[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / caif / cfctrl.c

/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland
 * License terms: GNU General Public License (GPL) version 2
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/stddef.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/pkt_sched.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfctrl.h>

#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
#define UTILITY_NAME_LENGTH 16
#define CFPKT_CTRL_PKT_LEN 20

#ifdef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl,
		       int cmd, struct cfpkt *pkt){
	return -1;
}
#else
static int handle_loop(struct cfctrl *ctrl,
		       int cmd, struct cfpkt *pkt);
#endif
static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			   int phyid);


struct cflayer *cfctrl_create(void)
{
	struct dev_info dev_info;
	struct cfctrl *this =
		kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	if (!this)
		return NULL;
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	memset(&dev_info, 0, sizeof(dev_info));
	dev_info.id = 0xff;
	cfsrvl_init(&this->serv, 0, &dev_info, false);
	atomic_set(&this->req_seq_no, 1);
	atomic_set(&this->rsp_seq_no, 1);
	this->serv.layer.receive = cfctrl_recv;
	sprintf(this->serv.layer.name, "ctrl");
	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
#ifndef CAIF_NO_LOOP
	spin_lock_init(&this->loop_linkid_lock);
	this->loop_linkid = 1;
#endif
	spin_lock_init(&this->info_list_lock);
	INIT_LIST_HEAD(&this->list);
	return &this->serv.layer;
}

void cfctrl_remove(struct cflayer *layer)
{
	struct cfctrl_request_info *p, *tmp;
	struct cfctrl *ctrl = container_obj(layer);

	spin_lock_bh(&ctrl->info_list_lock);
	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		list_del(&p->list);
		kfree(p);
	}
	spin_unlock_bh(&ctrl->info_list_lock);
	kfree(layer);
}

static bool param_eq(const struct cfctrl_link_param *p1,
		     const struct cfctrl_link_param *p2)
{
	bool eq =
	    p1->linktype == p2->linktype &&
	    p1->priority == p2->priority &&
	    p1->phyid == p2->phyid &&
	    p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;

	if (!eq)
		return false;

	switch (p1->linktype) {
	case CFCTRL_SRV_VEI:
		return true;
	case CFCTRL_SRV_DATAGRAM:
		return p1->u.datagram.connid == p2->u.datagram.connid;
	case CFCTRL_SRV_RFM:
		return
		    p1->u.rfm.connid == p2->u.rfm.connid &&
		    strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
	case CFCTRL_SRV_UTIL:
		return
		    p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
		    && p1->u.utility.fifosize_bufs ==
		    p2->u.utility.fifosize_bufs
		    && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
		    && p1->u.utility.paramlen == p2->u.utility.paramlen
		    && memcmp(p1->u.utility.params, p2->u.utility.params,
			      p1->u.utility.paramlen) == 0;

	case CFCTRL_SRV_VIDEO:
		return p1->u.video.connid == p2->u.video.connid;
	case CFCTRL_SRV_DBG:
		return true;
	case CFCTRL_SRV_DECM:
		return false;
	default:
		return false;
	}
	return false;
}

static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
			  const struct cfctrl_request_info *r2)
{
	if (r1->cmd != r2->cmd)
		return false;
	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
		return param_eq(&r1->param, &r2->param);
	else
		return r1->channel_id == r2->channel_id;
}

/* Insert request at the end */
static void cfctrl_insert_req(struct cfctrl *ctrl,
			      struct cfctrl_request_info *req)
{
	spin_lock_bh(&ctrl->info_list_lock);
	atomic_inc(&ctrl->req_seq_no);
	req->sequence_no = atomic_read(&ctrl->req_seq_no);
	list_add_tail(&req->list, &ctrl->list);
	spin_unlock_bh(&ctrl->info_list_lock);
}

/* Compare and remove request */
static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
						struct cfctrl_request_info *req)
{
	struct cfctrl_request_info *p, *tmp, *first;

	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);

	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		if (cfctrl_req_eq(req, p)) {
			if (p != first)
				pr_warn("Requests are not received in order\n");

			atomic_set(&ctrl->rsp_seq_no,
					 p->sequence_no);
			list_del(&p->list);
			goto out;
		}
	}
	p = NULL;
out:
	return p;
}

struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
{
	struct cfctrl *this = container_obj(layer);
	return &this->res;
}

static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
{
	info->hdr_len = 0;
	info->channel_id = cfctrl->serv.layer.id;
	info->dev_info = &cfctrl->serv.dev_info;
}

void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
{
	struct cfpkt *pkt;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cflayer *dn = cfctrl->serv.layer.dn;

	if (!dn) {
		pr_debug("not able to send enum request\n");
		return;
	}
	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt)
		return;
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	init_info(cfpkt_info(pkt), cfctrl);
	cfpkt_info(pkt)->dev_info->id = physlinkid;
	cfctrl->serv.dev_info.id = physlinkid;
	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
	cfpkt_addbdy(pkt, physlinkid);
	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
	dn->transmit(dn, pkt);
}

int cfctrl_linkup_request(struct cflayer *layer,
			  struct cfctrl_link_param *param,
			  struct cflayer *user_layer)
{
	struct cfctrl *cfctrl = container_obj(layer);
	u32 tmp32;
	u16 tmp16;
	u8 tmp8;
	struct cfctrl_request_info *req;
	int ret;
	char utility_name[16];
	struct cfpkt *pkt;
	struct cflayer *dn = cfctrl->serv.layer.dn;

	if (!dn) {
		pr_debug("not able to send linkup request\n");
		return -ENODEV;
	}

	if (cfctrl_cancel_req(layer, user_layer) > 0) {
		/* Slight Paranoia, check if already connecting */
		pr_err("Duplicate connect request for same client\n");
		WARN_ON(1);
		return -EALREADY;
	}

	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt)
		return -ENOMEM;
	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
	cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
	cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
	cfpkt_addbdy(pkt, param->endpoint & 0x03);

	switch (param->linktype) {
	case CFCTRL_SRV_VEI:
		break;
	case CFCTRL_SRV_VIDEO:
		cfpkt_addbdy(pkt, (u8) param->u.video.connid);
		break;
	case CFCTRL_SRV_DBG:
		break;
	case CFCTRL_SRV_DATAGRAM:
		tmp32 = cpu_to_le32(param->u.datagram.connid);
		cfpkt_add_body(pkt, &tmp32, 4);
		break;
	case CFCTRL_SRV_RFM:
		/* Construct a frame, convert DatagramConnectionID to network
		 * format long and copy it out...
		 */
		tmp32 = cpu_to_le32(param->u.rfm.connid);
		cfpkt_add_body(pkt, &tmp32, 4);
		/* Add volume name, including zero termination... */
		cfpkt_add_body(pkt, param->u.rfm.volume,
			       strlen(param->u.rfm.volume) + 1);
		break;
	case CFCTRL_SRV_UTIL:
		tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
		cfpkt_add_body(pkt, &tmp16, 2);
		tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
		cfpkt_add_body(pkt, &tmp16, 2);
		memset(utility_name, 0, sizeof(utility_name));
		strncpy(utility_name, param->u.utility.name,
			UTILITY_NAME_LENGTH - 1);
		cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
		tmp8 = param->u.utility.paramlen;
		cfpkt_add_body(pkt, &tmp8, 1);
		cfpkt_add_body(pkt, param->u.utility.params,
			       param->u.utility.paramlen);
		break;
	default:
		pr_warn("Request setup of bad link type = %d\n",
			param->linktype);
		return -EINVAL;
	}
	req = kzalloc(sizeof(*req), GFP_KERNEL);
	if (!req)
		return -ENOMEM;
	req->client_layer = user_layer;
	req->cmd = CFCTRL_CMD_LINK_SETUP;
	req->param = *param;
	cfctrl_insert_req(cfctrl, req);
	init_info(cfpkt_info(pkt), cfctrl);
	/*
	 * NOTE:Always send linkup and linkdown request on the same
	 *	device as the payload. Otherwise old queued up payload
	 *	might arrive with the newly allocated channel ID.
	 */
	cfpkt_info(pkt)->dev_info->id = param->phyid;
	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
	ret =
	    dn->transmit(dn, pkt);
	if (ret < 0) {
		int count;

		count = cfctrl_cancel_req(&cfctrl->serv.layer,
						user_layer);
		if (count != 1)
			pr_err("Could not remove request (%d)", count);
			return -ENODEV;
	}
	return 0;
}

int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
			struct cflayer *client)
{
	int ret;
	struct cfpkt *pkt;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cflayer *dn = cfctrl->serv.layer.dn;

	if (!dn) {
		pr_debug("not able to send link-down request\n");
		return -ENODEV;
	}
	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt)
		return -ENOMEM;
	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	cfpkt_addbdy(pkt, channelid);
	init_info(cfpkt_info(pkt), cfctrl);
	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
	ret =
	    dn->transmit(dn, pkt);
#ifndef CAIF_NO_LOOP
	cfctrl->loop_linkused[channelid] = 0;
#endif
	return ret;
}

int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
	struct cfctrl_request_info *p, *tmp;
	struct cfctrl *ctrl = container_obj(layr);
	int found = 0;
	spin_lock_bh(&ctrl->info_list_lock);

	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		if (p->client_layer == adap_layer) {
			list_del(&p->list);
			kfree(p);
			found++;
		}
	}

	spin_unlock_bh(&ctrl->info_list_lock);
	return found;
}

static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
{
	u8 cmdrsp;
	u8 cmd;
	int ret = -1;
	u16 tmp16;
	u8 len;
	u8 param[255];
	u8 linkid;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfctrl_request_info rsp, *req;


	cfpkt_extr_head(pkt, &cmdrsp, 1);
	cmd = cmdrsp & CFCTRL_CMD_MASK;
	if (cmd != CFCTRL_CMD_LINK_ERR
	    && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
		&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
		if (handle_loop(cfctrl, cmd, pkt) != 0)
			cmdrsp |= CFCTRL_ERR_BIT;
	}

	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		{
			enum cfctrl_srv serv;
			enum cfctrl_srv servtype;
			u8 endpoint;
			u8 physlinkid;
			u8 prio;
			u8 tmp;
			u32 tmp32;
			u8 *cp;
			int i;
			struct cfctrl_link_param linkparam;
			memset(&linkparam, 0, sizeof(linkparam));

			cfpkt_extr_head(pkt, &tmp, 1);

			serv = tmp & CFCTRL_SRV_MASK;
			linkparam.linktype = serv;

			servtype = tmp >> 4;
			linkparam.chtype = servtype;

			cfpkt_extr_head(pkt, &tmp, 1);
			physlinkid = tmp & 0x07;
			prio = tmp >> 3;

			linkparam.priority = prio;
			linkparam.phyid = physlinkid;
			cfpkt_extr_head(pkt, &endpoint, 1);
			linkparam.endpoint = endpoint & 0x03;

			switch (serv) {
			case CFCTRL_SRV_VEI:
			case CFCTRL_SRV_DBG:
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;
			case CFCTRL_SRV_VIDEO:
				cfpkt_extr_head(pkt, &tmp, 1);
				linkparam.u.video.connid = tmp;
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;

			case CFCTRL_SRV_DATAGRAM:
				cfpkt_extr_head(pkt, &tmp32, 4);
				linkparam.u.datagram.connid =
				    le32_to_cpu(tmp32);
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				break;
			case CFCTRL_SRV_RFM:
				/* Construct a frame, convert
				 * DatagramConnectionID
				 * to network format long and copy it out...
				 */
				cfpkt_extr_head(pkt, &tmp32, 4);
				linkparam.u.rfm.connid =
				  le32_to_cpu(tmp32);
				cp = (u8 *) linkparam.u.rfm.volume;
				for (cfpkt_extr_head(pkt, &tmp, 1);
				     cfpkt_more(pkt) && tmp != '\0';
				     cfpkt_extr_head(pkt, &tmp, 1))
					*cp++ = tmp;
				*cp = '\0';

				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);

				break;
			case CFCTRL_SRV_UTIL:
				/* Construct a frame, convert
				 * DatagramConnectionID
				 * to network format long and copy it out...
				 */
				/* Fifosize KB */
				cfpkt_extr_head(pkt, &tmp16, 2);
				linkparam.u.utility.fifosize_kb =
				    le16_to_cpu(tmp16);
				/* Fifosize bufs */
				cfpkt_extr_head(pkt, &tmp16, 2);
				linkparam.u.utility.fifosize_bufs =
				    le16_to_cpu(tmp16);
				/* name */
				cp = (u8 *) linkparam.u.utility.name;
				caif_assert(sizeof(linkparam.u.utility.name)
					     >= UTILITY_NAME_LENGTH);
				for (i = 0;
				     i < UTILITY_NAME_LENGTH
				     && cfpkt_more(pkt); i++) {
					cfpkt_extr_head(pkt, &tmp, 1);
					*cp++ = tmp;
				}
				/* Length */
				cfpkt_extr_head(pkt, &len, 1);
				linkparam.u.utility.paramlen = len;
				/* Param Data */
				cp = linkparam.u.utility.params;
				while (cfpkt_more(pkt) && len--) {
					cfpkt_extr_head(pkt, &tmp, 1);
					*cp++ = tmp;
				}
				if (CFCTRL_ERR_BIT & cmdrsp)
					break;
				/* Link ID */
				cfpkt_extr_head(pkt, &linkid, 1);
				/* Length */
				cfpkt_extr_head(pkt, &len, 1);
				/* Param Data */
				cfpkt_extr_head(pkt, &param, len);
				break;
			default:
				pr_warn("Request setup, invalid type (%d)\n",
					serv);
				goto error;
			}

			rsp.cmd = cmd;
			rsp.param = linkparam;
			spin_lock_bh(&cfctrl->info_list_lock);
			req = cfctrl_remove_req(cfctrl, &rsp);

			if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
				cfpkt_erroneous(pkt)) {
				pr_err("Invalid O/E bit or parse error "
						"on CAIF control channel\n");
				cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
						       0,
						       req ? req->client_layer
						       : NULL);
			} else {
				cfctrl->res.linksetup_rsp(cfctrl->serv.
							  layer.up, linkid,
							  serv, physlinkid,
							  req ? req->
							  client_layer : NULL);
			}

			kfree(req);

			spin_unlock_bh(&cfctrl->info_list_lock);
		}
		break;
	case CFCTRL_CMD_LINK_DESTROY:
		cfpkt_extr_head(pkt, &linkid, 1);
		cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
		break;
	case CFCTRL_CMD_LINK_ERR:
		pr_err("Frame Error Indication received\n");
		cfctrl->res.linkerror_ind();
		break;
	case CFCTRL_CMD_ENUM:
		cfctrl->res.enum_rsp();
		break;
	case CFCTRL_CMD_SLEEP:
		cfctrl->res.sleep_rsp();
		break;
	case CFCTRL_CMD_WAKE:
		cfctrl->res.wake_rsp();
		break;
	case CFCTRL_CMD_LINK_RECONF:
		cfctrl->res.restart_rsp();
		break;
	case CFCTRL_CMD_RADIO_SET:
		cfctrl->res.radioset_rsp();
		break;
	default:
		pr_err("Unrecognized Control Frame\n");
		goto error;
		break;
	}
	ret = 0;
error:
	cfpkt_destroy(pkt);
	return ret;
}

static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			   int phyid)
{
	struct cfctrl *this = container_obj(layr);
	switch (ctrl) {
	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
	case CAIF_CTRLCMD_FLOW_OFF_IND:
		spin_lock_bh(&this->info_list_lock);
		if (!list_empty(&this->list))
			pr_debug("Received flow off in control layer\n");
		spin_unlock_bh(&this->info_list_lock);
		break;
	case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
		struct cfctrl_request_info *p, *tmp;

		/* Find all connect request and report failure */
		spin_lock_bh(&this->info_list_lock);
		list_for_each_entry_safe(p, tmp, &this->list, list) {
			if (p->param.phyid == phyid) {
				list_del(&p->list);
				p->client_layer->ctrlcmd(p->client_layer,
						CAIF_CTRLCMD_INIT_FAIL_RSP,
						phyid);
				kfree(p);
			}
		}
		spin_unlock_bh(&this->info_list_lock);
		break;
	}
	default:
		break;
	}
}

#ifndef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
{
	static int last_linkid;
	static int dec;
	u8 linkid, linktype, tmp;
	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		spin_lock_bh(&ctrl->loop_linkid_lock);
		if (!dec) {
			for (linkid = last_linkid + 1; linkid < 254; linkid++)
				if (!ctrl->loop_linkused[linkid])
					goto found;
		}
		dec = 1;
		for (linkid = last_linkid - 1; linkid > 1; linkid--)
			if (!ctrl->loop_linkused[linkid])
				goto found;
		spin_unlock_bh(&ctrl->loop_linkid_lock);
		return -1;
found:
		if (linkid < 10)
			dec = 0;

		if (!ctrl->loop_linkused[linkid])
			ctrl->loop_linkused[linkid] = 1;

		last_linkid = linkid;

		cfpkt_add_trail(pkt, &linkid, 1);
		spin_unlock_bh(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linktype, 1);
		if (linktype ==  CFCTRL_SRV_UTIL) {
			tmp = 0x01;
			cfpkt_add_trail(pkt, &tmp, 1);
			cfpkt_add_trail(pkt, &tmp, 1);
		}
		break;

	case CFCTRL_CMD_LINK_DESTROY:
		spin_lock_bh(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linkid, 1);
		ctrl->loop_linkused[linkid] = 0;
		spin_unlock_bh(&ctrl->loop_linkid_lock);
		break;
	default:
		break;
	}
	return 0;
}
#endif
Commit	Line	Data
b482cd20 SB	1	/*
b482cd20 SB	2	* Copyright (C) ST-Ericsson AB 2010
26ee65e6	3	* Author: Sjur Brendeland
b482cd20 SB	4	* License terms: GNU General Public License (GPL) version 2
	5	*/
	6
b31fa5ba JP	7	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
b31fa5ba JP	8
b482cd20 SB	9	#include <linux/stddef.h>
	10	#include <linux/spinlock.h>
	11	#include <linux/slab.h>
44764812	12	#include <linux/pkt_sched.h>
b482cd20 SB	13	#include <net/caif/caif_layer.h>
	14	#include <net/caif/cfpkt.h>
	15	#include <net/caif/cfctrl.h>
	16
	17	#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
	18	#define UTILITY_NAME_LENGTH 16
	19	#define CFPKT_CTRL_PKT_LEN 20
	20
b482cd20 SB	21	#ifdef CAIF_NO_LOOP
b482cd20 SB	22	static int handle_loop(struct cfctrl *ctrl,
3bffc475	23	int cmd, struct cfpkt *pkt){
2aa40aef	24	return -1;
b482cd20 SB	25	}
	26	#else
	27	static int handle_loop(struct cfctrl *ctrl,
3bffc475	28	int cmd, struct cfpkt *pkt);
b482cd20 SB	29	#endif
	30	static int cfctrl_recv(struct cflayer layr, struct cfpkt pkt);
	31	static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
	32	int phyid);
	33
	34
	35	struct cflayer *cfctrl_create(void)
	36	{
8d545c8f	37	struct dev_info dev_info;
b482cd20	38	struct cfctrl *this =
7ac2ed0c JP	39	kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
7ac2ed0c JP	40	if (!this)
b482cd20	41	return NULL;
b482cd20	42	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
8d545c8f SB	43	memset(&dev_info, 0, sizeof(dev_info));
8d545c8f SB	44	dev_info.id = 0xff;
b1c74247	45	cfsrvl_init(&this->serv, 0, &dev_info, false);
b482cd20 SB	46	atomic_set(&this->req_seq_no, 1);
b482cd20 SB	47	atomic_set(&this->rsp_seq_no, 1);
b482cd20 SB	48	this->serv.layer.receive = cfctrl_recv;
	49	sprintf(this->serv.layer.name, "ctrl");
	50	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
c85c2951	51	#ifndef CAIF_NO_LOOP
b482cd20	52	spin_lock_init(&this->loop_linkid_lock);
c85c2951	53	this->loop_linkid = 1;
c85c2951	54	#endif
7aecf494 SB	55	spin_lock_init(&this->info_list_lock);
7aecf494 SB	56	INIT_LIST_HEAD(&this->list);
b482cd20 SB	57	return &this->serv.layer;
	58	}
	59
c85c2951	60	void cfctrl_remove(struct cflayer *layer)
	61	{
	62	struct cfctrl_request_info p, tmp;
	63	struct cfctrl *ctrl = container_obj(layer);
	64
	65	spin_lock_bh(&ctrl->info_list_lock);
	66	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	67	list_del(&p->list);
	68	kfree(p);
	69	}
	70	spin_unlock_bh(&ctrl->info_list_lock);
	71	kfree(layer);
	72	}
	73
73d6ac63	74	static bool param_eq(const struct cfctrl_link_param *p1,
3bffc475	75	const struct cfctrl_link_param *p2)
b482cd20 SB	76	{
	77	bool eq =
	78	p1->linktype == p2->linktype &&
	79	p1->priority == p2->priority &&
	80	p1->phyid == p2->phyid &&
	81	p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
	82
	83	if (!eq)
	84	return false;
	85
	86	switch (p1->linktype) {
	87	case CFCTRL_SRV_VEI:
	88	return true;
	89	case CFCTRL_SRV_DATAGRAM:
	90	return p1->u.datagram.connid == p2->u.datagram.connid;
	91	case CFCTRL_SRV_RFM:
	92	return
	93	p1->u.rfm.connid == p2->u.rfm.connid &&
	94	strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
	95	case CFCTRL_SRV_UTIL:
	96	return
	97	p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
	98	&& p1->u.utility.fifosize_bufs ==
	99	p2->u.utility.fifosize_bufs
	100	&& strcmp(p1->u.utility.name, p2->u.utility.name) == 0
	101	&& p1->u.utility.paramlen == p2->u.utility.paramlen
	102	&& memcmp(p1->u.utility.params, p2->u.utility.params,
	103	p1->u.utility.paramlen) == 0;
	104
	105	case CFCTRL_SRV_VIDEO:
	106	return p1->u.video.connid == p2->u.video.connid;
	107	case CFCTRL_SRV_DBG:
	108	return true;
	109	case CFCTRL_SRV_DECM:
	110	return false;
	111	default:
	112	return false;
	113	}
	114	return false;
	115	}
	116
73d6ac63 SH	117	static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
73d6ac63 SH	118	const struct cfctrl_request_info *r2)
b482cd20 SB	119	{
	120	if (r1->cmd != r2->cmd)
	121	return false;
	122	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
	123	return param_eq(&r1->param, &r2->param);
	124	else
	125	return r1->channel_id == r2->channel_id;
	126	}
	127
	128	/* Insert request at the end */
73d6ac63	129	static void cfctrl_insert_req(struct cfctrl *ctrl,
b482cd20 SB	130	struct cfctrl_request_info *req)
b482cd20 SB	131	{
c85c2951	132	spin_lock_bh(&ctrl->info_list_lock);
b482cd20 SB	133	atomic_inc(&ctrl->req_seq_no);
b482cd20 SB	134	req->sequence_no = atomic_read(&ctrl->req_seq_no);
7aecf494	135	list_add_tail(&req->list, &ctrl->list);
c85c2951	136	spin_unlock_bh(&ctrl->info_list_lock);
b482cd20 SB	137	}
b482cd20 SB	138
b482cd20	139	/* Compare and remove request */
73d6ac63 SH	140	static struct cfctrl_request_info cfctrl_remove_req(struct cfctrl ctrl,
73d6ac63 SH	141	struct cfctrl_request_info *req)
b482cd20	142	{
7aecf494	143	struct cfctrl_request_info p, tmp, *first;
b482cd20	144
7aecf494	145	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
b482cd20	146
7aecf494 SB	147	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	148	if (cfctrl_req_eq(req, p)) {
	149	if (p != first)
b31fa5ba	150	pr_warn("Requests are not received in order\n");
7aecf494	151
b482cd20	152	atomic_set(&ctrl->rsp_seq_no,
7aecf494 SB	153	p->sequence_no);
	154	list_del(&p->list);
	155	goto out;
b482cd20	156	}
b482cd20	157	}
7aecf494 SB	158	p = NULL;
7aecf494 SB	159	out:
7aecf494	160	return p;
b482cd20 SB	161	}
	162
	163	struct cfctrl_rsp cfctrl_get_respfuncs(struct cflayer layer)
	164	{
	165	struct cfctrl *this = container_obj(layer);
	166	return &this->res;
	167	}
	168
b482cd20 SB	169	static void init_info(struct caif_payload_info info, struct cfctrl cfctrl)
	170	{
	171	info->hdr_len = 0;
	172	info->channel_id = cfctrl->serv.layer.id;
	173	info->dev_info = &cfctrl->serv.dev_info;
	174	}
	175
	176	void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
	177	{
f315fd35	178	struct cfpkt *pkt;
b482cd20	179	struct cfctrl *cfctrl = container_obj(layer);
0e5a1174	180	struct cflayer *dn = cfctrl->serv.layer.dn;
f315fd35	181
0e5a1174	182	if (!dn) {
	183	pr_debug("not able to send enum request\n");
	184	return;
	185	}
f315fd35 KLX	186	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	187	if (!pkt)
	188	return;
b482cd20 SB	189	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	190	init_info(cfpkt_info(pkt), cfctrl);
	191	cfpkt_info(pkt)->dev_info->id = physlinkid;
	192	cfctrl->serv.dev_info.id = physlinkid;
	193	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
	194	cfpkt_addbdy(pkt, physlinkid);
44764812	195	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
0e5a1174	196	dn->transmit(dn, pkt);
b482cd20 SB	197	}
b482cd20 SB	198
8d545c8f	199	int cfctrl_linkup_request(struct cflayer *layer,
3bffc475 SMP	200	struct cfctrl_link_param *param,
3bffc475 SMP	201	struct cflayer *user_layer)
b482cd20 SB	202	{
	203	struct cfctrl *cfctrl = container_obj(layer);
	204	u32 tmp32;
	205	u16 tmp16;
	206	u8 tmp8;
	207	struct cfctrl_request_info *req;
	208	int ret;
	209	char utility_name[16];
c85c2951	210	struct cfpkt *pkt;
0e5a1174	211	struct cflayer *dn = cfctrl->serv.layer.dn;
	212
	213	if (!dn) {
	214	pr_debug("not able to send linkup request\n");
	215	return -ENODEV;
	216	}
c85c2951	217
	218	if (cfctrl_cancel_req(layer, user_layer) > 0) {
	219	/* Slight Paranoia, check if already connecting */
	220	pr_err("Duplicate connect request for same client\n");
	221	WARN_ON(1);
	222	return -EALREADY;
	223	}
	224
	225	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
7ac2ed0c	226	if (!pkt)
8d545c8f	227	return -ENOMEM;
b482cd20	228	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
c85c2951	229	cfpkt_addbdy(pkt, (param->chtype << 4) \| param->linktype);
c85c2951	230	cfpkt_addbdy(pkt, (param->priority << 3) \| param->phyid);
b482cd20 SB	231	cfpkt_addbdy(pkt, param->endpoint & 0x03);
	232
	233	switch (param->linktype) {
	234	case CFCTRL_SRV_VEI:
	235	break;
	236	case CFCTRL_SRV_VIDEO:
	237	cfpkt_addbdy(pkt, (u8) param->u.video.connid);
	238	break;
	239	case CFCTRL_SRV_DBG:
	240	break;
	241	case CFCTRL_SRV_DATAGRAM:
	242	tmp32 = cpu_to_le32(param->u.datagram.connid);
	243	cfpkt_add_body(pkt, &tmp32, 4);
	244	break;
	245	case CFCTRL_SRV_RFM:
	246	/* Construct a frame, convert DatagramConnectionID to network
	247	* format long and copy it out...
	248	*/
	249	tmp32 = cpu_to_le32(param->u.rfm.connid);
	250	cfpkt_add_body(pkt, &tmp32, 4);
	251	/* Add volume name, including zero termination... */
	252	cfpkt_add_body(pkt, param->u.rfm.volume,
	253	strlen(param->u.rfm.volume) + 1);
	254	break;
	255	case CFCTRL_SRV_UTIL:
	256	tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
	257	cfpkt_add_body(pkt, &tmp16, 2);
	258	tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
	259	cfpkt_add_body(pkt, &tmp16, 2);
	260	memset(utility_name, 0, sizeof(utility_name));
	261	strncpy(utility_name, param->u.utility.name,
	262	UTILITY_NAME_LENGTH - 1);
	263	cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
	264	tmp8 = param->u.utility.paramlen;
	265	cfpkt_add_body(pkt, &tmp8, 1);
	266	cfpkt_add_body(pkt, param->u.utility.params,
	267	param->u.utility.paramlen);
	268	break;
	269	default:
b31fa5ba JP	270	pr_warn("Request setup of bad link type = %d\n",
b31fa5ba JP	271	param->linktype);
8d545c8f	272	return -EINVAL;
b482cd20	273	}
49afa55b	274	req = kzalloc(sizeof(*req), GFP_KERNEL);
7ac2ed0c	275	if (!req)
8d545c8f	276	return -ENOMEM;
b482cd20 SB	277	req->client_layer = user_layer;
	278	req->cmd = CFCTRL_CMD_LINK_SETUP;
	279	req->param = *param;
	280	cfctrl_insert_req(cfctrl, req);
	281	init_info(cfpkt_info(pkt), cfctrl);
8d545c8f SB	282	/*
	283	* NOTE:Always send linkup and linkdown request on the same
	284	* device as the payload. Otherwise old queued up payload
	285	* might arrive with the newly allocated channel ID.
	286	*/
b482cd20	287	cfpkt_info(pkt)->dev_info->id = param->phyid;
44764812	288	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
b482cd20	289	ret =
0e5a1174	290	dn->transmit(dn, pkt);
b482cd20	291	if (ret < 0) {
c85c2951	292	int count;
	293
	294	count = cfctrl_cancel_req(&cfctrl->serv.layer,
	295	user_layer);
	296	if (count != 1)
	297	pr_err("Could not remove request (%d)", count);
	298	return -ENODEV;
b482cd20	299	}
8d545c8f	300	return 0;
b482cd20 SB	301	}
	302
	303	int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
3bffc475	304	struct cflayer *client)
b482cd20 SB	305	{
b482cd20 SB	306	int ret;
f315fd35	307	struct cfpkt *pkt;
b482cd20	308	struct cfctrl *cfctrl = container_obj(layer);
0e5a1174	309	struct cflayer *dn = cfctrl->serv.layer.dn;
0e5a1174	310
0e5a1174	311	if (!dn) {
	312	pr_debug("not able to send link-down request\n");
	313	return -ENODEV;
	314	}
f315fd35 KLX	315	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	316	if (!pkt)
	317	return -ENOMEM;
b482cd20 SB	318	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	319	cfpkt_addbdy(pkt, channelid);
	320	init_info(cfpkt_info(pkt), cfctrl);
44764812	321	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
b482cd20	322	ret =
0e5a1174	323	dn->transmit(dn, pkt);
c85c2951	324	#ifndef CAIF_NO_LOOP
	325	cfctrl->loop_linkused[channelid] = 0;
	326	#endif
b482cd20 SB	327	return ret;
	328	}
	329
c85c2951	330	int cfctrl_cancel_req(struct cflayer layr, struct cflayer adap_layer)
8d545c8f	331	{
7aecf494	332	struct cfctrl_request_info p, tmp;
8d545c8f	333	struct cfctrl *ctrl = container_obj(layr);
c85c2951	334	int found = 0;
c85c2951	335	spin_lock_bh(&ctrl->info_list_lock);
7aecf494 SB	336
	337	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	338	if (p->client_layer == adap_layer) {
7aecf494 SB	339	list_del(&p->list);
7aecf494 SB	340	kfree(p);
c85c2951	341	found++;
8d545c8f	342	}
8d545c8f SB	343	}
8d545c8f SB	344
c85c2951	345	spin_unlock_bh(&ctrl->info_list_lock);
c85c2951	346	return found;
8d545c8f SB	347	}
8d545c8f SB	348
b482cd20 SB	349	static int cfctrl_recv(struct cflayer layer, struct cfpkt pkt)
	350	{
	351	u8 cmdrsp;
	352	u8 cmd;
	353	int ret = -1;
	354	u16 tmp16;
	355	u8 len;
	356	u8 param[255];
	357	u8 linkid;
	358	struct cfctrl *cfctrl = container_obj(layer);
	359	struct cfctrl_request_info rsp, *req;
	360
	361
	362	cfpkt_extr_head(pkt, &cmdrsp, 1);
	363	cmd = cmdrsp & CFCTRL_CMD_MASK;
	364	if (cmd != CFCTRL_CMD_LINK_ERR
96796ea8	365	&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
96796ea8	366	&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
2aa40aef	367	if (handle_loop(cfctrl, cmd, pkt) != 0)
8d545c8f	368	cmdrsp \|= CFCTRL_ERR_BIT;
b482cd20 SB	369	}
	370
	371	switch (cmd) {
	372	case CFCTRL_CMD_LINK_SETUP:
	373	{
	374	enum cfctrl_srv serv;
	375	enum cfctrl_srv servtype;
	376	u8 endpoint;
	377	u8 physlinkid;
	378	u8 prio;
	379	u8 tmp;
	380	u32 tmp32;
	381	u8 *cp;
	382	int i;
	383	struct cfctrl_link_param linkparam;
	384	memset(&linkparam, 0, sizeof(linkparam));
	385
	386	cfpkt_extr_head(pkt, &tmp, 1);
	387
	388	serv = tmp & CFCTRL_SRV_MASK;
	389	linkparam.linktype = serv;
	390
	391	servtype = tmp >> 4;
	392	linkparam.chtype = servtype;
	393
	394	cfpkt_extr_head(pkt, &tmp, 1);
	395	physlinkid = tmp & 0x07;
	396	prio = tmp >> 3;
	397
	398	linkparam.priority = prio;
	399	linkparam.phyid = physlinkid;
	400	cfpkt_extr_head(pkt, &endpoint, 1);
	401	linkparam.endpoint = endpoint & 0x03;
	402
	403	switch (serv) {
	404	case CFCTRL_SRV_VEI:
	405	case CFCTRL_SRV_DBG:
8d545c8f SB	406	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	407	break;
b482cd20 SB	408	/* Link ID */
	409	cfpkt_extr_head(pkt, &linkid, 1);
	410	break;
	411	case CFCTRL_SRV_VIDEO:
	412	cfpkt_extr_head(pkt, &tmp, 1);
	413	linkparam.u.video.connid = tmp;
8d545c8f SB	414	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	415	break;
b482cd20 SB	416	/* Link ID */
	417	cfpkt_extr_head(pkt, &linkid, 1);
	418	break;
	419
	420	case CFCTRL_SRV_DATAGRAM:
	421	cfpkt_extr_head(pkt, &tmp32, 4);
	422	linkparam.u.datagram.connid =
	423	le32_to_cpu(tmp32);
8d545c8f SB	424	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	425	break;
b482cd20 SB	426	/* Link ID */
	427	cfpkt_extr_head(pkt, &linkid, 1);
	428	break;
	429	case CFCTRL_SRV_RFM:
	430	/* Construct a frame, convert
	431	* DatagramConnectionID
	432	* to network format long and copy it out...
	433	*/
	434	cfpkt_extr_head(pkt, &tmp32, 4);
	435	linkparam.u.rfm.connid =
	436	le32_to_cpu(tmp32);
	437	cp = (u8 *) linkparam.u.rfm.volume;
	438	for (cfpkt_extr_head(pkt, &tmp, 1);
	439	cfpkt_more(pkt) && tmp != '\0';
	440	cfpkt_extr_head(pkt, &tmp, 1))
	441	*cp++ = tmp;
	442	*cp = '\0';
	443
8d545c8f SB	444	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	445	break;
b482cd20 SB	446	/* Link ID */
	447	cfpkt_extr_head(pkt, &linkid, 1);
	448
	449	break;
	450	case CFCTRL_SRV_UTIL:
	451	/* Construct a frame, convert
	452	* DatagramConnectionID
	453	* to network format long and copy it out...
	454	*/
	455	/* Fifosize KB */
	456	cfpkt_extr_head(pkt, &tmp16, 2);
	457	linkparam.u.utility.fifosize_kb =
	458	le16_to_cpu(tmp16);
	459	/* Fifosize bufs */
	460	cfpkt_extr_head(pkt, &tmp16, 2);
	461	linkparam.u.utility.fifosize_bufs =
	462	le16_to_cpu(tmp16);
	463	/* name */
	464	cp = (u8 *) linkparam.u.utility.name;
	465	caif_assert(sizeof(linkparam.u.utility.name)
	466	>= UTILITY_NAME_LENGTH);
	467	for (i = 0;
	468	i < UTILITY_NAME_LENGTH
	469	&& cfpkt_more(pkt); i++) {
	470	cfpkt_extr_head(pkt, &tmp, 1);
	471	*cp++ = tmp;
	472	}
	473	/* Length */
	474	cfpkt_extr_head(pkt, &len, 1);
	475	linkparam.u.utility.paramlen = len;
	476	/* Param Data */
	477	cp = linkparam.u.utility.params;
	478	while (cfpkt_more(pkt) && len--) {
	479	cfpkt_extr_head(pkt, &tmp, 1);
	480	*cp++ = tmp;
	481	}
8d545c8f SB	482	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	483	break;
b482cd20 SB	484	/* Link ID */
	485	cfpkt_extr_head(pkt, &linkid, 1);
	486	/* Length */
	487	cfpkt_extr_head(pkt, &len, 1);
	488	/* Param Data */
	489	cfpkt_extr_head(pkt, &param, len);
	490	break;
	491	default:
0e5a1174	492	pr_warn("Request setup, invalid type (%d)\n",
b31fa5ba	493	serv);
b482cd20 SB	494	goto error;
	495	}
	496
	497	rsp.cmd = cmd;
	498	rsp.param = linkparam;
c85c2951	499	spin_lock_bh(&cfctrl->info_list_lock);
b482cd20 SB	500	req = cfctrl_remove_req(cfctrl, &rsp);
	501
	502	if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) \|\|
	503	cfpkt_erroneous(pkt)) {
0e5a1174	504	pr_err("Invalid O/E bit or parse error "
0e5a1174	505	"on CAIF control channel\n");
b482cd20 SB	506	cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
	507	0,
	508	req ? req->client_layer
	509	: NULL);
	510	} else {
	511	cfctrl->res.linksetup_rsp(cfctrl->serv.
	512	layer.up, linkid,
	513	serv, physlinkid,
	514	req ? req->
	515	client_layer : NULL);
	516	}
	517
973b1b9a	518	kfree(req);
c85c2951	519
c85c2951	520	spin_unlock_bh(&cfctrl->info_list_lock);
b482cd20 SB	521	}
	522	break;
	523	case CFCTRL_CMD_LINK_DESTROY:
	524	cfpkt_extr_head(pkt, &linkid, 1);
8d545c8f	525	cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
b482cd20 SB	526	break;
b482cd20 SB	527	case CFCTRL_CMD_LINK_ERR:
b31fa5ba	528	pr_err("Frame Error Indication received\n");
b482cd20 SB	529	cfctrl->res.linkerror_ind();
	530	break;
	531	case CFCTRL_CMD_ENUM:
	532	cfctrl->res.enum_rsp();
	533	break;
	534	case CFCTRL_CMD_SLEEP:
	535	cfctrl->res.sleep_rsp();
	536	break;
	537	case CFCTRL_CMD_WAKE:
	538	cfctrl->res.wake_rsp();
	539	break;
	540	case CFCTRL_CMD_LINK_RECONF:
	541	cfctrl->res.restart_rsp();
	542	break;
	543	case CFCTRL_CMD_RADIO_SET:
	544	cfctrl->res.radioset_rsp();
	545	break;
	546	default:
b31fa5ba	547	pr_err("Unrecognized Control Frame\n");
b482cd20 SB	548	goto error;
	549	break;
	550	}
	551	ret = 0;
	552	error:
	553	cfpkt_destroy(pkt);
	554	return ret;
	555	}
	556
	557	static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
3bffc475	558	int phyid)
b482cd20 SB	559	{
	560	struct cfctrl *this = container_obj(layr);
	561	switch (ctrl) {
	562	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
	563	case CAIF_CTRLCMD_FLOW_OFF_IND:
c85c2951	564	spin_lock_bh(&this->info_list_lock);
0e5a1174	565	if (!list_empty(&this->list))
b31fa5ba	566	pr_debug("Received flow off in control layer\n");
c85c2951	567	spin_unlock_bh(&this->info_list_lock);
b482cd20	568	break;
c85c2951	569	case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
	570	struct cfctrl_request_info p, tmp;
	571
	572	/* Find all connect request and report failure */
	573	spin_lock_bh(&this->info_list_lock);
	574	list_for_each_entry_safe(p, tmp, &this->list, list) {
	575	if (p->param.phyid == phyid) {
	576	list_del(&p->list);
	577	p->client_layer->ctrlcmd(p->client_layer,
	578	CAIF_CTRLCMD_INIT_FAIL_RSP,
	579	phyid);
	580	kfree(p);
	581	}
	582	}
	583	spin_unlock_bh(&this->info_list_lock);
	584	break;
	585	}
b482cd20 SB	586	default:
	587	break;
	588	}
	589	}
	590
	591	#ifndef CAIF_NO_LOOP
	592	static int handle_loop(struct cfctrl ctrl, int cmd, struct cfpkt pkt)
	593	{
	594	static int last_linkid;
c85c2951	595	static int dec;
b482cd20 SB	596	u8 linkid, linktype, tmp;
	597	switch (cmd) {
	598	case CFCTRL_CMD_LINK_SETUP:
c85c2951	599	spin_lock_bh(&ctrl->loop_linkid_lock);
c85c2951	600	if (!dec) {
96796ea8	601	for (linkid = last_linkid + 1; linkid < 254; linkid++)
c85c2951	602	if (!ctrl->loop_linkused[linkid])
	603	goto found;
	604	}
	605	dec = 1;
96796ea8	606	for (linkid = last_linkid - 1; linkid > 1; linkid--)
b482cd20 SB	607	if (!ctrl->loop_linkused[linkid])
b482cd20 SB	608	goto found;
c85c2951	609	spin_unlock_bh(&ctrl->loop_linkid_lock);
96796ea8	610	return -1;
b482cd20	611	found:
c85c2951	612	if (linkid < 10)
	613	dec = 0;
	614
b482cd20 SB	615	if (!ctrl->loop_linkused[linkid])
	616	ctrl->loop_linkused[linkid] = 1;
	617
	618	last_linkid = linkid;
	619
	620	cfpkt_add_trail(pkt, &linkid, 1);
c85c2951	621	spin_unlock_bh(&ctrl->loop_linkid_lock);
b482cd20 SB	622	cfpkt_peek_head(pkt, &linktype, 1);
	623	if (linktype == CFCTRL_SRV_UTIL) {
	624	tmp = 0x01;
	625	cfpkt_add_trail(pkt, &tmp, 1);
	626	cfpkt_add_trail(pkt, &tmp, 1);
	627	}
	628	break;
	629
	630	case CFCTRL_CMD_LINK_DESTROY:
c85c2951	631	spin_lock_bh(&ctrl->loop_linkid_lock);
b482cd20 SB	632	cfpkt_peek_head(pkt, &linkid, 1);
b482cd20 SB	633	ctrl->loop_linkused[linkid] = 0;
c85c2951	634	spin_unlock_bh(&ctrl->loop_linkid_lock);
b482cd20 SB	635	break;
	636	default:
	637	break;
	638	}
2aa40aef	639	return 0;
b482cd20 SB	640	}
b482cd20 SB	641	#endif