466 lines
12 KiB
C
466 lines
12 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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/**
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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 = kmalloc(fb_info_size + size, GFP_KERNEL);
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if (!p)
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return NULL;
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memset(p, 0, fb_info_size + size);
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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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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 class_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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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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return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d-%d\n", m, mode->xres, mode->yres, mode->refresh);
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}
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static ssize_t store_mode(struct class_device *class_device, const char * buf,
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size_t count)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, const char * buf,
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size_t count)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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((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 class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, const char * buf,
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size_t count)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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_virtual(struct class_device *class_device,
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const char * buf, size_t count)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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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/* Format for cmap is "%02x%c%4x%4x%4x\n" */
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/* %02x entry %c transp %4x red %4x blue %4x green \n */
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/* 256 rows at 16 chars equals 4096, the normal page size */
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/* the code will automatically adjust for different page sizes */
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static ssize_t store_cmap(struct class_device *class_device, const char *buf,
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size_t count)
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{
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struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
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int rc, i, start, length, transp = 0;
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if ((count > PAGE_SIZE) || ((count % 16) != 0))
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return -EINVAL;
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if (!fb_info->fbops->fb_setcolreg && !fb_info->fbops->fb_setcmap)
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return -EINVAL;
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sscanf(buf, "%02x", &start);
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length = count / 16;
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for (i = 0; i < length; i++)
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if (buf[i * 16 + 2] != ' ')
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transp = 1;
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/* If we can batch, do it */
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if (fb_info->fbops->fb_setcmap && length > 1) {
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struct fb_cmap umap;
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memset(&umap, 0, sizeof(umap));
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if ((rc = fb_alloc_cmap(&umap, length, transp)))
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return rc;
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umap.start = start;
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for (i = 0; i < length; i++) {
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sscanf(&buf[i * 16 + 3], "%4hx", &umap.red[i]);
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sscanf(&buf[i * 16 + 7], "%4hx", &umap.blue[i]);
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sscanf(&buf[i * 16 + 11], "%4hx", &umap.green[i]);
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if (transp)
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umap.transp[i] = (buf[i * 16 + 2] != ' ');
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}
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rc = fb_info->fbops->fb_setcmap(&umap, fb_info);
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fb_copy_cmap(&umap, &fb_info->cmap);
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fb_dealloc_cmap(&umap);
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return rc;
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}
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for (i = 0; i < length; i++) {
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u16 red, blue, green, tsp;
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sscanf(&buf[i * 16 + 3], "%4hx", &red);
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sscanf(&buf[i * 16 + 7], "%4hx", &blue);
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sscanf(&buf[i * 16 + 11], "%4hx", &green);
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tsp = (buf[i * 16 + 2] != ' ');
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if ((rc = fb_info->fbops->fb_setcolreg(start++,
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red, green, blue, tsp, fb_info)))
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return rc;
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fb_info->cmap.red[i] = red;
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fb_info->cmap.blue[i] = blue;
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fb_info->cmap.green[i] = green;
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if (transp)
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fb_info->cmap.transp[i] = tsp;
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}
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return 0;
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}
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static ssize_t show_cmap(struct class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_device);
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unsigned int i;
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if (!fb_info->cmap.red || !fb_info->cmap.blue ||
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!fb_info->cmap.green)
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return -EINVAL;
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if (fb_info->cmap.len > PAGE_SIZE / 16)
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return -EINVAL;
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/* don't mess with the format, the buffer is PAGE_SIZE */
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/* 256 entries at 16 chars per line equals 4096 = PAGE_SIZE */
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for (i = 0; i < fb_info->cmap.len; i++) {
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snprintf(&buf[ i * 16], PAGE_SIZE - i * 16, "%02x%c%4x%4x%4x\n", i + fb_info->cmap.start,
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((fb_info->cmap.transp && fb_info->cmap.transp[i]) ? '*' : ' '),
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fb_info->cmap.red[i], fb_info->cmap.blue[i],
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fb_info->cmap.green[i]);
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}
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return 16 * fb_info->cmap.len;
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}
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static ssize_t store_blank(struct class_device *class_device, const char * buf,
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size_t count)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
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{
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// struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
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return 0;
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}
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static ssize_t store_console(struct class_device *class_device,
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const char * buf, size_t count)
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{
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// struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
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return 0;
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}
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static ssize_t show_console(struct class_device *class_device, char *buf)
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{
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// struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
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return 0;
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}
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static ssize_t store_cursor(struct class_device *class_device,
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const char * buf, size_t count)
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{
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// struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
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return 0;
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}
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static ssize_t show_cursor(struct class_device *class_device, char *buf)
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{
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// struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
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return 0;
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}
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static ssize_t store_pan(struct class_device *class_device, const char * buf,
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size_t count)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_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 class_device *class_device, char *buf)
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{
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struct fb_info *fb_info =
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(struct fb_info *)class_get_devdata(class_device);
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return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
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fb_info->var.xoffset);
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}
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static ssize_t show_name(struct class_device *class_device, char *buf)
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{
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struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_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 struct class_device_attribute class_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(color_map, S_IRUGO|S_IWUSR, show_cmap, store_cmap),
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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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};
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int fb_init_class_device(struct fb_info *fb_info)
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{
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unsigned int i;
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class_set_devdata(fb_info->class_device, fb_info);
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for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
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class_device_create_file(fb_info->class_device,
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&class_device_attrs[i]);
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return 0;
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}
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void fb_cleanup_class_device(struct fb_info *fb_info)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
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class_device_remove_file(fb_info->class_device,
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&class_device_attrs[i]);
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}
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