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
23 static 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
34 static 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
cfag12864bfb_mmap(struct fb_info * info,struct vm_area_struct * vma)50 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
51 {
52 struct page *pages = virt_to_page(cfag12864b_buffer);
53
54 return vm_map_pages_zero(vma, &pages, 1);
55 }
56
57 static const struct fb_ops cfag12864bfb_ops = {
58 .owner = THIS_MODULE,
59 .fb_read = fb_sys_read,
60 .fb_write = fb_sys_write,
61 .fb_fillrect = sys_fillrect,
62 .fb_copyarea = sys_copyarea,
63 .fb_imageblit = sys_imageblit,
64 .fb_mmap = cfag12864bfb_mmap,
65 };
66
cfag12864bfb_probe(struct platform_device * device)67 static int cfag12864bfb_probe(struct platform_device *device)
68 {
69 int ret = -EINVAL;
70 struct fb_info *info = framebuffer_alloc(0, &device->dev);
71
72 if (!info)
73 goto none;
74
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
92 fballoced:
93 framebuffer_release(info);
94
95 none:
96 return ret;
97 }
98
cfag12864bfb_remove(struct platform_device * device)99 static 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
111 static struct platform_driver cfag12864bfb_driver = {
112 .probe = cfag12864bfb_probe,
113 .remove = cfag12864bfb_remove,
114 .driver = {
115 .name = CFAG12864BFB_NAME,
116 },
117 };
118
119 static struct platform_device *cfag12864bfb_device;
120
cfag12864bfb_init(void)121 static 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
155 none:
156 return ret;
157 }
158
cfag12864bfb_exit(void)159 static void __exit cfag12864bfb_exit(void)
160 {
161 platform_device_unregister(cfag12864bfb_device);
162 platform_driver_unregister(&cfag12864bfb_driver);
163 cfag12864b_disable();
164 }
165
166 module_init(cfag12864bfb_init);
167 module_exit(cfag12864bfb_exit);
168
169 MODULE_LICENSE("GPL v2");
170 MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
171 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
172
