Commit b482cd20 authored by Sjur Braendeland's avatar Sjur Braendeland Committed by David S. Miller

net-caif: add CAIF core protocol stack

CAIF generic protocol implementation. This layer is
somewhat generic in order to be able to use and test it outside
the Linux Kernel.

cfctrl.c     - CAIF control protocol layer
cfdbgl.c     - CAIF debug protocol layer
cfdgml.c     - CAIF datagram protocol layer
cffrml.c     - CAIF framing protocol layer
cfmuxl.c     - CAIF mux protocol layer
cfrfml.c     - CAIF remote file manager protocol layer
cfserl.c     - CAIF serial (fragmentation) protocol layer
cfsrvl.c     - CAIF generic service layer functions
cfutill.c    - CAIF utility protocol layer
cfveil.c     - CAIF AT protocol layer
cfvidl.c     - CAIF video protocol layer
Signed-off-by: default avatarSjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2721c5b9
/*
* 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 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(this, 0, sizeof(*this));
spin_lock_init(&this->info_list_lock);
atomic_set(&this->req_seq_no, 1);
atomic_set(&this->rsp_seq_no, 1);
this->serv.dev_info.id = 0xff;
this->serv.layer.id = 0;
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);
}
static void cfctrl_insert_req2(struct cfctrl *ctrl, enum cfctrl_cmd cmd,
u8 linkid, struct cflayer *user_layer)
{
struct cfctrl_request_info *req = kmalloc(sizeof(*req), GFP_KERNEL);
if (!req) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
}
req->client_layer = user_layer;
req->cmd = cmd;
req->channel_id = linkid;
cfctrl_insert_req(ctrl, req);
}
/* 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);
}
}
void 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;
}
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);
}
req = kmalloc(sizeof(*req), GFP_KERNEL);
if (!req) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return;
}
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);
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);
}
}
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;
}
cfctrl_insert_req2(cfctrl, CFCTRL_CMD_LINK_DESTROY, channelid, client);
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);
}
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) {
pr_info("CAIF: %s() CAIF Protocol error:"
"Response bit not set\n", __func__);
goto error;
}
}
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:
/* Link ID */
cfpkt_extr_head(pkt, &linkid, 1);
break;
case CFCTRL_SRV_VIDEO:
cfpkt_extr_head(pkt, &tmp, 1);
linkparam.u.video.connid = tmp;
/* 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);
/* 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';
/* 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;
}
/* 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);
rsp.cmd = cmd;
rsp.channel_id = linkid;
req = cfctrl_remove_req(cfctrl, &rsp);
cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid,
req ? req->client_layer : NULL);
if (req != NULL)
kfree(req);
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_warning("CAIF: %s(): Received flow off in "
"control layer", __func__);
}
spin_unlock(&this->info_list_lock);
break;
default: