1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Marvell NFC driver: major functions
4 *
5 * Copyright (C) 2014-2015 Marvell International Ltd.
6 */
7
8 #include <linux/module.h>
9 #include <linux/gpio.h>
10 #include <linux/delay.h>
11 #include <linux/of_gpio.h>
12 #include <linux/nfc.h>
13 #include <net/nfc/nci.h>
14 #include <net/nfc/nci_core.h>
15 #include "nfcmrvl.h"
16
nfcmrvl_nci_open(struct nci_dev * ndev)17 static int nfcmrvl_nci_open(struct nci_dev *ndev)
18 {
19 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
20 int err;
21
22 if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
23 return 0;
24
25 /* Reset possible fault of previous session */
26 clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
27
28 err = priv->if_ops->nci_open(priv);
29
30 if (err)
31 clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
32
33 return err;
34 }
35
nfcmrvl_nci_close(struct nci_dev * ndev)36 static int nfcmrvl_nci_close(struct nci_dev *ndev)
37 {
38 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
39
40 if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
41 return 0;
42
43 priv->if_ops->nci_close(priv);
44
45 return 0;
46 }
47
nfcmrvl_nci_send(struct nci_dev * ndev,struct sk_buff * skb)48 static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
49 {
50 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
51
52 nfc_info(priv->dev, "send entry, len %d\n", skb->len);
53
54 skb->dev = (void *)ndev;
55
56 if (priv->config.hci_muxed) {
57 unsigned char *hdr;
58 unsigned char len = skb->len;
59
60 hdr = skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
61 hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
62 hdr[1] = NFCMRVL_HCI_OGF;
63 hdr[2] = NFCMRVL_HCI_OCF;
64 hdr[3] = len;
65 }
66
67 return priv->if_ops->nci_send(priv, skb);
68 }
69
nfcmrvl_nci_setup(struct nci_dev * ndev)70 static int nfcmrvl_nci_setup(struct nci_dev *ndev)
71 {
72 __u8 val = 1;
73
74 nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
75 return 0;
76 }
77
nfcmrvl_nci_fw_download(struct nci_dev * ndev,const char * firmware_name)78 static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
79 const char *firmware_name)
80 {
81 return nfcmrvl_fw_dnld_start(ndev, firmware_name);
82 }
83
84 static const struct nci_ops nfcmrvl_nci_ops = {
85 .open = nfcmrvl_nci_open,
86 .close = nfcmrvl_nci_close,
87 .send = nfcmrvl_nci_send,
88 .setup = nfcmrvl_nci_setup,
89 .fw_download = nfcmrvl_nci_fw_download,
90 };
91
nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,void * drv_data,const struct nfcmrvl_if_ops * ops,struct device * dev,const struct nfcmrvl_platform_data * pdata)92 struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
93 void *drv_data,
94 const struct nfcmrvl_if_ops *ops,
95 struct device *dev,
96 const struct nfcmrvl_platform_data *pdata)
97 {
98 struct nfcmrvl_private *priv;
99 int rc;
100 int headroom;
101 int tailroom;
102 u32 protocols;
103
104 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
105 if (!priv)
106 return ERR_PTR(-ENOMEM);
107
108 priv->drv_data = drv_data;
109 priv->if_ops = ops;
110 priv->dev = dev;
111 priv->phy = phy;
112
113 memcpy(&priv->config, pdata, sizeof(*pdata));
114
115 if (gpio_is_valid(priv->config.reset_n_io)) {
116 rc = gpio_request_one(priv->config.reset_n_io,
117 GPIOF_OUT_INIT_LOW,
118 "nfcmrvl_reset_n");
119 if (rc < 0) {
120 priv->config.reset_n_io = -EINVAL;
121 nfc_err(dev, "failed to request reset_n io\n");
122 }
123 }
124
125 if (phy == NFCMRVL_PHY_SPI) {
126 headroom = NCI_SPI_HDR_LEN;
127 tailroom = 1;
128 } else
129 headroom = tailroom = 0;
130
131 if (priv->config.hci_muxed)
132 headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
133
134 protocols = NFC_PROTO_JEWEL_MASK
135 | NFC_PROTO_MIFARE_MASK
136 | NFC_PROTO_FELICA_MASK
137 | NFC_PROTO_ISO14443_MASK
138 | NFC_PROTO_ISO14443_B_MASK
139 | NFC_PROTO_ISO15693_MASK
140 | NFC_PROTO_NFC_DEP_MASK;
141
142 priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
143 headroom, tailroom);
144 if (!priv->ndev) {
145 nfc_err(dev, "nci_allocate_device failed\n");
146 rc = -ENOMEM;
147 goto error_free_gpio;
148 }
149
150 rc = nfcmrvl_fw_dnld_init(priv);
151 if (rc) {
152 nfc_err(dev, "failed to initialize FW download %d\n", rc);
153 goto error_free_dev;
154 }
155
156 nci_set_drvdata(priv->ndev, priv);
157
158 rc = nci_register_device(priv->ndev);
159 if (rc) {
160 nfc_err(dev, "nci_register_device failed %d\n", rc);
161 goto error_fw_dnld_deinit;
162 }
163
164 /* Ensure that controller is powered off */
165 nfcmrvl_chip_halt(priv);
166
167 nfc_info(dev, "registered with nci successfully\n");
168 return priv;
169
170 error_fw_dnld_deinit:
171 nfcmrvl_fw_dnld_deinit(priv);
172 error_free_dev:
173 nci_free_device(priv->ndev);
174 error_free_gpio:
175 if (gpio_is_valid(priv->config.reset_n_io))
176 gpio_free(priv->config.reset_n_io);
177 kfree(priv);
178 return ERR_PTR(rc);
179 }
180 EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
181
nfcmrvl_nci_unregister_dev(struct nfcmrvl_private * priv)182 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
183 {
184 struct nci_dev *ndev = priv->ndev;
185
186 nci_unregister_device(ndev);
187 if (priv->ndev->nfc_dev->fw_download_in_progress)
188 nfcmrvl_fw_dnld_abort(priv);
189
190 nfcmrvl_fw_dnld_deinit(priv);
191
192 if (gpio_is_valid(priv->config.reset_n_io))
193 gpio_free(priv->config.reset_n_io);
194
195 nci_free_device(ndev);
196 kfree(priv);
197 }
198 EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
199
nfcmrvl_nci_recv_frame(struct nfcmrvl_private * priv,struct sk_buff * skb)200 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
201 {
202 if (priv->config.hci_muxed) {
203 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
204 skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
205 /* Data packet, let's extract NCI payload */
206 skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
207 } else {
208 /* Skip this packet */
209 kfree_skb(skb);
210 return 0;
211 }
212 }
213
214 if (priv->ndev->nfc_dev->fw_download_in_progress) {
215 nfcmrvl_fw_dnld_recv_frame(priv, skb);
216 return 0;
217 }
218
219 if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
220 nci_recv_frame(priv->ndev, skb);
221 else {
222 /* Drop this packet since nobody wants it */
223 kfree_skb(skb);
224 return 0;
225 }
226
227 return 0;
228 }
229 EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
230
nfcmrvl_chip_reset(struct nfcmrvl_private * priv)231 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
232 {
233 /* Reset possible fault of previous session */
234 clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
235
236 if (gpio_is_valid(priv->config.reset_n_io)) {
237 nfc_info(priv->dev, "reset the chip\n");
238 gpio_set_value(priv->config.reset_n_io, 0);
239 usleep_range(5000, 10000);
240 gpio_set_value(priv->config.reset_n_io, 1);
241 } else
242 nfc_info(priv->dev, "no reset available on this interface\n");
243 }
244
nfcmrvl_chip_halt(struct nfcmrvl_private * priv)245 void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
246 {
247 if (gpio_is_valid(priv->config.reset_n_io))
248 gpio_set_value(priv->config.reset_n_io, 0);
249 }
250
nfcmrvl_parse_dt(struct device_node * node,struct nfcmrvl_platform_data * pdata)251 int nfcmrvl_parse_dt(struct device_node *node,
252 struct nfcmrvl_platform_data *pdata)
253 {
254 int reset_n_io;
255
256 reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
257 if (reset_n_io < 0) {
258 pr_info("no reset-n-io config\n");
259 } else if (!gpio_is_valid(reset_n_io)) {
260 pr_err("invalid reset-n-io GPIO\n");
261 return reset_n_io;
262 }
263 pdata->reset_n_io = reset_n_io;
264 pdata->hci_muxed = of_property_read_bool(node, "hci-muxed");
265
266 return 0;
267 }
268 EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
269
270 MODULE_AUTHOR("Marvell International Ltd.");
271 MODULE_DESCRIPTION("Marvell NFC driver");
272 MODULE_LICENSE("GPL v2");
273
