forked from luck/tmp_suning_uos_patched
nfc: pn533: add UART phy driver
This adds the UART phy interface for the pn533 driver. The pn533 driver can be used through UART interface this way. It is implemented as a serdev device. Cc: Johan Hovold <johan@kernel.org> Cc: Claudiu Beznea <Claudiu.Beznea@microchip.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Lars Poeschel <poeschel@lemonage.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lars Poeschel
David S. Miller
parent
843cc92ed3
commit
c656aa4c27
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@ -26,3 +26,14 @@ config NFC_PN533_I2C
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If you choose to build a module, it'll be called pn533_i2c.
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Say N if unsure.
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config NFC_PN532_UART
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tristate "NFC PN532 device support (UART)"
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depends on SERIAL_DEV_BUS
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select NFC_PN533
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---help---
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This module adds support for the NXP pn532 UART interface.
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Select this if your platform is using the UART bus.
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If you choose to build a module, it'll be called pn532_uart.
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Say N if unsure.
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@ -4,7 +4,9 @@
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#
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pn533_usb-objs = usb.o
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pn533_i2c-objs = i2c.o
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pn532_uart-objs = uart.o
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obj-$(CONFIG_NFC_PN533) += pn533.o
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obj-$(CONFIG_NFC_PN533_USB) += pn533_usb.o
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obj-$(CONFIG_NFC_PN533_I2C) += pn533_i2c.o
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obj-$(CONFIG_NFC_PN532_UART) += pn532_uart.o
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@ -43,6 +43,11 @@
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/* Preamble (1), SoPC (2), ACK Code (2), Postamble (1) */
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#define PN533_STD_FRAME_ACK_SIZE 6
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/*
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* Preamble (1), SoPC (2), Packet Length (1), Packet Length Checksum (1),
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* Specific Application Level Error Code (1) , Postamble (1)
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*/
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#define PN533_STD_ERROR_FRAME_SIZE 8
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#define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
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#define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
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/* Half start code (3), LEN (4) should be 0xffff for extended frame */
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@ -84,6 +89,9 @@
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#define PN533_CMD_MI_MASK 0x40
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#define PN533_CMD_RET_SUCCESS 0x00
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#define PN533_FRAME_DATALEN_ACK 0x00
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#define PN533_FRAME_DATALEN_ERROR 0x01
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#define PN533_FRAME_DATALEN_EXTENDED 0xFF
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enum pn533_protocol_type {
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PN533_PROTO_REQ_ACK_RESP = 0,
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323
drivers/nfc/pn533/uart.c
Normal file
323
drivers/nfc/pn533/uart.c
Normal file
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@ -0,0 +1,323 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for NXP PN532 NFC Chip - UART transport layer
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*
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* Copyright (C) 2018 Lemonage Software GmbH
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* Author: Lars Pöschel <poeschel@lemonage.de>
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* All rights reserved.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/nfc.h>
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#include <linux/netdevice.h>
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#include <linux/of.h>
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#include <linux/serdev.h>
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#include "pn533.h"
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#define PN532_UART_SKB_BUFF_LEN (PN533_CMD_DATAEXCH_DATA_MAXLEN * 2)
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enum send_wakeup {
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PN532_SEND_NO_WAKEUP = 0,
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PN532_SEND_WAKEUP,
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PN532_SEND_LAST_WAKEUP,
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};
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struct pn532_uart_phy {
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struct serdev_device *serdev;
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struct sk_buff *recv_skb;
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struct pn533 *priv;
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/*
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* send_wakeup variable is used to control if we need to send a wakeup
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* request to the pn532 chip prior to our actual command. There is a
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* little propability of a race condition. We decided to not mutex the
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* variable as the worst that could happen is, that we send a wakeup
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* to the chip that is already awake. This does not hurt. It is a
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* no-op to the chip.
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*/
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enum send_wakeup send_wakeup;
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struct timer_list cmd_timeout;
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struct sk_buff *cur_out_buf;
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};
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static int pn532_uart_send_frame(struct pn533 *dev,
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struct sk_buff *out)
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{
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/* wakeup sequence and dummy bytes for waiting time */
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static const u8 wakeup[] = {
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0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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struct pn532_uart_phy *pn532 = dev->phy;
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int err;
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print_hex_dump_debug("PN532_uart TX: ", DUMP_PREFIX_NONE, 16, 1,
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out->data, out->len, false);
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pn532->cur_out_buf = out;
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if (pn532->send_wakeup) {
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err = serdev_device_write(pn532->serdev,
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wakeup, sizeof(wakeup),
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MAX_SCHEDULE_TIMEOUT);
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if (err < 0)
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return err;
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}
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if (pn532->send_wakeup == PN532_SEND_LAST_WAKEUP)
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pn532->send_wakeup = PN532_SEND_NO_WAKEUP;
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err = serdev_device_write(pn532->serdev, out->data, out->len,
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MAX_SCHEDULE_TIMEOUT);
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if (err < 0)
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return err;
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mod_timer(&pn532->cmd_timeout, HZ / 40 + jiffies);
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return 0;
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}
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static int pn532_uart_send_ack(struct pn533 *dev, gfp_t flags)
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{
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/* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
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static const u8 ack[PN533_STD_FRAME_ACK_SIZE] = {
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0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
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struct pn532_uart_phy *pn532 = dev->phy;
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int err;
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err = serdev_device_write(pn532->serdev, ack, sizeof(ack),
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MAX_SCHEDULE_TIMEOUT);
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if (err < 0)
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return err;
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return 0;
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}
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static void pn532_uart_abort_cmd(struct pn533 *dev, gfp_t flags)
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{
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/* An ack will cancel the last issued command */
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pn532_uart_send_ack(dev, flags);
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/* schedule cmd_complete_work to finish current command execution */
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pn533_recv_frame(dev, NULL, -ENOENT);
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}
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static void pn532_dev_up(struct pn533 *dev)
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{
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struct pn532_uart_phy *pn532 = dev->phy;
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serdev_device_open(pn532->serdev);
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pn532->send_wakeup = PN532_SEND_LAST_WAKEUP;
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}
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static void pn532_dev_down(struct pn533 *dev)
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{
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struct pn532_uart_phy *pn532 = dev->phy;
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serdev_device_close(pn532->serdev);
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pn532->send_wakeup = PN532_SEND_WAKEUP;
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}
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static struct pn533_phy_ops uart_phy_ops = {
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.send_frame = pn532_uart_send_frame,
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.send_ack = pn532_uart_send_ack,
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.abort_cmd = pn532_uart_abort_cmd,
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.dev_up = pn532_dev_up,
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.dev_down = pn532_dev_down,
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};
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static void pn532_cmd_timeout(struct timer_list *t)
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{
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struct pn532_uart_phy *dev = from_timer(dev, t, cmd_timeout);
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pn532_uart_send_frame(dev->priv, dev->cur_out_buf);
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}
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/*
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* scans the buffer if it contains a pn532 frame. It is not checked if the
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* frame is really valid. This is later done with pn533_rx_frame_is_valid.
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* This is useful for malformed or errornous transmitted frames. Adjusts the
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* bufferposition where the frame starts, since pn533_recv_frame expects a
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* well formed frame.
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*/
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static int pn532_uart_rx_is_frame(struct sk_buff *skb)
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{
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struct pn533_std_frame *std;
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struct pn533_ext_frame *ext;
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u16 frame_len;
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int i;
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for (i = 0; i + PN533_STD_FRAME_ACK_SIZE <= skb->len; i++) {
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std = (struct pn533_std_frame *)&skb->data[i];
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/* search start code */
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if (std->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
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continue;
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/* frame type */
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switch (std->datalen) {
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case PN533_FRAME_DATALEN_ACK:
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if (std->datalen_checksum == 0xff) {
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skb_pull(skb, i);
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return 1;
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}
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break;
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case PN533_FRAME_DATALEN_ERROR:
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if ((std->datalen_checksum == 0xff) &&
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(skb->len >=
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PN533_STD_ERROR_FRAME_SIZE)) {
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skb_pull(skb, i);
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return 1;
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}
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break;
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case PN533_FRAME_DATALEN_EXTENDED:
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ext = (struct pn533_ext_frame *)&skb->data[i];
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frame_len = be16_to_cpu(ext->datalen);
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if (skb->len >= frame_len +
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sizeof(struct pn533_ext_frame) +
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2 /* CKS + Postamble */) {
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skb_pull(skb, i);
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return 1;
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}
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break;
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default: /* normal information frame */
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frame_len = std->datalen;
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if (skb->len >= frame_len +
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sizeof(struct pn533_std_frame) +
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2 /* CKS + Postamble */) {
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skb_pull(skb, i);
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return 1;
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}
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break;
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}
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}
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return 0;
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}
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static int pn532_receive_buf(struct serdev_device *serdev,
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const unsigned char *data, size_t count)
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{
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struct pn532_uart_phy *dev = serdev_device_get_drvdata(serdev);
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size_t i;
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del_timer(&dev->cmd_timeout);
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for (i = 0; i < count; i++) {
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skb_put_u8(dev->recv_skb, *data++);
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if (!pn532_uart_rx_is_frame(dev->recv_skb))
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continue;
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pn533_recv_frame(dev->priv, dev->recv_skb, 0);
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dev->recv_skb = alloc_skb(PN532_UART_SKB_BUFF_LEN, GFP_KERNEL);
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if (!dev->recv_skb)
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return 0;
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}
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return i;
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}
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static struct serdev_device_ops pn532_serdev_ops = {
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.receive_buf = pn532_receive_buf,
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.write_wakeup = serdev_device_write_wakeup,
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};
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static const struct of_device_id pn532_uart_of_match[] = {
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{ .compatible = "nxp,pn532", },
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{},
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};
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MODULE_DEVICE_TABLE(of, pn532_uart_of_match);
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static int pn532_uart_probe(struct serdev_device *serdev)
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{
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struct pn532_uart_phy *pn532;
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struct pn533 *priv;
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int err;
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err = -ENOMEM;
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pn532 = kzalloc(sizeof(*pn532), GFP_KERNEL);
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if (!pn532)
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goto err_exit;
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pn532->recv_skb = alloc_skb(PN532_UART_SKB_BUFF_LEN, GFP_KERNEL);
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if (!pn532->recv_skb)
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goto err_free;
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pn532->serdev = serdev;
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serdev_device_set_drvdata(serdev, pn532);
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serdev_device_set_client_ops(serdev, &pn532_serdev_ops);
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err = serdev_device_open(serdev);
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if (err) {
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dev_err(&serdev->dev, "Unable to open device\n");
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goto err_skb;
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}
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err = serdev_device_set_baudrate(serdev, 115200);
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if (err != 115200) {
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err = -EINVAL;
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goto err_serdev;
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}
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serdev_device_set_flow_control(serdev, false);
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pn532->send_wakeup = PN532_SEND_WAKEUP;
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timer_setup(&pn532->cmd_timeout, pn532_cmd_timeout, 0);
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priv = pn53x_common_init(PN533_DEVICE_PN532,
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PN533_PROTO_REQ_ACK_RESP,
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pn532, &uart_phy_ops, NULL,
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&pn532->serdev->dev);
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if (IS_ERR(priv)) {
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err = PTR_ERR(priv);
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goto err_serdev;
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}
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pn532->priv = priv;
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err = pn533_finalize_setup(pn532->priv);
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if (err)
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goto err_clean;
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serdev_device_close(serdev);
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err = pn53x_register_nfc(priv, PN533_NO_TYPE_B_PROTOCOLS, &serdev->dev);
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if (err) {
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pn53x_common_clean(pn532->priv);
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goto err_skb;
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}
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return err;
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err_clean:
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pn53x_common_clean(pn532->priv);
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err_serdev:
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serdev_device_close(serdev);
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err_skb:
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kfree_skb(pn532->recv_skb);
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err_free:
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kfree(pn532);
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err_exit:
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return err;
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}
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static void pn532_uart_remove(struct serdev_device *serdev)
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{
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struct pn532_uart_phy *pn532 = serdev_device_get_drvdata(serdev);
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pn53x_unregister_nfc(pn532->priv);
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serdev_device_close(serdev);
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pn53x_common_clean(pn532->priv);
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kfree_skb(pn532->recv_skb);
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kfree(pn532);
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}
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static struct serdev_device_driver pn532_uart_driver = {
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.probe = pn532_uart_probe,
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.remove = pn532_uart_remove,
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.driver = {
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.name = "pn532_uart",
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.of_match_table = of_match_ptr(pn532_uart_of_match),
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},
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};
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module_serdev_device_driver(pn532_uart_driver);
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MODULE_AUTHOR("Lars Pöschel <poeschel@lemonage.de>");
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MODULE_DESCRIPTION("PN532 UART driver");
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MODULE_LICENSE("GPL");
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