fbdev: display class (2ee12163) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/video/Kconfig

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		@@ -5,6 +5,7 @@
		menu "Graphics support"

		source "drivers/video/backlight/Kconfig"
		source "drivers/video/display/Kconfig"

		config FB
		tristate "Support for frame buffer devices"

drivers/video/Makefile

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		@@ -12,7 +12,7 @@ fb-objs := $(fb-y)

		obj-$(CONFIG_VT) += console/
		obj-$(CONFIG_LOGO) += logo/
		obj-y += backlight/
		obj-y += backlight/ display/

		obj-$(CONFIG_FB_CFB_FILLRECT) += cfbfillrect.o
		obj-$(CONFIG_FB_CFB_COPYAREA) += cfbcopyarea.o

drivers/video/display/Kconfig

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		#
		# Display drivers configuration
		#

		menu "Display device support"

		config DISPLAY_SUPPORT
		tristate "Display panel/monitor support"
		---help---
		This framework adds support for low-level control of a display.
		This includes support for power.

		Enable this to be able to choose the drivers for controlling the
		physical display panel/monitor on some platforms. This not only
		covers LCD displays for PDAs but also other types of displays
		such as CRT, TVout etc.

		To have support for your specific display panel you will have to
		select the proper drivers which depend on this option.

		comment "Display hardware drivers"
		depends on DISPLAY_SUPPORT

		endmenu

drivers/video/display/Makefile

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		# Display drivers

		display-objs := display-sysfs.o

		obj-$(CONFIG_DISPLAY_SUPPORT) += display.o

drivers/video/display/display-sysfs.c

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		/*
		* display-sysfs.c - Display output driver sysfs interface
		*
		* Copyright (C) 2007 James Simmons <jsimmons@infradead.org>
		*
		* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or (at
		* your option) any later version.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License along
		* with this program; if not, write to the Free Software Foundation, Inc.,
		* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
		*
		* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
		*/
		#include <linux/module.h>
		#include <linux/display.h>
		#include <linux/ctype.h>
		#include <linux/idr.h>
		#include <linux/err.h>

		static ssize_t display_show_name(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct display_device *dsp = dev_get_drvdata(dev);
		return snprintf(buf, PAGE_SIZE, "%s\n", dsp->name);
		}

		static ssize_t display_show_type(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct display_device *dsp = dev_get_drvdata(dev);
		return snprintf(buf, PAGE_SIZE, "%s\n", dsp->type);
		}

		static ssize_t display_show_contrast(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct display_device *dsp = dev_get_drvdata(dev);
		ssize_t rc = -ENXIO;

		mutex_lock(&dsp->lock);
		if (likely(dsp->driver) && dsp->driver->get_contrast)
		rc = sprintf(buf, "%d\n", dsp->driver->get_contrast(dsp));
		mutex_unlock(&dsp->lock);
		return rc;
		}

		static ssize_t display_store_contrast(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
		{
		struct display_device *dsp = dev_get_drvdata(dev);
		ssize_t ret = -EINVAL, size;
		int contrast;
		char *endp;

		contrast = simple_strtoul(buf, &endp, 0);
		size = endp - buf;

		if (endp && isspace(endp))
		size++;

		if (size != count)
		return ret;

		mutex_lock(&dsp->lock);
		if (likely(dsp->driver && dsp->driver->set_contrast)) {
		pr_debug("display: set contrast to %d\n", contrast);
		dsp->driver->set_contrast(dsp, contrast);
		ret = count;
		}
		mutex_unlock(&dsp->lock);
		return ret;
		}

		static ssize_t display_show_max_contrast(struct device *dev,
		struct device_attribute *attr,
		char *buf)
		{
		struct display_device *dsp = dev_get_drvdata(dev);
		ssize_t rc = -ENXIO;

		mutex_lock(&dsp->lock);
		if (likely(dsp->driver))
		rc = sprintf(buf, "%d\n", dsp->driver->max_contrast);
		mutex_unlock(&dsp->lock);
		return rc;
		}

		static struct device_attribute display_attrs[] = {
		__ATTR(name, S_IRUGO, display_show_name, NULL),
		__ATTR(type, S_IRUGO, display_show_type, NULL),
		__ATTR(contrast, S_IRUGO \| S_IWUSR, display_show_contrast, display_store_contrast),
		__ATTR(max_contrast, S_IRUGO, display_show_max_contrast, NULL),
		};

		static int display_suspend(struct device *dev, pm_message_t state)
		{
		struct display_device *dsp = dev_get_drvdata(dev);

		mutex_lock(&dsp->lock);
		if (likely(dsp->driver->suspend))
		dsp->driver->suspend(dsp, state);
		mutex_unlock(&dsp->lock);
		return 0;
		};

		static int display_resume(struct device *dev)
		{
		struct display_device *dsp = dev_get_drvdata(dev);

		mutex_lock(&dsp->lock);
		if (likely(dsp->driver->resume))
		dsp->driver->resume(dsp);
		mutex_unlock(&dsp->lock);
		return 0;
		};

		static struct mutex allocated_dsp_lock;
		static DEFINE_IDR(allocated_dsp);
		struct class *display_class;

		struct display_device display_device_register(struct display_driver driver,
		struct device parent, void devdata)
		{
		struct display_device *new_dev = NULL;
		int ret = -EINVAL;

		if (unlikely(!driver))
		return ERR_PTR(ret);

		mutex_lock(&allocated_dsp_lock);
		ret = idr_pre_get(&allocated_dsp, GFP_KERNEL);
		mutex_unlock(&allocated_dsp_lock);
		if (!ret)
		return ERR_PTR(ret);

		new_dev = kzalloc(sizeof(struct display_device), GFP_KERNEL);
		if (likely(new_dev) && unlikely(driver->probe(new_dev, devdata))) {
		// Reserve the index for this display
		mutex_lock(&allocated_dsp_lock);
		ret = idr_get_new(&allocated_dsp, new_dev, &new_dev->idx);
		mutex_unlock(&allocated_dsp_lock);

		if (!ret) {
		new_dev->dev = device_create(display_class, parent, 0,
		"display%d", new_dev->idx);
		if (!IS_ERR(new_dev->dev)) {
		dev_set_drvdata(new_dev->dev, new_dev);
		new_dev->parent = parent;
		new_dev->driver = driver;
		mutex_init(&new_dev->lock);
		return new_dev;
		}
		mutex_lock(&allocated_dsp_lock);
		idr_remove(&allocated_dsp, new_dev->idx);
		mutex_unlock(&allocated_dsp_lock);
		ret = -EINVAL;
		}
		}
		kfree(new_dev);
		return ERR_PTR(ret);
		}
		EXPORT_SYMBOL(display_device_register);

		void display_device_unregister(struct display_device *ddev)
		{
		if (!ddev)
		return;
		// Free device
		mutex_lock(&ddev->lock);
		device_unregister(ddev->dev);
		mutex_unlock(&ddev->lock);
		// Mark device index as avaliable
		mutex_lock(&allocated_dsp_lock);
		idr_remove(&allocated_dsp, ddev->idx);
		mutex_unlock(&allocated_dsp_lock);
		kfree(ddev);
		}
		EXPORT_SYMBOL(display_device_unregister);

		static int __init display_class_init(void)
		{
		display_class = class_create(THIS_MODULE, "display");
		if (IS_ERR(display_class)) {
		printk(KERN_ERR "Failed to create display class\n");
		display_class = NULL;
		return -EINVAL;
		}
		display_class->dev_attrs = display_attrs;
		display_class->suspend = display_suspend;
		display_class->resume = display_resume;
		mutex_init(&allocated_dsp_lock);
		return 0;
		}

		static void __exit display_class_exit(void)
		{
		class_destroy(display_class);
		}

		module_init(display_class_init);
		module_exit(display_class_exit);

		MODULE_DESCRIPTION("Display Hardware handling");
		MODULE_AUTHOR("James Simmons <jsimmons@infradead.org>");
		MODULE_LICENSE("GPL");