xref: /openbmc/linux/drivers/nfc/nxp-nci/core.c (revision 9a234a2a)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Generic driver for NXP NCI NFC chips
4  *
5  * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
6  *
7  * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
8  *
9  * Derived from PN544 device driver:
10  * Copyright (C) 2012  Intel Corporation. All rights reserved.
11  */
12 
13 #include <linux/delay.h>
14 #include <linux/module.h>
15 #include <linux/nfc.h>
16 
17 #include <net/nfc/nci_core.h>
18 
19 #include "nxp-nci.h"
20 
21 #define NXP_NCI_HDR_LEN	4
22 
23 #define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
24 			       NFC_PROTO_MIFARE_MASK | \
25 			       NFC_PROTO_FELICA_MASK | \
26 			       NFC_PROTO_ISO14443_MASK | \
27 			       NFC_PROTO_ISO14443_B_MASK | \
28 			       NFC_PROTO_NFC_DEP_MASK)
29 
30 #define NXP_NCI_RF_PLL_UNLOCKED_NTF nci_opcode_pack(NCI_GID_RF_MGMT, 0x21)
31 #define NXP_NCI_RF_TXLDO_ERROR_NTF nci_opcode_pack(NCI_GID_RF_MGMT, 0x23)
32 
33 static int nxp_nci_open(struct nci_dev *ndev)
34 {
35 	struct nxp_nci_info *info = nci_get_drvdata(ndev);
36 	int r = 0;
37 
38 	mutex_lock(&info->info_lock);
39 
40 	if (info->mode != NXP_NCI_MODE_COLD) {
41 		r = -EBUSY;
42 		goto open_exit;
43 	}
44 
45 	if (info->phy_ops->set_mode)
46 		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
47 
48 	info->mode = NXP_NCI_MODE_NCI;
49 
50 open_exit:
51 	mutex_unlock(&info->info_lock);
52 	return r;
53 }
54 
55 static int nxp_nci_close(struct nci_dev *ndev)
56 {
57 	struct nxp_nci_info *info = nci_get_drvdata(ndev);
58 	int r = 0;
59 
60 	mutex_lock(&info->info_lock);
61 
62 	if (info->phy_ops->set_mode)
63 		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
64 
65 	info->mode = NXP_NCI_MODE_COLD;
66 
67 	mutex_unlock(&info->info_lock);
68 	return r;
69 }
70 
71 static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
72 {
73 	struct nxp_nci_info *info = nci_get_drvdata(ndev);
74 	int r;
75 
76 	if (!info->phy_ops->write) {
77 		kfree_skb(skb);
78 		return -EOPNOTSUPP;
79 	}
80 
81 	if (info->mode != NXP_NCI_MODE_NCI) {
82 		kfree_skb(skb);
83 		return -EINVAL;
84 	}
85 
86 	r = info->phy_ops->write(info->phy_id, skb);
87 	if (r < 0) {
88 		kfree_skb(skb);
89 		return r;
90 	}
91 
92 	consume_skb(skb);
93 	return 0;
94 }
95 
96 static int nxp_nci_rf_pll_unlocked_ntf(struct nci_dev *ndev,
97 				       struct sk_buff *skb)
98 {
99 	nfc_err(&ndev->nfc_dev->dev,
100 		"PLL didn't lock. Missing or unstable clock?\n");
101 
102 	return 0;
103 }
104 
105 static int nxp_nci_rf_txldo_error_ntf(struct nci_dev *ndev,
106 				      struct sk_buff *skb)
107 {
108 	nfc_err(&ndev->nfc_dev->dev,
109 		"RF transmitter couldn't start. Bad power and/or configuration?\n");
110 
111 	return 0;
112 }
113 
114 static const struct nci_driver_ops nxp_nci_core_ops[] = {
115 	{
116 		.opcode = NXP_NCI_RF_PLL_UNLOCKED_NTF,
117 		.ntf = nxp_nci_rf_pll_unlocked_ntf,
118 	},
119 	{
120 		.opcode = NXP_NCI_RF_TXLDO_ERROR_NTF,
121 		.ntf = nxp_nci_rf_txldo_error_ntf,
122 	},
123 };
124 
125 static const struct nci_ops nxp_nci_ops = {
126 	.open = nxp_nci_open,
127 	.close = nxp_nci_close,
128 	.send = nxp_nci_send,
129 	.fw_download = nxp_nci_fw_download,
130 	.core_ops = nxp_nci_core_ops,
131 	.n_core_ops = ARRAY_SIZE(nxp_nci_core_ops),
132 };
133 
134 int nxp_nci_probe(void *phy_id, struct device *pdev,
135 		  const struct nxp_nci_phy_ops *phy_ops,
136 		  unsigned int max_payload,
137 		  struct nci_dev **ndev)
138 {
139 	struct nxp_nci_info *info;
140 	int r;
141 
142 	info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
143 	if (!info)
144 		return -ENOMEM;
145 
146 	info->phy_id = phy_id;
147 	info->pdev = pdev;
148 	info->phy_ops = phy_ops;
149 	info->max_payload = max_payload;
150 	INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
151 	init_completion(&info->fw_info.cmd_completion);
152 	mutex_init(&info->info_lock);
153 
154 	if (info->phy_ops->set_mode) {
155 		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
156 		if (r < 0)
157 			return r;
158 	}
159 
160 	info->mode = NXP_NCI_MODE_COLD;
161 
162 	info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
163 					 NXP_NCI_HDR_LEN, 0);
164 	if (!info->ndev)
165 		return -ENOMEM;
166 
167 	nci_set_parent_dev(info->ndev, pdev);
168 	nci_set_drvdata(info->ndev, info);
169 	r = nci_register_device(info->ndev);
170 	if (r < 0) {
171 		nci_free_device(info->ndev);
172 		return r;
173 	}
174 
175 	*ndev = info->ndev;
176 	return r;
177 }
178 EXPORT_SYMBOL(nxp_nci_probe);
179 
180 void nxp_nci_remove(struct nci_dev *ndev)
181 {
182 	struct nxp_nci_info *info = nci_get_drvdata(ndev);
183 
184 	if (info->mode == NXP_NCI_MODE_FW)
185 		nxp_nci_fw_work_complete(info, -ESHUTDOWN);
186 	cancel_work_sync(&info->fw_info.work);
187 
188 	mutex_lock(&info->info_lock);
189 
190 	if (info->phy_ops->set_mode)
191 		info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
192 
193 	nci_unregister_device(ndev);
194 	nci_free_device(ndev);
195 
196 	mutex_unlock(&info->info_lock);
197 }
198 EXPORT_SYMBOL(nxp_nci_remove);
199 
200 MODULE_LICENSE("GPL");
201 MODULE_DESCRIPTION("NXP NCI NFC driver");
202 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
203