1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TS3A227E Autonomous Audio Accessory Detection and Configuration Switch
4 *
5 * Copyright (C) 2014 Google, Inc.
6 */
7
8 #include <linux/gpio.h>
9 #include <linux/i2c.h>
10 #include <linux/init.h>
11 #include <linux/input.h>
12 #include <linux/module.h>
13 #include <linux/regmap.h>
14 #include <linux/acpi.h>
15
16 #include <sound/core.h>
17 #include <sound/jack.h>
18 #include <sound/soc.h>
19
20 #include "ts3a227e.h"
21
22 struct ts3a227e {
23 struct device *dev;
24 struct regmap *regmap;
25 struct snd_soc_jack *jack;
26 bool plugged;
27 bool mic_present;
28 unsigned int buttons_held;
29 int irq;
30 };
31
32 /* Button values to be reported on the jack */
33 static const int ts3a227e_buttons[] = {
34 SND_JACK_BTN_0,
35 SND_JACK_BTN_1,
36 SND_JACK_BTN_2,
37 SND_JACK_BTN_3,
38 };
39
40 #define TS3A227E_NUM_BUTTONS 4
41 #define TS3A227E_JACK_MASK (SND_JACK_HEADPHONE | \
42 SND_JACK_MICROPHONE | \
43 SND_JACK_BTN_0 | \
44 SND_JACK_BTN_1 | \
45 SND_JACK_BTN_2 | \
46 SND_JACK_BTN_3)
47
48 /* TS3A227E registers */
49 #define TS3A227E_REG_DEVICE_ID 0x00
50 #define TS3A227E_REG_INTERRUPT 0x01
51 #define TS3A227E_REG_KP_INTERRUPT 0x02
52 #define TS3A227E_REG_INTERRUPT_DISABLE 0x03
53 #define TS3A227E_REG_SETTING_1 0x04
54 #define TS3A227E_REG_SETTING_2 0x05
55 #define TS3A227E_REG_SETTING_3 0x06
56 #define TS3A227E_REG_SWITCH_CONTROL_1 0x07
57 #define TS3A227E_REG_SWITCH_CONTROL_2 0x08
58 #define TS3A227E_REG_SWITCH_STATUS_1 0x09
59 #define TS3A227E_REG_SWITCH_STATUS_2 0x0a
60 #define TS3A227E_REG_ACCESSORY_STATUS 0x0b
61 #define TS3A227E_REG_ADC_OUTPUT 0x0c
62 #define TS3A227E_REG_KP_THRESHOLD_1 0x0d
63 #define TS3A227E_REG_KP_THRESHOLD_2 0x0e
64 #define TS3A227E_REG_KP_THRESHOLD_3 0x0f
65
66 /* TS3A227E_REG_INTERRUPT 0x01 */
67 #define INS_REM_EVENT 0x01
68 #define DETECTION_COMPLETE_EVENT 0x02
69
70 /* TS3A227E_REG_KP_INTERRUPT 0x02 */
71 #define PRESS_MASK(idx) (0x01 << (2 * (idx)))
72 #define RELEASE_MASK(idx) (0x02 << (2 * (idx)))
73
74 /* TS3A227E_REG_INTERRUPT_DISABLE 0x03 */
75 #define INS_REM_INT_DISABLE 0x01
76 #define DETECTION_COMPLETE_INT_DISABLE 0x02
77 #define ADC_COMPLETE_INT_DISABLE 0x04
78 #define INTB_DISABLE 0x08
79
80 /* TS3A227E_REG_SETTING_1 0x4 */
81 #define DEBOUNCE_INSERTION_SETTING_SFT (0)
82 #define DEBOUNCE_INSERTION_SETTING_MASK (0x7 << DEBOUNCE_PRESS_SETTING_SFT)
83
84 /* TS3A227E_REG_SETTING_2 0x05 */
85 #define KP_ENABLE 0x04
86
87 /* TS3A227E_REG_SETTING_3 0x06 */
88 #define MICBIAS_SETTING_SFT 3
89 #define MICBIAS_SETTING_MASK (0x7 << MICBIAS_SETTING_SFT)
90 #define DEBOUNCE_RELEASE_SETTING_SFT 2
91 #define DEBOUNCE_RELEASE_SETTING_MASK (0x1 << DEBOUNCE_RELEASE_SETTING_SFT)
92 #define DEBOUNCE_PRESS_SETTING_SFT 0
93 #define DEBOUNCE_PRESS_SETTING_MASK (0x3 << DEBOUNCE_PRESS_SETTING_SFT)
94
95 /* TS3A227E_REG_ACCESSORY_STATUS 0x0b */
96 #define TYPE_3_POLE 0x01
97 #define TYPE_4_POLE_OMTP 0x02
98 #define TYPE_4_POLE_STANDARD 0x04
99 #define JACK_INSERTED 0x08
100 #define EITHER_MIC_MASK (TYPE_4_POLE_OMTP | TYPE_4_POLE_STANDARD)
101
102 static const struct reg_default ts3a227e_reg_defaults[] = {
103 { TS3A227E_REG_DEVICE_ID, 0x10 },
104 { TS3A227E_REG_INTERRUPT, 0x00 },
105 { TS3A227E_REG_KP_INTERRUPT, 0x00 },
106 { TS3A227E_REG_INTERRUPT_DISABLE, 0x08 },
107 { TS3A227E_REG_SETTING_1, 0x23 },
108 { TS3A227E_REG_SETTING_2, 0x00 },
109 { TS3A227E_REG_SETTING_3, 0x0e },
110 { TS3A227E_REG_SWITCH_CONTROL_1, 0x00 },
111 { TS3A227E_REG_SWITCH_CONTROL_2, 0x00 },
112 { TS3A227E_REG_SWITCH_STATUS_1, 0x0c },
113 { TS3A227E_REG_SWITCH_STATUS_2, 0x00 },
114 { TS3A227E_REG_ACCESSORY_STATUS, 0x00 },
115 { TS3A227E_REG_ADC_OUTPUT, 0x00 },
116 { TS3A227E_REG_KP_THRESHOLD_1, 0x20 },
117 { TS3A227E_REG_KP_THRESHOLD_2, 0x40 },
118 { TS3A227E_REG_KP_THRESHOLD_3, 0x68 },
119 };
120
ts3a227e_readable_reg(struct device * dev,unsigned int reg)121 static bool ts3a227e_readable_reg(struct device *dev, unsigned int reg)
122 {
123 switch (reg) {
124 case TS3A227E_REG_DEVICE_ID ... TS3A227E_REG_KP_THRESHOLD_3:
125 return true;
126 default:
127 return false;
128 }
129 }
130
ts3a227e_writeable_reg(struct device * dev,unsigned int reg)131 static bool ts3a227e_writeable_reg(struct device *dev, unsigned int reg)
132 {
133 switch (reg) {
134 case TS3A227E_REG_INTERRUPT_DISABLE ... TS3A227E_REG_SWITCH_CONTROL_2:
135 case TS3A227E_REG_KP_THRESHOLD_1 ... TS3A227E_REG_KP_THRESHOLD_3:
136 return true;
137 default:
138 return false;
139 }
140 }
141
ts3a227e_volatile_reg(struct device * dev,unsigned int reg)142 static bool ts3a227e_volatile_reg(struct device *dev, unsigned int reg)
143 {
144 switch (reg) {
145 case TS3A227E_REG_INTERRUPT ... TS3A227E_REG_INTERRUPT_DISABLE:
146 case TS3A227E_REG_SETTING_1 ... TS3A227E_REG_SETTING_2:
147 case TS3A227E_REG_SWITCH_STATUS_1 ... TS3A227E_REG_ADC_OUTPUT:
148 return true;
149 default:
150 return false;
151 }
152 }
153
ts3a227e_jack_report(struct ts3a227e * ts3a227e)154 static void ts3a227e_jack_report(struct ts3a227e *ts3a227e)
155 {
156 unsigned int i;
157 int report = 0;
158
159 if (!ts3a227e->jack)
160 return;
161
162 if (ts3a227e->plugged)
163 report = SND_JACK_HEADPHONE;
164 if (ts3a227e->mic_present)
165 report |= SND_JACK_MICROPHONE;
166 for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
167 if (ts3a227e->buttons_held & (1 << i))
168 report |= ts3a227e_buttons[i];
169 }
170 snd_soc_jack_report(ts3a227e->jack, report, TS3A227E_JACK_MASK);
171 }
172
ts3a227e_new_jack_state(struct ts3a227e * ts3a227e,unsigned acc_reg)173 static void ts3a227e_new_jack_state(struct ts3a227e *ts3a227e, unsigned acc_reg)
174 {
175 bool plugged, mic_present;
176
177 plugged = !!(acc_reg & JACK_INSERTED);
178 mic_present = plugged && !!(acc_reg & EITHER_MIC_MASK);
179
180 ts3a227e->plugged = plugged;
181
182 if (mic_present != ts3a227e->mic_present) {
183 ts3a227e->mic_present = mic_present;
184 ts3a227e->buttons_held = 0;
185 if (mic_present) {
186 /* Enable key press detection. */
187 regmap_update_bits(ts3a227e->regmap,
188 TS3A227E_REG_SETTING_2,
189 KP_ENABLE, KP_ENABLE);
190 }
191 }
192 }
193
ts3a227e_interrupt(int irq,void * data)194 static irqreturn_t ts3a227e_interrupt(int irq, void *data)
195 {
196 struct ts3a227e *ts3a227e = (struct ts3a227e *)data;
197 struct regmap *regmap = ts3a227e->regmap;
198 unsigned int int_reg, kp_int_reg, acc_reg, i;
199 struct device *dev = ts3a227e->dev;
200 int ret;
201
202 /* Check for plug/unplug. */
203 ret = regmap_read(regmap, TS3A227E_REG_INTERRUPT, &int_reg);
204 if (ret) {
205 dev_err(dev, "failed to clear interrupt ret=%d\n", ret);
206 return IRQ_NONE;
207 }
208
209 if (int_reg & (DETECTION_COMPLETE_EVENT | INS_REM_EVENT)) {
210 regmap_read(regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
211 ts3a227e_new_jack_state(ts3a227e, acc_reg);
212 }
213
214 /* Report any key events. */
215 ret = regmap_read(regmap, TS3A227E_REG_KP_INTERRUPT, &kp_int_reg);
216 if (ret) {
217 dev_err(dev, "failed to clear key interrupt ret=%d\n", ret);
218 return IRQ_NONE;
219 }
220
221 for (i = 0; i < TS3A227E_NUM_BUTTONS; i++) {
222 if (kp_int_reg & PRESS_MASK(i))
223 ts3a227e->buttons_held |= (1 << i);
224 if (kp_int_reg & RELEASE_MASK(i))
225 ts3a227e->buttons_held &= ~(1 << i);
226 }
227
228 ts3a227e_jack_report(ts3a227e);
229
230 return IRQ_HANDLED;
231 }
232
233 /**
234 * ts3a227e_enable_jack_detect - Specify a jack for event reporting
235 *
236 * @component: component to register the jack with
237 * @jack: jack to use to report headset and button events on
238 *
239 * After this function has been called the headset insert/remove and button
240 * events 0-3 will be routed to the given jack. Jack can be null to stop
241 * reporting.
242 */
ts3a227e_enable_jack_detect(struct snd_soc_component * component,struct snd_soc_jack * jack)243 int ts3a227e_enable_jack_detect(struct snd_soc_component *component,
244 struct snd_soc_jack *jack)
245 {
246 struct ts3a227e *ts3a227e = snd_soc_component_get_drvdata(component);
247
248 snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
249 snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
250 snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
251 snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
252
253 ts3a227e->jack = jack;
254 ts3a227e_jack_report(ts3a227e);
255
256 return 0;
257 }
258 EXPORT_SYMBOL_GPL(ts3a227e_enable_jack_detect);
259
ts3a227e_set_jack(struct snd_soc_component * component,struct snd_soc_jack * jack,void * data)260 static int ts3a227e_set_jack(struct snd_soc_component *component,
261 struct snd_soc_jack *jack, void *data)
262 {
263 if (jack == NULL)
264 return -EINVAL;
265
266 return ts3a227e_enable_jack_detect(component, jack);
267 }
268
ts3a227e_get_jack_type(struct snd_soc_component * component)269 static int ts3a227e_get_jack_type(struct snd_soc_component *component)
270 {
271 return SND_JACK_HEADSET;
272 }
273
274 static const struct snd_soc_component_driver ts3a227e_soc_driver = {
275 .name = "ti,ts3a227e",
276 .set_jack = ts3a227e_set_jack,
277 .get_jack_type = ts3a227e_get_jack_type,
278 };
279
280 static const struct regmap_config ts3a227e_regmap_config = {
281 .val_bits = 8,
282 .reg_bits = 8,
283
284 .max_register = TS3A227E_REG_KP_THRESHOLD_3,
285 .readable_reg = ts3a227e_readable_reg,
286 .writeable_reg = ts3a227e_writeable_reg,
287 .volatile_reg = ts3a227e_volatile_reg,
288
289 .cache_type = REGCACHE_RBTREE,
290 .reg_defaults = ts3a227e_reg_defaults,
291 .num_reg_defaults = ARRAY_SIZE(ts3a227e_reg_defaults),
292 };
293
ts3a227e_parse_device_property(struct ts3a227e * ts3a227e,struct device * dev)294 static int ts3a227e_parse_device_property(struct ts3a227e *ts3a227e,
295 struct device *dev)
296 {
297 u32 value;
298 u32 value_ms;
299 u32 setting3_value = 0;
300 u32 setting3_mask = 0;
301 int err;
302
303 err = device_property_read_u32(dev, "ti,micbias", &value);
304 if (!err) {
305 setting3_mask = MICBIAS_SETTING_MASK;
306 setting3_value = (value << MICBIAS_SETTING_SFT) &
307 MICBIAS_SETTING_MASK;
308 }
309
310 err = device_property_read_u32(dev, "ti,debounce-release-ms",
311 &value_ms);
312 if (!err) {
313 value = (value_ms > 10);
314 setting3_mask |= DEBOUNCE_RELEASE_SETTING_MASK;
315 setting3_value |= (value << DEBOUNCE_RELEASE_SETTING_SFT) &
316 DEBOUNCE_RELEASE_SETTING_MASK;
317 }
318
319 err = device_property_read_u32(dev, "ti,debounce-press-ms", &value_ms);
320 if (!err) {
321 value = (value_ms + 20) / 40;
322 if (value > 3)
323 value = 3;
324 setting3_mask |= DEBOUNCE_PRESS_SETTING_MASK;
325 setting3_value |= (value << DEBOUNCE_PRESS_SETTING_SFT) &
326 DEBOUNCE_PRESS_SETTING_MASK;
327 }
328
329 if (setting3_mask)
330 regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_3,
331 setting3_mask, setting3_value);
332
333 err = device_property_read_u32(dev, "ti,debounce-insertion-ms",
334 &value_ms);
335 if (!err) {
336 if (value_ms < 165)
337 value = (value_ms + 15) / 30;
338 else if (value_ms < 1500)
339 value = 6;
340 else
341 value = 7;
342 regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_SETTING_1,
343 DEBOUNCE_INSERTION_SETTING_MASK,
344 (value << DEBOUNCE_INSERTION_SETTING_SFT) &
345 DEBOUNCE_INSERTION_SETTING_MASK);
346 }
347
348 return 0;
349 }
350
ts3a227e_i2c_probe(struct i2c_client * i2c)351 static int ts3a227e_i2c_probe(struct i2c_client *i2c)
352 {
353 struct ts3a227e *ts3a227e;
354 struct device *dev = &i2c->dev;
355 int ret;
356 unsigned int acc_reg;
357
358 ts3a227e = devm_kzalloc(&i2c->dev, sizeof(*ts3a227e), GFP_KERNEL);
359 if (ts3a227e == NULL)
360 return -ENOMEM;
361
362 i2c_set_clientdata(i2c, ts3a227e);
363 ts3a227e->dev = dev;
364 ts3a227e->irq = i2c->irq;
365
366 ts3a227e->regmap = devm_regmap_init_i2c(i2c, &ts3a227e_regmap_config);
367 if (IS_ERR(ts3a227e->regmap))
368 return PTR_ERR(ts3a227e->regmap);
369
370 ret = ts3a227e_parse_device_property(ts3a227e, dev);
371 if (ret) {
372 dev_err(dev, "Failed to parse device property: %d\n", ret);
373 return ret;
374 }
375
376 ret = devm_request_threaded_irq(dev, i2c->irq, NULL, ts3a227e_interrupt,
377 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
378 "TS3A227E", ts3a227e);
379 if (ret) {
380 dev_err(dev, "Cannot request irq %d (%d)\n", i2c->irq, ret);
381 return ret;
382 }
383
384 ret = devm_snd_soc_register_component(&i2c->dev, &ts3a227e_soc_driver,
385 NULL, 0);
386 if (ret)
387 return ret;
388
389 /* Enable interrupts except for ADC complete. */
390 regmap_update_bits(ts3a227e->regmap, TS3A227E_REG_INTERRUPT_DISABLE,
391 INTB_DISABLE | ADC_COMPLETE_INT_DISABLE,
392 ADC_COMPLETE_INT_DISABLE);
393
394 /* Read jack status because chip might not trigger interrupt at boot. */
395 regmap_read(ts3a227e->regmap, TS3A227E_REG_ACCESSORY_STATUS, &acc_reg);
396 ts3a227e_new_jack_state(ts3a227e, acc_reg);
397 ts3a227e_jack_report(ts3a227e);
398
399 return 0;
400 }
401
402 #ifdef CONFIG_PM_SLEEP
ts3a227e_suspend(struct device * dev)403 static int ts3a227e_suspend(struct device *dev)
404 {
405 struct ts3a227e *ts3a227e = dev_get_drvdata(dev);
406
407 dev_dbg(ts3a227e->dev, "suspend disable irq\n");
408 disable_irq(ts3a227e->irq);
409
410 return 0;
411 }
412
ts3a227e_resume(struct device * dev)413 static int ts3a227e_resume(struct device *dev)
414 {
415 struct ts3a227e *ts3a227e = dev_get_drvdata(dev);
416
417 dev_dbg(ts3a227e->dev, "resume enable irq\n");
418 enable_irq(ts3a227e->irq);
419
420 return 0;
421 }
422 #endif
423
424 static const struct dev_pm_ops ts3a227e_pm = {
425 SET_SYSTEM_SLEEP_PM_OPS(ts3a227e_suspend, ts3a227e_resume)
426 };
427
428 static const struct i2c_device_id ts3a227e_i2c_ids[] = {
429 { "ts3a227e" },
430 { }
431 };
432 MODULE_DEVICE_TABLE(i2c, ts3a227e_i2c_ids);
433
434 #ifdef CONFIG_OF
435 static const struct of_device_id ts3a227e_of_match[] = {
436 { .compatible = "ti,ts3a227e", },
437 { }
438 };
439 MODULE_DEVICE_TABLE(of, ts3a227e_of_match);
440 #endif
441
442 #ifdef CONFIG_ACPI
443 static struct acpi_device_id ts3a227e_acpi_match[] = {
444 { "104C227E", 0 },
445 {},
446 };
447 MODULE_DEVICE_TABLE(acpi, ts3a227e_acpi_match);
448 #endif
449
450 static struct i2c_driver ts3a227e_driver = {
451 .driver = {
452 .name = "ts3a227e",
453 .pm = &ts3a227e_pm,
454 .of_match_table = of_match_ptr(ts3a227e_of_match),
455 .acpi_match_table = ACPI_PTR(ts3a227e_acpi_match),
456 },
457 .probe = ts3a227e_i2c_probe,
458 .id_table = ts3a227e_i2c_ids,
459 };
460 module_i2c_driver(ts3a227e_driver);
461
462 MODULE_DESCRIPTION("ASoC ts3a227e driver");
463 MODULE_AUTHOR("Dylan Reid <dgreid@chromium.org>");
464 MODULE_LICENSE("GPL v2");
465