2 * MEI Library for mei bus nfc device access
4 * Copyright (C) 2013 Intel Corporation. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/nfc.h>
33 } __attribute__((packed));
35 #define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
37 #define MEI_DUMP_SKB_IN(info, skb) \
39 pr_debug("%s:\n", info); \
40 print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
41 16, 1, (skb)->data, (skb)->len, false); \
44 #define MEI_DUMP_SKB_OUT(info, skb) \
46 pr_debug("%s:\n", info); \
47 print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
48 16, 1, (skb)->data, (skb)->len, false); \
51 int nfc_mei_phy_enable(void *phy_id)
54 struct nfc_mei_phy *phy = phy_id;
56 pr_info("%s\n", __func__);
58 if (phy->powered == 1)
61 r = mei_cl_enable_device(phy->device);
63 pr_err("MEI_PHY: Could not enable device\n");
71 EXPORT_SYMBOL_GPL(nfc_mei_phy_enable);
73 void nfc_mei_phy_disable(void *phy_id)
75 struct nfc_mei_phy *phy = phy_id;
77 pr_info("%s\n", __func__);
79 mei_cl_disable_device(phy->device);
83 EXPORT_SYMBOL_GPL(nfc_mei_phy_disable);
86 * Writing a frame must not return the number of written bytes.
87 * It must return either zero for success, or <0 for error.
88 * In addition, it must not alter the skb
90 static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
92 struct nfc_mei_phy *phy = phy_id;
95 MEI_DUMP_SKB_OUT("mei frame sent", skb);
97 r = mei_cl_send(phy->device, skb->data, skb->len);
104 void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
106 struct nfc_mei_phy *phy = context;
108 if (phy->hard_fault != 0)
111 if (events & BIT(MEI_CL_EVENT_RX)) {
115 skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
119 reply_size = mei_cl_recv(device, skb->data, MEI_NFC_MAX_READ);
120 if (reply_size < MEI_NFC_HEADER_SIZE) {
125 skb_put(skb, reply_size);
126 skb_pull(skb, MEI_NFC_HEADER_SIZE);
128 MEI_DUMP_SKB_IN("mei frame read", skb);
130 nfc_hci_recv_frame(phy->hdev, skb);
133 EXPORT_SYMBOL_GPL(nfc_mei_event_cb);
135 struct nfc_phy_ops mei_phy_ops = {
136 .write = nfc_mei_phy_write,
137 .enable = nfc_mei_phy_enable,
138 .disable = nfc_mei_phy_disable,
140 EXPORT_SYMBOL_GPL(mei_phy_ops);
142 struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device)
144 struct nfc_mei_phy *phy;
146 phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
150 phy->device = device;
151 mei_cl_set_drvdata(device, phy);
155 EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
157 void nfc_mei_phy_free(struct nfc_mei_phy *phy)
161 EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
163 MODULE_LICENSE("GPL");
164 MODULE_DESCRIPTION("mei bus NFC device interface");