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 | |
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(dev: htcpen_dev, BTN_TOUCH, value: 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(dev: htcpen_dev, BTN_TOUCH, value: 1); |
77 | input_report_abs(dev: htcpen_dev, ABS_X, value: x); |
78 | input_report_abs(dev: htcpen_dev, ABS_Y, value: y); |
79 | } |
80 | } |
81 | |
82 | input_sync(dev: htcpen_dev); |
83 | |
84 | inb_p(HTCPEN_PORT_IRQ_CLEAR); |
85 | |
86 | return IRQ_HANDLED; |
87 | } |
88 | |
89 | static int htcpen_open(struct input_dev *dev) |
90 | { |
91 | outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); |
92 | |
93 | return 0; |
94 | } |
95 | |
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 | |
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(dev: htcpen_dev, ABS_X, min: 0, X_AXIS_MAX, fuzz: 0, flat: 0); |
138 | input_set_abs_params(dev: htcpen_dev, ABS_Y, min: 0, Y_AXIS_MAX, fuzz: 0, flat: 0); |
139 | |
140 | htcpen_dev->open = htcpen_open; |
141 | htcpen_dev->close = htcpen_close; |
142 | |
143 | err = request_irq(HTCPEN_IRQ, handler: htcpen_interrupt, flags: 0, name: "htcpen" , |
144 | dev: 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, data: 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(dev: 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 | |
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 |
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 | |
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 | |
229 | static int __init htcpen_isa_init(void) |
230 | { |
231 | if (!dmi_check_system(list: htcshift_dmi_table)) |
232 | return -ENODEV; |
233 | |
234 | return isa_register_driver(&htcpen_isa_driver, 1); |
235 | } |
236 | |
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 | |