drivers/auxdisplay/cfag12864bfb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *    Filename: cfag12864bfb.c
   4  *     Version: 0.1.0
   5  * Description: cfag12864b LCD framebuffer driver
   6  *     Depends: cfag12864b
   7  *
   8  *      Author: Copyright (C) Miguel Ojeda Sandonis
   9  *        Date: 2006-10-31
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/delay.h>
  16 #include <linux/errno.h>
  17 #include <linux/fb.h>
  18 #include <linux/mm.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/string.h>
  21 #include <linux/uaccess.h>
  22 #include <linux/cfag12864b.h>
  23
  24 #define CFAG12864BFB_NAME "cfag12864bfb"
  25
  26 static const struct fb_fix_screeninfo cfag12864bfb_fix = {
  27         .id = "cfag12864b",
  28         .type = FB_TYPE_PACKED_PIXELS,
  29         .visual = FB_VISUAL_MONO10,
  30         .xpanstep = 0,
  31         .ypanstep = 0,
  32         .ywrapstep = 0,
  33         .line_length = CFAG12864B_WIDTH / 8,
  34         .accel = FB_ACCEL_NONE,
  35 };
  36
  37 static const struct fb_var_screeninfo cfag12864bfb_var = {
  38         .xres = CFAG12864B_WIDTH,
  39         .yres = CFAG12864B_HEIGHT,
  40         .xres_virtual = CFAG12864B_WIDTH,
  41         .yres_virtual = CFAG12864B_HEIGHT,
  42         .bits_per_pixel = 1,
  43         .red = { 0, 1, 0 },
  44         .green = { 0, 1, 0 },
  45         .blue = { 0, 1, 0 },
  46         .left_margin = 0,
  47         .right_margin = 0,
  48         .upper_margin = 0,
  49         .lower_margin = 0,
  50         .vmode = FB_VMODE_NONINTERLACED,
  51 };
  52
  53 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
  54 {
  55         return vm_insert_page(vma, vma->vm_start,
  56                 virt_to_page(cfag12864b_buffer));
  57 }
  58
  59 static struct fb_ops cfag12864bfb_ops = {
  60         .owner = THIS_MODULE,
  61         .fb_read = fb_sys_read,
  62         .fb_write = fb_sys_write,
  63         .fb_fillrect = sys_fillrect,
  64         .fb_copyarea = sys_copyarea,
  65         .fb_imageblit = sys_imageblit,
  66         .fb_mmap = cfag12864bfb_mmap,
  67 };
  68
  69 static int cfag12864bfb_probe(struct platform_device *device)
  70 {
  71         int ret = -EINVAL;
  72         struct fb_info *info = framebuffer_alloc(0, &device->dev);
  73
  74         if (!info)
  75                 goto none;
  76
  77         info->screen_base = (char __iomem *) cfag12864b_buffer;
  78         info->screen_size = CFAG12864B_SIZE;
  79         info->fbops = &cfag12864bfb_ops;
  80         info->fix = cfag12864bfb_fix;
  81         info->var = cfag12864bfb_var;
  82         info->pseudo_palette = NULL;
  83         info->par = NULL;
  84         info->flags = FBINFO_FLAG_DEFAULT;
  85
  86         if (register_framebuffer(info) < 0)
  87                 goto fballoced;
  88
  89         platform_set_drvdata(device, info);
  90
  91         fb_info(info, "%s frame buffer device\n", info->fix.id);
  92
  93         return 0;
  94
  95 fballoced:
  96         framebuffer_release(info);
  97
  98 none:
  99         return ret;
 100 }
 101
 102 static int cfag12864bfb_remove(struct platform_device *device)
 103 {
 104         struct fb_info *info = platform_get_drvdata(device);
 105
 106         if (info) {
 107                 unregister_framebuffer(info);
 108                 framebuffer_release(info);
 109         }
 110
 111         return 0;
 112 }
 113
 114 static struct platform_driver cfag12864bfb_driver = {
 115         .probe  = cfag12864bfb_probe,
 116         .remove = cfag12864bfb_remove,
 117         .driver = {
 118                 .name   = CFAG12864BFB_NAME,
 119         },
 120 };
 121
 122 static struct platform_device *cfag12864bfb_device;
 123
 124 static int __init cfag12864bfb_init(void)
 125 {
 126         int ret = -EINVAL;
 127
 128         /* cfag12864b_init() must be called first */
 129         if (!cfag12864b_isinited()) {
 130                 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
 131                         "cfag12864b is not initialized\n");
 132                 goto none;
 133         }
 134
 135         if (cfag12864b_enable()) {
 136                 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
 137                         "can't enable cfag12864b refreshing (being used)\n");
 138                 return -ENODEV;
 139         }
 140
 141         ret = platform_driver_register(&cfag12864bfb_driver);
 142
 143         if (!ret) {
 144                 cfag12864bfb_device =
 145                         platform_device_alloc(CFAG12864BFB_NAME, 0);
 146
 147                 if (cfag12864bfb_device)
 148                         ret = platform_device_add(cfag12864bfb_device);
 149                 else
 150                         ret = -ENOMEM;
 151
 152                 if (ret) {
 153                         platform_device_put(cfag12864bfb_device);
 154                         platform_driver_unregister(&cfag12864bfb_driver);
 155                 }
 156         }
 157
 158 none:
 159         return ret;
 160 }
 161
 162 static void __exit cfag12864bfb_exit(void)
 163 {
 164         platform_device_unregister(cfag12864bfb_device);
 165         platform_driver_unregister(&cfag12864bfb_driver);
 166         cfag12864b_disable();
 167 }
 168
 169 module_init(cfag12864bfb_init);
 170 module_exit(cfag12864bfb_exit);
 171
 172 MODULE_LICENSE("GPL v2");
 173 MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
 174 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");