// 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");