[PATCH 1/4] usb: typec: tcpm: Add callback to notify pd_capable partner

[Badhri Jagan Sridharan]

This change informs lower level tcpc drivers of pd_capable
partner. This is useful while setting current limit for the
charging path.

Signed-off-by: Badhri Jagan Sridharan <bad...@google.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 20 +++++++++++++++-----
 include/linux/usb/tcpm.h      |  3 +++
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 11d0c40bc47d..e9886e850b84 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -952,6 +952,16 @@ static int tcpm_set_current_limit(struct tcpm_port *port, 
u32 max_ma, u32 mv)
        return ret;
 }
 
+static void tcpm_set_pd_capable(struct tcpm_port *port, bool capable)
+{
+       tcpm_log(port, "Partner pd capable %s", capable ? "true" : "false");
+
+       if (port->tcpc->set_pd_capable)
+               port->tcpc->set_pd_capable(port->tcpc, capable);
+
+       port->pd_capable = capable;
+}
+
 static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
 {
        return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
@@ -3444,7 +3454,7 @@ static int tcpm_src_attach(struct tcpm_port *port)
        if (ret < 0)
                goto out_disable_vconn;
 
-       port->pd_capable = false;
+       tcpm_set_pd_capable(port, false);
 
        port->partner = NULL;
 
@@ -3509,7 +3519,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
        tcpm_unregister_altmodes(port);
        tcpm_typec_disconnect(port);
        port->attached = false;
-       port->pd_capable = false;
+       tcpm_set_pd_capable(port, false);
        port->pps_data.supported = false;
        tcpm_set_partner_usb_comm_capable(port, false);
 
@@ -3583,7 +3593,7 @@ static int tcpm_snk_attach(struct tcpm_port *port)
        if (ret < 0)
                return ret;
 
-       port->pd_capable = false;
+       tcpm_set_pd_capable(port, false);
 
        port->partner = NULL;
 
@@ -3813,7 +3823,7 @@ static void run_state_machine(struct tcpm_port *port)
                         */
                        /* port->hard_reset_count = 0; */
                        port->caps_count = 0;
-                       port->pd_capable = true;
+                       tcpm_set_pd_capable(port, true);
                        tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
                                            PD_T_SEND_SOURCE_CAP);
                }
@@ -4074,7 +4084,7 @@ static void run_state_machine(struct tcpm_port *port)
                }
                break;
        case SNK_NEGOTIATE_CAPABILITIES:
-               port->pd_capable = true;
+               tcpm_set_pd_capable(port, true);
                tcpm_set_partner_usb_comm_capable(port,
                                                  !!(port->source_caps[0] & 
PDO_FIXED_USB_COMM));
                port->hard_reset_count = 0;
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 42fcfbe10590..d5d7293bc34d 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -112,6 +112,8 @@ enum tcpm_transmit_type {
  *              Optional; The USB Communications Capable bit indicates if port
  *              partner is capable of communication over the USB data lines
  *              (e.g. D+/- or SS Tx/Rx). Called to notify the status of the 
bit.
+ * @set_pd_capable:
+ *             Optional; Called to notify if the partner is pd capable.
  */
 struct tcpc_dev {
        struct fwnode_handle *fwnode;
@@ -144,6 +146,7 @@ struct tcpc_dev {
                                                 bool pps_active, u32 
requested_vbus_voltage);
        bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);
        void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable);
+       void (*set_pd_capable)(struct tcpc_dev *dev, bool enable);
 };
 
 struct tcpm_port;
-- 
2.31.0.rc2.261.g7f71774620-goog