2 * I2C link layer for the NXP NCI driver
4 * Copyright (C) 2014 NXP Semiconductors All rights reserved.
5 * Copyright (C) 2012-2015 Intel Corporation. All rights reserved.
7 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
8 * Authors: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
10 * Derived from PN544 device driver:
11 * Copyright (C) 2012 Intel Corporation. All rights reserved.
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms and conditions of the GNU General Public License,
15 * version 2, as published by the Free Software Foundation.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <http://www.gnu.org/licenses/>.
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/acpi.h>
29 #include <linux/delay.h>
30 #include <linux/i2c.h>
31 #include <linux/interrupt.h>
32 #include <linux/miscdevice.h>
33 #include <linux/module.h>
34 #include <linux/nfc.h>
35 #include <linux/gpio/consumer.h>
36 #include <linux/of_gpio.h>
37 #include <linux/of_irq.h>
38 #include <linux/platform_data/nxp-nci.h>
39 #include <asm/unaligned.h>
41 #include <net/nfc/nfc.h>
45 #define NXP_NCI_I2C_DRIVER_NAME "nxp-nci_i2c"
47 #define NXP_NCI_I2C_MAX_PAYLOAD 32
49 struct nxp_nci_i2c_phy {
50 struct i2c_client *i2c_dev;
57 * < 0 if hardware error occurred (e.g. i2c err)
58 * and prevents normal operation.
62 static int nxp_nci_i2c_set_mode(void *phy_id,
63 enum nxp_nci_mode mode)
65 struct nxp_nci_i2c_phy *phy = (struct nxp_nci_i2c_phy *) phy_id;
67 gpio_set_value(phy->gpio_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
68 gpio_set_value(phy->gpio_en, (mode != NXP_NCI_MODE_COLD) ? 1 : 0);
69 usleep_range(10000, 15000);
71 if (mode == NXP_NCI_MODE_COLD)
77 static int nxp_nci_i2c_write(void *phy_id, struct sk_buff *skb)
80 struct nxp_nci_i2c_phy *phy = phy_id;
81 struct i2c_client *client = phy->i2c_dev;
83 if (phy->hard_fault != 0)
84 return phy->hard_fault;
86 r = i2c_master_send(client, skb->data, skb->len);
88 /* Retry, chip was in standby */
89 usleep_range(110000, 120000);
90 r = i2c_master_send(client, skb->data, skb->len);
94 nfc_err(&client->dev, "Error %d on I2C send\n", r);
95 } else if (r != skb->len) {
97 "Invalid length sent: %u (expected %u)\n",
101 /* Success but return 0 and not number of bytes */
108 static const struct nxp_nci_phy_ops i2c_phy_ops = {
109 .set_mode = nxp_nci_i2c_set_mode,
110 .write = nxp_nci_i2c_write,
113 static int nxp_nci_i2c_fw_read(struct nxp_nci_i2c_phy *phy,
114 struct sk_buff **skb)
116 struct i2c_client *client = phy->i2c_dev;
121 r = i2c_master_recv(client, (u8 *) &header, NXP_NCI_FW_HDR_LEN);
124 } else if (r != NXP_NCI_FW_HDR_LEN) {
125 nfc_err(&client->dev, "Incorrect header length: %u\n", r);
130 frame_len = (get_unaligned_be16(&header) & NXP_NCI_FW_FRAME_LEN_MASK) +
133 *skb = alloc_skb(NXP_NCI_FW_HDR_LEN + frame_len, GFP_KERNEL);
139 memcpy(skb_put(*skb, NXP_NCI_FW_HDR_LEN), &header, NXP_NCI_FW_HDR_LEN);
141 r = i2c_master_recv(client, skb_put(*skb, frame_len), frame_len);
143 goto fw_read_exit_free_skb;
144 } else if (r != frame_len) {
145 nfc_err(&client->dev,
146 "Invalid frame length: %u (expected %zu)\n",
149 goto fw_read_exit_free_skb;
154 fw_read_exit_free_skb:
160 static int nxp_nci_i2c_nci_read(struct nxp_nci_i2c_phy *phy,
161 struct sk_buff **skb)
163 struct nci_ctrl_hdr header; /* May actually be a data header */
164 struct i2c_client *client = phy->i2c_dev;
167 r = i2c_master_recv(client, (u8 *) &header, NCI_CTRL_HDR_SIZE);
170 } else if (r != NCI_CTRL_HDR_SIZE) {
171 nfc_err(&client->dev, "Incorrect header length: %u\n", r);
176 *skb = alloc_skb(NCI_CTRL_HDR_SIZE + header.plen, GFP_KERNEL);
182 memcpy(skb_put(*skb, NCI_CTRL_HDR_SIZE), (void *) &header,
188 r = i2c_master_recv(client, skb_put(*skb, header.plen), header.plen);
190 goto nci_read_exit_free_skb;
191 } else if (r != header.plen) {
192 nfc_err(&client->dev,
193 "Invalid frame payload length: %u (expected %u)\n",
196 goto nci_read_exit_free_skb;
201 nci_read_exit_free_skb:
207 static irqreturn_t nxp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
209 struct nxp_nci_i2c_phy *phy = phy_id;
210 struct i2c_client *client;
211 struct nxp_nci_info *info;
213 struct sk_buff *skb = NULL;
216 if (!phy || !phy->ndev)
219 client = phy->i2c_dev;
221 if (!client || irq != client->irq)
224 info = nci_get_drvdata(phy->ndev);
229 mutex_lock(&info->info_lock);
231 if (phy->hard_fault != 0)
232 goto exit_irq_handled;
234 switch (info->mode) {
235 case NXP_NCI_MODE_NCI:
236 r = nxp_nci_i2c_nci_read(phy, &skb);
238 case NXP_NCI_MODE_FW:
239 r = nxp_nci_i2c_fw_read(phy, &skb);
241 case NXP_NCI_MODE_COLD:
246 if (r == -EREMOTEIO) {
248 if (info->mode == NXP_NCI_MODE_FW)
249 nxp_nci_fw_recv_frame(phy->ndev, NULL);
252 nfc_err(&client->dev, "Read failed with error %d\n", r);
253 goto exit_irq_handled;
256 switch (info->mode) {
257 case NXP_NCI_MODE_NCI:
258 nci_recv_frame(phy->ndev, skb);
260 case NXP_NCI_MODE_FW:
261 nxp_nci_fw_recv_frame(phy->ndev, skb);
263 case NXP_NCI_MODE_COLD:
268 mutex_unlock(&info->info_lock);
275 static int nxp_nci_i2c_parse_devtree(struct i2c_client *client)
277 struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
278 struct device_node *pp;
281 pp = client->dev.of_node;
285 r = of_get_named_gpio(pp, "enable-gpios", 0);
286 if (r == -EPROBE_DEFER)
287 r = of_get_named_gpio(pp, "enable-gpios", 0);
289 nfc_err(&client->dev, "Failed to get EN gpio, error: %d\n", r);
294 r = of_get_named_gpio(pp, "firmware-gpios", 0);
295 if (r == -EPROBE_DEFER)
296 r = of_get_named_gpio(pp, "firmware-gpios", 0);
298 nfc_err(&client->dev, "Failed to get FW gpio, error: %d\n", r);
306 static int nxp_nci_i2c_acpi_config(struct nxp_nci_i2c_phy *phy)
308 struct i2c_client *client = phy->i2c_dev;
309 struct gpio_desc *gpiod_en, *gpiod_fw;
311 gpiod_en = devm_gpiod_get_index(&client->dev, NULL, 2, GPIOD_OUT_LOW);
312 gpiod_fw = devm_gpiod_get_index(&client->dev, NULL, 1, GPIOD_OUT_LOW);
314 if (IS_ERR(gpiod_en) || IS_ERR(gpiod_fw)) {
315 nfc_err(&client->dev, "No GPIOs\n");
319 phy->gpio_en = desc_to_gpio(gpiod_en);
320 phy->gpio_fw = desc_to_gpio(gpiod_fw);
325 static int nxp_nci_i2c_probe(struct i2c_client *client,
326 const struct i2c_device_id *id)
328 struct nxp_nci_i2c_phy *phy;
329 struct nxp_nci_nfc_platform_data *pdata;
332 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
333 nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
338 phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),
345 phy->i2c_dev = client;
346 i2c_set_clientdata(client, phy);
348 pdata = client->dev.platform_data;
350 if (!pdata && client->dev.of_node) {
351 r = nxp_nci_i2c_parse_devtree(client);
353 nfc_err(&client->dev, "Failed to get DT data\n");
357 phy->gpio_en = pdata->gpio_en;
358 phy->gpio_fw = pdata->gpio_fw;
359 } else if (ACPI_HANDLE(&client->dev)) {
360 r = nxp_nci_i2c_acpi_config(phy);
365 nfc_err(&client->dev, "No platform data\n");
370 r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
371 GPIOF_OUT_INIT_LOW, "nxp_nci_en");
375 r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw,
376 GPIOF_OUT_INIT_LOW, "nxp_nci_fw");
381 r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
382 NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
386 r = request_threaded_irq(client->irq, NULL,
387 nxp_nci_i2c_irq_thread_fn,
388 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
389 NXP_NCI_I2C_DRIVER_NAME, phy);
391 nfc_err(&client->dev, "Unable to register IRQ handler\n");
397 static int nxp_nci_i2c_remove(struct i2c_client *client)
399 struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
401 nxp_nci_remove(phy->ndev);
402 free_irq(client->irq, phy);
407 static struct i2c_device_id nxp_nci_i2c_id_table[] = {
411 MODULE_DEVICE_TABLE(i2c, nxp_nci_i2c_id_table);
413 static const struct of_device_id of_nxp_nci_i2c_match[] = {
414 { .compatible = "nxp,nxp-nci-i2c", },
417 MODULE_DEVICE_TABLE(of, of_nxp_nci_i2c_match);
420 static struct acpi_device_id acpi_id[] = {
424 MODULE_DEVICE_TABLE(acpi, acpi_id);
427 static struct i2c_driver nxp_nci_i2c_driver = {
429 .name = NXP_NCI_I2C_DRIVER_NAME,
430 .acpi_match_table = ACPI_PTR(acpi_id),
431 .of_match_table = of_match_ptr(of_nxp_nci_i2c_match),
433 .probe = nxp_nci_i2c_probe,
434 .id_table = nxp_nci_i2c_id_table,
435 .remove = nxp_nci_i2c_remove,
438 module_i2c_driver(nxp_nci_i2c_driver);
440 MODULE_LICENSE("GPL");
441 MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");
442 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
443 MODULE_AUTHOR("Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>");