1 // SPDX-License-Identifier: GPL-2.0+
3  * UART Link Layer for S3FWRN82 NCI based Driver
14 #include <linux/nfc.h>
38 	err = serdev_device_write(phy->ser_dev,  in s3fwrn82_uart_write()
39 				  out->data, out->len,  in s3fwrn82_uart_write()
61 		skb_put_u8(phy->recv_skb, *data++);  in s3fwrn82_uart_read()
63 		if (phy->recv_skb->len < S3FWRN82_NCI_HEADER)  in s3fwrn82_uart_read()
66 		if ((phy->recv_skb->len - S3FWRN82_NCI_HEADER)  in s3fwrn82_uart_read()
67 				< phy->recv_skb->data[S3FWRN82_NCI_IDX])  in s3fwrn82_uart_read()
70 		s3fwrn5_recv_frame(phy->common.ndev, phy->recv_skb,  in s3fwrn82_uart_read()
71 				   phy->common.mode);  in s3fwrn82_uart_read()
72 		phy->recv_skb = alloc_skb(NCI_SKB_BUFF_LEN, GFP_KERNEL);  in s3fwrn82_uart_read()
73 		if (!phy->recv_skb)  in s3fwrn82_uart_read()
94 	struct device_node *np = serdev->dev.of_node;  in s3fwrn82_uart_parse_dt()
97 		return -ENODEV;  in s3fwrn82_uart_parse_dt()
99 	phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);  in s3fwrn82_uart_parse_dt()
100 	if (!gpio_is_valid(phy->common.gpio_en))  in s3fwrn82_uart_parse_dt()
101 		return -ENODEV;  in s3fwrn82_uart_parse_dt()
103 	phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);  in s3fwrn82_uart_parse_dt()
104 	if (!gpio_is_valid(phy->common.gpio_fw_wake))  in s3fwrn82_uart_parse_dt()
105 		return -ENODEV;  in s3fwrn82_uart_parse_dt()
113 	int ret = -ENOMEM;  in s3fwrn82_uart_probe()
115 	phy = devm_kzalloc(&serdev->dev, sizeof(*phy), GFP_KERNEL);  in s3fwrn82_uart_probe()
119 	phy->recv_skb = alloc_skb(NCI_SKB_BUFF_LEN, GFP_KERNEL);  in s3fwrn82_uart_probe()
120 	if (!phy->recv_skb)  in s3fwrn82_uart_probe()
123 	mutex_init(&phy->common.mutex);  in s3fwrn82_uart_probe()
124 	phy->common.mode = S3FWRN5_MODE_COLD;  in s3fwrn82_uart_probe()
126 	phy->ser_dev = serdev;  in s3fwrn82_uart_probe()
131 		dev_err(&serdev->dev, "Unable to open device\n");  in s3fwrn82_uart_probe()
137 		ret = -EINVAL;  in s3fwrn82_uart_probe()
147 	ret = devm_gpio_request_one(&phy->ser_dev->dev, phy->common.gpio_en,  in s3fwrn82_uart_probe()
152 	ret = devm_gpio_request_one(&phy->ser_dev->dev,  in s3fwrn82_uart_probe()
153 				    phy->common.gpio_fw_wake,  in s3fwrn82_uart_probe()
158 	ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->ser_dev->dev,  in s3fwrn82_uart_probe()
168 	kfree_skb(phy->recv_skb);  in s3fwrn82_uart_probe()
177 	s3fwrn5_remove(phy->common.ndev);  in s3fwrn82_uart_remove()
179 	kfree_skb(phy->recv_skb);  in s3fwrn82_uart_remove()
194 MODULE_DESCRIPTION("UART driver for Samsung NFC");