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 struct input_dev *mk712_dev;
  81 static DEFINE_SPINLOCK(mk712_lock);
  82
  83 static irqreturn_t mk712_interrupt(int irq, void *dev_id)
  84 {
  85         unsigned char status;
  86         static int debounce = 1;
  87         static unsigned short last_x;
  88         static unsigned short last_y;
  89
  90         spin_lock(&mk712_lock);
  91
  92         status = inb(mk712_io + MK712_STATUS);
  93
  94         if (~status & MK712_CONVERSION_COMPLETE) {
  95                 debounce = 1;
  96                 goto end;
  97         }
  98
  99         if (~status & MK712_STATUS_TOUCH)
 100         {
 101                 debounce = 1;
 102                 input_report_key(mk712_dev, BTN_TOUCH, 0);
 103                 goto end;
 104         }
 105
 106         if (debounce)
 107         {
 108                 debounce = 0;
 109                 goto end;
 110         }
 111
 112         input_report_key(mk712_dev, BTN_TOUCH, 1);
 113         input_report_abs(mk712_dev, ABS_X, last_x);
 114         input_report_abs(mk712_dev, ABS_Y, last_y);
 115
 116 end:
 117
 118         last_x = inw(mk712_io + MK712_X) & 0x0fff;
 119         last_y = inw(mk712_io + MK712_Y) & 0x0fff;
 120         input_sync(mk712_dev);
 121         spin_unlock(&mk712_lock);
 122         return IRQ_HANDLED;
 123 }
 124
 125 static int mk712_open(struct input_dev *dev)
 126 {
 127         unsigned long flags;
 128
 129         spin_lock_irqsave(&mk712_lock, flags);
 130
 131         outb(0, mk712_io + MK712_CONTROL); /* Reset */
 132
 133         outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE |
 134                 MK712_INT_ON_CHANGE_IN_TOUCH_STATUS |
 135                 MK712_ENABLE_PERIODIC_CONVERSIONS |
 136                 MK712_POWERUP, mk712_io + MK712_CONTROL);
 137
 138         outb(10, mk712_io + MK712_RATE); /* 187 points per second */
 139
 140         spin_unlock_irqrestore(&mk712_lock, flags);
 141
 142         return 0;
 143 }
 144
 145 static void mk712_close(struct input_dev *dev)
 146 {
 147         unsigned long flags;
 148
 149         spin_lock_irqsave(&mk712_lock, flags);
 150
 151         outb(0, mk712_io + MK712_CONTROL);
 152
 153         spin_unlock_irqrestore(&mk712_lock, flags);
 154 }
 155
 156 static int __init mk712_init(void)
 157 {
 158         int err;
 159
 160         if (!request_region(mk712_io, 8, "mk712")) {
 161                 printk(KERN_WARNING "mk712: unable to get IO region\n");
 162                 return -ENODEV;
 163         }
 164
 165         outb(0, mk712_io + MK712_CONTROL);
 166
 167         if ((inw(mk712_io + MK712_X) & 0xf000) ||       /* Sanity check */
 168             (inw(mk712_io + MK712_Y) & 0xf000) ||
 169             (inw(mk712_io + MK712_STATUS) & 0xf333)) {
 170                 printk(KERN_WARNING "mk712: device not present\n");
 171                 err = -ENODEV;
 172                 goto fail;
 173         }
 174
 175         if (!(mk712_dev = input_allocate_device())) {
 176                 printk(KERN_ERR "mk712: not enough memory\n");
 177                 err = -ENOMEM;
 178                 goto fail;
 179         }
 180
 181         mk712_dev->name = "ICS MicroClock MK712 TouchScreen";
 182         mk712_dev->phys = "isa0260/input0";
 183         mk712_dev->id.bustype = BUS_ISA;
 184         mk712_dev->id.vendor  = 0x0005;
 185         mk712_dev->id.product = 0x0001;
 186         mk712_dev->id.version = 0x0100;
 187
 188         mk712_dev->open    = mk712_open;
 189         mk712_dev->close   = mk712_close;
 190
 191         mk712_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 192         mk712_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 193         input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);
 194         input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);
 195
 196         if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) {
 197                 printk(KERN_WARNING "mk712: unable to get IRQ\n");
 198                 err = -EBUSY;
 199                 goto fail;
 200         }
 201
 202         input_register_device(mk712_dev);
 203         return 0;
 204
 205  fail:  input_free_device(mk712_dev);
 206         release_region(mk712_io, 8);
 207         return err;
 208 }
 209
 210 static void __exit mk712_exit(void)
 211 {
 212         input_unregister_device(mk712_dev);
 213         free_irq(mk712_irq, mk712_dev);
 214         release_region(mk712_io, 8);
 215 }
 216
 217 module_init(mk712_init);
 218 module_exit(mk712_exit);