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a4406f165f
The pwm-backlight driver is moving to use the gpiod interface, which has its own mapping mechanism for platform data GPIOs. These mappings carry GPIO properties like active low so they don't have to be explicitly handled by GPIO consumers. Because of this change, the enable_gpio_flags member of platform_pwm_backlight_data is going away. dev-backlight was passing this member, but had no user making use of it, so it can safely be removed. Further GPIOs used by pwm-backlight are expected to be defined using the mechanisms provided by the gpiod API. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
/* linux/arch/arm/plat-samsung/dev-backlight.c
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*
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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 <plat/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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.pwm_period_ns = 78770,
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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_data->pwm_id = bl_data->pwm_id;
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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->pwm_period_ns)
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samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns;
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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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