1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * TI TRF7970a RFID/NFC Transceiver Driver 4 * 5 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 6 * 7 * Author: Erick Macias <emacias@ti.com> 8 * Author: Felipe Balbi <balbi@ti.com> 9 * Author: Mark A. Greer <mgreer@animalcreek.com> 10 */ 11 12#include <linux/module.h> 13#include <linux/device.h> 14#include <linux/netdevice.h> 15#include <linux/interrupt.h> 16#include <linux/pm_runtime.h> 17#include <linux/nfc.h> 18#include <linux/skbuff.h> 19#include <linux/delay.h> 20#include <linux/gpio/consumer.h> 21#include <linux/of.h> 22#include <linux/spi/spi.h> 23#include <linux/regulator/consumer.h> 24 25#include <net/nfc/nfc.h> 26#include <net/nfc/digital.h> 27 28/* There are 3 ways the host can communicate with the trf7970a: 29 * parallel mode, SPI with Slave Select (SS) mode, and SPI without 30 * SS mode. The driver only supports the two SPI modes. 31 * 32 * The trf7970a is very timing sensitive and the VIN, EN2, and EN 33 * pins must asserted in that order and with specific delays in between. 34 * The delays used in the driver were provided by TI and have been 35 * confirmed to work with this driver. There is a bug with the current 36 * version of the trf7970a that requires that EN2 remain low no matter 37 * what. If it goes high, it will generate an RF field even when in 38 * passive target mode. TI has indicated that the chip will work okay 39 * when EN2 is left low. The 'en2-rf-quirk' device tree property 40 * indicates that trf7970a currently being used has the erratum and 41 * that EN2 must be kept low. 42 * 43 * Timeouts are implemented using the delayed workqueue kernel facility. 44 * Timeouts are required so things don't hang when there is no response 45 * from the trf7970a (or tag). Using this mechanism creates a race with 46 * interrupts, however. That is, an interrupt and a timeout could occur 47 * closely enough together that one is blocked by the mutex while the other 48 * executes. When the timeout handler executes first and blocks the 49 * interrupt handler, it will eventually set the state to IDLE so the 50 * interrupt handler will check the state and exit with no harm done. 51 * When the interrupt handler executes first and blocks the timeout handler, 52 * the cancel_delayed_work() call will know that it didn't cancel the 53 * work item (i.e., timeout) and will return zero. That return code is 54 * used by the timer handler to indicate that it should ignore the timeout 55 * once its unblocked. 56 * 57 * Aborting an active command isn't as simple as it seems because the only 58 * way to abort a command that's already been sent to the tag is so turn 59 * off power to the tag. If we do that, though, we'd have to go through 60 * the entire anticollision procedure again but the digital layer doesn't 61 * support that. So, if an abort is received before trf7970a_send_cmd() 62 * has sent the command to the tag, it simply returns -ECANCELED. If the 63 * command has already been sent to the tag, then the driver continues 64 * normally and recieves the response data (or error) but just before 65 * sending the data upstream, it frees the rx_skb and sends -ECANCELED 66 * upstream instead. If the command failed, that error will be sent 67 * upstream. 68 * 69 * When recieving data from a tag and the interrupt status register has 70 * only the SRX bit set, it means that all of the data has been received 71 * (once what's in the fifo has been read). However, depending on timing 72 * an interrupt status with only the SRX bit set may not be recived. In 73 * those cases, the timeout mechanism is used to wait 20 ms in case more 74 * data arrives. After 20 ms, it is assumed that all of the data has been 75 * received and the accumulated rx data is sent upstream. The 76 * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose 77 * (i.e., it indicates that some data has been received but we're not sure 78 * if there is more coming so a timeout in this state means all data has 79 * been received and there isn't an error). The delay is 20 ms since delays 80 * of ~16 ms have been observed during testing. 81 * 82 * When transmitting a frame larger than the FIFO size (127 bytes), the 83 * driver will wait 20 ms for the FIFO to drain past the low-watermark 84 * and generate an interrupt. The low-watermark set to 32 bytes so the 85 * interrupt should fire after 127 - 32 = 95 bytes have been sent. At 86 * the lowest possible bit rate (6.62 kbps for 15693), it will take up 87 * to ~14.35 ms so 20 ms is used for the timeout. 88 * 89 * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. 90 * Having only 4 bits in the FIFO won't normally generate an interrupt so 91 * driver enables the '4_bit_RX' bit of the Special Functions register 1 92 * to cause an interrupt in that case. Leaving that bit for a read command 93 * messes up the data returned so it is only enabled when the framing is 94 * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. 95 * Unfortunately, that means that the driver has to peek into tx frames 96 * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by 97 * the trf7970a_per_cmd_config() routine. 98 * 99 * ISO/IEC 15693 frames specify whether to use single or double sub-carrier 100 * frequencies and whether to use low or high data rates in the flags byte 101 * of the frame. This means that the driver has to peek at all 15693 frames 102 * to determine what speed to set the communication to. In addition, write 103 * and lock commands use the OPTION flag to indicate that an EOF must be 104 * sent to the tag before it will send its response. So the driver has to 105 * examine all frames for that reason too. 106 * 107 * It is unclear how long to wait before sending the EOF. According to the 108 * Note under Table 1-1 in section 1.6 of 109 * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least 110 * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long 111 * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain 112 * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to 113 * ensure the wait is long enough before sending the EOF. This seems to work 114 * reliably. 115 */ 116 117#define TRF7970A_SUPPORTED_PROTOCOLS \ 118 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ 119 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ 120 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) 121 122#define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ 123#define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 124#define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 125 126#define TRF7970A_RX_SKB_ALLOC_SIZE 256 127 128#define TRF7970A_FIFO_SIZE 127 129 130/* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ 131#define TRF7970A_TX_MAX (4096 - 1) 132 133#define TRF7970A_WAIT_FOR_TX_IRQ 20 134#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 135#define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 136#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 137 138/* Guard times for various RF technologies (in us) */ 139#define TRF7970A_GUARD_TIME_NFCA 5000 140#define TRF7970A_GUARD_TIME_NFCB 5000 141#define TRF7970A_GUARD_TIME_NFCF 20000 142#define TRF7970A_GUARD_TIME_15693 1000 143 144/* Quirks */ 145/* Erratum: When reading IRQ Status register on trf7970a, we must issue a 146 * read continuous command for IRQ Status and Collision Position registers. 147 */ 148#define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) 149#define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) 150 151/* Direct commands */ 152#define TRF7970A_CMD_IDLE 0x00 153#define TRF7970A_CMD_SOFT_INIT 0x03 154#define TRF7970A_CMD_RF_COLLISION 0x04 155#define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 156#define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 157#define TRF7970A_CMD_FIFO_RESET 0x0f 158#define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 159#define TRF7970A_CMD_TRANSMIT 0x11 160#define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 161#define TRF7970A_CMD_DELAY_TRANSMIT 0x13 162#define TRF7970A_CMD_EOF 0x14 163#define TRF7970A_CMD_CLOSE_SLOT 0x15 164#define TRF7970A_CMD_BLOCK_RX 0x16 165#define TRF7970A_CMD_ENABLE_RX 0x17 166#define TRF7970A_CMD_TEST_INT_RF 0x18 167#define TRF7970A_CMD_TEST_EXT_RF 0x19 168#define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a 169 170/* Bits determining whether its a direct command or register R/W, 171 * whether to use a continuous SPI transaction or not, and the actual 172 * direct cmd opcode or regster address. 173 */ 174#define TRF7970A_CMD_BIT_CTRL BIT(7) 175#define TRF7970A_CMD_BIT_RW BIT(6) 176#define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) 177#define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) 178 179/* Registers addresses */ 180#define TRF7970A_CHIP_STATUS_CTRL 0x00 181#define TRF7970A_ISO_CTRL 0x01 182#define TRF7970A_ISO14443B_TX_OPTIONS 0x02 183#define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 184#define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 185#define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 186#define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 187#define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 188#define TRF7970A_RX_WAIT_TIME 0x08 189#define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 190#define TRF7970A_RX_SPECIAL_SETTINGS 0x0a 191#define TRF7970A_REG_IO_CTRL 0x0b 192#define TRF7970A_IRQ_STATUS 0x0c 193#define TRF7970A_COLLISION_IRQ_MASK 0x0d 194#define TRF7970A_COLLISION_POSITION 0x0e 195#define TRF7970A_RSSI_OSC_STATUS 0x0f 196#define TRF7970A_SPECIAL_FCN_REG1 0x10 197#define TRF7970A_SPECIAL_FCN_REG2 0x11 198#define TRF7970A_RAM1 0x12 199#define TRF7970A_RAM2 0x13 200#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 201#define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 202#define TRF7970A_NFCID1 0x17 203#define TRF7970A_NFC_TARGET_LEVEL 0x18 204#define TRF79070A_NFC_TARGET_PROTOCOL 0x19 205#define TRF7970A_TEST_REGISTER1 0x1a 206#define TRF7970A_TEST_REGISTER2 0x1b 207#define TRF7970A_FIFO_STATUS 0x1c 208#define TRF7970A_TX_LENGTH_BYTE1 0x1d 209#define TRF7970A_TX_LENGTH_BYTE2 0x1e 210#define TRF7970A_FIFO_IO_REGISTER 0x1f 211 212/* Chip Status Control Register Bits */ 213#define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) 214#define TRF7970A_CHIP_STATUS_REC_ON BIT(1) 215#define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) 216#define TRF7970A_CHIP_STATUS_PM_ON BIT(3) 217#define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) 218#define TRF7970A_CHIP_STATUS_RF_ON BIT(5) 219#define TRF7970A_CHIP_STATUS_DIRECT BIT(6) 220#define TRF7970A_CHIP_STATUS_STBY BIT(7) 221 222/* ISO Control Register Bits */ 223#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 224#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 225#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 226#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 227#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 228#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 229#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 230#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 231#define TRF7970A_ISO_CTRL_14443A_106 0x08 232#define TRF7970A_ISO_CTRL_14443A_212 0x09 233#define TRF7970A_ISO_CTRL_14443A_424 0x0a 234#define TRF7970A_ISO_CTRL_14443A_848 0x0b 235#define TRF7970A_ISO_CTRL_14443B_106 0x0c 236#define TRF7970A_ISO_CTRL_14443B_212 0x0d 237#define TRF7970A_ISO_CTRL_14443B_424 0x0e 238#define TRF7970A_ISO_CTRL_14443B_848 0x0f 239#define TRF7970A_ISO_CTRL_FELICA_212 0x1a 240#define TRF7970A_ISO_CTRL_FELICA_424 0x1b 241#define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 242#define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 243#define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 244#define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 245#define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 246#define TRF7970A_ISO_CTRL_NFC_CE BIT(2) 247#define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) 248#define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) 249#define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) 250#define TRF7970A_ISO_CTRL_RFID BIT(5) 251#define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) 252#define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ 253 254#define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f 255 256/* Modulator and SYS_CLK Control Register Bits */ 257#define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) 258#define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) 259#define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) 260#define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) 261#define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) 262#define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) 263#define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) 264#define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) 265#define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) 266#define TRF7970A_MODULATOR_EN_ANA BIT(3) 267#define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) 268#define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) 269#define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) 270#define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) 271#define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) 272#define TRF7970A_MODULATOR_EN_OOK BIT(6) 273#define TRF7970A_MODULATOR_27MHZ BIT(7) 274 275#define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) 276#define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) 277#define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) 278#define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) 279#define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) 280#define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) 281#define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) 282#define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) 283#define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) 284#define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) 285 286#define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) 287#define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) 288#define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) 289#define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) 290 291/* IRQ Status Register Bits */ 292#define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ 293#define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) 294#define TRF7970A_IRQ_STATUS_COL BIT(1) 295#define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) 296#define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) 297#define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) 298#define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) 299#define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) 300#define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) 301#define TRF7970A_IRQ_STATUS_FIFO BIT(5) 302#define TRF7970A_IRQ_STATUS_SRX BIT(6) 303#define TRF7970A_IRQ_STATUS_TX BIT(7) 304 305#define TRF7970A_IRQ_STATUS_ERROR \ 306 (TRF7970A_IRQ_STATUS_COL | \ 307 TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ 308 TRF7970A_IRQ_STATUS_PARITY_ERROR | \ 309 TRF7970A_IRQ_STATUS_CRC_ERROR) 310 311#define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0)) 312#define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3)) 313#define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6) 314 315#define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) 316#define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) 317#define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) 318#define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) 319#define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) 320#define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) 321 322#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) 323#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) 324#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) 325#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) 326#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 327#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 328#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 329#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 330 331#define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) 332#define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) 333 334#define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) 335#define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) 336#define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) 337#define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) 338#define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) 339#define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) 340 341#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) 342#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) 343#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) 344#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) 345#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) 346#define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) 347#define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) 348#define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) 349 350#define TRF79070A_NFC_TARGET_PROTOCOL_106A \ 351 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 352 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 353 TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ 354 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) 355 356#define TRF79070A_NFC_TARGET_PROTOCOL_106B \ 357 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 358 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 359 TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ 360 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) 361 362#define TRF79070A_NFC_TARGET_PROTOCOL_212F \ 363 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 364 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 365 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ 366 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) 367 368#define TRF79070A_NFC_TARGET_PROTOCOL_424F \ 369 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 370 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 371 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ 372 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) 373 374#define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) 375 376/* NFC (ISO/IEC 14443A) Type 2 Tag commands */ 377#define NFC_T2T_CMD_READ 0x30 378 379/* ISO 15693 commands codes */ 380#define ISO15693_CMD_INVENTORY 0x01 381#define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 382#define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 383#define ISO15693_CMD_LOCK_BLOCK 0x22 384#define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 385#define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 386#define ISO15693_CMD_SELECT 0x25 387#define ISO15693_CMD_RESET_TO_READY 0x26 388#define ISO15693_CMD_WRITE_AFI 0x27 389#define ISO15693_CMD_LOCK_AFI 0x28 390#define ISO15693_CMD_WRITE_DSFID 0x29 391#define ISO15693_CMD_LOCK_DSFID 0x2a 392#define ISO15693_CMD_GET_SYSTEM_INFO 0x2b 393#define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c 394 395/* ISO 15693 request and response flags */ 396#define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) 397#define ISO15693_REQ_FLAG_DATA_RATE BIT(1) 398#define ISO15693_REQ_FLAG_INVENTORY BIT(2) 399#define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) 400#define ISO15693_REQ_FLAG_SELECT BIT(4) 401#define ISO15693_REQ_FLAG_AFI BIT(4) 402#define ISO15693_REQ_FLAG_ADDRESS BIT(5) 403#define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) 404#define ISO15693_REQ_FLAG_OPTION BIT(6) 405 406#define ISO15693_REQ_FLAG_SPEED_MASK \ 407 (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) 408 409enum trf7970a_state { 410 TRF7970A_ST_PWR_OFF, 411 TRF7970A_ST_RF_OFF, 412 TRF7970A_ST_IDLE, 413 TRF7970A_ST_IDLE_RX_BLOCKED, 414 TRF7970A_ST_WAIT_FOR_TX_FIFO, 415 TRF7970A_ST_WAIT_FOR_RX_DATA, 416 TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, 417 TRF7970A_ST_WAIT_TO_ISSUE_EOF, 418 TRF7970A_ST_LISTENING, 419 TRF7970A_ST_LISTENING_MD, 420 TRF7970A_ST_MAX 421}; 422 423struct trf7970a { 424 enum trf7970a_state state; 425 struct device *dev; 426 struct spi_device *spi; 427 struct regulator *regulator; 428 struct nfc_digital_dev *ddev; 429 u32 quirks; 430 bool is_initiator; 431 bool aborting; 432 struct sk_buff *tx_skb; 433 struct sk_buff *rx_skb; 434 nfc_digital_cmd_complete_t cb; 435 void *cb_arg; 436 u8 chip_status_ctrl; 437 u8 iso_ctrl; 438 u8 iso_ctrl_tech; 439 u8 modulator_sys_clk_ctrl; 440 u8 special_fcn_reg1; 441 u8 io_ctrl; 442 unsigned int guard_time; 443 int technology; 444 int framing; 445 u8 md_rf_tech; 446 u8 tx_cmd; 447 bool issue_eof; 448 struct gpio_desc *en_gpiod; 449 struct gpio_desc *en2_gpiod; 450 struct mutex lock; 451 unsigned int timeout; 452 bool ignore_timeout; 453 struct delayed_work timeout_work; 454}; 455 456static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) 457{ 458 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); 459 int ret; 460 461 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); 462 463 ret = spi_write(trf->spi, &cmd, 1); 464 if (ret) 465 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, 466 ret); 467 return ret; 468} 469 470static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) 471{ 472 u8 addr = TRF7970A_CMD_BIT_RW | reg; 473 int ret; 474 475 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); 476 if (ret) 477 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 478 ret); 479 480 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); 481 482 return ret; 483} 484 485static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, 486 size_t len) 487{ 488 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; 489 struct spi_transfer t[2]; 490 struct spi_message m; 491 int ret; 492 493 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); 494 495 spi_message_init(&m); 496 497 memset(&t, 0, sizeof(t)); 498 499 t[0].tx_buf = &addr; 500 t[0].len = sizeof(addr); 501 spi_message_add_tail(&t[0], &m); 502 503 t[1].rx_buf = buf; 504 t[1].len = len; 505 spi_message_add_tail(&t[1], &m); 506 507 ret = spi_sync(trf->spi, &m); 508 if (ret) 509 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 510 ret); 511 return ret; 512} 513 514static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) 515{ 516 u8 buf[2] = { reg, val }; 517 int ret; 518 519 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); 520 521 ret = spi_write(trf->spi, buf, 2); 522 if (ret) 523 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, 524 buf[0], buf[1], ret); 525 526 return ret; 527} 528 529static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) 530{ 531 int ret; 532 u8 buf[2]; 533 u8 addr; 534 535 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; 536 537 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { 538 addr |= TRF7970A_CMD_BIT_CONTINUOUS; 539 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 540 } else { 541 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); 542 } 543 544 if (ret) 545 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", 546 __func__, ret); 547 else 548 *status = buf[0]; 549 550 return ret; 551} 552 553static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) 554{ 555 int ret; 556 u8 buf[2]; 557 u8 addr; 558 559 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | 560 TRF7970A_CMD_BIT_CONTINUOUS; 561 562 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 563 if (ret) 564 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", 565 __func__, ret); 566 else 567 *target_proto = buf[0]; 568 569 return ret; 570} 571 572static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) 573{ 574 int ret; 575 u8 target_proto, tech; 576 577 ret = trf7970a_read_target_proto(trf, &target_proto); 578 if (ret) 579 return ret; 580 581 switch (target_proto) { 582 case TRF79070A_NFC_TARGET_PROTOCOL_106A: 583 tech = NFC_DIGITAL_RF_TECH_106A; 584 break; 585 case TRF79070A_NFC_TARGET_PROTOCOL_106B: 586 tech = NFC_DIGITAL_RF_TECH_106B; 587 break; 588 case TRF79070A_NFC_TARGET_PROTOCOL_212F: 589 tech = NFC_DIGITAL_RF_TECH_212F; 590 break; 591 case TRF79070A_NFC_TARGET_PROTOCOL_424F: 592 tech = NFC_DIGITAL_RF_TECH_424F; 593 break; 594 default: 595 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", 596 __func__, target_proto); 597 return -EIO; 598 } 599 600 *rf_tech = tech; 601 602 return ret; 603} 604 605static void trf7970a_send_upstream(struct trf7970a *trf) 606{ 607 dev_kfree_skb_any(trf->tx_skb); 608 trf->tx_skb = NULL; 609 610 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) 611 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, 612 16, 1, trf->rx_skb->data, trf->rx_skb->len, 613 false); 614 615 trf->state = TRF7970A_ST_IDLE; 616 617 if (trf->aborting) { 618 dev_dbg(trf->dev, "Abort process complete\n"); 619 620 if (!IS_ERR(trf->rx_skb)) { 621 kfree_skb(trf->rx_skb); 622 trf->rx_skb = ERR_PTR(-ECANCELED); 623 } 624 625 trf->aborting = false; 626 } 627 628 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); 629 630 trf->rx_skb = NULL; 631} 632 633static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) 634{ 635 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); 636 637 cancel_delayed_work(&trf->timeout_work); 638 639 kfree_skb(trf->rx_skb); 640 trf->rx_skb = ERR_PTR(errno); 641 642 trf7970a_send_upstream(trf); 643} 644 645static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, 646 unsigned int len, u8 *prefix, 647 unsigned int prefix_len) 648{ 649 struct spi_transfer t[2]; 650 struct spi_message m; 651 unsigned int timeout; 652 int ret; 653 654 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, 655 16, 1, skb->data, len, false); 656 657 spi_message_init(&m); 658 659 memset(&t, 0, sizeof(t)); 660 661 t[0].tx_buf = prefix; 662 t[0].len = prefix_len; 663 spi_message_add_tail(&t[0], &m); 664 665 t[1].tx_buf = skb->data; 666 t[1].len = len; 667 spi_message_add_tail(&t[1], &m); 668 669 ret = spi_sync(trf->spi, &m); 670 if (ret) { 671 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, 672 ret); 673 return ret; 674 } 675 676 skb_pull(skb, len); 677 678 if (skb->len > 0) { 679 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; 680 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; 681 } else { 682 if (trf->issue_eof) { 683 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; 684 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; 685 } else { 686 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 687 688 if (!trf->timeout) 689 timeout = TRF7970A_WAIT_FOR_TX_IRQ; 690 else 691 timeout = trf->timeout; 692 } 693 } 694 695 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, 696 trf->state); 697 698 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 699 700 return 0; 701} 702 703static void trf7970a_fill_fifo(struct trf7970a *trf) 704{ 705 struct sk_buff *skb = trf->tx_skb; 706 unsigned int len; 707 int ret; 708 u8 fifo_bytes; 709 u8 prefix; 710 711 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 712 if (ret) { 713 trf7970a_send_err_upstream(trf, ret); 714 return; 715 } 716 717 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 718 719 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 720 721 /* Calculate how much more data can be written to the fifo */ 722 len = TRF7970A_FIFO_SIZE - fifo_bytes; 723 if (!len) { 724 schedule_delayed_work(&trf->timeout_work, 725 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); 726 return; 727 } 728 729 len = min(skb->len, len); 730 731 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; 732 733 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); 734 if (ret) 735 trf7970a_send_err_upstream(trf, ret); 736} 737 738static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) 739{ 740 struct sk_buff *skb = trf->rx_skb; 741 int ret; 742 u8 fifo_bytes; 743 744 if (status & TRF7970A_IRQ_STATUS_ERROR) { 745 trf7970a_send_err_upstream(trf, -EIO); 746 return; 747 } 748 749 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 750 if (ret) { 751 trf7970a_send_err_upstream(trf, ret); 752 return; 753 } 754 755 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 756 757 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 758 759 if (!fifo_bytes) 760 goto no_rx_data; 761 762 if (fifo_bytes > skb_tailroom(skb)) { 763 skb = skb_copy_expand(skb, skb_headroom(skb), 764 max_t(int, fifo_bytes, 765 TRF7970A_RX_SKB_ALLOC_SIZE), 766 GFP_KERNEL); 767 if (!skb) { 768 trf7970a_send_err_upstream(trf, -ENOMEM); 769 return; 770 } 771 772 kfree_skb(trf->rx_skb); 773 trf->rx_skb = skb; 774 } 775 776 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, 777 skb_put(skb, fifo_bytes), fifo_bytes); 778 if (ret) { 779 trf7970a_send_err_upstream(trf, ret); 780 return; 781 } 782 783 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ 784 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && 785 (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { 786 skb->data[0] >>= 4; 787 status = TRF7970A_IRQ_STATUS_SRX; 788 } else { 789 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; 790 791 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 792 if (ret) { 793 trf7970a_send_err_upstream(trf, ret); 794 return; 795 } 796 797 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 798 799 /* If there are bytes in the FIFO, set status to '0' so 800 * the if stmt below doesn't fire and the driver will wait 801 * for the trf7970a to generate another RX interrupt. 802 */ 803 if (fifo_bytes) 804 status = 0; 805 } 806 807no_rx_data: 808 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ 809 trf7970a_send_upstream(trf); 810 return; 811 } 812 813 dev_dbg(trf->dev, "Setting timeout for %d ms\n", 814 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); 815 816 schedule_delayed_work(&trf->timeout_work, 817 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); 818} 819 820static irqreturn_t trf7970a_irq(int irq, void *dev_id) 821{ 822 struct trf7970a *trf = dev_id; 823 int ret; 824 u8 status, fifo_bytes, iso_ctrl; 825 826 mutex_lock(&trf->lock); 827 828 if (trf->state == TRF7970A_ST_RF_OFF) { 829 mutex_unlock(&trf->lock); 830 return IRQ_NONE; 831 } 832 833 ret = trf7970a_read_irqstatus(trf, &status); 834 if (ret) { 835 mutex_unlock(&trf->lock); 836 return IRQ_NONE; 837 } 838 839 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, 840 status); 841 842 if (!status) { 843 mutex_unlock(&trf->lock); 844 return IRQ_NONE; 845 } 846 847 switch (trf->state) { 848 case TRF7970A_ST_IDLE: 849 case TRF7970A_ST_IDLE_RX_BLOCKED: 850 /* If initiator and getting interrupts caused by RF noise, 851 * turn off the receiver to avoid unnecessary interrupts. 852 * It will be turned back on in trf7970a_send_cmd() when 853 * the next command is issued. 854 */ 855 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { 856 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); 857 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; 858 } 859 860 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 861 break; 862 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 863 if (status & TRF7970A_IRQ_STATUS_TX) { 864 trf->ignore_timeout = 865 !cancel_delayed_work(&trf->timeout_work); 866 trf7970a_fill_fifo(trf); 867 } else { 868 trf7970a_send_err_upstream(trf, -EIO); 869 } 870 break; 871 case TRF7970A_ST_WAIT_FOR_RX_DATA: 872 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 873 if (status & TRF7970A_IRQ_STATUS_SRX) { 874 trf->ignore_timeout = 875 !cancel_delayed_work(&trf->timeout_work); 876 trf7970a_drain_fifo(trf, status); 877 } else if (status & TRF7970A_IRQ_STATUS_FIFO) { 878 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, 879 &fifo_bytes); 880 881 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 882 883 if (ret) 884 trf7970a_send_err_upstream(trf, ret); 885 else if (!fifo_bytes) 886 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 887 } else if ((status == TRF7970A_IRQ_STATUS_TX) || 888 (!trf->is_initiator && 889 (status == (TRF7970A_IRQ_STATUS_TX | 890 TRF7970A_IRQ_STATUS_NFC_RF)))) { 891 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 892 893 if (!trf->timeout) { 894 trf->ignore_timeout = 895 !cancel_delayed_work(&trf->timeout_work); 896 trf->rx_skb = ERR_PTR(0); 897 trf7970a_send_upstream(trf); 898 break; 899 } 900 901 if (trf->is_initiator) 902 break; 903 904 iso_ctrl = trf->iso_ctrl; 905 906 switch (trf->framing) { 907 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 908 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 909 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 910 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 911 break; 912 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 913 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 914 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 915 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 916 break; 917 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 918 ret = trf7970a_write(trf, 919 TRF7970A_SPECIAL_FCN_REG1, 920 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); 921 if (ret) 922 goto err_unlock_exit; 923 924 trf->special_fcn_reg1 = 925 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; 926 break; 927 default: 928 break; 929 } 930 931 if (iso_ctrl != trf->iso_ctrl) { 932 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 933 iso_ctrl); 934 if (ret) 935 goto err_unlock_exit; 936 937 trf->iso_ctrl = iso_ctrl; 938 } 939 } else { 940 trf7970a_send_err_upstream(trf, -EIO); 941 } 942 break; 943 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 944 if (status != TRF7970A_IRQ_STATUS_TX) 945 trf7970a_send_err_upstream(trf, -EIO); 946 break; 947 case TRF7970A_ST_LISTENING: 948 if (status & TRF7970A_IRQ_STATUS_SRX) { 949 trf->ignore_timeout = 950 !cancel_delayed_work(&trf->timeout_work); 951 trf7970a_drain_fifo(trf, status); 952 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 953 trf7970a_send_err_upstream(trf, -EIO); 954 } 955 break; 956 case TRF7970A_ST_LISTENING_MD: 957 if (status & TRF7970A_IRQ_STATUS_SRX) { 958 trf->ignore_timeout = 959 !cancel_delayed_work(&trf->timeout_work); 960 961 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); 962 if (ret) { 963 trf7970a_send_err_upstream(trf, ret); 964 } else { 965 trf->state = TRF7970A_ST_LISTENING; 966 trf7970a_drain_fifo(trf, status); 967 } 968 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 969 trf7970a_send_err_upstream(trf, -EIO); 970 } 971 break; 972 default: 973 dev_err(trf->dev, "%s - Driver in invalid state: %d\n", 974 __func__, trf->state); 975 } 976 977err_unlock_exit: 978 mutex_unlock(&trf->lock); 979 return IRQ_HANDLED; 980} 981 982static void trf7970a_issue_eof(struct trf7970a *trf) 983{ 984 int ret; 985 986 dev_dbg(trf->dev, "Issuing EOF\n"); 987 988 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 989 if (ret) 990 trf7970a_send_err_upstream(trf, ret); 991 992 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); 993 if (ret) 994 trf7970a_send_err_upstream(trf, ret); 995 996 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 997 998 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", 999 trf->timeout, trf->state); 1000 1001 schedule_delayed_work(&trf->timeout_work, 1002 msecs_to_jiffies(trf->timeout)); 1003} 1004 1005static void trf7970a_timeout_work_handler(struct work_struct *work) 1006{ 1007 struct trf7970a *trf = container_of(work, struct trf7970a, 1008 timeout_work.work); 1009 1010 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", 1011 trf->state, trf->ignore_timeout); 1012 1013 mutex_lock(&trf->lock); 1014 1015 if (trf->ignore_timeout) 1016 trf->ignore_timeout = false; 1017 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) 1018 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); 1019 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) 1020 trf7970a_issue_eof(trf); 1021 else 1022 trf7970a_send_err_upstream(trf, -ETIMEDOUT); 1023 1024 mutex_unlock(&trf->lock); 1025} 1026 1027static int trf7970a_init(struct trf7970a *trf) 1028{ 1029 int ret; 1030 1031 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); 1032 1033 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); 1034 if (ret) 1035 goto err_out; 1036 1037 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); 1038 if (ret) 1039 goto err_out; 1040 1041 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1042 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1043 if (ret) 1044 goto err_out; 1045 1046 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1047 if (ret) 1048 goto err_out; 1049 1050 usleep_range(1000, 2000); 1051 1052 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1053 1054 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1055 trf->modulator_sys_clk_ctrl); 1056 if (ret) 1057 goto err_out; 1058 1059 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, 1060 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | 1061 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); 1062 if (ret) 1063 goto err_out; 1064 1065 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); 1066 if (ret) 1067 goto err_out; 1068 1069 trf->special_fcn_reg1 = 0; 1070 1071 trf->iso_ctrl = 0xff; 1072 return 0; 1073 1074err_out: 1075 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); 1076 return ret; 1077} 1078 1079static void trf7970a_switch_rf_off(struct trf7970a *trf) 1080{ 1081 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1082 (trf->state == TRF7970A_ST_RF_OFF)) 1083 return; 1084 1085 dev_dbg(trf->dev, "Switching rf off\n"); 1086 1087 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1088 1089 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); 1090 1091 trf->aborting = false; 1092 trf->state = TRF7970A_ST_RF_OFF; 1093 1094 pm_runtime_mark_last_busy(trf->dev); 1095 pm_runtime_put_autosuspend(trf->dev); 1096} 1097 1098static int trf7970a_switch_rf_on(struct trf7970a *trf) 1099{ 1100 int ret; 1101 1102 dev_dbg(trf->dev, "Switching rf on\n"); 1103 1104 pm_runtime_get_sync(trf->dev); 1105 1106 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ 1107 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, 1108 trf->state); 1109 return -EINVAL; 1110 } 1111 1112 ret = trf7970a_init(trf); 1113 if (ret) { 1114 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); 1115 return ret; 1116 } 1117 1118 trf->state = TRF7970A_ST_IDLE; 1119 1120 return 0; 1121} 1122 1123static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) 1124{ 1125 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1126 int ret = 0; 1127 1128 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); 1129 1130 mutex_lock(&trf->lock); 1131 1132 if (on) { 1133 switch (trf->state) { 1134 case TRF7970A_ST_PWR_OFF: 1135 case TRF7970A_ST_RF_OFF: 1136 ret = trf7970a_switch_rf_on(trf); 1137 break; 1138 case TRF7970A_ST_IDLE: 1139 case TRF7970A_ST_IDLE_RX_BLOCKED: 1140 break; 1141 default: 1142 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1143 __func__, trf->state, on); 1144 trf7970a_switch_rf_off(trf); 1145 ret = -EINVAL; 1146 } 1147 } else { 1148 switch (trf->state) { 1149 case TRF7970A_ST_PWR_OFF: 1150 case TRF7970A_ST_RF_OFF: 1151 break; 1152 default: 1153 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1154 __func__, trf->state, on); 1155 ret = -EINVAL; 1156 fallthrough; 1157 case TRF7970A_ST_IDLE: 1158 case TRF7970A_ST_IDLE_RX_BLOCKED: 1159 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1160 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1161 trf7970a_switch_rf_off(trf); 1162 } 1163 } 1164 1165 mutex_unlock(&trf->lock); 1166 return ret; 1167} 1168 1169static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) 1170{ 1171 int ret = 0; 1172 1173 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1174 1175 switch (tech) { 1176 case NFC_DIGITAL_RF_TECH_106A: 1177 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; 1178 trf->modulator_sys_clk_ctrl = 1179 (trf->modulator_sys_clk_ctrl & 0xf8) | 1180 TRF7970A_MODULATOR_DEPTH_OOK; 1181 trf->guard_time = TRF7970A_GUARD_TIME_NFCA; 1182 break; 1183 case NFC_DIGITAL_RF_TECH_106B: 1184 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; 1185 trf->modulator_sys_clk_ctrl = 1186 (trf->modulator_sys_clk_ctrl & 0xf8) | 1187 TRF7970A_MODULATOR_DEPTH_ASK10; 1188 trf->guard_time = TRF7970A_GUARD_TIME_NFCB; 1189 break; 1190 case NFC_DIGITAL_RF_TECH_212F: 1191 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; 1192 trf->modulator_sys_clk_ctrl = 1193 (trf->modulator_sys_clk_ctrl & 0xf8) | 1194 TRF7970A_MODULATOR_DEPTH_ASK10; 1195 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1196 break; 1197 case NFC_DIGITAL_RF_TECH_424F: 1198 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; 1199 trf->modulator_sys_clk_ctrl = 1200 (trf->modulator_sys_clk_ctrl & 0xf8) | 1201 TRF7970A_MODULATOR_DEPTH_ASK10; 1202 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1203 break; 1204 case NFC_DIGITAL_RF_TECH_ISO15693: 1205 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1206 trf->modulator_sys_clk_ctrl = 1207 (trf->modulator_sys_clk_ctrl & 0xf8) | 1208 TRF7970A_MODULATOR_DEPTH_OOK; 1209 trf->guard_time = TRF7970A_GUARD_TIME_15693; 1210 break; 1211 default: 1212 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1213 return -EINVAL; 1214 } 1215 1216 trf->technology = tech; 1217 1218 /* If in initiator mode and not changing the RF tech due to a 1219 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from 1220 * trf7970a_init()), clear the NFC Target Detection Level register 1221 * due to erratum. 1222 */ 1223 if (trf->iso_ctrl == 0xff) 1224 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1225 1226 return ret; 1227} 1228 1229static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) 1230{ 1231 int ret; 1232 u8 rssi; 1233 1234 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1235 trf->chip_status_ctrl | 1236 TRF7970A_CHIP_STATUS_REC_ON); 1237 if (ret) 1238 return ret; 1239 1240 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); 1241 if (ret) 1242 return ret; 1243 1244 usleep_range(50, 60); 1245 1246 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); 1247 if (ret) 1248 return ret; 1249 1250 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1251 trf->chip_status_ctrl); 1252 if (ret) 1253 return ret; 1254 1255 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) 1256 *is_rf_field = true; 1257 else 1258 *is_rf_field = false; 1259 1260 return 0; 1261} 1262 1263static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) 1264{ 1265 u8 iso_ctrl = trf->iso_ctrl_tech; 1266 bool is_rf_field = false; 1267 int ret; 1268 1269 dev_dbg(trf->dev, "framing: %d\n", framing); 1270 1271 switch (framing) { 1272 case NFC_DIGITAL_FRAMING_NFCA_SHORT: 1273 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1274 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1275 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1276 break; 1277 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1278 case NFC_DIGITAL_FRAMING_NFCA_T4T: 1279 case NFC_DIGITAL_FRAMING_NFCB: 1280 case NFC_DIGITAL_FRAMING_NFCB_T4T: 1281 case NFC_DIGITAL_FRAMING_NFCF: 1282 case NFC_DIGITAL_FRAMING_NFCF_T3T: 1283 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: 1284 case NFC_DIGITAL_FRAMING_ISO15693_T5T: 1285 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1286 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1287 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1288 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1289 break; 1290 case NFC_DIGITAL_FRAMING_NFCA_T2T: 1291 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1292 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1293 break; 1294 default: 1295 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1296 return -EINVAL; 1297 } 1298 1299 trf->framing = framing; 1300 1301 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1302 ret = trf7970a_is_rf_field(trf, &is_rf_field); 1303 if (ret) 1304 return ret; 1305 1306 if (is_rf_field) 1307 return -EBUSY; 1308 } 1309 1310 if (iso_ctrl != trf->iso_ctrl) { 1311 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1312 if (ret) 1313 return ret; 1314 1315 trf->iso_ctrl = iso_ctrl; 1316 1317 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1318 trf->modulator_sys_clk_ctrl); 1319 if (ret) 1320 return ret; 1321 } 1322 1323 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1324 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1325 trf->chip_status_ctrl | 1326 TRF7970A_CHIP_STATUS_RF_ON); 1327 if (ret) 1328 return ret; 1329 1330 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1331 1332 usleep_range(trf->guard_time, trf->guard_time + 1000); 1333 } 1334 1335 return 0; 1336} 1337 1338static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, 1339 int param) 1340{ 1341 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1342 int ret; 1343 1344 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1345 1346 mutex_lock(&trf->lock); 1347 1348 trf->is_initiator = true; 1349 1350 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1351 (trf->state == TRF7970A_ST_RF_OFF)) { 1352 ret = trf7970a_switch_rf_on(trf); 1353 if (ret) 1354 goto err_unlock; 1355 } 1356 1357 switch (type) { 1358 case NFC_DIGITAL_CONFIG_RF_TECH: 1359 ret = trf7970a_in_config_rf_tech(trf, param); 1360 break; 1361 case NFC_DIGITAL_CONFIG_FRAMING: 1362 ret = trf7970a_in_config_framing(trf, param); 1363 break; 1364 default: 1365 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1366 ret = -EINVAL; 1367 } 1368 1369err_unlock: 1370 mutex_unlock(&trf->lock); 1371 return ret; 1372} 1373 1374static int trf7970a_is_iso15693_write_or_lock(u8 cmd) 1375{ 1376 switch (cmd) { 1377 case ISO15693_CMD_WRITE_SINGLE_BLOCK: 1378 case ISO15693_CMD_LOCK_BLOCK: 1379 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: 1380 case ISO15693_CMD_WRITE_AFI: 1381 case ISO15693_CMD_LOCK_AFI: 1382 case ISO15693_CMD_WRITE_DSFID: 1383 case ISO15693_CMD_LOCK_DSFID: 1384 return 1; 1385 default: 1386 return 0; 1387 } 1388} 1389 1390static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) 1391{ 1392 u8 *req = skb->data; 1393 u8 special_fcn_reg1, iso_ctrl; 1394 int ret; 1395 1396 trf->issue_eof = false; 1397 1398 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in 1399 * special functions register 1 is cleared; otherwise, its a write or 1400 * sector select command and '4_bit_RX' must be set. 1401 * 1402 * When issuing an ISO 15693 command, inspect the flags byte to see 1403 * what speed to use. Also, remember if the OPTION flag is set on 1404 * a Type 5 write or lock command so the driver will know that it 1405 * has to send an EOF in order to get a response. 1406 */ 1407 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && 1408 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { 1409 if (req[0] == NFC_T2T_CMD_READ) 1410 special_fcn_reg1 = 0; 1411 else 1412 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; 1413 1414 if (special_fcn_reg1 != trf->special_fcn_reg1) { 1415 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 1416 special_fcn_reg1); 1417 if (ret) 1418 return ret; 1419 1420 trf->special_fcn_reg1 = special_fcn_reg1; 1421 } 1422 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { 1423 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; 1424 1425 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { 1426 case 0x00: 1427 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; 1428 break; 1429 case ISO15693_REQ_FLAG_SUB_CARRIER: 1430 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; 1431 break; 1432 case ISO15693_REQ_FLAG_DATA_RATE: 1433 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1434 break; 1435 case (ISO15693_REQ_FLAG_SUB_CARRIER | 1436 ISO15693_REQ_FLAG_DATA_RATE): 1437 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; 1438 break; 1439 } 1440 1441 if (iso_ctrl != trf->iso_ctrl) { 1442 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1443 if (ret) 1444 return ret; 1445 1446 trf->iso_ctrl = iso_ctrl; 1447 } 1448 1449 if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && 1450 trf7970a_is_iso15693_write_or_lock(req[1]) && 1451 (req[0] & ISO15693_REQ_FLAG_OPTION)) 1452 trf->issue_eof = true; 1453 } 1454 1455 return 0; 1456} 1457 1458static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, 1459 struct sk_buff *skb, u16 timeout, 1460 nfc_digital_cmd_complete_t cb, void *arg) 1461{ 1462 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1463 u8 prefix[5]; 1464 unsigned int len; 1465 int ret; 1466 u8 status; 1467 1468 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", 1469 trf->state, timeout, skb->len); 1470 1471 if (skb->len > TRF7970A_TX_MAX) 1472 return -EINVAL; 1473 1474 mutex_lock(&trf->lock); 1475 1476 if ((trf->state != TRF7970A_ST_IDLE) && 1477 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1478 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1479 trf->state); 1480 ret = -EIO; 1481 goto out_err; 1482 } 1483 1484 if (trf->aborting) { 1485 dev_dbg(trf->dev, "Abort process complete\n"); 1486 trf->aborting = false; 1487 ret = -ECANCELED; 1488 goto out_err; 1489 } 1490 1491 if (timeout) { 1492 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1493 GFP_KERNEL); 1494 if (!trf->rx_skb) { 1495 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1496 ret = -ENOMEM; 1497 goto out_err; 1498 } 1499 } 1500 1501 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { 1502 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1503 if (ret) 1504 goto out_err; 1505 1506 trf->state = TRF7970A_ST_IDLE; 1507 } 1508 1509 if (trf->is_initiator) { 1510 ret = trf7970a_per_cmd_config(trf, skb); 1511 if (ret) 1512 goto out_err; 1513 } 1514 1515 trf->ddev = ddev; 1516 trf->tx_skb = skb; 1517 trf->cb = cb; 1518 trf->cb_arg = arg; 1519 trf->timeout = timeout; 1520 trf->ignore_timeout = false; 1521 1522 len = skb->len; 1523 1524 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends 1525 * on what the current framing is, the address of the TX length byte 1 1526 * register (0x1d), and the 2 byte length of the data to be transmitted. 1527 * That totals 5 bytes. 1528 */ 1529 prefix[0] = TRF7970A_CMD_BIT_CTRL | 1530 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); 1531 prefix[1] = TRF7970A_CMD_BIT_CTRL | 1532 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); 1533 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; 1534 1535 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { 1536 prefix[3] = 0x00; 1537 prefix[4] = 0x0f; /* 7 bits */ 1538 } else { 1539 prefix[3] = (len & 0xf00) >> 4; 1540 prefix[3] |= ((len & 0xf0) >> 4); 1541 prefix[4] = ((len & 0x0f) << 4); 1542 } 1543 1544 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); 1545 1546 /* Clear possible spurious interrupt */ 1547 ret = trf7970a_read_irqstatus(trf, &status); 1548 if (ret) 1549 goto out_err; 1550 1551 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); 1552 if (ret) { 1553 kfree_skb(trf->rx_skb); 1554 trf->rx_skb = NULL; 1555 } 1556 1557out_err: 1558 mutex_unlock(&trf->lock); 1559 return ret; 1560} 1561 1562static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) 1563{ 1564 int ret = 0; 1565 1566 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1567 1568 switch (tech) { 1569 case NFC_DIGITAL_RF_TECH_106A: 1570 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1571 TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; 1572 trf->modulator_sys_clk_ctrl = 1573 (trf->modulator_sys_clk_ctrl & 0xf8) | 1574 TRF7970A_MODULATOR_DEPTH_OOK; 1575 break; 1576 case NFC_DIGITAL_RF_TECH_212F: 1577 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1578 TRF7970A_ISO_CTRL_NFC_NFCF_212; 1579 trf->modulator_sys_clk_ctrl = 1580 (trf->modulator_sys_clk_ctrl & 0xf8) | 1581 TRF7970A_MODULATOR_DEPTH_ASK10; 1582 break; 1583 case NFC_DIGITAL_RF_TECH_424F: 1584 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1585 TRF7970A_ISO_CTRL_NFC_NFCF_424; 1586 trf->modulator_sys_clk_ctrl = 1587 (trf->modulator_sys_clk_ctrl & 0xf8) | 1588 TRF7970A_MODULATOR_DEPTH_ASK10; 1589 break; 1590 default: 1591 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1592 return -EINVAL; 1593 } 1594 1595 trf->technology = tech; 1596 1597 /* Normally we write the ISO_CTRL register in 1598 * trf7970a_tg_config_framing() because the framing can change 1599 * the value written. However, when sending a PSL RES, 1600 * digital_tg_send_psl_res_complete() doesn't call 1601 * trf7970a_tg_config_framing() so we must write the register 1602 * here. 1603 */ 1604 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && 1605 (trf->iso_ctrl_tech != trf->iso_ctrl)) { 1606 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 1607 trf->iso_ctrl_tech); 1608 1609 trf->iso_ctrl = trf->iso_ctrl_tech; 1610 } 1611 1612 return ret; 1613} 1614 1615/* Since this is a target routine, several of the framing calls are 1616 * made between receiving the request and sending the response so they 1617 * should take effect until after the response is sent. This is accomplished 1618 * by skipping the ISO_CTRL register write here and doing it in the interrupt 1619 * handler. 1620 */ 1621static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) 1622{ 1623 u8 iso_ctrl = trf->iso_ctrl_tech; 1624 int ret; 1625 1626 dev_dbg(trf->dev, "framing: %d\n", framing); 1627 1628 switch (framing) { 1629 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1630 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1631 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1632 break; 1633 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1634 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1635 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 1636 /* These ones are applied in the interrupt handler */ 1637 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ 1638 break; 1639 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1640 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1641 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1642 break; 1643 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: 1644 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1645 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1646 break; 1647 default: 1648 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1649 return -EINVAL; 1650 } 1651 1652 trf->framing = framing; 1653 1654 if (iso_ctrl != trf->iso_ctrl) { 1655 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1656 if (ret) 1657 return ret; 1658 1659 trf->iso_ctrl = iso_ctrl; 1660 1661 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1662 trf->modulator_sys_clk_ctrl); 1663 if (ret) 1664 return ret; 1665 } 1666 1667 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1668 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1669 trf->chip_status_ctrl | 1670 TRF7970A_CHIP_STATUS_RF_ON); 1671 if (ret) 1672 return ret; 1673 1674 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1675 } 1676 1677 return 0; 1678} 1679 1680static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, 1681 int param) 1682{ 1683 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1684 int ret; 1685 1686 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1687 1688 mutex_lock(&trf->lock); 1689 1690 trf->is_initiator = false; 1691 1692 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1693 (trf->state == TRF7970A_ST_RF_OFF)) { 1694 ret = trf7970a_switch_rf_on(trf); 1695 if (ret) 1696 goto err_unlock; 1697 } 1698 1699 switch (type) { 1700 case NFC_DIGITAL_CONFIG_RF_TECH: 1701 ret = trf7970a_tg_config_rf_tech(trf, param); 1702 break; 1703 case NFC_DIGITAL_CONFIG_FRAMING: 1704 ret = trf7970a_tg_config_framing(trf, param); 1705 break; 1706 default: 1707 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1708 ret = -EINVAL; 1709 } 1710 1711err_unlock: 1712 mutex_unlock(&trf->lock); 1713 return ret; 1714} 1715 1716static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1717 nfc_digital_cmd_complete_t cb, void *arg, 1718 bool mode_detect) 1719{ 1720 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1721 int ret; 1722 1723 mutex_lock(&trf->lock); 1724 1725 if ((trf->state != TRF7970A_ST_IDLE) && 1726 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1727 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1728 trf->state); 1729 ret = -EIO; 1730 goto out_err; 1731 } 1732 1733 if (trf->aborting) { 1734 dev_dbg(trf->dev, "Abort process complete\n"); 1735 trf->aborting = false; 1736 ret = -ECANCELED; 1737 goto out_err; 1738 } 1739 1740 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1741 GFP_KERNEL); 1742 if (!trf->rx_skb) { 1743 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1744 ret = -ENOMEM; 1745 goto out_err; 1746 } 1747 1748 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, 1749 TRF7970A_RX_SPECIAL_SETTINGS_HBT | 1750 TRF7970A_RX_SPECIAL_SETTINGS_M848 | 1751 TRF7970A_RX_SPECIAL_SETTINGS_C424 | 1752 TRF7970A_RX_SPECIAL_SETTINGS_C212); 1753 if (ret) 1754 goto out_err; 1755 1756 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1757 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1758 if (ret) 1759 goto out_err; 1760 1761 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, 1762 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); 1763 if (ret) 1764 goto out_err; 1765 1766 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 1767 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); 1768 if (ret) 1769 goto out_err; 1770 1771 trf->ddev = ddev; 1772 trf->cb = cb; 1773 trf->cb_arg = arg; 1774 trf->timeout = timeout; 1775 trf->ignore_timeout = false; 1776 1777 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1778 if (ret) 1779 goto out_err; 1780 1781 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : 1782 TRF7970A_ST_LISTENING; 1783 1784 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 1785 1786out_err: 1787 mutex_unlock(&trf->lock); 1788 return ret; 1789} 1790 1791static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1792 nfc_digital_cmd_complete_t cb, void *arg) 1793{ 1794 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1795 1796 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", 1797 trf->state, timeout); 1798 1799 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); 1800} 1801 1802static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, 1803 u16 timeout, nfc_digital_cmd_complete_t cb, 1804 void *arg) 1805{ 1806 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1807 int ret; 1808 1809 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", 1810 trf->state, timeout); 1811 1812 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, 1813 NFC_DIGITAL_RF_TECH_106A); 1814 if (ret) 1815 return ret; 1816 1817 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, 1818 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); 1819 if (ret) 1820 return ret; 1821 1822 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); 1823} 1824 1825static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) 1826{ 1827 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1828 1829 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", 1830 trf->state, trf->md_rf_tech); 1831 1832 *rf_tech = trf->md_rf_tech; 1833 1834 return 0; 1835} 1836 1837static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) 1838{ 1839 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1840 1841 dev_dbg(trf->dev, "Abort process initiated\n"); 1842 1843 mutex_lock(&trf->lock); 1844 1845 switch (trf->state) { 1846 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1847 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1848 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1849 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1850 trf->aborting = true; 1851 break; 1852 case TRF7970A_ST_LISTENING: 1853 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); 1854 trf7970a_send_err_upstream(trf, -ECANCELED); 1855 dev_dbg(trf->dev, "Abort process complete\n"); 1856 break; 1857 default: 1858 break; 1859 } 1860 1861 mutex_unlock(&trf->lock); 1862} 1863 1864static struct nfc_digital_ops trf7970a_nfc_ops = { 1865 .in_configure_hw = trf7970a_in_configure_hw, 1866 .in_send_cmd = trf7970a_send_cmd, 1867 .tg_configure_hw = trf7970a_tg_configure_hw, 1868 .tg_send_cmd = trf7970a_send_cmd, 1869 .tg_listen = trf7970a_tg_listen, 1870 .tg_listen_md = trf7970a_tg_listen_md, 1871 .tg_get_rf_tech = trf7970a_tg_get_rf_tech, 1872 .switch_rf = trf7970a_switch_rf, 1873 .abort_cmd = trf7970a_abort_cmd, 1874}; 1875 1876static int trf7970a_power_up(struct trf7970a *trf) 1877{ 1878 int ret; 1879 1880 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); 1881 1882 if (trf->state != TRF7970A_ST_PWR_OFF) 1883 return 0; 1884 1885 ret = regulator_enable(trf->regulator); 1886 if (ret) { 1887 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); 1888 return ret; 1889 } 1890 1891 usleep_range(5000, 6000); 1892 1893 if (trf->en2_gpiod && 1894 !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { 1895 gpiod_set_value_cansleep(trf->en2_gpiod, 1); 1896 usleep_range(1000, 2000); 1897 } 1898 1899 gpiod_set_value_cansleep(trf->en_gpiod, 1); 1900 1901 usleep_range(20000, 21000); 1902 1903 trf->state = TRF7970A_ST_RF_OFF; 1904 1905 return 0; 1906} 1907 1908static int trf7970a_power_down(struct trf7970a *trf) 1909{ 1910 int ret; 1911 1912 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); 1913 1914 if (trf->state == TRF7970A_ST_PWR_OFF) 1915 return 0; 1916 1917 if (trf->state != TRF7970A_ST_RF_OFF) { 1918 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", 1919 trf->state); 1920 return -EBUSY; 1921 } 1922 1923 gpiod_set_value_cansleep(trf->en_gpiod, 0); 1924 1925 if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) 1926 gpiod_set_value_cansleep(trf->en2_gpiod, 0); 1927 1928 ret = regulator_disable(trf->regulator); 1929 if (ret) 1930 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, 1931 ret); 1932 1933 trf->state = TRF7970A_ST_PWR_OFF; 1934 1935 return ret; 1936} 1937 1938static int trf7970a_startup(struct trf7970a *trf) 1939{ 1940 int ret; 1941 1942 ret = trf7970a_power_up(trf); 1943 if (ret) 1944 return ret; 1945 1946 pm_runtime_set_active(trf->dev); 1947 pm_runtime_enable(trf->dev); 1948 pm_runtime_mark_last_busy(trf->dev); 1949 1950 return 0; 1951} 1952 1953static void trf7970a_shutdown(struct trf7970a *trf) 1954{ 1955 switch (trf->state) { 1956 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1957 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1958 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1959 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1960 case TRF7970A_ST_LISTENING: 1961 trf7970a_send_err_upstream(trf, -ECANCELED); 1962 fallthrough; 1963 case TRF7970A_ST_IDLE: 1964 case TRF7970A_ST_IDLE_RX_BLOCKED: 1965 trf7970a_switch_rf_off(trf); 1966 break; 1967 default: 1968 break; 1969 } 1970 1971 pm_runtime_disable(trf->dev); 1972 pm_runtime_set_suspended(trf->dev); 1973 1974 trf7970a_power_down(trf); 1975} 1976 1977static int trf7970a_get_autosuspend_delay(struct device_node *np) 1978{ 1979 int autosuspend_delay, ret; 1980 1981 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); 1982 if (ret) 1983 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; 1984 1985 return autosuspend_delay; 1986} 1987 1988static int trf7970a_probe(struct spi_device *spi) 1989{ 1990 struct device_node *np = spi->dev.of_node; 1991 struct trf7970a *trf; 1992 int uvolts, autosuspend_delay, ret; 1993 u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; 1994 1995 if (!np) { 1996 dev_err(&spi->dev, "No Device Tree entry\n"); 1997 return -EINVAL; 1998 } 1999 2000 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); 2001 if (!trf) 2002 return -ENOMEM; 2003 2004 trf->state = TRF7970A_ST_PWR_OFF; 2005 trf->dev = &spi->dev; 2006 trf->spi = spi; 2007 2008 spi->mode = SPI_MODE_1; 2009 spi->bits_per_word = 8; 2010 2011 ret = spi_setup(spi); 2012 if (ret < 0) { 2013 dev_err(trf->dev, "Can't set up SPI Communication\n"); 2014 return ret; 2015 } 2016 2017 if (of_property_read_bool(np, "irq-status-read-quirk")) 2018 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; 2019 2020 /* There are two enable pins - only EN must be present in the DT */ 2021 trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0, 2022 GPIOD_OUT_LOW); 2023 if (IS_ERR(trf->en_gpiod)) { 2024 dev_err(trf->dev, "No EN GPIO property\n"); 2025 return PTR_ERR(trf->en_gpiod); 2026 } 2027 2028 trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1, 2029 GPIOD_OUT_LOW); 2030 if (!trf->en2_gpiod) { 2031 dev_info(trf->dev, "No EN2 GPIO property\n"); 2032 } else if (IS_ERR(trf->en2_gpiod)) { 2033 dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n", 2034 PTR_ERR(trf->en2_gpiod)); 2035 return PTR_ERR(trf->en2_gpiod); 2036 } else if (of_property_read_bool(np, "en2-rf-quirk")) { 2037 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; 2038 } 2039 2040 of_property_read_u32(np, "clock-frequency", &clk_freq); 2041 if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && 2042 (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { 2043 dev_err(trf->dev, 2044 "clock-frequency (%u Hz) unsupported\n", clk_freq); 2045 return -EINVAL; 2046 } 2047 2048 if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) { 2049 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; 2050 dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n"); 2051 } else { 2052 trf->modulator_sys_clk_ctrl = 0; 2053 } 2054 2055 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, 2056 trf7970a_irq, 2057 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 2058 "trf7970a", trf); 2059 if (ret) { 2060 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); 2061 return ret; 2062 } 2063 2064 mutex_init(&trf->lock); 2065 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); 2066 2067 trf->regulator = devm_regulator_get(&spi->dev, "vin"); 2068 if (IS_ERR(trf->regulator)) { 2069 ret = PTR_ERR(trf->regulator); 2070 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); 2071 goto err_destroy_lock; 2072 } 2073 2074 ret = regulator_enable(trf->regulator); 2075 if (ret) { 2076 dev_err(trf->dev, "Can't enable VIN: %d\n", ret); 2077 goto err_destroy_lock; 2078 } 2079 2080 uvolts = regulator_get_voltage(trf->regulator); 2081 if (uvolts > 4000000) 2082 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; 2083 2084 trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); 2085 if (IS_ERR(trf->regulator)) { 2086 ret = PTR_ERR(trf->regulator); 2087 dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); 2088 goto err_destroy_lock; 2089 } 2090 2091 ret = regulator_enable(trf->regulator); 2092 if (ret) { 2093 dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); 2094 goto err_destroy_lock; 2095 } 2096 2097 if (regulator_get_voltage(trf->regulator) == 1800000) { 2098 trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; 2099 dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); 2100 } 2101 2102 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, 2103 TRF7970A_SUPPORTED_PROTOCOLS, 2104 NFC_DIGITAL_DRV_CAPS_IN_CRC | 2105 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 2106 0); 2107 if (!trf->ddev) { 2108 dev_err(trf->dev, "Can't allocate NFC digital device\n"); 2109 ret = -ENOMEM; 2110 goto err_disable_regulator; 2111 } 2112 2113 nfc_digital_set_parent_dev(trf->ddev, trf->dev); 2114 nfc_digital_set_drvdata(trf->ddev, trf); 2115 spi_set_drvdata(spi, trf); 2116 2117 autosuspend_delay = trf7970a_get_autosuspend_delay(np); 2118 2119 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); 2120 pm_runtime_use_autosuspend(trf->dev); 2121 2122 ret = trf7970a_startup(trf); 2123 if (ret) 2124 goto err_free_ddev; 2125 2126 ret = nfc_digital_register_device(trf->ddev); 2127 if (ret) { 2128 dev_err(trf->dev, "Can't register NFC digital device: %d\n", 2129 ret); 2130 goto err_shutdown; 2131 } 2132 2133 return 0; 2134 2135err_shutdown: 2136 trf7970a_shutdown(trf); 2137err_free_ddev: 2138 nfc_digital_free_device(trf->ddev); 2139err_disable_regulator: 2140 regulator_disable(trf->regulator); 2141err_destroy_lock: 2142 mutex_destroy(&trf->lock); 2143 return ret; 2144} 2145 2146static int trf7970a_remove(struct spi_device *spi) 2147{ 2148 struct trf7970a *trf = spi_get_drvdata(spi); 2149 2150 mutex_lock(&trf->lock); 2151 2152 trf7970a_shutdown(trf); 2153 2154 mutex_unlock(&trf->lock); 2155 2156 nfc_digital_unregister_device(trf->ddev); 2157 nfc_digital_free_device(trf->ddev); 2158 2159 regulator_disable(trf->regulator); 2160 2161 mutex_destroy(&trf->lock); 2162 2163 return 0; 2164} 2165 2166#ifdef CONFIG_PM_SLEEP 2167static int trf7970a_suspend(struct device *dev) 2168{ 2169 struct spi_device *spi = to_spi_device(dev); 2170 struct trf7970a *trf = spi_get_drvdata(spi); 2171 2172 dev_dbg(dev, "Suspend\n"); 2173 2174 mutex_lock(&trf->lock); 2175 2176 trf7970a_shutdown(trf); 2177 2178 mutex_unlock(&trf->lock); 2179 2180 return 0; 2181} 2182 2183static int trf7970a_resume(struct device *dev) 2184{ 2185 struct spi_device *spi = to_spi_device(dev); 2186 struct trf7970a *trf = spi_get_drvdata(spi); 2187 int ret; 2188 2189 dev_dbg(dev, "Resume\n"); 2190 2191 mutex_lock(&trf->lock); 2192 2193 ret = trf7970a_startup(trf); 2194 2195 mutex_unlock(&trf->lock); 2196 2197 return ret; 2198} 2199#endif 2200 2201#ifdef CONFIG_PM 2202static int trf7970a_pm_runtime_suspend(struct device *dev) 2203{ 2204 struct spi_device *spi = to_spi_device(dev); 2205 struct trf7970a *trf = spi_get_drvdata(spi); 2206 int ret; 2207 2208 dev_dbg(dev, "Runtime suspend\n"); 2209 2210 mutex_lock(&trf->lock); 2211 2212 ret = trf7970a_power_down(trf); 2213 2214 mutex_unlock(&trf->lock); 2215 2216 return ret; 2217} 2218 2219static int trf7970a_pm_runtime_resume(struct device *dev) 2220{ 2221 struct spi_device *spi = to_spi_device(dev); 2222 struct trf7970a *trf = spi_get_drvdata(spi); 2223 int ret; 2224 2225 dev_dbg(dev, "Runtime resume\n"); 2226 2227 ret = trf7970a_power_up(trf); 2228 if (!ret) 2229 pm_runtime_mark_last_busy(dev); 2230 2231 return ret; 2232} 2233#endif 2234 2235static const struct dev_pm_ops trf7970a_pm_ops = { 2236 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) 2237 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, 2238 trf7970a_pm_runtime_resume, NULL) 2239}; 2240 2241static const struct of_device_id trf7970a_of_match[] = { 2242 {.compatible = "ti,trf7970a",}, 2243 {}, 2244}; 2245 2246MODULE_DEVICE_TABLE(of, trf7970a_of_match); 2247 2248static const struct spi_device_id trf7970a_id_table[] = { 2249 {"trf7970a", 0}, 2250 {} 2251}; 2252 2253MODULE_DEVICE_TABLE(spi, trf7970a_id_table); 2254 2255static struct spi_driver trf7970a_spi_driver = { 2256 .probe = trf7970a_probe, 2257 .remove = trf7970a_remove, 2258 .id_table = trf7970a_id_table, 2259 .driver = { 2260 .name = "trf7970a", 2261 .of_match_table = of_match_ptr(trf7970a_of_match), 2262 .pm = &trf7970a_pm_ops, 2263 }, 2264}; 2265 2266module_spi_driver(trf7970a_spi_driver); 2267 2268MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); 2269MODULE_LICENSE("GPL v2"); 2270MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); 2271