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