[deliverable/linux.git] / drivers / net / wireless / ath / ath9k / wmi.c

/*
 * Copyright (c) 2010 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "htc.h"

static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)
{
	switch (wmi_cmd) {
	case WMI_ECHO_CMDID:
		return "WMI_ECHO_CMDID";
	case WMI_ACCESS_MEMORY_CMDID:
		return "WMI_ACCESS_MEMORY_CMDID";
	case WMI_DISABLE_INTR_CMDID:
		return "WMI_DISABLE_INTR_CMDID";
	case WMI_ENABLE_INTR_CMDID:
		return "WMI_ENABLE_INTR_CMDID";
	case WMI_RX_LINK_CMDID:
		return "WMI_RX_LINK_CMDID";
	case WMI_ATH_INIT_CMDID:
		return "WMI_ATH_INIT_CMDID";
	case WMI_ABORT_TXQ_CMDID:
		return "WMI_ABORT_TXQ_CMDID";
	case WMI_STOP_TX_DMA_CMDID:
		return "WMI_STOP_TX_DMA_CMDID";
	case WMI_STOP_DMA_RECV_CMDID:
		return "WMI_STOP_DMA_RECV_CMDID";
	case WMI_ABORT_TX_DMA_CMDID:
		return "WMI_ABORT_TX_DMA_CMDID";
	case WMI_DRAIN_TXQ_CMDID:
		return "WMI_DRAIN_TXQ_CMDID";
	case WMI_DRAIN_TXQ_ALL_CMDID:
		return "WMI_DRAIN_TXQ_ALL_CMDID";
	case WMI_START_RECV_CMDID:
		return "WMI_START_RECV_CMDID";
	case WMI_STOP_RECV_CMDID:
		return "WMI_STOP_RECV_CMDID";
	case WMI_FLUSH_RECV_CMDID:
		return "WMI_FLUSH_RECV_CMDID";
	case WMI_SET_MODE_CMDID:
		return "WMI_SET_MODE_CMDID";
	case WMI_RESET_CMDID:
		return "WMI_RESET_CMDID";
	case WMI_NODE_CREATE_CMDID:
		return "WMI_NODE_CREATE_CMDID";
	case WMI_NODE_REMOVE_CMDID:
		return "WMI_NODE_REMOVE_CMDID";
	case WMI_VAP_REMOVE_CMDID:
		return "WMI_VAP_REMOVE_CMDID";
	case WMI_VAP_CREATE_CMDID:
		return "WMI_VAP_CREATE_CMDID";
	case WMI_BEACON_UPDATE_CMDID:
		return "WMI_BEACON_UPDATE_CMDID";
	case WMI_REG_READ_CMDID:
		return "WMI_REG_READ_CMDID";
	case WMI_REG_WRITE_CMDID:
		return "WMI_REG_WRITE_CMDID";
	case WMI_RC_STATE_CHANGE_CMDID:
		return "WMI_RC_STATE_CHANGE_CMDID";
	case WMI_RC_RATE_UPDATE_CMDID:
		return "WMI_RC_RATE_UPDATE_CMDID";
	case WMI_DEBUG_INFO_CMDID:
		return "WMI_DEBUG_INFO_CMDID";
	case WMI_HOST_ATTACH:
		return "WMI_HOST_ATTACH";
	case WMI_TARGET_IC_UPDATE_CMDID:
		return "WMI_TARGET_IC_UPDATE_CMDID";
	case WMI_TGT_STATS_CMDID:
		return "WMI_TGT_STATS_CMDID";
	case WMI_TX_AGGR_ENABLE_CMDID:
		return "WMI_TX_AGGR_ENABLE_CMDID";
	case WMI_TGT_DETACH_CMDID:
		return "WMI_TGT_DETACH_CMDID";
	case WMI_TGT_TXQ_ENABLE_CMDID:
		return "WMI_TGT_TXQ_ENABLE_CMDID";
	case WMI_AGGR_LIMIT_CMD:
		return "WMI_AGGR_LIMIT_CMD";
	}

	return "Bogus";
}

struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
{
	struct wmi *wmi;

	wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
	if (!wmi)
		return NULL;

	wmi->drv_priv = priv;
	wmi->stopped = false;
	mutex_init(&wmi->op_mutex);
	mutex_init(&wmi->multi_write_mutex);
	init_completion(&wmi->cmd_wait);

	return wmi;
}

void ath9k_deinit_wmi(struct ath9k_htc_priv *priv)
{
	struct wmi *wmi = priv->wmi;

	mutex_lock(&wmi->op_mutex);
	wmi->stopped = true;
	mutex_unlock(&wmi->op_mutex);

	kfree(priv->wmi);
}

void ath9k_swba_tasklet(unsigned long data)
{
	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;

	ath9k_htc_swba(priv, priv->wmi->beacon_pending);
}

void ath9k_fatal_work(struct work_struct *work)
{
	struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
						   fatal_work);
	struct ath_common *common = ath9k_hw_common(priv->ah);

	ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
	ath9k_htc_reset(priv);
}

static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
{
	skb_pull(skb, sizeof(struct wmi_cmd_hdr));

	if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
		memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);

	complete(&wmi->cmd_wait);
}

static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
			      enum htc_endpoint_id epid)
{
	struct wmi *wmi = (struct wmi *) priv;
	struct wmi_cmd_hdr *hdr;
	u16 cmd_id;
	void *wmi_event;
#ifdef CONFIG_ATH9K_HTC_DEBUGFS
	__be32 txrate;
#endif

	if (unlikely(wmi->stopped))
		goto free_skb;

	hdr = (struct wmi_cmd_hdr *) skb->data;
	cmd_id = be16_to_cpu(hdr->command_id);

	if (cmd_id & 0x1000) {
		wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
		switch (cmd_id) {
		case WMI_SWBA_EVENTID:
			wmi->beacon_pending = *(u8 *)wmi_event;
			tasklet_schedule(&wmi->drv_priv->swba_tasklet);
			break;
		case WMI_FATAL_EVENTID:
			ieee80211_queue_work(wmi->drv_priv->hw,
					     &wmi->drv_priv->fatal_work);
			break;
		case WMI_TXRATE_EVENTID:
#ifdef CONFIG_ATH9K_HTC_DEBUGFS
			txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
			wmi->drv_priv->debug.txrate = be32_to_cpu(txrate);
#endif
			break;
		default:
			break;
		}
		kfree_skb(skb);
		return;
	}

	/* Check if there has been a timeout. */
	spin_lock(&wmi->wmi_lock);
	if (cmd_id != wmi->last_cmd_id) {
		spin_unlock(&wmi->wmi_lock);
		goto free_skb;
	}
	spin_unlock(&wmi->wmi_lock);

	/* WMI command response */
	ath9k_wmi_rsp_callback(wmi, skb);

free_skb:
	kfree_skb(skb);
}

static void ath9k_wmi_ctrl_tx(void *priv, struct sk_buff *skb,
			      enum htc_endpoint_id epid, bool txok)
{
	kfree_skb(skb);
}

int ath9k_wmi_connect(struct htc_target *htc, struct wmi *wmi,
		      enum htc_endpoint_id *wmi_ctrl_epid)
{
	struct htc_service_connreq connect;
	int ret;

	wmi->htc = htc;

	memset(&connect, 0, sizeof(connect));

	connect.ep_callbacks.priv = wmi;
	connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
	connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
	connect.service_id = WMI_CONTROL_SVC;

	ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
	if (ret)
		return ret;

	*wmi_ctrl_epid = wmi->ctrl_epid;

	return 0;
}

static int ath9k_wmi_cmd_issue(struct wmi *wmi,
			       struct sk_buff *skb,
			       enum wmi_cmd_id cmd, u16 len)
{
	struct wmi_cmd_hdr *hdr;

	hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
	hdr->command_id = cpu_to_be16(cmd);
	hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);

	return htc_send(wmi->htc, skb, wmi->ctrl_epid, NULL);
}

int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
		  u8 *cmd_buf, u32 cmd_len,
		  u8 *rsp_buf, u32 rsp_len,
		  u32 timeout)
{
	struct ath_hw *ah = wmi->drv_priv->ah;
	struct ath_common *common = ath9k_hw_common(ah);
	u16 headroom = sizeof(struct htc_frame_hdr) +
		       sizeof(struct wmi_cmd_hdr);
	struct sk_buff *skb;
	u8 *data;
	int time_left, ret = 0;
	unsigned long flags;

	if (ah->ah_flags & AH_UNPLUGGED)
		return 0;

	skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
	if (!skb)
		return -ENOMEM;

	skb_reserve(skb, headroom);

	if (cmd_len != 0 && cmd_buf != NULL) {
		data = (u8 *) skb_put(skb, cmd_len);
		memcpy(data, cmd_buf, cmd_len);
	}

	mutex_lock(&wmi->op_mutex);

	/* check if wmi stopped flag is set */
	if (unlikely(wmi->stopped)) {
		ret = -EPROTO;
		goto out;
	}

	/* record the rsp buffer and length */
	wmi->cmd_rsp_buf = rsp_buf;
	wmi->cmd_rsp_len = rsp_len;

	spin_lock_irqsave(&wmi->wmi_lock, flags);
	wmi->last_cmd_id = cmd_id;
	spin_unlock_irqrestore(&wmi->wmi_lock, flags);

	ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
	if (ret)
		goto out;

	time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
	if (!time_left) {
		ath_dbg(common, ATH_DBG_WMI,
			"Timeout waiting for WMI command: %s\n",
			wmi_cmd_to_name(cmd_id));
		mutex_unlock(&wmi->op_mutex);
		return -ETIMEDOUT;
	}

	mutex_unlock(&wmi->op_mutex);

	return 0;

out:
	ath_dbg(common, ATH_DBG_WMI,
		"WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
	mutex_unlock(&wmi->op_mutex);
	kfree_skb(skb);

	return ret;
}
Commit	Line	Data
fb9987d0 S	1	/*
	2	* Copyright (c) 2010 Atheros Communications Inc.
	3	*
	4	* Permission to use, copy, modify, and/or distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
	17	#include "htc.h"
	18
	19	static const char *wmi_cmd_to_name(enum wmi_cmd_id wmi_cmd)
	20	{
	21	switch (wmi_cmd) {
	22	case WMI_ECHO_CMDID:
	23	return "WMI_ECHO_CMDID";
	24	case WMI_ACCESS_MEMORY_CMDID:
	25	return "WMI_ACCESS_MEMORY_CMDID";
	26	case WMI_DISABLE_INTR_CMDID:
	27	return "WMI_DISABLE_INTR_CMDID";
	28	case WMI_ENABLE_INTR_CMDID:
	29	return "WMI_ENABLE_INTR_CMDID";
	30	case WMI_RX_LINK_CMDID:
	31	return "WMI_RX_LINK_CMDID";
	32	case WMI_ATH_INIT_CMDID:
	33	return "WMI_ATH_INIT_CMDID";
	34	case WMI_ABORT_TXQ_CMDID:
	35	return "WMI_ABORT_TXQ_CMDID";
	36	case WMI_STOP_TX_DMA_CMDID:
	37	return "WMI_STOP_TX_DMA_CMDID";
	38	case WMI_STOP_DMA_RECV_CMDID:
	39	return "WMI_STOP_DMA_RECV_CMDID";
	40	case WMI_ABORT_TX_DMA_CMDID:
	41	return "WMI_ABORT_TX_DMA_CMDID";
	42	case WMI_DRAIN_TXQ_CMDID:
	43	return "WMI_DRAIN_TXQ_CMDID";
	44	case WMI_DRAIN_TXQ_ALL_CMDID:
	45	return "WMI_DRAIN_TXQ_ALL_CMDID";
	46	case WMI_START_RECV_CMDID:
	47	return "WMI_START_RECV_CMDID";
	48	case WMI_STOP_RECV_CMDID:
	49	return "WMI_STOP_RECV_CMDID";
	50	case WMI_FLUSH_RECV_CMDID:
	51	return "WMI_FLUSH_RECV_CMDID";
	52	case WMI_SET_MODE_CMDID:
	53	return "WMI_SET_MODE_CMDID";
	54	case WMI_RESET_CMDID:
	55	return "WMI_RESET_CMDID";
	56	case WMI_NODE_CREATE_CMDID:
	57	return "WMI_NODE_CREATE_CMDID";
	58	case WMI_NODE_REMOVE_CMDID:
	59	return "WMI_NODE_REMOVE_CMDID";
	60	case WMI_VAP_REMOVE_CMDID:
	61	return "WMI_VAP_REMOVE_CMDID";
	62	case WMI_VAP_CREATE_CMDID:
	63	return "WMI_VAP_CREATE_CMDID";
	64	case WMI_BEACON_UPDATE_CMDID:
65	return "WMI_BEACON_UPDATE_CMDID";
66	case WMI_REG_READ_CMDID:
67	return "WMI_REG_READ_CMDID";
68	case WMI_REG_WRITE_CMDID:
69	return "WMI_REG_WRITE_CMDID";
70	case WMI_RC_STATE_CHANGE_CMDID:
71	return "WMI_RC_STATE_CHANGE_CMDID";
72	case WMI_RC_RATE_UPDATE_CMDID:
73	return "WMI_RC_RATE_UPDATE_CMDID";
74	case WMI_DEBUG_INFO_CMDID:
75	return "WMI_DEBUG_INFO_CMDID";
76	case WMI_HOST_ATTACH:
77	return "WMI_HOST_ATTACH";
78	case WMI_TARGET_IC_UPDATE_CMDID:
79	return "WMI_TARGET_IC_UPDATE_CMDID";
80	case WMI_TGT_STATS_CMDID:
81	return "WMI_TGT_STATS_CMDID";
82	case WMI_TX_AGGR_ENABLE_CMDID:
83	return "WMI_TX_AGGR_ENABLE_CMDID";
84	case WMI_TGT_DETACH_CMDID:
85	return "WMI_TGT_DETACH_CMDID";
86	case WMI_TGT_TXQ_ENABLE_CMDID:
87	return "WMI_TGT_TXQ_ENABLE_CMDID";
21cb9879 VN	88	case WMI_AGGR_LIMIT_CMD:
21cb9879 VN	89	return "WMI_AGGR_LIMIT_CMD";
fb9987d0 S	90	}
	91
	92	return "Bogus";
	93	}
	94
	95	struct wmi ath9k_init_wmi(struct ath9k_htc_priv priv)
	96	{
	97	struct wmi *wmi;
	98
	99	wmi = kzalloc(sizeof(struct wmi), GFP_KERNEL);
	100	if (!wmi)
	101	return NULL;
	102
	103	wmi->drv_priv = priv;
	104	wmi->stopped = false;
	105	mutex_init(&wmi->op_mutex);
4a22fe10	106	mutex_init(&wmi->multi_write_mutex);
fb9987d0 S	107	init_completion(&wmi->cmd_wait);
	108
	109	return wmi;
	110	}
	111
	112	void ath9k_deinit_wmi(struct ath9k_htc_priv *priv)
	113	{
	114	struct wmi *wmi = priv->wmi;
	115
	116	mutex_lock(&wmi->op_mutex);
	117	wmi->stopped = true;
	118	mutex_unlock(&wmi->op_mutex);
	119
	120	kfree(priv->wmi);
	121	}
	122
73908674	123	void ath9k_swba_tasklet(unsigned long data)
fb9987d0 S	124	{
fb9987d0 S	125	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )data;
fb9987d0	126
cc0de653	127	ath9k_htc_swba(priv, priv->wmi->beacon_pending);
fb9987d0 S	128	}
fb9987d0 S	129
73908674 SM	130	void ath9k_fatal_work(struct work_struct *work)
	131	{
	132	struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
	133	fatal_work);
	134	struct ath_common *common = ath9k_hw_common(priv->ah);
	135
	136	ath_dbg(common, ATH_DBG_FATAL, "FATAL Event received, resetting device\n");
	137	ath9k_htc_reset(priv);
	138	}
	139
fb9987d0 S	140	static void ath9k_wmi_rsp_callback(struct wmi wmi, struct sk_buff skb)
	141	{
	142	skb_pull(skb, sizeof(struct wmi_cmd_hdr));
	143
	144	if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
	145	memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);
	146
	147	complete(&wmi->cmd_wait);
	148	}
	149
	150	static void ath9k_wmi_ctrl_rx(void priv, struct sk_buff skb,
	151	enum htc_endpoint_id epid)
	152	{
	153	struct wmi wmi = (struct wmi ) priv;
	154	struct wmi_cmd_hdr *hdr;
	155	u16 cmd_id;
cc0de653 RM	156	void *wmi_event;
	157	#ifdef CONFIG_ATH9K_HTC_DEBUGFS
	158	__be32 txrate;
	159	#endif
fb9987d0 S	160
	161	if (unlikely(wmi->stopped))
	162	goto free_skb;
	163
	164	hdr = (struct wmi_cmd_hdr *) skb->data;
	165	cmd_id = be16_to_cpu(hdr->command_id);
	166
	167	if (cmd_id & 0x1000) {
cc0de653 RM	168	wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));
	169	switch (cmd_id) {
	170	case WMI_SWBA_EVENTID:
	171	wmi->beacon_pending = (u8 )wmi_event;
73908674 SM	172	tasklet_schedule(&wmi->drv_priv->swba_tasklet);
	173	break;
	174	case WMI_FATAL_EVENTID:
	175	ieee80211_queue_work(wmi->drv_priv->hw,
	176	&wmi->drv_priv->fatal_work);
cc0de653 RM	177	break;
	178	case WMI_TXRATE_EVENTID:
	179	#ifdef CONFIG_ATH9K_HTC_DEBUGFS
	180	txrate = ((struct wmi_event_txrate *)wmi_event)->txrate;
	181	wmi->drv_priv->debug.txrate = be32_to_cpu(txrate);
	182	#endif
	183	break;
	184	default:
	185	break;
	186	}
	187	kfree_skb(skb);
fb9987d0 S	188	return;
	189	}
	190
6ce34ec1 S	191	/* Check if there has been a timeout. */
	192	spin_lock(&wmi->wmi_lock);
	193	if (cmd_id != wmi->last_cmd_id) {
	194	spin_unlock(&wmi->wmi_lock);
	195	goto free_skb;
	196	}
	197	spin_unlock(&wmi->wmi_lock);
	198
fb9987d0 S	199	/* WMI command response */
	200	ath9k_wmi_rsp_callback(wmi, skb);
	201
	202	free_skb:
e6c6d33c	203	kfree_skb(skb);
fb9987d0 S	204	}
	205
	206	static void ath9k_wmi_ctrl_tx(void priv, struct sk_buff skb,
	207	enum htc_endpoint_id epid, bool txok)
	208	{
0fa35a58	209	kfree_skb(skb);
fb9987d0 S	210	}
	211
	212	int ath9k_wmi_connect(struct htc_target htc, struct wmi wmi,
	213	enum htc_endpoint_id *wmi_ctrl_epid)
	214	{
	215	struct htc_service_connreq connect;
	216	int ret;
	217
	218	wmi->htc = htc;
	219
	220	memset(&connect, 0, sizeof(connect));
	221
	222	connect.ep_callbacks.priv = wmi;
	223	connect.ep_callbacks.tx = ath9k_wmi_ctrl_tx;
	224	connect.ep_callbacks.rx = ath9k_wmi_ctrl_rx;
	225	connect.service_id = WMI_CONTROL_SVC;
	226
	227	ret = htc_connect_service(htc, &connect, &wmi->ctrl_epid);
	228	if (ret)
	229	return ret;
	230
	231	*wmi_ctrl_epid = wmi->ctrl_epid;
	232
	233	return 0;
	234	}
	235
	236	static int ath9k_wmi_cmd_issue(struct wmi *wmi,
	237	struct sk_buff *skb,
	238	enum wmi_cmd_id cmd, u16 len)
	239	{
	240	struct wmi_cmd_hdr *hdr;
	241
	242	hdr = (struct wmi_cmd_hdr *) skb_push(skb, sizeof(struct wmi_cmd_hdr));
	243	hdr->command_id = cpu_to_be16(cmd);
	244	hdr->seq_no = cpu_to_be16(++wmi->tx_seq_id);
	245
	246	return htc_send(wmi->htc, skb, wmi->ctrl_epid, NULL);
	247	}
	248
	249	int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id,
	250	u8 *cmd_buf, u32 cmd_len,
	251	u8 *rsp_buf, u32 rsp_len,
	252	u32 timeout)
	253	{
	254	struct ath_hw *ah = wmi->drv_priv->ah;
	255	struct ath_common *common = ath9k_hw_common(ah);
	256	u16 headroom = sizeof(struct htc_frame_hdr) +
	257	sizeof(struct wmi_cmd_hdr);
	258	struct sk_buff *skb;
	259	u8 *data;
	260	int time_left, ret = 0;
6ce34ec1	261	unsigned long flags;
fb9987d0	262
97dcec57	263	if (ah->ah_flags & AH_UNPLUGGED)
a3be14b7 S	264	return 0;
a3be14b7 S	265
0fa35a58	266	skb = alloc_skb(headroom + cmd_len, GFP_ATOMIC);
fb9987d0 S	267	if (!skb)
	268	return -ENOMEM;
	269
	270	skb_reserve(skb, headroom);
	271
	272	if (cmd_len != 0 && cmd_buf != NULL) {
	273	data = (u8 *) skb_put(skb, cmd_len);
	274	memcpy(data, cmd_buf, cmd_len);
	275	}
	276
	277	mutex_lock(&wmi->op_mutex);
	278
	279	/* check if wmi stopped flag is set */
	280	if (unlikely(wmi->stopped)) {
	281	ret = -EPROTO;
	282	goto out;
	283	}
	284
	285	/* record the rsp buffer and length */
	286	wmi->cmd_rsp_buf = rsp_buf;
	287	wmi->cmd_rsp_len = rsp_len;
	288
6ce34ec1 S	289	spin_lock_irqsave(&wmi->wmi_lock, flags);
	290	wmi->last_cmd_id = cmd_id;
	291	spin_unlock_irqrestore(&wmi->wmi_lock, flags);
	292
0d36d71d S	293	ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len);
	294	if (ret)
	295	goto out;
	296
fb9987d0 S	297	time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout);
fb9987d0 S	298	if (!time_left) {
226afe68 JP	299	ath_dbg(common, ATH_DBG_WMI,
	300	"Timeout waiting for WMI command: %s\n",
	301	wmi_cmd_to_name(cmd_id));
fb9987d0 S	302	mutex_unlock(&wmi->op_mutex);
	303	return -ETIMEDOUT;
	304	}
	305
	306	mutex_unlock(&wmi->op_mutex);
	307
	308	return 0;
	309
	310	out:
226afe68 JP	311	ath_dbg(common, ATH_DBG_WMI,
226afe68 JP	312	"WMI failure for: %s\n", wmi_cmd_to_name(cmd_id));
fb9987d0	313	mutex_unlock(&wmi->op_mutex);
0fa35a58	314	kfree_skb(skb);
fb9987d0 S	315
	316	return ret;
	317	}