ixgbe: Fix race when the VF driver does a reset
[linux/fpc-iii.git] / drivers / nfc / nxp-nci / core.c
blob2e4b004a96aaa130cdb539abf86d338211f611f3
1 /*
2 * Generic driver for NXP NCI NFC chips
4 * Copyright (C) 2014 NXP Semiconductors All rights reserved.
6 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
8 * Derived from PN544 device driver:
9 * Copyright (C) 2012 Intel Corporation. All rights reserved.
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms and conditions of the GNU General Public License,
13 * version 2, as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
24 #include <linux/delay.h>
25 #include <linux/gpio.h>
26 #include <linux/module.h>
27 #include <linux/nfc.h>
28 #include <linux/platform_data/nxp-nci.h>
30 #include <net/nfc/nci_core.h>
32 #include "nxp-nci.h"
34 #define NXP_NCI_HDR_LEN 4
36 #define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
37 NFC_PROTO_MIFARE_MASK | \
38 NFC_PROTO_FELICA_MASK | \
39 NFC_PROTO_ISO14443_MASK | \
40 NFC_PROTO_ISO14443_B_MASK | \
41 NFC_PROTO_NFC_DEP_MASK)
43 static int nxp_nci_open(struct nci_dev *ndev)
45 struct nxp_nci_info *info = nci_get_drvdata(ndev);
46 int r = 0;
48 mutex_lock(&info->info_lock);
50 if (info->mode != NXP_NCI_MODE_COLD) {
51 r = -EBUSY;
52 goto open_exit;
55 if (info->phy_ops->set_mode)
56 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
58 info->mode = NXP_NCI_MODE_NCI;
60 open_exit:
61 mutex_unlock(&info->info_lock);
62 return r;
65 static int nxp_nci_close(struct nci_dev *ndev)
67 struct nxp_nci_info *info = nci_get_drvdata(ndev);
68 int r = 0;
70 mutex_lock(&info->info_lock);
72 if (info->phy_ops->set_mode)
73 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
75 info->mode = NXP_NCI_MODE_COLD;
77 mutex_unlock(&info->info_lock);
78 return r;
81 static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
83 struct nxp_nci_info *info = nci_get_drvdata(ndev);
84 int r;
86 if (!info->phy_ops->write) {
87 r = -ENOTSUPP;
88 goto send_exit;
91 if (info->mode != NXP_NCI_MODE_NCI) {
92 r = -EINVAL;
93 goto send_exit;
96 r = info->phy_ops->write(info->phy_id, skb);
97 if (r < 0)
98 kfree_skb(skb);
100 send_exit:
101 return r;
104 static struct nci_ops nxp_nci_ops = {
105 .open = nxp_nci_open,
106 .close = nxp_nci_close,
107 .send = nxp_nci_send,
108 .fw_download = nxp_nci_fw_download,
111 int nxp_nci_probe(void *phy_id, struct device *pdev,
112 const struct nxp_nci_phy_ops *phy_ops,
113 unsigned int max_payload,
114 struct nci_dev **ndev)
116 struct nxp_nci_info *info;
117 int r;
119 info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
120 if (!info) {
121 r = -ENOMEM;
122 goto probe_exit;
125 info->phy_id = phy_id;
126 info->pdev = pdev;
127 info->phy_ops = phy_ops;
128 info->max_payload = max_payload;
129 INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
130 init_completion(&info->fw_info.cmd_completion);
131 mutex_init(&info->info_lock);
133 if (info->phy_ops->set_mode) {
134 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
135 if (r < 0)
136 goto probe_exit;
139 info->mode = NXP_NCI_MODE_COLD;
141 info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
142 NXP_NCI_HDR_LEN, 0);
143 if (!info->ndev) {
144 r = -ENOMEM;
145 goto probe_exit;
148 nci_set_parent_dev(info->ndev, pdev);
149 nci_set_drvdata(info->ndev, info);
150 r = nci_register_device(info->ndev);
151 if (r < 0)
152 goto probe_exit_free_nci;
154 *ndev = info->ndev;
156 goto probe_exit;
158 probe_exit_free_nci:
159 nci_free_device(info->ndev);
160 probe_exit:
161 return r;
163 EXPORT_SYMBOL(nxp_nci_probe);
165 void nxp_nci_remove(struct nci_dev *ndev)
167 struct nxp_nci_info *info = nci_get_drvdata(ndev);
169 if (info->mode == NXP_NCI_MODE_FW)
170 nxp_nci_fw_work_complete(info, -ESHUTDOWN);
171 cancel_work_sync(&info->fw_info.work);
173 mutex_lock(&info->info_lock);
175 if (info->phy_ops->set_mode)
176 info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
178 nci_unregister_device(ndev);
179 nci_free_device(ndev);
181 mutex_unlock(&info->info_lock);
183 EXPORT_SYMBOL(nxp_nci_remove);
185 MODULE_LICENSE("GPL");
186 MODULE_DESCRIPTION("NXP NCI NFC driver");
187 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");