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Subject[PATCH 3/4] platform/chrome: typec: Add USB mux control
Date
Add support to configure various Type C switches appropriately using the
Type C connector class API, when the Chrome OS EC informs the AP that
the USB operating mode has been entered.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
drivers/platform/chrome/cros_ec_typec.c | 100 +++++++++++++++++++++++-
1 file changed, 97 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index d69a88464cef..9ebf9abed16f 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -14,6 +14,7 @@
#include <linux/platform_data/cros_usbpd_notify.h>
#include <linux/platform_device.h>
#include <linux/usb/typec.h>
+#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_mux.h>
#include <linux/usb/role.h>

@@ -30,6 +31,10 @@ struct cros_typec_port {
struct typec_switch *ori_sw;
struct typec_mux *mux;
struct usb_role_switch *role_sw;
+
+ /* Variables keeping track of switch state. */
+ struct typec_mux_state state;
+ uint8_t mux_flags;
};

/* Platform-specific data for the Chrome OS EC Type C controller. */
@@ -264,6 +269,23 @@ static int cros_typec_add_partner(struct cros_typec_data *typec, int port_num,
return ret;
}

+static void cros_typec_remove_partner(struct cros_typec_data *typec,
+ int port_num)
+{
+ struct cros_typec_port *port = typec->ports[port_num];
+
+ port->state.alt = NULL;
+ port->state.mode = TYPEC_STATE_USB;
+ port->state.data = NULL;
+
+ usb_role_switch_set_role(port->role_sw, USB_ROLE_NONE);
+ typec_switch_set(port->ori_sw, TYPEC_ORIENTATION_NONE);
+ typec_mux_set(port->mux, &port->state);
+
+ typec_unregister_partner(port->partner);
+ port->partner = NULL;
+}
+
static void cros_typec_set_port_params_v0(struct cros_typec_data *typec,
int port_num, struct ec_response_usb_pd_control *resp)
{
@@ -317,16 +339,69 @@ static void cros_typec_set_port_params_v1(struct cros_typec_data *typec,
} else {
if (!typec->ports[port_num]->partner)
return;
+ cros_typec_remove_partner(typec, port_num);
+ }
+}
+
+static int cros_typec_get_mux_info(struct cros_typec_data *typec, int port_num,
+ struct ec_response_usb_pd_mux_info *resp)
+{
+ struct ec_params_usb_pd_mux_info req = {
+ .port = port_num,
+ };
+
+ return cros_typec_ec_command(typec, 0, EC_CMD_USB_PD_MUX_INFO, &req,
+ sizeof(req), resp, sizeof(*resp));
+}
+
+static int cros_typec_usb_safe_state(struct cros_typec_port *port)
+{
+ port->state.mode = TYPEC_STATE_SAFE;
+
+ return typec_mux_set(port->mux, &port->state);
+}

- typec_unregister_partner(typec->ports[port_num]->partner);
- typec->ports[port_num]->partner = NULL;
+int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
+ uint8_t mux_flags)
+{
+ struct cros_typec_port *port = typec->ports[port_num];
+ enum typec_orientation orientation;
+ int ret;
+
+ if (!port->partner)
+ return 0;
+
+ if (mux_flags & USB_PD_MUX_POLARITY_INVERTED)
+ orientation = TYPEC_ORIENTATION_REVERSE;
+ else
+ orientation = TYPEC_ORIENTATION_NORMAL;
+
+ ret = typec_switch_set(port->ori_sw, orientation);
+ if (ret)
+ return ret;
+
+ port->state.alt = NULL;
+ port->state.mode = TYPEC_STATE_USB;
+
+ if (mux_flags & USB_PD_MUX_SAFE_MODE)
+ ret = cros_typec_usb_safe_state(port);
+ else if (mux_flags & USB_PD_MUX_USB_ENABLED)
+ ret = typec_mux_set(port->mux, &port->state);
+ else {
+ dev_info(typec->dev,
+ "Unsupported mode requested, mux flags: %x\n",
+ mux_flags);
+ ret = -ENOTSUPP;
}
+
+ return ret;
}

static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
{
struct ec_params_usb_pd_control req;
struct ec_response_usb_pd_control_v1 resp;
+ struct ec_response_usb_pd_mux_info mux_resp;
int ret;

if (port_num < 0 || port_num >= typec->num_ports) {
@@ -357,7 +432,26 @@ static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
cros_typec_set_port_params_v0(typec, port_num,
(struct ec_response_usb_pd_control *) &resp);

- return 0;
+ /* Update the switches if they exist, according to requested state */
+ ret = cros_typec_get_mux_info(typec, port_num, &mux_resp);
+ if (ret < 0) {
+ dev_warn(typec->dev,
+ "Failed to get mux info for port: %d, err = %d\n",
+ port_num, ret);
+ return 0;
+ }
+
+ /* No change needs to be made, let's exit early. */
+ if (typec->ports[port_num]->mux_flags == mux_resp.flags)
+ return 0;
+
+ typec->ports[port_num]->mux_flags = mux_resp.flags;
+ ret = cros_typec_configure_mux(typec, port_num, mux_resp.flags);
+ if (ret)
+ dev_warn(typec->dev, "Configure muxes failed, err = %d\n", ret);
+
+ return usb_role_switch_set_role(typec->ports[port_num]->role_sw,
+ !!(resp.role & PD_CTRL_RESP_ROLE_DATA));
}

static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
--
2.27.0.rc0.183.gde8f92d652-goog
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