Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[platform/kernel/linux-starfive.git] / drivers / auxdisplay / cfag12864bfb.c
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
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
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_base = (char __iomem *) 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         info->flags = FBINFO_FLAG_DEFAULT;
83
84         if (register_framebuffer(info) < 0)
85                 goto fballoced;
86
87         platform_set_drvdata(device, info);
88
89         fb_info(info, "%s frame buffer device\n", info->fix.id);
90
91         return 0;
92
93 fballoced:
94         framebuffer_release(info);
95
96 none:
97         return ret;
98 }
99
100 static int cfag12864bfb_remove(struct platform_device *device)
101 {
102         struct fb_info *info = platform_get_drvdata(device);
103
104         if (info) {
105                 unregister_framebuffer(info);
106                 framebuffer_release(info);
107         }
108
109         return 0;
110 }
111
112 static struct platform_driver cfag12864bfb_driver = {
113         .probe  = cfag12864bfb_probe,
114         .remove = cfag12864bfb_remove,
115         .driver = {
116                 .name   = CFAG12864BFB_NAME,
117         },
118 };
119
120 static struct platform_device *cfag12864bfb_device;
121
122 static int __init cfag12864bfb_init(void)
123 {
124         int ret = -EINVAL;
125
126         /* cfag12864b_init() must be called first */
127         if (!cfag12864b_isinited()) {
128                 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
129                         "cfag12864b is not initialized\n");
130                 goto none;
131         }
132
133         if (cfag12864b_enable()) {
134                 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
135                         "can't enable cfag12864b refreshing (being used)\n");
136                 return -ENODEV;
137         }
138
139         ret = platform_driver_register(&cfag12864bfb_driver);
140
141         if (!ret) {
142                 cfag12864bfb_device =
143                         platform_device_alloc(CFAG12864BFB_NAME, 0);
144
145                 if (cfag12864bfb_device)
146                         ret = platform_device_add(cfag12864bfb_device);
147                 else
148                         ret = -ENOMEM;
149
150                 if (ret) {
151                         platform_device_put(cfag12864bfb_device);
152                         platform_driver_unregister(&cfag12864bfb_driver);
153                 }
154         }
155
156 none:
157         return ret;
158 }
159
160 static void __exit cfag12864bfb_exit(void)
161 {
162         platform_device_unregister(cfag12864bfb_device);
163         platform_driver_unregister(&cfag12864bfb_driver);
164         cfag12864b_disable();
165 }
166
167 module_init(cfag12864bfb_init);
168 module_exit(cfag12864bfb_exit);
169
170 MODULE_LICENSE("GPL v2");
171 MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
172 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");