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 
20 MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
21 MODULE_DESCRIPTION("HTC Shift touchscreen driver");
22 MODULE_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 
40 static bool invert_x;
41 module_param(invert_x, bool, 0644);
42 MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
43 static bool invert_y;
44 module_param(invert_y, bool, 0644);
45 MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
46 
htcpen_interrupt(int irq,void * handle)47 static 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 
htcpen_open(struct input_dev * dev)89 static int htcpen_open(struct input_dev *dev)
90 {
91 	outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
92 
93 	return 0;
94 }
95 
htcpen_close(struct input_dev * dev)96 static void htcpen_close(struct input_dev *dev)
97 {
98 	outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
99 	synchronize_irq(HTCPEN_IRQ);
100 }
101 
htcpen_isa_probe(struct device * dev,unsigned int id)102 static 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 
htcpen_isa_remove(struct device * dev,unsigned int id)174 static 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
htcpen_isa_suspend(struct device * dev,unsigned int n,pm_message_t state)188 static 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 
htcpen_isa_resume(struct device * dev,unsigned int n)196 static 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 
204 static 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 
217 static 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 };
227 MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table);
228 
htcpen_isa_init(void)229 static 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 
htcpen_isa_exit(void)237 static void __exit htcpen_isa_exit(void)
238 {
239 	isa_unregister_driver(&htcpen_isa_driver);
240 }
241 
242 module_init(htcpen_isa_init);
243 module_exit(htcpen_isa_exit);
244