| /* |
| * 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 = kmalloc(sizeof(*req), GFP_KERNEL); |
| if (!req) { |
| pr_warning("CAIF: %s(): Out of memory\n", __func__); |
| return -ENOMEM; |
| } |
| memset(req, 0, sizeof(*req)); |
| 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, ¶m, 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 |