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-rw-r--r--net/caif/cfctrl.c692
1 files changed, 692 insertions, 0 deletions
diff --git a/net/caif/cfctrl.c b/net/caif/cfctrl.c
new file mode 100644
index 000000000000..0ffe1e1ce901
--- /dev/null
+++ b/net/caif/cfctrl.c
@@ -0,0 +1,692 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#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 CAIF_FAILURE;
+}
+#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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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);
+ spin_lock_init(&this->info_list_lock);
+ 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);
+ 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)
+{
+ struct cfctrl_request_info *p;
+ spin_lock(&ctrl->info_list_lock);
+ req->next = NULL;
+ atomic_inc(&ctrl->req_seq_no);
+ req->sequence_no = atomic_read(&ctrl->req_seq_no);
+ if (ctrl->first_req == NULL) {
+ ctrl->first_req = req;
+ spin_unlock(&ctrl->info_list_lock);
+ return;
+ }
+ p = ctrl->first_req;
+ while (p->next != NULL)
+ p = p->next;
+ p->next = req;
+ 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;
+ struct cfctrl_request_info *ret;
+
+ spin_lock(&ctrl->info_list_lock);
+ if (ctrl->first_req == NULL) {
+ spin_unlock(&ctrl->info_list_lock);
+ return NULL;
+ }
+
+ if (cfctrl_req_eq(req, ctrl->first_req)) {
+ ret = ctrl->first_req;
+ caif_assert(ctrl->first_req);
+ atomic_set(&ctrl->rsp_seq_no,
+ ctrl->first_req->sequence_no);
+ ctrl->first_req = ctrl->first_req->next;
+ spin_unlock(&ctrl->info_list_lock);
+ return ret;
+ }
+
+ p = ctrl->first_req;
+
+ while (p->next != NULL) {
+ if (cfctrl_req_eq(req, p->next)) {
+ pr_warning("CAIF: %s(): Requests are not "
+ "received in order\n",
+ __func__);
+ ret = p->next;
+ atomic_set(&ctrl->rsp_seq_no,
+ p->next->sequence_no);
+ p->next = p->next->next;
+ spin_unlock(&ctrl->info_list_lock);
+ return ret;
+ }
+ p = p->next;
+ }
+ spin_unlock(&ctrl->info_list_lock);
+
+ pr_warning("CAIF: %s(): Request does not match\n",
+ __func__);
+ return NULL;
+}
+
+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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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("CAIF: %s(): Could not transmit enum message\n",
+ __func__);
+ 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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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_warning("CAIF: %s():Request setup of bad link type = %d\n",
+ __func__, param->linktype);
+ return -EINVAL;
+ }
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req) {
+ pr_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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("CAIF: %s(): Could not transmit linksetup request\n",
+ __func__);
+ 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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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("CAIF: %s(): Could not transmit link-down request\n",
+ __func__);
+ 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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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_warning("CAIF: %s(): Out of memory\n", __func__);
+ 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, *req;
+ struct cfctrl *ctrl = container_obj(layr);
+ spin_lock(&ctrl->info_list_lock);
+
+ if (ctrl->first_req == NULL) {
+ spin_unlock(&ctrl->info_list_lock);
+ return;
+ }
+
+ if (ctrl->first_req->client_layer == adap_layer) {
+
+ req = ctrl->first_req;
+ ctrl->first_req = ctrl->first_req->next;
+ kfree(req);
+ }
+
+ p = ctrl->first_req;
+ while (p != NULL && p->next != NULL) {
+ if (p->next->client_layer == adap_layer) {
+
+ req = p->next;
+ p->next = p->next->next;
+ kfree(p->next);
+ }
+ p = p->next;
+ }
+
+ 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) == CAIF_FAILURE)
+ 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_warning("CAIF: %s(): Request setup "
+ "- invalid link type (%d)",
+ __func__, 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("CAIF: %s(): Invalid O/E bit or parse "
+ "error on CAIF control channel",
+ __func__);
+ 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("CAIF: %s(): Frame Error Indication received\n",
+ __func__);
+ 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("CAIF: %s(): Unrecognized Control Frame\n", __func__);
+ 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 (this->first_req != NULL) {
+ pr_debug("CAIF: %s(): Received flow off in "
+ "control layer", __func__);
+ }
+ 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("CAIF: %s(): Out of link-ids\n", __func__);
+ 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 CAIF_SUCCESS;
+}
+#endif
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-03 12:10:34 +0000