[net-next-2.6.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->apertures);
	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	{
1471ca9a	83	kfree(info->apertures);
1da177e4 LT	84	kfree(info);
	85	}
	86	EXPORT_SYMBOL(framebuffer_release);
	87
	88	static int activate(struct fb_info fb_info, struct fb_var_screeninfo var)
	89	{
	90	int err;
	91
	92	var->activate \|= FB_ACTIVATE_FORCE;
	93	acquire_console_sem();
	94	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	95	err = fb_set_var(fb_info, var);
	96	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	97	release_console_sem();
	98	if (err)
	99	return err;
	100	return 0;
	101	}
	102
	103	static int mode_string(char *buf, unsigned int offset,
	104	const struct fb_videomode *mode)
	105	{
	106	char m = 'U';
9dac73a4 DT	107	char v = 'p';
9dac73a4 DT	108
1da177e4 LT	109	if (mode->flag & FB_MODE_IS_DETAILED)
	110	m = 'D';
	111	if (mode->flag & FB_MODE_IS_VESA)
	112	m = 'V';
	113	if (mode->flag & FB_MODE_IS_STANDARD)
	114	m = 'S';
9dac73a4 DT	115
	116	if (mode->vmode & FB_VMODE_INTERLACED)
	117	v = 'i';
	118	if (mode->vmode & FB_VMODE_DOUBLE)
	119	v = 'd';
	120
	121	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	122	m, mode->xres, mode->yres, v, mode->refresh);
1da177e4 LT	123	}
1da177e4 LT	124
78cde088 GKH	125	static ssize_t store_mode(struct device device, struct device_attribute attr,
78cde088 GKH	126	const char *buf, size_t count)
1da177e4	127	{
78cde088	128	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	129	char mstr[100];
	130	struct fb_var_screeninfo var;
	131	struct fb_modelist *modelist;
	132	struct fb_videomode *mode;
	133	struct list_head *pos;
	134	size_t i;
	135	int err;
	136
	137	memset(&var, 0, sizeof(var));
	138
	139	list_for_each(pos, &fb_info->modelist) {
	140	modelist = list_entry(pos, struct fb_modelist, list);
	141	mode = &modelist->mode;
	142	i = mode_string(mstr, 0, mode);
	143	if (strncmp(mstr, buf, max(count, i)) == 0) {
	144
	145	var = fb_info->var;
	146	fb_videomode_to_var(&var, mode);
	147	if ((err = activate(fb_info, &var)))
	148	return err;
	149	fb_info->mode = mode;
	150	return count;
	151	}
	152	}
	153	return -EINVAL;
	154	}
	155
78cde088 GKH	156	static ssize_t show_mode(struct device device, struct device_attribute attr,
78cde088 GKH	157	char *buf)
1da177e4	158	{
78cde088	159	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	160
	161	if (!fb_info->mode)
	162	return 0;
	163
	164	return mode_string(buf, 0, fb_info->mode);
	165	}
	166
78cde088 GKH	167	static ssize_t store_modes(struct device *device,
	168	struct device_attribute *attr,
	169	const char *buf, size_t count)
1da177e4	170	{
78cde088	171	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	172	LIST_HEAD(old_list);
	173	int i = count / sizeof(struct fb_videomode);
	174
	175	if (i * sizeof(struct fb_videomode) != count)
	176	return -EINVAL;
	177
	178	acquire_console_sem();
	179	list_splice(&fb_info->modelist, &old_list);
9791d763	180	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
1da177e4 LT	181	&fb_info->modelist);
	182	if (fb_new_modelist(fb_info)) {
	183	fb_destroy_modelist(&fb_info->modelist);
	184	list_splice(&old_list, &fb_info->modelist);
	185	} else
	186	fb_destroy_modelist(&old_list);
	187
	188	release_console_sem();
	189
	190	return 0;
	191	}
	192
78cde088 GKH	193	static ssize_t show_modes(struct device device, struct device_attribute attr,
78cde088 GKH	194	char *buf)
1da177e4	195	{
78cde088	196	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	197	unsigned int i;
	198	struct list_head *pos;
	199	struct fb_modelist *modelist;
	200	const struct fb_videomode *mode;
	201
	202	i = 0;
	203	list_for_each(pos, &fb_info->modelist) {
	204	modelist = list_entry(pos, struct fb_modelist, list);
	205	mode = &modelist->mode;
	206	i += mode_string(buf, i, mode);
	207	}
	208	return i;
	209	}
	210
78cde088 GKH	211	static ssize_t store_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	212	const char *buf, size_t count)
1da177e4	213	{
78cde088	214	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	215	struct fb_var_screeninfo var;
	216	char ** last = NULL;
	217	int err;
	218
	219	var = fb_info->var;
	220	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	221	if ((err = activate(fb_info, &var)))
	222	return err;
	223	return count;
	224	}
	225
78cde088 GKH	226	static ssize_t show_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	227	char *buf)
1da177e4	228	{
78cde088	229	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	230	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	231	}
	232
78cde088 GKH	233	static ssize_t store_rotate(struct device *device,
	234	struct device_attribute *attr,
	235	const char *buf, size_t count)
a812c94b	236	{
78cde088	237	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	238	struct fb_var_screeninfo var;
	239	char **last = NULL;
	240	int err;
	241
	242	var = fb_info->var;
	243	var.rotate = simple_strtoul(buf, last, 0);
	244
	245	if ((err = activate(fb_info, &var)))
	246	return err;
	247
	248	return count;
	249	}
	250
	251
78cde088 GKH	252	static ssize_t show_rotate(struct device *device,
78cde088 GKH	253	struct device_attribute attr, char buf)
a812c94b	254	{
78cde088	255	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	256
	257	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	258	}
	259
78cde088 GKH	260	static ssize_t store_virtual(struct device *device,
	261	struct device_attribute *attr,
	262	const char *buf, size_t count)
1da177e4	263	{
78cde088	264	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	265	struct fb_var_screeninfo var;
	266	char *last = NULL;
	267	int err;
	268
	269	var = fb_info->var;
	270	var.xres_virtual = simple_strtoul(buf, &last, 0);
	271	last++;
	272	if (last - buf >= count)
	273	return -EINVAL;
	274	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	275
	276	if ((err = activate(fb_info, &var)))
	277	return err;
	278	return count;
	279	}
	280
78cde088 GKH	281	static ssize_t show_virtual(struct device *device,
78cde088 GKH	282	struct device_attribute attr, char buf)
1da177e4	283	{
78cde088	284	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	285	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	286	fb_info->var.yres_virtual);
1da177e4 LT	287	}
1da177e4 LT	288
78cde088 GKH	289	static ssize_t show_stride(struct device *device,
78cde088 GKH	290	struct device_attribute attr, char buf)
c14e2cfc	291	{
78cde088	292	struct fb_info *fb_info = dev_get_drvdata(device);
c14e2cfc JS	293	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	294	}
	295
78cde088 GKH	296	static ssize_t store_blank(struct device *device,
	297	struct device_attribute *attr,
	298	const char *buf, size_t count)
1da177e4	299	{
78cde088	300	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	301	char *last = NULL;
	302	int err;
	303
	304	acquire_console_sem();
	305	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	306	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	307	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	308	release_console_sem();
	309	if (err < 0)
	310	return err;
	311	return count;
	312	}
	313
78cde088 GKH	314	static ssize_t show_blank(struct device *device,
78cde088 GKH	315	struct device_attribute attr, char buf)
1da177e4	316	{
78cde088	317	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	318	return 0;
	319	}
	320
78cde088 GKH	321	static ssize_t store_console(struct device *device,
	322	struct device_attribute *attr,
	323	const char *buf, size_t count)
1da177e4	324	{
78cde088	325	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	326	return 0;
	327	}
	328
78cde088 GKH	329	static ssize_t show_console(struct device *device,
78cde088 GKH	330	struct device_attribute attr, char buf)
1da177e4	331	{
78cde088	332	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	333	return 0;
	334	}
	335
78cde088 GKH	336	static ssize_t store_cursor(struct device *device,
	337	struct device_attribute *attr,
	338	const char *buf, size_t count)
1da177e4	339	{
78cde088	340	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	341	return 0;
	342	}
	343
78cde088 GKH	344	static ssize_t show_cursor(struct device *device,
78cde088 GKH	345	struct device_attribute attr, char buf)
1da177e4	346	{
78cde088	347	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	348	return 0;
	349	}
	350
78cde088 GKH	351	static ssize_t store_pan(struct device *device,
	352	struct device_attribute *attr,
	353	const char *buf, size_t count)
1da177e4	354	{
78cde088	355	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	356	struct fb_var_screeninfo var;
	357	char *last = NULL;
	358	int err;
	359
	360	var = fb_info->var;
	361	var.xoffset = simple_strtoul(buf, &last, 0);
	362	last++;
	363	if (last - buf >= count)
	364	return -EINVAL;
	365	var.yoffset = simple_strtoul(last, &last, 0);
	366
	367	acquire_console_sem();
	368	err = fb_pan_display(fb_info, &var);
	369	release_console_sem();
	370
	371	if (err < 0)
	372	return err;
	373	return count;
	374	}
	375
78cde088 GKH	376	static ssize_t show_pan(struct device *device,
78cde088 GKH	377	struct device_attribute attr, char buf)
1da177e4	378	{
78cde088	379	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	380	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
c4270637	381	fb_info->var.yoffset);
1da177e4 LT	382	}
1da177e4 LT	383
78cde088 GKH	384	static ssize_t show_name(struct device *device,
78cde088 GKH	385	struct device_attribute attr, char buf)
02459eaa	386	{
78cde088	387	struct fb_info *fb_info = dev_get_drvdata(device);
02459eaa JS	388
	389	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	390	}
	391
78cde088 GKH	392	static ssize_t store_fbstate(struct device *device,
	393	struct device_attribute *attr,
	394	const char *buf, size_t count)
30420f8f	395	{
78cde088	396	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	397	u32 state;
	398	char *last = NULL;
	399
	400	state = simple_strtoul(buf, &last, 0);
	401
	402	acquire_console_sem();
	403	fb_set_suspend(fb_info, (int)state);
	404	release_console_sem();
	405
	406	return count;
	407	}
	408
78cde088 GKH	409	static ssize_t show_fbstate(struct device *device,
78cde088 GKH	410	struct device_attribute attr, char buf)
30420f8f	411	{
78cde088	412	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	413	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	414	}
	415
5474c120	416	#ifdef CONFIG_FB_BACKLIGHT
78cde088 GKH	417	static ssize_t store_bl_curve(struct device *device,
	418	struct device_attribute *attr,
	419	const char *buf, size_t count)
5474c120	420	{
78cde088	421	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	422	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	423	unsigned int i;
	424
25981de5 MH	425	/* Some drivers don't use framebuffer_alloc(), but those also
	426	* don't have backlights.
	427	*/
	428	if (!fb_info \|\| !fb_info->bl_dev)
	429	return -ENODEV;
	430
5474c120 MH	431	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	432	return -EINVAL;
	433
	434	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	435	if (sscanf(&buf[i * 24],
	436	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	437	&tmp_curve[i * 8 + 0],
	438	&tmp_curve[i * 8 + 1],
	439	&tmp_curve[i * 8 + 2],
	440	&tmp_curve[i * 8 + 3],
	441	&tmp_curve[i * 8 + 4],
	442	&tmp_curve[i * 8 + 5],
	443	&tmp_curve[i * 8 + 6],
	444	&tmp_curve[i * 8 + 7]) != 8)
	445	return -EINVAL;
	446
	447	/* If there has been an error in the input data, we won't
	448	* reach this loop.
	449	*/
37ce69a5	450	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	451	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
5474c120 MH	452	fb_info->bl_curve[i] = tmp_curve[i];
37ce69a5	453	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	454
	455	return count;
	456	}
	457
78cde088 GKH	458	static ssize_t show_bl_curve(struct device *device,
78cde088 GKH	459	struct device_attribute attr, char buf)
5474c120	460	{
78cde088	461	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	462	ssize_t len = 0;
	463	unsigned int i;
	464
25981de5 MH	465	/* Some drivers don't use framebuffer_alloc(), but those also
	466	* don't have backlights.
	467	*/
	468	if (!fb_info \|\| !fb_info->bl_dev)
	469	return -ENODEV;
	470
37ce69a5	471	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	472	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	473	len += snprintf(&buf[len], PAGE_SIZE,
	474	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	475	fb_info->bl_curve[i + 0],
	476	fb_info->bl_curve[i + 1],
	477	fb_info->bl_curve[i + 2],
	478	fb_info->bl_curve[i + 3],
	479	fb_info->bl_curve[i + 4],
	480	fb_info->bl_curve[i + 5],
	481	fb_info->bl_curve[i + 6],
	482	fb_info->bl_curve[i + 7]);
37ce69a5	483	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	484
	485	return len;
	486	}
	487	#endif
	488
913e7ec5 JS	489	/* When cmap is added back in it should be a binary attribute
	490	* not a text one. Consideration should also be given to converting
	491	* fbdev to use configfs instead of sysfs */
78cde088	492	static struct device_attribute device_attrs[] = {
1da177e4 LT	493	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	494	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	495	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	496	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	497	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	498	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	499	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	500	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	501	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	502	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b	503	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
30420f8f	504	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	505	#ifdef CONFIG_FB_BACKLIGHT
	506	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	507	#endif
1da177e4 LT	508	};
1da177e4 LT	509
78cde088	510	int fb_init_device(struct fb_info *fb_info)
1da177e4	511	{
1a6600be AD	512	int i, error = 0;
1a6600be AD	513
78cde088	514	dev_set_drvdata(fb_info->dev, fb_info);
1da177e4	515
1a6600be AD	516	fb_info->class_flag \|= FB_SYSFS_FLAG_ATTR;
1a6600be AD	517
78cde088 GKH	518	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
78cde088 GKH	519	error = device_create_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	520
	521	if (error)
	522	break;
	523	}
	524
	525	if (error) {
	526	while (--i >= 0)
78cde088	527	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	528	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	529	}
	530
1da177e4 LT	531	return 0;
	532	}
	533
78cde088	534	void fb_cleanup_device(struct fb_info *fb_info)
1da177e4 LT	535	{
	536	unsigned int i;
	537
1a6600be	538	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
78cde088 GKH	539	for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
78cde088 GKH	540	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	541
	542	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	543	}
1da177e4 LT	544	}
1da177e4 LT	545
5474c120 MH	546	#ifdef CONFIG_FB_BACKLIGHT
	547	/* This function generates a linear backlight curve
	548	*
	549	* 0: off
	550	* 1-7: min
	551	* 8-127: linear from min to max
	552	*/
	553	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	554	{
	555	unsigned int i, flat, count, range = (max - min);
	556
37ce69a5 RP	557	mutex_lock(&fb_info->bl_curve_mutex);
37ce69a5 RP	558
5474c120	559	fb_info->bl_curve[0] = off;
1da177e4	560
5474c120 MH	561	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	562	fb_info->bl_curve[flat] = min;
	563
	564	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	565	for (i = 0; i < count; ++i)
	566	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
37ce69a5 RP	567
37ce69a5 RP	568	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	569	}
	570	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	571	#endif