1 /* 2 * Copyright (c) 1999-2001 Vojtech Pavlik 3 */ 4 5 /* 6 * 82C710 C&T mouse port chip driver for Linux 7 */ 8 9 /* 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 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 * Should you need to contact me, the author, you can do so either by 25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 27 */ 28 29 #include <linux/delay.h> 30 #include <linux/module.h> 31 #include <linux/ioport.h> 32 #include <linux/init.h> 33 #include <linux/interrupt.h> 34 #include <linux/serio.h> 35 #include <linux/errno.h> 36 #include <linux/err.h> 37 #include <linux/platform_device.h> 38 39 #include <asm/io.h> 40 41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 42 MODULE_DESCRIPTION("82C710 C&T mouse port chip driver"); 43 MODULE_LICENSE("GPL"); 44 45 /* 46 * ct82c710 interface 47 */ 48 49 #define CT82C710_DEV_IDLE 0x01 /* Device Idle */ 50 #define CT82C710_RX_FULL 0x02 /* Device Char received */ 51 #define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */ 52 #define CT82C710_RESET 0x08 /* Device Reset */ 53 #define CT82C710_INTS_ON 0x10 /* Device Interrupt On */ 54 #define CT82C710_ERROR_FLAG 0x20 /* Device Error */ 55 #define CT82C710_CLEAR 0x40 /* Device Clear */ 56 #define CT82C710_ENABLE 0x80 /* Device Enable */ 57 58 #define CT82C710_IRQ 12 59 60 #define CT82C710_DATA ct82c710_iores.start 61 #define CT82C710_STATUS (ct82c710_iores.start + 1) 62 63 static struct serio *ct82c710_port; 64 static struct platform_device *ct82c710_device; 65 static struct resource ct82c710_iores; 66 67 /* 68 * Interrupt handler for the 82C710 mouse port. A character 69 * is waiting in the 82C710. 70 */ 71 72 static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id) 73 { 74 return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0); 75 } 76 77 /* 78 * Wait for device to send output char and flush any input char. 79 */ 80 81 static int ct82c170_wait(void) 82 { 83 int timeout = 60000; 84 85 while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE)) 86 != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) { 87 88 if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA); 89 90 udelay(1); 91 timeout--; 92 } 93 94 return !timeout; 95 } 96 97 static void ct82c710_close(struct serio *serio) 98 { 99 if (ct82c170_wait()) 100 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); 101 102 outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS); 103 104 if (ct82c170_wait()) 105 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); 106 107 free_irq(CT82C710_IRQ, NULL); 108 } 109 110 static int ct82c710_open(struct serio *serio) 111 { 112 unsigned char status; 113 114 if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL)) 115 return -1; 116 117 status = inb_p(CT82C710_STATUS); 118 119 status |= (CT82C710_ENABLE | CT82C710_RESET); 120 outb_p(status, CT82C710_STATUS); 121 122 status &= ~(CT82C710_RESET); 123 outb_p(status, CT82C710_STATUS); 124 125 status |= CT82C710_INTS_ON; 126 outb_p(status, CT82C710_STATUS); /* Enable interrupts */ 127 128 while (ct82c170_wait()) { 129 printk(KERN_ERR "ct82c710: Device busy in open()\n"); 130 status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON); 131 outb_p(status, CT82C710_STATUS); 132 free_irq(CT82C710_IRQ, NULL); 133 return -1; 134 } 135 136 return 0; 137 } 138 139 /* 140 * Write to the 82C710 mouse device. 141 */ 142 143 static int ct82c710_write(struct serio *port, unsigned char c) 144 { 145 if (ct82c170_wait()) return -1; 146 outb_p(c, CT82C710_DATA); 147 return 0; 148 } 149 150 /* 151 * See if we can find a 82C710 device. Read mouse address. 152 */ 153 154 static int __init ct82c710_detect(void) 155 { 156 outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */ 157 outb_p(0xaa, 0x3fa); /* Inverse of 55 */ 158 outb_p(0x36, 0x3fa); /* Address the chip */ 159 outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */ 160 outb_p(0x1b, 0x2fa); /* Inverse of e4 */ 161 outb_p(0x0f, 0x390); /* Write index */ 162 if (inb_p(0x391) != 0xe4) /* Config address found? */ 163 return -ENODEV; /* No: no 82C710 here */ 164 165 outb_p(0x0d, 0x390); /* Write index */ 166 ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */ 167 ct82c710_iores.end = ct82c710_iores.start + 1; 168 ct82c710_iores.flags = IORESOURCE_IO; 169 outb_p(0x0f, 0x390); 170 outb_p(0x0f, 0x391); /* Close config mode */ 171 172 return 0; 173 } 174 175 static int __devinit ct82c710_probe(struct platform_device *dev) 176 { 177 ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL); 178 if (!ct82c710_port) 179 return -ENOMEM; 180 181 ct82c710_port->id.type = SERIO_8042; 182 ct82c710_port->dev.parent = &dev->dev; 183 ct82c710_port->open = ct82c710_open; 184 ct82c710_port->close = ct82c710_close; 185 ct82c710_port->write = ct82c710_write; 186 strlcpy(ct82c710_port->name, "C&T 82c710 mouse port", 187 sizeof(ct82c710_port->name)); 188 snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys), 189 "isa%16llx/serio0", (unsigned long long)CT82C710_DATA); 190 191 serio_register_port(ct82c710_port); 192 193 return 0; 194 } 195 196 static int __devexit ct82c710_remove(struct platform_device *dev) 197 { 198 serio_unregister_port(ct82c710_port); 199 200 return 0; 201 } 202 203 static struct platform_driver ct82c710_driver = { 204 .driver = { 205 .name = "ct82c710", 206 .owner = THIS_MODULE, 207 }, 208 .probe = ct82c710_probe, 209 .remove = __devexit_p(ct82c710_remove), 210 }; 211 212 213 static int __init ct82c710_init(void) 214 { 215 int error; 216 217 error = ct82c710_detect(); 218 if (error) 219 return error; 220 221 error = platform_driver_register(&ct82c710_driver); 222 if (error) 223 return error; 224 225 ct82c710_device = platform_device_alloc("ct82c710", -1); 226 if (!ct82c710_device) { 227 error = -ENOMEM; 228 goto err_unregister_driver; 229 } 230 231 error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1); 232 if (error) 233 goto err_free_device; 234 235 error = platform_device_add(ct82c710_device); 236 if (error) 237 goto err_free_device; 238 239 serio_register_port(ct82c710_port); 240 241 printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n", 242 (unsigned long long)CT82C710_DATA, CT82C710_IRQ); 243 244 return 0; 245 246 err_free_device: 247 platform_device_put(ct82c710_device); 248 err_unregister_driver: 249 platform_driver_unregister(&ct82c710_driver); 250 return error; 251 } 252 253 static void __exit ct82c710_exit(void) 254 { 255 platform_device_unregister(ct82c710_device); 256 platform_driver_unregister(&ct82c710_driver); 257 } 258 259 module_init(ct82c710_init); 260 module_exit(ct82c710_exit); 261