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extcon: cros-ec: Add extcon-cros-ec driver to support display out
This is the driver for the USB Type C cable detection mechanism built into the ChromeOS Embedded Controller on systems that have USB Type-C ports. At present, this allows for the presence of display out, but in future, it may also be used to notify host and device type cables and the presence of power. Signed-off-by: Benson Leung <bleung@chromium.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Acked-by: Chanwoo Choi <cw00.chio@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Benson Leung
Chanwoo Choi
parent
5771a8c088
commit
c698316661
4 changed files with 498 additions and 0 deletions
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@ -150,4 +150,11 @@ config EXTCON_USB_GPIO
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Say Y here to enable GPIO based USB cable detection extcon support.
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Used typically if GPIO is used for USB ID pin detection.
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config EXTCON_USBC_CROS_EC
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tristate "ChromeOS Embedded Controller EXTCON support"
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depends on MFD_CROS_EC
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help
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Say Y here to enable USB Type C cable detection extcon support when
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using Chrome OS EC based USB Type-C ports.
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endif
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@ -20,3 +20,4 @@ obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o
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obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
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obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o
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obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o
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obj-$(CONFIG_EXTCON_USBC_CROS_EC) += extcon-usbc-cros-ec.o
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415
drivers/extcon/extcon-usbc-cros-ec.c
Normal file
415
drivers/extcon/extcon-usbc-cros-ec.c
Normal file
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@ -0,0 +1,415 @@
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/**
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* drivers/extcon/extcon-usbc-cros-ec - 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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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/extcon.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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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_DISP_DP,
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EXTCON_NONE,
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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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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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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 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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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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} else {
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int pd_mux_state;
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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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}
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if (force || info->dp != dp || info->mux != mux ||
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info->power_type != power_type) {
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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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extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
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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_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_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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}
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static int extcon_cros_ec_event(struct notifier_block *nb,
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unsigned long queued_during_suspend,
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void *_notify)
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{
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struct cros_ec_extcon_info *info;
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struct cros_ec_device *ec;
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u32 host_event;
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info = container_of(nb, struct cros_ec_extcon_info, notifier);
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ec = info->ec;
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host_event = cros_ec_get_host_event(ec);
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if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) |
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EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
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extcon_cros_ec_detect_cable(info, false);
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return NOTIFY_OK;
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}
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return NOTIFY_DONE;
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}
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static int extcon_cros_ec_probe(struct platform_device *pdev)
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{
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struct cros_ec_extcon_info *info;
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struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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int numports, ret;
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = dev;
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info->ec = ec;
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if (np) {
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u32 port;
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ret = of_property_read_u32(np, "google,usb-port-id", &port);
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if (ret < 0) {
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dev_err(dev, "Missing google,usb-port-id property\n");
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return ret;
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}
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info->port_id = port;
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} else {
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info->port_id = pdev->id;
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}
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numports = cros_ec_pd_get_num_ports(info);
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if (numports < 0) {
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dev_err(dev, "failed getting number of ports! ret = %d\n",
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numports);
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return numports;
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}
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if (info->port_id >= numports) {
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dev_err(dev, "This system only supports %d ports\n", numports);
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return -ENODEV;
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}
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info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
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if (IS_ERR(info->edev)) {
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dev_err(dev, "failed to allocate extcon device\n");
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return -ENOMEM;
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}
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ret = devm_extcon_dev_register(dev, info->edev);
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if (ret < 0) {
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dev_err(dev, "failed to register extcon device\n");
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return ret;
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}
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extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_USB_TYPEC_POLARITY);
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extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_USB_SS);
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extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
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EXTCON_PROP_DISP_HPD);
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platform_set_drvdata(pdev, info);
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/* Get PD events from the EC */
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info->notifier.notifier_call = extcon_cros_ec_event;
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ret = blocking_notifier_chain_register(&info->ec->event_notifier,
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&info->notifier);
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if (ret < 0) {
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dev_err(dev, "failed to register notifier\n");
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return ret;
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}
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/* Perform initial detection */
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ret = extcon_cros_ec_detect_cable(info, true);
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if (ret < 0) {
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dev_err(dev, "failed to detect initial cable state\n");
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goto unregister_notifier;
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}
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return 0;
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unregister_notifier:
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blocking_notifier_chain_unregister(&info->ec->event_notifier,
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&info->notifier);
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return ret;
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}
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static int extcon_cros_ec_remove(struct platform_device *pdev)
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{
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struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
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blocking_notifier_chain_unregister(&info->ec->event_notifier,
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&info->notifier);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int extcon_cros_ec_suspend(struct device *dev)
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{
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return 0;
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}
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static int extcon_cros_ec_resume(struct device *dev)
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{
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int ret;
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struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
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ret = extcon_cros_ec_detect_cable(info, true);
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if (ret < 0)
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dev_err(dev, "failed to detect cable state on resume\n");
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return 0;
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}
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static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
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};
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#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
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#else
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#define DEV_PM_OPS NULL
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_OF
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static const struct of_device_id extcon_cros_ec_of_match[] = {
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{ .compatible = "google,extcon-usbc-cros-ec" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
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#endif /* CONFIG_OF */
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static struct platform_driver extcon_cros_ec_driver = {
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.driver = {
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.name = "extcon-usbc-cros-ec",
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.of_match_table = of_match_ptr(extcon_cros_ec_of_match),
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.pm = DEV_PM_OPS,
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},
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.remove = extcon_cros_ec_remove,
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.probe = extcon_cros_ec_probe,
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};
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module_platform_driver(extcon_cros_ec_driver);
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MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
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MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
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MODULE_LICENSE("GPL");
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@ -285,6 +285,11 @@ enum host_event_code {
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EC_HOST_EVENT_HANG_DETECT = 20,
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/* Hang detect logic detected a hang and warm rebooted the AP */
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EC_HOST_EVENT_HANG_REBOOT = 21,
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/* PD MCU triggering host event */
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EC_HOST_EVENT_PD_MCU = 22,
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/* EC desires to change state of host-controlled USB mux */
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EC_HOST_EVENT_USB_MUX = 28,
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/*
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* The high bit of the event mask is not used as a host event code. If
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@ -2905,6 +2910,76 @@ struct ec_params_usb_pd_control {
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uint8_t mux;
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} __packed;
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||||
#define PD_CTRL_RESP_ENABLED_COMMS (1 << 0) /* Communication enabled */
|
||||
#define PD_CTRL_RESP_ENABLED_CONNECTED (1 << 1) /* Device connected */
|
||||
#define PD_CTRL_RESP_ENABLED_PD_CAPABLE (1 << 2) /* Partner is PD capable */
|
||||
|
||||
struct ec_response_usb_pd_control_v1 {
|
||||
uint8_t enabled;
|
||||
uint8_t role;
|
||||
uint8_t polarity;
|
||||
char state[32];
|
||||
} __packed;
|
||||
|
||||
#define EC_CMD_USB_PD_PORTS 0x102
|
||||
|
||||
struct ec_response_usb_pd_ports {
|
||||
uint8_t num_ports;
|
||||
} __packed;
|
||||
|
||||
#define EC_CMD_USB_PD_POWER_INFO 0x103
|
||||
|
||||
#define PD_POWER_CHARGING_PORT 0xff
|
||||
struct ec_params_usb_pd_power_info {
|
||||
uint8_t port;
|
||||
} __packed;
|
||||
|
||||
enum usb_chg_type {
|
||||
USB_CHG_TYPE_NONE,
|
||||
USB_CHG_TYPE_PD,
|
||||
USB_CHG_TYPE_C,
|
||||
USB_CHG_TYPE_PROPRIETARY,
|
||||
USB_CHG_TYPE_BC12_DCP,
|
||||
USB_CHG_TYPE_BC12_CDP,
|
||||
USB_CHG_TYPE_BC12_SDP,
|
||||
USB_CHG_TYPE_OTHER,
|
||||
USB_CHG_TYPE_VBUS,
|
||||
USB_CHG_TYPE_UNKNOWN,
|
||||
};
|
||||
|
||||
struct usb_chg_measures {
|
||||
uint16_t voltage_max;
|
||||
uint16_t voltage_now;
|
||||
uint16_t current_max;
|
||||
uint16_t current_lim;
|
||||
} __packed;
|
||||
|
||||
struct ec_response_usb_pd_power_info {
|
||||
uint8_t role;
|
||||
uint8_t type;
|
||||
uint8_t dualrole;
|
||||
uint8_t reserved1;
|
||||
struct usb_chg_measures meas;
|
||||
uint32_t max_power;
|
||||
} __packed;
|
||||
|
||||
/* Get info about USB-C SS muxes */
|
||||
#define EC_CMD_USB_PD_MUX_INFO 0x11a
|
||||
|
||||
struct ec_params_usb_pd_mux_info {
|
||||
uint8_t port; /* USB-C port number */
|
||||
} __packed;
|
||||
|
||||
/* Flags representing mux state */
|
||||
#define USB_PD_MUX_USB_ENABLED (1 << 0)
|
||||
#define USB_PD_MUX_DP_ENABLED (1 << 1)
|
||||
#define USB_PD_MUX_POLARITY_INVERTED (1 << 2)
|
||||
#define USB_PD_MUX_HPD_IRQ (1 << 3)
|
||||
|
||||
struct ec_response_usb_pd_mux_info {
|
||||
uint8_t flags; /* USB_PD_MUX_*-encoded USB mux state */
|
||||
} __packed;
|
||||
|
||||
/*****************************************************************************/
|
||||
/*
|
||||
* Passthru commands
|
||||
|
|
|
|||
Loading…
Reference in a new issue