1/* 2 * Drivers for the Total Impact PPC based computer "BRIQ" 3 * by Dr. Karsten Jeppesen 4 * 5 */ 6 7#include <linux/module.h> 8 9#include <linux/types.h> 10#include <linux/errno.h> 11#include <linux/tty.h> 12#include <linux/timer.h> 13#include <linux/kernel.h> 14#include <linux/wait.h> 15#include <linux/string.h> 16#include <linux/slab.h> 17#include <linux/ioport.h> 18#include <linux/delay.h> 19#include <linux/miscdevice.h> 20#include <linux/fs.h> 21#include <linux/mm.h> 22#include <linux/init.h> 23 24#include <asm/uaccess.h> 25#include <asm/io.h> 26#include <asm/prom.h> 27 28#define BRIQ_PANEL_MINOR 156 29#define BRIQ_PANEL_VFD_IOPORT 0x0390 30#define BRIQ_PANEL_LED_IOPORT 0x0398 31#define BRIQ_PANEL_VER "1.1 (04/20/2002)" 32#define BRIQ_PANEL_MSG0 "Loading Linux" 33 34static int vfd_is_open; 35static unsigned char vfd[40]; 36static int vfd_cursor; 37static unsigned char ledpb, led; 38 39static void update_vfd(void) 40{ 41 int i; 42 43 /* cursor home */ 44 outb(0x02, BRIQ_PANEL_VFD_IOPORT); 45 for (i=0; i<20; i++) 46 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1); 47 48 /* cursor to next line */ 49 outb(0xc0, BRIQ_PANEL_VFD_IOPORT); 50 for (i=20; i<40; i++) 51 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1); 52 53} 54 55static void set_led(char state) 56{ 57 if (state == 'R') 58 led = 0x01; 59 else if (state == 'G') 60 led = 0x02; 61 else if (state == 'Y') 62 led = 0x03; 63 else if (state == 'X') 64 led = 0x00; 65 outb(led, BRIQ_PANEL_LED_IOPORT); 66} 67 68static int briq_panel_open(struct inode *ino, struct file *filep) 69{ 70 /* enforce single access */ 71 if (vfd_is_open) 72 return -EBUSY; 73 vfd_is_open = 1; 74 75 return 0; 76} 77 78static int briq_panel_release(struct inode *ino, struct file *filep) 79{ 80 if (!vfd_is_open) 81 return -ENODEV; 82 83 vfd_is_open = 0; 84 85 return 0; 86} 87 88static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count, 89 loff_t *ppos) 90{ 91 unsigned short c; 92 unsigned char cp; 93 94 95 if (!vfd_is_open) 96 return -ENODEV; 97 98 c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003); 99 set_led(' '); 100 /* upper button released */ 101 if ((!(ledpb & 0x0004)) && (c & 0x0004)) { 102 cp = ' '; 103 ledpb = c; 104 if (copy_to_user(buf, &cp, 1)) 105 return -EFAULT; 106 return 1; 107 } 108 /* lower button released */ 109 else if ((!(ledpb & 0x0008)) && (c & 0x0008)) { 110 cp = '\r'; 111 ledpb = c; 112 if (copy_to_user(buf, &cp, 1)) 113 return -EFAULT; 114 return 1; 115 } else { 116 ledpb = c; 117 return 0; 118 } 119} 120 121static void scroll_vfd( void ) 122{ 123 int i; 124 125 for (i=0; i<20; i++) { 126 vfd[i] = vfd[i+20]; 127 vfd[i+20] = ' '; 128 } 129 vfd_cursor = 20; 130} 131 132static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len, 133 loff_t *ppos) 134{ 135 size_t indx = len; 136 int i, esc = 0; 137 138 139 if (!vfd_is_open) 140 return -EBUSY; 141 142 for (;;) { 143 char c; 144 if (!indx) 145 break; 146 if (get_user(c, buf)) 147 return -EFAULT; 148 if (esc) { 149 set_led(c); 150 esc = 0; 151 } else if (c == 27) { 152 esc = 1; 153 } else if (c == 12) { 154 /* do a form feed */ 155 for (i=0; i<40; i++) 156 vfd[i] = ' '; 157 vfd_cursor = 0; 158 } else if (c == 10) { 159 if (vfd_cursor < 20) 160 vfd_cursor = 20; 161 else if (vfd_cursor < 40) 162 vfd_cursor = 40; 163 else if (vfd_cursor < 60) 164 vfd_cursor = 60; 165 if (vfd_cursor > 59) 166 scroll_vfd(); 167 } else { 168 /* just a character */ 169 if (vfd_cursor > 39) 170 scroll_vfd(); 171 vfd[vfd_cursor++] = c; 172 } 173 indx--; 174 buf++; 175 } 176 update_vfd(); 177 178 return len; 179} 180 181static const struct file_operations briq_panel_fops = { 182 .owner = THIS_MODULE, 183 .read = briq_panel_read, 184 .write = briq_panel_write, 185 .open = briq_panel_open, 186 .release = briq_panel_release, 187}; 188 189static struct miscdevice briq_panel_miscdev = { 190 BRIQ_PANEL_MINOR, 191 "briq_panel", 192 &briq_panel_fops 193}; 194 195static int __init briq_panel_init(void) 196{ 197 struct device_node *root = of_find_node_by_path("/"); 198 const char *machine; 199 int i; 200 201 machine = of_get_property(root, "model", NULL); 202 if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) { 203 of_node_put(root); 204 return -ENODEV; 205 } 206 of_node_put(root); 207 208 printk(KERN_INFO 209 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n", 210 BRIQ_PANEL_VER); 211 212 if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel")) 213 return -EBUSY; 214 215 if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) { 216 release_region(BRIQ_PANEL_VFD_IOPORT, 4); 217 return -EBUSY; 218 } 219 ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c; 220 221 if (misc_register(&briq_panel_miscdev) < 0) { 222 release_region(BRIQ_PANEL_VFD_IOPORT, 4); 223 release_region(BRIQ_PANEL_LED_IOPORT, 2); 224 return -EBUSY; 225 } 226 227 outb(0x38, BRIQ_PANEL_VFD_IOPORT); /* Function set */ 228 outb(0x01, BRIQ_PANEL_VFD_IOPORT); /* Clear display */ 229 outb(0x0c, BRIQ_PANEL_VFD_IOPORT); /* Display on */ 230 outb(0x06, BRIQ_PANEL_VFD_IOPORT); /* Entry normal */ 231 for (i=0; i<40; i++) 232 vfd[i]=' '; 233#ifndef MODULE 234 vfd[0] = 'L'; 235 vfd[1] = 'o'; 236 vfd[2] = 'a'; 237 vfd[3] = 'd'; 238 vfd[4] = 'i'; 239 vfd[5] = 'n'; 240 vfd[6] = 'g'; 241 vfd[7] = ' '; 242 vfd[8] = '.'; 243 vfd[9] = '.'; 244 vfd[10] = '.'; 245#endif /* !MODULE */ 246 247 update_vfd(); 248 249 return 0; 250} 251 252static void __exit briq_panel_exit(void) 253{ 254 misc_deregister(&briq_panel_miscdev); 255 release_region(BRIQ_PANEL_VFD_IOPORT, 4); 256 release_region(BRIQ_PANEL_LED_IOPORT, 2); 257} 258 259module_init(briq_panel_init); 260module_exit(briq_panel_exit); 261 262MODULE_LICENSE("GPL"); 263MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>"); 264MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel"); 265