417 lines
9.0 KiB
C
417 lines
9.0 KiB
C
/*
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* MEI Library for mei bus nfc device access
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*
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* Copyright (C) 2013 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/nfc.h>
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#include "mei_phy.h"
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struct mei_nfc_hdr {
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u8 cmd;
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u8 status;
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u16 req_id;
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u32 reserved;
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u16 data_size;
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} __packed;
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struct mei_nfc_cmd {
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struct mei_nfc_hdr hdr;
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u8 sub_command;
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u8 data[];
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} __packed;
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struct mei_nfc_reply {
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struct mei_nfc_hdr hdr;
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u8 sub_command;
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u8 reply_status;
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u8 data[];
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} __packed;
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struct mei_nfc_if_version {
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u8 radio_version_sw[3];
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u8 reserved[3];
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u8 radio_version_hw[3];
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u8 i2c_addr;
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u8 fw_ivn;
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u8 vendor_id;
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u8 radio_type;
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} __packed;
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struct mei_nfc_connect {
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u8 fw_ivn;
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u8 vendor_id;
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} __packed;
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struct mei_nfc_connect_resp {
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u8 fw_ivn;
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u8 vendor_id;
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u16 me_major;
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u16 me_minor;
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u16 me_hotfix;
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u16 me_build;
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} __packed;
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#define MEI_NFC_CMD_MAINTENANCE 0x00
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#define MEI_NFC_CMD_HCI_SEND 0x01
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#define MEI_NFC_CMD_HCI_RECV 0x02
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#define MEI_NFC_SUBCMD_CONNECT 0x00
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#define MEI_NFC_SUBCMD_IF_VERSION 0x01
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#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
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#define MEI_DUMP_SKB_IN(info, skb) \
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do { \
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pr_debug("%s:\n", info); \
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print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
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16, 1, (skb)->data, (skb)->len, false); \
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} while (0)
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#define MEI_DUMP_SKB_OUT(info, skb) \
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do { \
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pr_debug("%s:\n", info); \
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print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
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16, 1, (skb)->data, (skb)->len, false); \
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} while (0)
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#define MEI_DUMP_NFC_HDR(info, _hdr) \
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do { \
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pr_debug("%s:\n", info); \
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pr_debug("cmd=%02d status=%d req_id=%d rsvd=%d size=%d\n", \
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(_hdr)->cmd, (_hdr)->status, (_hdr)->req_id, \
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(_hdr)->reserved, (_hdr)->data_size); \
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} while (0)
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static int mei_nfc_if_version(struct nfc_mei_phy *phy)
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{
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struct mei_nfc_cmd cmd;
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struct mei_nfc_reply *reply = NULL;
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struct mei_nfc_if_version *version;
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size_t if_version_length;
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int bytes_recv, r;
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pr_info("%s\n", __func__);
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memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
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cmd.hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
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cmd.hdr.data_size = 1;
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cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
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MEI_DUMP_NFC_HDR("version", &cmd.hdr);
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r = mei_cldev_send(phy->cldev, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
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if (r < 0) {
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pr_err("Could not send IF version cmd\n");
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return r;
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}
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/* to be sure on the stack we alloc memory */
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if_version_length = sizeof(struct mei_nfc_reply) +
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sizeof(struct mei_nfc_if_version);
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reply = kzalloc(if_version_length, GFP_KERNEL);
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if (!reply)
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return -ENOMEM;
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bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply, if_version_length);
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if (bytes_recv < 0 || bytes_recv < if_version_length) {
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pr_err("Could not read IF version\n");
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r = -EIO;
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goto err;
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}
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version = (struct mei_nfc_if_version *)reply->data;
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phy->fw_ivn = version->fw_ivn;
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phy->vendor_id = version->vendor_id;
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phy->radio_type = version->radio_type;
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err:
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kfree(reply);
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return r;
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}
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static int mei_nfc_connect(struct nfc_mei_phy *phy)
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{
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struct mei_nfc_cmd *cmd, *reply;
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struct mei_nfc_connect *connect;
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struct mei_nfc_connect_resp *connect_resp;
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size_t connect_length, connect_resp_length;
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int bytes_recv, r;
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pr_info("%s\n", __func__);
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connect_length = sizeof(struct mei_nfc_cmd) +
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sizeof(struct mei_nfc_connect);
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connect_resp_length = sizeof(struct mei_nfc_cmd) +
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sizeof(struct mei_nfc_connect_resp);
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cmd = kzalloc(connect_length, GFP_KERNEL);
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if (!cmd)
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return -ENOMEM;
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connect = (struct mei_nfc_connect *)cmd->data;
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reply = kzalloc(connect_resp_length, GFP_KERNEL);
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if (!reply) {
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kfree(cmd);
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return -ENOMEM;
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}
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connect_resp = (struct mei_nfc_connect_resp *)reply->data;
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cmd->hdr.cmd = MEI_NFC_CMD_MAINTENANCE;
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cmd->hdr.data_size = 3;
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cmd->sub_command = MEI_NFC_SUBCMD_CONNECT;
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connect->fw_ivn = phy->fw_ivn;
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connect->vendor_id = phy->vendor_id;
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MEI_DUMP_NFC_HDR("connect request", &cmd->hdr);
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r = mei_cldev_send(phy->cldev, (u8 *)cmd, connect_length);
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if (r < 0) {
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pr_err("Could not send connect cmd %d\n", r);
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goto err;
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}
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bytes_recv = mei_cldev_recv(phy->cldev, (u8 *)reply,
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connect_resp_length);
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if (bytes_recv < 0) {
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r = bytes_recv;
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pr_err("Could not read connect response %d\n", r);
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goto err;
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}
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MEI_DUMP_NFC_HDR("connect reply", &reply->hdr);
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pr_info("IVN 0x%x Vendor ID 0x%x\n",
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connect_resp->fw_ivn, connect_resp->vendor_id);
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pr_info("ME FW %d.%d.%d.%d\n",
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connect_resp->me_major, connect_resp->me_minor,
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connect_resp->me_hotfix, connect_resp->me_build);
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r = 0;
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err:
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kfree(reply);
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kfree(cmd);
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return r;
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}
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static int mei_nfc_send(struct nfc_mei_phy *phy, u8 *buf, size_t length)
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{
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struct mei_nfc_hdr *hdr;
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u8 *mei_buf;
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int err;
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err = -ENOMEM;
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mei_buf = kzalloc(length + MEI_NFC_HEADER_SIZE, GFP_KERNEL);
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if (!mei_buf)
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goto out;
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hdr = (struct mei_nfc_hdr *)mei_buf;
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hdr->cmd = MEI_NFC_CMD_HCI_SEND;
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hdr->status = 0;
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hdr->req_id = phy->req_id;
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hdr->reserved = 0;
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hdr->data_size = length;
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MEI_DUMP_NFC_HDR("send", hdr);
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memcpy(mei_buf + MEI_NFC_HEADER_SIZE, buf, length);
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err = mei_cldev_send(phy->cldev, mei_buf, length + MEI_NFC_HEADER_SIZE);
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if (err < 0)
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goto out;
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if (!wait_event_interruptible_timeout(phy->send_wq,
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phy->recv_req_id == phy->req_id, HZ)) {
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pr_err("NFC MEI command timeout\n");
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err = -ETIME;
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} else {
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phy->req_id++;
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}
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out:
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kfree(mei_buf);
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return err;
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}
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/*
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* Writing a frame must not return the number of written bytes.
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* It must return either zero for success, or <0 for error.
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* In addition, it must not alter the skb
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*/
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static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
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{
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struct nfc_mei_phy *phy = phy_id;
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int r;
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MEI_DUMP_SKB_OUT("mei frame sent", skb);
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r = mei_nfc_send(phy, skb->data, skb->len);
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if (r > 0)
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r = 0;
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return r;
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}
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static int mei_nfc_recv(struct nfc_mei_phy *phy, u8 *buf, size_t length)
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{
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struct mei_nfc_hdr *hdr;
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int received_length;
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received_length = mei_cldev_recv(phy->cldev, buf, length);
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if (received_length < 0)
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return received_length;
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hdr = (struct mei_nfc_hdr *) buf;
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MEI_DUMP_NFC_HDR("receive", hdr);
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if (hdr->cmd == MEI_NFC_CMD_HCI_SEND) {
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phy->recv_req_id = hdr->req_id;
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wake_up(&phy->send_wq);
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return 0;
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}
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return received_length;
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}
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static void nfc_mei_rx_cb(struct mei_cl_device *cldev)
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{
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struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
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struct sk_buff *skb;
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int reply_size;
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if (!phy)
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return;
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if (phy->hard_fault != 0)
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return;
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skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
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if (!skb)
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return;
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reply_size = mei_nfc_recv(phy, skb->data, MEI_NFC_MAX_READ);
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if (reply_size < MEI_NFC_HEADER_SIZE) {
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kfree_skb(skb);
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return;
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}
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skb_put(skb, reply_size);
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skb_pull(skb, MEI_NFC_HEADER_SIZE);
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MEI_DUMP_SKB_IN("mei frame read", skb);
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nfc_hci_recv_frame(phy->hdev, skb);
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}
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static int nfc_mei_phy_enable(void *phy_id)
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{
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int r;
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struct nfc_mei_phy *phy = phy_id;
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pr_info("%s\n", __func__);
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if (phy->powered == 1)
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return 0;
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r = mei_cldev_enable(phy->cldev);
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if (r < 0) {
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pr_err("Could not enable device %d\n", r);
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return r;
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}
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r = mei_nfc_if_version(phy);
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if (r < 0) {
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pr_err("Could not enable device %d\n", r);
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goto err;
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}
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r = mei_nfc_connect(phy);
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if (r < 0) {
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pr_err("Could not connect to device %d\n", r);
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goto err;
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}
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r = mei_cldev_register_rx_cb(phy->cldev, nfc_mei_rx_cb);
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if (r) {
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pr_err("Event cb registration failed %d\n", r);
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goto err;
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}
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phy->powered = 1;
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return 0;
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err:
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phy->powered = 0;
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mei_cldev_disable(phy->cldev);
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return r;
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}
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static void nfc_mei_phy_disable(void *phy_id)
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{
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struct nfc_mei_phy *phy = phy_id;
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pr_info("%s\n", __func__);
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mei_cldev_disable(phy->cldev);
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phy->powered = 0;
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}
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struct nfc_phy_ops mei_phy_ops = {
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.write = nfc_mei_phy_write,
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.enable = nfc_mei_phy_enable,
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.disable = nfc_mei_phy_disable,
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};
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EXPORT_SYMBOL_GPL(mei_phy_ops);
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struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *cldev)
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{
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struct nfc_mei_phy *phy;
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phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
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if (!phy)
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return NULL;
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phy->cldev = cldev;
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init_waitqueue_head(&phy->send_wq);
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mei_cldev_set_drvdata(cldev, phy);
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return phy;
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}
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EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
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void nfc_mei_phy_free(struct nfc_mei_phy *phy)
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{
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mei_cldev_disable(phy->cldev);
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kfree(phy);
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}
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EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("mei bus NFC device interface");
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