Commit bf7571c0 authored by Marek Vasut's avatar Marek Vasut Committed by Chanwoo Choi
Browse files

extcon: usbc-tusb320: Add USB TYPE-C support 



The TI TUSB320 seems like a better fit for USB TYPE-C subsystem,
which can expose details collected by the TUSB320 in a far more
precise way than extcon. Since there are existing users in the
kernel and in DT which depend on the extcon interface, keep it
for now.

Add TYPE-C interface and expose the supported supply current,
direction and connector polarity via the TYPE-C interface.

Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Acked-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: default avatarAlvin Šipraga <alsi@bang-olufsen.dk>
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent 9483811a

drivers/extcon/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -183,7 +183,7 @@ config EXTCON_USBC_CROS_EC 


config EXTCON_USBC_TUSB320

	tristate "TI TUSB320 USB-C extcon support"

	depends on I2C

	depends on I2C && TYPEC

	select REGMAP_I2C

	help

	  Say Y here to enable support for USB Type C cable detection extcon

drivers/extcon/extcon-usbc-tusb320.c

+159 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 * Author: Michael Auchter <michael.auchter@ni.com>

 */



#include <linux/bitfield.h>

#include <linux/extcon-provider.h>

#include <linux/i2c.h>

#include <linux/init.h>
@@ -13,6 +14,24 @@ 
#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/usb/typec.h>



#define TUSB320_REG8				0x8

#define TUSB320_REG8_CURRENT_MODE_ADVERTISE	GENMASK(7, 6)

#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_USB	0x0

#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_15A	0x1

#define TUSB320_REG8_CURRENT_MODE_ADVERTISE_30A	0x2

#define TUSB320_REG8_CURRENT_MODE_DETECT	GENMASK(5, 4)

#define TUSB320_REG8_CURRENT_MODE_DETECT_DEF	0x0

#define TUSB320_REG8_CURRENT_MODE_DETECT_MED	0x1

#define TUSB320_REG8_CURRENT_MODE_DETECT_ACC	0x2

#define TUSB320_REG8_CURRENT_MODE_DETECT_HI	0x3

#define TUSB320_REG8_ACCESSORY_CONNECTED	GENMASK(3, 2)

#define TUSB320_REG8_ACCESSORY_CONNECTED_NONE	0x0

#define TUSB320_REG8_ACCESSORY_CONNECTED_AUDIO	0x4

#define TUSB320_REG8_ACCESSORY_CONNECTED_ACC	0x5

#define TUSB320_REG8_ACCESSORY_CONNECTED_DEBUG	0x6

#define TUSB320_REG8_ACTIVE_CABLE_DETECTION	BIT(0)



#define TUSB320_REG9				0x9

#define TUSB320_REG9_ATTACHED_STATE_SHIFT	6
@@ -55,6 +74,10 @@ struct tusb320_priv { 
	struct extcon_dev *edev;

	struct tusb320_ops *ops;

	enum tusb320_attached_state state;

	struct typec_port *port;

	struct typec_capability	cap;

	enum typec_port_type port_type;

	enum typec_pwr_opmode pwr_opmode;

};



static const char * const tusb_attached_states[] = {
@@ -184,6 +207,44 @@ static struct tusb320_ops tusb320l_ops = { 
	.get_revision = tusb320l_get_revision,

};



static int tusb320_set_adv_pwr_mode(struct tusb320_priv *priv)

{

	u8 mode;



	if (priv->pwr_opmode == TYPEC_PWR_MODE_USB)

		mode = TUSB320_REG8_CURRENT_MODE_ADVERTISE_USB;

	else if (priv->pwr_opmode == TYPEC_PWR_MODE_1_5A)

		mode = TUSB320_REG8_CURRENT_MODE_ADVERTISE_15A;

	else if (priv->pwr_opmode == TYPEC_PWR_MODE_3_0A)

		mode = TUSB320_REG8_CURRENT_MODE_ADVERTISE_30A;

	else	/* No other mode is supported. */

		return -EINVAL;



	return regmap_write_bits(priv->regmap, TUSB320_REG8,

				 TUSB320_REG8_CURRENT_MODE_ADVERTISE,

				 FIELD_PREP(TUSB320_REG8_CURRENT_MODE_ADVERTISE,

					    mode));

}



static int tusb320_port_type_set(struct typec_port *port,

				 enum typec_port_type type)

{

	struct tusb320_priv *priv = typec_get_drvdata(port);



	if (type == TYPEC_PORT_SRC)

		return priv->ops->set_mode(priv, TUSB320_MODE_DFP);

	else if (type == TYPEC_PORT_SNK)

		return priv->ops->set_mode(priv, TUSB320_MODE_UFP);

	else if (type == TYPEC_PORT_DRP)

		return priv->ops->set_mode(priv, TUSB320_MODE_DRP);

	else

		return priv->ops->set_mode(priv, TUSB320_MODE_PORT);

}



static const struct typec_operations tusb320_typec_ops = {

	.port_type_set	= tusb320_port_type_set,

};



static void tusb320_extcon_irq_handler(struct tusb320_priv *priv, u8 reg)

{

	int state, polarity;
@@ -211,6 +272,47 @@ static void tusb320_extcon_irq_handler(struct tusb320_priv *priv, u8 reg) 
	priv->state = state;

}



static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)

{

	struct typec_port *port = priv->port;

	struct device *dev = priv->dev;

	u8 mode, role, state;

	int ret, reg8;

	bool ori;



	ori = reg9 & TUSB320_REG9_CABLE_DIRECTION;

	typec_set_orientation(port, ori ? TYPEC_ORIENTATION_REVERSE :

					  TYPEC_ORIENTATION_NORMAL);



	state = (reg9 >> TUSB320_REG9_ATTACHED_STATE_SHIFT) &

		TUSB320_REG9_ATTACHED_STATE_MASK;

	if (state == TUSB320_ATTACHED_STATE_DFP)

		role = TYPEC_SOURCE;

	else

		role = TYPEC_SINK;



	typec_set_vconn_role(port, role);

	typec_set_pwr_role(port, role);

	typec_set_data_role(port, role == TYPEC_SOURCE ?

				  TYPEC_HOST : TYPEC_DEVICE);



	ret = regmap_read(priv->regmap, TUSB320_REG8, &reg8);

	if (ret) {

		dev_err(dev, "error during reg8 i2c read, ret=%d!\n", ret);

		return;

	}



	mode = FIELD_GET(TUSB320_REG8_CURRENT_MODE_DETECT, reg8);

	if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_DEF)

		typec_set_pwr_opmode(port, TYPEC_PWR_MODE_USB);

	else if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_MED)

		typec_set_pwr_opmode(port, TYPEC_PWR_MODE_1_5A);

	else if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_HI)

		typec_set_pwr_opmode(port, TYPEC_PWR_MODE_3_0A);

	else	/* Charge through accessory */

		typec_set_pwr_opmode(port, TYPEC_PWR_MODE_USB);

}



static irqreturn_t tusb320_irq_handler(int irq, void *dev_id)

{

	struct tusb320_priv *priv = dev_id;
@@ -225,6 +327,7 @@ static irqreturn_t tusb320_irq_handler(int irq, void *dev_id) 
		return IRQ_NONE;



	tusb320_extcon_irq_handler(priv, reg);

	tusb320_typec_irq_handler(priv, reg);



	regmap_write(priv->regmap, TUSB320_REG9, reg);
@@ -260,6 +363,58 @@ static int tusb320_extcon_probe(struct tusb320_priv *priv) 
	return 0;

}



static int tusb320_typec_probe(struct i2c_client *client,

			       struct tusb320_priv *priv)

{

	struct fwnode_handle *connector;

	const char *cap_str;

	int ret;



	/* The Type-C connector is optional, for backward compatibility. */

	connector = device_get_named_child_node(&client->dev, "connector");

	if (!connector)

		return 0;



	/* Type-C connector found. */

	ret = typec_get_fw_cap(&priv->cap, connector);

	if (ret)

		return ret;



	priv->port_type = priv->cap.type;



	/* This goes into register 0x8 field CURRENT_MODE_ADVERTISE */

	ret = fwnode_property_read_string(connector, "typec-power-opmode", &cap_str);

	if (ret)

		return ret;



	ret = typec_find_pwr_opmode(cap_str);

	if (ret < 0)

		return ret;

	if (ret == TYPEC_PWR_MODE_PD)

		return -EINVAL;



	priv->pwr_opmode = ret;



	/* Initialize the hardware with the devicetree settings. */

	ret = tusb320_set_adv_pwr_mode(priv);

	if (ret)

		return ret;



	priv->cap.revision		= USB_TYPEC_REV_1_1;

	priv->cap.accessory[0]		= TYPEC_ACCESSORY_AUDIO;

	priv->cap.accessory[1]		= TYPEC_ACCESSORY_DEBUG;

	priv->cap.orientation_aware	= true;

	priv->cap.driver_data		= priv;

	priv->cap.ops			= &tusb320_typec_ops;

	priv->cap.fwnode		= connector;



	priv->port = typec_register_port(&client->dev, &priv->cap);

	if (IS_ERR(priv->port))

		return PTR_ERR(priv->port);



	return 0;

}



static int tusb320_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{
@@ -300,6 +455,10 @@ static int tusb320_probe(struct i2c_client *client, 
	if (ret)

		return ret;



	ret = tusb320_typec_probe(client, priv);

	if (ret)

		return ret;



	/* update initial state */

	tusb320_irq_handler(client->irq, priv);