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
  41 #include <asm/io.h>
  42
  43 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  44 MODULE_DESCRIPTION("82C710 C&T mouse port chip driver");
  45 MODULE_LICENSE("GPL");
  46
  47 /*
  48  * ct82c710 interface
  49  */
  50
  51 #define CT82C710_DEV_IDLE     0x01              /* Device Idle */
  52 #define CT82C710_RX_FULL      0x02              /* Device Char received */
  53 #define CT82C710_TX_IDLE      0x04              /* Device XMIT Idle */
  54 #define CT82C710_RESET        0x08              /* Device Reset */
  55 #define CT82C710_INTS_ON      0x10              /* Device Interrupt On */
  56 #define CT82C710_ERROR_FLAG   0x20              /* Device Error */
  57 #define CT82C710_CLEAR        0x40              /* Device Clear */
  58 #define CT82C710_ENABLE       0x80              /* Device Enable */
  59
  60 #define CT82C710_IRQ          12
  61
  62 #define CT82C710_DATA         ct82c710_iores.start
  63 #define CT82C710_STATUS       (ct82c710_iores.start + 1)
  64
  65 static struct serio *ct82c710_port;
  66 static struct platform_device *ct82c710_device;
  67 static struct resource ct82c710_iores;
  68
  69 /*
  70  * Interrupt handler for the 82C710 mouse port. A character
  71  * is waiting in the 82C710.
  72  */
  73
  74 static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id, struct pt_regs * regs)
  75 {
  76         return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0, regs);
  77 }
  78
  79 /*
  80  * Wait for device to send output char and flush any input char.
  81  */
  82
  83 static int ct82c170_wait(void)
  84 {
  85         int timeout = 60000;
  86
  87         while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE))
  88                        != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) {
  89
  90                 if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA);
  91
  92                 udelay(1);
  93                 timeout--;
  94         }
  95
  96         return !timeout;
  97 }
  98
  99 static void ct82c710_close(struct serio *serio)
 100 {
 101         if (ct82c170_wait())
 102                 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
 103
 104         outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS);
 105
 106         if (ct82c170_wait())
 107                 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
 108
 109         free_irq(CT82C710_IRQ, NULL);
 110 }
 111
 112 static int ct82c710_open(struct serio *serio)
 113 {
 114         unsigned char status;
 115
 116         if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL))
 117                 return -1;
 118
 119         status = inb_p(CT82C710_STATUS);
 120
 121         status |= (CT82C710_ENABLE | CT82C710_RESET);
 122         outb_p(status, CT82C710_STATUS);
 123
 124         status &= ~(CT82C710_RESET);
 125         outb_p(status, CT82C710_STATUS);
 126
 127         status |= CT82C710_INTS_ON;
 128         outb_p(status, CT82C710_STATUS);        /* Enable interrupts */
 129
 130         while (ct82c170_wait()) {
 131                 printk(KERN_ERR "ct82c710: Device busy in open()\n");
 132                 status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON);
 133                 outb_p(status, CT82C710_STATUS);
 134                 free_irq(CT82C710_IRQ, NULL);
 135                 return -1;
 136         }
 137
 138         return 0;
 139 }
 140
 141 /*
 142  * Write to the 82C710 mouse device.
 143  */
 144
 145 static int ct82c710_write(struct serio *port, unsigned char c)
 146 {
 147         if (ct82c170_wait()) return -1;
 148         outb_p(c, CT82C710_DATA);
 149         return 0;
 150 }
 151
 152 /*
 153  * See if we can find a 82C710 device. Read mouse address.
 154  */
 155
 156 static int __init ct82c710_probe(void)
 157 {
 158         outb_p(0x55, 0x2fa);                            /* Any value except 9, ff or 36 */
 159         outb_p(0xaa, 0x3fa);                            /* Inverse of 55 */
 160         outb_p(0x36, 0x3fa);                            /* Address the chip */
 161         outb_p(0xe4, 0x3fa);                            /* 390/4; 390 = config address */
 162         outb_p(0x1b, 0x2fa);                            /* Inverse of e4 */
 163         outb_p(0x0f, 0x390);                            /* Write index */
 164         if (inb_p(0x391) != 0xe4)                       /* Config address found? */
 165                 return -1;                              /* No: no 82C710 here */
 166
 167         outb_p(0x0d, 0x390);                            /* Write index */
 168         ct82c710_iores.start = inb_p(0x391) << 2;       /* Get mouse I/O address */
 169         ct82c710_iores.end = ct82c710_iores.start + 1;
 170         ct82c710_iores.flags = IORESOURCE_IO;
 171         outb_p(0x0f, 0x390);
 172         outb_p(0x0f, 0x391);                            /* Close config mode */
 173
 174         return 0;
 175 }
 176
 177 static struct serio * __init ct82c710_allocate_port(void)
 178 {
 179         struct serio *serio;
 180
 181         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 182         if (serio) {
 183                 memset(serio, 0, sizeof(struct serio));
 184                 serio->id.type = SERIO_8042;
 185                 serio->open = ct82c710_open;
 186                 serio->close = ct82c710_close;
 187                 serio->write = ct82c710_write;
 188                 serio->dev.parent = &ct82c710_device->dev;
 189                 strlcpy(serio->name, "C&T 82c710 mouse port", sizeof(serio->name));
 190                 snprintf(serio->phys, sizeof(serio->phys), "isa%04lx/serio0", CT82C710_DATA);
 191         }
 192
 193         return serio;
 194 }
 195
 196 static int __init ct82c710_init(void)
 197 {
 198         if (ct82c710_probe())
 199                 return -ENODEV;
 200
 201         ct82c710_device = platform_device_register_simple("ct82c710", -1, &ct82c710_iores, 1);
 202         if (IS_ERR(ct82c710_device))
 203                 return PTR_ERR(ct82c710_device);
 204
 205         if (!(ct82c710_port = ct82c710_allocate_port())) {
 206                 platform_device_unregister(ct82c710_device);
 207                 return -ENOMEM;
 208         }
 209
 210         serio_register_port(ct82c710_port);
 211
 212         printk(KERN_INFO "serio: C&T 82c710 mouse port at %#lx irq %d\n",
 213                 CT82C710_DATA, CT82C710_IRQ);
 214
 215         return 0;
 216 }
 217
 218 static void __exit ct82c710_exit(void)
 219 {
 220         serio_unregister_port(ct82c710_port);
 221         platform_device_unregister(ct82c710_device);
 222 }
 223
 224 module_init(ct82c710_init);
 225 module_exit(ct82c710_exit);