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Message-ID: <20240228220352.3614262-1-jthies@google.com>
Date: Wed, 28 Feb 2024 22:03:52 +0000
From: Jameson Thies <jthies@...gle.com>
To: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org
Cc: jthies@...gle.com, pmalani@...omium.org, bleung@...gle.com,
abhishekpandit@...omium.org, andersson@...nel.org,
dmitry.baryshkov@...aro.org, fabrice.gasnier@...s.st.com,
gregkh@...uxfoundation.org, hdegoede@...hat.com, neil.armstrong@...aro.org,
rajaram.regupathy@...el.com, saranya.gopal@...el.com,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] usb: typec: ucsi: Register SOP/SOP' Discover Identity Responses
Register SOP and SOP' Discover Identity responses with the USB Type-C
Connector Class as partner and cable identities, respectively. Discover
Identity responses are requested from the PPM using the GET_PD_MESSAGE
UCSI command.
Signed-off-by: Jameson Thies <jthies@...gle.com>
---
GET_PD_MESSAGE responses from the PPM populate partner and cable
identity in sysfs:
nospike-rev4 /sys/class/typec # ls port0-partner/identity/
cert_stat id_header product product_type_vdo1 product_type_vdo2
product_type_vdo3
nospike-rev4 /sys/class/typec # ls port0-cable/identity/
cert_stat id_header product product_type_vdo1 product_type_vdo2
product_type_vdo3
Changes in v2:
- Re-ordered memset call and null assignment when unregistering partners
and cables.
- Supports registering partner and cable identity with UCSI versions
before v2.0.
- Shortened lines to within 80 characters with the exception of two
error log lines with three indentations.
- Tested on usb-testing branch merged with chromeOS 6.8-rc2 kernel.
drivers/usb/typec/ucsi/ucsi.c | 125 ++++++++++++++++++++++++++++++++++
drivers/usb/typec/ucsi/ucsi.h | 29 ++++++++
2 files changed, 154 insertions(+)
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 7c84687b5d1a3..4088422b33c74 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -646,6 +646,121 @@ static int ucsi_get_src_pdos(struct ucsi_connector *con)
return ret;
}
+static int ucsi_read_identity(struct ucsi_connector *con, u8 recipient,
+ struct usb_pd_identity *id)
+{
+ struct ucsi *ucsi = con->ucsi;
+ struct ucsi_pd_message_disc_id resp = {};
+ u64 command;
+ int ret;
+
+ if (ucsi->version < UCSI_VERSION_2_0) {
+ /*
+ * Before UCSI v2.0, MESSAGE_IN is 16 bytes which cannot fit
+ * the 28 byte identity response including the VDM header.
+ * First request the VDM header, ID Header VDO, Cert Stat VDO
+ * and Product VDO.
+ */
+ command = UCSI_COMMAND(UCSI_GET_PD_MESSAGE) |
+ UCSI_CONNECTOR_NUMBER(con->num);
+ command |= UCSI_GET_PD_MESSAGE_RECIPIENT(recipient);
+ command |= UCSI_GET_PD_MESSAGE_OFFSET(0);
+ command |= UCSI_GET_PD_MESSAGE_BYTES(0x10);
+ command |= UCSI_GET_PD_MESSAGE_TYPE(
+ UCSI_GET_PD_MESSAGE_TYPE_IDENTITY);
+
+ ret = ucsi_send_command(ucsi, command, &resp, 0x10);
+ if (ret < 0) {
+ dev_err(ucsi->dev,
+ "UCSI_GET_PD_MESSAGE v1.2 failed first request (%d)\n",
+ ret);
+ return ret;
+ }
+
+ /* Then request Product Type VDO1 through Product Type VDO3. */
+ command = UCSI_COMMAND(UCSI_GET_PD_MESSAGE) |
+ UCSI_CONNECTOR_NUMBER(con->num);
+ command |= UCSI_GET_PD_MESSAGE_RECIPIENT(recipient);
+ command |= UCSI_GET_PD_MESSAGE_OFFSET(0x10);
+ command |= UCSI_GET_PD_MESSAGE_BYTES(0xc);
+ command |= UCSI_GET_PD_MESSAGE_TYPE(
+ UCSI_GET_PD_MESSAGE_TYPE_IDENTITY);
+
+ ret = ucsi_send_command(ucsi, command, &resp.vdo[0], 0xc);
+ if (ret < 0) {
+ dev_err(ucsi->dev,
+ "UCSI_GET_PD_MESSAGE v1.2 failed second request (%d)\n",
+ ret);
+ return ret;
+ }
+ } else {
+ /*
+ * In UCSI v2.0 and after, MESSAGE_IN is large enough to request
+ * the large enough to request the full Discover Identity
+ * response at once.
+ */
+ command = UCSI_COMMAND(UCSI_GET_PD_MESSAGE) |
+ UCSI_CONNECTOR_NUMBER(con->num);
+ command |= UCSI_GET_PD_MESSAGE_RECIPIENT(recipient);
+ /* VDM Header + 6 VDOs (0x1c bytes) without an offset */
+ command |= UCSI_GET_PD_MESSAGE_OFFSET(0);
+ command |= UCSI_GET_PD_MESSAGE_BYTES(0x1c);
+ command |= UCSI_GET_PD_MESSAGE_TYPE(
+ UCSI_GET_PD_MESSAGE_TYPE_IDENTITY);
+
+ ret = ucsi_send_command(ucsi, command, &resp, sizeof(resp));
+ if (ret < 0) {
+ dev_err(ucsi->dev, "UCSI_GET_PD_MESSAGE failed (%d)\n",
+ ret);
+ return ret;
+ }
+ }
+
+ id->id_header = resp.id_header;
+ id->cert_stat = resp.cert_stat;
+ id->product = resp.product;
+ id->vdo[0] = resp.vdo[0];
+ id->vdo[1] = resp.vdo[1];
+ id->vdo[2] = resp.vdo[2];
+ return 0;
+}
+
+static int ucsi_get_partner_identity(struct ucsi_connector *con)
+{
+ int ret;
+
+ ret = ucsi_read_identity(con, UCSI_RECIPIENT_SOP,
+ &con->partner_identity);
+ if (ret < 0)
+ return ret;
+
+ ret = typec_partner_set_identity(con->partner);
+ if (ret < 0) {
+ dev_err(con->ucsi->dev, "Failed to set partner identity (%d)\n",
+ ret);
+ }
+
+ return ret;
+}
+
+static int ucsi_get_cable_identity(struct ucsi_connector *con)
+{
+ int ret;
+
+ ret = ucsi_read_identity(con, UCSI_RECIPIENT_SOP_P,
+ &con->cable_identity);
+ if (ret < 0)
+ return ret;
+
+ ret = typec_cable_set_identity(con->cable);
+ if (ret < 0) {
+ dev_err(con->ucsi->dev, "Failed to set cable identity (%d)\n",
+ ret);
+ }
+
+ return ret;
+}
+
static int ucsi_check_altmodes(struct ucsi_connector *con)
{
int ret, num_partner_am;
@@ -754,6 +869,7 @@ static int ucsi_register_cable(struct ucsi_connector *con)
break;
}
+ desc.identity = &con->cable_identity;
desc.active = !!(UCSI_CABLE_PROP_FLAG_ACTIVE_CABLE &
con->cable_prop.flags);
desc.pd_revision = UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(
@@ -777,6 +893,7 @@ static void ucsi_unregister_cable(struct ucsi_connector *con)
return;
typec_unregister_cable(con->cable);
+ memset(&con->cable_identity, 0, sizeof(con->cable_identity));
con->cable = NULL;
}
@@ -827,6 +944,7 @@ static int ucsi_register_partner(struct ucsi_connector *con)
break;
}
+ desc.identity = &con->partner_identity;
desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
desc.pd_revision = UCSI_CONCAP_FLAG_PARTNER_PD_MAJOR_REV_AS_BCD(con->cap.flags);
@@ -855,6 +973,7 @@ static void ucsi_unregister_partner(struct ucsi_connector *con)
ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
ucsi_unregister_cable(con);
typec_unregister_partner(con->partner);
+ memset(&con->partner_identity, 0, sizeof(con->partner_identity));
con->partner = NULL;
}
@@ -975,6 +1094,10 @@ static int ucsi_check_cable(struct ucsi_connector *con)
if (ret < 0)
return ret;
+ ret = ucsi_get_cable_identity(con);
+ if (ret < 0)
+ return ret;
+
return 0;
}
@@ -1019,6 +1142,7 @@ static void ucsi_handle_connector_change(struct work_struct *work)
ucsi_register_partner(con);
ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
+ ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
@@ -1418,6 +1542,7 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
ucsi_register_partner(con);
ucsi_pwr_opmode_change(con);
ucsi_port_psy_changed(con);
+ ucsi_get_partner_identity(con);
ucsi_check_cable(con);
}
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index f0aabef0b7c64..b89fae82e8ce7 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -106,6 +106,7 @@ void ucsi_connector_change(struct ucsi *ucsi, u8 num);
#define UCSI_GET_CABLE_PROPERTY 0x11
#define UCSI_GET_CONNECTOR_STATUS 0x12
#define UCSI_GET_ERROR_STATUS 0x13
+#define UCSI_GET_PD_MESSAGE 0x15
#define UCSI_CONNECTOR_NUMBER(_num_) ((u64)(_num_) << 16)
#define UCSI_COMMAND(_cmd_) ((_cmd_) & 0xff)
@@ -159,6 +160,18 @@ void ucsi_connector_change(struct ucsi *ucsi, u8 num);
#define UCSI_MAX_PDOS (4)
#define UCSI_GET_PDOS_SRC_PDOS ((u64)1 << 34)
+/* GET_PD_MESSAGE command bits */
+#define UCSI_GET_PD_MESSAGE_RECIPIENT(_r_) ((u64)(_r_) << 23)
+#define UCSI_GET_PD_MESSAGE_OFFSET(_r_) ((u64)(_r_) << 26)
+#define UCSI_GET_PD_MESSAGE_BYTES(_r_) ((u64)(_r_) << 34)
+#define UCSI_GET_PD_MESSAGE_TYPE(_r_) ((u64)(_r_) << 42)
+#define UCSI_GET_PD_MESSAGE_TYPE_SNK_CAP_EXT 0
+#define UCSI_GET_PD_MESSAGE_TYPE_SRC_CAP_EXT 1
+#define UCSI_GET_PD_MESSAGE_TYPE_BAT_CAP 2
+#define UCSI_GET_PD_MESSAGE_TYPE_BAT_STAT 3
+#define UCSI_GET_PD_MESSAGE_TYPE_IDENTITY 4
+#define UCSI_GET_PD_MESSAGE_TYPE_REVISION 5
+
/* -------------------------------------------------------------------------- */
/* Error information returned by PPM in response to GET_ERROR_STATUS command. */
@@ -338,6 +351,18 @@ struct ucsi_connector_status {
((get_unaligned_le32(&(_p_)[5]) & GENMASK(16, 1)) >> 1)
} __packed;
+/*
+ * Data structure filled by PPM in response to GET_PD_MESSAGE command with the
+ * Response Message Type set to Discover Identity Response.
+ */
+struct ucsi_pd_message_disc_id {
+ u32 vdm_header;
+ u32 id_header;
+ u32 cert_stat;
+ u32 product;
+ u32 vdo[3];
+} __packed;
+
/* -------------------------------------------------------------------------- */
struct ucsi_debugfs_entry {
@@ -428,6 +453,10 @@ struct ucsi_connector {
struct usb_power_delivery_capabilities *partner_sink_caps;
struct usb_role_switch *usb_role_sw;
+
+ /* USB PD identity */
+ struct usb_pd_identity partner_identity;
+ struct usb_pd_identity cable_identity;
};
int ucsi_send_command(struct ucsi *ucsi, u64 command,
--
2.44.0.rc1.240.g4c46232300-goog
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