| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson AB 2010 |
| 3 | * Author: Sjur Brendeland |
| 4 | * License terms: GNU General Public License (GPL) version 2 |
| 5 | */ |
| 6 | |
| 7 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <net/caif/caif_layer.h> |
| 14 | #include <net/caif/cfsrvl.h> |
| 15 | #include <net/caif/cfpkt.h> |
| 16 | |
| 17 | #define container_obj(layr) ((struct cfsrvl *) layr) |
| 18 | #define UTIL_PAYLOAD 0x00 |
| 19 | #define UTIL_CMD_BIT 0x80 |
| 20 | #define UTIL_REMOTE_SHUTDOWN 0x82 |
| 21 | #define UTIL_FLOW_OFF 0x81 |
| 22 | #define UTIL_FLOW_ON 0x80 |
| 23 | |
| 24 | static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt); |
| 25 | static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt); |
| 26 | |
| 27 | struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info) |
| 28 | { |
| 29 | struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
| 30 | if (!util) |
| 31 | return NULL; |
| 32 | caif_assert(offsetof(struct cfsrvl, layer) == 0); |
| 33 | cfsrvl_init(util, channel_id, dev_info, true); |
| 34 | util->layer.receive = cfutill_receive; |
| 35 | util->layer.transmit = cfutill_transmit; |
| 36 | snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1"); |
| 37 | return &util->layer; |
| 38 | } |
| 39 | |
| 40 | static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt) |
| 41 | { |
| 42 | u8 cmd = -1; |
| 43 | struct cfsrvl *service = container_obj(layr); |
| 44 | caif_assert(layr != NULL); |
| 45 | caif_assert(layr->up != NULL); |
| 46 | caif_assert(layr->up->receive != NULL); |
| 47 | caif_assert(layr->up->ctrlcmd != NULL); |
| 48 | if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { |
| 49 | pr_err("Packet is erroneous!\n"); |
| 50 | cfpkt_destroy(pkt); |
| 51 | return -EPROTO; |
| 52 | } |
| 53 | |
| 54 | switch (cmd) { |
| 55 | case UTIL_PAYLOAD: |
| 56 | return layr->up->receive(layr->up, pkt); |
| 57 | case UTIL_FLOW_OFF: |
| 58 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); |
| 59 | cfpkt_destroy(pkt); |
| 60 | return 0; |
| 61 | case UTIL_FLOW_ON: |
| 62 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); |
| 63 | cfpkt_destroy(pkt); |
| 64 | return 0; |
| 65 | case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */ |
| 66 | pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n"); |
| 67 | layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0); |
| 68 | service->open = false; |
| 69 | cfpkt_destroy(pkt); |
| 70 | return 0; |
| 71 | default: |
| 72 | cfpkt_destroy(pkt); |
| 73 | pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd); |
| 74 | return -EPROTO; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt) |
| 79 | { |
| 80 | u8 zero = 0; |
| 81 | struct caif_payload_info *info; |
| 82 | int ret; |
| 83 | struct cfsrvl *service = container_obj(layr); |
| 84 | caif_assert(layr != NULL); |
| 85 | caif_assert(layr->dn != NULL); |
| 86 | caif_assert(layr->dn->transmit != NULL); |
| 87 | |
| 88 | if (!cfsrvl_ready(service, &ret)) { |
| 89 | cfpkt_destroy(pkt); |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | cfpkt_add_head(pkt, &zero, 1); |
| 94 | /* Add info for MUX-layer to route the packet out. */ |
| 95 | info = cfpkt_info(pkt); |
| 96 | info->channel_id = service->layer.id; |
| 97 | /* |
| 98 | * To optimize alignment, we add up the size of CAIF header before |
| 99 | * payload. |
| 100 | */ |
| 101 | info->hdr_len = 1; |
| 102 | info->dev_info = &service->dev_info; |
| 103 | return layr->dn->transmit(layr->dn, pkt); |
| 104 | } |