blob: 85f90090cc1d1e167de6391e3481b597451555bd [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
Joe Perches17936b42013-04-05 12:27:39 -070021#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
Eric Lapuyade4912e2f2013-04-15 11:19:20 +020023#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/nfc.h>
26
27#include "mei_phy.h"
28
29struct mei_nfc_hdr {
30 u8 cmd;
31 u8 status;
32 u16 req_id;
33 u32 reserved;
34 u16 data_size;
Valentin Iliebda7eb22013-06-07 22:01:55 +030035} __packed;
Eric Lapuyade4912e2f2013-04-15 11:19:20 +020036
37#define MEI_NFC_MAX_READ (MEI_NFC_HEADER_SIZE + MEI_NFC_MAX_HCI_PAYLOAD)
38
39#define MEI_DUMP_SKB_IN(info, skb) \
40do { \
41 pr_debug("%s:\n", info); \
42 print_hex_dump_debug("mei in : ", DUMP_PREFIX_OFFSET, \
43 16, 1, (skb)->data, (skb)->len, false); \
44} while (0)
45
46#define MEI_DUMP_SKB_OUT(info, skb) \
47do { \
48 pr_debug("%s:\n", info); \
49 print_hex_dump_debug("mei out: ", DUMP_PREFIX_OFFSET, \
50 16, 1, (skb)->data, (skb)->len, false); \
51} while (0)
52
53int nfc_mei_phy_enable(void *phy_id)
54{
55 int r;
56 struct nfc_mei_phy *phy = phy_id;
57
58 pr_info("%s\n", __func__);
59
60 if (phy->powered == 1)
61 return 0;
62
63 r = mei_cl_enable_device(phy->device);
64 if (r < 0) {
Joe Perches17936b42013-04-05 12:27:39 -070065 pr_err("Could not enable device\n");
Valentin Iliebda7eb22013-06-07 22:01:55 +030066 return r;
Eric Lapuyade4912e2f2013-04-15 11:19:20 +020067 }
68
Samuel Ortiz73f3adb2013-04-30 23:48:50 +020069 r = mei_cl_register_event_cb(phy->device, nfc_mei_event_cb, phy);
70 if (r) {
Joe Perches17936b42013-04-05 12:27:39 -070071 pr_err("Event cb registration failed\n");
Samuel Ortiz73f3adb2013-04-30 23:48:50 +020072 mei_cl_disable_device(phy->device);
73 phy->powered = 0;
74
75 return r;
76 }
77
Eric Lapuyade4912e2f2013-04-15 11:19:20 +020078 phy->powered = 1;
79
80 return 0;
81}
82EXPORT_SYMBOL_GPL(nfc_mei_phy_enable);
83
84void nfc_mei_phy_disable(void *phy_id)
85{
86 struct nfc_mei_phy *phy = phy_id;
87
88 pr_info("%s\n", __func__);
89
90 mei_cl_disable_device(phy->device);
91
92 phy->powered = 0;
93}
94EXPORT_SYMBOL_GPL(nfc_mei_phy_disable);
95
96/*
97 * Writing a frame must not return the number of written bytes.
98 * It must return either zero for success, or <0 for error.
99 * In addition, it must not alter the skb
100 */
101static int nfc_mei_phy_write(void *phy_id, struct sk_buff *skb)
102{
103 struct nfc_mei_phy *phy = phy_id;
104 int r;
105
106 MEI_DUMP_SKB_OUT("mei frame sent", skb);
107
108 r = mei_cl_send(phy->device, skb->data, skb->len);
109 if (r > 0)
110 r = 0;
111
112 return r;
113}
114
115void nfc_mei_event_cb(struct mei_cl_device *device, u32 events, void *context)
116{
117 struct nfc_mei_phy *phy = context;
118
119 if (phy->hard_fault != 0)
120 return;
121
122 if (events & BIT(MEI_CL_EVENT_RX)) {
123 struct sk_buff *skb;
124 int reply_size;
125
126 skb = alloc_skb(MEI_NFC_MAX_READ, GFP_KERNEL);
127 if (!skb)
128 return;
129
130 reply_size = mei_cl_recv(device, skb->data, MEI_NFC_MAX_READ);
131 if (reply_size < MEI_NFC_HEADER_SIZE) {
132 kfree(skb);
133 return;
134 }
135
136 skb_put(skb, reply_size);
137 skb_pull(skb, MEI_NFC_HEADER_SIZE);
138
139 MEI_DUMP_SKB_IN("mei frame read", skb);
140
141 nfc_hci_recv_frame(phy->hdev, skb);
142 }
143}
144EXPORT_SYMBOL_GPL(nfc_mei_event_cb);
145
146struct nfc_phy_ops mei_phy_ops = {
147 .write = nfc_mei_phy_write,
148 .enable = nfc_mei_phy_enable,
149 .disable = nfc_mei_phy_disable,
150};
151EXPORT_SYMBOL_GPL(mei_phy_ops);
152
153struct nfc_mei_phy *nfc_mei_phy_alloc(struct mei_cl_device *device)
154{
155 struct nfc_mei_phy *phy;
156
157 phy = kzalloc(sizeof(struct nfc_mei_phy), GFP_KERNEL);
158 if (!phy)
159 return NULL;
160
161 phy->device = device;
162 mei_cl_set_drvdata(device, phy);
163
164 return phy;
165}
166EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc);
167
168void nfc_mei_phy_free(struct nfc_mei_phy *phy)
169{
170 kfree(phy);
171}
172EXPORT_SYMBOL_GPL(nfc_mei_phy_free);
173
174MODULE_LICENSE("GPL");
175MODULE_DESCRIPTION("mei bus NFC device interface");