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404 lines
8.4 KiB
404 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2013, Intel Corporation. |
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* |
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* MEI Library for mei bus nfc device access |
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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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