| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Mark A. Greer | 8490 | 96.48% | 55 | 78.57% |
| Geoff Lansberry | 252 | 2.86% | 4 | 5.71% |
| Javier Martinez Canillas | 28 | 0.32% | 1 | 1.43% |
| Krzysztof Kozlowski | 9 | 0.10% | 2 | 2.86% |
| Guan Ben Guan | 7 | 0.08% | 1 | 1.43% |
| Geliang Tang | 4 | 0.05% | 1 | 1.43% |
| Gustavo A. R. Silva | 4 | 0.05% | 1 | 1.43% |
| Thomas Gleixner | 2 | 0.02% | 1 | 1.43% |
| Rafael J. Wysocki | 1 | 0.01% | 1 | 1.43% |
| Uwe Kleine-König | 1 | 0.01% | 1 | 1.43% |
| wengjianfeng | 1 | 0.01% | 1 | 1.43% |
| Colin Ian King | 1 | 0.01% | 1 | 1.43% |
| Total | 8800 | 70 |
// 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 <emacias@ti.com> * Author: Felipe Balbi <balbi@ti.com> * Author: Mark A. Greer <mgreer@animalcreek.com> */ #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, const 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, const struct sk_buff *skb) { const 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) { const 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) { const 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) { const 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 const 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(const 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) { const 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 void 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); } #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); 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; 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; 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; 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 <mgreer@animalcreek.com>"); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");
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