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1 | /* |
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 | ||
27 | struct 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) \ | |
38 | do { \ | |
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) \ | |
45 | do { \ | |
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 | ||
51 | int 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 | } | |
71 | EXPORT_SYMBOL_GPL(nfc_mei_phy_enable); | |
72 | ||
73 | void 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 | } | |
83 | EXPORT_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 | */ | |
90 | static 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 | ||
104 | void 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 | } | |
133 | EXPORT_SYMBOL_GPL(nfc_mei_event_cb); | |
134 | ||
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, | |
139 | }; | |
140 | EXPORT_SYMBOL_GPL(mei_phy_ops); | |
141 | ||
142 | struct 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 | } | |
155 | EXPORT_SYMBOL_GPL(nfc_mei_phy_alloc); | |
156 | ||
157 | void nfc_mei_phy_free(struct nfc_mei_phy *phy) | |
158 | { | |
159 | kfree(phy); | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(nfc_mei_phy_free); | |
162 | ||
163 | MODULE_LICENSE("GPL"); | |
164 | MODULE_DESCRIPTION("mei bus NFC device interface"); |