1 /* 2 * Filename: cfag12864bfb.c 3 * Version: 0.1.0 4 * Description: cfag12864b LCD framebuffer driver 5 * License: GPLv2 6 * Depends: cfag12864b 7 * 8 * Author: Copyright (C) Miguel Ojeda Sandonis 9 * Date: 2006-10-31 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25 26 #include <linux/init.h> 27 #include <linux/module.h> 28 #include <linux/kernel.h> 29 #include <linux/delay.h> 30 #include <linux/errno.h> 31 #include <linux/fb.h> 32 #include <linux/mm.h> 33 #include <linux/platform_device.h> 34 #include <linux/string.h> 35 #include <linux/uaccess.h> 36 #include <linux/cfag12864b.h> 37 38 #define CFAG12864BFB_NAME "cfag12864bfb" 39 40 static struct fb_fix_screeninfo cfag12864bfb_fix = { 41 .id = "cfag12864b", 42 .type = FB_TYPE_PACKED_PIXELS, 43 .visual = FB_VISUAL_MONO10, 44 .xpanstep = 0, 45 .ypanstep = 0, 46 .ywrapstep = 0, 47 .line_length = CFAG12864B_WIDTH / 8, 48 .accel = FB_ACCEL_NONE, 49 }; 50 51 static struct fb_var_screeninfo cfag12864bfb_var = { 52 .xres = CFAG12864B_WIDTH, 53 .yres = CFAG12864B_HEIGHT, 54 .xres_virtual = CFAG12864B_WIDTH, 55 .yres_virtual = CFAG12864B_HEIGHT, 56 .bits_per_pixel = 1, 57 .red = { 0, 1, 0 }, 58 .green = { 0, 1, 0 }, 59 .blue = { 0, 1, 0 }, 60 .left_margin = 0, 61 .right_margin = 0, 62 .upper_margin = 0, 63 .lower_margin = 0, 64 .vmode = FB_VMODE_NONINTERLACED, 65 }; 66 67 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma) 68 { 69 return vm_insert_page(vma, vma->vm_start, 70 virt_to_page(cfag12864b_buffer)); 71 } 72 73 static struct fb_ops cfag12864bfb_ops = { 74 .owner = THIS_MODULE, 75 .fb_read = fb_sys_read, 76 .fb_write = fb_sys_write, 77 .fb_fillrect = sys_fillrect, 78 .fb_copyarea = sys_copyarea, 79 .fb_imageblit = sys_imageblit, 80 .fb_mmap = cfag12864bfb_mmap, 81 }; 82 83 static int cfag12864bfb_probe(struct platform_device *device) 84 { 85 int ret = -EINVAL; 86 struct fb_info *info = framebuffer_alloc(0, &device->dev); 87 88 if (!info) 89 goto none; 90 91 info->screen_base = (char __iomem *) cfag12864b_buffer; 92 info->screen_size = CFAG12864B_SIZE; 93 info->fbops = &cfag12864bfb_ops; 94 info->fix = cfag12864bfb_fix; 95 info->var = cfag12864bfb_var; 96 info->pseudo_palette = NULL; 97 info->par = NULL; 98 info->flags = FBINFO_FLAG_DEFAULT; 99 100 if (register_framebuffer(info) < 0) 101 goto fballoced; 102 103 platform_set_drvdata(device, info); 104 105 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 106 info->fix.id); 107 108 return 0; 109 110 fballoced: 111 framebuffer_release(info); 112 113 none: 114 return ret; 115 } 116 117 static int cfag12864bfb_remove(struct platform_device *device) 118 { 119 struct fb_info *info = platform_get_drvdata(device); 120 121 if (info) { 122 unregister_framebuffer(info); 123 framebuffer_release(info); 124 } 125 126 return 0; 127 } 128 129 static struct platform_driver cfag12864bfb_driver = { 130 .probe = cfag12864bfb_probe, 131 .remove = cfag12864bfb_remove, 132 .driver = { 133 .name = CFAG12864BFB_NAME, 134 }, 135 }; 136 137 static struct platform_device *cfag12864bfb_device; 138 139 static int __init cfag12864bfb_init(void) 140 { 141 int ret = -EINVAL; 142 143 /* cfag12864b_init() must be called first */ 144 if (!cfag12864b_isinited()) { 145 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " 146 "cfag12864b is not initialized\n"); 147 goto none; 148 } 149 150 if (cfag12864b_enable()) { 151 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " 152 "can't enable cfag12864b refreshing (being used)\n"); 153 return -ENODEV; 154 } 155 156 ret = platform_driver_register(&cfag12864bfb_driver); 157 158 if (!ret) { 159 cfag12864bfb_device = 160 platform_device_alloc(CFAG12864BFB_NAME, 0); 161 162 if (cfag12864bfb_device) 163 ret = platform_device_add(cfag12864bfb_device); 164 else 165 ret = -ENOMEM; 166 167 if (ret) { 168 platform_device_put(cfag12864bfb_device); 169 platform_driver_unregister(&cfag12864bfb_driver); 170 } 171 } 172 173 none: 174 return ret; 175 } 176 177 static void __exit cfag12864bfb_exit(void) 178 { 179 platform_device_unregister(cfag12864bfb_device); 180 platform_driver_unregister(&cfag12864bfb_driver); 181 cfag12864b_disable(); 182 } 183 184 module_init(cfag12864bfb_init); 185 module_exit(cfag12864bfb_exit); 186 187 MODULE_LICENSE("GPL v2"); 188 MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>"); 189 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver"); 190