1/*
2 * Marvell NFC driver: major functions
3 *
4 * Copyright (C) 2014-2015 Marvell International Ltd.
5 *
6 * This software file (the "File") is distributed by Marvell International
7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available on the worldwide web at
11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
12 *
13 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
14 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
15 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
16 * this warranty disclaimer.
17 */
18
19#include <linux/module.h>
20#include <linux/gpio.h>
21#include <linux/delay.h>
22#include <linux/of_gpio.h>
23#include <linux/nfc.h>
24#include <net/nfc/nci.h>
25#include <net/nfc/nci_core.h>
26#include "nfcmrvl.h"
27
28static int nfcmrvl_nci_open(struct nci_dev *ndev)
29{
30 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
31 int err;
32
33 if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
34 return 0;
35
36 /* Reset possible fault of previous session */
37 clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
38
39 err = priv->if_ops->nci_open(priv);
40
41 if (err)
42 clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
43
44 return err;
45}
46
47static int nfcmrvl_nci_close(struct nci_dev *ndev)
48{
49 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
50
51 if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
52 return 0;
53
54 priv->if_ops->nci_close(priv);
55
56 return 0;
57}
58
59static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
60{
61 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
62
63 nfc_info(priv->dev, "send entry, len %d\n", skb->len);
64
65 skb->dev = (void *)ndev;
66
67 if (priv->config.hci_muxed) {
68 unsigned char *hdr;
69 unsigned char len = skb->len;
70
71 hdr = skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
72 hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
73 hdr[1] = NFCMRVL_HCI_OGF;
74 hdr[2] = NFCMRVL_HCI_OCF;
75 hdr[3] = len;
76 }
77
78 return priv->if_ops->nci_send(priv, skb);
79}
80
81static int nfcmrvl_nci_setup(struct nci_dev *ndev)
82{
83 __u8 val = 1;
84
85 nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
86 return 0;
87}
88
89static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
90 const char *firmware_name)
91{
92 return nfcmrvl_fw_dnld_start(ndev, firmware_name);
93}
94
95static struct nci_ops nfcmrvl_nci_ops = {
96 .open = nfcmrvl_nci_open,
97 .close = nfcmrvl_nci_close,
98 .send = nfcmrvl_nci_send,
99 .setup = nfcmrvl_nci_setup,
100 .fw_download = nfcmrvl_nci_fw_download,
101};
102
103struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
104 void *drv_data,
105 struct nfcmrvl_if_ops *ops,
106 struct device *dev,
107 struct nfcmrvl_platform_data *pdata)
108{
109 struct nfcmrvl_private *priv;
110 int rc;
111 int headroom;
112 int tailroom;
113 u32 protocols;
114
115 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
116 if (!priv)
117 return ERR_PTR(-ENOMEM);
118
119 priv->drv_data = drv_data;
120 priv->if_ops = ops;
121 priv->dev = dev;
122 priv->phy = phy;
123
124 memcpy(&priv->config, pdata, sizeof(*pdata));
125
126 if (gpio_is_valid(priv->config.reset_n_io)) {
127 rc = gpio_request_one(priv->config.reset_n_io,
128 GPIOF_OUT_INIT_LOW,
129 "nfcmrvl_reset_n");
130 if (rc < 0) {
131 priv->config.reset_n_io = -EINVAL;
132 nfc_err(dev, "failed to request reset_n io\n");
133 }
134 }
135
136 if (phy == NFCMRVL_PHY_SPI) {
137 headroom = NCI_SPI_HDR_LEN;
138 tailroom = 1;
139 } else
140 headroom = tailroom = 0;
141
142 if (priv->config.hci_muxed)
143 headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
144
145 protocols = NFC_PROTO_JEWEL_MASK
146 | NFC_PROTO_MIFARE_MASK
147 | NFC_PROTO_FELICA_MASK
148 | NFC_PROTO_ISO14443_MASK
149 | NFC_PROTO_ISO14443_B_MASK
150 | NFC_PROTO_ISO15693_MASK
151 | NFC_PROTO_NFC_DEP_MASK;
152
153 priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
154 headroom, tailroom);
155 if (!priv->ndev) {
156 nfc_err(dev, "nci_allocate_device failed\n");
157 rc = -ENOMEM;
158 goto error_free_gpio;
159 }
160
161 rc = nfcmrvl_fw_dnld_init(priv);
162 if (rc) {
163 nfc_err(dev, "failed to initialize FW download %d\n", rc);
164 goto error_free_dev;
165 }
166
167 nci_set_drvdata(priv->ndev, priv);
168
169 rc = nci_register_device(priv->ndev);
170 if (rc) {
171 nfc_err(dev, "nci_register_device failed %d\n", rc);
172 goto error_fw_dnld_deinit;
173 }
174
175 /* Ensure that controller is powered off */
176 nfcmrvl_chip_halt(priv);
177
178 nfc_info(dev, "registered with nci successfully\n");
179 return priv;
180
181error_fw_dnld_deinit:
182 nfcmrvl_fw_dnld_deinit(priv);
183error_free_dev:
184 nci_free_device(priv->ndev);
185error_free_gpio:
186 if (gpio_is_valid(priv->config.reset_n_io))
187 gpio_free(priv->config.reset_n_io);
188 kfree(priv);
189 return ERR_PTR(rc);
190}
191EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
192
193void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
194{
195 struct nci_dev *ndev = priv->ndev;
196
197 if (priv->ndev->nfc_dev->fw_download_in_progress)
198 nfcmrvl_fw_dnld_abort(priv);
199
200 nfcmrvl_fw_dnld_deinit(priv);
201
202 if (gpio_is_valid(priv->config.reset_n_io))
203 gpio_free(priv->config.reset_n_io);
204
205 nci_unregister_device(ndev);
206 nci_free_device(ndev);
207 kfree(priv);
208}
209EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
210
211int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
212{
213 if (priv->config.hci_muxed) {
214 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
215 skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
216 /* Data packet, let's extract NCI payload */
217 skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
218 } else {
219 /* Skip this packet */
220 kfree_skb(skb);
221 return 0;
222 }
223 }
224
225 if (priv->ndev->nfc_dev->fw_download_in_progress) {
226 nfcmrvl_fw_dnld_recv_frame(priv, skb);
227 return 0;
228 }
229
230 if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
231 nci_recv_frame(priv->ndev, skb);
232 else {
233 /* Drop this packet since nobody wants it */
234 kfree_skb(skb);
235 return 0;
236 }
237
238 return 0;
239}
240EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
241
242void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
243{
244 /* Reset possible fault of previous session */
245 clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
246
247 if (priv->config.reset_n_io) {
248 nfc_info(priv->dev, "reset the chip\n");
249 gpio_set_value(priv->config.reset_n_io, 0);
250 usleep_range(5000, 10000);
251 gpio_set_value(priv->config.reset_n_io, 1);
252 } else
253 nfc_info(priv->dev, "no reset available on this interface\n");
254}
255
256void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
257{
258 if (priv->config.reset_n_io)
259 gpio_set_value(priv->config.reset_n_io, 0);
260}
261
262int nfcmrvl_parse_dt(struct device_node *node,
263 struct nfcmrvl_platform_data *pdata)
264{
265 int reset_n_io;
266
267 reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
268 if (reset_n_io < 0) {
269 pr_info("no reset-n-io config\n");
270 } else if (!gpio_is_valid(reset_n_io)) {
271 pr_err("invalid reset-n-io GPIO\n");
272 return reset_n_io;
273 }
274 pdata->reset_n_io = reset_n_io;
275
276 if (of_find_property(node, "hci-muxed", NULL))
277 pdata->hci_muxed = 1;
278 else
279 pdata->hci_muxed = 0;
280
281 return 0;
282}
283EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
284
285MODULE_AUTHOR("Marvell International Ltd.");
286MODULE_DESCRIPTION("Marvell NFC driver");
287MODULE_LICENSE("GPL v2");
288