[mirror_ubuntu-artful-kernel.git] / drivers / soc / qcom / wcnss_ctrl.c

/*
 * Copyright (c) 2016, Linaro Ltd.
 * Copyright (c) 2015, Sony Mobile Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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/firmware.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/rpmsg.h>
#include <linux/soc/qcom/wcnss_ctrl.h>

#define WCNSS_REQUEST_TIMEOUT	(5 * HZ)
#define WCNSS_CBC_TIMEOUT	(10 * HZ)

#define WCNSS_ACK_DONE_BOOTING	1
#define WCNSS_ACK_COLD_BOOTING	2

#define NV_FRAGMENT_SIZE	3072
#define NVBIN_FILE		"wlan/prima/WCNSS_qcom_wlan_nv.bin"

/**
 * struct wcnss_ctrl - driver context
 * @dev:	device handle
 * @channel:	SMD channel handle
 * @ack:	completion for outstanding requests
 * @cbc:	completion for cbc complete indication
 * @ack_status:	status of the outstanding request
 * @probe_work: worker for uploading nv binary
 */
struct wcnss_ctrl {
	struct device *dev;
	struct rpmsg_endpoint *channel;

	struct completion ack;
	struct completion cbc;
	int ack_status;

	struct work_struct probe_work;
};

/* message types */
enum {
	WCNSS_VERSION_REQ = 0x01000000,
	WCNSS_VERSION_RESP,
	WCNSS_DOWNLOAD_NV_REQ,
	WCNSS_DOWNLOAD_NV_RESP,
	WCNSS_UPLOAD_CAL_REQ,
	WCNSS_UPLOAD_CAL_RESP,
	WCNSS_DOWNLOAD_CAL_REQ,
	WCNSS_DOWNLOAD_CAL_RESP,
	WCNSS_VBAT_LEVEL_IND,
	WCNSS_BUILD_VERSION_REQ,
	WCNSS_BUILD_VERSION_RESP,
	WCNSS_PM_CONFIG_REQ,
	WCNSS_CBC_COMPLETE_IND,
};

/**
 * struct wcnss_msg_hdr - common packet header for requests and responses
 * @type:	packet message type
 * @len:	total length of the packet, including this header
 */
struct wcnss_msg_hdr {
	u32 type;
	u32 len;
} __packed;

/**
 * struct wcnss_version_resp - version request response
 * @hdr:	common packet wcnss_msg_hdr header
 */
struct wcnss_version_resp {
	struct wcnss_msg_hdr hdr;
	u8 major;
	u8 minor;
	u8 version;
	u8 revision;
} __packed;

/**
 * struct wcnss_download_nv_req - firmware fragment request
 * @hdr:	common packet wcnss_msg_hdr header
 * @seq:	sequence number of this fragment
 * @last:	boolean indicator of this being the last fragment of the binary
 * @frag_size:	length of this fragment
 * @fragment:	fragment data
 */
struct wcnss_download_nv_req {
	struct wcnss_msg_hdr hdr;
	u16 seq;
	u16 last;
	u32 frag_size;
	u8 fragment[];
} __packed;

/**
 * struct wcnss_download_nv_resp - firmware download response
 * @hdr:	common packet wcnss_msg_hdr header
 * @status:	boolean to indicate success of the download
 */
struct wcnss_download_nv_resp {
	struct wcnss_msg_hdr hdr;
	u8 status;
} __packed;

/**
 * wcnss_ctrl_smd_callback() - handler from SMD responses
 * @channel:	smd channel handle
 * @data:	pointer to the incoming data packet
 * @count:	size of the incoming data packet
 *
 * Handles any incoming packets from the remote WCNSS_CTRL service.
 */
static int wcnss_ctrl_smd_callback(struct rpmsg_device *rpdev,
				   void *data,
				   int count,
				   void *priv,
				   u32 addr)
{
	struct wcnss_ctrl *wcnss = dev_get_drvdata(&rpdev->dev);
	const struct wcnss_download_nv_resp *nvresp;
	const struct wcnss_version_resp *version;
	const struct wcnss_msg_hdr *hdr = data;

	switch (hdr->type) {
	case WCNSS_VERSION_RESP:
		if (count != sizeof(*version)) {
			dev_err(wcnss->dev,
				"invalid size of version response\n");
			break;
		}

		version = data;
		dev_info(wcnss->dev, "WCNSS Version %d.%d %d.%d\n",
			 version->major, version->minor,
			 version->version, version->revision);

		complete(&wcnss->ack);
		break;
	case WCNSS_DOWNLOAD_NV_RESP:
		if (count != sizeof(*nvresp)) {
			dev_err(wcnss->dev,
				"invalid size of download response\n");
			break;
		}

		nvresp = data;
		wcnss->ack_status = nvresp->status;
		complete(&wcnss->ack);
		break;
	case WCNSS_CBC_COMPLETE_IND:
		dev_dbg(wcnss->dev, "cold boot complete\n");
		complete(&wcnss->cbc);
		break;
	default:
		dev_info(wcnss->dev, "unknown message type %d\n", hdr->type);
		break;
	}

	return 0;
}

/**
 * wcnss_request_version() - send a version request to WCNSS
 * @wcnss:	wcnss ctrl driver context
 */
static int wcnss_request_version(struct wcnss_ctrl *wcnss)
{
	struct wcnss_msg_hdr msg;
	int ret;

	msg.type = WCNSS_VERSION_REQ;
	msg.len = sizeof(msg);
	ret = rpmsg_send(wcnss->channel, &msg, sizeof(msg));
	if (ret < 0)
		return ret;

	ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_CBC_TIMEOUT);
	if (!ret) {
		dev_err(wcnss->dev, "timeout waiting for version response\n");
		return -ETIMEDOUT;
	}

	return 0;
}

/**
 * wcnss_download_nv() - send nv binary to WCNSS
 * @wcnss:	wcnss_ctrl state handle
 * @expect_cbc:	indicator to caller that an cbc event is expected
 *
 * Returns 0 on success. Negative errno on failure.
 */
static int wcnss_download_nv(struct wcnss_ctrl *wcnss, bool *expect_cbc)
{
	struct wcnss_download_nv_req *req;
	const struct firmware *fw;
	const void *data;
	ssize_t left;
	int ret;

	req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
	if (ret < 0) {
		dev_err(wcnss->dev, "Failed to load nv file %s: %d\n",
			NVBIN_FILE, ret);
		goto free_req;
	}

	data = fw->data;
	left = fw->size;

	req->hdr.type = WCNSS_DOWNLOAD_NV_REQ;
	req->hdr.len = sizeof(*req) + NV_FRAGMENT_SIZE;

	req->last = 0;
	req->frag_size = NV_FRAGMENT_SIZE;

	req->seq = 0;
	do {
		if (left <= NV_FRAGMENT_SIZE) {
			req->last = 1;
			req->frag_size = left;
			req->hdr.len = sizeof(*req) + left;
		}

		memcpy(req->fragment, data, req->frag_size);

		ret = rpmsg_send(wcnss->channel, req, req->hdr.len);
		if (ret < 0) {
			dev_err(wcnss->dev, "failed to send smd packet\n");
			goto release_fw;
		}

		/* Increment for next fragment */
		req->seq++;

		data += req->hdr.len;
		left -= NV_FRAGMENT_SIZE;
	} while (left > 0);

	ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_REQUEST_TIMEOUT);
	if (!ret) {
		dev_err(wcnss->dev, "timeout waiting for nv upload ack\n");
		ret = -ETIMEDOUT;
	} else {
		*expect_cbc = wcnss->ack_status == WCNSS_ACK_COLD_BOOTING;
		ret = 0;
	}

release_fw:
	release_firmware(fw);
free_req:
	kfree(req);

	return ret;
}

/**
 * qcom_wcnss_open_channel() - open additional SMD channel to WCNSS
 * @wcnss:	wcnss handle, retrieved from drvdata
 * @name:	SMD channel name
 * @cb:		callback to handle incoming data on the channel
 */
struct rpmsg_endpoint *qcom_wcnss_open_channel(void *wcnss, const char *name, rpmsg_rx_cb_t cb, void *priv)
{
	struct rpmsg_channel_info chinfo;
	struct wcnss_ctrl *_wcnss = wcnss;

	strncpy(chinfo.name, name, sizeof(chinfo.name));
	chinfo.src = RPMSG_ADDR_ANY;
	chinfo.dst = RPMSG_ADDR_ANY;

	return rpmsg_create_ept(_wcnss->channel->rpdev, cb, priv, chinfo);
}
EXPORT_SYMBOL(qcom_wcnss_open_channel);

static void wcnss_async_probe(struct work_struct *work)
{
	struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, probe_work);
	bool expect_cbc;
	int ret;

	ret = wcnss_request_version(wcnss);
	if (ret < 0)
		return;

	ret = wcnss_download_nv(wcnss, &expect_cbc);
	if (ret < 0)
		return;

	/* Wait for pending cold boot completion if indicated by the nv downloader */
	if (expect_cbc) {
		ret = wait_for_completion_timeout(&wcnss->cbc, WCNSS_REQUEST_TIMEOUT);
		if (!ret)
			dev_err(wcnss->dev, "expected cold boot completion\n");
	}

	of_platform_populate(wcnss->dev->of_node, NULL, NULL, wcnss->dev);
}

static int wcnss_ctrl_probe(struct rpmsg_device *rpdev)
{
	struct wcnss_ctrl *wcnss;

	wcnss = devm_kzalloc(&rpdev->dev, sizeof(*wcnss), GFP_KERNEL);
	if (!wcnss)
		return -ENOMEM;

	wcnss->dev = &rpdev->dev;
	wcnss->channel = rpdev->ept;

	init_completion(&wcnss->ack);
	init_completion(&wcnss->cbc);
	INIT_WORK(&wcnss->probe_work, wcnss_async_probe);

	dev_set_drvdata(&rpdev->dev, wcnss);

	schedule_work(&wcnss->probe_work);

	return 0;
}

static void wcnss_ctrl_remove(struct rpmsg_device *rpdev)
{
	struct wcnss_ctrl *wcnss = dev_get_drvdata(&rpdev->dev);

	cancel_work_sync(&wcnss->probe_work);
	of_platform_depopulate(&rpdev->dev);
}

static const struct of_device_id wcnss_ctrl_of_match[] = {
	{ .compatible = "qcom,wcnss", },
	{}
};

static struct rpmsg_driver wcnss_ctrl_driver = {
	.probe = wcnss_ctrl_probe,
	.remove = wcnss_ctrl_remove,
	.callback = wcnss_ctrl_smd_callback,
	.drv  = {
		.name  = "qcom_wcnss_ctrl",
		.owner = THIS_MODULE,
		.of_match_table = wcnss_ctrl_of_match,
	},
};

module_rpmsg_driver(wcnss_ctrl_driver);

MODULE_DESCRIPTION("Qualcomm WCNSS control driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
ea7a1f27	1	/*
6be2b3d0	2	* Copyright (c) 2016, Linaro Ltd.
ea7a1f27 BA	3	* Copyright (c) 2015, Sony Mobile Communications Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 and
	7	* only version 2 as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14	#include <linux/firmware.h>
	15	#include <linux/module.h>
	16	#include <linux/slab.h>
6be2b3d0 BA	17	#include <linux/io.h>
	18	#include <linux/of_platform.h>
	19	#include <linux/platform_device.h>
5052de8d	20	#include <linux/rpmsg.h>
6be2b3d0	21	#include <linux/soc/qcom/wcnss_ctrl.h>
ea7a1f27 BA	22
ea7a1f27 BA	23	#define WCNSS_REQUEST_TIMEOUT (5 * HZ)
6be2b3d0 BA	24	#define WCNSS_CBC_TIMEOUT (10 * HZ)
	25
	26	#define WCNSS_ACK_DONE_BOOTING 1
	27	#define WCNSS_ACK_COLD_BOOTING 2
ea7a1f27 BA	28
	29	#define NV_FRAGMENT_SIZE 3072
	30	#define NVBIN_FILE "wlan/prima/WCNSS_qcom_wlan_nv.bin"
	31
	32	/**
	33	* struct wcnss_ctrl - driver context
	34	* @dev: device handle
	35	* @channel: SMD channel handle
	36	* @ack: completion for outstanding requests
6be2b3d0	37	* @cbc: completion for cbc complete indication
ea7a1f27	38	* @ack_status: status of the outstanding request
6be2b3d0	39	* @probe_work: worker for uploading nv binary
ea7a1f27 BA	40	*/
	41	struct wcnss_ctrl {
	42	struct device *dev;
5052de8d	43	struct rpmsg_endpoint *channel;
ea7a1f27 BA	44
ea7a1f27 BA	45	struct completion ack;
6be2b3d0	46	struct completion cbc;
ea7a1f27 BA	47	int ack_status;
ea7a1f27 BA	48
6be2b3d0	49	struct work_struct probe_work;
ea7a1f27 BA	50	};
	51
	52	/* message types */
	53	enum {
	54	WCNSS_VERSION_REQ = 0x01000000,
	55	WCNSS_VERSION_RESP,
	56	WCNSS_DOWNLOAD_NV_REQ,
	57	WCNSS_DOWNLOAD_NV_RESP,
	58	WCNSS_UPLOAD_CAL_REQ,
	59	WCNSS_UPLOAD_CAL_RESP,
	60	WCNSS_DOWNLOAD_CAL_REQ,
	61	WCNSS_DOWNLOAD_CAL_RESP,
6be2b3d0 BA	62	WCNSS_VBAT_LEVEL_IND,
	63	WCNSS_BUILD_VERSION_REQ,
	64	WCNSS_BUILD_VERSION_RESP,
	65	WCNSS_PM_CONFIG_REQ,
	66	WCNSS_CBC_COMPLETE_IND,
ea7a1f27 BA	67	};
	68
	69	/**
	70	* struct wcnss_msg_hdr - common packet header for requests and responses
	71	* @type: packet message type
	72	* @len: total length of the packet, including this header
	73	*/
	74	struct wcnss_msg_hdr {
	75	u32 type;
	76	u32 len;
	77	} __packed;
	78
	79	/**
	80	* struct wcnss_version_resp - version request response
	81	* @hdr: common packet wcnss_msg_hdr header
	82	*/
	83	struct wcnss_version_resp {
	84	struct wcnss_msg_hdr hdr;
	85	u8 major;
	86	u8 minor;
	87	u8 version;
	88	u8 revision;
	89	} __packed;
	90
	91	/**
	92	* struct wcnss_download_nv_req - firmware fragment request
	93	* @hdr: common packet wcnss_msg_hdr header
	94	* @seq: sequence number of this fragment
	95	* @last: boolean indicator of this being the last fragment of the binary
	96	* @frag_size: length of this fragment
	97	* @fragment: fragment data
	98	*/
	99	struct wcnss_download_nv_req {
	100	struct wcnss_msg_hdr hdr;
	101	u16 seq;
	102	u16 last;
	103	u32 frag_size;
	104	u8 fragment[];
	105	} __packed;
	106
	107	/**
	108	* struct wcnss_download_nv_resp - firmware download response
	109	* @hdr: common packet wcnss_msg_hdr header
	110	* @status: boolean to indicate success of the download
	111	*/
	112	struct wcnss_download_nv_resp {
	113	struct wcnss_msg_hdr hdr;
	114	u8 status;
	115	} __packed;
	116
	117	/**
	118	* wcnss_ctrl_smd_callback() - handler from SMD responses
b853cb96	119	* @channel: smd channel handle
ea7a1f27 BA	120	* @data: pointer to the incoming data packet
	121	* @count: size of the incoming data packet
	122	*
	123	* Handles any incoming packets from the remote WCNSS_CTRL service.
	124	*/
5052de8d BA	125	static int wcnss_ctrl_smd_callback(struct rpmsg_device *rpdev,
	126	void *data,
	127	int count,
	128	void *priv,
	129	u32 addr)
ea7a1f27	130	{
5052de8d	131	struct wcnss_ctrl *wcnss = dev_get_drvdata(&rpdev->dev);
ea7a1f27 BA	132	const struct wcnss_download_nv_resp *nvresp;
	133	const struct wcnss_version_resp *version;
	134	const struct wcnss_msg_hdr *hdr = data;
	135
	136	switch (hdr->type) {
	137	case WCNSS_VERSION_RESP:
	138	if (count != sizeof(*version)) {
	139	dev_err(wcnss->dev,
	140	"invalid size of version response\n");
	141	break;
	142	}
	143
	144	version = data;
	145	dev_info(wcnss->dev, "WCNSS Version %d.%d %d.%d\n",
	146	version->major, version->minor,
	147	version->version, version->revision);
	148
6be2b3d0	149	complete(&wcnss->ack);
ea7a1f27 BA	150	break;
	151	case WCNSS_DOWNLOAD_NV_RESP:
	152	if (count != sizeof(*nvresp)) {
	153	dev_err(wcnss->dev,
	154	"invalid size of download response\n");
	155	break;
	156	}
	157
	158	nvresp = data;
	159	wcnss->ack_status = nvresp->status;
	160	complete(&wcnss->ack);
	161	break;
6be2b3d0 BA	162	case WCNSS_CBC_COMPLETE_IND:
	163	dev_dbg(wcnss->dev, "cold boot complete\n");
	164	complete(&wcnss->cbc);
	165	break;
ea7a1f27 BA	166	default:
	167	dev_info(wcnss->dev, "unknown message type %d\n", hdr->type);
	168	break;
	169	}
	170
	171	return 0;
	172	}
	173
	174	/**
	175	* wcnss_request_version() - send a version request to WCNSS
	176	* @wcnss: wcnss ctrl driver context
	177	*/
	178	static int wcnss_request_version(struct wcnss_ctrl *wcnss)
	179	{
	180	struct wcnss_msg_hdr msg;
6be2b3d0	181	int ret;
ea7a1f27 BA	182
	183	msg.type = WCNSS_VERSION_REQ;
	184	msg.len = sizeof(msg);
5052de8d	185	ret = rpmsg_send(wcnss->channel, &msg, sizeof(msg));
6be2b3d0 BA	186	if (ret < 0)
	187	return ret;
	188
	189	ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_CBC_TIMEOUT);
	190	if (!ret) {
	191	dev_err(wcnss->dev, "timeout waiting for version response\n");
	192	return -ETIMEDOUT;
	193	}
ea7a1f27	194
6be2b3d0	195	return 0;
ea7a1f27 BA	196	}
	197
	198	/**
	199	* wcnss_download_nv() - send nv binary to WCNSS
6be2b3d0 BA	200	* @wcnss: wcnss_ctrl state handle
	201	* @expect_cbc: indicator to caller that an cbc event is expected
	202	*
	203	* Returns 0 on success. Negative errno on failure.
ea7a1f27	204	*/
6be2b3d0	205	static int wcnss_download_nv(struct wcnss_ctrl wcnss, bool expect_cbc)
ea7a1f27	206	{
ea7a1f27 BA	207	struct wcnss_download_nv_req *req;
	208	const struct firmware *fw;
	209	const void *data;
	210	ssize_t left;
	211	int ret;
	212
	213	req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
	214	if (!req)
6be2b3d0	215	return -ENOMEM;
ea7a1f27 BA	216
ea7a1f27 BA	217	ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
6be2b3d0	218	if (ret < 0) {
ea7a1f27 BA	219	dev_err(wcnss->dev, "Failed to load nv file %s: %d\n",
	220	NVBIN_FILE, ret);
	221	goto free_req;
	222	}
	223
	224	data = fw->data;
	225	left = fw->size;
	226
	227	req->hdr.type = WCNSS_DOWNLOAD_NV_REQ;
	228	req->hdr.len = sizeof(*req) + NV_FRAGMENT_SIZE;
	229
	230	req->last = 0;
	231	req->frag_size = NV_FRAGMENT_SIZE;
	232
	233	req->seq = 0;
	234	do {
	235	if (left <= NV_FRAGMENT_SIZE) {
	236	req->last = 1;
	237	req->frag_size = left;
	238	req->hdr.len = sizeof(*req) + left;
	239	}
	240
	241	memcpy(req->fragment, data, req->frag_size);
	242
5052de8d	243	ret = rpmsg_send(wcnss->channel, req, req->hdr.len);
6be2b3d0	244	if (ret < 0) {
ea7a1f27 BA	245	dev_err(wcnss->dev, "failed to send smd packet\n");
	246	goto release_fw;
	247	}
	248
	249	/* Increment for next fragment */
	250	req->seq++;
	251
	252	data += req->hdr.len;
	253	left -= NV_FRAGMENT_SIZE;
	254	} while (left > 0);
	255
	256	ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_REQUEST_TIMEOUT);
6be2b3d0	257	if (!ret) {
ea7a1f27	258	dev_err(wcnss->dev, "timeout waiting for nv upload ack\n");
6be2b3d0 BA	259	ret = -ETIMEDOUT;
	260	} else {
	261	*expect_cbc = wcnss->ack_status == WCNSS_ACK_COLD_BOOTING;
	262	ret = 0;
	263	}
ea7a1f27 BA	264
	265	release_fw:
	266	release_firmware(fw);
	267	free_req:
	268	kfree(req);
6be2b3d0 BA	269
	270	return ret;
	271	}
	272
	273	/**
	274	* qcom_wcnss_open_channel() - open additional SMD channel to WCNSS
	275	* @wcnss: wcnss handle, retrieved from drvdata
	276	* @name: SMD channel name
	277	* @cb: callback to handle incoming data on the channel
	278	*/
5052de8d	279	struct rpmsg_endpoint qcom_wcnss_open_channel(void wcnss, const char name, rpmsg_rx_cb_t cb, void priv)
6be2b3d0	280	{
5052de8d	281	struct rpmsg_channel_info chinfo;
6be2b3d0 BA	282	struct wcnss_ctrl *_wcnss = wcnss;
6be2b3d0 BA	283
5052de8d BA	284	strncpy(chinfo.name, name, sizeof(chinfo.name));
	285	chinfo.src = RPMSG_ADDR_ANY;
	286	chinfo.dst = RPMSG_ADDR_ANY;
	287
	288	return rpmsg_create_ept(_wcnss->channel->rpdev, cb, priv, chinfo);
6be2b3d0 BA	289	}
	290	EXPORT_SYMBOL(qcom_wcnss_open_channel);
	291
	292	static void wcnss_async_probe(struct work_struct *work)
	293	{
	294	struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, probe_work);
	295	bool expect_cbc;
	296	int ret;
	297
	298	ret = wcnss_request_version(wcnss);
	299	if (ret < 0)
	300	return;
	301
	302	ret = wcnss_download_nv(wcnss, &expect_cbc);
	303	if (ret < 0)
	304	return;
	305
	306	/* Wait for pending cold boot completion if indicated by the nv downloader */
	307	if (expect_cbc) {
	308	ret = wait_for_completion_timeout(&wcnss->cbc, WCNSS_REQUEST_TIMEOUT);
	309	if (!ret)
	310	dev_err(wcnss->dev, "expected cold boot completion\n");
	311	}
	312
	313	of_platform_populate(wcnss->dev->of_node, NULL, NULL, wcnss->dev);
ea7a1f27 BA	314	}
ea7a1f27 BA	315
5052de8d	316	static int wcnss_ctrl_probe(struct rpmsg_device *rpdev)
ea7a1f27 BA	317	{
	318	struct wcnss_ctrl *wcnss;
	319
5052de8d	320	wcnss = devm_kzalloc(&rpdev->dev, sizeof(*wcnss), GFP_KERNEL);
ea7a1f27 BA	321	if (!wcnss)
	322	return -ENOMEM;
	323
5052de8d BA	324	wcnss->dev = &rpdev->dev;
5052de8d BA	325	wcnss->channel = rpdev->ept;
ea7a1f27 BA	326
ea7a1f27 BA	327	init_completion(&wcnss->ack);
6be2b3d0 BA	328	init_completion(&wcnss->cbc);
6be2b3d0 BA	329	INIT_WORK(&wcnss->probe_work, wcnss_async_probe);
ea7a1f27	330
5052de8d	331	dev_set_drvdata(&rpdev->dev, wcnss);
6be2b3d0 BA	332
	333	schedule_work(&wcnss->probe_work);
	334
	335	return 0;
	336	}
	337
5052de8d	338	static void wcnss_ctrl_remove(struct rpmsg_device *rpdev)
6be2b3d0	339	{
5052de8d	340	struct wcnss_ctrl *wcnss = dev_get_drvdata(&rpdev->dev);
ea7a1f27	341
6be2b3d0	342	cancel_work_sync(&wcnss->probe_work);
5052de8d	343	of_platform_depopulate(&rpdev->dev);
ea7a1f27 BA	344	}
ea7a1f27 BA	345
6be2b3d0 BA	346	static const struct of_device_id wcnss_ctrl_of_match[] = {
6be2b3d0 BA	347	{ .compatible = "qcom,wcnss", },
ea7a1f27 BA	348	{}
	349	};
	350
5052de8d	351	static struct rpmsg_driver wcnss_ctrl_driver = {
ea7a1f27	352	.probe = wcnss_ctrl_probe,
6be2b3d0	353	.remove = wcnss_ctrl_remove,
ea7a1f27	354	.callback = wcnss_ctrl_smd_callback,
5052de8d	355	.drv = {
ea7a1f27 BA	356	.name = "qcom_wcnss_ctrl",
ea7a1f27 BA	357	.owner = THIS_MODULE,
6be2b3d0	358	.of_match_table = wcnss_ctrl_of_match,
ea7a1f27 BA	359	},
	360	};
	361
5052de8d	362	module_rpmsg_driver(wcnss_ctrl_driver);
ea7a1f27 BA	363
	364	MODULE_DESCRIPTION("Qualcomm WCNSS control driver");
	365	MODULE_LICENSE("GPL v2");