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 debounce = 1; 101 input_report_key(mk712_dev, BTN_TOUCH, 0); 102 goto end; 103 } 104 105 if (debounce) { 106 debounce = 0; 107 goto end; 108 } 109 110 input_report_key(mk712_dev, BTN_TOUCH, 1); 111 input_report_abs(mk712_dev, ABS_X, last_x); 112 input_report_abs(mk712_dev, ABS_Y, last_y); 113 114 end: 115 last_x = inw(mk712_io + MK712_X) & 0x0fff; 116 last_y = inw(mk712_io + MK712_Y) & 0x0fff; 117 input_sync(mk712_dev); 118 spin_unlock(&mk712_lock); 119 return IRQ_HANDLED; 120 } 121 122 static int mk712_open(struct input_dev *dev) 123 { 124 unsigned long flags; 125 126 spin_lock_irqsave(&mk712_lock, flags); 127 128 outb(0, mk712_io + MK712_CONTROL); /* Reset */ 129 130 outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE | 131 MK712_INT_ON_CHANGE_IN_TOUCH_STATUS | 132 MK712_ENABLE_PERIODIC_CONVERSIONS | 133 MK712_POWERUP, mk712_io + MK712_CONTROL); 134 135 outb(10, mk712_io + MK712_RATE); /* 187 points per second */ 136 137 spin_unlock_irqrestore(&mk712_lock, flags); 138 139 return 0; 140 } 141 142 static void mk712_close(struct input_dev *dev) 143 { 144 unsigned long flags; 145 146 spin_lock_irqsave(&mk712_lock, flags); 147 148 outb(0, mk712_io + MK712_CONTROL); 149 150 spin_unlock_irqrestore(&mk712_lock, flags); 151 } 152 153 static int __init mk712_init(void) 154 { 155 int err; 156 157 if (!request_region(mk712_io, 8, "mk712")) { 158 printk(KERN_WARNING "mk712: unable to get IO region\n"); 159 return -ENODEV; 160 } 161 162 outb(0, mk712_io + MK712_CONTROL); 163 164 if ((inw(mk712_io + MK712_X) & 0xf000) || /* Sanity check */ 165 (inw(mk712_io + MK712_Y) & 0xf000) || 166 (inw(mk712_io + MK712_STATUS) & 0xf333)) { 167 printk(KERN_WARNING "mk712: device not present\n"); 168 err = -ENODEV; 169 goto fail1; 170 } 171 172 mk712_dev = input_allocate_device(); 173 if (!mk712_dev) { 174 printk(KERN_ERR "mk712: not enough memory\n"); 175 err = -ENOMEM; 176 goto fail1; 177 } 178 179 mk712_dev->name = "ICS MicroClock MK712 TouchScreen"; 180 mk712_dev->phys = "isa0260/input0"; 181 mk712_dev->id.bustype = BUS_ISA; 182 mk712_dev->id.vendor = 0x0005; 183 mk712_dev->id.product = 0x0001; 184 mk712_dev->id.version = 0x0100; 185 186 mk712_dev->open = mk712_open; 187 mk712_dev->close = mk712_close; 188 189 mk712_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 190 mk712_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); 191 input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0); 192 input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0); 193 194 if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) { 195 printk(KERN_WARNING "mk712: unable to get IRQ\n"); 196 err = -EBUSY; 197 goto fail1; 198 } 199 200 err = input_register_device(mk712_dev); 201 if (err) 202 goto fail2; 203 204 return 0; 205 206 fail2: free_irq(mk712_irq, mk712_dev); 207 fail1: input_free_device(mk712_dev); 208 release_region(mk712_io, 8); 209 return err; 210 } 211 212 static void __exit mk712_exit(void) 213 { 214 input_unregister_device(mk712_dev); 215 free_irq(mk712_irq, mk712_dev); 216 release_region(mk712_io, 8); 217 } 218 219 module_init(mk712_init); 220 module_exit(mk712_exit); 221