[deliverable/linux.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/gpio/consumer.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/nfc.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_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"

#define ST_NCI_GPIO_NAME_RESET "reset"

struct st_nci_i2c_phy {
	struct i2c_client *i2c_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_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 && phy->irq_active == 0) {
		enable_irq(phy->i2c_dev->irq);
		phy->irq_active = true;
	}

	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);
	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_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;

	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);

	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,
};

static int st_nci_i2c_acpi_request_resources(struct i2c_client *client)
{
	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
	struct gpio_desc *gpiod_reset;
	struct device *dev = &client->dev;
	u8 tmp;

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

	phy->gpio_reset = desc_to_gpio(gpiod_reset);

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

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

	if (device_property_present(dev, "ese-present")) {
		device_property_read_u8(dev, "ese-present", &tmp);
		phy->se_status.is_ese_present = tmp;
	}

	if (device_property_present(dev, "uicc-present")) {
		device_property_read_u8(dev, "uicc-present", &tmp);
		phy->se_status.is_uicc_present = tmp;
	}

	return 0;
}

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, ST_NCI_GPIO_NAME_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);

	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_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,
			ST_NCI_GPIO_NAME_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_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 if (ACPI_HANDLE(&client->dev)) {
		r = st_nci_i2c_acpi_request_resources(client);
		if (r) {
			nfc_err(&client->dev, "Cannot get ACPI data\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, &phy->se_status);
	if (r < 0) {
		nfc_err(&client->dev, "Unable to register ndlc layer\n");
		return r;
	}

	phy->irq_active = true;
	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;
}

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

static const struct acpi_device_id st_nci_i2c_acpi_match[] = {
	{"SMO2101"},
	{"SMO2102"},
	{}
};
MODULE_DEVICE_TABLE(acpi, st_nci_i2c_acpi_match);

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);

static struct i2c_driver st_nci_i2c_driver = {
	.driver = {
		.name = ST_NCI_I2C_DRIVER_NAME,
		.of_match_table = of_match_ptr(of_st_nci_i2c_match),
		.acpi_match_table = ACPI_PTR(st_nci_i2c_acpi_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>
ed6a2f3f	23	#include <linux/gpio/consumer.h>
35630df6 CR	24	#include <linux/of_irq.h>
35630df6 CR	25	#include <linux/of_gpio.h>
ed6a2f3f	26	#include <linux/acpi.h>
35630df6 CR	27	#include <linux/interrupt.h>
	28	#include <linux/delay.h>
	29	#include <linux/nfc.h>
76b733d1	30	#include <linux/platform_data/st-nci.h>
35630df6	31
e67e7e59	32	#include "st-nci.h"
35630df6	33
30458aac	34	#define DRIVER_DESC "NCI NFC driver for ST_NCI"
35630df6 CR	35
35630df6 CR	36	/* ndlc header */
064d0047	37	#define ST_NCI_FRAME_HEADROOM 1
30458aac	38	#define ST_NCI_FRAME_TAILROOM 0
35630df6	39
ed06aeef CR	40	#define ST_NCI_I2C_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
ed06aeef CR	41	#define ST_NCI_I2C_MAX_SIZE 250 /* req 4.2.1 */
35630df6	42
ed06aeef	43	#define ST_NCI_I2C_DRIVER_NAME "st_nci_i2c"
35630df6	44
c1fc9136	45	#define ST_NCI_GPIO_NAME_RESET "reset"
35630df6	46
ed06aeef	47	struct st_nci_i2c_phy {
35630df6 CR	48	struct i2c_client *i2c_dev;
	49	struct llt_ndlc *ndlc;
	50
bb2496c3 CR	51	bool irq_active;
bb2496c3 CR	52
35630df6 CR	53	unsigned int gpio_reset;
35630df6 CR	54	unsigned int irq_polarity;
3648dc6d CR	55
3648dc6d CR	56	struct st_nci_se_status se_status;
35630df6 CR	57	};
35630df6 CR	58
ed06aeef	59	static int st_nci_i2c_enable(void *phy_id)
35630df6	60	{
ed06aeef	61	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	62
	63	gpio_set_value(phy->gpio_reset, 0);
	64	usleep_range(10000, 15000);
	65	gpio_set_value(phy->gpio_reset, 1);
35630df6 CR	66	usleep_range(80000, 85000);
35630df6 CR	67
bb2496c3	68	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
05f0939f	69	enable_irq(phy->i2c_dev->irq);
bb2496c3 CR	70	phy->irq_active = true;
bb2496c3 CR	71	}
05f0939f	72
35630df6 CR	73	return 0;
	74	}
	75
ed06aeef	76	static void st_nci_i2c_disable(void *phy_id)
35630df6	77	{
ed06aeef	78	struct st_nci_i2c_phy *phy = phy_id;
35630df6	79
05f0939f	80	disable_irq_nosync(phy->i2c_dev->irq);
bb2496c3	81	phy->irq_active = false;
35630df6 CR	82	}
35630df6 CR	83
35630df6 CR	84	/*
	85	* Writing a frame must not return the number of written bytes.
	86	* It must return either zero for success, or <0 for error.
	87	* In addition, it must not alter the skb
	88	*/
ed06aeef	89	static int st_nci_i2c_write(void phy_id, struct sk_buff skb)
35630df6 CR	90	{
35630df6 CR	91	int r = -1;
ed06aeef	92	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	93	struct i2c_client *client = phy->i2c_dev;
35630df6 CR	94
4294e320 CR	95	if (phy->ndlc->hard_fault != 0)
4294e320 CR	96	return phy->ndlc->hard_fault;
35630df6 CR	97
35630df6 CR	98	r = i2c_master_send(client, skb->data, skb->len);
d4a41d10	99	if (r < 0) { /* Retry, chip was in standby */
35630df6 CR	100	usleep_range(1000, 4000);
	101	r = i2c_master_send(client, skb->data, skb->len);
	102	}
	103
	104	if (r >= 0) {
	105	if (r != skb->len)
	106	r = -EREMOTEIO;
	107	else
	108	r = 0;
	109	}
	110
35630df6 CR	111	return r;
	112	}
	113
	114	/*
	115	* Reads an ndlc frame and returns it in a newly allocated sk_buff.
	116	* returns:
e7723b33	117	* 0 : if received frame is complete
35630df6 CR	118	* -EREMOTEIO : i2c read error (fatal)
35630df6 CR	119	* -EBADMSG : frame was incorrect and discarded
e7723b33	120	* -ENOMEM : cannot allocate skb, frame dropped
35630df6	121	*/
ed06aeef	122	static int st_nci_i2c_read(struct st_nci_i2c_phy *phy,
35630df6 CR	123	struct sk_buff **skb)
	124	{
	125	int r;
	126	u8 len;
ed06aeef	127	u8 buf[ST_NCI_I2C_MAX_SIZE];
35630df6 CR	128	struct i2c_client *client = phy->i2c_dev;
35630df6 CR	129
ed06aeef	130	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
d4a41d10	131	if (r < 0) { /* Retry, chip was in standby */
35630df6	132	usleep_range(1000, 4000);
ed06aeef	133	r = i2c_master_recv(client, buf, ST_NCI_I2C_MIN_SIZE);
ac633ba6 CR	134	}
ac633ba6 CR	135
ed06aeef	136	if (r != ST_NCI_I2C_MIN_SIZE)
35630df6	137	return -EREMOTEIO;
35630df6 CR	138
35630df6 CR	139	len = be16_to_cpu((__be16 ) (buf + 2));
ed06aeef	140	if (len > ST_NCI_I2C_MAX_SIZE) {
35630df6 CR	141	nfc_err(&client->dev, "invalid frame len\n");
	142	return -EBADMSG;
	143	}
	144
ed06aeef	145	*skb = alloc_skb(ST_NCI_I2C_MIN_SIZE + len, GFP_KERNEL);
35630df6 CR	146	if (*skb == NULL)
	147	return -ENOMEM;
	148
ed06aeef CR	149	skb_reserve(*skb, ST_NCI_I2C_MIN_SIZE);
	150	skb_put(*skb, ST_NCI_I2C_MIN_SIZE);
	151	memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);
35630df6 CR	152
	153	if (!len)
	154	return 0;
	155
	156	r = i2c_master_recv(client, buf, len);
	157	if (r != len) {
	158	kfree_skb(*skb);
	159	return -EREMOTEIO;
	160	}
	161
	162	skb_put(*skb, len);
ed06aeef	163	memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);
35630df6	164
35630df6 CR	165	return 0;
	166	}
	167
	168	/*
	169	* Reads an ndlc frame from the chip.
	170	*
30458aac	171	* On ST_NCI, IRQ goes in idle state when read starts.
35630df6	172	*/
ed06aeef	173	static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
35630df6	174	{
ed06aeef	175	struct st_nci_i2c_phy *phy = phy_id;
35630df6 CR	176	struct i2c_client *client;
	177	struct sk_buff *skb = NULL;
	178	int r;
	179
7274496f	180	if (!phy \|\| !phy->ndlc \|\| irq != phy->i2c_dev->irq) {
35630df6 CR	181	WARN_ON_ONCE(1);
	182	return IRQ_NONE;
	183	}
	184
	185	client = phy->i2c_dev;
	186	dev_dbg(&client->dev, "IRQ\n");
	187
4294e320	188	if (phy->ndlc->hard_fault)
35630df6 CR	189	return IRQ_HANDLED;
35630df6 CR	190
183fe2d0	191	if (!phy->ndlc->powered) {
ed06aeef	192	st_nci_i2c_disable(phy);
35630df6 CR	193	return IRQ_HANDLED;
	194	}
	195
ed06aeef	196	r = st_nci_i2c_read(phy, &skb);
4294e320	197	if (r == -EREMOTEIO \|\| r == -ENOMEM \|\| r == -EBADMSG)
35630df6	198	return IRQ_HANDLED;
35630df6 CR	199
	200	ndlc_recv(phy->ndlc, skb);
	201
	202	return IRQ_HANDLED;
	203	}
	204
	205	static struct nfc_phy_ops i2c_phy_ops = {
ed06aeef CR	206	.write = st_nci_i2c_write,
	207	.enable = st_nci_i2c_enable,
	208	.disable = st_nci_i2c_disable,
35630df6 CR	209	};
35630df6 CR	210
ed6a2f3f CR	211	static int st_nci_i2c_acpi_request_resources(struct i2c_client *client)
	212	{
	213	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
ed6a2f3f	214	struct gpio_desc *gpiod_reset;
4ac52a0f	215	struct device *dev = &client->dev;
27420fec	216	u8 tmp;
ed6a2f3f	217
ed6a2f3f CR	218	/* Get RESET GPIO from ACPI */
	219	gpiod_reset = devm_gpiod_get_index(dev, ST_NCI_GPIO_NAME_RESET, 1,
	220	GPIOD_OUT_HIGH);
	221	if (IS_ERR(gpiod_reset)) {
	222	nfc_err(dev, "Unable to get RESET GPIO\n");
	223	return -ENODEV;
	224	}
	225
	226	phy->gpio_reset = desc_to_gpio(gpiod_reset);
	227
	228	phy->irq_polarity = irq_get_trigger_type(client->irq);
	229
27420fec CR	230	phy->se_status.is_ese_present = false;
	231	phy->se_status.is_uicc_present = false;
	232
	233	if (device_property_present(dev, "ese-present")) {
	234	device_property_read_u8(dev, "ese-present", &tmp);
	235	phy->se_status.is_ese_present = tmp;
	236	}
	237
	238	if (device_property_present(dev, "uicc-present")) {
	239	device_property_read_u8(dev, "uicc-present", &tmp);
	240	phy->se_status.is_uicc_present = tmp;
	241	}
ed6a2f3f CR	242
	243	return 0;
	244	}
	245
ed06aeef	246	static int st_nci_i2c_of_request_resources(struct i2c_client *client)
35630df6	247	{
ed06aeef	248	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6 CR	249	struct device_node *pp;
	250	int gpio;
	251	int r;
	252
	253	pp = client->dev.of_node;
	254	if (!pp)
	255	return -ENODEV;
	256
	257	/* Get GPIO from device tree */
	258	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
	259	if (gpio < 0) {
	260	nfc_err(&client->dev,
	261	"Failed to retrieve reset-gpios from device tree\n");
	262	return gpio;
	263	}
	264
	265	/* GPIO request and configuration */
56ee645e	266	r = devm_gpio_request_one(&client->dev, gpio,
4c62c208	267	GPIOF_OUT_INIT_HIGH, ST_NCI_GPIO_NAME_RESET);
35630df6 CR	268	if (r) {
35630df6 CR	269	nfc_err(&client->dev, "Failed to request reset pin\n");
18159624	270	return r;
35630df6	271	}
35630df6 CR	272	phy->gpio_reset = gpio;
35630df6 CR	273
a80d0cb6	274	phy->irq_polarity = irq_get_trigger_type(client->irq);
35630df6	275
3648dc6d CR	276	phy->se_status.is_ese_present =
	277	of_property_read_bool(pp, "ese-present");
	278	phy->se_status.is_uicc_present =
	279	of_property_read_bool(pp, "uicc-present");
	280
35630df6 CR	281	return 0;
35630df6 CR	282	}
35630df6	283
ed06aeef	284	static int st_nci_i2c_request_resources(struct i2c_client *client)
35630df6	285	{
ed06aeef CR	286	struct st_nci_nfc_platform_data *pdata;
ed06aeef CR	287	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6	288	int r;
35630df6 CR	289
	290	pdata = client->dev.platform_data;
	291	if (pdata == NULL) {
	292	nfc_err(&client->dev, "No platform data\n");
	293	return -EINVAL;
	294	}
	295
	296	/* store for later use */
35630df6 CR	297	phy->gpio_reset = pdata->gpio_reset;
	298	phy->irq_polarity = pdata->irq_polarity;
	299
56ee645e	300	r = devm_gpio_request_one(&client->dev,
4c62c208 CR	301	phy->gpio_reset, GPIOF_OUT_INIT_HIGH,
4c62c208 CR	302	ST_NCI_GPIO_NAME_RESET);
35630df6 CR	303	if (r) {
35630df6 CR	304	pr_err("%s : reset gpio_request failed\n", __FILE__);
18159624	305	return r;
35630df6 CR	306	}
35630df6 CR	307
3648dc6d CR	308	phy->se_status.is_ese_present = pdata->is_ese_present;
	309	phy->se_status.is_uicc_present = pdata->is_uicc_present;
	310
35630df6 CR	311	return 0;
	312	}
	313
ed06aeef	314	static int st_nci_i2c_probe(struct i2c_client *client,
35630df6 CR	315	const struct i2c_device_id *id)
35630df6 CR	316	{
ed06aeef CR	317	struct st_nci_i2c_phy *phy;
ed06aeef CR	318	struct st_nci_nfc_platform_data *pdata;
35630df6 CR	319	int r;
	320
	321	dev_dbg(&client->dev, "%s\n", __func__);
	322	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
	323
	324	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
	325	nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
	326	return -ENODEV;
	327	}
	328
ed06aeef	329	phy = devm_kzalloc(&client->dev, sizeof(struct st_nci_i2c_phy),
35630df6	330	GFP_KERNEL);
3590ebc0	331	if (!phy)
35630df6	332	return -ENOMEM;
35630df6 CR	333
	334	phy->i2c_dev = client;
	335
	336	i2c_set_clientdata(client, phy);
	337
	338	pdata = client->dev.platform_data;
	339	if (!pdata && client->dev.of_node) {
ed06aeef	340	r = st_nci_i2c_of_request_resources(client);
35630df6 CR	341	if (r) {
	342	nfc_err(&client->dev, "No platform data\n");
	343	return r;
	344	}
	345	} else if (pdata) {
ed06aeef	346	r = st_nci_i2c_request_resources(client);
35630df6 CR	347	if (r) {
	348	nfc_err(&client->dev,
	349	"Cannot get platform resources\n");
	350	return r;
	351	}
ed6a2f3f CR	352	} else if (ACPI_HANDLE(&client->dev)) {
	353	r = st_nci_i2c_acpi_request_resources(client);
	354	if (r) {
	355	nfc_err(&client->dev, "Cannot get ACPI data\n");
	356	return r;
	357	}
35630df6 CR	358	} else {
35630df6 CR	359	nfc_err(&client->dev,
30458aac	360	"st_nci platform resources not available\n");
35630df6 CR	361	return -ENODEV;
	362	}
	363
7274496f	364	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,
30458aac	365	ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
3648dc6d	366	&phy->ndlc, &phy->se_status);
7274496f CR	367	if (r < 0) {
	368	nfc_err(&client->dev, "Unable to register ndlc layer\n");
	369	return r;
	370	}
	371
bb2496c3	372	phy->irq_active = true;
35630df6	373	r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
ed06aeef	374	st_nci_irq_thread_fn,
35630df6	375	phy->irq_polarity \| IRQF_ONESHOT,
ed06aeef	376	ST_NCI_DRIVER_NAME, phy);
7274496f	377	if (r < 0)
35630df6	378	nfc_err(&client->dev, "Unable to register IRQ handler\n");
35630df6	379
7274496f	380	return r;
35630df6 CR	381	}
35630df6 CR	382
ed06aeef	383	static int st_nci_i2c_remove(struct i2c_client *client)
35630df6	384	{
ed06aeef	385	struct st_nci_i2c_phy *phy = i2c_get_clientdata(client);
35630df6 CR	386
	387	dev_dbg(&client->dev, "%s\n", __func__);
	388
	389	ndlc_remove(phy->ndlc);
	390
35630df6 CR	391	return 0;
	392	}
	393
3252897f CR	394	static struct i2c_device_id st_nci_i2c_id_table[] = {
	395	{ST_NCI_DRIVER_NAME, 0},
	396	{}
	397	};
	398	MODULE_DEVICE_TABLE(i2c, st_nci_i2c_id_table);
	399
ed6a2f3f CR	400	static const struct acpi_device_id st_nci_i2c_acpi_match[] = {
	401	{"SMO2101"},
	402	{"SMO2102"},
	403	{}
	404	};
	405	MODULE_DEVICE_TABLE(acpi, st_nci_i2c_acpi_match);
	406
ed06aeef	407	static const struct of_device_id of_st_nci_i2c_match[] = {
1a94cb60	408	{ .compatible = "st,st21nfcb-i2c", },
35630df6	409	{ .compatible = "st,st21nfcb_i2c", },
ed06aeef	410	{ .compatible = "st,st21nfcc-i2c", },
35630df6 CR	411	{}
35630df6 CR	412	};
ed06aeef	413	MODULE_DEVICE_TABLE(of, of_st_nci_i2c_match);
35630df6	414
ed06aeef	415	static struct i2c_driver st_nci_i2c_driver = {
35630df6	416	.driver = {
ed06aeef CR	417	.name = ST_NCI_I2C_DRIVER_NAME,
ed06aeef CR	418	.of_match_table = of_match_ptr(of_st_nci_i2c_match),
ed6a2f3f	419	.acpi_match_table = ACPI_PTR(st_nci_i2c_acpi_match),
35630df6	420	},
ed06aeef CR	421	.probe = st_nci_i2c_probe,
	422	.id_table = st_nci_i2c_id_table,
	423	.remove = st_nci_i2c_remove,
35630df6	424	};
ed06aeef	425	module_i2c_driver(st_nci_i2c_driver);
35630df6 CR	426
	427	MODULE_LICENSE("GPL");
	428	MODULE_DESCRIPTION(DRIVER_DESC);