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