Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * Stephen Evanchik <evanchsa@gmail.com>
4 : *
5 : * Trademarks are the property of their respective owners.
6 : */
7 :
8 : #include <linux/slab.h>
9 : #include <linux/delay.h>
10 : #include <linux/serio.h>
11 : #include <linux/module.h>
12 : #include <linux/input.h>
13 : #include <linux/libps2.h>
14 : #include <linux/proc_fs.h>
15 : #include <linux/uaccess.h>
16 : #include "psmouse.h"
17 : #include "trackpoint.h"
18 :
19 : static const char * const trackpoint_variants[] = {
20 : [TP_VARIANT_IBM] = "IBM",
21 : [TP_VARIANT_ALPS] = "ALPS",
22 : [TP_VARIANT_ELAN] = "Elan",
23 : [TP_VARIANT_NXP] = "NXP",
24 : [TP_VARIANT_JYT_SYNAPTICS] = "JYT_Synaptics",
25 : [TP_VARIANT_SYNAPTICS] = "Synaptics",
26 : };
27 :
28 : /*
29 : * Power-on Reset: Resets all trackpoint parameters, including RAM values,
30 : * to defaults.
31 : * Returns zero on success, non-zero on failure.
32 : */
33 0 : static int trackpoint_power_on_reset(struct ps2dev *ps2dev)
34 : {
35 0 : u8 param[2] = { TP_POR };
36 : int err;
37 :
38 0 : err = ps2_command(ps2dev, param, MAKE_PS2_CMD(1, 2, TP_COMMAND));
39 0 : if (err)
40 : return err;
41 :
42 : /* Check for success response -- 0xAA00 */
43 0 : if (param[0] != 0xAA || param[1] != 0x00)
44 : return -ENODEV;
45 :
46 0 : return 0;
47 : }
48 :
49 : /*
50 : * Device IO: read, write and toggle bit
51 : */
52 : static int trackpoint_read(struct ps2dev *ps2dev, u8 loc, u8 *results)
53 : {
54 0 : results[0] = loc;
55 :
56 0 : return ps2_command(ps2dev, results, MAKE_PS2_CMD(1, 1, TP_COMMAND));
57 : }
58 :
59 : static int trackpoint_write(struct ps2dev *ps2dev, u8 loc, u8 val)
60 : {
61 0 : u8 param[3] = { TP_WRITE_MEM, loc, val };
62 :
63 0 : return ps2_command(ps2dev, param, MAKE_PS2_CMD(3, 0, TP_COMMAND));
64 : }
65 :
66 : static int trackpoint_toggle_bit(struct ps2dev *ps2dev, u8 loc, u8 mask)
67 : {
68 0 : u8 param[3] = { TP_TOGGLE, loc, mask };
69 :
70 : /* Bad things will happen if the loc param isn't in this range */
71 0 : if (loc < 0x20 || loc >= 0x2F)
72 : return -EINVAL;
73 :
74 0 : return ps2_command(ps2dev, param, MAKE_PS2_CMD(3, 0, TP_COMMAND));
75 : }
76 :
77 0 : static int trackpoint_update_bit(struct ps2dev *ps2dev,
78 : u8 loc, u8 mask, u8 value)
79 : {
80 : int retval;
81 : u8 data;
82 :
83 0 : retval = trackpoint_read(ps2dev, loc, &data);
84 0 : if (retval)
85 : return retval;
86 :
87 0 : if (((data & mask) == mask) != !!value)
88 0 : retval = trackpoint_toggle_bit(ps2dev, loc, mask);
89 :
90 : return retval;
91 : }
92 :
93 : /*
94 : * Trackpoint-specific attributes
95 : */
96 : struct trackpoint_attr_data {
97 : size_t field_offset;
98 : u8 command;
99 : u8 mask;
100 : bool inverted;
101 : u8 power_on_default;
102 : };
103 :
104 0 : static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse,
105 : void *data, char *buf)
106 : {
107 0 : struct trackpoint_data *tp = psmouse->private;
108 0 : struct trackpoint_attr_data *attr = data;
109 0 : u8 value = *(u8 *)((void *)tp + attr->field_offset);
110 :
111 0 : if (attr->inverted)
112 0 : value = !value;
113 :
114 0 : return sprintf(buf, "%u\n", value);
115 : }
116 :
117 0 : static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data,
118 : const char *buf, size_t count)
119 : {
120 0 : struct trackpoint_data *tp = psmouse->private;
121 0 : struct trackpoint_attr_data *attr = data;
122 0 : u8 *field = (void *)tp + attr->field_offset;
123 : u8 value;
124 : int err;
125 :
126 0 : err = kstrtou8(buf, 10, &value);
127 0 : if (err)
128 0 : return err;
129 :
130 0 : *field = value;
131 0 : err = trackpoint_write(&psmouse->ps2dev, attr->command, value);
132 :
133 0 : return err ?: count;
134 : }
135 :
136 : #define TRACKPOINT_INT_ATTR(_name, _command, _default) \
137 : static struct trackpoint_attr_data trackpoint_attr_##_name = { \
138 : .field_offset = offsetof(struct trackpoint_data, _name), \
139 : .command = _command, \
140 : .power_on_default = _default, \
141 : }; \
142 : PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
143 : &trackpoint_attr_##_name, \
144 : trackpoint_show_int_attr, trackpoint_set_int_attr)
145 :
146 0 : static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data,
147 : const char *buf, size_t count)
148 : {
149 0 : struct trackpoint_data *tp = psmouse->private;
150 0 : struct trackpoint_attr_data *attr = data;
151 0 : bool *field = (void *)tp + attr->field_offset;
152 : bool value;
153 : int err;
154 :
155 0 : err = kstrtobool(buf, &value);
156 0 : if (err)
157 0 : return err;
158 :
159 0 : if (attr->inverted)
160 0 : value = !value;
161 :
162 0 : if (*field != value) {
163 0 : *field = value;
164 0 : err = trackpoint_toggle_bit(&psmouse->ps2dev,
165 0 : attr->command, attr->mask);
166 : }
167 :
168 0 : return err ?: count;
169 : }
170 :
171 :
172 : #define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv, _default) \
173 : static struct trackpoint_attr_data trackpoint_attr_##_name = { \
174 : .field_offset = offsetof(struct trackpoint_data, \
175 : _name), \
176 : .command = _command, \
177 : .mask = _mask, \
178 : .inverted = _inv, \
179 : .power_on_default = _default, \
180 : }; \
181 : PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \
182 : &trackpoint_attr_##_name, \
183 : trackpoint_show_int_attr, trackpoint_set_bit_attr)
184 :
185 : TRACKPOINT_INT_ATTR(sensitivity, TP_SENS, TP_DEF_SENS);
186 : TRACKPOINT_INT_ATTR(speed, TP_SPEED, TP_DEF_SPEED);
187 : TRACKPOINT_INT_ATTR(inertia, TP_INERTIA, TP_DEF_INERTIA);
188 : TRACKPOINT_INT_ATTR(reach, TP_REACH, TP_DEF_REACH);
189 : TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS, TP_DEF_DRAGHYS);
190 : TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG, TP_DEF_MINDRAG);
191 : TRACKPOINT_INT_ATTR(thresh, TP_THRESH, TP_DEF_THRESH);
192 : TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH, TP_DEF_UP_THRESH);
193 : TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME, TP_DEF_Z_TIME);
194 : TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV, TP_DEF_JENKS_CURV);
195 : TRACKPOINT_INT_ATTR(drift_time, TP_DRIFT_TIME, TP_DEF_DRIFT_TIME);
196 :
197 : TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, false,
198 : TP_DEF_PTSON);
199 : TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, false,
200 : TP_DEF_SKIPBACK);
201 : TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, true,
202 : TP_DEF_EXT_DEV);
203 :
204 : static bool trackpoint_is_attr_available(struct psmouse *psmouse,
205 : struct attribute *attr)
206 : {
207 0 : struct trackpoint_data *tp = psmouse->private;
208 :
209 0 : return tp->variant_id == TP_VARIANT_IBM ||
210 0 : attr == &psmouse_attr_sensitivity.dattr.attr ||
211 : attr == &psmouse_attr_press_to_select.dattr.attr;
212 : }
213 :
214 0 : static umode_t trackpoint_is_attr_visible(struct kobject *kobj,
215 : struct attribute *attr, int n)
216 : {
217 0 : struct device *dev = kobj_to_dev(kobj);
218 0 : struct serio *serio = to_serio_port(dev);
219 0 : struct psmouse *psmouse = psmouse_from_serio(serio);
220 :
221 0 : return trackpoint_is_attr_available(psmouse, attr) ? attr->mode : 0;
222 : }
223 :
224 : static struct attribute *trackpoint_attrs[] = {
225 : &psmouse_attr_sensitivity.dattr.attr,
226 : &psmouse_attr_speed.dattr.attr,
227 : &psmouse_attr_inertia.dattr.attr,
228 : &psmouse_attr_reach.dattr.attr,
229 : &psmouse_attr_draghys.dattr.attr,
230 : &psmouse_attr_mindrag.dattr.attr,
231 : &psmouse_attr_thresh.dattr.attr,
232 : &psmouse_attr_upthresh.dattr.attr,
233 : &psmouse_attr_ztime.dattr.attr,
234 : &psmouse_attr_jenks.dattr.attr,
235 : &psmouse_attr_drift_time.dattr.attr,
236 : &psmouse_attr_press_to_select.dattr.attr,
237 : &psmouse_attr_skipback.dattr.attr,
238 : &psmouse_attr_ext_dev.dattr.attr,
239 : NULL
240 : };
241 :
242 : static struct attribute_group trackpoint_attr_group = {
243 : .is_visible = trackpoint_is_attr_visible,
244 : .attrs = trackpoint_attrs,
245 : };
246 :
247 : #define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \
248 : do { \
249 : struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \
250 : \
251 : if ((!_power_on || _tp->_name != _attr->power_on_default) && \
252 : trackpoint_is_attr_available(_psmouse, \
253 : &psmouse_attr_##_name.dattr.attr)) { \
254 : if (!_attr->mask) \
255 : trackpoint_write(&_psmouse->ps2dev, \
256 : _attr->command, _tp->_name); \
257 : else \
258 : trackpoint_update_bit(&_psmouse->ps2dev, \
259 : _attr->command, _attr->mask, \
260 : _tp->_name); \
261 : } \
262 : } while (0)
263 :
264 : #define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \
265 : do { \
266 : _tp->_name = trackpoint_attr_##_name.power_on_default; \
267 : } while (0)
268 :
269 0 : static int trackpoint_start_protocol(struct psmouse *psmouse,
270 : u8 *variant_id, u8 *firmware_id)
271 : {
272 0 : u8 param[2] = { 0 };
273 : int error;
274 :
275 0 : error = ps2_command(&psmouse->ps2dev,
276 : param, MAKE_PS2_CMD(0, 2, TP_READ_ID));
277 0 : if (error)
278 : return error;
279 :
280 0 : switch (param[0]) {
281 : case TP_VARIANT_IBM:
282 : case TP_VARIANT_ALPS:
283 : case TP_VARIANT_ELAN:
284 : case TP_VARIANT_NXP:
285 : case TP_VARIANT_JYT_SYNAPTICS:
286 : case TP_VARIANT_SYNAPTICS:
287 0 : if (variant_id)
288 0 : *variant_id = param[0];
289 0 : if (firmware_id)
290 0 : *firmware_id = param[1];
291 : return 0;
292 : }
293 :
294 : return -ENODEV;
295 : }
296 :
297 : /*
298 : * Write parameters to trackpad.
299 : * in_power_on_state: Set to true if TP is in default / power-on state (ex. if
300 : * power-on reset was run). If so, values will only be
301 : * written to TP if they differ from power-on default.
302 : */
303 0 : static int trackpoint_sync(struct psmouse *psmouse, bool in_power_on_state)
304 : {
305 0 : struct trackpoint_data *tp = psmouse->private;
306 :
307 0 : if (!in_power_on_state && tp->variant_id == TP_VARIANT_IBM) {
308 : /*
309 : * Disable features that may make device unusable
310 : * with this driver.
311 : */
312 0 : trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND,
313 : TP_MASK_TWOHAND, TP_DEF_TWOHAND);
314 :
315 0 : trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG,
316 : TP_MASK_SOURCE_TAG, TP_DEF_SOURCE_TAG);
317 :
318 0 : trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_MB,
319 : TP_MASK_MB, TP_DEF_MB);
320 : }
321 :
322 : /*
323 : * These properties can be changed in this driver. Only
324 : * configure them if the values are non-default or if the TP is in
325 : * an unknown state.
326 : */
327 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, sensitivity);
328 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, inertia);
329 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, speed);
330 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, reach);
331 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, draghys);
332 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, mindrag);
333 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, thresh);
334 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, upthresh);
335 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ztime);
336 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, jenks);
337 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, drift_time);
338 :
339 : /* toggles */
340 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, press_to_select);
341 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, skipback);
342 0 : TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ext_dev);
343 :
344 0 : return 0;
345 : }
346 :
347 0 : static void trackpoint_defaults(struct trackpoint_data *tp)
348 : {
349 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, sensitivity);
350 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, speed);
351 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, reach);
352 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, draghys);
353 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, mindrag);
354 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, thresh);
355 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, upthresh);
356 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ztime);
357 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, jenks);
358 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, drift_time);
359 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, inertia);
360 :
361 : /* toggles */
362 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, press_to_select);
363 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, skipback);
364 0 : TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ext_dev);
365 0 : }
366 :
367 0 : static void trackpoint_disconnect(struct psmouse *psmouse)
368 : {
369 0 : device_remove_group(&psmouse->ps2dev.serio->dev,
370 : &trackpoint_attr_group);
371 :
372 0 : kfree(psmouse->private);
373 0 : psmouse->private = NULL;
374 0 : }
375 :
376 0 : static int trackpoint_reconnect(struct psmouse *psmouse)
377 : {
378 0 : struct trackpoint_data *tp = psmouse->private;
379 : int error;
380 : bool was_reset;
381 :
382 0 : error = trackpoint_start_protocol(psmouse, NULL, NULL);
383 0 : if (error)
384 : return error;
385 :
386 0 : was_reset = tp->variant_id == TP_VARIANT_IBM &&
387 0 : trackpoint_power_on_reset(&psmouse->ps2dev) == 0;
388 :
389 0 : error = trackpoint_sync(psmouse, was_reset);
390 0 : if (error)
391 : return error;
392 :
393 0 : return 0;
394 : }
395 :
396 0 : int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
397 : {
398 0 : struct ps2dev *ps2dev = &psmouse->ps2dev;
399 : struct trackpoint_data *tp;
400 : u8 variant_id;
401 : u8 firmware_id;
402 : u8 button_info;
403 : int error;
404 :
405 0 : error = trackpoint_start_protocol(psmouse, &variant_id, &firmware_id);
406 0 : if (error)
407 : return error;
408 :
409 0 : if (!set_properties)
410 : return 0;
411 :
412 0 : tp = kzalloc(sizeof(*tp), GFP_KERNEL);
413 0 : if (!tp)
414 : return -ENOMEM;
415 :
416 0 : trackpoint_defaults(tp);
417 0 : tp->variant_id = variant_id;
418 0 : tp->firmware_id = firmware_id;
419 :
420 0 : psmouse->private = tp;
421 :
422 0 : psmouse->vendor = trackpoint_variants[variant_id];
423 0 : psmouse->name = "TrackPoint";
424 :
425 0 : psmouse->reconnect = trackpoint_reconnect;
426 0 : psmouse->disconnect = trackpoint_disconnect;
427 :
428 0 : if (variant_id != TP_VARIANT_IBM) {
429 : /* Newer variants do not support extended button query. */
430 0 : button_info = 0x33;
431 : } else {
432 0 : error = trackpoint_read(ps2dev, TP_EXT_BTN, &button_info);
433 0 : if (error) {
434 0 : psmouse_warn(psmouse,
435 : "failed to get extended button data, assuming 3 buttons\n");
436 0 : button_info = 0x33;
437 0 : } else if (!button_info) {
438 0 : psmouse_warn(psmouse,
439 : "got 0 in extended button data, assuming 3 buttons\n");
440 0 : button_info = 0x33;
441 : }
442 : }
443 :
444 0 : if ((button_info & 0x0f) >= 3)
445 0 : input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
446 :
447 0 : __set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit);
448 0 : __set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);
449 :
450 0 : if (variant_id != TP_VARIANT_IBM ||
451 0 : trackpoint_power_on_reset(ps2dev) != 0) {
452 : /*
453 : * Write defaults to TP if we did not reset the trackpoint.
454 : */
455 0 : trackpoint_sync(psmouse, false);
456 : }
457 :
458 0 : error = device_add_group(&ps2dev->serio->dev, &trackpoint_attr_group);
459 0 : if (error) {
460 0 : psmouse_err(psmouse,
461 : "failed to create sysfs attributes, error: %d\n",
462 : error);
463 0 : kfree(psmouse->private);
464 0 : psmouse->private = NULL;
465 0 : return -1;
466 : }
467 :
468 0 : psmouse_info(psmouse,
469 : "%s TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
470 : psmouse->vendor, firmware_id,
471 : (button_info & 0xf0) >> 4, button_info & 0x0f);
472 :
473 0 : return 0;
474 : }
475 :
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