1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
18 #include "st-nci.h"
47 	gpiod_set_value(phy->gpiod_reset, 0);  in st_nci_i2c_enable()
49 	gpiod_set_value(phy->gpiod_reset, 1);  in st_nci_i2c_enable()
52 	if (phy->ndlc->powered == 0 && phy->irq_active == 0) {  in st_nci_i2c_enable()
53 		enable_irq(phy->i2c_dev->irq);  in st_nci_i2c_enable()
54 		phy->irq_active = true;  in st_nci_i2c_enable()
64 	disable_irq_nosync(phy->i2c_dev->irq);  in st_nci_i2c_disable()
65 	phy->irq_active = false;  in st_nci_i2c_disable()
77 	struct i2c_client *client = phy->i2c_dev;  in st_nci_i2c_write()
79 	if (phy->ndlc->hard_fault != 0)  in st_nci_i2c_write()
80 		return phy->ndlc->hard_fault;  in st_nci_i2c_write()
82 	r = i2c_master_send(client, skb->data, skb->len);  in st_nci_i2c_write()
85 		r = i2c_master_send(client, skb->data, skb->len);  in st_nci_i2c_write()
89 		if (r != skb->len)  in st_nci_i2c_write()
90 			r = -EREMOTEIO;  in st_nci_i2c_write()
102  * -EREMOTEIO : i2c read error (fatal)
103  * -EBADMSG : frame was incorrect and discarded
104  * -ENOMEM : cannot allocate skb, frame dropped
112 	struct i2c_client *client = phy->i2c_dev;  in st_nci_i2c_read()
121 		return -EREMOTEIO;  in st_nci_i2c_read()
125 		nfc_err(&client->dev, "invalid frame len\n");  in st_nci_i2c_read()
126 		return -EBADMSG;  in st_nci_i2c_read()
131 		return -ENOMEM;  in st_nci_i2c_read()
135 	memcpy((*skb)->data, buf, ST_NCI_I2C_MIN_SIZE);  in st_nci_i2c_read()
143 		return -EREMOTEIO;  in st_nci_i2c_read()
147 	memcpy((*skb)->data + ST_NCI_I2C_MIN_SIZE, buf, len);  in st_nci_i2c_read()
163 	if (!phy || !phy->ndlc || irq != phy->i2c_dev->irq) {  in st_nci_irq_thread_fn()
168 	if (phy->ndlc->hard_fault)  in st_nci_irq_thread_fn()
171 	if (!phy->ndlc->powered) {  in st_nci_irq_thread_fn()
177 	if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)  in st_nci_irq_thread_fn()
180 	ndlc_recv(phy->ndlc, skb);  in st_nci_irq_thread_fn()
194 	{ "reset-gpios", &reset_gpios, 1 },
201 	struct device *dev = &client->dev;  in st_nci_i2c_probe()
205 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in st_nci_i2c_probe()
206 		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");  in st_nci_i2c_probe()
207 		return -ENODEV;  in st_nci_i2c_probe()
212 		return -ENOMEM;  in st_nci_i2c_probe()
214 	phy->i2c_dev = client;  in st_nci_i2c_probe()
223 	phy->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);  in st_nci_i2c_probe()
224 	if (IS_ERR(phy->gpiod_reset)) {  in st_nci_i2c_probe()
226 		return -ENODEV;  in st_nci_i2c_probe()
229 	phy->se_status.is_ese_present =  in st_nci_i2c_probe()
230 				device_property_read_bool(dev, "ese-present");  in st_nci_i2c_probe()
231 	phy->se_status.is_uicc_present =  in st_nci_i2c_probe()
232 				device_property_read_bool(dev, "uicc-present");  in st_nci_i2c_probe()
234 	r = ndlc_probe(phy, &i2c_phy_ops, &client->dev,  in st_nci_i2c_probe()
236 			&phy->ndlc, &phy->se_status);  in st_nci_i2c_probe()
238 		nfc_err(&client->dev, "Unable to register ndlc layer\n");  in st_nci_i2c_probe()
242 	phy->irq_active = true;  in st_nci_i2c_probe()
243 	r = devm_request_threaded_irq(&client->dev, client->irq, NULL,  in st_nci_i2c_probe()
248 		nfc_err(&client->dev, "Unable to register IRQ handler\n");  in st_nci_i2c_probe()
257 	ndlc_remove(phy->ndlc);  in st_nci_i2c_remove()
274 	{ .compatible = "st,st21nfcb-i2c", },
276 	{ .compatible = "st,st21nfcc-i2c", },