summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/input/iqs269a.yaml
blob: 3c430d38594f111126268f54774aaa4469fe1754 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/iqs269a.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Azoteq IQS269A Capacitive Touch Controller

maintainers:
  - Jeff LaBundy <jeff@labundy.com>

description: |
  The Azoteq IQS269A is an 8-channel capacitive touch controller that features
  additional Hall-effect and inductive sensing capabilities.

  Link to datasheet: https://www.azoteq.com/

properties:
  compatible:
    const: azoteq,iqs269a

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  "#address-cells":
    const: 1

  "#size-cells":
    const: 0

  azoteq,hall-enable:
    type: boolean
    description:
      Enables Hall-effect sensing on channels 6 and 7. In this case, keycodes
      assigned to channel 6 are ignored and keycodes assigned to channel 7 are
      interpreted as switch codes. Refer to the datasheet for requirements im-
      posed on channels 6 and 7 by Hall-effect sensing.

  azoteq,suspend-mode:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description: |
      Specifies the power mode during suspend as follows:
      0: Automatic (same as normal runtime, i.e. suspend/resume disabled)
      1: Low power (all sensing at a reduced reporting rate)
      2: Ultra-low power (channel 0 proximity sensing)
      3: Halt (no sensing)

  azoteq,clk-div:
    type: boolean
    description: Divides the device's core clock by a factor of 4.

  azoteq,ulp-update:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 7
    default: 3
    description: Specifies the ultra-low-power mode update rate.

  azoteq,reseed-offset:
    type: boolean
    description:
      Applies an 8-count offset to all long-term averages upon either ATI or
      reseed events.

  azoteq,filt-str-lp-lta:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description:
      Specifies the long-term average filter strength during low-power mode.

  azoteq,filt-str-lp-cnt:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description:
      Specifies the raw count filter strength during low-power mode.

  azoteq,filt-str-np-lta:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description:
      Specifies the long-term average filter strength during normal-power mode.

  azoteq,filt-str-np-cnt:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description:
      Specifies the raw count filter strength during normal-power mode.

  azoteq,rate-np-ms:
    minimum: 0
    maximum: 255
    default: 16
    description: Specifies the report rate (in ms) during normal-power mode.

  azoteq,rate-lp-ms:
    minimum: 0
    maximum: 255
    default: 160
    description: Specifies the report rate (in ms) during low-power mode.

  azoteq,rate-ulp-ms:
    multipleOf: 16
    minimum: 0
    maximum: 4080
    default: 160
    description: Specifies the report rate (in ms) during ultra-low-power mode.

  azoteq,timeout-pwr-ms:
    multipleOf: 512
    minimum: 0
    maximum: 130560
    default: 2560
    description:
      Specifies the length of time (in ms) to wait for an event during normal-
      power mode before transitioning to low-power mode.

  azoteq,timeout-lta-ms:
    multipleOf: 512
    minimum: 0
    maximum: 130560
    default: 32768
    description:
      Specifies the length of time (in ms) to wait before resetting the long-
      term average of all channels. Specify the maximum timeout to disable it
      altogether.

  azoteq,ati-band-disable:
    type: boolean
    description: Disables the ATI band check.

  azoteq,ati-lp-only:
    type: boolean
    description: Limits automatic ATI to low-power mode.

  azoteq,ati-band-tighten:
    type: boolean
    description: Tightens the ATI band from 1/8 to 1/16 of the desired target.

  azoteq,filt-disable:
    type: boolean
    description: Disables all raw count filtering.

  azoteq,gpio3-select:
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 7
    default: 0
    description:
      Selects the channel for which the GPIO3 pin represents touch state.

  azoteq,dual-direction:
    type: boolean
    description:
      Specifies that long-term averages are to freeze in the presence of either
      increasing or decreasing counts, thereby permitting events to be reported
      in either direction.

  azoteq,tx-freq:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description: |
      Specifies the inductive sensing excitation frequency as follows (paren-
      thesized numbers represent the frequency if 'azoteq,clk-div' is present):
      0: 16 MHz (4 MHz)
      1: 8 MHz (2 MHz)
      2: 4 MHz (1 MHz)
      3: 2 MHz (500 kHz)

  azoteq,global-cap-increase:
    type: boolean
    description: Increases the global capacitance adder from 0.5 pF to 1.5 pF.

  azoteq,reseed-select:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description: |
      Specifies the event(s) that prompt the device to reseed (i.e. reset the
      long-term average) of an associated channel as follows:
      0: None
      1: Proximity
      2: Proximity or touch
      3: Proximity, touch or deep touch

  azoteq,tracking-enable:
    type: boolean
    description:
      Enables all associated channels to track their respective reference
      channels.

  azoteq,filt-str-slider:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 1
    description: Specifies the slider coordinate filter strength.

patternProperties:
  "^channel@[0-7]$":
    type: object
    description:
      Represents a single sensing channel. A channel is active if defined and
      inactive otherwise.

    properties:
      reg:
        minimum: 0
        maximum: 7
        description: Index of the channel.

      azoteq,reseed-disable:
        type: boolean
        description:
          Prevents the channel from being reseeded if the long-term average
          timeout (defined in 'azoteq,timeout-lta') expires.

      azoteq,blocking-enable:
        type: boolean
        description: Specifies that the channel is a blocking channel.

      azoteq,slider0-select:
        type: boolean
        description: Specifies that the channel participates in slider 0.

      azoteq,slider1-select:
        type: boolean
        description: Specifies that the channel participates in slider 1.

      azoteq,rx-enable:
        $ref: /schemas/types.yaml#/definitions/uint32-array
        minItems: 1
        maxItems: 8
        items:
          minimum: 0
          maximum: 7
        description:
          Specifies the CRX pin(s) associated with the channel. By default, only
          the CRX pin corresponding to the channel's index is enabled (e.g. CRX0
          for channel 0).

      azoteq,tx-enable:
        $ref: /schemas/types.yaml#/definitions/uint32-array
        minItems: 1
        maxItems: 8
        items:
          minimum: 0
          maximum: 7
        default: [0, 1, 2, 3, 4, 5, 6, 7]
        description: Specifies the TX pin(s) associated with the channel.

      azoteq,meas-cap-decrease:
        type: boolean
        description:
          Decreases the internal measurement capacitance from 60 pF to 15 pF.

      azoteq,rx-float-inactive:
        type: boolean
        description: Floats any inactive CRX pins instead of grounding them.

      azoteq,local-cap-size:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2]
        default: 0
        description: |
          Specifies the capacitance to be added to the channel as follows:
          0: None
          1: Global adder (based on 'azoteq,global-cap-increase')
          2: Global adder + 0.5 pF

      azoteq,invert-enable:
        type: boolean
        description:
          Inverts the polarity of the states reported for proximity, touch and
          deep-touch events relative to their respective thresholds.

      azoteq,proj-bias:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2, 3]
        default: 2
        description: |
          Specifies the bias current applied during projected-capacitance
          sensing as follows:
          0: 2.5 uA
          1: 5 uA
          2: 10 uA
          3: 20 uA

      azoteq,sense-mode:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 9, 14, 15]
        default: 0
        description: |
          Specifies the channel's sensing mode as follows:
          0:  Self capacitance
          1:  Projected capacitance
          9:  Self or mutual inductance
          14: Hall effect
          15: Temperature

      azoteq,sense-freq:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2, 3]
        default: 1
        description: |
          Specifies the channel's sensing frequency as follows (parenthesized
          numbers represent the frequency if 'azoteq,clk-div' is present):
          0: 4 MHz (1 MHz)
          1: 2 MHz (500 kHz)
          2: 1 MHz (250 kHz)
          3: 500 kHz (125 kHz)

      azoteq,static-enable:
        type: boolean
        description: Enables the static front-end for the channel.

      azoteq,ati-mode:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1, 2, 3]
        default: 3
        description: |
          Specifies the channel's ATI mode as follows:
          0: Disabled
          1: Semi-partial
          2: Partial
          3: Full

      azoteq,ati-base:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [75, 100, 150, 200]
        default: 100
        description: Specifies the channel's ATI base.

      azoteq,ati-target:
        $ref: /schemas/types.yaml#/definitions/uint32
        multipleOf: 32
        minimum: 0
        maximum: 2016
        default: 512
        description: Specifies the channel's ATI target.

      azoteq,assoc-select:
        $ref: /schemas/types.yaml#/definitions/uint32-array
        minItems: 1
        maxItems: 8
        items:
          minimum: 0
          maximum: 7
        description:
          Specifies the associated channels for which the channel serves as a
          reference channel. By default, no channels are selected.

      azoteq,assoc-weight:
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 255
        default: 0
        description:
          Specifies the channel's impact weight if it acts as an associated
          channel (0 = 0% impact, 255 = 200% impact).

    patternProperties:
      "^event-prox(-alt)?$":
        type: object
        $ref: input.yaml#
        description:
          Represents a proximity event reported by the channel in response to
          a decrease in counts. Node names suffixed with '-alt' instead corre-
          spond to an increase in counts.

          By default, the long-term average tracks an increase in counts such
          that only events corresponding to a decrease in counts are reported
          (refer to the datasheet for more information).

          Specify 'azoteq,dual-direction' to freeze the long-term average when
          the counts increase or decrease such that events of either direction
          can be reported. Alternatively, specify 'azoteq,invert-enable' to in-
          vert the polarity of the states reported by the channel.

          Complementary events (e.g. event-touch and event-touch-alt) can both
          be present and specify different key or switch codes, but not differ-
          ent thresholds or hysteresis (if applicable).

        properties:
          azoteq,thresh:
            $ref: /schemas/types.yaml#/definitions/uint32
            minimum: 0
            maximum: 255
            default: 10
            description: Specifies the threshold for the event.

          linux,code: true

        additionalProperties: false

      "^event-touch(-alt)?$":
        type: object
        $ref: input.yaml#
        description: Represents a touch event reported by the channel.

        properties:
          azoteq,thresh:
            $ref: /schemas/types.yaml#/definitions/uint32
            minimum: 0
            maximum: 255
            default: 8
            description: Specifies the threshold for the event.

          azoteq,hyst:
            $ref: /schemas/types.yaml#/definitions/uint32
            minimum: 0
            maximum: 15
            default: 4
            description: Specifies the hysteresis for the event.

          linux,code: true

        additionalProperties: false

      "^event-deep(-alt)?$":
        type: object
        $ref: input.yaml#
        description: Represents a deep-touch event reported by the channel.

        properties:
          azoteq,thresh:
            $ref: /schemas/types.yaml#/definitions/uint32
            minimum: 0
            maximum: 255
            default: 26
            description: Specifies the threshold for the event.

          azoteq,hyst:
            $ref: /schemas/types.yaml#/definitions/uint32
            minimum: 0
            maximum: 15
            default: 0
            description: Specifies the hysteresis for the event.

          linux,code: true

        additionalProperties: false

    required:
      - reg

    additionalProperties: false

required:
  - compatible
  - reg
  - interrupts
  - "#address-cells"
  - "#size-cells"

additionalProperties: false

examples:
  - |
    #include <dt-bindings/input/input.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    i2c {
            #address-cells = <1>;
            #size-cells = <0>;

            touch@44 {
                    #address-cells = <1>;
                    #size-cells = <0>;

                    compatible = "azoteq,iqs269a";
                    reg = <0x44>;
                    interrupt-parent = <&gpio>;
                    interrupts = <17 IRQ_TYPE_LEVEL_LOW>;

                    azoteq,hall-enable;
                    azoteq,suspend-mode = <2>;

                    channel@0 {
                            reg = <0x0>;

                            event-prox {
                                    linux,code = <KEY_POWER>;
                            };
                    };

                    channel@1 {
                            reg = <0x1>;
                            azoteq,slider0-select;
                    };

                    channel@2 {
                            reg = <0x2>;
                            azoteq,slider0-select;
                    };

                    channel@3 {
                            reg = <0x3>;
                            azoteq,slider0-select;
                    };

                    channel@4 {
                            reg = <0x4>;
                            azoteq,slider0-select;
                    };

                    channel@5 {
                            reg = <0x5>;
                            azoteq,slider0-select;
                    };

                    channel@6 {
                            reg = <0x6>;
                            azoteq,invert-enable;
                            azoteq,static-enable;
                            azoteq,reseed-disable;
                            azoteq,rx-enable = <0>;
                            azoteq,sense-freq = <0x0>;
                            azoteq,sense-mode = <0xE>;
                            azoteq,ati-mode = <0x0>;
                            azoteq,ati-base = <200>;
                            azoteq,ati-target = <320>;
                    };

                    channel@7 {
                            reg = <0x7>;
                            azoteq,invert-enable;
                            azoteq,static-enable;
                            azoteq,reseed-disable;
                            azoteq,rx-enable = <0>, <6>;
                            azoteq,sense-freq = <0x0>;
                            azoteq,sense-mode = <0xE>;
                            azoteq,ati-mode = <0x3>;
                            azoteq,ati-base = <200>;
                            azoteq,ati-target = <320>;

                            event-touch {
                                    linux,code = <SW_LID>;
                            };
                    };
            };
    };

...