diff options
author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2014-05-29 03:20:16 +0400 |
---|---|---|
committer | Nicolas Ferre <nicolas.ferre@atmel.com> | 2014-07-09 17:13:34 +0400 |
commit | ec38846ad59d7b780540afcec101b24139933195 (patch) | |
tree | 1279ea1224062da69953fc0140b658fc293261a2 /drivers/video/backlight | |
parent | 67c2b145cd5e3f74a901164d04d9ae19b1462906 (diff) | |
download | linux-ec38846ad59d7b780540afcec101b24139933195.tar.xz |
backlight: atmel-pwm-bl: remove obsolete driver
The atmel-pwm-bl driver is now obsolete. It is not used by any mainlined boards
and is replaced by the generic pwm_bl with the pawm-atmel driver using the
generic PWM framework.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r-- | drivers/video/backlight/Kconfig | 11 | ||||
-rw-r--r-- | drivers/video/backlight/Makefile | 1 | ||||
-rw-r--r-- | drivers/video/backlight/atmel-pwm-bl.c | 223 |
3 files changed, 0 insertions, 235 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 5d449059a556..c3c18339b8cb 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -178,17 +178,6 @@ config BACKLIGHT_ATMEL_LCDC If in doubt, it's safe to enable this option; it doesn't kick in unless the board's description says it's wired that way. -config BACKLIGHT_ATMEL_PWM - tristate "Atmel PWM backlight control" - depends on ATMEL_PWM - help - Say Y here if you want to use the PWM peripheral in Atmel AT91 and - AVR32 devices. This driver will need additional platform data to know - which PWM instance to use and how to configure it. - - To compile this driver as a module, choose M here: the module will be - called atmel-pwm-bl. - config BACKLIGHT_EP93XX tristate "Cirrus EP93xx Backlight Driver" depends on FB_EP93XX diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index bb820024f346..351451dbb607 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -25,7 +25,6 @@ obj-$(CONFIG_BACKLIGHT_ADP8860) += adp8860_bl.o obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o obj-$(CONFIG_BACKLIGHT_APPLE) += apple_bl.o obj-$(CONFIG_BACKLIGHT_AS3711) += as3711_bl.o -obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o obj-$(CONFIG_BACKLIGHT_BD6107) += bd6107.o obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c deleted file mode 100644 index 261b1a4ec3d8..000000000000 --- a/drivers/video/backlight/atmel-pwm-bl.c +++ /dev/null @@ -1,223 +0,0 @@ -/* - * Copyright (C) 2008 Atmel Corporation - * - * Backlight driver using Atmel PWM peripheral. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - */ -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/fb.h> -#include <linux/gpio.h> -#include <linux/backlight.h> -#include <linux/atmel_pwm.h> -#include <linux/atmel-pwm-bl.h> -#include <linux/slab.h> - -struct atmel_pwm_bl { - const struct atmel_pwm_bl_platform_data *pdata; - struct backlight_device *bldev; - struct platform_device *pdev; - struct pwm_channel pwmc; - int gpio_on; -}; - -static void atmel_pwm_bl_set_gpio_on(struct atmel_pwm_bl *pwmbl, int on) -{ - if (!gpio_is_valid(pwmbl->gpio_on)) - return; - - gpio_set_value(pwmbl->gpio_on, on ^ pwmbl->pdata->on_active_low); -} - -static int atmel_pwm_bl_set_intensity(struct backlight_device *bd) -{ - struct atmel_pwm_bl *pwmbl = bl_get_data(bd); - int intensity = bd->props.brightness; - int pwm_duty; - - if (bd->props.power != FB_BLANK_UNBLANK) - intensity = 0; - if (bd->props.fb_blank != FB_BLANK_UNBLANK) - intensity = 0; - - if (pwmbl->pdata->pwm_active_low) - pwm_duty = pwmbl->pdata->pwm_duty_min + intensity; - else - pwm_duty = pwmbl->pdata->pwm_duty_max - intensity; - - if (pwm_duty > pwmbl->pdata->pwm_duty_max) - pwm_duty = pwmbl->pdata->pwm_duty_max; - if (pwm_duty < pwmbl->pdata->pwm_duty_min) - pwm_duty = pwmbl->pdata->pwm_duty_min; - - if (!intensity) { - atmel_pwm_bl_set_gpio_on(pwmbl, 0); - pwm_channel_writel(&pwmbl->pwmc, PWM_CUPD, pwm_duty); - pwm_channel_disable(&pwmbl->pwmc); - } else { - pwm_channel_enable(&pwmbl->pwmc); - pwm_channel_writel(&pwmbl->pwmc, PWM_CUPD, pwm_duty); - atmel_pwm_bl_set_gpio_on(pwmbl, 1); - } - - return 0; -} - -static int atmel_pwm_bl_get_intensity(struct backlight_device *bd) -{ - struct atmel_pwm_bl *pwmbl = bl_get_data(bd); - u32 cdty; - u32 intensity; - - cdty = pwm_channel_readl(&pwmbl->pwmc, PWM_CDTY); - if (pwmbl->pdata->pwm_active_low) - intensity = cdty - pwmbl->pdata->pwm_duty_min; - else - intensity = pwmbl->pdata->pwm_duty_max - cdty; - - return intensity & 0xffff; -} - -static int atmel_pwm_bl_init_pwm(struct atmel_pwm_bl *pwmbl) -{ - unsigned long pwm_rate = pwmbl->pwmc.mck; - unsigned long prescale = DIV_ROUND_UP(pwm_rate, - (pwmbl->pdata->pwm_frequency * - pwmbl->pdata->pwm_compare_max)) - 1; - - /* - * Prescale must be power of two and maximum 0xf in size because of - * hardware limit. PWM speed will be: - * PWM module clock speed / (2 ^ prescale). - */ - prescale = fls(prescale); - if (prescale > 0xf) - prescale = 0xf; - - pwm_channel_writel(&pwmbl->pwmc, PWM_CMR, prescale); - pwm_channel_writel(&pwmbl->pwmc, PWM_CDTY, - pwmbl->pdata->pwm_duty_min + - pwmbl->bldev->props.brightness); - pwm_channel_writel(&pwmbl->pwmc, PWM_CPRD, - pwmbl->pdata->pwm_compare_max); - - dev_info(&pwmbl->pdev->dev, "Atmel PWM backlight driver (%lu Hz)\n", - pwmbl->pwmc.mck / pwmbl->pdata->pwm_compare_max / - (1 << prescale)); - - return pwm_channel_enable(&pwmbl->pwmc); -} - -static const struct backlight_ops atmel_pwm_bl_ops = { - .get_brightness = atmel_pwm_bl_get_intensity, - .update_status = atmel_pwm_bl_set_intensity, -}; - -static int atmel_pwm_bl_probe(struct platform_device *pdev) -{ - struct backlight_properties props; - const struct atmel_pwm_bl_platform_data *pdata; - struct backlight_device *bldev; - struct atmel_pwm_bl *pwmbl; - unsigned long flags; - int retval; - - pdata = dev_get_platdata(&pdev->dev); - if (!pdata) - return -ENODEV; - - if (pdata->pwm_compare_max < pdata->pwm_duty_max || - pdata->pwm_duty_min > pdata->pwm_duty_max || - pdata->pwm_frequency == 0) - return -EINVAL; - - pwmbl = devm_kzalloc(&pdev->dev, sizeof(struct atmel_pwm_bl), - GFP_KERNEL); - if (!pwmbl) - return -ENOMEM; - - pwmbl->pdev = pdev; - pwmbl->pdata = pdata; - pwmbl->gpio_on = pdata->gpio_on; - - retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc); - if (retval) - return retval; - - if (gpio_is_valid(pwmbl->gpio_on)) { - /* Turn display off by default. */ - if (pdata->on_active_low) - flags = GPIOF_OUT_INIT_HIGH; - else - flags = GPIOF_OUT_INIT_LOW; - - retval = devm_gpio_request_one(&pdev->dev, pwmbl->gpio_on, - flags, "gpio_atmel_pwm_bl"); - if (retval) - goto err_free_pwm; - } - - memset(&props, 0, sizeof(struct backlight_properties)); - props.type = BACKLIGHT_RAW; - props.max_brightness = pdata->pwm_duty_max - pdata->pwm_duty_min; - bldev = devm_backlight_device_register(&pdev->dev, "atmel-pwm-bl", - &pdev->dev, pwmbl, &atmel_pwm_bl_ops, - &props); - if (IS_ERR(bldev)) { - retval = PTR_ERR(bldev); - goto err_free_pwm; - } - - pwmbl->bldev = bldev; - - platform_set_drvdata(pdev, pwmbl); - - /* Power up the backlight by default at middle intesity. */ - bldev->props.power = FB_BLANK_UNBLANK; - bldev->props.brightness = bldev->props.max_brightness / 2; - - retval = atmel_pwm_bl_init_pwm(pwmbl); - if (retval) - goto err_free_pwm; - - atmel_pwm_bl_set_intensity(bldev); - - return 0; - -err_free_pwm: - pwm_channel_free(&pwmbl->pwmc); - - return retval; -} - -static int atmel_pwm_bl_remove(struct platform_device *pdev) -{ - struct atmel_pwm_bl *pwmbl = platform_get_drvdata(pdev); - - atmel_pwm_bl_set_gpio_on(pwmbl, 0); - pwm_channel_disable(&pwmbl->pwmc); - pwm_channel_free(&pwmbl->pwmc); - - return 0; -} - -static struct platform_driver atmel_pwm_bl_driver = { - .driver = { - .name = "atmel-pwm-bl", - }, - /* REVISIT add suspend() and resume() */ - .probe = atmel_pwm_bl_probe, - .remove = atmel_pwm_bl_remove, -}; - -module_platform_driver(atmel_pwm_bl_driver); - -MODULE_AUTHOR("Hans-Christian egtvedt <hans-christian.egtvedt@atmel.com>"); -MODULE_DESCRIPTION("Atmel PWM backlight driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:atmel-pwm-bl"); |