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: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/caif/cfsrvl.c b/net/caif/cfsrvl.c
new file mode 100644
index 0000000..d470c51
--- /dev/null
+++ b/net/caif/cfsrvl.c
@@ -0,0 +1,185 @@
+/*
+ * 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;
+}