/* * Writing a frame must not return the number of written bytes. * It must return either zero for success, or <0 for error. * In addition, it must not alter the skb */ static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb) { struct nfc_mei_phy *phy = phy_id; int r; MEI_DUMP_SKB_OUT("mei frame sent", skb); r = mei_cl_send(phy->device, skb->data, skb->len); if (r > 0) r = 0; return r; }
static int mei_nfc_if_version(struct nfc_mei_phy *phy) { struct mei_nfc_cmd cmd; struct mei_nfc_reply *reply = NULL; struct mei_nfc_if_version *version; size_t if_version_length; int bytes_recv, r; pr_info("%s\n", __func__); memset(&cmd, 0, sizeof(struct mei_nfc_cmd)); cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE; cmd.hdr.data_size = 1; cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION; MEI_DUMP_NFC_HDR("version", &cmd.hdr); r = mei_cl_send(phy->device, (u8 *)&cmd, sizeof(struct mei_nfc_cmd)); if (r < 0) { pr_err("Could not send IF version cmd\n"); return r; } /* to be sure on the stack we alloc memory */ if_version_length = sizeof(struct mei_nfc_reply) + sizeof(struct mei_nfc_if_version); reply = kzalloc(if_version_length, GFP_KERNEL); if (!reply) return -ENOMEM; bytes_recv = mei_cl_recv(phy->device, (u8 *)reply, if_version_length); if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) { pr_err("Could not read IF version\n"); r = -EIO; goto err; } version = (struct mei_nfc_if_version *)reply->data; phy->fw_ivn = version->fw_ivn; phy->vendor_id = version->vendor_id; phy->radio_type = version->radio_type; err: kfree(reply); return r; }
static int mei_nfc_send(struct nfc_mei_phy *phy, u8 *buf, size_t length) { struct mei_nfc_hdr *hdr; u8 *mei_buf; int err; err = -ENOMEM; mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL); if (!mei_buf) goto out; hdr = (struct mei_nfc_hdr *)mei_buf; hdr->cmd = MEI_NFC_CMD_HCI_SEND; hdr->status = 0; hdr->req_id = phy->req_id; hdr->reserved = 0; hdr->data_size = length; MEI_DUMP_NFC_HDR("send", hdr); memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length); err = mei_cl_send(phy->device, mei_buf, length + MEI_NFC_HEADER_SIZE); if (err < 0) goto out; if (!wait_event_interruptible_timeout(phy->send_wq, phy->recv_req_id == phy->req_id, HZ)) { pr_err("NFC MEI command timeout\n"); err = -ETIME; } else { phy->req_id++; } out: kfree(mei_buf); return err; }
static int mei_nfc_connect(struct nfc_mei_phy *phy) { struct mei_nfc_cmd *cmd, *reply; struct mei_nfc_connect *connect; struct mei_nfc_connect_resp *connect_resp; size_t connect_length, connect_resp_length; int bytes_recv, r; pr_info("%s\n", __func__); connect_length = sizeof(struct mei_nfc_cmd) + sizeof(struct mei_nfc_connect); connect_resp_length = sizeof(struct mei_nfc_cmd) + sizeof(struct mei_nfc_connect_resp); cmd = kzalloc(connect_length, GFP_KERNEL); if (!cmd) return -ENOMEM; connect = (struct mei_nfc_connect *)cmd->data; reply = kzalloc(connect_resp_length, GFP_KERNEL); if (!reply) { kfree(cmd); return -ENOMEM; } connect_resp = (struct mei_nfc_connect_resp *)reply->data; cmd->hdr.cmd = MEI_NFC_CMD_MAINTENANCE; cmd->hdr.data_size = 3; cmd->sub_command = MEI_NFC_SUBCMD_CONNECT; connect->fw_ivn = phy->fw_ivn; connect->vendor_id = phy->vendor_id; MEI_DUMP_NFC_HDR("connect request", &cmd->hdr); r = mei_cl_send(phy->device, (u8 *)cmd, connect_length); if (r < 0) { pr_err("Could not send connect cmd %d\n", r); goto err; } bytes_recv = mei_cl_recv(phy->device, (u8 *)reply, connect_resp_length); if (bytes_recv < 0) { r = bytes_recv; pr_err("Could not read connect response %d\n", r); goto err; } MEI_DUMP_NFC_HDR("connect reply", &reply->hdr); pr_info("IVN 0x%x Vendor ID 0x%x\n", connect_resp->fw_ivn, connect_resp->vendor_id); pr_info("ME FW %d.%d.%d.%d\n", connect_resp->me_major, connect_resp->me_minor, connect_resp->me_hotfix, connect_resp->me_build); r = 0; err: kfree(reply); kfree(cmd); return r; }