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Linux/sound/soc/codecs/ts3a227e.c

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

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