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.idt.com/products/getDoc.cfm?docID=18713923
  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/kernel.h>
  40 #include <linux/init.h>
  41 #include <linux/errno.h>
  42 #include <linux/delay.h>
  43 #include <linux/ioport.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/input.h>
  46 #include <asm/io.h>
  47
  48 MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
  49 MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
  50 MODULE_LICENSE("GPL");
  51
  52 static unsigned int mk712_io = 0x260;   /* Also 0x200, 0x208, 0x300 */
  53 module_param_named(io, mk712_io, uint, 0);
  54 MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
  55
  56 static unsigned int mk712_irq = 10;     /* Also 12, 14, 15 */
  57 module_param_named(irq, mk712_irq, uint, 0);
  58 MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
  59
  60 /* eight 8-bit registers */
  61 #define MK712_STATUS            0
  62 #define MK712_X                 2
  63 #define MK712_Y                 4
  64 #define MK712_CONTROL           6
  65 #define MK712_RATE              7
  66
  67 /* status */
  68 #define MK712_STATUS_TOUCH                      0x10
  69 #define MK712_CONVERSION_COMPLETE               0x80
  70
  71 /* control */
  72 #define MK712_ENABLE_INT                        0x01
  73 #define MK712_INT_ON_CONVERSION_COMPLETE        0x02
  74 #define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS     0x04
  75 #define MK712_ENABLE_PERIODIC_CONVERSIONS       0x10
  76 #define MK712_READ_ONE_POINT                    0x20
  77 #define MK712_POWERUP                           0x40
  78
  79 static struct input_dev *mk712_dev;
  80 static DEFINE_SPINLOCK(mk712_lock);
  81
  82 static irqreturn_t mk712_interrupt(int irq, void *dev_id)
  83 {
  84         unsigned char status;
  85         static int debounce = 1;
  86         static unsigned short last_x;
  87         static unsigned short last_y;
  88
  89         spin_lock(&mk712_lock);
  90
  91         status = inb(mk712_io + MK712_STATUS);
  92
  93         if (~status & MK712_CONVERSION_COMPLETE) {
  94                 debounce = 1;
  95                 goto end;
  96         }
  97
  98         if (~status & MK712_STATUS_TOUCH) {
  99                 debounce = 1;
 100                 input_report_key(mk712_dev, BTN_TOUCH, 0);
 101                 goto end;
 102         }
 103
 104         if (debounce) {
 105                 debounce = 0;
 106                 goto end;
 107         }
 108
 109         input_report_key(mk712_dev, BTN_TOUCH, 1);
 110         input_report_abs(mk712_dev, ABS_X, last_x);
 111         input_report_abs(mk712_dev, ABS_Y, last_y);
 112
 113  end:
 114         last_x = inw(mk712_io + MK712_X) & 0x0fff;
 115         last_y = inw(mk712_io + MK712_Y) & 0x0fff;
 116         input_sync(mk712_dev);
 117         spin_unlock(&mk712_lock);
 118         return IRQ_HANDLED;
 119 }
 120
 121 static int mk712_open(struct input_dev *dev)
 122 {
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&mk712_lock, flags);
 126
 127         outb(0, mk712_io + MK712_CONTROL); /* Reset */
 128
 129         outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE |
 130                 MK712_INT_ON_CHANGE_IN_TOUCH_STATUS |
 131                 MK712_ENABLE_PERIODIC_CONVERSIONS |
 132                 MK712_POWERUP, mk712_io + MK712_CONTROL);
 133
 134         outb(10, mk712_io + MK712_RATE); /* 187 points per second */
 135
 136         spin_unlock_irqrestore(&mk712_lock, flags);
 137
 138         return 0;
 139 }
 140
 141 static void mk712_close(struct input_dev *dev)
 142 {
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&mk712_lock, flags);
 146
 147         outb(0, mk712_io + MK712_CONTROL);
 148
 149         spin_unlock_irqrestore(&mk712_lock, flags);
 150 }
 151
 152 static int __init mk712_init(void)
 153 {
 154         int err;
 155
 156         if (!request_region(mk712_io, 8, "mk712")) {
 157                 printk(KERN_WARNING "mk712: unable to get IO region\n");
 158                 return -ENODEV;
 159         }
 160
 161         outb(0, mk712_io + MK712_CONTROL);
 162
 163         if ((inw(mk712_io + MK712_X) & 0xf000) ||       /* Sanity check */
 164             (inw(mk712_io + MK712_Y) & 0xf000) ||
 165             (inw(mk712_io + MK712_STATUS) & 0xf333)) {
 166                 printk(KERN_WARNING "mk712: device not present\n");
 167                 err = -ENODEV;
 168                 goto fail1;
 169         }
 170
 171         mk712_dev = input_allocate_device();
 172         if (!mk712_dev) {
 173                 printk(KERN_ERR "mk712: not enough memory\n");
 174                 err = -ENOMEM;
 175                 goto fail1;
 176         }
 177
 178         mk712_dev->name = "ICS MicroClock MK712 TouchScreen";
 179         mk712_dev->phys = "isa0260/input0";
 180         mk712_dev->id.bustype = BUS_ISA;
 181         mk712_dev->id.vendor  = 0x0005;
 182         mk712_dev->id.product = 0x0001;
 183         mk712_dev->id.version = 0x0100;
 184
 185         mk712_dev->open    = mk712_open;
 186         mk712_dev->close   = mk712_close;
 187
 188         mk712_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 189         mk712_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 190         input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);
 191         input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);
 192
 193         if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) {
 194                 printk(KERN_WARNING "mk712: unable to get IRQ\n");
 195                 err = -EBUSY;
 196                 goto fail1;
 197         }
 198
 199         err = input_register_device(mk712_dev);
 200         if (err)
 201                 goto fail2;
 202
 203         return 0;
 204
 205  fail2: free_irq(mk712_irq, mk712_dev);
 206  fail1: input_free_device(mk712_dev);
 207         release_region(mk712_io, 8);
 208         return err;
 209 }
 210
 211 static void __exit mk712_exit(void)
 212 {
 213         input_unregister_device(mk712_dev);
 214         free_irq(mk712_irq, mk712_dev);
 215         release_region(mk712_io, 8);
 216 }
 217
 218 module_init(mk712_init);
 219 module_exit(mk712_exit);