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1da177e4 LT |
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: | |
de1b963a | 20 | * http://www.icst.com/pdf/mk712.pdf |
1da177e4 LT |
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 | ||
eca1ed19 | 80 | static struct input_dev *mk712_dev; |
1da177e4 LT |
81 | static DEFINE_SPINLOCK(mk712_lock); |
82 | ||
7d12e780 | 83 | static irqreturn_t mk712_interrupt(int irq, void *dev_id) |
1da177e4 LT |
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); | |
1da177e4 LT |
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 | { | |
101 | debounce = 1; | |
eca1ed19 | 102 | input_report_key(mk712_dev, BTN_TOUCH, 0); |
1da177e4 LT |
103 | goto end; |
104 | } | |
105 | ||
106 | if (debounce) | |
107 | { | |
108 | debounce = 0; | |
109 | goto end; | |
110 | } | |
111 | ||
eca1ed19 DT |
112 | input_report_key(mk712_dev, BTN_TOUCH, 1); |
113 | input_report_abs(mk712_dev, ABS_X, last_x); | |
114 | input_report_abs(mk712_dev, ABS_Y, last_y); | |
1da177e4 LT |
115 | |
116 | end: | |
117 | ||
118 | last_x = inw(mk712_io + MK712_X) & 0x0fff; | |
119 | last_y = inw(mk712_io + MK712_Y) & 0x0fff; | |
eca1ed19 | 120 | input_sync(mk712_dev); |
1da177e4 LT |
121 | spin_unlock(&mk712_lock); |
122 | return IRQ_HANDLED; | |
123 | } | |
124 | ||
125 | static int mk712_open(struct input_dev *dev) | |
126 | { | |
127 | unsigned long flags; | |
128 | ||
129 | spin_lock_irqsave(&mk712_lock, flags); | |
130 | ||
af246041 | 131 | outb(0, mk712_io + MK712_CONTROL); /* Reset */ |
1da177e4 | 132 | |
af246041 DT |
133 | outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE | |
134 | MK712_INT_ON_CHANGE_IN_TOUCH_STATUS | | |
135 | MK712_ENABLE_PERIODIC_CONVERSIONS | | |
136 | MK712_POWERUP, mk712_io + MK712_CONTROL); | |
1da177e4 | 137 | |
af246041 | 138 | outb(10, mk712_io + MK712_RATE); /* 187 points per second */ |
1da177e4 LT |
139 | |
140 | spin_unlock_irqrestore(&mk712_lock, flags); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static void mk712_close(struct input_dev *dev) | |
146 | { | |
147 | unsigned long flags; | |
148 | ||
149 | spin_lock_irqsave(&mk712_lock, flags); | |
150 | ||
af246041 | 151 | outb(0, mk712_io + MK712_CONTROL); |
1da177e4 LT |
152 | |
153 | spin_unlock_irqrestore(&mk712_lock, flags); | |
154 | } | |
155 | ||
ffc6b529 | 156 | static int __init mk712_init(void) |
1da177e4 | 157 | { |
eca1ed19 | 158 | int err; |
1da177e4 | 159 | |
eca1ed19 | 160 | if (!request_region(mk712_io, 8, "mk712")) { |
1da177e4 LT |
161 | printk(KERN_WARNING "mk712: unable to get IO region\n"); |
162 | return -ENODEV; | |
163 | } | |
164 | ||
165 | outb(0, mk712_io + MK712_CONTROL); | |
166 | ||
167 | if ((inw(mk712_io + MK712_X) & 0xf000) || /* Sanity check */ | |
168 | (inw(mk712_io + MK712_Y) & 0xf000) || | |
169 | (inw(mk712_io + MK712_STATUS) & 0xf333)) { | |
170 | printk(KERN_WARNING "mk712: device not present\n"); | |
eca1ed19 DT |
171 | err = -ENODEV; |
172 | goto fail; | |
1da177e4 LT |
173 | } |
174 | ||
eca1ed19 DT |
175 | if (!(mk712_dev = input_allocate_device())) { |
176 | printk(KERN_ERR "mk712: not enough memory\n"); | |
177 | err = -ENOMEM; | |
178 | goto fail; | |
1da177e4 LT |
179 | } |
180 | ||
eca1ed19 DT |
181 | mk712_dev->name = "ICS MicroClock MK712 TouchScreen"; |
182 | mk712_dev->phys = "isa0260/input0"; | |
183 | mk712_dev->id.bustype = BUS_ISA; | |
184 | mk712_dev->id.vendor = 0x0005; | |
185 | mk712_dev->id.product = 0x0001; | |
186 | mk712_dev->id.version = 0x0100; | |
187 | ||
188 | mk712_dev->open = mk712_open; | |
189 | mk712_dev->close = mk712_close; | |
1da177e4 | 190 | |
eca1ed19 DT |
191 | mk712_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
192 | mk712_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); | |
193 | input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0); | |
194 | input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0); | |
1da177e4 | 195 | |
eca1ed19 DT |
196 | if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) { |
197 | printk(KERN_WARNING "mk712: unable to get IRQ\n"); | |
198 | err = -EBUSY; | |
199 | goto fail; | |
200 | } | |
201 | ||
202 | input_register_device(mk712_dev); | |
1da177e4 | 203 | return 0; |
eca1ed19 DT |
204 | |
205 | fail: input_free_device(mk712_dev); | |
206 | release_region(mk712_io, 8); | |
207 | return err; | |
1da177e4 LT |
208 | } |
209 | ||
210 | static void __exit mk712_exit(void) | |
211 | { | |
eca1ed19 DT |
212 | input_unregister_device(mk712_dev); |
213 | free_irq(mk712_irq, mk712_dev); | |
1da177e4 LT |
214 | release_region(mk712_io, 8); |
215 | } | |
216 | ||
217 | module_init(mk712_init); | |
218 | module_exit(mk712_exit); |