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/*

 * 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