diff options
Diffstat (limited to 'drivers/video/fbdev/core/fbsysfs.c')
| -rw-r--r-- | drivers/video/fbdev/core/fbsysfs.c | 586 |
1 files changed, 586 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c new file mode 100644 index 000000000000..53444ac19fe0 --- /dev/null +++ b/drivers/video/fbdev/core/fbsysfs.c @@ -0,0 +1,586 @@ +/* + * fbsysfs.c - framebuffer device class and attributes + * + * Copyright (c) 2004 James Simmons <jsimmons@infradead.org> + * + * This program is free software you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +/* + * Note: currently there's only stubs for framebuffer_alloc and + * framebuffer_release here. The reson for that is that until all drivers + * are converted to use it a sysfsification will open OOPSable races. + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/fb.h> +#include <linux/console.h> +#include <linux/module.h> + +#define FB_SYSFS_FLAG_ATTR 1 + +/** + * framebuffer_alloc - creates a new frame buffer info structure + * + * @size: size of driver private data, can be zero + * @dev: pointer to the device for this fb, this can be NULL + * + * Creates a new frame buffer info structure. Also reserves @size bytes + * for driver private data (info->par). info->par (if any) will be + * aligned to sizeof(long). + * + * Returns the new structure, or NULL if an error occurred. + * + */ +struct fb_info *framebuffer_alloc(size_t size, struct device *dev) +{ +#define BYTES_PER_LONG (BITS_PER_LONG/8) +#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG)) + int fb_info_size = sizeof(struct fb_info); + struct fb_info *info; + char *p; + + if (size) + fb_info_size += PADDING; + + p = kzalloc(fb_info_size + size, GFP_KERNEL); + + if (!p) + return NULL; + + info = (struct fb_info *) p; + + if (size) + info->par = p + fb_info_size; + + info->device = dev; + +#ifdef CONFIG_FB_BACKLIGHT + mutex_init(&info->bl_curve_mutex); +#endif + + return info; +#undef PADDING +#undef BYTES_PER_LONG +} +EXPORT_SYMBOL(framebuffer_alloc); + +/** + * framebuffer_release - marks the structure available for freeing + * + * @info: frame buffer info structure + * + * Drop the reference count of the device embedded in the + * framebuffer info structure. + * + */ +void framebuffer_release(struct fb_info *info) +{ + if (!info) + return; + kfree(info->apertures); + kfree(info); +} +EXPORT_SYMBOL(framebuffer_release); + +static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var) +{ + int err; + + var->activate |= FB_ACTIVATE_FORCE; + console_lock(); + fb_info->flags |= FBINFO_MISC_USEREVENT; + err = fb_set_var(fb_info, var); + fb_info->flags &= ~FBINFO_MISC_USEREVENT; + console_unlock(); + if (err) + return err; + return 0; +} + +static int mode_string(char *buf, unsigned int offset, + const struct fb_videomode *mode) +{ + char m = 'U'; + char v = 'p'; + + if (mode->flag & FB_MODE_IS_DETAILED) + m = 'D'; + if (mode->flag & FB_MODE_IS_VESA) + m = 'V'; + if (mode->flag & FB_MODE_IS_STANDARD) + m = 'S'; + + if (mode->vmode & FB_VMODE_INTERLACED) + v = 'i'; + if (mode->vmode & FB_VMODE_DOUBLE) + v = 'd'; + + return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d%c-%d\n", + m, mode->xres, mode->yres, v, mode->refresh); +} + +static ssize_t store_mode(struct device *device, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + char mstr[100]; + struct fb_var_screeninfo var; + struct fb_modelist *modelist; + struct fb_videomode *mode; + struct list_head *pos; + size_t i; + int err; + + memset(&var, 0, sizeof(var)); + + list_for_each(pos, &fb_info->modelist) { + modelist = list_entry(pos, struct fb_modelist, list); + mode = &modelist->mode; + i = mode_string(mstr, 0, mode); + if (strncmp(mstr, buf, max(count, i)) == 0) { + + var = fb_info->var; + fb_videomode_to_var(&var, mode); + if ((err = activate(fb_info, &var))) + return err; + fb_info->mode = mode; + return count; + } + } + return -EINVAL; +} + +static ssize_t show_mode(struct device *device, struct device_attribute *attr, + char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + + if (!fb_info->mode) + return 0; + + return mode_string(buf, 0, fb_info->mode); +} + +static ssize_t store_modes(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + LIST_HEAD(old_list); + int i = count / sizeof(struct fb_videomode); + + if (i * sizeof(struct fb_videomode) != count) + return -EINVAL; + + console_lock(); + if (!lock_fb_info(fb_info)) { + console_unlock(); + return -ENODEV; + } + + 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); + + unlock_fb_info(fb_info); + console_unlock(); + + return 0; +} + +static ssize_t show_modes(struct device *device, struct device_attribute *attr, + char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + unsigned int i; + struct list_head *pos; + struct fb_modelist *modelist; + const struct fb_videomode *mode; + + i = 0; + list_for_each(pos, &fb_info->modelist) { + modelist = list_entry(pos, struct fb_modelist, list); + mode = &modelist->mode; + i += mode_string(buf, i, mode); + } + return i; +} + +static ssize_t store_bpp(struct device *device, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + struct fb_var_screeninfo var; + char ** last = NULL; + int err; + + var = fb_info->var; + var.bits_per_pixel = simple_strtoul(buf, last, 0); + if ((err = activate(fb_info, &var))) + return err; + return count; +} + +static ssize_t show_bpp(struct device *device, struct device_attribute *attr, + char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel); +} + +static ssize_t store_rotate(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + struct fb_var_screeninfo var; + char **last = NULL; + int err; + + var = fb_info->var; + var.rotate = simple_strtoul(buf, last, 0); + + if ((err = activate(fb_info, &var))) + return err; + + return count; +} + + +static ssize_t show_rotate(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + + return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate); +} + +static ssize_t store_virtual(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + struct fb_var_screeninfo var; + char *last = NULL; + int err; + + var = fb_info->var; + var.xres_virtual = simple_strtoul(buf, &last, 0); + last++; + if (last - buf >= count) + return -EINVAL; + var.yres_virtual = simple_strtoul(last, &last, 0); + + if ((err = activate(fb_info, &var))) + return err; + return count; +} + +static ssize_t show_virtual(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual, + fb_info->var.yres_virtual); +} + +static ssize_t show_stride(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length); +} + +static ssize_t store_blank(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + char *last = NULL; + int err; + + console_lock(); + fb_info->flags |= FBINFO_MISC_USEREVENT; + err = fb_blank(fb_info, simple_strtoul(buf, &last, 0)); + fb_info->flags &= ~FBINFO_MISC_USEREVENT; + console_unlock(); + if (err < 0) + return err; + return count; +} + +static ssize_t show_blank(struct device *device, + struct device_attribute *attr, char *buf) +{ +// struct fb_info *fb_info = dev_get_drvdata(device); + return 0; +} + +static ssize_t store_console(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ +// struct fb_info *fb_info = dev_get_drvdata(device); + return 0; +} + +static ssize_t show_console(struct device *device, + struct device_attribute *attr, char *buf) +{ +// struct fb_info *fb_info = dev_get_drvdata(device); + return 0; +} + +static ssize_t store_cursor(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ +// struct fb_info *fb_info = dev_get_drvdata(device); + return 0; +} + +static ssize_t show_cursor(struct device *device, + struct device_attribute *attr, char *buf) +{ +// struct fb_info *fb_info = dev_get_drvdata(device); + return 0; +} + +static ssize_t store_pan(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + struct fb_var_screeninfo var; + char *last = NULL; + int err; + + var = fb_info->var; + var.xoffset = simple_strtoul(buf, &last, 0); + last++; + if (last - buf >= count) + return -EINVAL; + var.yoffset = simple_strtoul(last, &last, 0); + + console_lock(); + err = fb_pan_display(fb_info, &var); + console_unlock(); + + if (err < 0) + return err; + return count; +} + +static ssize_t show_pan(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset, + fb_info->var.yoffset); +} + +static ssize_t show_name(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + + return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id); +} + +static ssize_t store_fbstate(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct fb_info *fb_info = dev_get_drvdata(device); + u32 state; + char *last = NULL; + + state = simple_strtoul(buf, &last, 0); + + console_lock(); + if (!lock_fb_info(fb_info)) { + console_unlock(); + return -ENODEV; + } + + fb_set_suspend(fb_info, (int)state); + + unlock_fb_info(fb_info); + console_unlock(); + + 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 |