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// 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);
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
return vm_map_pages_zero(vma, &pages, 1);
}
static const struct fb_ops cfag12864bfb_ops = {
.owner = THIS_MODULE,
__FB_DEFAULT_SYSMEM_OPS_RDWR,
__FB_DEFAULT_SYSMEM_OPS_DRAW,
.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->flags = FBINFO_VIRTFB;
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;
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");
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