1 /* 2 * $Id: ct82c710.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $ 3 * 4 * Copyright (c) 1999-2001 Vojtech Pavlik 5 */ 6 7 /* 8 * 82C710 C&T mouse port chip driver for Linux 9 */ 10 11 /* 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * Should you need to contact me, the author, you can do so either by 27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 29 */ 30 31 #include <linux/delay.h> 32 #include <linux/module.h> 33 #include <linux/ioport.h> 34 #include <linux/config.h> 35 #include <linux/init.h> 36 #include <linux/interrupt.h> 37 #include <linux/serio.h> 38 #include <linux/errno.h> 39 #include <linux/err.h> 40 #include <linux/platform_device.h> 41 42 #include <asm/io.h> 43 44 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 45 MODULE_DESCRIPTION("82C710 C&T mouse port chip driver"); 46 MODULE_LICENSE("GPL"); 47 48 /* 49 * ct82c710 interface 50 */ 51 52 #define CT82C710_DEV_IDLE 0x01 /* Device Idle */ 53 #define CT82C710_RX_FULL 0x02 /* Device Char received */ 54 #define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */ 55 #define CT82C710_RESET 0x08 /* Device Reset */ 56 #define CT82C710_INTS_ON 0x10 /* Device Interrupt On */ 57 #define CT82C710_ERROR_FLAG 0x20 /* Device Error */ 58 #define CT82C710_CLEAR 0x40 /* Device Clear */ 59 #define CT82C710_ENABLE 0x80 /* Device Enable */ 60 61 #define CT82C710_IRQ 12 62 63 #define CT82C710_DATA ct82c710_iores.start 64 #define CT82C710_STATUS (ct82c710_iores.start + 1) 65 66 static struct serio *ct82c710_port; 67 static struct platform_device *ct82c710_device; 68 static struct resource ct82c710_iores; 69 70 /* 71 * Interrupt handler for the 82C710 mouse port. A character 72 * is waiting in the 82C710. 73 */ 74 75 static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id, struct pt_regs * regs) 76 { 77 return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0, regs); 78 } 79 80 /* 81 * Wait for device to send output char and flush any input char. 82 */ 83 84 static int ct82c170_wait(void) 85 { 86 int timeout = 60000; 87 88 while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE)) 89 != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) { 90 91 if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA); 92 93 udelay(1); 94 timeout--; 95 } 96 97 return !timeout; 98 } 99 100 static void ct82c710_close(struct serio *serio) 101 { 102 if (ct82c170_wait()) 103 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); 104 105 outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS); 106 107 if (ct82c170_wait()) 108 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); 109 110 free_irq(CT82C710_IRQ, NULL); 111 } 112 113 static int ct82c710_open(struct serio *serio) 114 { 115 unsigned char status; 116 117 if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL)) 118 return -1; 119 120 status = inb_p(CT82C710_STATUS); 121 122 status |= (CT82C710_ENABLE | CT82C710_RESET); 123 outb_p(status, CT82C710_STATUS); 124 125 status &= ~(CT82C710_RESET); 126 outb_p(status, CT82C710_STATUS); 127 128 status |= CT82C710_INTS_ON; 129 outb_p(status, CT82C710_STATUS); /* Enable interrupts */ 130 131 while (ct82c170_wait()) { 132 printk(KERN_ERR "ct82c710: Device busy in open()\n"); 133 status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON); 134 outb_p(status, CT82C710_STATUS); 135 free_irq(CT82C710_IRQ, NULL); 136 return -1; 137 } 138 139 return 0; 140 } 141 142 /* 143 * Write to the 82C710 mouse device. 144 */ 145 146 static int ct82c710_write(struct serio *port, unsigned char c) 147 { 148 if (ct82c170_wait()) return -1; 149 outb_p(c, CT82C710_DATA); 150 return 0; 151 } 152 153 /* 154 * See if we can find a 82C710 device. Read mouse address. 155 */ 156 157 static int __init ct82c710_probe(void) 158 { 159 outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */ 160 outb_p(0xaa, 0x3fa); /* Inverse of 55 */ 161 outb_p(0x36, 0x3fa); /* Address the chip */ 162 outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */ 163 outb_p(0x1b, 0x2fa); /* Inverse of e4 */ 164 outb_p(0x0f, 0x390); /* Write index */ 165 if (inb_p(0x391) != 0xe4) /* Config address found? */ 166 return -1; /* No: no 82C710 here */ 167 168 outb_p(0x0d, 0x390); /* Write index */ 169 ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */ 170 ct82c710_iores.end = ct82c710_iores.start + 1; 171 ct82c710_iores.flags = IORESOURCE_IO; 172 outb_p(0x0f, 0x390); 173 outb_p(0x0f, 0x391); /* Close config mode */ 174 175 return 0; 176 } 177 178 static struct serio * __init ct82c710_allocate_port(void) 179 { 180 struct serio *serio; 181 182 serio = kmalloc(sizeof(struct serio), GFP_KERNEL); 183 if (serio) { 184 memset(serio, 0, sizeof(struct serio)); 185 serio->id.type = SERIO_8042; 186 serio->open = ct82c710_open; 187 serio->close = ct82c710_close; 188 serio->write = ct82c710_write; 189 serio->dev.parent = &ct82c710_device->dev; 190 strlcpy(serio->name, "C&T 82c710 mouse port", sizeof(serio->name)); 191 snprintf(serio->phys, sizeof(serio->phys), "isa%04lx/serio0", CT82C710_DATA); 192 } 193 194 return serio; 195 } 196 197 static int __init ct82c710_init(void) 198 { 199 if (ct82c710_probe()) 200 return -ENODEV; 201 202 ct82c710_device = platform_device_register_simple("ct82c710", -1, &ct82c710_iores, 1); 203 if (IS_ERR(ct82c710_device)) 204 return PTR_ERR(ct82c710_device); 205 206 if (!(ct82c710_port = ct82c710_allocate_port())) { 207 platform_device_unregister(ct82c710_device); 208 return -ENOMEM; 209 } 210 211 serio_register_port(ct82c710_port); 212 213 printk(KERN_INFO "serio: C&T 82c710 mouse port at %#lx irq %d\n", 214 CT82C710_DATA, CT82C710_IRQ); 215 216 return 0; 217 } 218 219 static void __exit ct82c710_exit(void) 220 { 221 serio_unregister_port(ct82c710_port); 222 platform_device_unregister(ct82c710_device); 223 } 224 225 module_init(ct82c710_init); 226 module_exit(ct82c710_exit); 227