/*
   *    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/string.h>
  #include <linux/uaccess.h>
  #include <linux/cfag12864b.h>
  
  #define CFAG12864BFB_NAME "cfag12864bfb"

  static struct fb_fix_screeninfo cfag12864bfb_fix __devinitdata = {

  	.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 __devinitdata = {

  	.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 __devinit 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
  ", info->node,
  		info->fix.id);
  
  	return 0;
  
  fballoced:
  	framebuffer_release(info);
  
  none:
  	return ret;
  }

  static int __devexit 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 = __devexit_p(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
  ");
  		goto none;
  	}

  
  	if (cfag12864b_enable()) {
  		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
  			"can't enable cfag12864b refreshing (being used)
  ");
  		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");