1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for NXP PN533 NFC Chip - I2C transport layer
6  * Copyright (C) 2012-2013 Tieto Poland
14 #include <linux/i2c.h>
32 				 * < 0 if hardware error occurred (e.g. i2c err)
39 	struct pn533_i2c_phy *phy = dev->phy;  in pn533_i2c_send_ack()  local
40 	struct i2c_client *client = phy->i2c_dev;  in pn533_i2c_send_ack()
53 	struct pn533_i2c_phy *phy = dev->phy;  in pn533_i2c_send_frame()  local
54 	struct i2c_client *client = phy->i2c_dev;  in pn533_i2c_send_frame()
57 	if (phy->hard_fault != 0)  in pn533_i2c_send_frame()
58 		return phy->hard_fault;  in pn533_i2c_send_frame()
60 	if (phy->priv == NULL)  in pn533_i2c_send_frame()
61 		phy->priv = dev;  in pn533_i2c_send_frame()
63 	phy->aborted = false;  in pn533_i2c_send_frame()
66 			     out->data, out->len, false);  in pn533_i2c_send_frame()
68 	rc = i2c_master_send(client, out->data, out->len);  in pn533_i2c_send_frame()
70 	if (rc == -EREMOTEIO) { /* Retry, chip was in power down */  in pn533_i2c_send_frame()
72 		rc = i2c_master_send(client, out->data, out->len);  in pn533_i2c_send_frame()
76 		if (rc != out->len)  in pn533_i2c_send_frame()
77 			rc = -EREMOTEIO;  in pn533_i2c_send_frame()
87 	struct pn533_i2c_phy *phy = dev->phy;  in pn533_i2c_abort_cmd()  local
89 	phy->aborted = true;  in pn533_i2c_abort_cmd()
95 	pn533_recv_frame(phy->priv, NULL, -ENOENT);  in pn533_i2c_abort_cmd()
98 static int pn533_i2c_read(struct pn533_i2c_phy *phy, struct sk_buff **skb)  in pn533_i2c_read()  argument
100 	struct i2c_client *client = phy->i2c_dev;  in pn533_i2c_read()
108 		return -ENOMEM;  in pn533_i2c_read()
112 		nfc_err(&client->dev, "cannot read. r=%d len=%d\n", r, len);  in pn533_i2c_read()
114 		return -EREMOTEIO;  in pn533_i2c_read()
117 	if (!((*skb)->data[0] & 0x01)) {  in pn533_i2c_read()
118 		nfc_err(&client->dev, "READY flag not set");  in pn533_i2c_read()
120 		return -EBUSY;  in pn533_i2c_read()
126 	skb_trim(*skb, phy->priv->ops->rx_frame_size((*skb)->data));  in pn533_i2c_read()
133 	struct pn533_i2c_phy *phy = data;  in pn533_i2c_irq_thread_fn()  local
138 	if (!phy || irq != phy->i2c_dev->irq) {  in pn533_i2c_irq_thread_fn()
143 	client = phy->i2c_dev;  in pn533_i2c_irq_thread_fn()
144 	dev_dbg(&client->dev, "IRQ\n");  in pn533_i2c_irq_thread_fn()
146 	if (phy->hard_fault != 0)  in pn533_i2c_irq_thread_fn()
149 	r = pn533_i2c_read(phy, &skb);  in pn533_i2c_irq_thread_fn()
150 	if (r == -EREMOTEIO) {  in pn533_i2c_irq_thread_fn()
151 		phy->hard_fault = r;  in pn533_i2c_irq_thread_fn()
153 		pn533_recv_frame(phy->priv, NULL, -EREMOTEIO);  in pn533_i2c_irq_thread_fn()
156 	} else if ((r == -ENOMEM) || (r == -EBADMSG) || (r == -EBUSY)) {  in pn533_i2c_irq_thread_fn()
160 	if (!phy->aborted)  in pn533_i2c_irq_thread_fn()
161 		pn533_recv_frame(phy->priv, skb, 0);  in pn533_i2c_irq_thread_fn()
176 	struct pn533_i2c_phy *phy;  in pn533_i2c_probe()  local
180 	dev_dbg(&client->dev, "%s\n", __func__);  in pn533_i2c_probe()
181 	dev_dbg(&client->dev, "IRQ: %d\n", client->irq);  in pn533_i2c_probe()
183 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in pn533_i2c_probe()
184 		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");  in pn533_i2c_probe()
185 		return -ENODEV;  in pn533_i2c_probe()
188 	phy = devm_kzalloc(&client->dev, sizeof(struct pn533_i2c_phy),  in pn533_i2c_probe()
190 	if (!phy)  in pn533_i2c_probe()
191 		return -ENOMEM;  in pn533_i2c_probe()
193 	phy->i2c_dev = client;  in pn533_i2c_probe()
194 	i2c_set_clientdata(client, phy);  in pn533_i2c_probe()
198 				phy, &i2c_phy_ops, NULL,  in pn533_i2c_probe()
199 				&phy->i2c_dev->dev);  in pn533_i2c_probe()
206 	phy->priv = priv;  in pn533_i2c_probe()
207 	r = pn532_i2c_nfc_alloc(priv, PN533_NO_TYPE_B_PROTOCOLS, &client->dev);  in pn533_i2c_probe()
211 	r = request_threaded_irq(client->irq, NULL, pn533_i2c_irq_thread_fn,  in pn533_i2c_probe()
214 				PN533_I2C_DRIVER_NAME, phy);  in pn533_i2c_probe()
216 		nfc_err(&client->dev, "Unable to register IRQ handler\n");  in pn533_i2c_probe()
224 	r = nfc_register_device(priv->nfc_dev);  in pn533_i2c_probe()
231 	free_irq(client->irq, phy);  in pn533_i2c_probe()
234 	nfc_free_device(priv->nfc_dev);  in pn533_i2c_probe()
237 	pn53x_common_clean(phy->priv);  in pn533_i2c_probe()
244 	struct pn533_i2c_phy *phy = i2c_get_clientdata(client);  in pn533_i2c_remove()  local
246 	dev_dbg(&client->dev, "%s\n", __func__);  in pn533_i2c_remove()
248 	free_irq(client->irq, phy);  in pn533_i2c_remove()
250 	pn53x_unregister_nfc(phy->priv);  in pn533_i2c_remove()
251 	pn53x_common_clean(phy->priv);  in pn533_i2c_remove()
259 	 * NOTE: The use of the compatibles with the trailing "...-i2c" is
262 	{ .compatible = "nxp,pn533-i2c", },
263 	{ .compatible = "nxp,pn532-i2c", },
272 MODULE_DEVICE_TABLE(i2c, pn533_i2c_id_table);
287 MODULE_DESCRIPTION("PN533 I2C driver ver " VERSION);