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