[linux-2.6-block.git] / drivers / nfc / st-nci / i2c.c

/*
 * I2C Link Layer for ST NCI NFC controller familly 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/i2c.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 <linux/platform_data/st-nci.h>

#include "ndlc.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_I2C_MIN_SIZE 4   /* PCB(1) + NCI Packet header(3) */
#define ST_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */

#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c"

static struct i2c_device_id st_nci_i2c_id_table[] = {
	{ST_NCI_DRIVER_NAME, 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table);

struct st_nci_i2c_phy {
	struct i2c_client *i2c_dev;
	struct llt_ndlc *ndlc;

	unsigned int gpio_reset;
	unsigned int irq_polarity;
};

#define I2C_DUMP_SKB(info, skb)					\
do {								\
	pr_debug("%s:\n", info);				\
	print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET,	\
		       16, 1, (skb)->data, (skb)->len, 0);	\
} while (0)

static int st_nci_i2c_enable(void *phy_id)
{
	struct st_nci_i2c_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)
		enable_irq(phy->i2c_dev->irq);

	return 0;
}

static void st_nci_i2c_disable(void *phy_id)
{
	struct st_nci_i2c_phy *phy = phy_id;

	disable_irq_nosync(phy->i2c_dev->irq);
}

/*
 * 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_i2c_write(void *phy_id, struct sk_buff *skb)
{
	int r = -1;
	struct st_nci_i2c_phy *phy = phy_id;
	struct i2c_client *client = phy->i2c_dev;

	I2C_DUMP_SKB("st_nci_i2c_write", skb);

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

	r = i2c_master_send(client, skb->data, skb->len);
	if (r < 0) {  /* Retry, chip was in standby */
		usleep_range(1000, 4000);
		r = i2c_master_send(client, skb->data, skb->len);
	}

	if (r >= 0) {
		if (r != skb->len)
			r = -EREMOTEIO;
		else
			r = 0;
	}

	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_i2c_read(struct st_nci_i2c_phy *phy,
				 struct sk_buff **skb)
{
	int r;
	u8 len;
	u8 buf[ST_NCI_I2C_MAX_SIZE];
	struct i2c_client *client = phy->i2c_dev;

	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
	if (r < 0) {  /* Retry, chip was in standby */
		usleep_range(1000, 4000);
		r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
	}

	if (r != ST_NCI_I2C_MIN_SIZE)
		return -EREMOTEIO;

	len = be16_to_cpu(*(__be16 *) (buf + 2));
	if (len > ST_NCI_I2C_MAX_SIZE) {
		nfc_err(&client->dev, "invalid frame len\n");
		return -EBADMSG;
	}

	*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
	if (*skb == NULL)
		return -ENOMEM;

	skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
	skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
	memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);

	if (!len)
		return 0;

	r = i2c_master_recv(client, buf, len);
	if (r != len) {
		kfree_skb(*skb);
		return -EREMOTEIO;
	}

	skb_put(*skb, len);
	memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);

	I2C_DUMP_SKB("i2c frame read", *skb);

	return 0;
}

/*
 * Reads an ndlc frame from the chip.
 *
 * On ST_NCI, IRQ goes in idle state when read starts.
 */
static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
{
	struct st_nci_i2c_phy *phy = phy_id;
	struct i2c_client *client;
	struct sk_buff *skb = NULL;
	int r;

	if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) {
		WARN_ON_ONCE(1);
		return IRQ_NONE;
	}

	client = phy->i2c_dev;
	dev_dbg(&client->dev, "IRQ\n");

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

	if (!phy->ndlc->powered) {
		st_nci_i2c_disable(phy);
		return IRQ_HANDLED;
	}

	r = st_nci_i2c_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 i2c_phy_ops = {
	.write = st_nci_i2c_write,
	.enable = st_nci_i2c_enable,
	.disable = st_nci_i2c_disable,
};

#ifdef CONFIG_OF
static int st_nci_i2c_of_request_resources(struct i2c_client *client)
{
	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
	struct device_node *pp;
	int gpio;
	int r;

	pp = client->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(&client->dev,
			"Failed to retrieve reset-gpios from device tree\n");
		return gpio;
	}

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

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

	return 0;
}
#else
static int st_nci_i2c_of_request_resources(struct i2c_client *client)
{
	return -ENODEV;
}
#endif

static int st_nci_i2c_request_resources(struct i2c_client *client)
{
	struct st_nci_nfc_platform_data *pdata;
	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
	int r;

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

	return 0;
}

static int st_nci_i2c_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct st_nci_i2c_phy *phy;
	struct st_nci_nfc_platform_data *pdata;
	int r;

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

	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 st_nci_i2c_phy),
			   GFP_KERNEL);
	if (!phy)
		return -ENOMEM;

	phy->i2c_dev = client;

	i2c_set_clientdata(client, phy);

	pdata = client->dev.platform_data;
	if (!pdata && client->dev.of_node) {
		r = st_nci_i2c_of_request_resources(client);
		if (r) {
			nfc_err(&client->dev, "No platform data\n");
			return r;
		}
	} else if (pdata) {
		r = st_nci_i2c_request_resources(client);
		if (r) {
			nfc_err(&client->dev,
				"Cannot get platform resources\n");
			return r;
		}
	} else {
		nfc_err(&client->dev,
			"st_nci platform resources not available\n");
		return -ENODEV;
	}

	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
			ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
			&phy->ndlc);
	if (r < 0) {
		nfc_err(&client->dev, "Unable to register ndlc layer\n");
		return r;
	}

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

	return r;
}

static int st_nci_i2c_remove(struct i2c_client *client)
{
	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);

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

	ndlc_remove(phy->ndlc);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id of_st_nci_i2c_match[] = {
	{ .compatible = "st,st21nfcb-i2c", },
	{ .compatible = "st,st21nfcb_i2c", },
	{ .compatible = "st,st21nfcc-i2c", },
	{}
};
MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
#endif

static struct i2c_driver st_nci_i2c_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = ST_NCI_I2C_DRIVER_NAME,
		.of_match_table = of_match_ptr(of_st_nci_i2c_match),
	},
	.probe = st_nci_i2c_probe,
	.id_table = st_nci_i2c_id_table,
	.remove = st_nci_i2c_remove,
};

module_i2c_driver(st_nci_i2c_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);
Commit	Line	Data
35630df6	1	/*
ed06aeef CR	2	* I2C Link Layer for ST NCI NFC controller familly based Driver
ed06aeef CR	3	* Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
35630df6 CR	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
35630df6 CR	20	#include <linux/module.h>
	21	#include <linux/i2c.h>
	22	#include <linux/gpio.h>
	23	#include <linux/of_irq.h>
	24	#include <linux/of_gpio.h>
35630df6 CR	25	#include <linux/interrupt.h>
	26	#include <linux/delay.h>
	27	#include <linux/nfc.h>
76b733d1	28	#include <linux/platform_data/st-nci.h>
35630df6	29
35630df6 CR	30	#include "ndlc.h"
35630df6 CR	31
30458aac	32	#define DRIVER_DESC "NCI NFC driver for ST_NCI"
35630df6 CR	33
35630df6 CR	34	/* ndlc header */
30458aac CR	35	#define ST_NCI_FRAME_HEADROOM 1
30458aac CR	36	#define ST_NCI_FRAME_TAILROOM 0
35630df6	37
ed06aeef CR	38	#define ST_NCI_I2C_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
ed06aeef CR	39	#define ST_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */
35630df6	40
ed06aeef	41	#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c"
35630df6	42
ed06aeef CR	43	static struct i2c_device_id st_nci_i2c_id_table[] = {
ed06aeef CR	44	{ST_NCI_DRIVER_NAME, 0},
35630df6 CR	45	{}
35630df6 CR	46	};
ed06aeef	47	MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table);
35630df6	48
ed06aeef	49	struct st_nci_i2c_phy {
35630df6 CR	50	struct i2c_client *i2c_dev;
	51	struct llt_ndlc *ndlc;
	52
35630df6 CR	53	unsigned int gpio_reset;
35630df6 CR	54	unsigned int irq_polarity;
35630df6 CR	55	};
	56
	57	#define I2C_DUMP_SKB(info, skb) \
	58	do { \
	59	pr_debug("%s:\n", info); \
	60	print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \
	61	16, 1, (skb)->data, (skb)->len, 0); \
	62	} while (0)
	63
ed06aeef	64	static int st_nci_i2c_enable(void *phy_id)
35630df6	65	{
ed06aeef	66	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	67
	68	gpio_set_value(phy->gpio_reset, 0);
	69	usleep_range(10000, 15000);
	70	gpio_set_value(phy->gpio_reset, 1);
35630df6 CR	71	usleep_range(80000, 85000);
35630df6 CR	72
05f0939f CR	73	if (phy->ndlc->powered == 0)
	74	enable_irq(phy->i2c_dev->irq);
	75
35630df6 CR	76	return 0;
	77	}
	78
ed06aeef	79	static void st_nci_i2c_disable(void *phy_id)
35630df6	80	{
ed06aeef	81	struct st_nci_i2c_phy *phy = phy_id;
35630df6	82
05f0939f	83	disable_irq_nosync(phy->i2c_dev->irq);
35630df6 CR	84	}
35630df6 CR	85
35630df6 CR	86	/*
	87	* Writing a frame must not return the number of written bytes.
	88	* It must return either zero for success, or <0 for error.
	89	* In addition, it must not alter the skb
	90	*/
ed06aeef	91	static int st_nci_i2c_write(void phy_id, struct sk_buff skb)
35630df6 CR	92	{
35630df6 CR	93	int r = -1;
ed06aeef	94	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	95	struct i2c_client *client = phy->i2c_dev;
35630df6 CR	96
ed06aeef	97	I2C_DUMP_SKB("st_nci_i2c_write", skb);
35630df6	98
4294e320 CR	99	if (phy->ndlc->hard_fault != 0)
4294e320 CR	100	return phy->ndlc->hard_fault;
35630df6 CR	101
35630df6 CR	102	r = i2c_master_send(client, skb->data, skb->len);
d4a41d10	103	if (r < 0) { /* Retry, chip was in standby */
35630df6 CR	104	usleep_range(1000, 4000);
	105	r = i2c_master_send(client, skb->data, skb->len);
	106	}
	107
	108	if (r >= 0) {
	109	if (r != skb->len)
	110	r = -EREMOTEIO;
	111	else
	112	r = 0;
	113	}
	114
35630df6 CR	115	return r;
	116	}
	117
	118	/*
	119	* Reads an ndlc frame and returns it in a newly allocated sk_buff.
	120	* returns:
e7723b33	121	* 0 : if received frame is complete
35630df6 CR	122	* -EREMOTEIO : i2c read error (fatal)
35630df6 CR	123	* -EBADMSG : frame was incorrect and discarded
e7723b33	124	* -ENOMEM : cannot allocate skb, frame dropped
35630df6	125	*/
ed06aeef	126	static int st_nci_i2c_read(struct st_nci_i2c_phy *phy,
35630df6 CR	127	struct sk_buff **skb)
	128	{
	129	int r;
	130	u8 len;
ed06aeef	131	u8 buf[ST_NCI_I2C_MAX_SIZE];
35630df6 CR	132	struct i2c_client *client = phy->i2c_dev;
35630df6 CR	133
ed06aeef	134	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
d4a41d10	135	if (r < 0) { /* Retry, chip was in standby */
35630df6	136	usleep_range(1000, 4000);
ed06aeef	137	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
ac633ba6 CR	138	}
ac633ba6 CR	139
ed06aeef	140	if (r != ST_NCI_I2C_MIN_SIZE)
35630df6	141	return -EREMOTEIO;
35630df6 CR	142
35630df6 CR	143	len = be16_to_cpu((__be16 ) (buf + 2));
ed06aeef	144	if (len > ST_NCI_I2C_MAX_SIZE) {
35630df6 CR	145	nfc_err(&client->dev, "invalid frame len\n");
	146	return -EBADMSG;
	147	}
	148
ed06aeef	149	*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
35630df6 CR	150	if (*skb == NULL)
	151	return -ENOMEM;
	152
ed06aeef CR	153	skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
	154	skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
	155	memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);
35630df6 CR	156
	157	if (!len)
	158	return 0;
	159
	160	r = i2c_master_recv(client, buf, len);
	161	if (r != len) {
	162	kfree_skb(*skb);
	163	return -EREMOTEIO;
	164	}
	165
	166	skb_put(*skb, len);
ed06aeef	167	memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);
35630df6 CR	168
	169	I2C_DUMP_SKB("i2c frame read", *skb);
	170
	171	return 0;
	172	}
	173
	174	/*
	175	* Reads an ndlc frame from the chip.
	176	*
30458aac	177	* On ST_NCI, IRQ goes in idle state when read starts.
35630df6	178	*/
ed06aeef	179	static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
35630df6	180	{
ed06aeef	181	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	182	struct i2c_client *client;
	183	struct sk_buff *skb = NULL;
	184	int r;
	185
7274496f	186	if (!phy \|\| !phy->ndlc \|\| irq != phy->i2c_dev->irq) {
35630df6 CR	187	WARN_ON_ONCE(1);
	188	return IRQ_NONE;
	189	}
	190
	191	client = phy->i2c_dev;
	192	dev_dbg(&client->dev, "IRQ\n");
	193
4294e320	194	if (phy->ndlc->hard_fault)
35630df6 CR	195	return IRQ_HANDLED;
35630df6 CR	196
183fe2d0	197	if (!phy->ndlc->powered) {
ed06aeef	198	st_nci_i2c_disable(phy);
35630df6 CR	199	return IRQ_HANDLED;
	200	}
	201
ed06aeef	202	r = st_nci_i2c_read(phy, &skb);
4294e320	203	if (r == -EREMOTEIO \|\| r == -ENOMEM \|\| r == -EBADMSG)
35630df6	204	return IRQ_HANDLED;
35630df6 CR	205
	206	ndlc_recv(phy->ndlc, skb);
	207
	208	return IRQ_HANDLED;
	209	}
	210
	211	static struct nfc_phy_ops i2c_phy_ops = {
ed06aeef CR	212	.write = st_nci_i2c_write,
	213	.enable = st_nci_i2c_enable,
	214	.disable = st_nci_i2c_disable,
35630df6 CR	215	};
	216
	217	#ifdef CONFIG_OF
ed06aeef	218	static int st_nci_i2c_of_request_resources(struct i2c_client *client)
35630df6	219	{
ed06aeef	220	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6 CR	221	struct device_node *pp;
	222	int gpio;
	223	int r;
	224
	225	pp = client->dev.of_node;
	226	if (!pp)
	227	return -ENODEV;
	228
	229	/* Get GPIO from device tree */
	230	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
	231	if (gpio < 0) {
	232	nfc_err(&client->dev,
	233	"Failed to retrieve reset-gpios from device tree\n");
	234	return gpio;
	235	}
	236
	237	/* GPIO request and configuration */
56ee645e CR	238	r = devm_gpio_request_one(&client->dev, gpio,
56ee645e CR	239	GPIOF_OUT_INIT_HIGH, "clf_reset");
35630df6 CR	240	if (r) {
35630df6 CR	241	nfc_err(&client->dev, "Failed to request reset pin\n");
18159624	242	return r;
35630df6	243	}
35630df6 CR	244	phy->gpio_reset = gpio;
35630df6 CR	245
a80d0cb6	246	phy->irq_polarity = irq_get_trigger_type(client->irq);
35630df6 CR	247
	248	return 0;
	249	}
	250	#else
ed06aeef	251	static int st_nci_i2c_of_request_resources(struct i2c_client *client)
35630df6 CR	252	{
	253	return -ENODEV;
	254	}
	255	#endif
	256
ed06aeef	257	static int st_nci_i2c_request_resources(struct i2c_client *client)
35630df6	258	{
ed06aeef CR	259	struct st_nci_nfc_platform_data *pdata;
ed06aeef CR	260	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6	261	int r;
35630df6 CR	262
	263	pdata = client->dev.platform_data;
	264	if (pdata == NULL) {
	265	nfc_err(&client->dev, "No platform data\n");
	266	return -EINVAL;
	267	}
	268
	269	/* store for later use */
35630df6 CR	270	phy->gpio_reset = pdata->gpio_reset;
	271	phy->irq_polarity = pdata->irq_polarity;
	272
56ee645e CR	273	r = devm_gpio_request_one(&client->dev,
56ee645e CR	274	phy->gpio_reset, GPIOF_OUT_INIT_HIGH, "clf_reset");
35630df6 CR	275	if (r) {
35630df6 CR	276	pr_err("%s : reset gpio_request failed\n", __FILE__);
18159624	277	return r;
35630df6 CR	278	}
35630df6 CR	279
35630df6 CR	280	return 0;
	281	}
	282
ed06aeef	283	static int st_nci_i2c_probe(struct i2c_client *client,
35630df6 CR	284	const struct i2c_device_id *id)
35630df6 CR	285	{
ed06aeef CR	286	struct st_nci_i2c_phy *phy;
ed06aeef CR	287	struct st_nci_nfc_platform_data *pdata;
35630df6 CR	288	int r;
	289
	290	dev_dbg(&client->dev, "%s\n", __func__);
	291	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
	292
	293	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	294	nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
	295	return -ENODEV;
	296	}
	297
ed06aeef	298	phy = devm_kzalloc(&client->dev, sizeof(struct st_nci_i2c_phy),
35630df6	299	GFP_KERNEL);
3590ebc0	300	if (!phy)
35630df6	301	return -ENOMEM;
35630df6 CR	302
	303	phy->i2c_dev = client;
	304
	305	i2c_set_clientdata(client, phy);
	306
	307	pdata = client->dev.platform_data;
	308	if (!pdata && client->dev.of_node) {
ed06aeef	309	r = st_nci_i2c_of_request_resources(client);
35630df6 CR	310	if (r) {
	311	nfc_err(&client->dev, "No platform data\n");
	312	return r;
	313	}
	314	} else if (pdata) {
ed06aeef	315	r = st_nci_i2c_request_resources(client);
35630df6 CR	316	if (r) {
	317	nfc_err(&client->dev,
	318	"Cannot get platform resources\n");
	319	return r;
	320	}
	321	} else {
	322	nfc_err(&client->dev,
30458aac	323	"st_nci platform resources not available\n");
35630df6 CR	324	return -ENODEV;
	325	}
	326
7274496f	327	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
30458aac	328	ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
7274496f CR	329	&phy->ndlc);
	330	if (r < 0) {
	331	nfc_err(&client->dev, "Unable to register ndlc layer\n");
	332	return r;
	333	}
	334
35630df6	335	r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
ed06aeef	336	st_nci_irq_thread_fn,
35630df6	337	phy->irq_polarity \| IRQF_ONESHOT,
ed06aeef	338	ST_NCI_DRIVER_NAME, phy);
7274496f	339	if (r < 0)
35630df6	340	nfc_err(&client->dev, "Unable to register IRQ handler\n");
35630df6	341
7274496f	342	return r;
35630df6 CR	343	}
35630df6 CR	344
ed06aeef	345	static int st_nci_i2c_remove(struct i2c_client *client)
35630df6	346	{
ed06aeef	347	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6 CR	348
	349	dev_dbg(&client->dev, "%s\n", __func__);
	350
	351	ndlc_remove(phy->ndlc);
	352
35630df6 CR	353	return 0;
	354	}
	355
d9b66918	356	#ifdef CONFIG_OF
ed06aeef	357	static const struct of_device_id of_st_nci_i2c_match[] = {
1a94cb60	358	{ .compatible = "st,st21nfcb-i2c", },
35630df6	359	{ .compatible = "st,st21nfcb_i2c", },
ed06aeef	360	{ .compatible = "st,st21nfcc-i2c", },
35630df6 CR	361	{}
35630df6 CR	362	};
ed06aeef	363	MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
d9b66918	364	#endif
35630df6	365
ed06aeef	366	static struct i2c_driver st_nci_i2c_driver = {
35630df6 CR	367	.driver = {
35630df6 CR	368	.owner = THIS_MODULE,
ed06aeef CR	369	.name = ST_NCI_I2C_DRIVER_NAME,
ed06aeef CR	370	.of_match_table = of_match_ptr(of_st_nci_i2c_match),
35630df6	371	},
ed06aeef CR	372	.probe = st_nci_i2c_probe,
	373	.id_table = st_nci_i2c_id_table,
	374	.remove = st_nci_i2c_remove,
35630df6 CR	375	};
35630df6 CR	376
ed06aeef	377	module_i2c_driver(st_nci_i2c_driver);
35630df6 CR	378
	379	MODULE_LICENSE("GPL");
	380	MODULE_DESCRIPTION(DRIVER_DESC);