diff options
Diffstat (limited to 'drivers/platform/chrome/cros_typec_vdm.c')
| -rw-r--r-- | drivers/platform/chrome/cros_typec_vdm.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_typec_vdm.c b/drivers/platform/chrome/cros_typec_vdm.c new file mode 100644 index 000000000000..20515ee0a20e --- /dev/null +++ b/drivers/platform/chrome/cros_typec_vdm.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * USB Power Delivery Vendor Defined Message (VDM) support code. + * + * Copyright 2023 Google LLC + * Author: Prashant Malani <pmalani@chromium.org> + */ + +#include <linux/module.h> +#include <linux/platform_data/cros_ec_commands.h> +#include <linux/usb/pd_vdo.h> + +#include "cros_ec_typec.h" +#include "cros_typec_vdm.h" + +/* + * Retrieves pending VDM attention messages from the EC and forwards them to the altmode driver + * based on SVID. + */ +void cros_typec_handle_vdm_attention(struct cros_typec_data *typec, int port_num) +{ + struct ec_response_typec_vdm_response resp; + struct ec_params_typec_vdm_response req = { + .port = port_num, + }; + struct typec_altmode *amode; + u16 svid; + u32 hdr; + int ret; + + do { + ret = cros_ec_cmd(typec->ec, 0, EC_CMD_TYPEC_VDM_RESPONSE, &req, + sizeof(req), &resp, sizeof(resp)); + if (ret < 0) { + dev_warn(typec->dev, "Failed VDM response fetch, port: %d\n", port_num); + return; + } + + hdr = resp.vdm_response[0]; + svid = PD_VDO_VID(hdr); + dev_dbg(typec->dev, "Received VDM Attention header: %x, port: %d\n", hdr, port_num); + + amode = typec_match_altmode(typec->ports[port_num]->port_altmode, + CROS_EC_ALTMODE_MAX, svid, PD_VDO_OPOS(hdr)); + if (!amode) { + dev_err(typec->dev, + "Received VDM for unregistered altmode (SVID:%x), port: %d\n", + svid, port_num); + return; + } + + typec_altmode_attention(amode, resp.vdm_attention[1]); + } while (resp.vdm_attention_left); +} + +/* + * Retrieves a VDM response from the EC and forwards it to the altmode driver based on SVID. + */ +void cros_typec_handle_vdm_response(struct cros_typec_data *typec, int port_num) +{ + struct ec_response_typec_vdm_response resp; + struct ec_params_typec_vdm_response req = { + .port = port_num, + }; + struct typec_altmode *amode; + u16 svid; + u32 hdr; + int ret; + + ret = cros_ec_cmd(typec->ec, 0, EC_CMD_TYPEC_VDM_RESPONSE, &req, + sizeof(req), &resp, sizeof(resp)); + if (ret < 0) { + dev_warn(typec->dev, "Failed VDM response fetch, port: %d\n", port_num); + return; + } + + hdr = resp.vdm_response[0]; + svid = PD_VDO_VID(hdr); + dev_dbg(typec->dev, "Received VDM header: %x, port: %d\n", hdr, port_num); + + amode = typec_match_altmode(typec->ports[port_num]->port_altmode, CROS_EC_ALTMODE_MAX, + svid, PD_VDO_OPOS(hdr)); + if (!amode) { + dev_err(typec->dev, "Received VDM for unregistered altmode (SVID:%x), port: %d\n", + svid, port_num); + return; + } + + ret = typec_altmode_vdm(amode, hdr, &resp.vdm_response[1], resp.vdm_data_objects); + if (ret) + dev_err(typec->dev, "Failed to forward VDM to altmode (SVID:%x), port: %d\n", + svid, port_num); +} + +static int cros_typec_port_amode_enter(struct typec_altmode *amode, u32 *vdo) +{ + 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 = {}; + u32 hdr; + + hdr = VDO(amode->svid, 1, SVDM_VER_2_0, CMD_ENTER_MODE); + hdr |= VDO_OPOS(amode->mode); + + vdm_req.vdm_data[0] = hdr; + vdm_req.vdm_data_objects = 1; + vdm_req.partner_type = TYPEC_PARTNER_SOP; + req.vdm_req_params = vdm_req; + + dev_dbg(port->typec_data->dev, "Sending EnterMode VDM, hdr: %x, port: %d\n", + hdr, port->port_num); + + return cros_ec_cmd(port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL, &req, + 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 = {}; + int i; + + vdm_req.vdm_data[0] = hdr; + vdm_req.vdm_data_objects = cnt; + for (i = 1; i < cnt; i++) + vdm_req.vdm_data[i] = vdo[i-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, +}; |