[mirror_ubuntu-jammy-kernel.git] / drivers / extcon / extcon-usbc-cros-ec.c

/**
 * 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-provider.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;

	unsigned int dr; /* data role */
	bool pr; /* power role (true if VBUS enabled) */
	bool dp; /* DisplayPort enabled */
	bool mux; /* SuperSpeed (usb3) enabled */
	unsigned int power_type;
};

static const unsigned int usb_type_c_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_DISP_DP,
	EXTCON_NONE,
};

enum usb_data_roles {
	DR_NONE,
	DR_HOST,
	DR_DEVICE,
};

/**
 * 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);
	if (!msg)
		return -ENOMEM;

	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;
	pd_control.swap = USB_PD_CTRL_SWAP_NONE;
	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 const char *cros_ec_usb_role_string(unsigned int role)
{
	return role == DR_NONE ? "DISCONNECTED" :
		(role == DR_HOST ? "DFP" : "UFP");
}

static const char *cros_ec_usb_power_type_string(unsigned int type)
{
	switch (type) {
	case USB_CHG_TYPE_NONE:
		return "USB_CHG_TYPE_NONE";
	case USB_CHG_TYPE_PD:
		return "USB_CHG_TYPE_PD";
	case USB_CHG_TYPE_PROPRIETARY:
		return "USB_CHG_TYPE_PROPRIETARY";
	case USB_CHG_TYPE_C:
		return "USB_CHG_TYPE_C";
	case USB_CHG_TYPE_BC12_DCP:
		return "USB_CHG_TYPE_BC12_DCP";
	case USB_CHG_TYPE_BC12_CDP:
		return "USB_CHG_TYPE_BC12_CDP";
	case USB_CHG_TYPE_BC12_SDP:
		return "USB_CHG_TYPE_BC12_SDP";
	case USB_CHG_TYPE_OTHER:
		return "USB_CHG_TYPE_OTHER";
	case USB_CHG_TYPE_VBUS:
		return "USB_CHG_TYPE_VBUS";
	case USB_CHG_TYPE_UNKNOWN:
		return "USB_CHG_TYPE_UNKNOWN";
	default:
		return "USB_CHG_TYPE_UNKNOWN";
	}
}

static bool cros_ec_usb_power_type_is_wall_wart(unsigned int type,
						unsigned int role)
{
	switch (type) {
	/* FIXME : Guppy, Donnettes, and other chargers will be miscategorized
	 * because they identify with USB_CHG_TYPE_C, but we can't return true
	 * here from that code because that breaks Suzy-Q and other kinds of
	 * USB Type-C cables and peripherals.
	 */
	case USB_CHG_TYPE_PROPRIETARY:
	case USB_CHG_TYPE_BC12_DCP:
		return true;
	case USB_CHG_TYPE_PD:
	case USB_CHG_TYPE_C:
	case USB_CHG_TYPE_BC12_CDP:
	case USB_CHG_TYPE_BC12_SDP:
	case USB_CHG_TYPE_OTHER:
	case USB_CHG_TYPE_VBUS:
	case USB_CHG_TYPE_UNKNOWN:
	case USB_CHG_TYPE_NONE:
	default:
		return false;
	}
}

static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
				       bool force)
{
	struct device *dev = info->dev;
	int role, power_type;
	unsigned int dr = DR_NONE;
	bool pr = false;
	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;
		}
		dev_dbg(dev, "disconnected\n");
	} else {
		int pd_mux_state;

		dr = (role & PD_CTRL_RESP_ROLE_DATA) ? DR_HOST : DR_DEVICE;
		pr = (role & PD_CTRL_RESP_ROLE_POWER);
		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;

		dev_dbg(dev,
			"connected role 0x%x pwr type %d dr %d pr %d pol %d mux %d dp %d hpd %d\n",
			role, power_type, dr, pr, polarity, mux, dp, hpd);
	}

	/*
	 * When there is no USB host (e.g. USB PD charger),
	 * we are not really a UFP for the AP.
	 */
	if (dr == DR_DEVICE &&
	    cros_ec_usb_power_type_is_wall_wart(power_type, role))
		dr = DR_NONE;

	if (force || info->dr != dr || info->pr != pr || info->dp != dp ||
	    info->mux != mux || info->power_type != power_type) {
		bool host_connected = false, device_connected = false;

		dev_dbg(dev, "Type/Role switch! type = %s role = %s\n",
			cros_ec_usb_power_type_string(power_type),
			cros_ec_usb_role_string(dr));
		info->dr = dr;
		info->pr = pr;
		info->dp = dp;
		info->mux = mux;
		info->power_type = power_type;

		if (dr == DR_DEVICE)
			device_connected = true;
		else if (dr == DR_HOST)
			host_connected = true;

		extcon_set_state(info->edev, EXTCON_USB, device_connected);
		extcon_set_state(info->edev, EXTCON_USB_HOST, host_connected);
		extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
		extcon_set_property(info->edev, EXTCON_USB,
				    EXTCON_PROP_USB_VBUS,
				    (union extcon_property_value)(int)pr);
		extcon_set_property(info->edev, EXTCON_USB_HOST,
				    EXTCON_PROP_USB_VBUS,
				    (union extcon_property_value)(int)pr);
		extcon_set_property(info->edev, EXTCON_USB,
				    EXTCON_PROP_USB_TYPEC_POLARITY,
				    (union extcon_property_value)(int)polarity);
		extcon_set_property(info->edev, EXTCON_USB_HOST,
				    EXTCON_PROP_USB_TYPEC_POLARITY,
				    (union extcon_property_value)(int)polarity);
		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_USB,
				    EXTCON_PROP_USB_SS,
				    (union extcon_property_value)(int)mux);
		extcon_set_property(info->edev, EXTCON_USB_HOST,
				    EXTCON_PROP_USB_SS,
				    (union extcon_property_value)(int)mux);
		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_USB);
		extcon_sync(info->edev, EXTCON_USB_HOST);
		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_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");
Commit	Line	Data
c6983166 BL	1	/**
	2	* drivers/extcon/extcon-usbc-cros-ec - ChromeOS Embedded Controller extcon
	3	*
	4	* Copyright (C) 2017 Google, Inc
	5	* Author: Benson Leung <bleung@chromium.org>
	6	*
	7	* This software is licensed under the terms of the GNU General Public
	8	* License version 2, as published by the Free Software Foundation, and
	9	* may be copied, distributed, and modified under those terms.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
176aa360	17	#include <linux/extcon-provider.h>
c6983166 BL	18	#include <linux/kernel.h>
	19	#include <linux/mfd/cros_ec.h>
	20	#include <linux/module.h>
	21	#include <linux/notifier.h>
	22	#include <linux/of.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/slab.h>
	25	#include <linux/sched.h>
	26
	27	struct cros_ec_extcon_info {
	28	struct device *dev;
	29	struct extcon_dev *edev;
	30
	31	int port_id;
	32
	33	struct cros_ec_device *ec;
	34
	35	struct notifier_block notifier;
	36
c7eb47f9 BL	37	unsigned int dr; /* data role */
c7eb47f9 BL	38	bool pr; /* power role (true if VBUS enabled) */
c6983166 BL	39	bool dp; /* DisplayPort enabled */
	40	bool mux; /* SuperSpeed (usb3) enabled */
	41	unsigned int power_type;
	42	};
	43
	44	static const unsigned int usb_type_c_cable[] = {
c7eb47f9 BL	45	EXTCON_USB,
c7eb47f9 BL	46	EXTCON_USB_HOST,
c6983166 BL	47	EXTCON_DISP_DP,
	48	EXTCON_NONE,
	49	};
	50
c7eb47f9 BL	51	enum usb_data_roles {
	52	DR_NONE,
	53	DR_HOST,
	54	DR_DEVICE,
	55	};
	56
c6983166 BL	57	/**
	58	* cros_ec_pd_command() - Send a command to the EC.
	59	* @info: pointer to struct cros_ec_extcon_info
	60	* @command: EC command
	61	* @version: EC command version
	62	* @outdata: EC command output data
	63	* @outsize: Size of outdata
	64	* @indata: EC command input data
	65	* @insize: Size of indata
	66	*
	67	* Return: 0 on success, <0 on failure.
	68	*/
	69	static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
	70	unsigned int command,
	71	unsigned int version,
	72	void *outdata,
	73	unsigned int outsize,
	74	void *indata,
	75	unsigned int insize)
	76	{
	77	struct cros_ec_command *msg;
	78	int ret;
	79
	80	msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
1cf76c4e CJ	81	if (!msg)
1cf76c4e CJ	82	return -ENOMEM;
c6983166 BL	83
	84	msg->version = version;
	85	msg->command = command;
	86	msg->outsize = outsize;
	87	msg->insize = insize;
	88
	89	if (outsize)
	90	memcpy(msg->data, outdata, outsize);
	91
	92	ret = cros_ec_cmd_xfer_status(info->ec, msg);
	93	if (ret >= 0 && insize)
	94	memcpy(indata, msg->data, insize);
	95
	96	kfree(msg);
	97	return ret;
	98	}
	99
	100	/**
	101	* cros_ec_usb_get_power_type() - Get power type info about PD device attached
	102	* to given port.
	103	* @info: pointer to struct cros_ec_extcon_info
	104	*
	105	* Return: power type on success, <0 on failure.
	106	*/
	107	static int cros_ec_usb_get_power_type(struct cros_ec_extcon_info *info)
	108	{
	109	struct ec_params_usb_pd_power_info req;
	110	struct ec_response_usb_pd_power_info resp;
	111	int ret;
	112
	113	req.port = info->port_id;
	114	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_POWER_INFO, 0,
	115	&req, sizeof(req), &resp, sizeof(resp));
	116	if (ret < 0)
	117	return ret;
	118
	119	return resp.type;
	120	}
	121
	122	/**
	123	* cros_ec_usb_get_pd_mux_state() - Get PD mux state for given port.
	124	* @info: pointer to struct cros_ec_extcon_info
	125	*
	126	* Return: PD mux state on success, <0 on failure.
	127	*/
	128	static int cros_ec_usb_get_pd_mux_state(struct cros_ec_extcon_info *info)
	129	{
	130	struct ec_params_usb_pd_mux_info req;
	131	struct ec_response_usb_pd_mux_info resp;
	132	int ret;
	133
	134	req.port = info->port_id;
	135	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_MUX_INFO, 0,
	136	&req, sizeof(req),
	137	&resp, sizeof(resp));
	138	if (ret < 0)
	139	return ret;
	140
	141	return resp.flags;
	142	}
	143
	144	/**
	145	* cros_ec_usb_get_role() - Get role info about possible PD device attached to a
	146	* given port.
147	* @info: pointer to struct cros_ec_extcon_info
148	* @polarity: pointer to cable polarity (return value)
149	*
150	* Return: role info on success, -ENOTCONN if no cable is connected, <0 on
151	* failure.
152	*/
153	static int cros_ec_usb_get_role(struct cros_ec_extcon_info *info,
154	bool *polarity)
155	{
156	struct ec_params_usb_pd_control pd_control;
157	struct ec_response_usb_pd_control_v1 resp;
158	int ret;
159
160	pd_control.port = info->port_id;
161	pd_control.role = USB_PD_CTRL_ROLE_NO_CHANGE;
162	pd_control.mux = USB_PD_CTRL_MUX_NO_CHANGE;
c7eb47f9	163	pd_control.swap = USB_PD_CTRL_SWAP_NONE;
c6983166 BL	164	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
	165	&pd_control, sizeof(pd_control),
	166	&resp, sizeof(resp));
	167	if (ret < 0)
	168	return ret;
	169
	170	if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
	171	return -ENOTCONN;
	172
	173	*polarity = resp.polarity;
	174
	175	return resp.role;
	176	}
	177
	178	/**
	179	* cros_ec_pd_get_num_ports() - Get number of EC charge ports.
	180	* @info: pointer to struct cros_ec_extcon_info
	181	*
	182	* Return: number of ports on success, <0 on failure.
	183	*/
	184	static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
	185	{
	186	struct ec_response_usb_pd_ports resp;
	187	int ret;
	188
	189	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
	190	0, NULL, 0, &resp, sizeof(resp));
	191	if (ret < 0)
	192	return ret;
	193
	194	return resp.num_ports;
	195	}
	196
c7eb47f9 BL	197	static const char *cros_ec_usb_role_string(unsigned int role)
	198	{
	199	return role == DR_NONE ? "DISCONNECTED" :
	200	(role == DR_HOST ? "DFP" : "UFP");
	201	}
	202
	203	static const char *cros_ec_usb_power_type_string(unsigned int type)
	204	{
	205	switch (type) {
	206	case USB_CHG_TYPE_NONE:
	207	return "USB_CHG_TYPE_NONE";
	208	case USB_CHG_TYPE_PD:
	209	return "USB_CHG_TYPE_PD";
	210	case USB_CHG_TYPE_PROPRIETARY:
	211	return "USB_CHG_TYPE_PROPRIETARY";
	212	case USB_CHG_TYPE_C:
	213	return "USB_CHG_TYPE_C";
	214	case USB_CHG_TYPE_BC12_DCP:
	215	return "USB_CHG_TYPE_BC12_DCP";
	216	case USB_CHG_TYPE_BC12_CDP:
	217	return "USB_CHG_TYPE_BC12_CDP";
	218	case USB_CHG_TYPE_BC12_SDP:
	219	return "USB_CHG_TYPE_BC12_SDP";
	220	case USB_CHG_TYPE_OTHER:
	221	return "USB_CHG_TYPE_OTHER";
	222	case USB_CHG_TYPE_VBUS:
	223	return "USB_CHG_TYPE_VBUS";
	224	case USB_CHG_TYPE_UNKNOWN:
	225	return "USB_CHG_TYPE_UNKNOWN";
	226	default:
	227	return "USB_CHG_TYPE_UNKNOWN";
	228	}
	229	}
	230
	231	static bool cros_ec_usb_power_type_is_wall_wart(unsigned int type,
	232	unsigned int role)
	233	{
	234	switch (type) {
	235	/* FIXME : Guppy, Donnettes, and other chargers will be miscategorized
	236	* because they identify with USB_CHG_TYPE_C, but we can't return true
	237	* here from that code because that breaks Suzy-Q and other kinds of
	238	* USB Type-C cables and peripherals.
	239	*/
	240	case USB_CHG_TYPE_PROPRIETARY:
	241	case USB_CHG_TYPE_BC12_DCP:
	242	return true;
	243	case USB_CHG_TYPE_PD:
	244	case USB_CHG_TYPE_C:
	245	case USB_CHG_TYPE_BC12_CDP:
	246	case USB_CHG_TYPE_BC12_SDP:
	247	case USB_CHG_TYPE_OTHER:
	248	case USB_CHG_TYPE_VBUS:
	249	case USB_CHG_TYPE_UNKNOWN:
	250	case USB_CHG_TYPE_NONE:
	251	default:
	252	return false;
	253	}
	254	}
	255
c6983166 BL	256	static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
	257	bool force)
	258	{
	259	struct device *dev = info->dev;
	260	int role, power_type;
c7eb47f9 BL	261	unsigned int dr = DR_NONE;
c7eb47f9 BL	262	bool pr = false;
c6983166 BL	263	bool polarity = false;
	264	bool dp = false;
	265	bool mux = false;
	266	bool hpd = false;
	267
	268	power_type = cros_ec_usb_get_power_type(info);
	269	if (power_type < 0) {
	270	dev_err(dev, "failed getting power type err = %d\n",
	271	power_type);
	272	return power_type;
	273	}
	274
	275	role = cros_ec_usb_get_role(info, &polarity);
	276	if (role < 0) {
	277	if (role != -ENOTCONN) {
	278	dev_err(dev, "failed getting role err = %d\n", role);
	279	return role;
	280	}
c7eb47f9	281	dev_dbg(dev, "disconnected\n");
c6983166 BL	282	} else {
	283	int pd_mux_state;
	284
c7eb47f9 BL	285	dr = (role & PD_CTRL_RESP_ROLE_DATA) ? DR_HOST : DR_DEVICE;
c7eb47f9 BL	286	pr = (role & PD_CTRL_RESP_ROLE_POWER);
c6983166 BL	287	pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
	288	if (pd_mux_state < 0)
	289	pd_mux_state = USB_PD_MUX_USB_ENABLED;
	290
	291	dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
	292	mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
	293	hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
c6983166	294
c7eb47f9 BL	295	dev_dbg(dev,
	296	"connected role 0x%x pwr type %d dr %d pr %d pol %d mux %d dp %d hpd %d\n",
	297	role, power_type, dr, pr, polarity, mux, dp, hpd);
	298	}
c6983166	299
c7eb47f9 BL	300	/*
	301	* When there is no USB host (e.g. USB PD charger),
	302	* we are not really a UFP for the AP.
	303	*/
	304	if (dr == DR_DEVICE &&
	305	cros_ec_usb_power_type_is_wall_wart(power_type, role))
	306	dr = DR_NONE;
	307
	308	if (force \|\| info->dr != dr \|\| info->pr != pr \|\| info->dp != dp \|\|
	309	info->mux != mux \|\| info->power_type != power_type) {
	310	bool host_connected = false, device_connected = false;
	311
	312	dev_dbg(dev, "Type/Role switch! type = %s role = %s\n",
	313	cros_ec_usb_power_type_string(power_type),
	314	cros_ec_usb_role_string(dr));
	315	info->dr = dr;
	316	info->pr = pr;
c6983166 BL	317	info->dp = dp;
	318	info->mux = mux;
	319	info->power_type = power_type;
	320
c7eb47f9 BL	321	if (dr == DR_DEVICE)
	322	device_connected = true;
	323	else if (dr == DR_HOST)
	324	host_connected = true;
c6983166	325
c7eb47f9 BL	326	extcon_set_state(info->edev, EXTCON_USB, device_connected);
	327	extcon_set_state(info->edev, EXTCON_USB_HOST, host_connected);
	328	extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
	329	extcon_set_property(info->edev, EXTCON_USB,
	330	EXTCON_PROP_USB_VBUS,
	331	(union extcon_property_value)(int)pr);
	332	extcon_set_property(info->edev, EXTCON_USB_HOST,
	333	EXTCON_PROP_USB_VBUS,
	334	(union extcon_property_value)(int)pr);
	335	extcon_set_property(info->edev, EXTCON_USB,
	336	EXTCON_PROP_USB_TYPEC_POLARITY,
	337	(union extcon_property_value)(int)polarity);
	338	extcon_set_property(info->edev, EXTCON_USB_HOST,
	339	EXTCON_PROP_USB_TYPEC_POLARITY,
	340	(union extcon_property_value)(int)polarity);
c6983166 BL	341	extcon_set_property(info->edev, EXTCON_DISP_DP,
	342	EXTCON_PROP_USB_TYPEC_POLARITY,
	343	(union extcon_property_value)(int)polarity);
c7eb47f9 BL	344	extcon_set_property(info->edev, EXTCON_USB,
	345	EXTCON_PROP_USB_SS,
	346	(union extcon_property_value)(int)mux);
	347	extcon_set_property(info->edev, EXTCON_USB_HOST,
	348	EXTCON_PROP_USB_SS,
	349	(union extcon_property_value)(int)mux);
c6983166 BL	350	extcon_set_property(info->edev, EXTCON_DISP_DP,
	351	EXTCON_PROP_USB_SS,
	352	(union extcon_property_value)(int)mux);
	353	extcon_set_property(info->edev, EXTCON_DISP_DP,
	354	EXTCON_PROP_DISP_HPD,
	355	(union extcon_property_value)(int)hpd);
	356
c7eb47f9 BL	357	extcon_sync(info->edev, EXTCON_USB);
c7eb47f9 BL	358	extcon_sync(info->edev, EXTCON_USB_HOST);
c6983166 BL	359	extcon_sync(info->edev, EXTCON_DISP_DP);
	360
	361	} else if (hpd) {
	362	extcon_set_property(info->edev, EXTCON_DISP_DP,
	363	EXTCON_PROP_DISP_HPD,
	364	(union extcon_property_value)(int)hpd);
	365	extcon_sync(info->edev, EXTCON_DISP_DP);
	366	}
	367
	368	return 0;
	369	}
	370
	371	static int extcon_cros_ec_event(struct notifier_block *nb,
	372	unsigned long queued_during_suspend,
	373	void *_notify)
	374	{
	375	struct cros_ec_extcon_info *info;
	376	struct cros_ec_device *ec;
	377	u32 host_event;
	378
	379	info = container_of(nb, struct cros_ec_extcon_info, notifier);
	380	ec = info->ec;
	381
	382	host_event = cros_ec_get_host_event(ec);
	383	if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) \|
	384	EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
	385	extcon_cros_ec_detect_cable(info, false);
	386	return NOTIFY_OK;
	387	}
	388
	389	return NOTIFY_DONE;
	390	}
	391
	392	static int extcon_cros_ec_probe(struct platform_device *pdev)
	393	{
	394	struct cros_ec_extcon_info *info;
	395	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
	396	struct device *dev = &pdev->dev;
	397	struct device_node *np = dev->of_node;
	398	int numports, ret;
	399
	400	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	401	if (!info)
	402	return -ENOMEM;
	403
	404	info->dev = dev;
	405	info->ec = ec;
	406
	407	if (np) {
	408	u32 port;
	409
	410	ret = of_property_read_u32(np, "google,usb-port-id", &port);
	411	if (ret < 0) {
	412	dev_err(dev, "Missing google,usb-port-id property\n");
	413	return ret;
	414	}
	415	info->port_id = port;
	416	} else {
	417	info->port_id = pdev->id;
	418	}
	419
	420	numports = cros_ec_pd_get_num_ports(info);
	421	if (numports < 0) {
	422	dev_err(dev, "failed getting number of ports! ret = %d\n",
423	numports);
424	return numports;
425	}
426
427	if (info->port_id >= numports) {
428	dev_err(dev, "This system only supports %d ports\n", numports);
429	return -ENODEV;
430	}
431
432	info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
433	if (IS_ERR(info->edev)) {
434	dev_err(dev, "failed to allocate extcon device\n");
435	return -ENOMEM;
436	}
437
438	ret = devm_extcon_dev_register(dev, info->edev);
439	if (ret < 0) {
440	dev_err(dev, "failed to register extcon device\n");
441	return ret;
442	}
443
c7eb47f9 BL	444	extcon_set_property_capability(info->edev, EXTCON_USB,
	445	EXTCON_PROP_USB_VBUS);
	446	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
	447	EXTCON_PROP_USB_VBUS);
	448	extcon_set_property_capability(info->edev, EXTCON_USB,
	449	EXTCON_PROP_USB_TYPEC_POLARITY);
	450	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
	451	EXTCON_PROP_USB_TYPEC_POLARITY);
c6983166 BL	452	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
c6983166 BL	453	EXTCON_PROP_USB_TYPEC_POLARITY);
c7eb47f9 BL	454	extcon_set_property_capability(info->edev, EXTCON_USB,
	455	EXTCON_PROP_USB_SS);
	456	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
	457	EXTCON_PROP_USB_SS);
c6983166 BL	458	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
	459	EXTCON_PROP_USB_SS);
	460	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
	461	EXTCON_PROP_DISP_HPD);
	462
c7eb47f9 BL	463	info->dr = DR_NONE;
	464	info->pr = false;
	465
c6983166 BL	466	platform_set_drvdata(pdev, info);
	467
	468	/* Get PD events from the EC */
	469	info->notifier.notifier_call = extcon_cros_ec_event;
	470	ret = blocking_notifier_chain_register(&info->ec->event_notifier,
	471	&info->notifier);
	472	if (ret < 0) {
	473	dev_err(dev, "failed to register notifier\n");
	474	return ret;
	475	}
	476
	477	/* Perform initial detection */
	478	ret = extcon_cros_ec_detect_cable(info, true);
	479	if (ret < 0) {
	480	dev_err(dev, "failed to detect initial cable state\n");
	481	goto unregister_notifier;
	482	}
	483
	484	return 0;
	485
	486	unregister_notifier:
	487	blocking_notifier_chain_unregister(&info->ec->event_notifier,
	488	&info->notifier);
	489	return ret;
	490	}
	491
	492	static int extcon_cros_ec_remove(struct platform_device *pdev)
	493	{
	494	struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
	495
	496	blocking_notifier_chain_unregister(&info->ec->event_notifier,
	497	&info->notifier);
	498
	499	return 0;
	500	}
	501
	502	#ifdef CONFIG_PM_SLEEP
	503	static int extcon_cros_ec_suspend(struct device *dev)
	504	{
	505	return 0;
	506	}
	507
	508	static int extcon_cros_ec_resume(struct device *dev)
	509	{
	510	int ret;
	511	struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
	512
	513	ret = extcon_cros_ec_detect_cable(info, true);
	514	if (ret < 0)
	515	dev_err(dev, "failed to detect cable state on resume\n");
	516
	517	return 0;
	518	}
	519
	520	static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
	521	SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
	522	};
	523
	524	#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
	525	#else
	526	#define DEV_PM_OPS NULL
	527	#endif /* CONFIG_PM_SLEEP */
	528
	529	#ifdef CONFIG_OF
530	static const struct of_device_id extcon_cros_ec_of_match[] = {
531	{ .compatible = "google,extcon-usbc-cros-ec" },
532	{ /* sentinel */ }
533	};
534	MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
535	#endif /* CONFIG_OF */
536
537	static struct platform_driver extcon_cros_ec_driver = {
538	.driver = {
539	.name = "extcon-usbc-cros-ec",
540	.of_match_table = of_match_ptr(extcon_cros_ec_of_match),
541	.pm = DEV_PM_OPS,
542	},
543	.remove = extcon_cros_ec_remove,
544	.probe = extcon_cros_ec_probe,
545	};
546
547	module_platform_driver(extcon_cros_ec_driver);
548
549	MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
550	MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
551	MODULE_LICENSE("GPL");