[linux.git] / drivers / video / fbsysfs.c

/*
 * fbsysfs.c - framebuffer device class and attributes
 *
 * Copyright (c) 2004 James Simmons <[email protected]>
 * 
 *	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_curve_mutex);
#endif

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

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

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

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

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

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

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

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

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

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

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

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

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

	if (!fb_info->mode)
		return 0;

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

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

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

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

	release_console_sem();

	return 0;
}

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

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

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

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

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

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

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

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

	return count;
}


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return count;
}

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

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

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

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

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

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

	return count;
}

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

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

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

	return len;
}
#endif

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

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

	dev_set_drvdata(fb_info->dev, fb_info);

	fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;

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

		if (error)
			break;
	}

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

	return 0;
}

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

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

		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}
}

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

	mutex_lock(&fb_info->bl_curve_mutex);

	fb_info->bl_curve[0] = off;

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

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

	mutex_unlock(&fb_info->bl_curve_mutex);
}
EXPORT_SYMBOL_GPL(fb_bl_default_curve);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fbsysfs.c - framebuffer device class and attributes
	3	*
	4	* Copyright (c) 2004 James Simmons <[email protected]>
	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	61	#ifdef CONFIG_FB_BACKLIGHT
37ce69a5	62	mutex_init(&info->bl_curve_mutex);
5474c120 MH	63	#endif
5474c120 MH	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	*
78cde088	76	* Drop the reference count of the device embedded in the
1da177e4 LT	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	}
1da177e4 LT	122
78cde088 GKH	123	static ssize_t store_mode(struct device device, struct device_attribute attr,
78cde088 GKH	124	const char *buf, size_t count)
1da177e4	125	{
78cde088	126	struct fb_info *fb_info = dev_get_drvdata(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
78cde088 GKH	154	static ssize_t show_mode(struct device device, struct device_attribute attr,
78cde088 GKH	155	char *buf)
1da177e4	156	{
78cde088	157	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	158
	159	if (!fb_info->mode)
	160	return 0;
	161
	162	return mode_string(buf, 0, fb_info->mode);
	163	}
	164
78cde088 GKH	165	static ssize_t store_modes(struct device *device,
	166	struct device_attribute *attr,
	167	const char *buf, size_t count)
1da177e4	168	{
78cde088	169	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	170	LIST_HEAD(old_list);
	171	int i = count / sizeof(struct fb_videomode);
	172
	173	if (i * sizeof(struct fb_videomode) != count)
	174	return -EINVAL;
	175
	176	acquire_console_sem();
	177	list_splice(&fb_info->modelist, &old_list);
9791d763	178	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
1da177e4 LT	179	&fb_info->modelist);
	180	if (fb_new_modelist(fb_info)) {
	181	fb_destroy_modelist(&fb_info->modelist);
	182	list_splice(&old_list, &fb_info->modelist);
	183	} else
	184	fb_destroy_modelist(&old_list);
	185
	186	release_console_sem();
	187
	188	return 0;
	189	}
	190
78cde088 GKH	191	static ssize_t show_modes(struct device device, struct device_attribute attr,
78cde088 GKH	192	char *buf)
1da177e4	193	{
78cde088	194	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	195	unsigned int i;
	196	struct list_head *pos;
	197	struct fb_modelist *modelist;
	198	const struct fb_videomode *mode;
	199
	200	i = 0;
	201	list_for_each(pos, &fb_info->modelist) {
	202	modelist = list_entry(pos, struct fb_modelist, list);
	203	mode = &modelist->mode;
	204	i += mode_string(buf, i, mode);
	205	}
	206	return i;
	207	}
	208
78cde088 GKH	209	static ssize_t store_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	210	const char *buf, size_t count)
1da177e4	211	{
78cde088	212	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	213	struct fb_var_screeninfo var;
	214	char ** last = NULL;
	215	int err;
	216
	217	var = fb_info->var;
	218	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	219	if ((err = activate(fb_info, &var)))
	220	return err;
	221	return count;
	222	}
	223
78cde088 GKH	224	static ssize_t show_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	225	char *buf)
1da177e4	226	{
78cde088	227	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	228	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	229	}
	230
78cde088 GKH	231	static ssize_t store_rotate(struct device *device,
	232	struct device_attribute *attr,
	233	const char *buf, size_t count)
a812c94b	234	{
78cde088	235	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	236	struct fb_var_screeninfo var;
	237	char **last = NULL;
	238	int err;
	239
	240	var = fb_info->var;
	241	var.rotate = simple_strtoul(buf, last, 0);
	242
	243	if ((err = activate(fb_info, &var)))
	244	return err;
	245
	246	return count;
	247	}
	248
	249
78cde088 GKH	250	static ssize_t show_rotate(struct device *device,
78cde088 GKH	251	struct device_attribute attr, char buf)
a812c94b	252	{
78cde088	253	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	254
	255	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	256	}
	257
78cde088 GKH	258	static ssize_t store_virtual(struct device *device,
	259	struct device_attribute *attr,
	260	const char *buf, size_t count)
1da177e4	261	{
78cde088	262	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	263	struct fb_var_screeninfo var;
	264	char *last = NULL;
	265	int err;
	266
	267	var = fb_info->var;
	268	var.xres_virtual = simple_strtoul(buf, &last, 0);
	269	last++;
	270	if (last - buf >= count)
	271	return -EINVAL;
	272	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	273
	274	if ((err = activate(fb_info, &var)))
	275	return err;
	276	return count;
	277	}
	278
78cde088 GKH	279	static ssize_t show_virtual(struct device *device,
78cde088 GKH	280	struct device_attribute attr, char buf)
1da177e4	281	{
78cde088	282	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	283	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	284	fb_info->var.yres_virtual);
1da177e4 LT	285	}
1da177e4 LT	286
78cde088 GKH	287	static ssize_t show_stride(struct device *device,
78cde088 GKH	288	struct device_attribute attr, char buf)
c14e2cfc	289	{
78cde088	290	struct fb_info *fb_info = dev_get_drvdata(device);
c14e2cfc JS	291	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	292	}
	293
78cde088 GKH	294	static ssize_t store_blank(struct device *device,
	295	struct device_attribute *attr,
	296	const char *buf, size_t count)
1da177e4	297	{
78cde088	298	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	299	char *last = NULL;
	300	int err;
	301
	302	acquire_console_sem();
	303	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	304	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	305	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	306	release_console_sem();
	307	if (err < 0)
	308	return err;
	309	return count;
	310	}
	311
78cde088 GKH	312	static ssize_t show_blank(struct device *device,
78cde088 GKH	313	struct device_attribute attr, char buf)
1da177e4	314	{
78cde088	315	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	316	return 0;
	317	}
	318
78cde088 GKH	319	static ssize_t store_console(struct device *device,
	320	struct device_attribute *attr,
	321	const char *buf, size_t count)
1da177e4	322	{
78cde088	323	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	324	return 0;
	325	}
	326
78cde088 GKH	327	static ssize_t show_console(struct device *device,
78cde088 GKH	328	struct device_attribute attr, char buf)
1da177e4	329	{
78cde088	330	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	331	return 0;
	332	}
	333
78cde088 GKH	334	static ssize_t store_cursor(struct device *device,
	335	struct device_attribute *attr,
	336	const char *buf, size_t count)
1da177e4	337	{
78cde088	338	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	339	return 0;
	340	}
	341
78cde088 GKH	342	static ssize_t show_cursor(struct device *device,
78cde088 GKH	343	struct device_attribute attr, char buf)
1da177e4	344	{
78cde088	345	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	346	return 0;
	347	}
	348
78cde088 GKH	349	static ssize_t store_pan(struct device *device,
	350	struct device_attribute *attr,
	351	const char *buf, size_t count)
1da177e4	352	{
78cde088	353	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	354	struct fb_var_screeninfo var;
	355	char *last = NULL;
	356	int err;
	357
	358	var = fb_info->var;
	359	var.xoffset = simple_strtoul(buf, &last, 0);
	360	last++;
	361	if (last - buf >= count)
	362	return -EINVAL;
	363	var.yoffset = simple_strtoul(last, &last, 0);
	364
	365	acquire_console_sem();
	366	err = fb_pan_display(fb_info, &var);
	367	release_console_sem();
	368
	369	if (err < 0)
	370	return err;
	371	return count;
	372	}
	373
78cde088 GKH	374	static ssize_t show_pan(struct device *device,
78cde088 GKH	375	struct device_attribute attr, char buf)
1da177e4	376	{
78cde088	377	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	378	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
c4270637	379	fb_info->var.yoffset);
1da177e4 LT	380	}
1da177e4 LT	381
78cde088 GKH	382	static ssize_t show_name(struct device *device,
78cde088 GKH	383	struct device_attribute attr, char buf)
02459eaa	384	{
78cde088	385	struct fb_info *fb_info = dev_get_drvdata(device);
02459eaa JS	386
	387	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	388	}
	389
78cde088 GKH	390	static ssize_t store_fbstate(struct device *device,
	391	struct device_attribute *attr,
	392	const char *buf, size_t count)
30420f8f	393	{
78cde088	394	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	395	u32 state;
	396	char *last = NULL;
	397
	398	state = simple_strtoul(buf, &last, 0);
	399
	400	acquire_console_sem();
	401	fb_set_suspend(fb_info, (int)state);
	402	release_console_sem();
	403
	404	return count;
	405	}
	406
78cde088 GKH	407	static ssize_t show_fbstate(struct device *device,
78cde088 GKH	408	struct device_attribute attr, char buf)
30420f8f	409	{
78cde088	410	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	411	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	412	}
	413
5474c120	414	#ifdef CONFIG_FB_BACKLIGHT
78cde088 GKH	415	static ssize_t store_bl_curve(struct device *device,
	416	struct device_attribute *attr,
	417	const char *buf, size_t count)
5474c120	418	{
78cde088	419	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	420	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	421	unsigned int i;
	422
25981de5 MH	423	/* Some drivers don't use framebuffer_alloc(), but those also
	424	* don't have backlights.
	425	*/
	426	if (!fb_info \|\| !fb_info->bl_dev)
	427	return -ENODEV;
	428
5474c120 MH	429	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	430	return -EINVAL;
	431
	432	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	433	if (sscanf(&buf[i * 24],
	434	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	435	&tmp_curve[i * 8 + 0],
	436	&tmp_curve[i * 8 + 1],
	437	&tmp_curve[i * 8 + 2],
	438	&tmp_curve[i * 8 + 3],
	439	&tmp_curve[i * 8 + 4],
	440	&tmp_curve[i * 8 + 5],
	441	&tmp_curve[i * 8 + 6],
	442	&tmp_curve[i * 8 + 7]) != 8)
	443	return -EINVAL;
	444
	445	/* If there has been an error in the input data, we won't
	446	* reach this loop.
	447	*/
37ce69a5	448	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	449	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
5474c120 MH	450	fb_info->bl_curve[i] = tmp_curve[i];
37ce69a5	451	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	452
	453	return count;
	454	}
	455
78cde088 GKH	456	static ssize_t show_bl_curve(struct device *device,
78cde088 GKH	457	struct device_attribute attr, char buf)
5474c120	458	{
78cde088	459	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	460	ssize_t len = 0;
	461	unsigned int i;
	462
25981de5 MH	463	/* Some drivers don't use framebuffer_alloc(), but those also
	464	* don't have backlights.
	465	*/
	466	if (!fb_info \|\| !fb_info->bl_dev)
	467	return -ENODEV;
	468
37ce69a5	469	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	470	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	471	len += snprintf(&buf[len], PAGE_SIZE,
	472	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	473	fb_info->bl_curve[i + 0],
	474	fb_info->bl_curve[i + 1],
	475	fb_info->bl_curve[i + 2],
	476	fb_info->bl_curve[i + 3],
	477	fb_info->bl_curve[i + 4],
	478	fb_info->bl_curve[i + 5],
	479	fb_info->bl_curve[i + 6],
	480	fb_info->bl_curve[i + 7]);
37ce69a5	481	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	482
	483	return len;
	484	}
	485	#endif
	486
913e7ec5 JS	487	/* When cmap is added back in it should be a binary attribute
	488	* not a text one. Consideration should also be given to converting
	489	* fbdev to use configfs instead of sysfs */
78cde088	490	static struct device_attribute device_attrs[] = {
1da177e4 LT	491	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	492	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	493	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	494	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	495	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	496	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	497	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	498	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	499	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	500	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b	501	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
30420f8f	502	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	503	#ifdef CONFIG_FB_BACKLIGHT
	504	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	505	#endif
1da177e4 LT	506	};
1da177e4 LT	507
78cde088	508	int fb_init_device(struct fb_info *fb_info)
1da177e4	509	{
1a6600be AD	510	int i, error = 0;
1a6600be AD	511
78cde088	512	dev_set_drvdata(fb_info->dev, fb_info);
1da177e4	513
1a6600be AD	514	fb_info->class_flag \|= FB_SYSFS_FLAG_ATTR;
1a6600be AD	515
78cde088 GKH	516	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
78cde088 GKH	517	error = device_create_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	518
	519	if (error)
	520	break;
	521	}
	522
	523	if (error) {
	524	while (--i >= 0)
78cde088	525	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	526	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	527	}
	528
1da177e4 LT	529	return 0;
	530	}
	531
78cde088	532	void fb_cleanup_device(struct fb_info *fb_info)
1da177e4 LT	533	{
	534	unsigned int i;
	535
1a6600be	536	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
78cde088 GKH	537	for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
78cde088 GKH	538	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	539
	540	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	541	}
1da177e4 LT	542	}
1da177e4 LT	543
5474c120 MH	544	#ifdef CONFIG_FB_BACKLIGHT
	545	/* This function generates a linear backlight curve
	546	*
	547	* 0: off
	548	* 1-7: min
	549	* 8-127: linear from min to max
	550	*/
	551	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	552	{
	553	unsigned int i, flat, count, range = (max - min);
	554
37ce69a5 RP	555	mutex_lock(&fb_info->bl_curve_mutex);
37ce69a5 RP	556
5474c120	557	fb_info->bl_curve[0] = off;
1da177e4	558
5474c120 MH	559	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	560	fb_info->bl_curve[flat] = min;
	561
	562	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	563	for (i = 0; i < count; ++i)
	564	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
37ce69a5 RP	565
37ce69a5 RP	566	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	567	}
	568	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	569	#endif