[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / fbsysfs.c

/*
 * fbsysfs.c - framebuffer device class and attributes
 *
 * Copyright (c) 2004 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.
 */

/*
 * Note:  currently there's only stubs for framebuffer_alloc and
 * framebuffer_release here.  The reson for that is that until all drivers
 * are converted to use it a sysfsification will open OOPSable races.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/module.h>

#define FB_SYSFS_FLAG_ATTR 1

/**
 * framebuffer_alloc - creates a new frame buffer info structure
 *
 * @size: size of driver private data, can be zero
 * @dev: pointer to the device for this fb, this can be NULL
 *
 * Creates a new frame buffer info structure. Also reserves @size bytes
 * for driver private data (info->par). info->par (if any) will be
 * aligned to sizeof(long).
 *
 * Returns the new structure, or NULL if an error occured.
 *
 */
struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
{
#define BYTES_PER_LONG (BITS_PER_LONG/8)
#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
	int fb_info_size = sizeof(struct fb_info);
	struct fb_info *info;
	char *p;

	if (size)
		fb_info_size += PADDING;

	p = kzalloc(fb_info_size + size, GFP_KERNEL);

	if (!p)
		return NULL;

	info = (struct fb_info *) p;

	if (size)
		info->par = p + fb_info_size;

	info->device = dev;

#ifdef CONFIG_FB_BACKLIGHT
	mutex_init(&info->bl_curve_mutex);
#endif

	return info;
#undef PADDING
#undef BYTES_PER_LONG
}
EXPORT_SYMBOL(framebuffer_alloc);

/**
 * framebuffer_release - marks the structure available for freeing
 *
 * @info: frame buffer info structure
 *
 * Drop the reference count of the device embedded in the
 * framebuffer info structure.
 *
 */
void framebuffer_release(struct fb_info *info)
{
	kfree(info);
}
EXPORT_SYMBOL(framebuffer_release);

static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
{
	int err;

	var->activate |= FB_ACTIVATE_FORCE;
	acquire_console_sem();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_set_var(fb_info, var);
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	release_console_sem();
	if (err)
		return err;
	return 0;
}

static int mode_string(char *buf, unsigned int offset,
		       const struct fb_videomode *mode)
{
	char m = 'U';
	char v = 'p';

	if (mode->flag & FB_MODE_IS_DETAILED)
		m = 'D';
	if (mode->flag & FB_MODE_IS_VESA)
		m = 'V';
	if (mode->flag & FB_MODE_IS_STANDARD)
		m = 'S';

	if (mode->vmode & FB_VMODE_INTERLACED)
		v = 'i';
	if (mode->vmode & FB_VMODE_DOUBLE)
		v = 'd';

	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	                m, mode->xres, mode->yres, v, mode->refresh);
}

static ssize_t store_mode(struct device *device, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	char mstr[100];
	struct fb_var_screeninfo var;
	struct fb_modelist *modelist;
	struct fb_videomode *mode;
	struct list_head *pos;
	size_t i;
	int err;

	memset(&var, 0, sizeof(var));

	list_for_each(pos, &fb_info->modelist) {
		modelist = list_entry(pos, struct fb_modelist, list);
		mode = &modelist->mode;
		i = mode_string(mstr, 0, mode);
		if (strncmp(mstr, buf, max(count, i)) == 0) {

			var = fb_info->var;
			fb_videomode_to_var(&var, mode);
			if ((err = activate(fb_info, &var)))
				return err;
			fb_info->mode = mode;
			return count;
		}
	}
	return -EINVAL;
}

static ssize_t show_mode(struct device *device, struct device_attribute *attr,
			 char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);

	if (!fb_info->mode)
		return 0;

	return mode_string(buf, 0, fb_info->mode);
}

static ssize_t store_modes(struct device *device,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	LIST_HEAD(old_list);
	int i = count / sizeof(struct fb_videomode);

	if (i * sizeof(struct fb_videomode) != count)
		return -EINVAL;

	acquire_console_sem();
	list_splice(&fb_info->modelist, &old_list);
	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
				 &fb_info->modelist);
	if (fb_new_modelist(fb_info)) {
		fb_destroy_modelist(&fb_info->modelist);
		list_splice(&old_list, &fb_info->modelist);
	} else
		fb_destroy_modelist(&old_list);

	release_console_sem();

	return 0;
}

static ssize_t show_modes(struct device *device, struct device_attribute *attr,
			  char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	unsigned int i;
	struct list_head *pos;
	struct fb_modelist *modelist;
	const struct fb_videomode *mode;

	i = 0;
	list_for_each(pos, &fb_info->modelist) {
		modelist = list_entry(pos, struct fb_modelist, list);
		mode = &modelist->mode;
		i += mode_string(buf, i, mode);
	}
	return i;
}

static ssize_t store_bpp(struct device *device, struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char ** last = NULL;
	int err;

	var = fb_info->var;
	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	if ((err = activate(fb_info, &var)))
		return err;
	return count;
}

static ssize_t show_bpp(struct device *device, struct device_attribute *attr,
			char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
}

static ssize_t store_rotate(struct device *device,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char **last = NULL;
	int err;

	var = fb_info->var;
	var.rotate = simple_strtoul(buf, last, 0);

	if ((err = activate(fb_info, &var)))
		return err;

	return count;
}


static ssize_t show_rotate(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);

	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
}

static ssize_t store_virtual(struct device *device,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char *last = NULL;
	int err;

	var = fb_info->var;
	var.xres_virtual = simple_strtoul(buf, &last, 0);
	last++;
	if (last - buf >= count)
		return -EINVAL;
	var.yres_virtual = simple_strtoul(last, &last, 0);

	if ((err = activate(fb_info, &var)))
		return err;
	return count;
}

static ssize_t show_virtual(struct device *device,
			    struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
			fb_info->var.yres_virtual);
}

static ssize_t show_stride(struct device *device,
			   struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
}

static ssize_t store_blank(struct device *device,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	char *last = NULL;
	int err;

	acquire_console_sem();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	release_console_sem();
	if (err < 0)
		return err;
	return count;
}

static ssize_t show_blank(struct device *device,
			  struct device_attribute *attr, char *buf)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t store_console(struct device *device,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t show_console(struct device *device,
			    struct device_attribute *attr, char *buf)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t store_cursor(struct device *device,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t show_cursor(struct device *device,
			   struct device_attribute *attr, char *buf)
{
//	struct fb_info *fb_info = dev_get_drvdata(device);
	return 0;
}

static ssize_t store_pan(struct device *device,
			 struct device_attribute *attr,
			 const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	struct fb_var_screeninfo var;
	char *last = NULL;
	int err;

	var = fb_info->var;
	var.xoffset = simple_strtoul(buf, &last, 0);
	last++;
	if (last - buf >= count)
		return -EINVAL;
	var.yoffset = simple_strtoul(last, &last, 0);

	acquire_console_sem();
	err = fb_pan_display(fb_info, &var);
	release_console_sem();

	if (err < 0)
		return err;
	return count;
}

static ssize_t show_pan(struct device *device,
			struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
			fb_info->var.yoffset);
}

static ssize_t show_name(struct device *device,
			 struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);

	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
}

static ssize_t store_fbstate(struct device *device,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	u32 state;
	char *last = NULL;

	state = simple_strtoul(buf, &last, 0);

	acquire_console_sem();
	fb_set_suspend(fb_info, (int)state);
	release_console_sem();

	return count;
}

static ssize_t show_fbstate(struct device *device,
			    struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
}

#ifdef CONFIG_FB_BACKLIGHT
static ssize_t store_bl_curve(struct device *device,
			      struct device_attribute *attr,
			      const char *buf, size_t count)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	unsigned int i;

	/* Some drivers don't use framebuffer_alloc(), but those also
	 * don't have backlights.
	 */
	if (!fb_info || !fb_info->bl_dev)
		return -ENODEV;

	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
		return -EINVAL;

	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
		if (sscanf(&buf[i * 24],
			"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
			&tmp_curve[i * 8 + 0],
			&tmp_curve[i * 8 + 1],
			&tmp_curve[i * 8 + 2],
			&tmp_curve[i * 8 + 3],
			&tmp_curve[i * 8 + 4],
			&tmp_curve[i * 8 + 5],
			&tmp_curve[i * 8 + 6],
			&tmp_curve[i * 8 + 7]) != 8)
			return -EINVAL;

	/* If there has been an error in the input data, we won't
	 * reach this loop.
	 */
	mutex_lock(&fb_info->bl_curve_mutex);
	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
		fb_info->bl_curve[i] = tmp_curve[i];
	mutex_unlock(&fb_info->bl_curve_mutex);

	return count;
}

static ssize_t show_bl_curve(struct device *device,
			     struct device_attribute *attr, char *buf)
{
	struct fb_info *fb_info = dev_get_drvdata(device);
	ssize_t len = 0;
	unsigned int i;

	/* Some drivers don't use framebuffer_alloc(), but those also
	 * don't have backlights.
	 */
	if (!fb_info || !fb_info->bl_dev)
		return -ENODEV;

	mutex_lock(&fb_info->bl_curve_mutex);
	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
		len += snprintf(&buf[len], PAGE_SIZE,
				"%02x %02x %02x %02x %02x %02x %02x %02x\n",
				fb_info->bl_curve[i + 0],
				fb_info->bl_curve[i + 1],
				fb_info->bl_curve[i + 2],
				fb_info->bl_curve[i + 3],
				fb_info->bl_curve[i + 4],
				fb_info->bl_curve[i + 5],
				fb_info->bl_curve[i + 6],
				fb_info->bl_curve[i + 7]);
	mutex_unlock(&fb_info->bl_curve_mutex);

	return len;
}
#endif

/* When cmap is added back in it should be a binary attribute
 * not a text one. Consideration should also be given to converting
 * fbdev to use configfs instead of sysfs */
static struct device_attribute device_attrs[] = {
	__ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
	__ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
	__ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console),
	__ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor),
	__ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode),
	__ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes),
	__ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
	__ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
	__ATTR(name, S_IRUGO, show_name, NULL),
	__ATTR(stride, S_IRUGO, show_stride, NULL),
	__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
	__ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
#ifdef CONFIG_FB_BACKLIGHT
	__ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),
#endif
};

int fb_init_device(struct fb_info *fb_info)
{
	int i, error = 0;

	dev_set_drvdata(fb_info->dev, fb_info);

	fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;

	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
		error = device_create_file(fb_info->dev, &device_attrs[i]);

		if (error)
			break;
	}

	if (error) {
		while (--i >= 0)
			device_remove_file(fb_info->dev, &device_attrs[i]);
		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}

	return 0;
}

void fb_cleanup_device(struct fb_info *fb_info)
{
	unsigned int i;

	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
		for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
			device_remove_file(fb_info->dev, &device_attrs[i]);

		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}
}

#ifdef CONFIG_FB_BACKLIGHT
/* This function generates a linear backlight curve
 *
 *     0: off
 *   1-7: min
 * 8-127: linear from min to max
 */
void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
{
	unsigned int i, flat, count, range = (max - min);

	mutex_lock(&fb_info->bl_curve_mutex);

	fb_info->bl_curve[0] = off;

	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
		fb_info->bl_curve[flat] = min;

	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	for (i = 0; i < count; ++i)
		fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);

	mutex_unlock(&fb_info->bl_curve_mutex);
}
EXPORT_SYMBOL_GPL(fb_bl_default_curve);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fbsysfs.c - framebuffer device class and attributes
	3	*
	4	* Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
	5	*
	6	* This program is free software you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	/*
	13	* Note: currently there's only stubs for framebuffer_alloc and
	14	* framebuffer_release here. The reson for that is that until all drivers
	15	* are converted to use it a sysfsification will open OOPSable races.
	16	*/
	17
	18	#include <linux/kernel.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20	#include <linux/fb.h>
1da177e4 LT	21	#include <linux/console.h>
5474c120	22	#include <linux/module.h>
1da177e4	23
1a6600be AD	24	#define FB_SYSFS_FLAG_ATTR 1
1a6600be AD	25
1da177e4 LT	26	/**
	27	* framebuffer_alloc - creates a new frame buffer info structure
	28	*
	29	* @size: size of driver private data, can be zero
	30	* @dev: pointer to the device for this fb, this can be NULL
	31	*
	32	* Creates a new frame buffer info structure. Also reserves @size bytes
	33	* for driver private data (info->par). info->par (if any) will be
	34	* aligned to sizeof(long).
	35	*
	36	* Returns the new structure, or NULL if an error occured.
	37	*
	38	*/
	39	struct fb_info framebuffer_alloc(size_t size, struct device dev)
	40	{
	41	#define BYTES_PER_LONG (BITS_PER_LONG/8)
	42	#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
	43	int fb_info_size = sizeof(struct fb_info);
	44	struct fb_info *info;
	45	char *p;
	46
	47	if (size)
	48	fb_info_size += PADDING;
	49
def1eded AD	50	p = kzalloc(fb_info_size + size, GFP_KERNEL);
def1eded AD	51
1da177e4 LT	52	if (!p)
1da177e4 LT	53	return NULL;
def1eded	54
1da177e4 LT	55	info = (struct fb_info *) p;
	56
	57	if (size)
	58	info->par = p + fb_info_size;
	59
	60	info->device = dev;
	61
5474c120	62	#ifdef CONFIG_FB_BACKLIGHT
37ce69a5	63	mutex_init(&info->bl_curve_mutex);
5474c120 MH	64	#endif
5474c120 MH	65
1da177e4 LT	66	return info;
	67	#undef PADDING
	68	#undef BYTES_PER_LONG
	69	}
	70	EXPORT_SYMBOL(framebuffer_alloc);
	71
	72	/**
	73	* framebuffer_release - marks the structure available for freeing
	74	*
	75	* @info: frame buffer info structure
	76	*
78cde088	77	* Drop the reference count of the device embedded in the
1da177e4 LT	78	* framebuffer info structure.
	79	*
	80	*/
	81	void framebuffer_release(struct fb_info *info)
	82	{
	83	kfree(info);
	84	}
	85	EXPORT_SYMBOL(framebuffer_release);
	86
	87	static int activate(struct fb_info fb_info, struct fb_var_screeninfo var)
	88	{
	89	int err;
	90
	91	var->activate \|= FB_ACTIVATE_FORCE;
	92	acquire_console_sem();
	93	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	94	err = fb_set_var(fb_info, var);
	95	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	96	release_console_sem();
	97	if (err)
	98	return err;
	99	return 0;
	100	}
	101
	102	static int mode_string(char *buf, unsigned int offset,
	103	const struct fb_videomode *mode)
	104	{
	105	char m = 'U';
9dac73a4 DT	106	char v = 'p';
9dac73a4 DT	107
1da177e4 LT	108	if (mode->flag & FB_MODE_IS_DETAILED)
	109	m = 'D';
	110	if (mode->flag & FB_MODE_IS_VESA)
	111	m = 'V';
	112	if (mode->flag & FB_MODE_IS_STANDARD)
	113	m = 'S';
9dac73a4 DT	114
	115	if (mode->vmode & FB_VMODE_INTERLACED)
	116	v = 'i';
	117	if (mode->vmode & FB_VMODE_DOUBLE)
	118	v = 'd';
	119
	120	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	121	m, mode->xres, mode->yres, v, mode->refresh);
1da177e4 LT	122	}
1da177e4 LT	123
78cde088 GKH	124	static ssize_t store_mode(struct device device, struct device_attribute attr,
78cde088 GKH	125	const char *buf, size_t count)
1da177e4	126	{
78cde088	127	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	128	char mstr[100];
	129	struct fb_var_screeninfo var;
	130	struct fb_modelist *modelist;
	131	struct fb_videomode *mode;
	132	struct list_head *pos;
	133	size_t i;
	134	int err;
	135
	136	memset(&var, 0, sizeof(var));
	137
	138	list_for_each(pos, &fb_info->modelist) {
	139	modelist = list_entry(pos, struct fb_modelist, list);
	140	mode = &modelist->mode;
	141	i = mode_string(mstr, 0, mode);
	142	if (strncmp(mstr, buf, max(count, i)) == 0) {
	143
	144	var = fb_info->var;
	145	fb_videomode_to_var(&var, mode);
	146	if ((err = activate(fb_info, &var)))
	147	return err;
	148	fb_info->mode = mode;
	149	return count;
	150	}
	151	}
	152	return -EINVAL;
	153	}
	154
78cde088 GKH	155	static ssize_t show_mode(struct device device, struct device_attribute attr,
78cde088 GKH	156	char *buf)
1da177e4	157	{
78cde088	158	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	159
	160	if (!fb_info->mode)
	161	return 0;
	162
	163	return mode_string(buf, 0, fb_info->mode);
	164	}
	165
78cde088 GKH	166	static ssize_t store_modes(struct device *device,
	167	struct device_attribute *attr,
	168	const char *buf, size_t count)
1da177e4	169	{
78cde088	170	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	171	LIST_HEAD(old_list);
	172	int i = count / sizeof(struct fb_videomode);
	173
	174	if (i * sizeof(struct fb_videomode) != count)
	175	return -EINVAL;
	176
	177	acquire_console_sem();
	178	list_splice(&fb_info->modelist, &old_list);
9791d763	179	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
1da177e4 LT	180	&fb_info->modelist);
	181	if (fb_new_modelist(fb_info)) {
	182	fb_destroy_modelist(&fb_info->modelist);
	183	list_splice(&old_list, &fb_info->modelist);
	184	} else
	185	fb_destroy_modelist(&old_list);
	186
	187	release_console_sem();
	188
	189	return 0;
	190	}
	191
78cde088 GKH	192	static ssize_t show_modes(struct device device, struct device_attribute attr,
78cde088 GKH	193	char *buf)
1da177e4	194	{
78cde088	195	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	196	unsigned int i;
	197	struct list_head *pos;
	198	struct fb_modelist *modelist;
	199	const struct fb_videomode *mode;
	200
	201	i = 0;
	202	list_for_each(pos, &fb_info->modelist) {
	203	modelist = list_entry(pos, struct fb_modelist, list);
	204	mode = &modelist->mode;
	205	i += mode_string(buf, i, mode);
	206	}
	207	return i;
	208	}
	209
78cde088 GKH	210	static ssize_t store_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	211	const char *buf, size_t count)
1da177e4	212	{
78cde088	213	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	214	struct fb_var_screeninfo var;
	215	char ** last = NULL;
	216	int err;
	217
	218	var = fb_info->var;
	219	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	220	if ((err = activate(fb_info, &var)))
	221	return err;
	222	return count;
	223	}
	224
78cde088 GKH	225	static ssize_t show_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	226	char *buf)
1da177e4	227	{
78cde088	228	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	229	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	230	}
	231
78cde088 GKH	232	static ssize_t store_rotate(struct device *device,
	233	struct device_attribute *attr,
	234	const char *buf, size_t count)
a812c94b	235	{
78cde088	236	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	237	struct fb_var_screeninfo var;
	238	char **last = NULL;
	239	int err;
	240
	241	var = fb_info->var;
	242	var.rotate = simple_strtoul(buf, last, 0);
	243
	244	if ((err = activate(fb_info, &var)))
	245	return err;
	246
	247	return count;
	248	}
	249
	250
78cde088 GKH	251	static ssize_t show_rotate(struct device *device,
78cde088 GKH	252	struct device_attribute attr, char buf)
a812c94b	253	{
78cde088	254	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	255
	256	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	257	}
	258
78cde088 GKH	259	static ssize_t store_virtual(struct device *device,
	260	struct device_attribute *attr,
	261	const char *buf, size_t count)
1da177e4	262	{
78cde088	263	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	264	struct fb_var_screeninfo var;
	265	char *last = NULL;
	266	int err;
	267
	268	var = fb_info->var;
	269	var.xres_virtual = simple_strtoul(buf, &last, 0);
	270	last++;
	271	if (last - buf >= count)
	272	return -EINVAL;
	273	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	274
	275	if ((err = activate(fb_info, &var)))
	276	return err;
	277	return count;
	278	}
	279
78cde088 GKH	280	static ssize_t show_virtual(struct device *device,
78cde088 GKH	281	struct device_attribute attr, char buf)
1da177e4	282	{
78cde088	283	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	284	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	285	fb_info->var.yres_virtual);
1da177e4 LT	286	}
1da177e4 LT	287
78cde088 GKH	288	static ssize_t show_stride(struct device *device,
78cde088 GKH	289	struct device_attribute attr, char buf)
c14e2cfc	290	{
78cde088	291	struct fb_info *fb_info = dev_get_drvdata(device);
c14e2cfc JS	292	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	293	}
	294
78cde088 GKH	295	static ssize_t store_blank(struct device *device,
	296	struct device_attribute *attr,
	297	const char *buf, size_t count)
1da177e4	298	{
78cde088	299	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	300	char *last = NULL;
	301	int err;
	302
	303	acquire_console_sem();
	304	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	305	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	306	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	307	release_console_sem();
	308	if (err < 0)
	309	return err;
	310	return count;
	311	}
	312
78cde088 GKH	313	static ssize_t show_blank(struct device *device,
78cde088 GKH	314	struct device_attribute attr, char buf)
1da177e4	315	{
78cde088	316	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	317	return 0;
	318	}
	319
78cde088 GKH	320	static ssize_t store_console(struct device *device,
	321	struct device_attribute *attr,
	322	const char *buf, size_t count)
1da177e4	323	{
78cde088	324	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	325	return 0;
	326	}
	327
78cde088 GKH	328	static ssize_t show_console(struct device *device,
78cde088 GKH	329	struct device_attribute attr, char buf)
1da177e4	330	{
78cde088	331	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	332	return 0;
	333	}
	334
78cde088 GKH	335	static ssize_t store_cursor(struct device *device,
	336	struct device_attribute *attr,
	337	const char *buf, size_t count)
1da177e4	338	{
78cde088	339	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	340	return 0;
	341	}
	342
78cde088 GKH	343	static ssize_t show_cursor(struct device *device,
78cde088 GKH	344	struct device_attribute attr, char buf)
1da177e4	345	{
78cde088	346	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	347	return 0;
	348	}
	349
78cde088 GKH	350	static ssize_t store_pan(struct device *device,
	351	struct device_attribute *attr,
	352	const char *buf, size_t count)
1da177e4	353	{
78cde088	354	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	355	struct fb_var_screeninfo var;
	356	char *last = NULL;
	357	int err;
	358
	359	var = fb_info->var;
	360	var.xoffset = simple_strtoul(buf, &last, 0);
	361	last++;
	362	if (last - buf >= count)
	363	return -EINVAL;
	364	var.yoffset = simple_strtoul(last, &last, 0);
	365
	366	acquire_console_sem();
	367	err = fb_pan_display(fb_info, &var);
	368	release_console_sem();
	369
	370	if (err < 0)
	371	return err;
	372	return count;
	373	}
	374
78cde088 GKH	375	static ssize_t show_pan(struct device *device,
78cde088 GKH	376	struct device_attribute attr, char buf)
1da177e4	377	{
78cde088	378	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	379	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
c4270637	380	fb_info->var.yoffset);
1da177e4 LT	381	}
1da177e4 LT	382
78cde088 GKH	383	static ssize_t show_name(struct device *device,
78cde088 GKH	384	struct device_attribute attr, char buf)
02459eaa	385	{
78cde088	386	struct fb_info *fb_info = dev_get_drvdata(device);
02459eaa JS	387
	388	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	389	}
	390
78cde088 GKH	391	static ssize_t store_fbstate(struct device *device,
	392	struct device_attribute *attr,
	393	const char *buf, size_t count)
30420f8f	394	{
78cde088	395	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	396	u32 state;
	397	char *last = NULL;
	398
	399	state = simple_strtoul(buf, &last, 0);
	400
	401	acquire_console_sem();
	402	fb_set_suspend(fb_info, (int)state);
	403	release_console_sem();
	404
	405	return count;
	406	}
	407
78cde088 GKH	408	static ssize_t show_fbstate(struct device *device,
78cde088 GKH	409	struct device_attribute attr, char buf)
30420f8f	410	{
78cde088	411	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	412	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	413	}
	414
5474c120	415	#ifdef CONFIG_FB_BACKLIGHT
78cde088 GKH	416	static ssize_t store_bl_curve(struct device *device,
	417	struct device_attribute *attr,
	418	const char *buf, size_t count)
5474c120	419	{
78cde088	420	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	421	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	422	unsigned int i;
	423
25981de5 MH	424	/* Some drivers don't use framebuffer_alloc(), but those also
	425	* don't have backlights.
	426	*/
	427	if (!fb_info \|\| !fb_info->bl_dev)
	428	return -ENODEV;
	429
5474c120 MH	430	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	431	return -EINVAL;
	432
	433	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	434	if (sscanf(&buf[i * 24],
	435	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	436	&tmp_curve[i * 8 + 0],
	437	&tmp_curve[i * 8 + 1],
	438	&tmp_curve[i * 8 + 2],
	439	&tmp_curve[i * 8 + 3],
	440	&tmp_curve[i * 8 + 4],
	441	&tmp_curve[i * 8 + 5],
	442	&tmp_curve[i * 8 + 6],
	443	&tmp_curve[i * 8 + 7]) != 8)
	444	return -EINVAL;
	445
	446	/* If there has been an error in the input data, we won't
	447	* reach this loop.
	448	*/
37ce69a5	449	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	450	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
5474c120 MH	451	fb_info->bl_curve[i] = tmp_curve[i];
37ce69a5	452	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	453
	454	return count;
	455	}
	456
78cde088 GKH	457	static ssize_t show_bl_curve(struct device *device,
78cde088 GKH	458	struct device_attribute attr, char buf)
5474c120	459	{
78cde088	460	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	461	ssize_t len = 0;
	462	unsigned int i;
	463
25981de5 MH	464	/* Some drivers don't use framebuffer_alloc(), but those also
	465	* don't have backlights.
	466	*/
	467	if (!fb_info \|\| !fb_info->bl_dev)
	468	return -ENODEV;
	469
37ce69a5	470	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	471	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	472	len += snprintf(&buf[len], PAGE_SIZE,
	473	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	474	fb_info->bl_curve[i + 0],
	475	fb_info->bl_curve[i + 1],
	476	fb_info->bl_curve[i + 2],
	477	fb_info->bl_curve[i + 3],
	478	fb_info->bl_curve[i + 4],
	479	fb_info->bl_curve[i + 5],
	480	fb_info->bl_curve[i + 6],
	481	fb_info->bl_curve[i + 7]);
37ce69a5	482	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	483
	484	return len;
	485	}
	486	#endif
	487
913e7ec5 JS	488	/* When cmap is added back in it should be a binary attribute
	489	* not a text one. Consideration should also be given to converting
	490	* fbdev to use configfs instead of sysfs */
78cde088	491	static struct device_attribute device_attrs[] = {
1da177e4 LT	492	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	493	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	494	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	495	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	496	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	497	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	498	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	499	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	500	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	501	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b	502	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
30420f8f	503	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	504	#ifdef CONFIG_FB_BACKLIGHT
	505	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	506	#endif
1da177e4 LT	507	};
1da177e4 LT	508
78cde088	509	int fb_init_device(struct fb_info *fb_info)
1da177e4	510	{
1a6600be AD	511	int i, error = 0;
1a6600be AD	512
78cde088	513	dev_set_drvdata(fb_info->dev, fb_info);
1da177e4	514
1a6600be AD	515	fb_info->class_flag \|= FB_SYSFS_FLAG_ATTR;
1a6600be AD	516
78cde088 GKH	517	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
78cde088 GKH	518	error = device_create_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	519
	520	if (error)
	521	break;
	522	}
	523
	524	if (error) {
	525	while (--i >= 0)
78cde088	526	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	527	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	528	}
	529
1da177e4 LT	530	return 0;
	531	}
	532
78cde088	533	void fb_cleanup_device(struct fb_info *fb_info)
1da177e4 LT	534	{
	535	unsigned int i;
	536
1a6600be	537	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
78cde088 GKH	538	for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
78cde088 GKH	539	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	540
	541	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	542	}
1da177e4 LT	543	}
1da177e4 LT	544
5474c120 MH	545	#ifdef CONFIG_FB_BACKLIGHT
	546	/* This function generates a linear backlight curve
	547	*
	548	* 0: off
	549	* 1-7: min
	550	* 8-127: linear from min to max
	551	*/
	552	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	553	{
	554	unsigned int i, flat, count, range = (max - min);
	555
37ce69a5 RP	556	mutex_lock(&fb_info->bl_curve_mutex);
37ce69a5 RP	557
5474c120	558	fb_info->bl_curve[0] = off;
1da177e4	559
5474c120 MH	560	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	561	fb_info->bl_curve[flat] = min;
	562
	563	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	564	for (i = 0; i < count; ++i)
	565	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
37ce69a5 RP	566
37ce69a5 RP	567	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	568	}
	569	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	570	#endif