1 files changed, 389 insertions, 0 deletions

diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
new file mode 100644
index 000000000000..2bdda4010b81
--- /dev/null
+++ b/drivers/video/fbsysfs.c
@@ -0,0 +1,389 @@
+/*
+ * 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>
+
+/**
+ * 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 = kmalloc(fb_info_size + size, GFP_KERNEL);
+        if (!p)
+                return NULL;
+        memset(p, 0, fb_info_size + size);
+        info = (struct fb_info *) p;
+
+        if (size)
+                info->par = p + fb_info_size;
+
+        info->device = dev;
+
+        return info;
+#undef PADDING
+#undef BYTES_PER_LONG
+}
+EXPORT_SYMBOL(framebuffer_alloc);
+
+/**
+ * framebuffer_release - marks the structure available for freeing
+ *
+ * @info: frame buffer info structure
+ *
+ * Drop the reference count of the class_device embedded in the
+ * framebuffer info structure.
+ *
+ */
+void framebuffer_release(struct fb_info *info)
+{
+        kfree(info);
+}
+EXPORT_SYMBOL(framebuffer_release);
+
+static int activate(struct fb_info *fb_info, struct fb_var_screeninfo *var)
+{
+        int err;
+
+        var->activate |= FB_ACTIVATE_FORCE;
+        acquire_console_sem();
+        fb_info->flags |= FBINFO_MISC_USEREVENT;
+        err = fb_set_var(fb_info, var);
+        fb_info->flags &= ~FBINFO_MISC_USEREVENT;
+        release_console_sem();
+        if (err)
+                return err;
+        return 0;
+}
+
+static int mode_string(char *buf, unsigned int offset,
+                       const struct fb_videomode *mode)
+{
+        char m = 'U';
+        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';
+        return snprintf(&buf[offset], PAGE_SIZE - offset, "%c:%dx%d-%d\n", m, mode->xres, mode->yres, mode->refresh);
+}
+
+static ssize_t store_mode(struct class_device *class_device, const char * buf,
+                          size_t count)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        char mstr[100];
+        struct fb_var_screeninfo var;
+        struct fb_modelist *modelist;
+        struct fb_videomode *mode;
+        struct list_head *pos;
+        size_t i;
+        int err;
+
+        memset(&var, 0, sizeof(var));
+
+        list_for_each(pos, &fb_info->modelist) {
+                modelist = list_entry(pos, struct fb_modelist, list);
+                mode = &modelist->mode;
+                i = mode_string(mstr, 0, mode);
+                if (strncmp(mstr, buf, max(count, i)) == 0) {
+
+                        var = fb_info->var;
+                        fb_videomode_to_var(&var, mode);
+                        if ((err = activate(fb_info, &var)))
+                                return err;
+                        fb_info->mode = mode;
+                        return count;
+                }
+        }
+        return -EINVAL;
+}
+
+static ssize_t show_mode(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+
+        if (!fb_info->mode)
+                return 0;
+
+        return mode_string(buf, 0, fb_info->mode);
+}
+
+static ssize_t store_modes(struct class_device *class_device, const char * buf,
+                           size_t count)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        LIST_HEAD(old_list);
+        int i = count / sizeof(struct fb_videomode);
+
+        if (i * sizeof(struct fb_videomode) != count)
+                return -EINVAL;
+
+        acquire_console_sem();
+        list_splice(&fb_info->modelist, &old_list);
+        fb_videomode_to_modelist((struct fb_videomode *)buf, i,
+                                 &fb_info->modelist);
+        if (fb_new_modelist(fb_info)) {
+                fb_destroy_modelist(&fb_info->modelist);
+                list_splice(&old_list, &fb_info->modelist);
+        } else
+                fb_destroy_modelist(&old_list);
+
+        release_console_sem();
+
+        return 0;
+}
+
+static ssize_t show_modes(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        unsigned int i;
+        struct list_head *pos;
+        struct fb_modelist *modelist;
+        const struct fb_videomode *mode;
+
+        i = 0;
+        list_for_each(pos, &fb_info->modelist) {
+                modelist = list_entry(pos, struct fb_modelist, list);
+                mode = &modelist->mode;
+                i += mode_string(buf, i, mode);
+        }
+        return i;
+}
+
+static ssize_t store_bpp(struct class_device *class_device, const char * buf,
+                         size_t count)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        struct fb_var_screeninfo var;
+        char ** last = NULL;
+        int err;
+
+        var = fb_info->var;
+        var.bits_per_pixel = simple_strtoul(buf, last, 0);
+        if ((err = activate(fb_info, &var)))
+                return err;
+        return count;
+}
+
+static ssize_t show_bpp(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
+}
+
+static ssize_t store_virtual(struct class_device *class_device,
+                             const char * buf, size_t count)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        struct fb_var_screeninfo var;
+        char *last = NULL;
+        int err;
+
+        var = fb_info->var;
+        var.xres_virtual = simple_strtoul(buf, &last, 0);
+        last++;
+        if (last - buf >= count)
+                return -EINVAL;
+        var.yres_virtual = simple_strtoul(last, &last, 0);
+        printk(KERN_ERR "fb: xres %d yres %d\n", var.xres_virtual,
+               var.yres_virtual);
+
+        if ((err = activate(fb_info, &var)))
+                return err;
+        return count;
+}
+
+static ssize_t show_virtual(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
+                        fb_info->var.xres_virtual);
+}
+
+static ssize_t store_cmap(struct class_device *class_device, const char * buf,
+                          size_t count)
+{
+//      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
+        return 0;
+}
+
+static ssize_t show_cmap(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        unsigned int offset = 0, i;
+
+        if (!fb_info->cmap.red || !fb_info->cmap.blue ||
+            fb_info->cmap.green || fb_info->cmap.transp)
+                return -EINVAL;
+
+        for (i = 0; i < fb_info->cmap.len; i++) {
+                offset += snprintf(buf, PAGE_SIZE - offset,
+                                   "%d,%d,%d,%d,%d\n", i + fb_info->cmap.start,
+                                   fb_info->cmap.red[i], fb_info->cmap.blue[i],
+                                   fb_info->cmap.green[i],
+                                   fb_info->cmap.transp[i]);
+        }
+        return offset;
+}
+
+static ssize_t store_blank(struct class_device *class_device, const char * buf,
+                           size_t count)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        char *last = NULL;
+        int err;
+
+        acquire_console_sem();
+        fb_info->flags |= FBINFO_MISC_USEREVENT;
+        err = fb_blank(fb_info, simple_strtoul(buf, &last, 0));
+        fb_info->flags &= ~FBINFO_MISC_USEREVENT;
+        release_console_sem();
+        if (err < 0)
+                return err;
+        return count;
+}
+
+static ssize_t show_blank(struct class_device *class_device, char *buf)
+{
+//      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
+        return 0;
+}
+
+static ssize_t store_console(struct class_device *class_device,
+                             const char * buf, size_t count)
+{
+//      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
+        return 0;
+}
+
+static ssize_t show_console(struct class_device *class_device, char *buf)
+{
+//      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
+        return 0;
+}
+
+static ssize_t store_cursor(struct class_device *class_device,
+                            const char * buf, size_t count)
+{
+//      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
+        return 0;
+}
+
+static ssize_t show_cursor(struct class_device *class_device, char *buf)
+{
+//      struct fb_info *fb_info = (struct fb_info *)class_get_devdata(class_device);
+        return 0;
+}
+
+static ssize_t store_pan(struct class_device *class_device, const char * buf,
+                         size_t count)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        struct fb_var_screeninfo var;
+        char *last = NULL;
+        int err;
+
+        var = fb_info->var;
+        var.xoffset = simple_strtoul(buf, &last, 0);
+        last++;
+        if (last - buf >= count)
+                return -EINVAL;
+        var.yoffset = simple_strtoul(last, &last, 0);
+
+        acquire_console_sem();
+        err = fb_pan_display(fb_info, &var);
+        release_console_sem();
+
+        if (err < 0)
+                return err;
+        return count;
+}
+
+static ssize_t show_pan(struct class_device *class_device, char *buf)
+{
+        struct fb_info *fb_info =
+                (struct fb_info *)class_get_devdata(class_device);
+        return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
+                        fb_info->var.xoffset);
+}
+
+struct class_device_attribute class_device_attrs[] = {
+        __ATTR(bits_per_pixel, S_IRUGO|S_IWUSR, show_bpp, store_bpp),
+        __ATTR(blank, S_IRUGO|S_IWUSR, show_blank, store_blank),
+        __ATTR(color_map, S_IRUGO|S_IWUSR, show_cmap, store_cmap),
+        __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),
+};
+
+int fb_init_class_device(struct fb_info *fb_info)
+{
+        unsigned int i;
+        class_set_devdata(fb_info->class_device, fb_info);
+
+        for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
+                class_device_create_file(fb_info->class_device,
+                                         &class_device_attrs[i]);
+        return 0;
+}
+
+void fb_cleanup_class_device(struct fb_info *fb_info)
+{
+        unsigned int i;
+
+        for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
+                class_device_remove_file(fb_info->class_device,
+                                         &class_device_attrs[i]);
+}
+
+