Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Driver for NXP PN532 NFC Chip - UART transport layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2018 Lemonage Software GmbH
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Lars Pöschel <poeschel@lemonage.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/nfc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/serdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "pn533.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define PN532_UART_SKB_BUFF_LEN	(PN533_CMD_DATAEXCH_DATA_MAXLEN * 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) enum send_wakeup {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	PN532_SEND_NO_WAKEUP = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	PN532_SEND_WAKEUP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	PN532_SEND_LAST_WAKEUP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) struct pn532_uart_phy {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct serdev_device *serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct sk_buff *recv_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct pn533 *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	 * send_wakeup variable is used to control if we need to send a wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	 * request to the pn532 chip prior to our actual command. There is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	 * little propability of a race condition. We decided to not mutex the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	 * variable as the worst that could happen is, that we send a wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	 * to the chip that is already awake. This does not hurt. It is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	 * no-op to the chip.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	enum send_wakeup send_wakeup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct timer_list cmd_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct sk_buff *cur_out_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int pn532_uart_send_frame(struct pn533 *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 				struct sk_buff *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	/* wakeup sequence and dummy bytes for waiting time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	static const u8 wakeup[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct pn532_uart_phy *pn532 = dev->phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	print_hex_dump_debug("PN532_uart TX: ", DUMP_PREFIX_NONE, 16, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			     out->data, out->len, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	pn532->cur_out_buf = out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (pn532->send_wakeup) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		err = serdev_device_write(pn532->serdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 				wakeup, sizeof(wakeup),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 				MAX_SCHEDULE_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (pn532->send_wakeup == PN532_SEND_LAST_WAKEUP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		pn532->send_wakeup = PN532_SEND_NO_WAKEUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	err = serdev_device_write(pn532->serdev, out->data, out->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 			MAX_SCHEDULE_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	mod_timer(&pn532->cmd_timeout, HZ / 40 + jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static int pn532_uart_send_ack(struct pn533 *dev, gfp_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	/* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	static const u8 ack[PN533_STD_FRAME_ACK_SIZE] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct pn532_uart_phy *pn532 = dev->phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	err = serdev_device_write(pn532->serdev, ack, sizeof(ack),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			MAX_SCHEDULE_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static void pn532_uart_abort_cmd(struct pn533 *dev, gfp_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	/* An ack will cancel the last issued command */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	pn532_uart_send_ack(dev, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	/* schedule cmd_complete_work to finish current command execution */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	pn533_recv_frame(dev, NULL, -ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int pn532_dev_up(struct pn533 *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct pn532_uart_phy *pn532 = dev->phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	ret = serdev_device_open(pn532->serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	pn532->send_wakeup = PN532_SEND_LAST_WAKEUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static int pn532_dev_down(struct pn533 *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	struct pn532_uart_phy *pn532 = dev->phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	serdev_device_close(pn532->serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	pn532->send_wakeup = PN532_SEND_WAKEUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static struct pn533_phy_ops uart_phy_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	.send_frame = pn532_uart_send_frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	.send_ack = pn532_uart_send_ack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	.abort_cmd = pn532_uart_abort_cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	.dev_up = pn532_dev_up,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	.dev_down = pn532_dev_down,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static void pn532_cmd_timeout(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct pn532_uart_phy *dev = from_timer(dev, t, cmd_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	pn532_uart_send_frame(dev->priv, dev->cur_out_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * scans the buffer if it contains a pn532 frame. It is not checked if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * frame is really valid. This is later done with pn533_rx_frame_is_valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * This is useful for malformed or errornous transmitted frames. Adjusts the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  * bufferposition where the frame starts, since pn533_recv_frame expects a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  * well formed frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static int pn532_uart_rx_is_frame(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct pn533_std_frame *std;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	struct pn533_ext_frame *ext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	u16 frame_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	for (i = 0; i + PN533_STD_FRAME_ACK_SIZE <= skb->len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		std = (struct pn533_std_frame *)&skb->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		/* search start code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (std->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		/* frame type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		switch (std->datalen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		case PN533_FRAME_DATALEN_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			if (std->datalen_checksum == 0xff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 				skb_pull(skb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		case PN533_FRAME_DATALEN_ERROR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			if ((std->datalen_checksum == 0xff) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 					(skb->len >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 					 PN533_STD_ERROR_FRAME_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 				skb_pull(skb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		case PN533_FRAME_DATALEN_EXTENDED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			ext = (struct pn533_ext_frame *)&skb->data[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			frame_len = be16_to_cpu(ext->datalen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 			if (skb->len >= frame_len +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 					sizeof(struct pn533_ext_frame) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 					2 /* CKS + Postamble */) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 				skb_pull(skb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		default: /* normal information frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			frame_len = std->datalen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			if (skb->len >= frame_len +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 					sizeof(struct pn533_std_frame) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 					2 /* CKS + Postamble */) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				skb_pull(skb, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 				return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static int pn532_receive_buf(struct serdev_device *serdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		const unsigned char *data, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct pn532_uart_phy *dev = serdev_device_get_drvdata(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	del_timer(&dev->cmd_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		skb_put_u8(dev->recv_skb, *data++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		if (!pn532_uart_rx_is_frame(dev->recv_skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		pn533_recv_frame(dev->priv, dev->recv_skb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		dev->recv_skb = alloc_skb(PN532_UART_SKB_BUFF_LEN, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		if (!dev->recv_skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static struct serdev_device_ops pn532_serdev_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	.receive_buf = pn532_receive_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	.write_wakeup = serdev_device_write_wakeup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static const struct of_device_id pn532_uart_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	{ .compatible = "nxp,pn532", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	{},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) MODULE_DEVICE_TABLE(of, pn532_uart_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static int pn532_uart_probe(struct serdev_device *serdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	struct pn532_uart_phy *pn532;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	struct pn533 *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	pn532 = kzalloc(sizeof(*pn532), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (!pn532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		goto err_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	pn532->recv_skb = alloc_skb(PN532_UART_SKB_BUFF_LEN, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (!pn532->recv_skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	pn532->serdev = serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	serdev_device_set_drvdata(serdev, pn532);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	serdev_device_set_client_ops(serdev, &pn532_serdev_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	err = serdev_device_open(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		dev_err(&serdev->dev, "Unable to open device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		goto err_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	err = serdev_device_set_baudrate(serdev, 115200);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (err != 115200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		goto err_serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	serdev_device_set_flow_control(serdev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	pn532->send_wakeup = PN532_SEND_WAKEUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	timer_setup(&pn532->cmd_timeout, pn532_cmd_timeout, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	priv = pn53x_common_init(PN533_DEVICE_PN532_AUTOPOLL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 				     PN533_PROTO_REQ_ACK_RESP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 				     pn532, &uart_phy_ops, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 				     &pn532->serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (IS_ERR(priv)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		err = PTR_ERR(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		goto err_serdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	pn532->priv = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	err = pn533_finalize_setup(pn532->priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		goto err_clean;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	serdev_device_close(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	err = pn53x_register_nfc(priv, PN533_NO_TYPE_B_PROTOCOLS, &serdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		pn53x_common_clean(pn532->priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		goto err_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) err_clean:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	pn53x_common_clean(pn532->priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) err_serdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	serdev_device_close(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) err_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	kfree_skb(pn532->recv_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) err_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	kfree(pn532);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) err_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static void pn532_uart_remove(struct serdev_device *serdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	struct pn532_uart_phy *pn532 = serdev_device_get_drvdata(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	pn53x_unregister_nfc(pn532->priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	serdev_device_close(serdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	pn53x_common_clean(pn532->priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	kfree_skb(pn532->recv_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	kfree(pn532);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static struct serdev_device_driver pn532_uart_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	.probe = pn532_uart_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	.remove = pn532_uart_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		.name = "pn532_uart",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		.of_match_table = of_match_ptr(pn532_uart_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) module_serdev_device_driver(pn532_uart_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) MODULE_AUTHOR("Lars Pöschel <poeschel@lemonage.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) MODULE_DESCRIPTION("PN532 UART driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) MODULE_LICENSE("GPL");