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
26static 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
37static 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
53static 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
60static const 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
70static 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
96fballoced:
97	framebuffer_release(info);
98
99none:
100	return ret;
101}
102
103static 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
115static struct platform_driver cfag12864bfb_driver = {
116	.probe	= cfag12864bfb_probe,
117	.remove = cfag12864bfb_remove,
118	.driver = {
119		.name	= CFAG12864BFB_NAME,
120	},
121};
122
123static struct platform_device *cfag12864bfb_device;
124
125static 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
159none:
160	return ret;
161}
162
163static void __exit cfag12864bfb_exit(void)
164{
165	platform_device_unregister(cfag12864bfb_device);
166	platform_driver_unregister(&cfag12864bfb_driver);
167	cfag12864b_disable();
168}
169
170module_init(cfag12864bfb_init);
171module_exit(cfag12864bfb_exit);
172
173MODULE_LICENSE("GPL v2");
174MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
175MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
176