1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -------------------------------------------------------------------------
3  * Copyright (C) 2014-2016, Intel Corporation
5  * -------------------------------------------------------------------------
10 #include <linux/i2c.h>
12 #include <linux/nfc.h>
15 #include <net/nfc/nfc.h>
16 #include <net/nfc/nci_core.h>
22 #define FDP_DP_CLOCK_TYPE_NAME	"clock-type"
23 #define FDP_DP_CLOCK_FREQ_NAME	"clock-freq"
24 #define FDP_DP_FW_VSC_CFG_NAME	"fw-vsc-cfg"
37 		       16, 1, (skb)->data, (skb)->len, 0)
41 	/* Reset RST/WakeUP for at least 100 micro-second */  in fdp_nci_i2c_reset()
42 	gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_OFF);  in fdp_nci_i2c_reset()
44 	gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_ON);  in fdp_nci_i2c_reset()
70 	len = skb->len;  in fdp_nci_i2c_add_len_lrc()
76 		lrc ^= skb->data[i];  in fdp_nci_i2c_add_len_lrc()
84 	skb_trim(skb, skb->len - FDP_FRAME_TAILROOM);  in fdp_nci_i2c_remove_len_lrc()
90 	struct i2c_client *client = phy->i2c_dev;  in fdp_nci_i2c_write()
93 	if (phy->hard_fault != 0)  in fdp_nci_i2c_write()
94 		return phy->hard_fault;  in fdp_nci_i2c_write()
97 	fdp_nci_i2c_dump_skb(&client->dev, "fdp_wr", skb);  in fdp_nci_i2c_write()
99 	r = i2c_master_send(client, skb->data, skb->len);  in fdp_nci_i2c_write()
100 	if (r == -EREMOTEIO) {  /* Retry, chip was in standby */  in fdp_nci_i2c_write()
102 		r = i2c_master_send(client, skb->data, skb->len);  in fdp_nci_i2c_write()
105 	if (r < 0 || r != skb->len)  in fdp_nci_i2c_write()
106 		dev_dbg(&client->dev, "%s: error err=%d len=%d\n",  in fdp_nci_i2c_write()
107 			__func__, r, skb->len);  in fdp_nci_i2c_write()
110 		if (r != skb->len) {  in fdp_nci_i2c_write()
111 			phy->hard_fault = r;  in fdp_nci_i2c_write()
112 			r = -EREMOTEIO;  in fdp_nci_i2c_write()
134 	struct i2c_client *client = phy->i2c_dev;  in fdp_nci_i2c_read()
141 		len = phy->next_read_size;  in fdp_nci_i2c_read()
145 			dev_dbg(&client->dev, "%s: i2c recv err: %d\n",  in fdp_nci_i2c_read()
160 			dev_dbg(&client->dev, "%s: corrupted packet\n",  in fdp_nci_i2c_read()
162 			phy->next_read_size = 5;  in fdp_nci_i2c_read()
168 			phy->next_read_size = (tmp[2] << 8) + tmp[3] + 3;  in fdp_nci_i2c_read()
170 			phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;  in fdp_nci_i2c_read()
174 				r = -ENOMEM;  in fdp_nci_i2c_read()
179 			fdp_nci_i2c_dump_skb(&client->dev, "fdp_rd", *skb);  in fdp_nci_i2c_read()
190 		r = -EREMOTEIO;  in fdp_nci_i2c_read()
201 	if (!phy || irq != phy->i2c_dev->irq) {  in fdp_nci_i2c_irq_thread_fn()
208 	if (r == -EREMOTEIO || r == -ENOMEM || r == -EBADMSG)  in fdp_nci_i2c_irq_thread_fn()
212 		nci_recv_frame(phy->ndev, skb);  in fdp_nci_i2c_irq_thread_fn()
274 	{ "power-gpios", &power_gpios, 1 },
281 	struct device *dev = &client->dev;  in fdp_nci_i2c_probe()
287 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in fdp_nci_i2c_probe()
289 		return -ENODEV;  in fdp_nci_i2c_probe()
293 	if (client->irq <= 0) {  in fdp_nci_i2c_probe()
295 		return -ENODEV;  in fdp_nci_i2c_probe()
300 		return -ENOMEM;  in fdp_nci_i2c_probe()
302 	phy->i2c_dev = client;  in fdp_nci_i2c_probe()
303 	phy->next_read_size = FDP_NCI_I2C_MIN_PAYLOAD;  in fdp_nci_i2c_probe()
306 	r = devm_request_threaded_irq(dev, client->irq,  in fdp_nci_i2c_probe()
312 		nfc_err(&client->dev, "Unable to register IRQ handler\n");  in fdp_nci_i2c_probe()
321 	phy->power_gpio = devm_gpiod_get(dev, "power", GPIOD_OUT_LOW);  in fdp_nci_i2c_probe()
322 	if (IS_ERR(phy->power_gpio)) {  in fdp_nci_i2c_probe()
324 		return PTR_ERR(phy->power_gpio);  in fdp_nci_i2c_probe()
331 	/* Call the NFC specific probe function */  in fdp_nci_i2c_probe()
332 	r = fdp_nci_probe(phy, &i2c_phy_ops, &phy->ndev,  in fdp_nci_i2c_probe()
347 	fdp_nci_remove(phy->ndev);  in fdp_nci_i2c_remove()
368 MODULE_DESCRIPTION("I2C driver for Intel Fields Peak NFC controller");