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b1c74247b9
Flow control is not used by all CAIF services. The usage of flow control is now part of the gerneal initialization function for CAIF Services. Signed-off-by: Sjur Braendeland@stericsson.com Signed-off-by: David S. Miller <davem@davemloft.net>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/stddef.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfsrvl.h>
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#include <net/caif/cfpkt.h>
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#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
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#define RFM_SEGMENTATION_BIT 0x01
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#define RFM_PAYLOAD 0x00
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#define RFM_CMD_BIT 0x80
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#define RFM_FLOW_OFF 0x81
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#define RFM_FLOW_ON 0x80
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#define RFM_SET_PIN 0x82
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#define RFM_CTRL_PKT_SIZE 1
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static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt);
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static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt);
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struct cflayer *cfrfml_create(u8 channel_id, struct dev_info *dev_info)
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{
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struct cfsrvl *rfm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
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if (!rfm) {
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pr_warning("CAIF: %s(): Out of memory\n", __func__);
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return NULL;
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}
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caif_assert(offsetof(struct cfsrvl, layer) == 0);
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memset(rfm, 0, sizeof(struct cfsrvl));
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cfsrvl_init(rfm, channel_id, dev_info, false);
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rfm->layer.receive = cfrfml_receive;
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rfm->layer.transmit = cfrfml_transmit;
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snprintf(rfm->layer.name, CAIF_LAYER_NAME_SZ, "rfm%d", channel_id);
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return &rfm->layer;
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}
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static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 tmp;
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bool segmented;
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int ret;
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caif_assert(layr->up != NULL);
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caif_assert(layr->receive != NULL);
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/*
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* RFM is taking care of segmentation and stripping of
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* segmentation bit.
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*/
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if (cfpkt_extr_head(pkt, &tmp, 1) < 0) {
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pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
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cfpkt_destroy(pkt);
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return -EPROTO;
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}
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segmented = tmp & RFM_SEGMENTATION_BIT;
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caif_assert(!segmented);
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ret = layr->up->receive(layr->up, pkt);
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return ret;
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}
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static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 tmp = 0;
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int ret;
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struct cfsrvl *service = container_obj(layr);
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caif_assert(layr->dn != NULL);
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caif_assert(layr->dn->transmit != NULL);
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if (!cfsrvl_ready(service, &ret))
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return ret;
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if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
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pr_err("CAIF: %s():Packet too large - size=%d\n",
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__func__, cfpkt_getlen(pkt));
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return -EOVERFLOW;
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}
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if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
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pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
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return -EPROTO;
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}
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/* Add info for MUX-layer to route the packet out. */
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cfpkt_info(pkt)->channel_id = service->layer.id;
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/*
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* To optimize alignment, we add up the size of CAIF header before
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* payload.
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*/
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cfpkt_info(pkt)->hdr_len = 1;
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cfpkt_info(pkt)->dev_info = &service->dev_info;
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ret = layr->dn->transmit(layr->dn, pkt);
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if (ret < 0)
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cfpkt_extr_head(pkt, &tmp, 1);
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return ret;
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}
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