[mirror_ubuntu-jammy-kernel.git] / drivers / nfc / st-nci / spi.c

/*
 * SPI Link Layer for ST NCI based Driver
 * Copyright (C) 2014-2015 STMicroelectronics SAS. 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/module.h>
#include <linux/spi/spi.h>
#include <linux/gpio/consumer.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/nfc.h>
#include <linux/of.h>
#include <net/nfc/nci.h>

#include "st-nci.h"

#define DRIVER_DESC "NCI NFC driver for ST_NCI"

/* ndlc header */
#define ST_NCI_FRAME_HEADROOM	1
#define ST_NCI_FRAME_TAILROOM	0

#define ST_NCI_SPI_MIN_SIZE 4   /* PCB(1) + NCI Packet header(3) */
#define ST_NCI_SPI_MAX_SIZE 250 /* req 4.2.1 */

#define ST_NCI_DRIVER_NAME "st_nci"
#define ST_NCI_SPI_DRIVER_NAME "st_nci_spi"

#define ST_NCI_GPIO_NAME_RESET "reset"

struct st_nci_spi_phy {
	struct spi_device *spi_dev;
	struct llt_ndlc *ndlc;

	bool irq_active;

	struct gpio_desc *gpiod_reset;

	struct st_nci_se_status se_status;
};

static int st_nci_spi_enable(void *phy_id)
{
	struct st_nci_spi_phy *phy = phy_id;

	gpiod_set_value(phy->gpiod_reset, 0);
	usleep_range(10000, 15000);
	gpiod_set_value(phy->gpiod_reset, 1);
	usleep_range(80000, 85000);

	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
		enable_irq(phy->spi_dev->irq);
		phy->irq_active = true;
	}

	return 0;
}

static void st_nci_spi_disable(void *phy_id)
{
	struct st_nci_spi_phy *phy = phy_id;

	disable_irq_nosync(phy->spi_dev->irq);
	phy->irq_active = false;
}

/*
 * Writing a frame must not return the number of written bytes.
 * It must return either zero for success, or <0 for error.
 * In addition, it must not alter the skb
 */
static int st_nci_spi_write(void *phy_id, struct sk_buff *skb)
{
	int r;
	struct st_nci_spi_phy *phy = phy_id;
	struct spi_device *dev = phy->spi_dev;
	struct sk_buff *skb_rx;
	u8 buf[ST_NCI_SPI_MAX_SIZE + NCI_DATA_HDR_SIZE +
	       ST_NCI_FRAME_HEADROOM + ST_NCI_FRAME_TAILROOM];
	struct spi_transfer spi_xfer = {
		.tx_buf = skb->data,
		.rx_buf = buf,
		.len = skb->len,
	};

	if (phy->ndlc->hard_fault != 0)
		return phy->ndlc->hard_fault;

	r = spi_sync_transfer(dev, &spi_xfer, 1);
	/*
	 * We may have received some valuable data on miso line.
	 * Send them back in the ndlc state machine.
	 */
	if (!r) {
		skb_rx = alloc_skb(skb->len, GFP_KERNEL);
		if (!skb_rx) {
			r = -ENOMEM;
			goto exit;
		}

		skb_put(skb_rx, skb->len);
		memcpy(skb_rx->data, buf, skb->len);
		ndlc_recv(phy->ndlc, skb_rx);
	}

exit:
	return r;
}

/*
 * Reads an ndlc frame and returns it in a newly allocated sk_buff.
 * returns:
 * 0 : if received frame is complete
 * -EREMOTEIO : i2c read error (fatal)
 * -EBADMSG : frame was incorrect and discarded
 * -ENOMEM : cannot allocate skb, frame dropped
 */
static int st_nci_spi_read(struct st_nci_spi_phy *phy,
			struct sk_buff **skb)
{
	int r;
	u8 len;
	u8 buf[ST_NCI_SPI_MAX_SIZE];
	struct spi_device *dev = phy->spi_dev;
	struct spi_transfer spi_xfer = {
		.rx_buf = buf,
		.len = ST_NCI_SPI_MIN_SIZE,
	};

	r = spi_sync_transfer(dev, &spi_xfer, 1);
	if (r < 0)
		return -EREMOTEIO;

	len = be16_to_cpu(*(__be16 *) (buf + 2));
	if (len > ST_NCI_SPI_MAX_SIZE) {
		nfc_err(&dev->dev, "invalid frame len\n");
		phy->ndlc->hard_fault = 1;
		return -EBADMSG;
	}

	*skb = alloc_skb(ST_NCI_SPI_MIN_SIZE + len, GFP_KERNEL);
	if (*skb == NULL)
		return -ENOMEM;

	skb_reserve(*skb, ST_NCI_SPI_MIN_SIZE);
	skb_put(*skb, ST_NCI_SPI_MIN_SIZE);
	memcpy((*skb)->data, buf, ST_NCI_SPI_MIN_SIZE);

	if (!len)
		return 0;

	spi_xfer.len = len;
	r = spi_sync_transfer(dev, &spi_xfer, 1);
	if (r < 0) {
		kfree_skb(*skb);
		return -EREMOTEIO;
	}

	skb_put(*skb, len);
	memcpy((*skb)->data + ST_NCI_SPI_MIN_SIZE, buf, len);

	return 0;
}

/*
 * Reads an ndlc frame from the chip.
 *
 * On ST21NFCB, IRQ goes in idle state when read starts.
 */
static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
{
	struct st_nci_spi_phy *phy = phy_id;
	struct spi_device *dev;
	struct sk_buff *skb = NULL;
	int r;

	if (!phy || !phy->ndlc || irq != phy->spi_dev->irq) {
		WARN_ON_ONCE(1);
		return IRQ_NONE;
	}

	dev = phy->spi_dev;
	dev_dbg(&dev->dev, "IRQ\n");

	if (phy->ndlc->hard_fault)
		return IRQ_HANDLED;

	if (!phy->ndlc->powered) {
		st_nci_spi_disable(phy);
		return IRQ_HANDLED;
	}

	r = st_nci_spi_read(phy, &skb);
	if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)
		return IRQ_HANDLED;

	ndlc_recv(phy->ndlc, skb);

	return IRQ_HANDLED;
}

static struct nfc_phy_ops spi_phy_ops = {
	.write = st_nci_spi_write,
	.enable = st_nci_spi_enable,
	.disable = st_nci_spi_disable,
};

static int st_nci_spi_acpi_request_resources(struct spi_device *spi_dev)
{
	struct st_nci_spi_phy *phy = spi_get_drvdata(spi_dev);
	struct device *dev = &spi_dev->dev;

	/* Get RESET GPIO from ACPI */
	phy->gpiod_reset = devm_gpiod_get_index(dev, ST_NCI_GPIO_NAME_RESET,
						1, GPIOD_OUT_HIGH);
	if (IS_ERR(phy->gpiod_reset)) {
		nfc_err(dev, "Unable to get RESET GPIO\n");
		return PTR_ERR(phy->gpiod_reset);
	}

	return 0;
}

static int st_nci_spi_of_request_resources(struct spi_device *spi)
{
	struct st_nci_spi_phy *phy = spi_get_drvdata(spi);
	struct device *dev = &spi->dev;

	/* Get GPIO from device tree */
	phy->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(phy->gpiod_reset)) {
		nfc_err(dev, "Unable to get RESET GPIO\n");
		return PTR_ERR(phy->gpiod_reset);
	}

	return 0;
}

static int st_nci_spi_probe(struct spi_device *dev)
{
	struct st_nci_spi_phy *phy;
	int r;

	dev_dbg(&dev->dev, "%s\n", __func__);
	dev_dbg(&dev->dev, "IRQ: %d\n", dev->irq);

	/* Check SPI platform functionnalities */
	if (!dev) {
		pr_debug("%s: dev is NULL. Device is not accessible.\n",
			__func__);
		return -ENODEV;
	}

	phy = devm_kzalloc(&dev->dev, sizeof(struct st_nci_spi_phy),
			   GFP_KERNEL);
	if (!phy)
		return -ENOMEM;

	phy->spi_dev = dev;

	spi_set_drvdata(dev, phy);

	if (dev->dev.of_node) {
		r = st_nci_spi_of_request_resources(dev);
		if (r) {
			nfc_err(&dev->dev, "No platform data\n");
			return r;
		}
	} else if (ACPI_HANDLE(&dev->dev)) {
		r = st_nci_spi_acpi_request_resources(dev);
		if (r) {
			nfc_err(&dev->dev, "Cannot get ACPI data\n");
			return r;
		}
	} else {
		nfc_err(&dev->dev,
			"st_nci platform resources not available\n");
		return -ENODEV;
	}

	phy->se_status.is_ese_present =
			device_property_read_bool(&dev->dev, "ese-present");
	phy->se_status.is_uicc_present =
			device_property_read_bool(&dev->dev, "uicc-present");

	r = ndlc_probe(phy, &spi_phy_ops, &dev->dev,
			ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
			&phy->ndlc, &phy->se_status);
	if (r < 0) {
		nfc_err(&dev->dev, "Unable to register ndlc layer\n");
		return r;
	}

	phy->irq_active = true;
	r = devm_request_threaded_irq(&dev->dev, dev->irq, NULL,
				st_nci_irq_thread_fn,
				IRQF_ONESHOT,
				ST_NCI_SPI_DRIVER_NAME, phy);
	if (r < 0)
		nfc_err(&dev->dev, "Unable to register IRQ handler\n");

	return r;
}

static int st_nci_spi_remove(struct spi_device *dev)
{
	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);

	dev_dbg(&dev->dev, "%s\n", __func__);

	ndlc_remove(phy->ndlc);

	return 0;
}

static struct spi_device_id st_nci_spi_id_table[] = {
	{ST_NCI_SPI_DRIVER_NAME, 0},
	{}
};
MODULE_DEVICE_TABLE(spi, st_nci_spi_id_table);

static const struct acpi_device_id st_nci_spi_acpi_match[] = {
	{"SMO2101", 0},
	{}
};
MODULE_DEVICE_TABLE(acpi, st_nci_spi_acpi_match);

static const struct of_device_id of_st_nci_spi_match[] = {
	{ .compatible = "st,st21nfcb-spi", },
	{}
};
MODULE_DEVICE_TABLE(of, of_st_nci_spi_match);

static struct spi_driver st_nci_spi_driver = {
	.driver = {
		.name = ST_NCI_SPI_DRIVER_NAME,
		.of_match_table = of_match_ptr(of_st_nci_spi_match),
		.acpi_match_table = ACPI_PTR(st_nci_spi_acpi_match),
	},
	.probe = st_nci_spi_probe,
	.id_table = st_nci_spi_id_table,
	.remove = st_nci_spi_remove,
};
module_spi_driver(st_nci_spi_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);
Commit	Line	Data
2bc4d4f8 CR	1	/*
	2	* SPI Link Layer for ST NCI based Driver
	3	* Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	19
	20	#include <linux/module.h>
	21	#include <linux/spi/spi.h>
60cd6d89	22	#include <linux/gpio/consumer.h>
60cd6d89	23	#include <linux/acpi.h>
2bc4d4f8 CR	24	#include <linux/interrupt.h>
	25	#include <linux/delay.h>
	26	#include <linux/nfc.h>
a89e68f1	27	#include <linux/of.h>
a1269dd1	28	#include <net/nfc/nci.h>
2bc4d4f8	29
e67e7e59	30	#include "st-nci.h"
2bc4d4f8 CR	31
	32	#define DRIVER_DESC "NCI NFC driver for ST_NCI"
	33
	34	/* ndlc header */
	35	#define ST_NCI_FRAME_HEADROOM 1
ba2c231c	36	#define ST_NCI_FRAME_TAILROOM 0
2bc4d4f8 CR	37
	38	#define ST_NCI_SPI_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
	39	#define ST_NCI_SPI_MAX_SIZE 250 /* req 4.2.1 */
	40
61a04101	41	#define ST_NCI_DRIVER_NAME "st_nci"
2bc4d4f8 CR	42	#define ST_NCI_SPI_DRIVER_NAME "st_nci_spi"
2bc4d4f8 CR	43
de72dbc5	44	#define ST_NCI_GPIO_NAME_RESET "reset"
4c62c208	45
2bc4d4f8 CR	46	struct st_nci_spi_phy {
	47	struct spi_device *spi_dev;
	48	struct llt_ndlc *ndlc;
	49
bb2496c3 CR	50	bool irq_active;
bb2496c3 CR	51
a89e68f1	52	struct gpio_desc *gpiod_reset;
3648dc6d CR	53
3648dc6d CR	54	struct st_nci_se_status se_status;
2bc4d4f8 CR	55	};
2bc4d4f8 CR	56
2bc4d4f8 CR	57	static int st_nci_spi_enable(void *phy_id)
	58	{
	59	struct st_nci_spi_phy *phy = phy_id;
	60
a89e68f1	61	gpiod_set_value(phy->gpiod_reset, 0);
2bc4d4f8	62	usleep_range(10000, 15000);
a89e68f1	63	gpiod_set_value(phy->gpiod_reset, 1);
2bc4d4f8 CR	64	usleep_range(80000, 85000);
2bc4d4f8 CR	65
bb2496c3	66	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
2bc4d4f8	67	enable_irq(phy->spi_dev->irq);
bb2496c3 CR	68	phy->irq_active = true;
bb2496c3 CR	69	}
2bc4d4f8 CR	70
	71	return 0;
	72	}
	73
	74	static void st_nci_spi_disable(void *phy_id)
	75	{
	76	struct st_nci_spi_phy *phy = phy_id;
	77
	78	disable_irq_nosync(phy->spi_dev->irq);
bb2496c3	79	phy->irq_active = false;
2bc4d4f8 CR	80	}
	81
	82	/*
	83	* Writing a frame must not return the number of written bytes.
	84	* It must return either zero for success, or <0 for error.
	85	* In addition, it must not alter the skb
	86	*/
	87	static int st_nci_spi_write(void phy_id, struct sk_buff skb)
	88	{
	89	int r;
	90	struct st_nci_spi_phy *phy = phy_id;
	91	struct spi_device *dev = phy->spi_dev;
	92	struct sk_buff *skb_rx;
a1269dd1 CR	93	u8 buf[ST_NCI_SPI_MAX_SIZE + NCI_DATA_HDR_SIZE +
a1269dd1 CR	94	ST_NCI_FRAME_HEADROOM + ST_NCI_FRAME_TAILROOM];
2bc4d4f8 CR	95	struct spi_transfer spi_xfer = {
	96	.tx_buf = skb->data,
	97	.rx_buf = buf,
	98	.len = skb->len,
	99	};
	100
2bc4d4f8 CR	101	if (phy->ndlc->hard_fault != 0)
	102	return phy->ndlc->hard_fault;
	103
	104	r = spi_sync_transfer(dev, &spi_xfer, 1);
	105	/*
	106	* We may have received some valuable data on miso line.
	107	* Send them back in the ndlc state machine.
	108	*/
	109	if (!r) {
	110	skb_rx = alloc_skb(skb->len, GFP_KERNEL);
	111	if (!skb_rx) {
	112	r = -ENOMEM;
	113	goto exit;
	114	}
	115
	116	skb_put(skb_rx, skb->len);
	117	memcpy(skb_rx->data, buf, skb->len);
	118	ndlc_recv(phy->ndlc, skb_rx);
	119	}
	120
	121	exit:
	122	return r;
	123	}
	124
	125	/*
	126	* Reads an ndlc frame and returns it in a newly allocated sk_buff.
	127	* returns:
	128	* 0 : if received frame is complete
	129	* -EREMOTEIO : i2c read error (fatal)
	130	* -EBADMSG : frame was incorrect and discarded
	131	* -ENOMEM : cannot allocate skb, frame dropped
	132	*/
	133	static int st_nci_spi_read(struct st_nci_spi_phy *phy,
	134	struct sk_buff **skb)
	135	{
	136	int r;
	137	u8 len;
	138	u8 buf[ST_NCI_SPI_MAX_SIZE];
	139	struct spi_device *dev = phy->spi_dev;
	140	struct spi_transfer spi_xfer = {
	141	.rx_buf = buf,
	142	.len = ST_NCI_SPI_MIN_SIZE,
	143	};
	144
	145	r = spi_sync_transfer(dev, &spi_xfer, 1);
	146	if (r < 0)
	147	return -EREMOTEIO;
	148
	149	len = be16_to_cpu((__be16 ) (buf + 2));
	150	if (len > ST_NCI_SPI_MAX_SIZE) {
	151	nfc_err(&dev->dev, "invalid frame len\n");
	152	phy->ndlc->hard_fault = 1;
	153	return -EBADMSG;
	154	}
	155
	156	*skb = alloc_skb(ST_NCI_SPI_MIN_SIZE + len, GFP_KERNEL);
	157	if (*skb == NULL)
	158	return -ENOMEM;
	159
	160	skb_reserve(*skb, ST_NCI_SPI_MIN_SIZE);
	161	skb_put(*skb, ST_NCI_SPI_MIN_SIZE);
	162	memcpy((*skb)->data, buf, ST_NCI_SPI_MIN_SIZE);
	163
	164	if (!len)
165	return 0;
166
167	spi_xfer.len = len;
168	r = spi_sync_transfer(dev, &spi_xfer, 1);
169	if (r < 0) {
170	kfree_skb(*skb);
171	return -EREMOTEIO;
172	}
173
174	skb_put(*skb, len);
175	memcpy((*skb)->data + ST_NCI_SPI_MIN_SIZE, buf, len);
176
2bc4d4f8 CR	177	return 0;
	178	}
	179
	180	/*
	181	* Reads an ndlc frame from the chip.
	182	*
	183	* On ST21NFCB, IRQ goes in idle state when read starts.
	184	*/
	185	static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
	186	{
	187	struct st_nci_spi_phy *phy = phy_id;
	188	struct spi_device *dev;
	189	struct sk_buff *skb = NULL;
	190	int r;
	191
	192	if (!phy \|\| !phy->ndlc \|\| irq != phy->spi_dev->irq) {
	193	WARN_ON_ONCE(1);
	194	return IRQ_NONE;
	195	}
	196
	197	dev = phy->spi_dev;
	198	dev_dbg(&dev->dev, "IRQ\n");
	199
	200	if (phy->ndlc->hard_fault)
	201	return IRQ_HANDLED;
	202
	203	if (!phy->ndlc->powered) {
	204	st_nci_spi_disable(phy);
	205	return IRQ_HANDLED;
	206	}
	207
	208	r = st_nci_spi_read(phy, &skb);
	209	if (r == -EREMOTEIO \|\| r == -ENOMEM \|\| r == -EBADMSG)
	210	return IRQ_HANDLED;
	211
	212	ndlc_recv(phy->ndlc, skb);
	213
	214	return IRQ_HANDLED;
	215	}
	216
	217	static struct nfc_phy_ops spi_phy_ops = {
	218	.write = st_nci_spi_write,
	219	.enable = st_nci_spi_enable,
	220	.disable = st_nci_spi_disable,
	221	};
	222
60cd6d89 CR	223	static int st_nci_spi_acpi_request_resources(struct spi_device *spi_dev)
	224	{
	225	struct st_nci_spi_phy *phy = spi_get_drvdata(spi_dev);
1f34b204	226	struct device *dev = &spi_dev->dev;
60cd6d89	227
60cd6d89	228	/* Get RESET GPIO from ACPI */
a89e68f1 AS	229	phy->gpiod_reset = devm_gpiod_get_index(dev, ST_NCI_GPIO_NAME_RESET,
	230	1, GPIOD_OUT_HIGH);
	231	if (IS_ERR(phy->gpiod_reset)) {
60cd6d89	232	nfc_err(dev, "Unable to get RESET GPIO\n");
a89e68f1	233	return PTR_ERR(phy->gpiod_reset);
60cd6d89 CR	234	}
60cd6d89 CR	235
60cd6d89 CR	236	return 0;
	237	}
	238
a89e68f1	239	static int st_nci_spi_of_request_resources(struct spi_device *spi)
2bc4d4f8	240	{
a89e68f1 AS	241	struct st_nci_spi_phy *phy = spi_get_drvdata(spi);
a89e68f1 AS	242	struct device *dev = &spi->dev;
2bc4d4f8 CR	243
2bc4d4f8 CR	244	/* Get GPIO from device tree */
a89e68f1 AS	245	phy->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	246	if (IS_ERR(phy->gpiod_reset)) {
	247	nfc_err(dev, "Unable to get RESET GPIO\n");
	248	return PTR_ERR(phy->gpiod_reset);
2bc4d4f8	249	}
2bc4d4f8	250
2bc4d4f8 CR	251	return 0;
2bc4d4f8 CR	252	}
2bc4d4f8	253
2bc4d4f8 CR	254	static int st_nci_spi_probe(struct spi_device *dev)
	255	{
	256	struct st_nci_spi_phy *phy;
2bc4d4f8 CR	257	int r;
	258
	259	dev_dbg(&dev->dev, "%s\n", __func__);
	260	dev_dbg(&dev->dev, "IRQ: %d\n", dev->irq);
	261
	262	/* Check SPI platform functionnalities */
	263	if (!dev) {
	264	pr_debug("%s: dev is NULL. Device is not accessible.\n",
	265	__func__);
	266	return -ENODEV;
	267	}
	268
	269	phy = devm_kzalloc(&dev->dev, sizeof(struct st_nci_spi_phy),
	270	GFP_KERNEL);
	271	if (!phy)
	272	return -ENOMEM;
	273
	274	phy->spi_dev = dev;
	275
	276	spi_set_drvdata(dev, phy);
	277
61a04101	278	if (dev->dev.of_node) {
2bc4d4f8 CR	279	r = st_nci_spi_of_request_resources(dev);
	280	if (r) {
	281	nfc_err(&dev->dev, "No platform data\n");
	282	return r;
	283	}
60cd6d89 CR	284	} else if (ACPI_HANDLE(&dev->dev)) {
	285	r = st_nci_spi_acpi_request_resources(dev);
	286	if (r) {
	287	nfc_err(&dev->dev, "Cannot get ACPI data\n");
	288	return r;
	289	}
2bc4d4f8 CR	290	} else {
	291	nfc_err(&dev->dev,
	292	"st_nci platform resources not available\n");
	293	return -ENODEV;
	294	}
	295
75719b2b AS	296	phy->se_status.is_ese_present =
	297	device_property_read_bool(&dev->dev, "ese-present");
	298	phy->se_status.is_uicc_present =
	299	device_property_read_bool(&dev->dev, "uicc-present");
	300
2bc4d4f8 CR	301	r = ndlc_probe(phy, &spi_phy_ops, &dev->dev,
2bc4d4f8 CR	302	ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
3648dc6d	303	&phy->ndlc, &phy->se_status);
2bc4d4f8 CR	304	if (r < 0) {
	305	nfc_err(&dev->dev, "Unable to register ndlc layer\n");
	306	return r;
	307	}
	308
bb2496c3	309	phy->irq_active = true;
2bc4d4f8 CR	310	r = devm_request_threaded_irq(&dev->dev, dev->irq, NULL,
2bc4d4f8 CR	311	st_nci_irq_thread_fn,
1af9fea6	312	IRQF_ONESHOT,
2bc4d4f8 CR	313	ST_NCI_SPI_DRIVER_NAME, phy);
	314	if (r < 0)
	315	nfc_err(&dev->dev, "Unable to register IRQ handler\n");
	316
	317	return r;
	318	}
	319
	320	static int st_nci_spi_remove(struct spi_device *dev)
	321	{
	322	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	323
	324	dev_dbg(&dev->dev, "%s\n", __func__);
	325
	326	ndlc_remove(phy->ndlc);
	327
	328	return 0;
	329	}
	330
3252897f CR	331	static struct spi_device_id st_nci_spi_id_table[] = {
	332	{ST_NCI_SPI_DRIVER_NAME, 0},
	333	{}
	334	};
	335	MODULE_DEVICE_TABLE(spi, st_nci_spi_id_table);
	336
60cd6d89 CR	337	static const struct acpi_device_id st_nci_spi_acpi_match[] = {
	338	{"SMO2101", 0},
	339	{}
	340	};
	341	MODULE_DEVICE_TABLE(acpi, st_nci_spi_acpi_match);
	342
2bc4d4f8 CR	343	static const struct of_device_id of_st_nci_spi_match[] = {
	344	{ .compatible = "st,st21nfcb-spi", },
	345	{}
	346	};
	347	MODULE_DEVICE_TABLE(of, of_st_nci_spi_match);
2bc4d4f8 CR	348
	349	static struct spi_driver st_nci_spi_driver = {
	350	.driver = {
2bc4d4f8 CR	351	.name = ST_NCI_SPI_DRIVER_NAME,
2bc4d4f8 CR	352	.of_match_table = of_match_ptr(of_st_nci_spi_match),
60cd6d89	353	.acpi_match_table = ACPI_PTR(st_nci_spi_acpi_match),
2bc4d4f8 CR	354	},
	355	.probe = st_nci_spi_probe,
	356	.id_table = st_nci_spi_id_table,
	357	.remove = st_nci_spi_remove,
	358	};
2bc4d4f8 CR	359	module_spi_driver(st_nci_spi_driver);
	360
	361	MODULE_LICENSE("GPL");
	362	MODULE_DESCRIPTION(DRIVER_DESC);