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