[GitHub/mt8127/android_kernel_alcatel_ttab.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;

	if (!lock_fb_info(fb_info))
		return -ENODEV;
	console_lock();
	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);

	console_unlock();
	unlock_fb_info(fb_info);

	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);

	if (!lock_fb_info(fb_info))
		return -ENODEV;
	console_lock();
	fb_set_suspend(fb_info, (int)state);
	console_unlock();
	unlock_fb_info(fb_info);

	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
50e244cc AC	180	if (!lock_fb_info(fb_info))
50e244cc AC	181	return -ENODEV;
ac751efa	182	console_lock();
1da177e4	183	list_splice(&fb_info->modelist, &old_list);
9791d763	184	fb_videomode_to_modelist((const struct fb_videomode *)buf, i,
1da177e4 LT	185	&fb_info->modelist);
	186	if (fb_new_modelist(fb_info)) {
	187	fb_destroy_modelist(&fb_info->modelist);
	188	list_splice(&old_list, &fb_info->modelist);
	189	} else
	190	fb_destroy_modelist(&old_list);
	191
ac751efa	192	console_unlock();
50e244cc	193	unlock_fb_info(fb_info);
1da177e4 LT	194
	195	return 0;
	196	}
	197
78cde088 GKH	198	static ssize_t show_modes(struct device device, struct device_attribute attr,
78cde088 GKH	199	char *buf)
1da177e4	200	{
78cde088	201	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	202	unsigned int i;
	203	struct list_head *pos;
	204	struct fb_modelist *modelist;
	205	const struct fb_videomode *mode;
	206
	207	i = 0;
	208	list_for_each(pos, &fb_info->modelist) {
	209	modelist = list_entry(pos, struct fb_modelist, list);
	210	mode = &modelist->mode;
	211	i += mode_string(buf, i, mode);
	212	}
	213	return i;
	214	}
	215
78cde088 GKH	216	static ssize_t store_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	217	const char *buf, size_t count)
1da177e4	218	{
78cde088	219	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	220	struct fb_var_screeninfo var;
	221	char ** last = NULL;
	222	int err;
	223
	224	var = fb_info->var;
	225	var.bits_per_pixel = simple_strtoul(buf, last, 0);
	226	if ((err = activate(fb_info, &var)))
	227	return err;
	228	return count;
	229	}
	230
78cde088 GKH	231	static ssize_t show_bpp(struct device device, struct device_attribute attr,
78cde088 GKH	232	char *buf)
1da177e4	233	{
78cde088	234	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	235	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
	236	}
	237
78cde088 GKH	238	static ssize_t store_rotate(struct device *device,
	239	struct device_attribute *attr,
	240	const char *buf, size_t count)
a812c94b	241	{
78cde088	242	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	243	struct fb_var_screeninfo var;
	244	char **last = NULL;
	245	int err;
	246
	247	var = fb_info->var;
	248	var.rotate = simple_strtoul(buf, last, 0);
	249
	250	if ((err = activate(fb_info, &var)))
	251	return err;
	252
	253	return count;
	254	}
	255
	256
78cde088 GKH	257	static ssize_t show_rotate(struct device *device,
78cde088 GKH	258	struct device_attribute attr, char buf)
a812c94b	259	{
78cde088	260	struct fb_info *fb_info = dev_get_drvdata(device);
a812c94b AD	261
	262	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
	263	}
	264
78cde088 GKH	265	static ssize_t store_virtual(struct device *device,
	266	struct device_attribute *attr,
	267	const char *buf, size_t count)
1da177e4	268	{
78cde088	269	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	270	struct fb_var_screeninfo var;
	271	char *last = NULL;
	272	int err;
	273
	274	var = fb_info->var;
	275	var.xres_virtual = simple_strtoul(buf, &last, 0);
	276	last++;
	277	if (last - buf >= count)
	278	return -EINVAL;
	279	var.yres_virtual = simple_strtoul(last, &last, 0);
1da177e4 LT	280
	281	if ((err = activate(fb_info, &var)))
	282	return err;
	283	return count;
	284	}
	285
78cde088 GKH	286	static ssize_t show_virtual(struct device *device,
78cde088 GKH	287	struct device_attribute attr, char buf)
1da177e4	288	{
78cde088	289	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	290	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
e2c16499	291	fb_info->var.yres_virtual);
1da177e4 LT	292	}
1da177e4 LT	293
78cde088 GKH	294	static ssize_t show_stride(struct device *device,
78cde088 GKH	295	struct device_attribute attr, char buf)
c14e2cfc	296	{
78cde088	297	struct fb_info *fb_info = dev_get_drvdata(device);
c14e2cfc JS	298	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
	299	}
	300
78cde088 GKH	301	static ssize_t store_blank(struct device *device,
	302	struct device_attribute *attr,
	303	const char *buf, size_t count)
1da177e4	304	{
78cde088	305	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	306	char *last = NULL;
	307	int err;
	308
ac751efa	309	console_lock();
1da177e4 LT	310	fb_info->flags \|= FBINFO_MISC_USEREVENT;
	311	err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
	312	fb_info->flags &= ~FBINFO_MISC_USEREVENT;
ac751efa	313	console_unlock();
1da177e4 LT	314	if (err < 0)
	315	return err;
	316	return count;
	317	}
	318
78cde088 GKH	319	static ssize_t show_blank(struct device *device,
78cde088 GKH	320	struct device_attribute attr, char buf)
1da177e4	321	{
78cde088	322	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	323	return 0;
	324	}
	325
78cde088 GKH	326	static ssize_t store_console(struct device *device,
	327	struct device_attribute *attr,
	328	const char *buf, size_t count)
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 show_console(struct device *device,
78cde088 GKH	335	struct device_attribute attr, char buf)
1da177e4	336	{
78cde088	337	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	338	return 0;
	339	}
	340
78cde088 GKH	341	static ssize_t store_cursor(struct device *device,
	342	struct device_attribute *attr,
	343	const char *buf, size_t count)
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 show_cursor(struct device *device,
78cde088 GKH	350	struct device_attribute attr, char buf)
1da177e4	351	{
78cde088	352	// struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	353	return 0;
	354	}
	355
78cde088 GKH	356	static ssize_t store_pan(struct device *device,
	357	struct device_attribute *attr,
	358	const char *buf, size_t count)
1da177e4	359	{
78cde088	360	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4 LT	361	struct fb_var_screeninfo var;
	362	char *last = NULL;
	363	int err;
	364
	365	var = fb_info->var;
	366	var.xoffset = simple_strtoul(buf, &last, 0);
	367	last++;
	368	if (last - buf >= count)
	369	return -EINVAL;
	370	var.yoffset = simple_strtoul(last, &last, 0);
	371
ac751efa	372	console_lock();
1da177e4	373	err = fb_pan_display(fb_info, &var);
ac751efa	374	console_unlock();
1da177e4 LT	375
	376	if (err < 0)
	377	return err;
	378	return count;
	379	}
	380
78cde088 GKH	381	static ssize_t show_pan(struct device *device,
78cde088 GKH	382	struct device_attribute attr, char buf)
1da177e4	383	{
78cde088	384	struct fb_info *fb_info = dev_get_drvdata(device);
1da177e4	385	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
c4270637	386	fb_info->var.yoffset);
1da177e4 LT	387	}
1da177e4 LT	388
78cde088 GKH	389	static ssize_t show_name(struct device *device,
78cde088 GKH	390	struct device_attribute attr, char buf)
02459eaa	391	{
78cde088	392	struct fb_info *fb_info = dev_get_drvdata(device);
02459eaa JS	393
	394	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
	395	}
	396
78cde088 GKH	397	static ssize_t store_fbstate(struct device *device,
	398	struct device_attribute *attr,
	399	const char *buf, size_t count)
30420f8f	400	{
78cde088	401	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	402	u32 state;
	403	char *last = NULL;
	404
	405	state = simple_strtoul(buf, &last, 0);
	406
9e769ff3 HRK	407	if (!lock_fb_info(fb_info))
9e769ff3 HRK	408	return -ENODEV;
ac751efa	409	console_lock();
30420f8f	410	fb_set_suspend(fb_info, (int)state);
ac751efa	411	console_unlock();
9e769ff3	412	unlock_fb_info(fb_info);
30420f8f MG	413
	414	return count;
	415	}
	416
78cde088 GKH	417	static ssize_t show_fbstate(struct device *device,
78cde088 GKH	418	struct device_attribute attr, char buf)
30420f8f	419	{
78cde088	420	struct fb_info *fb_info = dev_get_drvdata(device);
30420f8f MG	421	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
	422	}
	423
5474c120	424	#ifdef CONFIG_FB_BACKLIGHT
78cde088 GKH	425	static ssize_t store_bl_curve(struct device *device,
	426	struct device_attribute *attr,
	427	const char *buf, size_t count)
5474c120	428	{
78cde088	429	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	430	u8 tmp_curve[FB_BACKLIGHT_LEVELS];
	431	unsigned int i;
	432
25981de5 MH	433	/* Some drivers don't use framebuffer_alloc(), but those also
	434	* don't have backlights.
	435	*/
	436	if (!fb_info \|\| !fb_info->bl_dev)
	437	return -ENODEV;
	438
5474c120 MH	439	if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
	440	return -EINVAL;
	441
	442	for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
	443	if (sscanf(&buf[i * 24],
	444	"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
	445	&tmp_curve[i * 8 + 0],
	446	&tmp_curve[i * 8 + 1],
	447	&tmp_curve[i * 8 + 2],
	448	&tmp_curve[i * 8 + 3],
	449	&tmp_curve[i * 8 + 4],
	450	&tmp_curve[i * 8 + 5],
	451	&tmp_curve[i * 8 + 6],
	452	&tmp_curve[i * 8 + 7]) != 8)
	453	return -EINVAL;
	454
	455	/* If there has been an error in the input data, we won't
	456	* reach this loop.
	457	*/
37ce69a5	458	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	459	for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
5474c120 MH	460	fb_info->bl_curve[i] = tmp_curve[i];
37ce69a5	461	mutex_unlock(&fb_info->bl_curve_mutex);
5474c120 MH	462
	463	return count;
	464	}
	465
78cde088 GKH	466	static ssize_t show_bl_curve(struct device *device,
78cde088 GKH	467	struct device_attribute attr, char buf)
5474c120	468	{
78cde088	469	struct fb_info *fb_info = dev_get_drvdata(device);
5474c120 MH	470	ssize_t len = 0;
	471	unsigned int i;
	472
25981de5 MH	473	/* Some drivers don't use framebuffer_alloc(), but those also
	474	* don't have backlights.
	475	*/
	476	if (!fb_info \|\| !fb_info->bl_dev)
	477	return -ENODEV;
	478
37ce69a5	479	mutex_lock(&fb_info->bl_curve_mutex);
5474c120 MH	480	for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
	481	len += snprintf(&buf[len], PAGE_SIZE,
	482	"%02x %02x %02x %02x %02x %02x %02x %02x\n",
	483	fb_info->bl_curve[i + 0],
	484	fb_info->bl_curve[i + 1],
	485	fb_info->bl_curve[i + 2],
	486	fb_info->bl_curve[i + 3],
	487	fb_info->bl_curve[i + 4],
	488	fb_info->bl_curve[i + 5],
	489	fb_info->bl_curve[i + 6],
	490	fb_info->bl_curve[i + 7]);
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),
5474c120 MH	513	#ifdef CONFIG_FB_BACKLIGHT
	514	__ATTR(bl_curve, S_IRUGO\|S_IWUSR, show_bl_curve, store_bl_curve),
	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
5474c120 MH	554	#ifdef CONFIG_FB_BACKLIGHT
	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