1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Filename: cfag12864bfb.c 4 * Version: 0.1.0 5 * Description: cfag12864b LCD framebuffer driver 6 * Depends: cfag12864b 7 * 8 * Author: Copyright (C) Miguel Ojeda Sandonis 9 * Date: 2006-10-31 10 */ 11 12 #include <linux/init.h> 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/delay.h> 16 #include <linux/errno.h> 17 #include <linux/fb.h> 18 #include <linux/mm.h> 19 #include <linux/platform_device.h> 20 #include <linux/string.h> 21 #include <linux/uaccess.h> 22 #include <linux/cfag12864b.h> 23 24 #define CFAG12864BFB_NAME "cfag12864bfb" 25 26 static const struct fb_fix_screeninfo cfag12864bfb_fix = { 27 .id = "cfag12864b", 28 .type = FB_TYPE_PACKED_PIXELS, 29 .visual = FB_VISUAL_MONO10, 30 .xpanstep = 0, 31 .ypanstep = 0, 32 .ywrapstep = 0, 33 .line_length = CFAG12864B_WIDTH / 8, 34 .accel = FB_ACCEL_NONE, 35 }; 36 37 static const struct fb_var_screeninfo cfag12864bfb_var = { 38 .xres = CFAG12864B_WIDTH, 39 .yres = CFAG12864B_HEIGHT, 40 .xres_virtual = CFAG12864B_WIDTH, 41 .yres_virtual = CFAG12864B_HEIGHT, 42 .bits_per_pixel = 1, 43 .red = { 0, 1, 0 }, 44 .green = { 0, 1, 0 }, 45 .blue = { 0, 1, 0 }, 46 .left_margin = 0, 47 .right_margin = 0, 48 .upper_margin = 0, 49 .lower_margin = 0, 50 .vmode = FB_VMODE_NONINTERLACED, 51 }; 52 53 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma) 54 { 55 struct page *pages = virt_to_page(cfag12864b_buffer); 56 57 return vm_map_pages_zero(vma, &pages, 1); 58 } 59 60 static struct fb_ops cfag12864bfb_ops = { 61 .owner = THIS_MODULE, 62 .fb_read = fb_sys_read, 63 .fb_write = fb_sys_write, 64 .fb_fillrect = sys_fillrect, 65 .fb_copyarea = sys_copyarea, 66 .fb_imageblit = sys_imageblit, 67 .fb_mmap = cfag12864bfb_mmap, 68 }; 69 70 static int cfag12864bfb_probe(struct platform_device *device) 71 { 72 int ret = -EINVAL; 73 struct fb_info *info = framebuffer_alloc(0, &device->dev); 74 75 if (!info) 76 goto none; 77 78 info->screen_base = (char __iomem *) cfag12864b_buffer; 79 info->screen_size = CFAG12864B_SIZE; 80 info->fbops = &cfag12864bfb_ops; 81 info->fix = cfag12864bfb_fix; 82 info->var = cfag12864bfb_var; 83 info->pseudo_palette = NULL; 84 info->par = NULL; 85 info->flags = FBINFO_FLAG_DEFAULT; 86 87 if (register_framebuffer(info) < 0) 88 goto fballoced; 89 90 platform_set_drvdata(device, info); 91 92 fb_info(info, "%s frame buffer device\n", info->fix.id); 93 94 return 0; 95 96 fballoced: 97 framebuffer_release(info); 98 99 none: 100 return ret; 101 } 102 103 static int cfag12864bfb_remove(struct platform_device *device) 104 { 105 struct fb_info *info = platform_get_drvdata(device); 106 107 if (info) { 108 unregister_framebuffer(info); 109 framebuffer_release(info); 110 } 111 112 return 0; 113 } 114 115 static struct platform_driver cfag12864bfb_driver = { 116 .probe = cfag12864bfb_probe, 117 .remove = cfag12864bfb_remove, 118 .driver = { 119 .name = CFAG12864BFB_NAME, 120 }, 121 }; 122 123 static struct platform_device *cfag12864bfb_device; 124 125 static int __init cfag12864bfb_init(void) 126 { 127 int ret = -EINVAL; 128 129 /* cfag12864b_init() must be called first */ 130 if (!cfag12864b_isinited()) { 131 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " 132 "cfag12864b is not initialized\n"); 133 goto none; 134 } 135 136 if (cfag12864b_enable()) { 137 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " 138 "can't enable cfag12864b refreshing (being used)\n"); 139 return -ENODEV; 140 } 141 142 ret = platform_driver_register(&cfag12864bfb_driver); 143 144 if (!ret) { 145 cfag12864bfb_device = 146 platform_device_alloc(CFAG12864BFB_NAME, 0); 147 148 if (cfag12864bfb_device) 149 ret = platform_device_add(cfag12864bfb_device); 150 else 151 ret = -ENOMEM; 152 153 if (ret) { 154 platform_device_put(cfag12864bfb_device); 155 platform_driver_unregister(&cfag12864bfb_driver); 156 } 157 } 158 159 none: 160 return ret; 161 } 162 163 static void __exit cfag12864bfb_exit(void) 164 { 165 platform_device_unregister(cfag12864bfb_device); 166 platform_driver_unregister(&cfag12864bfb_driver); 167 cfag12864b_disable(); 168 } 169 170 module_init(cfag12864bfb_init); 171 module_exit(cfag12864bfb_exit); 172 173 MODULE_LICENSE("GPL v2"); 174 MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>"); 175 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver"); 176