1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * HTC Shift touchscreen driver
4 *
5 * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org>
6 */
7
8#include <linux/errno.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/input.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/init.h>
15#include <linux/irq.h>
16#include <linux/isa.h>
17#include <linux/ioport.h>
18#include <linux/dmi.h>
19
20MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
21MODULE_DESCRIPTION("HTC Shift touchscreen driver");
22MODULE_LICENSE("GPL");
23
24#define HTCPEN_PORT_IRQ_CLEAR	0x068
25#define HTCPEN_PORT_INIT	0x06c
26#define HTCPEN_PORT_INDEX	0x0250
27#define HTCPEN_PORT_DATA	0x0251
28#define HTCPEN_IRQ		3
29
30#define DEVICE_ENABLE		0xa2
31#define DEVICE_DISABLE		0xa3
32
33#define X_INDEX			3
34#define Y_INDEX			5
35#define TOUCH_INDEX		0xb
36#define LSB_XY_INDEX		0xc
37#define X_AXIS_MAX		2040
38#define Y_AXIS_MAX		2040
39
40static bool invert_x;
41module_param(invert_x, bool, 0644);
42MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
43static bool invert_y;
44module_param(invert_y, bool, 0644);
45MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
46
47static irqreturn_t htcpen_interrupt(int irq, void *handle)
48{
49	struct input_dev *htcpen_dev = handle;
50	unsigned short x, y, xy;
51
52	/* 0 = press; 1 = release */
53	outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX);
54
55	if (inb_p(HTCPEN_PORT_DATA)) {
56		input_report_key(htcpen_dev, BTN_TOUCH, 0);
57	} else {
58		outb_p(X_INDEX, HTCPEN_PORT_INDEX);
59		x = inb_p(HTCPEN_PORT_DATA);
60
61		outb_p(Y_INDEX, HTCPEN_PORT_INDEX);
62		y = inb_p(HTCPEN_PORT_DATA);
63
64		outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX);
65		xy = inb_p(HTCPEN_PORT_DATA);
66
67		/* get high resolution value of X and Y using LSB */
68		x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf));
69		y = (y * 8) + (xy & 0xf);
70		if (invert_x)
71			x = X_AXIS_MAX - x;
72		if (invert_y)
73			y = Y_AXIS_MAX - y;
74
75		if (x != X_AXIS_MAX && x != 0) {
76			input_report_key(htcpen_dev, BTN_TOUCH, 1);
77			input_report_abs(htcpen_dev, ABS_X, x);
78			input_report_abs(htcpen_dev, ABS_Y, y);
79		}
80	}
81
82	input_sync(htcpen_dev);
83
84	inb_p(HTCPEN_PORT_IRQ_CLEAR);
85
86	return IRQ_HANDLED;
87}
88
89static int htcpen_open(struct input_dev *dev)
90{
91	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
92
93	return 0;
94}
95
96static void htcpen_close(struct input_dev *dev)
97{
98	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
99	synchronize_irq(HTCPEN_IRQ);
100}
101
102static int htcpen_isa_probe(struct device *dev, unsigned int id)
103{
104	struct input_dev *htcpen_dev;
105	int err = -EBUSY;
106
107	if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) {
108		printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
109			HTCPEN_PORT_IRQ_CLEAR);
110		goto request_region1_failed;
111	}
112
113	if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) {
114		printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
115			HTCPEN_PORT_INIT);
116		goto request_region2_failed;
117	}
118
119	if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) {
120		printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
121			HTCPEN_PORT_INDEX);
122		goto request_region3_failed;
123	}
124
125	htcpen_dev = input_allocate_device();
126	if (!htcpen_dev) {
127		printk(KERN_ERR "htcpen: can't allocate device\n");
128		err = -ENOMEM;
129		goto input_alloc_failed;
130	}
131
132	htcpen_dev->name = "HTC Shift EC TouchScreen";
133	htcpen_dev->id.bustype = BUS_ISA;
134
135	htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
136	htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
137	input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0);
138	input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0);
139
140	htcpen_dev->open = htcpen_open;
141	htcpen_dev->close = htcpen_close;
142
143	err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen",
144			htcpen_dev);
145	if (err) {
146		printk(KERN_ERR "htcpen: irq busy\n");
147		goto request_irq_failed;
148	}
149
150	inb_p(HTCPEN_PORT_IRQ_CLEAR);
151
152	err = input_register_device(htcpen_dev);
153	if (err)
154		goto input_register_failed;
155
156	dev_set_drvdata(dev, htcpen_dev);
157
158	return 0;
159
160 input_register_failed:
161	free_irq(HTCPEN_IRQ, htcpen_dev);
162 request_irq_failed:
163	input_free_device(htcpen_dev);
164 input_alloc_failed:
165	release_region(HTCPEN_PORT_INDEX, 2);
166 request_region3_failed:
167	release_region(HTCPEN_PORT_INIT, 1);
168 request_region2_failed:
169	release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
170 request_region1_failed:
171	return err;
172}
173
174static void htcpen_isa_remove(struct device *dev, unsigned int id)
175{
176	struct input_dev *htcpen_dev = dev_get_drvdata(dev);
177
178	input_unregister_device(htcpen_dev);
179
180	free_irq(HTCPEN_IRQ, htcpen_dev);
181
182	release_region(HTCPEN_PORT_INDEX, 2);
183	release_region(HTCPEN_PORT_INIT, 1);
184	release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
185}
186
187#ifdef CONFIG_PM
188static int htcpen_isa_suspend(struct device *dev, unsigned int n,
189				pm_message_t state)
190{
191	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
192
193	return 0;
194}
195
196static int htcpen_isa_resume(struct device *dev, unsigned int n)
197{
198	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
199
200	return 0;
201}
202#endif
203
204static struct isa_driver htcpen_isa_driver = {
205	.probe		= htcpen_isa_probe,
206	.remove		= htcpen_isa_remove,
207#ifdef CONFIG_PM
208	.suspend	= htcpen_isa_suspend,
209	.resume		= htcpen_isa_resume,
210#endif
211	.driver = {
212		.owner	= THIS_MODULE,
213		.name	= "htcpen",
214	}
215};
216
217static const struct dmi_system_id htcshift_dmi_table[] __initconst = {
218	{
219		.ident = "Shift",
220		.matches = {
221			DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
222			DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
223		},
224	},
225	{ }
226};
227MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table);
228
229static int __init htcpen_isa_init(void)
230{
231	if (!dmi_check_system(htcshift_dmi_table))
232		return -ENODEV;
233
234	return isa_register_driver(&htcpen_isa_driver, 1);
235}
236
237static void __exit htcpen_isa_exit(void)
238{
239	isa_unregister_driver(&htcpen_isa_driver);
240}
241
242module_init(htcpen_isa_init);
243module_exit(htcpen_isa_exit);
244