[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/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 <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"

#define ST_NCI_GPIO_NAME_RESET "reset"

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_acpi_request_resources(struct spi_device *spi_dev)
{
	struct st_nci_spi_phy *phy = spi_get_drvdata(spi_dev);
	struct gpio_desc *gpiod_reset;
	struct device *dev = &spi_dev->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(spi_dev->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);
		tmp = phy->se_status.is_ese_present;
	}

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

	return 0;
}

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, ST_NCI_GPIO_NAME_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,
			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_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 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;
	}

	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 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>
	22	#include <linux/gpio.h>
60cd6d89	23	#include <linux/gpio/consumer.h>
2bc4d4f8 CR	24	#include <linux/of_irq.h>
2bc4d4f8 CR	25	#include <linux/of_gpio.h>
60cd6d89	26	#include <linux/acpi.h>
2bc4d4f8 CR	27	#include <linux/interrupt.h>
	28	#include <linux/delay.h>
	29	#include <linux/nfc.h>
a1269dd1	30	#include <net/nfc/nci.h>
2bc4d4f8 CR	31	#include <linux/platform_data/st-nci.h>
2bc4d4f8 CR	32
e67e7e59	33	#include "st-nci.h"
2bc4d4f8 CR	34
	35	#define DRIVER_DESC "NCI NFC driver for ST_NCI"
	36
	37	/* ndlc header */
	38	#define ST_NCI_FRAME_HEADROOM 1
ba2c231c	39	#define ST_NCI_FRAME_TAILROOM 0
2bc4d4f8 CR	40
	41	#define ST_NCI_SPI_MIN_SIZE 4 /* PCB(1) + NCI Packet header(3) */
	42	#define ST_NCI_SPI_MAX_SIZE 250 /* req 4.2.1 */
	43
	44	#define ST_NCI_SPI_DRIVER_NAME "st_nci_spi"
	45
de72dbc5	46	#define ST_NCI_GPIO_NAME_RESET "reset"
4c62c208	47
2bc4d4f8 CR	48	struct st_nci_spi_phy {
	49	struct spi_device *spi_dev;
	50	struct llt_ndlc *ndlc;
	51
bb2496c3 CR	52	bool irq_active;
bb2496c3 CR	53
2bc4d4f8 CR	54	unsigned int gpio_reset;
2bc4d4f8 CR	55	unsigned int irq_polarity;
3648dc6d CR	56
3648dc6d CR	57	struct st_nci_se_status se_status;
2bc4d4f8 CR	58	};
2bc4d4f8 CR	59
2bc4d4f8 CR	60	static int st_nci_spi_enable(void *phy_id)
	61	{
	62	struct st_nci_spi_phy *phy = phy_id;
	63
	64	gpio_set_value(phy->gpio_reset, 0);
	65	usleep_range(10000, 15000);
	66	gpio_set_value(phy->gpio_reset, 1);
	67	usleep_range(80000, 85000);
	68
bb2496c3	69	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {
2bc4d4f8	70	enable_irq(phy->spi_dev->irq);
bb2496c3 CR	71	phy->irq_active = true;
bb2496c3 CR	72	}
2bc4d4f8 CR	73
	74	return 0;
	75	}
	76
	77	static void st_nci_spi_disable(void *phy_id)
	78	{
	79	struct st_nci_spi_phy *phy = phy_id;
	80
	81	disable_irq_nosync(phy->spi_dev->irq);
bb2496c3	82	phy->irq_active = false;
2bc4d4f8 CR	83	}
	84
	85	/*
	86	* Writing a frame must not return the number of written bytes.
	87	* It must return either zero for success, or <0 for error.
	88	* In addition, it must not alter the skb
	89	*/
	90	static int st_nci_spi_write(void phy_id, struct sk_buff skb)
	91	{
	92	int r;
	93	struct st_nci_spi_phy *phy = phy_id;
	94	struct spi_device *dev = phy->spi_dev;
	95	struct sk_buff *skb_rx;
a1269dd1 CR	96	u8 buf[ST_NCI_SPI_MAX_SIZE + NCI_DATA_HDR_SIZE +
a1269dd1 CR	97	ST_NCI_FRAME_HEADROOM + ST_NCI_FRAME_TAILROOM];
2bc4d4f8 CR	98	struct spi_transfer spi_xfer = {
	99	.tx_buf = skb->data,
	100	.rx_buf = buf,
	101	.len = skb->len,
	102	};
	103
2bc4d4f8 CR	104	if (phy->ndlc->hard_fault != 0)
	105	return phy->ndlc->hard_fault;
	106
	107	r = spi_sync_transfer(dev, &spi_xfer, 1);
	108	/*
	109	* We may have received some valuable data on miso line.
	110	* Send them back in the ndlc state machine.
	111	*/
	112	if (!r) {
	113	skb_rx = alloc_skb(skb->len, GFP_KERNEL);
	114	if (!skb_rx) {
	115	r = -ENOMEM;
	116	goto exit;
	117	}
	118
	119	skb_put(skb_rx, skb->len);
	120	memcpy(skb_rx->data, buf, skb->len);
	121	ndlc_recv(phy->ndlc, skb_rx);
	122	}
	123
	124	exit:
	125	return r;
	126	}
	127
	128	/*
	129	* Reads an ndlc frame and returns it in a newly allocated sk_buff.
	130	* returns:
	131	* 0 : if received frame is complete
	132	* -EREMOTEIO : i2c read error (fatal)
	133	* -EBADMSG : frame was incorrect and discarded
	134	* -ENOMEM : cannot allocate skb, frame dropped
	135	*/
	136	static int st_nci_spi_read(struct st_nci_spi_phy *phy,
	137	struct sk_buff **skb)
	138	{
	139	int r;
	140	u8 len;
	141	u8 buf[ST_NCI_SPI_MAX_SIZE];
	142	struct spi_device *dev = phy->spi_dev;
	143	struct spi_transfer spi_xfer = {
	144	.rx_buf = buf,
	145	.len = ST_NCI_SPI_MIN_SIZE,
	146	};
	147
	148	r = spi_sync_transfer(dev, &spi_xfer, 1);
	149	if (r < 0)
	150	return -EREMOTEIO;
	151
	152	len = be16_to_cpu((__be16 ) (buf + 2));
	153	if (len > ST_NCI_SPI_MAX_SIZE) {
	154	nfc_err(&dev->dev, "invalid frame len\n");
	155	phy->ndlc->hard_fault = 1;
	156	return -EBADMSG;
	157	}
	158
	159	*skb = alloc_skb(ST_NCI_SPI_MIN_SIZE + len, GFP_KERNEL);
	160	if (*skb == NULL)
	161	return -ENOMEM;
	162
	163	skb_reserve(*skb, ST_NCI_SPI_MIN_SIZE);
	164	skb_put(*skb, ST_NCI_SPI_MIN_SIZE);
	165	memcpy((*skb)->data, buf, ST_NCI_SPI_MIN_SIZE);
	166
	167	if (!len)
168	return 0;
169
170	spi_xfer.len = len;
171	r = spi_sync_transfer(dev, &spi_xfer, 1);
172	if (r < 0) {
173	kfree_skb(*skb);
174	return -EREMOTEIO;
175	}
176
177	skb_put(*skb, len);
178	memcpy((*skb)->data + ST_NCI_SPI_MIN_SIZE, buf, len);
179
2bc4d4f8 CR	180	return 0;
	181	}
	182
	183	/*
	184	* Reads an ndlc frame from the chip.
	185	*
	186	* On ST21NFCB, IRQ goes in idle state when read starts.
	187	*/
	188	static irqreturn_t st_nci_irq_thread_fn(int irq, void *phy_id)
	189	{
	190	struct st_nci_spi_phy *phy = phy_id;
	191	struct spi_device *dev;
	192	struct sk_buff *skb = NULL;
	193	int r;
	194
	195	if (!phy \|\| !phy->ndlc \|\| irq != phy->spi_dev->irq) {
	196	WARN_ON_ONCE(1);
	197	return IRQ_NONE;
	198	}
	199
	200	dev = phy->spi_dev;
	201	dev_dbg(&dev->dev, "IRQ\n");
	202
	203	if (phy->ndlc->hard_fault)
	204	return IRQ_HANDLED;
	205
	206	if (!phy->ndlc->powered) {
	207	st_nci_spi_disable(phy);
	208	return IRQ_HANDLED;
	209	}
	210
	211	r = st_nci_spi_read(phy, &skb);
	212	if (r == -EREMOTEIO \|\| r == -ENOMEM \|\| r == -EBADMSG)
	213	return IRQ_HANDLED;
	214
	215	ndlc_recv(phy->ndlc, skb);
	216
	217	return IRQ_HANDLED;
	218	}
	219
	220	static struct nfc_phy_ops spi_phy_ops = {
	221	.write = st_nci_spi_write,
	222	.enable = st_nci_spi_enable,
	223	.disable = st_nci_spi_disable,
	224	};
	225
60cd6d89 CR	226	static int st_nci_spi_acpi_request_resources(struct spi_device *spi_dev)
	227	{
	228	struct st_nci_spi_phy *phy = spi_get_drvdata(spi_dev);
60cd6d89	229	struct gpio_desc *gpiod_reset;
1f34b204	230	struct device *dev = &spi_dev->dev;
27420fec	231	u8 tmp;
60cd6d89	232
60cd6d89 CR	233	/* Get RESET GPIO from ACPI */
	234	gpiod_reset = devm_gpiod_get_index(dev, ST_NCI_GPIO_NAME_RESET, 1,
	235	GPIOD_OUT_HIGH);
	236	if (IS_ERR(gpiod_reset)) {
	237	nfc_err(dev, "Unable to get RESET GPIO\n");
	238	return -ENODEV;
	239	}
	240
	241	phy->gpio_reset = desc_to_gpio(gpiod_reset);
	242
	243	phy->irq_polarity = irq_get_trigger_type(spi_dev->irq);
	244
27420fec CR	245	phy->se_status.is_ese_present = false;
	246	phy->se_status.is_uicc_present = false;
	247
	248	if (device_property_present(dev, "ese-present")) {
	249	device_property_read_u8(dev, "ese-present", &tmp);
	250	tmp = phy->se_status.is_ese_present;
	251	}
	252
	253	if (device_property_present(dev, "uicc-present")) {
	254	device_property_read_u8(dev, "uicc-present", &tmp);
	255	tmp = phy->se_status.is_uicc_present;
	256	}
60cd6d89 CR	257
	258	return 0;
	259	}
	260
2bc4d4f8 CR	261	static int st_nci_spi_of_request_resources(struct spi_device *dev)
	262	{
	263	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	264	struct device_node *pp;
	265	int gpio;
	266	int r;
	267
	268	pp = dev->dev.of_node;
	269	if (!pp)
	270	return -ENODEV;
	271
	272	/* Get GPIO from device tree */
	273	gpio = of_get_named_gpio(pp, "reset-gpios", 0);
	274	if (gpio < 0) {
	275	nfc_err(&dev->dev,
	276	"Failed to retrieve reset-gpios from device tree\n");
	277	return gpio;
	278	}
	279
	280	/* GPIO request and configuration */
	281	r = devm_gpio_request_one(&dev->dev, gpio,
4c62c208	282	GPIOF_OUT_INIT_HIGH, ST_NCI_GPIO_NAME_RESET);
2bc4d4f8 CR	283	if (r) {
	284	nfc_err(&dev->dev, "Failed to request reset pin\n");
	285	return r;
	286	}
	287	phy->gpio_reset = gpio;
	288
	289	phy->irq_polarity = irq_get_trigger_type(dev->irq);
	290
3648dc6d CR	291	phy->se_status.is_ese_present =
	292	of_property_read_bool(pp, "ese-present");
	293	phy->se_status.is_uicc_present =
	294	of_property_read_bool(pp, "uicc-present");
	295
2bc4d4f8 CR	296	return 0;
2bc4d4f8 CR	297	}
2bc4d4f8 CR	298
	299	static int st_nci_spi_request_resources(struct spi_device *dev)
	300	{
	301	struct st_nci_nfc_platform_data *pdata;
	302	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	303	int r;
	304
	305	pdata = dev->dev.platform_data;
	306	if (pdata == NULL) {
	307	nfc_err(&dev->dev, "No platform data\n");
	308	return -EINVAL;
	309	}
	310
	311	/* store for later use */
	312	phy->gpio_reset = pdata->gpio_reset;
	313	phy->irq_polarity = pdata->irq_polarity;
	314
	315	r = devm_gpio_request_one(&dev->dev,
4c62c208 CR	316	phy->gpio_reset, GPIOF_OUT_INIT_HIGH,
4c62c208 CR	317	ST_NCI_GPIO_NAME_RESET);
2bc4d4f8 CR	318	if (r) {
	319	pr_err("%s : reset gpio_request failed\n", __FILE__);
	320	return r;
	321	}
	322
3648dc6d CR	323	phy->se_status.is_ese_present = pdata->is_ese_present;
	324	phy->se_status.is_uicc_present = pdata->is_uicc_present;
	325
2bc4d4f8 CR	326	return 0;
	327	}
	328
	329	static int st_nci_spi_probe(struct spi_device *dev)
	330	{
	331	struct st_nci_spi_phy *phy;
	332	struct st_nci_nfc_platform_data *pdata;
	333	int r;
	334
	335	dev_dbg(&dev->dev, "%s\n", __func__);
	336	dev_dbg(&dev->dev, "IRQ: %d\n", dev->irq);
	337
	338	/* Check SPI platform functionnalities */
	339	if (!dev) {
	340	pr_debug("%s: dev is NULL. Device is not accessible.\n",
	341	__func__);
	342	return -ENODEV;
	343	}
	344
	345	phy = devm_kzalloc(&dev->dev, sizeof(struct st_nci_spi_phy),
	346	GFP_KERNEL);
	347	if (!phy)
	348	return -ENOMEM;
	349
	350	phy->spi_dev = dev;
	351
	352	spi_set_drvdata(dev, phy);
	353
	354	pdata = dev->dev.platform_data;
	355	if (!pdata && dev->dev.of_node) {
	356	r = st_nci_spi_of_request_resources(dev);
	357	if (r) {
	358	nfc_err(&dev->dev, "No platform data\n");
	359	return r;
	360	}
	361	} else if (pdata) {
	362	r = st_nci_spi_request_resources(dev);
	363	if (r) {
	364	nfc_err(&dev->dev,
	365	"Cannot get platform resources\n");
	366	return r;
	367	}
60cd6d89 CR	368	} else if (ACPI_HANDLE(&dev->dev)) {
	369	r = st_nci_spi_acpi_request_resources(dev);
	370	if (r) {
	371	nfc_err(&dev->dev, "Cannot get ACPI data\n");
	372	return r;
	373	}
2bc4d4f8 CR	374	} else {
	375	nfc_err(&dev->dev,
	376	"st_nci platform resources not available\n");
	377	return -ENODEV;
	378	}
	379
	380	r = ndlc_probe(phy, &spi_phy_ops, &dev->dev,
	381	ST_NCI_FRAME_HEADROOM, ST_NCI_FRAME_TAILROOM,
3648dc6d	382	&phy->ndlc, &phy->se_status);
2bc4d4f8 CR	383	if (r < 0) {
	384	nfc_err(&dev->dev, "Unable to register ndlc layer\n");
	385	return r;
	386	}
	387
bb2496c3	388	phy->irq_active = true;
2bc4d4f8 CR	389	r = devm_request_threaded_irq(&dev->dev, dev->irq, NULL,
	390	st_nci_irq_thread_fn,
	391	phy->irq_polarity \| IRQF_ONESHOT,
	392	ST_NCI_SPI_DRIVER_NAME, phy);
	393	if (r < 0)
	394	nfc_err(&dev->dev, "Unable to register IRQ handler\n");
	395
	396	return r;
	397	}
	398
	399	static int st_nci_spi_remove(struct spi_device *dev)
	400	{
	401	struct st_nci_spi_phy *phy = spi_get_drvdata(dev);
	402
	403	dev_dbg(&dev->dev, "%s\n", __func__);
	404
	405	ndlc_remove(phy->ndlc);
	406
	407	return 0;
	408	}
	409
3252897f CR	410	static struct spi_device_id st_nci_spi_id_table[] = {
	411	{ST_NCI_SPI_DRIVER_NAME, 0},
	412	{}
	413	};
	414	MODULE_DEVICE_TABLE(spi, st_nci_spi_id_table);
	415
60cd6d89 CR	416	static const struct acpi_device_id st_nci_spi_acpi_match[] = {
	417	{"SMO2101", 0},
	418	{}
	419	};
	420	MODULE_DEVICE_TABLE(acpi, st_nci_spi_acpi_match);
	421
2bc4d4f8 CR	422	static const struct of_device_id of_st_nci_spi_match[] = {
	423	{ .compatible = "st,st21nfcb-spi", },
	424	{}
	425	};
	426	MODULE_DEVICE_TABLE(of, of_st_nci_spi_match);
2bc4d4f8 CR	427
	428	static struct spi_driver st_nci_spi_driver = {
	429	.driver = {
2bc4d4f8 CR	430	.name = ST_NCI_SPI_DRIVER_NAME,
2bc4d4f8 CR	431	.of_match_table = of_match_ptr(of_st_nci_spi_match),
60cd6d89	432	.acpi_match_table = ACPI_PTR(st_nci_spi_acpi_match),
2bc4d4f8 CR	433	},
	434	.probe = st_nci_spi_probe,
	435	.id_table = st_nci_spi_id_table,
	436	.remove = st_nci_spi_remove,
	437	};
2bc4d4f8 CR	438	module_spi_driver(st_nci_spi_driver);
	439
	440	MODULE_LICENSE("GPL");
	441	MODULE_DESCRIPTION(DRIVER_DESC);