blob: b8f8abc422f0f929d1b93e1500c5a595e2deea46 [file] [log] [blame]
Eric Lapuyade4912e2f2013-04-15 11:19:20 +02001/*
2 * MEI Library for mei bus nfc device access
3 *
4 * Copyright (C) 2013 Intel Corporation. All rights reserved.
5 *
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.
9 *
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.
14 *
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.
19 */
20
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/nfc.h>
24
25#include "mei_phy.h"
26
27struct mei_nfc_hdr {
28 u8 cmd;
29 u8 status;
30 u16 req_id;
31 u32 reserved;
32 u16 data_size;
33} __attribute__((packed));
34
35#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
36
37#define MEI_DUMP_SKB_IN(info, skb) \
38do { \
39 pr_debug("%s:\n", info); \
40 print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
41 16, 1, (skb)->data, (skb)->len, false); \
42} while (0)
43
44#define MEI_DUMP_SKB_OUT(info, skb) \
45do { \
46 pr_debug("%s:\n", info); \
47 print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
48 16, 1, (skb)->data, (skb)->len, false); \
49} while (0)
50
51int nfc_mei_phy_enable(void *phy_id)
52{
53 int r;
54 struct nfc_mei_phy *phy = phy_id;
55
56 pr_info("%s\n", __func__);
57
58 if (phy->powered == 1)
59 return 0;
60
61 r = mei_cl_enable_device(phy->device);
62 if (r < 0) {
63 pr_err("MEI_PHY: Could not enable device\n");
64 return r;
65 }
66
67 phy->powered = 1;
68
69 return 0;
70}
71EXPORT_SYMBOL_GPL(nfc_mei_phy_enable);
72
73void nfc_mei_phy_disable(void *phy_id)
74{
75 struct nfc_mei_phy *phy = phy_id;
76
77 pr_info("%s\n", __func__);
78
79 mei_cl_disable_device(phy->device);
80
81 phy->powered = 0;
82}
83EXPORT_SYMBOL_GPL(nfc_mei_phy_disable);
84
85/*
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
89 */
90static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
91{
92 struct nfc_mei_phy *phy = phy_id;
93 int r;
94
95 MEI_DUMP_SKB_OUT("mei frame sent", skb);
96
97 r = mei_cl_send(phy->device, skb->data, skb->len);
98 if (r > 0)
99 r = 0;
100
101 return r;
102}
103
104void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
105{
106 struct nfc_mei_phy *phy = context;
107
108 if (phy->hard_fault != 0)
109 return;
110
111 if (events & BIT(MEI_CL_EVENT_RX)) {
112 struct sk_buff *skb;
113 int reply_size;
114
115 skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
116 if (!skb)
117 return;
118
119 reply_size = mei_cl_recv(device, skb->data, MEI_NFC_MAX_READ);
120 if (reply_size < MEI_NFC_HEADER_SIZE) {
121 kfree(skb);
122 return;
123 }
124
125 skb_put(skb, reply_size);
126 skb_pull(skb, MEI_NFC_HEADER_SIZE);
127
128 MEI_DUMP_SKB_IN("mei frame read", skb);
129
130 nfc_hci_recv_frame(phy->hdev, skb);
131 }
132}
133EXPORT_SYMBOL_GPL(nfc_mei_event_cb);
134
135struct nfc_phy_ops mei_phy_ops = {
136 .write = nfc_mei_phy_write,
137 .enable = nfc_mei_phy_enable,
138 .disable = nfc_mei_phy_disable,
139};
140EXPORT_SYMBOL_GPL(mei_phy_ops);
141
142struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device)
143{
144 struct nfc_mei_phy *phy;
145
146 phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
147 if (!phy)
148 return NULL;
149
150 phy->device = device;
151 mei_cl_set_drvdata(device, phy);
152
153 return phy;
154}
155EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
156
157void nfc_mei_phy_free(struct nfc_mei_phy *phy)
158{
159 kfree(phy);
160}
161EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
162
163MODULE_LICENSE("GPL");
164MODULE_DESCRIPTION("mei bus NFC device interface");