[linux-2.6-block.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 <ojeda@kernel.org>
 *        Date: 2006-10-31
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/mm.h>
#include <linux/platform_device.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_buffer = 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 <ojeda@kernel.org>");
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	*
c131bd0b	8	* Author: Copyright (C) Miguel Ojeda <ojeda@kernel.org>
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>
70e84049 MOS	15	#include <linux/errno.h>
	16	#include <linux/fb.h>
	17	#include <linux/mm.h>
	18	#include <linux/platform_device.h>
70e84049 MOS	19	#include <linux/cfag12864b.h>
	20
	21	#define CFAG12864BFB_NAME "cfag12864bfb"
	22
7223310f	23	static const struct fb_fix_screeninfo cfag12864bfb_fix = {
70e84049 MOS	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
7223310f	34	static const struct fb_var_screeninfo cfag12864bfb_var = {
70e84049 MOS	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 },
4e5d74fc HD	41	.green = { 0, 1, 0 },
4e5d74fc HD	42	.blue = { 0, 1, 0 },
70e84049 MOS	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	{
461e274b SJ	52	struct page *pages = virt_to_page(cfag12864b_buffer);
	53
	54	return vm_map_pages_zero(vma, &pages, 1);
70e84049 MOS	55	}
70e84049 MOS	56
bd223ac6	57	static const struct fb_ops cfag12864bfb_ops = {
70e84049	58	.owner = THIS_MODULE,
bfeeffbb AO	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,
70e84049 MOS	64	.fb_mmap = cfag12864bfb_mmap,
	65	};
	66
0fe763c5	67	static int cfag12864bfb_probe(struct platform_device *device)
70e84049 MOS	68	{
70e84049 MOS	69	int ret = -EINVAL;
4e5d74fc	70	struct fb_info *info = framebuffer_alloc(0, &device->dev);
70e84049 MOS	71
	72	if (!info)
	73	goto none;
	74
11f373c3	75	info->screen_buffer = cfag12864b_buffer;
70e84049 MOS	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
31b6780c	89	fb_info(info, "%s frame buffer device\n", info->fix.id);
70e84049 MOS	90
	91	return 0;
	92
	93	fballoced:
	94	framebuffer_release(info);
	95
	96	none:
	97	return ret;
	98	}
	99
0fe763c5	100	static int cfag12864bfb_remove(struct platform_device *device)
70e84049 MOS	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,
0fe763c5	114	.remove = cfag12864bfb_remove,
70e84049 MOS	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	{
34173a4a MO	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	}
70e84049 MOS	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
34173a4a	156	none:
70e84049 MOS	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");
c131bd0b	171	MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
70e84049	172	MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");