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

#define FB_SYSFS_FLAG_ATTR 1

/**
 * framebuffer_alloc - creates a new frame buffer info structure
 *
 * @size: size of driver private data, can be zero
 * @dev: pointer to the device for this fb, this can be NULL
 *
 * Creates a new frame buffer info structure. Also reserves @size bytes
 * for driver private data (info->par). info->par (if any) will be
 * aligned to sizeof(long).
 *
 * Returns the new structure, or NULL if an error occurred.
 *
 */
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)
{
	if (!info)
		return;
	kfree(info->apertures);
	kfree(info);
}
EXPORT_SYMBOL(framebuffer_release);

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

	var->activate |= FB_ACTIVATE_FORCE;
	console_lock();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_set_var(fb_info, var);
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	console_unlock();
	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;

	console_lock();
	if (!lock_fb_info(fb_info)) {
		console_unlock();
		return -ENODEV;
	}

	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);

	unlock_fb_info(fb_info);
	console_unlock();

	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;

	console_lock();
	fb_info->flags |= FBINFO_MISC_USEREVENT;
	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
	console_unlock();
	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);

	console_lock();
	err = fb_pan_display(fb_info, &var);
	console_unlock();

	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);

	console_lock();
	if (!lock_fb_info(fb_info)) {
		console_unlock();
		return -ENODEV;
	}

	fb_set_suspend(fb_info, (int)state);

	unlock_fb_info(fb_info);
	console_unlock();

	return count;
}

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

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

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

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

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

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

	return count;
}

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

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

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

	return len;
}
#endif

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

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

	dev_set_drvdata(fb_info->dev, fb_info);

	fb_info->class_flag |= FB_SYSFS_FLAG_ATTR;

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

		if (error)
			break;
	}

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

	return 0;
}

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

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

		fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	}
}

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

	mutex_lock(&fb_info->bl_curve_mutex);

	fb_info->bl_curve[0] = off;

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

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

	mutex_unlock(&fb_info->bl_curve_mutex);
}
EXPORT_SYMBOL_GPL(fb_bl_default_curve);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fbsysfs.c - framebuffer device class and attributes
	3	*
	4	* Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
	5	*
	6	* This program is free software you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	/*
	13	* Note: currently there's only stubs for framebuffer_alloc and
	14	* framebuffer_release here. The reson for that is that until all drivers
	15	* are converted to use it a sysfsification will open OOPSable races.
	16	*/
	17
	18	#include <linux/kernel.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20	#include <linux/fb.h>
1da177e4 LT	21	#include <linux/console.h>
5474c120	22	#include <linux/module.h>
1da177e4	23
1a6600be AD	24	#define FB_SYSFS_FLAG_ATTR 1
1a6600be AD	25
1da177e4 LT	26	/**
	27	* framebuffer_alloc - creates a new frame buffer info structure
	28	*
	29	* @size: size of driver private data, can be zero
	30	* @dev: pointer to the device for this fb, this can be NULL
	31	*
	32	* Creates a new frame buffer info structure. Also reserves @size bytes
	33	* for driver private data (info->par). info->par (if any) will be
	34	* aligned to sizeof(long).
	35	*
25985edc	36	* Returns the new structure, or NULL if an error occurred.
1da177e4 LT	37	*
	38	*/
	39	struct fb_info framebuffer_alloc(size_t size, struct device dev)
	40	{
	41	#define BYTES_PER_LONG (BITS_PER_LONG/8)
	42	#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
	43	int fb_info_size = sizeof(struct fb_info);
	44	struct fb_info *info;
	45	char *p;
	46
	47	if (size)
	48	fb_info_size += PADDING;
	49
def1eded AD	50	p = kzalloc(fb_info_size + size, GFP_KERNEL);
def1eded AD	51
1da177e4 LT	52	if (!p)
1da177e4 LT	53	return NULL;
def1eded	54
1da177e4 LT	55	info = (struct fb_info *) p;
	56
	57	if (size)
	58	info->par = p + fb_info_size;
	59
	60	info->device = dev;
	61
5474c120	62	#ifdef CONFIG_FB_BACKLIGHT
37ce69a5	63	mutex_init(&info->bl_curve_mutex);
5474c120 MH	64	#endif
5474c120 MH	65
1da177e4 LT	66	return info;
	67	#undef PADDING
	68	#undef BYTES_PER_LONG
	69	}
	70	EXPORT_SYMBOL(framebuffer_alloc);
	71
	72	/**
	73	* framebuffer_release - marks the structure available for freeing
	74	*
	75	* @info: frame buffer info structure
	76	*
78cde088	77	* Drop the reference count of the device embedded in the
1da177e4 LT	78	* framebuffer info structure.
	79	*
	80	*/
	81	void framebuffer_release(struct fb_info *info)
	82	{
cc440114 DC	83	if (!info)
cc440114 DC	84	return;
1471ca9a	85	kfree(info->apertures);
1da177e4 LT	86	kfree(info);
	87	}
	88	EXPORT_SYMBOL(framebuffer_release);
	89
	90	static int activate(struct fb_info fb_info, struct fb_var_screeninfo var)
	91	{
	92	int err;
	93
	94	var->activate \|= FB_ACTIVATE_FORCE;
ac751efa	95	console_lock();
1da177e4 LT	96	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	97	err = fb_set_var(fb_info, var);
	98	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
ac751efa	99	console_unlock();
1da177e4 LT	100	if (err)
	101	return err;
	102	return 0;
	103	}
	104
	105	static int mode_string(char *buf, unsigned int offset,
	106	const struct fb_videomode *mode)
	107	{
	108	char m = 'U';
9dac73a4 DT	109	char v = 'p';
9dac73a4 DT	110
1da177e4 LT	111	if (mode->flag & FB_MODE_IS_DETAILED)
	112	m = 'D';
	113	if (mode->flag & FB_MODE_IS_VESA)
	114	m = 'V';
	115	if (mode->flag & FB_MODE_IS_STANDARD)
	116	m = 'S';
9dac73a4 DT	117
	118	if (mode->vmode & FB_VMODE_INTERLACED)
	119	v = 'i';
	120	if (mode->vmode & FB_VMODE_DOUBLE)
	121	v = 'd';
	122
	123	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	124	m, mode->xres, mode->yres, v, mode->refresh);
1da177e4 LT	125	}
1da177e4 LT	126
78cde088 GKH	127	static ssize_t store_mode(struct device device, struct device_attribute attr,
78cde088 GKH	128	const char *buf, size_t count)
1da177e4	129	{
78cde088	130	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	131	char mstr[100];
	132	struct fb_var_screeninfo var;
	133	struct fb_modelist *modelist;
	134	struct fb_videomode *mode;
	135	struct list_head *pos;
	136	size_t i;
	137	int err;
	138
	139	memset(&var, 0, sizeof(var));
	140
	141	list_for_each(pos, &fb_info->modelist) {
	142	modelist = list_entry(pos, struct fb_modelist, list);
	143	mode = &modelist->mode;
	144	i = mode_string(mstr, 0, mode);
	145	if (strncmp(mstr, buf, max(count, i)) == 0) {
	146
	147	var = fb_info->var;
	148	fb_videomode_to_var(&var, mode);
	149	if ((err = activate(fb_info, &var)))
	150	return err;
	151	fb_info->mode = mode;
	152	return count;
	153	}
	154	}
	155	return -EINVAL;
	156	}
	157
78cde088 GKH	158	static ssize_t show_mode(struct device device, struct device_attribute attr,
78cde088 GKH	159	char *buf)
1da177e4	160	{
78cde088	161	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	162
	163	if (!fb_info->mode)
	164	return 0;
	165
	166	return mode_string(buf, 0, fb_info->mode);
	167	}
	168
78cde088 GKH	169	static ssize_t store_modes(struct device *device,
	170	struct device_attribute *attr,
	171	const char *buf, size_t count)
1da177e4	172	{
78cde088	173	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	174	LIST_HEAD(old_list);
	175	int i = count / sizeof(struct fb_videomode);
	176
	177	if (i * sizeof(struct fb_videomode) != count)
	178	return -EINVAL;
	179
ac751efa	180	console_lock();
3a41c5db GZ	181	if (!lock_fb_info(fb_info)) {
	182	console_unlock();
	183	return -ENODEV;
	184	}
	185
1da177e4	186	list_splice(&fb_info->modelist, &old_list);
9791d763	187	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
1da177e4 LT	188	&fb_info->modelist);
	189	if (fb_new_modelist(fb_info)) {
	190	fb_destroy_modelist(&fb_info->modelist);
	191	list_splice(&old_list, &fb_info->modelist);
	192	} else
	193	fb_destroy_modelist(&old_list);
	194
50e244cc	195	unlock_fb_info(fb_info);
3a41c5db	196	console_unlock();
1da177e4 LT	197
	198	return 0;
	199	}
	200
78cde088 GKH	201	static ssize_t show_modes(struct device device, struct device_attribute attr,
78cde088 GKH	202	char *buf)
1da177e4	203	{
78cde088	204	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	205	unsigned int i;
	206	struct list_head *pos;
	207	struct fb_modelist *modelist;
	208	const struct fb_videomode *mode;
	209
	210	i = 0;
	211	list_for_each(pos, &fb_info->modelist) {
	212	modelist = list_entry(pos, struct fb_modelist, list);
	213	mode = &modelist->mode;
	214	i += mode_string(buf, i, mode);
	215	}
	216	return i;
	217	}
	218
78cde088 GKH	219	static ssize_t store_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	220	const char *buf, size_t count)
1da177e4	221	{
78cde088	222	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	223	struct fb_var_screeninfo var;
	224	char ** last = NULL;
	225	int err;
	226
	227	var = fb_info->var;
	228	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	229	if ((err = activate(fb_info, &var)))
	230	return err;
	231	return count;
	232	}
	233
78cde088 GKH	234	static ssize_t show_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	235	char *buf)
1da177e4	236	{
78cde088	237	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	238	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	239	}
	240
78cde088 GKH	241	static ssize_t store_rotate(struct device *device,
	242	struct device_attribute *attr,
	243	const char *buf, size_t count)
a812c94b	244	{
78cde088	245	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	246	struct fb_var_screeninfo var;
	247	char **last = NULL;
	248	int err;
	249
	250	var = fb_info->var;
	251	var.rotate = simple_strtoul(buf, last, 0);
	252
	253	if ((err = activate(fb_info, &var)))
	254	return err;
	255
	256	return count;
	257	}
	258
	259
78cde088 GKH	260	static ssize_t show_rotate(struct device *device,
78cde088 GKH	261	struct device_attribute attr, char buf)
a812c94b	262	{
78cde088	263	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	264
	265	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	266	}
	267
78cde088 GKH	268	static ssize_t store_virtual(struct device *device,
	269	struct device_attribute *attr,
	270	const char *buf, size_t count)
1da177e4	271	{
78cde088	272	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	273	struct fb_var_screeninfo var;
	274	char *last = NULL;
	275	int err;
	276
	277	var = fb_info->var;
	278	var.xres_virtual = simple_strtoul(buf, &last, 0);
	279	last++;
	280	if (last - buf >= count)
	281	return -EINVAL;
	282	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	283
	284	if ((err = activate(fb_info, &var)))
	285	return err;
	286	return count;
	287	}
	288
78cde088 GKH	289	static ssize_t show_virtual(struct device *device,
78cde088 GKH	290	struct device_attribute attr, char buf)
1da177e4	291	{
78cde088	292	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	293	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	294	fb_info->var.yres_virtual);
1da177e4 LT	295	}
1da177e4 LT	296
78cde088 GKH	297	static ssize_t show_stride(struct device *device,
78cde088 GKH	298	struct device_attribute attr, char buf)
c14e2cfc	299	{
78cde088	300	struct fb_info *fb_info = dev_get_drvdata(device);
c14e2cfc JS	301	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	302	}
	303
78cde088 GKH	304	static ssize_t store_blank(struct device *device,
	305	struct device_attribute *attr,
	306	const char *buf, size_t count)
1da177e4	307	{
78cde088	308	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	309	char *last = NULL;
	310	int err;
	311
ac751efa	312	console_lock();
1da177e4 LT	313	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	314	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	315	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
ac751efa	316	console_unlock();
1da177e4 LT	317	if (err < 0)
	318	return err;
	319	return count;
	320	}
	321
78cde088 GKH	322	static ssize_t show_blank(struct device *device,
78cde088 GKH	323	struct device_attribute attr, char buf)
1da177e4	324	{
78cde088	325	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	326	return 0;
	327	}
	328
78cde088 GKH	329	static ssize_t store_console(struct device *device,
	330	struct device_attribute *attr,
	331	const char *buf, size_t count)
1da177e4	332	{
78cde088	333	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	334	return 0;
	335	}
	336
78cde088 GKH	337	static ssize_t show_console(struct device *device,
78cde088 GKH	338	struct device_attribute attr, char buf)
1da177e4	339	{
78cde088	340	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	341	return 0;
	342	}
	343
78cde088 GKH	344	static ssize_t store_cursor(struct device *device,
	345	struct device_attribute *attr,
	346	const char *buf, size_t count)
1da177e4	347	{
78cde088	348	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	349	return 0;
	350	}
	351
78cde088 GKH	352	static ssize_t show_cursor(struct device *device,
78cde088 GKH	353	struct device_attribute attr, char buf)
1da177e4	354	{
78cde088	355	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	356	return 0;
	357	}
	358
78cde088 GKH	359	static ssize_t store_pan(struct device *device,
	360	struct device_attribute *attr,
	361	const char *buf, size_t count)
1da177e4	362	{
78cde088	363	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	364	struct fb_var_screeninfo var;
	365	char *last = NULL;
	366	int err;
	367
	368	var = fb_info->var;
	369	var.xoffset = simple_strtoul(buf, &last, 0);
	370	last++;
	371	if (last - buf >= count)
	372	return -EINVAL;
	373	var.yoffset = simple_strtoul(last, &last, 0);
	374
ac751efa	375	console_lock();
1da177e4	376	err = fb_pan_display(fb_info, &var);
ac751efa	377	console_unlock();
1da177e4 LT	378
	379	if (err < 0)
	380	return err;
	381	return count;
	382	}
	383
78cde088 GKH	384	static ssize_t show_pan(struct device *device,
78cde088 GKH	385	struct device_attribute attr, char buf)
1da177e4	386	{
78cde088	387	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	388	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
c4270637	389	fb_info->var.yoffset);
1da177e4 LT	390	}
1da177e4 LT	391
78cde088 GKH	392	static ssize_t show_name(struct device *device,
78cde088 GKH	393	struct device_attribute attr, char buf)
02459eaa	394	{
78cde088	395	struct fb_info *fb_info = dev_get_drvdata(device);
02459eaa JS	396
	397	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	398	}
	399
78cde088 GKH	400	static ssize_t store_fbstate(struct device *device,
	401	struct device_attribute *attr,
	402	const char *buf, size_t count)
30420f8f	403	{
78cde088	404	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	405	u32 state;
	406	char *last = NULL;
	407
	408	state = simple_strtoul(buf, &last, 0);
	409
ac751efa	410	console_lock();
3a41c5db GZ	411	if (!lock_fb_info(fb_info)) {
	412	console_unlock();
	413	return -ENODEV;
	414	}
	415
30420f8f	416	fb_set_suspend(fb_info, (int)state);
3a41c5db	417
9e769ff3	418	unlock_fb_info(fb_info);
3a41c5db	419	console_unlock();
30420f8f MG	420
	421	return count;
	422	}
	423
78cde088 GKH	424	static ssize_t show_fbstate(struct device *device,
78cde088 GKH	425	struct device_attribute attr, char buf)
30420f8f	426	{
78cde088	427	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	428	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	429	}
	430
5474c120	431	#ifdef CONFIG_FB_BACKLIGHT
78cde088 GKH	432	static ssize_t store_bl_curve(struct device *device,
	433	struct device_attribute *attr,
	434	const char *buf, size_t count)
5474c120	435	{
78cde088	436	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	437	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	438	unsigned int i;
	439
25981de5 MH	440	/* Some drivers don't use framebuffer_alloc(), but those also
	441	* don't have backlights.
	442	*/
	443	if (!fb_info \|\| !fb_info->bl_dev)
	444	return -ENODEV;
	445
5474c120 MH	446	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	447	return -EINVAL;
	448
	449	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	450	if (sscanf(&buf[i * 24],
	451	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	452	&tmp_curve[i * 8 + 0],
	453	&tmp_curve[i * 8 + 1],
	454	&tmp_curve[i * 8 + 2],
	455	&tmp_curve[i * 8 + 3],
	456	&tmp_curve[i * 8 + 4],
	457	&tmp_curve[i * 8 + 5],
	458	&tmp_curve[i * 8 + 6],
	459	&tmp_curve[i * 8 + 7]) != 8)
	460	return -EINVAL;
	461
	462	/* If there has been an error in the input data, we won't
	463	* reach this loop.
	464	*/
37ce69a5	465	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	466	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
5474c120 MH	467	fb_info->bl_curve[i] = tmp_curve[i];
37ce69a5	468	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	469
	470	return count;
	471	}
	472
78cde088 GKH	473	static ssize_t show_bl_curve(struct device *device,
78cde088 GKH	474	struct device_attribute attr, char buf)
5474c120	475	{
78cde088	476	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	477	ssize_t len = 0;
	478	unsigned int i;
	479
25981de5 MH	480	/* Some drivers don't use framebuffer_alloc(), but those also
	481	* don't have backlights.
	482	*/
	483	if (!fb_info \|\| !fb_info->bl_dev)
	484	return -ENODEV;
	485
37ce69a5	486	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	487	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	488	len += snprintf(&buf[len], PAGE_SIZE,
	489	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	490	fb_info->bl_curve[i + 0],
	491	fb_info->bl_curve[i + 1],
	492	fb_info->bl_curve[i + 2],
	493	fb_info->bl_curve[i + 3],
	494	fb_info->bl_curve[i + 4],
	495	fb_info->bl_curve[i + 5],
	496	fb_info->bl_curve[i + 6],
	497	fb_info->bl_curve[i + 7]);
37ce69a5	498	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	499
	500	return len;
	501	}
	502	#endif
	503
913e7ec5 JS	504	/* When cmap is added back in it should be a binary attribute
	505	* not a text one. Consideration should also be given to converting
	506	* fbdev to use configfs instead of sysfs */
78cde088	507	static struct device_attribute device_attrs[] = {
1da177e4 LT	508	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	509	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	510	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	511	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	512	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	513	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	514	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	515	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	516	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	517	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b	518	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
30420f8f	519	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
5474c120 MH	520	#ifdef CONFIG_FB_BACKLIGHT
	521	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	522	#endif
1da177e4 LT	523	};
1da177e4 LT	524
78cde088	525	int fb_init_device(struct fb_info *fb_info)
1da177e4	526	{
1a6600be AD	527	int i, error = 0;
1a6600be AD	528
78cde088	529	dev_set_drvdata(fb_info->dev, fb_info);
1da177e4	530
1a6600be AD	531	fb_info->class_flag \|= FB_SYSFS_FLAG_ATTR;
1a6600be AD	532
78cde088 GKH	533	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
78cde088 GKH	534	error = device_create_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	535
	536	if (error)
	537	break;
	538	}
	539
	540	if (error) {
	541	while (--i >= 0)
78cde088	542	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	543	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	544	}
	545
1da177e4 LT	546	return 0;
	547	}
	548
78cde088	549	void fb_cleanup_device(struct fb_info *fb_info)
1da177e4 LT	550	{
	551	unsigned int i;
	552
1a6600be	553	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
78cde088 GKH	554	for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
78cde088 GKH	555	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	556
	557	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	558	}
1da177e4 LT	559	}
1da177e4 LT	560
5474c120 MH	561	#ifdef CONFIG_FB_BACKLIGHT
	562	/* This function generates a linear backlight curve
	563	*
	564	* 0: off
	565	* 1-7: min
	566	* 8-127: linear from min to max
	567	*/
	568	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	569	{
	570	unsigned int i, flat, count, range = (max - min);
	571
37ce69a5 RP	572	mutex_lock(&fb_info->bl_curve_mutex);
37ce69a5 RP	573
5474c120	574	fb_info->bl_curve[0] = off;
1da177e4	575
5474c120 MH	576	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	577	fb_info->bl_curve[flat] = min;
	578
	579	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	580	for (i = 0; i < count; ++i)
	581	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
37ce69a5 RP	582
37ce69a5 RP	583	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	584	}
	585	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	586	#endif