176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Filename: cfag12864bfb.c
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* Version: 0.1.0
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* Description: cfag12864b LCD framebuffer driver
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* Depends: cfag12864b
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*
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* Author: Copyright (C) Miguel Ojeda <ojeda@kernel.org>
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* Date: 2006-10-31
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/fb.h>
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#include <linux/mm.h>
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#include <linux/platform_device.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/cfag12864b.h>
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#define CFAG12864BFB_NAME "cfag12864bfb"
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static const struct fb_fix_screeninfo cfag12864bfb_fix = {
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.id = "cfag12864b",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO10,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = CFAG12864B_WIDTH / 8,
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.accel = FB_ACCEL_NONE,
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};
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static const struct fb_var_screeninfo cfag12864bfb_var = {
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.xres = CFAG12864B_WIDTH,
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.yres = CFAG12864B_HEIGHT,
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.xres_virtual = CFAG12864B_WIDTH,
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.yres_virtual = CFAG12864B_HEIGHT,
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.bits_per_pixel = 1,
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.red = { 0, 1, 0 },
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.green = { 0, 1, 0 },
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.blue = { 0, 1, 0 },
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.left_margin = 0,
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.right_margin = 0,
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.upper_margin = 0,
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.lower_margin = 0,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct page *pages = virt_to_page(cfag12864b_buffer);
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return vm_map_pages_zero(vma, &pages, 1);
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}
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static const struct fb_ops cfag12864bfb_ops = {
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.owner = THIS_MODULE,
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.fb_read = fb_sys_read,
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.fb_write = fb_sys_write,
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.fb_fillrect = sys_fillrect,
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.fb_copyarea = sys_copyarea,
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.fb_imageblit = sys_imageblit,
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.fb_mmap = cfag12864bfb_mmap,
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};
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static int cfag12864bfb_probe(struct platform_device *device)
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{
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int ret = -EINVAL;
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struct fb_info *info = framebuffer_alloc(0, &device->dev);
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if (!info)
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goto none;
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info->screen_base = (char __iomem *) cfag12864b_buffer;
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info->screen_size = CFAG12864B_SIZE;
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info->fbops = &cfag12864bfb_ops;
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info->fix = cfag12864bfb_fix;
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info->var = cfag12864bfb_var;
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info->pseudo_palette = NULL;
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info->par = NULL;
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info->flags = FBINFO_FLAG_DEFAULT;
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if (register_framebuffer(info) < 0)
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goto fballoced;
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platform_set_drvdata(device, info);
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fb_info(info, "%s frame buffer device\n", info->fix.id);
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return 0;
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fballoced:
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framebuffer_release(info);
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none:
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return ret;
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}
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static int cfag12864bfb_remove(struct platform_device *device)
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{
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struct fb_info *info = platform_get_drvdata(device);
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if (info) {
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unregister_framebuffer(info);
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framebuffer_release(info);
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}
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return 0;
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}
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static struct platform_driver cfag12864bfb_driver = {
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.probe = cfag12864bfb_probe,
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.remove = cfag12864bfb_remove,
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.driver = {
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.name = CFAG12864BFB_NAME,
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},
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};
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static struct platform_device *cfag12864bfb_device;
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static int __init cfag12864bfb_init(void)
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{
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int ret = -EINVAL;
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/* cfag12864b_init() must be called first */
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if (!cfag12864b_isinited()) {
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printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
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"cfag12864b is not initialized\n");
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goto none;
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}
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if (cfag12864b_enable()) {
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printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
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"can't enable cfag12864b refreshing (being used)\n");
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return -ENODEV;
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}
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ret = platform_driver_register(&cfag12864bfb_driver);
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if (!ret) {
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cfag12864bfb_device =
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platform_device_alloc(CFAG12864BFB_NAME, 0);
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if (cfag12864bfb_device)
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ret = platform_device_add(cfag12864bfb_device);
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else
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ret = -ENOMEM;
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if (ret) {
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platform_device_put(cfag12864bfb_device);
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platform_driver_unregister(&cfag12864bfb_driver);
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}
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}
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none:
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return ret;
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}
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static void __exit cfag12864bfb_exit(void)
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{
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platform_device_unregister(cfag12864bfb_device);
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platform_driver_unregister(&cfag12864bfb_driver);
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cfag12864b_disable();
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}
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module_init(cfag12864bfb_init);
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module_exit(cfag12864bfb_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Miguel Ojeda <ojeda@kernel.org>");
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MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver");
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