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1da177e4 LT |
1 | /* |
2 | * Elo serial touchscreen driver | |
3 | * | |
4 | * Copyright (c) 2004 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License version 2 as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | /* | |
14 | * This driver can handle serial Elo touchscreens using either the Elo standard | |
15 | * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo | |
16 | * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol. | |
17 | */ | |
18 | ||
19 | #include <linux/errno.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/input.h> | |
24 | #include <linux/serio.h> | |
25 | #include <linux/init.h> | |
26 | ||
27 | #define DRIVER_DESC "Elo serial touchscreen driver" | |
28 | ||
29 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
30 | MODULE_DESCRIPTION(DRIVER_DESC); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* | |
34 | * Definitions & global arrays. | |
35 | */ | |
36 | ||
37 | #define ELO_MAX_LENGTH 10 | |
38 | ||
1da177e4 LT |
39 | /* |
40 | * Per-touchscreen data. | |
41 | */ | |
42 | ||
43 | struct elo { | |
eca1ed19 | 44 | struct input_dev *dev; |
1da177e4 LT |
45 | struct serio *serio; |
46 | int id; | |
47 | int idx; | |
48 | unsigned char csum; | |
49 | unsigned char data[ELO_MAX_LENGTH]; | |
50 | char phys[32]; | |
51 | }; | |
52 | ||
53 | static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs) | |
54 | { | |
eca1ed19 | 55 | struct input_dev *dev = elo->dev; |
1da177e4 LT |
56 | |
57 | elo->csum += elo->data[elo->idx] = data; | |
58 | ||
59 | switch (elo->idx++) { | |
60 | ||
61 | case 0: | |
62 | if (data != 'U') { | |
63 | elo->idx = 0; | |
64 | elo->csum = 0; | |
65 | } | |
66 | break; | |
67 | ||
68 | case 1: | |
69 | if (data != 'T') { | |
70 | elo->idx = 0; | |
71 | elo->csum = 0; | |
72 | } | |
73 | break; | |
74 | ||
75 | case 9: | |
76 | if (elo->csum) { | |
77 | input_regs(dev, regs); | |
78 | input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]); | |
79 | input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]); | |
80 | input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]); | |
eca1ed19 | 81 | input_report_key(dev, BTN_TOUCH, elo->data[8] || elo->data[7]); |
1da177e4 LT |
82 | input_sync(dev); |
83 | } | |
84 | elo->idx = 0; | |
85 | elo->csum = 0; | |
86 | break; | |
87 | } | |
88 | } | |
89 | ||
90 | static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs) | |
91 | { | |
eca1ed19 | 92 | struct input_dev *dev = elo->dev; |
1da177e4 LT |
93 | |
94 | elo->data[elo->idx] = data; | |
95 | ||
96 | switch (elo->idx++) { | |
97 | ||
98 | case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break; | |
99 | case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break; | |
100 | case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break; | |
101 | ||
102 | case 3: | |
103 | if (data & 0xc0) { | |
104 | elo->idx = 0; | |
105 | break; | |
106 | } | |
107 | ||
108 | input_regs(dev, regs); | |
109 | input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f)); | |
110 | input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f)); | |
111 | ||
112 | if (elo->id == 2) { | |
113 | input_report_key(dev, BTN_TOUCH, 1); | |
114 | input_sync(dev); | |
115 | elo->idx = 0; | |
116 | } | |
117 | ||
118 | break; | |
119 | ||
120 | case 4: | |
121 | if (data) { | |
122 | input_sync(dev); | |
123 | elo->idx = 0; | |
124 | } | |
125 | break; | |
126 | ||
127 | case 5: | |
128 | if ((data & 0xf0) == 0) { | |
129 | input_report_abs(dev, ABS_PRESSURE, elo->data[5]); | |
eca1ed19 | 130 | input_report_key(dev, BTN_TOUCH, !!elo->data[5]); |
1da177e4 LT |
131 | } |
132 | input_sync(dev); | |
133 | elo->idx = 0; | |
134 | break; | |
135 | } | |
136 | } | |
137 | ||
138 | static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs) | |
139 | { | |
eca1ed19 | 140 | struct input_dev *dev = elo->dev; |
1da177e4 LT |
141 | |
142 | elo->data[elo->idx] = data; | |
143 | ||
144 | switch (elo->idx++) { | |
145 | ||
146 | case 0: | |
147 | if ((data & 0x7f) != 0x01) | |
148 | elo->idx = 0; | |
149 | break; | |
150 | case 2: | |
151 | input_regs(dev, regs); | |
152 | input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80)); | |
153 | input_report_abs(dev, ABS_X, elo->data[1]); | |
154 | input_report_abs(dev, ABS_Y, elo->data[2]); | |
155 | input_sync(dev); | |
156 | elo->idx = 0; | |
157 | break; | |
158 | } | |
159 | } | |
160 | ||
161 | static irqreturn_t elo_interrupt(struct serio *serio, | |
162 | unsigned char data, unsigned int flags, struct pt_regs *regs) | |
163 | { | |
164 | struct elo* elo = serio_get_drvdata(serio); | |
165 | ||
166 | switch(elo->id) { | |
167 | case 0: | |
168 | elo_process_data_10(elo, data, regs); | |
169 | break; | |
170 | ||
171 | case 1: | |
172 | case 2: | |
173 | elo_process_data_6(elo, data, regs); | |
174 | break; | |
175 | ||
176 | case 3: | |
177 | elo_process_data_3(elo, data, regs); | |
178 | break; | |
179 | } | |
180 | ||
181 | return IRQ_HANDLED; | |
182 | } | |
183 | ||
184 | /* | |
185 | * elo_disconnect() is the opposite of elo_connect() | |
186 | */ | |
187 | ||
188 | static void elo_disconnect(struct serio *serio) | |
189 | { | |
190 | struct elo* elo = serio_get_drvdata(serio); | |
191 | ||
eca1ed19 | 192 | input_unregister_device(elo->dev); |
1da177e4 LT |
193 | serio_close(serio); |
194 | serio_set_drvdata(serio, NULL); | |
195 | kfree(elo); | |
196 | } | |
197 | ||
198 | /* | |
199 | * elo_connect() is the routine that is called when someone adds a | |
200 | * new serio device that supports Gunze protocol and registers it as | |
201 | * an input device. | |
202 | */ | |
203 | ||
204 | static int elo_connect(struct serio *serio, struct serio_driver *drv) | |
205 | { | |
206 | struct elo *elo; | |
eca1ed19 | 207 | struct input_dev *input_dev; |
1da177e4 LT |
208 | int err; |
209 | ||
eca1ed19 DT |
210 | elo = kzalloc(sizeof(struct elo), GFP_KERNEL); |
211 | input_dev = input_allocate_device(); | |
212 | if (!elo || !input_dev) { | |
213 | err = -ENOMEM; | |
214 | goto fail; | |
215 | } | |
1da177e4 | 216 | |
eca1ed19 DT |
217 | elo->serio = serio; |
218 | elo->id = serio->id.id; | |
219 | elo->dev = input_dev; | |
220 | snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys); | |
1da177e4 | 221 | |
eca1ed19 DT |
222 | input_dev->private = elo; |
223 | input_dev->name = "Elo Serial TouchScreen"; | |
224 | input_dev->phys = elo->phys; | |
225 | input_dev->id.bustype = BUS_RS232; | |
226 | input_dev->id.vendor = SERIO_ELO; | |
227 | input_dev->id.product = elo->id; | |
228 | input_dev->id.version = 0x0100; | |
229 | input_dev->cdev.dev = &serio->dev; | |
1da177e4 | 230 | |
eca1ed19 DT |
231 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
232 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); | |
1da177e4 LT |
233 | |
234 | switch (elo->id) { | |
235 | ||
236 | case 0: /* 10-byte protocol */ | |
eca1ed19 DT |
237 | input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0); |
238 | input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0); | |
239 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0); | |
1da177e4 | 240 | break; |
de1b963a | 241 | |
1da177e4 | 242 | case 1: /* 6-byte protocol */ |
eca1ed19 | 243 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0); |
1da177e4 LT |
244 | |
245 | case 2: /* 4-byte protocol */ | |
eca1ed19 DT |
246 | input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0); |
247 | input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0); | |
1da177e4 LT |
248 | break; |
249 | ||
250 | case 3: /* 3-byte protocol */ | |
eca1ed19 DT |
251 | input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0); |
252 | input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0); | |
1da177e4 LT |
253 | break; |
254 | } | |
255 | ||
1da177e4 LT |
256 | serio_set_drvdata(serio, elo); |
257 | ||
258 | err = serio_open(serio, drv); | |
eca1ed19 DT |
259 | if (err) |
260 | goto fail; | |
1da177e4 | 261 | |
eca1ed19 | 262 | input_register_device(elo->dev); |
1da177e4 | 263 | return 0; |
eca1ed19 DT |
264 | |
265 | fail: serio_set_drvdata(serio, NULL); | |
266 | input_free_device(input_dev); | |
267 | kfree(elo); | |
268 | return err; | |
1da177e4 LT |
269 | } |
270 | ||
271 | /* | |
272 | * The serio driver structure. | |
273 | */ | |
274 | ||
275 | static struct serio_device_id elo_serio_ids[] = { | |
276 | { | |
277 | .type = SERIO_RS232, | |
278 | .proto = SERIO_ELO, | |
279 | .id = SERIO_ANY, | |
280 | .extra = SERIO_ANY, | |
281 | }, | |
282 | { 0 } | |
283 | }; | |
284 | ||
285 | MODULE_DEVICE_TABLE(serio, elo_serio_ids); | |
286 | ||
287 | static struct serio_driver elo_drv = { | |
288 | .driver = { | |
289 | .name = "elo", | |
290 | }, | |
291 | .description = DRIVER_DESC, | |
292 | .id_table = elo_serio_ids, | |
293 | .interrupt = elo_interrupt, | |
294 | .connect = elo_connect, | |
295 | .disconnect = elo_disconnect, | |
296 | }; | |
297 | ||
298 | /* | |
299 | * The functions for inserting/removing us as a module. | |
300 | */ | |
301 | ||
302 | static int __init elo_init(void) | |
303 | { | |
304 | serio_register_driver(&elo_drv); | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static void __exit elo_exit(void) | |
309 | { | |
310 | serio_unregister_driver(&elo_drv); | |
311 | } | |
312 | ||
313 | module_init(elo_init); | |
314 | module_exit(elo_exit); |