174 lines
3.8 KiB
C
174 lines
3.8 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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#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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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_cl_enable_device(phy->device);
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if (r < 0) {
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pr_err("Could not enable device\n");
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return r;
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}
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r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
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if (r) {
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pr_err("Event cb registration failed\n");
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mei_cl_disable_device(phy->device);
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phy->powered = 0;
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return r;
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}
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phy->powered = 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(nfc_mei_phy_enable);
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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_cl_disable_device(phy->device);
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phy->powered = 0;
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}
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EXPORT_SYMBOL_GPL(nfc_mei_phy_disable);
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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_cl_send(phy->device, 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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void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
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{
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struct nfc_mei_phy *phy = context;
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if (phy->hard_fault != 0)
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return;
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if (events & BIT(MEI_CL_EVENT_RX)) {
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struct sk_buff *skb;
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int reply_size;
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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_cl_recv(device, 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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}
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EXPORT_SYMBOL_GPL(nfc_mei_event_cb);
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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 *device)
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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->device = device;
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mei_cl_set_drvdata(device, 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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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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