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