Release 4.7 sound/soc/omap/ams-delta.c

/*
 * ams-delta.c  --  SoC audio for Amstrad E3 (Delta) videophone
 *
 * Copyright (C) 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
 *
 * Initially based on sound/soc/omap/osk5912.x
 * Copyright (C) 2008 Mistral Solutions
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/tty.h>
#include <linux/module.h>

#include <sound/soc.h>
#include <sound/jack.h>

#include <asm/mach-types.h>

#include <mach/board-ams-delta.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>

#include "omap-mcbsp.h"
#include "../codecs/cx20442.h"

/* Board specific DAPM widgets */

static const struct snd_soc_dapm_widget ams_delta_dapm_widgets[] = {
	/* Handset */
	SND_SOC_DAPM_MIC("Mouthpiece", NULL),
	SND_SOC_DAPM_HP("Earpiece", NULL),
	/* Handsfree/Speakerphone */
	SND_SOC_DAPM_MIC("Microphone", NULL),
	SND_SOC_DAPM_SPK("Speaker", NULL),
};

/* How they are connected to codec pins */

static const struct snd_soc_dapm_route ams_delta_audio_map[] = {
	{"TELIN", NULL, "Mouthpiece"},
	{"Earpiece", NULL, "TELOUT"},

	{"MIC", NULL, "Microphone"},
	{"Speaker", NULL, "SPKOUT"},
};

/*
 * Controls, functional after the modem line discipline is activated.
 */

/* Virtual switch: audio input/output constellations */

static const char *ams_delta_audio_mode[] =
	{"Mixed", "Handset", "Handsfree", "Speakerphone"};

/* Selection <-> pin translation */

#define AMS_DELTA_MOUTHPIECE	0

#define AMS_DELTA_EARPIECE	1

#define AMS_DELTA_MICROPHONE	2

#define AMS_DELTA_SPEAKER	3

#define AMS_DELTA_AGC		4


#define AMS_DELTA_MIXED		((1 << AMS_DELTA_EARPIECE) | \
                                                (1 << AMS_DELTA_MICROPHONE))

#define AMS_DELTA_HANDSET	((1 << AMS_DELTA_MOUTHPIECE) | \
                                                (1 << AMS_DELTA_EARPIECE))

#define AMS_DELTA_HANDSFREE	((1 << AMS_DELTA_MICROPHONE) | \
                                                (1 << AMS_DELTA_SPEAKER))

#define AMS_DELTA_SPEAKERPHONE	(AMS_DELTA_HANDSFREE | (1 << AMS_DELTA_AGC))


static const unsigned short ams_delta_audio_mode_pins[] = {
	AMS_DELTA_MIXED,
	AMS_DELTA_HANDSET,
	AMS_DELTA_HANDSFREE,
	AMS_DELTA_SPEAKERPHONE,
};


static unsigned short ams_delta_audio_agc;

/*
 * Used for passing a codec structure pointer
 * from the board initialization code to the tty line discipline.
 */

static struct snd_soc_codec *cx20442_codec;



static int ams_delta_set_audio_mode(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
	struct snd_soc_dapm_context *dapm = &card->dapm;
	struct soc_enum *control = (struct soc_enum *)kcontrol->private_value;
	unsigned short pins;
	int pin, changed = 0;

	/* Refuse any mode changes if we are not able to control the codec. */
	if (!cx20442_codec->hw_write)
		return -EUNATCH;

	if (ucontrol->value.enumerated.item[0] >= control->items)
		return -EINVAL;

	snd_soc_dapm_mutex_lock(dapm);

	/* Translate selection to bitmap */
	pins = ams_delta_audio_mode_pins[ucontrol->value.enumerated.item[0]];

	/* Setup pins after corresponding bits if changed */
	pin = !!(pins & (1 << AMS_DELTA_MOUTHPIECE));

	if (pin != snd_soc_dapm_get_pin_status(dapm, "Mouthpiece")) {
		changed = 1;
		if (pin)
			snd_soc_dapm_enable_pin_unlocked(dapm, "Mouthpiece");
		else
			snd_soc_dapm_disable_pin_unlocked(dapm, "Mouthpiece");
	}
	pin = !!(pins & (1 << AMS_DELTA_EARPIECE));
	if (pin != snd_soc_dapm_get_pin_status(dapm, "Earpiece")) {
		changed = 1;
		if (pin)
			snd_soc_dapm_enable_pin_unlocked(dapm, "Earpiece");
		else
			snd_soc_dapm_disable_pin_unlocked(dapm, "Earpiece");
	}
	pin = !!(pins & (1 << AMS_DELTA_MICROPHONE));
	if (pin != snd_soc_dapm_get_pin_status(dapm, "Microphone")) {
		changed = 1;
		if (pin)
			snd_soc_dapm_enable_pin_unlocked(dapm, "Microphone");
		else
			snd_soc_dapm_disable_pin_unlocked(dapm, "Microphone");
	}
	pin = !!(pins & (1 << AMS_DELTA_SPEAKER));
	if (pin != snd_soc_dapm_get_pin_status(dapm, "Speaker")) {
		changed = 1;
		if (pin)
			snd_soc_dapm_enable_pin_unlocked(dapm, "Speaker");
		else
			snd_soc_dapm_disable_pin_unlocked(dapm, "Speaker");
	}
	pin = !!(pins & (1 << AMS_DELTA_AGC));
	if (pin != ams_delta_audio_agc) {
		ams_delta_audio_agc = pin;
		changed = 1;
		if (pin)
			snd_soc_dapm_enable_pin_unlocked(dapm, "AGCIN");
		else
			snd_soc_dapm_disable_pin_unlocked(dapm, "AGCIN");
	}

	if (changed)
		snd_soc_dapm_sync_unlocked(dapm);

	snd_soc_dapm_mutex_unlock(dapm);

	return changed;
}

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static int ams_delta_get_audio_mode(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
	struct snd_soc_dapm_context *dapm = &card->dapm;
	unsigned short pins, mode;

	pins = ((snd_soc_dapm_get_pin_status(dapm, "Mouthpiece") <<
							AMS_DELTA_MOUTHPIECE) |
			(snd_soc_dapm_get_pin_status(dapm, "Earpiece") <<
							AMS_DELTA_EARPIECE));
	if (pins)
		pins |= (snd_soc_dapm_get_pin_status(dapm, "Microphone") <<
							AMS_DELTA_MICROPHONE);
	else
		pins = ((snd_soc_dapm_get_pin_status(dapm, "Microphone") <<
							AMS_DELTA_MICROPHONE) |
			(snd_soc_dapm_get_pin_status(dapm, "Speaker") <<
							AMS_DELTA_SPEAKER) |
			(ams_delta_audio_agc << AMS_DELTA_AGC));

	for (mode = 0; mode < ARRAY_SIZE(ams_delta_audio_mode); mode++)
		if (pins == ams_delta_audio_mode_pins[mode])
			break;

	if (mode >= ARRAY_SIZE(ams_delta_audio_mode))
		return -EINVAL;

	ucontrol->value.enumerated.item[0] = mode;

	return 0;
}

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static const SOC_ENUM_SINGLE_EXT_DECL(ams_delta_audio_enum,
				      ams_delta_audio_mode);


static const struct snd_kcontrol_new ams_delta_audio_controls[] = {
	SOC_ENUM_EXT("Audio Mode", ams_delta_audio_enum,
			ams_delta_get_audio_mode, ams_delta_set_audio_mode),
};

/* Hook switch */

static struct snd_soc_jack ams_delta_hook_switch;

static struct snd_soc_jack_gpio ams_delta_hook_switch_gpios[] = {
	{
		.gpio = 4,
		.name = "hook_switch",
		.report = SND_JACK_HEADSET,
		.invert = 1,
		.debounce_time = 150,
        }
};

/* After we are able to control the codec over the modem,
 * the hook switch can be used for dynamic DAPM reconfiguration. */

static struct snd_soc_jack_pin ams_delta_hook_switch_pins[] = {
	/* Handset */
	{
		.pin = "Mouthpiece",
		.mask = SND_JACK_MICROPHONE,
        },
	{
		.pin = "Earpiece",
		.mask = SND_JACK_HEADPHONE,
        },
	/* Handsfree */
	{
		.pin = "Microphone",
		.mask = SND_JACK_MICROPHONE,
		.invert = 1,
        },
	{
		.pin = "Speaker",
		.mask = SND_JACK_HEADPHONE,
		.invert = 1,
        },
};


/*
 * Modem line discipline, required for making above controls functional.
 * Activated from userspace with ldattach, possibly invoked from udev rule.
 */

/* To actually apply any modem controlled configuration changes to the codec,
 * we must connect codec DAI pins to the modem for a moment.  Be careful not
 * to interfere with our digital mute function that shares the same hardware. */

static struct timer_list cx81801_timer;

static bool cx81801_cmd_pending;

static bool ams_delta_muted;
static DEFINE_SPINLOCK(ams_delta_lock);



static void cx81801_timeout(unsigned long data)
{
	int muted;

	spin_lock(&ams_delta_lock);
	cx81801_cmd_pending = 0;
	muted = ams_delta_muted;
	spin_unlock(&ams_delta_lock);

	/* Reconnect the codec DAI back from the modem to the CPU DAI
         * only if digital mute still off */
	if (!muted)
		ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC, 0);
}

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/* Line discipline .open() */


static int cx81801_open(struct tty_struct *tty)
{
	int ret;

	if (!cx20442_codec)
		return -ENODEV;

	/*
         * Pass the codec structure pointer for use by other ldisc callbacks,
         * both the card and the codec specific parts.
         */
	tty->disc_data = cx20442_codec;

	ret = v253_ops.open(tty);

	if (ret < 0)
		tty->disc_data = NULL;

	return ret;
}

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/* Line discipline .close() */


static void cx81801_close(struct tty_struct *tty)
{
	struct snd_soc_codec *codec = tty->disc_data;
	struct snd_soc_dapm_context *dapm = &codec->component.card->dapm;

	del_timer_sync(&cx81801_timer);

	/* Prevent the hook switch from further changing the DAPM pins */
	INIT_LIST_HEAD(&ams_delta_hook_switch.pins);

	if (!codec)
		return;

	v253_ops.close(tty);

	/* Revert back to default audio input/output constellation */
	snd_soc_dapm_mutex_lock(dapm);

	snd_soc_dapm_disable_pin_unlocked(dapm, "Mouthpiece");
	snd_soc_dapm_enable_pin_unlocked(dapm, "Earpiece");
	snd_soc_dapm_enable_pin_unlocked(dapm, "Microphone");
	snd_soc_dapm_disable_pin_unlocked(dapm, "Speaker");
	snd_soc_dapm_disable_pin_unlocked(dapm, "AGCIN");

	snd_soc_dapm_sync_unlocked(dapm);

	snd_soc_dapm_mutex_unlock(dapm);
}

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/* Line discipline .hangup() */


static int cx81801_hangup(struct tty_struct *tty)
{
	cx81801_close(tty);
	return 0;
}

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/* Line discipline .receive_buf() */


static void cx81801_receive(struct tty_struct *tty,
				const unsigned char *cp, char *fp, int count)
{
	struct snd_soc_codec *codec = tty->disc_data;
	const unsigned char *c;
	int apply, ret;

	if (!codec)
		return;

	if (!codec->hw_write) {
		/* First modem response, complete setup procedure */

		/* Initialize timer used for config pulse generation */
		setup_timer(&cx81801_timer, cx81801_timeout, 0);

		v253_ops.receive_buf(tty, cp, fp, count);

		/* Link hook switch to DAPM pins */
		ret = snd_soc_jack_add_pins(&ams_delta_hook_switch,
					ARRAY_SIZE(ams_delta_hook_switch_pins),
					ams_delta_hook_switch_pins);
		if (ret)
			dev_warn(codec->dev,
				"Failed to link hook switch to DAPM pins, "
				"will continue with hook switch unlinked.\n");

		return;
	}

	v253_ops.receive_buf(tty, cp, fp, count);

	for (c = &cp[count - 1]; c >= cp; c--) {
		if (*c != '\r')
			continue;
		/* Complete modem response received, apply config to codec */

		spin_lock_bh(&ams_delta_lock);
		mod_timer(&cx81801_timer, jiffies + msecs_to_jiffies(150));
		apply = !ams_delta_muted && !cx81801_cmd_pending;
		cx81801_cmd_pending = 1;
		spin_unlock_bh(&ams_delta_lock);

		/* Apply config pulse by connecting the codec to the modem
                 * if not already done */
		if (apply)
			ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC,
						AMS_DELTA_LATCH2_MODEM_CODEC);
		break;
	}
}

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/* Line discipline .write_wakeup() */


static void cx81801_wakeup(struct tty_struct *tty)
{
	v253_ops.write_wakeup(tty);
}

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static struct tty_ldisc_ops cx81801_ops = {
	.magic = TTY_LDISC_MAGIC,
	.name = "cx81801",
	.owner = THIS_MODULE,
	.open = cx81801_open,
	.close = cx81801_close,
	.hangup = cx81801_hangup,
	.receive_buf = cx81801_receive,
	.write_wakeup = cx81801_wakeup,
};


/*
 * Even if not very useful, the sound card can still work without any of the
 * above functonality activated.  You can still control its audio input/output
 * constellation and speakerphone gain from userspace by issuing AT commands
 * over the modem port.
 */


static struct snd_soc_ops ams_delta_ops;


/* Digital mute implemented using modem/CPU multiplexer.
 * Shares hardware with codec config pulse generation */

static bool ams_delta_muted = 1;



static int ams_delta_digital_mute(struct snd_soc_dai *dai, int mute)
{
	int apply;

	if (ams_delta_muted == mute)
		return 0;

	spin_lock_bh(&ams_delta_lock);
	ams_delta_muted = mute;
	apply = !cx81801_cmd_pending;
	spin_unlock_bh(&ams_delta_lock);

	if (apply)
		ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC,
				mute ? AMS_DELTA_LATCH2_MODEM_CODEC : 0);
	return 0;
}

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/* Our codec DAI probably doesn't have its own .ops structure */

static const struct snd_soc_dai_ops ams_delta_dai_ops = {
	.digital_mute = ams_delta_digital_mute,
};

/* Will be used if the codec ever has its own digital_mute function */


static int ams_delta_startup(struct snd_pcm_substream *substream)
{
	return ams_delta_digital_mute(NULL, 0);
}

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static void ams_delta_shutdown(struct snd_pcm_substream *substream)
{
	ams_delta_digital_mute(NULL, 1);
}


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/*
 * Card initialization
 */



static int ams_delta_cx20442_init(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_card *card = rtd->card;
	struct snd_soc_dapm_context *dapm = &card->dapm;
	int ret;
	/* Codec is ready, now add/activate board specific controls */

	/* Store a pointer to the codec structure for tty ldisc use */
	cx20442_codec = rtd->codec;

	/* Set up digital mute if not provided by the codec */
	if (!codec_dai->driver->ops) {
		codec_dai->driver->ops = &ams_delta_dai_ops;
	} else {
		ams_delta_ops.startup = ams_delta_startup;
		ams_delta_ops.shutdown = ams_delta_shutdown;
	}

	/* Add hook switch - can be used to control the codec from userspace
         * even if line discipline fails */
	ret = snd_soc_card_jack_new(card, "hook_switch", SND_JACK_HEADSET,
				    &ams_delta_hook_switch, NULL, 0);
	if (ret)
		dev_warn(card->dev,
				"Failed to allocate resources for hook switch, "
				"will continue without one.\n");
	else {
		ret = snd_soc_jack_add_gpios(&ams_delta_hook_switch,
					ARRAY_SIZE(ams_delta_hook_switch_gpios),
					ams_delta_hook_switch_gpios);
		if (ret)
			dev_warn(card->dev,
				"Failed to set up hook switch GPIO line, "
				"will continue with hook switch inactive.\n");
	}

	/* Register optional line discipline for over the modem control */
	ret = tty_register_ldisc(N_V253, &cx81801_ops);
	if (ret) {
		dev_warn(card->dev,
				"Failed to register line discipline, "
				"will continue without any controls.\n");
		return 0;
	}

	/* Set up initial pin constellation */
	snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
	snd_soc_dapm_disable_pin(dapm, "Speaker");
	snd_soc_dapm_disable_pin(dapm, "AGCIN");
	snd_soc_dapm_disable_pin(dapm, "AGCOUT");

	return 0;
}

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static int ams_delta_card_remove(struct snd_soc_card *card)
{
	snd_soc_jack_free_gpios(&ams_delta_hook_switch,
			ARRAY_SIZE(ams_delta_hook_switch_gpios),
			ams_delta_hook_switch_gpios);

	return 0;
}

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/* DAI glue - connects codec <--> CPU */

static struct snd_soc_dai_link ams_delta_dai_link = {
	.name = "CX20442",
	.stream_name = "CX20442",
	.cpu_dai_name = "omap-mcbsp.1",
	.codec_dai_name = "cx20442-voice",
	.init = ams_delta_cx20442_init,
	.platform_name = "omap-mcbsp.1",
	.codec_name = "cx20442-codec",
	.ops = &ams_delta_ops,
	.dai_fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF |
		   SND_SOC_DAIFMT_CBM_CFM,
};

/* Audio card driver */

static struct snd_soc_card ams_delta_audio_card = {
	.name = "AMS_DELTA",
	.owner = THIS_MODULE,
	.remove = ams_delta_card_remove,
	.dai_link = &ams_delta_dai_link,
	.num_links = 1,

	.controls = ams_delta_audio_controls,
	.num_controls = ARRAY_SIZE(ams_delta_audio_controls),
	.dapm_widgets = ams_delta_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(ams_delta_dapm_widgets),
	.dapm_routes = ams_delta_audio_map,
	.num_dapm_routes = ARRAY_SIZE(ams_delta_audio_map),
};

/* Module init/exit */


static int ams_delta_probe(struct platform_device *pdev)
{
	struct snd_soc_card *card = &ams_delta_audio_card;
	int ret;

	card->dev = &pdev->dev;

	ret = snd_soc_register_card(card);
	if (ret) {
		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
		card->dev = NULL;
		return ret;
	}
	return 0;
}

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Commits
CommitProp
janusz krzysztofik
janusz krzysztofik
68
100.00%
2
100.00%
Total
68
100.00%
2
100.00%



static int ams_delta_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	if (tty_unregister_ldisc(N_V253) != 0)
		dev_warn(&pdev->dev,
			"failed to unregister V253 line discipline\n");

	snd_soc_unregister_card(card);
	card->dev = NULL;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
janusz krzysztofik
janusz krzysztofik
54
100.00%
3
100.00%
Total
54
100.00%
3
100.00%


#define DRV_NAME "ams-delta-audio"


static struct platform_driver ams_delta_driver = {
	.driver = {
		.name = DRV_NAME,
        },
	.probe = ams_delta_probe,
	.remove = ams_delta_remove,
};


module_platform_driver(ams_delta_driver);

MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
MODULE_DESCRIPTION("ALSA SoC driver for Amstrad E3 (Delta) videophone");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
janusz krzysztofik
janusz krzysztofik
1802
85.44%
5
19.23%
liam girdwood
liam girdwood
140
6.64%
2
7.69%
lars-peter clausen
lars-peter clausen
86
4.08%
6
23.08%
stephen warren
stephen warren
30
1.42%
1
3.85%
charles keepax
charles keepax
30
1.42%
1
3.85%
takashi iwai
takashi iwai
6
0.28%
3
11.54%
axel lin
axel lin
5
0.24%
1
3.85%
paul gortmaker
paul gortmaker
3
0.14%
1
3.85%
lucas de marchi
lucas de marchi
2
0.09%
1
3.85%
peter ujfalusi
peter ujfalusi
2
0.09%
2
7.69%
joe perches
joe perches
1
0.05%
1
3.85%
arnd bergmann
arnd bergmann
1
0.05%
1
3.85%
tony lindgren
tony lindgren
1
0.05%
1
3.85%
Total
2109
100.00%
26
100.00%
  
Directory: sound/soc/omap

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