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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 | ||
d1a8d3cc TF |
23 | struct samsung_bl_drvdata { |
24 | struct platform_pwm_backlight_data plat_data; | |
25 | struct samsung_bl_gpio_info *gpio_info; | |
26 | }; | |
27 | ||
f00207b2 BG |
28 | static int samsung_bl_init(struct device *dev) |
29 | { | |
30 | int ret = 0; | |
d1a8d3cc TF |
31 | struct platform_pwm_backlight_data *pdata = dev->platform_data; |
32 | struct samsung_bl_drvdata *drvdata = container_of(pdata, | |
33 | struct samsung_bl_drvdata, plat_data); | |
34 | struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info; | |
f00207b2 BG |
35 | |
36 | ret = gpio_request(bl_gpio_info->no, "Backlight"); | |
37 | if (ret) { | |
38 | printk(KERN_ERR "failed to request GPIO for LCD Backlight\n"); | |
39 | return ret; | |
40 | } | |
41 | ||
42 | /* Configure GPIO pin with specific GPIO function for PWM timer */ | |
43 | s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func); | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | static void samsung_bl_exit(struct device *dev) | |
49 | { | |
d1a8d3cc TF |
50 | struct platform_pwm_backlight_data *pdata = dev->platform_data; |
51 | struct samsung_bl_drvdata *drvdata = container_of(pdata, | |
52 | struct samsung_bl_drvdata, plat_data); | |
53 | struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info; | |
f00207b2 BG |
54 | |
55 | s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT); | |
56 | gpio_free(bl_gpio_info->no); | |
57 | } | |
58 | ||
59 | /* Initialize few important fields of platform_pwm_backlight_data | |
60 | * structure with default values. These fields can be overridden by | |
61 | * board-specific values sent from machine file. | |
62 | * For ease of operation, these fields are initialized with values | |
63 | * used by most samsung boards. | |
64 | * Users has the option of sending info about other parameters | |
65 | * for their specific boards | |
66 | */ | |
67 | ||
d1a8d3cc TF |
68 | static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = { |
69 | .plat_data = { | |
70 | .max_brightness = 255, | |
71 | .dft_brightness = 255, | |
72 | .pwm_period_ns = 78770, | |
a63652f1 | 73 | .enable_gpio = -1, |
d1a8d3cc TF |
74 | .init = samsung_bl_init, |
75 | .exit = samsung_bl_exit, | |
76 | }, | |
f00207b2 BG |
77 | }; |
78 | ||
79 | static struct platform_device samsung_dfl_bl_device __initdata = { | |
80 | .name = "pwm-backlight", | |
81 | }; | |
82 | ||
83 | /* samsung_bl_set - Set board specific data (if any) provided by user for | |
84 | * PWM Backlight control and register specific PWM and backlight device. | |
85 | * @gpio_info: structure containing GPIO info for PWM timer | |
86 | * @bl_data: structure containing Backlight control data | |
87 | */ | |
4db17215 | 88 | void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info, |
f00207b2 BG |
89 | struct platform_pwm_backlight_data *bl_data) |
90 | { | |
91 | int ret = 0; | |
92 | struct platform_device *samsung_bl_device; | |
d1a8d3cc | 93 | struct samsung_bl_drvdata *samsung_bl_drvdata; |
f00207b2 BG |
94 | struct platform_pwm_backlight_data *samsung_bl_data; |
95 | ||
96 | samsung_bl_device = kmemdup(&samsung_dfl_bl_device, | |
97 | sizeof(struct platform_device), GFP_KERNEL); | |
98 | if (!samsung_bl_device) { | |
99 | printk(KERN_ERR "%s: no memory for platform dev\n", __func__); | |
100 | return; | |
101 | } | |
102 | ||
d1a8d3cc TF |
103 | samsung_bl_drvdata = kmemdup(&samsung_dfl_bl_data, |
104 | sizeof(samsung_dfl_bl_data), GFP_KERNEL); | |
105 | if (!samsung_bl_drvdata) { | |
f00207b2 BG |
106 | printk(KERN_ERR "%s: no memory for platform dev\n", __func__); |
107 | goto err_data; | |
108 | } | |
d1a8d3cc TF |
109 | samsung_bl_device->dev.platform_data = &samsung_bl_drvdata->plat_data; |
110 | samsung_bl_drvdata->gpio_info = gpio_info; | |
111 | samsung_bl_data = &samsung_bl_drvdata->plat_data; | |
f00207b2 BG |
112 | |
113 | /* Copy board specific data provided by user */ | |
114 | samsung_bl_data->pwm_id = bl_data->pwm_id; | |
d1a8d3cc | 115 | samsung_bl_device->dev.parent = &samsung_device_pwm.dev; |
f00207b2 BG |
116 | |
117 | if (bl_data->max_brightness) | |
118 | samsung_bl_data->max_brightness = bl_data->max_brightness; | |
119 | if (bl_data->dft_brightness) | |
120 | samsung_bl_data->dft_brightness = bl_data->dft_brightness; | |
121 | if (bl_data->lth_brightness) | |
122 | samsung_bl_data->lth_brightness = bl_data->lth_brightness; | |
123 | if (bl_data->pwm_period_ns) | |
124 | samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns; | |
a63652f1 TR |
125 | if (bl_data->enable_gpio >= 0) |
126 | samsung_bl_data->enable_gpio = bl_data->enable_gpio; | |
f00207b2 BG |
127 | if (bl_data->init) |
128 | samsung_bl_data->init = bl_data->init; | |
129 | if (bl_data->notify) | |
130 | samsung_bl_data->notify = bl_data->notify; | |
23747145 JH |
131 | if (bl_data->notify_after) |
132 | samsung_bl_data->notify_after = bl_data->notify_after; | |
f00207b2 BG |
133 | if (bl_data->exit) |
134 | samsung_bl_data->exit = bl_data->exit; | |
135 | if (bl_data->check_fb) | |
136 | samsung_bl_data->check_fb = bl_data->check_fb; | |
137 | ||
f00207b2 BG |
138 | /* Register the Backlight dev */ |
139 | ret = platform_device_register(samsung_bl_device); | |
140 | if (ret) { | |
141 | printk(KERN_ERR "failed to register backlight device: %d\n", ret); | |
142 | goto err_plat_reg2; | |
143 | } | |
144 | ||
145 | return; | |
146 | ||
147 | err_plat_reg2: | |
f00207b2 BG |
148 | kfree(samsung_bl_data); |
149 | err_data: | |
150 | kfree(samsung_bl_device); | |
151 | return; | |
152 | } |