path: root/sound/soc/codecs/da7219-aad.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * da7219-aad.c - Dialog DA7219 ALSA SoC AAD Driver
 *
 * Copyright (c) 2015 Dialog Semiconductor Ltd.
 *
 * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/property.h>
#include <linux/pm_wakeirq.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <sound/soc.h>
#include <sound/jack.h>
#include <sound/da7219.h>

#include "da7219.h"
#include "da7219-aad.h"


/*
 * Detection control
 */

void da7219_aad_jack_det(struct snd_soc_component *component, struct snd_soc_jack *jack)
{
	struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);

	da7219->aad->jack = jack;
	da7219->aad->jack_inserted = false;

	/* Send an initial empty report */
	snd_soc_jack_report(jack, 0, DA7219_AAD_REPORT_ALL_MASK);

	/* Enable/Disable jack detection */
	snd_soc_component_update_bits(component, DA7219_ACCDET_CONFIG_1,
			    DA7219_ACCDET_EN_MASK,
			    (jack ? DA7219_ACCDET_EN_MASK : 0));
}

/*
 * Button/HPTest work
 */

static void da7219_aad_btn_det_work(struct work_struct *work)
{
	struct da7219_aad_priv *da7219_aad =
		container_of(work, struct da7219_aad_priv, btn_det_work);
	struct snd_soc_component *component = da7219_aad->component;
	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
	struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
	u8 statusa, micbias_ctrl;
	bool micbias_up = false;
	int retries = 0;

	/* Drive headphones/lineout */
	snd_soc_component_update_bits(component, DA7219_HP_L_CTRL,
			    DA7219_HP_L_AMP_OE_MASK,
			    DA7219_HP_L_AMP_OE_MASK);
	snd_soc_component_update_bits(component, DA7219_HP_R_CTRL,
			    DA7219_HP_R_AMP_OE_MASK,
			    DA7219_HP_R_AMP_OE_MASK);

	/* Make sure mic bias is up */
	snd_soc_dapm_force_enable_pin(dapm, "Mic Bias");
	snd_soc_dapm_sync(dapm);

	do {
		statusa = snd_soc_component_read(component, DA7219_ACCDET_STATUS_A);
		if (statusa & DA7219_MICBIAS_UP_STS_MASK)
			micbias_up = true;
		else if (retries++ < DA7219_AAD_MICBIAS_CHK_RETRIES)
			msleep(DA7219_AAD_MICBIAS_CHK_DELAY);
	} while ((!micbias_up) && (retries < DA7219_AAD_MICBIAS_CHK_RETRIES));

	if (retries >= DA7219_AAD_MICBIAS_CHK_RETRIES)
		dev_warn(component->dev, "Mic bias status check timed out");

	da7219->micbias_on_event = true;

	/*
	 * Mic bias pulse required to enable mic, must be done before enabling
	 * button detection to prevent erroneous button readings.
	 */
	if (da7219_aad->micbias_pulse_lvl && da7219_aad->micbias_pulse_time) {
		/* Pulse higher level voltage */
		micbias_ctrl = snd_soc_component_read(component, DA7219_MICBIAS_CTRL);
		snd_soc_component_update_bits(component, DA7219_MICBIAS_CTRL,
				    DA7219_MICBIAS1_LEVEL_MASK,
				    da7219_aad->micbias_pulse_lvl);
		msleep(da7219_aad->micbias_pulse_time);
		snd_soc_component_write(component, DA7219_MICBIAS_CTRL, micbias_ctrl);

	}

	snd_soc_component_update_bits(component, DA7219_ACCDET_CONFIG_1,
			    DA7219_BUTTON_CONFIG_MASK,
			    da7219_aad->btn_cfg);
}

static void da7219_aad_hptest_work(struct work_struct *work)
{
	struct da7219_aad_priv *da7219_aad =
		container_of(work, struct da7219_aad_priv, hptest_work);
	struct snd_soc_component *component = da7219_aad->component;
	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
	struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);

	__le16 tonegen_freq_hptest;
	u8 pll_srm_sts, pll_ctrl, gain_ramp_ctrl, accdet_cfg8;
	int report = 0, ret;

	/* Lock DAPM, Kcontrols affected by this test and the PLL */
	snd_soc_dapm_mutex_lock(dapm);
	mutex_lock(&da7219->ctrl_lock);
	mutex_lock(&da7219->pll_lock);

	/* Ensure MCLK is available for HP test procedure */
	if (da7219->mclk) {
		ret = clk_prepare_enable(da7219->mclk);
		if (ret) {
			dev_err(component->dev, "Failed to enable mclk - %d\n", ret);
			mutex_unlock(&da7219->pll_lock);
			mutex_unlock(&da7219->ctrl_lock);
			snd_soc_dapm_mutex_unlock(dapm);
			return;
		}
	}

	/*
	 * If MCLK not present, then we're using the internal oscillator and
	 * require different frequency settings to achieve the same result.
	 *
	 * If MCLK is present, but PLL is not enabled then we enable it here to
	 * ensure a consistent detection procedure.
	 */
	pll_srm_sts = snd_soc_component_read(component, DA7219_PLL_SRM_STS);
	if (pll_srm_sts & DA7219_PLL_SRM_STS_MCLK) {
		tonegen_freq_hptest = cpu_to_le16(DA7219_AAD_HPTEST_RAMP_FREQ);

		pll_ctrl = snd_soc_component_read(component, DA7219_PLL_CTRL);
		if ((pll_ctrl & DA7219_PLL_MODE_MASK) == DA7219_PLL_MODE_BYPASS)
			da7219_set_pll(component, DA7219_SYSCLK_PLL,
				       DA7219_PLL_FREQ_OUT_98304);
	} else {
		tonegen_freq_hptest = cpu_to_le16(DA7219_AAD_HPTEST_RAMP_FREQ_INT_OSC);
	}

	/* Ensure gain ramping at fastest rate */
	gain_ramp_ctrl = snd_soc_component_read(component, DA7219_GAIN_RAMP_CTRL);
	snd_soc_component_write(component, DA7219_GAIN_RAMP_CTRL, DA7219_GAIN_RAMP_RATE_X8);

	/* Bypass cache so it saves current settings */
	regcache_cache_bypass(da7219->regmap, true);

	/* Make sure Tone Generator is disabled */
	snd_soc_component_write(component, DA7219_TONE_GEN_CFG1, 0);

	/* Enable HPTest block, 1KOhms check */
	snd_soc_component_update_bits(component, DA7219_ACCDET_CONFIG_8,
			    DA7219_HPTEST_EN_MASK | DA7219_HPTEST_RES_SEL_MASK,
			    DA7219_HPTEST_EN_MASK |
			    DA7219_HPTEST_RES_SEL_1KOHMS);

	/* Set gains to 0db */