/*
 *    Filename: cfag12864bfb.c
 *     Version: 0.1.0
 * Description: cfag12864b LCD framebuffer driver
 *     License: GPLv2
 *     Depends: cfag12864b
 *
 *      Author: Copyright (C) Miguel Ojeda Sandonis
 *        Date: 2006-10-31
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/cfag12864b.h>

#define CFAG12864BFB_NAME "cfag12864bfb"

static struct fb_fix_screeninfo cfag12864bfb_fix __initdata = {
        .id = "cfag12864b",
        .type = FB_TYPE_PACKED_PIXELS,
        .visual = FB_VISUAL_MONO10,
        .xpanstep = 0,
        .ypanstep = 0,
        .ywrapstep = 0,
        .line_length = CFAG12864B_WIDTH / 8,
        .accel = FB_ACCEL_NONE,
};

static struct fb_var_screeninfo cfag12864bfb_var __initdata = {
        .xres = CFAG12864B_WIDTH,
        .yres = CFAG12864B_HEIGHT,
        .xres_virtual = CFAG12864B_WIDTH,
        .yres_virtual = CFAG12864B_HEIGHT,
        .bits_per_pixel = 1,
        .red = { 0, 1, 0 },
        .green = { 0, 1, 0 },
        .blue = { 0, 1, 0 },
        .left_margin = 0,
        .right_margin = 0,
        .upper_margin = 0,
        .lower_margin = 0,
        .vmode = FB_VMODE_NONINTERLACED,
};

static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
        return vm_insert_page(vma, vma->vm_start,
                virt_to_page(cfag12864b_buffer));
}

static struct fb_ops cfag12864bfb_ops = {
        .owner = THIS_MODULE,
        .fb_read = fb_sys_read,
        .fb_write = fb_sys_write,
        .fb_fillrect = sys_fillrect,
        .fb_copyarea = sys_copyarea,
        .fb_imageblit = sys_imageblit,
        .fb_mmap = cfag12864bfb_mmap,
};

static int __init cfag12864bfb_probe(struct platform_device *device)
{
        int ret = -EINVAL;
        struct fb_info *info = framebuffer_alloc(0, &device->dev);

        if (!info)
                goto none;

        info->screen_base = (char __iomem *) cfag12864b_buffer;
        info->screen_size = CFAG12864B_SIZE;
        info->fbops = &cfag12864bfb_ops;
        info->fix = cfag12864bfb_fix;
        info->var = cfag12864bfb_var;
        info->pseudo_palette = NULL;
        info->par = NULL;
        info->flags = FBINFO_FLAG_DEFAULT;

        if (register_framebuffer(info) < 0)
                goto fballoced;

        platform_set_drvdata(device, info);

        printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
                info->fix.id);

        return 0;

fballoced:
        framebuffer_release(info);

none:
        return ret;
}

static int cfag12864bfb_remove(struct platform_device *device)
{
        struct fb_info *info = platform_get_drvdata(device);

        if (info) {
                unregister_framebuffer(info);
                framebuffer_release(info);
        }

        return 0;
}

static struct platform_driver cfag12864bfb_driver = {
        .probe  = cfag12864bfb_probe,
        .remove = cfag12864bfb_remove,
        .driver = {
                .name   = CFAG12864BFB_NAME,
        },
};

static struct platform_device *cfag12864bfb_device;

static int __init cfag12864bfb_init(void)
{
        int ret = -EINVAL;

        /* cfag12864b_init() must be called first */
        if (!cfag12864b_isinited()) {
                printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
                        "cfag12864b is not initialized\n");
                goto none;
        }

        if (cfag12864b_enable()) {
                printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
                        "can't enable cfag12864b refreshing (being used)\n");
                return -ENODEV;
        }

        ret = platform_driver_register(&cfag12864bfb_driver);

        if (!ret) {
                cfag12864bfb_device =
                        platform_device_alloc(CFAG12864BFB_NAME, 0);

                if (cfag12864bfb_device)
                        ret = platform_device_add(cfag12864bfb_device);
                else
                        ret = -ENOMEM;

                if (ret) {
                        platform_device_put(cfag12864bfb_device);
                        platform_driver_unregister(&cfag12864bfb_driver);
                }
        }

none:
        return ret;
}

static void __exit cfag12864bfb_exit(void)
{
        platform_device_unregister(cfag12864bfb_device);
        platform_driver_unregister(&cfag12864bfb_driver);
        cfag12864b_disable();
}

module_init(cfag12864bfb_init);
module_exit(cfag12864bfb_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");