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Message-Id: <20230315220246.951213-1-alvin@pqrs.dk>
Date: Wed, 15 Mar 2023 23:02:45 +0100
From: Alvin Šipraga <alvin@...s.dk>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
MyungJoo Ham <myungjoo.ham@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>
Cc: linux-usb@...r.kernel.org,
Alvin Šipraga <alsi@...g-olufsen.dk>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] extcon: usbc-tusb320: add accessory detection support
From: Alvin Šipraga <alsi@...g-olufsen.dk>
The TUSB320 can detect the following types of accessory:
- Audio Accessory
- Audio Accessory with charge-thru
- Debug Accessory (DFP)
- Debug Accessory (UFP)
Moreover, the typec subsystem can be informed of this through the
typec_set_mode() function. The information will be propagated to any
linked typec muxes. Add the necessary support to the driver.
Note that for the Debug Accessory modes, an educated guess was made that
for the USB data role, DFP implies HOST and UFP implies DEVICE. But this
might want to be made configurable at a later date.
Signed-off-by: Alvin Šipraga <alsi@...g-olufsen.dk>
---
drivers/extcon/extcon-usbc-tusb320.c | 90 +++++++++++++++++++++-------
1 file changed, 68 insertions(+), 22 deletions(-)
diff --git a/drivers/extcon/extcon-usbc-tusb320.c b/drivers/extcon/extcon-usbc-tusb320.c
index 10dff1c512c4..882d1f48495e 100644
--- a/drivers/extcon/extcon-usbc-tusb320.c
+++ b/drivers/extcon/extcon-usbc-tusb320.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/usb/typec.h>
+#include <linux/usb/typec_altmode.h>
#define TUSB320_REG8 0x8
#define TUSB320_REG8_CURRENT_MODE_ADVERTISE GENMASK(7, 6)
@@ -26,16 +27,16 @@
#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 GENMASK(3, 1)
#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_ACCESSORY_CONNECTED_ACHRG 0x5
+#define TUSB320_REG8_ACCESSORY_CONNECTED_DBGDFP 0x6
+#define TUSB320_REG8_ACCESSORY_CONNECTED_DBGUFP 0x7
#define TUSB320_REG8_ACTIVE_CABLE_DETECTION BIT(0)
#define TUSB320_REG9 0x9
-#define TUSB320_REG9_ATTACHED_STATE_SHIFT 6
-#define TUSB320_REG9_ATTACHED_STATE_MASK 0x3
+#define TUSB320_REG9_ATTACHED_STATE GENMASK(7, 6)
#define TUSB320_REG9_CABLE_DIRECTION BIT(5)
#define TUSB320_REG9_INTERRUPT_STATUS BIT(4)
@@ -250,8 +251,7 @@ static void tusb320_extcon_irq_handler(struct tusb320_priv *priv, u8 reg)
{
int state, polarity;
- state = (reg >> TUSB320_REG9_ATTACHED_STATE_SHIFT) &
- TUSB320_REG9_ATTACHED_STATE_MASK;
+ state = FIELD_GET(TUSB320_REG9_ATTACHED_STATE, reg);
polarity = !!(reg & TUSB320_REG9_CABLE_DIRECTION);
dev_dbg(priv->dev, "attached state: %s, polarity: %d\n",
@@ -277,32 +277,78 @@ 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 typec_mode;
+ enum typec_role pwr_role;
+ enum typec_data_role data_role;
+ u8 state, mode, accessory;
int ret, reg8;
bool ori;
+ ret = regmap_read(priv->regmap, TUSB320_REG8, ®8);
+ if (ret) {
+ dev_err(dev, "error during reg8 i2c read, ret=%d!\n", ret);
+ return;
+ }
+
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;
+ state = FIELD_GET(TUSB320_REG9_ATTACHED_STATE, reg9);
+ accessory = FIELD_GET(TUSB320_REG8_ACCESSORY_CONNECTED, reg8);
+
+ switch (state) {
+ case TUSB320_ATTACHED_STATE_DFP:
+ typec_mode = TYPEC_MODE_USB2;
+ pwr_role = TYPEC_SOURCE;
+ data_role = TYPEC_HOST;
+ break;
+ case TUSB320_ATTACHED_STATE_UFP:
+ typec_mode = TYPEC_MODE_USB2;
+ pwr_role = TYPEC_SINK;
+ data_role = TYPEC_DEVICE;
+ break;
+ case TUSB320_ATTACHED_STATE_ACC:
+ /*
+ * Accessory detected. For debug accessories, just make some
+ * qualified guesses as to the role for lack of a better option.
+ */
+ if (accessory == TUSB320_REG8_ACCESSORY_CONNECTED_AUDIO ||
+ accessory == TUSB320_REG8_ACCESSORY_CONNECTED_ACHRG) {
+ typec_mode = TYPEC_MODE_AUDIO;
+ pwr_role = TYPEC_SINK;
+ data_role = TYPEC_DEVICE;
+ break;
+ } else if (accessory ==
+ TUSB320_REG8_ACCESSORY_CONNECTED_DBGDFP) {
+ typec_mode = TYPEC_MODE_DEBUG;
+ pwr_role = TYPEC_SOURCE;
+ data_role = TYPEC_HOST;
+ break;
+ } else if (accessory ==
+ TUSB320_REG8_ACCESSORY_CONNECTED_DBGUFP) {
+ typec_mode = TYPEC_MODE_DEBUG;
+ pwr_role = TYPEC_SINK;
+ data_role = TYPEC_DEVICE;
+ break;
+ }
- typec_set_vconn_role(port, role);
- typec_set_pwr_role(port, role);
- typec_set_data_role(port, role == TYPEC_SOURCE ?
- TYPEC_HOST : TYPEC_DEVICE);
+ dev_warn(priv->dev, "unexpected ACCESSORY_CONNECTED state %d\n",
+ accessory);
- ret = regmap_read(priv->regmap, TUSB320_REG8, ®8);
- if (ret) {
- dev_err(dev, "error during reg8 i2c read, ret=%d!\n", ret);
- return;
+ fallthrough;
+ default:
+ typec_mode = TYPEC_MODE_USB2;
+ pwr_role = TYPEC_SINK;
+ data_role = TYPEC_DEVICE;
+ break;
}
+ typec_set_vconn_role(port, pwr_role);
+ typec_set_pwr_role(port, pwr_role);
+ typec_set_data_role(port, data_role);
+ typec_set_mode(port, typec_mode);
+
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);
--
2.39.2
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