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
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* I2C link layer for the NXP NCI driver
*
* Copyright (C) 2014 NXP Semiconductors All rights reserved.
* Copyright (C) 2012-2015 Intel Corporation. All rights reserved.
*
* Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
* Authors: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
*
* Derived from PN544 device driver:
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <linux/gpio/consumer.h>
#include <asm/unaligned.h>
#include <net/nfc/nfc.h>
#include "nxp-nci.h"
#define NXP_NCI_I2C_DRIVER_NAME "nxp-nci_i2c"
#define NXP_NCI_I2C_MAX_PAYLOAD 32
struct nxp_nci_i2c_phy {
struct i2c_client *i2c_dev;
struct nci_dev *ndev;
struct gpio_desc *gpiod_en;
struct gpio_desc *gpiod_fw;
int hard_fault; /*
* < 0 if hardware error occurred (e.g. i2c err)
* and prevents normal operation.
*/
};
static int nxp_nci_i2c_set_mode(void *phy_id,
enum nxp_nci_mode mode)
{
struct nxp_nci_i2c_phy *phy = (struct nxp_nci_i2c_phy *) phy_id;
gpiod_set_value(phy->gpiod_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
gpiod_set_value(phy->gpiod_en, (mode != NXP_NCI_MODE_COLD) ? 1 : 0);
usleep_range(10000, 15000);
if (mode == NXP_NCI_MODE_COLD)
phy->hard_fault = 0;
return 0;
}
static int nxp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
{
int r;
struct nxp_nci_i2c_phy *phy = phy_id;
struct i2c_client *client = phy->i2c_dev;
if (phy->hard_fault != 0)
return phy->hard_fault;
r = i2c_master_send(client, skb->data, skb->len);
if (r < 0) {
/* Retry, chip was in standby */
msleep(110);
r = i2c_master_send(client, skb->data, skb->len);
}
if (r < 0) {
nfc_err(&client->dev, "Error %d on I2C send\n", r);
} else if (r != skb->len) {
nfc_err(&client->dev,
"Invalid length sent: %u (expected %u)\n",
r, skb->len);
r = -EREMOTEIO;
} else {
/* Success but return 0 and not number of bytes */
r = 0;
}
return r;
}
static const struct nxp_nci_phy_ops i2c_phy_ops = {
.set_mode = nxp_nci_i2c_set_mode,
.write = nxp_nci_i2c_write,
};
static int nxp_nci_i2c_fw_read(struct nxp_nci_i2c_phy *phy,
struct sk_buff **skb)
{
struct i2c_client *client = phy->i2c_dev;
u16 header;
size_t frame_len;
int r;
r = i2c_master_recv(client, (u8 *) &header, NXP_NCI_FW_HDR_LEN);
if (r < 0) {
goto fw_read_exit;
} else if (r != NXP_NCI_FW_HDR_LEN) {
nfc_err(&client->dev, "Incorrect header length: %u\n", r);
r = -EBADMSG;
goto fw_read_exit;
}
frame_len = (be16_to_cpu(header) & NXP_NCI_FW_FRAME_LEN_MASK) +
NXP_NCI_FW_CRC_LEN;
*skb = alloc_skb(NXP_NCI_FW_HDR_LEN + frame_len, GFP_KERNEL);
if (*skb == NULL) {
r = -ENOMEM;
goto fw_read_exit;
}
skb_put_data(*skb, &header, NXP_NCI_FW_HDR_LEN);
r = i2c_master_recv(client, skb_put(*skb, frame_len), frame_len);
if (r < 0) {
goto fw_read_exit_free_skb;
} else if (r != frame_len) {
nfc_err(&client->dev,
"Invalid frame length: %u (expected %zu)\n",
r, frame_len);
r = -EBADMSG;
goto fw_read_exit_free_skb;
}
return 0;
fw_read_exit_free_skb:
kfree_skb(*skb);
fw_read_exit:
return r;
}
static int nxp_nci_i2c_nci_read(struct nxp_nci_i2c_phy *phy,
struct sk_buff **skb)
{
struct nci_ctrl_hdr header; /* May actually be a data header */
struct i2c_client *client = phy->i2c_dev;
int r;
r = i2c_master_recv(client, (u8 *) &header, NCI_CTRL_HDR_SIZE);
if (r < 0) {
goto nci_read_exit;
} else if (r != NCI_CTRL_HDR_SIZE) {
nfc_err(&client->dev, "Incorrect header length: %u\n", r);
r = -EBADMSG;
goto nci_read_exit;
}
*skb = alloc_skb(NCI_CTRL_HDR_SIZE + header.plen, GFP_KERNEL);
if (*skb == NULL) {
r = -ENOMEM;
goto nci_read_exit;
}
skb_put_data(*skb, (void *)&header, NCI_CTRL_HDR_SIZE);
if (!header.plen)
return 0;
r = i2c_master_recv(client, skb_put(*skb, header.plen), header.plen);
if (r < 0) {
goto nci_read_exit_free_skb;
} else if (r != header.plen) {
nfc_err(&client->dev,
"Invalid frame payload length: %u (expected %u)\n",
r, header.plen);
r = -EBADMSG;
goto nci_read_exit_free_skb;
}
return 0;
nci_read_exit_free_skb:
kfree_skb(*skb);
nci_read_exit:
return r;
}
static irqreturn_t nxp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
{
struct nxp_nci_i2c_phy *phy = phy_id;
struct i2c_client *client;
struct nxp_nci_info *info;
struct sk_buff *skb = NULL;
int r = 0;
if (!phy || !phy->ndev)
goto exit_irq_none;
client = phy->i2c_dev;
if (!client || irq != client->irq)
goto exit_irq_none;
info = nci_get_drvdata(phy->ndev);
if (!info)
goto exit_irq_none;
mutex_lock(&info->info_lock);
if (phy->hard_fault != 0)
goto exit_irq_handled;
switch (info->mode) {
case NXP_NCI_MODE_NCI:
r = nxp_nci_i2c_nci_read(phy, &skb);
break;
case NXP_NCI_MODE_FW:
r = nxp_nci_i2c_fw_read(phy, &skb);
break;
case NXP_NCI_MODE_COLD:
r = -EREMOTEIO;
break;
}
if (r == -EREMOTEIO) {
phy->hard_fault = r;
if (info->mode == NXP_NCI_MODE_FW)
nxp_nci_fw_recv_frame(phy->ndev, NULL);
}
if (r < 0) {
nfc_err(&client->dev, "Read failed with error %d\n", r);
goto exit_irq_handled;
}
switch (info->mode) {
case NXP_NCI_MODE_NCI:
nci_recv_frame(phy->ndev, skb);
break;
case NXP_NCI_MODE_FW:
nxp_nci_fw_recv_frame(phy->ndev, skb);
break;
case NXP_NCI_MODE_COLD:
break;
}
exit_irq_handled:
mutex_unlock(&info->info_lock);
return IRQ_HANDLED;
exit_irq_none:
WARN_ON_ONCE(1);
return IRQ_NONE;
}
static const struct acpi_gpio_params firmware_gpios = { 1, 0, false };
static const struct acpi_gpio_params enable_gpios = { 2, 0, false };
static const struct acpi_gpio_mapping acpi_nxp_nci_gpios[] = {
{ "enable-gpios", &enable_gpios, 1 },
{ "firmware-gpios", &firmware_gpios, 1 },
{ }
};
static int nxp_nci_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct nxp_nci_i2c_phy *phy;
int r;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
return -ENODEV;
}
phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),
GFP_KERNEL);
if (!phy)
return -ENOMEM;
phy->i2c_dev = client;
i2c_set_clientdata(client, phy);
r = devm_acpi_dev_add_driver_gpios(dev, acpi_nxp_nci_gpios);
if (r)
dev_dbg(dev, "Unable to add GPIO mapping table\n");
phy->gpiod_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(phy->gpiod_en)) {
nfc_err(dev, "Failed to get EN gpio\n");
return PTR_ERR(phy->gpiod_en);
}
phy->gpiod_fw = devm_gpiod_get_optional(dev, "firmware", GPIOD_OUT_LOW);
if (IS_ERR(phy->gpiod_fw)) {
nfc_err(dev, "Failed to get FW gpio\n");
return PTR_ERR(phy->gpiod_fw);
}
r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
if (r < 0)
return r;
r = request_threaded_irq(client->irq, NULL,
nxp_nci_i2c_irq_thread_fn,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
NXP_NCI_I2C_DRIVER_NAME, phy);
if (r < 0)
nfc_err(&client->dev, "Unable to register IRQ handler\n");
return r;
}
static void nxp_nci_i2c_remove(struct i2c_client *client)
{
struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
nxp_nci_remove(phy->ndev);
free_irq(client->irq, phy);
}
static const struct i2c_device_id nxp_nci_i2c_id_table[] = {
{"nxp-nci_i2c", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, nxp_nci_i2c_id_table);
static const struct of_device_id of_nxp_nci_i2c_match[] = {
{ .compatible = "nxp,nxp-nci-i2c", },
{}
};
MODULE_DEVICE_TABLE(of, of_nxp_nci_i2c_match);
#ifdef CONFIG_ACPI
static const struct acpi_device_id acpi_id[] = {
{ "NXP1001" },
{ "NXP7471" },
{ }
};
MODULE_DEVICE_TABLE(acpi, acpi_id);
#endif
static struct i2c_driver nxp_nci_i2c_driver = {
.driver = {
.name = NXP_NCI_I2C_DRIVER_NAME,
.acpi_match_table = ACPI_PTR(acpi_id),
.of_match_table = of_nxp_nci_i2c_match,
},
.probe = nxp_nci_i2c_probe,
.id_table = nxp_nci_i2c_id_table,
.remove = nxp_nci_i2c_remove,
};
module_i2c_driver(nxp_nci_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");
MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
MODULE_AUTHOR("Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>");
|