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 <maxextreme@gmail.com> 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/slab.h> 35 #include <linux/string.h> 36 #include <linux/uaccess.h> 37 #include <linux/cfag12864b.h> 38 39 #define CFAG12864BFB_NAME "cfag12864bfb" 40 41 static struct fb_fix_screeninfo cfag12864bfb_fix __initdata = { 42 .id = "cfag12864b", 43 .type = FB_TYPE_PACKED_PIXELS, 44 .visual = FB_VISUAL_MONO10, 45 .xpanstep = 0, 46 .ypanstep = 0, 47 .ywrapstep = 0, 48 .line_length = CFAG12864B_WIDTH / 8, 49 .accel = FB_ACCEL_NONE, 50 }; 51 52 static struct fb_var_screeninfo cfag12864bfb_var __initdata = { 53 .xres = CFAG12864B_WIDTH, 54 .yres = CFAG12864B_HEIGHT, 55 .xres_virtual = CFAG12864B_WIDTH, 56 .yres_virtual = CFAG12864B_HEIGHT, 57 .bits_per_pixel = 1, 58 .red = { 0, 1, 0 }, 59 .green = { 0, 1, 0 }, 60 .blue = { 0, 1, 0 }, 61 .left_margin = 0, 62 .right_margin = 0, 63 .upper_margin = 0, 64 .lower_margin = 0, 65 .vmode = FB_VMODE_NONINTERLACED, 66 }; 67 68 static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma) 69 { 70 return vm_insert_page(vma, vma->vm_start, 71 virt_to_page(cfag12864b_buffer)); 72 } 73 74 static struct fb_ops cfag12864bfb_ops = { 75 .owner = THIS_MODULE, 76 .fb_read = fb_sys_read, 77 .fb_write = fb_sys_write, 78 .fb_fillrect = sys_fillrect, 79 .fb_copyarea = sys_copyarea, 80 .fb_imageblit = sys_imageblit, 81 .fb_mmap = cfag12864bfb_mmap, 82 }; 83 84 static int __init cfag12864bfb_probe(struct platform_device *device) 85 { 86 int ret = -EINVAL; 87 struct fb_info *info = framebuffer_alloc(0, &device->dev); 88 89 if (!info) 90 goto none; 91 92 info->screen_base = (char __iomem *) cfag12864b_buffer; 93 info->screen_size = CFAG12864B_SIZE; 94 info->fbops = &cfag12864bfb_ops; 95 info->fix = cfag12864bfb_fix; 96 info->var = cfag12864bfb_var; 97 info->pseudo_palette = NULL; 98 info->par = NULL; 99 info->flags = FBINFO_FLAG_DEFAULT; 100 101 if (register_framebuffer(info) < 0) 102 goto fballoced; 103 104 platform_set_drvdata(device, info); 105 106 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, 107 info->fix.id); 108 109 return 0; 110 111 fballoced: 112 framebuffer_release(info); 113 114 none: 115 return ret; 116 } 117 118 static int cfag12864bfb_remove(struct platform_device *device) 119 { 120 struct fb_info *info = platform_get_drvdata(device); 121 122 if (info) { 123 unregister_framebuffer(info); 124 framebuffer_release(info); 125 } 126 127 return 0; 128 } 129 130 static struct platform_driver cfag12864bfb_driver = { 131 .probe = cfag12864bfb_probe, 132 .remove = cfag12864bfb_remove, 133 .driver = { 134 .name = CFAG12864BFB_NAME, 135 }, 136 }; 137 138 static struct platform_device *cfag12864bfb_device; 139 140 static int __init cfag12864bfb_init(void) 141 { 142 int ret = -EINVAL; 143 144 /* cfag12864b_init() must be called first */ 145 if (!cfag12864b_isinited()) { 146 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " 147 "cfag12864b is not initialized\n"); 148 goto none; 149 } 150 151 if (cfag12864b_enable()) { 152 printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " 153 "can't enable cfag12864b refreshing (being used)\n"); 154 return -ENODEV; 155 } 156 157 ret = platform_driver_register(&cfag12864bfb_driver); 158 159 if (!ret) { 160 cfag12864bfb_device = 161 platform_device_alloc(CFAG12864BFB_NAME, 0); 162 163 if (cfag12864bfb_device) 164 ret = platform_device_add(cfag12864bfb_device); 165 else 166 ret = -ENOMEM; 167 168 if (ret) { 169 platform_device_put(cfag12864bfb_device); 170 platform_driver_unregister(&cfag12864bfb_driver); 171 } 172 } 173 174 none: 175 return ret; 176 } 177 178 static void __exit cfag12864bfb_exit(void) 179 { 180 platform_device_unregister(cfag12864bfb_device); 181 platform_driver_unregister(&cfag12864bfb_driver); 182 cfag12864b_disable(); 183 } 184 185 module_init(cfag12864bfb_init); 186 module_exit(cfag12864bfb_exit); 187 188 MODULE_LICENSE("GPL v2"); 189 MODULE_AUTHOR("Miguel Ojeda Sandonis <maxextreme@gmail.com>"); 190 MODULE_DESCRIPTION("cfag12864b LCD framebuffer driver"); 191