diff options
Diffstat (limited to 'net/caif/cfsrvl.c')
| -rw-r--r-- | net/caif/cfsrvl.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/net/caif/cfsrvl.c b/net/caif/cfsrvl.c new file mode 100644 index 000000000..9cef9496a --- /dev/null +++ b/net/caif/cfsrvl.c @@ -0,0 +1,220 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) ST-Ericsson AB 2010 + * Author: Sjur Brendeland + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/pkt_sched.h> +#include <net/caif/caif_layer.h> +#include <net/caif/cfsrvl.h> +#include <net/caif/cfpkt.h> +#include <net/caif/caif_dev.h> + +#define SRVL_CTRL_PKT_SIZE 1 +#define SRVL_FLOW_OFF 0x81 +#define SRVL_FLOW_ON 0x80 +#define SRVL_SET_PIN 0x82 + +#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); + + if (layr->up == NULL || layr->up->ctrlcmd == NULL) + return; + + 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_warn("Unexpected ctrl in cfsrvl (%d)\n", 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); + + if (!service->supports_flowctrl) + return 0; + + 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) + return -ENOMEM; + + if (cfpkt_add_head(pkt, &flow_on, 1) < 0) { + pr_err("Packet is erroneous!\n"); + 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; + cfpkt_set_prio(pkt, TC_PRIO_CONTROL); + 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 (!pkt) + return -ENOMEM; + + if (cfpkt_add_head(pkt, &flow_off, 1) < 0) { + pr_err("Packet is erroneous!\n"); + 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; + cfpkt_set_prio(pkt, TC_PRIO_CONTROL); + return layr->dn->transmit(layr->dn, pkt); + } + default: + break; + } + return -EINVAL; +} + +static void cfsrvl_release(struct cflayer *layer) +{ + struct cfsrvl *service = container_of(layer, struct cfsrvl, layer); + kfree(service); +} + +void cfsrvl_init(struct cfsrvl *service, + u8 channel_id, + struct dev_info *dev_info, + bool supports_flowctrl) +{ + 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; + service->supports_flowctrl = supports_flowctrl; + service->release = cfsrvl_release; +} + +bool cfsrvl_ready(struct cfsrvl *service, int *err) +{ + if (!service->open) { + *err = -ENOTCONN; + return false; + } + return true; +} + +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; +} + +void caif_free_client(struct cflayer *adap_layer) +{ + struct cfsrvl *servl; + if (adap_layer == NULL || adap_layer->dn == NULL) + return; + servl = container_obj(adap_layer->dn); + servl->release(&servl->layer); +} +EXPORT_SYMBOL(caif_free_client); + +void caif_client_register_refcnt(struct cflayer *adapt_layer, + void (*hold)(struct cflayer *lyr), + void (*put)(struct cflayer *lyr)) +{ + struct cfsrvl *service; + + if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL)) + return; + service = container_of(adapt_layer->dn, struct cfsrvl, layer); + service->hold = hold; + service->put = put; +} +EXPORT_SYMBOL(caif_client_register_refcnt); |