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
23static 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
34static 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
50static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
51{
52	struct page *pages = virt_to_page(cfag12864b_buffer);
53
54	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
55
56	return vm_map_pages_zero(vma, &pages, 1);
57}
58
59static const struct fb_ops cfag12864bfb_ops = {
60	.owner = THIS_MODULE,
61	__FB_DEFAULT_SYSMEM_OPS_RDWR,
62	__FB_DEFAULT_SYSMEM_OPS_DRAW,
63	.fb_mmap = cfag12864bfb_mmap,
64};
65
66static int cfag12864bfb_probe(struct platform_device *device)
67{
68	int ret = -EINVAL;
69	struct fb_info *info = framebuffer_alloc(0, &device->dev);
70
71	if (!info)
72		goto none;
73
74	info->flags = FBINFO_VIRTFB;
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
92fballoced:
93	framebuffer_release(info);
94
95none:
96	return ret;
97}
98
99static void 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
109static struct platform_driver cfag12864bfb_driver = {
110	.probe	= cfag12864bfb_probe,
111	.remove_new = cfag12864bfb_remove,
112	.driver = {
113		.name	= CFAG12864BFB_NAME,
114	},
115};
116
117static struct platform_device *cfag12864bfb_device;
118
119static int __init cfag12864bfb_init(void)
120{
121	int ret = -EINVAL;
122
123	/* cfag12864b_init() must be called first */
124	if (!cfag12864b_isinited()) {
125		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
126			"cfag12864b is not initialized\n");
127		goto none;
128	}
129
130	if (cfag12864b_enable()) {
131		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
132			"can't enable cfag12864b refreshing (being used)\n");
133		return -ENODEV;
134	}
135
136	ret = platform_driver_register(&cfag12864bfb_driver);
137
138	if (!ret) {
139		cfag12864bfb_device =
140			platform_device_alloc(CFAG12864BFB_NAME, 0);
141
142		if (cfag12864bfb_device)
143			ret = platform_device_add(cfag12864bfb_device);
144		else
145			ret = -ENOMEM;
146
147		if (ret) {
148			platform_device_put(cfag12864bfb_device);
149			platform_driver_unregister(&cfag12864bfb_driver);
150		}
151	}
152
153none:
154	return ret;
155}
156
157static void __exit cfag12864bfb_exit(void)
158{
159	platform_device_unregister(cfag12864bfb_device);
160	platform_driver_unregister(&cfag12864bfb_driver);
161	cfag12864b_disable();
162}
163
164module_init(cfag12864bfb_init);
165module_exit(cfag12864bfb_exit);
166
167MODULE_LICENSE("GPL v2");
168MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
169MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
170