platform/chrome: cros_typec_vdm: Add VDM send support

Add support to send generic VDM messages from the alt mode driver to the
partner (via the ChromeOS EC). The function introduced here is intended
to be called by the alt mode driver (via the Type-C bus logic).

Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20221228004648.793339-11-pmalani@chromium.org

diff --git a/drivers/platform/chrome/cros_typec_vdm.c b/drivers/platform/chrome/cros_typec_vdm.c
index fc7b602ceb37ff8356760e23b9946d132cced5f8..aca9d337118ef77dafb10d06ec408ad827b348fe 100644 (file)
--- a/drivers/platform/chrome/cros_typec_vdm.c
+++ b/drivers/platform/chrome/cros_typec_vdm.c
@@ -77,6 +77,30 @@ static int cros_typec_port_amode_enter(struct typec_altmode *amode, u32 *vdo)
                           sizeof(req), NULL, 0);
 }
 
+static int cros_typec_port_amode_vdm(struct typec_altmode *amode, const u32 hdr,
+                                    const u32 *vdo, int cnt)
+{
+       struct cros_typec_port *port = typec_altmode_get_drvdata(amode);
+       struct ec_params_typec_control req = {
+               .port = port->port_num,
+               .command = TYPEC_CONTROL_COMMAND_SEND_VDM_REQ,
+       };
+       struct typec_vdm_req vdm_req = {};
+
+       vdm_req.vdm_data[0] = hdr;
+       vdm_req.vdm_data_objects = cnt;
+       memcpy(&vdm_req.vdm_data[1], vdo, cnt - 1);
+       vdm_req.partner_type = TYPEC_PARTNER_SOP;
+       req.vdm_req_params = vdm_req;
+
+       dev_dbg(port->typec_data->dev, "Sending VDM, hdr: %x, num_objects: %d, port: %d\n",
+               hdr, cnt, port->port_num);
+
+       return cros_ec_cmd(port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL, &req,
+                          sizeof(req), NULL, 0);
+}
+
 struct typec_altmode_ops port_amode_ops = {
        .enter = cros_typec_port_amode_enter,
+       .vdm = cros_typec_port_amode_vdm,
 };