linux/drivers/video/fbsysfs.c
Antonino A. Daplas 9a17917671 [PATCH] Detaching fbcon: sdd sysfs class device entry for fbcon
In order for this feature to work, an interface will be needed.  The most
appropriate is sysfs.  However, the framebuffer console has no sysfs entry
yet.  This will create a sysfs class device entry for fbcon under
/sys/class/graphics.

Add a class_device entry 'fbcon' under class 'graphics'.  Console-specific
attributes which where previously under class/graphics/fb[x] are moved to
class/graphics/fbcon.  These attributes, 'con_rotate' and 'con_rotate_all',
are also renamed to 'rotate' and 'rotate_all' respectively.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 09:58:32 -07:00

514 lines
13 KiB
C

/*
* fbsysfs.c - framebuffer device class and attributes
*
* Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
*
* This program is free software you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
/*
* Note: currently there's only stubs for framebuffer_alloc and
* framebuffer_release here. The reson for that is that until all drivers
* are converted to use it a sysfsification will open OOPSable races.
*/
#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/module.h>
/**
* framebuffer_alloc - creates a new frame buffer info structure
*
* @size: size of driver private data, can be zero
* @dev: pointer to the device for this fb, this can be NULL
*
* Creates a new frame buffer info structure. Also reserves @size bytes
* for driver private data (info->par). info->par (if any) will be
* aligned to sizeof(long).
*
* Returns the new structure, or NULL if an error occured.
*
*/
struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
{
#define BYTES_PER_LONG (BITS_PER_LONG/8)
#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
int fb_info_size = sizeof(struct fb_info);
struct fb_info *info;
char *p;
if (size)
fb_info_size += PADDING;
p = kzalloc(fb_info_size + size, GFP_KERNEL);
if (!p)
return NULL;
info = (struct fb_info *) p;
if (size)
info->par = p + fb_info_size;
info->device = dev;
#ifdef CONFIG_FB_BACKLIGHT
mutex_init(&info->bl_mutex);
#endif
return info;
#undef PADDING
#undef BYTES_PER_LONG
}
EXPORT_SYMBOL(framebuffer_alloc);
/**
* framebuffer_release - marks the structure available for freeing
*
* @info: frame buffer info structure
*
* Drop the reference count of the class_device embedded in the
* framebuffer info structure.
*
*/
void framebuffer_release(struct fb_info *info)
{
kfree(info);
}
EXPORT_SYMBOL(framebuffer_release);
static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
{
int err;
var->activate |= FB_ACTIVATE_FORCE;
acquire_console_sem();
fb_info->flags |= FBINFO_MISC_USEREVENT;
err = fb_set_var(fb_info, var);
fb_info->flags &= ~FBINFO_MISC_USEREVENT;
release_console_sem();
if (err)
return err;
return 0;
}
static int mode_string(char *buf, unsigned int offset,
const struct fb_videomode *mode)
{
char m = 'U';
char v = 'p';
if (mode->flag & FB_MODE_IS_DETAILED)
m = 'D';
if (mode->flag & FB_MODE_IS_VESA)
m = 'V';
if (mode->flag & FB_MODE_IS_STANDARD)
m = 'S';
if (mode->vmode & FB_VMODE_INTERLACED)
v = 'i';
if (mode->vmode & FB_VMODE_DOUBLE)
v = 'd';
return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n",
m, mode->xres, mode->yres, v, mode->refresh);
}
static ssize_t store_mode(struct class_device *class_device, const char * buf,
size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
char mstr[100];
struct fb_var_screeninfo var;
struct fb_modelist *modelist;
struct fb_videomode *mode;
struct list_head *pos;
size_t i;
int err;
memset(&var, 0, sizeof(var));
list_for_each(pos, &fb_info->modelist) {
modelist = list_entry(pos, struct fb_modelist, list);
mode = &modelist->mode;
i = mode_string(mstr, 0, mode);
if (strncmp(mstr, buf, max(count, i)) == 0) {
var = fb_info->var;
fb_videomode_to_var(&var, mode);
if ((err = activate(fb_info, &var)))
return err;
fb_info->mode = mode;
return count;
}
}
return -EINVAL;
}
static ssize_t show_mode(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
if (!fb_info->mode)
return 0;
return mode_string(buf, 0, fb_info->mode);
}
static ssize_t store_modes(struct class_device *class_device, const char * buf,
size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
LIST_HEAD(old_list);
int i = count / sizeof(struct fb_videomode);
if (i * sizeof(struct fb_videomode) != count)
return -EINVAL;
acquire_console_sem();
list_splice(&fb_info->modelist, &old_list);
fb_videomode_to_modelist((struct fb_videomode *)buf, i,
&fb_info->modelist);
if (fb_new_modelist(fb_info)) {
fb_destroy_modelist(&fb_info->modelist);
list_splice(&old_list, &fb_info->modelist);
} else
fb_destroy_modelist(&old_list);
release_console_sem();
return 0;
}
static ssize_t show_modes(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
unsigned int i;
struct list_head *pos;
struct fb_modelist *modelist;
const struct fb_videomode *mode;
i = 0;
list_for_each(pos, &fb_info->modelist) {
modelist = list_entry(pos, struct fb_modelist, list);
mode = &modelist->mode;
i += mode_string(buf, i, mode);
}
return i;
}
static ssize_t store_bpp(struct class_device *class_device, const char * buf,
size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
struct fb_var_screeninfo var;
char ** last = NULL;
int err;
var = fb_info->var;
var.bits_per_pixel = simple_strtoul(buf, last, 0);
if ((err = activate(fb_info, &var)))
return err;
return count;
}
static ssize_t show_bpp(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
}
static ssize_t store_rotate(struct class_device *class_device, const char *buf,
size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
struct fb_var_screeninfo var;
char **last = NULL;
int err;
var = fb_info->var;
var.rotate = simple_strtoul(buf, last, 0);
if ((err = activate(fb_info, &var)))
return err;
return count;
}
static ssize_t show_rotate(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
}
static ssize_t store_virtual(struct class_device *class_device,
const char * buf, size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
struct fb_var_screeninfo var;
char *last = NULL;
int err;
var = fb_info->var;
var.xres_virtual = simple_strtoul(buf, &last, 0);
last++;
if (last - buf >= count)
return -EINVAL;
var.yres_virtual = simple_strtoul(last, &last, 0);
if ((err = activate(fb_info, &var)))
return err;
return count;
}
static ssize_t show_virtual(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
fb_info->var.yres_virtual);
}
static ssize_t show_stride(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
}
static ssize_t store_blank(struct class_device *class_device, const char * buf,
size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
char *last = NULL;
int err;
acquire_console_sem();
fb_info->flags |= FBINFO_MISC_USEREVENT;
err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
fb_info->flags &= ~FBINFO_MISC_USEREVENT;
release_console_sem();
if (err < 0)
return err;
return count;
}
static ssize_t show_blank(struct class_device *class_device, char *buf)
{
// struct fb_info *fb_info = class_get_devdata(class_device);
return 0;
}
static ssize_t store_console(struct class_device *class_device,
const char * buf, size_t count)
{
// struct fb_info *fb_info = class_get_devdata(class_device);
return 0;
}
static ssize_t show_console(struct class_device *class_device, char *buf)
{
// struct fb_info *fb_info = class_get_devdata(class_device);
return 0;
}
static ssize_t store_cursor(struct class_device *class_device,
const char * buf, size_t count)
{
// struct fb_info *fb_info = class_get_devdata(class_device);
return 0;
}
static ssize_t show_cursor(struct class_device *class_device, char *buf)
{
// struct fb_info *fb_info = class_get_devdata(class_device);
return 0;
}
static ssize_t store_pan(struct class_device *class_device, const char * buf,
size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
struct fb_var_screeninfo var;
char *last = NULL;
int err;
var = fb_info->var;
var.xoffset = simple_strtoul(buf, &last, 0);
last++;
if (last - buf >= count)
return -EINVAL;
var.yoffset = simple_strtoul(last, &last, 0);
acquire_console_sem();
err = fb_pan_display(fb_info, &var);
release_console_sem();
if (err < 0)
return err;
return count;
}
static ssize_t show_pan(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
fb_info->var.xoffset);
}
static ssize_t show_name(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
}
static ssize_t store_fbstate(struct class_device *class_device,
const char *buf, size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
u32 state;
char *last = NULL;
state = simple_strtoul(buf, &last, 0);
acquire_console_sem();
fb_set_suspend(fb_info, (int)state);
release_console_sem();
return count;
}
static ssize_t show_fbstate(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
}
#ifdef CONFIG_FB_BACKLIGHT
static ssize_t store_bl_curve(struct class_device *class_device,
const char *buf, size_t count)
{
struct fb_info *fb_info = class_get_devdata(class_device);
u8 tmp_curve[FB_BACKLIGHT_LEVELS];
unsigned int i;
if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
return -EINVAL;
for (i = 0; i < (FB_BACKLIGHT_LEVELS / 8); ++i)
if (sscanf(&buf[i * 24],
"%2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx %2hhx\n",
&tmp_curve[i * 8 + 0],
&tmp_curve[i * 8 + 1],
&tmp_curve[i * 8 + 2],
&tmp_curve[i * 8 + 3],
&tmp_curve[i * 8 + 4],
&tmp_curve[i * 8 + 5],
&tmp_curve[i * 8 + 6],
&tmp_curve[i * 8 + 7]) != 8)
return -EINVAL;
/* If there has been an error in the input data, we won't
* reach this loop.
*/
mutex_lock(&fb_info->bl_mutex);
for (i = 0; i < FB_BACKLIGHT_LEVELS; ++i)
fb_info->bl_curve[i] = tmp_curve[i];
mutex_unlock(&fb_info->bl_mutex);
return count;
}
static ssize_t show_bl_curve(struct class_device *class_device, char *buf)
{
struct fb_info *fb_info = class_get_devdata(class_device);
ssize_t len = 0;
unsigned int i;
mutex_lock(&fb_info->bl_mutex);
for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
len += snprintf(&buf[len], PAGE_SIZE,
"%02x %02x %02x %02x %02x %02x %02x %02x\n",
fb_info->bl_curve[i + 0],
fb_info->bl_curve[i + 1],
fb_info->bl_curve[i + 2],
fb_info->bl_curve[i + 3],
fb_info->bl_curve[i + 4],
fb_info->bl_curve[i + 5],
fb_info->bl_curve[i + 6],
fb_info->bl_curve[i + 7]);
mutex_unlock(&fb_info->bl_mutex);
return len;
}
#endif
/* When cmap is added back in it should be a binary attribute
* not a text one. Consideration should also be given to converting
* fbdev to use configfs instead of sysfs */
static struct class_device_attribute class_device_attrs[] = {
__ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
__ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
__ATTR(console, S_IRUGO|S_IWUSR, show_console, store_console),
__ATTR(cursor, S_IRUGO|S_IWUSR, show_cursor, store_cursor),
__ATTR(mode, S_IRUGO|S_IWUSR, show_mode, store_mode),
__ATTR(modes, S_IRUGO|S_IWUSR, show_modes, store_modes),
__ATTR(pan, S_IRUGO|S_IWUSR, show_pan, store_pan),
__ATTR(virtual_size, S_IRUGO|S_IWUSR, show_virtual, store_virtual),
__ATTR(name, S_IRUGO, show_name, NULL),
__ATTR(stride, S_IRUGO, show_stride, NULL),
__ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate),
__ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate),
#ifdef CONFIG_FB_BACKLIGHT
__ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve),
#endif
};
int fb_init_class_device(struct fb_info *fb_info)
{
unsigned int i;
class_set_devdata(fb_info->class_device, fb_info);
for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
class_device_create_file(fb_info->class_device,
&class_device_attrs[i]);
return 0;
}
void fb_cleanup_class_device(struct fb_info *fb_info)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
class_device_remove_file(fb_info->class_device,
&class_device_attrs[i]);
}
#ifdef CONFIG_FB_BACKLIGHT
/* This function generates a linear backlight curve
*
* 0: off
* 1-7: min
* 8-127: linear from min to max
*/
void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max)
{
unsigned int i, flat, count, range = (max - min);
fb_info->bl_curve[0] = off;
for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
fb_info->bl_curve[flat] = min;
count = FB_BACKLIGHT_LEVELS * 15 / 16;
for (i = 0; i < count; ++i)
fb_info->bl_curve[flat + i] = min + (range * (i + 1) / count);
}
EXPORT_SYMBOL_GPL(fb_bl_default_curve);
#endif