Release of linux driver for STMicroelectronics NFC Transceiver
"ST95HF". This release of driver supports ST95HF in initiator
role to read/write ISO14443 Type A and ISO14443 Type B tags.
Signed-off-by: Shikha Singh <shikha.singh@xxxxxx>
---
drivers/nfc/Kconfig | 1 +
drivers/nfc/Makefile | 1 +
drivers/nfc/st95hf/Kconfig | 11 +
drivers/nfc/st95hf/Makefile | 6 +
drivers/nfc/st95hf/spi.c | 159 ++++++
drivers/nfc/st95hf/spi.h | 45 ++
drivers/nfc/st95hf/st95hf.c | 1134 +++++++++++++++++++++++++++++++++++++++++++
7 files changed, 1357 insertions(+)
create mode 100644 drivers/nfc/st95hf/Kconfig
create mode 100644 drivers/nfc/st95hf/Makefile
create mode 100644 drivers/nfc/st95hf/spi.c
create mode 100644 drivers/nfc/st95hf/spi.h
create mode 100644 drivers/nfc/st95hf/st95hf.c
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index 107714e..48e685b 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -74,4 +74,5 @@ source "drivers/nfc/nfcmrvl/Kconfig"
source "drivers/nfc/st21nfca/Kconfig"
source "drivers/nfc/st21nfcb/Kconfig"
source "drivers/nfc/nxp-nci/Kconfig"
+source "drivers/nfc/st95hf/Kconfig"
endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index a4292d79..1505c95 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -14,5 +14,6 @@ obj-$(CONFIG_NFC_TRF7970A) += trf7970a.o
obj-$(CONFIG_NFC_ST21NFCA) += st21nfca/
obj-$(CONFIG_NFC_ST21NFCB) += st21nfcb/
obj-$(CONFIG_NFC_NXP_NCI) += nxp-nci/
+obj-$(CONFIG_NFC_ST95HF) += st95hf/
ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
diff --git a/drivers/nfc/st95hf/Kconfig b/drivers/nfc/st95hf/Kconfig
new file mode 100644
index 0000000..745a2ce
--- /dev/null
+++ b/drivers/nfc/st95hf/Kconfig
@@ -0,0 +1,11 @@
+
+config NFC_ST95HF
+ tristate "ST95HF NFC Transceiver driver"
+ depends on SPI
+ help
+ This enables the ST NFC driver for ST95HF NFC transceiver.
+ This makes use of SPI framework to communicate with transceiver
+ and registered with NFC digital core to support Linux NFC framework.
+
+ Say Y here to compile support for ST NFC transceiver linux driver
+ into the kernel or say M to compile it as module.
diff --git a/drivers/nfc/st95hf/Makefile b/drivers/nfc/st95hf/Makefile
new file mode 100644
index 0000000..2d8f8f3
--- /dev/null
+++ b/drivers/nfc/st95hf/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for STMicroelectronics NFC transceiver ST95HF
+# #
+
+obj-$(CONFIG_NFC_ST95HF) += st_transceiver.o
+st_transceiver-objs := spi.o st95hf.o
diff --git a/drivers/nfc/st95hf/spi.c b/drivers/nfc/st95hf/spi.c
new file mode 100644
index 0000000..8e205e6
--- /dev/null
+++ b/drivers/nfc/st95hf/spi.c
@@ -0,0 +1,159 @@
+ /*
+ * ----------------------------------------------------------------------------
+ * drivers/nfc/st95hf/spi.c function definitions for SPI communication
+ * ----------------------------------------------------------------------------
+ *
+ * Copyright (C) 2015 STMicroelectronics – All Rights Reserved
+ * Author: Shikha Singh <shikha.singh@xxxxxx>
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License Version 2.0 only. See linux/COPYING for more information.
+ * ---------------------------------------------------------------------------
+ */
+
+#include <linux/of_gpio.h>
+#include "spi.h"
+
+/* Function to send user provided buffer to ST95HF through SPI */
+int spi_send_to_st95hf(struct spi_context *spicontext,
+ unsigned char *buffertx, int datalen,
+ enum req_type reqtype)
+{
+ struct spi_message m;
+ int result = 0;
+ struct spi_device *spidev = spicontext->spidev;
+ struct spi_transfer tx_transfer = {
+ .rx_buf = NULL,
+ .tx_buf = buffertx,
+ .len = datalen,
+ .cs_change = 0,
+ .bits_per_word = 0,
+ .delay_usecs = 0,
+ .speed_hz = 0,
+ };
+
+ spicontext->reply_from_st95 = 0;
+
+ if (reqtype == SYNC)
+ spicontext->req_issync = true;
+ else
+ spicontext->req_issync = false;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&tx_transfer, &m);
+
+ result = spi_sync(spidev, &m);
+ if (result) {
+ dev_err(&spidev->dev,
+ "error: sending cmd to st95hf using SPI\n");
+ return result;
+ }
+
+ if (reqtype == ASYNC) { /* return for asynchronous or no-wait case */
+ return 0;
+ }
+
+ do {
+ result = wait_event_interruptible_timeout(
+ spicontext->st95wait_queue,
+ spicontext->reply_from_st95 == 1,
+ 1000);
+ } while (result < 0);
+
+ if (result == 0) {
+ dev_err(&spidev->dev, "error: response not ready timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ if (result > 0)
+ result = 0;
+
+ return result;
+}
+EXPORT_SYMBOL_GPL(spi_send_to_st95hf);
+
+/* Function to Receive command Response */
+int spi_receive_response(struct spi_context *spicontext,
+ unsigned char *receivebuff,
+ int *len)
+{
+ struct spi_transfer tx_takeresponse1;
+ struct spi_transfer tx_takeresponse2;
+ struct spi_transfer tx_takedata;
+ struct spi_message m;
+ unsigned char readdata_cmd = ST95HF_COMMAND_RECEIVE;
+ int ret = 0;
+
+ struct spi_device *spidev = spicontext->spidev;
+
+ *len = 0;
+
+ memset(&tx_takeresponse1, 0x0, sizeof(struct spi_transfer));
+ memset(&tx_takeresponse2, 0x0, sizeof(struct spi_transfer));
+ memset(&tx_takedata, 0x0, sizeof(struct spi_transfer));
+
+ tx_takeresponse1.tx_buf = &readdata_cmd;
+ tx_takeresponse1.len = 1;
+
+ tx_takeresponse2.rx_buf = receivebuff;
+ /* 1 byte Response code + 1 byte length of data */
+ tx_takeresponse2.len = 2;
+ /* Dont allow to make chipselect high */
+ tx_takeresponse2.cs_change = 1;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&tx_takeresponse1, &m);
+ spi_message_add_tail(&tx_takeresponse2, &m);
+
+ ret = spi_sync(spidev, &m);
+ if (ret)
+ return ret;
+
+ /* 2 bytes are already read */
+ *len = 2;
+
+ /*support of long frame*/
+ if (receivebuff[0] & 0x60)
+ *len += (((receivebuff[0] & 0x60) >> 5) << 8) | receivebuff[1];
+ else
+ *len += receivebuff[1];
+
+ /* Now make a transfer to take only relevant data */
+ tx_takedata.rx_buf = &receivebuff[2];
+ tx_takedata.len = (*len) - 2;
+ tx_takedata.cs_change = 0;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&tx_takedata, &m);
+
+ return spi_sync(spidev, &m);
+}
+EXPORT_SYMBOL_GPL(spi_receive_response);
+
+int spi_receive_echo_response(struct spi_context *spicontext,
+ unsigned char *receivebuff)
+{
+ struct spi_transfer tx_takeresponse1;
+ struct spi_transfer tx_takedata;
+ struct spi_message m;
+ unsigned char readdata_cmd = ST95HF_COMMAND_RECEIVE;
+ struct spi_device *spidev = spicontext->spidev;
+
+ memset(&tx_takeresponse1, 0x0, sizeof(struct spi_transfer));
+ memset(&tx_takedata, 0x0, sizeof(struct spi_transfer));
+
+ tx_takeresponse1.tx_buf = &readdata_cmd;
+ tx_takeresponse1.len = 1;
+ tx_takeresponse1.rx_buf = NULL;
+
+ tx_takedata.rx_buf = receivebuff;
+ tx_takedata.tx_buf = NULL;
+ tx_takedata.len = 1;
+
+ spi_message_init(&m);
+ spi_message_add_tail(&tx_takeresponse1, &m);
+ spi_message_add_tail(&tx_takedata, &m);
+
+ return spi_sync(spidev, &m);
+}
+EXPORT_SYMBOL_GPL(spi_receive_echo_response);
diff --git a/drivers/nfc/st95hf/spi.h b/drivers/nfc/st95hf/spi.h
new file mode 100644
index 0000000..aa3eea0d
--- /dev/null
+++ b/drivers/nfc/st95hf/spi.h
@@ -0,0 +1,45 @@
+ /*
+ * -----------------------------------------------------------------------------
+ * drivers/nfc/st95hf/spi.h functions declarations for SPI communication
+ * -----------------------------------------------------------------------------
+ *
+ * Copyright (C) 2015 STMicroelectronics – All Rights Reserved
+ * Author: Shikha Singh <shikha.singh@xxxxxx>
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License Version 2.0 only. See linux/COPYING for more information.
+ * ---------------------------------------------------------------------------
+ */
+
+#ifndef __LINUX_ST95HF_SPI_H
+#define __LINUX_ST95HF_SPI_H
+
+#include <linux/spi/spi.h>
+
+struct spi_context {
+ int reply_from_st95;
+ wait_queue_head_t st95wait_queue;
+ bool req_issync;
+ struct spi_device *spidev;
+};
+
+/* Flags to differentiate synchronous & asynchronous request */
+enum req_type {
+ SYNC,
+ ASYNC,
+};
+
+#define ST95HF_COMMAND_RECEIVE 0x02
+
+int spi_send_to_st95hf(struct spi_context *spicontext,
+ unsigned char *buffertx, int datalen,
+ enum req_type reqtype);
+
+int spi_receive_response(struct spi_context *spicontext,
+ unsigned char *receivebuff,
+ int *len);
+
+int spi_receive_echo_response(struct spi_context *spicontext,
+ unsigned char *receivebuff);
+
+#endif
diff --git a/drivers/nfc/st95hf/st95hf.c b/drivers/nfc/st95hf/st95hf.c
new file mode 100644
index 0000000..1fa3cd5
--- /dev/null
+++ b/drivers/nfc/st95hf/st95hf.c
@@ -0,0 +1,1134 @@
+/*
+ * ----------------------------------------------------------------------------
+ * Driver for STNFC Transceiver (Role: 14443_A/B Tag Reader/Writer)
+ * ----------------------------------------------------------------------------
+ *
+ * Copyright (C) 2015 STMicroelectronics All Rights Reserved
+ * Author: Shikha Singh <shikha.singh@xxxxxx>
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License Version 2.0 only. See linux/COPYING for more information.
+ * ---------------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/err.h>
+#include <linux/nfc.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/netdevice.h>
+#include <linux/wait.h>
+#include <net/nfc/digital.h>
+#include <net/nfc/nfc.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include "spi.h"
+
+#define VERSION "0.1"
+
+/* Command Send Interface */
+/* Basic ST95HF SPI CMD Ids */
+#define ST95HF_COMMAND_SEND 0x0
+#define ST95HF_COMMAND_RESET 0x1
+
+/* ST95HF_COMMAND_SEND CMD Ids */
+#define ECHO_CMD 0x55
+#define WRITE_REGISTER_CMD 0x9
+#define PROTOCOL_SELECT_CMD 0x2
+#define SEND_RECEIVE_CMD 0x4
+
+/* High level cmd interface */
+#define MAX_CMD_PARAMS 4
+#define ISO14443A_PROTOCOL_CODE 0x2
+#define ISO14443B_PROTOCOL_CODE 0x3
+
+enum st95hf_cmd_list {
+ ECHO,
+ ISO14443A_CONFIG,
+ ISO14443A_DEMOGAIN,
+ ISO14443B_DEMOGAIN,
+ ISO14443A_PROTOCOL_SELECT,
+ ISO14443B_PROTOCOL_SELECT,
+ RESET,
+ WTX_RESPONSE,
+ FIELD_OFF,
+};
+
+struct cmd {
+ int cmd_len;
+ unsigned char cmd_id;
+ unsigned char no_cmd_params;
+ unsigned char cmd_params[MAX_CMD_PARAMS];
+ enum req_type req;
+};
+
+struct param_list {
+ int param_offset;
+ int new_param_val;
+};
+
+static const struct cmd cmd_array[] = {
+ {
+ .cmd_len = 0x2,
+ .cmd_id = ECHO_CMD,
+ .no_cmd_params = 0,
+ .req = SYNC,
+ },
+ {
+ .cmd_len = 0x7,
+ .cmd_id = WRITE_REGISTER_CMD,
+ .no_cmd_params = 0x4,
+ .cmd_params = {0x3A, 0x00, 0x5A, 0x04},
+ .req = SYNC,
+ },
+ {
+ .cmd_len = 0x7,
+ .cmd_id = WRITE_REGISTER_CMD,
+ .no_cmd_params = 0x4,
+ .cmd_params = {0x68, 0x01, 0x01, 0xDF},
+ .req = SYNC,
+ },
+ {
+ .cmd_len = 0x7,
+ .cmd_id = WRITE_REGISTER_CMD,
+ .no_cmd_params = 0x4,
+ .cmd_params = {0x68, 0x01, 0x01, 0x51},
+ .req = SYNC,
+ },
+ {
+ .cmd_len = 0x7,
+ .cmd_id = PROTOCOL_SELECT_CMD,
+ .no_cmd_params = 0x4,
+ .cmd_params = {ISO14443A_PROTOCOL_CODE, 0x00, 0x01, 0xA0},
+ .req = SYNC,
+ },
+ {
+ .cmd_len = 0x7,
+ .cmd_id = PROTOCOL_SELECT_CMD,
+ .no_cmd_params = 0x4,
+ .cmd_params = {ISO14443B_PROTOCOL_CODE, 0x01, 0x03, 0xFF},
+ .req = SYNC,
+ },
+ {
+ .cmd_len = 0x1,
+ .cmd_id = ST95HF_COMMAND_RESET,
+ .no_cmd_params = 0x0,
+ .req = ASYNC,
+ },
+ {
+ .cmd_len = 0x6,
+ .cmd_id = SEND_RECEIVE_CMD,
+ .no_cmd_params = 0x3,
+ .cmd_params = {0xF2, 0x00, 0x28},
+ .req = ASYNC,
+ },
+ {
+ .cmd_len = 0x5,
+ .cmd_id = PROTOCOL_SELECT_CMD,
+ .no_cmd_params = 0x2,
+ .cmd_params = {0x0, 0x0},
+ .req = SYNC,
+ },
+};
+
+#define MAX_CMD_LEN 0x7
+
+/*
+ * head room len is 3
+ * 1 byte for control byte
+ * 1 byte for cmd
+ * 1 byte for size
+ */
+#define ST95HF_HEADROOM_LEN 3
+
+/*
+ * tailroom is 1 for ISO14443A
+ * and 0 for ISO14443B, hence the
+ * max value 1 should be taken
+ */
+#define ST95HF_TAILROOM_LEN 1
+
+/* Command Response interface */
+#define SELECT_PROTOCOL_RES_LEN 2
+#define MAX_RESPONSE_BUFFER_SIZE 280
+#define ECHORESPONSE 0x55
+#define WTX_REQ_FROM_TAG 0xF2
+
+/* ST95HF Driver defs */
+/* supported protocols */
+#define ST95HF_SUPPORTED_PROT (NFC_PROTO_ISO14443_MASK | \
+ NFC_PROTO_ISO14443_B_MASK)
+
+/* driver capabilities */
+#define ST95HF_CAPABILITIES NFC_DIGITAL_DRV_CAPS_IN_CRC
+
+/* Misc defs */
+#define HIGH 1
+#define LOW 0
+#define ISO14443A_RATS_REQ 0xE0
+
+struct st95_digital_cmd_complete_arg {
+ struct sk_buff *skb_resp;
+ nfc_digital_cmd_complete_t complete_cb;
+ void *cb_usrarg;
+ bool rats;
+};
+
+/* Below structure contains driver specific data */
+struct st95hf_context {
+ struct spi_context spicontext;
+ struct nfc_digital_dev *ddev;
+ struct nfc_dev *nfcdev;
+ unsigned int st95hf_enable_gpio;
+ struct st95_digital_cmd_complete_arg *complete_cb_arg;
+ struct regulator *st95hf_supply;
+ unsigned char sendrcv_lastbyte;
+ u8 current_protocol;
+ u8 current_rf_tech;
+ int fwi;
+};
+
+/* Below helper functions to send command to ST95HF */
+static int st95hf_send_cmd(struct st95hf_context *stcontext,
+ enum st95hf_cmd_list cmd,
+ int no_modif,
+ struct param_list *list_array)
+{
+ unsigned char spi_cmd_buffer[MAX_CMD_LEN];
+ int i;
+
+ if (cmd_array[cmd].cmd_len > MAX_CMD_LEN)
+ return -EINVAL;
+ if (cmd_array[cmd].no_cmd_params < no_modif)
+ return -EINVAL;
+ if (no_modif && !list_array)
+ return -EINVAL;
+
+ spi_cmd_buffer[0] = ST95HF_COMMAND_SEND;
+ spi_cmd_buffer[1] = cmd_array[cmd].cmd_id;
+ spi_cmd_buffer[2] = cmd_array[cmd].no_cmd_params;
+
+ memcpy(&spi_cmd_buffer[3], cmd_array[cmd].cmd_params,
+ spi_cmd_buffer[2]);
+
+ for (i = 0; i < no_modif; i++) {
+ if (list_array[i].param_offset >= cmd_array[cmd].no_cmd_params)
+ return -EINVAL;
+ spi_cmd_buffer[3 + list_array[i].param_offset] =
+ list_array[i].new_param_val;
+ }
+
+ return spi_send_to_st95hf(&stcontext->spicontext,
+ spi_cmd_buffer,
+ cmd_array[cmd].cmd_len,
+ cmd_array[cmd].req);
+}
+
+/*
+ * Below helper function to receive response from ST95HF when
+ * length of response is 2 bytes and 1st byte == 0x0 indicate success
+ */
+static int spi_receive_generic(struct st95hf_context *st95context)
+{
+ int result;
+ unsigned char st95hf_response_arr[2];
+ int response_length;
+ struct device *dev = &st95context->spicontext.spidev->dev;
+
+ result = spi_receive_response(&st95context->spicontext,
+ st95hf_response_arr,
+ &response_length);
+
+ if (result) {
+ dev_err(dev, "spi error spi_receive_generic(), err = 0x%x\n",
+ result);
+ return result;
+ }
+
+ if (st95hf_response_arr[0]) {
+ dev_err(dev, "st95hf error spi_receive_generic(), err = 0x%x\n",
+ st95hf_response_arr[0]);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int st95hf_echo_command(struct st95hf_context *st95context)
+{
+ int result = 0;
+ unsigned char echo_response;
+
+ result = st95hf_send_cmd(st95context, ECHO, 0, NULL);
+ if (result)
+ return result;
+
+ /* If control reached here, response can be taken */
+ result = spi_receive_echo_response(&st95context->spicontext,
+ &echo_response);
+ if (result) {
+ dev_err(&st95context->spicontext.spidev->dev, "err: echo response receieve error\n");
+ return result;
+ }
+
+ if (echo_response == ECHORESPONSE)
+ return 0;
+
+ return -EIO;
+}
+
+static int st95hf_select_protocol(struct st95hf_context *stcontext, int type)
+{
+ int result = 0;
+ struct device *dev;
+
+ dev = &stcontext->nfcdev->dev;
+
+ switch (type) {
+ case NFC_DIGITAL_RF_TECH_106A:
+ stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_106A;
+ result = st95hf_send_cmd(stcontext,
+ ISO14443A_PROTOCOL_SELECT,
+ 0,
+ NULL);
+ if (result) {
+ dev_err(dev, "protocol sel send, err = 0x%x\n",
+ result);
+ return result;
+ }
+ break;
+ case NFC_DIGITAL_RF_TECH_106B:
+ stcontext->current_rf_tech = NFC_DIGITAL_RF_TECH_106B;
+ result = st95hf_send_cmd(stcontext,
+ ISO14443B_PROTOCOL_SELECT,
+ 0,
+ NULL);
+ if (result) {
+ dev_err(dev, "protocol sel send, err = 0x%x\n",
+ result);
+ return result;
+ }
+ break;
+ default:
+ /* This release supports only 14443 TypeA and TypeB */
+ return -EINVAL;
+ }
+
+ result = spi_receive_generic(stcontext);
+ if (result) {
+ dev_err(dev, "protocol sel response, err = 0x%x\n", result);
+ return result;
+ }
+ /* Check if 14443A/B then do some additional settings */
+ if (type == NFC_DIGITAL_RF_TECH_106A) {
+ /* 14443A config setting */
+ result = st95hf_send_cmd(stcontext, ISO14443A_CONFIG, 0, NULL);
+ if (result) {
+ dev_err(dev, "config cmd send, err = 0x%x\n", result);
+ return result;
+ }
+
+ result = spi_receive_generic(stcontext);
+ if (result) {
+ dev_err(dev, "config cmd response, err = 0x%x\n",
+ result);
+ return result;
+ }
+
+ /* Demo gain setting for type 4a */
+ result = st95hf_send_cmd(stcontext,
+ ISO14443A_DEMOGAIN,
+ 0,
+ NULL);
+ if (result) {
+ dev_err(dev, "demogain cmd send, err = 0x%x\n", result);
+ return result;
+ }
+
+ result = spi_receive_generic(stcontext);
+ if (result) {
+ dev_err(dev, "demogain cmd response, err = 0x%x\n",
+ result);
+ return result;
+ }
+ }
+
+ if (type == NFC_DIGITAL_RF_TECH_106B) {
+ /*
+ * some delay is required after select protocol
+ * command in case of ISO14443 Type B
+ */
+ usleep_range(50000, 60000);
+
+ result = st95hf_send_cmd(stcontext,
+ ISO14443B_DEMOGAIN,
+ 0,
+ NULL);
+ if (result) {
+ dev_err(dev, "type b demogain cmd send, err = 0x%x\n",
+ result);
+ return result;
+ }
+
+ result = spi_receive_generic(stcontext);
+ if (result) {
+ dev_err(dev, "type b demogain cmd response, err = 0x%x\n",
+ result);
+ return result;
+ }
+ }
+
+ return 0;
+}
+
+static void st95hf_send_st95enable_negativepulse(struct st95hf_context *st95con)
+{
+ /* First make irq_in pin high */
+ gpio_set_value(st95con->st95hf_enable_gpio, HIGH);
+
+ /* wait for 1 milisecond */
+ usleep_range(1000, 2000);
+
+ /* Make irq_in pin low */
+ gpio_set_value(st95con->st95hf_enable_gpio, LOW);
+
+ /* wait for minimum interrupt pulse to make st95 active */
+ usleep_range(1000, 2000); /* wait for 1 milisecond */
+
+ /* At end make it high */
+ gpio_set_value(st95con->st95hf_enable_gpio, HIGH);
+}
+
+/*
+ * Send a reset sequence over SPI bus (Reset command + wait 3ms +
+ * negative pulse on st95hf enable gpio
+ */
+static int st95hf_send_spi_reset_sequence(struct st95hf_context *st95context)
+{
+ int result = 0;
+
+ result = st95hf_send_cmd(st95context, RESET, 0, NULL);
+ if (result) {
+ dev_err(&st95context->spicontext.spidev->dev,
+ "spi reset sequence cmd error = %d", result);
+ return result;
+ }
+
+ /* wait for 3 milisecond to complete the controller reset process */
+ usleep_range(3000, 4000);
+
+ /* send negative pulse to make st95hf active */
+ st95hf_send_st95enable_negativepulse(st95context);
+
+ /* wait for 10 milisecond : HFO setup time */
+ usleep_range(10000, 20000);
+
+ return result;
+}
+
+static int st95hf_por_sequence(struct st95hf_context *st95context)
+{
+ int nth_attempt = 1;
+ int result;
+
+ st95hf_send_st95enable_negativepulse(st95context);
+
+ usleep_range(5000, 6000);
+ do {
+ /* send an ECHO command and checks ST95HF response */
+ result = st95hf_echo_command(st95context);
+
+ dev_dbg(&st95context->spicontext.spidev->dev,
+ "response from echo function = 0x%x, attempt = %d\n",
+ result, nth_attempt);
+
+ if (!result)
+ return 0;
+
+ /* send an pulse on IRQ in case of the chip is on sleep state */
+ if (nth_attempt == 2)
+ st95hf_send_st95enable_negativepulse(st95context);
+ else
+ st95hf_send_spi_reset_sequence(st95context);
+
+ /* delay of 50 milisecond */
+ usleep_range(50000, 51000);
+ } while (nth_attempt++ < 3);
+
+ return -ETIMEDOUT;
+}
+
+static int iso14443_config_fdt(struct st95hf_context *st95context, int wtxm)
+{
+ int result = 0;
+ struct device *dev = &st95context->spicontext.spidev->dev;
+ struct nfc_digital_dev *nfcddev = st95context->ddev;
+ unsigned char pp_typeb;
+ struct param_list new_params[2];
+
+ pp_typeb = cmd_array[ISO14443B_PROTOCOL_SELECT].cmd_params[2];
+
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443) {
+ if (st95context->fwi < 4)
+ st95context->fwi = 4;
+ }
+
+ new_params[0].param_offset = 2;
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443)
+ new_params[0].new_param_val = st95context->fwi;
+ else if (nfcddev->curr_protocol == NFC_PROTO_ISO14443_B)
+ new_params[0].new_param_val = pp_typeb;
+
+ new_params[1].param_offset = 3;
+ new_params[1].new_param_val = wtxm;
+
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443)
+ result = st95hf_send_cmd(st95context,
+ ISO14443A_PROTOCOL_SELECT,
+ 2,
+ new_params);
+ else if (nfcddev->curr_protocol == NFC_PROTO_ISO14443_B)
+ result = st95hf_send_cmd(st95context,
+ ISO14443B_PROTOCOL_SELECT,
+ 2,
+ new_params);
+ if (result) {
+ dev_err(dev, "WTX select protocol cmd send, err = 0x%x\n",
+ result);
+ return result;
+ }
+
+ result = spi_receive_generic(st95context);
+ if (result) {
+ dev_err(dev, "WTX select protocol response, err = 0x%x\n",
+ result);
+ return result;
+ }
+
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443) {
+ result = st95hf_send_cmd(st95context,
+ ISO14443A_CONFIG,
+ 0,
+ NULL);
+ if (result) {
+ dev_err(dev, "WTX config cmd send, err = 0x%x\n",
+ result);
+ return result;
+ }
+ result = spi_receive_generic(st95context);
+ if (result) {
+ dev_err(dev, "WTX config cmd response, err = 0x%x\n",
+ result);
+ return result;
+ }
+ }
+
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443)
+ result = st95hf_send_cmd(st95context,
+ ISO14443A_DEMOGAIN,
+ 0,
+ NULL);
+ else if (nfcddev->curr_protocol == NFC_PROTO_ISO14443_B)
+ result = st95hf_send_cmd(st95context,
+ ISO14443B_DEMOGAIN,
+ 0,
+ NULL);
+ if (result) {
+ dev_err(dev, "WTX demogain cmd send, err = 0x%x\n", result);
+ return result;
+ }
+
+ result = spi_receive_generic(st95context);
+ if (result) {
+ dev_err(dev, "WTX demogain cmd response, err = 0x%x\n", result);
+ return result;
+ }
+
+ return 0;
+}
+
+static irqreturn_t irq_handler(int irq, void *st95hfcontext)
+{
+ struct st95hf_context *stcontext =
+ (struct st95hf_context *)st95hfcontext;
+
+ if (stcontext->spicontext.req_issync) {
+ stcontext->spicontext.reply_from_st95 = 1;
+ wake_up_interruptible(&stcontext->spicontext.st95wait_queue);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t irq_thread_handler(int irq, void *st95hfcontext)
+{
+ int result;
+ int res_len;
+ int skb_len;
+ static bool wtx;
+ struct param_list new_params[1];
+ struct st95hf_context *stcontext =
+ (struct st95hf_context *)st95hfcontext;
+ unsigned char error_byte;
+ struct device *dev = &stcontext->nfcdev->dev;
+ struct nfc_digital_dev *nfcddev = stcontext->ddev;
+ unsigned char val_mm;
+
+ struct st95_digital_cmd_complete_arg *cb_arg =
+ stcontext->complete_cb_arg;
+
+ if (!cb_arg) {
+ dev_err(dev, "cb_arg is NULL in threaded ISR\n");
+ BUG();
+ }
+
+ result = spi_receive_response(&stcontext->spicontext,
+ cb_arg->skb_resp->data,
+ &res_len);
+ if (result) {
+ dev_err(dev, "res receive threaded ISR err = 0x%x\n", result);
+ goto end;
+ }
+
+ if (*((cb_arg->skb_resp->data) + 2) == WTX_REQ_FROM_TAG) {
+ /* Request for new FWT from tag */
+ result = iso14443_config_fdt(stcontext,
+ (*((cb_arg->skb_resp->data) + 3)
+ & 0x3f));
+ if (result) {
+ dev_err(dev, "Config. setting error on WTX req, err = 0x%x\n",
+ result);
+ goto end;
+ }
+ wtx = true;
+
+ /* ASYNC req as no response expected */
+ new_params[0].param_offset = 1;
+ new_params[0].new_param_val =
+ *((cb_arg->skb_resp->data) + 3);
+
+ result = st95hf_send_cmd(stcontext,
+ WTX_RESPONSE,
+ 1,
+ new_params);
+ if (result) {
+ dev_err(dev, "WTX response send, err = 0x%x\n", result);
+ goto end;
+ }
+ return IRQ_HANDLED;
+ }
+
+ /* First check ST95HF specific error */
+ if ((*cb_arg->skb_resp->data) & 0xf) {
+ dev_err(dev, "st95hf, err code = 0x%x, len of data received = %d\n",
+ *cb_arg->skb_resp->data,
+ *(cb_arg->skb_resp->data + 1));
+
+ result = -EIO;
+ goto end;
+ }
+
+ /* Check for CRC err only if CRC is present in the tag response */
+ switch (stcontext->current_rf_tech) {
+ case NFC_DIGITAL_RF_TECH_106A:
+ if (stcontext->sendrcv_lastbyte == 0x28) {
+ error_byte = *(cb_arg->skb_resp->data + res_len - 3);
+ if (error_byte & 0x20) {
+ /* CRC error occurred */
+ dev_err(dev, "CRC byte rec frame = 0x%x\n",
+ error_byte);
+ result = -EIO;
+ goto end;
+ }
+ }
+ break;
+ case NFC_DIGITAL_RF_TECH_106B:
+ error_byte = *(cb_arg->skb_resp->data + res_len - 1);
+ if (error_byte & 0x01) {
+ /* CRC error occurred */
+ dev_err(dev, "CRC byte rec frame = 0x%x\n", error_byte);
+ result = -EIO;
+ goto end;
+ }
+ break;
+ }
+
+ /* Process the response */
+ skb_put(cb_arg->skb_resp, res_len);
+ /* Remove st95 header */
+ skb_pull(cb_arg->skb_resp, 2);
+
+ skb_len = cb_arg->skb_resp->len;
+
+ /* check if it is case of RATS request reply & FWI is present */
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443 && cb_arg->rats) {
+ /* if FWI is present, check format byte */
+ if ((*(cb_arg->skb_resp->data + 1) & 0x20) == 0x20) {
+ if ((*(cb_arg->skb_resp->data + 1) & 0x10) == 0x10)
+ stcontext->fwi =
+ (*(cb_arg->skb_resp->data + 3) & 0xF0)
+ >> 4;
+ else
+ stcontext->fwi =
+ (*(cb_arg->skb_resp->data + 2) & 0xF0)
+ >> 4;
+ }
+
+ val_mm = cmd_array[ISO14443A_PROTOCOL_SELECT].cmd_params[3];
+
+ result = iso14443_config_fdt(stcontext, val_mm);
+ if (result) {
+ dev_err(dev, "error in config_fdt to handle fwi of ATS, error=%d\n",
+ result);
+ goto end;
+ }
+ }
+
+ /* Remove CRC bytes only if received frames data has an eod (CRC) */
+ switch (stcontext->current_rf_tech) {
+ case NFC_DIGITAL_RF_TECH_106A:
+ if (stcontext->sendrcv_lastbyte == 0x28)
+ skb_trim(cb_arg->skb_resp, (skb_len - 5));
+ else
+ skb_trim(cb_arg->skb_resp, (skb_len - 3));
+ break;
+ case NFC_DIGITAL_RF_TECH_106B:
+ skb_trim(cb_arg->skb_resp, (skb_len - 3));
+ break;
+ }
+
+ /*
+ * If select protocol is done on wtx req. do select protocol
+ * again with default values
+ */
+ if (wtx) {
+ wtx = false;
+ if (nfcddev->curr_protocol == NFC_PROTO_ISO14443) {
+ val_mm = cmd_array[ISO14443A_PROTOCOL_SELECT].
+ cmd_params[3];
+ result = iso14443_config_fdt(stcontext, val_mm);
+ } else if (nfcddev->curr_protocol ==
+ NFC_PROTO_ISO14443_B) {
+ val_mm = cmd_array[ISO14443B_PROTOCOL_SELECT].
+ cmd_params[3];
+ result = iso14443_config_fdt(stcontext, val_mm);
+ }
+ if (result) {
+ dev_err(dev, "Default config. setting error after WTX processing, err = 0x%x\n",
+ result);
+ goto end;
+ }
+ }
+
+ /* Call of provided callback */
+ cb_arg->complete_cb(stcontext->ddev,
+ cb_arg->cb_usrarg,
+ cb_arg->skb_resp);
+
+ kfree(cb_arg);
+ stcontext->complete_cb_arg = NULL;
+
+ return IRQ_HANDLED;
+
+end:
+ kfree_skb(cb_arg->skb_resp);
+ cb_arg->skb_resp = ERR_PTR(result);
+ cb_arg->complete_cb(stcontext->ddev,
+ cb_arg->cb_usrarg,
+ cb_arg->skb_resp);
+ kfree(cb_arg);
+ stcontext->complete_cb_arg = NULL;
+ wtx = false;
+
+ return IRQ_HANDLED;
+}
+
+/* NFC ops functions definition */
+int st95hf_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
+{
+ struct st95hf_context *stcontext = nfc_digital_get_drvdata(ddev);
+
+ if (type == NFC_DIGITAL_CONFIG_RF_TECH)
+ return st95hf_select_protocol(stcontext, param);
+
+ if (type == NFC_DIGITAL_CONFIG_FRAMING) {
+ switch (param) {
+ case NFC_DIGITAL_FRAMING_NFCA_SHORT:
+ stcontext->sendrcv_lastbyte = 0x07;
+ break;
+ case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
+ stcontext->sendrcv_lastbyte = 0x08;
+ break;
+ case NFC_DIGITAL_FRAMING_NFCA_T4T:
+ case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
+ case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
+ stcontext->sendrcv_lastbyte = 0x28;
+ break;
+ case NFC_DIGITAL_FRAMING_NFCB:
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int rf_off(struct st95hf_context *stcontext)
+{
+ int rc;
+ struct device *dev;
+
+ dev = &stcontext->nfcdev->dev;
+
+ rc = st95hf_send_cmd(stcontext, FIELD_OFF, 0, NULL);
+ if (rc) {
+ dev_err(dev, "protocol sel send fielf off, err = 0x%x\n",
+ rc);
+ return rc;
+ }
+
+ rc = spi_receive_generic(stcontext);
+ if (rc) {
+ dev_err(dev, "protocol sel response, err = 0x%x\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+int st95hf_in_send_cmd(struct nfc_digital_dev *ddev,
+ struct sk_buff *skb,
+ u16 timeout,
+ nfc_digital_cmd_complete_t cb,
+ void *arg)
+{
+ struct st95hf_context *stcontext = nfc_digital_get_drvdata(ddev);
+ int rc;
+ struct sk_buff *skb_resp;
+ struct st95_digital_cmd_complete_arg *cb_arg;
+ int len_data_to_tag = 0;
+ unsigned char *temp;
+
+ skb_resp = alloc_skb(MAX_RESPONSE_BUFFER_SIZE, GFP_KERNEL);
+ if (!skb_resp) {
+ rc = -ENOMEM;
+ goto error;
+ }
+
+ switch (stcontext->current_rf_tech) {
+ case NFC_DIGITAL_RF_TECH_106A:
+ len_data_to_tag = skb->len + 1;
+ temp = skb_put(skb, 1);
+ *(temp) = stcontext->sendrcv_lastbyte;
+ break;
+ case NFC_DIGITAL_RF_TECH_106B:
+ len_data_to_tag = skb->len;
+ break;
+ default:
+ rc = -EINVAL;
+ goto free_skb_resp;
+ }
+
+ skb_push(skb, 3);
+ *((unsigned char *)(skb->data)) = ST95HF_COMMAND_SEND;
+ *((unsigned char *)(skb->data) + 1) = SEND_RECEIVE_CMD;
+ *((unsigned char *)(skb->data) + 2) = len_data_to_tag;
+
+ cb_arg = kzalloc(sizeof(*cb_arg), GFP_KERNEL);
+ if (!cb_arg) {
+ rc = -ENOMEM;
+ goto free_skb_resp;
+ }
+
+ cb_arg->skb_resp = skb_resp;
+ cb_arg->cb_usrarg = arg;
+ cb_arg->complete_cb = cb;
+ if ((*((skb->data) + 3) == ISO14443A_RATS_REQ) &&
+ ddev->curr_protocol == NFC_PROTO_ISO14443)
+ cb_arg->rats = true;
+
+ /* save received arg in st95hf context */
+ stcontext->complete_cb_arg = cb_arg;
+
+ rc = spi_send_to_st95hf(&stcontext->spicontext, skb->data,
+ skb->len,
+ ASYNC);
+ if (rc) {
+ nfc_err(&stcontext->nfcdev->dev,
+ "Error %d trying to perform data_exchange", rc);
+ goto free_arg;
+ }
+
+ kfree_skb(skb);
+ return rc;
+
+free_arg:
+ kfree(cb_arg);
+ stcontext->complete_cb_arg = NULL;
+free_skb_resp:
+ kfree_skb(skb_resp);
+error:
+ kfree_skb(skb);
+
+ return rc;
+}
+
+/* p2p will be supported in a later release ! */
+int st95hf_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
+{
+ return 0;
+}
+
+int st95hf_tg_send_cmd(struct nfc_digital_dev *ddev,
+ struct sk_buff *skb,
+ u16 timeout,
+ nfc_digital_cmd_complete_t cb,
+ void *arg)
+{
+ return 0;
+}
+
+int st95hf_tg_listen(struct nfc_digital_dev *ddev,
+ u16 timeout,
+ nfc_digital_cmd_complete_t cb,
+ void *arg)
+{
+ return 0;
+}
+
+int st95hf_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech)
+{
+ return 0;
+}
+
+int st95hf_switch_rf(struct nfc_digital_dev *ddev, bool on)
+{
+ u8 rf_tech;
+ struct st95hf_context *stcontext = nfc_digital_get_drvdata(ddev);
+
+ rf_tech = ddev->curr_rf_tech;
+
+ if (on)
+ /* switch on RF field */
+ return st95hf_select_protocol(stcontext, rf_tech);
+
+ /* switch OFF RF field */
+ return rf_off(stcontext);
+}
+
+/* TODO st95hf_abort_cmd */
+void st95hf_abort_cmd(struct nfc_digital_dev *ddev)
+{
+}
+
+static struct nfc_digital_ops st95hf_nfc_digital_ops = {
+ .in_configure_hw = st95hf_in_configure_hw,
+ .in_send_cmd = st95hf_in_send_cmd,
+
+ .tg_listen = st95hf_tg_listen,
+ .tg_configure_hw = st95hf_tg_configure_hw,
+ .tg_send_cmd = st95hf_tg_send_cmd,
+ .tg_get_rf_tech = st95hf_tg_get_rf_tech,
+
+ .switch_rf = st95hf_switch_rf,
+ .abort_cmd = st95hf_abort_cmd,
+};
+
+static const struct spi_device_id st95hf_id[] = {
+ { "st95hf", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, st95hf_id);
+
+void tag_deactivation(struct nfc_dev *nfcdev)
+{
+ struct nfc_digital_dev *digitaldev;
+
+ digitaldev = (struct nfc_digital_dev *)dev_get_drvdata(&nfcdev->dev);
+
+ nfcdev->active_target = NULL;
+
+ digitaldev->curr_protocol = 0x0;
+}
+
+static int st95hf_probe(struct spi_device *nfc_spi_dev)
+{
+ int ret;
+
+ struct st95hf_context *st95context;
+ struct spi_context *spicontext;
+ struct device_node *np = nfc_spi_dev->dev.of_node;
+
+ pr_info("ST SPI SLAVE DRIVER (ST95HF R/W 14443A/B) PROBE CALLED\n");
+
+ st95context = devm_kzalloc(&nfc_spi_dev->dev,
+ sizeof(struct st95hf_context),
+ GFP_KERNEL);
+ if (!st95context)
+ return -ENOMEM;
+
+ spicontext = &st95context->spicontext;
+
+ spicontext->spidev = nfc_spi_dev;
+
+ st95context->fwi = cmd_array[ISO14443A_PROTOCOL_SELECT].cmd_params[2];
+
+ if (of_get_property(np, "st95hfvin-supply", NULL)) {
+ st95context->st95hf_supply =
+ devm_regulator_get(&nfc_spi_dev->dev, "st95hfvin");
+ if (IS_ERR(st95context->st95hf_supply)) {
+ dev_err(&nfc_spi_dev->dev, "failed to acquire regulator\n");
+ return PTR_ERR(st95context->st95hf_supply);
+ }
+
+ ret = regulator_enable(st95context->st95hf_supply);
+ if (ret) {
+ dev_err(&nfc_spi_dev->dev, "failed to enable regulator\n");
+ return ret;
+ }
+ }
+
+ init_waitqueue_head(&spicontext->st95wait_queue);
+
+ /*
+ * Store spicontext in spi device object for using it in
+ * remove & resume function
+ */
+ dev_set_drvdata(&nfc_spi_dev->dev, spicontext);
+
+ st95context->st95hf_enable_gpio =
+ of_get_named_gpio(nfc_spi_dev->dev.of_node,
+ "st,st95hf-enable-gpio",
+ 0);
+ if (st95context->st95hf_enable_gpio < 0) {
+ ret = st95context->st95hf_enable_gpio;
+ goto regulator_clean;
+ }
+
+ ret = gpio_request(st95context->st95hf_enable_gpio,
+ "st95hf_enable_gpio");
+ if (ret)
+ goto regulator_clean;
+
+ ret = gpio_direction_output(st95context->st95hf_enable_gpio, 1);
+ if (ret)
+ goto free_enable_gpio;
+
+ if (nfc_spi_dev->irq > 0) {
+ if (devm_request_threaded_irq(&nfc_spi_dev->dev,
+ nfc_spi_dev->irq,
+ irq_handler,
+ irq_thread_handler,
+ IRQF_SHARED,
+ "st95hf",
+ (void *)st95context) < 0) {
+ dev_err(&nfc_spi_dev->dev, "err: irq request for st95hf is failed\n");
+ ret = -ENODEV;
+ goto free_enable_gpio;
+ }
+ }
+
+ /*
+ * Send negative pulse to make st95hf active if last reset occur
+ * while in Tag detection low power state
+ */
+ st95hf_send_st95enable_negativepulse(st95context);
+
+ /*
+ * First reset SPI to handle hot reset and recurrent make run command
+ * It will put the device in Power ON state which make the state of
+ * device identical to state at the time of cold reset
+ */
+ ret = st95hf_send_spi_reset_sequence(st95context);
+ if (ret) {
+ dev_err(&nfc_spi_dev->dev, "err: spi_reset_sequence failed\n");
+ goto free_enable_gpio;
+ }
+
+ /* call PowerOnReset sequence of ST95hf to activate it */
+ ret = st95hf_por_sequence(st95context);
+ if (ret) {
+ dev_err(&nfc_spi_dev->dev, "err: por seq failed for st95hf\n");
+ goto free_enable_gpio;
+ }
+
+ /* Create NFC dev object and register with NFC Subsystem */
+ st95context->ddev = nfc_digital_allocate_device(&st95hf_nfc_digital_ops,
+ ST95HF_SUPPORTED_PROT,
+ ST95HF_CAPABILITIES,
+ ST95HF_HEADROOM_LEN,
+ ST95HF_TAILROOM_LEN);
+ if (!st95context->ddev) {
+ ret = -ENOMEM;
+ goto free_enable_gpio;
+ }
+
+ st95context->nfcdev = st95context->ddev->nfc_dev;
+
+ ret = nfc_digital_register_device(st95context->ddev);
+ if (ret) {
+ nfc_digital_free_device(st95context->ddev);
+ goto free_enable_gpio;
+ }
+
+ /* store st95context in nfc device object */
+ nfc_digital_set_drvdata(st95context->ddev, st95context);
+
+ return ret;
+
+free_enable_gpio:
+ gpio_free(st95context->st95hf_enable_gpio);
+regulator_clean:
+ if (st95context->st95hf_supply)
+ regulator_disable(st95context->st95hf_supply);
+ return ret;
+}
+
+static int st95hf_remove(struct spi_device *nfc_spi_dev)
+{
+ struct spi_context *spictx = dev_get_drvdata(&nfc_spi_dev->dev);
+
+ struct st95hf_context *stcontext = container_of(spictx,
+ struct st95hf_context,
+ spicontext);
+ if (stcontext) {
+ /* unregister nfc device */
+ nfc_digital_unregister_device(stcontext->ddev);
+
+ /* free the nfc device object */
+ nfc_digital_free_device(stcontext->ddev);
+
+ /* free GPIO pins */
+ gpio_free(stcontext->st95hf_enable_gpio);
+
+ /* disable regulator */
+ if (stcontext->st95hf_supply)
+ regulator_disable(stcontext->st95hf_supply);
+ }
+
+ return 0;
+}
+
+/* Register as SPI protocol driver */
+static struct spi_driver st95hf_driver = {
+ .driver = {
+ .name = "st95hf",
+ .owner = THIS_MODULE,
+ },
+ .id_table = st95hf_id,
+ .probe = st95hf_probe,
+ .remove = st95hf_remove,
+};
+
+/* module_spi_driver is helpler macro for registering a SPI driver */
+module_spi_driver(st95hf_driver);
+
+MODULE_AUTHOR("Shikha Singh <shikha.singh@xxxxxx>");
+MODULE_DESCRIPTION("ST95HF SPI protocol driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL v2");
--
1.8.2.1
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