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148 lines
4.5 KiB
148 lines
4.5 KiB
/* |
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* Copyright (c) 2011 Samsung Electronics Co., Ltd. |
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* http://www.samsung.com |
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* |
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* Common infrastructure for PWM Backlight for Samsung boards |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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*/ |
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#include <linux/gpio.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/pwm_backlight.h> |
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#include <plat/devs.h> |
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#include <plat/gpio-cfg.h> |
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#include "backlight.h" |
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struct samsung_bl_drvdata { |
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struct platform_pwm_backlight_data plat_data; |
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struct samsung_bl_gpio_info *gpio_info; |
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}; |
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static int samsung_bl_init(struct device *dev) |
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{ |
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int ret = 0; |
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struct platform_pwm_backlight_data *pdata = dev->platform_data; |
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struct samsung_bl_drvdata *drvdata = container_of(pdata, |
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struct samsung_bl_drvdata, plat_data); |
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struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info; |
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ret = gpio_request(bl_gpio_info->no, "Backlight"); |
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if (ret) { |
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printk(KERN_ERR "failed to request GPIO for LCD Backlight\n"); |
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return ret; |
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} |
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/* Configure GPIO pin with specific GPIO function for PWM timer */ |
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s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func); |
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return 0; |
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} |
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static void samsung_bl_exit(struct device *dev) |
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{ |
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struct platform_pwm_backlight_data *pdata = dev->platform_data; |
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struct samsung_bl_drvdata *drvdata = container_of(pdata, |
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struct samsung_bl_drvdata, plat_data); |
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struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info; |
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s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT); |
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gpio_free(bl_gpio_info->no); |
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} |
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/* Initialize few important fields of platform_pwm_backlight_data |
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* structure with default values. These fields can be overridden by |
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* board-specific values sent from machine file. |
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* For ease of operation, these fields are initialized with values |
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* used by most samsung boards. |
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* Users has the option of sending info about other parameters |
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* for their specific boards |
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*/ |
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static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = { |
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.plat_data = { |
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.max_brightness = 255, |
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.dft_brightness = 255, |
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.enable_gpio = -1, |
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.init = samsung_bl_init, |
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.exit = samsung_bl_exit, |
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}, |
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}; |
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static struct platform_device samsung_dfl_bl_device __initdata = { |
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.name = "pwm-backlight", |
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}; |
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/* samsung_bl_set - Set board specific data (if any) provided by user for |
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* PWM Backlight control and register specific PWM and backlight device. |
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* @gpio_info: structure containing GPIO info for PWM timer |
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* @bl_data: structure containing Backlight control data |
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*/ |
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void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info, |
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struct platform_pwm_backlight_data *bl_data) |
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{ |
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int ret = 0; |
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struct platform_device *samsung_bl_device; |
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struct samsung_bl_drvdata *samsung_bl_drvdata; |
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struct platform_pwm_backlight_data *samsung_bl_data; |
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samsung_bl_device = kmemdup(&samsung_dfl_bl_device, |
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sizeof(struct platform_device), GFP_KERNEL); |
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if (!samsung_bl_device) { |
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printk(KERN_ERR "%s: no memory for platform dev\n", __func__); |
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return; |
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} |
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samsung_bl_drvdata = kmemdup(&samsung_dfl_bl_data, |
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sizeof(samsung_dfl_bl_data), GFP_KERNEL); |
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if (!samsung_bl_drvdata) { |
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printk(KERN_ERR "%s: no memory for platform dev\n", __func__); |
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goto err_data; |
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} |
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samsung_bl_device->dev.platform_data = &samsung_bl_drvdata->plat_data; |
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samsung_bl_drvdata->gpio_info = gpio_info; |
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samsung_bl_data = &samsung_bl_drvdata->plat_data; |
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/* Copy board specific data provided by user */ |
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samsung_bl_device->dev.parent = &samsung_device_pwm.dev; |
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if (bl_data->max_brightness) |
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samsung_bl_data->max_brightness = bl_data->max_brightness; |
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if (bl_data->dft_brightness) |
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samsung_bl_data->dft_brightness = bl_data->dft_brightness; |
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if (bl_data->lth_brightness) |
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samsung_bl_data->lth_brightness = bl_data->lth_brightness; |
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if (bl_data->enable_gpio >= 0) |
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samsung_bl_data->enable_gpio = bl_data->enable_gpio; |
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if (bl_data->init) |
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samsung_bl_data->init = bl_data->init; |
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if (bl_data->notify) |
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samsung_bl_data->notify = bl_data->notify; |
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if (bl_data->notify_after) |
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samsung_bl_data->notify_after = bl_data->notify_after; |
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if (bl_data->exit) |
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samsung_bl_data->exit = bl_data->exit; |
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if (bl_data->check_fb) |
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samsung_bl_data->check_fb = bl_data->check_fb; |
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/* Register the Backlight dev */ |
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ret = platform_device_register(samsung_bl_device); |
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if (ret) { |
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printk(KERN_ERR "failed to register backlight device: %d\n", ret); |
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goto err_plat_reg2; |
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} |
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return; |
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err_plat_reg2: |
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kfree(samsung_bl_data); |
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err_data: |
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kfree(samsung_bl_device); |
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return; |
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}
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