1 // SPDX-License-Identifier: GPL-2.0-only
3  * I2C link layer for the NXP NCI driver
6  * Copyright (C) 2012-2015  Intel Corporation. All rights reserved.
11  * Derived from PN544 device driver:
17 #include <linux/i2c.h>
26 #include "nxp-nci.h"
28 #define NXP_NCI_I2C_DRIVER_NAME	"nxp-nci_i2c"
40 			 * < 0 if hardware error occurred (e.g. i2c err)
50 	gpiod_set_value(phy->gpiod_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);  in nxp_nci_i2c_set_mode()
51 	gpiod_set_value(phy->gpiod_en, (mode != NXP_NCI_MODE_COLD) ? 1 : 0);  in nxp_nci_i2c_set_mode()
55 		phy->hard_fault = 0;  in nxp_nci_i2c_set_mode()
64 	struct i2c_client *client = phy->i2c_dev;  in nxp_nci_i2c_write()
66 	if (phy->hard_fault != 0)  in nxp_nci_i2c_write()
67 		return phy->hard_fault;  in nxp_nci_i2c_write()
69 	r = i2c_master_send(client, skb->data, skb->len);  in nxp_nci_i2c_write()
73 		r = i2c_master_send(client, skb->data, skb->len);  in nxp_nci_i2c_write()
77 		nfc_err(&client->dev, "Error %d on I2C send\n", r);  in nxp_nci_i2c_write()
78 	} else if (r != skb->len) {  in nxp_nci_i2c_write()
79 		nfc_err(&client->dev,  in nxp_nci_i2c_write()
81 			r, skb->len);  in nxp_nci_i2c_write()
82 		r = -EREMOTEIO;  in nxp_nci_i2c_write()
99 	struct i2c_client *client = phy->i2c_dev;  in nxp_nci_i2c_fw_read()
108 		nfc_err(&client->dev, "Incorrect header length: %u\n", r);  in nxp_nci_i2c_fw_read()
109 		r = -EBADMSG;  in nxp_nci_i2c_fw_read()
118 		r = -ENOMEM;  in nxp_nci_i2c_fw_read()
128 		nfc_err(&client->dev,  in nxp_nci_i2c_fw_read()
131 		r = -EBADMSG;  in nxp_nci_i2c_fw_read()
147 	struct i2c_client *client = phy->i2c_dev;  in nxp_nci_i2c_nci_read()
154 		nfc_err(&client->dev, "Incorrect header length: %u\n", r);  in nxp_nci_i2c_nci_read()
155 		r = -EBADMSG;  in nxp_nci_i2c_nci_read()
161 		r = -ENOMEM;  in nxp_nci_i2c_nci_read()
174 		nfc_err(&client->dev,  in nxp_nci_i2c_nci_read()
177 		r = -EBADMSG;  in nxp_nci_i2c_nci_read()
198 	if (!phy || !phy->ndev)  in nxp_nci_i2c_irq_thread_fn()
201 	client = phy->i2c_dev;  in nxp_nci_i2c_irq_thread_fn()
203 	if (!client || irq != client->irq)  in nxp_nci_i2c_irq_thread_fn()
206 	info = nci_get_drvdata(phy->ndev);  in nxp_nci_i2c_irq_thread_fn()
211 	mutex_lock(&info->info_lock);  in nxp_nci_i2c_irq_thread_fn()
213 	if (phy->hard_fault != 0)  in nxp_nci_i2c_irq_thread_fn()
216 	switch (info->mode) {  in nxp_nci_i2c_irq_thread_fn()
224 		r = -EREMOTEIO;  in nxp_nci_i2c_irq_thread_fn()
228 	if (r == -EREMOTEIO) {  in nxp_nci_i2c_irq_thread_fn()
229 		phy->hard_fault = r;  in nxp_nci_i2c_irq_thread_fn()
230 		if (info->mode == NXP_NCI_MODE_FW)  in nxp_nci_i2c_irq_thread_fn()
231 			nxp_nci_fw_recv_frame(phy->ndev, NULL);  in nxp_nci_i2c_irq_thread_fn()
234 		nfc_err(&client->dev, "Read failed with error %d\n", r);  in nxp_nci_i2c_irq_thread_fn()
238 	switch (info->mode) {  in nxp_nci_i2c_irq_thread_fn()
240 		nci_recv_frame(phy->ndev, skb);  in nxp_nci_i2c_irq_thread_fn()
243 		nxp_nci_fw_recv_frame(phy->ndev, skb);  in nxp_nci_i2c_irq_thread_fn()
250 	mutex_unlock(&info->info_lock);  in nxp_nci_i2c_irq_thread_fn()
261 	{ "enable-gpios", &enable_gpios, 1 },
262 	{ "firmware-gpios", &firmware_gpios, 1 },
269 	struct device *dev = &client->dev;  in nxp_nci_i2c_probe()
273 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in nxp_nci_i2c_probe()
274 		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");  in nxp_nci_i2c_probe()
275 		return -ENODEV;  in nxp_nci_i2c_probe()
278 	phy = devm_kzalloc(&client->dev, sizeof(struct nxp_nci_i2c_phy),  in nxp_nci_i2c_probe()
281 		return -ENOMEM;  in nxp_nci_i2c_probe()
283 	phy->i2c_dev = client;  in nxp_nci_i2c_probe()
290 	phy->gpiod_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in nxp_nci_i2c_probe()
291 	if (IS_ERR(phy->gpiod_en)) {  in nxp_nci_i2c_probe()
293 		return PTR_ERR(phy->gpiod_en);  in nxp_nci_i2c_probe()
296 	phy->gpiod_fw = devm_gpiod_get_optional(dev, "firmware", GPIOD_OUT_LOW);  in nxp_nci_i2c_probe()
297 	if (IS_ERR(phy->gpiod_fw)) {  in nxp_nci_i2c_probe()
299 		return PTR_ERR(phy->gpiod_fw);  in nxp_nci_i2c_probe()
302 	r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops,  in nxp_nci_i2c_probe()
303 			  NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev);  in nxp_nci_i2c_probe()
307 	r = request_threaded_irq(client->irq, NULL,  in nxp_nci_i2c_probe()
312 		nfc_err(&client->dev, "Unable to register IRQ handler\n");  in nxp_nci_i2c_probe()
321 	nxp_nci_remove(phy->ndev);  in nxp_nci_i2c_remove()
322 	free_irq(client->irq, phy);  in nxp_nci_i2c_remove()
326 	{"nxp-nci_i2c", 0},
329 MODULE_DEVICE_TABLE(i2c, nxp_nci_i2c_id_table);
332 	{ .compatible = "nxp,nxp-nci-i2c", },
360 MODULE_DESCRIPTION("I2C driver for NXP NCI NFC controllers");