[linux-2.6-block.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.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <linux/platform_data/st-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_SPI_DRIVER_NAME "st_nci_spi"

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);

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

	bool irq_active;

	unsigned int gpio_reset;
	unsigned int irq_polarity;

	struct st_nci_se_status se_status;
};

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

	gpio_set_value(phy->gpio_reset, 0);
	usleep_range(10000, 15000);
	gpio_set_value(phy->gpio_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_of_request_resources(struct spi_device *dev)
{
	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	struct device_node *pp;
	int gpio;
	int r;

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

	/* Get GPIO from device tree */
	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
	if (gpio < 0) {
		nfc_err(&dev->dev,
			"Failed to retrieve reset-gpios from device tree\n");
		return gpio;
	}

	/* GPIO request and configuration */
	r = devm_gpio_request_one(&dev->dev, gpio,
				GPIOF_OUT_INIT_HIGH, "clf_reset");
	if (r) {
		nfc_err(&dev->dev, "Failed to request reset pin\n");
		return r;
	}
	phy->gpio_reset = gpio;

	phy->irq_polarity = irq_get_trigger_type(dev->irq);

	phy->se_status.is_ese_present =
				of_property_read_bool(pp, "ese-present");
	phy->se_status.is_uicc_present =
				of_property_read_bool(pp, "uicc-present");

	return 0;
}

static int st_nci_spi_request_resources(struct spi_device *dev)
{
	struct st_nci_nfc_platform_data *pdata;
	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	int r;

	pdata = dev->dev.platform_data;
	if (pdata == NULL) {
		nfc_err(&dev->dev, "No platform data\n");
		return -EINVAL;
	}

	/* store for later use */
	phy->gpio_reset = pdata->gpio_reset;
	phy->irq_polarity = pdata->irq_polarity;

	r = devm_gpio_request_one(&dev->dev,
			phy->gpio_reset, GPIOF_OUT_INIT_HIGH, "clf_reset");
	if (r) {
		pr_err("%s : reset gpio_request failed\n", __FILE__);
		return r;
	}

	phy->se_status.is_ese_present = pdata->is_ese_present;
	phy->se_status.is_uicc_present = pdata->is_uicc_present;

	return 0;
}

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

	pdata = dev->dev.platform_data;
	if (!pdata && 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 (pdata) {
		r = st_nci_spi_request_resources(dev);
		if (r) {
			nfc_err(&dev->dev,
				"Cannot get platform resources\n");
			return r;
		}
	} else {
		nfc_err(&dev->dev,
			"st_nci platform resources not available\n");
		return -ENODEV;
	}

	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,
				phy->irq_polarity | 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 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),
	},
	.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>
	22	#include <linux/gpio.h>
	23	#include <linux/of_irq.h>
	24	#include <linux/of_gpio.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/delay.h>
	27	#include <linux/nfc.h>
a1269dd1	28	#include <net/nfc/nci.h>
2bc4d4f8 CR	29	#include <linux/platform_data/st-nci.h>
2bc4d4f8 CR	30
e67e7e59	31	#include "st-nci.h"
2bc4d4f8 CR	32
	33	#define DRIVER_DESC "NCI NFC driver for ST_NCI"
	34
	35	/* ndlc header */
	36	#define ST_NCI_FRAME_HEADROOM 1
	37	#define ST_NCI_FRAME_TAILROOM 0
	38
	39	#define ST_NCI_SPI_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
	40	#define ST_NCI_SPI_MAX_SIZE 250 /* req 4.2.1 */
	41
	42	#define ST_NCI_SPI_DRIVER_NAME "st_nci_spi"
	43
	44	static struct spi_device_id st_nci_spi_id_table[] = {
	45	{ST_NCI_SPI_DRIVER_NAME, 0},
	46	{}
	47	};
	48	MODULE_DEVICE_TABLE(spi, st_nci_spi_id_table);
	49
	50	struct st_nci_spi_phy {
	51	struct spi_device *spi_dev;
	52	struct llt_ndlc *ndlc;
	53
bb2496c3 CR	54	bool irq_active;
bb2496c3 CR	55
2bc4d4f8 CR	56	unsigned int gpio_reset;
2bc4d4f8 CR	57	unsigned int irq_polarity;
3648dc6d CR	58
3648dc6d CR	59	struct st_nci_se_status se_status;
2bc4d4f8 CR	60	};
2bc4d4f8 CR	61
2bc4d4f8 CR	62	static int st_nci_spi_enable(void *phy_id)
	63	{
	64	struct st_nci_spi_phy *phy = phy_id;
	65
	66	gpio_set_value(phy->gpio_reset, 0);
	67	usleep_range(10000, 15000);
	68	gpio_set_value(phy->gpio_reset, 1);
	69	usleep_range(80000, 85000);
	70
bb2496c3	71	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
2bc4d4f8	72	enable_irq(phy->spi_dev->irq);
bb2496c3 CR	73	phy->irq_active = true;
bb2496c3 CR	74	}
2bc4d4f8 CR	75
	76	return 0;
	77	}
	78
	79	static void st_nci_spi_disable(void *phy_id)
	80	{
	81	struct st_nci_spi_phy *phy = phy_id;
	82
	83	disable_irq_nosync(phy->spi_dev->irq);
bb2496c3	84	phy->irq_active = false;
2bc4d4f8 CR	85	}
	86
	87	/*
	88	* Writing a frame must not return the number of written bytes.
	89	* It must return either zero for success, or <0 for error.
	90	* In addition, it must not alter the skb
	91	*/
	92	static int st_nci_spi_write(void phy_id, struct sk_buff skb)
	93	{
	94	int r;
	95	struct st_nci_spi_phy *phy = phy_id;
	96	struct spi_device *dev = phy->spi_dev;
	97	struct sk_buff *skb_rx;
a1269dd1 CR	98	u8 buf[ST_NCI_SPI_MAX_SIZE + NCI_DATA_HDR_SIZE +
a1269dd1 CR	99	ST_NCI_FRAME_HEADROOM + ST_NCI_FRAME_TAILROOM];
2bc4d4f8 CR	100	struct spi_transfer spi_xfer = {
	101	.tx_buf = skb->data,
	102	.rx_buf = buf,
	103	.len = skb->len,
	104	};
	105
2bc4d4f8 CR	106	if (phy->ndlc->hard_fault != 0)
	107	return phy->ndlc->hard_fault;
	108
	109	r = spi_sync_transfer(dev, &spi_xfer, 1);
	110	/*
	111	* We may have received some valuable data on miso line.
	112	* Send them back in the ndlc state machine.
	113	*/
	114	if (!r) {
	115	skb_rx = alloc_skb(skb->len, GFP_KERNEL);
	116	if (!skb_rx) {
	117	r = -ENOMEM;
	118	goto exit;
	119	}
	120
	121	skb_put(skb_rx, skb->len);
	122	memcpy(skb_rx->data, buf, skb->len);
	123	ndlc_recv(phy->ndlc, skb_rx);
	124	}
	125
	126	exit:
	127	return r;
	128	}
	129
	130	/*
	131	* Reads an ndlc frame and returns it in a newly allocated sk_buff.
	132	* returns:
	133	* 0 : if received frame is complete
	134	* -EREMOTEIO : i2c read error (fatal)
	135	* -EBADMSG : frame was incorrect and discarded
	136	* -ENOMEM : cannot allocate skb, frame dropped
	137	*/
	138	static int st_nci_spi_read(struct st_nci_spi_phy *phy,
	139	struct sk_buff **skb)
	140	{
	141	int r;
	142	u8 len;
	143	u8 buf[ST_NCI_SPI_MAX_SIZE];
	144	struct spi_device *dev = phy->spi_dev;
	145	struct spi_transfer spi_xfer = {
	146	.rx_buf = buf,
	147	.len = ST_NCI_SPI_MIN_SIZE,
	148	};
	149
	150	r = spi_sync_transfer(dev, &spi_xfer, 1);
	151	if (r < 0)
	152	return -EREMOTEIO;
	153
	154	len = be16_to_cpu((__be16 ) (buf + 2));
	155	if (len > ST_NCI_SPI_MAX_SIZE) {
	156	nfc_err(&dev->dev, "invalid frame len\n");
	157	phy->ndlc->hard_fault = 1;
	158	return -EBADMSG;
	159	}
	160
	161	*skb = alloc_skb(ST_NCI_SPI_MIN_SIZE + len, GFP_KERNEL);
	162	if (*skb == NULL)
	163	return -ENOMEM;
	164
	165	skb_reserve(*skb, ST_NCI_SPI_MIN_SIZE);
	166	skb_put(*skb, ST_NCI_SPI_MIN_SIZE);
	167	memcpy((*skb)->data, buf, ST_NCI_SPI_MIN_SIZE);
	168
	169	if (!len)
170	return 0;
171
172	spi_xfer.len = len;
173	r = spi_sync_transfer(dev, &spi_xfer, 1);
174	if (r < 0) {
175	kfree_skb(*skb);
176	return -EREMOTEIO;
177	}
178
179	skb_put(*skb, len);
180	memcpy((*skb)->data + ST_NCI_SPI_MIN_SIZE, buf, len);
181
2bc4d4f8 CR	182	return 0;
	183	}
	184
	185	/*
	186	* Reads an ndlc frame from the chip.
	187	*
	188	* On ST21NFCB, IRQ goes in idle state when read starts.
	189	*/
	190	static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
	191	{
	192	struct st_nci_spi_phy *phy = phy_id;
	193	struct spi_device *dev;
	194	struct sk_buff *skb = NULL;
	195	int r;
	196
	197	if (!phy \|\| !phy->ndlc \|\| irq != phy->spi_dev->irq) {
	198	WARN_ON_ONCE(1);
	199	return IRQ_NONE;
	200	}
	201
	202	dev = phy->spi_dev;
	203	dev_dbg(&dev->dev, "IRQ\n");
	204
	205	if (phy->ndlc->hard_fault)
	206	return IRQ_HANDLED;
	207
	208	if (!phy->ndlc->powered) {
	209	st_nci_spi_disable(phy);
	210	return IRQ_HANDLED;
	211	}
	212
	213	r = st_nci_spi_read(phy, &skb);
	214	if (r == -EREMOTEIO \|\| r == -ENOMEM \|\| r == -EBADMSG)
	215	return IRQ_HANDLED;
	216
	217	ndlc_recv(phy->ndlc, skb);
	218
	219	return IRQ_HANDLED;
	220	}
	221
	222	static struct nfc_phy_ops spi_phy_ops = {
	223	.write = st_nci_spi_write,
	224	.enable = st_nci_spi_enable,
	225	.disable = st_nci_spi_disable,
	226	};
	227
2bc4d4f8 CR	228	static int st_nci_spi_of_request_resources(struct spi_device *dev)
	229	{
	230	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	231	struct device_node *pp;
	232	int gpio;
	233	int r;
	234
	235	pp = dev->dev.of_node;
	236	if (!pp)
	237	return -ENODEV;
	238
	239	/* Get GPIO from device tree */
	240	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
	241	if (gpio < 0) {
	242	nfc_err(&dev->dev,
	243	"Failed to retrieve reset-gpios from device tree\n");
	244	return gpio;
	245	}
	246
	247	/* GPIO request and configuration */
	248	r = devm_gpio_request_one(&dev->dev, gpio,
	249	GPIOF_OUT_INIT_HIGH, "clf_reset");
	250	if (r) {
	251	nfc_err(&dev->dev, "Failed to request reset pin\n");
	252	return r;
	253	}
	254	phy->gpio_reset = gpio;
	255
	256	phy->irq_polarity = irq_get_trigger_type(dev->irq);
	257
3648dc6d CR	258	phy->se_status.is_ese_present =
	259	of_property_read_bool(pp, "ese-present");
	260	phy->se_status.is_uicc_present =
	261	of_property_read_bool(pp, "uicc-present");
	262
2bc4d4f8 CR	263	return 0;
2bc4d4f8 CR	264	}
2bc4d4f8 CR	265
	266	static int st_nci_spi_request_resources(struct spi_device *dev)
	267	{
	268	struct st_nci_nfc_platform_data *pdata;
	269	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	270	int r;
	271
	272	pdata = dev->dev.platform_data;
	273	if (pdata == NULL) {
	274	nfc_err(&dev->dev, "No platform data\n");
	275	return -EINVAL;
	276	}
	277
	278	/* store for later use */
	279	phy->gpio_reset = pdata->gpio_reset;
	280	phy->irq_polarity = pdata->irq_polarity;
	281
	282	r = devm_gpio_request_one(&dev->dev,
	283	phy->gpio_reset, GPIOF_OUT_INIT_HIGH, "clf_reset");
	284	if (r) {
	285	pr_err("%s : reset gpio_request failed\n", __FILE__);
	286	return r;
	287	}
	288
3648dc6d CR	289	phy->se_status.is_ese_present = pdata->is_ese_present;
	290	phy->se_status.is_uicc_present = pdata->is_uicc_present;
	291
2bc4d4f8 CR	292	return 0;
	293	}
	294
	295	static int st_nci_spi_probe(struct spi_device *dev)
	296	{
	297	struct st_nci_spi_phy *phy;
	298	struct st_nci_nfc_platform_data *pdata;
	299	int r;
	300
	301	dev_dbg(&dev->dev, "%s\n", __func__);
	302	dev_dbg(&dev->dev, "IRQ: %d\n", dev->irq);
	303
	304	/* Check SPI platform functionnalities */
	305	if (!dev) {
	306	pr_debug("%s: dev is NULL. Device is not accessible.\n",
	307	__func__);
	308	return -ENODEV;
	309	}
	310
	311	phy = devm_kzalloc(&dev->dev, sizeof(struct st_nci_spi_phy),
	312	GFP_KERNEL);
	313	if (!phy)
	314	return -ENOMEM;
	315
	316	phy->spi_dev = dev;
	317
	318	spi_set_drvdata(dev, phy);
	319
	320	pdata = dev->dev.platform_data;
	321	if (!pdata && dev->dev.of_node) {
	322	r = st_nci_spi_of_request_resources(dev);
	323	if (r) {
	324	nfc_err(&dev->dev, "No platform data\n");
	325	return r;
	326	}
	327	} else if (pdata) {
	328	r = st_nci_spi_request_resources(dev);
	329	if (r) {
	330	nfc_err(&dev->dev,
	331	"Cannot get platform resources\n");
	332	return r;
	333	}
	334	} else {
	335	nfc_err(&dev->dev,
	336	"st_nci platform resources not available\n");
	337	return -ENODEV;
	338	}
	339
	340	r = ndlc_probe(phy, &spi_phy_ops, &dev->dev,
	341	ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
3648dc6d	342	&phy->ndlc, &phy->se_status);
2bc4d4f8 CR	343	if (r < 0) {
	344	nfc_err(&dev->dev, "Unable to register ndlc layer\n");
	345	return r;
	346	}
	347
bb2496c3	348	phy->irq_active = true;
2bc4d4f8 CR	349	r = devm_request_threaded_irq(&dev->dev, dev->irq, NULL,
	350	st_nci_irq_thread_fn,
	351	phy->irq_polarity \| IRQF_ONESHOT,
	352	ST_NCI_SPI_DRIVER_NAME, phy);
	353	if (r < 0)
	354	nfc_err(&dev->dev, "Unable to register IRQ handler\n");
	355
	356	return r;
	357	}
	358
	359	static int st_nci_spi_remove(struct spi_device *dev)
	360	{
	361	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	362
	363	dev_dbg(&dev->dev, "%s\n", __func__);
	364
	365	ndlc_remove(phy->ndlc);
	366
	367	return 0;
	368	}
	369
2bc4d4f8 CR	370	static const struct of_device_id of_st_nci_spi_match[] = {
	371	{ .compatible = "st,st21nfcb-spi", },
	372	{}
	373	};
	374	MODULE_DEVICE_TABLE(of, of_st_nci_spi_match);
2bc4d4f8 CR	375
	376	static struct spi_driver st_nci_spi_driver = {
	377	.driver = {
2bc4d4f8 CR	378	.name = ST_NCI_SPI_DRIVER_NAME,
	379	.of_match_table = of_match_ptr(of_st_nci_spi_match),
	380	},
	381	.probe = st_nci_spi_probe,
	382	.id_table = st_nci_spi_id_table,
	383	.remove = st_nci_spi_remove,
	384	};
	385
	386	module_spi_driver(st_nci_spi_driver);
	387
	388	MODULE_LICENSE("GPL");
	389	MODULE_DESCRIPTION(DRIVER_DESC);