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
cfag12864bfb_mmap(struct fb_info * info,struct vm_area_struct * vma)53 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
54 {
55 struct page *pages = virt_to_page(cfag12864b_buffer);
56
57 return vm_map_pages_zero(vma, &pages, 1);
58 }
59
60 static struct fb_ops cfag12864bfb_ops = {
61 .owner = THIS_MODULE,
62 .fb_read = fb_sys_read,
63 .fb_write = fb_sys_write,
64 .fb_fillrect = sys_fillrect,
65 .fb_copyarea = sys_copyarea,
66 .fb_imageblit = sys_imageblit,
67 .fb_mmap = cfag12864bfb_mmap,
68 };
69
cfag12864bfb_probe(struct platform_device * device)70 static int cfag12864bfb_probe(struct platform_device *device)
71 {
72 int ret = -EINVAL;
73 struct fb_info *info = framebuffer_alloc(0, &device->dev);
74
75 if (!info)
76 goto none;
77
78 info->screen_base = (char __iomem *) cfag12864b_buffer;
79 info->screen_size = CFAG12864B_SIZE;
80 info->fbops = &cfag12864bfb_ops;
81 info->fix = cfag12864bfb_fix;
82 info->var = cfag12864bfb_var;
83 info->pseudo_palette = NULL;
84 info->par = NULL;
85 info->flags = FBINFO_FLAG_DEFAULT;
86
87 if (register_framebuffer(info) < 0)
88 goto fballoced;
89
90 platform_set_drvdata(device, info);
91
92 fb_info(info, "%s frame buffer device\n", info->fix.id);
93
94 return 0;
95
96 fballoced:
97 framebuffer_release(info);
98
99 none:
100 return ret;
101 }
102
cfag12864bfb_remove(struct platform_device * device)103 static int cfag12864bfb_remove(struct platform_device *device)
104 {
105 struct fb_info *info = platform_get_drvdata(device);
106
107 if (info) {
108 unregister_framebuffer(info);
109 framebuffer_release(info);
110 }
111
112 return 0;
113 }
114
115 static struct platform_driver cfag12864bfb_driver = {
116 .probe = cfag12864bfb_probe,
117 .remove = cfag12864bfb_remove,
118 .driver = {
119 .name = CFAG12864BFB_NAME,
120 },
121 };
122
123 static struct platform_device *cfag12864bfb_device;
124
cfag12864bfb_init(void)125 static int __init cfag12864bfb_init(void)
126 {
127 int ret = -EINVAL;
128
129 /* cfag12864b_init() must be called first */
130 if (!cfag12864b_isinited()) {
131 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
132 "cfag12864b is not initialized\n");
133 goto none;
134 }
135
136 if (cfag12864b_enable()) {
137 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
138 "can't enable cfag12864b refreshing (being used)\n");
139 return -ENODEV;
140 }
141
142 ret = platform_driver_register(&cfag12864bfb_driver);
143
144 if (!ret) {
145 cfag12864bfb_device =
146 platform_device_alloc(CFAG12864BFB_NAME, 0);
147
148 if (cfag12864bfb_device)
149 ret = platform_device_add(cfag12864bfb_device);
150 else
151 ret = -ENOMEM;
152
153 if (ret) {
154 platform_device_put(cfag12864bfb_device);
155 platform_driver_unregister(&cfag12864bfb_driver);
156 }
157 }
158
159 none:
160 return ret;
161 }
162
cfag12864bfb_exit(void)163 static void __exit cfag12864bfb_exit(void)
164 {
165 platform_device_unregister(cfag12864bfb_device);
166 platform_driver_unregister(&cfag12864bfb_driver);
167 cfag12864b_disable();
168 }
169
170 module_init(cfag12864bfb_init);
171 module_exit(cfag12864bfb_exit);
172
173 MODULE_LICENSE("GPL v2");
174 MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
175 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
176
