drivers/input/serio/ct82c710.c

   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);