1 /* 2 * TI TRF7970a RFID/NFC Transceiver Driver 3 * 4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 5 * 6 * Author: Erick Macias <emacias@ti.com> 7 * Author: Felipe Balbi <balbi@ti.com> 8 * Author: Mark A. Greer <mgreer@animalcreek.com> 9 * 10 * This program is free software: you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 of 12 * the License as published by the Free Software Foundation. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/device.h> 17 #include <linux/netdevice.h> 18 #include <linux/interrupt.h> 19 #include <linux/pm_runtime.h> 20 #include <linux/nfc.h> 21 #include <linux/skbuff.h> 22 #include <linux/delay.h> 23 #include <linux/gpio/consumer.h> 24 #include <linux/of.h> 25 #include <linux/spi/spi.h> 26 #include <linux/regulator/consumer.h> 27 28 #include <net/nfc/nfc.h> 29 #include <net/nfc/digital.h> 30 31 /* There are 3 ways the host can communicate with the trf7970a: 32 * parallel mode, SPI with Slave Select (SS) mode, and SPI without 33 * SS mode. The driver only supports the two SPI modes. 34 * 35 * The trf7970a is very timing sensitive and the VIN, EN2, and EN 36 * pins must asserted in that order and with specific delays in between. 37 * The delays used in the driver were provided by TI and have been 38 * confirmed to work with this driver. There is a bug with the current 39 * version of the trf7970a that requires that EN2 remain low no matter 40 * what. If it goes high, it will generate an RF field even when in 41 * passive target mode. TI has indicated that the chip will work okay 42 * when EN2 is left low. The 'en2-rf-quirk' device tree property 43 * indicates that trf7970a currently being used has the erratum and 44 * that EN2 must be kept low. 45 * 46 * Timeouts are implemented using the delayed workqueue kernel facility. 47 * Timeouts are required so things don't hang when there is no response 48 * from the trf7970a (or tag). Using this mechanism creates a race with 49 * interrupts, however. That is, an interrupt and a timeout could occur 50 * closely enough together that one is blocked by the mutex while the other 51 * executes. When the timeout handler executes first and blocks the 52 * interrupt handler, it will eventually set the state to IDLE so the 53 * interrupt handler will check the state and exit with no harm done. 54 * When the interrupt handler executes first and blocks the timeout handler, 55 * the cancel_delayed_work() call will know that it didn't cancel the 56 * work item (i.e., timeout) and will return zero. That return code is 57 * used by the timer handler to indicate that it should ignore the timeout 58 * once its unblocked. 59 * 60 * Aborting an active command isn't as simple as it seems because the only 61 * way to abort a command that's already been sent to the tag is so turn 62 * off power to the tag. If we do that, though, we'd have to go through 63 * the entire anticollision procedure again but the digital layer doesn't 64 * support that. So, if an abort is received before trf7970a_send_cmd() 65 * has sent the command to the tag, it simply returns -ECANCELED. If the 66 * command has already been sent to the tag, then the driver continues 67 * normally and recieves the response data (or error) but just before 68 * sending the data upstream, it frees the rx_skb and sends -ECANCELED 69 * upstream instead. If the command failed, that error will be sent 70 * upstream. 71 * 72 * When recieving data from a tag and the interrupt status register has 73 * only the SRX bit set, it means that all of the data has been received 74 * (once what's in the fifo has been read). However, depending on timing 75 * an interrupt status with only the SRX bit set may not be recived. In 76 * those cases, the timeout mechanism is used to wait 20 ms in case more 77 * data arrives. After 20 ms, it is assumed that all of the data has been 78 * received and the accumulated rx data is sent upstream. The 79 * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose 80 * (i.e., it indicates that some data has been received but we're not sure 81 * if there is more coming so a timeout in this state means all data has 82 * been received and there isn't an error). The delay is 20 ms since delays 83 * of ~16 ms have been observed during testing. 84 * 85 * When transmitting a frame larger than the FIFO size (127 bytes), the 86 * driver will wait 20 ms for the FIFO to drain past the low-watermark 87 * and generate an interrupt. The low-watermark set to 32 bytes so the 88 * interrupt should fire after 127 - 32 = 95 bytes have been sent. At 89 * the lowest possible bit rate (6.62 kbps for 15693), it will take up 90 * to ~14.35 ms so 20 ms is used for the timeout. 91 * 92 * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. 93 * Having only 4 bits in the FIFO won't normally generate an interrupt so 94 * driver enables the '4_bit_RX' bit of the Special Functions register 1 95 * to cause an interrupt in that case. Leaving that bit for a read command 96 * messes up the data returned so it is only enabled when the framing is 97 * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. 98 * Unfortunately, that means that the driver has to peek into tx frames 99 * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by 100 * the trf7970a_per_cmd_config() routine. 101 * 102 * ISO/IEC 15693 frames specify whether to use single or double sub-carrier 103 * frequencies and whether to use low or high data rates in the flags byte 104 * of the frame. This means that the driver has to peek at all 15693 frames 105 * to determine what speed to set the communication to. In addition, write 106 * and lock commands use the OPTION flag to indicate that an EOF must be 107 * sent to the tag before it will send its response. So the driver has to 108 * examine all frames for that reason too. 109 * 110 * It is unclear how long to wait before sending the EOF. According to the 111 * Note under Table 1-1 in section 1.6 of 112 * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least 113 * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long 114 * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain 115 * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to 116 * ensure the wait is long enough before sending the EOF. This seems to work 117 * reliably. 118 */ 119 120 #define TRF7970A_SUPPORTED_PROTOCOLS \ 121 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ 122 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ 123 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) 124 125 #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ 126 #define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 127 #define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 128 129 #define TRF7970A_RX_SKB_ALLOC_SIZE 256 130 131 #define TRF7970A_FIFO_SIZE 127 132 133 /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ 134 #define TRF7970A_TX_MAX (4096 - 1) 135 136 #define TRF7970A_WAIT_FOR_TX_IRQ 20 137 #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 138 #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 139 #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 140 141 /* Guard times for various RF technologies (in us) */ 142 #define TRF7970A_GUARD_TIME_NFCA 5000 143 #define TRF7970A_GUARD_TIME_NFCB 5000 144 #define TRF7970A_GUARD_TIME_NFCF 20000 145 #define TRF7970A_GUARD_TIME_15693 1000 146 147 /* Quirks */ 148 /* Erratum: When reading IRQ Status register on trf7970a, we must issue a 149 * read continuous command for IRQ Status and Collision Position registers. 150 */ 151 #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) 152 #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) 153 154 /* Direct commands */ 155 #define TRF7970A_CMD_IDLE 0x00 156 #define TRF7970A_CMD_SOFT_INIT 0x03 157 #define TRF7970A_CMD_RF_COLLISION 0x04 158 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 159 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 160 #define TRF7970A_CMD_FIFO_RESET 0x0f 161 #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 162 #define TRF7970A_CMD_TRANSMIT 0x11 163 #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 164 #define TRF7970A_CMD_DELAY_TRANSMIT 0x13 165 #define TRF7970A_CMD_EOF 0x14 166 #define TRF7970A_CMD_CLOSE_SLOT 0x15 167 #define TRF7970A_CMD_BLOCK_RX 0x16 168 #define TRF7970A_CMD_ENABLE_RX 0x17 169 #define TRF7970A_CMD_TEST_INT_RF 0x18 170 #define TRF7970A_CMD_TEST_EXT_RF 0x19 171 #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a 172 173 /* Bits determining whether its a direct command or register R/W, 174 * whether to use a continuous SPI transaction or not, and the actual 175 * direct cmd opcode or regster address. 176 */ 177 #define TRF7970A_CMD_BIT_CTRL BIT(7) 178 #define TRF7970A_CMD_BIT_RW BIT(6) 179 #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) 180 #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) 181 182 /* Registers addresses */ 183 #define TRF7970A_CHIP_STATUS_CTRL 0x00 184 #define TRF7970A_ISO_CTRL 0x01 185 #define TRF7970A_ISO14443B_TX_OPTIONS 0x02 186 #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 187 #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 188 #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 189 #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 190 #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 191 #define TRF7970A_RX_WAIT_TIME 0x08 192 #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 193 #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a 194 #define TRF7970A_REG_IO_CTRL 0x0b 195 #define TRF7970A_IRQ_STATUS 0x0c 196 #define TRF7970A_COLLISION_IRQ_MASK 0x0d 197 #define TRF7970A_COLLISION_POSITION 0x0e 198 #define TRF7970A_RSSI_OSC_STATUS 0x0f 199 #define TRF7970A_SPECIAL_FCN_REG1 0x10 200 #define TRF7970A_SPECIAL_FCN_REG2 0x11 201 #define TRF7970A_RAM1 0x12 202 #define TRF7970A_RAM2 0x13 203 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 204 #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 205 #define TRF7970A_NFCID1 0x17 206 #define TRF7970A_NFC_TARGET_LEVEL 0x18 207 #define TRF79070A_NFC_TARGET_PROTOCOL 0x19 208 #define TRF7970A_TEST_REGISTER1 0x1a 209 #define TRF7970A_TEST_REGISTER2 0x1b 210 #define TRF7970A_FIFO_STATUS 0x1c 211 #define TRF7970A_TX_LENGTH_BYTE1 0x1d 212 #define TRF7970A_TX_LENGTH_BYTE2 0x1e 213 #define TRF7970A_FIFO_IO_REGISTER 0x1f 214 215 /* Chip Status Control Register Bits */ 216 #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) 217 #define TRF7970A_CHIP_STATUS_REC_ON BIT(1) 218 #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) 219 #define TRF7970A_CHIP_STATUS_PM_ON BIT(3) 220 #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) 221 #define TRF7970A_CHIP_STATUS_RF_ON BIT(5) 222 #define TRF7970A_CHIP_STATUS_DIRECT BIT(6) 223 #define TRF7970A_CHIP_STATUS_STBY BIT(7) 224 225 /* ISO Control Register Bits */ 226 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 227 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 228 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 229 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 230 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 231 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 232 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 233 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 234 #define TRF7970A_ISO_CTRL_14443A_106 0x08 235 #define TRF7970A_ISO_CTRL_14443A_212 0x09 236 #define TRF7970A_ISO_CTRL_14443A_424 0x0a 237 #define TRF7970A_ISO_CTRL_14443A_848 0x0b 238 #define TRF7970A_ISO_CTRL_14443B_106 0x0c 239 #define TRF7970A_ISO_CTRL_14443B_212 0x0d 240 #define TRF7970A_ISO_CTRL_14443B_424 0x0e 241 #define TRF7970A_ISO_CTRL_14443B_848 0x0f 242 #define TRF7970A_ISO_CTRL_FELICA_212 0x1a 243 #define TRF7970A_ISO_CTRL_FELICA_424 0x1b 244 #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 245 #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 246 #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 247 #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 248 #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 249 #define TRF7970A_ISO_CTRL_NFC_CE BIT(2) 250 #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) 251 #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) 252 #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) 253 #define TRF7970A_ISO_CTRL_RFID BIT(5) 254 #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) 255 #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ 256 257 #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f 258 259 /* Modulator and SYS_CLK Control Register Bits */ 260 #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) 261 #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) 262 #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) 263 #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) 264 #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) 265 #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) 266 #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) 267 #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) 268 #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) 269 #define TRF7970A_MODULATOR_EN_ANA BIT(3) 270 #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) 271 #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) 272 #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) 273 #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) 274 #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) 275 #define TRF7970A_MODULATOR_EN_OOK BIT(6) 276 #define TRF7970A_MODULATOR_27MHZ BIT(7) 277 278 #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) 279 #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) 280 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) 281 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) 282 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) 283 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) 284 #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) 285 #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) 286 #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) 287 #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) 288 289 #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) 290 #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) 291 #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) 292 #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) 293 294 /* IRQ Status Register Bits */ 295 #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ 296 #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) 297 #define TRF7970A_IRQ_STATUS_COL BIT(1) 298 #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) 299 #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) 300 #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) 301 #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) 302 #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) 303 #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) 304 #define TRF7970A_IRQ_STATUS_FIFO BIT(5) 305 #define TRF7970A_IRQ_STATUS_SRX BIT(6) 306 #define TRF7970A_IRQ_STATUS_TX BIT(7) 307 308 #define TRF7970A_IRQ_STATUS_ERROR \ 309 (TRF7970A_IRQ_STATUS_COL | \ 310 TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ 311 TRF7970A_IRQ_STATUS_PARITY_ERROR | \ 312 TRF7970A_IRQ_STATUS_CRC_ERROR) 313 314 #define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0)) 315 #define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3)) 316 #define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6) 317 318 #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) 319 #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) 320 #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) 321 #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) 322 #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) 323 #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) 324 325 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) 326 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) 327 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) 328 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) 329 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 330 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 331 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 332 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 333 334 #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) 335 #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) 336 337 #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) 338 #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) 339 #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) 340 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) 341 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) 342 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) 343 344 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) 345 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) 346 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) 347 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) 348 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) 349 #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) 350 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) 351 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) 352 353 #define TRF79070A_NFC_TARGET_PROTOCOL_106A \ 354 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 355 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 356 TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ 357 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) 358 359 #define TRF79070A_NFC_TARGET_PROTOCOL_106B \ 360 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 361 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 362 TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ 363 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) 364 365 #define TRF79070A_NFC_TARGET_PROTOCOL_212F \ 366 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 367 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 368 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ 369 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) 370 371 #define TRF79070A_NFC_TARGET_PROTOCOL_424F \ 372 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ 373 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ 374 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ 375 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) 376 377 #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) 378 379 /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ 380 #define NFC_T2T_CMD_READ 0x30 381 382 /* ISO 15693 commands codes */ 383 #define ISO15693_CMD_INVENTORY 0x01 384 #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 385 #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 386 #define ISO15693_CMD_LOCK_BLOCK 0x22 387 #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 388 #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 389 #define ISO15693_CMD_SELECT 0x25 390 #define ISO15693_CMD_RESET_TO_READY 0x26 391 #define ISO15693_CMD_WRITE_AFI 0x27 392 #define ISO15693_CMD_LOCK_AFI 0x28 393 #define ISO15693_CMD_WRITE_DSFID 0x29 394 #define ISO15693_CMD_LOCK_DSFID 0x2a 395 #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b 396 #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c 397 398 /* ISO 15693 request and response flags */ 399 #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) 400 #define ISO15693_REQ_FLAG_DATA_RATE BIT(1) 401 #define ISO15693_REQ_FLAG_INVENTORY BIT(2) 402 #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) 403 #define ISO15693_REQ_FLAG_SELECT BIT(4) 404 #define ISO15693_REQ_FLAG_AFI BIT(4) 405 #define ISO15693_REQ_FLAG_ADDRESS BIT(5) 406 #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) 407 #define ISO15693_REQ_FLAG_OPTION BIT(6) 408 409 #define ISO15693_REQ_FLAG_SPEED_MASK \ 410 (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) 411 412 enum trf7970a_state { 413 TRF7970A_ST_PWR_OFF, 414 TRF7970A_ST_RF_OFF, 415 TRF7970A_ST_IDLE, 416 TRF7970A_ST_IDLE_RX_BLOCKED, 417 TRF7970A_ST_WAIT_FOR_TX_FIFO, 418 TRF7970A_ST_WAIT_FOR_RX_DATA, 419 TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, 420 TRF7970A_ST_WAIT_TO_ISSUE_EOF, 421 TRF7970A_ST_LISTENING, 422 TRF7970A_ST_LISTENING_MD, 423 TRF7970A_ST_MAX 424 }; 425 426 struct trf7970a { 427 enum trf7970a_state state; 428 struct device *dev; 429 struct spi_device *spi; 430 struct regulator *regulator; 431 struct nfc_digital_dev *ddev; 432 u32 quirks; 433 bool is_initiator; 434 bool aborting; 435 struct sk_buff *tx_skb; 436 struct sk_buff *rx_skb; 437 nfc_digital_cmd_complete_t cb; 438 void *cb_arg; 439 u8 chip_status_ctrl; 440 u8 iso_ctrl; 441 u8 iso_ctrl_tech; 442 u8 modulator_sys_clk_ctrl; 443 u8 special_fcn_reg1; 444 u8 io_ctrl; 445 unsigned int guard_time; 446 int technology; 447 int framing; 448 u8 md_rf_tech; 449 u8 tx_cmd; 450 bool issue_eof; 451 struct gpio_desc *en_gpiod; 452 struct gpio_desc *en2_gpiod; 453 struct mutex lock; 454 unsigned int timeout; 455 bool ignore_timeout; 456 struct delayed_work timeout_work; 457 }; 458 459 static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) 460 { 461 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); 462 int ret; 463 464 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); 465 466 ret = spi_write(trf->spi, &cmd, 1); 467 if (ret) 468 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, 469 ret); 470 return ret; 471 } 472 473 static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) 474 { 475 u8 addr = TRF7970A_CMD_BIT_RW | reg; 476 int ret; 477 478 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); 479 if (ret) 480 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 481 ret); 482 483 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); 484 485 return ret; 486 } 487 488 static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, 489 size_t len) 490 { 491 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; 492 struct spi_transfer t[2]; 493 struct spi_message m; 494 int ret; 495 496 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); 497 498 spi_message_init(&m); 499 500 memset(&t, 0, sizeof(t)); 501 502 t[0].tx_buf = &addr; 503 t[0].len = sizeof(addr); 504 spi_message_add_tail(&t[0], &m); 505 506 t[1].rx_buf = buf; 507 t[1].len = len; 508 spi_message_add_tail(&t[1], &m); 509 510 ret = spi_sync(trf->spi, &m); 511 if (ret) 512 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 513 ret); 514 return ret; 515 } 516 517 static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) 518 { 519 u8 buf[2] = { reg, val }; 520 int ret; 521 522 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); 523 524 ret = spi_write(trf->spi, buf, 2); 525 if (ret) 526 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, 527 buf[0], buf[1], ret); 528 529 return ret; 530 } 531 532 static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) 533 { 534 int ret; 535 u8 buf[2]; 536 u8 addr; 537 538 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; 539 540 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { 541 addr |= TRF7970A_CMD_BIT_CONTINUOUS; 542 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 543 } else { 544 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); 545 } 546 547 if (ret) 548 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", 549 __func__, ret); 550 else 551 *status = buf[0]; 552 553 return ret; 554 } 555 556 static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) 557 { 558 int ret; 559 u8 buf[2]; 560 u8 addr; 561 562 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | 563 TRF7970A_CMD_BIT_CONTINUOUS; 564 565 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); 566 if (ret) 567 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", 568 __func__, ret); 569 else 570 *target_proto = buf[0]; 571 572 return ret; 573 } 574 575 static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) 576 { 577 int ret; 578 u8 target_proto, tech; 579 580 ret = trf7970a_read_target_proto(trf, &target_proto); 581 if (ret) 582 return ret; 583 584 switch (target_proto) { 585 case TRF79070A_NFC_TARGET_PROTOCOL_106A: 586 tech = NFC_DIGITAL_RF_TECH_106A; 587 break; 588 case TRF79070A_NFC_TARGET_PROTOCOL_106B: 589 tech = NFC_DIGITAL_RF_TECH_106B; 590 break; 591 case TRF79070A_NFC_TARGET_PROTOCOL_212F: 592 tech = NFC_DIGITAL_RF_TECH_212F; 593 break; 594 case TRF79070A_NFC_TARGET_PROTOCOL_424F: 595 tech = NFC_DIGITAL_RF_TECH_424F; 596 break; 597 default: 598 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", 599 __func__, target_proto); 600 return -EIO; 601 } 602 603 *rf_tech = tech; 604 605 return ret; 606 } 607 608 static void trf7970a_send_upstream(struct trf7970a *trf) 609 { 610 dev_kfree_skb_any(trf->tx_skb); 611 trf->tx_skb = NULL; 612 613 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) 614 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, 615 16, 1, trf->rx_skb->data, trf->rx_skb->len, 616 false); 617 618 trf->state = TRF7970A_ST_IDLE; 619 620 if (trf->aborting) { 621 dev_dbg(trf->dev, "Abort process complete\n"); 622 623 if (!IS_ERR(trf->rx_skb)) { 624 kfree_skb(trf->rx_skb); 625 trf->rx_skb = ERR_PTR(-ECANCELED); 626 } 627 628 trf->aborting = false; 629 } 630 631 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); 632 633 trf->rx_skb = NULL; 634 } 635 636 static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) 637 { 638 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); 639 640 cancel_delayed_work(&trf->timeout_work); 641 642 kfree_skb(trf->rx_skb); 643 trf->rx_skb = ERR_PTR(errno); 644 645 trf7970a_send_upstream(trf); 646 } 647 648 static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, 649 unsigned int len, u8 *prefix, 650 unsigned int prefix_len) 651 { 652 struct spi_transfer t[2]; 653 struct spi_message m; 654 unsigned int timeout; 655 int ret; 656 657 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, 658 16, 1, skb->data, len, false); 659 660 spi_message_init(&m); 661 662 memset(&t, 0, sizeof(t)); 663 664 t[0].tx_buf = prefix; 665 t[0].len = prefix_len; 666 spi_message_add_tail(&t[0], &m); 667 668 t[1].tx_buf = skb->data; 669 t[1].len = len; 670 spi_message_add_tail(&t[1], &m); 671 672 ret = spi_sync(trf->spi, &m); 673 if (ret) { 674 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, 675 ret); 676 return ret; 677 } 678 679 skb_pull(skb, len); 680 681 if (skb->len > 0) { 682 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; 683 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; 684 } else { 685 if (trf->issue_eof) { 686 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; 687 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; 688 } else { 689 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 690 691 if (!trf->timeout) 692 timeout = TRF7970A_WAIT_FOR_TX_IRQ; 693 else 694 timeout = trf->timeout; 695 } 696 } 697 698 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, 699 trf->state); 700 701 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 702 703 return 0; 704 } 705 706 static void trf7970a_fill_fifo(struct trf7970a *trf) 707 { 708 struct sk_buff *skb = trf->tx_skb; 709 unsigned int len; 710 int ret; 711 u8 fifo_bytes; 712 u8 prefix; 713 714 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 715 if (ret) { 716 trf7970a_send_err_upstream(trf, ret); 717 return; 718 } 719 720 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 721 722 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 723 724 /* Calculate how much more data can be written to the fifo */ 725 len = TRF7970A_FIFO_SIZE - fifo_bytes; 726 if (!len) { 727 schedule_delayed_work(&trf->timeout_work, 728 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); 729 return; 730 } 731 732 len = min(skb->len, len); 733 734 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; 735 736 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); 737 if (ret) 738 trf7970a_send_err_upstream(trf, ret); 739 } 740 741 static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) 742 { 743 struct sk_buff *skb = trf->rx_skb; 744 int ret; 745 u8 fifo_bytes; 746 747 if (status & TRF7970A_IRQ_STATUS_ERROR) { 748 trf7970a_send_err_upstream(trf, -EIO); 749 return; 750 } 751 752 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 753 if (ret) { 754 trf7970a_send_err_upstream(trf, ret); 755 return; 756 } 757 758 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 759 760 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 761 762 if (!fifo_bytes) 763 goto no_rx_data; 764 765 if (fifo_bytes > skb_tailroom(skb)) { 766 skb = skb_copy_expand(skb, skb_headroom(skb), 767 max_t(int, fifo_bytes, 768 TRF7970A_RX_SKB_ALLOC_SIZE), 769 GFP_KERNEL); 770 if (!skb) { 771 trf7970a_send_err_upstream(trf, -ENOMEM); 772 return; 773 } 774 775 kfree_skb(trf->rx_skb); 776 trf->rx_skb = skb; 777 } 778 779 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, 780 skb_put(skb, fifo_bytes), fifo_bytes); 781 if (ret) { 782 trf7970a_send_err_upstream(trf, ret); 783 return; 784 } 785 786 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ 787 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && 788 (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { 789 skb->data[0] >>= 4; 790 status = TRF7970A_IRQ_STATUS_SRX; 791 } else { 792 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; 793 794 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 795 if (ret) { 796 trf7970a_send_err_upstream(trf, ret); 797 return; 798 } 799 800 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 801 802 /* If there are bytes in the FIFO, set status to '0' so 803 * the if stmt below doesn't fire and the driver will wait 804 * for the trf7970a to generate another RX interrupt. 805 */ 806 if (fifo_bytes) 807 status = 0; 808 } 809 810 no_rx_data: 811 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ 812 trf7970a_send_upstream(trf); 813 return; 814 } 815 816 dev_dbg(trf->dev, "Setting timeout for %d ms\n", 817 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); 818 819 schedule_delayed_work(&trf->timeout_work, 820 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); 821 } 822 823 static irqreturn_t trf7970a_irq(int irq, void *dev_id) 824 { 825 struct trf7970a *trf = dev_id; 826 int ret; 827 u8 status, fifo_bytes, iso_ctrl; 828 829 mutex_lock(&trf->lock); 830 831 if (trf->state == TRF7970A_ST_RF_OFF) { 832 mutex_unlock(&trf->lock); 833 return IRQ_NONE; 834 } 835 836 ret = trf7970a_read_irqstatus(trf, &status); 837 if (ret) { 838 mutex_unlock(&trf->lock); 839 return IRQ_NONE; 840 } 841 842 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, 843 status); 844 845 if (!status) { 846 mutex_unlock(&trf->lock); 847 return IRQ_NONE; 848 } 849 850 switch (trf->state) { 851 case TRF7970A_ST_IDLE: 852 case TRF7970A_ST_IDLE_RX_BLOCKED: 853 /* If initiator and getting interrupts caused by RF noise, 854 * turn off the receiver to avoid unnecessary interrupts. 855 * It will be turned back on in trf7970a_send_cmd() when 856 * the next command is issued. 857 */ 858 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { 859 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); 860 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; 861 } 862 863 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 864 break; 865 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 866 if (status & TRF7970A_IRQ_STATUS_TX) { 867 trf->ignore_timeout = 868 !cancel_delayed_work(&trf->timeout_work); 869 trf7970a_fill_fifo(trf); 870 } else { 871 trf7970a_send_err_upstream(trf, -EIO); 872 } 873 break; 874 case TRF7970A_ST_WAIT_FOR_RX_DATA: 875 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 876 if (status & TRF7970A_IRQ_STATUS_SRX) { 877 trf->ignore_timeout = 878 !cancel_delayed_work(&trf->timeout_work); 879 trf7970a_drain_fifo(trf, status); 880 } else if (status & TRF7970A_IRQ_STATUS_FIFO) { 881 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, 882 &fifo_bytes); 883 884 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 885 886 if (ret) 887 trf7970a_send_err_upstream(trf, ret); 888 else if (!fifo_bytes) 889 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 890 } else if ((status == TRF7970A_IRQ_STATUS_TX) || 891 (!trf->is_initiator && 892 (status == (TRF7970A_IRQ_STATUS_TX | 893 TRF7970A_IRQ_STATUS_NFC_RF)))) { 894 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 895 896 if (!trf->timeout) { 897 trf->ignore_timeout = 898 !cancel_delayed_work(&trf->timeout_work); 899 trf->rx_skb = ERR_PTR(0); 900 trf7970a_send_upstream(trf); 901 break; 902 } 903 904 if (trf->is_initiator) 905 break; 906 907 iso_ctrl = trf->iso_ctrl; 908 909 switch (trf->framing) { 910 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 911 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 912 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 913 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 914 break; 915 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 916 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 917 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 918 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 919 break; 920 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 921 ret = trf7970a_write(trf, 922 TRF7970A_SPECIAL_FCN_REG1, 923 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); 924 if (ret) 925 goto err_unlock_exit; 926 927 trf->special_fcn_reg1 = 928 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; 929 break; 930 default: 931 break; 932 } 933 934 if (iso_ctrl != trf->iso_ctrl) { 935 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 936 iso_ctrl); 937 if (ret) 938 goto err_unlock_exit; 939 940 trf->iso_ctrl = iso_ctrl; 941 } 942 } else { 943 trf7970a_send_err_upstream(trf, -EIO); 944 } 945 break; 946 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 947 if (status != TRF7970A_IRQ_STATUS_TX) 948 trf7970a_send_err_upstream(trf, -EIO); 949 break; 950 case TRF7970A_ST_LISTENING: 951 if (status & TRF7970A_IRQ_STATUS_SRX) { 952 trf->ignore_timeout = 953 !cancel_delayed_work(&trf->timeout_work); 954 trf7970a_drain_fifo(trf, status); 955 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 956 trf7970a_send_err_upstream(trf, -EIO); 957 } 958 break; 959 case TRF7970A_ST_LISTENING_MD: 960 if (status & TRF7970A_IRQ_STATUS_SRX) { 961 trf->ignore_timeout = 962 !cancel_delayed_work(&trf->timeout_work); 963 964 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); 965 if (ret) { 966 trf7970a_send_err_upstream(trf, ret); 967 } else { 968 trf->state = TRF7970A_ST_LISTENING; 969 trf7970a_drain_fifo(trf, status); 970 } 971 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 972 trf7970a_send_err_upstream(trf, -EIO); 973 } 974 break; 975 default: 976 dev_err(trf->dev, "%s - Driver in invalid state: %d\n", 977 __func__, trf->state); 978 } 979 980 err_unlock_exit: 981 mutex_unlock(&trf->lock); 982 return IRQ_HANDLED; 983 } 984 985 static void trf7970a_issue_eof(struct trf7970a *trf) 986 { 987 int ret; 988 989 dev_dbg(trf->dev, "Issuing EOF\n"); 990 991 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 992 if (ret) 993 trf7970a_send_err_upstream(trf, ret); 994 995 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); 996 if (ret) 997 trf7970a_send_err_upstream(trf, ret); 998 999 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 1000 1001 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", 1002 trf->timeout, trf->state); 1003 1004 schedule_delayed_work(&trf->timeout_work, 1005 msecs_to_jiffies(trf->timeout)); 1006 } 1007 1008 static void trf7970a_timeout_work_handler(struct work_struct *work) 1009 { 1010 struct trf7970a *trf = container_of(work, struct trf7970a, 1011 timeout_work.work); 1012 1013 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", 1014 trf->state, trf->ignore_timeout); 1015 1016 mutex_lock(&trf->lock); 1017 1018 if (trf->ignore_timeout) 1019 trf->ignore_timeout = false; 1020 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) 1021 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); 1022 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) 1023 trf7970a_issue_eof(trf); 1024 else 1025 trf7970a_send_err_upstream(trf, -ETIMEDOUT); 1026 1027 mutex_unlock(&trf->lock); 1028 } 1029 1030 static int trf7970a_init(struct trf7970a *trf) 1031 { 1032 int ret; 1033 1034 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); 1035 1036 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); 1037 if (ret) 1038 goto err_out; 1039 1040 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); 1041 if (ret) 1042 goto err_out; 1043 1044 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1045 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1046 if (ret) 1047 goto err_out; 1048 1049 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1050 if (ret) 1051 goto err_out; 1052 1053 usleep_range(1000, 2000); 1054 1055 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1056 1057 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1058 trf->modulator_sys_clk_ctrl); 1059 if (ret) 1060 goto err_out; 1061 1062 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, 1063 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | 1064 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); 1065 if (ret) 1066 goto err_out; 1067 1068 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); 1069 if (ret) 1070 goto err_out; 1071 1072 trf->special_fcn_reg1 = 0; 1073 1074 trf->iso_ctrl = 0xff; 1075 return 0; 1076 1077 err_out: 1078 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); 1079 return ret; 1080 } 1081 1082 static void trf7970a_switch_rf_off(struct trf7970a *trf) 1083 { 1084 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1085 (trf->state == TRF7970A_ST_RF_OFF)) 1086 return; 1087 1088 dev_dbg(trf->dev, "Switching rf off\n"); 1089 1090 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1091 1092 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); 1093 1094 trf->aborting = false; 1095 trf->state = TRF7970A_ST_RF_OFF; 1096 1097 pm_runtime_mark_last_busy(trf->dev); 1098 pm_runtime_put_autosuspend(trf->dev); 1099 } 1100 1101 static int trf7970a_switch_rf_on(struct trf7970a *trf) 1102 { 1103 int ret; 1104 1105 dev_dbg(trf->dev, "Switching rf on\n"); 1106 1107 pm_runtime_get_sync(trf->dev); 1108 1109 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ 1110 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, 1111 trf->state); 1112 return -EINVAL; 1113 } 1114 1115 ret = trf7970a_init(trf); 1116 if (ret) { 1117 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); 1118 return ret; 1119 } 1120 1121 trf->state = TRF7970A_ST_IDLE; 1122 1123 return 0; 1124 } 1125 1126 static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) 1127 { 1128 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1129 int ret = 0; 1130 1131 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); 1132 1133 mutex_lock(&trf->lock); 1134 1135 if (on) { 1136 switch (trf->state) { 1137 case TRF7970A_ST_PWR_OFF: 1138 case TRF7970A_ST_RF_OFF: 1139 ret = trf7970a_switch_rf_on(trf); 1140 break; 1141 case TRF7970A_ST_IDLE: 1142 case TRF7970A_ST_IDLE_RX_BLOCKED: 1143 break; 1144 default: 1145 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1146 __func__, trf->state, on); 1147 trf7970a_switch_rf_off(trf); 1148 ret = -EINVAL; 1149 } 1150 } else { 1151 switch (trf->state) { 1152 case TRF7970A_ST_PWR_OFF: 1153 case TRF7970A_ST_RF_OFF: 1154 break; 1155 default: 1156 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1157 __func__, trf->state, on); 1158 ret = -EINVAL; 1159 /* FALLTHROUGH */ 1160 case TRF7970A_ST_IDLE: 1161 case TRF7970A_ST_IDLE_RX_BLOCKED: 1162 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1163 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1164 trf7970a_switch_rf_off(trf); 1165 } 1166 } 1167 1168 mutex_unlock(&trf->lock); 1169 return ret; 1170 } 1171 1172 static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) 1173 { 1174 int ret = 0; 1175 1176 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1177 1178 switch (tech) { 1179 case NFC_DIGITAL_RF_TECH_106A: 1180 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; 1181 trf->modulator_sys_clk_ctrl = 1182 (trf->modulator_sys_clk_ctrl & 0xf8) | 1183 TRF7970A_MODULATOR_DEPTH_OOK; 1184 trf->guard_time = TRF7970A_GUARD_TIME_NFCA; 1185 break; 1186 case NFC_DIGITAL_RF_TECH_106B: 1187 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; 1188 trf->modulator_sys_clk_ctrl = 1189 (trf->modulator_sys_clk_ctrl & 0xf8) | 1190 TRF7970A_MODULATOR_DEPTH_ASK10; 1191 trf->guard_time = TRF7970A_GUARD_TIME_NFCB; 1192 break; 1193 case NFC_DIGITAL_RF_TECH_212F: 1194 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; 1195 trf->modulator_sys_clk_ctrl = 1196 (trf->modulator_sys_clk_ctrl & 0xf8) | 1197 TRF7970A_MODULATOR_DEPTH_ASK10; 1198 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1199 break; 1200 case NFC_DIGITAL_RF_TECH_424F: 1201 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; 1202 trf->modulator_sys_clk_ctrl = 1203 (trf->modulator_sys_clk_ctrl & 0xf8) | 1204 TRF7970A_MODULATOR_DEPTH_ASK10; 1205 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1206 break; 1207 case NFC_DIGITAL_RF_TECH_ISO15693: 1208 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1209 trf->modulator_sys_clk_ctrl = 1210 (trf->modulator_sys_clk_ctrl & 0xf8) | 1211 TRF7970A_MODULATOR_DEPTH_OOK; 1212 trf->guard_time = TRF7970A_GUARD_TIME_15693; 1213 break; 1214 default: 1215 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1216 return -EINVAL; 1217 } 1218 1219 trf->technology = tech; 1220 1221 /* If in initiator mode and not changing the RF tech due to a 1222 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from 1223 * trf7970a_init()), clear the NFC Target Detection Level register 1224 * due to erratum. 1225 */ 1226 if (trf->iso_ctrl == 0xff) 1227 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1228 1229 return ret; 1230 } 1231 1232 static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) 1233 { 1234 int ret; 1235 u8 rssi; 1236 1237 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1238 trf->chip_status_ctrl | 1239 TRF7970A_CHIP_STATUS_REC_ON); 1240 if (ret) 1241 return ret; 1242 1243 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); 1244 if (ret) 1245 return ret; 1246 1247 usleep_range(50, 60); 1248 1249 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); 1250 if (ret) 1251 return ret; 1252 1253 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1254 trf->chip_status_ctrl); 1255 if (ret) 1256 return ret; 1257 1258 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) 1259 *is_rf_field = true; 1260 else 1261 *is_rf_field = false; 1262 1263 return 0; 1264 } 1265 1266 static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) 1267 { 1268 u8 iso_ctrl = trf->iso_ctrl_tech; 1269 bool is_rf_field = false; 1270 int ret; 1271 1272 dev_dbg(trf->dev, "framing: %d\n", framing); 1273 1274 switch (framing) { 1275 case NFC_DIGITAL_FRAMING_NFCA_SHORT: 1276 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1277 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1278 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1279 break; 1280 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1281 case NFC_DIGITAL_FRAMING_NFCA_T4T: 1282 case NFC_DIGITAL_FRAMING_NFCB: 1283 case NFC_DIGITAL_FRAMING_NFCB_T4T: 1284 case NFC_DIGITAL_FRAMING_NFCF: 1285 case NFC_DIGITAL_FRAMING_NFCF_T3T: 1286 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: 1287 case NFC_DIGITAL_FRAMING_ISO15693_T5T: 1288 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1289 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1290 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1291 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1292 break; 1293 case NFC_DIGITAL_FRAMING_NFCA_T2T: 1294 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1295 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1296 break; 1297 default: 1298 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1299 return -EINVAL; 1300 } 1301 1302 trf->framing = framing; 1303 1304 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1305 ret = trf7970a_is_rf_field(trf, &is_rf_field); 1306 if (ret) 1307 return ret; 1308 1309 if (is_rf_field) 1310 return -EBUSY; 1311 } 1312 1313 if (iso_ctrl != trf->iso_ctrl) { 1314 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1315 if (ret) 1316 return ret; 1317 1318 trf->iso_ctrl = iso_ctrl; 1319 1320 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1321 trf->modulator_sys_clk_ctrl); 1322 if (ret) 1323 return ret; 1324 } 1325 1326 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1327 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1328 trf->chip_status_ctrl | 1329 TRF7970A_CHIP_STATUS_RF_ON); 1330 if (ret) 1331 return ret; 1332 1333 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1334 1335 usleep_range(trf->guard_time, trf->guard_time + 1000); 1336 } 1337 1338 return 0; 1339 } 1340 1341 static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, 1342 int param) 1343 { 1344 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1345 int ret; 1346 1347 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1348 1349 mutex_lock(&trf->lock); 1350 1351 trf->is_initiator = true; 1352 1353 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1354 (trf->state == TRF7970A_ST_RF_OFF)) { 1355 ret = trf7970a_switch_rf_on(trf); 1356 if (ret) 1357 goto err_unlock; 1358 } 1359 1360 switch (type) { 1361 case NFC_DIGITAL_CONFIG_RF_TECH: 1362 ret = trf7970a_in_config_rf_tech(trf, param); 1363 break; 1364 case NFC_DIGITAL_CONFIG_FRAMING: 1365 ret = trf7970a_in_config_framing(trf, param); 1366 break; 1367 default: 1368 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1369 ret = -EINVAL; 1370 } 1371 1372 err_unlock: 1373 mutex_unlock(&trf->lock); 1374 return ret; 1375 } 1376 1377 static int trf7970a_is_iso15693_write_or_lock(u8 cmd) 1378 { 1379 switch (cmd) { 1380 case ISO15693_CMD_WRITE_SINGLE_BLOCK: 1381 case ISO15693_CMD_LOCK_BLOCK: 1382 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: 1383 case ISO15693_CMD_WRITE_AFI: 1384 case ISO15693_CMD_LOCK_AFI: 1385 case ISO15693_CMD_WRITE_DSFID: 1386 case ISO15693_CMD_LOCK_DSFID: 1387 return 1; 1388 break; 1389 default: 1390 return 0; 1391 } 1392 } 1393 1394 static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) 1395 { 1396 u8 *req = skb->data; 1397 u8 special_fcn_reg1, iso_ctrl; 1398 int ret; 1399 1400 trf->issue_eof = false; 1401 1402 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in 1403 * special functions register 1 is cleared; otherwise, its a write or 1404 * sector select command and '4_bit_RX' must be set. 1405 * 1406 * When issuing an ISO 15693 command, inspect the flags byte to see 1407 * what speed to use. Also, remember if the OPTION flag is set on 1408 * a Type 5 write or lock command so the driver will know that it 1409 * has to send an EOF in order to get a response. 1410 */ 1411 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && 1412 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { 1413 if (req[0] == NFC_T2T_CMD_READ) 1414 special_fcn_reg1 = 0; 1415 else 1416 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; 1417 1418 if (special_fcn_reg1 != trf->special_fcn_reg1) { 1419 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 1420 special_fcn_reg1); 1421 if (ret) 1422 return ret; 1423 1424 trf->special_fcn_reg1 = special_fcn_reg1; 1425 } 1426 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { 1427 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; 1428 1429 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { 1430 case 0x00: 1431 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; 1432 break; 1433 case ISO15693_REQ_FLAG_SUB_CARRIER: 1434 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; 1435 break; 1436 case ISO15693_REQ_FLAG_DATA_RATE: 1437 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1438 break; 1439 case (ISO15693_REQ_FLAG_SUB_CARRIER | 1440 ISO15693_REQ_FLAG_DATA_RATE): 1441 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; 1442 break; 1443 } 1444 1445 if (iso_ctrl != trf->iso_ctrl) { 1446 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1447 if (ret) 1448 return ret; 1449 1450 trf->iso_ctrl = iso_ctrl; 1451 } 1452 1453 if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && 1454 trf7970a_is_iso15693_write_or_lock(req[1]) && 1455 (req[0] & ISO15693_REQ_FLAG_OPTION)) 1456 trf->issue_eof = true; 1457 } 1458 1459 return 0; 1460 } 1461 1462 static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, 1463 struct sk_buff *skb, u16 timeout, 1464 nfc_digital_cmd_complete_t cb, void *arg) 1465 { 1466 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1467 u8 prefix[5]; 1468 unsigned int len; 1469 int ret; 1470 u8 status; 1471 1472 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", 1473 trf->state, timeout, skb->len); 1474 1475 if (skb->len > TRF7970A_TX_MAX) 1476 return -EINVAL; 1477 1478 mutex_lock(&trf->lock); 1479 1480 if ((trf->state != TRF7970A_ST_IDLE) && 1481 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1482 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1483 trf->state); 1484 ret = -EIO; 1485 goto out_err; 1486 } 1487 1488 if (trf->aborting) { 1489 dev_dbg(trf->dev, "Abort process complete\n"); 1490 trf->aborting = false; 1491 ret = -ECANCELED; 1492 goto out_err; 1493 } 1494 1495 if (timeout) { 1496 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1497 GFP_KERNEL); 1498 if (!trf->rx_skb) { 1499 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1500 ret = -ENOMEM; 1501 goto out_err; 1502 } 1503 } 1504 1505 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { 1506 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1507 if (ret) 1508 goto out_err; 1509 1510 trf->state = TRF7970A_ST_IDLE; 1511 } 1512 1513 if (trf->is_initiator) { 1514 ret = trf7970a_per_cmd_config(trf, skb); 1515 if (ret) 1516 goto out_err; 1517 } 1518 1519 trf->ddev = ddev; 1520 trf->tx_skb = skb; 1521 trf->cb = cb; 1522 trf->cb_arg = arg; 1523 trf->timeout = timeout; 1524 trf->ignore_timeout = false; 1525 1526 len = skb->len; 1527 1528 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends 1529 * on what the current framing is, the address of the TX length byte 1 1530 * register (0x1d), and the 2 byte length of the data to be transmitted. 1531 * That totals 5 bytes. 1532 */ 1533 prefix[0] = TRF7970A_CMD_BIT_CTRL | 1534 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); 1535 prefix[1] = TRF7970A_CMD_BIT_CTRL | 1536 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); 1537 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; 1538 1539 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { 1540 prefix[3] = 0x00; 1541 prefix[4] = 0x0f; /* 7 bits */ 1542 } else { 1543 prefix[3] = (len & 0xf00) >> 4; 1544 prefix[3] |= ((len & 0xf0) >> 4); 1545 prefix[4] = ((len & 0x0f) << 4); 1546 } 1547 1548 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); 1549 1550 /* Clear possible spurious interrupt */ 1551 ret = trf7970a_read_irqstatus(trf, &status); 1552 if (ret) 1553 goto out_err; 1554 1555 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); 1556 if (ret) { 1557 kfree_skb(trf->rx_skb); 1558 trf->rx_skb = NULL; 1559 } 1560 1561 out_err: 1562 mutex_unlock(&trf->lock); 1563 return ret; 1564 } 1565 1566 static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) 1567 { 1568 int ret = 0; 1569 1570 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1571 1572 switch (tech) { 1573 case NFC_DIGITAL_RF_TECH_106A: 1574 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1575 TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; 1576 trf->modulator_sys_clk_ctrl = 1577 (trf->modulator_sys_clk_ctrl & 0xf8) | 1578 TRF7970A_MODULATOR_DEPTH_OOK; 1579 break; 1580 case NFC_DIGITAL_RF_TECH_212F: 1581 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1582 TRF7970A_ISO_CTRL_NFC_NFCF_212; 1583 trf->modulator_sys_clk_ctrl = 1584 (trf->modulator_sys_clk_ctrl & 0xf8) | 1585 TRF7970A_MODULATOR_DEPTH_ASK10; 1586 break; 1587 case NFC_DIGITAL_RF_TECH_424F: 1588 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1589 TRF7970A_ISO_CTRL_NFC_NFCF_424; 1590 trf->modulator_sys_clk_ctrl = 1591 (trf->modulator_sys_clk_ctrl & 0xf8) | 1592 TRF7970A_MODULATOR_DEPTH_ASK10; 1593 break; 1594 default: 1595 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1596 return -EINVAL; 1597 } 1598 1599 trf->technology = tech; 1600 1601 /* Normally we write the ISO_CTRL register in 1602 * trf7970a_tg_config_framing() because the framing can change 1603 * the value written. However, when sending a PSL RES, 1604 * digital_tg_send_psl_res_complete() doesn't call 1605 * trf7970a_tg_config_framing() so we must write the register 1606 * here. 1607 */ 1608 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && 1609 (trf->iso_ctrl_tech != trf->iso_ctrl)) { 1610 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 1611 trf->iso_ctrl_tech); 1612 1613 trf->iso_ctrl = trf->iso_ctrl_tech; 1614 } 1615 1616 return ret; 1617 } 1618 1619 /* Since this is a target routine, several of the framing calls are 1620 * made between receiving the request and sending the response so they 1621 * should take effect until after the response is sent. This is accomplished 1622 * by skipping the ISO_CTRL register write here and doing it in the interrupt 1623 * handler. 1624 */ 1625 static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) 1626 { 1627 u8 iso_ctrl = trf->iso_ctrl_tech; 1628 int ret; 1629 1630 dev_dbg(trf->dev, "framing: %d\n", framing); 1631 1632 switch (framing) { 1633 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1634 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1635 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1636 break; 1637 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1638 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1639 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 1640 /* These ones are applied in the interrupt handler */ 1641 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ 1642 break; 1643 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1644 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1645 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1646 break; 1647 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: 1648 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1649 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1650 break; 1651 default: 1652 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1653 return -EINVAL; 1654 } 1655 1656 trf->framing = framing; 1657 1658 if (iso_ctrl != trf->iso_ctrl) { 1659 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1660 if (ret) 1661 return ret; 1662 1663 trf->iso_ctrl = iso_ctrl; 1664 1665 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1666 trf->modulator_sys_clk_ctrl); 1667 if (ret) 1668 return ret; 1669 } 1670 1671 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1672 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1673 trf->chip_status_ctrl | 1674 TRF7970A_CHIP_STATUS_RF_ON); 1675 if (ret) 1676 return ret; 1677 1678 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1679 } 1680 1681 return 0; 1682 } 1683 1684 static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, 1685 int param) 1686 { 1687 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1688 int ret; 1689 1690 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1691 1692 mutex_lock(&trf->lock); 1693 1694 trf->is_initiator = false; 1695 1696 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1697 (trf->state == TRF7970A_ST_RF_OFF)) { 1698 ret = trf7970a_switch_rf_on(trf); 1699 if (ret) 1700 goto err_unlock; 1701 } 1702 1703 switch (type) { 1704 case NFC_DIGITAL_CONFIG_RF_TECH: 1705 ret = trf7970a_tg_config_rf_tech(trf, param); 1706 break; 1707 case NFC_DIGITAL_CONFIG_FRAMING: 1708 ret = trf7970a_tg_config_framing(trf, param); 1709 break; 1710 default: 1711 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1712 ret = -EINVAL; 1713 } 1714 1715 err_unlock: 1716 mutex_unlock(&trf->lock); 1717 return ret; 1718 } 1719 1720 static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1721 nfc_digital_cmd_complete_t cb, void *arg, 1722 bool mode_detect) 1723 { 1724 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1725 int ret; 1726 1727 mutex_lock(&trf->lock); 1728 1729 if ((trf->state != TRF7970A_ST_IDLE) && 1730 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1731 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1732 trf->state); 1733 ret = -EIO; 1734 goto out_err; 1735 } 1736 1737 if (trf->aborting) { 1738 dev_dbg(trf->dev, "Abort process complete\n"); 1739 trf->aborting = false; 1740 ret = -ECANCELED; 1741 goto out_err; 1742 } 1743 1744 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1745 GFP_KERNEL); 1746 if (!trf->rx_skb) { 1747 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1748 ret = -ENOMEM; 1749 goto out_err; 1750 } 1751 1752 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, 1753 TRF7970A_RX_SPECIAL_SETTINGS_HBT | 1754 TRF7970A_RX_SPECIAL_SETTINGS_M848 | 1755 TRF7970A_RX_SPECIAL_SETTINGS_C424 | 1756 TRF7970A_RX_SPECIAL_SETTINGS_C212); 1757 if (ret) 1758 goto out_err; 1759 1760 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1761 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); 1762 if (ret) 1763 goto out_err; 1764 1765 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, 1766 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); 1767 if (ret) 1768 goto out_err; 1769 1770 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 1771 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); 1772 if (ret) 1773 goto out_err; 1774 1775 trf->ddev = ddev; 1776 trf->cb = cb; 1777 trf->cb_arg = arg; 1778 trf->timeout = timeout; 1779 trf->ignore_timeout = false; 1780 1781 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1782 if (ret) 1783 goto out_err; 1784 1785 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : 1786 TRF7970A_ST_LISTENING; 1787 1788 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 1789 1790 out_err: 1791 mutex_unlock(&trf->lock); 1792 return ret; 1793 } 1794 1795 static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1796 nfc_digital_cmd_complete_t cb, void *arg) 1797 { 1798 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1799 1800 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", 1801 trf->state, timeout); 1802 1803 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); 1804 } 1805 1806 static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, 1807 u16 timeout, nfc_digital_cmd_complete_t cb, 1808 void *arg) 1809 { 1810 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1811 int ret; 1812 1813 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", 1814 trf->state, timeout); 1815 1816 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, 1817 NFC_DIGITAL_RF_TECH_106A); 1818 if (ret) 1819 return ret; 1820 1821 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, 1822 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); 1823 if (ret) 1824 return ret; 1825 1826 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); 1827 } 1828 1829 static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) 1830 { 1831 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1832 1833 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", 1834 trf->state, trf->md_rf_tech); 1835 1836 *rf_tech = trf->md_rf_tech; 1837 1838 return 0; 1839 } 1840 1841 static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) 1842 { 1843 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1844 1845 dev_dbg(trf->dev, "Abort process initiated\n"); 1846 1847 mutex_lock(&trf->lock); 1848 1849 switch (trf->state) { 1850 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1851 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1852 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1853 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1854 trf->aborting = true; 1855 break; 1856 case TRF7970A_ST_LISTENING: 1857 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); 1858 trf7970a_send_err_upstream(trf, -ECANCELED); 1859 dev_dbg(trf->dev, "Abort process complete\n"); 1860 break; 1861 default: 1862 break; 1863 } 1864 1865 mutex_unlock(&trf->lock); 1866 } 1867 1868 static struct nfc_digital_ops trf7970a_nfc_ops = { 1869 .in_configure_hw = trf7970a_in_configure_hw, 1870 .in_send_cmd = trf7970a_send_cmd, 1871 .tg_configure_hw = trf7970a_tg_configure_hw, 1872 .tg_send_cmd = trf7970a_send_cmd, 1873 .tg_listen = trf7970a_tg_listen, 1874 .tg_listen_md = trf7970a_tg_listen_md, 1875 .tg_get_rf_tech = trf7970a_tg_get_rf_tech, 1876 .switch_rf = trf7970a_switch_rf, 1877 .abort_cmd = trf7970a_abort_cmd, 1878 }; 1879 1880 static int trf7970a_power_up(struct trf7970a *trf) 1881 { 1882 int ret; 1883 1884 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); 1885 1886 if (trf->state != TRF7970A_ST_PWR_OFF) 1887 return 0; 1888 1889 ret = regulator_enable(trf->regulator); 1890 if (ret) { 1891 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); 1892 return ret; 1893 } 1894 1895 usleep_range(5000, 6000); 1896 1897 if (trf->en2_gpiod && 1898 !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { 1899 gpiod_set_value_cansleep(trf->en2_gpiod, 1); 1900 usleep_range(1000, 2000); 1901 } 1902 1903 gpiod_set_value_cansleep(trf->en_gpiod, 1); 1904 1905 usleep_range(20000, 21000); 1906 1907 trf->state = TRF7970A_ST_RF_OFF; 1908 1909 return 0; 1910 } 1911 1912 static int trf7970a_power_down(struct trf7970a *trf) 1913 { 1914 int ret; 1915 1916 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); 1917 1918 if (trf->state == TRF7970A_ST_PWR_OFF) 1919 return 0; 1920 1921 if (trf->state != TRF7970A_ST_RF_OFF) { 1922 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", 1923 trf->state); 1924 return -EBUSY; 1925 } 1926 1927 gpiod_set_value_cansleep(trf->en_gpiod, 0); 1928 1929 if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) 1930 gpiod_set_value_cansleep(trf->en2_gpiod, 0); 1931 1932 ret = regulator_disable(trf->regulator); 1933 if (ret) 1934 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, 1935 ret); 1936 1937 trf->state = TRF7970A_ST_PWR_OFF; 1938 1939 return ret; 1940 } 1941 1942 static int trf7970a_startup(struct trf7970a *trf) 1943 { 1944 int ret; 1945 1946 ret = trf7970a_power_up(trf); 1947 if (ret) 1948 return ret; 1949 1950 pm_runtime_set_active(trf->dev); 1951 pm_runtime_enable(trf->dev); 1952 pm_runtime_mark_last_busy(trf->dev); 1953 1954 return 0; 1955 } 1956 1957 static void trf7970a_shutdown(struct trf7970a *trf) 1958 { 1959 switch (trf->state) { 1960 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1961 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1962 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1963 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1964 case TRF7970A_ST_LISTENING: 1965 trf7970a_send_err_upstream(trf, -ECANCELED); 1966 /* FALLTHROUGH */ 1967 case TRF7970A_ST_IDLE: 1968 case TRF7970A_ST_IDLE_RX_BLOCKED: 1969 trf7970a_switch_rf_off(trf); 1970 break; 1971 default: 1972 break; 1973 } 1974 1975 pm_runtime_disable(trf->dev); 1976 pm_runtime_set_suspended(trf->dev); 1977 1978 trf7970a_power_down(trf); 1979 } 1980 1981 static int trf7970a_get_autosuspend_delay(struct device_node *np) 1982 { 1983 int autosuspend_delay, ret; 1984 1985 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); 1986 if (ret) 1987 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; 1988 1989 return autosuspend_delay; 1990 } 1991 1992 static int trf7970a_probe(struct spi_device *spi) 1993 { 1994 struct device_node *np = spi->dev.of_node; 1995 struct trf7970a *trf; 1996 int uvolts, autosuspend_delay, ret; 1997 u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; 1998 1999 if (!np) { 2000 dev_err(&spi->dev, "No Device Tree entry\n"); 2001 return -EINVAL; 2002 } 2003 2004 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); 2005 if (!trf) 2006 return -ENOMEM; 2007 2008 trf->state = TRF7970A_ST_PWR_OFF; 2009 trf->dev = &spi->dev; 2010 trf->spi = spi; 2011 2012 spi->mode = SPI_MODE_1; 2013 spi->bits_per_word = 8; 2014 2015 ret = spi_setup(spi); 2016 if (ret < 0) { 2017 dev_err(trf->dev, "Can't set up SPI Communication\n"); 2018 return ret; 2019 } 2020 2021 if (of_property_read_bool(np, "irq-status-read-quirk")) 2022 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; 2023 2024 /* There are two enable pins - only EN must be present in the DT */ 2025 trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0, 2026 GPIOD_OUT_LOW); 2027 if (IS_ERR(trf->en_gpiod)) { 2028 dev_err(trf->dev, "No EN GPIO property\n"); 2029 return PTR_ERR(trf->en_gpiod); 2030 } 2031 2032 trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1, 2033 GPIOD_OUT_LOW); 2034 if (!trf->en2_gpiod) { 2035 dev_info(trf->dev, "No EN2 GPIO property\n"); 2036 } else if (IS_ERR(trf->en2_gpiod)) { 2037 dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n", 2038 PTR_ERR(trf->en2_gpiod)); 2039 return PTR_ERR(trf->en2_gpiod); 2040 } else if (of_property_read_bool(np, "en2-rf-quirk")) { 2041 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; 2042 } 2043 2044 of_property_read_u32(np, "clock-frequency", &clk_freq); 2045 if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && 2046 (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { 2047 dev_err(trf->dev, 2048 "clock-frequency (%u Hz) unsupported\n", clk_freq); 2049 return -EINVAL; 2050 } 2051 2052 if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) { 2053 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; 2054 dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n"); 2055 } else { 2056 trf->modulator_sys_clk_ctrl = 0; 2057 } 2058 2059 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, 2060 trf7970a_irq, 2061 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 2062 "trf7970a", trf); 2063 if (ret) { 2064 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); 2065 return ret; 2066 } 2067 2068 mutex_init(&trf->lock); 2069 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); 2070 2071 trf->regulator = devm_regulator_get(&spi->dev, "vin"); 2072 if (IS_ERR(trf->regulator)) { 2073 ret = PTR_ERR(trf->regulator); 2074 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); 2075 goto err_destroy_lock; 2076 } 2077 2078 ret = regulator_enable(trf->regulator); 2079 if (ret) { 2080 dev_err(trf->dev, "Can't enable VIN: %d\n", ret); 2081 goto err_destroy_lock; 2082 } 2083 2084 uvolts = regulator_get_voltage(trf->regulator); 2085 if (uvolts > 4000000) 2086 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; 2087 2088 trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); 2089 if (IS_ERR(trf->regulator)) { 2090 ret = PTR_ERR(trf->regulator); 2091 dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); 2092 goto err_destroy_lock; 2093 } 2094 2095 ret = regulator_enable(trf->regulator); 2096 if (ret) { 2097 dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); 2098 goto err_destroy_lock; 2099 } 2100 2101 if (regulator_get_voltage(trf->regulator) == 1800000) { 2102 trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; 2103 dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); 2104 } 2105 2106 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, 2107 TRF7970A_SUPPORTED_PROTOCOLS, 2108 NFC_DIGITAL_DRV_CAPS_IN_CRC | 2109 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 2110 0); 2111 if (!trf->ddev) { 2112 dev_err(trf->dev, "Can't allocate NFC digital device\n"); 2113 ret = -ENOMEM; 2114 goto err_disable_regulator; 2115 } 2116 2117 nfc_digital_set_parent_dev(trf->ddev, trf->dev); 2118 nfc_digital_set_drvdata(trf->ddev, trf); 2119 spi_set_drvdata(spi, trf); 2120 2121 autosuspend_delay = trf7970a_get_autosuspend_delay(np); 2122 2123 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); 2124 pm_runtime_use_autosuspend(trf->dev); 2125 2126 ret = trf7970a_startup(trf); 2127 if (ret) 2128 goto err_free_ddev; 2129 2130 ret = nfc_digital_register_device(trf->ddev); 2131 if (ret) { 2132 dev_err(trf->dev, "Can't register NFC digital device: %d\n", 2133 ret); 2134 goto err_shutdown; 2135 } 2136 2137 return 0; 2138 2139 err_shutdown: 2140 trf7970a_shutdown(trf); 2141 err_free_ddev: 2142 nfc_digital_free_device(trf->ddev); 2143 err_disable_regulator: 2144 regulator_disable(trf->regulator); 2145 err_destroy_lock: 2146 mutex_destroy(&trf->lock); 2147 return ret; 2148 } 2149 2150 static int 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->regulator); 2164 2165 mutex_destroy(&trf->lock); 2166 2167 return 0; 2168 } 2169 2170 #ifdef CONFIG_PM_SLEEP 2171 static int trf7970a_suspend(struct device *dev) 2172 { 2173 struct spi_device *spi = to_spi_device(dev); 2174 struct trf7970a *trf = spi_get_drvdata(spi); 2175 2176 dev_dbg(dev, "Suspend\n"); 2177 2178 mutex_lock(&trf->lock); 2179 2180 trf7970a_shutdown(trf); 2181 2182 mutex_unlock(&trf->lock); 2183 2184 return 0; 2185 } 2186 2187 static int trf7970a_resume(struct device *dev) 2188 { 2189 struct spi_device *spi = to_spi_device(dev); 2190 struct trf7970a *trf = spi_get_drvdata(spi); 2191 int ret; 2192 2193 dev_dbg(dev, "Resume\n"); 2194 2195 mutex_lock(&trf->lock); 2196 2197 ret = trf7970a_startup(trf); 2198 2199 mutex_unlock(&trf->lock); 2200 2201 return ret; 2202 } 2203 #endif 2204 2205 #ifdef CONFIG_PM 2206 static int trf7970a_pm_runtime_suspend(struct device *dev) 2207 { 2208 struct spi_device *spi = to_spi_device(dev); 2209 struct trf7970a *trf = spi_get_drvdata(spi); 2210 int ret; 2211 2212 dev_dbg(dev, "Runtime suspend\n"); 2213 2214 mutex_lock(&trf->lock); 2215 2216 ret = trf7970a_power_down(trf); 2217 2218 mutex_unlock(&trf->lock); 2219 2220 return ret; 2221 } 2222 2223 static int trf7970a_pm_runtime_resume(struct device *dev) 2224 { 2225 struct spi_device *spi = to_spi_device(dev); 2226 struct trf7970a *trf = spi_get_drvdata(spi); 2227 int ret; 2228 2229 dev_dbg(dev, "Runtime resume\n"); 2230 2231 ret = trf7970a_power_up(trf); 2232 if (!ret) 2233 pm_runtime_mark_last_busy(dev); 2234 2235 return ret; 2236 } 2237 #endif 2238 2239 static const struct dev_pm_ops trf7970a_pm_ops = { 2240 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) 2241 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, 2242 trf7970a_pm_runtime_resume, NULL) 2243 }; 2244 2245 static const struct of_device_id trf7970a_of_match[] = { 2246 {.compatible = "ti,trf7970a",}, 2247 {}, 2248 }; 2249 2250 MODULE_DEVICE_TABLE(of, trf7970a_of_match); 2251 2252 static const struct spi_device_id trf7970a_id_table[] = { 2253 {"trf7970a", 0}, 2254 {} 2255 }; 2256 2257 MODULE_DEVICE_TABLE(spi, trf7970a_id_table); 2258 2259 static struct spi_driver trf7970a_spi_driver = { 2260 .probe = trf7970a_probe, 2261 .remove = trf7970a_remove, 2262 .id_table = trf7970a_id_table, 2263 .driver = { 2264 .name = "trf7970a", 2265 .of_match_table = of_match_ptr(trf7970a_of_match), 2266 .pm = &trf7970a_pm_ops, 2267 }, 2268 }; 2269 2270 module_spi_driver(trf7970a_spi_driver); 2271 2272 MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); 2273 MODULE_LICENSE("GPL v2"); 2274 MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); 2275