1 // SPDX-License-Identifier: GPL-2.0+
3  * Driver for NXP PN532 NFC Chip - UART transport layer
13 #include <linux/nfc.h>
38 	 * no-op to the chip.
52 	struct pn532_uart_phy *pn532 = dev->phy;  in pn532_uart_send_frame()
56 			     out->data, out->len, false);  in pn532_uart_send_frame()
58 	pn532->cur_out_buf = out;  in pn532_uart_send_frame()
59 	if (pn532->send_wakeup) {  in pn532_uart_send_frame()
60 		err = serdev_device_write(pn532->serdev,  in pn532_uart_send_frame()
67 	if (pn532->send_wakeup == PN532_SEND_LAST_WAKEUP)  in pn532_uart_send_frame()
68 		pn532->send_wakeup = PN532_SEND_NO_WAKEUP;  in pn532_uart_send_frame()
70 	err = serdev_device_write(pn532->serdev, out->data, out->len,  in pn532_uart_send_frame()
75 	mod_timer(&pn532->cmd_timeout, HZ / 40 + jiffies);  in pn532_uart_send_frame()
84 	struct pn532_uart_phy *pn532 = dev->phy;  in pn532_uart_send_ack()
87 	err = serdev_device_write(pn532->serdev, ack, sizeof(ack),  in pn532_uart_send_ack()
100 	pn533_recv_frame(dev, NULL, -ENOENT);  in pn532_uart_abort_cmd()
105 	struct pn532_uart_phy *pn532 = dev->phy;  in pn532_dev_up()
108 	ret = serdev_device_open(pn532->serdev);  in pn532_dev_up()
112 	pn532->send_wakeup = PN532_SEND_LAST_WAKEUP;  in pn532_dev_up()
118 	struct pn532_uart_phy *pn532 = dev->phy;  in pn532_dev_down()
120 	serdev_device_close(pn532->serdev);  in pn532_dev_down()
121 	pn532->send_wakeup = PN532_SEND_WAKEUP;  in pn532_dev_down()
138 	pn532_uart_send_frame(dev->priv, dev->cur_out_buf);  in pn532_cmd_timeout()
155 	for (i = 0; i + PN533_STD_FRAME_ACK_SIZE <= skb->len; i++) {  in pn532_uart_rx_is_frame()
156 		std = (struct pn533_std_frame *)&skb->data[i];  in pn532_uart_rx_is_frame()
158 		if (std->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))  in pn532_uart_rx_is_frame()
162 		switch (std->datalen) {  in pn532_uart_rx_is_frame()
164 			if (std->datalen_checksum == 0xff) {  in pn532_uart_rx_is_frame()
171 			if ((std->datalen_checksum == 0xff) &&  in pn532_uart_rx_is_frame()
172 					(skb->len >=  in pn532_uart_rx_is_frame()
180 			ext = (struct pn533_ext_frame *)&skb->data[i];  in pn532_uart_rx_is_frame()
181 			frame_len = be16_to_cpu(ext->datalen);  in pn532_uart_rx_is_frame()
182 			if (skb->len >= frame_len +  in pn532_uart_rx_is_frame()
191 			frame_len = std->datalen;  in pn532_uart_rx_is_frame()
192 			if (skb->len >= frame_len +  in pn532_uart_rx_is_frame()
212 	del_timer(&dev->cmd_timeout);  in pn532_receive_buf()
214 		skb_put_u8(dev->recv_skb, *data++);  in pn532_receive_buf()
215 		if (!pn532_uart_rx_is_frame(dev->recv_skb))  in pn532_receive_buf()
218 		pn533_recv_frame(dev->priv, dev->recv_skb, 0);  in pn532_receive_buf()
219 		dev->recv_skb = alloc_skb(PN532_UART_SKB_BUFF_LEN, GFP_KERNEL);  in pn532_receive_buf()
220 		if (!dev->recv_skb)  in pn532_receive_buf()
244 	err = -ENOMEM;  in pn532_uart_probe()
249 	pn532->recv_skb = alloc_skb(PN532_UART_SKB_BUFF_LEN, GFP_KERNEL);  in pn532_uart_probe()
250 	if (!pn532->recv_skb)  in pn532_uart_probe()
253 	pn532->serdev = serdev;  in pn532_uart_probe()
258 		dev_err(&serdev->dev, "Unable to open device\n");  in pn532_uart_probe()
264 		err = -EINVAL;  in pn532_uart_probe()
269 	pn532->send_wakeup = PN532_SEND_WAKEUP;  in pn532_uart_probe()
270 	timer_setup(&pn532->cmd_timeout, pn532_cmd_timeout, 0);  in pn532_uart_probe()
274 				     &pn532->serdev->dev);  in pn532_uart_probe()
280 	pn532->priv = priv;  in pn532_uart_probe()
281 	err = pn533_finalize_setup(pn532->priv);  in pn532_uart_probe()
286 	err = pn53x_register_nfc(priv, PN533_NO_TYPE_B_PROTOCOLS, &serdev->dev);  in pn532_uart_probe()
288 		pn53x_common_clean(pn532->priv);  in pn532_uart_probe()
295 	pn53x_common_clean(pn532->priv);  in pn532_uart_probe()
299 	kfree_skb(pn532->recv_skb);  in pn532_uart_probe()
310 	pn53x_unregister_nfc(pn532->priv);  in pn532_uart_remove()
312 	pn53x_common_clean(pn532->priv);  in pn532_uart_remove()
313 	del_timer_sync(&pn532->cmd_timeout);  in pn532_uart_remove()
314 	kfree_skb(pn532->recv_skb);  in pn532_uart_remove()
330 MODULE_DESCRIPTION("PN532 UART driver");