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net-caif: add CAIF core protocol stack

Browse Source 
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: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sjur Braendeland
2010-03-30 13:56:23 +00:00
committed by David S. Miller
parent 2721c5b9dd
commit b482cd2053
11 changed files with 1981 additions and 0 deletions
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664
net/caif/cfctrl.c Normal file
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40
net/caif/cfdbgl.c Normal file
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/*
* 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/slab.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfdbgl_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *dbg = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!dbg) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(dbg, 0, sizeof(struct cfsrvl));
cfsrvl_init(dbg, channel_id, dev_info);
dbg->layer.receive = cfdbgl_receive;
dbg->layer.transmit = cfdbgl_transmit;
snprintf(dbg->layer.name, CAIF_LAYER_NAME_SZ - 1, "dbg%d", channel_id);
return &dbg->layer;
}
static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt)
{
return layr->up->receive(layr->up, pkt);
}
static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
return layr->dn->transmit(layr->dn, pkt);
}

108
net/caif/cfdgml.c Normal file
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/*
* 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/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define container_obj(layr) ((struct cfsrvl *) layr)
#define DGM_CMD_BIT 0x80
#define DGM_FLOW_OFF 0x81
#define DGM_FLOW_ON 0x80
#define DGM_CTRL_PKT_SIZE 1
static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!dgm) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(dgm, 0, sizeof(struct cfsrvl));
cfsrvl_init(dgm, channel_id, dev_info);
dgm->layer.receive = cfdgml_receive;
dgm->layer.transmit = cfdgml_transmit;
snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
return &dgm->layer;
}
static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u8 cmd = -1;
u8 dgmhdr[3];
int ret;
caif_assert(layr->up != NULL);
caif_assert(layr->receive != NULL);
caif_assert(layr->ctrlcmd != NULL);
if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
if ((cmd & DGM_CMD_BIT) == 0) {
if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
ret = layr->up->receive(layr->up, pkt);
return ret;
}
switch (cmd) {
case DGM_FLOW_OFF: /* FLOW OFF */
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
cfpkt_destroy(pkt);
return 0;
case DGM_FLOW_ON: /* FLOW ON */
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
cfpkt_destroy(pkt);
return 0;
default:
cfpkt_destroy(pkt);
pr_info("CAIF: %s(): Unknown datagram control %d (0x%x)\n",
__func__, cmd, cmd);
return -EPROTO;
}
}
static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u32 zero = 0;
struct caif_payload_info *info;
struct cfsrvl *service = container_obj(layr);
int ret;
if (!cfsrvl_ready(service, &ret))
return ret;
cfpkt_add_head(pkt, &zero, 4);
/* Add info for MUX-layer to route the packet out. */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
/* To optimize alignment, we add up the size of CAIF header
* before payload.
*/
info->hdr_len = 4;
info->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0) {
u32 tmp32;
cfpkt_extr_head(pkt, &tmp32, 4);
}
return ret;
}

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net/caif/cffrml.c Normal file
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/*
* CAIF Framing Layer.
*
* 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 <linux/crc-ccitt.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cffrml.h>
#define container_obj(layr) container_of(layr, struct cffrml, layer)
struct cffrml {
struct cflayer layer;
bool dofcs; /* !< FCS active */
};
static int cffrml_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt);
static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid);
static u32 cffrml_rcv_error;
static u32 cffrml_rcv_checsum_error;
struct cflayer *cffrml_create(u16 phyid, bool use_fcs)
{
struct cffrml *this = kmalloc(sizeof(struct cffrml), GFP_ATOMIC);
if (!this) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cffrml, layer) == 0);
memset(this, 0, sizeof(struct cflayer));
this->layer.receive = cffrml_receive;
this->layer.transmit = cffrml_transmit;
this->layer.ctrlcmd = cffrml_ctrlcmd;
snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "frm%d", phyid);
this->dofcs = use_fcs;
this->layer.id = phyid;
return (struct cflayer *) this;
}
void cffrml_set_uplayer(struct cflayer *this, struct cflayer *up)
{
this->up = up;
}
void cffrml_set_dnlayer(struct cflayer *this, struct cflayer *dn)
{
this->dn = dn;
}
static u16 cffrml_checksum(u16 chks, void *buf, u16 len)
{
/* FIXME: FCS should be moved to glue in order to use OS-Specific
* solutions
*/
return crc_ccitt(chks, buf, len);
}
static int cffrml_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u16 tmp;
u16 len;
u16 hdrchks;
u16 pktchks;
struct cffrml *this;
this = container_obj(layr);
cfpkt_extr_head(pkt, &tmp, 2);
len = le16_to_cpu(tmp);
/* Subtract for FCS on length if FCS is not used. */
if (!this->dofcs)
len -= 2;
if (cfpkt_setlen(pkt, len) < 0) {
++cffrml_rcv_error;
pr_err("CAIF: %s():Framing length error (%d)\n", __func__, len);
cfpkt_destroy(pkt);
return -EPROTO;
}
/*
* Don't do extract if FCS is false, rather do setlen - then we don't
* get a cache-miss.
*/
if (this->dofcs) {
cfpkt_extr_trail(pkt, &tmp, 2);
hdrchks = le16_to_cpu(tmp);
pktchks = cfpkt_iterate(pkt, cffrml_checksum, 0xffff);
if (pktchks != hdrchks) {
cfpkt_add_trail(pkt, &tmp, 2);
++cffrml_rcv_error;
++cffrml_rcv_checsum_error;
pr_info("CAIF: %s(): Frame checksum error "
"(0x%x != 0x%x)\n", __func__, hdrchks, pktchks);
return -EILSEQ;
}
}
if (cfpkt_erroneous(pkt)) {
++cffrml_rcv_error;
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
return layr->up->receive(layr->up, pkt);
}
static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
int tmp;
u16 chks;
u16 len;
int ret;
struct cffrml *this = container_obj(layr);
if (this->dofcs) {
chks = cfpkt_iterate(pkt, cffrml_checksum, 0xffff);
tmp = cpu_to_le16(chks);
cfpkt_add_trail(pkt, &tmp, 2);
} else {
cfpkt_pad_trail(pkt, 2);
}
len = cfpkt_getlen(pkt);
tmp = cpu_to_le16(len);
cfpkt_add_head(pkt, &tmp, 2);
cfpkt_info(pkt)->hdr_len += 2;
if (cfpkt_erroneous(pkt)) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
return -EPROTO;
}
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0) {
/* Remove header on faulty packet. */
cfpkt_extr_head(pkt, &tmp, 2);
}
return ret;
}
static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid)
{
if (layr->up->ctrlcmd)
layr->up->ctrlcmd(layr->up, ctrl, layr->id);
}

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/*
* 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/cfpkt.h>
#include <net/caif/cfmuxl.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cffrml.h>
#define container_obj(layr) container_of(layr, struct cfmuxl, layer)
#define CAIF_CTRL_CHANNEL 0
#define UP_CACHE_SIZE 8
#define DN_CACHE_SIZE 8
struct cfmuxl {
struct cflayer layer;
struct list_head srvl_list;
struct list_head frml_list;
struct cflayer *up_cache[UP_CACHE_SIZE];
struct cflayer *dn_cache[DN_CACHE_SIZE];
/*
* Set when inserting or removing downwards layers.
*/
spinlock_t transmit_lock;
/*
* Set when inserting or removing upwards layers.
*/
spinlock_t receive_lock;
};
static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt);
static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid);
static struct cflayer *get_up(struct cfmuxl *muxl, u16 id);
struct cflayer *cfmuxl_create(void)
{
struct cfmuxl *this = kmalloc(sizeof(struct cfmuxl), GFP_ATOMIC);
if (!this)
return NULL;
memset(this, 0, sizeof(*this));
this->layer.receive = cfmuxl_receive;
this->layer.transmit = cfmuxl_transmit;
this->layer.ctrlcmd = cfmuxl_ctrlcmd;
INIT_LIST_HEAD(&this->srvl_list);
INIT_LIST_HEAD(&this->frml_list);
spin_lock_init(&this->transmit_lock);
spin_lock_init(&this->receive_lock);
snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "mux");
return &this->layer;
}
int cfmuxl_set_uplayer(struct cflayer *layr, struct cflayer *up, u8 linkid)
{
struct cfmuxl *muxl = container_obj(layr);
spin_lock(&muxl->receive_lock);
list_add(&up->node, &muxl->srvl_list);
spin_unlock(&muxl->receive_lock);
return 0;
}
bool cfmuxl_is_phy_inuse(struct cflayer *layr, u8 phyid)
{
struct list_head *node;
struct cflayer *layer;
struct cfmuxl *muxl = container_obj(layr);
bool match = false;
spin_lock(&muxl->receive_lock);
list_for_each(node, &muxl->srvl_list) {
layer = list_entry(node, struct cflayer, node);
if (cfsrvl_phyid_match(layer, phyid)) {
match = true;
break;
}
}
spin_unlock(&muxl->receive_lock);
return match;
}
u8 cfmuxl_get_phyid(struct cflayer *layr, u8 channel_id)
{
struct cflayer *up;
int phyid;
struct cfmuxl *muxl = container_obj(layr);
spin_lock(&muxl->receive_lock);
up = get_up(muxl, channel_id);
if (up != NULL)
phyid = cfsrvl_getphyid(up);
else
phyid = 0;
spin_unlock(&muxl->receive_lock);
return phyid;
}
int cfmuxl_set_dnlayer(struct cflayer *layr, struct cflayer *dn, u8 phyid)
{
struct cfmuxl *muxl = (struct cfmuxl *) layr;
spin_lock(&muxl->transmit_lock);
list_add(&dn->node, &muxl->frml_list);
spin_unlock(&muxl->transmit_lock);
return 0;
}
static struct cflayer *get_from_id(struct list_head *list, u16 id)
{
struct list_head *node;
struct cflayer *layer;
list_for_each(node, list) {
layer = list_entry(node, struct cflayer, node);
if (layer->id == id)
return layer;
}
return NULL;
}
struct cflayer *cfmuxl_remove_dnlayer(struct cflayer *layr, u8 phyid)
{
struct cfmuxl *muxl = container_obj(layr);
struct cflayer *dn;
spin_lock(&muxl->transmit_lock);
memset(muxl->dn_cache, 0, sizeof(muxl->dn_cache));
dn = get_from_id(&muxl->frml_list, phyid);
if (dn == NULL) {
spin_unlock(&muxl->transmit_lock);
return NULL;
}
list_del(&dn->node);
caif_assert(dn != NULL);
spin_unlock(&muxl->transmit_lock);
return dn;
}
/* Invariant: lock is taken */
static struct cflayer *get_up(struct cfmuxl *muxl, u16 id)
{
struct cflayer *up;
int idx = id % UP_CACHE_SIZE;
up = muxl->up_cache[idx];
if (up == NULL || up->id != id) {
up = get_from_id(&muxl->srvl_list, id);
muxl->up_cache[idx] = up;
}
return up;
}
/* Invariant: lock is taken */
static struct cflayer *get_dn(struct cfmuxl *muxl, struct dev_info *dev_info)
{
struct cflayer *dn;
int idx = dev_info->id % DN_CACHE_SIZE;
dn = muxl->dn_cache[idx];
if (dn == NULL || dn->id != dev_info->id) {
dn = get_from_id(&muxl->frml_list, dev_info->id);
muxl->dn_cache[idx] = dn;
}
return dn;
}
struct cflayer *cfmuxl_remove_uplayer(struct cflayer *layr, u8 id)
{
struct cflayer *up;
struct cfmuxl *muxl = container_obj(layr);
spin_lock(&muxl->receive_lock);
up = get_up(muxl, id);
memset(muxl->up_cache, 0, sizeof(muxl->up_cache));
list_del(&up->node);
spin_unlock(&muxl->receive_lock);
return up;
}
static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt)
{
int ret;
struct cfmuxl *muxl = container_obj(layr);
u8 id;
struct cflayer *up;
if (cfpkt_extr_head(pkt, &id, 1) < 0) {
pr_err("CAIF: %s(): erroneous Caif Packet\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
spin_lock(&muxl->receive_lock);
up = get_up(muxl, id);
spin_unlock(&muxl->receive_lock);
if (up == NULL) {
pr_info("CAIF: %s():Received data on unknown link ID = %d "
"(0x%x) up == NULL", __func__, id, id);
cfpkt_destroy(pkt);
/*
* Don't return ERROR, since modem misbehaves and sends out
* flow on before linksetup response.
*/
return /* CFGLU_EPROT; */ 0;
}
ret = up->receive(up, pkt);
return ret;
}
static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
int ret;
struct cfmuxl *muxl = container_obj(layr);
u8 linkid;
struct cflayer *dn;
struct caif_payload_info *info = cfpkt_info(pkt);
dn = get_dn(muxl, cfpkt_info(pkt)->dev_info);
if (dn == NULL) {
pr_warning("CAIF: %s(): Send data on unknown phy "
"ID = %d (0x%x)\n",
__func__, info->dev_info->id, info->dev_info->id);
return -ENOTCONN;
}
info->hdr_len += 1;
linkid = info->channel_id;
cfpkt_add_head(pkt, &linkid, 1);
ret = dn->transmit(dn, pkt);
/* Remove MUX protocol header upon error. */
if (ret < 0)
cfpkt_extr_head(pkt, &linkid, 1);
return ret;
}
static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid)
{
struct cfmuxl *muxl = container_obj(layr);
struct list_head *node;
struct cflayer *layer;
list_for_each(node, &muxl->srvl_list) {
layer = list_entry(node, struct cflayer, node);
if (cfsrvl_phyid_match(layer, phyid))
layer->ctrlcmd(layer, ctrl, phyid);
}
}

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/*
* 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/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
#define RFM_SEGMENTATION_BIT 0x01
#define RFM_PAYLOAD 0x00
#define RFM_CMD_BIT 0x80
#define RFM_FLOW_OFF 0x81
#define RFM_FLOW_ON 0x80
#define RFM_SET_PIN 0x82
#define RFM_CTRL_PKT_SIZE 1
static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt);
static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl);
struct cflayer *cfrfml_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *rfm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!rfm) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(rfm, 0, sizeof(struct cfsrvl));
cfsrvl_init(rfm, channel_id, dev_info);
rfm->layer.modemcmd = cfservl_modemcmd;
rfm->layer.receive = cfrfml_receive;
rfm->layer.transmit = cfrfml_transmit;
snprintf(rfm->layer.name, CAIF_LAYER_NAME_SZ, "rfm%d", channel_id);
return &rfm->layer;
}
static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
{
return -EPROTO;
}
static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u8 tmp;
bool segmented;
int ret;
caif_assert(layr->up != NULL);
caif_assert(layr->receive != NULL);
/*
* RFM is taking care of segmentation and stripping of
* segmentation bit.
*/
if (cfpkt_extr_head(pkt, &tmp, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
segmented = tmp & RFM_SEGMENTATION_BIT;
caif_assert(!segmented);
ret = layr->up->receive(layr->up, pkt);
return ret;
}
static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u8 tmp = 0;
int ret;
struct cfsrvl *service = container_obj(layr);
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (!cfsrvl_ready(service, &ret))
return ret;
if (!cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_err("CAIF: %s():Packet too large - size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
return -EPROTO;
}
/* Add info for MUX-layer to route the packet out. */
cfpkt_info(pkt)->channel_id = service->layer.id;
/*
* To optimize alignment, we add up the size of CAIF header before
* payload.
*/
cfpkt_info(pkt)->hdr_len = 1;
cfpkt_info(pkt)->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0)
cfpkt_extr_head(pkt, &tmp, 1);
return ret;
}

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/*
* 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/cfserl.h>
#define container_obj(layr) ((struct cfserl *) layr)
#define CFSERL_STX 0x02
#define CAIF_MINIUM_PACKET_SIZE 4
struct cfserl {
struct cflayer layer;
struct cfpkt *incomplete_frm;
/* Protects parallel processing of incoming packets */
spinlock_t sync;
bool usestx;
};
#define STXLEN(layr) (layr->usestx ? 1 : 0)
static int cfserl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfserl_transmit(struct cflayer *layr, struct cfpkt *pkt);
static void cfserl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid);
struct cflayer *cfserl_create(int type, int instance, bool use_stx)
{
struct cfserl *this = kmalloc(sizeof(struct cfserl), GFP_ATOMIC);
if (!this) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfserl, layer) == 0);
memset(this, 0, sizeof(struct cfserl));
this->layer.receive = cfserl_receive;
this->layer.transmit = cfserl_transmit;
this->layer.ctrlcmd = cfserl_ctrlcmd;
this->layer.type = type;
this->usestx = use_stx;
spin_lock_init(&this->sync);
snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "ser1");
return &this->layer;
}
static int cfserl_receive(struct cflayer *l, struct cfpkt *newpkt)
{
struct cfserl *layr = container_obj(l);
u16 pkt_len;
struct cfpkt *pkt = NULL;
struct cfpkt *tail_pkt = NULL;
u8 tmp8;
u16 tmp;
u8 stx = CFSERL_STX;
int ret;
u16 expectlen = 0;
caif_assert(newpkt != NULL);
spin_lock(&layr->sync);
if (layr->incomplete_frm != NULL) {
layr->incomplete_frm =
cfpkt_append(layr->incomplete_frm, newpkt, expectlen);
pkt = layr->incomplete_frm;
} else {
pkt = newpkt;
}
layr->incomplete_frm = NULL;
do {
/* Search for STX at start of pkt if STX is used */
if (layr->usestx) {
cfpkt_extr_head(pkt, &tmp8, 1);
if (tmp8 != CFSERL_STX) {
while (cfpkt_more(pkt)
&& tmp8 != CFSERL_STX) {
cfpkt_extr_head(pkt, &tmp8, 1);
}
if (!cfpkt_more(pkt)) {
cfpkt_destroy(pkt);
layr->incomplete_frm = NULL;
spin_unlock(&layr->sync);
return -EPROTO;
}
}
}
pkt_len = cfpkt_getlen(pkt);
/*
* pkt_len is the accumulated length of the packet data
* we have received so far.
* Exit if frame doesn't hold length.
*/
if (pkt_len < 2) {
if (layr->usestx)
cfpkt_add_head(pkt, &stx, 1);
layr->incomplete_frm = pkt;
spin_unlock(&layr->sync);
return 0;
}
/*
* Find length of frame.
* expectlen is the length we need for a full frame.
*/
cfpkt_peek_head(pkt, &tmp, 2);
expectlen = le16_to_cpu(tmp) + 2;
/*
* Frame error handling
*/
if (expectlen < CAIF_MINIUM_PACKET_SIZE
|| expectlen > CAIF_MAX_FRAMESIZE) {
if (!layr->usestx) {
if (pkt != NULL)
cfpkt_destroy(pkt);
layr->incomplete_frm = NULL;
expectlen = 0;
spin_unlock(&layr->sync);
return -EPROTO;
}
continue;
}
if (pkt_len < expectlen) {
/* Too little received data */
if (layr->usestx)
cfpkt_add_head(pkt, &stx, 1);
layr->incomplete_frm = pkt;
spin_unlock(&layr->sync);
return 0;
}
/*
* Enough data for at least one frame.
* Split the frame, if too long
*/
if (pkt_len > expectlen)
tail_pkt = cfpkt_split(pkt, expectlen);
else
tail_pkt = NULL;
/* Send the first part of packet upwards.*/
spin_unlock(&layr->sync);
ret = layr->layer.up->receive(layr->layer.up, pkt);
spin_lock(&layr->sync);
if (ret == -EILSEQ) {
if (layr->usestx) {
if (tail_pkt != NULL)
pkt = cfpkt_append(pkt, tail_pkt, 0);
/* Start search for next STX if frame failed */
continue;
} else {
cfpkt_destroy(pkt);
pkt = NULL;
}
}
pkt = tail_pkt;
} while (pkt != NULL);
spin_unlock(&layr->sync);
return 0;
}
static int cfserl_transmit(struct cflayer *layer, struct cfpkt *newpkt)
{
struct cfserl *layr = container_obj(layer);
int ret;
u8 tmp8 = CFSERL_STX;
if (layr->usestx)
cfpkt_add_head(newpkt, &tmp8, 1);
ret = layer->dn->transmit(layer->dn, newpkt);
if (ret < 0)
cfpkt_extr_head(newpkt, &tmp8, 1);
return ret;
}
static void cfserl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid)
{
layr->up->ctrlcmd(layr->up, ctrl, phyid);
}

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/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define SRVL_CTRL_PKT_SIZE 1
#define SRVL_FLOW_OFF 0x81
#define SRVL_FLOW_ON 0x80
#define SRVL_SET_PIN 0x82
#define SRVL_CTRL_PKT_SIZE 1
#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
int phyid)
{
struct cfsrvl *service = container_obj(layr);
caif_assert(layr->up != NULL);
caif_assert(layr->up->ctrlcmd != NULL);
switch (ctrl) {
case CAIF_CTRLCMD_INIT_RSP:
service->open = true;
layr->up->ctrlcmd(layr->up, ctrl, phyid);
break;
case CAIF_CTRLCMD_DEINIT_RSP:
case CAIF_CTRLCMD_INIT_FAIL_RSP:
service->open = false;
layr->up->ctrlcmd(layr->up, ctrl, phyid);
break;
case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
if (phyid != service->dev_info.id)
break;
if (service->modem_flow_on)
layr->up->ctrlcmd(layr->up,
CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
service->phy_flow_on = false;
break;
case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
if (phyid != service->dev_info.id)
return;
if (service->modem_flow_on) {
layr->up->ctrlcmd(layr->up,
CAIF_CTRLCMD_FLOW_ON_IND,
phyid);
}
service->phy_flow_on = true;
break;
case CAIF_CTRLCMD_FLOW_OFF_IND:
if (service->phy_flow_on) {
layr->up->ctrlcmd(layr->up,
CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
}
service->modem_flow_on = false;
break;
case CAIF_CTRLCMD_FLOW_ON_IND:
if (service->phy_flow_on) {
layr->up->ctrlcmd(layr->up,
CAIF_CTRLCMD_FLOW_ON_IND, phyid);
}
service->modem_flow_on = true;
break;
case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
/* In case interface is down, let's fake a remove shutdown */
layr->up->ctrlcmd(layr->up,
CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
break;
case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
layr->up->ctrlcmd(layr->up, ctrl, phyid);
break;
default:
pr_warning("CAIF: %s(): "
"Unexpected ctrl in cfsrvl (%d)\n", __func__, ctrl);
/* We have both modem and phy flow on, send flow on */
layr->up->ctrlcmd(layr->up, ctrl, phyid);
service->phy_flow_on = true;
break;
}
}
static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
{
struct cfsrvl *service = container_obj(layr);
caif_assert(layr != NULL);
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
switch (ctrl) {
case CAIF_MODEMCMD_FLOW_ON_REQ:
{
struct cfpkt *pkt;
struct caif_payload_info *info;
u8 flow_on = SRVL_FLOW_ON;
pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
if (!pkt) {
pr_warning("CAIF: %s(): Out of memory\n",
__func__);
return -ENOMEM;
}
if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n",
__func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
info->hdr_len = 1;
info->dev_info = &service->dev_info;
return layr->dn->transmit(layr->dn, pkt);
}
case CAIF_MODEMCMD_FLOW_OFF_REQ:
{
struct cfpkt *pkt;
struct caif_payload_info *info;
u8 flow_off = SRVL_FLOW_OFF;
pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n",
__func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
info->hdr_len = 1;
info->dev_info = &service->dev_info;
return layr->dn->transmit(layr->dn, pkt);
}
default:
break;
}
return -EINVAL;
}
void cfservl_destroy(struct cflayer *layer)
{
kfree(layer);
}
void cfsrvl_init(struct cfsrvl *service,
u8 channel_id,
struct dev_info *dev_info)
{
caif_assert(offsetof(struct cfsrvl, layer) == 0);
service->open = false;
service->modem_flow_on = true;
service->phy_flow_on = true;
service->layer.id = channel_id;
service->layer.ctrlcmd = cfservl_ctrlcmd;
service->layer.modemcmd = cfservl_modemcmd;
service->dev_info = *dev_info;
}
bool cfsrvl_ready(struct cfsrvl *service, int *err)
{
if (service->open && service->modem_flow_on && service->phy_flow_on)
return true;
if (!service->open) {
*err = -ENOTCONN;
return false;
}
caif_assert(!(service->modem_flow_on && service->phy_flow_on));
*err = -EAGAIN;
return false;
}
u8 cfsrvl_getphyid(struct cflayer *layer)
{
struct cfsrvl *servl = container_obj(layer);
return servl->dev_info.id;
}
bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
{
struct cfsrvl *servl = container_obj(layer);
return servl->dev_info.id == phyid;
}

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/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define container_obj(layr) ((struct cfsrvl *) layr)
#define UTIL_PAYLOAD 0x00
#define UTIL_CMD_BIT 0x80
#define UTIL_REMOTE_SHUTDOWN 0x82
#define UTIL_FLOW_OFF 0x81
#define UTIL_FLOW_ON 0x80
#define UTIL_CTRL_PKT_SIZE 1
static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *util = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!util) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(util, 0, sizeof(struct cfsrvl));
cfsrvl_init(util, channel_id, dev_info);
util->layer.receive = cfutill_receive;
util->layer.transmit = cfutill_transmit;
snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1");
return &util->layer;
}
static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u8 cmd = -1;
struct cfsrvl *service = container_obj(layr);
caif_assert(layr != NULL);
caif_assert(layr->up != NULL);
caif_assert(layr->up->receive != NULL);
caif_assert(layr->up->ctrlcmd != NULL);
if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
switch (cmd) {
case UTIL_PAYLOAD:
return layr->up->receive(layr->up, pkt);
case UTIL_FLOW_OFF:
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
cfpkt_destroy(pkt);
return 0;
case UTIL_FLOW_ON:
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
cfpkt_destroy(pkt);
return 0;
case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */
pr_err("CAIF: %s(): REMOTE SHUTDOWN REQUEST RECEIVED\n",
__func__);
layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
service->open = false;
cfpkt_destroy(pkt);
return 0;
default:
cfpkt_destroy(pkt);
pr_warning("CAIF: %s(): Unknown service control %d (0x%x)\n",
__func__, cmd, cmd);
return -EPROTO;
}
}
static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u8 zero = 0;
struct caif_payload_info *info;
int ret;
struct cfsrvl *service = container_obj(layr);
caif_assert(layr != NULL);
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (!cfsrvl_ready(service, &ret))
return ret;
if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_err("CAIF: %s(): packet too large size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
cfpkt_add_head(pkt, &zero, 1);
/* Add info for MUX-layer to route the packet out. */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
/*
* To optimize alignment, we add up the size of CAIF header before
* payload.
*/
info->hdr_len = 1;
info->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0) {
u32 tmp32;
cfpkt_extr_head(pkt, &tmp32, 4);
}
return ret;
}

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/*
* 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/slab.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define VEI_PAYLOAD 0x00
#define VEI_CMD_BIT 0x80
#define VEI_FLOW_OFF 0x81
#define VEI_FLOW_ON 0x80
#define VEI_SET_PIN 0x82
#define VEI_CTRL_PKT_SIZE 1
#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *vei = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!vei) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(vei, 0, sizeof(struct cfsrvl));
cfsrvl_init(vei, channel_id, dev_info);
vei->layer.receive = cfvei_receive;
vei->layer.transmit = cfvei_transmit;
snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id);
return &vei->layer;
}
static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u8 cmd;
int ret;
caif_assert(layr->up != NULL);
caif_assert(layr->receive != NULL);
caif_assert(layr->ctrlcmd != NULL);
if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
switch (cmd) {
case VEI_PAYLOAD:
ret = layr->up->receive(layr->up, pkt);
return ret;
case VEI_FLOW_OFF:
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
cfpkt_destroy(pkt);
return 0;
case VEI_FLOW_ON:
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
cfpkt_destroy(pkt);
return 0;
case VEI_SET_PIN: /* SET RS232 PIN */
cfpkt_destroy(pkt);
return 0;
default: /* SET RS232 PIN */
pr_warning("CAIF: %s():Unknown VEI control packet %d (0x%x)!\n",
__func__, cmd, cmd);
cfpkt_destroy(pkt);
return -EPROTO;
}
}
static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u8 tmp = 0;
struct caif_payload_info *info;
int ret;
struct cfsrvl *service = container_obj(layr);
if (!cfsrvl_ready(service, &ret))
return ret;
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (!cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_warning("CAIF: %s(): Packet too large - size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
return -EPROTO;
}
/* Add info-> for MUX-layer to route the packet out. */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
info->hdr_len = 1;
info->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0)
cfpkt_extr_head(pkt, &tmp, 1);
return ret;
}

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/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define container_obj(layr) ((struct cfsrvl *) layr)
static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *vid = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!vid) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(vid, 0, sizeof(struct cfsrvl));
cfsrvl_init(vid, channel_id, dev_info);
vid->layer.receive = cfvidl_receive;
vid->layer.transmit = cfvidl_transmit;
snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
return &vid->layer;
}
static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u32 videoheader;
if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
return layr->up->receive(layr->up, pkt);
}
static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
struct cfsrvl *service = container_obj(layr);
struct caif_payload_info *info;
u32 videoheader = 0;
int ret;
if (!cfsrvl_ready(service, &ret))
return ret;
cfpkt_add_head(pkt, &videoheader, 4);
/* Add info for MUX-layer to route the packet out */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
info->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0)
cfpkt_extr_head(pkt, &videoheader, 4);
return ret;
}