path: root/sound/soc/codecs/cs35l45.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
//
// cs35l45.c - CS35L45 ALSA SoC audio driver
//
// Copyright 2019-2022 Cirrus Logic, Inc.
//
// Author: James Schulman <james.schulman@cirrus.com>

#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/firmware.h>
#include <linux/regulator/consumer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#include "cs35l45.h"

static bool cs35l45_check_cspl_mbox_sts(const enum cs35l45_cspl_mboxcmd cmd,
					enum cs35l45_cspl_mboxstate sts)
{
	switch (cmd) {
	case CSPL_MBOX_CMD_NONE:
	case CSPL_MBOX_CMD_UNKNOWN_CMD:
		return true;
	case CSPL_MBOX_CMD_PAUSE:
	case CSPL_MBOX_CMD_OUT_OF_HIBERNATE:
		return (sts == CSPL_MBOX_STS_PAUSED);
	case CSPL_MBOX_CMD_RESUME:
		return (sts == CSPL_MBOX_STS_RUNNING);
	case CSPL_MBOX_CMD_REINIT:
		return (sts == CSPL_MBOX_STS_RUNNING);
	case CSPL_MBOX_CMD_STOP_PRE_REINIT:
		return (sts == CSPL_MBOX_STS_RDY_FOR_REINIT);
	default:
		return false;
	}
}

static int cs35l45_set_cspl_mbox_cmd(struct cs35l45_private *cs35l45,
				      struct regmap *regmap,
				      const enum cs35l45_cspl_mboxcmd cmd)
{
	unsigned int sts = 0, i;
	int ret;

	if (!cs35l45->dsp.cs_dsp.running) {
		dev_err(cs35l45->dev, "DSP not running\n");
		return -EPERM;
	}

	// Set mailbox cmd
	ret = regmap_write(regmap, CS35L45_DSP_VIRT1_MBOX_1, cmd);
	if (ret < 0) {
		if (cmd != CSPL_MBOX_CMD_OUT_OF_HIBERNATE)
			dev_err(cs35l45->dev, "Failed to write MBOX: %d\n", ret);
		return ret;
	}

	// Read mailbox status and verify it is appropriate for the given cmd
	for (i = 0; i < 5; i++) {
		usleep_range(1000, 1100);

		ret = regmap_read(regmap, CS35L45_DSP_MBOX_2, &sts);
		if (ret < 0) {
			dev_err(cs35l45->dev, "Failed to read MBOX STS: %d\n", ret);
			continue;
		}

		if (!cs35l45_check_cspl_mbox_sts(cmd, sts))
			dev_dbg(cs35l45->dev, "[%u] cmd %u returned invalid sts %u", i, cmd, sts);
		else
			return 0;
	}

	if (cmd != CSPL_MBOX_CMD_OUT_OF_HIBERNATE)
		dev_err(cs35l45->dev, "Failed to set mailbox cmd %u (status %u)\n", cmd, sts);

	return -ENOMSG;
}

static int cs35l45_global_en_ev(struct snd_soc_dapm_widget *w,
				struct snd_kcontrol *kcontrol, int event)
{
	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
	struct cs35l45_private *cs35l45 = snd_soc_component_get_drvdata(component);

	dev_dbg(cs35l45->dev, "%s event : %x\n", __func__, event);

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		regmap_write(cs35l45->regmap, CS35L45_GLOBAL_ENABLES,
			     CS35L45_GLOBAL_EN_MASK);

		usleep_range(CS35L45_POST_GLOBAL_EN_US, CS35L45_POST_GLOBAL_EN_US + 100);
		break;
	case SND_SOC_DAPM_PRE_PMD:
		usleep_range(CS35L45_PRE_GLOBAL_DIS_US, CS35L45_PRE_GLOBAL_DIS_US + 100);

		regmap_write(cs35l45->regmap, CS35L45_GLOBAL_ENABLES, 0);
		break;
	default:
		break;
	}

	return 0;
}

static int cs35l45_dsp_preload_ev(struct snd_soc_dapm_widget *w,
				  struct snd_kcontrol *kcontrol, int event)
{
	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
	struct cs35l45_private *cs35l45 = snd_soc_component_get_drvdata(component);
	int ret;

	switch (event)