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1 | /* linux/arch/arm/plat-samsung/dev-backlight.c |
2 | * | |
3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com | |
5 | * | |
6 | * Common infrastructure for PWM Backlight for Samsung boards | |
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/gpio.h> | |
14 | #include <linux/platform_device.h> | |
3d46cceb | 15 | #include <linux/slab.h> |
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16 | #include <linux/io.h> |
17 | #include <linux/pwm_backlight.h> | |
18 | ||
19 | #include <plat/devs.h> | |
20 | #include <plat/gpio-cfg.h> | |
21 | #include <plat/backlight.h> | |
22 | ||
23 | static int samsung_bl_init(struct device *dev) | |
24 | { | |
25 | int ret = 0; | |
26 | struct platform_device *timer_dev = | |
27 | container_of(dev->parent, struct platform_device, dev); | |
28 | struct samsung_bl_gpio_info *bl_gpio_info = | |
29 | timer_dev->dev.platform_data; | |
30 | ||
31 | ret = gpio_request(bl_gpio_info->no, "Backlight"); | |
32 | if (ret) { | |
33 | printk(KERN_ERR "failed to request GPIO for LCD Backlight\n"); | |
34 | return ret; | |
35 | } | |
36 | ||
37 | /* Configure GPIO pin with specific GPIO function for PWM timer */ | |
38 | s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func); | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
43 | static void samsung_bl_exit(struct device *dev) | |
44 | { | |
45 | struct platform_device *timer_dev = | |
46 | container_of(dev->parent, struct platform_device, dev); | |
47 | struct samsung_bl_gpio_info *bl_gpio_info = | |
48 | timer_dev->dev.platform_data; | |
49 | ||
50 | s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT); | |
51 | gpio_free(bl_gpio_info->no); | |
52 | } | |
53 | ||
54 | /* Initialize few important fields of platform_pwm_backlight_data | |
55 | * structure with default values. These fields can be overridden by | |
56 | * board-specific values sent from machine file. | |
57 | * For ease of operation, these fields are initialized with values | |
58 | * used by most samsung boards. | |
59 | * Users has the option of sending info about other parameters | |
60 | * for their specific boards | |
61 | */ | |
62 | ||
63 | static struct platform_pwm_backlight_data samsung_dfl_bl_data __initdata = { | |
64 | .max_brightness = 255, | |
65 | .dft_brightness = 255, | |
66 | .pwm_period_ns = 78770, | |
67 | .init = samsung_bl_init, | |
68 | .exit = samsung_bl_exit, | |
69 | }; | |
70 | ||
71 | static struct platform_device samsung_dfl_bl_device __initdata = { | |
72 | .name = "pwm-backlight", | |
73 | }; | |
74 | ||
75 | /* samsung_bl_set - Set board specific data (if any) provided by user for | |
76 | * PWM Backlight control and register specific PWM and backlight device. | |
77 | * @gpio_info: structure containing GPIO info for PWM timer | |
78 | * @bl_data: structure containing Backlight control data | |
79 | */ | |
4db17215 | 80 | void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info, |
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81 | struct platform_pwm_backlight_data *bl_data) |
82 | { | |
83 | int ret = 0; | |
84 | struct platform_device *samsung_bl_device; | |
85 | struct platform_pwm_backlight_data *samsung_bl_data; | |
86 | ||
87 | samsung_bl_device = kmemdup(&samsung_dfl_bl_device, | |
88 | sizeof(struct platform_device), GFP_KERNEL); | |
89 | if (!samsung_bl_device) { | |
90 | printk(KERN_ERR "%s: no memory for platform dev\n", __func__); | |
91 | return; | |
92 | } | |
93 | ||
94 | samsung_bl_data = s3c_set_platdata(&samsung_dfl_bl_data, | |
95 | sizeof(struct platform_pwm_backlight_data), samsung_bl_device); | |
96 | if (!samsung_bl_data) { | |
97 | printk(KERN_ERR "%s: no memory for platform dev\n", __func__); | |
98 | goto err_data; | |
99 | } | |
100 | ||
101 | /* Copy board specific data provided by user */ | |
102 | samsung_bl_data->pwm_id = bl_data->pwm_id; | |
103 | samsung_bl_device->dev.parent = | |
104 | &s3c_device_timer[samsung_bl_data->pwm_id].dev; | |
105 | ||
106 | if (bl_data->max_brightness) | |
107 | samsung_bl_data->max_brightness = bl_data->max_brightness; | |
108 | if (bl_data->dft_brightness) | |
109 | samsung_bl_data->dft_brightness = bl_data->dft_brightness; | |
110 | if (bl_data->lth_brightness) | |
111 | samsung_bl_data->lth_brightness = bl_data->lth_brightness; | |
112 | if (bl_data->pwm_period_ns) | |
113 | samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns; | |
114 | if (bl_data->init) | |
115 | samsung_bl_data->init = bl_data->init; | |
116 | if (bl_data->notify) | |
117 | samsung_bl_data->notify = bl_data->notify; | |
23747145 JH |
118 | if (bl_data->notify_after) |
119 | samsung_bl_data->notify_after = bl_data->notify_after; | |
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120 | if (bl_data->exit) |
121 | samsung_bl_data->exit = bl_data->exit; | |
122 | if (bl_data->check_fb) | |
123 | samsung_bl_data->check_fb = bl_data->check_fb; | |
124 | ||
125 | /* Keep the GPIO info for future use */ | |
126 | s3c_device_timer[samsung_bl_data->pwm_id].dev.platform_data = gpio_info; | |
127 | ||
128 | /* Register the specific PWM timer dev for Backlight control */ | |
129 | ret = platform_device_register( | |
130 | &s3c_device_timer[samsung_bl_data->pwm_id]); | |
131 | if (ret) { | |
132 | printk(KERN_ERR "failed to register pwm timer for backlight: %d\n", ret); | |
133 | goto err_plat_reg1; | |
134 | } | |
135 | ||
136 | /* Register the Backlight dev */ | |
137 | ret = platform_device_register(samsung_bl_device); | |
138 | if (ret) { | |
139 | printk(KERN_ERR "failed to register backlight device: %d\n", ret); | |
140 | goto err_plat_reg2; | |
141 | } | |
142 | ||
143 | return; | |
144 | ||
145 | err_plat_reg2: | |
146 | platform_device_unregister(&s3c_device_timer[samsung_bl_data->pwm_id]); | |
147 | err_plat_reg1: | |
148 | kfree(samsung_bl_data); | |
149 | err_data: | |
150 | kfree(samsung_bl_device); | |
151 | return; | |
152 | } |