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); 220