Linux Kernel  3.7.1
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q40fb.c
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1 /*
2  * linux/drivers/video/q40fb.c -- Q40 frame buffer device
3  *
4  * Copyright (C) 2001
5  *
6  * Richard Zidlicky <[email protected]>
7  *
8  * This file is subject to the terms and conditions of the GNU General Public
9  * License. See the file COPYING in the main directory of this archive for
10  * more details.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/mm.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
19 #include <linux/platform_device.h>
20 
21 #include <asm/uaccess.h>
22 #include <asm/setup.h>
23 #include <asm/q40_master.h>
24 #include <linux/fb.h>
25 #include <linux/module.h>
26 #include <asm/pgtable.h>
27 
28 #define Q40_PHYS_SCREEN_ADDR 0xFE800000
29 
30 static struct fb_fix_screeninfo q40fb_fix __devinitdata = {
31  .id = "Q40",
32  .smem_len = 1024*1024,
33  .type = FB_TYPE_PACKED_PIXELS,
34  .visual = FB_VISUAL_TRUECOLOR,
35  .line_length = 1024*2,
36  .accel = FB_ACCEL_NONE,
37 };
38 
39 static struct fb_var_screeninfo q40fb_var __devinitdata = {
40  .xres = 1024,
41  .yres = 512,
42  .xres_virtual = 1024,
43  .yres_virtual = 512,
44  .bits_per_pixel = 16,
45  .red = {6, 5, 0},
46  .green = {11, 5, 0},
47  .blue = {0, 6, 0},
48  .activate = FB_ACTIVATE_NOW,
49  .height = 230,
50  .width = 300,
51  .vmode = FB_VMODE_NONINTERLACED,
52 };
53 
54 static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
55  unsigned blue, unsigned transp,
56  struct fb_info *info)
57 {
58  /*
59  * Set a single color register. The values supplied have a 16 bit
60  * magnitude.
61  * Return != 0 for invalid regno.
62  */
63 
64  if (regno > 255)
65  return 1;
66  red>>=11;
67  green>>=11;
68  blue>>=10;
69 
70  if (regno < 16) {
71  ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
72  ((green & 31) << 11) |
73  (blue & 63);
74  }
75  return 0;
76 }
77 
78 static struct fb_ops q40fb_ops = {
79  .owner = THIS_MODULE,
80  .fb_setcolreg = q40fb_setcolreg,
81  .fb_fillrect = cfb_fillrect,
82  .fb_copyarea = cfb_copyarea,
83  .fb_imageblit = cfb_imageblit,
84 };
85 
86 static int __devinit q40fb_probe(struct platform_device *dev)
87 {
88  struct fb_info *info;
89 
90  if (!MACH_IS_Q40)
91  return -ENXIO;
92 
93  /* mapped in q40/config.c */
94  q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
95 
96  info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
97  if (!info)
98  return -ENOMEM;
99 
100  info->var = q40fb_var;
101  info->fix = q40fb_fix;
102  info->fbops = &q40fb_ops;
103  info->flags = FBINFO_DEFAULT; /* not as module for now */
104  info->pseudo_palette = info->par;
105  info->par = NULL;
106  info->screen_base = (char *) q40fb_fix.smem_start;
107 
108  if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
109  framebuffer_release(info);
110  return -ENOMEM;
111  }
112 
114 
115  if (register_framebuffer(info) < 0) {
116  printk(KERN_ERR "Unable to register Q40 frame buffer\n");
117  fb_dealloc_cmap(&info->cmap);
118  framebuffer_release(info);
119  return -EINVAL;
120  }
121 
122  printk(KERN_INFO "fb%d: Q40 frame buffer alive and kicking !\n",
123  info->node);
124  return 0;
125 }
126 
127 static struct platform_driver q40fb_driver = {
128  .probe = q40fb_probe,
129  .driver = {
130  .name = "q40fb",
131  },
132 };
133 
134 static struct platform_device q40fb_device = {
135  .name = "q40fb",
136 };
137 
139 {
140  int ret = 0;
141 
142  if (fb_get_options("q40fb", NULL))
143  return -ENODEV;
144 
145  ret = platform_driver_register(&q40fb_driver);
146 
147  if (!ret) {
148  ret = platform_device_register(&q40fb_device);
149  if (ret)
150  platform_driver_unregister(&q40fb_driver);
151  }
152  return ret;
153 }
154 
156 MODULE_LICENSE("GPL");