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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	fb_info(info, "%s frame buffer device\n", info->fix.id);
106
107	return 0;
108
109fballoced:
110	framebuffer_release(info);
111
112none:
113	return ret;
114}
115
116static 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
128static struct platform_driver cfag12864bfb_driver = {
129	.probe	= cfag12864bfb_probe,
130	.remove = cfag12864bfb_remove,
131	.driver = {
132		.name	= CFAG12864BFB_NAME,
133	},
134};
135
136static struct platform_device *cfag12864bfb_device;
137
138static 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
172none:
173	return ret;
174}
175
176static void __exit cfag12864bfb_exit(void)
177{
178	platform_device_unregister(cfag12864bfb_device);
179	platform_driver_unregister(&cfag12864bfb_driver);
180	cfag12864b_disable();
181}
182
183module_init(cfag12864bfb_init);
184module_exit(cfag12864bfb_exit);
185
186MODULE_LICENSE("GPL v2");
187MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
188MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
189