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 #include <linux/slab.h> 39 40 #include <asm/io.h> 41 42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 43 MODULE_DESCRIPTION("82C710 C&T mouse port chip driver"); 44 MODULE_LICENSE("GPL"); 45 46 /* 47 * ct82c710 interface 48 */ 49 50 #define CT82C710_DEV_IDLE 0x01 /* Device Idle */ 51 #define CT82C710_RX_FULL 0x02 /* Device Char received */ 52 #define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */ 53 #define CT82C710_RESET 0x08 /* Device Reset */ 54 #define CT82C710_INTS_ON 0x10 /* Device Interrupt On */ 55 #define CT82C710_ERROR_FLAG 0x20 /* Device Error */ 56 #define CT82C710_CLEAR 0x40 /* Device Clear */ 57 #define CT82C710_ENABLE 0x80 /* Device Enable */ 58 59 #define CT82C710_IRQ 12 60 61 #define CT82C710_DATA ct82c710_iores.start 62 #define CT82C710_STATUS (ct82c710_iores.start + 1) 63 64 static struct serio *ct82c710_port; 65 static struct platform_device *ct82c710_device; 66 static struct resource ct82c710_iores; 67 68 /* 69 * Interrupt handler for the 82C710 mouse port. A character 70 * is waiting in the 82C710. 71 */ 72 73 static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id) 74 { 75 return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0); 76 } 77 78 /* 79 * Wait for device to send output char and flush any input char. 80 */ 81 82 static int ct82c170_wait(void) 83 { 84 int timeout = 60000; 85 86 while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE)) 87 != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) { 88 89 if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA); 90 91 udelay(1); 92 timeout--; 93 } 94 95 return !timeout; 96 } 97 98 static void ct82c710_close(struct serio *serio) 99 { 100 if (ct82c170_wait()) 101 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); 102 103 outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS); 104 105 if (ct82c170_wait()) 106 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n"); 107 108 free_irq(CT82C710_IRQ, NULL); 109 } 110 111 static int ct82c710_open(struct serio *serio) 112 { 113 unsigned char status; 114 int err; 115 116 err = request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL); 117 if (err) 118 return err; 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 -EBUSY; 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_detect(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 -ENODEV; /* 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 int ct82c710_probe(struct platform_device *dev) 179 { 180 ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL); 181 if (!ct82c710_port) 182 return -ENOMEM; 183 184 ct82c710_port->id.type = SERIO_8042; 185 ct82c710_port->dev.parent = &dev->dev; 186 ct82c710_port->open = ct82c710_open; 187 ct82c710_port->close = ct82c710_close; 188 ct82c710_port->write = ct82c710_write; 189 strlcpy(ct82c710_port->name, "C&T 82c710 mouse port", 190 sizeof(ct82c710_port->name)); 191 snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys), 192 "isa%16llx/serio0", (unsigned long long)CT82C710_DATA); 193 194 serio_register_port(ct82c710_port); 195 196 printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n", 197 (unsigned long long)CT82C710_DATA, CT82C710_IRQ); 198 199 return 0; 200 } 201 202 static int ct82c710_remove(struct platform_device *dev) 203 { 204 serio_unregister_port(ct82c710_port); 205 206 return 0; 207 } 208 209 static struct platform_driver ct82c710_driver = { 210 .driver = { 211 .name = "ct82c710", 212 }, 213 .probe = ct82c710_probe, 214 .remove = ct82c710_remove, 215 }; 216 217 218 static int __init ct82c710_init(void) 219 { 220 int error; 221 222 error = ct82c710_detect(); 223 if (error) 224 return error; 225 226 error = platform_driver_register(&ct82c710_driver); 227 if (error) 228 return error; 229 230 ct82c710_device = platform_device_alloc("ct82c710", -1); 231 if (!ct82c710_device) { 232 error = -ENOMEM; 233 goto err_unregister_driver; 234 } 235 236 error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1); 237 if (error) 238 goto err_free_device; 239 240 error = platform_device_add(ct82c710_device); 241 if (error) 242 goto err_free_device; 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