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+/*
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+ * TI TRF7970a RFID/NFC Transceiver Driver
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+ *
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+ * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
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+ *
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+ * Author: Erick Macias <emacias@ti.com>
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+ * Author: Felipe Balbi <balbi@ti.com>
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+ * Author: Mark A. Greer <mgreer@animalcreek.com>
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 of
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+ * the License as published by the Free Software Foundation.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/device.h>
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+#include <linux/netdevice.h>
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+#include <linux/interrupt.h>
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+#include <linux/nfc.h>
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+#include <linux/skbuff.h>
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+#include <linux/delay.h>
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+#include <linux/gpio.h>
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+#include <linux/of.h>
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+#include <linux/of_gpio.h>
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+#include <linux/spi/spi.h>
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+#include <linux/regulator/consumer.h>
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+
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+#include <net/nfc/nfc.h>
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+#include <net/nfc/digital.h>
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+
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+/* There are 3 ways the host can communicate with the trf7970a:
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+ * parallel mode, SPI with Slave Select (SS) mode, and SPI without
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+ * SS mode. The driver only supports the two SPI modes.
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+ *
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+ * The trf7970a is very timing sensitive and the VIN, EN2, and EN
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+ * pins must asserted in that order and with specific delays in between.
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+ * The delays used in the driver were provided by TI and have been
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+ * confirmed to work with this driver.
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+ *
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+ * Timeouts are implemented using the delayed workqueue kernel facility.
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+ * Timeouts are required so things don't hang when there is no response
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+ * from the trf7970a (or tag). Using this mechanism creates a race with
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+ * interrupts, however. That is, an interrupt and a timeout could occur
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+ * closely enough together that one is blocked by the mutex while the other
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+ * executes. When the timeout handler executes first and blocks the
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+ * interrupt handler, it will eventually set the state to IDLE so the
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+ * interrupt handler will check the state and exit with no harm done.
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+ * When the interrupt handler executes first and blocks the timeout handler,
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+ * the cancel_delayed_work() call will know that it didn't cancel the
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+ * work item (i.e., timeout) and will return zero. That return code is
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+ * used by the timer handler to indicate that it should ignore the timeout
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+ * once its unblocked.
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+ *
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+ * Aborting an active command isn't as simple as it seems because the only
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+ * way to abort a command that's already been sent to the tag is so turn
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+ * off power to the tag. If we do that, though, we'd have to go through
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+ * the entire anticollision procedure again but the digital layer doesn't
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+ * support that. So, if an abort is received before trf7970a_in_send_cmd()
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+ * has sent the command to the tag, it simply returns -ECANCELED. If the
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+ * command has already been sent to the tag, then the driver continues
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+ * normally and recieves the response data (or error) but just before
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+ * sending the data upstream, it frees the rx_skb and sends -ECANCELED
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+ * upstream instead. If the command failed, that error will be sent
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+ * upstream.
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+ *
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+ * When recieving data from a tag and the interrupt status register has
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+ * only the SRX bit set, it means that all of the data has been received
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+ * (once what's in the fifo has been read). However, depending on timing
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+ * an interrupt status with only the SRX bit set may not be recived. In
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+ * those cases, the timeout mechanism is used to wait 5 ms in case more
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+ * data arrives. After 5 ms, it is assumed that all of the data has been
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+ * received and the accumulated rx data is sent upstream. The
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+ * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose
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+ * (i.e., it indicates that some data has been received but we're not sure
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+ * if there is more coming so a timeout in this state means all data has
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+ * been received and there isn't an error). The delay is 5 ms since delays
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+ * over 2 ms have been observed during testing (a little extra just in case).
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+ *
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+ * Type 2 write and sector select commands respond with a 4-bit ACK or NACK.
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+ * Having only 4 bits in the FIFO won't normally generate an interrupt so
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+ * driver enables the '4_bit_RX' bit of the Special Functions register 1
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+ * to cause an interrupt in that case. Leaving that bit for a read command
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+ * messes up the data returned so it is only enabled when the framing is
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+ * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command.
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+ * Unfortunately, that means that the driver has to peek into tx frames
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+ * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by
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+ * the trf7970a_per_cmd_config() routine.
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+ *
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+ * ISO/IEC 15693 frames specify whether to use single or double sub-carrier
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+ * frequencies and whether to use low or high data rates in the flags byte
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+ * of the frame. This means that the driver has to peek at all 15693 frames
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+ * to determine what speed to set the communication to. In addition, write
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+ * and lock commands use the OPTION flag to indicate that an EOF must be
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+ * sent to the tag before it will send its response. So the driver has to
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+ * examine all frames for that reason too.
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+ *
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+ * It is unclear how long to wait before sending the EOF. According to the
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+ * Note under Table 1-1 in section 1.6 of
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+ * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least
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+ * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long
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+ * enough. For this reason, the driver waits 20 ms which seems to work
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+ * reliably.
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+ */
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+
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+#define TRF7970A_SUPPORTED_PROTOCOLS \
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+ (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \
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+ NFC_PROTO_ISO15693_MASK)
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+
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+/* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
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+ * on what the current framing is, the address of the TX length byte 1
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+ * register (0x1d), and the 2 byte length of the data to be transmitted.
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+ * That totals 5 bytes.
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+ */
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+#define TRF7970A_TX_SKB_HEADROOM 5
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+
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+#define TRF7970A_RX_SKB_ALLOC_SIZE 256
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+
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+#define TRF7970A_FIFO_SIZE 128
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+
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+/* TX length is 3 nibbles long ==> 4KB - 1 bytes max */
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+#define TRF7970A_TX_MAX (4096 - 1)
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+
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+#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 5
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+#define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 3
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+#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 20
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+
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+/* Quirks */
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+/* Erratum: When reading IRQ Status register on trf7970a, we must issue a
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+ * read continuous command for IRQ Status and Collision Position registers.
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+ */
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+#define TRF7970A_QUIRK_IRQ_STATUS_READ_ERRATA BIT(0)
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+
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+/* Direct commands */
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+#define TRF7970A_CMD_IDLE 0x00
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+#define TRF7970A_CMD_SOFT_INIT 0x03
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+#define TRF7970A_CMD_RF_COLLISION 0x04
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+#define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05
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+#define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06
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+#define TRF7970A_CMD_FIFO_RESET 0x0f
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+#define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10
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+#define TRF7970A_CMD_TRANSMIT 0x11
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+#define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12
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+#define TRF7970A_CMD_DELAY_TRANSMIT 0x13
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+#define TRF7970A_CMD_EOF 0x14
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+#define TRF7970A_CMD_CLOSE_SLOT 0x15
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+#define TRF7970A_CMD_BLOCK_RX 0x16
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+#define TRF7970A_CMD_ENABLE_RX 0x17
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+#define TRF7970A_CMD_TEST_EXT_RF 0x18
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+#define TRF7970A_CMD_TEST_INT_RF 0x19
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+#define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a
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+
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+/* Bits determining whether its a direct command or register R/W,
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+ * whether to use a continuous SPI transaction or not, and the actual
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+ * direct cmd opcode or regster address.
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+ */
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+#define TRF7970A_CMD_BIT_CTRL BIT(7)
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+#define TRF7970A_CMD_BIT_RW BIT(6)
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+#define TRF7970A_CMD_BIT_CONTINUOUS BIT(5)
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+#define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f)
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+
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+/* Registers addresses */
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+#define TRF7970A_CHIP_STATUS_CTRL 0x00
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+#define TRF7970A_ISO_CTRL 0x01
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+#define TRF7970A_ISO14443B_TX_OPTIONS 0x02
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+#define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03
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+#define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04
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+#define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05
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+#define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06
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+#define TRF7970A_RX_NO_RESPONSE_WAIT 0x07
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+#define TRF7970A_RX_WAIT_TIME 0x08
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+#define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09
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+#define TRF7970A_RX_SPECIAL_SETTINGS 0x0a
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+#define TRF7970A_REG_IO_CTRL 0x0b
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+#define TRF7970A_IRQ_STATUS 0x0c
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+#define TRF7970A_COLLISION_IRQ_MASK 0x0d
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+#define TRF7970A_COLLISION_POSITION 0x0e
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+#define TRF7970A_RSSI_OSC_STATUS 0x0f
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+#define TRF7970A_SPECIAL_FCN_REG1 0x10
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+#define TRF7970A_SPECIAL_FCN_REG2 0x11
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+#define TRF7970A_RAM1 0x12
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+#define TRF7970A_RAM2 0x13
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14
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+#define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16
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+#define TRF7970A_NFCID1 0x17
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+#define TRF7970A_NFC_TARGET_LEVEL 0x18
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+#define TRF79070A_NFC_TARGET_PROTOCOL 0x19
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+#define TRF7970A_TEST_REGISTER1 0x1a
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+#define TRF7970A_TEST_REGISTER2 0x1b
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+#define TRF7970A_FIFO_STATUS 0x1c
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+#define TRF7970A_TX_LENGTH_BYTE1 0x1d
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+#define TRF7970A_TX_LENGTH_BYTE2 0x1e
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+#define TRF7970A_FIFO_IO_REGISTER 0x1f
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+
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+/* Chip Status Control Register Bits */
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+#define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0)
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+#define TRF7970A_CHIP_STATUS_REC_ON BIT(1)
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+#define TRF7970A_CHIP_STATUS_AGC_ON BIT(2)
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+#define TRF7970A_CHIP_STATUS_PM_ON BIT(3)
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+#define TRF7970A_CHIP_STATUS_RF_PWR BIT(4)
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+#define TRF7970A_CHIP_STATUS_RF_ON BIT(5)
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+#define TRF7970A_CHIP_STATUS_DIRECT BIT(6)
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+#define TRF7970A_CHIP_STATUS_STBY BIT(7)
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+
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+/* ISO Control Register Bits */
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+#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00
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+#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01
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+#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02
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+#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03
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+#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04
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+#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05
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+#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06
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+#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07
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+#define TRF7970A_ISO_CTRL_14443A_106 0x08
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+#define TRF7970A_ISO_CTRL_14443A_212 0x09
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+#define TRF7970A_ISO_CTRL_14443A_424 0x0a
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+#define TRF7970A_ISO_CTRL_14443A_848 0x0b
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+#define TRF7970A_ISO_CTRL_14443B_106 0x0c
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+#define TRF7970A_ISO_CTRL_14443B_212 0x0d
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+#define TRF7970A_ISO_CTRL_14443B_424 0x0e
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+#define TRF7970A_ISO_CTRL_14443B_848 0x0f
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+#define TRF7970A_ISO_CTRL_FELICA_212 0x1a
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+#define TRF7970A_ISO_CTRL_FELICA_424 0x1b
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+#define TRF7970A_ISO_CTRL_RFID BIT(5)
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+#define TRF7970A_ISO_CTRL_DIR_MODE BIT(6)
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+#define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */
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+
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+#define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f
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+
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+/* Modulator and SYS_CLK Control Register Bits */
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+#define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7)
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+#define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0))
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+#define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1))
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+#define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2))
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+#define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3))
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+#define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4))
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+#define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5))
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+#define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6))
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+#define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7))
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+#define TRF7970A_MODULATOR_EN_ANA BIT(3)
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+#define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4)
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+#define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0))
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+#define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1))
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+#define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2))
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+#define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3))
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+#define TRF7970A_MODULATOR_EN_OOK BIT(6)
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+#define TRF7970A_MODULATOR_27MHZ BIT(7)
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+
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+/* IRQ Status Register Bits */
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+#define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */
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+#define TRF7970A_IRQ_STATUS_COL BIT(1)
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+#define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2)
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+#define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3)
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+#define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4)
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+#define TRF7970A_IRQ_STATUS_FIFO BIT(5)
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+#define TRF7970A_IRQ_STATUS_SRX BIT(6)
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+#define TRF7970A_IRQ_STATUS_TX BIT(7)
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+
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+#define TRF7970A_IRQ_STATUS_ERROR \
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+ (TRF7970A_IRQ_STATUS_COL | \
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+ TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \
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+ TRF7970A_IRQ_STATUS_PARITY_ERROR | \
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+ TRF7970A_IRQ_STATUS_CRC_ERROR)
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+
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+#define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0)
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+#define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1)
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+#define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2)
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+#define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3)
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+#define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4)
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+#define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5)
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+
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2)
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2)
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2)
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2)
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2
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+#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3
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+
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+#define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7)
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+
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+/* NFC (ISO/IEC 14443A) Type 2 Tag commands */
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+#define NFC_T2T_CMD_READ 0x30
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+
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+/* ISO 15693 commands codes */
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+#define ISO15693_CMD_INVENTORY 0x01
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+#define ISO15693_CMD_READ_SINGLE_BLOCK 0x20
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+#define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21
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+#define ISO15693_CMD_LOCK_BLOCK 0x22
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+#define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23
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+#define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24
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+#define ISO15693_CMD_SELECT 0x25
|
|
|
+#define ISO15693_CMD_RESET_TO_READY 0x26
|
|
|
+#define ISO15693_CMD_WRITE_AFI 0x27
|
|
|
+#define ISO15693_CMD_LOCK_AFI 0x28
|
|
|
+#define ISO15693_CMD_WRITE_DSFID 0x29
|
|
|
+#define ISO15693_CMD_LOCK_DSFID 0x2a
|
|
|
+#define ISO15693_CMD_GET_SYSTEM_INFO 0x2b
|
|
|
+#define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c
|
|
|
+
|
|
|
+/* ISO 15693 request and response flags */
|
|
|
+#define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0)
|
|
|
+#define ISO15693_REQ_FLAG_DATA_RATE BIT(1)
|
|
|
+#define ISO15693_REQ_FLAG_INVENTORY BIT(2)
|
|
|
+#define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3)
|
|
|
+#define ISO15693_REQ_FLAG_SELECT BIT(4)
|
|
|
+#define ISO15693_REQ_FLAG_AFI BIT(4)
|
|
|
+#define ISO15693_REQ_FLAG_ADDRESS BIT(5)
|
|
|
+#define ISO15693_REQ_FLAG_NB_SLOTS BIT(5)
|
|
|
+#define ISO15693_REQ_FLAG_OPTION BIT(6)
|
|
|
+
|
|
|
+#define ISO15693_REQ_FLAG_SPEED_MASK \
|
|
|
+ (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE)
|
|
|
+
|
|
|
+enum trf7970a_state {
|
|
|
+ TRF7970A_ST_OFF,
|
|
|
+ TRF7970A_ST_IDLE,
|
|
|
+ TRF7970A_ST_IDLE_RX_BLOCKED,
|
|
|
+ TRF7970A_ST_WAIT_FOR_TX_FIFO,
|
|
|
+ TRF7970A_ST_WAIT_FOR_RX_DATA,
|
|
|
+ TRF7970A_ST_WAIT_FOR_RX_DATA_CONT,
|
|
|
+ TRF7970A_ST_WAIT_TO_ISSUE_EOF,
|
|
|
+ TRF7970A_ST_MAX
|
|
|
+};
|
|
|
+
|
|
|
+struct trf7970a {
|
|
|
+ enum trf7970a_state state;
|
|
|
+ struct device *dev;
|
|
|
+ struct spi_device *spi;
|
|
|
+ struct regulator *regulator;
|
|
|
+ struct nfc_digital_dev *ddev;
|
|
|
+ u32 quirks;
|
|
|
+ bool powering_up;
|
|
|
+ bool aborting;
|
|
|
+ struct sk_buff *tx_skb;
|
|
|
+ struct sk_buff *rx_skb;
|
|
|
+ nfc_digital_cmd_complete_t cb;
|
|
|
+ void *cb_arg;
|
|
|
+ u8 iso_ctrl;
|
|
|
+ u8 special_fcn_reg1;
|
|
|
+ int technology;
|
|
|
+ int framing;
|
|
|
+ u8 tx_cmd;
|
|
|
+ bool issue_eof;
|
|
|
+ int en2_gpio;
|
|
|
+ int en_gpio;
|
|
|
+ struct mutex lock;
|
|
|
+ unsigned int timeout;
|
|
|
+ bool ignore_timeout;
|
|
|
+ struct delayed_work timeout_work;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)
|
|
|
+{
|
|
|
+ u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode);
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "cmd: 0x%x\n", cmd);
|
|
|
+
|
|
|
+ ret = spi_write(trf->spi, &cmd, 1);
|
|
|
+ if (ret)
|
|
|
+ dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd,
|
|
|
+ ret);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)
|
|
|
+{
|
|
|
+ u8 addr = TRF7970A_CMD_BIT_RW | reg;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ ret = spi_write_then_read(trf->spi, &addr, 1, val, 1);
|
|
|
+ if (ret)
|
|
|
+ dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
|
|
|
+ ret);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_read_cont(struct trf7970a *trf, u8 reg,
|
|
|
+ u8 *buf, size_t len)
|
|
|
+{
|
|
|
+ u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
|
|
|
+
|
|
|
+ ret = spi_write_then_read(trf->spi, &addr, 1, buf, len);
|
|
|
+ if (ret)
|
|
|
+ dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
|
|
|
+ ret);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)
|
|
|
+{
|
|
|
+ u8 buf[2] = { reg, val };
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val);
|
|
|
+
|
|
|
+ ret = spi_write(trf->spi, buf, 2);
|
|
|
+ if (ret)
|
|
|
+ dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__,
|
|
|
+ buf[0], buf[1], ret);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+ u8 buf[2];
|
|
|
+ u8 addr;
|
|
|
+
|
|
|
+ addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW;
|
|
|
+
|
|
|
+ if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ_ERRATA) {
|
|
|
+ addr |= TRF7970A_CMD_BIT_CONTINUOUS;
|
|
|
+ ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
|
|
|
+ } else {
|
|
|
+ ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ret)
|
|
|
+ dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n",
|
|
|
+ __func__, ret);
|
|
|
+ else
|
|
|
+ *status = buf[0];
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_send_upstream(struct trf7970a *trf)
|
|
|
+{
|
|
|
+ u8 rssi;
|
|
|
+
|
|
|
+ dev_kfree_skb_any(trf->tx_skb);
|
|
|
+ trf->tx_skb = NULL;
|
|
|
+
|
|
|
+ if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting)
|
|
|
+ print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE,
|
|
|
+ 16, 1, trf->rx_skb->data, trf->rx_skb->len,
|
|
|
+ false);
|
|
|
+
|
|
|
+ /* According to the manual it is "good form" to reset the fifo and
|
|
|
+ * read the RSSI levels & oscillator status register here. It doesn't
|
|
|
+ * explain why.
|
|
|
+ */
|
|
|
+ trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
|
+ trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi);
|
|
|
+
|
|
|
+ trf->state = TRF7970A_ST_IDLE;
|
|
|
+
|
|
|
+ if (trf->aborting) {
|
|
|
+ dev_dbg(trf->dev, "Abort process complete\n");
|
|
|
+
|
|
|
+ if (!IS_ERR(trf->rx_skb)) {
|
|
|
+ kfree_skb(trf->rx_skb);
|
|
|
+ trf->rx_skb = ERR_PTR(-ECANCELED);
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->aborting = false;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
|
|
|
+
|
|
|
+ trf->rx_skb = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)
|
|
|
+{
|
|
|
+ dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno);
|
|
|
+
|
|
|
+ kfree_skb(trf->rx_skb);
|
|
|
+ trf->rx_skb = ERR_PTR(errno);
|
|
|
+
|
|
|
+ trf7970a_send_upstream(trf);
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
|
|
|
+ unsigned int len)
|
|
|
+{
|
|
|
+ unsigned int timeout;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE,
|
|
|
+ 16, 1, skb->data, len, false);
|
|
|
+
|
|
|
+ ret = spi_write(trf->spi, skb->data, len);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__,
|
|
|
+ ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ skb_pull(skb, len);
|
|
|
+
|
|
|
+ if (skb->len > 0) {
|
|
|
+ trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO;
|
|
|
+ timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT;
|
|
|
+ } else {
|
|
|
+ if (trf->issue_eof) {
|
|
|
+ trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF;
|
|
|
+ timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF;
|
|
|
+ } else {
|
|
|
+ trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
|
|
|
+ timeout = trf->timeout;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout,
|
|
|
+ trf->state);
|
|
|
+
|
|
|
+ schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_fill_fifo(struct trf7970a *trf)
|
|
|
+{
|
|
|
+ struct sk_buff *skb = trf->tx_skb;
|
|
|
+ unsigned int len;
|
|
|
+ int ret;
|
|
|
+ u8 fifo_bytes;
|
|
|
+
|
|
|
+ ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
|
|
|
+ if (ret) {
|
|
|
+ trf7970a_send_err_upstream(trf, ret);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
|
|
|
+
|
|
|
+ if (fifo_bytes & TRF7970A_FIFO_STATUS_OVERFLOW) {
|
|
|
+ dev_err(trf->dev, "%s - fifo overflow: 0x%x\n", __func__,
|
|
|
+ fifo_bytes);
|
|
|
+ trf7970a_send_err_upstream(trf, -EIO);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Calculate how much more data can be written to the fifo */
|
|
|
+ len = TRF7970A_FIFO_SIZE - fifo_bytes;
|
|
|
+ len = min(skb->len, len);
|
|
|
+
|
|
|
+ ret = trf7970a_transmit(trf, skb, len);
|
|
|
+ if (ret)
|
|
|
+ trf7970a_send_err_upstream(trf, ret);
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)
|
|
|
+{
|
|
|
+ struct sk_buff *skb = trf->rx_skb;
|
|
|
+ int ret;
|
|
|
+ u8 fifo_bytes;
|
|
|
+
|
|
|
+ if (status & TRF7970A_IRQ_STATUS_ERROR) {
|
|
|
+ trf7970a_send_err_upstream(trf, -EIO);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
|
|
|
+ if (ret) {
|
|
|
+ trf7970a_send_err_upstream(trf, ret);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
|
|
|
+
|
|
|
+ if (!fifo_bytes)
|
|
|
+ goto no_rx_data;
|
|
|
+
|
|
|
+ if (fifo_bytes & TRF7970A_FIFO_STATUS_OVERFLOW) {
|
|
|
+ dev_err(trf->dev, "%s - fifo overflow: 0x%x\n", __func__,
|
|
|
+ fifo_bytes);
|
|
|
+ trf7970a_send_err_upstream(trf, -EIO);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (fifo_bytes > skb_tailroom(skb)) {
|
|
|
+ skb = skb_copy_expand(skb, skb_headroom(skb),
|
|
|
+ max_t(int, fifo_bytes,
|
|
|
+ TRF7970A_RX_SKB_ALLOC_SIZE),
|
|
|
+ GFP_KERNEL);
|
|
|
+ if (!skb) {
|
|
|
+ trf7970a_send_err_upstream(trf, -ENOMEM);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ kfree_skb(trf->rx_skb);
|
|
|
+ trf->rx_skb = skb;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,
|
|
|
+ skb_put(skb, fifo_bytes), fifo_bytes);
|
|
|
+ if (ret) {
|
|
|
+ trf7970a_send_err_upstream(trf, ret);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */
|
|
|
+ if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) &&
|
|
|
+ (trf->special_fcn_reg1 ==
|
|
|
+ TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {
|
|
|
+ skb->data[0] >>= 4;
|
|
|
+ status = TRF7970A_IRQ_STATUS_SRX;
|
|
|
+ } else {
|
|
|
+ trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT;
|
|
|
+ }
|
|
|
+
|
|
|
+no_rx_data:
|
|
|
+ if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */
|
|
|
+ trf7970a_send_upstream(trf);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Setting timeout for %d ms\n",
|
|
|
+ TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT);
|
|
|
+
|
|
|
+ schedule_delayed_work(&trf->timeout_work,
|
|
|
+ msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT));
|
|
|
+}
|
|
|
+
|
|
|
+static irqreturn_t trf7970a_irq(int irq, void *dev_id)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = dev_id;
|
|
|
+ int ret;
|
|
|
+ u8 status;
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+
|
|
|
+ if (trf->state == TRF7970A_ST_OFF) {
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return IRQ_NONE;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = trf7970a_read_irqstatus(trf, &status);
|
|
|
+ if (ret) {
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return IRQ_NONE;
|
|
|
+ }
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state,
|
|
|
+ status);
|
|
|
+
|
|
|
+ if (!status) {
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return IRQ_NONE;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (trf->state) {
|
|
|
+ case TRF7970A_ST_IDLE:
|
|
|
+ case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
|
+ /* If getting interrupts caused by RF noise, turn off the
|
|
|
+ * receiver to avoid unnecessary interrupts. It will be
|
|
|
+ * turned back on in trf7970a_in_send_cmd() when the next
|
|
|
+ * command is issued.
|
|
|
+ */
|
|
|
+ if (status & TRF7970A_IRQ_STATUS_ERROR) {
|
|
|
+ trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);
|
|
|
+ trf->state = TRF7970A_ST_IDLE_RX_BLOCKED;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
|
+ break;
|
|
|
+ case TRF7970A_ST_WAIT_FOR_TX_FIFO:
|
|
|
+ if (status & TRF7970A_IRQ_STATUS_TX) {
|
|
|
+ trf->ignore_timeout =
|
|
|
+ !cancel_delayed_work(&trf->timeout_work);
|
|
|
+ trf7970a_fill_fifo(trf);
|
|
|
+ } else {
|
|
|
+ trf7970a_send_err_upstream(trf, -EIO);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case TRF7970A_ST_WAIT_FOR_RX_DATA:
|
|
|
+ case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
|
|
|
+ if (status & TRF7970A_IRQ_STATUS_SRX) {
|
|
|
+ trf->ignore_timeout =
|
|
|
+ !cancel_delayed_work(&trf->timeout_work);
|
|
|
+ trf7970a_drain_fifo(trf, status);
|
|
|
+ } else if (!(status & TRF7970A_IRQ_STATUS_TX)) {
|
|
|
+ trf7970a_send_err_upstream(trf, -EIO);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
|
|
|
+ if (status != TRF7970A_IRQ_STATUS_TX)
|
|
|
+ trf7970a_send_err_upstream(trf, -EIO);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
|
|
|
+ __func__, trf->state);
|
|
|
+ }
|
|
|
+
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return IRQ_HANDLED;
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_issue_eof(struct trf7970a *trf)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Issuing EOF\n");
|
|
|
+
|
|
|
+ ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
|
+ if (ret)
|
|
|
+ trf7970a_send_err_upstream(trf, ret);
|
|
|
+
|
|
|
+ ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
|
|
|
+ if (ret)
|
|
|
+ trf7970a_send_err_upstream(trf, ret);
|
|
|
+
|
|
|
+ trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n",
|
|
|
+ trf->timeout, trf->state);
|
|
|
+
|
|
|
+ schedule_delayed_work(&trf->timeout_work,
|
|
|
+ msecs_to_jiffies(trf->timeout));
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_timeout_work_handler(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = container_of(work, struct trf7970a,
|
|
|
+ timeout_work.work);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n",
|
|
|
+ trf->state, trf->ignore_timeout);
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+
|
|
|
+ if (trf->ignore_timeout)
|
|
|
+ trf->ignore_timeout = false;
|
|
|
+ else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)
|
|
|
+ trf7970a_send_upstream(trf); /* No more rx data so send up */
|
|
|
+ else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
|
|
|
+ trf7970a_issue_eof(trf);
|
|
|
+ else
|
|
|
+ trf7970a_send_err_upstream(trf, -ETIMEDOUT);
|
|
|
+
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_init(struct trf7970a *trf)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state);
|
|
|
+
|
|
|
+ ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+
|
|
|
+ ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+
|
|
|
+ ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
|
|
|
+ TRF7970A_MODULATOR_DEPTH_OOK);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+
|
|
|
+ ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,
|
|
|
+ TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |
|
|
|
+ TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+
|
|
|
+ ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+
|
|
|
+ trf->special_fcn_reg1 = 0;
|
|
|
+
|
|
|
+ ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
|
|
|
+ TRF7970A_CHIP_STATUS_RF_ON |
|
|
|
+ TRF7970A_CHIP_STATUS_VRS5_3);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+err_out:
|
|
|
+ dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_switch_rf_off(struct trf7970a *trf)
|
|
|
+{
|
|
|
+ dev_dbg(trf->dev, "Switching rf off\n");
|
|
|
+
|
|
|
+ gpio_set_value(trf->en_gpio, 0);
|
|
|
+ gpio_set_value(trf->en2_gpio, 0);
|
|
|
+
|
|
|
+ trf->aborting = false;
|
|
|
+ trf->state = TRF7970A_ST_OFF;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_switch_rf_on(struct trf7970a *trf)
|
|
|
+{
|
|
|
+ unsigned long delay;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Switching rf on\n");
|
|
|
+
|
|
|
+ if (trf->powering_up)
|
|
|
+ usleep_range(5000, 6000);
|
|
|
+
|
|
|
+ gpio_set_value(trf->en2_gpio, 1);
|
|
|
+ usleep_range(1000, 2000);
|
|
|
+ gpio_set_value(trf->en_gpio, 1);
|
|
|
+
|
|
|
+ /* The delay between enabling the trf7970a and issuing the first
|
|
|
+ * command is significantly longer the very first time after powering
|
|
|
+ * up. Make sure the longer delay is only done the first time.
|
|
|
+ */
|
|
|
+ if (trf->powering_up) {
|
|
|
+ delay = 20000;
|
|
|
+ trf->powering_up = false;
|
|
|
+ } else {
|
|
|
+ delay = 5000;
|
|
|
+ }
|
|
|
+
|
|
|
+ usleep_range(delay, delay + 1000);
|
|
|
+
|
|
|
+ ret = trf7970a_init(trf);
|
|
|
+ if (ret)
|
|
|
+ trf7970a_switch_rf_off(trf);
|
|
|
+ else
|
|
|
+ trf->state = TRF7970A_ST_IDLE;
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on);
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+
|
|
|
+ if (on) {
|
|
|
+ switch (trf->state) {
|
|
|
+ case TRF7970A_ST_OFF:
|
|
|
+ ret = trf7970a_switch_rf_on(trf);
|
|
|
+ break;
|
|
|
+ case TRF7970A_ST_IDLE:
|
|
|
+ case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_err(trf->dev, "%s - Invalid request: %d %d\n",
|
|
|
+ __func__, trf->state, on);
|
|
|
+ trf7970a_switch_rf_off(trf);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ switch (trf->state) {
|
|
|
+ case TRF7970A_ST_OFF:
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_err(trf->dev, "%s - Invalid request: %d %d\n",
|
|
|
+ __func__, trf->state, on);
|
|
|
+ /* FALLTHROUGH */
|
|
|
+ case TRF7970A_ST_IDLE:
|
|
|
+ case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
|
+ trf7970a_switch_rf_off(trf);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_config_rf_tech(struct trf7970a *trf, int tech)
|
|
|
+{
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "rf technology: %d\n", tech);
|
|
|
+
|
|
|
+ switch (tech) {
|
|
|
+ case NFC_DIGITAL_RF_TECH_106A:
|
|
|
+ trf->iso_ctrl = TRF7970A_ISO_CTRL_14443A_106;
|
|
|
+ break;
|
|
|
+ case NFC_DIGITAL_RF_TECH_ISO15693:
|
|
|
+ trf->iso_ctrl = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->technology = tech;
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_config_framing(struct trf7970a *trf, int framing)
|
|
|
+{
|
|
|
+ dev_dbg(trf->dev, "framing: %d\n", framing);
|
|
|
+
|
|
|
+ switch (framing) {
|
|
|
+ case NFC_DIGITAL_FRAMING_NFCA_SHORT:
|
|
|
+ case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
|
|
|
+ trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
|
|
|
+ trf->iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
|
+ break;
|
|
|
+ case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
|
|
|
+ case NFC_DIGITAL_FRAMING_NFCA_T4T:
|
|
|
+ case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
|
|
|
+ case NFC_DIGITAL_FRAMING_ISO15693_T5T:
|
|
|
+ trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
|
+ trf->iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
|
+ break;
|
|
|
+ case NFC_DIGITAL_FRAMING_NFCA_T2T:
|
|
|
+ trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
|
+ trf->iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->framing = framing;
|
|
|
+
|
|
|
+ return trf7970a_write(trf, TRF7970A_ISO_CTRL, trf->iso_ctrl);
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,
|
|
|
+ int param)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+
|
|
|
+ if (trf->state == TRF7970A_ST_OFF) {
|
|
|
+ ret = trf7970a_switch_rf_on(trf);
|
|
|
+ if (ret)
|
|
|
+ goto err_out;
|
|
|
+ }
|
|
|
+
|
|
|
+ switch (type) {
|
|
|
+ case NFC_DIGITAL_CONFIG_RF_TECH:
|
|
|
+ ret = trf7970a_config_rf_tech(trf, param);
|
|
|
+ break;
|
|
|
+ case NFC_DIGITAL_CONFIG_FRAMING:
|
|
|
+ ret = trf7970a_config_framing(trf, param);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_dbg(trf->dev, "Unknown type: %d\n", type);
|
|
|
+ ret = -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+err_out:
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
|
|
|
+{
|
|
|
+ switch (cmd) {
|
|
|
+ case ISO15693_CMD_WRITE_SINGLE_BLOCK:
|
|
|
+ case ISO15693_CMD_LOCK_BLOCK:
|
|
|
+ case ISO15693_CMD_WRITE_MULTIPLE_BLOCK:
|
|
|
+ case ISO15693_CMD_WRITE_AFI:
|
|
|
+ case ISO15693_CMD_LOCK_AFI:
|
|
|
+ case ISO15693_CMD_WRITE_DSFID:
|
|
|
+ case ISO15693_CMD_LOCK_DSFID:
|
|
|
+ return 1;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
|
|
|
+{
|
|
|
+ u8 *req = skb->data;
|
|
|
+ u8 special_fcn_reg1, iso_ctrl;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ trf->issue_eof = false;
|
|
|
+
|
|
|
+ /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in
|
|
|
+ * special functions register 1 is cleared; otherwise, its a write or
|
|
|
+ * sector select command and '4_bit_RX' must be set.
|
|
|
+ *
|
|
|
+ * When issuing an ISO 15693 command, inspect the flags byte to see
|
|
|
+ * what speed to use. Also, remember if the OPTION flag is set on
|
|
|
+ * a Type 5 write or lock command so the driver will know that it
|
|
|
+ * has to send an EOF in order to get a response.
|
|
|
+ */
|
|
|
+ if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) &&
|
|
|
+ (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {
|
|
|
+ if (req[0] == NFC_T2T_CMD_READ)
|
|
|
+ special_fcn_reg1 = 0;
|
|
|
+ else
|
|
|
+ special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX;
|
|
|
+
|
|
|
+ if (special_fcn_reg1 != trf->special_fcn_reg1) {
|
|
|
+ ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,
|
|
|
+ special_fcn_reg1);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ trf->special_fcn_reg1 = special_fcn_reg1;
|
|
|
+ }
|
|
|
+ } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) {
|
|
|
+ iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;
|
|
|
+
|
|
|
+ switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) {
|
|
|
+ case 0x00:
|
|
|
+ iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662;
|
|
|
+ break;
|
|
|
+ case ISO15693_REQ_FLAG_SUB_CARRIER:
|
|
|
+ iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a;
|
|
|
+ break;
|
|
|
+ case ISO15693_REQ_FLAG_DATA_RATE:
|
|
|
+ iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
|
|
|
+ break;
|
|
|
+ case (ISO15693_REQ_FLAG_SUB_CARRIER |
|
|
|
+ ISO15693_REQ_FLAG_DATA_RATE):
|
|
|
+ iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (iso_ctrl != trf->iso_ctrl) {
|
|
|
+ ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ trf->iso_ctrl = iso_ctrl;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) &&
|
|
|
+ trf7970a_is_iso15693_write_or_lock(req[1]) &&
|
|
|
+ (req[0] & ISO15693_REQ_FLAG_OPTION))
|
|
|
+ trf->issue_eof = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev,
|
|
|
+ struct sk_buff *skb, u16 timeout,
|
|
|
+ nfc_digital_cmd_complete_t cb, void *arg)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+ char *prefix;
|
|
|
+ unsigned int len;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
|
|
|
+ trf->state, timeout, skb->len);
|
|
|
+
|
|
|
+ if (skb->len > TRF7970A_TX_MAX)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+
|
|
|
+ if ((trf->state != TRF7970A_ST_IDLE) &&
|
|
|
+ (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
|
|
|
+ dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
|
|
|
+ trf->state);
|
|
|
+ ret = -EIO;
|
|
|
+ goto out_err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (trf->aborting) {
|
|
|
+ dev_dbg(trf->dev, "Abort process complete\n");
|
|
|
+ trf->aborting = false;
|
|
|
+ ret = -ECANCELED;
|
|
|
+ goto out_err;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
|
|
|
+ GFP_KERNEL);
|
|
|
+ if (!trf->rx_skb) {
|
|
|
+ dev_dbg(trf->dev, "Can't alloc rx_skb\n");
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto out_err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) {
|
|
|
+ ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
|
|
|
+ if (ret)
|
|
|
+ goto out_err;
|
|
|
+
|
|
|
+ trf->state = TRF7970A_ST_IDLE;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = trf7970a_per_cmd_config(trf, skb);
|
|
|
+ if (ret)
|
|
|
+ goto out_err;
|
|
|
+
|
|
|
+ trf->ddev = ddev;
|
|
|
+ trf->tx_skb = skb;
|
|
|
+ trf->cb = cb;
|
|
|
+ trf->cb_arg = arg;
|
|
|
+ trf->timeout = timeout;
|
|
|
+ trf->ignore_timeout = false;
|
|
|
+
|
|
|
+ len = skb->len;
|
|
|
+ prefix = skb_push(skb, TRF7970A_TX_SKB_HEADROOM);
|
|
|
+
|
|
|
+ /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
|
|
|
+ * on what the current framing is, the address of the TX length byte 1
|
|
|
+ * register (0x1d), and the 2 byte length of the data to be transmitted.
|
|
|
+ */
|
|
|
+ prefix[0] = TRF7970A_CMD_BIT_CTRL |
|
|
|
+ TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET);
|
|
|
+ prefix[1] = TRF7970A_CMD_BIT_CTRL |
|
|
|
+ TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd);
|
|
|
+ prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1;
|
|
|
+
|
|
|
+ if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {
|
|
|
+ prefix[3] = 0x00;
|
|
|
+ prefix[4] = 0x0f; /* 7 bits */
|
|
|
+ } else {
|
|
|
+ prefix[3] = (len & 0xf00) >> 4;
|
|
|
+ prefix[3] |= ((len & 0xf0) >> 4);
|
|
|
+ prefix[4] = ((len & 0x0f) << 4);
|
|
|
+ }
|
|
|
+
|
|
|
+ len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
|
|
|
+
|
|
|
+ usleep_range(1000, 2000);
|
|
|
+
|
|
|
+ ret = trf7970a_transmit(trf, skb, len);
|
|
|
+ if (ret) {
|
|
|
+ kfree_skb(trf->rx_skb);
|
|
|
+ trf->rx_skb = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+out_err:
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev,
|
|
|
+ int type, int param)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Unsupported interface\n");
|
|
|
+
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_tg_send_cmd(struct nfc_digital_dev *ddev,
|
|
|
+ struct sk_buff *skb, u16 timeout,
|
|
|
+ nfc_digital_cmd_complete_t cb, void *arg)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Unsupported interface\n");
|
|
|
+
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_tg_listen(struct nfc_digital_dev *ddev,
|
|
|
+ u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Unsupported interface\n");
|
|
|
+
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_tg_listen_mdaa(struct nfc_digital_dev *ddev,
|
|
|
+ struct digital_tg_mdaa_params *mdaa_params,
|
|
|
+ u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Unsupported interface\n");
|
|
|
+
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
+
|
|
|
+ dev_dbg(trf->dev, "Abort process initiated\n");
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+ trf->aborting = true;
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+}
|
|
|
+
|
|
|
+static struct nfc_digital_ops trf7970a_nfc_ops = {
|
|
|
+ .in_configure_hw = trf7970a_in_configure_hw,
|
|
|
+ .in_send_cmd = trf7970a_in_send_cmd,
|
|
|
+ .tg_configure_hw = trf7970a_tg_configure_hw,
|
|
|
+ .tg_send_cmd = trf7970a_tg_send_cmd,
|
|
|
+ .tg_listen = trf7970a_tg_listen,
|
|
|
+ .tg_listen_mdaa = trf7970a_tg_listen_mdaa,
|
|
|
+ .switch_rf = trf7970a_switch_rf,
|
|
|
+ .abort_cmd = trf7970a_abort_cmd,
|
|
|
+};
|
|
|
+
|
|
|
+static int trf7970a_probe(struct spi_device *spi)
|
|
|
+{
|
|
|
+ struct device_node *np = spi->dev.of_node;
|
|
|
+ const struct spi_device_id *id = spi_get_device_id(spi);
|
|
|
+ struct trf7970a *trf;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (!np) {
|
|
|
+ dev_err(&spi->dev, "No Device Tree entry\n");
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL);
|
|
|
+ if (!trf)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ trf->state = TRF7970A_ST_OFF;
|
|
|
+ trf->dev = &spi->dev;
|
|
|
+ trf->spi = spi;
|
|
|
+ trf->quirks = id->driver_data;
|
|
|
+
|
|
|
+ spi->mode = SPI_MODE_1;
|
|
|
+ spi->bits_per_word = 8;
|
|
|
+
|
|
|
+ /* There are two enable pins - both must be present */
|
|
|
+ trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0);
|
|
|
+ if (!gpio_is_valid(trf->en_gpio)) {
|
|
|
+ dev_err(trf->dev, "No EN GPIO property\n");
|
|
|
+ return trf->en_gpio;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = devm_gpio_request_one(trf->dev, trf->en_gpio,
|
|
|
+ GPIOF_DIR_OUT | GPIOF_INIT_LOW, "EN");
|
|
|
+ if (ret) {
|
|
|
+ dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1);
|
|
|
+ if (!gpio_is_valid(trf->en2_gpio)) {
|
|
|
+ dev_err(trf->dev, "No EN2 GPIO property\n");
|
|
|
+ return trf->en2_gpio;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = devm_gpio_request_one(trf->dev, trf->en2_gpio,
|
|
|
+ GPIOF_DIR_OUT | GPIOF_INIT_LOW, "EN2");
|
|
|
+ if (ret) {
|
|
|
+ dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
|
|
|
+ trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
|
|
+ "trf7970a", trf);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ mutex_init(&trf->lock);
|
|
|
+ INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
|
|
|
+
|
|
|
+ trf->regulator = devm_regulator_get(&spi->dev, "vin");
|
|
|
+ if (IS_ERR(trf->regulator)) {
|
|
|
+ ret = PTR_ERR(trf->regulator);
|
|
|
+ dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
|
|
|
+ goto err_destroy_lock;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = regulator_enable(trf->regulator);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
|
|
|
+ goto err_destroy_lock;
|
|
|
+ }
|
|
|
+
|
|
|
+ trf->powering_up = true;
|
|
|
+
|
|
|
+ trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
|
|
|
+ TRF7970A_SUPPORTED_PROTOCOLS,
|
|
|
+ NFC_DIGITAL_DRV_CAPS_IN_CRC, TRF7970A_TX_SKB_HEADROOM,
|
|
|
+ 0);
|
|
|
+ if (!trf->ddev) {
|
|
|
+ dev_err(trf->dev, "Can't allocate NFC digital device\n");
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto err_disable_regulator;
|
|
|
+ }
|
|
|
+
|
|
|
+ nfc_digital_set_parent_dev(trf->ddev, trf->dev);
|
|
|
+ nfc_digital_set_drvdata(trf->ddev, trf);
|
|
|
+ spi_set_drvdata(spi, trf);
|
|
|
+
|
|
|
+ ret = nfc_digital_register_device(trf->ddev);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(trf->dev, "Can't register NFC digital device: %d\n",
|
|
|
+ ret);
|
|
|
+ goto err_free_ddev;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+err_free_ddev:
|
|
|
+ nfc_digital_free_device(trf->ddev);
|
|
|
+err_disable_regulator:
|
|
|
+ regulator_disable(trf->regulator);
|
|
|
+err_destroy_lock:
|
|
|
+ mutex_destroy(&trf->lock);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int trf7970a_remove(struct spi_device *spi)
|
|
|
+{
|
|
|
+ struct trf7970a *trf = spi_get_drvdata(spi);
|
|
|
+
|
|
|
+ mutex_lock(&trf->lock);
|
|
|
+
|
|
|
+ trf7970a_switch_rf_off(trf);
|
|
|
+ trf7970a_init(trf);
|
|
|
+
|
|
|
+ switch (trf->state) {
|
|
|
+ case TRF7970A_ST_WAIT_FOR_TX_FIFO:
|
|
|
+ case TRF7970A_ST_WAIT_FOR_RX_DATA:
|
|
|
+ case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
|
|
|
+ case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
|
|
|
+ trf7970a_send_err_upstream(trf, -ECANCELED);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ mutex_unlock(&trf->lock);
|
|
|
+
|
|
|
+ nfc_digital_unregister_device(trf->ddev);
|
|
|
+ nfc_digital_free_device(trf->ddev);
|
|
|
+
|
|
|
+ regulator_disable(trf->regulator);
|
|
|
+
|
|
|
+ mutex_destroy(&trf->lock);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct spi_device_id trf7970a_id_table[] = {
|
|
|
+ { "trf7970a", TRF7970A_QUIRK_IRQ_STATUS_READ_ERRATA },
|
|
|
+ { }
|
|
|
+};
|
|
|
+MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
|
|
|
+
|
|
|
+static struct spi_driver trf7970a_spi_driver = {
|
|
|
+ .probe = trf7970a_probe,
|
|
|
+ .remove = trf7970a_remove,
|
|
|
+ .id_table = trf7970a_id_table,
|
|
|
+ .driver = {
|
|
|
+ .name = "trf7970a",
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ },
|
|
|
+};
|
|
|
+
|
|
|
+module_spi_driver(trf7970a_spi_driver);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
|
|
|
+MODULE_LICENSE("GPL v2");
|
|
|
+MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");
|
John W. Linville