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
Родитель
5771a8c088
Коммит
c698316661
|
|
@ -150,4 +150,11 @@ config EXTCON_USB_GPIO
|
|||
Say Y here to enable GPIO based USB cable detection extcon support.
|
||||
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
|
||||
|
|
|
|||
|
|
@ -20,3 +20,4 @@ obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o
|
|||
obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
|
||||
obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o
|
||||
obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o
|
||||
obj-$(CONFIG_EXTCON_USBC_CROS_EC) += extcon-usbc-cros-ec.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,415 @@
|
|||
/**
|
||||
* 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 {
|
|||
EC_HOST_EVENT_HANG_DETECT = 20,
|
||||
/* Hang detect logic detected a hang and warm rebooted the AP */
|
||||
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
|
||||
|
|
@ -2905,6 +2910,76 @@ struct ec_params_usb_pd_control {
|
|||
uint8_t mux;
|
||||
} __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
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче