1 // SPDX-License-Identifier: GPL-2.0-only
3  * SPI Link Layer for ST NCI based Driver
4  * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
10 #include <linux/spi/spi.h>
19 #include "st-nci.h"
48 	gpiod_set_value(phy->gpiod_reset, 0);  in st_nci_spi_enable()
50 	gpiod_set_value(phy->gpiod_reset, 1);  in st_nci_spi_enable()
53 	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {  in st_nci_spi_enable()
54 		enable_irq(phy->spi_dev->irq);  in st_nci_spi_enable()
55 		phy->irq_active = true;  in st_nci_spi_enable()
65 	disable_irq_nosync(phy->spi_dev->irq);  in st_nci_spi_disable()
66 	phy->irq_active = false;  in st_nci_spi_disable()
78 	struct spi_device *dev = phy->spi_dev;  in st_nci_spi_write()
83 		.tx_buf = skb->data,  in st_nci_spi_write()
85 		.len = skb->len,  in st_nci_spi_write()
88 	if (phy->ndlc->hard_fault != 0)  in st_nci_spi_write()
89 		return phy->ndlc->hard_fault;  in st_nci_spi_write()
97 		skb_rx = alloc_skb(skb->len, GFP_KERNEL);  in st_nci_spi_write()
99 			return -ENOMEM;  in st_nci_spi_write()
101 		skb_put(skb_rx, skb->len);  in st_nci_spi_write()
102 		memcpy(skb_rx->data, buf, skb->len);  in st_nci_spi_write()
103 		ndlc_recv(phy->ndlc, skb_rx);  in st_nci_spi_write()
113  * -EREMOTEIO : i2c read error (fatal)
114  * -EBADMSG : frame was incorrect and discarded
115  * -ENOMEM : cannot allocate skb, frame dropped
123 	struct spi_device *dev = phy->spi_dev;  in st_nci_spi_read()
131 		return -EREMOTEIO;  in st_nci_spi_read()
135 		nfc_err(&dev->dev, "invalid frame len\n");  in st_nci_spi_read()
136 		phy->ndlc->hard_fault = 1;  in st_nci_spi_read()
137 		return -EBADMSG;  in st_nci_spi_read()
142 		return -ENOMEM;  in st_nci_spi_read()
146 	memcpy((*skb)->data, buf, ST_NCI_SPI_MIN_SIZE);  in st_nci_spi_read()
155 		return -EREMOTEIO;  in st_nci_spi_read()
159 	memcpy((*skb)->data + ST_NCI_SPI_MIN_SIZE, buf, len);  in st_nci_spi_read()
167  * On ST21NFCB, IRQ goes in idle state when read starts.
175 	if (!phy || !phy->ndlc || irq != phy->spi_dev->irq) {  in st_nci_irq_thread_fn()
180 	if (phy->ndlc->hard_fault)  in st_nci_irq_thread_fn()
183 	if (!phy->ndlc->powered) {  in st_nci_irq_thread_fn()
189 	if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)  in st_nci_irq_thread_fn()
192 	ndlc_recv(phy->ndlc, skb);  in st_nci_irq_thread_fn()
206 	{ "reset-gpios", &reset_gpios, 1 },
215 	/* Check SPI platform functionnalities */  in st_nci_spi_probe()
219 		return -ENODEV;  in st_nci_spi_probe()
222 	phy = devm_kzalloc(&dev->dev, sizeof(struct st_nci_spi_phy),  in st_nci_spi_probe()
225 		return -ENOMEM;  in st_nci_spi_probe()
227 	phy->spi_dev = dev;  in st_nci_spi_probe()
231 	r = devm_acpi_dev_add_driver_gpios(&dev->dev, acpi_st_nci_gpios);  in st_nci_spi_probe()
233 		dev_dbg(&dev->dev, "Unable to add GPIO mapping table\n");  in st_nci_spi_probe()
236 	phy->gpiod_reset = devm_gpiod_get(&dev->dev, "reset", GPIOD_OUT_HIGH);  in st_nci_spi_probe()
237 	if (IS_ERR(phy->gpiod_reset)) {  in st_nci_spi_probe()
238 		nfc_err(&dev->dev, "Unable to get RESET GPIO\n");  in st_nci_spi_probe()
239 		return PTR_ERR(phy->gpiod_reset);  in st_nci_spi_probe()
242 	phy->se_status.is_ese_present =  in st_nci_spi_probe()
243 			device_property_read_bool(&dev->dev, "ese-present");  in st_nci_spi_probe()
244 	phy->se_status.is_uicc_present =  in st_nci_spi_probe()
245 			device_property_read_bool(&dev->dev, "uicc-present");  in st_nci_spi_probe()
247 	r = ndlc_probe(phy, &spi_phy_ops, &dev->dev,  in st_nci_spi_probe()
249 			&phy->ndlc, &phy->se_status);  in st_nci_spi_probe()
251 		nfc_err(&dev->dev, "Unable to register ndlc layer\n");  in st_nci_spi_probe()
255 	phy->irq_active = true;  in st_nci_spi_probe()
256 	r = devm_request_threaded_irq(&dev->dev, dev->irq, NULL,  in st_nci_spi_probe()
261 		nfc_err(&dev->dev, "Unable to register IRQ handler\n");  in st_nci_spi_probe()
270 	ndlc_remove(phy->ndlc);  in st_nci_spi_remove()
275 	{"st21nfcb-spi", 0},
278 MODULE_DEVICE_TABLE(spi, st_nci_spi_id_table);
287 	{ .compatible = "st,st21nfcb-spi", },