1 /*
2  * HTC Shift touchscreen driver
3  *
4  * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published
8  * by the Free Software Foundation.
9  */
10 
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/input.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/init.h>
18 #include <linux/irq.h>
19 #include <linux/isa.h>
20 #include <linux/ioport.h>
21 #include <linux/dmi.h>
22 
23 MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
24 MODULE_DESCRIPTION("HTC Shift touchscreen driver");
25 MODULE_LICENSE("GPL");
26 
27 #define HTCPEN_PORT_IRQ_CLEAR	0x068
28 #define HTCPEN_PORT_INIT	0x06c
29 #define HTCPEN_PORT_INDEX	0x0250
30 #define HTCPEN_PORT_DATA	0x0251
31 #define HTCPEN_IRQ		3
32 
33 #define DEVICE_ENABLE		0xa2
34 #define DEVICE_DISABLE		0xa3
35 
36 #define X_INDEX			3
37 #define Y_INDEX			5
38 #define TOUCH_INDEX		0xb
39 #define LSB_XY_INDEX		0xc
40 #define X_AXIS_MAX		2040
41 #define Y_AXIS_MAX		2040
42 
43 static bool invert_x;
44 module_param(invert_x, bool, 0644);
45 MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
46 static bool invert_y;
47 module_param(invert_y, bool, 0644);
48 MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
49 
50 static irqreturn_t htcpen_interrupt(int irq, void *handle)
51 {
52 	struct input_dev *htcpen_dev = handle;
53 	unsigned short x, y, xy;
54 
55 	/* 0 = press; 1 = release */
56 	outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX);
57 
58 	if (inb_p(HTCPEN_PORT_DATA)) {
59 		input_report_key(htcpen_dev, BTN_TOUCH, 0);
60 	} else {
61 		outb_p(X_INDEX, HTCPEN_PORT_INDEX);
62 		x = inb_p(HTCPEN_PORT_DATA);
63 
64 		outb_p(Y_INDEX, HTCPEN_PORT_INDEX);
65 		y = inb_p(HTCPEN_PORT_DATA);
66 
67 		outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX);
68 		xy = inb_p(HTCPEN_PORT_DATA);
69 
70 		/* get high resolution value of X and Y using LSB */
71 		x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf));
72 		y = (y * 8) + (xy & 0xf);
73 		if (invert_x)
74 			x = X_AXIS_MAX - x;
75 		if (invert_y)
76 			y = Y_AXIS_MAX - y;
77 
78 		if (x != X_AXIS_MAX && x != 0) {
79 			input_report_key(htcpen_dev, BTN_TOUCH, 1);
80 			input_report_abs(htcpen_dev, ABS_X, x);
81 			input_report_abs(htcpen_dev, ABS_Y, y);
82 		}
83 	}
84 
85 	input_sync(htcpen_dev);
86 
87 	inb_p(HTCPEN_PORT_IRQ_CLEAR);
88 
89 	return IRQ_HANDLED;
90 }
91 
92 static int htcpen_open(struct input_dev *dev)
93 {
94 	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
95 
96 	return 0;
97 }
98 
99 static void htcpen_close(struct input_dev *dev)
100 {
101 	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
102 	synchronize_irq(HTCPEN_IRQ);
103 }
104 
105 static int htcpen_isa_probe(struct device *dev, unsigned int id)
106 {
107 	struct input_dev *htcpen_dev;
108 	int err = -EBUSY;
109 
110 	if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) {
111 		printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
112 			HTCPEN_PORT_IRQ_CLEAR);
113 		goto request_region1_failed;
114 	}
115 
116 	if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) {
117 		printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
118 			HTCPEN_PORT_INIT);
119 		goto request_region2_failed;
120 	}
121 
122 	if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) {
123 		printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
124 			HTCPEN_PORT_INDEX);
125 		goto request_region3_failed;
126 	}
127 
128 	htcpen_dev = input_allocate_device();
129 	if (!htcpen_dev) {
130 		printk(KERN_ERR "htcpen: can't allocate device\n");
131 		err = -ENOMEM;
132 		goto input_alloc_failed;
133 	}
134 
135 	htcpen_dev->name = "HTC Shift EC TouchScreen";
136 	htcpen_dev->id.bustype = BUS_ISA;
137 
138 	htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
139 	htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
140 	input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0);
141 	input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0);
142 
143 	htcpen_dev->open = htcpen_open;
144 	htcpen_dev->close = htcpen_close;
145 
146 	err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen",
147 			htcpen_dev);
148 	if (err) {
149 		printk(KERN_ERR "htcpen: irq busy\n");
150 		goto request_irq_failed;
151 	}
152 
153 	inb_p(HTCPEN_PORT_IRQ_CLEAR);
154 
155 	err = input_register_device(htcpen_dev);
156 	if (err)
157 		goto input_register_failed;
158 
159 	dev_set_drvdata(dev, htcpen_dev);
160 
161 	return 0;
162 
163  input_register_failed:
164 	free_irq(HTCPEN_IRQ, htcpen_dev);
165  request_irq_failed:
166 	input_free_device(htcpen_dev);
167  input_alloc_failed:
168 	release_region(HTCPEN_PORT_INDEX, 2);
169  request_region3_failed:
170 	release_region(HTCPEN_PORT_INIT, 1);
171  request_region2_failed:
172 	release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
173  request_region1_failed:
174 	return err;
175 }
176 
177 static int htcpen_isa_remove(struct device *dev, unsigned int id)
178 {
179 	struct input_dev *htcpen_dev = dev_get_drvdata(dev);
180 
181 	input_unregister_device(htcpen_dev);
182 
183 	free_irq(HTCPEN_IRQ, htcpen_dev);
184 
185 	release_region(HTCPEN_PORT_INDEX, 2);
186 	release_region(HTCPEN_PORT_INIT, 1);
187 	release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
188 
189 	dev_set_drvdata(dev, NULL);
190 
191 	return 0;
192 }
193 
194 #ifdef CONFIG_PM
195 static int htcpen_isa_suspend(struct device *dev, unsigned int n,
196 				pm_message_t state)
197 {
198 	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
199 
200 	return 0;
201 }
202 
203 static int htcpen_isa_resume(struct device *dev, unsigned int n)
204 {
205 	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
206 
207 	return 0;
208 }
209 #endif
210 
211 static struct isa_driver htcpen_isa_driver = {
212 	.probe		= htcpen_isa_probe,
213 	.remove		= htcpen_isa_remove,
214 #ifdef CONFIG_PM
215 	.suspend	= htcpen_isa_suspend,
216 	.resume		= htcpen_isa_resume,
217 #endif
218 	.driver = {
219 		.owner	= THIS_MODULE,
220 		.name	= "htcpen",
221 	}
222 };
223 
224 static struct dmi_system_id htcshift_dmi_table[] __initdata = {
225 	{
226 		.ident = "Shift",
227 		.matches = {
228 			DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
229 			DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
230 		},
231 	},
232 	{ }
233 };
234 MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table);
235 
236 static int __init htcpen_isa_init(void)
237 {
238 	if (!dmi_check_system(htcshift_dmi_table))
239 		return -ENODEV;
240 
241 	return isa_register_driver(&htcpen_isa_driver, 1);
242 }
243 
244 static void __exit htcpen_isa_exit(void)
245 {
246 	isa_unregister_driver(&htcpen_isa_driver);
247 }
248 
249 module_init(htcpen_isa_init);
250 module_exit(htcpen_isa_exit);
251