1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for NXP PN533 NFC Chip - I2C transport layer
5  * Copyright (C) 2011 Instituto Nokia de Tecnologia
6  * Copyright (C) 2012-2013 Tieto Poland
7  * Copyright (C) 2016 HALE electronic
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()
50 	struct pn533_i2c_phy *phy = dev->phy;  in pn533_i2c_send_frame()  local
51 	struct i2c_client *client = phy->i2c_dev;  in pn533_i2c_send_frame()
54 	if (phy->hard_fault != 0)  in pn533_i2c_send_frame()
55 		return phy->hard_fault;  in pn533_i2c_send_frame()
57 	if (phy->priv == NULL)  in pn533_i2c_send_frame()
58 		phy->priv = dev;  in pn533_i2c_send_frame()
60 	phy->aborted = false;  in pn533_i2c_send_frame()
63 			     out->data, out->len, false);  in pn533_i2c_send_frame()
65 	rc = i2c_master_send(client, out->data, out->len);  in pn533_i2c_send_frame()
67 	if (rc == -EREMOTEIO) { /* Retry, chip was in power down */  in pn533_i2c_send_frame()
69 		rc = i2c_master_send(client, out->data, out->len);  in pn533_i2c_send_frame()
73 		if (rc != out->len)  in pn533_i2c_send_frame()
74 			rc = -EREMOTEIO;  in pn533_i2c_send_frame()
84 	struct pn533_i2c_phy *phy = dev->phy;  in pn533_i2c_abort_cmd()  local
86 	phy->aborted = true;  in pn533_i2c_abort_cmd()
92 	pn533_recv_frame(phy->priv, NULL, -ENOENT);  in pn533_i2c_abort_cmd()
95 static int pn533_i2c_read(struct pn533_i2c_phy *phy, struct sk_buff **skb)  in pn533_i2c_read()  argument
97 	struct i2c_client *client = phy->i2c_dev;  in pn533_i2c_read()
105 		return -ENOMEM;  in pn533_i2c_read()
109 		nfc_err(&client->dev, "cannot read. r=%d len=%d\n", r, len);  in pn533_i2c_read()
111 		return -EREMOTEIO;  in pn533_i2c_read()
114 	if (!((*skb)->data[0] & 0x01)) {  in pn533_i2c_read()
115 		nfc_err(&client->dev, "READY flag not set");  in pn533_i2c_read()
117 		return -EBUSY;  in pn533_i2c_read()
123 	skb_trim(*skb, phy->priv->ops->rx_frame_size((*skb)->data));  in pn533_i2c_read()
130 	struct pn533_i2c_phy *phy = data;  in pn533_i2c_irq_thread_fn()  local
134 	if (!phy || irq != phy->i2c_dev->irq) {  in pn533_i2c_irq_thread_fn()
139 	if (phy->hard_fault != 0)  in pn533_i2c_irq_thread_fn()
142 	r = pn533_i2c_read(phy, &skb);  in pn533_i2c_irq_thread_fn()
143 	if (r == -EREMOTEIO) {  in pn533_i2c_irq_thread_fn()
144 		phy->hard_fault = r;  in pn533_i2c_irq_thread_fn()
146 		pn533_recv_frame(phy->priv, NULL, -EREMOTEIO);  in pn533_i2c_irq_thread_fn()
149 	} else if ((r == -ENOMEM) || (r == -EBADMSG) || (r == -EBUSY)) {  in pn533_i2c_irq_thread_fn()
153 	if (!phy->aborted)  in pn533_i2c_irq_thread_fn()
154 		pn533_recv_frame(phy->priv, skb, 0);  in pn533_i2c_irq_thread_fn()
169 	struct pn533_i2c_phy *phy;  in pn533_i2c_probe()  local
173 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in pn533_i2c_probe()
174 		nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");  in pn533_i2c_probe()
175 		return -ENODEV;  in pn533_i2c_probe()
178 	phy = devm_kzalloc(&client->dev, sizeof(struct pn533_i2c_phy),  in pn533_i2c_probe()
180 	if (!phy)  in pn533_i2c_probe()
181 		return -ENOMEM;  in pn533_i2c_probe()
183 	phy->i2c_dev = client;  in pn533_i2c_probe()
184 	i2c_set_clientdata(client, phy);  in pn533_i2c_probe()
188 				phy, &i2c_phy_ops, NULL,  in pn533_i2c_probe()
189 				&phy->i2c_dev->dev);  in pn533_i2c_probe()
194 	phy->priv = priv;  in pn533_i2c_probe()
195 	r = pn532_i2c_nfc_alloc(priv, PN533_NO_TYPE_B_PROTOCOLS, &client->dev);  in pn533_i2c_probe()
199 	r = request_threaded_irq(client->irq, NULL, pn533_i2c_irq_thread_fn,  in pn533_i2c_probe()
202 				PN533_I2C_DRIVER_NAME, phy);  in pn533_i2c_probe()
204 		nfc_err(&client->dev, "Unable to register IRQ handler\n");  in pn533_i2c_probe()
212 	r = nfc_register_device(priv->nfc_dev);  in pn533_i2c_probe()
219 	free_irq(client->irq, phy);  in pn533_i2c_probe()
222 	nfc_free_device(priv->nfc_dev);  in pn533_i2c_probe()
225 	pn53x_common_clean(phy->priv);  in pn533_i2c_probe()
232 	struct pn533_i2c_phy *phy = i2c_get_clientdata(client);  in pn533_i2c_remove()  local
234 	free_irq(client->irq, phy);  in pn533_i2c_remove()
236 	pn53x_unregister_nfc(phy->priv);  in pn533_i2c_remove()
237 	pn53x_common_clean(phy->priv);  in pn533_i2c_remove()
243 	 * NOTE: The use of the compatibles with the trailing "...-i2c" is
246 	{ .compatible = "nxp,pn533-i2c", },
247 	{ .compatible = "nxp,pn532-i2c", },