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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
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
