fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / input / touchscreen / mk712.c
blob44140feeffc503428a54399b591f1628f3842010
1 /*
2 * ICS MK712 touchscreen controller driver
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 */
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.
16 * This driver supports the ICS MicroClock MK712 TouchScreen controller,
17 * found in Gateway AOL Connected Touchpad computers.
19 * Documentation for ICS MK712 can be found at:
20 * http://www.icst.com/pdf/mk712.pdf
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
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>
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");
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");
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");
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
68 /* status */
69 #define MK712_STATUS_TOUCH 0x10
70 #define MK712_CONVERSION_COMPLETE 0x80
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
80 static struct input_dev *mk712_dev;
81 static DEFINE_SPINLOCK(mk712_lock);
83 static irqreturn_t mk712_interrupt(int irq, void *dev_id)
85 unsigned char status;
86 static int debounce = 1;
87 static unsigned short last_x;
88 static unsigned short last_y;
90 spin_lock(&mk712_lock);
92 status = inb(mk712_io + MK712_STATUS);
94 if (~status & MK712_CONVERSION_COMPLETE) {
95 debounce = 1;
96 goto end;
99 if (~status & MK712_STATUS_TOUCH) {
100 debounce = 1;
101 input_report_key(mk712_dev, BTN_TOUCH, 0);
102 goto end;
105 if (debounce) {
106 debounce = 0;
107 goto end;
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);
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;
122 static int mk712_open(struct input_dev *dev)
124 unsigned long flags;
126 spin_lock_irqsave(&mk712_lock, flags);
128 outb(0, mk712_io + MK712_CONTROL); /* Reset */
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);
135 outb(10, mk712_io + MK712_RATE); /* 187 points per second */
137 spin_unlock_irqrestore(&mk712_lock, flags);
139 return 0;
142 static void mk712_close(struct input_dev *dev)
144 unsigned long flags;
146 spin_lock_irqsave(&mk712_lock, flags);
148 outb(0, mk712_io + MK712_CONTROL);
150 spin_unlock_irqrestore(&mk712_lock, flags);
153 static int __init mk712_init(void)
155 int err;
157 if (!request_region(mk712_io, 8, "mk712")) {
158 printk(KERN_WARNING "mk712: unable to get IO region\n");
159 return -ENODEV;
162 outb(0, mk712_io + MK712_CONTROL);
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;
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;
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;
186 mk712_dev->open = mk712_open;
187 mk712_dev->close = mk712_close;
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);
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;
200 err = input_register_device(mk712_dev);
201 if (err)
202 goto fail2;
204 return 0;
206 fail2: free_irq(mk712_irq, mk712_dev);
207 fail1: input_free_device(mk712_dev);
208 release_region(mk712_io, 8);
209 return err;
212 static void __exit mk712_exit(void)
214 input_unregister_device(mk712_dev);
215 free_irq(mk712_irq, mk712_dev);
216 release_region(mk712_io, 8);
219 module_init(mk712_init);
220 module_exit(mk712_exit);