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3ace3686 HG |
1 | /* |
2 | * Focaltech TouchPad PS/2 mouse driver | |
3 | * | |
4 | * Copyright (c) 2014 Red Hat Inc. | |
05be1d07 | 5 | * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com> |
3ace3686 HG |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * Red Hat authors: | |
13 | * | |
14 | * Hans de Goede <hdegoede@redhat.com> | |
15 | */ | |
16 | ||
3ace3686 HG |
17 | |
18 | #include <linux/device.h> | |
19 | #include <linux/libps2.h> | |
05be1d07 MG |
20 | #include <linux/input/mt.h> |
21 | #include <linux/serio.h> | |
22 | #include <linux/slab.h> | |
3ace3686 | 23 | #include "psmouse.h" |
05be1d07 | 24 | #include "focaltech.h" |
3ace3686 HG |
25 | |
26 | static const char * const focaltech_pnp_ids[] = { | |
27 | "FLT0101", | |
28 | "FLT0102", | |
29 | "FLT0103", | |
30 | NULL | |
31 | }; | |
32 | ||
05be1d07 MG |
33 | /* |
34 | * Even if the kernel is built without support for Focaltech PS/2 touchpads (or | |
35 | * when the real driver fails to recognize the device), we still have to detect | |
36 | * them in order to avoid further detection attempts confusing the touchpad. | |
37 | * This way it at least works in PS/2 mouse compatibility mode. | |
38 | */ | |
3ace3686 HG |
39 | int focaltech_detect(struct psmouse *psmouse, bool set_properties) |
40 | { | |
41 | if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids)) | |
42 | return -ENODEV; | |
43 | ||
44 | if (set_properties) { | |
45 | psmouse->vendor = "FocalTech"; | |
05be1d07 | 46 | psmouse->name = "FocalTech Touchpad"; |
3ace3686 HG |
47 | } |
48 | ||
49 | return 0; | |
50 | } | |
51 | ||
05be1d07 | 52 | static void focaltech_reset(struct psmouse *psmouse) |
3ace3686 HG |
53 | { |
54 | ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); | |
55 | psmouse_reset(psmouse); | |
05be1d07 MG |
56 | } |
57 | ||
58 | #ifdef CONFIG_MOUSE_PS2_FOCALTECH | |
59 | ||
60 | /* | |
61 | * Packet types - the numbers are not consecutive, so we might be missing | |
62 | * something here. | |
63 | */ | |
64 | #define FOC_TOUCH 0x3 /* bitmap of active fingers */ | |
65 | #define FOC_ABS 0x6 /* absolute position of one finger */ | |
66 | #define FOC_REL 0x9 /* relative position of 1-2 fingers */ | |
67 | ||
68 | #define FOC_MAX_FINGERS 5 | |
69 | ||
70 | #define FOC_MAX_X 2431 | |
71 | #define FOC_MAX_Y 1663 | |
72 | ||
73 | /* | |
74 | * Current state of a single finger on the touchpad. | |
75 | */ | |
76 | struct focaltech_finger_state { | |
77 | /* The touchpad has generated a touch event for the finger */ | |
78 | bool active; | |
79 | ||
80 | /* | |
81 | * The touchpad has sent position data for the finger. The | |
82 | * flag is 0 when the finger is not active, and there is a | |
83 | * time between the first touch event for the finger and the | |
84 | * following absolute position packet for the finger where the | |
85 | * touchpad has declared the finger to be valid, but we do not | |
86 | * have any valid position yet. | |
87 | */ | |
88 | bool valid; | |
89 | ||
90 | /* | |
91 | * Absolute position (from the bottom left corner) of the | |
92 | * finger. | |
93 | */ | |
94 | unsigned int x; | |
95 | unsigned int y; | |
96 | }; | |
97 | ||
98 | /* | |
99 | * Description of the current state of the touchpad hardware. | |
100 | */ | |
101 | struct focaltech_hw_state { | |
102 | /* | |
103 | * The touchpad tracks the positions of the fingers for us, | |
104 | * the array indices correspond to the finger indices returned | |
105 | * in the report packages. | |
106 | */ | |
107 | struct focaltech_finger_state fingers[FOC_MAX_FINGERS]; | |
108 | ||
109 | /* True if the clickpad has been pressed. */ | |
110 | bool pressed; | |
111 | }; | |
112 | ||
113 | struct focaltech_data { | |
114 | unsigned int x_max, y_max; | |
115 | struct focaltech_hw_state state; | |
116 | }; | |
117 | ||
118 | static void focaltech_report_state(struct psmouse *psmouse) | |
119 | { | |
120 | struct focaltech_data *priv = psmouse->private; | |
121 | struct focaltech_hw_state *state = &priv->state; | |
122 | struct input_dev *dev = psmouse->dev; | |
123 | int i; | |
124 | ||
125 | for (i = 0; i < FOC_MAX_FINGERS; i++) { | |
126 | struct focaltech_finger_state *finger = &state->fingers[i]; | |
127 | bool active = finger->active && finger->valid; | |
128 | ||
129 | input_mt_slot(dev, i); | |
130 | input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); | |
131 | if (active) { | |
132 | input_report_abs(dev, ABS_MT_POSITION_X, finger->x); | |
133 | input_report_abs(dev, ABS_MT_POSITION_Y, | |
134 | FOC_MAX_Y - finger->y); | |
135 | } | |
136 | } | |
137 | input_mt_report_pointer_emulation(dev, true); | |
138 | ||
139 | input_report_key(psmouse->dev, BTN_LEFT, state->pressed); | |
140 | input_sync(psmouse->dev); | |
141 | } | |
142 | ||
143 | static void focaltech_process_touch_packet(struct psmouse *psmouse, | |
144 | unsigned char *packet) | |
145 | { | |
146 | struct focaltech_data *priv = psmouse->private; | |
147 | struct focaltech_hw_state *state = &priv->state; | |
148 | unsigned char fingers = packet[1]; | |
149 | int i; | |
150 | ||
151 | state->pressed = (packet[0] >> 4) & 1; | |
152 | ||
153 | /* the second byte contains a bitmap of all fingers touching the pad */ | |
154 | for (i = 0; i < FOC_MAX_FINGERS; i++) { | |
155 | state->fingers[i].active = fingers & 0x1; | |
156 | if (!state->fingers[i].active) { | |
157 | /* | |
158 | * Even when the finger becomes active again, we still | |
159 | * will have to wait for the first valid position. | |
160 | */ | |
161 | state->fingers[i].valid = false; | |
162 | } | |
163 | fingers >>= 1; | |
164 | } | |
165 | } | |
166 | ||
167 | static void focaltech_process_abs_packet(struct psmouse *psmouse, | |
168 | unsigned char *packet) | |
169 | { | |
170 | struct focaltech_data *priv = psmouse->private; | |
171 | struct focaltech_hw_state *state = &priv->state; | |
172 | unsigned int finger; | |
173 | ||
174 | finger = (packet[1] >> 4) - 1; | |
175 | if (finger >= FOC_MAX_FINGERS) { | |
176 | psmouse_err(psmouse, "Invalid finger in abs packet: %d\n", | |
177 | finger); | |
178 | return; | |
179 | } | |
180 | ||
181 | state->pressed = (packet[0] >> 4) & 1; | |
182 | ||
183 | /* | |
184 | * packet[5] contains some kind of tool size in the most | |
185 | * significant nibble. 0xff is a special value (latching) that | |
186 | * signals a large contact area. | |
187 | */ | |
188 | if (packet[5] == 0xff) { | |
189 | state->fingers[finger].valid = false; | |
190 | return; | |
191 | } | |
192 | ||
193 | state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2]; | |
194 | state->fingers[finger].y = (packet[3] << 8) | packet[4]; | |
195 | state->fingers[finger].valid = true; | |
196 | } | |
197 | ||
198 | static void focaltech_process_rel_packet(struct psmouse *psmouse, | |
199 | unsigned char *packet) | |
200 | { | |
201 | struct focaltech_data *priv = psmouse->private; | |
202 | struct focaltech_hw_state *state = &priv->state; | |
203 | int finger1, finger2; | |
204 | ||
205 | state->pressed = packet[0] >> 7; | |
206 | finger1 = ((packet[0] >> 4) & 0x7) - 1; | |
207 | if (finger1 < FOC_MAX_FINGERS) { | |
208 | state->fingers[finger1].x += (char)packet[1]; | |
209 | state->fingers[finger1].y += (char)packet[2]; | |
210 | } else { | |
211 | psmouse_err(psmouse, "First finger in rel packet invalid: %d\n", | |
212 | finger1); | |
213 | } | |
214 | ||
215 | /* | |
216 | * If there is an odd number of fingers, the last relative | |
217 | * packet only contains one finger. In this case, the second | |
218 | * finger index in the packet is 0 (we subtract 1 in the lines | |
219 | * above to create array indices, so the finger will overflow | |
220 | * and be above FOC_MAX_FINGERS). | |
221 | */ | |
222 | finger2 = ((packet[3] >> 4) & 0x7) - 1; | |
223 | if (finger2 < FOC_MAX_FINGERS) { | |
224 | state->fingers[finger2].x += (char)packet[4]; | |
225 | state->fingers[finger2].y += (char)packet[5]; | |
226 | } | |
227 | } | |
228 | ||
229 | static void focaltech_process_packet(struct psmouse *psmouse) | |
230 | { | |
231 | unsigned char *packet = psmouse->packet; | |
232 | ||
233 | switch (packet[0] & 0xf) { | |
234 | case FOC_TOUCH: | |
235 | focaltech_process_touch_packet(psmouse, packet); | |
236 | break; | |
237 | ||
238 | case FOC_ABS: | |
239 | focaltech_process_abs_packet(psmouse, packet); | |
240 | break; | |
241 | ||
242 | case FOC_REL: | |
243 | focaltech_process_rel_packet(psmouse, packet); | |
244 | break; | |
245 | ||
246 | default: | |
247 | psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]); | |
248 | break; | |
249 | } | |
250 | ||
251 | focaltech_report_state(psmouse); | |
252 | } | |
253 | ||
254 | static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse) | |
255 | { | |
256 | if (psmouse->pktcnt >= 6) { /* Full packet received */ | |
257 | focaltech_process_packet(psmouse); | |
258 | return PSMOUSE_FULL_PACKET; | |
259 | } | |
260 | ||
261 | /* | |
262 | * We might want to do some validation of the data here, but | |
263 | * we do not know the protocol well enough | |
264 | */ | |
265 | return PSMOUSE_GOOD_DATA; | |
266 | } | |
267 | ||
268 | static int focaltech_switch_protocol(struct psmouse *psmouse) | |
269 | { | |
270 | struct ps2dev *ps2dev = &psmouse->ps2dev; | |
271 | unsigned char param[3]; | |
272 | ||
273 | param[0] = 0; | |
274 | if (ps2_command(ps2dev, param, 0x10f8)) | |
275 | return -EIO; | |
276 | ||
277 | if (ps2_command(ps2dev, param, 0x10f8)) | |
278 | return -EIO; | |
279 | ||
280 | if (ps2_command(ps2dev, param, 0x10f8)) | |
281 | return -EIO; | |
282 | ||
283 | param[0] = 1; | |
284 | if (ps2_command(ps2dev, param, 0x10f8)) | |
285 | return -EIO; | |
286 | ||
287 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11)) | |
288 | return -EIO; | |
289 | ||
290 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE)) | |
291 | return -EIO; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static void focaltech_disconnect(struct psmouse *psmouse) | |
297 | { | |
298 | focaltech_reset(psmouse); | |
299 | kfree(psmouse->private); | |
300 | psmouse->private = NULL; | |
301 | } | |
302 | ||
303 | static int focaltech_reconnect(struct psmouse *psmouse) | |
304 | { | |
305 | int error; | |
306 | ||
307 | focaltech_reset(psmouse); | |
308 | ||
309 | error = focaltech_switch_protocol(psmouse); | |
310 | if (error) { | |
311 | psmouse_err(psmouse, "Unable to initialize the device\n"); | |
312 | return error; | |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static void focaltech_set_input_params(struct psmouse *psmouse) | |
319 | { | |
320 | struct input_dev *dev = psmouse->dev; | |
321 | struct focaltech_data *priv = psmouse->private; | |
322 | ||
323 | /* | |
324 | * Undo part of setup done for us by psmouse core since touchpad | |
325 | * is not a relative device. | |
326 | */ | |
327 | __clear_bit(EV_REL, dev->evbit); | |
328 | __clear_bit(REL_X, dev->relbit); | |
329 | __clear_bit(REL_Y, dev->relbit); | |
330 | __clear_bit(BTN_RIGHT, dev->keybit); | |
331 | __clear_bit(BTN_MIDDLE, dev->keybit); | |
332 | ||
333 | /* | |
334 | * Now set up our capabilities. | |
335 | */ | |
336 | __set_bit(EV_ABS, dev->evbit); | |
337 | input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0); | |
338 | input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0); | |
339 | input_mt_init_slots(dev, 5, INPUT_MT_POINTER); | |
340 | __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); | |
341 | } | |
342 | ||
343 | static int focaltech_read_register(struct ps2dev *ps2dev, int reg, | |
344 | unsigned char *param) | |
345 | { | |
346 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11)) | |
347 | return -EIO; | |
348 | ||
349 | param[0] = 0; | |
350 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) | |
351 | return -EIO; | |
352 | ||
353 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) | |
354 | return -EIO; | |
355 | ||
356 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) | |
357 | return -EIO; | |
358 | ||
359 | param[0] = reg; | |
360 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES)) | |
361 | return -EIO; | |
362 | ||
363 | if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) | |
364 | return -EIO; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | static int focaltech_read_size(struct psmouse *psmouse) | |
370 | { | |
371 | struct ps2dev *ps2dev = &psmouse->ps2dev; | |
372 | struct focaltech_data *priv = psmouse->private; | |
373 | char param[3]; | |
374 | ||
375 | if (focaltech_read_register(ps2dev, 2, param)) | |
376 | return -EIO; | |
377 | ||
378 | /* not sure whether this is 100% correct */ | |
379 | priv->x_max = (unsigned char)param[1] * 128; | |
380 | priv->y_max = (unsigned char)param[2] * 128; | |
381 | ||
382 | return 0; | |
383 | } | |
384 | int focaltech_init(struct psmouse *psmouse) | |
385 | { | |
386 | struct focaltech_data *priv; | |
387 | int error; | |
388 | ||
389 | psmouse->private = priv = kzalloc(sizeof(struct focaltech_data), | |
390 | GFP_KERNEL); | |
391 | if (!priv) | |
392 | return -ENOMEM; | |
393 | ||
394 | focaltech_reset(psmouse); | |
395 | ||
396 | error = focaltech_read_size(psmouse); | |
397 | if (error) { | |
398 | psmouse_err(psmouse, | |
399 | "Unable to read the size of the touchpad\n"); | |
400 | goto fail; | |
401 | } | |
402 | ||
403 | error = focaltech_switch_protocol(psmouse); | |
404 | if (error) { | |
405 | psmouse_err(psmouse, "Unable to initialize the device\n"); | |
406 | goto fail; | |
407 | } | |
408 | ||
409 | focaltech_set_input_params(psmouse); | |
410 | ||
411 | psmouse->protocol_handler = focaltech_process_byte; | |
412 | psmouse->pktsize = 6; | |
413 | psmouse->disconnect = focaltech_disconnect; | |
414 | psmouse->reconnect = focaltech_reconnect; | |
415 | psmouse->cleanup = focaltech_reset; | |
416 | /* resync is not supported yet */ | |
417 | psmouse->resync_time = 0; | |
3ace3686 HG |
418 | |
419 | return 0; | |
05be1d07 MG |
420 | |
421 | fail: | |
422 | focaltech_reset(psmouse); | |
423 | kfree(priv); | |
424 | return error; | |
3ace3686 | 425 | } |
05be1d07 MG |
426 | |
427 | bool focaltech_supported(void) | |
428 | { | |
429 | return true; | |
430 | } | |
431 | ||
432 | #else /* CONFIG_MOUSE_PS2_FOCALTECH */ | |
433 | ||
434 | int focaltech_init(struct psmouse *psmouse) | |
435 | { | |
436 | focaltech_reset(psmouse); | |
437 | ||
438 | return 0; | |
439 | } | |
440 | ||
441 | bool focaltech_supported(void) | |
442 | { | |
443 | return false; | |
444 | } | |
445 | ||
446 | #endif /* CONFIG_MOUSE_PS2_FOCALTECH */ |