[deliverable/linux.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';
	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';
	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d-%d\n", m, mode->xres, mode->yres, 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';
	103	if (mode->flag & FB_MODE_IS_DETAILED)
	104	m = 'D';
	105	if (mode->flag & FB_MODE_IS_VESA)
	106	m = 'V';
	107	if (mode->flag & FB_MODE_IS_STANDARD)
	108	m = 'S';
	109	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d-%d\n", m, mode->xres, mode->yres, mode->refresh);
	110	}
	111
	112	static ssize_t store_mode(struct class_device class_device, const char buf,
	113	size_t count)
	114	{
313e58ab	115	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	116	char mstr[100];
	117	struct fb_var_screeninfo var;
	118	struct fb_modelist *modelist;
	119	struct fb_videomode *mode;
	120	struct list_head *pos;
	121	size_t i;
	122	int err;
	123
	124	memset(&var, 0, sizeof(var));
	125
	126	list_for_each(pos, &fb_info->modelist) {
	127	modelist = list_entry(pos, struct fb_modelist, list);
	128	mode = &modelist->mode;
	129	i = mode_string(mstr, 0, mode);
	130	if (strncmp(mstr, buf, max(count, i)) == 0) {
	131
	132	var = fb_info->var;
	133	fb_videomode_to_var(&var, mode);
	134	if ((err = activate(fb_info, &var)))
	135	return err;
	136	fb_info->mode = mode;
	137	return count;
	138	}
	139	}
	140	return -EINVAL;
	141	}
	142
	143	static ssize_t show_mode(struct class_device class_device, char buf)
	144	{
313e58ab	145	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	146
	147	if (!fb_info->mode)
	148	return 0;
	149
	150	return mode_string(buf, 0, fb_info->mode);
	151	}
	152
	153	static ssize_t store_modes(struct class_device class_device, const char buf,
	154	size_t count)
	155	{
313e58ab	156	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	157	LIST_HEAD(old_list);
	158	int i = count / sizeof(struct fb_videomode);
	159
	160	if (i * sizeof(struct fb_videomode) != count)
	161	return -EINVAL;
	162
	163	acquire_console_sem();
	164	list_splice(&fb_info->modelist, &old_list);
	165	fb_videomode_to_modelist((struct fb_videomode *)buf, i,
	166	&fb_info->modelist);
	167	if (fb_new_modelist(fb_info)) {
	168	fb_destroy_modelist(&fb_info->modelist);
	169	list_splice(&old_list, &fb_info->modelist);
	170	} else
	171	fb_destroy_modelist(&old_list);
	172
	173	release_console_sem();
	174
	175	return 0;
	176	}
	177
	178	static ssize_t show_modes(struct class_device class_device, char buf)
	179	{
313e58ab	180	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	181	unsigned int i;
	182	struct list_head *pos;
	183	struct fb_modelist *modelist;
	184	const struct fb_videomode *mode;
	185
	186	i = 0;
	187	list_for_each(pos, &fb_info->modelist) {
	188	modelist = list_entry(pos, struct fb_modelist, list);
	189	mode = &modelist->mode;
	190	i += mode_string(buf, i, mode);
	191	}
	192	return i;
	193	}
	194
	195	static ssize_t store_bpp(struct class_device class_device, const char buf,
	196	size_t count)
	197	{
313e58ab	198	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	199	struct fb_var_screeninfo var;
	200	char ** last = NULL;
	201	int err;
	202
	203	var = fb_info->var;
	204	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	205	if ((err = activate(fb_info, &var)))
	206	return err;
	207	return count;
	208	}
	209
	210	static ssize_t show_bpp(struct class_device class_device, char buf)
	211	{
313e58ab	212	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	213	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	214	}
	215
a812c94b AD	216	static ssize_t store_rotate(struct class_device class_device, const char buf,
	217	size_t count)
	218	{
	219	struct fb_info *fb_info = class_get_devdata(class_device);
	220	struct fb_var_screeninfo var;
	221	char **last = NULL;
	222	int err;
	223
	224	var = fb_info->var;
	225	var.rotate = simple_strtoul(buf, last, 0);
	226
	227	if ((err = activate(fb_info, &var)))
	228	return err;
	229
	230	return count;
	231	}
	232
	233
	234	static ssize_t show_rotate(struct class_device class_device, char buf)
	235	{
	236	struct fb_info *fb_info = class_get_devdata(class_device);
	237
	238	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	239	}
	240
	241	static ssize_t store_con_rotate(struct class_device *class_device,
	242	const char *buf, size_t count)
	243	{
	244	struct fb_info *fb_info = class_get_devdata(class_device);
	245	int rotate;
	246	char **last = NULL;
	247
	248	acquire_console_sem();
	249	rotate = simple_strtoul(buf, last, 0);
	250	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE, &rotate);
	251	release_console_sem();
	252	return count;
	253	}
	254
	255	static ssize_t store_con_rotate_all(struct class_device *class_device,
	256	const char *buf, size_t count)
	257	{
	258	struct fb_info *fb_info = class_get_devdata(class_device);
	259	int rotate;
	260	char **last = NULL;
	261
	262	acquire_console_sem();
	263	rotate = simple_strtoul(buf, last, 0);
	264	fb_con_duit(fb_info, FB_EVENT_SET_CON_ROTATE_ALL, &rotate);
	265	release_console_sem();
	266	return count;
	267	}
	268
	269	static ssize_t show_con_rotate(struct class_device class_device, char buf)
	270	{
	271	struct fb_info *fb_info = class_get_devdata(class_device);
	272	int rotate;
	273
	274	acquire_console_sem();
	275	rotate = fb_con_duit(fb_info, FB_EVENT_GET_CON_ROTATE, NULL);
	276	release_console_sem();
	277	return snprintf(buf, PAGE_SIZE, "%d\n", rotate);
	278	}
	279
1da177e4 LT	280	static ssize_t store_virtual(struct class_device *class_device,
	281	const char * buf, size_t count)
	282	{
313e58ab	283	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	284	struct fb_var_screeninfo var;
	285	char *last = NULL;
	286	int err;
	287
	288	var = fb_info->var;
	289	var.xres_virtual = simple_strtoul(buf, &last, 0);
	290	last++;
	291	if (last - buf >= count)
	292	return -EINVAL;
	293	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	294
	295	if ((err = activate(fb_info, &var)))
	296	return err;
	297	return count;
	298	}
	299
	300	static ssize_t show_virtual(struct class_device class_device, char buf)
	301	{
313e58ab	302	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4	303	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	304	fb_info->var.yres_virtual);
1da177e4 LT	305	}
1da177e4 LT	306
c14e2cfc JS	307	static ssize_t show_stride(struct class_device class_device, char buf)
c14e2cfc JS	308	{
313e58ab	309	struct fb_info *fb_info = class_get_devdata(class_device);
c14e2cfc JS	310	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	311	}
	312
1da177e4 LT	313	static ssize_t store_blank(struct class_device class_device, const char buf,
	314	size_t count)
	315	{
313e58ab	316	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	317	char *last = NULL;
	318	int err;
	319
	320	acquire_console_sem();
	321	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	322	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	323	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	324	release_console_sem();
	325	if (err < 0)
	326	return err;
	327	return count;
	328	}
	329
	330	static ssize_t show_blank(struct class_device class_device, char buf)
	331	{
313e58ab	332	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	333	return 0;
	334	}
	335
	336	static ssize_t store_console(struct class_device *class_device,
	337	const char * buf, size_t count)
	338	{
313e58ab	339	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	340	return 0;
	341	}
	342
	343	static ssize_t show_console(struct class_device class_device, char buf)
	344	{
313e58ab	345	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	346	return 0;
	347	}
	348
	349	static ssize_t store_cursor(struct class_device *class_device,
	350	const char * buf, size_t count)
	351	{
313e58ab	352	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	353	return 0;
	354	}
	355
	356	static ssize_t show_cursor(struct class_device class_device, char buf)
	357	{
313e58ab	358	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	359	return 0;
	360	}
	361
	362	static ssize_t store_pan(struct class_device class_device, const char buf,
	363	size_t count)
	364	{
313e58ab	365	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	366	struct fb_var_screeninfo var;
	367	char *last = NULL;
	368	int err;
	369
	370	var = fb_info->var;
	371	var.xoffset = simple_strtoul(buf, &last, 0);
	372	last++;
	373	if (last - buf >= count)
	374	return -EINVAL;
	375	var.yoffset = simple_strtoul(last, &last, 0);
	376
	377	acquire_console_sem();
	378	err = fb_pan_display(fb_info, &var);
	379	release_console_sem();
	380
	381	if (err < 0)
	382	return err;
	383	return count;
	384	}
	385
	386	static ssize_t show_pan(struct class_device class_device, char buf)
	387	{
313e58ab	388	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	389	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
	390	fb_info->var.xoffset);
	391	}
	392
02459eaa JS	393	static ssize_t show_name(struct class_device class_device, char buf)
02459eaa JS	394	{
313e58ab	395	struct fb_info *fb_info = class_get_devdata(class_device);
02459eaa JS	396
	397	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	398	}
	399
30420f8f MG	400	static ssize_t store_fbstate(struct class_device *class_device,
	401	const char *buf, size_t count)
	402	{
	403	struct fb_info *fb_info = class_get_devdata(class_device);
	404	u32 state;
	405	char *last = NULL;
	406
	407	state = simple_strtoul(buf, &last, 0);
	408
	409	acquire_console_sem();
	410	fb_set_suspend(fb_info, (int)state);
	411	release_console_sem();
	412
	413	return count;
	414	}
	415
	416	static ssize_t show_fbstate(struct class_device class_device, char buf)
	417	{
	418	struct fb_info *fb_info = class_get_devdata(class_device);
	419	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	420	}
	421
5474c120 MH	422	#ifdef CONFIG_FB_BACKLIGHT
	423	static ssize_t store_bl_curve(struct class_device *class_device,
	424	const char *buf, size_t count)
	425	{
	426	struct fb_info *fb_info = class_get_devdata(class_device);
	427	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	428	unsigned int i;
	429
	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	*/
	449	mutex_lock(&fb_info->bl_mutex);
	450	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
	451	fb_info->bl_curve[i] = tmp_curve[i];
	452	mutex_unlock(&fb_info->bl_mutex);
	453
	454	return count;
	455	}
	456
	457	static ssize_t show_bl_curve(struct class_device class_device, char buf)
	458	{
	459	struct fb_info *fb_info = class_get_devdata(class_device);
	460	ssize_t len = 0;
	461	unsigned int i;
	462
	463	mutex_lock(&fb_info->bl_mutex);
	464	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	465	len += snprintf(&buf[len], PAGE_SIZE,
	466	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	467	fb_info->bl_curve[i + 0],
	468	fb_info->bl_curve[i + 1],
	469	fb_info->bl_curve[i + 2],
	470	fb_info->bl_curve[i + 3],
	471	fb_info->bl_curve[i + 4],
	472	fb_info->bl_curve[i + 5],
	473	fb_info->bl_curve[i + 6],
	474	fb_info->bl_curve[i + 7]);
	475	mutex_unlock(&fb_info->bl_mutex);
	476
	477	return len;
	478	}
	479	#endif
	480
913e7ec5 JS	481	/* When cmap is added back in it should be a binary attribute
	482	* not a text one. Consideration should also be given to converting
	483	* fbdev to use configfs instead of sysfs */
75c96f85	484	static struct class_device_attribute class_device_attrs[] = {
1da177e4 LT	485	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	486	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	487	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	488	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	489	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	490	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	491	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	492	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	493	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	494	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b AD	495	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
	496	__ATTR(con_rotate, S_IRUGO\|S_IWUSR, show_con_rotate, store_con_rotate),
	497	__ATTR(con_rotate_all, S_IWUSR, NULL, store_con_rotate_all),
30420f8f	498	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	499	#ifdef CONFIG_FB_BACKLIGHT
	500	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	501	#endif
1da177e4 LT	502	};
	503
	504	int fb_init_class_device(struct fb_info *fb_info)
	505	{
	506	unsigned int i;
	507	class_set_devdata(fb_info->class_device, fb_info);
	508
	509	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
	510	class_device_create_file(fb_info->class_device,
	511	&class_device_attrs[i]);
	512	return 0;
	513	}
	514
	515	void fb_cleanup_class_device(struct fb_info *fb_info)
	516	{
	517	unsigned int i;
	518
	519	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
	520	class_device_remove_file(fb_info->class_device,
	521	&class_device_attrs[i]);
	522	}
	523
5474c120 MH	524	#ifdef CONFIG_FB_BACKLIGHT
	525	/* This function generates a linear backlight curve
	526	*
	527	* 0: off
	528	* 1-7: min
	529	* 8-127: linear from min to max
	530	*/
	531	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	532	{
	533	unsigned int i, flat, count, range = (max - min);
	534
	535	fb_info->bl_curve[0] = off;
1da177e4	536
5474c120 MH	537	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	538	fb_info->bl_curve[flat] = min;
	539
	540	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	541	for (i = 0; i < count; ++i)
	542	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
	543	}
	544	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	545	#endif