linux/drivers/auxdisplay/cfag12864bfb.c
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   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
  40static 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
  51static 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
  67static 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
  73static 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
  83static 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        printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
 106                info->fix.id);
 107
 108        return 0;
 109
 110fballoced:
 111        framebuffer_release(info);
 112
 113none:
 114        return ret;
 115}
 116
 117static int cfag12864bfb_remove(struct platform_device *device)
 118{
 119        struct fb_info *info = platform_get_drvdata(device);
 120
 121        if (info) {
 122                unregister_framebuffer(info);
 123                framebuffer_release(info);
 124        }
 125
 126        return 0;
 127}
 128
 129static struct platform_driver cfag12864bfb_driver = {
 130        .probe  = cfag12864bfb_probe,
 131        .remove = cfag12864bfb_remove,
 132        .driver = {
 133                .name   = CFAG12864BFB_NAME,
 134        },
 135};
 136
 137static struct platform_device *cfag12864bfb_device;
 138
 139static int __init cfag12864bfb_init(void)
 140{
 141        int ret = -EINVAL;
 142
 143        /* cfag12864b_init() must be called first */
 144        if (!cfag12864b_isinited()) {
 145                printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
 146                        "cfag12864b is not initialized\n");
 147                goto none;
 148        }
 149
 150        if (cfag12864b_enable()) {
 151                printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
 152                        "can't enable cfag12864b refreshing (being used)\n");
 153                return -ENODEV;
 154        }
 155
 156        ret = platform_driver_register(&cfag12864bfb_driver);
 157
 158        if (!ret) {
 159                cfag12864bfb_device =
 160                        platform_device_alloc(CFAG12864BFB_NAME, 0);
 161
 162                if (cfag12864bfb_device)
 163                        ret = platform_device_add(cfag12864bfb_device);
 164                else
 165                        ret = -ENOMEM;
 166
 167                if (ret) {
 168                        platform_device_put(cfag12864bfb_device);
 169                        platform_driver_unregister(&cfag12864bfb_driver);
 170                }
 171        }
 172
 173none:
 174        return ret;
 175}
 176
 177static void __exit cfag12864bfb_exit(void)
 178{
 179        platform_device_unregister(cfag12864bfb_device);
 180        platform_driver_unregister(&cfag12864bfb_driver);
 181        cfag12864b_disable();
 182}
 183
 184module_init(cfag12864bfb_init);
 185module_exit(cfag12864bfb_exit);
 186
 187MODULE_LICENSE("GPL v2");
 188MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
 189MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
 190
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