mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Sjur Braendeland](/assets/img/avatar_default.png)
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>
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/*
|
|
* 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;
|
|
}
|