drivers/input/serio/ct82c710.c

   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);