drivers/input/touchscreen/mk712.c

   1 /*
   2  * ICS MK712 touchscreen controller driver
   3  *
   4  * Copyright (c) 1999-2002 Transmeta Corporation
   5  * Copyright (c) 2005 Rick Koch <n1gp@hotmail.com>
   6  * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  */
  14
  15 /*
  16  * This driver supports the ICS MicroClock MK712 TouchScreen controller,
  17  * found in Gateway AOL Connected Touchpad computers.
  18  *
  19  * Documentation for ICS MK712 can be found at:
  20  *      http://www.icst.com/pdf/mk712.pdf
  21  */
  22
  23 /*
  24  * 1999-12-18: original version, Daniel Quinlan
  25  * 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll
  26  *             to use queue_empty, Nathan Laredo
  27  * 1999-12-20: improved random point rejection, Nathan Laredo
  28  * 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed
  29  *             queue code, added module options, other fixes, Daniel Quinlan
  30  * 2002-03-15: Clean up for kernel merge <alan@redhat.com>
  31  *             Fixed multi open race, fixed memory checks, fixed resource
  32  *             allocation, fixed close/powerdown bug, switched to new init
  33  * 2005-01-18: Ported to 2.6 from 2.4.28, Rick Koch
  34  * 2005-02-05: Rewritten for the input layer, Vojtech Pavlik
  35  *
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/kernel.h>
  41 #include <linux/init.h>
  42 #include <linux/errno.h>
  43 #include <linux/delay.h>
  44 #include <linux/ioport.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/input.h>
  47 #include <asm/io.h>
  48
  49 MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
  50 MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
  51 MODULE_LICENSE("GPL");
  52
  53 static unsigned int mk712_io = 0x260;   /* Also 0x200, 0x208, 0x300 */
  54 module_param_named(io, mk712_io, uint, 0);
  55 MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
  56
  57 static unsigned int mk712_irq = 10;     /* Also 12, 14, 15 */
  58 module_param_named(irq, mk712_irq, uint, 0);
  59 MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
  60
  61 /* eight 8-bit registers */
  62 #define MK712_STATUS            0
  63 #define MK712_X                 2
  64 #define MK712_Y                 4
  65 #define MK712_CONTROL           6
  66 #define MK712_RATE              7
  67
  68 /* status */
  69 #define MK712_STATUS_TOUCH                      0x10
  70 #define MK712_CONVERSION_COMPLETE               0x80
  71
  72 /* control */
  73 #define MK712_ENABLE_INT                        0x01
  74 #define MK712_INT_ON_CONVERSION_COMPLETE        0x02
  75 #define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS     0x04
  76 #define MK712_ENABLE_PERIODIC_CONVERSIONS       0x10
  77 #define MK712_READ_ONE_POINT                    0x20
  78 #define MK712_POWERUP                           0x40
  79
  80 static int mk712_used = 0;
  81 static struct input_dev mk712_dev;
  82 static DEFINE_SPINLOCK(mk712_lock);
  83
  84 static irqreturn_t mk712_interrupt(int irq, void *dev_id, struct pt_regs *regs)
  85 {
  86         unsigned char status;
  87         static int debounce = 1;
  88         static unsigned short last_x;
  89         static unsigned short last_y;
  90
  91         spin_lock(&mk712_lock);
  92         input_regs(&mk712_dev, regs);
  93
  94         status = inb(mk712_io + MK712_STATUS);
  95
  96         if (~status & MK712_CONVERSION_COMPLETE) {
  97                 debounce = 1;
  98                 goto end;
  99         }
 100
 101         if (~status & MK712_STATUS_TOUCH)
 102         {
 103                 debounce = 1;
 104                 input_report_key(&mk712_dev, BTN_TOUCH, 0);
 105                 goto end;
 106         }
 107
 108         if (debounce)
 109         {
 110                 debounce = 0;
 111                 goto end;
 112         }
 113
 114         input_report_key(&mk712_dev, BTN_TOUCH, 1);
 115         input_report_abs(&mk712_dev, ABS_X, last_x);
 116         input_report_abs(&mk712_dev, ABS_Y, last_y);
 117
 118 end:
 119
 120         last_x = inw(mk712_io + MK712_X) & 0x0fff;
 121         last_y = inw(mk712_io + MK712_Y) & 0x0fff;
 122         input_sync(&mk712_dev);
 123         spin_unlock(&mk712_lock);
 124         return IRQ_HANDLED;
 125 }
 126
 127 static int mk712_open(struct input_dev *dev)
 128 {
 129         unsigned long flags;
 130
 131         spin_lock_irqsave(&mk712_lock, flags);
 132
 133         if (!mk712_used++) {
 134
 135                 outb(0, mk712_io + MK712_CONTROL); /* Reset */
 136
 137                 outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE |
 138                         MK712_INT_ON_CHANGE_IN_TOUCH_STATUS |
 139                         MK712_ENABLE_PERIODIC_CONVERSIONS |
 140                         MK712_POWERUP, mk712_io + MK712_CONTROL);
 141
 142                 outb(10, mk712_io + MK712_RATE); /* 187 points per second */
 143         }
 144
 145         spin_unlock_irqrestore(&mk712_lock, flags);
 146
 147         return 0;
 148 }
 149
 150 static void mk712_close(struct input_dev *dev)
 151 {
 152         unsigned long flags;
 153
 154         spin_lock_irqsave(&mk712_lock, flags);
 155
 156         if (!--mk712_used)
 157                 outb(0, mk712_io + MK712_CONTROL);
 158
 159         spin_unlock_irqrestore(&mk712_lock, flags);
 160 }
 161
 162 static struct input_dev mk712_dev = {
 163         .evbit   = { BIT(EV_KEY) | BIT(EV_ABS) },
 164         .keybit  = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 165         .absbit  = { BIT(ABS_X) | BIT(ABS_Y) },
 166         .open    = mk712_open,
 167         .close   = mk712_close,
 168         .name    = "ICS MicroClock MK712 TouchScreen",
 169         .phys    = "isa0260/input0",
 170         .absmin  = { [ABS_X] = 0, [ABS_Y] = 0 },
 171         .absmax  = { [ABS_X] = 0xfff, [ABS_Y] = 0xfff },
 172         .absfuzz = { [ABS_X] = 88, [ABS_Y] = 88 },
 173         .id      = {
 174                 .bustype = BUS_ISA,
 175                 .vendor  = 0x0005,
 176                 .product = 0x0001,
 177                 .version = 0x0100,
 178         },
 179 };
 180
 181 int __init mk712_init(void)
 182 {
 183
 184         if(!request_region(mk712_io, 8, "mk712"))
 185         {
 186                 printk(KERN_WARNING "mk712: unable to get IO region\n");
 187                 return -ENODEV;
 188         }
 189
 190         outb(0, mk712_io + MK712_CONTROL);
 191
 192         if ((inw(mk712_io + MK712_X) & 0xf000) ||       /* Sanity check */
 193             (inw(mk712_io + MK712_Y) & 0xf000) ||
 194             (inw(mk712_io + MK712_STATUS) & 0xf333)) {
 195                 printk(KERN_WARNING "mk712: device not present\n");
 196                 release_region(mk712_io, 8);
 197                 return -ENODEV;
 198         }
 199
 200         if(request_irq(mk712_irq, mk712_interrupt, 0, "mk712", &mk712_dev))
 201         {
 202                 printk(KERN_WARNING "mk712: unable to get IRQ\n");
 203                 release_region(mk712_io, 8);
 204                 return -EBUSY;
 205         }
 206
 207         input_register_device(&mk712_dev);
 208
 209         printk(KERN_INFO "input: ICS MicroClock MK712 TouchScreen at %#x irq %d\n", mk712_io, mk712_irq);
 210
 211         return 0;
 212 }
 213
 214 static void __exit mk712_exit(void)
 215 {
 216         input_unregister_device(&mk712_dev);
 217         free_irq(mk712_irq, &mk712_dev);
 218         release_region(mk712_io, 8);
 219 }
 220
 221 module_init(mk712_init);
 222 module_exit(mk712_exit);