summaryrefslogtreecommitdiff
path: root/drivers/nfc/nfcmrvl/main.c
blob: a446590a71cafa699a382820ca4b89695565a678 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/*
 * Marvell NFC driver: major functions
 *
 * Copyright (C) 2014-2015 Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available on the worldwide web at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/of_gpio.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include "nfcmrvl.h"

static int nfcmrvl_nci_open(struct nci_dev *ndev)
{
	struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
	int err;

	if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
		return 0;

	/* Reset possible fault of previous session */
	clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);

	err = priv->if_ops->nci_open(priv);

	if (err)
		clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);

	return err;
}

static int nfcmrvl_nci_close(struct nci_dev *ndev)
{
	struct nfcmrvl_private *priv = nci_get_drvdata(ndev);

	if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
		return 0;

	priv->if_ops->nci_close(priv);

	return 0;
}

static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nfcmrvl_private *priv = nci_get_drvdata(ndev);

	nfc_info(priv->dev, "send entry, len %d\n", skb->len);

	skb->dev = (void *)ndev;

	if (priv->config.hci_muxed) {
		unsigned char *hdr;
		unsigned char len = skb->len;

		hdr = (char *) skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
		hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
		hdr[1] = NFCMRVL_HCI_OGF;
		hdr[2] = NFCMRVL_HCI_OCF;
		hdr[3] = len;
	}

	return priv->if_ops->nci_send(priv, skb);
}

static int nfcmrvl_nci_setup(struct nci_dev *ndev)
{
	__u8 val = 1;

	nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
	return 0;
}

static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
				   const char *firmware_name)
{
	return nfcmrvl_fw_dnld_start(ndev, firmware_name);
}

static struct nci_ops nfcmrvl_nci_ops = {
	.open = nfcmrvl_nci_open,
	.close = nfcmrvl_nci_close,
	.send = nfcmrvl_nci_send,
	.setup = nfcmrvl_nci_setup,
	.fw_download = nfcmrvl_nci_fw_download,
};

struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
				void *drv_data,
				struct nfcmrvl_if_ops *ops,
				struct device *dev,
				struct nfcmrvl_platform_data *pdata)
{
	struct nfcmrvl_private *priv;
	int rc;
	int headroom;
	int tailroom;
	u32 protocols;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return ERR_PTR(-ENOMEM);

	priv->drv_data = drv_data;
	priv->if_ops = ops;
	priv->dev = dev;
	priv->phy = phy;

	memcpy(&priv->config, pdata, sizeof(*pdata));

	if (priv->config.reset_n_io) {
		rc = gpio_request_one(priv->config.reset_n_io,
				      GPIOF_OUT_INIT_LOW,
				      "nfcmrvl_reset_n");
		if (rc < 0) {
			priv->config.reset_n_io = 0;
			nfc_err(dev, "failed to request reset_n io\n");
		}
	}

	if (phy == NFCMRVL_PHY_SPI) {
		headroom = NCI_SPI_HDR_LEN;
		tailroom = 1;
	} else
		headroom = tailroom = 0;

	if (priv->config.hci_muxed)
		headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;

	protocols = NFC_PROTO_JEWEL_MASK
		| NFC_PROTO_MIFARE_MASK
		| NFC_PROTO_FELICA_MASK
		| NFC_PROTO_ISO14443_MASK
		| NFC_PROTO_ISO14443_B_MASK
		| NFC_PROTO_ISO15693_MASK
		| NFC_PROTO_NFC_DEP_MASK;

	priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
					 headroom, tailroom);
	if (!priv->ndev) {
		nfc_err(dev, "nci_allocate_device failed\n");
		rc = -ENOMEM;
		goto error_free_gpio;
	}

	rc = nfcmrvl_fw_dnld_init(priv);
	if (rc) {
		nfc_err(dev, "failed to initialize FW download %d\n", rc);
		goto error_free_dev;
	}

	nci_set_drvdata(priv->ndev, priv);

	rc = nci_register_device(priv->ndev);
	if (rc) {
		nfc_err(dev, "nci_register_device failed %d\n", rc);
		goto error_fw_dnld_deinit;
	}

	/* Ensure that controller is powered off */
	nfcmrvl_chip_halt(priv);

	nfc_info(dev, "registered with nci successfully\n");
	return priv;

error_fw_dnld_deinit:
	nfcmrvl_fw_dnld_deinit(priv);
error_free_dev:
	nci_free_device(priv->ndev);
error_free_gpio:
	if (priv->config.reset_n_io)
		gpio_free(priv->config.reset_n_io);
	kfree(priv);
	return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);

void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
{
	struct nci_dev *ndev = priv->ndev;

	if (priv->ndev->nfc_dev->fw_download_in_progress)
		nfcmrvl_fw_dnld_abort(priv);

	nfcmrvl_fw_dnld_deinit(priv);

	if (priv->config.reset_n_io)
		gpio_free(priv->config.reset_n_io);

	nci_unregister_device(ndev);
	nci_free_device(ndev);
	kfree(priv);
}
EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);

int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
{
	if (priv->config.hci_muxed) {
		if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
		    skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
			/* Data packet, let's extract NCI payload */
			skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
		} else {
			/* Skip this packet */
			kfree_skb(skb);
			return 0;
		}
	}

	if (priv->ndev->nfc_dev->fw_download_in_progress) {
		nfcmrvl_fw_dnld_recv_frame(priv, skb);
		return 0;
	}

	if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
		nci_recv_frame(priv->ndev, skb);
	else {
		/* Drop this packet since nobody wants it */
		kfree_skb(skb);
		return 0;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);

void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
{
	/* Reset possible fault of previous session */
	clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);

	if (priv->config.reset_n_io) {
		nfc_info(priv->dev, "reset the chip\n");
		gpio_set_value(priv->config.reset_n_io, 0);
		usleep_range(5000, 10000);
		gpio_set_value(priv->config.reset_n_io, 1);
	} else
		nfc_info(priv->dev, "no reset available on this interface\n");
}

void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
{
	if (priv->config.reset_n_io)
		gpio_set_value(priv->config.reset_n_io, 0);
}

int nfcmrvl_parse_dt(struct device_node *node,
		     struct nfcmrvl_platform_data *pdata)
{
	int reset_n_io;

	reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
	if (reset_n_io < 0) {
		pr_info("no reset-n-io config\n");
		reset_n_io = 0;
	} else if (!gpio_is_valid(reset_n_io)) {
		pr_err("invalid reset-n-io GPIO\n");
		return reset_n_io;
	}
	pdata->reset_n_io = reset_n_io;

	if (of_find_property(node, "hci-muxed", NULL))
		pdata->hci_muxed = 1;
	else
		pdata->hci_muxed = 0;

	return 0;
}
EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);

MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell NFC driver");
MODULE_LICENSE("GPL v2");