[deliverable/linux.git] / drivers / nfc / nxp-nci / i2c.c

/*
 * 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.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <linux/gpio/consumer.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/platform_data/nxp-nci.h>
#include <linux/unaligned/access_ok.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;

	unsigned int gpio_en;
	unsigned int gpio_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;

	gpio_set_value(phy->gpio_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
	gpio_set_value(phy->gpio_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 */
		usleep_range(110000, 120000);
		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 = (get_unaligned_be16(&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;
	}

	memcpy(skb_put(*skb, NXP_NCI_FW_HDR_LEN), &header, NXP_NCI_FW_HDR_LEN);

	r = i2c_master_recv(client, skb_put(*skb, frame_len), frame_len);
	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;
	}

	memcpy(skb_put(*skb, NCI_CTRL_HDR_SIZE), (void *) &header,
	       NCI_CTRL_HDR_SIZE);

	r = i2c_master_recv(client, skb_put(*skb, header.plen), header.plen);
	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;
		skb = NULL;
	} else 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 int nxp_nci_i2c_parse_devtree(struct i2c_client *client)
{
	struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
	struct device_node *pp;
	int r;

	pp = client->dev.of_node;
	if (!pp)
		return -ENODEV;

	r = of_get_named_gpio(pp, "enable-gpios", 0);
	if (r == -EPROBE_DEFER)
		r = of_get_named_gpio(pp, "enable-gpios", 0);
	if (r < 0) {
		nfc_err(&client->dev, "Failed to get EN gpio, error: %d\n", r);
		return r;
	}
	phy->gpio_en = r;

	r = of_get_named_gpio(pp, "firmware-gpios", 0);
	if (r == -EPROBE_DEFER)
		r = of_get_named_gpio(pp, "firmware-gpios", 0);
	if (r < 0) {
		nfc_err(&client->dev, "Failed to get FW gpio, error: %d\n", r);
		return r;
	}
	phy->gpio_fw = r;

	return 0;
}

static int nxp_nci_i2c_acpi_config(struct nxp_nci_i2c_phy *phy)
{
	struct i2c_client *client = phy->i2c_dev;
	struct gpio_desc *gpiod_en, *gpiod_fw;

	gpiod_en = devm_gpiod_get_index(&client->dev, NULL, 2, GPIOD_OUT_LOW);
	gpiod_fw = devm_gpiod_get_index(&client->dev, NULL, 1, GPIOD_OUT_LOW);

	if (IS_ERR(gpiod_en) || IS_ERR(gpiod_fw)) {
		nfc_err(&client->dev, "No GPIOs\n");
		return -EINVAL;
	}

	phy->gpio_en = desc_to_gpio(gpiod_en);
	phy->gpio_fw = desc_to_gpio(gpiod_fw);

	return 0;
}

static int nxp_nci_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct nxp_nci_i2c_phy *phy;
	struct nxp_nci_nfc_platform_data *pdata;
	int r;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
		r = -ENODEV;
		goto probe_exit;
	}

	phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),
			   GFP_KERNEL);
	if (!phy) {
		r = -ENOMEM;
		goto probe_exit;
	}

	phy->i2c_dev = client;
	i2c_set_clientdata(client, phy);

	pdata = client->dev.platform_data;

	if (!pdata && client->dev.of_node) {
		r = nxp_nci_i2c_parse_devtree(client);
		if (r < 0) {
			nfc_err(&client->dev, "Failed to get DT data\n");
			goto probe_exit;
		}
	} else if (pdata) {
		phy->gpio_en = pdata->gpio_en;
		phy->gpio_fw = pdata->gpio_fw;
	} else if (ACPI_HANDLE(&client->dev)) {
		r = nxp_nci_i2c_acpi_config(phy);
		if (r < 0)
			goto probe_exit;
		goto nci_probe;
	} else {
		nfc_err(&client->dev, "No platform data\n");
		r = -EINVAL;
		goto probe_exit;
	}

	r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
				  GPIOF_OUT_INIT_LOW, "nxp_nci_en");
	if (r < 0)
		goto probe_exit;

	r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw,
				  GPIOF_OUT_INIT_LOW, "nxp_nci_fw");
	if (r < 0)
		goto probe_exit;

nci_probe:
	r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
			  NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
	if (r < 0)
		goto probe_exit;

	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");

probe_exit:
	return r;
}

static int 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);

	return 0;
}

static 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 struct acpi_device_id acpi_id[] = {
	{ "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_match_ptr(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>");
Commit	Line	Data
6be88670 CP	1	/*
	2	* I2C link layer for the NXP NCI driver
	3	*
	4	* Copyright (C) 2014 NXP Semiconductors All rights reserved.
551e3069	5	* Copyright (C) 2012-2015 Intel Corporation. All rights reserved.
6be88670 CP	6	*
6be88670 CP	7	* Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
551e3069	8	* Authors: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
6be88670 CP	9	*
	10	* Derived from PN544 device driver:
	11	* Copyright (C) 2012 Intel Corporation. All rights reserved.
	12	*
	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.
	16	*
	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.
	21	*
	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/>.
	24	*/
	25
	26	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	27
551e3069	28	#include <linux/acpi.h>
6be88670 CP	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>
262e7198	35	#include <linux/gpio/consumer.h>
6be88670 CP	36	#include <linux/of_gpio.h>
	37	#include <linux/of_irq.h>
	38	#include <linux/platform_data/nxp-nci.h>
	39	#include <linux/unaligned/access_ok.h>
	40
	41	#include <net/nfc/nfc.h>
	42
	43	#include "nxp-nci.h"
	44
	45	#define NXP_NCI_I2C_DRIVER_NAME "nxp-nci_i2c"
	46
	47	#define NXP_NCI_I2C_MAX_PAYLOAD 32
	48
	49	struct nxp_nci_i2c_phy {
	50	struct i2c_client *i2c_dev;
	51	struct nci_dev *ndev;
	52
	53	unsigned int gpio_en;
	54	unsigned int gpio_fw;
	55
	56	int hard_fault; /*
	57	* < 0 if hardware error occurred (e.g. i2c err)
	58	* and prevents normal operation.
	59	*/
	60	};
	61
	62	static int nxp_nci_i2c_set_mode(void *phy_id,
	63	enum nxp_nci_mode mode)
	64	{
	65	struct nxp_nci_i2c_phy phy = (struct nxp_nci_i2c_phy ) phy_id;
	66
	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);
	70
	71	if (mode == NXP_NCI_MODE_COLD)
	72	phy->hard_fault = 0;
	73
	74	return 0;
	75	}
	76
	77	static int nxp_nci_i2c_write(void phy_id, struct sk_buff skb)
	78	{
	79	int r;
	80	struct nxp_nci_i2c_phy *phy = phy_id;
	81	struct i2c_client *client = phy->i2c_dev;
	82
	83	if (phy->hard_fault != 0)
	84	return phy->hard_fault;
	85
	86	r = i2c_master_send(client, skb->data, skb->len);
59df9bb2	87	if (r < 0) {
6be88670 CP	88	/* Retry, chip was in standby */
	89	usleep_range(110000, 120000);
	90	r = i2c_master_send(client, skb->data, skb->len);
	91	}
	92
	93	if (r < 0) {
	94	nfc_err(&client->dev, "Error %d on I2C send\n", r);
	95	} else if (r != skb->len) {
	96	nfc_err(&client->dev,
	97	"Invalid length sent: %u (expected %u)\n",
	98	r, skb->len);
	99	r = -EREMOTEIO;
	100	} else {
	101	/* Success but return 0 and not number of bytes */
	102	r = 0;
	103	}
	104
	105	return r;
	106	}
	107
7cf6d08c	108	static const struct nxp_nci_phy_ops i2c_phy_ops = {
6be88670 CP	109	.set_mode = nxp_nci_i2c_set_mode,
	110	.write = nxp_nci_i2c_write,
	111	};
	112
	113	static int nxp_nci_i2c_fw_read(struct nxp_nci_i2c_phy *phy,
	114	struct sk_buff **skb)
	115	{
	116	struct i2c_client *client = phy->i2c_dev;
	117	u16 header;
	118	size_t frame_len;
	119	int r;
	120
	121	r = i2c_master_recv(client, (u8 *) &header, NXP_NCI_FW_HDR_LEN);
	122	if (r < 0) {
	123	goto fw_read_exit;
	124	} else if (r != NXP_NCI_FW_HDR_LEN) {
	125	nfc_err(&client->dev, "Incorrect header length: %u\n", r);
	126	r = -EBADMSG;
	127	goto fw_read_exit;
	128	}
	129
	130	frame_len = (get_unaligned_be16(&header) & NXP_NCI_FW_FRAME_LEN_MASK) +
	131	NXP_NCI_FW_CRC_LEN;
	132
	133	*skb = alloc_skb(NXP_NCI_FW_HDR_LEN + frame_len, GFP_KERNEL);
	134	if (*skb == NULL) {
	135	r = -ENOMEM;
	136	goto fw_read_exit;
	137	}
	138
	139	memcpy(skb_put(*skb, NXP_NCI_FW_HDR_LEN), &header, NXP_NCI_FW_HDR_LEN);
	140
	141	r = i2c_master_recv(client, skb_put(*skb, frame_len), frame_len);
	142	if (r != frame_len) {
	143	nfc_err(&client->dev,
	144	"Invalid frame length: %u (expected %zu)\n",
	145	r, frame_len);
	146	r = -EBADMSG;
	147	goto fw_read_exit_free_skb;
	148	}
	149
	150	return 0;
	151
	152	fw_read_exit_free_skb:
	153	kfree_skb(*skb);
	154	fw_read_exit:
	155	return r;
	156	}
	157
	158	static int nxp_nci_i2c_nci_read(struct nxp_nci_i2c_phy *phy,
	159	struct sk_buff **skb)
	160	{
	161	struct nci_ctrl_hdr header; /* May actually be a data header */
	162	struct i2c_client *client = phy->i2c_dev;
	163	int r;
	164
	165	r = i2c_master_recv(client, (u8 *) &header, NCI_CTRL_HDR_SIZE);
	166	if (r < 0) {
	167	goto nci_read_exit;
	168	} else if (r != NCI_CTRL_HDR_SIZE) {
	169	nfc_err(&client->dev, "Incorrect header length: %u\n", r);
	170	r = -EBADMSG;
	171	goto nci_read_exit;
	172	}
173
174	*skb = alloc_skb(NCI_CTRL_HDR_SIZE + header.plen, GFP_KERNEL);
175	if (*skb == NULL) {
176	r = -ENOMEM;
177	goto nci_read_exit;
178	}
179
180	memcpy(skb_put(skb, NCI_CTRL_HDR_SIZE), (void ) &header,
181	NCI_CTRL_HDR_SIZE);
182
183	r = i2c_master_recv(client, skb_put(*skb, header.plen), header.plen);
184	if (r != header.plen) {
185	nfc_err(&client->dev,
186	"Invalid frame payload length: %u (expected %u)\n",
187	r, header.plen);
188	r = -EBADMSG;
189	goto nci_read_exit_free_skb;
190	}
191
192	return 0;
193
194	nci_read_exit_free_skb:
195	kfree_skb(*skb);
196	nci_read_exit:
197	return r;
198	}
199
200	static irqreturn_t nxp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
201	{
202	struct nxp_nci_i2c_phy *phy = phy_id;
203	struct i2c_client *client;
204	struct nxp_nci_info *info;
205
206	struct sk_buff *skb = NULL;
207	int r = 0;
208
209	if (!phy \|\| !phy->ndev)
210	goto exit_irq_none;
211
212	client = phy->i2c_dev;
213
214	if (!client \|\| irq != client->irq)
215	goto exit_irq_none;
216
217	info = nci_get_drvdata(phy->ndev);
218
219	if (!info)
220	goto exit_irq_none;
221
222	mutex_lock(&info->info_lock);
223
224	if (phy->hard_fault != 0)
225	goto exit_irq_handled;
226
227	switch (info->mode) {
228	case NXP_NCI_MODE_NCI:
229	r = nxp_nci_i2c_nci_read(phy, &skb);
230	break;
231	case NXP_NCI_MODE_FW:
232	r = nxp_nci_i2c_fw_read(phy, &skb);
233	break;
234	case NXP_NCI_MODE_COLD:
235	r = -EREMOTEIO;
236	break;
237	}
238
239	if (r == -EREMOTEIO) {
240	phy->hard_fault = r;
241	skb = NULL;
242	} else if (r < 0) {
243	nfc_err(&client->dev, "Read failed with error %d\n", r);
244	goto exit_irq_handled;
245	}
246
247	switch (info->mode) {
248	case NXP_NCI_MODE_NCI:
249	nci_recv_frame(phy->ndev, skb);
250	break;
251	case NXP_NCI_MODE_FW:
252	nxp_nci_fw_recv_frame(phy->ndev, skb);
253	break;
254	case NXP_NCI_MODE_COLD:
255	break;
256	}
257
258	exit_irq_handled:
259	mutex_unlock(&info->info_lock);
260	return IRQ_HANDLED;
261	exit_irq_none:
262	WARN_ON_ONCE(1);
263	return IRQ_NONE;
264	}
265
6be88670 CP	266	static int nxp_nci_i2c_parse_devtree(struct i2c_client *client)
	267	{
	268	struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
	269	struct device_node *pp;
	270	int r;
	271
	272	pp = client->dev.of_node;
	273	if (!pp)
	274	return -ENODEV;
	275
	276	r = of_get_named_gpio(pp, "enable-gpios", 0);
	277	if (r == -EPROBE_DEFER)
	278	r = of_get_named_gpio(pp, "enable-gpios", 0);
	279	if (r < 0) {
	280	nfc_err(&client->dev, "Failed to get EN gpio, error: %d\n", r);
	281	return r;
	282	}
	283	phy->gpio_en = r;
	284
	285	r = of_get_named_gpio(pp, "firmware-gpios", 0);
	286	if (r == -EPROBE_DEFER)
	287	r = of_get_named_gpio(pp, "firmware-gpios", 0);
	288	if (r < 0) {
	289	nfc_err(&client->dev, "Failed to get FW gpio, error: %d\n", r);
	290	return r;
	291	}
	292	phy->gpio_fw = r;
	293
6be88670 CP	294	return 0;
	295	}
	296
551e3069 OZ	297	static int nxp_nci_i2c_acpi_config(struct nxp_nci_i2c_phy *phy)
	298	{
	299	struct i2c_client *client = phy->i2c_dev;
be103b71	300	struct gpio_desc gpiod_en, gpiod_fw;
551e3069	301
3bfe7680 UKK	302	gpiod_en = devm_gpiod_get_index(&client->dev, NULL, 2, GPIOD_OUT_LOW);
3bfe7680 UKK	303	gpiod_fw = devm_gpiod_get_index(&client->dev, NULL, 1, GPIOD_OUT_LOW);
551e3069	304
be103b71	305	if (IS_ERR(gpiod_en) \|\| IS_ERR(gpiod_fw)) {
551e3069 OZ	306	nfc_err(&client->dev, "No GPIOs\n");
	307	return -EINVAL;
	308	}
	309
551e3069 OZ	310	phy->gpio_en = desc_to_gpio(gpiod_en);
551e3069 OZ	311	phy->gpio_fw = desc_to_gpio(gpiod_fw);
551e3069 OZ	312
	313	return 0;
	314	}
	315
6be88670 CP	316	static int nxp_nci_i2c_probe(struct i2c_client *client,
	317	const struct i2c_device_id *id)
	318	{
	319	struct nxp_nci_i2c_phy *phy;
	320	struct nxp_nci_nfc_platform_data *pdata;
	321	int r;
	322
	323	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	324	nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
	325	r = -ENODEV;
	326	goto probe_exit;
	327	}
	328
	329	phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),
	330	GFP_KERNEL);
	331	if (!phy) {
	332	r = -ENOMEM;
	333	goto probe_exit;
	334	}
	335
	336	phy->i2c_dev = client;
	337	i2c_set_clientdata(client, phy);
	338
	339	pdata = client->dev.platform_data;
	340
	341	if (!pdata && client->dev.of_node) {
	342	r = nxp_nci_i2c_parse_devtree(client);
	343	if (r < 0) {
	344	nfc_err(&client->dev, "Failed to get DT data\n");
	345	goto probe_exit;
	346	}
	347	} else if (pdata) {
	348	phy->gpio_en = pdata->gpio_en;
	349	phy->gpio_fw = pdata->gpio_fw;
551e3069 OZ	350	} else if (ACPI_HANDLE(&client->dev)) {
	351	r = nxp_nci_i2c_acpi_config(phy);
	352	if (r < 0)
	353	goto probe_exit;
	354	goto nci_probe;
6be88670 CP	355	} else {
	356	nfc_err(&client->dev, "No platform data\n");
	357	r = -EINVAL;
	358	goto probe_exit;
	359	}
	360
	361	r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
	362	GPIOF_OUT_INIT_LOW, "nxp_nci_en");
	363	if (r < 0)
	364	goto probe_exit;
	365
	366	r = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw,
	367	GPIOF_OUT_INIT_LOW, "nxp_nci_fw");
	368	if (r < 0)
	369	goto probe_exit;
	370
551e3069	371	nci_probe:
6be88670 CP	372	r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,
	373	NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);
	374	if (r < 0)
	375	goto probe_exit;
	376
	377	r = request_threaded_irq(client->irq, NULL,
	378	nxp_nci_i2c_irq_thread_fn,
	379	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	380	NXP_NCI_I2C_DRIVER_NAME, phy);
	381	if (r < 0)
	382	nfc_err(&client->dev, "Unable to register IRQ handler\n");
	383
	384	probe_exit:
	385	return r;
	386	}
	387
	388	static int nxp_nci_i2c_remove(struct i2c_client *client)
	389	{
	390	struct nxp_nci_i2c_phy *phy = i2c_get_clientdata(client);
	391
	392	nxp_nci_remove(phy->ndev);
	393	free_irq(client->irq, phy);
	394
	395	return 0;
	396	}
	397
	398	static struct i2c_device_id nxp_nci_i2c_id_table[] = {
	399	{"nxp-nci_i2c", 0},
	400	{}
	401	};
	402	MODULE_DEVICE_TABLE(i2c, nxp_nci_i2c_id_table);
	403
	404	static const struct of_device_id of_nxp_nci_i2c_match[] = {
	405	{ .compatible = "nxp,nxp-nci-i2c", },
	406	{},
	407	};
	408	MODULE_DEVICE_TABLE(of, of_nxp_nci_i2c_match);
	409
551e3069 OZ	410	#ifdef CONFIG_ACPI
	411	static struct acpi_device_id acpi_id[] = {
	412	{ "NXP7471" },
	413	{ },
	414	};
	415	MODULE_DEVICE_TABLE(acpi, acpi_id);
	416	#endif
	417
6be88670 CP	418	static struct i2c_driver nxp_nci_i2c_driver = {
	419	.driver = {
	420	.name = NXP_NCI_I2C_DRIVER_NAME,
551e3069	421	.acpi_match_table = ACPI_PTR(acpi_id),
6be88670 CP	422	.of_match_table = of_match_ptr(of_nxp_nci_i2c_match),
	423	},
	424	.probe = nxp_nci_i2c_probe,
	425	.id_table = nxp_nci_i2c_id_table,
	426	.remove = nxp_nci_i2c_remove,
	427	};
	428
	429	module_i2c_driver(nxp_nci_i2c_driver);
	430
	431	MODULE_LICENSE("GPL");
	432	MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");
	433	MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
551e3069	434	MODULE_AUTHOR("Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>");