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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         ret = i2c_add_adapter(i2c_adap);
 59         if (ret < 0) {
 60                 dev_err(&pdev->dev, "failed to add I2C bus %s\n",
 61                                                 node->full_name);
 62                 return ret;
 63         }
 64 
 65         platform_set_drvdata(pdev, isp_i2c);
 66 
 67         pm_runtime_enable(&pdev->dev);
 68         pm_runtime_enable(&i2c_adap->dev);
 69 
 70         return 0;
 71 }
 72 
 73 static int fimc_is_i2c_remove(struct platform_device *pdev)
 74 {
 75         struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev);
 76 
 77         pm_runtime_disable(&isp_i2c->adapter.dev);
 78         pm_runtime_disable(&pdev->dev);
 79         i2c_del_adapter(&isp_i2c->adapter);
 80 
 81         return 0;
 82 }
 83 
 84 #if defined(CONFIG_PM_RUNTIME) || defined(CONFIG_PM_SLEEP)
 85 static int fimc_is_i2c_runtime_suspend(struct device *dev)
 86 {
 87         struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
 88 
 89         clk_disable_unprepare(isp_i2c->clock);
 90         return 0;
 91 }
 92 
 93 static int fimc_is_i2c_runtime_resume(struct device *dev)
 94 {
 95         struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
 96 
 97         return clk_prepare_enable(isp_i2c->clock);
 98 }
 99 #endif
100 
101 #ifdef CONFIG_PM_SLEEP
102 static int fimc_is_i2c_suspend(struct device *dev)
103 {
104         if (pm_runtime_suspended(dev))
105                 return 0;
106 
107         return fimc_is_i2c_runtime_suspend(dev);
108 }
109 
110 static int fimc_is_i2c_resume(struct device *dev)
111 {
112         if (pm_runtime_suspended(dev))
113                 return 0;
114 
115         return fimc_is_i2c_runtime_resume(dev);
116 }
117 #endif
118 
119 static struct dev_pm_ops fimc_is_i2c_pm_ops = {
120         SET_RUNTIME_PM_OPS(fimc_is_i2c_runtime_suspend,
121                                         fimc_is_i2c_runtime_resume, NULL)
122         SET_SYSTEM_SLEEP_PM_OPS(fimc_is_i2c_suspend, fimc_is_i2c_resume)
123 };
124 
125 static const struct of_device_id fimc_is_i2c_of_match[] = {
126         { .compatible = FIMC_IS_I2C_COMPATIBLE },
127         { },
128 };
129 
130 static struct platform_driver fimc_is_i2c_driver = {
131         .probe          = fimc_is_i2c_probe,
132         .remove         = fimc_is_i2c_remove,
133         .driver = {
134                 .of_match_table = fimc_is_i2c_of_match,
135                 .name           = "fimc-isp-i2c",
136                 .owner          = THIS_MODULE,
137                 .pm             = &fimc_is_i2c_pm_ops,
138         }
139 };
140 
141 int fimc_is_register_i2c_driver(void)
142 {
143         return platform_driver_register(&fimc_is_i2c_driver);
144 }
145 
146 void fimc_is_unregister_i2c_driver(void)
147 {
148         platform_driver_unregister(&fimc_is_i2c_driver);
149 }
150 

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