Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 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> |
Wolfram Sang | 687b81d | 2013-07-11 12:56:15 +0100 | [diff] [blame] | 15 | #include <linux/i2c.h> |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 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 | |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 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 | |
Rafael J. Wysocki | e243c7c | 2014-12-04 01:10:10 +0100 | [diff] [blame] | 84 | #ifdef CONFIG_PM |
Tomasz Figa | d334ab0 | 2013-06-26 10:37:14 -0300 | [diff] [blame] | 85 | static int fimc_is_i2c_runtime_suspend(struct device *dev) |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 86 | { |
| 87 | struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev); |
Tomasz Figa | d334ab0 | 2013-06-26 10:37:14 -0300 | [diff] [blame] | 88 | |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 89 | clk_disable_unprepare(isp_i2c->clock); |
| 90 | return 0; |
| 91 | } |
| 92 | |
Tomasz Figa | d334ab0 | 2013-06-26 10:37:14 -0300 | [diff] [blame] | 93 | static int fimc_is_i2c_runtime_resume(struct device *dev) |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 94 | { |
| 95 | struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev); |
Tomasz Figa | d334ab0 | 2013-06-26 10:37:14 -0300 | [diff] [blame] | 96 | |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 97 | return clk_prepare_enable(isp_i2c->clock); |
| 98 | } |
Tomasz Figa | d334ab0 | 2013-06-26 10:37:14 -0300 | [diff] [blame] | 99 | #endif |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 100 | |
Tomasz Figa | d334ab0 | 2013-06-26 10:37:14 -0300 | [diff] [blame] | 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 | }; |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 124 | |
| 125 | static const struct of_device_id fimc_is_i2c_of_match[] = { |
| 126 | { .compatible = FIMC_IS_I2C_COMPATIBLE }, |
| 127 | { }, |
| 128 | }; |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 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", |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 136 | .pm = &fimc_is_i2c_pm_ops, |
| 137 | } |
| 138 | }; |
| 139 | |
| 140 | int fimc_is_register_i2c_driver(void) |
| 141 | { |
| 142 | return platform_driver_register(&fimc_is_i2c_driver); |
| 143 | } |
Sylwester Nawrocki | da11437 | 2013-03-11 15:28:18 -0300 | [diff] [blame] | 144 | |
| 145 | void fimc_is_unregister_i2c_driver(void) |
| 146 | { |
| 147 | platform_driver_unregister(&fimc_is_i2c_driver); |
| 148 | } |