2c_adap->name, "exynos4x12-isp-i2c", sizeof(i2c_adap->name));
 54         i2c_adap->owner = THIS_MODULE;
 55         i2c_adap->algo = &fimc_is_i2c_algorithm;
 56         i2c_adap->class = I2C_CLASS_SPD;
 57 
 58         platform_set_drvdata(pdev, isp_i2c);
 59         pm_runtime_enable(&pdev->dev);
 60 
 61         ret = i2c_add_adapter(i2c_adap);
 62         if (ret < 0)
 63                 goto err_pm_dis;
 64         /*
 65          * Client drivers of this adapter don't do any I2C transfers as that
 66          * is handled by the ISP firmware.  But we rely on the runtime PM
 67          * state propagation from the clients up to the adapter driver so
 68          * clear the ignore_children flags here.  PM rutnime calls are not
 69          * used in probe() handler of clients of this adapter so there is
 70          * no issues with clearing the flag right after registering the I2C
 71          * adapter.
 72          */
 73         pm_suspend_ignore_children(&i2c_adap->dev, false);
 74         return 0;
 75 
 76 err_pm_dis:
 77         pm_runtime_disable(&pdev->dev);
 78         return ret;
 79 }
 80 
 81 static int fimc_is_i2c_remove(struct platform_device *pdev)
 82 {
 83         struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev);
 84 
 85         pm_runtime_disable(&pdev->dev);
 86         i2c_del_adapter(&isp_i2c->adapter);
 87 
 88         return 0;
 89 }
 90 
 91 #ifdef CONFIG_PM
 92 static int fimc_is_i2c_runtime_suspend(struct device *dev)
 93 {
 94         struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
 95 
 96         clk_disable_unprepare(isp_i2c->clock);
 97         return 0;
 98 }
 99 
100 static int fimc_is_i2c_runtime_resume(struct device *dev)
101 {
102         struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
103 
104         return clk_prepare_enable(isp_i2c->clock);
105 }
106 #endif
107 
108 #ifdef CONFIG_PM_SLEEP
109 static int fimc_is_i2c_suspend(struct device *dev)
110 {
111         if (pm_runtime_suspended(dev))
112                 return 0;
113 
114         return fimc_is_i2c_runtime_suspend(dev);
115 }
116 
117 static int fimc_is_i2c_resume(struct device *dev)
118 {
119         if (pm_runtime_suspended(dev))
120                 return 0;
121 
122         return fimc_is_i2c_runtime_resume(dev);
123 }
124 #endif
125 
126 static struct dev_pm_ops fimc_is_i2c_pm_ops = {
127         SET_RUNTIME_PM_OPS(fimc_is_i2c_runtime_suspend,
128                                         fimc_is_i2c_runtime_resume, NULL)
129         SET_SYSTEM_SLEEP_PM_OPS(fimc_is_i2c_suspend, fimc_is_i2c_resume)
130 };
131 
132 static const struct of_device_id fimc_is_i2c_of_match[] = {
133         { .compatible = FIMC_IS_I2C_COMPATIBLE },
134         { },
135 };
136 
137 static struct platform_driver fimc_is_i2c_driver = {
138         .probe          = fimc_is_i2c_probe,
139         .remove         = fimc_is_i2c_remove,
140         .driver = {
141                 .of_match_table = fimc_is_i2c_of_match,
142                 .name           = "fimc-isp-i2c",
143                 .pm             = &fimc_is_i2c_pm_ops,
144         }
145 };
146 
147 int fimc_is_register_i2c_driver(void)
148 {
149         return platform_driver_register(&fimc_is_i2c_driver);
150 }
151 
152 void fimc_is_unregister_i2c_driver(void)
153 {
154         platform_driver_unregister(&fimc_is_i2c_driver);
155 }
156 

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