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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 | 23 | #include <linux/serio.h> |
ee479999 | 24 | |
21ae508b | 25 | #define DRIVER_DESC "PenMount serial touchscreen driver" |
ee479999 RK |
26 | |
27 | MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); | |
21ae508b | 28 | MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>"); |
ee479999 RK |
29 | MODULE_DESCRIPTION(DRIVER_DESC); |
30 | MODULE_LICENSE("GPL"); | |
31 | ||
32 | /* | |
33 | * Definitions & global arrays. | |
34 | */ | |
35 | ||
c42e2e40 | 36 | #define PM_MAX_LENGTH 6 |
90aba7d8 JS |
37 | #define PM_MAX_MTSLOT 16 |
38 | #define PM_3000_MTSLOT 2 | |
bd8f6d2e | 39 | #define PM_6250_MTSLOT 12 |
90aba7d8 JS |
40 | |
41 | /* | |
42 | * Multi-touch slot | |
43 | */ | |
44 | ||
45 | struct mt_slot { | |
46 | unsigned short x, y; | |
47 | bool active; /* is the touch valid? */ | |
48 | }; | |
ee479999 RK |
49 | |
50 | /* | |
51 | * Per-touchscreen data. | |
52 | */ | |
53 | ||
54 | struct pm { | |
55 | struct input_dev *dev; | |
56 | struct serio *serio; | |
57 | int idx; | |
58 | unsigned char data[PM_MAX_LENGTH]; | |
59 | char phys[32]; | |
c42e2e40 | 60 | unsigned char packetsize; |
90aba7d8 JS |
61 | unsigned char maxcontacts; |
62 | struct mt_slot slots[PM_MAX_MTSLOT]; | |
98b013eb | 63 | void (*parse_packet)(struct pm *); |
ee479999 RK |
64 | }; |
65 | ||
90aba7d8 JS |
66 | /* |
67 | * pm_mtevent() sends mt events and also emulates pointer movement | |
68 | */ | |
69 | ||
70 | static void pm_mtevent(struct pm *pm, struct input_dev *input) | |
71 | { | |
72 | int i; | |
73 | ||
74 | for (i = 0; i < pm->maxcontacts; ++i) { | |
75 | input_mt_slot(input, i); | |
76 | input_mt_report_slot_state(input, MT_TOOL_FINGER, | |
77 | pm->slots[i].active); | |
78 | if (pm->slots[i].active) { | |
79 | input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x); | |
80 | input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y); | |
81 | } | |
82 | } | |
83 | ||
84 | input_mt_report_pointer_emulation(input, true); | |
85 | input_sync(input); | |
86 | } | |
87 | ||
c42e2e40 JS |
88 | /* |
89 | * pm_checkpacket() checks if data packet is valid | |
90 | */ | |
91 | ||
92 | static bool pm_checkpacket(unsigned char *packet) | |
93 | { | |
94 | int total = 0; | |
95 | int i; | |
96 | ||
97 | for (i = 0; i < 5; i++) | |
98 | total += packet[i]; | |
99 | ||
100 | return packet[5] == (unsigned char)~(total & 0xff); | |
101 | } | |
102 | ||
98b013eb | 103 | static void pm_parse_9000(struct pm *pm) |
ee479999 | 104 | { |
ee479999 RK |
105 | struct input_dev *dev = pm->dev; |
106 | ||
98b013eb DT |
107 | if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) { |
108 | input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]); | |
109 | input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]); | |
110 | input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40)); | |
111 | input_sync(dev); | |
112 | pm->idx = 0; | |
113 | } | |
114 | } | |
ee479999 | 115 | |
98b013eb DT |
116 | static void pm_parse_6000(struct pm *pm) |
117 | { | |
118 | struct input_dev *dev = pm->dev; | |
c42e2e40 | 119 | |
98b013eb DT |
120 | if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) { |
121 | if (pm_checkpacket(pm->data)) { | |
122 | input_report_abs(dev, ABS_X, | |
123 | pm->data[2] * 256 + pm->data[1]); | |
124 | input_report_abs(dev, ABS_Y, | |
125 | pm->data[4] * 256 + pm->data[3]); | |
126 | input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40); | |
127 | input_sync(dev); | |
ee479999 | 128 | } |
98b013eb DT |
129 | pm->idx = 0; |
130 | } | |
131 | } | |
132 | ||
133 | static void pm_parse_3000(struct pm *pm) | |
134 | { | |
135 | struct input_dev *dev = pm->dev; | |
90aba7d8 | 136 | |
98b013eb DT |
137 | if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) { |
138 | if (pm_checkpacket(pm->data)) { | |
139 | int slotnum = pm->data[0] & 0x0f; | |
140 | pm->slots[slotnum].active = pm->data[0] & 0x30; | |
141 | pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1]; | |
142 | pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3]; | |
143 | pm_mtevent(pm, dev); | |
90aba7d8 | 144 | } |
98b013eb DT |
145 | pm->idx = 0; |
146 | } | |
147 | } | |
148 | ||
149 | static void pm_parse_6250(struct pm *pm) | |
150 | { | |
151 | struct input_dev *dev = pm->dev; | |
bd8f6d2e | 152 | |
98b013eb DT |
153 | if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) { |
154 | if (pm_checkpacket(pm->data)) { | |
155 | int slotnum = pm->data[0] & 0x0f; | |
156 | pm->slots[slotnum].active = pm->data[0] & 0x40; | |
157 | pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1]; | |
158 | pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3]; | |
159 | pm_mtevent(pm, dev); | |
bd8f6d2e | 160 | } |
98b013eb | 161 | pm->idx = 0; |
ee479999 | 162 | } |
98b013eb DT |
163 | } |
164 | ||
165 | static irqreturn_t pm_interrupt(struct serio *serio, | |
166 | unsigned char data, unsigned int flags) | |
167 | { | |
168 | struct pm *pm = serio_get_drvdata(serio); | |
169 | ||
170 | pm->data[pm->idx] = data; | |
171 | ||
172 | pm->parse_packet(pm); | |
ee479999 RK |
173 | |
174 | return IRQ_HANDLED; | |
175 | } | |
176 | ||
177 | /* | |
178 | * pm_disconnect() is the opposite of pm_connect() | |
179 | */ | |
180 | ||
181 | static void pm_disconnect(struct serio *serio) | |
182 | { | |
183 | struct pm *pm = serio_get_drvdata(serio); | |
184 | ||
ee479999 | 185 | serio_close(serio); |
c3a01ba9 DT |
186 | |
187 | input_unregister_device(pm->dev); | |
ee479999 | 188 | kfree(pm); |
c3a01ba9 DT |
189 | |
190 | serio_set_drvdata(serio, NULL); | |
ee479999 RK |
191 | } |
192 | ||
193 | /* | |
194 | * pm_connect() is the routine that is called when someone adds a | |
21ae508b | 195 | * new serio device that supports PenMount protocol and registers it as |
ee479999 RK |
196 | * an input device. |
197 | */ | |
198 | ||
199 | static int pm_connect(struct serio *serio, struct serio_driver *drv) | |
200 | { | |
201 | struct pm *pm; | |
202 | struct input_dev *input_dev; | |
90aba7d8 | 203 | int max_x, max_y; |
ee479999 RK |
204 | int err; |
205 | ||
206 | pm = kzalloc(sizeof(struct pm), GFP_KERNEL); | |
207 | input_dev = input_allocate_device(); | |
208 | if (!pm || !input_dev) { | |
209 | err = -ENOMEM; | |
210 | goto fail1; | |
211 | } | |
212 | ||
213 | pm->serio = serio; | |
214 | pm->dev = input_dev; | |
215 | snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys); | |
90aba7d8 | 216 | pm->maxcontacts = 1; |
ee479999 | 217 | |
21ae508b | 218 | input_dev->name = "PenMount Serial TouchScreen"; |
ee479999 RK |
219 | input_dev->phys = pm->phys; |
220 | input_dev->id.bustype = BUS_RS232; | |
221 | input_dev->id.vendor = SERIO_PENMOUNT; | |
222 | input_dev->id.product = 0; | |
223 | input_dev->id.version = 0x0100; | |
a5394fb0 | 224 | input_dev->dev.parent = &serio->dev; |
ee479999 | 225 | |
90aba7d8 JS |
226 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
227 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
c42e2e40 JS |
228 | |
229 | switch (serio->id.id) { | |
230 | default: | |
231 | case 0: | |
232 | pm->packetsize = 5; | |
98b013eb | 233 | pm->parse_packet = pm_parse_9000; |
c42e2e40 | 234 | input_dev->id.product = 0x9000; |
90aba7d8 | 235 | max_x = max_y = 0x3ff; |
c42e2e40 JS |
236 | break; |
237 | ||
238 | case 1: | |
239 | pm->packetsize = 6; | |
98b013eb | 240 | pm->parse_packet = pm_parse_6000; |
c42e2e40 | 241 | input_dev->id.product = 0x6000; |
90aba7d8 JS |
242 | max_x = max_y = 0x3ff; |
243 | break; | |
244 | ||
245 | case 2: | |
246 | pm->packetsize = 6; | |
98b013eb | 247 | pm->parse_packet = pm_parse_3000; |
90aba7d8 JS |
248 | input_dev->id.product = 0x3000; |
249 | max_x = max_y = 0x7ff; | |
250 | pm->maxcontacts = PM_3000_MTSLOT; | |
c42e2e40 | 251 | break; |
bd8f6d2e JS |
252 | |
253 | case 3: | |
254 | pm->packetsize = 6; | |
98b013eb | 255 | pm->parse_packet = pm_parse_6250; |
bd8f6d2e JS |
256 | input_dev->id.product = 0x6250; |
257 | max_x = max_y = 0x3ff; | |
258 | pm->maxcontacts = PM_6250_MTSLOT; | |
259 | break; | |
c42e2e40 | 260 | } |
90aba7d8 JS |
261 | |
262 | input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0); | |
263 | input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0); | |
264 | ||
265 | if (pm->maxcontacts > 1) { | |
b4adbbef | 266 | input_mt_init_slots(pm->dev, pm->maxcontacts, 0); |
90aba7d8 JS |
267 | input_set_abs_params(pm->dev, |
268 | ABS_MT_POSITION_X, 0, max_x, 0, 0); | |
269 | input_set_abs_params(pm->dev, | |
270 | ABS_MT_POSITION_Y, 0, max_y, 0, 0); | |
271 | } | |
ee479999 RK |
272 | |
273 | serio_set_drvdata(serio, pm); | |
274 | ||
275 | err = serio_open(serio, drv); | |
276 | if (err) | |
277 | goto fail2; | |
278 | ||
279 | err = input_register_device(pm->dev); | |
280 | if (err) | |
281 | goto fail3; | |
282 | ||
283 | return 0; | |
284 | ||
285 | fail3: serio_close(serio); | |
286 | fail2: serio_set_drvdata(serio, NULL); | |
287 | fail1: input_free_device(input_dev); | |
288 | kfree(pm); | |
289 | return err; | |
290 | } | |
291 | ||
292 | /* | |
293 | * The serio driver structure. | |
294 | */ | |
295 | ||
296 | static struct serio_device_id pm_serio_ids[] = { | |
297 | { | |
298 | .type = SERIO_RS232, | |
299 | .proto = SERIO_PENMOUNT, | |
300 | .id = SERIO_ANY, | |
301 | .extra = SERIO_ANY, | |
302 | }, | |
303 | { 0 } | |
304 | }; | |
305 | ||
306 | MODULE_DEVICE_TABLE(serio, pm_serio_ids); | |
307 | ||
308 | static struct serio_driver pm_drv = { | |
309 | .driver = { | |
21ae508b | 310 | .name = "serio-penmount", |
ee479999 RK |
311 | }, |
312 | .description = DRIVER_DESC, | |
313 | .id_table = pm_serio_ids, | |
314 | .interrupt = pm_interrupt, | |
315 | .connect = pm_connect, | |
316 | .disconnect = pm_disconnect, | |
317 | }; | |
318 | ||
65ac9f7a | 319 | module_serio_driver(pm_drv); |