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
23MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
24MODULE_DESCRIPTION("HTC Shift touchscreen driver");
25MODULE_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
43static bool invert_x;
44module_param(invert_x, bool, 0644);
45MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
46static bool invert_y;
47module_param(invert_y, bool, 0644);
48MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
49
50static 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
92static int htcpen_open(struct input_dev *dev)
93{
94	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
95
96	return 0;
97}
98
99static void htcpen_close(struct input_dev *dev)
100{
101	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
102	synchronize_irq(HTCPEN_IRQ);
103}
104
105static 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
177static 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	return 0;
190}
191
192#ifdef CONFIG_PM
193static int htcpen_isa_suspend(struct device *dev, unsigned int n,
194				pm_message_t state)
195{
196	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
197
198	return 0;
199}
200
201static int htcpen_isa_resume(struct device *dev, unsigned int n)
202{
203	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
204
205	return 0;
206}
207#endif
208
209static struct isa_driver htcpen_isa_driver = {
210	.probe		= htcpen_isa_probe,
211	.remove		= htcpen_isa_remove,
212#ifdef CONFIG_PM
213	.suspend	= htcpen_isa_suspend,
214	.resume		= htcpen_isa_resume,
215#endif
216	.driver = {
217		.owner	= THIS_MODULE,
218		.name	= "htcpen",
219	}
220};
221
222static struct dmi_system_id htcshift_dmi_table[] __initdata = {
223	{
224		.ident = "Shift",
225		.matches = {
226			DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
227			DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
228		},
229	},
230	{ }
231};
232MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table);
233
234static int __init htcpen_isa_init(void)
235{
236	if (!dmi_check_system(htcshift_dmi_table))
237		return -ENODEV;
238
239	return isa_register_driver(&htcpen_isa_driver, 1);
240}
241
242static void __exit htcpen_isa_exit(void)
243{
244	isa_unregister_driver(&htcpen_isa_driver);
245}
246
247module_init(htcpen_isa_init);
248module_exit(htcpen_isa_exit);
249