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Commit 2b156d38 authored by Vangala, Amarnath's avatar Vangala, Amarnath
Browse files

fsa4480 : support Ananlog Audio over Type-c USB on holi 



Modify fsa4480 driver to enable AATC on holi.
Switch to iio apis instead of powersupply apis.

Change-Id: Ie8ac623f2a0b3bf54caed5c7e77160221b6b20b6
Signed-off-by: default avatarVangala, Amarnath <avangala@codeaurora.org>
parent 653a9c02

drivers/soc/qcom/fsa4480-i2c.c

+194 −14
Original line number Diff line number Diff line
@@ -4,12 +4,14 @@ 


#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/power_supply.h>

#include <linux/regmap.h>

#include <linux/i2c.h>

#include <linux/mutex.h>

#include <linux/usb/typec.h>

#include <linux/usb/ucsi_glink.h>

#include <linux/soc/qcom/fsa4480-i2c.h>

#include <linux/iio/consumer.h>



#define FSA4480_I2C_NAME	"fsa4480-driver"
@@ -30,11 +32,14 @@ 
struct fsa4480_priv {

	struct regmap *regmap;

	struct device *dev;

	struct notifier_block ucsi_nb;

	struct power_supply *usb_psy;

	struct notifier_block nb;

	struct iio_channel *iio_ch;

	atomic_t usbc_mode;

	struct work_struct usbc_analog_work;

	struct blocking_notifier_head fsa4480_notifier;

	struct mutex notification_lock;

	u32 use_powersupply;

};



struct fsa4480_reg_val {
@@ -76,11 +81,28 @@ static void fsa4480_usbc_update_settings(struct fsa4480_priv *fsa_priv, 
	regmap_write(fsa_priv->regmap, FSA4480_SWITCH_SETTINGS, switch_enable);

}



static int fsa4480_usbc_event_changed(struct notifier_block *nb,

static int fsa4480_usbc_event_changed_psupply(struct fsa4480_priv *fsa_priv,

				      unsigned long evt, void *ptr)

{

	struct device *dev = NULL;



	if (!fsa_priv)

		return -EINVAL;



	dev = fsa_priv->dev;

	if (!dev)

		return -EINVAL;

	dev_dbg(dev, "%s: queueing usbc_analog_work\n",

		__func__);

	pm_stay_awake(fsa_priv->dev);

	queue_work(system_freezable_wq, &fsa_priv->usbc_analog_work);



	return 0;

}



static int fsa4480_usbc_event_changed_ucsi(struct fsa4480_priv *fsa_priv,

				      unsigned long evt, void *ptr)

{

	struct fsa4480_priv *fsa_priv =

			container_of(nb, struct fsa4480_priv, ucsi_nb);

	struct device *dev;

	enum typec_accessory acc = ((struct ucsi_glink_constat_info *)ptr)->acc;
@@ -114,7 +136,85 @@ static int fsa4480_usbc_event_changed(struct notifier_block *nb, 
	return 0;

}



static int fsa4480_usbc_analog_setup_switches(struct fsa4480_priv *fsa_priv)

static int fsa4480_usbc_event_changed(struct notifier_block *nb_ptr,

				      unsigned long evt, void *ptr)

{

	struct fsa4480_priv *fsa_priv =

			container_of(nb_ptr, struct fsa4480_priv, nb);

	struct device *dev;



	if (!fsa_priv)

		return -EINVAL;



	dev = fsa_priv->dev;

	if (!dev)

		return -EINVAL;



	if (fsa_priv->use_powersupply)

		return fsa4480_usbc_event_changed_psupply(fsa_priv, evt, ptr);

	else

		return fsa4480_usbc_event_changed_ucsi(fsa_priv, evt, ptr);

}



static int fsa4480_usbc_analog_setup_switches_psupply(

						struct fsa4480_priv *fsa_priv)

{

	int rc = 0;

	union power_supply_propval mode;

	struct device *dev;



	if (!fsa_priv)

		return -EINVAL;

	dev = fsa_priv->dev;

	if (!dev)

		return -EINVAL;



	rc = iio_read_channel_processed(fsa_priv->iio_ch, &mode.intval);



	mutex_lock(&fsa_priv->notification_lock);

	/* get latest mode again within locked context */

	if (rc < 0) {

		dev_err(dev, "%s: Unable to read USB TYPEC_MODE: %d\n",

			__func__, rc);

		goto done;

	}



	dev_dbg(dev, "%s: setting GPIOs active = %d rcvd intval 0x%X\n",

		__func__, mode.intval != TYPEC_ACCESSORY_NONE, mode.intval);

	if (atomic_read(&(fsa_priv->usbc_mode)) == mode.intval)

		goto done; /* filter notifications received before */

	atomic_set(&(fsa_priv->usbc_mode), mode.intval);



	switch (mode.intval) {

	/* add all modes FSA should notify for in here */

	case TYPEC_ACCESSORY_AUDIO:

		/* activate switches */

		fsa4480_usbc_update_settings(fsa_priv, 0x00, 0x9F);



		/* notify call chain on event */

		blocking_notifier_call_chain(&fsa_priv->fsa4480_notifier,

		mode.intval, NULL);

		break;

	case TYPEC_ACCESSORY_NONE:

		/* notify call chain on event */

		blocking_notifier_call_chain(&fsa_priv->fsa4480_notifier,

				TYPEC_ACCESSORY_NONE, NULL);



		/* deactivate switches */

		fsa4480_usbc_update_settings(fsa_priv, 0x18, 0x98);

		break;

	default:

		/* ignore other usb connection modes */

		break;

	}



done:

	mutex_unlock(&fsa_priv->notification_lock);

	return rc;

}



static int fsa4480_usbc_analog_setup_switches_ucsi(

						struct fsa4480_priv *fsa_priv)

{

	int rc = 0;

	int mode;
@@ -160,6 +260,14 @@ static int fsa4480_usbc_analog_setup_switches(struct fsa4480_priv *fsa_priv) 
	return rc;

}



static int fsa4480_usbc_analog_setup_switches(struct fsa4480_priv *fsa_priv)

{

	if (fsa_priv->use_powersupply)

		return fsa4480_usbc_analog_setup_switches_psupply(fsa_priv);

	else

		return fsa4480_usbc_analog_setup_switches_ucsi(fsa_priv);

}



/*

 * fsa4480_reg_notifier - register notifier block with fsa driver

 *
@@ -210,8 +318,11 @@ EXPORT_SYMBOL(fsa4480_reg_notifier); 
int fsa4480_unreg_notifier(struct notifier_block *nb,

			     struct device_node *node)

{

	int rc = 0;

	struct i2c_client *client = of_find_i2c_device_by_node(node);

	struct fsa4480_priv *fsa_priv;

	struct device *dev;

	union power_supply_propval mode;



	if (!client)

		return -EINVAL;
@@ -219,11 +330,35 @@ int fsa4480_unreg_notifier(struct notifier_block *nb, 
	fsa_priv = (struct fsa4480_priv *)i2c_get_clientdata(client);

	if (!fsa_priv)

		return -EINVAL;

	if (fsa_priv->use_powersupply) {

		dev = fsa_priv->dev;

		if (!dev)

			return -EINVAL;



		mutex_lock(&fsa_priv->notification_lock);

		/* get latest mode within locked context */



		rc = iio_read_channel_processed(fsa_priv->iio_ch, &mode.intval);



		if (rc) {

			dev_dbg(dev, "%s: Unable to read USB TYPEC_MODE: %d\n",

				__func__, rc);

			mutex_unlock(&fsa_priv->notification_lock);

			return rc;

		}

		/* Do not reset switch settings for usb digital hs */

		if (mode.intval == TYPEC_ACCESSORY_AUDIO)

			fsa4480_usbc_update_settings(fsa_priv, 0x18, 0x98);

		rc = blocking_notifier_chain_unregister

					(&fsa_priv->fsa4480_notifier, nb);

		mutex_unlock(&fsa_priv->notification_lock);

	} else {

		fsa4480_usbc_update_settings(fsa_priv, 0x18, 0x98);

	return blocking_notifier_chain_unregister

		rc = blocking_notifier_chain_unregister

				(&fsa_priv->fsa4480_notifier, nb);

	}

	return rc;

}

EXPORT_SYMBOL(fsa4480_unreg_notifier);



static int fsa4480_validate_display_port_settings(struct fsa4480_priv *fsa_priv)
@@ -317,6 +452,7 @@ static int fsa4480_probe(struct i2c_client *i2c, 
			 const struct i2c_device_id *id)

{

	struct fsa4480_priv *fsa_priv;

	u32 use_powersupply = 0;

	int rc = 0;



	fsa_priv = devm_kzalloc(&i2c->dev, sizeof(*fsa_priv),
@@ -324,6 +460,7 @@ static int fsa4480_probe(struct i2c_client *i2c, 
	if (!fsa_priv)

		return -ENOMEM;



	memset(fsa_priv, 0, sizeof(struct fsa4480_priv));

	fsa_priv->dev = &i2c->dev;



	fsa_priv->regmap = devm_regmap_init_i2c(i2c, &fsa4480_regmap_config);
@@ -340,15 +477,50 @@ static int fsa4480_probe(struct i2c_client *i2c, 


	fsa4480_update_reg_defaults(fsa_priv->regmap);



	fsa_priv->ucsi_nb.notifier_call = fsa4480_usbc_event_changed;

	fsa_priv->ucsi_nb.priority = 0;

	rc = register_ucsi_glink_notifier(&fsa_priv->ucsi_nb);

	fsa_priv->nb.notifier_call = fsa4480_usbc_event_changed;

	fsa_priv->nb.priority = 0;

	rc = of_property_read_u32(fsa_priv->dev->of_node,

			"qcom,use-power-supply", &use_powersupply);

	if (rc || use_powersupply == 0) {

		dev_dbg(fsa_priv->dev,

			"%s: Looking up %s property failed or disabled\n",

			__func__, "qcom,use-power-supply");



		fsa_priv->use_powersupply = 0;

		rc = register_ucsi_glink_notifier(&fsa_priv->nb);

		if (rc) {

		dev_err(fsa_priv->dev, "%s: ucsi glink notifier registration failed: %d\n",

			dev_err(fsa_priv->dev,

			  "%s: ucsi glink notifier registration failed: %d\n",

			  __func__, rc);

			goto err_data;

		}

	} else {

		fsa_priv->use_powersupply = 1;

		fsa_priv->usb_psy = power_supply_get_by_name("usb");

		if (!fsa_priv->usb_psy) {

			rc = -EPROBE_DEFER;

			dev_dbg(fsa_priv->dev,

				"%s: could not get USB psy info: %d\n",

				__func__, rc);

			goto err_data;

		}



		fsa_priv->iio_ch = iio_channel_get(fsa_priv->dev, "typec_mode");

		if (!fsa_priv->iio_ch) {

			dev_err(fsa_priv->dev,

				"%s: iio_channel_get failed for typec_mode\n",

				__func__);

			goto err_supply;

		}

		rc = power_supply_reg_notifier(&fsa_priv->nb);

		if (rc) {

			dev_err(fsa_priv->dev,

				"%s: power supply reg failed: %d\n",

			__func__, rc);

			goto err_supply;

		}

	}



	mutex_init(&fsa_priv->notification_lock);

	i2c_set_clientdata(i2c, fsa_priv);
@@ -362,6 +534,8 @@ static int fsa4480_probe(struct i2c_client *i2c, 


	return 0;



err_supply:

	power_supply_put(fsa_priv->usb_psy);

err_data:

	devm_kfree(&i2c->dev, fsa_priv);

	return rc;
@@ -375,7 +549,13 @@ static int fsa4480_remove(struct i2c_client *i2c) 
	if (!fsa_priv)

		return -EINVAL;



	unregister_ucsi_glink_notifier(&fsa_priv->ucsi_nb);

	if (fsa_priv->use_powersupply) {

		/* deregister from PMI */

		power_supply_unreg_notifier(&fsa_priv->nb);

		power_supply_put(fsa_priv->usb_psy);

	} else {

		unregister_ucsi_glink_notifier(&fsa_priv->nb);

	}

	fsa4480_usbc_update_settings(fsa_priv, 0x18, 0x98);

	cancel_work_sync(&fsa_priv->usbc_analog_work);

	pm_relax(fsa_priv->dev);