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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 |
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