Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * Focaltech TouchPad PS/2 mouse driver
4 : *
5 : * Copyright (c) 2014 Red Hat Inc.
6 : * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
7 : *
8 : * Red Hat authors:
9 : *
10 : * Hans de Goede <hdegoede@redhat.com>
11 : */
12 :
13 :
14 : #include <linux/device.h>
15 : #include <linux/libps2.h>
16 : #include <linux/input/mt.h>
17 : #include <linux/serio.h>
18 : #include <linux/slab.h>
19 : #include "psmouse.h"
20 : #include "focaltech.h"
21 :
22 : static const char * const focaltech_pnp_ids[] = {
23 : "FLT0101",
24 : "FLT0102",
25 : "FLT0103",
26 : NULL
27 : };
28 :
29 : /*
30 : * Even if the kernel is built without support for Focaltech PS/2 touchpads (or
31 : * when the real driver fails to recognize the device), we still have to detect
32 : * them in order to avoid further detection attempts confusing the touchpad.
33 : * This way it at least works in PS/2 mouse compatibility mode.
34 : */
35 0 : int focaltech_detect(struct psmouse *psmouse, bool set_properties)
36 : {
37 0 : if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))
38 : return -ENODEV;
39 :
40 0 : if (set_properties) {
41 0 : psmouse->vendor = "FocalTech";
42 0 : psmouse->name = "Touchpad";
43 : }
44 :
45 : return 0;
46 : }
47 :
48 : #ifdef CONFIG_MOUSE_PS2_FOCALTECH
49 :
50 : /*
51 : * Packet types - the numbers are not consecutive, so we might be missing
52 : * something here.
53 : */
54 : #define FOC_TOUCH 0x3 /* bitmap of active fingers */
55 : #define FOC_ABS 0x6 /* absolute position of one finger */
56 : #define FOC_REL 0x9 /* relative position of 1-2 fingers */
57 :
58 : #define FOC_MAX_FINGERS 5
59 :
60 : /*
61 : * Current state of a single finger on the touchpad.
62 : */
63 : struct focaltech_finger_state {
64 : /* The touchpad has generated a touch event for the finger */
65 : bool active;
66 :
67 : /*
68 : * The touchpad has sent position data for the finger. The
69 : * flag is 0 when the finger is not active, and there is a
70 : * time between the first touch event for the finger and the
71 : * following absolute position packet for the finger where the
72 : * touchpad has declared the finger to be valid, but we do not
73 : * have any valid position yet.
74 : */
75 : bool valid;
76 :
77 : /*
78 : * Absolute position (from the bottom left corner) of the
79 : * finger.
80 : */
81 : unsigned int x;
82 : unsigned int y;
83 : };
84 :
85 : /*
86 : * Description of the current state of the touchpad hardware.
87 : */
88 : struct focaltech_hw_state {
89 : /*
90 : * The touchpad tracks the positions of the fingers for us,
91 : * the array indices correspond to the finger indices returned
92 : * in the report packages.
93 : */
94 : struct focaltech_finger_state fingers[FOC_MAX_FINGERS];
95 :
96 : /*
97 : * Finger width 0-7 and 15 for a very big contact area.
98 : * 15 value stays until the finger is released.
99 : * Width is reported only in absolute packets.
100 : * Since hardware reports width only for last touching finger,
101 : * there is no need to store width for every specific finger,
102 : * so we keep only last value reported.
103 : */
104 : unsigned int width;
105 :
106 : /* True if the clickpad has been pressed. */
107 : bool pressed;
108 : };
109 :
110 : struct focaltech_data {
111 : unsigned int x_max, y_max;
112 : struct focaltech_hw_state state;
113 : };
114 :
115 0 : static void focaltech_report_state(struct psmouse *psmouse)
116 : {
117 0 : struct focaltech_data *priv = psmouse->private;
118 0 : struct focaltech_hw_state *state = &priv->state;
119 0 : struct input_dev *dev = psmouse->dev;
120 : int i;
121 :
122 0 : for (i = 0; i < FOC_MAX_FINGERS; i++) {
123 0 : struct focaltech_finger_state *finger = &state->fingers[i];
124 0 : bool active = finger->active && finger->valid;
125 :
126 0 : input_mt_slot(dev, i);
127 0 : input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
128 0 : if (active) {
129 : unsigned int clamped_x, clamped_y;
130 : /*
131 : * The touchpad might report invalid data, so we clamp
132 : * the resulting values so that we do not confuse
133 : * userspace.
134 : */
135 0 : clamped_x = clamp(finger->x, 0U, priv->x_max);
136 0 : clamped_y = clamp(finger->y, 0U, priv->y_max);
137 0 : input_report_abs(dev, ABS_MT_POSITION_X, clamped_x);
138 0 : input_report_abs(dev, ABS_MT_POSITION_Y,
139 0 : priv->y_max - clamped_y);
140 0 : input_report_abs(dev, ABS_TOOL_WIDTH, state->width);
141 : }
142 : }
143 0 : input_mt_report_pointer_emulation(dev, true);
144 :
145 0 : input_report_key(dev, BTN_LEFT, state->pressed);
146 0 : input_sync(dev);
147 0 : }
148 :
149 : static void focaltech_process_touch_packet(struct psmouse *psmouse,
150 : unsigned char *packet)
151 : {
152 0 : struct focaltech_data *priv = psmouse->private;
153 0 : struct focaltech_hw_state *state = &priv->state;
154 0 : unsigned char fingers = packet[1];
155 : int i;
156 :
157 0 : state->pressed = (packet[0] >> 4) & 1;
158 :
159 : /* the second byte contains a bitmap of all fingers touching the pad */
160 0 : for (i = 0; i < FOC_MAX_FINGERS; i++) {
161 0 : state->fingers[i].active = fingers & 0x1;
162 0 : if (!state->fingers[i].active) {
163 : /*
164 : * Even when the finger becomes active again, we still
165 : * will have to wait for the first valid position.
166 : */
167 0 : state->fingers[i].valid = false;
168 : }
169 0 : fingers >>= 1;
170 : }
171 : }
172 :
173 0 : static void focaltech_process_abs_packet(struct psmouse *psmouse,
174 : unsigned char *packet)
175 : {
176 0 : struct focaltech_data *priv = psmouse->private;
177 0 : struct focaltech_hw_state *state = &priv->state;
178 : unsigned int finger;
179 :
180 0 : finger = (packet[1] >> 4) - 1;
181 0 : if (finger >= FOC_MAX_FINGERS) {
182 0 : psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
183 : finger);
184 : return;
185 : }
186 :
187 0 : state->pressed = (packet[0] >> 4) & 1;
188 :
189 0 : state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
190 0 : state->fingers[finger].y = (packet[3] << 8) | packet[4];
191 0 : state->width = packet[5] >> 4;
192 0 : state->fingers[finger].valid = true;
193 : }
194 :
195 0 : static void focaltech_process_rel_packet(struct psmouse *psmouse,
196 : unsigned char *packet)
197 : {
198 0 : struct focaltech_data *priv = psmouse->private;
199 0 : struct focaltech_hw_state *state = &priv->state;
200 : int finger1, finger2;
201 :
202 0 : state->pressed = packet[0] >> 7;
203 0 : finger1 = ((packet[0] >> 4) & 0x7) - 1;
204 0 : if (finger1 < FOC_MAX_FINGERS) {
205 0 : state->fingers[finger1].x += (s8)packet[1];
206 0 : state->fingers[finger1].y += (s8)packet[2];
207 : } else {
208 0 : psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
209 : finger1);
210 : }
211 :
212 : /*
213 : * If there is an odd number of fingers, the last relative
214 : * packet only contains one finger. In this case, the second
215 : * finger index in the packet is 0 (we subtract 1 in the lines
216 : * above to create array indices, so the finger will overflow
217 : * and be above FOC_MAX_FINGERS).
218 : */
219 0 : finger2 = ((packet[3] >> 4) & 0x7) - 1;
220 0 : if (finger2 < FOC_MAX_FINGERS) {
221 0 : state->fingers[finger2].x += (s8)packet[4];
222 0 : state->fingers[finger2].y += (s8)packet[5];
223 : }
224 0 : }
225 :
226 0 : static void focaltech_process_packet(struct psmouse *psmouse)
227 : {
228 0 : unsigned char *packet = psmouse->packet;
229 :
230 0 : switch (packet[0] & 0xf) {
231 : case FOC_TOUCH:
232 0 : focaltech_process_touch_packet(psmouse, packet);
233 : break;
234 :
235 : case FOC_ABS:
236 0 : focaltech_process_abs_packet(psmouse, packet);
237 0 : break;
238 :
239 : case FOC_REL:
240 0 : focaltech_process_rel_packet(psmouse, packet);
241 0 : break;
242 :
243 : default:
244 0 : psmouse_err(psmouse, "Unknown packet type: %02x\n", packet[0]);
245 0 : break;
246 : }
247 :
248 0 : focaltech_report_state(psmouse);
249 0 : }
250 :
251 0 : static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
252 : {
253 0 : if (psmouse->pktcnt >= 6) { /* Full packet received */
254 0 : focaltech_process_packet(psmouse);
255 0 : return PSMOUSE_FULL_PACKET;
256 : }
257 :
258 : /*
259 : * We might want to do some validation of the data here, but
260 : * we do not know the protocol well enough
261 : */
262 : return PSMOUSE_GOOD_DATA;
263 : }
264 :
265 0 : static int focaltech_switch_protocol(struct psmouse *psmouse)
266 : {
267 0 : struct ps2dev *ps2dev = &psmouse->ps2dev;
268 : unsigned char param[3];
269 :
270 0 : param[0] = 0;
271 0 : if (ps2_command(ps2dev, param, 0x10f8))
272 : return -EIO;
273 :
274 0 : if (ps2_command(ps2dev, param, 0x10f8))
275 : return -EIO;
276 :
277 0 : if (ps2_command(ps2dev, param, 0x10f8))
278 : return -EIO;
279 :
280 0 : param[0] = 1;
281 0 : if (ps2_command(ps2dev, param, 0x10f8))
282 : return -EIO;
283 :
284 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
285 : return -EIO;
286 :
287 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
288 : return -EIO;
289 :
290 0 : return 0;
291 : }
292 :
293 0 : static void focaltech_reset(struct psmouse *psmouse)
294 : {
295 0 : ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
296 0 : psmouse_reset(psmouse);
297 0 : }
298 :
299 0 : static void focaltech_disconnect(struct psmouse *psmouse)
300 : {
301 0 : focaltech_reset(psmouse);
302 0 : kfree(psmouse->private);
303 0 : psmouse->private = NULL;
304 0 : }
305 :
306 0 : static int focaltech_reconnect(struct psmouse *psmouse)
307 : {
308 : int error;
309 :
310 0 : focaltech_reset(psmouse);
311 :
312 0 : error = focaltech_switch_protocol(psmouse);
313 0 : if (error) {
314 0 : psmouse_err(psmouse, "Unable to initialize the device\n");
315 0 : return error;
316 : }
317 :
318 : return 0;
319 : }
320 :
321 0 : static void focaltech_set_input_params(struct psmouse *psmouse)
322 : {
323 0 : struct input_dev *dev = psmouse->dev;
324 0 : struct focaltech_data *priv = psmouse->private;
325 :
326 : /*
327 : * Undo part of setup done for us by psmouse core since touchpad
328 : * is not a relative device.
329 : */
330 0 : __clear_bit(EV_REL, dev->evbit);
331 0 : __clear_bit(REL_X, dev->relbit);
332 0 : __clear_bit(REL_Y, dev->relbit);
333 0 : __clear_bit(BTN_RIGHT, dev->keybit);
334 0 : __clear_bit(BTN_MIDDLE, dev->keybit);
335 :
336 : /*
337 : * Now set up our capabilities.
338 : */
339 0 : __set_bit(EV_ABS, dev->evbit);
340 0 : input_set_abs_params(dev, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
341 0 : input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
342 0 : input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
343 0 : input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
344 0 : __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
345 0 : }
346 :
347 0 : static int focaltech_read_register(struct ps2dev *ps2dev, int reg,
348 : unsigned char *param)
349 : {
350 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
351 : return -EIO;
352 :
353 0 : param[0] = 0;
354 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
355 : return -EIO;
356 :
357 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
358 : return -EIO;
359 :
360 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
361 : return -EIO;
362 :
363 0 : param[0] = reg;
364 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
365 : return -EIO;
366 :
367 0 : if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
368 : return -EIO;
369 :
370 0 : return 0;
371 : }
372 :
373 0 : static int focaltech_read_size(struct psmouse *psmouse)
374 : {
375 0 : struct ps2dev *ps2dev = &psmouse->ps2dev;
376 0 : struct focaltech_data *priv = psmouse->private;
377 : char param[3];
378 :
379 0 : if (focaltech_read_register(ps2dev, 2, param))
380 : return -EIO;
381 :
382 : /* not sure whether this is 100% correct */
383 0 : priv->x_max = (unsigned char)param[1] * 128;
384 0 : priv->y_max = (unsigned char)param[2] * 128;
385 :
386 0 : return 0;
387 : }
388 :
389 0 : static void focaltech_set_resolution(struct psmouse *psmouse,
390 : unsigned int resolution)
391 : {
392 : /* not supported yet */
393 0 : }
394 :
395 0 : static void focaltech_set_rate(struct psmouse *psmouse, unsigned int rate)
396 : {
397 : /* not supported yet */
398 0 : }
399 :
400 0 : static void focaltech_set_scale(struct psmouse *psmouse,
401 : enum psmouse_scale scale)
402 : {
403 : /* not supported yet */
404 0 : }
405 :
406 0 : int focaltech_init(struct psmouse *psmouse)
407 : {
408 : struct focaltech_data *priv;
409 : int error;
410 :
411 0 : psmouse->private = priv = kzalloc(sizeof(struct focaltech_data),
412 : GFP_KERNEL);
413 0 : if (!priv)
414 : return -ENOMEM;
415 :
416 0 : focaltech_reset(psmouse);
417 :
418 0 : error = focaltech_read_size(psmouse);
419 0 : if (error) {
420 0 : psmouse_err(psmouse,
421 : "Unable to read the size of the touchpad\n");
422 0 : goto fail;
423 : }
424 :
425 0 : error = focaltech_switch_protocol(psmouse);
426 0 : if (error) {
427 0 : psmouse_err(psmouse, "Unable to initialize the device\n");
428 0 : goto fail;
429 : }
430 :
431 0 : focaltech_set_input_params(psmouse);
432 :
433 0 : psmouse->protocol_handler = focaltech_process_byte;
434 0 : psmouse->pktsize = 6;
435 0 : psmouse->disconnect = focaltech_disconnect;
436 0 : psmouse->reconnect = focaltech_reconnect;
437 0 : psmouse->cleanup = focaltech_reset;
438 : /* resync is not supported yet */
439 0 : psmouse->resync_time = 0;
440 : /*
441 : * rate/resolution/scale changes are not supported yet, and
442 : * the generic implementations of these functions seem to
443 : * confuse some touchpads
444 : */
445 0 : psmouse->set_resolution = focaltech_set_resolution;
446 0 : psmouse->set_rate = focaltech_set_rate;
447 0 : psmouse->set_scale = focaltech_set_scale;
448 :
449 0 : return 0;
450 :
451 : fail:
452 0 : focaltech_reset(psmouse);
453 0 : kfree(priv);
454 0 : return error;
455 : }
456 : #endif /* CONFIG_MOUSE_PS2_FOCALTECH */
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