/* * 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> #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 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_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) { 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 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; acquire_console_sem(); 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); release_console_sem(); 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; 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 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); 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 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); acquire_console_sem(); fb_set_suspend(fb_info, (int)state); release_console_sem(); 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