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/slab.h>
35 #include <linux/string.h>
36 #include <linux/uaccess.h>
37 #include <linux/cfag12864b.h>
38
39 #define CFAG12864BFB_NAME "cfag12864bfb"
40
41 static struct fb_fix_screeninfo cfag12864bfb_fix __initdata = {
42 .id = "cfag12864b",
43 .type = FB_TYPE_PACKED_PIXELS,
44 .visual = FB_VISUAL_MONO10,
45 .xpanstep = 0,
46 .ypanstep = 0,
47 .ywrapstep = 0,
48 .line_length = CFAG12864B_WIDTH / 8,
49 .accel = FB_ACCEL_NONE,
50 };
51
52 static struct fb_var_screeninfo cfag12864bfb_var __initdata = {
53 .xres = CFAG12864B_WIDTH,
54 .yres = CFAG12864B_HEIGHT,
55 .xres_virtual = CFAG12864B_WIDTH,
56 .yres_virtual = CFAG12864B_HEIGHT,
57 .bits_per_pixel = 1,
58 .red = { 0, 1, 0 },
59 .green = { 0, 1, 0 },
60 .blue = { 0, 1, 0 },
61 .left_margin = 0,
62 .right_margin = 0,
63 .upper_margin = 0,
64 .lower_margin = 0,
65 .vmode = FB_VMODE_NONINTERLACED,
66 };
67
68 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
69 {
70 return vm_insert_page(vma, vma->vm_start,
71 virt_to_page(cfag12864b_buffer));
72 }
73
74 static struct fb_ops cfag12864bfb_ops = {
75 .owner = THIS_MODULE,
76 .fb_read = fb_sys_read,
77 .fb_write = fb_sys_write,
78 .fb_fillrect = sys_fillrect,
79 .fb_copyarea = sys_copyarea,
80 .fb_imageblit = sys_imageblit,
81 .fb_mmap = cfag12864bfb_mmap,
82 };
83
84 static int __init cfag12864bfb_probe(struct platform_device *device)
85 {
86 int ret = -EINVAL;
87 struct fb_info *info = framebuffer_alloc(0, &device->dev);
88
89 if (!info)
90 goto none;
91
92 info->screen_base = (char __iomem *) cfag12864b_buffer;
93 info->screen_size = CFAG12864B_SIZE;
94 info->fbops = &cfag12864bfb_ops;
95 info->fix = cfag12864bfb_fix;
96 info->var = cfag12864bfb_var;
97 info->pseudo_palette = NULL;
98 info->par = NULL;
99 info->flags = FBINFO_FLAG_DEFAULT;
100
101 if (register_framebuffer(info) < 0)
102 goto fballoced;
103
104 platform_set_drvdata(device, info);
105
106 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
107 info->fix.id);
108
109 return 0;
110
111 fballoced:
112 framebuffer_release(info);
113
114 none:
115 return ret;
116 }
117
118 static int cfag12864bfb_remove(struct platform_device *device)
119 {
120 struct fb_info *info = platform_get_drvdata(device);
121
122 if (info) {
123 unregister_framebuffer(info);
124 framebuffer_release(info);
125 }
126
127 return 0;
128 }
129
130 static struct platform_driver cfag12864bfb_driver = {
131 .probe = cfag12864bfb_probe,
132 .remove = cfag12864bfb_remove,
133 .driver = {
134 .name = CFAG12864BFB_NAME,
135 },
136 };
137
138 static struct platform_device *cfag12864bfb_device;
139
140 static int __init cfag12864bfb_init(void)
141 {
142 int ret = -EINVAL;
143
144 /* cfag12864b_init() must be called first */
145 if (!cfag12864b_isinited()) {
146 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
147 "cfag12864b is not initialized\n");
148 goto none;
149 }
150
151 if (cfag12864b_enable()) {
152 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
153 "can't enable cfag12864b refreshing (being used)\n");
154 return -ENODEV;
155 }
156
157 ret = platform_driver_register(&cfag12864bfb_driver);
158
159 if (!ret) {
160 cfag12864bfb_device =
161 platform_device_alloc(CFAG12864BFB_NAME, 0);
162
163 if (cfag12864bfb_device)
164 ret = platform_device_add(cfag12864bfb_device);
165 else
166 ret = -ENOMEM;
167
168 if (ret) {
169 platform_device_put(cfag12864bfb_device);
170 platform_driver_unregister(&cfag12864bfb_driver);
171 }
172 }
173
174 none:
175 return ret;
176 }
177
178 static void __exit cfag12864bfb_exit(void)
179 {
180 platform_device_unregister(cfag12864bfb_device);
181 platform_driver_unregister(&cfag12864bfb_driver);
182 cfag12864b_disable();
183 }
184
185 module_init(cfag12864bfb_init);
186 module_exit(cfag12864bfb_exit);
187
188 MODULE_LICENSE("GPL v2");
189 MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
190 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
191
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