[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>

#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_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_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;

	/* 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_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;

	/* 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_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(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)
{
	int i, error = 0;

	class_set_devdata(fb_info->class_device, fb_info);

	fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;

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

		if (error)
			break;
	}

	if (error) {
		while (--i >= 0)
			class_device_remove_file(fb_info->class_device,
						 &class_device_attrs[i]);
		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}

	return 0;
}

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

	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
		for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
			class_device_remove_file(fb_info->class_device,
						 &class_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);

	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	22
1a6600be AD	23	#define FB_SYSFS_FLAG_ATTR 1
1a6600be AD	24
1da177e4 LT	25	/**
	26	* framebuffer_alloc - creates a new frame buffer info structure
	27	*
	28	* @size: size of driver private data, can be zero
	29	* @dev: pointer to the device for this fb, this can be NULL
	30	*
	31	* Creates a new frame buffer info structure. Also reserves @size bytes
	32	* for driver private data (info->par). info->par (if any) will be
	33	* aligned to sizeof(long).
	34	*
	35	* Returns the new structure, or NULL if an error occured.
	36	*
	37	*/
	38	struct fb_info framebuffer_alloc(size_t size, struct device dev)
	39	{
	40	#define BYTES_PER_LONG (BITS_PER_LONG/8)
	41	#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
	42	int fb_info_size = sizeof(struct fb_info);
	43	struct fb_info *info;
	44	char *p;
	45
	46	if (size)
	47	fb_info_size += PADDING;
	48
def1eded AD	49	p = kzalloc(fb_info_size + size, GFP_KERNEL);
def1eded AD	50
1da177e4 LT	51	if (!p)
1da177e4 LT	52	return NULL;
def1eded	53
1da177e4 LT	54	info = (struct fb_info *) p;
	55
	56	if (size)
	57	info->par = p + fb_info_size;
	58
	59	info->device = dev;
	60
5474c120 MH	61	#ifdef CONFIG_FB_BACKLIGHT
	62	mutex_init(&info->bl_mutex);
	63	#endif
	64
1da177e4 LT	65	return info;
	66	#undef PADDING
	67	#undef BYTES_PER_LONG
	68	}
	69	EXPORT_SYMBOL(framebuffer_alloc);
	70
	71	/**
	72	* framebuffer_release - marks the structure available for freeing
	73	*
	74	* @info: frame buffer info structure
	75	*
	76	* Drop the reference count of the class_device embedded in the
	77	* framebuffer info structure.
	78	*
	79	*/
	80	void framebuffer_release(struct fb_info *info)
	81	{
	82	kfree(info);
	83	}
	84	EXPORT_SYMBOL(framebuffer_release);
	85
	86	static int activate(struct fb_info fb_info, struct fb_var_screeninfo var)
	87	{
	88	int err;
	89
	90	var->activate \|= FB_ACTIVATE_FORCE;
	91	acquire_console_sem();
	92	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	93	err = fb_set_var(fb_info, var);
	94	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	95	release_console_sem();
	96	if (err)
	97	return err;
	98	return 0;
	99	}
	100
	101	static int mode_string(char *buf, unsigned int offset,
	102	const struct fb_videomode *mode)
	103	{
	104	char m = 'U';
9dac73a4 DT	105	char v = 'p';
9dac73a4 DT	106
1da177e4 LT	107	if (mode->flag & FB_MODE_IS_DETAILED)
	108	m = 'D';
	109	if (mode->flag & FB_MODE_IS_VESA)
	110	m = 'V';
	111	if (mode->flag & FB_MODE_IS_STANDARD)
	112	m = 'S';
9dac73a4 DT	113
	114	if (mode->vmode & FB_VMODE_INTERLACED)
	115	v = 'i';
	116	if (mode->vmode & FB_VMODE_DOUBLE)
	117	v = 'd';
	118
	119	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	120	m, mode->xres, mode->yres, v, mode->refresh);
1da177e4 LT	121	}
	122
	123	static ssize_t store_mode(struct class_device class_device, const char buf,
	124	size_t count)
	125	{
313e58ab	126	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	127	char mstr[100];
	128	struct fb_var_screeninfo var;
	129	struct fb_modelist *modelist;
	130	struct fb_videomode *mode;
	131	struct list_head *pos;
	132	size_t i;
	133	int err;
	134
	135	memset(&var, 0, sizeof(var));
	136
	137	list_for_each(pos, &fb_info->modelist) {
	138	modelist = list_entry(pos, struct fb_modelist, list);
	139	mode = &modelist->mode;
	140	i = mode_string(mstr, 0, mode);
	141	if (strncmp(mstr, buf, max(count, i)) == 0) {
	142
	143	var = fb_info->var;
	144	fb_videomode_to_var(&var, mode);
	145	if ((err = activate(fb_info, &var)))
	146	return err;
	147	fb_info->mode = mode;
	148	return count;
	149	}
	150	}
	151	return -EINVAL;
	152	}
	153
	154	static ssize_t show_mode(struct class_device class_device, char buf)
	155	{
313e58ab	156	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	157
	158	if (!fb_info->mode)
	159	return 0;
	160
	161	return mode_string(buf, 0, fb_info->mode);
	162	}
	163
	164	static ssize_t store_modes(struct class_device class_device, const char buf,
	165	size_t count)
	166	{
313e58ab	167	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	168	LIST_HEAD(old_list);
	169	int i = count / sizeof(struct fb_videomode);
	170
	171	if (i * sizeof(struct fb_videomode) != count)
	172	return -EINVAL;
	173
	174	acquire_console_sem();
	175	list_splice(&fb_info->modelist, &old_list);
	176	fb_videomode_to_modelist((struct fb_videomode *)buf, i,
	177	&fb_info->modelist);
	178	if (fb_new_modelist(fb_info)) {
	179	fb_destroy_modelist(&fb_info->modelist);
	180	list_splice(&old_list, &fb_info->modelist);
	181	} else
	182	fb_destroy_modelist(&old_list);
	183
	184	release_console_sem();
	185
	186	return 0;
	187	}
	188
	189	static ssize_t show_modes(struct class_device class_device, char buf)
	190	{
313e58ab	191	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	192	unsigned int i;
	193	struct list_head *pos;
	194	struct fb_modelist *modelist;
	195	const struct fb_videomode *mode;
	196
	197	i = 0;
	198	list_for_each(pos, &fb_info->modelist) {
	199	modelist = list_entry(pos, struct fb_modelist, list);
	200	mode = &modelist->mode;
	201	i += mode_string(buf, i, mode);
	202	}
	203	return i;
	204	}
	205
	206	static ssize_t store_bpp(struct class_device class_device, const char buf,
	207	size_t count)
	208	{
313e58ab	209	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	210	struct fb_var_screeninfo var;
	211	char ** last = NULL;
	212	int err;
	213
	214	var = fb_info->var;
	215	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	216	if ((err = activate(fb_info, &var)))
	217	return err;
	218	return count;
	219	}
	220
	221	static ssize_t show_bpp(struct class_device class_device, char buf)
	222	{
313e58ab	223	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	224	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	225	}
	226
a812c94b AD	227	static ssize_t store_rotate(struct class_device class_device, const char buf,
	228	size_t count)
	229	{
	230	struct fb_info *fb_info = class_get_devdata(class_device);
	231	struct fb_var_screeninfo var;
	232	char **last = NULL;
	233	int err;
	234
	235	var = fb_info->var;
	236	var.rotate = simple_strtoul(buf, last, 0);
	237
	238	if ((err = activate(fb_info, &var)))
	239	return err;
	240
	241	return count;
	242	}
	243
	244
	245	static ssize_t show_rotate(struct class_device class_device, char buf)
	246	{
	247	struct fb_info *fb_info = class_get_devdata(class_device);
	248
	249	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	250	}
	251
1da177e4 LT	252	static ssize_t store_virtual(struct class_device *class_device,
	253	const char * buf, size_t count)
	254	{
313e58ab	255	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	256	struct fb_var_screeninfo var;
	257	char *last = NULL;
	258	int err;
	259
	260	var = fb_info->var;
	261	var.xres_virtual = simple_strtoul(buf, &last, 0);
	262	last++;
	263	if (last - buf >= count)
	264	return -EINVAL;
	265	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	266
	267	if ((err = activate(fb_info, &var)))
	268	return err;
	269	return count;
	270	}
	271
	272	static ssize_t show_virtual(struct class_device class_device, char buf)
	273	{
313e58ab	274	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4	275	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	276	fb_info->var.yres_virtual);
1da177e4 LT	277	}
1da177e4 LT	278
c14e2cfc JS	279	static ssize_t show_stride(struct class_device class_device, char buf)
c14e2cfc JS	280	{
313e58ab	281	struct fb_info *fb_info = class_get_devdata(class_device);
c14e2cfc JS	282	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	283	}
	284
1da177e4 LT	285	static ssize_t store_blank(struct class_device class_device, const char buf,
	286	size_t count)
	287	{
313e58ab	288	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	289	char *last = NULL;
	290	int err;
	291
	292	acquire_console_sem();
	293	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	294	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	295	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	296	release_console_sem();
	297	if (err < 0)
	298	return err;
	299	return count;
	300	}
	301
	302	static ssize_t show_blank(struct class_device class_device, char buf)
	303	{
313e58ab	304	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	305	return 0;
	306	}
	307
	308	static ssize_t store_console(struct class_device *class_device,
	309	const char * buf, size_t count)
	310	{
313e58ab	311	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	312	return 0;
	313	}
	314
	315	static ssize_t show_console(struct class_device class_device, char buf)
	316	{
313e58ab	317	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	318	return 0;
	319	}
	320
	321	static ssize_t store_cursor(struct class_device *class_device,
	322	const char * buf, size_t count)
	323	{
313e58ab	324	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	325	return 0;
	326	}
	327
	328	static ssize_t show_cursor(struct class_device class_device, char buf)
	329	{
313e58ab	330	// struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	331	return 0;
	332	}
	333
	334	static ssize_t store_pan(struct class_device class_device, const char buf,
	335	size_t count)
	336	{
313e58ab	337	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	338	struct fb_var_screeninfo var;
	339	char *last = NULL;
	340	int err;
	341
	342	var = fb_info->var;
	343	var.xoffset = simple_strtoul(buf, &last, 0);
	344	last++;
	345	if (last - buf >= count)
	346	return -EINVAL;
	347	var.yoffset = simple_strtoul(last, &last, 0);
	348
	349	acquire_console_sem();
	350	err = fb_pan_display(fb_info, &var);
	351	release_console_sem();
	352
	353	if (err < 0)
	354	return err;
	355	return count;
	356	}
	357
	358	static ssize_t show_pan(struct class_device class_device, char buf)
	359	{
313e58ab	360	struct fb_info *fb_info = class_get_devdata(class_device);
1da177e4 LT	361	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
	362	fb_info->var.xoffset);
	363	}
	364
02459eaa JS	365	static ssize_t show_name(struct class_device class_device, char buf)
02459eaa JS	366	{
313e58ab	367	struct fb_info *fb_info = class_get_devdata(class_device);
02459eaa JS	368
	369	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	370	}
	371
30420f8f MG	372	static ssize_t store_fbstate(struct class_device *class_device,
	373	const char *buf, size_t count)
	374	{
	375	struct fb_info *fb_info = class_get_devdata(class_device);
	376	u32 state;
	377	char *last = NULL;
	378
	379	state = simple_strtoul(buf, &last, 0);
	380
	381	acquire_console_sem();
	382	fb_set_suspend(fb_info, (int)state);
	383	release_console_sem();
	384
	385	return count;
	386	}
	387
	388	static ssize_t show_fbstate(struct class_device class_device, char buf)
	389	{
	390	struct fb_info *fb_info = class_get_devdata(class_device);
	391	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	392	}
	393
5474c120 MH	394	#ifdef CONFIG_FB_BACKLIGHT
	395	static ssize_t store_bl_curve(struct class_device *class_device,
	396	const char *buf, size_t count)
	397	{
	398	struct fb_info *fb_info = class_get_devdata(class_device);
	399	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	400	unsigned int i;
	401
25981de5 MH	402	/* Some drivers don't use framebuffer_alloc(), but those also
	403	* don't have backlights.
	404	*/
	405	if (!fb_info \|\| !fb_info->bl_dev)
	406	return -ENODEV;
	407
5474c120 MH	408	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	409	return -EINVAL;
	410
	411	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	412	if (sscanf(&buf[i * 24],
	413	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	414	&tmp_curve[i * 8 + 0],
	415	&tmp_curve[i * 8 + 1],
	416	&tmp_curve[i * 8 + 2],
	417	&tmp_curve[i * 8 + 3],
	418	&tmp_curve[i * 8 + 4],
	419	&tmp_curve[i * 8 + 5],
	420	&tmp_curve[i * 8 + 6],
	421	&tmp_curve[i * 8 + 7]) != 8)
	422	return -EINVAL;
	423
	424	/* If there has been an error in the input data, we won't
	425	* reach this loop.
	426	*/
	427	mutex_lock(&fb_info->bl_mutex);
	428	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
	429	fb_info->bl_curve[i] = tmp_curve[i];
	430	mutex_unlock(&fb_info->bl_mutex);
	431
	432	return count;
	433	}
	434
	435	static ssize_t show_bl_curve(struct class_device class_device, char buf)
	436	{
	437	struct fb_info *fb_info = class_get_devdata(class_device);
	438	ssize_t len = 0;
	439	unsigned int i;
	440
25981de5 MH	441	/* Some drivers don't use framebuffer_alloc(), but those also
	442	* don't have backlights.
	443	*/
	444	if (!fb_info \|\| !fb_info->bl_dev)
	445	return -ENODEV;
	446
5474c120 MH	447	mutex_lock(&fb_info->bl_mutex);
	448	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	449	len += snprintf(&buf[len], PAGE_SIZE,
	450	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	451	fb_info->bl_curve[i + 0],
	452	fb_info->bl_curve[i + 1],
	453	fb_info->bl_curve[i + 2],
	454	fb_info->bl_curve[i + 3],
	455	fb_info->bl_curve[i + 4],
	456	fb_info->bl_curve[i + 5],
	457	fb_info->bl_curve[i + 6],
	458	fb_info->bl_curve[i + 7]);
	459	mutex_unlock(&fb_info->bl_mutex);
	460
	461	return len;
	462	}
	463	#endif
	464
913e7ec5 JS	465	/* When cmap is added back in it should be a binary attribute
	466	* not a text one. Consideration should also be given to converting
	467	* fbdev to use configfs instead of sysfs */
75c96f85	468	static struct class_device_attribute class_device_attrs[] = {
1da177e4 LT	469	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	470	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	471	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	472	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	473	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	474	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	475	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	476	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	477	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	478	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b	479	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
30420f8f	480	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	481	#ifdef CONFIG_FB_BACKLIGHT
	482	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	483	#endif
1da177e4 LT	484	};
	485
	486	int fb_init_class_device(struct fb_info *fb_info)
	487	{
1a6600be AD	488	int i, error = 0;
1a6600be AD	489
1da177e4 LT	490	class_set_devdata(fb_info->class_device, fb_info);
1da177e4 LT	491
1a6600be AD	492	fb_info->class_flag \|= FB_SYSFS_FLAG_ATTR;
	493
	494	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++) {
	495	error = class_device_create_file(fb_info->class_device,
	496	&class_device_attrs[i]);
	497
	498	if (error)
	499	break;
	500	}
	501
	502	if (error) {
	503	while (--i >= 0)
	504	class_device_remove_file(fb_info->class_device,
	505	&class_device_attrs[i]);
	506	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	507	}
	508
1da177e4 LT	509	return 0;
	510	}
	511
	512	void fb_cleanup_class_device(struct fb_info *fb_info)
	513	{
	514	unsigned int i;
	515
1a6600be AD	516	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
	517	for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
	518	class_device_remove_file(fb_info->class_device,
	519	&class_device_attrs[i]);
	520
	521	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	522	}
1da177e4 LT	523	}
1da177e4 LT	524
5474c120 MH	525	#ifdef CONFIG_FB_BACKLIGHT
	526	/* This function generates a linear backlight curve
	527	*
	528	* 0: off
	529	* 1-7: min
	530	* 8-127: linear from min to max
	531	*/
	532	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	533	{
	534	unsigned int i, flat, count, range = (max - min);
	535
	536	fb_info->bl_curve[0] = off;
1da177e4	537
5474c120 MH	538	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	539	fb_info->bl_curve[flat] = min;
	540
	541	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	542	for (i = 0; i < count; ++i)
	543	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
	544	}
	545	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	546	#endif