Commit c6983166 authored by Benson Leung's avatar Benson Leung Committed by Chanwoo Choi

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: default avatarBenson Leung <bleung@chromium.org>
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: default avatarChanwoo Choi <cw00.chio@samsung.com>
Acked-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent 5771a8c0
...@@ -150,4 +150,11 @@ config EXTCON_USB_GPIO ...@@ -150,4 +150,11 @@ config EXTCON_USB_GPIO
Say Y here to enable GPIO based USB cable detection extcon support. Say Y here to enable GPIO based USB cable detection extcon support.
Used typically if GPIO is used for USB ID pin detection. Used typically if GPIO is used for USB ID pin detection.
config EXTCON_USBC_CROS_EC
tristate "ChromeOS Embedded Controller EXTCON support"
depends on MFD_CROS_EC
help
Say Y here to enable USB Type C cable detection extcon support when
using Chrome OS EC based USB Type-C ports.
endif endif
...@@ -20,3 +20,4 @@ obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o ...@@ -20,3 +20,4 @@ obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o
obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o
obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o
obj-$(CONFIG_EXTCON_USBC_CROS_EC) += extcon-usbc-cros-ec.o
/**
* drivers/extcon/extcon-usbc-cros-ec - ChromeOS Embedded Controller extcon
*
* Copyright (C) 2017 Google, Inc
* Author: Benson Leung <bleung@chromium.org>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/extcon.h>
#include <linux/kernel.h>
#include <linux/mfd/cros_ec.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sched.h>
struct cros_ec_extcon_info {
struct device *dev;
struct extcon_dev *edev;
int port_id;
struct cros_ec_device *ec;
struct notifier_block notifier;
bool dp; /* DisplayPort enabled */
bool mux; /* SuperSpeed (usb3) enabled */
unsigned int power_type;
};
static const unsigned int usb_type_c_cable[] = {
EXTCON_DISP_DP,
EXTCON_NONE,
};
/**
* cros_ec_pd_command() - Send a command to the EC.
* @info: pointer to struct cros_ec_extcon_info
* @command: EC command
* @version: EC command version
* @outdata: EC command output data
* @outsize: Size of outdata
* @indata: EC command input data
* @insize: Size of indata
*
* Return: 0 on success, <0 on failure.
*/
static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
unsigned int command,
unsigned int version,
void *outdata,
unsigned int outsize,
void *indata,
unsigned int insize)
{
struct cros_ec_command *msg;
int ret;
msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
msg->version = version;
msg->command = command;
msg->outsize = outsize;
msg->insize = insize;
if (outsize)
memcpy(msg->data, outdata, outsize);
ret = cros_ec_cmd_xfer_status(info->ec, msg);
if (ret >= 0 && insize)
memcpy(indata, msg->data, insize);
kfree(msg);
return ret;
}
/**
* cros_ec_usb_get_power_type() - Get power type info about PD device attached
* to given port.
* @info: pointer to struct cros_ec_extcon_info
*
* Return: power type on success, <0 on failure.
*/
static int cros_ec_usb_get_power_type(struct cros_ec_extcon_info *info)
{
struct ec_params_usb_pd_power_info req;
struct ec_response_usb_pd_power_info resp;
int ret;
req.port = info->port_id;
ret = cros_ec_pd_command(info, EC_CMD_USB_PD_POWER_INFO, 0,
&req, sizeof(req), &resp, sizeof(resp));
if (ret < 0)
return ret;
return resp.type;
}
/**
* cros_ec_usb_get_pd_mux_state() - Get PD mux state for given port.
* @info: pointer to struct cros_ec_extcon_info
*
* Return: PD mux state on success, <0 on failure.
*/
static int cros_ec_usb_get_pd_mux_state(struct cros_ec_extcon_info *info)
{
struct ec_params_usb_pd_mux_info req;
struct ec_response_usb_pd_mux_info resp;
int ret;
req.port = info->port_id;
ret = cros_ec_pd_command(info, EC_CMD_USB_PD_MUX_INFO, 0,
&req, sizeof(req),
&resp, sizeof(resp));
if (ret < 0)
return ret;
return resp.flags;
}
/**
* cros_ec_usb_get_role() - Get role info about possible PD device attached to a
* given port.
* @info: pointer to struct cros_ec_extcon_info
* @polarity: pointer to cable polarity (return value)
*
* Return: role info on success, -ENOTCONN if no cable is connected, <0 on
* failure.
*/
static int cros_ec_usb_get_role(struct cros_ec_extcon_info *info,
bool *polarity)
{
struct ec_params_usb_pd_control pd_control;
struct ec_response_usb_pd_control_v1 resp;
int ret;
pd_control.port = info->port_id;
pd_control.role = USB_PD_CTRL_ROLE_NO_CHANGE;
pd_control.mux = USB_PD_CTRL_MUX_NO_CHANGE;
ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
&pd_control, sizeof(pd_control),
&resp, sizeof(resp));
if (ret < 0)
return ret;
if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
return -ENOTCONN;
*polarity = resp.polarity;
return resp.role;
}
/**
* cros_ec_pd_get_num_ports() - Get number of EC charge ports.
* @info: pointer to struct cros_ec_extcon_info
*
* Return: number of ports on success, <0 on failure.
*/
static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
{
struct ec_response_usb_pd_ports resp;
int ret;
ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
0, NULL, 0, &resp, sizeof(resp));
if (ret < 0)
return ret;
return resp.num_ports;
}
static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
bool force)
{
struct device *dev = info->dev;
int role, power_type;
bool polarity = false;
bool dp = false;
bool mux = false;
bool hpd = false;
power_type = cros_ec_usb_get_power_type(info);
if (power_type < 0) {
dev_err(dev, "failed getting power type err = %d\n",
power_type);
return power_type;
}
role = cros_ec_usb_get_role(info, &polarity);
if (role < 0) {
if (role != -ENOTCONN) {
dev_err(dev, "failed getting role err = %d\n", role);
return role;
}
} else {
int pd_mux_state;
pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
if (pd_mux_state < 0)
pd_mux_state = USB_PD_MUX_USB_ENABLED;
dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
}
if (force || info->dp != dp || info->mux != mux ||
info->power_type != power_type) {
info->dp = dp;
info->mux = mux;
info->power_type = power_type;
extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
extcon_set_property(info->edev, EXTCON_DISP_DP,
EXTCON_PROP_USB_TYPEC_POLARITY,
(union extcon_property_value)(int)polarity);
extcon_set_property(info->edev, EXTCON_DISP_DP,
EXTCON_PROP_USB_SS,
(union extcon_property_value)(int)mux);
extcon_set_property(info->edev, EXTCON_DISP_DP,
EXTCON_PROP_DISP_HPD,
(union extcon_property_value)(int)hpd);
extcon_sync(info->edev, EXTCON_DISP_DP);
} else if (hpd) {
extcon_set_property(info->edev, EXTCON_DISP_DP,
EXTCON_PROP_DISP_HPD,
(union extcon_property_value)(int)hpd);
extcon_sync(info->edev, EXTCON_DISP_DP);
}
return 0;
}
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_DISP_DP,
EXTCON_PROP_USB_TYPEC_POLARITY);
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);
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");
...@@ -285,6 +285,11 @@ enum host_event_code { ...@@ -285,6 +285,11 @@ enum host_event_code {
EC_HOST_EVENT_HANG_DETECT = 20, EC_HOST_EVENT_HANG_DETECT = 20,
/* Hang detect logic detected a hang and warm rebooted the AP */ /* Hang detect logic detected a hang and warm rebooted the AP */
EC_HOST_EVENT_HANG_REBOOT = 21, EC_HOST_EVENT_HANG_REBOOT = 21,
/* PD MCU triggering host event */
EC_HOST_EVENT_PD_MCU = 22,
/* EC desires to change state of host-controlled USB mux */
EC_HOST_EVENT_USB_MUX = 28,
/* /*
* The high bit of the event mask is not used as a host event code. If * The high bit of the event mask is not used as a host event code. If
...@@ -2905,6 +2910,76 @@ struct ec_params_usb_pd_control { ...@@ -2905,6 +2910,76 @@ struct ec_params_usb_pd_control {
uint8_t mux; uint8_t mux;
} __packed; } __packed;
#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 * Passthru commands
......
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