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");