[linux-block.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/fb.h>
#include <linux/console.h>
#include <linux/module.h>

/**
 * 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_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 class_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 class_device *class_device, const char * buf,
			  size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);

	if (!fb_info->mode)
		return 0;

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

static ssize_t store_modes(struct class_device *class_device, const char * buf,
			   size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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((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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, const char * buf,
			 size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
}

static ssize_t store_rotate(struct class_device *class_device, const char *buf,
			    size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);

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

static ssize_t store_con_rotate(struct class_device *class_device,
				const char *buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	int rotate;
	char **last = NULL;

	acquire_console_sem();
	rotate = simple_strtoul(buf, last, 0);
	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE, &rotate);
	release_console_sem();
	return count;
}

static ssize_t store_con_rotate_all(struct class_device *class_device,
				const char *buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	int rotate;
	char **last = NULL;

	acquire_console_sem();
	rotate = simple_strtoul(buf, last, 0);
	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE_ALL, &rotate);
	release_console_sem();
	return count;
}

static ssize_t show_con_rotate(struct class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	int rotate;

	acquire_console_sem();
	rotate = fb_con_duit(fb_info, FB_EVENT_GET_CON_ROTATE, NULL);
	release_console_sem();
	return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
}

static ssize_t store_virtual(struct class_device *class_device,
			     const char * buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
}

static ssize_t store_blank(struct class_device *class_device, const char * buf,
			   size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
//	struct fb_info *fb_info = class_get_devdata(class_device);
	return 0;
}

static ssize_t store_console(struct class_device *class_device,
			     const char * buf, size_t count)
{
//	struct fb_info *fb_info = class_get_devdata(class_device);
	return 0;
}

static ssize_t show_console(struct class_device *class_device, char *buf)
{
//	struct fb_info *fb_info = class_get_devdata(class_device);
	return 0;
}

static ssize_t store_cursor(struct class_device *class_device,
			    const char * buf, size_t count)
{
//	struct fb_info *fb_info = class_get_devdata(class_device);
	return 0;
}

static ssize_t show_cursor(struct class_device *class_device, char *buf)
{
//	struct fb_info *fb_info = class_get_devdata(class_device);
	return 0;
}

static ssize_t store_pan(struct class_device *class_device, const char * buf,
			 size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
			fb_info->var.xoffset);
}

static ssize_t show_name(struct class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);

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

static ssize_t store_fbstate(struct class_device *class_device,
			const char *buf, size_t count)
{
	struct fb_info *fb_info = class_get_devdata(class_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 class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
}

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

	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_mutex);
	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
		fb_info->bl_curve[i] = tmp_curve[i];
	mutex_unlock(&fb_info->bl_mutex);

	return count;
}

static ssize_t show_bl_curve(struct class_device *class_device, char *buf)
{
	struct fb_info *fb_info = class_get_devdata(class_device);
	ssize_t len = 0;
	unsigned int i;

	mutex_lock(&fb_info->bl_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_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 class_device_attribute class_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(con_rotate, S_IRUGO|S_IWUSR, show_con_rotate, store_con_rotate),
	__ATTR(con_rotate_all, S_IWUSR, NULL, store_con_rotate_all),
	__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_class_device(struct fb_info *fb_info)
{
	unsigned int i;
	class_set_devdata(fb_info->class_device, fb_info);

	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
		class_device_create_file(fb_info->class_device,
					 &class_device_attrs[i]);
	return 0;
}

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

	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
		class_device_remove_file(fb_info->class_device,
					 &class_device_attrs[i]);
}

#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);

	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);
}
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>
	19	#include <linux/fb.h>
	20	#include <linux/console.h>
5474c120	21	#include <linux/module.h>
1da177e4 LT	22
	23	/**
	24	* framebuffer_alloc - creates a new frame buffer info structure
	25	*
	26	* @size: size of driver private data, can be zero
	27	* @dev: pointer to the device for this fb, this can be NULL
	28	*
	29	* Creates a new frame buffer info structure. Also reserves @size bytes
	30	* for driver private data (info->par). info->par (if any) will be
	31	* aligned to sizeof(long).
	32	*
	33	* Returns the new structure, or NULL if an error occured.
	34	*
	35	*/
	36	struct fb_info framebuffer_alloc(size_t size, struct device dev)
	37	{
	38	#define BYTES_PER_LONG (BITS_PER_LONG/8)
	39	#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
	40	int fb_info_size = sizeof(struct fb_info);
	41	struct fb_info *info;
	42	char *p;
	43
	44	if (size)
	45	fb_info_size += PADDING;
	46
def1eded AD	47	p = kzalloc(fb_info_size + size, GFP_KERNEL);
def1eded AD	48
1da177e4 LT	49	if (!p)
1da177e4 LT	50	return NULL;
def1eded	51
1da177e4 LT	52	info = (struct fb_info *) p;
	53
	54	if (size)
	55	info->par = p + fb_info_size;
	56
	57	info->device = dev;
	58
5474c120 MH	59	#ifdef CONFIG_FB_BACKLIGHT
	60	mutex_init(&info->bl_mutex);
	61	#endif
	62
1da177e4 LT	63	return info;
	64	#undef PADDING
	65	#undef BYTES_PER_LONG
	66	}
	67	EXPORT_SYMBOL(framebuffer_alloc);
	68
	69	/**
	70	* framebuffer_release - marks the structure available for freeing
	71	*
	72	* @info: frame buffer info structure
	73	*
	74	* Drop the reference count of the class_device embedded in the
	75	* framebuffer info structure.
	76	*
	77	*/
	78	void framebuffer_release(struct fb_info *info)
	79	{
	80	kfree(info);
	81	}
	82	EXPORT_SYMBOL(framebuffer_release);
	83
	84	static int activate(struct fb_info fb_info, struct fb_var_screeninfo var)
	85	{
	86	int err;
	87
	88	var->activate \|= FB_ACTIVATE_FORCE;
	89	acquire_console_sem();
	90	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	91	err = fb_set_var(fb_info, var);
	92	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	93	release_console_sem();
	94	if (err)
	95	return err;
	96	return 0;
	97	}
	98
	99	static int mode_string(char *buf, unsigned int offset,
	100	const struct fb_videomode *mode)
	101	{
	102	char m = 'U';
9dac73a4 DT	103	char v = 'p';
9dac73a4 DT	104
1da177e4 LT	105	if (mode->flag & FB_MODE_IS_DETAILED)
	106	m = 'D';
	107	if (mode->flag & FB_MODE_IS_VESA)
	108	m = 'V';
	109	if (mode->flag & FB_MODE_IS_STANDARD)
	110	m = 'S';
9dac73a4 DT	111
	112	if (mode->vmode & FB_VMODE_INTERLACED)
	113	v = 'i';
	114	if (mode->vmode & FB_VMODE_DOUBLE)
	115	v = 'd';
	116
	117	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	118	m, mode->xres, mode->yres, v, mode->refresh);
1da177e4 LT	119	}
	120
	121	static ssize_t store_mode(struct class_device class_device, const char buf,
	122	size_t count)
	123	{
313e58ab	124	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	125	char mstr[100];
	126	struct fb_var_screeninfo var;
	127	struct fb_modelist *modelist;
	128	struct fb_videomode *mode;
	129	struct list_head *pos;
	130	size_t i;
	131	int err;
	132
	133	memset(&var, 0, sizeof(var));
	134
	135	list_for_each(pos, &fb_info->modelist) {
	136	modelist = list_entry(pos, struct fb_modelist, list);
	137	mode = &modelist->mode;
	138	i = mode_string(mstr, 0, mode);
	139	if (strncmp(mstr, buf, max(count, i)) == 0) {
	140
	141	var = fb_info->var;
	142	fb_videomode_to_var(&var, mode);
	143	if ((err = activate(fb_info, &var)))
	144	return err;
	145	fb_info->mode = mode;
	146	return count;
	147	}
	148	}
	149	return -EINVAL;
	150	}
	151
	152	static ssize_t show_mode(struct class_device class_device, char buf)
	153	{
313e58ab	154	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	155
	156	if (!fb_info->mode)
	157	return 0;
	158
	159	return mode_string(buf, 0, fb_info->mode);
	160	}
	161
	162	static ssize_t store_modes(struct class_device class_device, const char buf,
	163	size_t count)
	164	{
313e58ab	165	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	166	LIST_HEAD(old_list);
	167	int i = count / sizeof(struct fb_videomode);
	168
	169	if (i * sizeof(struct fb_videomode) != count)
	170	return -EINVAL;
	171
	172	acquire_console_sem();
	173	list_splice(&fb_info->modelist, &old_list);
	174	fb_videomode_to_modelist((struct fb_videomode *)buf, i,
	175	&fb_info->modelist);
	176	if (fb_new_modelist(fb_info)) {
	177	fb_destroy_modelist(&fb_info->modelist);
	178	list_splice(&old_list, &fb_info->modelist);
	179	} else
	180	fb_destroy_modelist(&old_list);
	181
	182	release_console_sem();
	183
	184	return 0;
	185	}
	186
	187	static ssize_t show_modes(struct class_device class_device, char buf)
	188	{
313e58ab	189	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	190	unsigned int i;
	191	struct list_head *pos;
	192	struct fb_modelist *modelist;
	193	const struct fb_videomode *mode;
	194
	195	i = 0;
	196	list_for_each(pos, &fb_info->modelist) {
	197	modelist = list_entry(pos, struct fb_modelist, list);
	198	mode = &modelist->mode;
	199	i += mode_string(buf, i, mode);
	200	}
	201	return i;
	202	}
	203
	204	static ssize_t store_bpp(struct class_device class_device, const char buf,
	205	size_t count)
	206	{
313e58ab	207	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	208	struct fb_var_screeninfo var;
	209	char ** last = NULL;
	210	int err;
	211
	212	var = fb_info->var;
	213	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	214	if ((err = activate(fb_info, &var)))
	215	return err;
	216	return count;
	217	}
	218
	219	static ssize_t show_bpp(struct class_device class_device, char buf)
	220	{
313e58ab	221	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	222	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	223	}
	224
a812c94b AD	225	static ssize_t store_rotate(struct class_device class_device, const char buf,
	226	size_t count)
	227	{
	228	struct fb_info *fb_info = class_get_devdata(class_device);
	229	struct fb_var_screeninfo var;
	230	char **last = NULL;
	231	int err;
	232
	233	var = fb_info->var;
	234	var.rotate = simple_strtoul(buf, last, 0);
	235
	236	if ((err = activate(fb_info, &var)))
	237	return err;
	238
	239	return count;
	240	}
	241
	242
	243	static ssize_t show_rotate(struct class_device class_device, char buf)
	244	{
	245	struct fb_info *fb_info = class_get_devdata(class_device);
	246
	247	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	248	}
	249
	250	static ssize_t store_con_rotate(struct class_device *class_device,
	251	const char *buf, size_t count)
	252	{
	253	struct fb_info *fb_info = class_get_devdata(class_device);
	254	int rotate;
	255	char **last = NULL;
	256
	257	acquire_console_sem();
	258	rotate = simple_strtoul(buf, last, 0);
	259	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE, &rotate);
	260	release_console_sem();
	261	return count;
	262	}
	263
	264	static ssize_t store_con_rotate_all(struct class_device *class_device,
	265	const char *buf, size_t count)
	266	{
	267	struct fb_info *fb_info = class_get_devdata(class_device);
	268	int rotate;
	269	char **last = NULL;
	270
	271	acquire_console_sem();
	272	rotate = simple_strtoul(buf, last, 0);
	273	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE_ALL, &rotate);
	274	release_console_sem();
	275	return count;
	276	}
	277
	278	static ssize_t show_con_rotate(struct class_device class_device, char buf)
	279	{
	280	struct fb_info *fb_info = class_get_devdata(class_device);
	281	int rotate;
	282
	283	acquire_console_sem();
	284	rotate = fb_con_duit(fb_info, FB_EVENT_GET_CON_ROTATE, NULL);
	285	release_console_sem();
	286	return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
	287	}
	288
1da177e4 LT	289	static ssize_t store_virtual(struct class_device *class_device,
	290	const char * buf, size_t count)
	291	{
313e58ab	292	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	293	struct fb_var_screeninfo var;
	294	char *last = NULL;
	295	int err;
	296
	297	var = fb_info->var;
	298	var.xres_virtual = simple_strtoul(buf, &last, 0);
	299	last++;
	300	if (last - buf >= count)
	301	return -EINVAL;
	302	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	303
	304	if ((err = activate(fb_info, &var)))
	305	return err;
	306	return count;
	307	}
	308
	309	static ssize_t show_virtual(struct class_device class_device, char buf)
	310	{
313e58ab	311	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4	312	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	313	fb_info->var.yres_virtual);
1da177e4 LT	314	}
1da177e4 LT	315
c14e2cfc JS	316	static ssize_t show_stride(struct class_device class_device, char buf)
c14e2cfc JS	317	{
313e58ab	318	struct fb_info *fb_info = class_get_devdata(class_device);
c14e2cfc JS	319	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	320	}
	321
1da177e4 LT	322	static ssize_t store_blank(struct class_device class_device, const char buf,
	323	size_t count)
	324	{
313e58ab	325	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	326	char *last = NULL;
	327	int err;
	328
	329	acquire_console_sem();
	330	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	331	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	332	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	333	release_console_sem();
	334	if (err < 0)
	335	return err;
	336	return count;
	337	}
	338
	339	static ssize_t show_blank(struct class_device class_device, char buf)
	340	{
313e58ab	341	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	342	return 0;
	343	}
	344
	345	static ssize_t store_console(struct class_device *class_device,
	346	const char * buf, size_t count)
	347	{
313e58ab	348	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	349	return 0;
	350	}
	351
	352	static ssize_t show_console(struct class_device class_device, char buf)
	353	{
313e58ab	354	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	355	return 0;
	356	}
	357
	358	static ssize_t store_cursor(struct class_device *class_device,
	359	const char * buf, size_t count)
	360	{
313e58ab	361	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	362	return 0;
	363	}
	364
	365	static ssize_t show_cursor(struct class_device class_device, char buf)
	366	{
313e58ab	367	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	368	return 0;
	369	}
	370
	371	static ssize_t store_pan(struct class_device class_device, const char buf,
	372	size_t count)
	373	{
313e58ab	374	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	375	struct fb_var_screeninfo var;
	376	char *last = NULL;
	377	int err;
	378
	379	var = fb_info->var;
	380	var.xoffset = simple_strtoul(buf, &last, 0);
	381	last++;
	382	if (last - buf >= count)
	383	return -EINVAL;
	384	var.yoffset = simple_strtoul(last, &last, 0);
	385
	386	acquire_console_sem();
	387	err = fb_pan_display(fb_info, &var);
	388	release_console_sem();
	389
	390	if (err < 0)
	391	return err;
	392	return count;
	393	}
	394
	395	static ssize_t show_pan(struct class_device class_device, char buf)
	396	{
313e58ab	397	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	398	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
	399	fb_info->var.xoffset);
	400	}
	401
02459eaa JS	402	static ssize_t show_name(struct class_device class_device, char buf)
02459eaa JS	403	{
313e58ab	404	struct fb_info *fb_info = class_get_devdata(class_device);
02459eaa JS	405
	406	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	407	}
	408
30420f8f MG	409	static ssize_t store_fbstate(struct class_device *class_device,
	410	const char *buf, size_t count)
	411	{
	412	struct fb_info *fb_info = class_get_devdata(class_device);
	413	u32 state;
	414	char *last = NULL;
	415
	416	state = simple_strtoul(buf, &last, 0);
	417
	418	acquire_console_sem();
	419	fb_set_suspend(fb_info, (int)state);
	420	release_console_sem();
	421
	422	return count;
	423	}
	424
	425	static ssize_t show_fbstate(struct class_device class_device, char buf)
	426	{
	427	struct fb_info *fb_info = class_get_devdata(class_device);
	428	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	429	}
	430
5474c120 MH	431	#ifdef CONFIG_FB_BACKLIGHT
	432	static ssize_t store_bl_curve(struct class_device *class_device,
	433	const char *buf, size_t count)
	434	{
	435	struct fb_info *fb_info = class_get_devdata(class_device);
	436	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	437	unsigned int i;
	438
	439	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	440	return -EINVAL;
	441
	442	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	443	if (sscanf(&buf[i * 24],
	444	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	445	&tmp_curve[i * 8 + 0],
	446	&tmp_curve[i * 8 + 1],
	447	&tmp_curve[i * 8 + 2],
	448	&tmp_curve[i * 8 + 3],
	449	&tmp_curve[i * 8 + 4],
	450	&tmp_curve[i * 8 + 5],
	451	&tmp_curve[i * 8 + 6],
	452	&tmp_curve[i * 8 + 7]) != 8)
	453	return -EINVAL;
	454
	455	/* If there has been an error in the input data, we won't
	456	* reach this loop.
	457	*/
	458	mutex_lock(&fb_info->bl_mutex);
	459	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
	460	fb_info->bl_curve[i] = tmp_curve[i];
	461	mutex_unlock(&fb_info->bl_mutex);
	462
	463	return count;
	464	}
	465
	466	static ssize_t show_bl_curve(struct class_device class_device, char buf)
	467	{
	468	struct fb_info *fb_info = class_get_devdata(class_device);
	469	ssize_t len = 0;
	470	unsigned int i;
	471
	472	mutex_lock(&fb_info->bl_mutex);
	473	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	474	len += snprintf(&buf[len], PAGE_SIZE,
	475	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	476	fb_info->bl_curve[i + 0],
	477	fb_info->bl_curve[i + 1],
	478	fb_info->bl_curve[i + 2],
	479	fb_info->bl_curve[i + 3],
	480	fb_info->bl_curve[i + 4],
	481	fb_info->bl_curve[i + 5],
	482	fb_info->bl_curve[i + 6],
	483	fb_info->bl_curve[i + 7]);
	484	mutex_unlock(&fb_info->bl_mutex);
	485
	486	return len;
	487	}
	488	#endif
	489
913e7ec5 JS	490	/* When cmap is added back in it should be a binary attribute
	491	* not a text one. Consideration should also be given to converting
	492	* fbdev to use configfs instead of sysfs */
75c96f85	493	static struct class_device_attribute class_device_attrs[] = {
1da177e4 LT	494	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	495	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	496	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	497	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	498	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	499	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	500	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	501	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	502	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	503	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b AD	504	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
	505	__ATTR(con_rotate, S_IRUGO\|S_IWUSR, show_con_rotate, store_con_rotate),
	506	__ATTR(con_rotate_all, S_IWUSR, NULL, store_con_rotate_all),
30420f8f	507	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	508	#ifdef CONFIG_FB_BACKLIGHT
	509	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	510	#endif
1da177e4 LT	511	};
	512
	513	int fb_init_class_device(struct fb_info *fb_info)
	514	{
	515	unsigned int i;
	516	class_set_devdata(fb_info->class_device, fb_info);
	517
	518	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
	519	class_device_create_file(fb_info->class_device,
	520	&class_device_attrs[i]);
	521	return 0;
	522	}
	523
	524	void fb_cleanup_class_device(struct fb_info *fb_info)
	525	{
	526	unsigned int i;
	527
	528	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
	529	class_device_remove_file(fb_info->class_device,
	530	&class_device_attrs[i]);
	531	}
	532
5474c120 MH	533	#ifdef CONFIG_FB_BACKLIGHT
	534	/* This function generates a linear backlight curve
	535	*
	536	* 0: off
	537	* 1-7: min
	538	* 8-127: linear from min to max
	539	*/
	540	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	541	{
	542	unsigned int i, flat, count, range = (max - min);
	543
	544	fb_info->bl_curve[0] = off;
1da177e4	545
5474c120 MH	546	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	547	fb_info->bl_curve[flat] = min;
	548
	549	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	550	for (i = 0; i < count; ++i)
	551	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
	552	}
	553	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	554	#endif