drivers/auxdisplay/cfag12864bfb.c

   1 /*
   2  *    Filename: cfag12864bfb.c
   3  *     Version: 0.1.0
   4  * Description: cfag12864b LCD framebuffer driver
   5  *     License: GPLv2
   6  *     Depends: cfag12864b
   7  *
   8  *      Author: Copyright (C) Miguel Ojeda Sandonis
   9  *        Date: 2006-10-31
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2 as
  13  *  published by the Free Software Foundation.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  *
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/fb.h>
  32 #include <linux/mm.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/string.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/cfag12864b.h>
  37
  38 #define CFAG12864BFB_NAME "cfag12864bfb"
  39
  40 static struct fb_fix_screeninfo cfag12864bfb_fix = {
  41         .id = "cfag12864b",
  42         .type = FB_TYPE_PACKED_PIXELS,
  43         .visual = FB_VISUAL_MONO10,
  44         .xpanstep = 0,
  45         .ypanstep = 0,
  46         .ywrapstep = 0,
  47         .line_length = CFAG12864B_WIDTH / 8,
  48         .accel = FB_ACCEL_NONE,
  49 };
  50
  51 static struct fb_var_screeninfo cfag12864bfb_var = {
  52         .xres = CFAG12864B_WIDTH,
  53         .yres = CFAG12864B_HEIGHT,
  54         .xres_virtual = CFAG12864B_WIDTH,
  55         .yres_virtual = CFAG12864B_HEIGHT,
  56         .bits_per_pixel = 1,
  57         .red = { 0, 1, 0 },
  58         .green = { 0, 1, 0 },
  59         .blue = { 0, 1, 0 },
  60         .left_margin = 0,
  61         .right_margin = 0,
  62         .upper_margin = 0,
  63         .lower_margin = 0,
  64         .vmode = FB_VMODE_NONINTERLACED,
  65 };
  66
  67 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
  68 {
  69         return vm_insert_page(vma, vma->vm_start,
  70                 virt_to_page(cfag12864b_buffer));
  71 }
  72
  73 static struct fb_ops cfag12864bfb_ops = {
  74         .owner = THIS_MODULE,
  75         .fb_read = fb_sys_read,
  76         .fb_write = fb_sys_write,
  77         .fb_fillrect = sys_fillrect,
  78         .fb_copyarea = sys_copyarea,
  79         .fb_imageblit = sys_imageblit,
  80         .fb_mmap = cfag12864bfb_mmap,
  81 };
  82
  83 static int cfag12864bfb_probe(struct platform_device *device)
  84 {
  85         int ret = -EINVAL;
  86         struct fb_info *info = framebuffer_alloc(0, &device->dev);
  87
  88         if (!info)
  89                 goto none;
  90
  91         info->screen_base = (char __iomem *) cfag12864b_buffer;
  92         info->screen_size = CFAG12864B_SIZE;
  93         info->fbops = &cfag12864bfb_ops;
  94         info->fix = cfag12864bfb_fix;
  95         info->var = cfag12864bfb_var;
  96         info->pseudo_palette = NULL;
  97         info->par = NULL;
  98         info->flags = FBINFO_FLAG_DEFAULT;
  99
 100         if (register_framebuffer(info) < 0)
 101                 goto fballoced;
 102
 103         platform_set_drvdata(device, info);
 104
 105         fb_info(info, "%s frame buffer device\n", info->fix.id);
 106
 107         return 0;
 108
 109 fballoced:
 110         framebuffer_release(info);
 111
 112 none:
 113         return ret;
 114 }
 115
 116 static int cfag12864bfb_remove(struct platform_device *device)
 117 {
 118         struct fb_info *info = platform_get_drvdata(device);
 119
 120         if (info) {
 121                 unregister_framebuffer(info);
 122                 framebuffer_release(info);
 123         }
 124
 125         return 0;
 126 }
 127
 128 static struct platform_driver cfag12864bfb_driver = {
 129         .probe  = cfag12864bfb_probe,
 130         .remove = cfag12864bfb_remove,
 131         .driver = {
 132                 .name   = CFAG12864BFB_NAME,
 133         },
 134 };
 135
 136 static struct platform_device *cfag12864bfb_device;
 137
 138 static int __init cfag12864bfb_init(void)
 139 {
 140         int ret = -EINVAL;
 141
 142         /* cfag12864b_init() must be called first */
 143         if (!cfag12864b_isinited()) {
 144                 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
 145                         "cfag12864b is not initialized\n");
 146                 goto none;
 147         }
 148
 149         if (cfag12864b_enable()) {
 150                 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
 151                         "can't enable cfag12864b refreshing (being used)\n");
 152                 return -ENODEV;
 153         }
 154
 155         ret = platform_driver_register(&cfag12864bfb_driver);
 156
 157         if (!ret) {
 158                 cfag12864bfb_device =
 159                         platform_device_alloc(CFAG12864BFB_NAME, 0);
 160
 161                 if (cfag12864bfb_device)
 162                         ret = platform_device_add(cfag12864bfb_device);
 163                 else
 164                         ret = -ENOMEM;
 165
 166                 if (ret) {
 167                         platform_device_put(cfag12864bfb_device);
 168                         platform_driver_unregister(&cfag12864bfb_driver);
 169                 }
 170         }
 171
 172 none:
 173         return ret;
 174 }
 175
 176 static void __exit cfag12864bfb_exit(void)
 177 {
 178         platform_device_unregister(cfag12864bfb_device);
 179         platform_driver_unregister(&cfag12864bfb_driver);
 180         cfag12864b_disable();
 181 }
 182
 183 module_init(cfag12864bfb_init);
 184 module_exit(cfag12864bfb_exit);
 185
 186 MODULE_LICENSE("GPL v2");
 187 MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
 188 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");