cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dev-backlight-s3c64xx.c (4174B)

      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
      7
      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>
     13
     14#include "devs.h"
     15#include "gpio-cfg.h"
     16
     17#include "backlight-s3c64xx.h"
     18
     19struct samsung_bl_drvdata {
     20	struct platform_pwm_backlight_data plat_data;
     21	struct samsung_bl_gpio_info *gpio_info;
     22};
     23
     24static int samsung_bl_init(struct device *dev)
     25{
     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;
     31
     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;
     36	}
     37
     38	/* Configure GPIO pin with specific GPIO function for PWM timer */
     39	s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func);
     40
     41	return 0;
     42}
     43
     44static void samsung_bl_exit(struct device *dev)
     45{
     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;
     50
     51	s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT);
     52	gpio_free(bl_gpio_info->no);
     53}
     54
     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
     62 */
     63
     64static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = {
     65	.plat_data = {
     66		.max_brightness = 255,
     67		.dft_brightness = 255,
     68		.init           = samsung_bl_init,
     69		.exit           = samsung_bl_exit,
     70	},
     71};
     72
     73static struct platform_device samsung_dfl_bl_device __initdata = {
     74	.name		= "pwm-backlight",
     75};
     76
     77/* samsung_bl_set - Set board specific data (if any) provided by user for
     78 * PWM Backlight control and register specific PWM and backlight device.
     79 * @gpio_info:	structure containing GPIO info for PWM timer
     80 * @bl_data:	structure containing Backlight control data
     81 */
     82void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info,
     83	struct platform_pwm_backlight_data *bl_data)
     84{
     85	int ret = 0;
     86	struct platform_device *samsung_bl_device;
     87	struct samsung_bl_drvdata *samsung_bl_drvdata;
     88	struct platform_pwm_backlight_data *samsung_bl_data;
     89
     90	samsung_bl_device = kmemdup(&samsung_dfl_bl_device,
     91			sizeof(struct platform_device), GFP_KERNEL);
     92	if (!samsung_bl_device)
     93		return;
     94
     95	samsung_bl_drvdata = kmemdup(&samsung_dfl_bl_data,
     96				sizeof(samsung_dfl_bl_data), GFP_KERNEL);
     97	if (!samsung_bl_drvdata)
     98		goto err_data;
     99
    100	samsung_bl_device->dev.platform_data = &samsung_bl_drvdata->plat_data;
    101	samsung_bl_drvdata->gpio_info = gpio_info;
    102	samsung_bl_data = &samsung_bl_drvdata->plat_data;
    103
    104	/* Copy board specific data provided by user */
    105	samsung_bl_device->dev.parent = &samsung_device_pwm.dev;
    106
    107	if (bl_data->max_brightness)
    108		samsung_bl_data->max_brightness = bl_data->max_brightness;
    109	if (bl_data->dft_brightness)
    110		samsung_bl_data->dft_brightness = bl_data->dft_brightness;
    111	if (bl_data->lth_brightness)
    112		samsung_bl_data->lth_brightness = bl_data->lth_brightness;
    113	if (bl_data->init)
    114		samsung_bl_data->init = bl_data->init;
    115	if (bl_data->notify)
    116		samsung_bl_data->notify = bl_data->notify;
    117	if (bl_data->notify_after)
    118		samsung_bl_data->notify_after = bl_data->notify_after;
    119	if (bl_data->exit)
    120		samsung_bl_data->exit = bl_data->exit;
    121	if (bl_data->check_fb)
    122		samsung_bl_data->check_fb = bl_data->check_fb;
    123
    124	/* Register the Backlight dev */
    125	ret = platform_device_register(samsung_bl_device);
    126	if (ret) {
    127		printk(KERN_ERR "failed to register backlight device: %d\n", ret);
    128		goto err_plat_reg2;
    129	}
    130
    131	return;
    132
    133err_plat_reg2:
    134	kfree(samsung_bl_data);
    135err_data:
    136	kfree(samsung_bl_device);
    137}