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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
48MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
49MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
50MODULE_LICENSE("GPL");
51
52static unsigned int mk712_io = 0x260;
53module_param_named(io, mk712_io, uint, 0);
54MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
55
56static unsigned int mk712_irq = 10;
57module_param_named(irq, mk712_irq, uint, 0);
58MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
59
60
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
68#define MK712_STATUS_TOUCH 0x10
69#define MK712_CONVERSION_COMPLETE 0x80
70
71
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
79static struct input_dev *mk712_dev;
80static DEFINE_SPINLOCK(mk712_lock);
81
82static 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
121static 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);
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);
135
136 spin_unlock_irqrestore(&mk712_lock, flags);
137
138 return 0;
139}
140
141static 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
152static 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) ||
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
211static 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
218module_init(mk712_init);
219module_exit(mk712_exit);
220
