[mirror_ubuntu-disco-kernel.git] / drivers / video / fbdev / core / 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;
	info->fbcon_rotate_hint = -1;

#if IS_ENABLED(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);
}

#if IS_ENABLED(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 += scnprintf(&buf[len], PAGE_SIZE - len, "%8ph\n",
				fb_info->bl_curve + i);
	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),
#if IS_ENABLED(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;
	}
}

#if IS_ENABLED(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;
c9e6a364	61	info->fbcon_rotate_hint = -1;
1da177e4	62
b4a1ed0c	63	#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
37ce69a5	64	mutex_init(&info->bl_curve_mutex);
5474c120 MH	65	#endif
5474c120 MH	66
1da177e4 LT	67	return info;
	68	#undef PADDING
	69	#undef BYTES_PER_LONG
	70	}
	71	EXPORT_SYMBOL(framebuffer_alloc);
	72
	73	/**
	74	* framebuffer_release - marks the structure available for freeing
	75	*
	76	* @info: frame buffer info structure
	77	*
78cde088	78	* Drop the reference count of the device embedded in the
1da177e4 LT	79	* framebuffer info structure.
	80	*
	81	*/
	82	void framebuffer_release(struct fb_info *info)
	83	{
cc440114 DC	84	if (!info)
cc440114 DC	85	return;
1471ca9a	86	kfree(info->apertures);
1da177e4 LT	87	kfree(info);
	88	}
	89	EXPORT_SYMBOL(framebuffer_release);
	90
	91	static int activate(struct fb_info fb_info, struct fb_var_screeninfo var)
	92	{
	93	int err;
	94
	95	var->activate \|= FB_ACTIVATE_FORCE;
ac751efa	96	console_lock();
1da177e4 LT	97	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	98	err = fb_set_var(fb_info, var);
	99	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
ac751efa	100	console_unlock();
1da177e4 LT	101	if (err)
	102	return err;
	103	return 0;
	104	}
	105
	106	static int mode_string(char *buf, unsigned int offset,
	107	const struct fb_videomode *mode)
	108	{
	109	char m = 'U';
9dac73a4 DT	110	char v = 'p';
9dac73a4 DT	111
1da177e4 LT	112	if (mode->flag & FB_MODE_IS_DETAILED)
	113	m = 'D';
	114	if (mode->flag & FB_MODE_IS_VESA)
	115	m = 'V';
	116	if (mode->flag & FB_MODE_IS_STANDARD)
	117	m = 'S';
9dac73a4 DT	118
	119	if (mode->vmode & FB_VMODE_INTERLACED)
	120	v = 'i';
	121	if (mode->vmode & FB_VMODE_DOUBLE)
	122	v = 'd';
	123
	124	return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
	125	m, mode->xres, mode->yres, v, mode->refresh);
1da177e4 LT	126	}
1da177e4 LT	127
78cde088 GKH	128	static ssize_t store_mode(struct device device, struct device_attribute attr,
78cde088 GKH	129	const char *buf, size_t count)
1da177e4	130	{
78cde088	131	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	132	char mstr[100];
	133	struct fb_var_screeninfo var;
	134	struct fb_modelist *modelist;
	135	struct fb_videomode *mode;
	136	struct list_head *pos;
	137	size_t i;
	138	int err;
	139
	140	memset(&var, 0, sizeof(var));
	141
	142	list_for_each(pos, &fb_info->modelist) {
	143	modelist = list_entry(pos, struct fb_modelist, list);
	144	mode = &modelist->mode;
	145	i = mode_string(mstr, 0, mode);
	146	if (strncmp(mstr, buf, max(count, i)) == 0) {
	147
	148	var = fb_info->var;
	149	fb_videomode_to_var(&var, mode);
	150	if ((err = activate(fb_info, &var)))
	151	return err;
	152	fb_info->mode = mode;
	153	return count;
	154	}
	155	}
	156	return -EINVAL;
	157	}
	158
78cde088 GKH	159	static ssize_t show_mode(struct device device, struct device_attribute attr,
78cde088 GKH	160	char *buf)
1da177e4	161	{
78cde088	162	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	163
	164	if (!fb_info->mode)
	165	return 0;
	166
	167	return mode_string(buf, 0, fb_info->mode);
	168	}
	169
78cde088 GKH	170	static ssize_t store_modes(struct device *device,
	171	struct device_attribute *attr,
	172	const char *buf, size_t count)
1da177e4	173	{
78cde088	174	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	175	LIST_HEAD(old_list);
	176	int i = count / sizeof(struct fb_videomode);
	177
	178	if (i * sizeof(struct fb_videomode) != count)
	179	return -EINVAL;
	180
ac751efa	181	console_lock();
3a41c5db GZ	182	if (!lock_fb_info(fb_info)) {
	183	console_unlock();
	184	return -ENODEV;
	185	}
	186
1da177e4	187	list_splice(&fb_info->modelist, &old_list);
9791d763	188	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
1da177e4 LT	189	&fb_info->modelist);
	190	if (fb_new_modelist(fb_info)) {
	191	fb_destroy_modelist(&fb_info->modelist);
	192	list_splice(&old_list, &fb_info->modelist);
	193	} else
	194	fb_destroy_modelist(&old_list);
	195
50e244cc	196	unlock_fb_info(fb_info);
3a41c5db	197	console_unlock();
1da177e4 LT	198
	199	return 0;
	200	}
	201
78cde088 GKH	202	static ssize_t show_modes(struct device device, struct device_attribute attr,
78cde088 GKH	203	char *buf)
1da177e4	204	{
78cde088	205	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	206	unsigned int i;
	207	struct list_head *pos;
	208	struct fb_modelist *modelist;
	209	const struct fb_videomode *mode;
	210
	211	i = 0;
	212	list_for_each(pos, &fb_info->modelist) {
	213	modelist = list_entry(pos, struct fb_modelist, list);
	214	mode = &modelist->mode;
	215	i += mode_string(buf, i, mode);
	216	}
	217	return i;
	218	}
	219
78cde088 GKH	220	static ssize_t store_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	221	const char *buf, size_t count)
1da177e4	222	{
78cde088	223	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	224	struct fb_var_screeninfo var;
	225	char ** last = NULL;
	226	int err;
	227
	228	var = fb_info->var;
	229	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	230	if ((err = activate(fb_info, &var)))
	231	return err;
	232	return count;
	233	}
	234
78cde088 GKH	235	static ssize_t show_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	236	char *buf)
1da177e4	237	{
78cde088	238	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	239	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	240	}
	241
78cde088 GKH	242	static ssize_t store_rotate(struct device *device,
	243	struct device_attribute *attr,
	244	const char *buf, size_t count)
a812c94b	245	{
78cde088	246	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	247	struct fb_var_screeninfo var;
	248	char **last = NULL;
	249	int err;
	250
	251	var = fb_info->var;
	252	var.rotate = simple_strtoul(buf, last, 0);
	253
	254	if ((err = activate(fb_info, &var)))
	255	return err;
	256
	257	return count;
	258	}
	259
	260
78cde088 GKH	261	static ssize_t show_rotate(struct device *device,
78cde088 GKH	262	struct device_attribute attr, char buf)
a812c94b	263	{
78cde088	264	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	265
	266	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	267	}
	268
78cde088 GKH	269	static ssize_t store_virtual(struct device *device,
	270	struct device_attribute *attr,
	271	const char *buf, size_t count)
1da177e4	272	{
78cde088	273	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	274	struct fb_var_screeninfo var;
	275	char *last = NULL;
	276	int err;
	277
	278	var = fb_info->var;
	279	var.xres_virtual = simple_strtoul(buf, &last, 0);
	280	last++;
	281	if (last - buf >= count)
	282	return -EINVAL;
	283	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	284
	285	if ((err = activate(fb_info, &var)))
	286	return err;
	287	return count;
	288	}
	289
78cde088 GKH	290	static ssize_t show_virtual(struct device *device,
78cde088 GKH	291	struct device_attribute attr, char buf)
1da177e4	292	{
78cde088	293	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	294	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	295	fb_info->var.yres_virtual);
1da177e4 LT	296	}
1da177e4 LT	297
78cde088 GKH	298	static ssize_t show_stride(struct device *device,
78cde088 GKH	299	struct device_attribute attr, char buf)
c14e2cfc	300	{
78cde088	301	struct fb_info *fb_info = dev_get_drvdata(device);
c14e2cfc JS	302	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	303	}
	304
78cde088 GKH	305	static ssize_t store_blank(struct device *device,
	306	struct device_attribute *attr,
	307	const char *buf, size_t count)
1da177e4	308	{
78cde088	309	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	310	char *last = NULL;
	311	int err;
	312
ac751efa	313	console_lock();
1da177e4 LT	314	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	315	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	316	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
ac751efa	317	console_unlock();
1da177e4 LT	318	if (err < 0)
	319	return err;
	320	return count;
	321	}
	322
78cde088 GKH	323	static ssize_t show_blank(struct device *device,
78cde088 GKH	324	struct device_attribute attr, char buf)
1da177e4	325	{
78cde088	326	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	327	return 0;
	328	}
	329
78cde088 GKH	330	static ssize_t store_console(struct device *device,
	331	struct device_attribute *attr,
	332	const char *buf, size_t count)
1da177e4	333	{
78cde088	334	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	335	return 0;
	336	}
	337
78cde088 GKH	338	static ssize_t show_console(struct device *device,
78cde088 GKH	339	struct device_attribute attr, char buf)
1da177e4	340	{
78cde088	341	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	342	return 0;
	343	}
	344
78cde088 GKH	345	static ssize_t store_cursor(struct device *device,
	346	struct device_attribute *attr,
	347	const char *buf, size_t count)
1da177e4	348	{
78cde088	349	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	350	return 0;
	351	}
	352
78cde088 GKH	353	static ssize_t show_cursor(struct device *device,
78cde088 GKH	354	struct device_attribute attr, char buf)
1da177e4	355	{
78cde088	356	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	357	return 0;
	358	}
	359
78cde088 GKH	360	static ssize_t store_pan(struct device *device,
	361	struct device_attribute *attr,
	362	const char *buf, size_t count)
1da177e4	363	{
78cde088	364	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	365	struct fb_var_screeninfo var;
	366	char *last = NULL;
	367	int err;
	368
	369	var = fb_info->var;
	370	var.xoffset = simple_strtoul(buf, &last, 0);
	371	last++;
	372	if (last - buf >= count)
	373	return -EINVAL;
	374	var.yoffset = simple_strtoul(last, &last, 0);
	375
ac751efa	376	console_lock();
1da177e4	377	err = fb_pan_display(fb_info, &var);
ac751efa	378	console_unlock();
1da177e4 LT	379
	380	if (err < 0)
	381	return err;
	382	return count;
	383	}
	384
78cde088 GKH	385	static ssize_t show_pan(struct device *device,
78cde088 GKH	386	struct device_attribute attr, char buf)
1da177e4	387	{
78cde088	388	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	389	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
c4270637	390	fb_info->var.yoffset);
1da177e4 LT	391	}
1da177e4 LT	392
78cde088 GKH	393	static ssize_t show_name(struct device *device,
78cde088 GKH	394	struct device_attribute attr, char buf)
02459eaa	395	{
78cde088	396	struct fb_info *fb_info = dev_get_drvdata(device);
02459eaa JS	397
	398	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	399	}
	400
78cde088 GKH	401	static ssize_t store_fbstate(struct device *device,
	402	struct device_attribute *attr,
	403	const char *buf, size_t count)
30420f8f	404	{
78cde088	405	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	406	u32 state;
	407	char *last = NULL;
	408
	409	state = simple_strtoul(buf, &last, 0);
	410
ac751efa	411	console_lock();
3a41c5db GZ	412	if (!lock_fb_info(fb_info)) {
	413	console_unlock();
	414	return -ENODEV;
	415	}
	416
30420f8f	417	fb_set_suspend(fb_info, (int)state);
3a41c5db	418
9e769ff3	419	unlock_fb_info(fb_info);
3a41c5db	420	console_unlock();
30420f8f MG	421
	422	return count;
	423	}
	424
78cde088 GKH	425	static ssize_t show_fbstate(struct device *device,
78cde088 GKH	426	struct device_attribute attr, char buf)
30420f8f	427	{
78cde088	428	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	429	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	430	}
	431
b4a1ed0c	432	#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
78cde088 GKH	433	static ssize_t store_bl_curve(struct device *device,
	434	struct device_attribute *attr,
	435	const char *buf, size_t count)
5474c120	436	{
78cde088	437	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	438	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	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	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	448	return -EINVAL;
	449
	450	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	451	if (sscanf(&buf[i * 24],
	452	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	453	&tmp_curve[i * 8 + 0],
	454	&tmp_curve[i * 8 + 1],
	455	&tmp_curve[i * 8 + 2],
	456	&tmp_curve[i * 8 + 3],
	457	&tmp_curve[i * 8 + 4],
	458	&tmp_curve[i * 8 + 5],
	459	&tmp_curve[i * 8 + 6],
	460	&tmp_curve[i * 8 + 7]) != 8)
	461	return -EINVAL;
	462
	463	/* If there has been an error in the input data, we won't
	464	* reach this loop.
	465	*/
37ce69a5	466	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	467	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
5474c120 MH	468	fb_info->bl_curve[i] = tmp_curve[i];
37ce69a5	469	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	470
	471	return count;
	472	}
	473
78cde088 GKH	474	static ssize_t show_bl_curve(struct device *device,
78cde088 GKH	475	struct device_attribute attr, char buf)
5474c120	476	{
78cde088	477	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	478	ssize_t len = 0;
	479	unsigned int i;
	480
25981de5 MH	481	/* Some drivers don't use framebuffer_alloc(), but those also
	482	* don't have backlights.
	483	*/
	484	if (!fb_info \|\| !fb_info->bl_dev)
	485	return -ENODEV;
	486
37ce69a5	487	mutex_lock(&fb_info->bl_curve_mutex);
5474c120	488	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
b4df2047	489	len += scnprintf(&buf[len], PAGE_SIZE - len, "%8ph\n",
30296f61	490	fb_info->bl_curve + i);
37ce69a5	491	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	492
	493	return len;
	494	}
	495	#endif
	496
913e7ec5 JS	497	/* When cmap is added back in it should be a binary attribute
	498	* not a text one. Consideration should also be given to converting
	499	* fbdev to use configfs instead of sysfs */
78cde088	500	static struct device_attribute device_attrs[] = {
1da177e4 LT	501	__ATTR(bits_per_pixel, S_IRUGO\|S_IWUSR, show_bpp, store_bpp),
1da177e4 LT	502	__ATTR(blank, S_IRUGO\|S_IWUSR, show_blank, store_blank),
1da177e4 LT	503	__ATTR(console, S_IRUGO\|S_IWUSR, show_console, store_console),
	504	__ATTR(cursor, S_IRUGO\|S_IWUSR, show_cursor, store_cursor),
	505	__ATTR(mode, S_IRUGO\|S_IWUSR, show_mode, store_mode),
	506	__ATTR(modes, S_IRUGO\|S_IWUSR, show_modes, store_modes),
	507	__ATTR(pan, S_IRUGO\|S_IWUSR, show_pan, store_pan),
	508	__ATTR(virtual_size, S_IRUGO\|S_IWUSR, show_virtual, store_virtual),
02459eaa	509	__ATTR(name, S_IRUGO, show_name, NULL),
c14e2cfc	510	__ATTR(stride, S_IRUGO, show_stride, NULL),
a812c94b	511	__ATTR(rotate, S_IRUGO\|S_IWUSR, show_rotate, store_rotate),
30420f8f	512	__ATTR(state, S_IRUGO\|S_IWUSR, show_fbstate, store_fbstate),
b4a1ed0c	513	#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
5474c120 MH	514	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
5474c120 MH	515	#endif
1da177e4 LT	516	};
1da177e4 LT	517
78cde088	518	int fb_init_device(struct fb_info *fb_info)
1da177e4	519	{
1a6600be AD	520	int i, error = 0;
1a6600be AD	521
78cde088	522	dev_set_drvdata(fb_info->dev, fb_info);
1da177e4	523
1a6600be AD	524	fb_info->class_flag \|= FB_SYSFS_FLAG_ATTR;
1a6600be AD	525
78cde088 GKH	526	for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
78cde088 GKH	527	error = device_create_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	528
	529	if (error)
	530	break;
	531	}
	532
	533	if (error) {
	534	while (--i >= 0)
78cde088	535	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	536	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	537	}
	538
1da177e4 LT	539	return 0;
	540	}
	541
78cde088	542	void fb_cleanup_device(struct fb_info *fb_info)
1da177e4 LT	543	{
	544	unsigned int i;
	545
1a6600be	546	if (fb_info->class_flag & FB_SYSFS_FLAG_ATTR) {
78cde088 GKH	547	for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
78cde088 GKH	548	device_remove_file(fb_info->dev, &device_attrs[i]);
1a6600be AD	549
	550	fb_info->class_flag &= ~FB_SYSFS_FLAG_ATTR;
	551	}
1da177e4 LT	552	}
1da177e4 LT	553
b4a1ed0c	554	#if IS_ENABLED(CONFIG_FB_BACKLIGHT)
5474c120 MH	555	/* This function generates a linear backlight curve
	556	*
	557	* 0: off
	558	* 1-7: min
	559	* 8-127: linear from min to max
	560	*/
	561	void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
	562	{
	563	unsigned int i, flat, count, range = (max - min);
	564
37ce69a5 RP	565	mutex_lock(&fb_info->bl_curve_mutex);
37ce69a5 RP	566
5474c120	567	fb_info->bl_curve[0] = off;
1da177e4	568
5474c120 MH	569	for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
	570	fb_info->bl_curve[flat] = min;
	571
	572	count = FB_BACKLIGHT_LEVELS * 15 / 16;
	573	for (i = 0; i < count; ++i)
	574	fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
37ce69a5 RP	575
37ce69a5 RP	576	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	577	}
	578	EXPORT_SYMBOL_GPL(fb_bl_default_curve);
	579	#endif