[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 ST21NFCB"

/* ndlc header */
#define ST21NFCB_FRAME_HEADROOM	1
#define ST21NFCB_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:
 * frame size : if received frame is complete (find ST21NFCB_SOF_EOF at
 * end of read)
 * -EAGAIN : if received frame is incomplete (not find ST21NFCB_SOF_EOF
 * at end of read)
 * -EREMOTEIO : i2c read error (fatal)
 * -EBADMSG : frame was incorrect and discarded
 * (value returned from st_nci_i2c_repack)
 * -EIO : if no ST21NFCB_SOF_EOF is found after reaching
 * the read length end sequence
 */
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 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_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,
			"st21nfcb platform resources not available\n");
		return -ENODEV;
	}

	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
			ST21NFCB_FRAME_HEADROOM, ST21NFCB_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>
ed06aeef	28	#include <linux/platform_data/st_nci.h>
35630df6	29
35630df6 CR	30	#include "ndlc.h"
	31
	32	#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
	33
	34	/* ndlc header */
	35	#define ST21NFCB_FRAME_HEADROOM 1
	36	#define ST21NFCB_FRAME_TAILROOM 0
	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:
	121	* frame size : if received frame is complete (find ST21NFCB_SOF_EOF at
	122	* end of read)
	123	* -EAGAIN : if received frame is incomplete (not find ST21NFCB_SOF_EOF
	124	* at end of read)
	125	* -EREMOTEIO : i2c read error (fatal)
	126	* -EBADMSG : frame was incorrect and discarded
ed06aeef	127	* (value returned from st_nci_i2c_repack)
35630df6 CR	128	* -EIO : if no ST21NFCB_SOF_EOF is found after reaching
	129	* the read length end sequence
	130	*/
ed06aeef	131	static int st_nci_i2c_read(struct st_nci_i2c_phy *phy,
35630df6 CR	132	struct sk_buff **skb)
	133	{
	134	int r;
	135	u8 len;
ed06aeef	136	u8 buf[ST_NCI_I2C_MAX_SIZE];
35630df6 CR	137	struct i2c_client *client = phy->i2c_dev;
35630df6 CR	138
ed06aeef	139	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
d4a41d10	140	if (r < 0) { /* Retry, chip was in standby */
35630df6	141	usleep_range(1000, 4000);
ed06aeef	142	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
ac633ba6 CR	143	}
ac633ba6 CR	144
ed06aeef	145	if (r != ST_NCI_I2C_MIN_SIZE)
35630df6	146	return -EREMOTEIO;
35630df6 CR	147
35630df6 CR	148	len = be16_to_cpu((__be16 ) (buf + 2));
ed06aeef	149	if (len > ST_NCI_I2C_MAX_SIZE) {
35630df6 CR	150	nfc_err(&client->dev, "invalid frame len\n");
	151	return -EBADMSG;
	152	}
	153
ed06aeef	154	*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
35630df6 CR	155	if (*skb == NULL)
	156	return -ENOMEM;
	157
ed06aeef CR	158	skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
	159	skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
	160	memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);
35630df6 CR	161
	162	if (!len)
	163	return 0;
	164
	165	r = i2c_master_recv(client, buf, len);
	166	if (r != len) {
	167	kfree_skb(*skb);
	168	return -EREMOTEIO;
	169	}
	170
	171	skb_put(*skb, len);
ed06aeef	172	memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);
35630df6 CR	173
	174	I2C_DUMP_SKB("i2c frame read", *skb);
	175
	176	return 0;
	177	}
	178
	179	/*
	180	* Reads an ndlc frame from the chip.
	181	*
	182	* On ST21NFCB, IRQ goes in idle state when read starts.
	183	*/
ed06aeef	184	static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
35630df6	185	{
ed06aeef	186	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	187	struct i2c_client *client;
	188	struct sk_buff *skb = NULL;
	189	int r;
	190
7274496f	191	if (!phy \|\| !phy->ndlc \|\| irq != phy->i2c_dev->irq) {
35630df6 CR	192	WARN_ON_ONCE(1);
	193	return IRQ_NONE;
	194	}
	195
	196	client = phy->i2c_dev;
	197	dev_dbg(&client->dev, "IRQ\n");
	198
4294e320	199	if (phy->ndlc->hard_fault)
35630df6 CR	200	return IRQ_HANDLED;
35630df6 CR	201
183fe2d0	202	if (!phy->ndlc->powered) {
ed06aeef	203	st_nci_i2c_disable(phy);
35630df6 CR	204	return IRQ_HANDLED;
	205	}
	206
ed06aeef	207	r = st_nci_i2c_read(phy, &skb);
4294e320	208	if (r == -EREMOTEIO \|\| r == -ENOMEM \|\| r == -EBADMSG)
35630df6	209	return IRQ_HANDLED;
35630df6 CR	210
	211	ndlc_recv(phy->ndlc, skb);
	212
	213	return IRQ_HANDLED;
	214	}
	215
	216	static struct nfc_phy_ops i2c_phy_ops = {
ed06aeef CR	217	.write = st_nci_i2c_write,
	218	.enable = st_nci_i2c_enable,
	219	.disable = st_nci_i2c_disable,
35630df6 CR	220	};
	221
	222	#ifdef CONFIG_OF
ed06aeef	223	static int st_nci_i2c_of_request_resources(struct i2c_client *client)
35630df6	224	{
ed06aeef	225	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6 CR	226	struct device_node *pp;
	227	int gpio;
	228	int r;
	229
	230	pp = client->dev.of_node;
	231	if (!pp)
	232	return -ENODEV;
	233
	234	/* Get GPIO from device tree */
	235	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
	236	if (gpio < 0) {
	237	nfc_err(&client->dev,
	238	"Failed to retrieve reset-gpios from device tree\n");
	239	return gpio;
	240	}
	241
	242	/* GPIO request and configuration */
56ee645e CR	243	r = devm_gpio_request_one(&client->dev, gpio,
56ee645e CR	244	GPIOF_OUT_INIT_HIGH, "clf_reset");
35630df6 CR	245	if (r) {
35630df6 CR	246	nfc_err(&client->dev, "Failed to request reset pin\n");
18159624	247	return r;
35630df6	248	}
35630df6 CR	249	phy->gpio_reset = gpio;
35630df6 CR	250
a80d0cb6	251	phy->irq_polarity = irq_get_trigger_type(client->irq);
35630df6 CR	252
	253	return 0;
	254	}
	255	#else
ed06aeef	256	static int st_nci_i2c_of_request_resources(struct i2c_client *client)
35630df6 CR	257	{
	258	return -ENODEV;
	259	}
	260	#endif
	261
ed06aeef	262	static int st_nci_i2c_request_resources(struct i2c_client *client)
35630df6	263	{
ed06aeef CR	264	struct st_nci_nfc_platform_data *pdata;
ed06aeef CR	265	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6	266	int r;
35630df6 CR	267
	268	pdata = client->dev.platform_data;
	269	if (pdata == NULL) {
	270	nfc_err(&client->dev, "No platform data\n");
	271	return -EINVAL;
	272	}
	273
	274	/* store for later use */
35630df6 CR	275	phy->gpio_reset = pdata->gpio_reset;
	276	phy->irq_polarity = pdata->irq_polarity;
	277
56ee645e CR	278	r = devm_gpio_request_one(&client->dev,
56ee645e CR	279	phy->gpio_reset, GPIOF_OUT_INIT_HIGH, "clf_reset");
35630df6 CR	280	if (r) {
35630df6 CR	281	pr_err("%s : reset gpio_request failed\n", __FILE__);
18159624	282	return r;
35630df6 CR	283	}
35630df6 CR	284
35630df6 CR	285	return 0;
	286	}
	287
ed06aeef	288	static int st_nci_i2c_probe(struct i2c_client *client,
35630df6 CR	289	const struct i2c_device_id *id)
35630df6 CR	290	{
ed06aeef CR	291	struct st_nci_i2c_phy *phy;
ed06aeef CR	292	struct st_nci_nfc_platform_data *pdata;
35630df6 CR	293	int r;
	294
	295	dev_dbg(&client->dev, "%s\n", __func__);
	296	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
	297
	298	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	299	nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
	300	return -ENODEV;
	301	}
	302
ed06aeef	303	phy = devm_kzalloc(&client->dev, sizeof(struct st_nci_i2c_phy),
35630df6	304	GFP_KERNEL);
3590ebc0	305	if (!phy)
35630df6	306	return -ENOMEM;
35630df6 CR	307
	308	phy->i2c_dev = client;
	309
	310	i2c_set_clientdata(client, phy);
	311
	312	pdata = client->dev.platform_data;
	313	if (!pdata && client->dev.of_node) {
ed06aeef	314	r = st_nci_i2c_of_request_resources(client);
35630df6 CR	315	if (r) {
	316	nfc_err(&client->dev, "No platform data\n");
	317	return r;
	318	}
	319	} else if (pdata) {
ed06aeef	320	r = st_nci_i2c_request_resources(client);
35630df6 CR	321	if (r) {
	322	nfc_err(&client->dev,
	323	"Cannot get platform resources\n");
	324	return r;
	325	}
	326	} else {
	327	nfc_err(&client->dev,
	328	"st21nfcb platform resources not available\n");
	329	return -ENODEV;
	330	}
	331
7274496f CR	332	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
	333	ST21NFCB_FRAME_HEADROOM, ST21NFCB_FRAME_TAILROOM,
	334	&phy->ndlc);
	335	if (r < 0) {
	336	nfc_err(&client->dev, "Unable to register ndlc layer\n");
	337	return r;
	338	}
	339
35630df6	340	r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
ed06aeef	341	st_nci_irq_thread_fn,
35630df6	342	phy->irq_polarity \| IRQF_ONESHOT,
ed06aeef	343	ST_NCI_DRIVER_NAME, phy);
7274496f	344	if (r < 0)
35630df6	345	nfc_err(&client->dev, "Unable to register IRQ handler\n");
35630df6	346
7274496f	347	return r;
35630df6 CR	348	}
35630df6 CR	349
ed06aeef	350	static int st_nci_i2c_remove(struct i2c_client *client)
35630df6	351	{
ed06aeef	352	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6 CR	353
	354	dev_dbg(&client->dev, "%s\n", __func__);
	355
	356	ndlc_remove(phy->ndlc);
	357
35630df6 CR	358	return 0;
	359	}
	360
d9b66918	361	#ifdef CONFIG_OF
ed06aeef	362	static const struct of_device_id of_st_nci_i2c_match[] = {
1a94cb60	363	{ .compatible = "st,st21nfcb-i2c", },
35630df6	364	{ .compatible = "st,st21nfcb_i2c", },
ed06aeef	365	{ .compatible = "st,st21nfcc-i2c", },
35630df6 CR	366	{}
35630df6 CR	367	};
ed06aeef	368	MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
d9b66918	369	#endif
35630df6	370
ed06aeef	371	static struct i2c_driver st_nci_i2c_driver = {
35630df6 CR	372	.driver = {
35630df6 CR	373	.owner = THIS_MODULE,
ed06aeef CR	374	.name = ST_NCI_I2C_DRIVER_NAME,
ed06aeef CR	375	.of_match_table = of_match_ptr(of_st_nci_i2c_match),
35630df6	376	},
ed06aeef CR	377	.probe = st_nci_i2c_probe,
	378	.id_table = st_nci_i2c_id_table,
	379	.remove = st_nci_i2c_remove,
35630df6 CR	380	};
35630df6 CR	381
ed06aeef	382	module_i2c_driver(st_nci_i2c_driver);
35630df6 CR	383
	384	MODULE_LICENSE("GPL");
	385	MODULE_DESCRIPTION(DRIVER_DESC);