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ee479999 RK |
1 | /* |
2 | * Penmount serial touchscreen driver | |
3 | * | |
4 | * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> | |
21ae508b | 5 | * Copyright (c) 2011 John Sung <penmount.touch@gmail.com> |
ee479999 RK |
6 | * |
7 | * Based on ELO driver (drivers/input/touchscreen/elo.c) | |
8 | * Copyright (c) 2004 Vojtech Pavlik | |
9 | */ | |
10 | ||
11 | /* | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License version 2 as published | |
14 | * by the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/errno.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/input.h> | |
90aba7d8 | 22 | #include <linux/input/mt.h> |
ee479999 RK |
23 | #include <linux/serio.h> |
24 | #include <linux/init.h> | |
25 | ||
21ae508b | 26 | #define DRIVER_DESC "PenMount serial touchscreen driver" |
ee479999 RK |
27 | |
28 | MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); | |
21ae508b | 29 | MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>"); |
ee479999 RK |
30 | MODULE_DESCRIPTION(DRIVER_DESC); |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* | |
34 | * Definitions & global arrays. | |
35 | */ | |
36 | ||
c42e2e40 | 37 | #define PM_MAX_LENGTH 6 |
90aba7d8 JS |
38 | #define PM_MAX_MTSLOT 16 |
39 | #define PM_3000_MTSLOT 2 | |
bd8f6d2e | 40 | #define PM_6250_MTSLOT 12 |
90aba7d8 JS |
41 | |
42 | /* | |
43 | * Multi-touch slot | |
44 | */ | |
45 | ||
46 | struct mt_slot { | |
47 | unsigned short x, y; | |
48 | bool active; /* is the touch valid? */ | |
49 | }; | |
ee479999 RK |
50 | |
51 | /* | |
52 | * Per-touchscreen data. | |
53 | */ | |
54 | ||
55 | struct pm { | |
56 | struct input_dev *dev; | |
57 | struct serio *serio; | |
58 | int idx; | |
59 | unsigned char data[PM_MAX_LENGTH]; | |
60 | char phys[32]; | |
c42e2e40 | 61 | unsigned char packetsize; |
90aba7d8 JS |
62 | unsigned char maxcontacts; |
63 | struct mt_slot slots[PM_MAX_MTSLOT]; | |
98b013eb | 64 | void (*parse_packet)(struct pm *); |
ee479999 RK |
65 | }; |
66 | ||
90aba7d8 JS |
67 | /* |
68 | * pm_mtevent() sends mt events and also emulates pointer movement | |
69 | */ | |
70 | ||
71 | static void pm_mtevent(struct pm *pm, struct input_dev *input) | |
72 | { | |
73 | int i; | |
74 | ||
75 | for (i = 0; i < pm->maxcontacts; ++i) { | |
76 | input_mt_slot(input, i); | |
77 | input_mt_report_slot_state(input, MT_TOOL_FINGER, | |
78 | pm->slots[i].active); | |
79 | if (pm->slots[i].active) { | |
80 | input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x); | |
81 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y); | |
82 | } | |
83 | } | |
84 | ||
85 | input_mt_report_pointer_emulation(input, true); | |
86 | input_sync(input); | |
87 | } | |
88 | ||
c42e2e40 JS |
89 | /* |
90 | * pm_checkpacket() checks if data packet is valid | |
91 | */ | |
92 | ||
93 | static bool pm_checkpacket(unsigned char *packet) | |
94 | { | |
95 | int total = 0; | |
96 | int i; | |
97 | ||
98 | for (i = 0; i < 5; i++) | |
99 | total += packet[i]; | |
100 | ||
101 | return packet[5] == (unsigned char)~(total & 0xff); | |
102 | } | |
103 | ||
98b013eb | 104 | static void pm_parse_9000(struct pm *pm) |
ee479999 | 105 | { |
ee479999 RK |
106 | struct input_dev *dev = pm->dev; |
107 | ||
98b013eb DT |
108 | if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) { |
109 | input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]); | |
110 | input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]); | |
111 | input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40)); | |
112 | input_sync(dev); | |
113 | pm->idx = 0; | |
114 | } | |
115 | } | |
ee479999 | 116 | |
98b013eb DT |
117 | static void pm_parse_6000(struct pm *pm) |
118 | { | |
119 | struct input_dev *dev = pm->dev; | |
c42e2e40 | 120 | |
98b013eb DT |
121 | if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) { |
122 | if (pm_checkpacket(pm->data)) { | |
123 | input_report_abs(dev, ABS_X, | |
124 | pm->data[2] * 256 + pm->data[1]); | |
125 | input_report_abs(dev, ABS_Y, | |
126 | pm->data[4] * 256 + pm->data[3]); | |
127 | input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40); | |
128 | input_sync(dev); | |
ee479999 | 129 | } |
98b013eb DT |
130 | pm->idx = 0; |
131 | } | |
132 | } | |
133 | ||
134 | static void pm_parse_3000(struct pm *pm) | |
135 | { | |
136 | struct input_dev *dev = pm->dev; | |
90aba7d8 | 137 | |
98b013eb DT |
138 | if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) { |
139 | if (pm_checkpacket(pm->data)) { | |
140 | int slotnum = pm->data[0] & 0x0f; | |
141 | pm->slots[slotnum].active = pm->data[0] & 0x30; | |
142 | pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1]; | |
143 | pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3]; | |
144 | pm_mtevent(pm, dev); | |
90aba7d8 | 145 | } |
98b013eb DT |
146 | pm->idx = 0; |
147 | } | |
148 | } | |
149 | ||
150 | static void pm_parse_6250(struct pm *pm) | |
151 | { | |
152 | struct input_dev *dev = pm->dev; | |
bd8f6d2e | 153 | |
98b013eb DT |
154 | if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) { |
155 | if (pm_checkpacket(pm->data)) { | |
156 | int slotnum = pm->data[0] & 0x0f; | |
157 | pm->slots[slotnum].active = pm->data[0] & 0x40; | |
158 | pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1]; | |
159 | pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3]; | |
160 | pm_mtevent(pm, dev); | |
bd8f6d2e | 161 | } |
98b013eb | 162 | pm->idx = 0; |
ee479999 | 163 | } |
98b013eb DT |
164 | } |
165 | ||
166 | static irqreturn_t pm_interrupt(struct serio *serio, | |
167 | unsigned char data, unsigned int flags) | |
168 | { | |
169 | struct pm *pm = serio_get_drvdata(serio); | |
170 | ||
171 | pm->data[pm->idx] = data; | |
172 | ||
173 | pm->parse_packet(pm); | |
ee479999 RK |
174 | |
175 | return IRQ_HANDLED; | |
176 | } | |
177 | ||
178 | /* | |
179 | * pm_disconnect() is the opposite of pm_connect() | |
180 | */ | |
181 | ||
182 | static void pm_disconnect(struct serio *serio) | |
183 | { | |
184 | struct pm *pm = serio_get_drvdata(serio); | |
185 | ||
ee479999 | 186 | serio_close(serio); |
c3a01ba9 DT |
187 | |
188 | input_unregister_device(pm->dev); | |
ee479999 | 189 | kfree(pm); |
c3a01ba9 DT |
190 | |
191 | serio_set_drvdata(serio, NULL); | |
ee479999 RK |
192 | } |
193 | ||
194 | /* | |
195 | * pm_connect() is the routine that is called when someone adds a | |
21ae508b | 196 | * new serio device that supports PenMount protocol and registers it as |
ee479999 RK |
197 | * an input device. |
198 | */ | |
199 | ||
200 | static int pm_connect(struct serio *serio, struct serio_driver *drv) | |
201 | { | |
202 | struct pm *pm; | |
203 | struct input_dev *input_dev; | |
90aba7d8 | 204 | int max_x, max_y; |
ee479999 RK |
205 | int err; |
206 | ||
207 | pm = kzalloc(sizeof(struct pm), GFP_KERNEL); | |
208 | input_dev = input_allocate_device(); | |
209 | if (!pm || !input_dev) { | |
210 | err = -ENOMEM; | |
211 | goto fail1; | |
212 | } | |
213 | ||
214 | pm->serio = serio; | |
215 | pm->dev = input_dev; | |
216 | snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys); | |
90aba7d8 | 217 | pm->maxcontacts = 1; |
ee479999 | 218 | |
21ae508b | 219 | input_dev->name = "PenMount Serial TouchScreen"; |
ee479999 RK |
220 | input_dev->phys = pm->phys; |
221 | input_dev->id.bustype = BUS_RS232; | |
222 | input_dev->id.vendor = SERIO_PENMOUNT; | |
223 | input_dev->id.product = 0; | |
224 | input_dev->id.version = 0x0100; | |
a5394fb0 | 225 | input_dev->dev.parent = &serio->dev; |
ee479999 | 226 | |
90aba7d8 JS |
227 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
228 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
c42e2e40 JS |
229 | |
230 | switch (serio->id.id) { | |
231 | default: | |
232 | case 0: | |
233 | pm->packetsize = 5; | |
98b013eb | 234 | pm->parse_packet = pm_parse_9000; |
c42e2e40 | 235 | input_dev->id.product = 0x9000; |
90aba7d8 | 236 | max_x = max_y = 0x3ff; |
c42e2e40 JS |
237 | break; |
238 | ||
239 | case 1: | |
240 | pm->packetsize = 6; | |
98b013eb | 241 | pm->parse_packet = pm_parse_6000; |
c42e2e40 | 242 | input_dev->id.product = 0x6000; |
90aba7d8 JS |
243 | max_x = max_y = 0x3ff; |
244 | break; | |
245 | ||
246 | case 2: | |
247 | pm->packetsize = 6; | |
98b013eb | 248 | pm->parse_packet = pm_parse_3000; |
90aba7d8 JS |
249 | input_dev->id.product = 0x3000; |
250 | max_x = max_y = 0x7ff; | |
251 | pm->maxcontacts = PM_3000_MTSLOT; | |
c42e2e40 | 252 | break; |
bd8f6d2e JS |
253 | |
254 | case 3: | |
255 | pm->packetsize = 6; | |
98b013eb | 256 | pm->parse_packet = pm_parse_6250; |
bd8f6d2e JS |
257 | input_dev->id.product = 0x6250; |
258 | max_x = max_y = 0x3ff; | |
259 | pm->maxcontacts = PM_6250_MTSLOT; | |
260 | break; | |
c42e2e40 | 261 | } |
90aba7d8 JS |
262 | |
263 | input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0); | |
264 | input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0); | |
265 | ||
266 | if (pm->maxcontacts > 1) { | |
267 | input_mt_init_slots(pm->dev, pm->maxcontacts); | |
268 | input_set_abs_params(pm->dev, | |
269 | ABS_MT_POSITION_X, 0, max_x, 0, 0); | |
270 | input_set_abs_params(pm->dev, | |
271 | ABS_MT_POSITION_Y, 0, max_y, 0, 0); | |
272 | } | |
ee479999 RK |
273 | |
274 | serio_set_drvdata(serio, pm); | |
275 | ||
276 | err = serio_open(serio, drv); | |
277 | if (err) | |
278 | goto fail2; | |
279 | ||
280 | err = input_register_device(pm->dev); | |
281 | if (err) | |
282 | goto fail3; | |
283 | ||
284 | return 0; | |
285 | ||
286 | fail3: serio_close(serio); | |
287 | fail2: serio_set_drvdata(serio, NULL); | |
288 | fail1: input_free_device(input_dev); | |
289 | kfree(pm); | |
290 | return err; | |
291 | } | |
292 | ||
293 | /* | |
294 | * The serio driver structure. | |
295 | */ | |
296 | ||
297 | static struct serio_device_id pm_serio_ids[] = { | |
298 | { | |
299 | .type = SERIO_RS232, | |
300 | .proto = SERIO_PENMOUNT, | |
301 | .id = SERIO_ANY, | |
302 | .extra = SERIO_ANY, | |
303 | }, | |
304 | { 0 } | |
305 | }; | |
306 | ||
307 | MODULE_DEVICE_TABLE(serio, pm_serio_ids); | |
308 | ||
309 | static struct serio_driver pm_drv = { | |
310 | .driver = { | |
21ae508b | 311 | .name = "serio-penmount", |
ee479999 RK |
312 | }, |
313 | .description = DRIVER_DESC, | |
314 | .id_table = pm_serio_ids, | |
315 | .interrupt = pm_interrupt, | |
316 | .connect = pm_connect, | |
317 | .disconnect = pm_disconnect, | |
318 | }; | |
319 | ||
65ac9f7a | 320 | module_serio_driver(pm_drv); |