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