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extcon: usbc-tusb320: add usb_role_switch support

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The connector child node of the TUSB320 device might be linked with a
dual-role capable USB controller. Add driver support for detecting a
usb_role_switch and setting its state in the typec interrupt handler.
This follows similar practice in other drivers in the typec subsystem,
which this extcon driver can opt-in to.

Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Alvin Šipraga 2023-03-18 16:05:54 +01:00 committed by Chanwoo Choi
parent 18eb81d804
commit df101446a4
1 changed files with 21 additions and 0 deletions
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21
drivers/extcon/extcon-usbc-tusb320.c
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@ -16,6 +16,7 @@
#include <linux/regmap.h>
#include <linux/usb/typec.h>
#include <linux/usb/typec_altmode.h>
#include <linux/usb/role.h>
#define TUSB320_REG8 0x8
#define TUSB320_REG8_CURRENT_MODE_ADVERTISE GENMASK(7, 6)
@ -80,6 +81,7 @@ struct tusb320_priv {
enum typec_port_type port_type;
enum typec_pwr_opmode pwr_opmode;
struct fwnode_handle *connector_fwnode;
struct usb_role_switch *role_sw;
};
static const char * const tusb_attached_states[] = {
@ -278,6 +280,7 @@ static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
struct typec_port *port = priv->port;
struct device *dev = priv->dev;
int typec_mode;
enum usb_role usb_role;
enum typec_role pwr_role;
enum typec_data_role data_role;
u8 state, mode, accessory;
@ -300,11 +303,13 @@ static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
switch (state) {
case TUSB320_ATTACHED_STATE_DFP:
typec_mode = TYPEC_MODE_USB2;
usb_role = USB_ROLE_HOST;
pwr_role = TYPEC_SOURCE;
data_role = TYPEC_HOST;
break;
case TUSB320_ATTACHED_STATE_UFP:
typec_mode = TYPEC_MODE_USB2;
usb_role = USB_ROLE_DEVICE;
pwr_role = TYPEC_SINK;
data_role = TYPEC_DEVICE;
break;
@ -316,6 +321,7 @@ static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
if (accessory == TUSB320_REG8_ACCESSORY_CONNECTED_AUDIO ||
accessory == TUSB320_REG8_ACCESSORY_CONNECTED_ACHRG) {
typec_mode = TYPEC_MODE_AUDIO;
usb_role = USB_ROLE_NONE;
pwr_role = TYPEC_SINK;
data_role = TYPEC_DEVICE;
break;
@ -323,12 +329,14 @@ static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
TUSB320_REG8_ACCESSORY_CONNECTED_DBGDFP) {
typec_mode = TYPEC_MODE_DEBUG;
pwr_role = TYPEC_SOURCE;
usb_role = USB_ROLE_HOST;
data_role = TYPEC_HOST;
break;
} else if (accessory ==
TUSB320_REG8_ACCESSORY_CONNECTED_DBGUFP) {
typec_mode = TYPEC_MODE_DEBUG;
pwr_role = TYPEC_SINK;
usb_role = USB_ROLE_DEVICE;
data_role = TYPEC_DEVICE;
break;
}
@ -339,6 +347,7 @@ static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
fallthrough;
default:
typec_mode = TYPEC_MODE_USB2;
usb_role = USB_ROLE_NONE;
pwr_role = TYPEC_SINK;
data_role = TYPEC_DEVICE;
break;
@ -348,6 +357,7 @@ static void tusb320_typec_irq_handler(struct tusb320_priv *priv, u8 reg9)
typec_set_pwr_role(port, pwr_role);
typec_set_data_role(port, data_role);
typec_set_mode(port, typec_mode);
usb_role_switch_set_role(priv->role_sw, usb_role);
mode = FIELD_GET(TUSB320_REG8_CURRENT_MODE_DETECT, reg8);
if (mode == TUSB320_REG8_CURRENT_MODE_DETECT_DEF)
@ -472,10 +482,20 @@ static int tusb320_typec_probe(struct i2c_client *client,
goto err_put;
}
/* Find any optional USB role switch that needs reporting to */
priv->role_sw = fwnode_usb_role_switch_get(connector);
if (IS_ERR(priv->role_sw)) {
ret = PTR_ERR(priv->role_sw);
goto err_unreg;
}
priv->connector_fwnode = connector;
return 0;
err_unreg:
typec_unregister_port(priv->port);
err_put:
fwnode_handle_put(connector);
@ -484,6 +504,7 @@ err_put:
static void tusb320_typec_remove(struct tusb320_priv *priv)
{
usb_role_switch_put(priv->role_sw);
typec_unregister_port(priv->port);
fwnode_handle_put(priv->connector_fwnode);
}