forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
2270 lines
62 KiB
2270 lines
62 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* TI TRF7970a RFID/NFC Transceiver Driver |
|
* |
|
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com |
|
* |
|
* Author: Erick Macias <[email protected]> |
|
* Author: Felipe Balbi <[email protected]> |
|
* Author: Mark A. Greer <[email protected]> |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/device.h> |
|
#include <linux/netdevice.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/pm_runtime.h> |
|
#include <linux/nfc.h> |
|
#include <linux/skbuff.h> |
|
#include <linux/delay.h> |
|
#include <linux/gpio/consumer.h> |
|
#include <linux/of.h> |
|
#include <linux/spi/spi.h> |
|
#include <linux/regulator/consumer.h> |
|
|
|
#include <net/nfc/nfc.h> |
|
#include <net/nfc/digital.h> |
|
|
|
/* There are 3 ways the host can communicate with the trf7970a: |
|
* parallel mode, SPI with Slave Select (SS) mode, and SPI without |
|
* SS mode. The driver only supports the two SPI modes. |
|
* |
|
* The trf7970a is very timing sensitive and the VIN, EN2, and EN |
|
* pins must asserted in that order and with specific delays in between. |
|
* The delays used in the driver were provided by TI and have been |
|
* confirmed to work with this driver. There is a bug with the current |
|
* version of the trf7970a that requires that EN2 remain low no matter |
|
* what. If it goes high, it will generate an RF field even when in |
|
* passive target mode. TI has indicated that the chip will work okay |
|
* when EN2 is left low. The 'en2-rf-quirk' device tree property |
|
* indicates that trf7970a currently being used has the erratum and |
|
* that EN2 must be kept low. |
|
* |
|
* Timeouts are implemented using the delayed workqueue kernel facility. |
|
* Timeouts are required so things don't hang when there is no response |
|
* from the trf7970a (or tag). Using this mechanism creates a race with |
|
* interrupts, however. That is, an interrupt and a timeout could occur |
|
* closely enough together that one is blocked by the mutex while the other |
|
* executes. When the timeout handler executes first and blocks the |
|
* interrupt handler, it will eventually set the state to IDLE so the |
|
* interrupt handler will check the state and exit with no harm done. |
|
* When the interrupt handler executes first and blocks the timeout handler, |
|
* the cancel_delayed_work() call will know that it didn't cancel the |
|
* work item (i.e., timeout) and will return zero. That return code is |
|
* used by the timer handler to indicate that it should ignore the timeout |
|
* once its unblocked. |
|
* |
|
* Aborting an active command isn't as simple as it seems because the only |
|
* way to abort a command that's already been sent to the tag is so turn |
|
* off power to the tag. If we do that, though, we'd have to go through |
|
* the entire anticollision procedure again but the digital layer doesn't |
|
* support that. So, if an abort is received before trf7970a_send_cmd() |
|
* has sent the command to the tag, it simply returns -ECANCELED. If the |
|
* command has already been sent to the tag, then the driver continues |
|
* normally and recieves the response data (or error) but just before |
|
* sending the data upstream, it frees the rx_skb and sends -ECANCELED |
|
* upstream instead. If the command failed, that error will be sent |
|
* upstream. |
|
* |
|
* When recieving data from a tag and the interrupt status register has |
|
* only the SRX bit set, it means that all of the data has been received |
|
* (once what's in the fifo has been read). However, depending on timing |
|
* an interrupt status with only the SRX bit set may not be recived. In |
|
* those cases, the timeout mechanism is used to wait 20 ms in case more |
|
* data arrives. After 20 ms, it is assumed that all of the data has been |
|
* received and the accumulated rx data is sent upstream. The |
|
* 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose |
|
* (i.e., it indicates that some data has been received but we're not sure |
|
* if there is more coming so a timeout in this state means all data has |
|
* been received and there isn't an error). The delay is 20 ms since delays |
|
* of ~16 ms have been observed during testing. |
|
* |
|
* When transmitting a frame larger than the FIFO size (127 bytes), the |
|
* driver will wait 20 ms for the FIFO to drain past the low-watermark |
|
* and generate an interrupt. The low-watermark set to 32 bytes so the |
|
* interrupt should fire after 127 - 32 = 95 bytes have been sent. At |
|
* the lowest possible bit rate (6.62 kbps for 15693), it will take up |
|
* to ~14.35 ms so 20 ms is used for the timeout. |
|
* |
|
* Type 2 write and sector select commands respond with a 4-bit ACK or NACK. |
|
* Having only 4 bits in the FIFO won't normally generate an interrupt so |
|
* driver enables the '4_bit_RX' bit of the Special Functions register 1 |
|
* to cause an interrupt in that case. Leaving that bit for a read command |
|
* messes up the data returned so it is only enabled when the framing is |
|
* 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. |
|
* Unfortunately, that means that the driver has to peek into tx frames |
|
* when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by |
|
* the trf7970a_per_cmd_config() routine. |
|
* |
|
* ISO/IEC 15693 frames specify whether to use single or double sub-carrier |
|
* frequencies and whether to use low or high data rates in the flags byte |
|
* of the frame. This means that the driver has to peek at all 15693 frames |
|
* to determine what speed to set the communication to. In addition, write |
|
* and lock commands use the OPTION flag to indicate that an EOF must be |
|
* sent to the tag before it will send its response. So the driver has to |
|
* examine all frames for that reason too. |
|
* |
|
* It is unclear how long to wait before sending the EOF. According to the |
|
* Note under Table 1-1 in section 1.6 of |
|
* http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least |
|
* 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long |
|
* enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain |
|
* up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to |
|
* ensure the wait is long enough before sending the EOF. This seems to work |
|
* reliably. |
|
*/ |
|
|
|
#define TRF7970A_SUPPORTED_PROTOCOLS \ |
|
(NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ |
|
NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ |
|
NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) |
|
|
|
#define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ |
|
#define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 |
|
#define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 |
|
|
|
#define TRF7970A_RX_SKB_ALLOC_SIZE 256 |
|
|
|
#define TRF7970A_FIFO_SIZE 127 |
|
|
|
/* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ |
|
#define TRF7970A_TX_MAX (4096 - 1) |
|
|
|
#define TRF7970A_WAIT_FOR_TX_IRQ 20 |
|
#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 |
|
#define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 |
|
#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 |
|
|
|
/* Guard times for various RF technologies (in us) */ |
|
#define TRF7970A_GUARD_TIME_NFCA 5000 |
|
#define TRF7970A_GUARD_TIME_NFCB 5000 |
|
#define TRF7970A_GUARD_TIME_NFCF 20000 |
|
#define TRF7970A_GUARD_TIME_15693 1000 |
|
|
|
/* Quirks */ |
|
/* Erratum: When reading IRQ Status register on trf7970a, we must issue a |
|
* read continuous command for IRQ Status and Collision Position registers. |
|
*/ |
|
#define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) |
|
#define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) |
|
|
|
/* Direct commands */ |
|
#define TRF7970A_CMD_IDLE 0x00 |
|
#define TRF7970A_CMD_SOFT_INIT 0x03 |
|
#define TRF7970A_CMD_RF_COLLISION 0x04 |
|
#define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 |
|
#define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 |
|
#define TRF7970A_CMD_FIFO_RESET 0x0f |
|
#define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 |
|
#define TRF7970A_CMD_TRANSMIT 0x11 |
|
#define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 |
|
#define TRF7970A_CMD_DELAY_TRANSMIT 0x13 |
|
#define TRF7970A_CMD_EOF 0x14 |
|
#define TRF7970A_CMD_CLOSE_SLOT 0x15 |
|
#define TRF7970A_CMD_BLOCK_RX 0x16 |
|
#define TRF7970A_CMD_ENABLE_RX 0x17 |
|
#define TRF7970A_CMD_TEST_INT_RF 0x18 |
|
#define TRF7970A_CMD_TEST_EXT_RF 0x19 |
|
#define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a |
|
|
|
/* Bits determining whether its a direct command or register R/W, |
|
* whether to use a continuous SPI transaction or not, and the actual |
|
* direct cmd opcode or register address. |
|
*/ |
|
#define TRF7970A_CMD_BIT_CTRL BIT(7) |
|
#define TRF7970A_CMD_BIT_RW BIT(6) |
|
#define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) |
|
#define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) |
|
|
|
/* Registers addresses */ |
|
#define TRF7970A_CHIP_STATUS_CTRL 0x00 |
|
#define TRF7970A_ISO_CTRL 0x01 |
|
#define TRF7970A_ISO14443B_TX_OPTIONS 0x02 |
|
#define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 |
|
#define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 |
|
#define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 |
|
#define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 |
|
#define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 |
|
#define TRF7970A_RX_WAIT_TIME 0x08 |
|
#define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 |
|
#define TRF7970A_RX_SPECIAL_SETTINGS 0x0a |
|
#define TRF7970A_REG_IO_CTRL 0x0b |
|
#define TRF7970A_IRQ_STATUS 0x0c |
|
#define TRF7970A_COLLISION_IRQ_MASK 0x0d |
|
#define TRF7970A_COLLISION_POSITION 0x0e |
|
#define TRF7970A_RSSI_OSC_STATUS 0x0f |
|
#define TRF7970A_SPECIAL_FCN_REG1 0x10 |
|
#define TRF7970A_SPECIAL_FCN_REG2 0x11 |
|
#define TRF7970A_RAM1 0x12 |
|
#define TRF7970A_RAM2 0x13 |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 |
|
#define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 |
|
#define TRF7970A_NFCID1 0x17 |
|
#define TRF7970A_NFC_TARGET_LEVEL 0x18 |
|
#define TRF79070A_NFC_TARGET_PROTOCOL 0x19 |
|
#define TRF7970A_TEST_REGISTER1 0x1a |
|
#define TRF7970A_TEST_REGISTER2 0x1b |
|
#define TRF7970A_FIFO_STATUS 0x1c |
|
#define TRF7970A_TX_LENGTH_BYTE1 0x1d |
|
#define TRF7970A_TX_LENGTH_BYTE2 0x1e |
|
#define TRF7970A_FIFO_IO_REGISTER 0x1f |
|
|
|
/* Chip Status Control Register Bits */ |
|
#define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) |
|
#define TRF7970A_CHIP_STATUS_REC_ON BIT(1) |
|
#define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) |
|
#define TRF7970A_CHIP_STATUS_PM_ON BIT(3) |
|
#define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) |
|
#define TRF7970A_CHIP_STATUS_RF_ON BIT(5) |
|
#define TRF7970A_CHIP_STATUS_DIRECT BIT(6) |
|
#define TRF7970A_CHIP_STATUS_STBY BIT(7) |
|
|
|
/* ISO Control Register Bits */ |
|
#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 |
|
#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 |
|
#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 |
|
#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 |
|
#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 |
|
#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 |
|
#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 |
|
#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 |
|
#define TRF7970A_ISO_CTRL_14443A_106 0x08 |
|
#define TRF7970A_ISO_CTRL_14443A_212 0x09 |
|
#define TRF7970A_ISO_CTRL_14443A_424 0x0a |
|
#define TRF7970A_ISO_CTRL_14443A_848 0x0b |
|
#define TRF7970A_ISO_CTRL_14443B_106 0x0c |
|
#define TRF7970A_ISO_CTRL_14443B_212 0x0d |
|
#define TRF7970A_ISO_CTRL_14443B_424 0x0e |
|
#define TRF7970A_ISO_CTRL_14443B_848 0x0f |
|
#define TRF7970A_ISO_CTRL_FELICA_212 0x1a |
|
#define TRF7970A_ISO_CTRL_FELICA_424 0x1b |
|
#define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 |
|
#define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 |
|
#define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 |
|
#define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 |
|
#define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 |
|
#define TRF7970A_ISO_CTRL_NFC_CE BIT(2) |
|
#define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) |
|
#define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) |
|
#define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) |
|
#define TRF7970A_ISO_CTRL_RFID BIT(5) |
|
#define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) |
|
#define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ |
|
|
|
#define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f |
|
|
|
/* Modulator and SYS_CLK Control Register Bits */ |
|
#define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) |
|
#define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) |
|
#define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) |
|
#define TRF7970A_MODULATOR_EN_ANA BIT(3) |
|
#define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) |
|
#define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) |
|
#define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) |
|
#define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) |
|
#define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) |
|
#define TRF7970A_MODULATOR_EN_OOK BIT(6) |
|
#define TRF7970A_MODULATOR_27MHZ BIT(7) |
|
|
|
#define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) |
|
#define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) |
|
|
|
#define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) |
|
#define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) |
|
#define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) |
|
#define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) |
|
|
|
/* IRQ Status Register Bits */ |
|
#define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ |
|
#define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) |
|
#define TRF7970A_IRQ_STATUS_COL BIT(1) |
|
#define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) |
|
#define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) |
|
#define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) |
|
#define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) |
|
#define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) |
|
#define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) |
|
#define TRF7970A_IRQ_STATUS_FIFO BIT(5) |
|
#define TRF7970A_IRQ_STATUS_SRX BIT(6) |
|
#define TRF7970A_IRQ_STATUS_TX BIT(7) |
|
|
|
#define TRF7970A_IRQ_STATUS_ERROR \ |
|
(TRF7970A_IRQ_STATUS_COL | \ |
|
TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ |
|
TRF7970A_IRQ_STATUS_PARITY_ERROR | \ |
|
TRF7970A_IRQ_STATUS_CRC_ERROR) |
|
|
|
#define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0)) |
|
#define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3)) |
|
#define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6) |
|
|
|
#define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) |
|
#define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) |
|
#define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) |
|
#define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) |
|
#define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) |
|
#define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) |
|
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 |
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 |
|
|
|
#define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) |
|
#define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) |
|
|
|
#define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) |
|
#define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) |
|
#define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) |
|
#define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) |
|
#define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) |
|
#define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) |
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) |
|
#define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) |
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_106A \ |
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) |
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_106B \ |
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) |
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_212F \ |
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) |
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_424F \ |
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ |
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) |
|
|
|
#define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) |
|
|
|
/* NFC (ISO/IEC 14443A) Type 2 Tag commands */ |
|
#define NFC_T2T_CMD_READ 0x30 |
|
|
|
/* ISO 15693 commands codes */ |
|
#define ISO15693_CMD_INVENTORY 0x01 |
|
#define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 |
|
#define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 |
|
#define ISO15693_CMD_LOCK_BLOCK 0x22 |
|
#define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 |
|
#define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 |
|
#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_PWR_OFF, |
|
TRF7970A_ST_RF_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_LISTENING, |
|
TRF7970A_ST_LISTENING_MD, |
|
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 is_initiator; |
|
bool aborting; |
|
struct sk_buff *tx_skb; |
|
struct sk_buff *rx_skb; |
|
nfc_digital_cmd_complete_t cb; |
|
void *cb_arg; |
|
u8 chip_status_ctrl; |
|
u8 iso_ctrl; |
|
u8 iso_ctrl_tech; |
|
u8 modulator_sys_clk_ctrl; |
|
u8 special_fcn_reg1; |
|
u8 io_ctrl; |
|
unsigned int guard_time; |
|
int technology; |
|
int framing; |
|
u8 md_rf_tech; |
|
u8 tx_cmd; |
|
bool issue_eof; |
|
struct gpio_desc *en_gpiod; |
|
struct gpio_desc *en2_gpiod; |
|
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; |
|
struct spi_transfer t[2]; |
|
struct spi_message m; |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); |
|
|
|
spi_message_init(&m); |
|
|
|
memset(&t, 0, sizeof(t)); |
|
|
|
t[0].tx_buf = &addr; |
|
t[0].len = sizeof(addr); |
|
spi_message_add_tail(&t[0], &m); |
|
|
|
t[1].rx_buf = buf; |
|
t[1].len = len; |
|
spi_message_add_tail(&t[1], &m); |
|
|
|
ret = spi_sync(trf->spi, &m); |
|
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) { |
|
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 int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) |
|
{ |
|
int ret; |
|
u8 buf[2]; |
|
u8 addr; |
|
|
|
addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | |
|
TRF7970A_CMD_BIT_CONTINUOUS; |
|
|
|
ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); |
|
if (ret) |
|
dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", |
|
__func__, ret); |
|
else |
|
*target_proto = buf[0]; |
|
|
|
return ret; |
|
} |
|
|
|
static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) |
|
{ |
|
int ret; |
|
u8 target_proto, tech; |
|
|
|
ret = trf7970a_read_target_proto(trf, &target_proto); |
|
if (ret) |
|
return ret; |
|
|
|
switch (target_proto) { |
|
case TRF79070A_NFC_TARGET_PROTOCOL_106A: |
|
tech = NFC_DIGITAL_RF_TECH_106A; |
|
break; |
|
case TRF79070A_NFC_TARGET_PROTOCOL_106B: |
|
tech = NFC_DIGITAL_RF_TECH_106B; |
|
break; |
|
case TRF79070A_NFC_TARGET_PROTOCOL_212F: |
|
tech = NFC_DIGITAL_RF_TECH_212F; |
|
break; |
|
case TRF79070A_NFC_TARGET_PROTOCOL_424F: |
|
tech = NFC_DIGITAL_RF_TECH_424F; |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", |
|
__func__, target_proto); |
|
return -EIO; |
|
} |
|
|
|
*rf_tech = tech; |
|
|
|
return ret; |
|
} |
|
|
|
static void trf7970a_send_upstream(struct trf7970a *trf) |
|
{ |
|
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); |
|
|
|
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); |
|
|
|
cancel_delayed_work(&trf->timeout_work); |
|
|
|
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, u8 *prefix, |
|
unsigned int prefix_len) |
|
{ |
|
struct spi_transfer t[2]; |
|
struct spi_message m; |
|
unsigned int timeout; |
|
int ret; |
|
|
|
print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, |
|
16, 1, skb->data, len, false); |
|
|
|
spi_message_init(&m); |
|
|
|
memset(&t, 0, sizeof(t)); |
|
|
|
t[0].tx_buf = prefix; |
|
t[0].len = prefix_len; |
|
spi_message_add_tail(&t[0], &m); |
|
|
|
t[1].tx_buf = skb->data; |
|
t[1].len = len; |
|
spi_message_add_tail(&t[1], &m); |
|
|
|
ret = spi_sync(trf->spi, &m); |
|
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; |
|
|
|
if (!trf->timeout) |
|
timeout = TRF7970A_WAIT_FOR_TX_IRQ; |
|
else |
|
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; |
|
u8 prefix; |
|
|
|
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); |
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
|
|
|
/* Calculate how much more data can be written to the fifo */ |
|
len = TRF7970A_FIFO_SIZE - fifo_bytes; |
|
if (!len) { |
|
schedule_delayed_work(&trf->timeout_work, |
|
msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); |
|
return; |
|
} |
|
|
|
len = min(skb->len, len); |
|
|
|
prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; |
|
|
|
ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); |
|
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); |
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
|
|
|
if (!fifo_bytes) |
|
goto no_rx_data; |
|
|
|
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; |
|
|
|
ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); |
|
if (ret) { |
|
trf7970a_send_err_upstream(trf, ret); |
|
return; |
|
} |
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
|
|
|
/* If there are bytes in the FIFO, set status to '0' so |
|
* the if stmt below doesn't fire and the driver will wait |
|
* for the trf7970a to generate another RX interrupt. |
|
*/ |
|
if (fifo_bytes) |
|
status = 0; |
|
} |
|
|
|
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, fifo_bytes, iso_ctrl; |
|
|
|
mutex_lock(&trf->lock); |
|
|
|
if (trf->state == TRF7970A_ST_RF_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 initiator and getting interrupts caused by RF noise, |
|
* turn off the receiver to avoid unnecessary interrupts. |
|
* It will be turned back on in trf7970a_send_cmd() when |
|
* the next command is issued. |
|
*/ |
|
if (trf->is_initiator && (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_FIFO) { |
|
ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, |
|
&fifo_bytes); |
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
|
|
|
if (ret) |
|
trf7970a_send_err_upstream(trf, ret); |
|
else if (!fifo_bytes) |
|
trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
|
} else if ((status == TRF7970A_IRQ_STATUS_TX) || |
|
(!trf->is_initiator && |
|
(status == (TRF7970A_IRQ_STATUS_TX | |
|
TRF7970A_IRQ_STATUS_NFC_RF)))) { |
|
trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
|
|
|
if (!trf->timeout) { |
|
trf->ignore_timeout = |
|
!cancel_delayed_work(&trf->timeout_work); |
|
trf->rx_skb = ERR_PTR(0); |
|
trf7970a_send_upstream(trf); |
|
break; |
|
} |
|
|
|
if (trf->is_initiator) |
|
break; |
|
|
|
iso_ctrl = trf->iso_ctrl; |
|
|
|
switch (trf->framing) { |
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; |
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
|
trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ |
|
break; |
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
|
trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ |
|
break; |
|
case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: |
|
ret = trf7970a_write(trf, |
|
TRF7970A_SPECIAL_FCN_REG1, |
|
TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); |
|
if (ret) |
|
goto err_unlock_exit; |
|
|
|
trf->special_fcn_reg1 = |
|
TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
if (iso_ctrl != trf->iso_ctrl) { |
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, |
|
iso_ctrl); |
|
if (ret) |
|
goto err_unlock_exit; |
|
|
|
trf->iso_ctrl = iso_ctrl; |
|
} |
|
} else { |
|
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; |
|
case TRF7970A_ST_LISTENING: |
|
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_NFC_RF)) { |
|
trf7970a_send_err_upstream(trf, -EIO); |
|
} |
|
break; |
|
case TRF7970A_ST_LISTENING_MD: |
|
if (status & TRF7970A_IRQ_STATUS_SRX) { |
|
trf->ignore_timeout = |
|
!cancel_delayed_work(&trf->timeout_work); |
|
|
|
ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); |
|
if (ret) { |
|
trf7970a_send_err_upstream(trf, ret); |
|
} else { |
|
trf->state = TRF7970A_ST_LISTENING; |
|
trf7970a_drain_fifo(trf, status); |
|
} |
|
} else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { |
|
trf7970a_send_err_upstream(trf, -EIO); |
|
} |
|
break; |
|
default: |
|
dev_err(trf->dev, "%s - Driver in invalid state: %d\n", |
|
__func__, trf->state); |
|
} |
|
|
|
err_unlock_exit: |
|
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_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); |
|
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_REG_IO_CTRL, |
|
trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
|
if (ret) |
|
goto err_out; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); |
|
if (ret) |
|
goto err_out; |
|
|
|
usleep_range(1000, 2000); |
|
|
|
trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
|
trf->modulator_sys_clk_ctrl); |
|
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; |
|
|
|
trf->iso_ctrl = 0xff; |
|
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) |
|
{ |
|
if ((trf->state == TRF7970A_ST_PWR_OFF) || |
|
(trf->state == TRF7970A_ST_RF_OFF)) |
|
return; |
|
|
|
dev_dbg(trf->dev, "Switching rf off\n"); |
|
|
|
trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
|
|
|
trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); |
|
|
|
trf->aborting = false; |
|
trf->state = TRF7970A_ST_RF_OFF; |
|
|
|
pm_runtime_mark_last_busy(trf->dev); |
|
pm_runtime_put_autosuspend(trf->dev); |
|
} |
|
|
|
static int trf7970a_switch_rf_on(struct trf7970a *trf) |
|
{ |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "Switching rf on\n"); |
|
|
|
pm_runtime_get_sync(trf->dev); |
|
|
|
if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ |
|
dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, |
|
trf->state); |
|
return -EINVAL; |
|
} |
|
|
|
ret = trf7970a_init(trf); |
|
if (ret) { |
|
dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); |
|
return ret; |
|
} |
|
|
|
trf->state = TRF7970A_ST_IDLE; |
|
|
|
return 0; |
|
} |
|
|
|
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_PWR_OFF: |
|
case TRF7970A_ST_RF_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); |
|
ret = -EINVAL; |
|
} |
|
} else { |
|
switch (trf->state) { |
|
case TRF7970A_ST_PWR_OFF: |
|
case TRF7970A_ST_RF_OFF: |
|
break; |
|
default: |
|
dev_err(trf->dev, "%s - Invalid request: %d %d\n", |
|
__func__, trf->state, on); |
|
ret = -EINVAL; |
|
fallthrough; |
|
case TRF7970A_ST_IDLE: |
|
case TRF7970A_ST_IDLE_RX_BLOCKED: |
|
case TRF7970A_ST_WAIT_FOR_RX_DATA: |
|
case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: |
|
trf7970a_switch_rf_off(trf); |
|
} |
|
} |
|
|
|
mutex_unlock(&trf->lock); |
|
return ret; |
|
} |
|
|
|
static int trf7970a_in_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_tech = TRF7970A_ISO_CTRL_14443A_106; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_OOK; |
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCA; |
|
break; |
|
case NFC_DIGITAL_RF_TECH_106B: |
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_ASK10; |
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCB; |
|
break; |
|
case NFC_DIGITAL_RF_TECH_212F: |
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_ASK10; |
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
|
break; |
|
case NFC_DIGITAL_RF_TECH_424F: |
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_ASK10; |
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
|
break; |
|
case NFC_DIGITAL_RF_TECH_ISO15693: |
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_OOK; |
|
trf->guard_time = TRF7970A_GUARD_TIME_15693; |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); |
|
return -EINVAL; |
|
} |
|
|
|
trf->technology = tech; |
|
|
|
/* If in initiator mode and not changing the RF tech due to a |
|
* PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from |
|
* trf7970a_init()), clear the NFC Target Detection Level register |
|
* due to erratum. |
|
*/ |
|
if (trf->iso_ctrl == 0xff) |
|
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); |
|
|
|
return ret; |
|
} |
|
|
|
static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) |
|
{ |
|
int ret; |
|
u8 rssi; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
|
trf->chip_status_ctrl | |
|
TRF7970A_CHIP_STATUS_REC_ON); |
|
if (ret) |
|
return ret; |
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); |
|
if (ret) |
|
return ret; |
|
|
|
usleep_range(50, 60); |
|
|
|
ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); |
|
if (ret) |
|
return ret; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
|
trf->chip_status_ctrl); |
|
if (ret) |
|
return ret; |
|
|
|
if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) |
|
*is_rf_field = true; |
|
else |
|
*is_rf_field = false; |
|
|
|
return 0; |
|
} |
|
|
|
static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) |
|
{ |
|
u8 iso_ctrl = trf->iso_ctrl_tech; |
|
bool is_rf_field = false; |
|
int ret; |
|
|
|
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; |
|
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_NFCB: |
|
case NFC_DIGITAL_FRAMING_NFCB_T4T: |
|
case NFC_DIGITAL_FRAMING_NFCF: |
|
case NFC_DIGITAL_FRAMING_NFCF_T3T: |
|
case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: |
|
case NFC_DIGITAL_FRAMING_ISO15693_T5T: |
|
case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: |
|
case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
|
break; |
|
case NFC_DIGITAL_FRAMING_NFCA_T2T: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); |
|
return -EINVAL; |
|
} |
|
|
|
trf->framing = framing; |
|
|
|
if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
|
ret = trf7970a_is_rf_field(trf, &is_rf_field); |
|
if (ret) |
|
return ret; |
|
|
|
if (is_rf_field) |
|
return -EBUSY; |
|
} |
|
|
|
if (iso_ctrl != trf->iso_ctrl) { |
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); |
|
if (ret) |
|
return ret; |
|
|
|
trf->iso_ctrl = iso_ctrl; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
|
trf->modulator_sys_clk_ctrl); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
|
trf->chip_status_ctrl | |
|
TRF7970A_CHIP_STATUS_RF_ON); |
|
if (ret) |
|
return ret; |
|
|
|
trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; |
|
|
|
usleep_range(trf->guard_time, trf->guard_time + 1000); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
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; |
|
|
|
dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); |
|
|
|
mutex_lock(&trf->lock); |
|
|
|
trf->is_initiator = true; |
|
|
|
if ((trf->state == TRF7970A_ST_PWR_OFF) || |
|
(trf->state == TRF7970A_ST_RF_OFF)) { |
|
ret = trf7970a_switch_rf_on(trf); |
|
if (ret) |
|
goto err_unlock; |
|
} |
|
|
|
switch (type) { |
|
case NFC_DIGITAL_CONFIG_RF_TECH: |
|
ret = trf7970a_in_config_rf_tech(trf, param); |
|
break; |
|
case NFC_DIGITAL_CONFIG_FRAMING: |
|
ret = trf7970a_in_config_framing(trf, param); |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "Unknown type: %d\n", type); |
|
ret = -EINVAL; |
|
} |
|
|
|
err_unlock: |
|
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; |
|
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_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); |
|
u8 prefix[5]; |
|
unsigned int len; |
|
int ret; |
|
u8 status; |
|
|
|
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; |
|
} |
|
|
|
if (timeout) { |
|
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; |
|
} |
|
|
|
if (trf->is_initiator) { |
|
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; |
|
|
|
/* 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. |
|
* That totals 5 bytes. |
|
*/ |
|
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); |
|
|
|
/* Clear possible spurious interrupt */ |
|
ret = trf7970a_read_irqstatus(trf, &status); |
|
if (ret) |
|
goto out_err; |
|
|
|
ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); |
|
if (ret) { |
|
kfree_skb(trf->rx_skb); |
|
trf->rx_skb = NULL; |
|
} |
|
|
|
out_err: |
|
mutex_unlock(&trf->lock); |
|
return ret; |
|
} |
|
|
|
static int trf7970a_tg_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_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | |
|
TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_OOK; |
|
break; |
|
case NFC_DIGITAL_RF_TECH_212F: |
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | |
|
TRF7970A_ISO_CTRL_NFC_NFCF_212; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_ASK10; |
|
break; |
|
case NFC_DIGITAL_RF_TECH_424F: |
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | |
|
TRF7970A_ISO_CTRL_NFC_NFCF_424; |
|
trf->modulator_sys_clk_ctrl = |
|
(trf->modulator_sys_clk_ctrl & 0xf8) | |
|
TRF7970A_MODULATOR_DEPTH_ASK10; |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); |
|
return -EINVAL; |
|
} |
|
|
|
trf->technology = tech; |
|
|
|
/* Normally we write the ISO_CTRL register in |
|
* trf7970a_tg_config_framing() because the framing can change |
|
* the value written. However, when sending a PSL RES, |
|
* digital_tg_send_psl_res_complete() doesn't call |
|
* trf7970a_tg_config_framing() so we must write the register |
|
* here. |
|
*/ |
|
if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && |
|
(trf->iso_ctrl_tech != trf->iso_ctrl)) { |
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, |
|
trf->iso_ctrl_tech); |
|
|
|
trf->iso_ctrl = trf->iso_ctrl_tech; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* Since this is a target routine, several of the framing calls are |
|
* made between receiving the request and sending the response so they |
|
* should take effect until after the response is sent. This is accomplished |
|
* by skipping the ISO_CTRL register write here and doing it in the interrupt |
|
* handler. |
|
*/ |
|
static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) |
|
{ |
|
u8 iso_ctrl = trf->iso_ctrl_tech; |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "framing: %d\n", framing); |
|
|
|
switch (framing) { |
|
case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; |
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
|
break; |
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD: |
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: |
|
case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: |
|
/* These ones are applied in the interrupt handler */ |
|
iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ |
|
break; |
|
case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
|
break; |
|
case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: |
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); |
|
return -EINVAL; |
|
} |
|
|
|
trf->framing = framing; |
|
|
|
if (iso_ctrl != trf->iso_ctrl) { |
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); |
|
if (ret) |
|
return ret; |
|
|
|
trf->iso_ctrl = iso_ctrl; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
|
trf->modulator_sys_clk_ctrl); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
|
trf->chip_status_ctrl | |
|
TRF7970A_CHIP_STATUS_RF_ON); |
|
if (ret) |
|
return ret; |
|
|
|
trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, |
|
int param) |
|
{ |
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev); |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); |
|
|
|
mutex_lock(&trf->lock); |
|
|
|
trf->is_initiator = false; |
|
|
|
if ((trf->state == TRF7970A_ST_PWR_OFF) || |
|
(trf->state == TRF7970A_ST_RF_OFF)) { |
|
ret = trf7970a_switch_rf_on(trf); |
|
if (ret) |
|
goto err_unlock; |
|
} |
|
|
|
switch (type) { |
|
case NFC_DIGITAL_CONFIG_RF_TECH: |
|
ret = trf7970a_tg_config_rf_tech(trf, param); |
|
break; |
|
case NFC_DIGITAL_CONFIG_FRAMING: |
|
ret = trf7970a_tg_config_framing(trf, param); |
|
break; |
|
default: |
|
dev_dbg(trf->dev, "Unknown type: %d\n", type); |
|
ret = -EINVAL; |
|
} |
|
|
|
err_unlock: |
|
mutex_unlock(&trf->lock); |
|
return ret; |
|
} |
|
|
|
static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
|
nfc_digital_cmd_complete_t cb, void *arg, |
|
bool mode_detect) |
|
{ |
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev); |
|
int ret; |
|
|
|
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; |
|
} |
|
|
|
ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, |
|
TRF7970A_RX_SPECIAL_SETTINGS_HBT | |
|
TRF7970A_RX_SPECIAL_SETTINGS_M848 | |
|
TRF7970A_RX_SPECIAL_SETTINGS_C424 | |
|
TRF7970A_RX_SPECIAL_SETTINGS_C212); |
|
if (ret) |
|
goto out_err; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, |
|
trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
|
if (ret) |
|
goto out_err; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, |
|
TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); |
|
if (ret) |
|
goto out_err; |
|
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, |
|
TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); |
|
if (ret) |
|
goto out_err; |
|
|
|
trf->ddev = ddev; |
|
trf->cb = cb; |
|
trf->cb_arg = arg; |
|
trf->timeout = timeout; |
|
trf->ignore_timeout = false; |
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); |
|
if (ret) |
|
goto out_err; |
|
|
|
trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : |
|
TRF7970A_ST_LISTENING; |
|
|
|
schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); |
|
|
|
out_err: |
|
mutex_unlock(&trf->lock); |
|
return ret; |
|
} |
|
|
|
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, "Listen - state: %d, timeout: %d ms\n", |
|
trf->state, timeout); |
|
|
|
return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); |
|
} |
|
|
|
static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, |
|
u16 timeout, nfc_digital_cmd_complete_t cb, |
|
void *arg) |
|
{ |
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev); |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", |
|
trf->state, timeout); |
|
|
|
ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, |
|
NFC_DIGITAL_RF_TECH_106A); |
|
if (ret) |
|
return ret; |
|
|
|
ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
|
NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); |
|
if (ret) |
|
return ret; |
|
|
|
return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); |
|
} |
|
|
|
static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) |
|
{ |
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev); |
|
|
|
dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", |
|
trf->state, trf->md_rf_tech); |
|
|
|
*rf_tech = trf->md_rf_tech; |
|
|
|
return 0; |
|
} |
|
|
|
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); |
|
|
|
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: |
|
trf->aborting = true; |
|
break; |
|
case TRF7970A_ST_LISTENING: |
|
trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); |
|
trf7970a_send_err_upstream(trf, -ECANCELED); |
|
dev_dbg(trf->dev, "Abort process complete\n"); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
mutex_unlock(&trf->lock); |
|
} |
|
|
|
static struct nfc_digital_ops trf7970a_nfc_ops = { |
|
.in_configure_hw = trf7970a_in_configure_hw, |
|
.in_send_cmd = trf7970a_send_cmd, |
|
.tg_configure_hw = trf7970a_tg_configure_hw, |
|
.tg_send_cmd = trf7970a_send_cmd, |
|
.tg_listen = trf7970a_tg_listen, |
|
.tg_listen_md = trf7970a_tg_listen_md, |
|
.tg_get_rf_tech = trf7970a_tg_get_rf_tech, |
|
.switch_rf = trf7970a_switch_rf, |
|
.abort_cmd = trf7970a_abort_cmd, |
|
}; |
|
|
|
static int trf7970a_power_up(struct trf7970a *trf) |
|
{ |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); |
|
|
|
if (trf->state != TRF7970A_ST_PWR_OFF) |
|
return 0; |
|
|
|
ret = regulator_enable(trf->regulator); |
|
if (ret) { |
|
dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); |
|
return ret; |
|
} |
|
|
|
usleep_range(5000, 6000); |
|
|
|
if (trf->en2_gpiod && |
|
!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { |
|
gpiod_set_value_cansleep(trf->en2_gpiod, 1); |
|
usleep_range(1000, 2000); |
|
} |
|
|
|
gpiod_set_value_cansleep(trf->en_gpiod, 1); |
|
|
|
usleep_range(20000, 21000); |
|
|
|
trf->state = TRF7970A_ST_RF_OFF; |
|
|
|
return 0; |
|
} |
|
|
|
static int trf7970a_power_down(struct trf7970a *trf) |
|
{ |
|
int ret; |
|
|
|
dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); |
|
|
|
if (trf->state == TRF7970A_ST_PWR_OFF) |
|
return 0; |
|
|
|
if (trf->state != TRF7970A_ST_RF_OFF) { |
|
dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", |
|
trf->state); |
|
return -EBUSY; |
|
} |
|
|
|
gpiod_set_value_cansleep(trf->en_gpiod, 0); |
|
|
|
if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) |
|
gpiod_set_value_cansleep(trf->en2_gpiod, 0); |
|
|
|
ret = regulator_disable(trf->regulator); |
|
if (ret) |
|
dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, |
|
ret); |
|
|
|
trf->state = TRF7970A_ST_PWR_OFF; |
|
|
|
return ret; |
|
} |
|
|
|
static int trf7970a_startup(struct trf7970a *trf) |
|
{ |
|
int ret; |
|
|
|
ret = trf7970a_power_up(trf); |
|
if (ret) |
|
return ret; |
|
|
|
pm_runtime_set_active(trf->dev); |
|
pm_runtime_enable(trf->dev); |
|
pm_runtime_mark_last_busy(trf->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static void trf7970a_shutdown(struct trf7970a *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: |
|
case TRF7970A_ST_LISTENING: |
|
trf7970a_send_err_upstream(trf, -ECANCELED); |
|
fallthrough; |
|
case TRF7970A_ST_IDLE: |
|
case TRF7970A_ST_IDLE_RX_BLOCKED: |
|
trf7970a_switch_rf_off(trf); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
pm_runtime_disable(trf->dev); |
|
pm_runtime_set_suspended(trf->dev); |
|
|
|
trf7970a_power_down(trf); |
|
} |
|
|
|
static int trf7970a_get_autosuspend_delay(struct device_node *np) |
|
{ |
|
int autosuspend_delay, ret; |
|
|
|
ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); |
|
if (ret) |
|
autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; |
|
|
|
return autosuspend_delay; |
|
} |
|
|
|
static int trf7970a_probe(struct spi_device *spi) |
|
{ |
|
struct device_node *np = spi->dev.of_node; |
|
struct trf7970a *trf; |
|
int uvolts, autosuspend_delay, ret; |
|
u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; |
|
|
|
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_PWR_OFF; |
|
trf->dev = &spi->dev; |
|
trf->spi = spi; |
|
|
|
spi->mode = SPI_MODE_1; |
|
spi->bits_per_word = 8; |
|
|
|
ret = spi_setup(spi); |
|
if (ret < 0) { |
|
dev_err(trf->dev, "Can't set up SPI Communication\n"); |
|
return ret; |
|
} |
|
|
|
if (of_property_read_bool(np, "irq-status-read-quirk")) |
|
trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; |
|
|
|
/* There are two enable pins - only EN must be present in the DT */ |
|
trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0, |
|
GPIOD_OUT_LOW); |
|
if (IS_ERR(trf->en_gpiod)) { |
|
dev_err(trf->dev, "No EN GPIO property\n"); |
|
return PTR_ERR(trf->en_gpiod); |
|
} |
|
|
|
trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1, |
|
GPIOD_OUT_LOW); |
|
if (!trf->en2_gpiod) { |
|
dev_info(trf->dev, "No EN2 GPIO property\n"); |
|
} else if (IS_ERR(trf->en2_gpiod)) { |
|
dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n", |
|
PTR_ERR(trf->en2_gpiod)); |
|
return PTR_ERR(trf->en2_gpiod); |
|
} else if (of_property_read_bool(np, "en2-rf-quirk")) { |
|
trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; |
|
} |
|
|
|
of_property_read_u32(np, "clock-frequency", &clk_freq); |
|
if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && |
|
(clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { |
|
dev_err(trf->dev, |
|
"clock-frequency (%u Hz) unsupported\n", clk_freq); |
|
return -EINVAL; |
|
} |
|
|
|
if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) { |
|
trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; |
|
dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n"); |
|
} else { |
|
trf->modulator_sys_clk_ctrl = 0; |
|
} |
|
|
|
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; |
|
} |
|
|
|
uvolts = regulator_get_voltage(trf->regulator); |
|
if (uvolts > 4000000) |
|
trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; |
|
|
|
trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); |
|
if (IS_ERR(trf->regulator)) { |
|
ret = PTR_ERR(trf->regulator); |
|
dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); |
|
goto err_destroy_lock; |
|
} |
|
|
|
ret = regulator_enable(trf->regulator); |
|
if (ret) { |
|
dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); |
|
goto err_destroy_lock; |
|
} |
|
|
|
if (regulator_get_voltage(trf->regulator) == 1800000) { |
|
trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; |
|
dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); |
|
} |
|
|
|
trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, |
|
TRF7970A_SUPPORTED_PROTOCOLS, |
|
NFC_DIGITAL_DRV_CAPS_IN_CRC | |
|
NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, |
|
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); |
|
|
|
autosuspend_delay = trf7970a_get_autosuspend_delay(np); |
|
|
|
pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); |
|
pm_runtime_use_autosuspend(trf->dev); |
|
|
|
ret = trf7970a_startup(trf); |
|
if (ret) |
|
goto err_free_ddev; |
|
|
|
ret = nfc_digital_register_device(trf->ddev); |
|
if (ret) { |
|
dev_err(trf->dev, "Can't register NFC digital device: %d\n", |
|
ret); |
|
goto err_shutdown; |
|
} |
|
|
|
return 0; |
|
|
|
err_shutdown: |
|
trf7970a_shutdown(trf); |
|
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_shutdown(trf); |
|
|
|
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; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int trf7970a_suspend(struct device *dev) |
|
{ |
|
struct spi_device *spi = to_spi_device(dev); |
|
struct trf7970a *trf = spi_get_drvdata(spi); |
|
|
|
dev_dbg(dev, "Suspend\n"); |
|
|
|
mutex_lock(&trf->lock); |
|
|
|
trf7970a_shutdown(trf); |
|
|
|
mutex_unlock(&trf->lock); |
|
|
|
return 0; |
|
} |
|
|
|
static int trf7970a_resume(struct device *dev) |
|
{ |
|
struct spi_device *spi = to_spi_device(dev); |
|
struct trf7970a *trf = spi_get_drvdata(spi); |
|
int ret; |
|
|
|
dev_dbg(dev, "Resume\n"); |
|
|
|
mutex_lock(&trf->lock); |
|
|
|
ret = trf7970a_startup(trf); |
|
|
|
mutex_unlock(&trf->lock); |
|
|
|
return ret; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_PM |
|
static int trf7970a_pm_runtime_suspend(struct device *dev) |
|
{ |
|
struct spi_device *spi = to_spi_device(dev); |
|
struct trf7970a *trf = spi_get_drvdata(spi); |
|
int ret; |
|
|
|
dev_dbg(dev, "Runtime suspend\n"); |
|
|
|
mutex_lock(&trf->lock); |
|
|
|
ret = trf7970a_power_down(trf); |
|
|
|
mutex_unlock(&trf->lock); |
|
|
|
return ret; |
|
} |
|
|
|
static int trf7970a_pm_runtime_resume(struct device *dev) |
|
{ |
|
struct spi_device *spi = to_spi_device(dev); |
|
struct trf7970a *trf = spi_get_drvdata(spi); |
|
int ret; |
|
|
|
dev_dbg(dev, "Runtime resume\n"); |
|
|
|
ret = trf7970a_power_up(trf); |
|
if (!ret) |
|
pm_runtime_mark_last_busy(dev); |
|
|
|
return ret; |
|
} |
|
#endif |
|
|
|
static const struct dev_pm_ops trf7970a_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) |
|
SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, |
|
trf7970a_pm_runtime_resume, NULL) |
|
}; |
|
|
|
static const struct of_device_id trf7970a_of_match[] = { |
|
{.compatible = "ti,trf7970a",}, |
|
{}, |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(of, trf7970a_of_match); |
|
|
|
static const struct spi_device_id trf7970a_id_table[] = { |
|
{"trf7970a", 0}, |
|
{} |
|
}; |
|
|
|
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", |
|
.of_match_table = of_match_ptr(trf7970a_of_match), |
|
.pm = &trf7970a_pm_ops, |
|
}, |
|
}; |
|
|
|
module_spi_driver(trf7970a_spi_driver); |
|
|
|
MODULE_AUTHOR("Mark A. Greer <[email protected]>"); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");
|
|
|