542 lines
14 KiB
C
542 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// ChromeOS Embedded Controller extcon
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//
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// Copyright (C) 2017 Google, Inc.
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// Author: Benson Leung <bleung@chromium.org>
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#include <linux/extcon-provider.h>
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#include <linux/kernel.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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struct cros_ec_extcon_info {
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struct device *dev;
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struct extcon_dev *edev;
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int port_id;
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struct cros_ec_device *ec;
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struct notifier_block notifier;
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unsigned int dr; /* data role */
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bool pr; /* power role (true if VBUS enabled) */
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bool dp; /* DisplayPort enabled */
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bool mux; /* SuperSpeed (usb3) enabled */
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unsigned int power_type;
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};
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static const unsigned int usb_type_c_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_DISP_DP,
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EXTCON_NONE,
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};
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enum usb_data_roles {
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DR_NONE,
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DR_HOST,
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DR_DEVICE,
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};
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/**
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* cros_ec_pd_command() - Send a command to the EC.
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* @info: pointer to struct cros_ec_extcon_info
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* @command: EC command
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* @version: EC command version
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* @outdata: EC command output data
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* @outsize: Size of outdata
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* @indata: EC command input data
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* @insize: Size of indata
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*
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* Return: 0 on success, <0 on failure.
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*/
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static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
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unsigned int command,
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unsigned int version,
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void *outdata,
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unsigned int outsize,
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void *indata,
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unsigned int insize)
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{
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struct cros_ec_command *msg;
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int ret;
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msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->version = version;
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msg->command = command;
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msg->outsize = outsize;
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msg->insize = insize;
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if (outsize)
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memcpy(msg->data, outdata, outsize);
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ret = cros_ec_cmd_xfer_status(info->ec, msg);
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if (ret >= 0 && insize)
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memcpy(indata, msg->data, insize);
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kfree(msg);
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return ret;
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}
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/**
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* cros_ec_usb_get_power_type() - Get power type info about PD device attached
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* to given port.
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* @info: pointer to struct cros_ec_extcon_info
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*
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* Return: power type on success, <0 on failure.
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*/
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static int cros_ec_usb_get_power_type(struct cros_ec_extcon_info *info)
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{
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struct ec_params_usb_pd_power_info req;
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struct ec_response_usb_pd_power_info resp;
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int ret;
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req.port = info->port_id;
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ret = cros_ec_pd_command(info, EC_CMD_USB_PD_POWER_INFO, 0,
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&req, sizeof(req), &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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return resp.type;
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}
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/**
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* cros_ec_usb_get_pd_mux_state() - Get PD mux state for given port.
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* @info: pointer to struct cros_ec_extcon_info
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*
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* Return: PD mux state on success, <0 on failure.
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*/
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static int cros_ec_usb_get_pd_mux_state(struct cros_ec_extcon_info *info)
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{
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struct ec_params_usb_pd_mux_info req;
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struct ec_response_usb_pd_mux_info resp;
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int ret;
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req.port = info->port_id;
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ret = cros_ec_pd_command(info, EC_CMD_USB_PD_MUX_INFO, 0,
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&req, sizeof(req),
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&resp, sizeof(resp));
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if (ret < 0)
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return ret;
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return resp.flags;
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}
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/**
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* cros_ec_usb_get_role() - Get role info about possible PD device attached to a
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* given port.
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* @info: pointer to struct cros_ec_extcon_info
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* @polarity: pointer to cable polarity (return value)
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*
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* Return: role info on success, -ENOTCONN if no cable is connected, <0 on
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* failure.
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*/
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static int cros_ec_usb_get_role(struct cros_ec_extcon_info *info,
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bool *polarity)
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{
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struct ec_params_usb_pd_control pd_control;
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struct ec_response_usb_pd_control_v1 resp;
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int ret;
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pd_control.port = info->port_id;
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pd_control.role = USB_PD_CTRL_ROLE_NO_CHANGE;
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pd_control.mux = USB_PD_CTRL_MUX_NO_CHANGE;
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pd_control.swap = USB_PD_CTRL_SWAP_NONE;
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ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
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&pd_control, sizeof(pd_control),
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&resp, sizeof(resp));
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if (ret < 0)
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return ret;
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if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
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return -ENOTCONN;
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*polarity = resp.polarity;
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return resp.role;
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}
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/**
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* cros_ec_pd_get_num_ports() - Get number of EC charge ports.
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* @info: pointer to struct cros_ec_extcon_info
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*
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* Return: number of ports on success, <0 on failure.
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*/
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static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
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{
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struct ec_response_usb_pd_ports resp;
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int ret;
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ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
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0, NULL, 0, &resp, sizeof(resp));
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if (ret < 0)
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return ret;
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return resp.num_ports;
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}
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static const char *cros_ec_usb_role_string(unsigned int role)
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{
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return role == DR_NONE ? "DISCONNECTED" :
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(role == DR_HOST ? "DFP" : "UFP");
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}
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static const char *cros_ec_usb_power_type_string(unsigned int type)
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{
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switch (type) {
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case USB_CHG_TYPE_NONE:
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return "USB_CHG_TYPE_NONE";
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case USB_CHG_TYPE_PD:
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return "USB_CHG_TYPE_PD";
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case USB_CHG_TYPE_PROPRIETARY:
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return "USB_CHG_TYPE_PROPRIETARY";
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case USB_CHG_TYPE_C:
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return "USB_CHG_TYPE_C";
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case USB_CHG_TYPE_BC12_DCP:
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return "USB_CHG_TYPE_BC12_DCP";
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case USB_CHG_TYPE_BC12_CDP:
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return "USB_CHG_TYPE_BC12_CDP";
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case USB_CHG_TYPE_BC12_SDP:
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return "USB_CHG_TYPE_BC12_SDP";
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case USB_CHG_TYPE_OTHER:
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return "USB_CHG_TYPE_OTHER";
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case USB_CHG_TYPE_VBUS:
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return "USB_CHG_TYPE_VBUS";
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case USB_CHG_TYPE_UNKNOWN:
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return "USB_CHG_TYPE_UNKNOWN";
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default:
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return "USB_CHG_TYPE_UNKNOWN";
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}
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}
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static bool cros_ec_usb_power_type_is_wall_wart(unsigned int type,
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unsigned int role)
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{
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switch (type) {
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/* FIXME : Guppy, Donnettes, and other chargers will be miscategorized
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* because they identify with USB_CHG_TYPE_C, but we can't return true
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* here from that code because that breaks Suzy-Q and other kinds of
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* USB Type-C cables and peripherals.
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*/
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case USB_CHG_TYPE_PROPRIETARY:
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case USB_CHG_TYPE_BC12_DCP:
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return true;
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case USB_CHG_TYPE_PD:
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case USB_CHG_TYPE_C:
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case USB_CHG_TYPE_BC12_CDP:
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case USB_CHG_TYPE_BC12_SDP:
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case USB_CHG_TYPE_OTHER:
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case USB_CHG_TYPE_VBUS:
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case USB_CHG_TYPE_UNKNOWN:
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case USB_CHG_TYPE_NONE:
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default:
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return false;
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}
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}
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static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
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bool force)
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{
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struct device *dev = info->dev;
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int role, power_type;
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unsigned int dr = DR_NONE;
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bool pr = false;
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bool polarity = false;
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bool dp = false;
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bool mux = false;
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bool hpd = false;
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power_type = cros_ec_usb_get_power_type(info);
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if (power_type < 0) {
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dev_err(dev, "failed getting power type err = %d\n",
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power_type);
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return power_type;
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}
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role = cros_ec_usb_get_role(info, &polarity);
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if (role < 0) {
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if (role != -ENOTCONN) {
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dev_err(dev, "failed getting role err = %d\n", role);
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return role;
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}
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dev_dbg(dev, "disconnected\n");
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} else {
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int pd_mux_state;
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dr = (role & PD_CTRL_RESP_ROLE_DATA) ? DR_HOST : DR_DEVICE;
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pr = (role & PD_CTRL_RESP_ROLE_POWER);
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pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
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if (pd_mux_state < 0)
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pd_mux_state = USB_PD_MUX_USB_ENABLED;
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dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
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mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
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hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
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dev_dbg(dev,
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"connected role 0x%x pwr type %d dr %d pr %d pol %d mux %d dp %d hpd %d\n",
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role, power_type, dr, pr, polarity, mux, dp, hpd);
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}
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/*
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* When there is no USB host (e.g. USB PD charger),
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* we are not really a UFP for the AP.
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*/
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if (dr == DR_DEVICE &&
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cros_ec_usb_power_type_is_wall_wart(power_type, role))
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dr = DR_NONE;
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if (force || info->dr != dr || info->pr != pr || info->dp != dp ||
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info->mux != mux || info->power_type != power_type) {
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bool host_connected = false, device_connected = false;
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dev_dbg(dev, "Type/Role switch! type = %s role = %s\n",
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cros_ec_usb_power_type_string(power_type),
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cros_ec_usb_role_string(dr));
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info->dr = dr;
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info->pr = pr;
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info->dp = dp;
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info->mux = mux;
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info->power_type = power_type;
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if (dr == DR_DEVICE)
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device_connected = true;
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else if (dr == DR_HOST)
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host_connected = true;
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extcon_set_state(info->edev, EXTCON_USB, device_connected);
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extcon_set_state(info->edev, EXTCON_USB_HOST, host_connected);
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extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
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extcon_set_property(info->edev, EXTCON_USB,
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EXTCON_PROP_USB_VBUS,
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(union extcon_property_value)(int)pr);
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extcon_set_property(info->edev, EXTCON_USB_HOST,
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EXTCON_PROP_USB_VBUS,
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(union extcon_property_value)(int)pr);
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extcon_set_property(info->edev, EXTCON_USB,
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EXTCON_PROP_USB_TYPEC_POLARITY,
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(union extcon_property_value)(int)polarity);
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extcon_set_property(info->edev, EXTCON_USB_HOST,
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EXTCON_PROP_USB_TYPEC_POLARITY,
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(union extcon_property_value)(int)polarity);
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extcon_set_property(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_USB_TYPEC_POLARITY,
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(union extcon_property_value)(int)polarity);
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extcon_set_property(info->edev, EXTCON_USB,
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EXTCON_PROP_USB_SS,
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(union extcon_property_value)(int)mux);
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extcon_set_property(info->edev, EXTCON_USB_HOST,
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EXTCON_PROP_USB_SS,
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(union extcon_property_value)(int)mux);
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extcon_set_property(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_USB_SS,
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(union extcon_property_value)(int)mux);
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extcon_set_property(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_DISP_HPD,
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(union extcon_property_value)(int)hpd);
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extcon_sync(info->edev, EXTCON_USB);
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extcon_sync(info->edev, EXTCON_USB_HOST);
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extcon_sync(info->edev, EXTCON_DISP_DP);
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} else if (hpd) {
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extcon_set_property(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_DISP_HPD,
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(union extcon_property_value)(int)hpd);
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extcon_sync(info->edev, EXTCON_DISP_DP);
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}
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return 0;
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||
|
|
}
|
||
|
|
|
||
|
|
static int extcon_cros_ec_event(struct notifier_block *nb,
|
||
|
|
unsigned long queued_during_suspend,
|
||
|
|
void *_notify)
|
||
|
|
{
|
||
|
|
struct cros_ec_extcon_info *info;
|
||
|
|
struct cros_ec_device *ec;
|
||
|
|
u32 host_event;
|
||
|
|
|
||
|
|
info = container_of(nb, struct cros_ec_extcon_info, notifier);
|
||
|
|
ec = info->ec;
|
||
|
|
|
||
|
|
host_event = cros_ec_get_host_event(ec);
|
||
|
|
if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) |
|
||
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
|
||
|
|
extcon_cros_ec_detect_cable(info, false);
|
||
|
|
return NOTIFY_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
return NOTIFY_DONE;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int extcon_cros_ec_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct cros_ec_extcon_info *info;
|
||
|
|
struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct device_node *np = dev->of_node;
|
||
|
|
int numports, ret;
|
||
|
|
|
||
|
|
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
|
||
|
|
if (!info)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
info->dev = dev;
|
||
|
|
info->ec = ec;
|
||
|
|
|
||
|
|
if (np) {
|
||
|
|
u32 port;
|
||
|
|
|
||
|
|
ret = of_property_read_u32(np, "google,usb-port-id", &port);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dev, "Missing google,usb-port-id property\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
info->port_id = port;
|
||
|
|
} else {
|
||
|
|
info->port_id = pdev->id;
|
||
|
|
}
|
||
|
|
|
||
|
|
numports = cros_ec_pd_get_num_ports(info);
|
||
|
|
if (numports < 0) {
|
||
|
|
dev_err(dev, "failed getting number of ports! ret = %d\n",
|
||
|
|
numports);
|
||
|
|
return numports;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (info->port_id >= numports) {
|
||
|
|
dev_err(dev, "This system only supports %d ports\n", numports);
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
|
||
|
|
if (IS_ERR(info->edev)) {
|
||
|
|
dev_err(dev, "failed to allocate extcon device\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = devm_extcon_dev_register(dev, info->edev);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dev, "failed to register extcon device\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_USB,
|
||
|
|
EXTCON_PROP_USB_VBUS);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
|
||
|
|
EXTCON_PROP_USB_VBUS);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_USB,
|
||
|
|
EXTCON_PROP_USB_TYPEC_POLARITY);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
|
||
|
|
EXTCON_PROP_USB_TYPEC_POLARITY);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
|
||
|
|
EXTCON_PROP_USB_TYPEC_POLARITY);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_USB,
|
||
|
|
EXTCON_PROP_USB_SS);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
|
||
|
|
EXTCON_PROP_USB_SS);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
|
||
|
|
EXTCON_PROP_USB_SS);
|
||
|
|
extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
|
||
|
|
EXTCON_PROP_DISP_HPD);
|
||
|
|
|
||
|
|
info->dr = DR_NONE;
|
||
|
|
info->pr = false;
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, info);
|
||
|
|
|
||
|
|
/* Get PD events from the EC */
|
||
|
|
info->notifier.notifier_call = extcon_cros_ec_event;
|
||
|
|
ret = blocking_notifier_chain_register(&info->ec->event_notifier,
|
||
|
|
&info->notifier);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dev, "failed to register notifier\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Perform initial detection */
|
||
|
|
ret = extcon_cros_ec_detect_cable(info, true);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dev, "failed to detect initial cable state\n");
|
||
|
|
goto unregister_notifier;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
unregister_notifier:
|
||
|
|
blocking_notifier_chain_unregister(&info->ec->event_notifier,
|
||
|
|
&info->notifier);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int extcon_cros_ec_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
blocking_notifier_chain_unregister(&info->ec->event_notifier,
|
||
|
|
&info->notifier);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
static int extcon_cros_ec_suspend(struct device *dev)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int extcon_cros_ec_resume(struct device *dev)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
ret = extcon_cros_ec_detect_cable(info, true);
|
||
|
|
if (ret < 0)
|
||
|
|
dev_err(dev, "failed to detect cable state on resume\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
|
||
|
|
SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
|
||
|
|
};
|
||
|
|
|
||
|
|
#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
|
||
|
|
#else
|
||
|
|
#define DEV_PM_OPS NULL
|
||
|
|
#endif /* CONFIG_PM_SLEEP */
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
static const struct of_device_id extcon_cros_ec_of_match[] = {
|
||
|
|
{ .compatible = "google,extcon-usbc-cros-ec" },
|
||
|
|
{ /* sentinel */ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
|
||
|
|
#endif /* CONFIG_OF */
|
||
|
|
|
||
|
|
static struct platform_driver extcon_cros_ec_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "extcon-usbc-cros-ec",
|
||
|
|
.of_match_table = of_match_ptr(extcon_cros_ec_of_match),
|
||
|
|
.pm = DEV_PM_OPS,
|
||
|
|
},
|
||
|
|
.remove = extcon_cros_ec_remove,
|
||
|
|
.probe = extcon_cros_ec_probe,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(extcon_cros_ec_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
|
||
|
|
MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
|
||
|
|
MODULE_LICENSE("GPL v2");
|