arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / arm / mach-s3c64xx / dev-backlight.c
blob799cfdf0606b300ca11cb493bcc511d7ccd81bff
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 // http://www.samsung.com
5 //
6 // Common infrastructure for PWM Backlight for Samsung boards
8 #include <linux/gpio.h>
9 #include <linux/platform_device.h>
10 #include <linux/slab.h>
11 #include <linux/io.h>
12 #include <linux/pwm_backlight.h>
14 #include <plat/devs.h>
15 #include <plat/gpio-cfg.h>
17 #include "backlight.h"
19 struct samsung_bl_drvdata {
20 struct platform_pwm_backlight_data plat_data;
21 struct samsung_bl_gpio_info *gpio_info;
24 static int samsung_bl_init(struct device *dev)
26 int ret = 0;
27 struct platform_pwm_backlight_data *pdata = dev->platform_data;
28 struct samsung_bl_drvdata *drvdata = container_of(pdata,
29 struct samsung_bl_drvdata, plat_data);
30 struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info;
32 ret = gpio_request(bl_gpio_info->no, "Backlight");
33 if (ret) {
34 printk(KERN_ERR "failed to request GPIO for LCD Backlight\n");
35 return ret;
38 /* Configure GPIO pin with specific GPIO function for PWM timer */
39 s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func);
41 return 0;
44 static void samsung_bl_exit(struct device *dev)
46 struct platform_pwm_backlight_data *pdata = dev->platform_data;
47 struct samsung_bl_drvdata *drvdata = container_of(pdata,
48 struct samsung_bl_drvdata, plat_data);
49 struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info;
51 s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT);
52 gpio_free(bl_gpio_info->no);
55 /* Initialize few important fields of platform_pwm_backlight_data
56 * structure with default values. These fields can be overridden by
57 * board-specific values sent from machine file.
58 * For ease of operation, these fields are initialized with values
59 * used by most samsung boards.
60 * Users has the option of sending info about other parameters
61 * for their specific boards
64 static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = {
65 .plat_data = {
66 .max_brightness = 255,
67 .dft_brightness = 255,
68 .enable_gpio = -1,
69 .init = samsung_bl_init,
70 .exit = samsung_bl_exit,
74 static struct platform_device samsung_dfl_bl_device __initdata = {
75 .name = "pwm-backlight",
78 /* samsung_bl_set - Set board specific data (if any) provided by user for
79 * PWM Backlight control and register specific PWM and backlight device.
80 * @gpio_info: structure containing GPIO info for PWM timer
81 * @bl_data: structure containing Backlight control data
83 void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info,
84 struct platform_pwm_backlight_data *bl_data)
86 int ret = 0;
87 struct platform_device *samsung_bl_device;
88 struct samsung_bl_drvdata *samsung_bl_drvdata;
89 struct platform_pwm_backlight_data *samsung_bl_data;
91 samsung_bl_device = kmemdup(&samsung_dfl_bl_device,
92 sizeof(struct platform_device), GFP_KERNEL);
93 if (!samsung_bl_device)
94 return;
96 samsung_bl_drvdata = kmemdup(&samsung_dfl_bl_data,
97 sizeof(samsung_dfl_bl_data), GFP_KERNEL);
98 if (!samsung_bl_drvdata)
99 goto err_data;
101 samsung_bl_device->dev.platform_data = &samsung_bl_drvdata->plat_data;
102 samsung_bl_drvdata->gpio_info = gpio_info;
103 samsung_bl_data = &samsung_bl_drvdata->plat_data;
105 /* Copy board specific data provided by user */
106 samsung_bl_device->dev.parent = &samsung_device_pwm.dev;
108 if (bl_data->max_brightness)
109 samsung_bl_data->max_brightness = bl_data->max_brightness;
110 if (bl_data->dft_brightness)
111 samsung_bl_data->dft_brightness = bl_data->dft_brightness;
112 if (bl_data->lth_brightness)
113 samsung_bl_data->lth_brightness = bl_data->lth_brightness;
114 if (bl_data->enable_gpio >= 0)
115 samsung_bl_data->enable_gpio = bl_data->enable_gpio;
116 if (bl_data->init)
117 samsung_bl_data->init = bl_data->init;
118 if (bl_data->notify)
119 samsung_bl_data->notify = bl_data->notify;
120 if (bl_data->notify_after)
121 samsung_bl_data->notify_after = bl_data->notify_after;
122 if (bl_data->exit)
123 samsung_bl_data->exit = bl_data->exit;
124 if (bl_data->check_fb)
125 samsung_bl_data->check_fb = bl_data->check_fb;
127 /* Register the Backlight dev */
128 ret = platform_device_register(samsung_bl_device);
129 if (ret) {
130 printk(KERN_ERR "failed to register backlight device: %d\n", ret);
131 goto err_plat_reg2;
134 return;
136 err_plat_reg2:
137 kfree(samsung_bl_data);
138 err_data:
139 kfree(samsung_bl_device);