173 lines
3.8 KiB
C
173 lines
3.8 KiB
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_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 <ojeda@kernel.org>");
|
|
MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
|