1 files changed, 443 insertions, 0 deletions
diff --git a/sound/soc/codecs/cx20442.c b/sound/soc/codecs/cx20442.c
new file mode 100644
index 000000000..161be8b7d
--- /dev/null
+++ b/sound/soc/codecs/cx20442.c
@@ -0,0 +1,443 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * cx20442.c  --  CX20442 ALSA Soc Audio driver
+ *
+ * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
+ *
+ * Initially based on sound/soc/codecs/wm8400.c
+ * Copyright 2008, 2009 Wolfson Microelectronics PLC.
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ */
+
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "cx20442.h"
+
+
+struct cx20442_priv {
+	struct tty_struct *tty;
+	struct regulator *por;
+	u8 reg_cache;
+};
+
+#define CX20442_PM		0x0
+
+#define CX20442_TELIN		0
+#define CX20442_TELOUT		1
+#define CX20442_MIC		2
+#define CX20442_SPKOUT		3
+#define CX20442_AGC		4
+
+static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
+	SND_SOC_DAPM_OUTPUT("TELOUT"),
+	SND_SOC_DAPM_OUTPUT("SPKOUT"),
+	SND_SOC_DAPM_OUTPUT("AGCOUT"),
+
+	SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
+
+	SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
+	SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
+	SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
+
+	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
+
+	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
+
+	SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
+	SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
+
+	SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
+
+	SND_SOC_DAPM_INPUT("TELIN"),
+	SND_SOC_DAPM_INPUT("MIC"),
+	SND_SOC_DAPM_INPUT("AGCIN"),
+};
+
+static const struct snd_soc_dapm_route cx20442_audio_map[] = {
+	{"TELOUT", NULL, "TELOUT Amp"},
+
+	{"SPKOUT", NULL, "SPKOUT Mixer"},
+	{"SPKOUT Mixer", NULL, "SPKOUT Amp"},
+
+	{"TELOUT Amp", NULL, "DAC"},
+	{"SPKOUT Amp", NULL, "DAC"},
+
+	{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
+	{"SPKOUT AGC", NULL, "AGCIN"},
+
+	{"AGCOUT", NULL, "MIC AGC"},
+	{"MIC AGC", NULL, "MIC"},
+
+	{"MIC Bias", NULL, "MIC"},
+	{"Input Mixer", NULL, "MIC Bias"},
+
+	{"TELIN Bias", NULL, "TELIN"},
+	{"Input Mixer", NULL, "TELIN Bias"},
+
+	{"ADC", NULL, "Input Mixer"},
+};
+
+static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component,
+					   unsigned int reg)
+{
+	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
+
+	if (reg >= 1)
+		return -EINVAL;
+
+	return cx20442->reg_cache;
+}
+
+enum v253_vls {
+	V253_VLS_NONE = 0,
+	V253_VLS_T,
+	V253_VLS_L,
+	V253_VLS_LT,
+	V253_VLS_S,
+	V253_VLS_ST,
+	V253_VLS_M,
+	V253_VLS_MST,
+	V253_VLS_S1,
+	V253_VLS_S1T,
+	V253_VLS_MS1T,
+	V253_VLS_M1,
+	V253_VLS_M1ST,
+	V253_VLS_M1S1T,
+	V253_VLS_H,
+	V253_VLS_HT,
+	V253_VLS_MS,
+	V253_VLS_MS1,
+	V253_VLS_M1S,
+	V253_VLS_M1S1,
+	V253_VLS_TEST,
+};
+
+static int cx20442_pm_to_v253_vls(u8 value)
+{
+	switch (value & ~(1 << CX20442_AGC)) {
+	case 0:
+		return V253_VLS_T;
+	case (1 << CX20442_SPKOUT):
+	case (1 << CX20442_MIC):
+	case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
+		return V253_VLS_M1S1;
+	case (1 << CX20442_TELOUT):
+	case (1 << CX20442_TELIN):
+	case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
+		return V253_VLS_L;
+	case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
+		return V253_VLS_NONE;
+	}
+	return -EINVAL;
+}
+static int cx20442_pm_to_v253_vsp(u8 value)
+{
+	switch (value & ~(1 << CX20442_AGC)) {
+	case (1 << CX20442_SPKOUT):
+	case (1 << CX20442_MIC):
+	case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
+		return (bool)(value & (1 << CX20442_AGC));
+	}
+	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
+}
+
+static int cx20442_write(struct snd_soc_component *component, unsigned int reg,
+							unsigned int value)
+{
+	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
+	int vls, vsp, old, len;
+	char buf[18];
+
+	if (reg >= 1)
+		return -EINVAL;
+
+	/* tty and write pointers required for talking to the modem
+	 * are expected to be set by the line discipline initialization code */
+	if (!cx20442->tty || !cx20442->tty->ops->write)
+		return -EIO;
+
+	old = cx20442->reg_cache;
+	cx20442->reg_cache = value;
+
+	vls = cx20442_pm_to_v253_vls(value);
+	if (vls < 0)
+		return vls;
+
+	vsp = cx20442_pm_to_v253_vsp(value);
+	if (vsp < 0)
+		return vsp;
+
+	if ((vls == V253_VLS_T) ||
+			(vls == cx20442_pm_to_v253_vls(old))) {
+		if (vsp == cx20442_pm_to_v253_vsp(old))
+			return 0;
+		len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
+	} else if (vsp == cx20442_pm_to_v253_vsp(old))
+		len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
+	else
+		len = snprintf(buf, ARRAY_SIZE(buf),
+					"at+vls=%d;+vsp=%d\r", vls, vsp);
+
+	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
+		return -ENOMEM;
+
+	dev_dbg(component->dev, "%s: %s\n", __func__, buf);
+	if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
+		return -EIO;
+
+	return 0;
+}
+
+/*
+ * Line discpline related code
+ *
+ * Any of the callback functions below can be used in two ways:
+ * 1) registerd by a machine driver as one of line discipline operations,
+ * 2) called from a machine's provided line discipline callback function
+ *    in case when extra machine specific code must be run as well.
+ */
+
+/* Modem init: echo off, digital speaker off, quiet off, voice mode */
+static const char *v253_init = "ate0m0q0+fclass=8\r";
+
+/* Line discipline .open() */
+static int v253_open(struct tty_struct *tty)
+{
+	int ret, len = strlen(v253_init);
+
+	/* Doesn't make sense without write callback */
+	if (!tty->ops->write)
+		return -EINVAL;
+
+	/* Won't work if no codec pointer has been passed by a card driver */
+	if (!tty->disc_data)
+		return -ENODEV;
+
+	tty->receive_room = 16;
+	if (tty->ops->write(tty, v253_init, len) != len) {
+		ret = -EIO;
+		goto err;
+	}
+	/* Actual setup will be performed after the modem responds. */
+	return 0;
+err:
+	tty->disc_data = NULL;
+	return ret;
+}
+
+/* Line discipline .close() */
+static void v253_close(struct tty_struct *tty)
+{
+	struct snd_soc_component *component = tty->disc_data;
+	struct cx20442_priv *cx20442;
+
+	tty->disc_data = NULL;
+
+	if (!component)
+		return;
+
+	cx20442 = snd_soc_component_get_drvdata(component);
+
+	/* Prevent the codec driver from further accessing the modem */
+	cx20442->tty = NULL;
+	component->card->pop_time = 0;
+}
+
+/* Line discipline .hangup() */
+static int v253_hangup(struct tty_struct *tty)
+{
+	v253_close(tty);
+	return 0;
+}
+
+/* Line discipline .receive_buf() */
+static void v253_receive(struct tty_struct *tty,
+				const unsigned char *cp, char *fp, int count)
+{
+	struct snd_soc_component *component = tty->disc_data;
+	struct cx20442_priv *cx20442;
+
+	if (!component)
+		return;
+
+	cx20442 = snd_soc_component_get_drvdata(component);
+
+	if (!cx20442->tty) {
+		/* First modem response, complete setup procedure */
+
+		/* Set up codec driver access to modem controls */
+		cx20442->tty = tty;
+		component->card->pop_time = 1;
+	}
+}
+
+/* Line discipline .write_wakeup() */
+static void v253_wakeup(struct tty_struct *tty)
+{
+}
+
+struct tty_ldisc_ops v253_ops = {
+	.magic = TTY_LDISC_MAGIC,
+	.name = "cx20442",
+	.owner = THIS_MODULE,
+	.open = v253_open,
+	.close = v253_close,
+	.hangup = v253_hangup,
+	.receive_buf = v253_receive,
+	.write_wakeup = v253_wakeup,
+};
+EXPORT_SYMBOL_GPL(v253_ops);
+
+
+/*
+ * Codec DAI
+ */
+
+static struct snd_soc_dai_driver cx20442_dai = {
+	.name = "cx20442-voice",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = SNDRV_PCM_RATE_8000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = SNDRV_PCM_RATE_8000,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+};
+
+static int cx20442_set_bias_level(struct snd_soc_component *component,
+		enum snd_soc_bias_level level)
+{
+	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
+	int err = 0;
+
+	switch (level) {
+	case SND_SOC_BIAS_PREPARE:
+		if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY)
+			break;
+		if (IS_ERR(cx20442->por))
+			err = PTR_ERR(cx20442->por);
+		else
+			err = regulator_enable(cx20442->por);
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
+			break;
+		if (IS_ERR(cx20442->por))
+			err = PTR_ERR(cx20442->por);
+		else
+			err = regulator_disable(cx20442->por);
+		break;
+	default:
+		break;
+	}
+
+	return err;
+}
+
+static int cx20442_component_probe(struct snd_soc_component *component)
+{
+	struct cx20442_priv *cx20442;
+
+	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
+	if (cx20442 == NULL)
+		return -ENOMEM;
+
+	cx20442->por = regulator_get(component->dev, "POR");
+	if (IS_ERR(cx20442->por)) {
+		int err = PTR_ERR(cx20442->por);
+
+		dev_warn(component->dev, "failed to get POR supply (%d)", err);
+		/*
+		 * When running on a non-dt platform and requested regulator
+		 * is not available, regulator_get() never returns
+		 * -EPROBE_DEFER as it is not able to justify if the regulator
+		 * may still appear later.  On the other hand, the board can
+		 * still set full constraints flag at late_initcall in order
+		 * to instruct regulator_get() to return a dummy one if
+		 * sufficient.  Hence, if we get -ENODEV here, let's convert
+		 * it to -EPROBE_DEFER and wait for the board to decide or
+		 * let Deferred Probe infrastructure handle this error.
+		 */
+		if (err == -ENODEV)
+			err = -EPROBE_DEFER;
+		kfree(cx20442);
+		return err;
+	}
+
+	cx20442->tty = NULL;
+
+	snd_soc_component_set_drvdata(component, cx20442);
+	component->card->pop_time = 0;
+
+	return 0;
+}
+
+/* power down chip */
+static void cx20442_component_remove(struct snd_soc_component *component)
+{
+	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
+
+	if (cx20442->tty) {
+		struct tty_struct *tty = cx20442->tty;
+		tty_hangup(tty);
+	}
+
+	if (!IS_ERR(cx20442->por)) {
+		/* should be already in STANDBY, hence disabled */
+		regulator_put(cx20442->por);
+	}
+
+	snd_soc_component_set_drvdata(component, NULL);
+	kfree(cx20442);
+}
+
+static const struct snd_soc_component_driver cx20442_component_dev = {
+	.probe			= cx20442_component_probe,
+	.remove			= cx20442_component_remove,
+	.set_bias_level		= cx20442_set_bias_level,
+	.read			= cx20442_read_reg_cache,
+	.write			= cx20442_write,
+	.dapm_widgets		= cx20442_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(cx20442_dapm_widgets),
+	.dapm_routes		= cx20442_audio_map,
+	.num_dapm_routes	= ARRAY_SIZE(cx20442_audio_map),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+	.non_legacy_dai_naming	= 1,
+};
+
+static int cx20442_platform_probe(struct platform_device *pdev)
+{
+	return devm_snd_soc_register_component(&pdev->dev,
+			&cx20442_component_dev, &cx20442_dai, 1);
+}
+
+static struct platform_driver cx20442_platform_driver = {
+	.driver = {
+		.name = "cx20442-codec",
+		},
+	.probe = cx20442_platform_probe,
+};
+
+module_platform_driver(cx20442_platform_driver);
+
+MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
+MODULE_AUTHOR("Janusz Krzysztofik");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:cx20442-codec");