[GitHub/exynos8895/android_kernel_samsung_universal8895.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;
	}
	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
	1	/*
	2	* Copyright (C) ST-Ericsson AB 2010
	3	* Author: Sjur Brendeland
	4	* License terms: GNU General Public License (GPL) version 2
	5	*/
	6
	7	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
	8
	9	#include <linux/stddef.h>
	10	#include <linux/spinlock.h>
	11	#include <linux/slab.h>
	12	#include <linux/pkt_sched.h>
	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
	21	#ifdef CAIF_NO_LOOP
	22	static int handle_loop(struct cfctrl *ctrl,
	23	int cmd, struct cfpkt *pkt){
	24	return -1;
	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	{
	37	struct dev_info dev_info;
	38	struct cfctrl *this =
	39	kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
	40	if (!this)
	41	return NULL;
	42	caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
	43	memset(&dev_info, 0, sizeof(dev_info));
	44	dev_info.id = 0xff;
	45	cfsrvl_init(&this->serv, 0, &dev_info, false);
	46	atomic_set(&this->req_seq_no, 1);
	47	atomic_set(&this->rsp_seq_no, 1);
	48	this->serv.layer.receive = cfctrl_recv;
	49	sprintf(this->serv.layer.name, "ctrl");
	50	this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
	51	#ifndef CAIF_NO_LOOP
	52	spin_lock_init(&this->loop_linkid_lock);
	53	this->loop_linkid = 1;
	54	#endif
	55	spin_lock_init(&this->info_list_lock);
	56	INIT_LIST_HEAD(&this->list);
	57	return &this->serv.layer;
	58	}
	59
	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
	74	static bool param_eq(const struct cfctrl_link_param *p1,
	75	const struct cfctrl_link_param *p2)
	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
	117	static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
	118	const struct cfctrl_request_info *r2)
	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 */
	129	static void cfctrl_insert_req(struct cfctrl *ctrl,
	130	struct cfctrl_request_info *req)
	131	{
	132	spin_lock_bh(&ctrl->info_list_lock);
	133	atomic_inc(&ctrl->req_seq_no);
	134	req->sequence_no = atomic_read(&ctrl->req_seq_no);
	135	list_add_tail(&req->list, &ctrl->list);
	136	spin_unlock_bh(&ctrl->info_list_lock);
	137	}
	138
	139	/* Compare and remove request */
	140	static struct cfctrl_request_info cfctrl_remove_req(struct cfctrl ctrl,
	141	struct cfctrl_request_info *req)
	142	{
	143	struct cfctrl_request_info p, tmp, *first;
	144
	145	first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
	146
	147	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	148	if (cfctrl_req_eq(req, p)) {
	149	if (p != first)
	150	pr_warn("Requests are not received in order\n");
	151
	152	atomic_set(&ctrl->rsp_seq_no,
	153	p->sequence_no);
	154	list_del(&p->list);
	155	goto out;
	156	}
	157	}
	158	p = NULL;
	159	out:
	160	return p;
	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
	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	{
	178	struct cfpkt *pkt;
	179	struct cfctrl *cfctrl = container_obj(layer);
	180	struct cflayer *dn = cfctrl->serv.layer.dn;
	181
	182	if (!dn) {
	183	pr_debug("not able to send enum request\n");
	184	return;
	185	}
	186	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	187	if (!pkt)
	188	return;
	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);
	195	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
	196	dn->transmit(dn, pkt);
	197	}
	198
	199	int cfctrl_linkup_request(struct cflayer *layer,
	200	struct cfctrl_link_param *param,
	201	struct cflayer *user_layer)
	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];
	210	struct cfpkt *pkt;
	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	}
	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);
	226	if (!pkt)
	227	return -ENOMEM;
	228	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
	229	cfpkt_addbdy(pkt, (param->chtype << 4) \| param->linktype);
	230	cfpkt_addbdy(pkt, (param->priority << 3) \| param->phyid);
	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:
	270	pr_warn("Request setup of bad link type = %d\n",
	271	param->linktype);
	272	return -EINVAL;
	273	}
	274	req = kzalloc(sizeof(*req), GFP_KERNEL);
	275	if (!req)
	276	return -ENOMEM;
	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);
	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	*/
	287	cfpkt_info(pkt)->dev_info->id = param->phyid;
	288	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
	289	ret =
	290	dn->transmit(dn, pkt);
	291	if (ret < 0) {
	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;
	299	}
	300	}
	301	return 0;
	302	}
	303
	304	int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
	305	struct cflayer *client)
	306	{
	307	int ret;
	308	struct cfpkt *pkt;
	309	struct cfctrl *cfctrl = container_obj(layer);
	310	struct cflayer *dn = cfctrl->serv.layer.dn;
	311
	312	if (!dn) {
	313	pr_debug("not able to send link-down request\n");
	314	return -ENODEV;
	315	}
	316	pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
	317	if (!pkt)
	318	return -ENOMEM;
	319	cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
	320	cfpkt_addbdy(pkt, channelid);
	321	init_info(cfpkt_info(pkt), cfctrl);
	322	cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
	323	ret =
	324	dn->transmit(dn, pkt);
	325	#ifndef CAIF_NO_LOOP
	326	cfctrl->loop_linkused[channelid] = 0;
	327	#endif
	328	return ret;
	329	}
	330
	331	int cfctrl_cancel_req(struct cflayer layr, struct cflayer adap_layer)
	332	{
	333	struct cfctrl_request_info p, tmp;
	334	struct cfctrl *ctrl = container_obj(layr);
	335	int found = 0;
	336	spin_lock_bh(&ctrl->info_list_lock);
	337
	338	list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
	339	if (p->client_layer == adap_layer) {
	340	list_del(&p->list);
	341	kfree(p);
	342	found++;
	343	}
	344	}
	345
	346	spin_unlock_bh(&ctrl->info_list_lock);
	347	return found;
	348	}
	349
	350	static int cfctrl_recv(struct cflayer layer, struct cfpkt pkt)
	351	{
	352	u8 cmdrsp;
	353	u8 cmd;
	354	int ret = -1;
	355	u16 tmp16;
	356	u8 len;
	357	u8 param[255];
	358	u8 linkid;
	359	struct cfctrl *cfctrl = container_obj(layer);
	360	struct cfctrl_request_info rsp, *req;
	361
	362
	363	cfpkt_extr_head(pkt, &cmdrsp, 1);
	364	cmd = cmdrsp & CFCTRL_CMD_MASK;
	365	if (cmd != CFCTRL_CMD_LINK_ERR
	366	&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
	367	&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
	368	if (handle_loop(cfctrl, cmd, pkt) != 0)
	369	cmdrsp \|= CFCTRL_ERR_BIT;
	370	}
	371
	372	switch (cmd) {
	373	case CFCTRL_CMD_LINK_SETUP:
	374	{
	375	enum cfctrl_srv serv;
	376	enum cfctrl_srv servtype;
	377	u8 endpoint;
	378	u8 physlinkid;
	379	u8 prio;
	380	u8 tmp;
	381	u32 tmp32;
	382	u8 *cp;
	383	int i;
	384	struct cfctrl_link_param linkparam;
	385	memset(&linkparam, 0, sizeof(linkparam));
	386
	387	cfpkt_extr_head(pkt, &tmp, 1);
	388
	389	serv = tmp & CFCTRL_SRV_MASK;
	390	linkparam.linktype = serv;
	391
	392	servtype = tmp >> 4;
	393	linkparam.chtype = servtype;
	394
	395	cfpkt_extr_head(pkt, &tmp, 1);
	396	physlinkid = tmp & 0x07;
	397	prio = tmp >> 3;
	398
	399	linkparam.priority = prio;
	400	linkparam.phyid = physlinkid;
	401	cfpkt_extr_head(pkt, &endpoint, 1);
	402	linkparam.endpoint = endpoint & 0x03;
	403
	404	switch (serv) {
	405	case CFCTRL_SRV_VEI:
	406	case CFCTRL_SRV_DBG:
	407	if (CFCTRL_ERR_BIT & cmdrsp)
	408	break;
	409	/* Link ID */
	410	cfpkt_extr_head(pkt, &linkid, 1);
	411	break;
	412	case CFCTRL_SRV_VIDEO:
	413	cfpkt_extr_head(pkt, &tmp, 1);
	414	linkparam.u.video.connid = tmp;
	415	if (CFCTRL_ERR_BIT & cmdrsp)
	416	break;
	417	/* Link ID */
	418	cfpkt_extr_head(pkt, &linkid, 1);
	419	break;
	420
	421	case CFCTRL_SRV_DATAGRAM:
	422	cfpkt_extr_head(pkt, &tmp32, 4);
	423	linkparam.u.datagram.connid =
	424	le32_to_cpu(tmp32);
	425	if (CFCTRL_ERR_BIT & cmdrsp)
	426	break;
	427	/* Link ID */
	428	cfpkt_extr_head(pkt, &linkid, 1);
	429	break;
	430	case CFCTRL_SRV_RFM:
	431	/* Construct a frame, convert
	432	* DatagramConnectionID
	433	* to network format long and copy it out...
	434	*/
	435	cfpkt_extr_head(pkt, &tmp32, 4);
	436	linkparam.u.rfm.connid =
	437	le32_to_cpu(tmp32);
	438	cp = (u8 *) linkparam.u.rfm.volume;
	439	for (cfpkt_extr_head(pkt, &tmp, 1);
	440	cfpkt_more(pkt) && tmp != '\0';
	441	cfpkt_extr_head(pkt, &tmp, 1))
	442	*cp++ = tmp;
	443	*cp = '\0';
	444
	445	if (CFCTRL_ERR_BIT & cmdrsp)
	446	break;
	447	/* Link ID */
	448	cfpkt_extr_head(pkt, &linkid, 1);
	449
	450	break;
	451	case CFCTRL_SRV_UTIL:
	452	/* Construct a frame, convert
	453	* DatagramConnectionID
	454	* to network format long and copy it out...
	455	*/
	456	/* Fifosize KB */
	457	cfpkt_extr_head(pkt, &tmp16, 2);
	458	linkparam.u.utility.fifosize_kb =
	459	le16_to_cpu(tmp16);
	460	/* Fifosize bufs */
	461	cfpkt_extr_head(pkt, &tmp16, 2);
	462	linkparam.u.utility.fifosize_bufs =
	463	le16_to_cpu(tmp16);
	464	/* name */
	465	cp = (u8 *) linkparam.u.utility.name;
	466	caif_assert(sizeof(linkparam.u.utility.name)
	467	>= UTILITY_NAME_LENGTH);
	468	for (i = 0;
	469	i < UTILITY_NAME_LENGTH
	470	&& cfpkt_more(pkt); i++) {
	471	cfpkt_extr_head(pkt, &tmp, 1);
	472	*cp++ = tmp;
	473	}
	474	/* Length */
	475	cfpkt_extr_head(pkt, &len, 1);
	476	linkparam.u.utility.paramlen = len;
	477	/* Param Data */
	478	cp = linkparam.u.utility.params;
	479	while (cfpkt_more(pkt) && len--) {
	480	cfpkt_extr_head(pkt, &tmp, 1);
	481	*cp++ = tmp;
	482	}
	483	if (CFCTRL_ERR_BIT & cmdrsp)
	484	break;
	485	/* Link ID */
	486	cfpkt_extr_head(pkt, &linkid, 1);
	487	/* Length */
	488	cfpkt_extr_head(pkt, &len, 1);
	489	/* Param Data */
	490	cfpkt_extr_head(pkt, &param, len);
	491	break;
	492	default:
	493	pr_warn("Request setup, invalid type (%d)\n",
	494	serv);
	495	goto error;
	496	}
	497
	498	rsp.cmd = cmd;
	499	rsp.param = linkparam;
	500	spin_lock_bh(&cfctrl->info_list_lock);
	501	req = cfctrl_remove_req(cfctrl, &rsp);
	502
	503	if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) \|\|
	504	cfpkt_erroneous(pkt)) {
	505	pr_err("Invalid O/E bit or parse error "
	506	"on CAIF control channel\n");
	507	cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
	508	0,
	509	req ? req->client_layer
	510	: NULL);
	511	} else {
	512	cfctrl->res.linksetup_rsp(cfctrl->serv.
	513	layer.up, linkid,
	514	serv, physlinkid,
	515	req ? req->
	516	client_layer : NULL);
	517	}
	518
	519	kfree(req);
	520
	521	spin_unlock_bh(&cfctrl->info_list_lock);
	522	}
	523	break;
	524	case CFCTRL_CMD_LINK_DESTROY:
	525	cfpkt_extr_head(pkt, &linkid, 1);
	526	cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
	527	break;
	528	case CFCTRL_CMD_LINK_ERR:
	529	pr_err("Frame Error Indication received\n");
	530	cfctrl->res.linkerror_ind();
	531	break;
	532	case CFCTRL_CMD_ENUM:
	533	cfctrl->res.enum_rsp();
	534	break;
	535	case CFCTRL_CMD_SLEEP:
	536	cfctrl->res.sleep_rsp();
	537	break;
	538	case CFCTRL_CMD_WAKE:
	539	cfctrl->res.wake_rsp();
	540	break;
	541	case CFCTRL_CMD_LINK_RECONF:
	542	cfctrl->res.restart_rsp();
	543	break;
	544	case CFCTRL_CMD_RADIO_SET:
	545	cfctrl->res.radioset_rsp();
	546	break;
	547	default:
	548	pr_err("Unrecognized Control Frame\n");
	549	goto error;
	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,
	558	int phyid)
	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:
	564	spin_lock_bh(&this->info_list_lock);
	565	if (!list_empty(&this->list))
	566	pr_debug("Received flow off in control layer\n");
	567	spin_unlock_bh(&this->info_list_lock);
	568	break;
	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	}
	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;
	595	static int dec;
	596	u8 linkid, linktype, tmp;
	597	switch (cmd) {
	598	case CFCTRL_CMD_LINK_SETUP:
	599	spin_lock_bh(&ctrl->loop_linkid_lock);
	600	if (!dec) {
	601	for (linkid = last_linkid + 1; linkid < 254; linkid++)
	602	if (!ctrl->loop_linkused[linkid])
	603	goto found;
	604	}
	605	dec = 1;
	606	for (linkid = last_linkid - 1; linkid > 1; linkid--)
	607	if (!ctrl->loop_linkused[linkid])
	608	goto found;
	609	spin_unlock_bh(&ctrl->loop_linkid_lock);
	610	return -1;
	611	found:
	612	if (linkid < 10)
	613	dec = 0;
	614
	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);
	621	spin_unlock_bh(&ctrl->loop_linkid_lock);
	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:
	631	spin_lock_bh(&ctrl->loop_linkid_lock);
	632	cfpkt_peek_head(pkt, &linkid, 1);
	633	ctrl->loop_linkused[linkid] = 0;
	634	spin_unlock_bh(&ctrl->loop_linkid_lock);
	635	break;
	636	default:
	637	break;
	638	}
	639	return 0;
	640	}
	641	#endif