[linux-2.6-block.git] / drivers / extcon / extcon-usbc-cros-ec.c

// SPDX-License-Identifier: GPL-2.0
// ChromeOS Embedded Controller extcon
//
// Copyright (C) 2017 Google, Inc.
// Author: Benson Leung <bleung@chromium.org>

#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 v2");
Commit	Line	Data
11bab5a2 EBS	1	// SPDX-License-Identifier: GPL-2.0
	2	// ChromeOS Embedded Controller extcon
	3	//
	4	// Copyright (C) 2017 Google, Inc.
	5	// Author: Benson Leung <bleung@chromium.org>
c6983166	6
176aa360	7	#include <linux/extcon-provider.h>
c6983166 BL	8	#include <linux/kernel.h>
	9	#include <linux/mfd/cros_ec.h>
	10	#include <linux/module.h>
	11	#include <linux/notifier.h>
	12	#include <linux/of.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/slab.h>
	15	#include <linux/sched.h>
	16
	17	struct cros_ec_extcon_info {
	18	struct device *dev;
	19	struct extcon_dev *edev;
	20
	21	int port_id;
	22
	23	struct cros_ec_device *ec;
	24
	25	struct notifier_block notifier;
	26
c7eb47f9 BL	27	unsigned int dr; /* data role */
c7eb47f9 BL	28	bool pr; /* power role (true if VBUS enabled) */
c6983166 BL	29	bool dp; /* DisplayPort enabled */
	30	bool mux; /* SuperSpeed (usb3) enabled */
	31	unsigned int power_type;
	32	};
	33
	34	static const unsigned int usb_type_c_cable[] = {
c7eb47f9 BL	35	EXTCON_USB,
c7eb47f9 BL	36	EXTCON_USB_HOST,
c6983166 BL	37	EXTCON_DISP_DP,
	38	EXTCON_NONE,
	39	};
	40
c7eb47f9 BL	41	enum usb_data_roles {
	42	DR_NONE,
	43	DR_HOST,
	44	DR_DEVICE,
	45	};
	46
c6983166 BL	47	/**
	48	* cros_ec_pd_command() - Send a command to the EC.
	49	* @info: pointer to struct cros_ec_extcon_info
	50	* @command: EC command
	51	* @version: EC command version
	52	* @outdata: EC command output data
	53	* @outsize: Size of outdata
	54	* @indata: EC command input data
	55	* @insize: Size of indata
	56	*
	57	* Return: 0 on success, <0 on failure.
	58	*/
	59	static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
	60	unsigned int command,
	61	unsigned int version,
	62	void *outdata,
	63	unsigned int outsize,
	64	void *indata,
	65	unsigned int insize)
	66	{
	67	struct cros_ec_command *msg;
	68	int ret;
	69
	70	msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
1cf76c4e CJ	71	if (!msg)
1cf76c4e CJ	72	return -ENOMEM;
c6983166 BL	73
	74	msg->version = version;
	75	msg->command = command;
	76	msg->outsize = outsize;
	77	msg->insize = insize;
	78
	79	if (outsize)
	80	memcpy(msg->data, outdata, outsize);
	81
	82	ret = cros_ec_cmd_xfer_status(info->ec, msg);
	83	if (ret >= 0 && insize)
	84	memcpy(indata, msg->data, insize);
	85
	86	kfree(msg);
	87	return ret;
	88	}
	89
	90	/**
	91	* cros_ec_usb_get_power_type() - Get power type info about PD device attached
	92	* to given port.
	93	* @info: pointer to struct cros_ec_extcon_info
	94	*
	95	* Return: power type on success, <0 on failure.
	96	*/
	97	static int cros_ec_usb_get_power_type(struct cros_ec_extcon_info *info)
	98	{
	99	struct ec_params_usb_pd_power_info req;
	100	struct ec_response_usb_pd_power_info resp;
	101	int ret;
	102
	103	req.port = info->port_id;
	104	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_POWER_INFO, 0,
	105	&req, sizeof(req), &resp, sizeof(resp));
	106	if (ret < 0)
	107	return ret;
	108
	109	return resp.type;
	110	}
	111
	112	/**
	113	* cros_ec_usb_get_pd_mux_state() - Get PD mux state for given port.
	114	* @info: pointer to struct cros_ec_extcon_info
	115	*
	116	* Return: PD mux state on success, <0 on failure.
	117	*/
	118	static int cros_ec_usb_get_pd_mux_state(struct cros_ec_extcon_info *info)
	119	{
	120	struct ec_params_usb_pd_mux_info req;
	121	struct ec_response_usb_pd_mux_info resp;
	122	int ret;
	123
	124	req.port = info->port_id;
	125	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_MUX_INFO, 0,
	126	&req, sizeof(req),
	127	&resp, sizeof(resp));
	128	if (ret < 0)
	129	return ret;
	130
	131	return resp.flags;
	132	}
	133
	134	/**
	135	* cros_ec_usb_get_role() - Get role info about possible PD device attached to a
	136	* given port.
137	* @info: pointer to struct cros_ec_extcon_info
138	* @polarity: pointer to cable polarity (return value)
139	*
140	* Return: role info on success, -ENOTCONN if no cable is connected, <0 on
141	* failure.
142	*/
143	static int cros_ec_usb_get_role(struct cros_ec_extcon_info *info,
144	bool *polarity)
145	{
146	struct ec_params_usb_pd_control pd_control;
147	struct ec_response_usb_pd_control_v1 resp;
148	int ret;
149
150	pd_control.port = info->port_id;
151	pd_control.role = USB_PD_CTRL_ROLE_NO_CHANGE;
152	pd_control.mux = USB_PD_CTRL_MUX_NO_CHANGE;
c7eb47f9	153	pd_control.swap = USB_PD_CTRL_SWAP_NONE;
c6983166 BL	154	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
	155	&pd_control, sizeof(pd_control),
	156	&resp, sizeof(resp));
	157	if (ret < 0)
	158	return ret;
	159
	160	if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
	161	return -ENOTCONN;
	162
	163	*polarity = resp.polarity;
	164
	165	return resp.role;
	166	}
	167
	168	/**
	169	* cros_ec_pd_get_num_ports() - Get number of EC charge ports.
	170	* @info: pointer to struct cros_ec_extcon_info
	171	*
	172	* Return: number of ports on success, <0 on failure.
	173	*/
	174	static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
	175	{
	176	struct ec_response_usb_pd_ports resp;
	177	int ret;
	178
	179	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
	180	0, NULL, 0, &resp, sizeof(resp));
	181	if (ret < 0)
	182	return ret;
	183
	184	return resp.num_ports;
	185	}
	186
c7eb47f9 BL	187	static const char *cros_ec_usb_role_string(unsigned int role)
	188	{
	189	return role == DR_NONE ? "DISCONNECTED" :
	190	(role == DR_HOST ? "DFP" : "UFP");
	191	}
	192
	193	static const char *cros_ec_usb_power_type_string(unsigned int type)
	194	{
	195	switch (type) {
	196	case USB_CHG_TYPE_NONE:
	197	return "USB_CHG_TYPE_NONE";
	198	case USB_CHG_TYPE_PD:
	199	return "USB_CHG_TYPE_PD";
	200	case USB_CHG_TYPE_PROPRIETARY:
	201	return "USB_CHG_TYPE_PROPRIETARY";
	202	case USB_CHG_TYPE_C:
	203	return "USB_CHG_TYPE_C";
	204	case USB_CHG_TYPE_BC12_DCP:
	205	return "USB_CHG_TYPE_BC12_DCP";
	206	case USB_CHG_TYPE_BC12_CDP:
	207	return "USB_CHG_TYPE_BC12_CDP";
	208	case USB_CHG_TYPE_BC12_SDP:
	209	return "USB_CHG_TYPE_BC12_SDP";
	210	case USB_CHG_TYPE_OTHER:
	211	return "USB_CHG_TYPE_OTHER";
	212	case USB_CHG_TYPE_VBUS:
	213	return "USB_CHG_TYPE_VBUS";
	214	case USB_CHG_TYPE_UNKNOWN:
	215	return "USB_CHG_TYPE_UNKNOWN";
	216	default:
	217	return "USB_CHG_TYPE_UNKNOWN";
	218	}
	219	}
	220
	221	static bool cros_ec_usb_power_type_is_wall_wart(unsigned int type,
	222	unsigned int role)
	223	{
	224	switch (type) {
	225	/* FIXME : Guppy, Donnettes, and other chargers will be miscategorized
	226	* because they identify with USB_CHG_TYPE_C, but we can't return true
	227	* here from that code because that breaks Suzy-Q and other kinds of
	228	* USB Type-C cables and peripherals.
	229	*/
	230	case USB_CHG_TYPE_PROPRIETARY:
	231	case USB_CHG_TYPE_BC12_DCP:
	232	return true;
	233	case USB_CHG_TYPE_PD:
	234	case USB_CHG_TYPE_C:
	235	case USB_CHG_TYPE_BC12_CDP:
	236	case USB_CHG_TYPE_BC12_SDP:
	237	case USB_CHG_TYPE_OTHER:
	238	case USB_CHG_TYPE_VBUS:
	239	case USB_CHG_TYPE_UNKNOWN:
	240	case USB_CHG_TYPE_NONE:
	241	default:
	242	return false;
	243	}
	244	}
	245
c6983166 BL	246	static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
	247	bool force)
	248	{
	249	struct device *dev = info->dev;
	250	int role, power_type;
c7eb47f9 BL	251	unsigned int dr = DR_NONE;
c7eb47f9 BL	252	bool pr = false;
c6983166 BL	253	bool polarity = false;
	254	bool dp = false;
	255	bool mux = false;
	256	bool hpd = false;
	257
	258	power_type = cros_ec_usb_get_power_type(info);
	259	if (power_type < 0) {
	260	dev_err(dev, "failed getting power type err = %d\n",
	261	power_type);
	262	return power_type;
	263	}
	264
	265	role = cros_ec_usb_get_role(info, &polarity);
	266	if (role < 0) {
	267	if (role != -ENOTCONN) {
	268	dev_err(dev, "failed getting role err = %d\n", role);
	269	return role;
	270	}
c7eb47f9	271	dev_dbg(dev, "disconnected\n");
c6983166 BL	272	} else {
	273	int pd_mux_state;
	274
c7eb47f9 BL	275	dr = (role & PD_CTRL_RESP_ROLE_DATA) ? DR_HOST : DR_DEVICE;
c7eb47f9 BL	276	pr = (role & PD_CTRL_RESP_ROLE_POWER);
c6983166 BL	277	pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
	278	if (pd_mux_state < 0)
	279	pd_mux_state = USB_PD_MUX_USB_ENABLED;
	280
	281	dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
	282	mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
	283	hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
c6983166	284
c7eb47f9 BL	285	dev_dbg(dev,
	286	"connected role 0x%x pwr type %d dr %d pr %d pol %d mux %d dp %d hpd %d\n",
	287	role, power_type, dr, pr, polarity, mux, dp, hpd);
	288	}
c6983166	289
c7eb47f9 BL	290	/*
	291	* When there is no USB host (e.g. USB PD charger),
	292	* we are not really a UFP for the AP.
	293	*/
	294	if (dr == DR_DEVICE &&
	295	cros_ec_usb_power_type_is_wall_wart(power_type, role))
	296	dr = DR_NONE;
	297
	298	if (force \|\| info->dr != dr \|\| info->pr != pr \|\| info->dp != dp \|\|
	299	info->mux != mux \|\| info->power_type != power_type) {
	300	bool host_connected = false, device_connected = false;
	301
	302	dev_dbg(dev, "Type/Role switch! type = %s role = %s\n",
	303	cros_ec_usb_power_type_string(power_type),
	304	cros_ec_usb_role_string(dr));
	305	info->dr = dr;
	306	info->pr = pr;
c6983166 BL	307	info->dp = dp;
	308	info->mux = mux;
	309	info->power_type = power_type;
	310
c7eb47f9 BL	311	if (dr == DR_DEVICE)
	312	device_connected = true;
	313	else if (dr == DR_HOST)
	314	host_connected = true;
c6983166	315
c7eb47f9 BL	316	extcon_set_state(info->edev, EXTCON_USB, device_connected);
	317	extcon_set_state(info->edev, EXTCON_USB_HOST, host_connected);
	318	extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
	319	extcon_set_property(info->edev, EXTCON_USB,
	320	EXTCON_PROP_USB_VBUS,
	321	(union extcon_property_value)(int)pr);
	322	extcon_set_property(info->edev, EXTCON_USB_HOST,
	323	EXTCON_PROP_USB_VBUS,
	324	(union extcon_property_value)(int)pr);
	325	extcon_set_property(info->edev, EXTCON_USB,
	326	EXTCON_PROP_USB_TYPEC_POLARITY,
	327	(union extcon_property_value)(int)polarity);
	328	extcon_set_property(info->edev, EXTCON_USB_HOST,
	329	EXTCON_PROP_USB_TYPEC_POLARITY,
	330	(union extcon_property_value)(int)polarity);
c6983166 BL	331	extcon_set_property(info->edev, EXTCON_DISP_DP,
	332	EXTCON_PROP_USB_TYPEC_POLARITY,
	333	(union extcon_property_value)(int)polarity);
c7eb47f9 BL	334	extcon_set_property(info->edev, EXTCON_USB,
	335	EXTCON_PROP_USB_SS,
	336	(union extcon_property_value)(int)mux);
	337	extcon_set_property(info->edev, EXTCON_USB_HOST,
	338	EXTCON_PROP_USB_SS,
	339	(union extcon_property_value)(int)mux);
c6983166 BL	340	extcon_set_property(info->edev, EXTCON_DISP_DP,
	341	EXTCON_PROP_USB_SS,
	342	(union extcon_property_value)(int)mux);
	343	extcon_set_property(info->edev, EXTCON_DISP_DP,
	344	EXTCON_PROP_DISP_HPD,
	345	(union extcon_property_value)(int)hpd);
	346
c7eb47f9 BL	347	extcon_sync(info->edev, EXTCON_USB);
c7eb47f9 BL	348	extcon_sync(info->edev, EXTCON_USB_HOST);
c6983166 BL	349	extcon_sync(info->edev, EXTCON_DISP_DP);
	350
	351	} else if (hpd) {
	352	extcon_set_property(info->edev, EXTCON_DISP_DP,
	353	EXTCON_PROP_DISP_HPD,
	354	(union extcon_property_value)(int)hpd);
	355	extcon_sync(info->edev, EXTCON_DISP_DP);
	356	}
	357
	358	return 0;
	359	}
	360
	361	static int extcon_cros_ec_event(struct notifier_block *nb,
	362	unsigned long queued_during_suspend,
	363	void *_notify)
	364	{
	365	struct cros_ec_extcon_info *info;
	366	struct cros_ec_device *ec;
	367	u32 host_event;
	368
	369	info = container_of(nb, struct cros_ec_extcon_info, notifier);
	370	ec = info->ec;
	371
	372	host_event = cros_ec_get_host_event(ec);
	373	if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) \|
	374	EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
	375	extcon_cros_ec_detect_cable(info, false);
	376	return NOTIFY_OK;
	377	}
	378
	379	return NOTIFY_DONE;
	380	}
	381
	382	static int extcon_cros_ec_probe(struct platform_device *pdev)
	383	{
	384	struct cros_ec_extcon_info *info;
	385	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
	386	struct device *dev = &pdev->dev;
	387	struct device_node *np = dev->of_node;
	388	int numports, ret;
	389
	390	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	391	if (!info)
	392	return -ENOMEM;
	393
	394	info->dev = dev;
	395	info->ec = ec;
	396
	397	if (np) {
	398	u32 port;
	399
	400	ret = of_property_read_u32(np, "google,usb-port-id", &port);
	401	if (ret < 0) {
	402	dev_err(dev, "Missing google,usb-port-id property\n");
	403	return ret;
	404	}
	405	info->port_id = port;
	406	} else {
	407	info->port_id = pdev->id;
	408	}
	409
	410	numports = cros_ec_pd_get_num_ports(info);
	411	if (numports < 0) {
	412	dev_err(dev, "failed getting number of ports! ret = %d\n",
413	numports);
414	return numports;
415	}
416
417	if (info->port_id >= numports) {
418	dev_err(dev, "This system only supports %d ports\n", numports);
419	return -ENODEV;
420	}
421
422	info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
423	if (IS_ERR(info->edev)) {
424	dev_err(dev, "failed to allocate extcon device\n");
425	return -ENOMEM;
426	}
427
428	ret = devm_extcon_dev_register(dev, info->edev);
429	if (ret < 0) {
430	dev_err(dev, "failed to register extcon device\n");
431	return ret;
432	}
433
c7eb47f9 BL	434	extcon_set_property_capability(info->edev, EXTCON_USB,
	435	EXTCON_PROP_USB_VBUS);
	436	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
	437	EXTCON_PROP_USB_VBUS);
	438	extcon_set_property_capability(info->edev, EXTCON_USB,
	439	EXTCON_PROP_USB_TYPEC_POLARITY);
	440	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
	441	EXTCON_PROP_USB_TYPEC_POLARITY);
c6983166 BL	442	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
c6983166 BL	443	EXTCON_PROP_USB_TYPEC_POLARITY);
c7eb47f9 BL	444	extcon_set_property_capability(info->edev, EXTCON_USB,
	445	EXTCON_PROP_USB_SS);
	446	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
	447	EXTCON_PROP_USB_SS);
c6983166 BL	448	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
	449	EXTCON_PROP_USB_SS);
	450	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
	451	EXTCON_PROP_DISP_HPD);
	452
c7eb47f9 BL	453	info->dr = DR_NONE;
	454	info->pr = false;
	455
c6983166 BL	456	platform_set_drvdata(pdev, info);
	457
	458	/* Get PD events from the EC */
	459	info->notifier.notifier_call = extcon_cros_ec_event;
	460	ret = blocking_notifier_chain_register(&info->ec->event_notifier,
	461	&info->notifier);
	462	if (ret < 0) {
	463	dev_err(dev, "failed to register notifier\n");
	464	return ret;
	465	}
	466
	467	/* Perform initial detection */
	468	ret = extcon_cros_ec_detect_cable(info, true);
	469	if (ret < 0) {
	470	dev_err(dev, "failed to detect initial cable state\n");
	471	goto unregister_notifier;
	472	}
	473
	474	return 0;
	475
	476	unregister_notifier:
	477	blocking_notifier_chain_unregister(&info->ec->event_notifier,
	478	&info->notifier);
	479	return ret;
	480	}
	481
	482	static int extcon_cros_ec_remove(struct platform_device *pdev)
	483	{
	484	struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
	485
	486	blocking_notifier_chain_unregister(&info->ec->event_notifier,
	487	&info->notifier);
	488
	489	return 0;
	490	}
	491
	492	#ifdef CONFIG_PM_SLEEP
	493	static int extcon_cros_ec_suspend(struct device *dev)
	494	{
	495	return 0;
	496	}
	497
	498	static int extcon_cros_ec_resume(struct device *dev)
	499	{
	500	int ret;
	501	struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
	502
	503	ret = extcon_cros_ec_detect_cable(info, true);
	504	if (ret < 0)
	505	dev_err(dev, "failed to detect cable state on resume\n");
	506
	507	return 0;
	508	}
	509
	510	static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
	511	SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
	512	};
	513
	514	#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
	515	#else
	516	#define DEV_PM_OPS NULL
	517	#endif /* CONFIG_PM_SLEEP */
	518
	519	#ifdef CONFIG_OF
520	static const struct of_device_id extcon_cros_ec_of_match[] = {
521	{ .compatible = "google,extcon-usbc-cros-ec" },
522	{ /* sentinel */ }
523	};
524	MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
525	#endif /* CONFIG_OF */
526
527	static struct platform_driver extcon_cros_ec_driver = {
528	.driver = {
529	.name = "extcon-usbc-cros-ec",
530	.of_match_table = of_match_ptr(extcon_cros_ec_of_match),
531	.pm = DEV_PM_OPS,
532	},
533	.remove = extcon_cros_ec_remove,
534	.probe = extcon_cros_ec_probe,
535	};
536
537	module_platform_driver(extcon_cros_ec_driver);
538
539	MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
540	MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
686b3058	541	MODULE_LICENSE("GPL v2");