[mirror_ubuntu-jammy-kernel.git] / drivers / auxdisplay / cfag12864bfb.c

// SPDX-License-Identifier: GPL-2.0
/*
 *    Filename: cfag12864bfb.c
 *     Version: 0.1.0
 * Description: cfag12864b LCD framebuffer driver
 *     Depends: cfag12864b
 *
 *      Author: Copyright (C) Miguel Ojeda Sandonis
 *        Date: 2006-10-31
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/cfag12864b.h>

#define CFAG12864BFB_NAME "cfag12864bfb"

static const struct fb_fix_screeninfo cfag12864bfb_fix = {
	.id = "cfag12864b",
	.type = FB_TYPE_PACKED_PIXELS,
	.visual = FB_VISUAL_MONO10,
	.xpanstep = 0,
	.ypanstep = 0,
	.ywrapstep = 0,
	.line_length = CFAG12864B_WIDTH / 8,
	.accel = FB_ACCEL_NONE,
};

static const struct fb_var_screeninfo cfag12864bfb_var = {
	.xres = CFAG12864B_WIDTH,
	.yres = CFAG12864B_HEIGHT,
	.xres_virtual = CFAG12864B_WIDTH,
	.yres_virtual = CFAG12864B_HEIGHT,
	.bits_per_pixel = 1,
	.red = { 0, 1, 0 },
      	.green = { 0, 1, 0 },
      	.blue = { 0, 1, 0 },
	.left_margin = 0,
	.right_margin = 0,
	.upper_margin = 0,
	.lower_margin = 0,
	.vmode = FB_VMODE_NONINTERLACED,
};

static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	struct page *pages = virt_to_page(cfag12864b_buffer);

	return vm_map_pages_zero(vma, &pages, 1);
}

static const struct fb_ops cfag12864bfb_ops = {
	.owner = THIS_MODULE,
	.fb_read = fb_sys_read,
	.fb_write = fb_sys_write,
	.fb_fillrect = sys_fillrect,
	.fb_copyarea = sys_copyarea,
	.fb_imageblit = sys_imageblit,
	.fb_mmap = cfag12864bfb_mmap,
};

static int cfag12864bfb_probe(struct platform_device *device)
{
	int ret = -EINVAL;
 	struct fb_info *info = framebuffer_alloc(0, &device->dev);

	if (!info)
		goto none;

	info->screen_base = (char __iomem *) cfag12864b_buffer;
	info->screen_size = CFAG12864B_SIZE;
	info->fbops = &cfag12864bfb_ops;
	info->fix = cfag12864bfb_fix;
	info->var = cfag12864bfb_var;
	info->pseudo_palette = NULL;
	info->par = NULL;
	info->flags = FBINFO_FLAG_DEFAULT;

	if (register_framebuffer(info) < 0)
		goto fballoced;

	platform_set_drvdata(device, info);

	fb_info(info, "%s frame buffer device\n", info->fix.id);

	return 0;

fballoced:
	framebuffer_release(info);

none:
	return ret;
}

static int cfag12864bfb_remove(struct platform_device *device)
{
	struct fb_info *info = platform_get_drvdata(device);

	if (info) {
		unregister_framebuffer(info);
		framebuffer_release(info);
	}

	return 0;
}

static struct platform_driver cfag12864bfb_driver = {
	.probe	= cfag12864bfb_probe,
	.remove = cfag12864bfb_remove,
	.driver = {
		.name	= CFAG12864BFB_NAME,
	},
};

static struct platform_device *cfag12864bfb_device;

static int __init cfag12864bfb_init(void)
{
	int ret = -EINVAL;

	/* cfag12864b_init() must be called first */
	if (!cfag12864b_isinited()) {
		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
			"cfag12864b is not initialized\n");
		goto none;
	}

	if (cfag12864b_enable()) {
		printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
			"can't enable cfag12864b refreshing (being used)\n");
		return -ENODEV;
	}

	ret = platform_driver_register(&cfag12864bfb_driver);

	if (!ret) {
		cfag12864bfb_device =
			platform_device_alloc(CFAG12864BFB_NAME, 0);

		if (cfag12864bfb_device)
			ret = platform_device_add(cfag12864bfb_device);
		else
			ret = -ENOMEM;

		if (ret) {
			platform_device_put(cfag12864bfb_device);
			platform_driver_unregister(&cfag12864bfb_driver);
		}
	}

none:
	return ret;
}

static void __exit cfag12864bfb_exit(void)
{
	platform_device_unregister(cfag12864bfb_device);
	platform_driver_unregister(&cfag12864bfb_driver);
	cfag12864b_disable();
}

module_init(cfag12864bfb_init);
module_exit(cfag12864bfb_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
Commit	Line	Data
351f683b	1	// SPDX-License-Identifier: GPL-2.0
70e84049 MOS	2	/*
	3	* Filename: cfag12864bfb.c
	4	* Version: 0.1.0
	5	* Description: cfag12864b LCD framebuffer driver
70e84049 MOS	6	* Depends: cfag12864b
70e84049 MOS	7	*
450c622e	8	* Author: Copyright (C) Miguel Ojeda Sandonis
70e84049	9	* Date: 2006-10-31
70e84049 MOS	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>
70e84049 MOS	20	#include <linux/string.h>
	21	#include <linux/uaccess.h>
	22	#include <linux/cfag12864b.h>
	23
	24	#define CFAG12864BFB_NAME "cfag12864bfb"
	25
7223310f	26	static const struct fb_fix_screeninfo cfag12864bfb_fix = {
70e84049 MOS	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
7223310f	37	static const struct fb_var_screeninfo cfag12864bfb_var = {
70e84049 MOS	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
	53	static int cfag12864bfb_mmap(struct fb_info info, struct vm_area_struct vma)
	54	{
461e274b SJ	55	struct page *pages = virt_to_page(cfag12864b_buffer);
	56
	57	return vm_map_pages_zero(vma, &pages, 1);
70e84049 MOS	58	}
70e84049 MOS	59
bd223ac6	60	static const struct fb_ops cfag12864bfb_ops = {
70e84049	61	.owner = THIS_MODULE,
bfeeffbb AO	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,
70e84049 MOS	67	.fb_mmap = cfag12864bfb_mmap,
	68	};
	69
0fe763c5	70	static int cfag12864bfb_probe(struct platform_device *device)
70e84049 MOS	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
31b6780c	92	fb_info(info, "%s frame buffer device\n", info->fix.id);
70e84049 MOS	93
	94	return 0;
	95
	96	fballoced:
	97	framebuffer_release(info);
	98
	99	none:
	100	return ret;
	101	}
	102
0fe763c5	103	static int cfag12864bfb_remove(struct platform_device *device)
70e84049 MOS	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
	115	static struct platform_driver cfag12864bfb_driver = {
	116	.probe = cfag12864bfb_probe,
0fe763c5	117	.remove = cfag12864bfb_remove,
70e84049 MOS	118	.driver = {
	119	.name = CFAG12864BFB_NAME,
	120	},
	121	};
	122
	123	static struct platform_device *cfag12864bfb_device;
	124
	125	static int __init cfag12864bfb_init(void)
	126	{
34173a4a MO	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	}
70e84049 MOS	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
34173a4a	159	none:
70e84049 MOS	160	return ret;
	161	}
	162
	163	static void __exit cfag12864bfb_exit(void)
	164	{
	165	platform_device_unregister(cfag12864bfb_device);
	166	platform_driver_unregister(&cfag12864bfb_driver);
	167	cfag12864b_disable();
	168	}
	169
	170	module_init(cfag12864bfb_init);
	171	module_exit(cfag12864bfb_exit);
	172
	173	MODULE_LICENSE("GPL v2");
450c622e	174	MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>");
70e84049	175	MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");