1f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami/* linux/arch/arm/plat-samsung/dev-backlight.c 2f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * 3f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * http://www.samsung.com 5f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * 6f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * Common infrastructure for PWM Backlight for Samsung boards 7f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * 8f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * This program is free software; you can redistribute it and/or modify 9f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * it under the terms of the GNU General Public License version 2 as 10f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * published by the Free Software Foundation. 11f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami */ 12f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 13f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <linux/gpio.h> 14f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <linux/platform_device.h> 153d46cceb6082bcc08290365f21043faf342a928aPaul Gortmaker#include <linux/slab.h> 16f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <linux/io.h> 17f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <linux/pwm_backlight.h> 18f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 19f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <plat/devs.h> 20f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <plat/gpio-cfg.h> 21f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami#include <plat/backlight.h> 22f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 23f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamistatic int samsung_bl_init(struct device *dev) 24f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami{ 25f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami int ret = 0; 26f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct platform_device *timer_dev = 27f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami container_of(dev->parent, struct platform_device, dev); 28f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct samsung_bl_gpio_info *bl_gpio_info = 29f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami timer_dev->dev.platform_data; 30f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 31f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami ret = gpio_request(bl_gpio_info->no, "Backlight"); 32f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (ret) { 33f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami printk(KERN_ERR "failed to request GPIO for LCD Backlight\n"); 34f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami return ret; 35f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami } 36f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 37f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami /* Configure GPIO pin with specific GPIO function for PWM timer */ 38f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func); 39f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 40f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami return 0; 41f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami} 42f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 43f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamistatic void samsung_bl_exit(struct device *dev) 44f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami{ 45f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct platform_device *timer_dev = 46f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami container_of(dev->parent, struct platform_device, dev); 47f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct samsung_bl_gpio_info *bl_gpio_info = 48f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami timer_dev->dev.platform_data; 49f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 50f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT); 51f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami gpio_free(bl_gpio_info->no); 52f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami} 53f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 54f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami/* Initialize few important fields of platform_pwm_backlight_data 55f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * structure with default values. These fields can be overridden by 56f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * board-specific values sent from machine file. 57f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * For ease of operation, these fields are initialized with values 58f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * used by most samsung boards. 59f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * Users has the option of sending info about other parameters 60f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * for their specific boards 61f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami */ 62f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 63f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamistatic struct platform_pwm_backlight_data samsung_dfl_bl_data __initdata = { 64f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami .max_brightness = 255, 65f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami .dft_brightness = 255, 66f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami .pwm_period_ns = 78770, 67f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami .init = samsung_bl_init, 68f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami .exit = samsung_bl_exit, 69f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami}; 70f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 71f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamistatic struct platform_device samsung_dfl_bl_device __initdata = { 72f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami .name = "pwm-backlight", 73f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami}; 74f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 75f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami/* samsung_bl_set - Set board specific data (if any) provided by user for 76f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * PWM Backlight control and register specific PWM and backlight device. 77f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * @gpio_info: structure containing GPIO info for PWM timer 78f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami * @bl_data: structure containing Backlight control data 79f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami */ 804db17215da33940e4c594c1152ce765c5506a621Tushar Beheravoid __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info, 81f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct platform_pwm_backlight_data *bl_data) 82f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami{ 83f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami int ret = 0; 84f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct platform_device *samsung_bl_device; 85f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami struct platform_pwm_backlight_data *samsung_bl_data; 86f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 87f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_device = kmemdup(&samsung_dfl_bl_device, 88f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami sizeof(struct platform_device), GFP_KERNEL); 89f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (!samsung_bl_device) { 90f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami printk(KERN_ERR "%s: no memory for platform dev\n", __func__); 91f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami return; 92f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami } 93f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 94f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data = s3c_set_platdata(&samsung_dfl_bl_data, 95f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami sizeof(struct platform_pwm_backlight_data), samsung_bl_device); 96f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (!samsung_bl_data) { 97f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami printk(KERN_ERR "%s: no memory for platform dev\n", __func__); 98f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami goto err_data; 99f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami } 100f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 101f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami /* Copy board specific data provided by user */ 102f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->pwm_id = bl_data->pwm_id; 103f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_device->dev.parent = 104f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami &s3c_device_timer[samsung_bl_data->pwm_id].dev; 105f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 106f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->max_brightness) 107f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->max_brightness = bl_data->max_brightness; 108f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->dft_brightness) 109f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->dft_brightness = bl_data->dft_brightness; 110f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->lth_brightness) 111f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->lth_brightness = bl_data->lth_brightness; 112f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->pwm_period_ns) 113f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns; 114f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->init) 115f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->init = bl_data->init; 116f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->notify) 117f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->notify = bl_data->notify; 11823747145070779682ccdf948b786adaf88b2a89eJingoo Han if (bl_data->notify_after) 11923747145070779682ccdf948b786adaf88b2a89eJingoo Han samsung_bl_data->notify_after = bl_data->notify_after; 120f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->exit) 121f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->exit = bl_data->exit; 122f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (bl_data->check_fb) 123f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami samsung_bl_data->check_fb = bl_data->check_fb; 124f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 125f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami /* Keep the GPIO info for future use */ 126f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami s3c_device_timer[samsung_bl_data->pwm_id].dev.platform_data = gpio_info; 127f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 128f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami /* Register the specific PWM timer dev for Backlight control */ 129f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami ret = platform_device_register( 130f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami &s3c_device_timer[samsung_bl_data->pwm_id]); 131f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (ret) { 132f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami printk(KERN_ERR "failed to register pwm timer for backlight: %d\n", ret); 133f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami goto err_plat_reg1; 134f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami } 135f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 136f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami /* Register the Backlight dev */ 137f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami ret = platform_device_register(samsung_bl_device); 138f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami if (ret) { 139f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami printk(KERN_ERR "failed to register backlight device: %d\n", ret); 140f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami goto err_plat_reg2; 141f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami } 142f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 143f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami return; 144f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami 145f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamierr_plat_reg2: 146f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami platform_device_unregister(&s3c_device_timer[samsung_bl_data->pwm_id]); 147f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamierr_plat_reg1: 148f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami kfree(samsung_bl_data); 149f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswamierr_data: 150f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami kfree(samsung_bl_device); 151f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami return; 152f00207b255f59ebedc5965c2ab0bd1cefae70f92Banajit Goswami} 153