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 register 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) 408 409 enum 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 }; 422 423 struct trf7970a { 424 enum trf7970a_state state; 425 struct device *dev; 426 struct spi_device *spi; 427 struct regulator *vin_regulator; 428 struct regulator *vddio_regulator; 429 struct nfc_digital_dev *ddev; 430 u32 quirks; 431 bool is_initiator; 432 bool aborting; 433 struct sk_buff *tx_skb; 434 struct sk_buff *rx_skb; 435 nfc_digital_cmd_complete_t cb; 436 void *cb_arg; 437 u8 chip_status_ctrl; 438 u8 iso_ctrl; 439 u8 iso_ctrl_tech; 440 u8 modulator_sys_clk_ctrl; 441 u8 special_fcn_reg1; 442 u8 io_ctrl; 443 unsigned int guard_time; 444 int technology; 445 int framing; 446 u8 md_rf_tech; 447 u8 tx_cmd; 448 bool issue_eof; 449 struct gpio_desc *en_gpiod; 450 struct gpio_desc *en2_gpiod; 451 struct mutex lock; 452 unsigned int timeout; 453 bool ignore_timeout; 454 struct delayed_work timeout_work; 455 }; 456 trf7970a_cmd(struct trf7970a * trf,u8 opcode)457 static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) 458 { 459 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); 460 int ret; 461 462 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); 463 464 ret = spi_write(trf->spi, &cmd, 1); 465 if (ret) 466 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, 467 ret); 468 return ret; 469 } 470 trf7970a_read(struct trf7970a * trf,u8 reg,u8 * val)471 static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) 472 { 473 u8 addr = TRF7970A_CMD_BIT_RW | reg; 474 int ret; 475 476 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); 477 if (ret) 478 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 479 ret); 480 481 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); 482 483 return ret; 484 } 485 trf7970a_read_cont(struct trf7970a * trf,u8 reg,u8 * buf,size_t len)486 static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, 487 size_t len) 488 { 489 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; 490 struct spi_transfer t[2]; 491 struct spi_message m; 492 int ret; 493 494 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); 495 496 spi_message_init(&m); 497 498 memset(&t, 0, sizeof(t)); 499 500 t[0].tx_buf = &addr; 501 t[0].len = sizeof(addr); 502 spi_message_add_tail(&t[0], &m); 503 504 t[1].rx_buf = buf; 505 t[1].len = len; 506 spi_message_add_tail(&t[1], &m); 507 508 ret = spi_sync(trf->spi, &m); 509 if (ret) 510 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 511 ret); 512 return ret; 513 } 514 trf7970a_write(struct trf7970a * trf,u8 reg,u8 val)515 static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) 516 { 517 u8 buf[2] = { reg, val }; 518 int ret; 519 520 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); 521 522 ret = spi_write(trf->spi, buf, 2); 523 if (ret) 524 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, 525 buf[0], buf[1], ret); 526 527 return ret; 528 } 529 trf7970a_read_irqstatus(struct trf7970a * trf,u8 * status)530 static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) 531 { 532 int ret; 533 u8 buf[2]; 534 u8 addr; 535 536 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; 537 538 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { 539 addr |= TRF7970A_CMD_BIT_CONTINUOUS; 540 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 541 } else { 542 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); 543 } 544 545 if (ret) 546 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", 547 __func__, ret); 548 else 549 *status = buf[0]; 550 551 return ret; 552 } 553 trf7970a_read_target_proto(struct trf7970a * trf,u8 * target_proto)554 static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) 555 { 556 int ret; 557 u8 buf[2]; 558 u8 addr; 559 560 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | 561 TRF7970A_CMD_BIT_CONTINUOUS; 562 563 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 564 if (ret) 565 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", 566 __func__, ret); 567 else 568 *target_proto = buf[0]; 569 570 return ret; 571 } 572 trf7970a_mode_detect(struct trf7970a * trf,u8 * rf_tech)573 static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) 574 { 575 int ret; 576 u8 target_proto, tech; 577 578 ret = trf7970a_read_target_proto(trf, &target_proto); 579 if (ret) 580 return ret; 581 582 switch (target_proto) { 583 case TRF79070A_NFC_TARGET_PROTOCOL_106A: 584 tech = NFC_DIGITAL_RF_TECH_106A; 585 break; 586 case TRF79070A_NFC_TARGET_PROTOCOL_106B: 587 tech = NFC_DIGITAL_RF_TECH_106B; 588 break; 589 case TRF79070A_NFC_TARGET_PROTOCOL_212F: 590 tech = NFC_DIGITAL_RF_TECH_212F; 591 break; 592 case TRF79070A_NFC_TARGET_PROTOCOL_424F: 593 tech = NFC_DIGITAL_RF_TECH_424F; 594 break; 595 default: 596 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", 597 __func__, target_proto); 598 return -EIO; 599 } 600 601 *rf_tech = tech; 602 603 return ret; 604 } 605 trf7970a_send_upstream(struct trf7970a * trf)606 static void trf7970a_send_upstream(struct trf7970a *trf) 607 { 608 dev_kfree_skb_any(trf->tx_skb); 609 trf->tx_skb = NULL; 610 611 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) 612 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, 613 16, 1, trf->rx_skb->data, trf->rx_skb->len, 614 false); 615 616 trf->state = TRF7970A_ST_IDLE; 617 618 if (trf->aborting) { 619 dev_dbg(trf->dev, "Abort process complete\n"); 620 621 if (!IS_ERR(trf->rx_skb)) { 622 kfree_skb(trf->rx_skb); 623 trf->rx_skb = ERR_PTR(-ECANCELED); 624 } 625 626 trf->aborting = false; 627 } 628 629 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); 630 631 trf->rx_skb = NULL; 632 } 633 trf7970a_send_err_upstream(struct trf7970a * trf,int errno)634 static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) 635 { 636 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); 637 638 cancel_delayed_work(&trf->timeout_work); 639 640 kfree_skb(trf->rx_skb); 641 trf->rx_skb = ERR_PTR(errno); 642 643 trf7970a_send_upstream(trf); 644 } 645 trf7970a_transmit(struct trf7970a * trf,struct sk_buff * skb,unsigned int len,const u8 * prefix,unsigned int prefix_len)646 static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, 647 unsigned int len, const u8 *prefix, 648 unsigned int prefix_len) 649 { 650 struct spi_transfer t[2]; 651 struct spi_message m; 652 unsigned int timeout; 653 int ret; 654 655 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, 656 16, 1, skb->data, len, false); 657 658 spi_message_init(&m); 659 660 memset(&t, 0, sizeof(t)); 661 662 t[0].tx_buf = prefix; 663 t[0].len = prefix_len; 664 spi_message_add_tail(&t[0], &m); 665 666 t[1].tx_buf = skb->data; 667 t[1].len = len; 668 spi_message_add_tail(&t[1], &m); 669 670 ret = spi_sync(trf->spi, &m); 671 if (ret) { 672 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, 673 ret); 674 return ret; 675 } 676 677 skb_pull(skb, len); 678 679 if (skb->len > 0) { 680 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; 681 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; 682 } else { 683 if (trf->issue_eof) { 684 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; 685 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; 686 } else { 687 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 688 689 if (!trf->timeout) 690 timeout = TRF7970A_WAIT_FOR_TX_IRQ; 691 else 692 timeout = trf->timeout; 693 } 694 } 695 696 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, 697 trf->state); 698 699 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 700 701 return 0; 702 } 703 trf7970a_fill_fifo(struct trf7970a * trf)704 static void trf7970a_fill_fifo(struct trf7970a *trf) 705 { 706 struct sk_buff *skb = trf->tx_skb; 707 unsigned int len; 708 int ret; 709 u8 fifo_bytes; 710 u8 prefix; 711 712 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 713 if (ret) { 714 trf7970a_send_err_upstream(trf, ret); 715 return; 716 } 717 718 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 719 720 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 721 722 /* Calculate how much more data can be written to the fifo */ 723 len = TRF7970A_FIFO_SIZE - fifo_bytes; 724 if (!len) { 725 schedule_delayed_work(&trf->timeout_work, 726 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); 727 return; 728 } 729 730 len = min(skb->len, len); 731 732 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; 733 734 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); 735 if (ret) 736 trf7970a_send_err_upstream(trf, ret); 737 } 738 trf7970a_drain_fifo(struct trf7970a * trf,u8 status)739 static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) 740 { 741 struct sk_buff *skb = trf->rx_skb; 742 int ret; 743 u8 fifo_bytes; 744 745 if (status & TRF7970A_IRQ_STATUS_ERROR) { 746 trf7970a_send_err_upstream(trf, -EIO); 747 return; 748 } 749 750 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 751 if (ret) { 752 trf7970a_send_err_upstream(trf, ret); 753 return; 754 } 755 756 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 757 758 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 759 760 if (!fifo_bytes) 761 goto no_rx_data; 762 763 if (fifo_bytes > skb_tailroom(skb)) { 764 skb = skb_copy_expand(skb, skb_headroom(skb), 765 max_t(int, fifo_bytes, 766 TRF7970A_RX_SKB_ALLOC_SIZE), 767 GFP_KERNEL); 768 if (!skb) { 769 trf7970a_send_err_upstream(trf, -ENOMEM); 770 return; 771 } 772 773 kfree_skb(trf->rx_skb); 774 trf->rx_skb = skb; 775 } 776 777 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, 778 skb_put(skb, fifo_bytes), fifo_bytes); 779 if (ret) { 780 trf7970a_send_err_upstream(trf, ret); 781 return; 782 } 783 784 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ 785 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && 786 (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { 787 skb->data[0] >>= 4; 788 status = TRF7970A_IRQ_STATUS_SRX; 789 } else { 790 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; 791 792 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 793 if (ret) { 794 trf7970a_send_err_upstream(trf, ret); 795 return; 796 } 797 798 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 799 800 /* If there are bytes in the FIFO, set status to '0' so 801 * the if stmt below doesn't fire and the driver will wait 802 * for the trf7970a to generate another RX interrupt. 803 */ 804 if (fifo_bytes) 805 status = 0; 806 } 807 808 no_rx_data: 809 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ 810 trf7970a_send_upstream(trf); 811 return; 812 } 813 814 dev_dbg(trf->dev, "Setting timeout for %d ms\n", 815 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); 816 817 schedule_delayed_work(&trf->timeout_work, 818 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); 819 } 820 trf7970a_irq(int irq,void * dev_id)821 static irqreturn_t trf7970a_irq(int irq, void *dev_id) 822 { 823 struct trf7970a *trf = dev_id; 824 int ret; 825 u8 status, fifo_bytes, iso_ctrl; 826 827 mutex_lock(&trf->lock); 828 829 if (trf->state == TRF7970A_ST_RF_OFF) { 830 mutex_unlock(&trf->lock); 831 return IRQ_NONE; 832 } 833 834 ret = trf7970a_read_irqstatus(trf, &status); 835 if (ret) { 836 mutex_unlock(&trf->lock); 837 return IRQ_NONE; 838 } 839 840 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, 841 status); 842 843 if (!status) { 844 mutex_unlock(&trf->lock); 845 return IRQ_NONE; 846 } 847 848 switch (trf->state) { 849 case TRF7970A_ST_IDLE: 850 case TRF7970A_ST_IDLE_RX_BLOCKED: 851 /* If initiator and getting interrupts caused by RF noise, 852 * turn off the receiver to avoid unnecessary interrupts. 853 * It will be turned back on in trf7970a_send_cmd() when 854 * the next command is issued. 855 */ 856 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { 857 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); 858 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; 859 } 860 861 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 862 break; 863 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 864 if (status & TRF7970A_IRQ_STATUS_TX) { 865 trf->ignore_timeout = 866 !cancel_delayed_work(&trf->timeout_work); 867 trf7970a_fill_fifo(trf); 868 } else { 869 trf7970a_send_err_upstream(trf, -EIO); 870 } 871 break; 872 case TRF7970A_ST_WAIT_FOR_RX_DATA: 873 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 874 if (status & TRF7970A_IRQ_STATUS_SRX) { 875 trf->ignore_timeout = 876 !cancel_delayed_work(&trf->timeout_work); 877 trf7970a_drain_fifo(trf, status); 878 } else if (status & TRF7970A_IRQ_STATUS_FIFO) { 879 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, 880 &fifo_bytes); 881 882 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 883 884 if (ret) 885 trf7970a_send_err_upstream(trf, ret); 886 else if (!fifo_bytes) 887 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 888 } else if ((status == TRF7970A_IRQ_STATUS_TX) || 889 (!trf->is_initiator && 890 (status == (TRF7970A_IRQ_STATUS_TX | 891 TRF7970A_IRQ_STATUS_NFC_RF)))) { 892 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 893 894 if (!trf->timeout) { 895 trf->ignore_timeout = 896 !cancel_delayed_work(&trf->timeout_work); 897 trf->rx_skb = ERR_PTR(0); 898 trf7970a_send_upstream(trf); 899 break; 900 } 901 902 if (trf->is_initiator) 903 break; 904 905 iso_ctrl = trf->iso_ctrl; 906 907 switch (trf->framing) { 908 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 909 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 910 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 911 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 912 break; 913 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 914 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 915 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 916 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 917 break; 918 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 919 ret = trf7970a_write(trf, 920 TRF7970A_SPECIAL_FCN_REG1, 921 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); 922 if (ret) 923 goto err_unlock_exit; 924 925 trf->special_fcn_reg1 = 926 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; 927 break; 928 default: 929 break; 930 } 931 932 if (iso_ctrl != trf->iso_ctrl) { 933 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 934 iso_ctrl); 935 if (ret) 936 goto err_unlock_exit; 937 938 trf->iso_ctrl = iso_ctrl; 939 } 940 } else { 941 trf7970a_send_err_upstream(trf, -EIO); 942 } 943 break; 944 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 945 if (status != TRF7970A_IRQ_STATUS_TX) 946 trf7970a_send_err_upstream(trf, -EIO); 947 break; 948 case TRF7970A_ST_LISTENING: 949 if (status & TRF7970A_IRQ_STATUS_SRX) { 950 trf->ignore_timeout = 951 !cancel_delayed_work(&trf->timeout_work); 952 trf7970a_drain_fifo(trf, status); 953 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 954 trf7970a_send_err_upstream(trf, -EIO); 955 } 956 break; 957 case TRF7970A_ST_LISTENING_MD: 958 if (status & TRF7970A_IRQ_STATUS_SRX) { 959 trf->ignore_timeout = 960 !cancel_delayed_work(&trf->timeout_work); 961 962 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); 963 if (ret) { 964 trf7970a_send_err_upstream(trf, ret); 965 } else { 966 trf->state = TRF7970A_ST_LISTENING; 967 trf7970a_drain_fifo(trf, status); 968 } 969 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 970 trf7970a_send_err_upstream(trf, -EIO); 971 } 972 break; 973 default: 974 dev_err(trf->dev, "%s - Driver in invalid state: %d\n", 975 __func__, trf->state); 976 } 977 978 err_unlock_exit: 979 mutex_unlock(&trf->lock); 980 return IRQ_HANDLED; 981 } 982 trf7970a_issue_eof(struct trf7970a * trf)983 static void trf7970a_issue_eof(struct trf7970a *trf) 984 { 985 int ret; 986 987 dev_dbg(trf->dev, "Issuing EOF\n"); 988 989 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 990 if (ret) 991 trf7970a_send_err_upstream(trf, ret); 992 993 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); 994 if (ret) 995 trf7970a_send_err_upstream(trf, ret); 996 997 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 998 999 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", 1000 trf->timeout, trf->state); 1001 1002 schedule_delayed_work(&trf->timeout_work, 1003 msecs_to_jiffies(trf->timeout)); 1004 } 1005 trf7970a_timeout_work_handler(struct work_struct * work)1006 static void trf7970a_timeout_work_handler(struct work_struct *work) 1007 { 1008 struct trf7970a *trf = container_of(work, struct trf7970a, 1009 timeout_work.work); 1010 1011 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", 1012 trf->state, trf->ignore_timeout); 1013 1014 mutex_lock(&trf->lock); 1015 1016 if (trf->ignore_timeout) 1017 trf->ignore_timeout = false; 1018 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) 1019 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); 1020 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) 1021 trf7970a_issue_eof(trf); 1022 else 1023 trf7970a_send_err_upstream(trf, -ETIMEDOUT); 1024 1025 mutex_unlock(&trf->lock); 1026 } 1027 trf7970a_init(struct trf7970a * trf)1028 static int trf7970a_init(struct trf7970a *trf) 1029 { 1030 int ret; 1031 1032 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); 1033 1034 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); 1035 if (ret) 1036 goto err_out; 1037 1038 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); 1039 if (ret) 1040 goto err_out; 1041 1042 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1043 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1044 if (ret) 1045 goto err_out; 1046 1047 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1048 if (ret) 1049 goto err_out; 1050 1051 usleep_range(1000, 2000); 1052 1053 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1054 1055 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1056 trf->modulator_sys_clk_ctrl); 1057 if (ret) 1058 goto err_out; 1059 1060 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, 1061 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | 1062 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); 1063 if (ret) 1064 goto err_out; 1065 1066 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); 1067 if (ret) 1068 goto err_out; 1069 1070 trf->special_fcn_reg1 = 0; 1071 1072 trf->iso_ctrl = 0xff; 1073 return 0; 1074 1075 err_out: 1076 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); 1077 return ret; 1078 } 1079 trf7970a_switch_rf_off(struct trf7970a * trf)1080 static void trf7970a_switch_rf_off(struct trf7970a *trf) 1081 { 1082 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1083 (trf->state == TRF7970A_ST_RF_OFF)) 1084 return; 1085 1086 dev_dbg(trf->dev, "Switching rf off\n"); 1087 1088 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1089 1090 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); 1091 1092 trf->aborting = false; 1093 trf->state = TRF7970A_ST_RF_OFF; 1094 1095 pm_runtime_mark_last_busy(trf->dev); 1096 pm_runtime_put_autosuspend(trf->dev); 1097 } 1098 trf7970a_switch_rf_on(struct trf7970a * trf)1099 static int trf7970a_switch_rf_on(struct trf7970a *trf) 1100 { 1101 int ret; 1102 1103 dev_dbg(trf->dev, "Switching rf on\n"); 1104 1105 pm_runtime_get_sync(trf->dev); 1106 1107 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ 1108 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, 1109 trf->state); 1110 return -EINVAL; 1111 } 1112 1113 ret = trf7970a_init(trf); 1114 if (ret) { 1115 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); 1116 return ret; 1117 } 1118 1119 trf->state = TRF7970A_ST_IDLE; 1120 1121 return 0; 1122 } 1123 trf7970a_switch_rf(struct nfc_digital_dev * ddev,bool on)1124 static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) 1125 { 1126 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1127 int ret = 0; 1128 1129 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); 1130 1131 mutex_lock(&trf->lock); 1132 1133 if (on) { 1134 switch (trf->state) { 1135 case TRF7970A_ST_PWR_OFF: 1136 case TRF7970A_ST_RF_OFF: 1137 ret = trf7970a_switch_rf_on(trf); 1138 break; 1139 case TRF7970A_ST_IDLE: 1140 case TRF7970A_ST_IDLE_RX_BLOCKED: 1141 break; 1142 default: 1143 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1144 __func__, trf->state, on); 1145 trf7970a_switch_rf_off(trf); 1146 ret = -EINVAL; 1147 } 1148 } else { 1149 switch (trf->state) { 1150 case TRF7970A_ST_PWR_OFF: 1151 case TRF7970A_ST_RF_OFF: 1152 break; 1153 default: 1154 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1155 __func__, trf->state, on); 1156 ret = -EINVAL; 1157 fallthrough; 1158 case TRF7970A_ST_IDLE: 1159 case TRF7970A_ST_IDLE_RX_BLOCKED: 1160 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1161 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1162 trf7970a_switch_rf_off(trf); 1163 } 1164 } 1165 1166 mutex_unlock(&trf->lock); 1167 return ret; 1168 } 1169 trf7970a_in_config_rf_tech(struct trf7970a * trf,int tech)1170 static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) 1171 { 1172 int ret = 0; 1173 1174 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1175 1176 switch (tech) { 1177 case NFC_DIGITAL_RF_TECH_106A: 1178 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; 1179 trf->modulator_sys_clk_ctrl = 1180 (trf->modulator_sys_clk_ctrl & 0xf8) | 1181 TRF7970A_MODULATOR_DEPTH_OOK; 1182 trf->guard_time = TRF7970A_GUARD_TIME_NFCA; 1183 break; 1184 case NFC_DIGITAL_RF_TECH_106B: 1185 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; 1186 trf->modulator_sys_clk_ctrl = 1187 (trf->modulator_sys_clk_ctrl & 0xf8) | 1188 TRF7970A_MODULATOR_DEPTH_ASK10; 1189 trf->guard_time = TRF7970A_GUARD_TIME_NFCB; 1190 break; 1191 case NFC_DIGITAL_RF_TECH_212F: 1192 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; 1193 trf->modulator_sys_clk_ctrl = 1194 (trf->modulator_sys_clk_ctrl & 0xf8) | 1195 TRF7970A_MODULATOR_DEPTH_ASK10; 1196 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1197 break; 1198 case NFC_DIGITAL_RF_TECH_424F: 1199 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; 1200 trf->modulator_sys_clk_ctrl = 1201 (trf->modulator_sys_clk_ctrl & 0xf8) | 1202 TRF7970A_MODULATOR_DEPTH_ASK10; 1203 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1204 break; 1205 case NFC_DIGITAL_RF_TECH_ISO15693: 1206 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1207 trf->modulator_sys_clk_ctrl = 1208 (trf->modulator_sys_clk_ctrl & 0xf8) | 1209 TRF7970A_MODULATOR_DEPTH_OOK; 1210 trf->guard_time = TRF7970A_GUARD_TIME_15693; 1211 break; 1212 default: 1213 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1214 return -EINVAL; 1215 } 1216 1217 trf->technology = tech; 1218 1219 /* If in initiator mode and not changing the RF tech due to a 1220 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from 1221 * trf7970a_init()), clear the NFC Target Detection Level register 1222 * due to erratum. 1223 */ 1224 if (trf->iso_ctrl == 0xff) 1225 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1226 1227 return ret; 1228 } 1229 trf7970a_is_rf_field(struct trf7970a * trf,bool * is_rf_field)1230 static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) 1231 { 1232 int ret; 1233 u8 rssi; 1234 1235 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1236 trf->chip_status_ctrl | 1237 TRF7970A_CHIP_STATUS_REC_ON); 1238 if (ret) 1239 return ret; 1240 1241 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); 1242 if (ret) 1243 return ret; 1244 1245 usleep_range(50, 60); 1246 1247 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); 1248 if (ret) 1249 return ret; 1250 1251 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1252 trf->chip_status_ctrl); 1253 if (ret) 1254 return ret; 1255 1256 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) 1257 *is_rf_field = true; 1258 else 1259 *is_rf_field = false; 1260 1261 return 0; 1262 } 1263 trf7970a_in_config_framing(struct trf7970a * trf,int framing)1264 static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) 1265 { 1266 u8 iso_ctrl = trf->iso_ctrl_tech; 1267 bool is_rf_field = false; 1268 int ret; 1269 1270 dev_dbg(trf->dev, "framing: %d\n", framing); 1271 1272 switch (framing) { 1273 case NFC_DIGITAL_FRAMING_NFCA_SHORT: 1274 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1275 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1276 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1277 break; 1278 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1279 case NFC_DIGITAL_FRAMING_NFCA_T4T: 1280 case NFC_DIGITAL_FRAMING_NFCB: 1281 case NFC_DIGITAL_FRAMING_NFCB_T4T: 1282 case NFC_DIGITAL_FRAMING_NFCF: 1283 case NFC_DIGITAL_FRAMING_NFCF_T3T: 1284 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: 1285 case NFC_DIGITAL_FRAMING_ISO15693_T5T: 1286 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1287 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1288 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1289 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1290 break; 1291 case NFC_DIGITAL_FRAMING_NFCA_T2T: 1292 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1293 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1294 break; 1295 default: 1296 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1297 return -EINVAL; 1298 } 1299 1300 trf->framing = framing; 1301 1302 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1303 ret = trf7970a_is_rf_field(trf, &is_rf_field); 1304 if (ret) 1305 return ret; 1306 1307 if (is_rf_field) 1308 return -EBUSY; 1309 } 1310 1311 if (iso_ctrl != trf->iso_ctrl) { 1312 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1313 if (ret) 1314 return ret; 1315 1316 trf->iso_ctrl = iso_ctrl; 1317 1318 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1319 trf->modulator_sys_clk_ctrl); 1320 if (ret) 1321 return ret; 1322 } 1323 1324 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1325 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1326 trf->chip_status_ctrl | 1327 TRF7970A_CHIP_STATUS_RF_ON); 1328 if (ret) 1329 return ret; 1330 1331 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1332 1333 usleep_range(trf->guard_time, trf->guard_time + 1000); 1334 } 1335 1336 return 0; 1337 } 1338 trf7970a_in_configure_hw(struct nfc_digital_dev * ddev,int type,int param)1339 static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, 1340 int param) 1341 { 1342 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1343 int ret; 1344 1345 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1346 1347 mutex_lock(&trf->lock); 1348 1349 trf->is_initiator = true; 1350 1351 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1352 (trf->state == TRF7970A_ST_RF_OFF)) { 1353 ret = trf7970a_switch_rf_on(trf); 1354 if (ret) 1355 goto err_unlock; 1356 } 1357 1358 switch (type) { 1359 case NFC_DIGITAL_CONFIG_RF_TECH: 1360 ret = trf7970a_in_config_rf_tech(trf, param); 1361 break; 1362 case NFC_DIGITAL_CONFIG_FRAMING: 1363 ret = trf7970a_in_config_framing(trf, param); 1364 break; 1365 default: 1366 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1367 ret = -EINVAL; 1368 } 1369 1370 err_unlock: 1371 mutex_unlock(&trf->lock); 1372 return ret; 1373 } 1374 trf7970a_is_iso15693_write_or_lock(u8 cmd)1375 static int trf7970a_is_iso15693_write_or_lock(u8 cmd) 1376 { 1377 switch (cmd) { 1378 case ISO15693_CMD_WRITE_SINGLE_BLOCK: 1379 case ISO15693_CMD_LOCK_BLOCK: 1380 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: 1381 case ISO15693_CMD_WRITE_AFI: 1382 case ISO15693_CMD_LOCK_AFI: 1383 case ISO15693_CMD_WRITE_DSFID: 1384 case ISO15693_CMD_LOCK_DSFID: 1385 return 1; 1386 default: 1387 return 0; 1388 } 1389 } 1390 trf7970a_per_cmd_config(struct trf7970a * trf,const struct sk_buff * skb)1391 static int trf7970a_per_cmd_config(struct trf7970a *trf, 1392 const struct sk_buff *skb) 1393 { 1394 const u8 *req = skb->data; 1395 u8 special_fcn_reg1, iso_ctrl; 1396 int ret; 1397 1398 trf->issue_eof = false; 1399 1400 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in 1401 * special functions register 1 is cleared; otherwise, its a write or 1402 * sector select command and '4_bit_RX' must be set. 1403 * 1404 * When issuing an ISO 15693 command, inspect the flags byte to see 1405 * what speed to use. Also, remember if the OPTION flag is set on 1406 * a Type 5 write or lock command so the driver will know that it 1407 * has to send an EOF in order to get a response. 1408 */ 1409 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && 1410 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { 1411 if (req[0] == NFC_T2T_CMD_READ) 1412 special_fcn_reg1 = 0; 1413 else 1414 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; 1415 1416 if (special_fcn_reg1 != trf->special_fcn_reg1) { 1417 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 1418 special_fcn_reg1); 1419 if (ret) 1420 return ret; 1421 1422 trf->special_fcn_reg1 = special_fcn_reg1; 1423 } 1424 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { 1425 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; 1426 1427 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { 1428 case 0x00: 1429 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; 1430 break; 1431 case ISO15693_REQ_FLAG_SUB_CARRIER: 1432 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; 1433 break; 1434 case ISO15693_REQ_FLAG_DATA_RATE: 1435 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1436 break; 1437 case (ISO15693_REQ_FLAG_SUB_CARRIER | 1438 ISO15693_REQ_FLAG_DATA_RATE): 1439 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; 1440 break; 1441 } 1442 1443 if (iso_ctrl != trf->iso_ctrl) { 1444 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1445 if (ret) 1446 return ret; 1447 1448 trf->iso_ctrl = iso_ctrl; 1449 } 1450 1451 if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && 1452 trf7970a_is_iso15693_write_or_lock(req[1]) && 1453 (req[0] & ISO15693_REQ_FLAG_OPTION)) 1454 trf->issue_eof = true; 1455 } 1456 1457 return 0; 1458 } 1459 trf7970a_send_cmd(struct nfc_digital_dev * ddev,struct sk_buff * skb,u16 timeout,nfc_digital_cmd_complete_t cb,void * arg)1460 static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, 1461 struct sk_buff *skb, u16 timeout, 1462 nfc_digital_cmd_complete_t cb, void *arg) 1463 { 1464 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1465 u8 prefix[5]; 1466 unsigned int len; 1467 int ret; 1468 u8 status; 1469 1470 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", 1471 trf->state, timeout, skb->len); 1472 1473 if (skb->len > TRF7970A_TX_MAX) 1474 return -EINVAL; 1475 1476 mutex_lock(&trf->lock); 1477 1478 if ((trf->state != TRF7970A_ST_IDLE) && 1479 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1480 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1481 trf->state); 1482 ret = -EIO; 1483 goto out_err; 1484 } 1485 1486 if (trf->aborting) { 1487 dev_dbg(trf->dev, "Abort process complete\n"); 1488 trf->aborting = false; 1489 ret = -ECANCELED; 1490 goto out_err; 1491 } 1492 1493 if (timeout) { 1494 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1495 GFP_KERNEL); 1496 if (!trf->rx_skb) { 1497 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1498 ret = -ENOMEM; 1499 goto out_err; 1500 } 1501 } 1502 1503 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { 1504 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1505 if (ret) 1506 goto out_err; 1507 1508 trf->state = TRF7970A_ST_IDLE; 1509 } 1510 1511 if (trf->is_initiator) { 1512 ret = trf7970a_per_cmd_config(trf, skb); 1513 if (ret) 1514 goto out_err; 1515 } 1516 1517 trf->ddev = ddev; 1518 trf->tx_skb = skb; 1519 trf->cb = cb; 1520 trf->cb_arg = arg; 1521 trf->timeout = timeout; 1522 trf->ignore_timeout = false; 1523 1524 len = skb->len; 1525 1526 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends 1527 * on what the current framing is, the address of the TX length byte 1 1528 * register (0x1d), and the 2 byte length of the data to be transmitted. 1529 * That totals 5 bytes. 1530 */ 1531 prefix[0] = TRF7970A_CMD_BIT_CTRL | 1532 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); 1533 prefix[1] = TRF7970A_CMD_BIT_CTRL | 1534 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); 1535 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; 1536 1537 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { 1538 prefix[3] = 0x00; 1539 prefix[4] = 0x0f; /* 7 bits */ 1540 } else { 1541 prefix[3] = (len & 0xf00) >> 4; 1542 prefix[3] |= ((len & 0xf0) >> 4); 1543 prefix[4] = ((len & 0x0f) << 4); 1544 } 1545 1546 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); 1547 1548 /* Clear possible spurious interrupt */ 1549 ret = trf7970a_read_irqstatus(trf, &status); 1550 if (ret) 1551 goto out_err; 1552 1553 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); 1554 if (ret) { 1555 kfree_skb(trf->rx_skb); 1556 trf->rx_skb = NULL; 1557 } 1558 1559 out_err: 1560 mutex_unlock(&trf->lock); 1561 return ret; 1562 } 1563 trf7970a_tg_config_rf_tech(struct trf7970a * trf,int tech)1564 static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) 1565 { 1566 int ret = 0; 1567 1568 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1569 1570 switch (tech) { 1571 case NFC_DIGITAL_RF_TECH_106A: 1572 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1573 TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; 1574 trf->modulator_sys_clk_ctrl = 1575 (trf->modulator_sys_clk_ctrl & 0xf8) | 1576 TRF7970A_MODULATOR_DEPTH_OOK; 1577 break; 1578 case NFC_DIGITAL_RF_TECH_212F: 1579 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1580 TRF7970A_ISO_CTRL_NFC_NFCF_212; 1581 trf->modulator_sys_clk_ctrl = 1582 (trf->modulator_sys_clk_ctrl & 0xf8) | 1583 TRF7970A_MODULATOR_DEPTH_ASK10; 1584 break; 1585 case NFC_DIGITAL_RF_TECH_424F: 1586 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1587 TRF7970A_ISO_CTRL_NFC_NFCF_424; 1588 trf->modulator_sys_clk_ctrl = 1589 (trf->modulator_sys_clk_ctrl & 0xf8) | 1590 TRF7970A_MODULATOR_DEPTH_ASK10; 1591 break; 1592 default: 1593 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1594 return -EINVAL; 1595 } 1596 1597 trf->technology = tech; 1598 1599 /* Normally we write the ISO_CTRL register in 1600 * trf7970a_tg_config_framing() because the framing can change 1601 * the value written. However, when sending a PSL RES, 1602 * digital_tg_send_psl_res_complete() doesn't call 1603 * trf7970a_tg_config_framing() so we must write the register 1604 * here. 1605 */ 1606 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && 1607 (trf->iso_ctrl_tech != trf->iso_ctrl)) { 1608 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 1609 trf->iso_ctrl_tech); 1610 1611 trf->iso_ctrl = trf->iso_ctrl_tech; 1612 } 1613 1614 return ret; 1615 } 1616 1617 /* Since this is a target routine, several of the framing calls are 1618 * made between receiving the request and sending the response so they 1619 * should take effect until after the response is sent. This is accomplished 1620 * by skipping the ISO_CTRL register write here and doing it in the interrupt 1621 * handler. 1622 */ trf7970a_tg_config_framing(struct trf7970a * trf,int framing)1623 static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) 1624 { 1625 u8 iso_ctrl = trf->iso_ctrl_tech; 1626 int ret; 1627 1628 dev_dbg(trf->dev, "framing: %d\n", framing); 1629 1630 switch (framing) { 1631 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1632 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1633 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1634 break; 1635 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1636 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1637 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 1638 /* These ones are applied in the interrupt handler */ 1639 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ 1640 break; 1641 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1642 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1643 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1644 break; 1645 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: 1646 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1647 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1648 break; 1649 default: 1650 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1651 return -EINVAL; 1652 } 1653 1654 trf->framing = framing; 1655 1656 if (iso_ctrl != trf->iso_ctrl) { 1657 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1658 if (ret) 1659 return ret; 1660 1661 trf->iso_ctrl = iso_ctrl; 1662 1663 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1664 trf->modulator_sys_clk_ctrl); 1665 if (ret) 1666 return ret; 1667 } 1668 1669 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1670 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1671 trf->chip_status_ctrl | 1672 TRF7970A_CHIP_STATUS_RF_ON); 1673 if (ret) 1674 return ret; 1675 1676 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1677 } 1678 1679 return 0; 1680 } 1681 trf7970a_tg_configure_hw(struct nfc_digital_dev * ddev,int type,int param)1682 static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, 1683 int param) 1684 { 1685 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1686 int ret; 1687 1688 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1689 1690 mutex_lock(&trf->lock); 1691 1692 trf->is_initiator = false; 1693 1694 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1695 (trf->state == TRF7970A_ST_RF_OFF)) { 1696 ret = trf7970a_switch_rf_on(trf); 1697 if (ret) 1698 goto err_unlock; 1699 } 1700 1701 switch (type) { 1702 case NFC_DIGITAL_CONFIG_RF_TECH: 1703 ret = trf7970a_tg_config_rf_tech(trf, param); 1704 break; 1705 case NFC_DIGITAL_CONFIG_FRAMING: 1706 ret = trf7970a_tg_config_framing(trf, param); 1707 break; 1708 default: 1709 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1710 ret = -EINVAL; 1711 } 1712 1713 err_unlock: 1714 mutex_unlock(&trf->lock); 1715 return ret; 1716 } 1717 _trf7970a_tg_listen(struct nfc_digital_dev * ddev,u16 timeout,nfc_digital_cmd_complete_t cb,void * arg,bool mode_detect)1718 static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1719 nfc_digital_cmd_complete_t cb, void *arg, 1720 bool mode_detect) 1721 { 1722 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1723 int ret; 1724 1725 mutex_lock(&trf->lock); 1726 1727 if ((trf->state != TRF7970A_ST_IDLE) && 1728 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1729 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1730 trf->state); 1731 ret = -EIO; 1732 goto out_err; 1733 } 1734 1735 if (trf->aborting) { 1736 dev_dbg(trf->dev, "Abort process complete\n"); 1737 trf->aborting = false; 1738 ret = -ECANCELED; 1739 goto out_err; 1740 } 1741 1742 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1743 GFP_KERNEL); 1744 if (!trf->rx_skb) { 1745 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1746 ret = -ENOMEM; 1747 goto out_err; 1748 } 1749 1750 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, 1751 TRF7970A_RX_SPECIAL_SETTINGS_HBT | 1752 TRF7970A_RX_SPECIAL_SETTINGS_M848 | 1753 TRF7970A_RX_SPECIAL_SETTINGS_C424 | 1754 TRF7970A_RX_SPECIAL_SETTINGS_C212); 1755 if (ret) 1756 goto out_err; 1757 1758 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1759 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1760 if (ret) 1761 goto out_err; 1762 1763 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, 1764 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); 1765 if (ret) 1766 goto out_err; 1767 1768 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 1769 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); 1770 if (ret) 1771 goto out_err; 1772 1773 trf->ddev = ddev; 1774 trf->cb = cb; 1775 trf->cb_arg = arg; 1776 trf->timeout = timeout; 1777 trf->ignore_timeout = false; 1778 1779 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1780 if (ret) 1781 goto out_err; 1782 1783 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : 1784 TRF7970A_ST_LISTENING; 1785 1786 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 1787 1788 out_err: 1789 mutex_unlock(&trf->lock); 1790 return ret; 1791 } 1792 trf7970a_tg_listen(struct nfc_digital_dev * ddev,u16 timeout,nfc_digital_cmd_complete_t cb,void * arg)1793 static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1794 nfc_digital_cmd_complete_t cb, void *arg) 1795 { 1796 const struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1797 1798 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", 1799 trf->state, timeout); 1800 1801 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); 1802 } 1803 trf7970a_tg_listen_md(struct nfc_digital_dev * ddev,u16 timeout,nfc_digital_cmd_complete_t cb,void * arg)1804 static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, 1805 u16 timeout, nfc_digital_cmd_complete_t cb, 1806 void *arg) 1807 { 1808 const struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1809 int ret; 1810 1811 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", 1812 trf->state, timeout); 1813 1814 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, 1815 NFC_DIGITAL_RF_TECH_106A); 1816 if (ret) 1817 return ret; 1818 1819 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, 1820 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); 1821 if (ret) 1822 return ret; 1823 1824 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); 1825 } 1826 trf7970a_tg_get_rf_tech(struct nfc_digital_dev * ddev,u8 * rf_tech)1827 static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) 1828 { 1829 const struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1830 1831 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", 1832 trf->state, trf->md_rf_tech); 1833 1834 *rf_tech = trf->md_rf_tech; 1835 1836 return 0; 1837 } 1838 trf7970a_abort_cmd(struct nfc_digital_dev * ddev)1839 static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) 1840 { 1841 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1842 1843 dev_dbg(trf->dev, "Abort process initiated\n"); 1844 1845 mutex_lock(&trf->lock); 1846 1847 switch (trf->state) { 1848 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1849 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1850 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1851 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1852 trf->aborting = true; 1853 break; 1854 case TRF7970A_ST_LISTENING: 1855 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); 1856 trf7970a_send_err_upstream(trf, -ECANCELED); 1857 dev_dbg(trf->dev, "Abort process complete\n"); 1858 break; 1859 default: 1860 break; 1861 } 1862 1863 mutex_unlock(&trf->lock); 1864 } 1865 1866 static const struct nfc_digital_ops trf7970a_nfc_ops = { 1867 .in_configure_hw = trf7970a_in_configure_hw, 1868 .in_send_cmd = trf7970a_send_cmd, 1869 .tg_configure_hw = trf7970a_tg_configure_hw, 1870 .tg_send_cmd = trf7970a_send_cmd, 1871 .tg_listen = trf7970a_tg_listen, 1872 .tg_listen_md = trf7970a_tg_listen_md, 1873 .tg_get_rf_tech = trf7970a_tg_get_rf_tech, 1874 .switch_rf = trf7970a_switch_rf, 1875 .abort_cmd = trf7970a_abort_cmd, 1876 }; 1877 trf7970a_power_up(struct trf7970a * trf)1878 static int trf7970a_power_up(struct trf7970a *trf) 1879 { 1880 int ret; 1881 1882 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); 1883 1884 if (trf->state != TRF7970A_ST_PWR_OFF) 1885 return 0; 1886 1887 ret = regulator_enable(trf->vin_regulator); 1888 if (ret) { 1889 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); 1890 return ret; 1891 } 1892 1893 usleep_range(5000, 6000); 1894 1895 if (trf->en2_gpiod && 1896 !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { 1897 gpiod_set_value_cansleep(trf->en2_gpiod, 1); 1898 usleep_range(1000, 2000); 1899 } 1900 1901 gpiod_set_value_cansleep(trf->en_gpiod, 1); 1902 1903 usleep_range(20000, 21000); 1904 1905 trf->state = TRF7970A_ST_RF_OFF; 1906 1907 return 0; 1908 } 1909 trf7970a_power_down(struct trf7970a * trf)1910 static int trf7970a_power_down(struct trf7970a *trf) 1911 { 1912 int ret; 1913 1914 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); 1915 1916 if (trf->state == TRF7970A_ST_PWR_OFF) 1917 return 0; 1918 1919 if (trf->state != TRF7970A_ST_RF_OFF) { 1920 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", 1921 trf->state); 1922 return -EBUSY; 1923 } 1924 1925 gpiod_set_value_cansleep(trf->en_gpiod, 0); 1926 1927 if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) 1928 gpiod_set_value_cansleep(trf->en2_gpiod, 0); 1929 1930 ret = regulator_disable(trf->vin_regulator); 1931 if (ret) 1932 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, 1933 ret); 1934 1935 trf->state = TRF7970A_ST_PWR_OFF; 1936 1937 return ret; 1938 } 1939 trf7970a_startup(struct trf7970a * trf)1940 static int trf7970a_startup(struct trf7970a *trf) 1941 { 1942 int ret; 1943 1944 ret = trf7970a_power_up(trf); 1945 if (ret) 1946 return ret; 1947 1948 pm_runtime_set_active(trf->dev); 1949 pm_runtime_enable(trf->dev); 1950 pm_runtime_mark_last_busy(trf->dev); 1951 1952 return 0; 1953 } 1954 trf7970a_shutdown(struct trf7970a * trf)1955 static void trf7970a_shutdown(struct trf7970a *trf) 1956 { 1957 switch (trf->state) { 1958 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1959 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1960 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1961 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1962 case TRF7970A_ST_LISTENING: 1963 trf7970a_send_err_upstream(trf, -ECANCELED); 1964 fallthrough; 1965 case TRF7970A_ST_IDLE: 1966 case TRF7970A_ST_IDLE_RX_BLOCKED: 1967 trf7970a_switch_rf_off(trf); 1968 break; 1969 default: 1970 break; 1971 } 1972 1973 pm_runtime_disable(trf->dev); 1974 pm_runtime_set_suspended(trf->dev); 1975 1976 trf7970a_power_down(trf); 1977 } 1978 trf7970a_get_autosuspend_delay(const struct device_node * np)1979 static int trf7970a_get_autosuspend_delay(const struct device_node *np) 1980 { 1981 int autosuspend_delay, ret; 1982 1983 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); 1984 if (ret) 1985 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; 1986 1987 return autosuspend_delay; 1988 } 1989 trf7970a_probe(struct spi_device * spi)1990 static int trf7970a_probe(struct spi_device *spi) 1991 { 1992 const struct device_node *np = spi->dev.of_node; 1993 struct trf7970a *trf; 1994 int uvolts, autosuspend_delay, ret; 1995 u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; 1996 1997 if (!np) { 1998 dev_err(&spi->dev, "No Device Tree entry\n"); 1999 return -EINVAL; 2000 } 2001 2002 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); 2003 if (!trf) 2004 return -ENOMEM; 2005 2006 trf->state = TRF7970A_ST_PWR_OFF; 2007 trf->dev = &spi->dev; 2008 trf->spi = spi; 2009 2010 spi->mode = SPI_MODE_1; 2011 spi->bits_per_word = 8; 2012 2013 ret = spi_setup(spi); 2014 if (ret < 0) { 2015 dev_err(trf->dev, "Can't set up SPI Communication\n"); 2016 return ret; 2017 } 2018 2019 if (of_property_read_bool(np, "irq-status-read-quirk")) 2020 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; 2021 2022 /* There are two enable pins - only EN must be present in the DT */ 2023 trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0, 2024 GPIOD_OUT_LOW); 2025 if (IS_ERR(trf->en_gpiod)) { 2026 dev_err(trf->dev, "No EN GPIO property\n"); 2027 return PTR_ERR(trf->en_gpiod); 2028 } 2029 2030 trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1, 2031 GPIOD_OUT_LOW); 2032 if (!trf->en2_gpiod) { 2033 dev_info(trf->dev, "No EN2 GPIO property\n"); 2034 } else if (IS_ERR(trf->en2_gpiod)) { 2035 dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n", 2036 PTR_ERR(trf->en2_gpiod)); 2037 return PTR_ERR(trf->en2_gpiod); 2038 } else if (of_property_read_bool(np, "en2-rf-quirk")) { 2039 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; 2040 } 2041 2042 of_property_read_u32(np, "clock-frequency", &clk_freq); 2043 if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && 2044 (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { 2045 dev_err(trf->dev, 2046 "clock-frequency (%u Hz) unsupported\n", clk_freq); 2047 return -EINVAL; 2048 } 2049 2050 if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) { 2051 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; 2052 dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n"); 2053 } else { 2054 trf->modulator_sys_clk_ctrl = 0; 2055 } 2056 2057 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, 2058 trf7970a_irq, 2059 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 2060 "trf7970a", trf); 2061 if (ret) { 2062 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); 2063 return ret; 2064 } 2065 2066 mutex_init(&trf->lock); 2067 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); 2068 2069 trf->vin_regulator = devm_regulator_get(&spi->dev, "vin"); 2070 if (IS_ERR(trf->vin_regulator)) { 2071 ret = PTR_ERR(trf->vin_regulator); 2072 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); 2073 goto err_destroy_lock; 2074 } 2075 2076 ret = regulator_enable(trf->vin_regulator); 2077 if (ret) { 2078 dev_err(trf->dev, "Can't enable VIN: %d\n", ret); 2079 goto err_destroy_lock; 2080 } 2081 2082 uvolts = regulator_get_voltage(trf->vin_regulator); 2083 if (uvolts > 4000000) 2084 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; 2085 2086 trf->vddio_regulator = devm_regulator_get(&spi->dev, "vdd-io"); 2087 if (IS_ERR(trf->vddio_regulator)) { 2088 ret = PTR_ERR(trf->vddio_regulator); 2089 dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); 2090 goto err_disable_vin_regulator; 2091 } 2092 2093 ret = regulator_enable(trf->vddio_regulator); 2094 if (ret) { 2095 dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); 2096 goto err_disable_vin_regulator; 2097 } 2098 2099 if (regulator_get_voltage(trf->vddio_regulator) == 1800000) { 2100 trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; 2101 dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); 2102 } 2103 2104 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, 2105 TRF7970A_SUPPORTED_PROTOCOLS, 2106 NFC_DIGITAL_DRV_CAPS_IN_CRC | 2107 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 2108 0); 2109 if (!trf->ddev) { 2110 dev_err(trf->dev, "Can't allocate NFC digital device\n"); 2111 ret = -ENOMEM; 2112 goto err_disable_vddio_regulator; 2113 } 2114 2115 nfc_digital_set_parent_dev(trf->ddev, trf->dev); 2116 nfc_digital_set_drvdata(trf->ddev, trf); 2117 spi_set_drvdata(spi, trf); 2118 2119 autosuspend_delay = trf7970a_get_autosuspend_delay(np); 2120 2121 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); 2122 pm_runtime_use_autosuspend(trf->dev); 2123 2124 ret = trf7970a_startup(trf); 2125 if (ret) 2126 goto err_free_ddev; 2127 2128 ret = nfc_digital_register_device(trf->ddev); 2129 if (ret) { 2130 dev_err(trf->dev, "Can't register NFC digital device: %d\n", 2131 ret); 2132 goto err_shutdown; 2133 } 2134 2135 return 0; 2136 2137 err_shutdown: 2138 trf7970a_shutdown(trf); 2139 err_free_ddev: 2140 nfc_digital_free_device(trf->ddev); 2141 err_disable_vddio_regulator: 2142 regulator_disable(trf->vddio_regulator); 2143 err_disable_vin_regulator: 2144 regulator_disable(trf->vin_regulator); 2145 err_destroy_lock: 2146 mutex_destroy(&trf->lock); 2147 return ret; 2148 } 2149 trf7970a_remove(struct spi_device * spi)2150 static void trf7970a_remove(struct spi_device *spi) 2151 { 2152 struct trf7970a *trf = spi_get_drvdata(spi); 2153 2154 mutex_lock(&trf->lock); 2155 2156 trf7970a_shutdown(trf); 2157 2158 mutex_unlock(&trf->lock); 2159 2160 nfc_digital_unregister_device(trf->ddev); 2161 nfc_digital_free_device(trf->ddev); 2162 2163 regulator_disable(trf->vddio_regulator); 2164 regulator_disable(trf->vin_regulator); 2165 2166 mutex_destroy(&trf->lock); 2167 } 2168 2169 #ifdef CONFIG_PM_SLEEP trf7970a_suspend(struct device * dev)2170 static int trf7970a_suspend(struct device *dev) 2171 { 2172 struct spi_device *spi = to_spi_device(dev); 2173 struct trf7970a *trf = spi_get_drvdata(spi); 2174 2175 mutex_lock(&trf->lock); 2176 2177 trf7970a_shutdown(trf); 2178 2179 mutex_unlock(&trf->lock); 2180 2181 return 0; 2182 } 2183 trf7970a_resume(struct device * dev)2184 static int trf7970a_resume(struct device *dev) 2185 { 2186 struct spi_device *spi = to_spi_device(dev); 2187 struct trf7970a *trf = spi_get_drvdata(spi); 2188 int ret; 2189 2190 mutex_lock(&trf->lock); 2191 2192 ret = trf7970a_startup(trf); 2193 2194 mutex_unlock(&trf->lock); 2195 2196 return ret; 2197 } 2198 #endif 2199 2200 #ifdef CONFIG_PM trf7970a_pm_runtime_suspend(struct device * dev)2201 static int trf7970a_pm_runtime_suspend(struct device *dev) 2202 { 2203 struct spi_device *spi = to_spi_device(dev); 2204 struct trf7970a *trf = spi_get_drvdata(spi); 2205 int ret; 2206 2207 mutex_lock(&trf->lock); 2208 2209 ret = trf7970a_power_down(trf); 2210 2211 mutex_unlock(&trf->lock); 2212 2213 return ret; 2214 } 2215 trf7970a_pm_runtime_resume(struct device * dev)2216 static int trf7970a_pm_runtime_resume(struct device *dev) 2217 { 2218 struct spi_device *spi = to_spi_device(dev); 2219 struct trf7970a *trf = spi_get_drvdata(spi); 2220 int ret; 2221 2222 ret = trf7970a_power_up(trf); 2223 if (!ret) 2224 pm_runtime_mark_last_busy(dev); 2225 2226 return ret; 2227 } 2228 #endif 2229 2230 static const struct dev_pm_ops trf7970a_pm_ops = { 2231 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) 2232 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, 2233 trf7970a_pm_runtime_resume, NULL) 2234 }; 2235 2236 static const struct of_device_id trf7970a_of_match[] __maybe_unused = { 2237 {.compatible = "ti,trf7970a",}, 2238 {}, 2239 }; 2240 2241 MODULE_DEVICE_TABLE(of, trf7970a_of_match); 2242 2243 static const struct spi_device_id trf7970a_id_table[] = { 2244 {"trf7970a", 0}, 2245 {} 2246 }; 2247 2248 MODULE_DEVICE_TABLE(spi, trf7970a_id_table); 2249 2250 static struct spi_driver trf7970a_spi_driver = { 2251 .probe = trf7970a_probe, 2252 .remove = trf7970a_remove, 2253 .id_table = trf7970a_id_table, 2254 .driver = { 2255 .name = "trf7970a", 2256 .of_match_table = of_match_ptr(trf7970a_of_match), 2257 .pm = &trf7970a_pm_ops, 2258 }, 2259 }; 2260 2261 module_spi_driver(trf7970a_spi_driver); 2262 2263 MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); 2264 MODULE_LICENSE("GPL v2"); 2265 MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); 2266