[mirror_ubuntu-bionic-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;

	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);
	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;
	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");
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
	37	bool dp; /* DisplayPort enabled */
	38	bool mux; /* SuperSpeed (usb3) enabled */
	39	unsigned int power_type;
	40	};
	41
	42	static const unsigned int usb_type_c_cable[] = {
	43	EXTCON_DISP_DP,
	44	EXTCON_NONE,
	45	};
	46
	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;
153	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
154	&pd_control, sizeof(pd_control),
155	&resp, sizeof(resp));
156	if (ret < 0)
157	return ret;
158
159	if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
160	return -ENOTCONN;
161
162	*polarity = resp.polarity;
163
164	return resp.role;
165	}
166
167	/**
168	* cros_ec_pd_get_num_ports() - Get number of EC charge ports.
169	* @info: pointer to struct cros_ec_extcon_info
170	*
171	* Return: number of ports on success, <0 on failure.
172	*/
173	static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
174	{
175	struct ec_response_usb_pd_ports resp;
176	int ret;
177
178	ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
179	0, NULL, 0, &resp, sizeof(resp));
180	if (ret < 0)
181	return ret;
182
183	return resp.num_ports;
184	}
185
186	static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
187	bool force)
188	{
189	struct device *dev = info->dev;
190	int role, power_type;
191	bool polarity = false;
192	bool dp = false;
193	bool mux = false;
194	bool hpd = false;
195
196	power_type = cros_ec_usb_get_power_type(info);
197	if (power_type < 0) {
198	dev_err(dev, "failed getting power type err = %d\n",
199	power_type);
200	return power_type;
201	}
202
203	role = cros_ec_usb_get_role(info, &polarity);
204	if (role < 0) {
205	if (role != -ENOTCONN) {
206	dev_err(dev, "failed getting role err = %d\n", role);
207	return role;
208	}
209	} else {
210	int pd_mux_state;
211
212	pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
213	if (pd_mux_state < 0)
214	pd_mux_state = USB_PD_MUX_USB_ENABLED;
215
216	dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
217	mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
218	hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
219	}
220
221	if (force \|\| info->dp != dp \|\| info->mux != mux \|\|
222	info->power_type != power_type) {
223
224	info->dp = dp;
225	info->mux = mux;
226	info->power_type = power_type;
227
228	extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
229
230	extcon_set_property(info->edev, EXTCON_DISP_DP,
231	EXTCON_PROP_USB_TYPEC_POLARITY,
232	(union extcon_property_value)(int)polarity);
233	extcon_set_property(info->edev, EXTCON_DISP_DP,
234	EXTCON_PROP_USB_SS,
235	(union extcon_property_value)(int)mux);
236	extcon_set_property(info->edev, EXTCON_DISP_DP,
237	EXTCON_PROP_DISP_HPD,
238	(union extcon_property_value)(int)hpd);
239
240	extcon_sync(info->edev, EXTCON_DISP_DP);
241
242	} else if (hpd) {
243	extcon_set_property(info->edev, EXTCON_DISP_DP,
244	EXTCON_PROP_DISP_HPD,
245	(union extcon_property_value)(int)hpd);
246	extcon_sync(info->edev, EXTCON_DISP_DP);
247	}
248
249	return 0;
250	}
251
252	static int extcon_cros_ec_event(struct notifier_block *nb,
253	unsigned long queued_during_suspend,
254	void *_notify)
255	{
256	struct cros_ec_extcon_info *info;
257	struct cros_ec_device *ec;
258	u32 host_event;
259
260	info = container_of(nb, struct cros_ec_extcon_info, notifier);
261	ec = info->ec;
262
263	host_event = cros_ec_get_host_event(ec);
264	if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) \|
265	EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
266	extcon_cros_ec_detect_cable(info, false);
267	return NOTIFY_OK;
268	}
269
270	return NOTIFY_DONE;
271	}
272
273	static int extcon_cros_ec_probe(struct platform_device *pdev)
274	{
275	struct cros_ec_extcon_info *info;
276	struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
277	struct device *dev = &pdev->dev;
278	struct device_node *np = dev->of_node;
279	int numports, ret;
280
281	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
282	if (!info)
283	return -ENOMEM;
284
285	info->dev = dev;
286	info->ec = ec;
287
288	if (np) {
289	u32 port;
290
291	ret = of_property_read_u32(np, "google,usb-port-id", &port);
292	if (ret < 0) {
293	dev_err(dev, "Missing google,usb-port-id property\n");
294	return ret;
295	}
296	info->port_id = port;
297	} else {
298	info->port_id = pdev->id;
299	}
300
301	numports = cros_ec_pd_get_num_ports(info);
302	if (numports < 0) {
303	dev_err(dev, "failed getting number of ports! ret = %d\n",
304	numports);
305	return numports;
306	}
307
308	if (info->port_id >= numports) {
309	dev_err(dev, "This system only supports %d ports\n", numports);
310	return -ENODEV;
311	}
312
313	info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
314	if (IS_ERR(info->edev)) {
315	dev_err(dev, "failed to allocate extcon device\n");
316	return -ENOMEM;
317	}
318
319	ret = devm_extcon_dev_register(dev, info->edev);
320	if (ret < 0) {
321	dev_err(dev, "failed to register extcon device\n");
322	return ret;
323	}
324
325	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
326	EXTCON_PROP_USB_TYPEC_POLARITY);
327	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
328	EXTCON_PROP_USB_SS);
329	extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
330	EXTCON_PROP_DISP_HPD);
331
332	platform_set_drvdata(pdev, info);
333
334	/* Get PD events from the EC */
335	info->notifier.notifier_call = extcon_cros_ec_event;
336	ret = blocking_notifier_chain_register(&info->ec->event_notifier,
337	&info->notifier);
338	if (ret < 0) {
339	dev_err(dev, "failed to register notifier\n");
340	return ret;
341	}
342
343	/* Perform initial detection */
344	ret = extcon_cros_ec_detect_cable(info, true);
345	if (ret < 0) {
346	dev_err(dev, "failed to detect initial cable state\n");
347	goto unregister_notifier;
348	}
349
350	return 0;
351
352	unregister_notifier:
353	blocking_notifier_chain_unregister(&info->ec->event_notifier,
354	&info->notifier);
355	return ret;
356	}
357
358	static int extcon_cros_ec_remove(struct platform_device *pdev)
359	{
360	struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
361
362	blocking_notifier_chain_unregister(&info->ec->event_notifier,
363	&info->notifier);
364
365	return 0;
366	}
367
368	#ifdef CONFIG_PM_SLEEP
369	static int extcon_cros_ec_suspend(struct device *dev)
370	{
371	return 0;
372	}
373
374	static int extcon_cros_ec_resume(struct device *dev)
375	{
376	int ret;
377	struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
378
379	ret = extcon_cros_ec_detect_cable(info, true);
380	if (ret < 0)
381	dev_err(dev, "failed to detect cable state on resume\n");
382
383	return 0;
384	}
385
386	static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
387	SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
388	};
389
390	#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
391	#else
392	#define DEV_PM_OPS NULL
393	#endif /* CONFIG_PM_SLEEP */
394
395	#ifdef CONFIG_OF
396	static const struct of_device_id extcon_cros_ec_of_match[] = {
397	{ .compatible = "google,extcon-usbc-cros-ec" },
398	{ /* sentinel */ }
399	};
400	MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
401	#endif /* CONFIG_OF */
402
403	static struct platform_driver extcon_cros_ec_driver = {
404	.driver = {
405	.name = "extcon-usbc-cros-ec",
406	.of_match_table = of_match_ptr(extcon_cros_ec_of_match),
407	.pm = DEV_PM_OPS,
408	},
409	.remove = extcon_cros_ec_remove,
410	.probe = extcon_cros_ec_probe,
411	};
412
413	module_platform_driver(extcon_cros_ec_driver);
414
415	MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
416	MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
417	MODULE_LICENSE("GPL");