[net-next-2.6.git] / net / caif / cfctrl.c

/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
 * 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 <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 =
		kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	if (!this) {
		pr_warn("Out of memory\n");
		return NULL;
	}
	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	memset(&dev_info, 0, sizeof(dev_info));
	dev_info.id = 0xff;
	memset(this, 0, sizeof(*this));
	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;
	spin_lock_init(&this->loop_linkid_lock);
	spin_lock_init(&this->info_list_lock);
	INIT_LIST_HEAD(&this->list);
	this->loop_linkid = 1;
	return &this->serv.layer;
}

static bool param_eq(struct cfctrl_link_param *p1, 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;
}

bool cfctrl_req_eq(struct cfctrl_request_info *r1,
		   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 */
void cfctrl_insert_req(struct cfctrl *ctrl,
			      struct cfctrl_request_info *req)
{
	spin_lock(&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(&ctrl->info_list_lock);
}

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

	spin_lock(&ctrl->info_list_lock);
	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:
	spin_unlock(&ctrl->info_list_lock);
	return p;
}

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

void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
{
	this->dn = dn;
}

void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
{
	this->up = up;
}

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 cfctrl *cfctrl = container_obj(layer);
	int ret;
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		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);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0) {
		pr_err("Could not transmit enum message\n");
		cfpkt_destroy(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 = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		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) {
		pr_warn("Out of memory\n");
		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;
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0) {
		pr_err("Could not transmit linksetup request\n");
		cfpkt_destroy(pkt);
		return -ENODEV;
	}
	return 0;
}

int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
				struct cflayer *client)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		return -ENOMEM;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	cfpkt_addbdy(pkt, channelid);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0) {
		pr_err("Could not transmit link-down request\n");
		cfpkt_destroy(pkt);
	}
	return ret;
}

void cfctrl_sleep_req(struct cflayer *layer)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		return;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0)
		cfpkt_destroy(pkt);
}

void cfctrl_wake_req(struct cflayer *layer)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		return;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0)
		cfpkt_destroy(pkt);
}

void cfctrl_getstartreason_req(struct cflayer *layer)
{
	int ret;
	struct cfctrl *cfctrl = container_obj(layer);
	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	if (!pkt) {
		pr_warn("Out of memory\n");
		return;
	}
	cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
	init_info(cfpkt_info(pkt), cfctrl);
	ret =
	    cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	if (ret < 0)
		cfpkt_destroy(pkt);
}


void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
{
	struct cfctrl_request_info *p, *tmp;
	struct cfctrl *ctrl = container_obj(layr);
	spin_lock(&ctrl->info_list_lock);

	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
		if (p->client_layer == adap_layer) {
			pr_debug("cancel req :%d\n", p->sequence_no);
			list_del(&p->list);
			kfree(p);
		}
	}

	spin_unlock(&ctrl->info_list_lock);
}

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)) {
		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 link type (%d)\n",
					serv);
				goto error;
			}

			rsp.cmd = cmd;
			rsp.param = linkparam;
			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);
			}

			if (req != NULL)
				kfree(req);
		}
		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(&this->info_list_lock);
		if (!list_empty(&this->list)) {
			pr_debug("Received flow off in control layer\n");
		}
		spin_unlock(&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;
	u8 linkid, linktype, tmp;
	switch (cmd) {
	case CFCTRL_CMD_LINK_SETUP:
		spin_lock(&ctrl->loop_linkid_lock);
		for (linkid = last_linkid + 1; linkid < 255; linkid++)
			if (!ctrl->loop_linkused[linkid])
				goto found;
		for (linkid = last_linkid - 1; linkid > 0; linkid--)
			if (!ctrl->loop_linkused[linkid])
				goto found;
		spin_unlock(&ctrl->loop_linkid_lock);
		pr_err("Out of link-ids\n");
		return -EINVAL;
found:
		if (!ctrl->loop_linkused[linkid])
			ctrl->loop_linkused[linkid] = 1;

		last_linkid = linkid;

		cfpkt_add_trail(pkt, &linkid, 1);
		spin_unlock(&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(&ctrl->loop_linkid_lock);
		cfpkt_peek_head(pkt, &linkid, 1);
		ctrl->loop_linkused[linkid] = 0;
		spin_unlock(&ctrl->loop_linkid_lock);
		break;
	default:
		break;
	}
	return 0;
}
#endif
Commit	Line	Data
b482cd20 SB	1	/*
	2	* Copyright (C) ST-Ericsson AB 2010
	3	* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
	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>
	12	#include <net/caif/caif_layer.h>
	13	#include <net/caif/cfpkt.h>
	14	#include <net/caif/cfctrl.h>
	15
	16	#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
	17	#define UTILITY_NAME_LENGTH 16
	18	#define CFPKT_CTRL_PKT_LEN 20
	19
	20
	21	#ifdef CAIF_NO_LOOP
	22	static int handle_loop(struct cfctrl *ctrl,
	23	int cmd, struct cfpkt *pkt){
2aa40aef	24	return -1;
b482cd20 SB	25	}
	26	#else
	27	static int handle_loop(struct cfctrl *ctrl,
	28	int cmd, struct cfpkt *pkt);
	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 SB	38	struct cfctrl *this =
	39	kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	40	if (!this) {
b31fa5ba	41	pr_warn("Out of memory\n");
b482cd20 SB	42	return NULL;
	43	}
	44	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
8d545c8f SB	45	memset(&dev_info, 0, sizeof(dev_info));
8d545c8f SB	46	dev_info.id = 0xff;
b482cd20	47	memset(this, 0, sizeof(*this));
b1c74247	48	cfsrvl_init(&this->serv, 0, &dev_info, false);
b482cd20 SB	49	atomic_set(&this->req_seq_no, 1);
b482cd20 SB	50	atomic_set(&this->rsp_seq_no, 1);
b482cd20 SB	51	this->serv.layer.receive = cfctrl_recv;
	52	sprintf(this->serv.layer.name, "ctrl");
	53	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
	54	spin_lock_init(&this->loop_linkid_lock);
7aecf494 SB	55	spin_lock_init(&this->info_list_lock);
7aecf494 SB	56	INIT_LIST_HEAD(&this->list);
b482cd20 SB	57	this->loop_linkid = 1;
	58	return &this->serv.layer;
	59	}
	60
	61	static bool param_eq(struct cfctrl_link_param p1, struct cfctrl_link_param p2)
	62	{
	63	bool eq =
	64	p1->linktype == p2->linktype &&
	65	p1->priority == p2->priority &&
	66	p1->phyid == p2->phyid &&
	67	p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
	68
	69	if (!eq)
	70	return false;
	71
	72	switch (p1->linktype) {
	73	case CFCTRL_SRV_VEI:
	74	return true;
	75	case CFCTRL_SRV_DATAGRAM:
	76	return p1->u.datagram.connid == p2->u.datagram.connid;
	77	case CFCTRL_SRV_RFM:
	78	return
	79	p1->u.rfm.connid == p2->u.rfm.connid &&
	80	strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
	81	case CFCTRL_SRV_UTIL:
	82	return
	83	p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
	84	&& p1->u.utility.fifosize_bufs ==
	85	p2->u.utility.fifosize_bufs
	86	&& strcmp(p1->u.utility.name, p2->u.utility.name) == 0
	87	&& p1->u.utility.paramlen == p2->u.utility.paramlen
	88	&& memcmp(p1->u.utility.params, p2->u.utility.params,
	89	p1->u.utility.paramlen) == 0;
	90
	91	case CFCTRL_SRV_VIDEO:
	92	return p1->u.video.connid == p2->u.video.connid;
	93	case CFCTRL_SRV_DBG:
	94	return true;
	95	case CFCTRL_SRV_DECM:
	96	return false;
	97	default:
	98	return false;
	99	}
	100	return false;
	101	}
	102
	103	bool cfctrl_req_eq(struct cfctrl_request_info *r1,
	104	struct cfctrl_request_info *r2)
	105	{
	106	if (r1->cmd != r2->cmd)
	107	return false;
	108	if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
	109	return param_eq(&r1->param, &r2->param);
	110	else
	111	return r1->channel_id == r2->channel_id;
	112	}
	113
	114	/* Insert request at the end */
	115	void cfctrl_insert_req(struct cfctrl *ctrl,
	116	struct cfctrl_request_info *req)
	117	{
b482cd20	118	spin_lock(&ctrl->info_list_lock);
b482cd20 SB	119	atomic_inc(&ctrl->req_seq_no);
b482cd20 SB	120	req->sequence_no = atomic_read(&ctrl->req_seq_no);
7aecf494	121	list_add_tail(&req->list, &ctrl->list);
b482cd20 SB	122	spin_unlock(&ctrl->info_list_lock);
	123	}
	124
b482cd20 SB	125	/* Compare and remove request */
	126	struct cfctrl_request_info cfctrl_remove_req(struct cfctrl ctrl,
	127	struct cfctrl_request_info *req)
	128	{
7aecf494	129	struct cfctrl_request_info p, tmp, *first;
b482cd20 SB	130
b482cd20 SB	131	spin_lock(&ctrl->info_list_lock);
7aecf494	132	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
b482cd20	133
7aecf494 SB	134	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	135	if (cfctrl_req_eq(req, p)) {
	136	if (p != first)
b31fa5ba	137	pr_warn("Requests are not received in order\n");
7aecf494	138
b482cd20	139	atomic_set(&ctrl->rsp_seq_no,
7aecf494 SB	140	p->sequence_no);
	141	list_del(&p->list);
	142	goto out;
b482cd20	143	}
b482cd20	144	}
7aecf494 SB	145	p = NULL;
7aecf494 SB	146	out:
b482cd20	147	spin_unlock(&ctrl->info_list_lock);
7aecf494	148	return p;
b482cd20 SB	149	}
	150
	151	struct cfctrl_rsp cfctrl_get_respfuncs(struct cflayer layer)
	152	{
	153	struct cfctrl *this = container_obj(layer);
	154	return &this->res;
	155	}
	156
	157	void cfctrl_set_dnlayer(struct cflayer this, struct cflayer dn)
	158	{
	159	this->dn = dn;
	160	}
	161
	162	void cfctrl_set_uplayer(struct cflayer this, struct cflayer up)
	163	{
	164	this->up = up;
	165	}
	166
	167	static void init_info(struct caif_payload_info info, struct cfctrl cfctrl)
	168	{
	169	info->hdr_len = 0;
	170	info->channel_id = cfctrl->serv.layer.id;
	171	info->dev_info = &cfctrl->serv.dev_info;
	172	}
	173
	174	void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
	175	{
	176	struct cfctrl *cfctrl = container_obj(layer);
	177	int ret;
	178	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	179	if (!pkt) {
b31fa5ba	180	pr_warn("Out of memory\n");
b482cd20 SB	181	return;
	182	}
	183	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	184	init_info(cfpkt_info(pkt), cfctrl);
	185	cfpkt_info(pkt)->dev_info->id = physlinkid;
	186	cfctrl->serv.dev_info.id = physlinkid;
	187	cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
	188	cfpkt_addbdy(pkt, physlinkid);
	189	ret =
	190	cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	191	if (ret < 0) {
b31fa5ba	192	pr_err("Could not transmit enum message\n");
b482cd20 SB	193	cfpkt_destroy(pkt);
	194	}
	195	}
	196
8d545c8f	197	int cfctrl_linkup_request(struct cflayer *layer,
b482cd20 SB	198	struct cfctrl_link_param *param,
	199	struct cflayer *user_layer)
	200	{
	201	struct cfctrl *cfctrl = container_obj(layer);
	202	u32 tmp32;
	203	u16 tmp16;
	204	u8 tmp8;
	205	struct cfctrl_request_info *req;
	206	int ret;
	207	char utility_name[16];
	208	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	209	if (!pkt) {
b31fa5ba	210	pr_warn("Out of memory\n");
8d545c8f	211	return -ENOMEM;
b482cd20 SB	212	}
	213	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
	214	cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
	215	cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
	216	cfpkt_addbdy(pkt, param->endpoint & 0x03);
	217
	218	switch (param->linktype) {
	219	case CFCTRL_SRV_VEI:
	220	break;
	221	case CFCTRL_SRV_VIDEO:
	222	cfpkt_addbdy(pkt, (u8) param->u.video.connid);
	223	break;
	224	case CFCTRL_SRV_DBG:
	225	break;
	226	case CFCTRL_SRV_DATAGRAM:
	227	tmp32 = cpu_to_le32(param->u.datagram.connid);
	228	cfpkt_add_body(pkt, &tmp32, 4);
	229	break;
	230	case CFCTRL_SRV_RFM:
	231	/* Construct a frame, convert DatagramConnectionID to network
	232	* format long and copy it out...
	233	*/
	234	tmp32 = cpu_to_le32(param->u.rfm.connid);
	235	cfpkt_add_body(pkt, &tmp32, 4);
	236	/* Add volume name, including zero termination... */
	237	cfpkt_add_body(pkt, param->u.rfm.volume,
	238	strlen(param->u.rfm.volume) + 1);
	239	break;
	240	case CFCTRL_SRV_UTIL:
	241	tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
	242	cfpkt_add_body(pkt, &tmp16, 2);
	243	tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
	244	cfpkt_add_body(pkt, &tmp16, 2);
	245	memset(utility_name, 0, sizeof(utility_name));
	246	strncpy(utility_name, param->u.utility.name,
	247	UTILITY_NAME_LENGTH - 1);
	248	cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
	249	tmp8 = param->u.utility.paramlen;
	250	cfpkt_add_body(pkt, &tmp8, 1);
	251	cfpkt_add_body(pkt, param->u.utility.params,
	252	param->u.utility.paramlen);
	253	break;
	254	default:
b31fa5ba JP	255	pr_warn("Request setup of bad link type = %d\n",
b31fa5ba JP	256	param->linktype);
8d545c8f	257	return -EINVAL;
b482cd20	258	}
49afa55b	259	req = kzalloc(sizeof(*req), GFP_KERNEL);
b482cd20	260	if (!req) {
b31fa5ba	261	pr_warn("Out of memory\n");
8d545c8f	262	return -ENOMEM;
b482cd20	263	}
b482cd20 SB	264	req->client_layer = user_layer;
	265	req->cmd = CFCTRL_CMD_LINK_SETUP;
	266	req->param = *param;
	267	cfctrl_insert_req(cfctrl, req);
	268	init_info(cfpkt_info(pkt), cfctrl);
8d545c8f SB	269	/*
	270	* NOTE:Always send linkup and linkdown request on the same
	271	* device as the payload. Otherwise old queued up payload
	272	* might arrive with the newly allocated channel ID.
	273	*/
b482cd20 SB	274	cfpkt_info(pkt)->dev_info->id = param->phyid;
	275	ret =
	276	cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	277	if (ret < 0) {
b31fa5ba	278	pr_err("Could not transmit linksetup request\n");
b482cd20	279	cfpkt_destroy(pkt);
8d545c8f	280	return -ENODEV;
b482cd20	281	}
8d545c8f	282	return 0;
b482cd20 SB	283	}
	284
	285	int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
	286	struct cflayer *client)
	287	{
	288	int ret;
	289	struct cfctrl *cfctrl = container_obj(layer);
	290	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	291	if (!pkt) {
b31fa5ba	292	pr_warn("Out of memory\n");
b482cd20 SB	293	return -ENOMEM;
b482cd20 SB	294	}
b482cd20 SB	295	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	296	cfpkt_addbdy(pkt, channelid);
	297	init_info(cfpkt_info(pkt), cfctrl);
	298	ret =
	299	cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	300	if (ret < 0) {
b31fa5ba	301	pr_err("Could not transmit link-down request\n");
b482cd20 SB	302	cfpkt_destroy(pkt);
	303	}
	304	return ret;
	305	}
	306
	307	void cfctrl_sleep_req(struct cflayer *layer)
	308	{
	309	int ret;
	310	struct cfctrl *cfctrl = container_obj(layer);
	311	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	312	if (!pkt) {
b31fa5ba	313	pr_warn("Out of memory\n");
b482cd20 SB	314	return;
	315	}
	316	cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
	317	init_info(cfpkt_info(pkt), cfctrl);
	318	ret =
	319	cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	320	if (ret < 0)
	321	cfpkt_destroy(pkt);
	322	}
	323
	324	void cfctrl_wake_req(struct cflayer *layer)
	325	{
	326	int ret;
	327	struct cfctrl *cfctrl = container_obj(layer);
	328	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	329	if (!pkt) {
b31fa5ba	330	pr_warn("Out of memory\n");
b482cd20 SB	331	return;
	332	}
	333	cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
	334	init_info(cfpkt_info(pkt), cfctrl);
	335	ret =
	336	cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	337	if (ret < 0)
	338	cfpkt_destroy(pkt);
	339	}
	340
	341	void cfctrl_getstartreason_req(struct cflayer *layer)
	342	{
	343	int ret;
	344	struct cfctrl *cfctrl = container_obj(layer);
	345	struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	346	if (!pkt) {
b31fa5ba	347	pr_warn("Out of memory\n");
b482cd20 SB	348	return;
	349	}
	350	cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
	351	init_info(cfpkt_info(pkt), cfctrl);
	352	ret =
	353	cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
	354	if (ret < 0)
	355	cfpkt_destroy(pkt);
	356	}
	357
	358
8d545c8f SB	359	void cfctrl_cancel_req(struct cflayer layr, struct cflayer adap_layer)
8d545c8f SB	360	{
7aecf494	361	struct cfctrl_request_info p, tmp;
8d545c8f SB	362	struct cfctrl *ctrl = container_obj(layr);
8d545c8f SB	363	spin_lock(&ctrl->info_list_lock);
7aecf494 SB	364
	365	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	366	if (p->client_layer == adap_layer) {
47d1ff17	367	pr_debug("cancel req :%d\n", p->sequence_no);
7aecf494 SB	368	list_del(&p->list);
7aecf494 SB	369	kfree(p);
8d545c8f	370	}
8d545c8f SB	371	}
	372
	373	spin_unlock(&ctrl->info_list_lock);
	374	}
	375
b482cd20 SB	376	static int cfctrl_recv(struct cflayer layer, struct cfpkt pkt)
	377	{
	378	u8 cmdrsp;
	379	u8 cmd;
	380	int ret = -1;
	381	u16 tmp16;
	382	u8 len;
	383	u8 param[255];
	384	u8 linkid;
	385	struct cfctrl *cfctrl = container_obj(layer);
	386	struct cfctrl_request_info rsp, *req;
	387
	388
	389	cfpkt_extr_head(pkt, &cmdrsp, 1);
	390	cmd = cmdrsp & CFCTRL_CMD_MASK;
	391	if (cmd != CFCTRL_CMD_LINK_ERR
	392	&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
2aa40aef	393	if (handle_loop(cfctrl, cmd, pkt) != 0)
8d545c8f	394	cmdrsp \|= CFCTRL_ERR_BIT;
b482cd20 SB	395	}
	396
	397	switch (cmd) {
	398	case CFCTRL_CMD_LINK_SETUP:
	399	{
	400	enum cfctrl_srv serv;
	401	enum cfctrl_srv servtype;
	402	u8 endpoint;
	403	u8 physlinkid;
	404	u8 prio;
	405	u8 tmp;
	406	u32 tmp32;
	407	u8 *cp;
	408	int i;
	409	struct cfctrl_link_param linkparam;
	410	memset(&linkparam, 0, sizeof(linkparam));
	411
	412	cfpkt_extr_head(pkt, &tmp, 1);
	413
	414	serv = tmp & CFCTRL_SRV_MASK;
	415	linkparam.linktype = serv;
	416
	417	servtype = tmp >> 4;
	418	linkparam.chtype = servtype;
	419
	420	cfpkt_extr_head(pkt, &tmp, 1);
	421	physlinkid = tmp & 0x07;
	422	prio = tmp >> 3;
	423
	424	linkparam.priority = prio;
	425	linkparam.phyid = physlinkid;
	426	cfpkt_extr_head(pkt, &endpoint, 1);
	427	linkparam.endpoint = endpoint & 0x03;
	428
	429	switch (serv) {
	430	case CFCTRL_SRV_VEI:
	431	case CFCTRL_SRV_DBG:
8d545c8f SB	432	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	433	break;
b482cd20 SB	434	/* Link ID */
	435	cfpkt_extr_head(pkt, &linkid, 1);
	436	break;
	437	case CFCTRL_SRV_VIDEO:
	438	cfpkt_extr_head(pkt, &tmp, 1);
	439	linkparam.u.video.connid = tmp;
8d545c8f SB	440	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	441	break;
b482cd20 SB	442	/* Link ID */
	443	cfpkt_extr_head(pkt, &linkid, 1);
	444	break;
	445
	446	case CFCTRL_SRV_DATAGRAM:
	447	cfpkt_extr_head(pkt, &tmp32, 4);
	448	linkparam.u.datagram.connid =
	449	le32_to_cpu(tmp32);
8d545c8f SB	450	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	451	break;
b482cd20 SB	452	/* Link ID */
	453	cfpkt_extr_head(pkt, &linkid, 1);
	454	break;
	455	case CFCTRL_SRV_RFM:
	456	/* Construct a frame, convert
	457	* DatagramConnectionID
	458	* to network format long and copy it out...
	459	*/
	460	cfpkt_extr_head(pkt, &tmp32, 4);
	461	linkparam.u.rfm.connid =
	462	le32_to_cpu(tmp32);
	463	cp = (u8 *) linkparam.u.rfm.volume;
	464	for (cfpkt_extr_head(pkt, &tmp, 1);
	465	cfpkt_more(pkt) && tmp != '\0';
	466	cfpkt_extr_head(pkt, &tmp, 1))
	467	*cp++ = tmp;
	468	*cp = '\0';
	469
8d545c8f SB	470	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	471	break;
b482cd20 SB	472	/* Link ID */
	473	cfpkt_extr_head(pkt, &linkid, 1);
	474
	475	break;
	476	case CFCTRL_SRV_UTIL:
	477	/* Construct a frame, convert
	478	* DatagramConnectionID
	479	* to network format long and copy it out...
	480	*/
	481	/* Fifosize KB */
	482	cfpkt_extr_head(pkt, &tmp16, 2);
	483	linkparam.u.utility.fifosize_kb =
	484	le16_to_cpu(tmp16);
	485	/* Fifosize bufs */
	486	cfpkt_extr_head(pkt, &tmp16, 2);
	487	linkparam.u.utility.fifosize_bufs =
	488	le16_to_cpu(tmp16);
	489	/* name */
	490	cp = (u8 *) linkparam.u.utility.name;
	491	caif_assert(sizeof(linkparam.u.utility.name)
	492	>= UTILITY_NAME_LENGTH);
	493	for (i = 0;
	494	i < UTILITY_NAME_LENGTH
	495	&& cfpkt_more(pkt); i++) {
	496	cfpkt_extr_head(pkt, &tmp, 1);
	497	*cp++ = tmp;
	498	}
	499	/* Length */
	500	cfpkt_extr_head(pkt, &len, 1);
	501	linkparam.u.utility.paramlen = len;
	502	/* Param Data */
	503	cp = linkparam.u.utility.params;
	504	while (cfpkt_more(pkt) && len--) {
	505	cfpkt_extr_head(pkt, &tmp, 1);
	506	*cp++ = tmp;
	507	}
8d545c8f SB	508	if (CFCTRL_ERR_BIT & cmdrsp)
8d545c8f SB	509	break;
b482cd20 SB	510	/* Link ID */
	511	cfpkt_extr_head(pkt, &linkid, 1);
	512	/* Length */
	513	cfpkt_extr_head(pkt, &len, 1);
	514	/* Param Data */
	515	cfpkt_extr_head(pkt, &param, len);
	516	break;
	517	default:
b31fa5ba JP	518	pr_warn("Request setup - invalid link type (%d)\n",
b31fa5ba JP	519	serv);
b482cd20 SB	520	goto error;
	521	}
	522
	523	rsp.cmd = cmd;
	524	rsp.param = linkparam;
	525	req = cfctrl_remove_req(cfctrl, &rsp);
	526
	527	if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) \|\|
	528	cfpkt_erroneous(pkt)) {
b31fa5ba	529	pr_err("Invalid O/E bit or parse error on CAIF control channel\n");
b482cd20 SB	530	cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
	531	0,
	532	req ? req->client_layer
	533	: NULL);
	534	} else {
	535	cfctrl->res.linksetup_rsp(cfctrl->serv.
	536	layer.up, linkid,
	537	serv, physlinkid,
	538	req ? req->
	539	client_layer : NULL);
	540	}
	541
	542	if (req != NULL)
	543	kfree(req);
	544	}
	545	break;
	546	case CFCTRL_CMD_LINK_DESTROY:
	547	cfpkt_extr_head(pkt, &linkid, 1);
8d545c8f	548	cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
b482cd20 SB	549	break;
b482cd20 SB	550	case CFCTRL_CMD_LINK_ERR:
b31fa5ba	551	pr_err("Frame Error Indication received\n");
b482cd20 SB	552	cfctrl->res.linkerror_ind();
	553	break;
	554	case CFCTRL_CMD_ENUM:
	555	cfctrl->res.enum_rsp();
	556	break;
	557	case CFCTRL_CMD_SLEEP:
	558	cfctrl->res.sleep_rsp();
	559	break;
	560	case CFCTRL_CMD_WAKE:
	561	cfctrl->res.wake_rsp();
	562	break;
	563	case CFCTRL_CMD_LINK_RECONF:
	564	cfctrl->res.restart_rsp();
	565	break;
	566	case CFCTRL_CMD_RADIO_SET:
	567	cfctrl->res.radioset_rsp();
	568	break;
	569	default:
b31fa5ba	570	pr_err("Unrecognized Control Frame\n");
b482cd20 SB	571	goto error;
	572	break;
	573	}
	574	ret = 0;
	575	error:
	576	cfpkt_destroy(pkt);
	577	return ret;
	578	}
	579
	580	static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
	581	int phyid)
	582	{
	583	struct cfctrl *this = container_obj(layr);
	584	switch (ctrl) {
	585	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
	586	case CAIF_CTRLCMD_FLOW_OFF_IND:
	587	spin_lock(&this->info_list_lock);
7aecf494	588	if (!list_empty(&this->list)) {
b31fa5ba	589	pr_debug("Received flow off in control layer\n");
b482cd20 SB	590	}
	591	spin_unlock(&this->info_list_lock);
	592	break;
	593	default:
	594	break;
	595	}
	596	}
	597
	598	#ifndef CAIF_NO_LOOP
	599	static int handle_loop(struct cfctrl ctrl, int cmd, struct cfpkt pkt)
	600	{
	601	static int last_linkid;
	602	u8 linkid, linktype, tmp;
	603	switch (cmd) {
	604	case CFCTRL_CMD_LINK_SETUP:
	605	spin_lock(&ctrl->loop_linkid_lock);
	606	for (linkid = last_linkid + 1; linkid < 255; linkid++)
	607	if (!ctrl->loop_linkused[linkid])
	608	goto found;
	609	for (linkid = last_linkid - 1; linkid > 0; linkid--)
	610	if (!ctrl->loop_linkused[linkid])
	611	goto found;
	612	spin_unlock(&ctrl->loop_linkid_lock);
b31fa5ba	613	pr_err("Out of link-ids\n");
b482cd20 SB	614	return -EINVAL;
	615	found:
	616	if (!ctrl->loop_linkused[linkid])
	617	ctrl->loop_linkused[linkid] = 1;
	618
	619	last_linkid = linkid;
	620
	621	cfpkt_add_trail(pkt, &linkid, 1);
	622	spin_unlock(&ctrl->loop_linkid_lock);
	623	cfpkt_peek_head(pkt, &linktype, 1);
	624	if (linktype == CFCTRL_SRV_UTIL) {
	625	tmp = 0x01;
	626	cfpkt_add_trail(pkt, &tmp, 1);
	627	cfpkt_add_trail(pkt, &tmp, 1);
	628	}
	629	break;
	630
	631	case CFCTRL_CMD_LINK_DESTROY:
	632	spin_lock(&ctrl->loop_linkid_lock);
	633	cfpkt_peek_head(pkt, &linkid, 1);
	634	ctrl->loop_linkused[linkid] = 0;
	635	spin_unlock(&ctrl->loop_linkid_lock);
	636	break;
	637	default:
	638	break;
	639	}
2aa40aef	640	return 0;
b482cd20 SB	641	}
b482cd20 SB	642	#endif