ASoC: arizona-jack: Use snd_soc_jack to report jack events

Use the snd_soc_jack code to report jack events, instead of using extcon
for reporting the cable-type + an input_dev for reporting the button
presses.

The snd_soc_jack code will report the cable-type through both input_dev
events and through ALSA controls and the button-presses through input_dev
events.

Note that this means that when the codec drivers are moved over to use
the new arizona-jack.c library code instead of having a separate MFD
extcon cell with the extcon-arizona.c driver, we will no longer report
extcon events to userspace for cable-type changes. This should not be
a problem since "standard" Linux distro userspace does not (and has
never) used the extcon class interface for this. Android does have
support for the extcon class interface, but that was introduced in
the same release as support for input_dev cable-type events, so this
should not be a problem for Android either.

Note this also reduces ARIZONA_MAX_MICD_RANGE from 8 to 6, this is
ok to do since this info is always provided through pdata (or defaults)
and cannot be overridden from devicetree. All in-kernel users of the
pdata (and the fallback defaults) define 6 or less buttons/ranges.

Reviewed-by: Andy Shevchenko <[e-mail]>
Acked-by: Charles Keepax <[e-mail]>
Tested-by: Charles Keepax <[e-mail]>
Signed-off-by: Hans de Goede <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/arizona-jack.c

···
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>
-#include <linux/extcon-provider.h>
 
+#include <sound/jack.h>
 #include <sound/soc.h>
 
 #include <linux/mfd/arizona/core.h>
···
 #include "arizona.h"
 
 #define ARIZONA_MAX_MICD_RANGE 8
+
+/*
+ * The hardware supports 8 ranges / buttons, but the snd-jack interface
+ * only supports 6 buttons (button 0-5).
+ */
+#define ARIZONA_MAX_MICD_BUTTONS 6
 
 #define ARIZONA_MICD_CLAMP_MODE_JDL      0x4
 #define ARIZONA_MICD_CLAMP_MODE_JDH      0x5
···
 	105, 111, 116, 122, 127, 139, 150, 161, 173, 186, 196, 209, 220, 245,
 	270, 295, 321, 348, 375, 402, 430, 489, 550, 614, 681, 752, 903, 1071,
 	1257, 30000,
-};
-
-static const unsigned int arizona_cable[] = {
-	EXTCON_MECHANICAL,
-	EXTCON_JACK_MICROPHONE,
-	EXTCON_JACK_HEADPHONE,
-	EXTCON_JACK_LINE_OUT,
-	EXTCON_NONE,
 };
 
 static void arizona_start_hpdet_acc_id(struct arizona_priv *info);
···
 	struct arizona_priv *info = data;
 	struct arizona *arizona = info->arizona;
 	int id_gpio = arizona->pdata.hpdet_id_gpio;
-	unsigned int report = EXTCON_JACK_HEADPHONE;
-	int ret, reading, state;
+	int ret, reading, state, report;
 	bool mic = false;
 
 	mutex_lock(&info->lock);
···
 	}
 
 	/* If the cable was removed while measuring ignore the result */
-	state = extcon_get_state(info->edev, EXTCON_MECHANICAL);
-	if (state < 0) {
-		dev_err(arizona->dev, "Failed to check cable state: %d\n", state);
-		goto out;
-	} else if (!state) {
+	state = info->jack->status & SND_JACK_MECHANICAL;
+	if (!state) {
 		dev_dbg(arizona->dev, "Ignoring HPDET for removed cable\n");
 		goto done;
 	}
···
 
 	/* Report high impedence cables as line outputs */
 	if (reading >= 5000)
-		report = EXTCON_JACK_LINE_OUT;
+		report = SND_JACK_LINEOUT;
 	else
-		report = EXTCON_JACK_HEADPHONE;
+		report = SND_JACK_HEADPHONE;
 
-	ret = extcon_set_state_sync(info->edev, report, true);
-	if (ret != 0)
-		dev_err(arizona->dev, "Failed to report HP/line: %d\n",
-			ret);
+	snd_soc_jack_report(info->jack, report, SND_JACK_LINEOUT | SND_JACK_HEADPHONE);
 
 done:
 	/* Reset back to starting range */
···
 	pm_runtime_put_autosuspend(arizona->dev);
 
 	/* Just report headphone */
-	ret = extcon_set_state_sync(info->edev, EXTCON_JACK_HEADPHONE, true);
-	if (ret != 0)
-		dev_err(arizona->dev, "Failed to report headphone: %d\n", ret);
+	snd_soc_jack_report(info->jack, SND_JACK_HEADPHONE,
+			    SND_JACK_LINEOUT | SND_JACK_HEADPHONE);
 
 	if (info->mic)
 		arizona_start_mic(info);
···
 
 err:
 	/* Just report headphone */
-	ret = extcon_set_state_sync(info->edev, EXTCON_JACK_HEADPHONE, true);
-	if (ret != 0)
-		dev_err(arizona->dev, "Failed to report headphone: %d\n", ret);
+	snd_soc_jack_report(info->jack, SND_JACK_HEADPHONE,
+			    SND_JACK_LINEOUT | SND_JACK_HEADPHONE);
 
 	info->hpdet_active = false;
 }
···
 
 		arizona_identify_headphone(info);
 
-		ret = extcon_set_state_sync(info->edev,
-					      EXTCON_JACK_MICROPHONE, true);
-		if (ret != 0)
-			dev_err(arizona->dev, "Headset report failed: %d\n",
-				ret);
+		snd_soc_jack_report(info->jack, SND_JACK_MICROPHONE, SND_JACK_MICROPHONE);
 
 		/* Don't need to regulate for button detection */
 		ret = regulator_allow_bypass(info->micvdd, true);
···
 {
 	struct arizona_priv *info = priv;
 	struct arizona *arizona = info->arizona;
-	int val, key, lvl, i;
+	int val, key, lvl;
 
 	val = arizona_micd_read(info);
 	if (val < 0)
···
 			lvl = val & ARIZONA_MICD_LVL_MASK;
 			lvl >>= ARIZONA_MICD_LVL_SHIFT;
 
-			for (i = 0; i < info->num_micd_ranges; i++)
-				input_report_key(info->input,
-						 info->micd_ranges[i].key, 0);
-
 			if (lvl && ffs(lvl) - 1 < info->num_micd_ranges) {
-				key = info->micd_ranges[ffs(lvl) - 1].key;
-				input_report_key(info->input, key, 1);
-				input_sync(info->input);
+				key = ffs(lvl) - 1;
+				snd_soc_jack_report(info->jack,
+						    SND_JACK_BTN_0 >> key,
+						    info->micd_button_mask);
 			} else {
 				dev_err(arizona->dev, "Button out of range\n");
 			}
···
 		}
 	} else {
 		dev_dbg(arizona->dev, "Mic button released\n");
-		for (i = 0; i < info->num_micd_ranges; i++)
-			input_report_key(info->input,
-					 info->micd_ranges[i].key, 0);
-		input_sync(info->input);
+		snd_soc_jack_report(info->jack, 0, info->micd_button_mask);
 		arizona_extcon_pulse_micbias(info);
 	}
 
···
 						struct arizona_priv,
 						micd_detect_work.work);
 	struct arizona *arizona = info->arizona;
-	int ret;
 
 	cancel_delayed_work_sync(&info->micd_timeout_work);
 
 	mutex_lock(&info->lock);
 
 	/* If the cable was removed while measuring ignore the result */
-	ret = extcon_get_state(info->edev, EXTCON_MECHANICAL);
-	if (ret < 0) {
-		dev_err(arizona->dev, "Failed to check cable state: %d\n",
-				ret);
-		mutex_unlock(&info->lock);
-		return;
-	} else if (!ret) {
+	if (!(info->jack->status & SND_JACK_MECHANICAL)) {
 		dev_dbg(arizona->dev, "Ignoring MICDET for removed cable\n");
 		mutex_unlock(&info->lock);
 		return;
···
 
 	if (info->last_jackdet == present) {
 		dev_dbg(arizona->dev, "Detected jack\n");
-		ret = extcon_set_state_sync(info->edev,
-					      EXTCON_MECHANICAL, true);
-
-		if (ret != 0)
-			dev_err(arizona->dev, "Mechanical report failed: %d\n",
-				ret);
+		snd_soc_jack_report(info->jack, SND_JACK_MECHANICAL, SND_JACK_MECHANICAL);
 
 		info->detecting = true;
 		info->mic = false;
···
 		info->hpdet_done = false;
 		info->hpdet_retried = false;
 
-		for (i = 0; i < info->num_micd_ranges; i++)
-			input_report_key(info->input,
-					 info->micd_ranges[i].key, 0);
-		input_sync(info->input);
-
-		for (i = 0; i < ARRAY_SIZE(arizona_cable) - 1; i++) {
-			ret = extcon_set_state_sync(info->edev,
-					arizona_cable[i], false);
-			if (ret != 0)
-				dev_err(arizona->dev,
-					"Removal report failed: %d\n", ret);
-		}
+		snd_soc_jack_report(info->jack, 0, ARIZONA_JACK_MASK | info->micd_button_mask);
 
 		/*
 		 * If the jack was removed during a headphone detection we
···
 		break;
 	}
 
-	info->edev = devm_extcon_dev_allocate(dev, arizona_cable);
-	if (IS_ERR(info->edev)) {
-		dev_err(arizona->dev, "failed to allocate extcon device\n");
-		return -ENOMEM;
-	}
-
-	ret = devm_extcon_dev_register(dev, info->edev);
-	if (ret < 0) {
-		dev_err(arizona->dev, "extcon_dev_register() failed: %d\n",
-			ret);
-		return ret;
-	}
-
-	info->input = devm_input_allocate_device(dev);
-	if (!info->input) {
-		dev_err(arizona->dev, "Can't allocate input dev\n");
-		ret = -ENOMEM;
-		return ret;
-	}
-
-	info->input->name = "Headset";
-	info->input->phys = "arizona/extcon";
-
 	if (!pdata->micd_timeout)
 		pdata->micd_timeout = DEFAULT_MICD_TIMEOUT;
 
···
 		info->num_micd_ranges = ARRAY_SIZE(micd_default_ranges);
 	}
 
-	if (arizona->pdata.num_micd_ranges > ARIZONA_MAX_MICD_RANGE) {
-		dev_err(arizona->dev, "Too many MICD ranges: %d\n",
-			arizona->pdata.num_micd_ranges);
+	if (arizona->pdata.num_micd_ranges > ARIZONA_MAX_MICD_BUTTONS) {
+		dev_err(arizona->dev, "Too many MICD ranges: %d > %d\n",
+			arizona->pdata.num_micd_ranges, ARIZONA_MAX_MICD_BUTTONS);
 		return -EINVAL;
 	}
 
···
 			arizona_micd_levels[j], i);
 
 		arizona_micd_set_level(arizona, i, j);
-		input_set_capability(info->input, EV_KEY,
-				     info->micd_ranges[i].key);
+
+		/* SND_JACK_BTN_# masks start with the most significant bit */
+		info->micd_button_mask |= SND_JACK_BTN_0 >> i;
+		snd_jack_set_key(jack->jack, SND_JACK_BTN_0 >> i,
+				 info->micd_ranges[i].key);
 
 		/* Enable reporting of that range */
 		regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_2,
···
 	}
 
 	arizona_extcon_set_mode(info, 0);
+
+	info->jack = jack;
 
 	pm_runtime_get_sync(arizona->dev);
 
···
 	if (ret != 0)
 		dev_warn(arizona->dev, "Failed to set MICVDD to bypass: %d\n", ret);
 
-	ret = input_register_device(info->input);
-	if (ret) {
-		dev_err(arizona->dev, "Can't register input device: %d\n", ret);
-		goto err_hpdet;
-	}
-
 	pm_runtime_put(arizona->dev);
 
 	return 0;
 
-err_hpdet:
-	arizona_free_irq(arizona, ARIZONA_IRQ_HPDET, info);
 err_micdet:
 	arizona_free_irq(arizona, ARIZONA_IRQ_MICDET, info);
 err_fall_wake:
···
 	arizona_free_irq(arizona, jack_irq_rise, info);
 err_pm:
 	pm_runtime_put(arizona->dev);
+	info->jack = NULL;
 	return ret;
 }
 
···
 	int jack_irq_rise, jack_irq_fall;
 	bool change;
 	int ret;
+
+	if (!info->jack)
+		return 0;
 
 	if (info->micd_clamp) {
 		jack_irq_rise = ARIZONA_IRQ_MICD_CLAMP_RISE;
···
 	regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_ANALOGUE,
 			   ARIZONA_JD1_ENA, 0);
 	arizona_clk32k_disable(arizona);
+	info->jack = NULL;
 
 	return 0;
 }

sound/soc/codecs/arizona.h

···
 	struct delayed_work hpdet_work;
 	struct delayed_work micd_detect_work;
 	struct delayed_work micd_timeout_work;
+	struct snd_soc_jack *jack;
 	struct regulator *micvdd;
-	struct input_dev *input;
-	struct extcon_dev *edev;
 	struct gpio_desc *micd_pol_gpio;
 
 	u16 last_jackdet;
···
 	const struct arizona_micd_config *micd_modes;
 	int micd_num_modes;
 
+	int micd_button_mask;
 	const struct arizona_micd_range *micd_ranges;
 	int num_micd_ranges;
 
···
 
 #define ARIZONA_RATE_ENUM_SIZE 4
 #define ARIZONA_SAMPLE_RATE_ENUM_SIZE 14
+
+/* SND_JACK_* mask for supported cable/switch types */
+#define ARIZONA_JACK_MASK  (SND_JACK_HEADSET | SND_JACK_LINEOUT | SND_JACK_MECHANICAL)
 
 extern const char * const arizona_rate_text[ARIZONA_RATE_ENUM_SIZE];
 extern const unsigned int arizona_rate_val[ARIZONA_RATE_ENUM_SIZE];