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.h> 24 #include <linux/of.h> 25 #include <linux/of_gpio.h> 26 #include <linux/spi/spi.h> 27 #include <linux/regulator/consumer.h> 28 29 #include <net/nfc/nfc.h> 30 #include <net/nfc/digital.h> 31 32 /* There are 3 ways the host can communicate with the trf7970a: 33 * parallel mode, SPI with Slave Select (SS) mode, and SPI without 34 * SS mode. The driver only supports the two SPI modes. 35 * 36 * The trf7970a is very timing sensitive and the VIN, EN2, and EN 37 * pins must asserted in that order and with specific delays in between. 38 * The delays used in the driver were provided by TI and have been 39 * confirmed to work with this driver. There is a bug with the current 40 * version of the trf7970a that requires that EN2 remain low no matter 41 * what. If it goes high, it will generate an RF field even when in 42 * passive target mode. TI has indicated that the chip will work okay 43 * when EN2 is left low. The 'en2-rf-quirk' device tree property 44 * indicates that trf7970a currently being used has the erratum and 45 * that EN2 must be kept low. 46 * 47 * Timeouts are implemented using the delayed workqueue kernel facility. 48 * Timeouts are required so things don't hang when there is no response 49 * from the trf7970a (or tag). Using this mechanism creates a race with 50 * interrupts, however. That is, an interrupt and a timeout could occur 51 * closely enough together that one is blocked by the mutex while the other 52 * executes. When the timeout handler executes first and blocks the 53 * interrupt handler, it will eventually set the state to IDLE so the 54 * interrupt handler will check the state and exit with no harm done. 55 * When the interrupt handler executes first and blocks the timeout handler, 56 * the cancel_delayed_work() call will know that it didn't cancel the 57 * work item (i.e., timeout) and will return zero. That return code is 58 * used by the timer handler to indicate that it should ignore the timeout 59 * once its unblocked. 60 * 61 * Aborting an active command isn't as simple as it seems because the only 62 * way to abort a command that's already been sent to the tag is so turn 63 * off power to the tag. If we do that, though, we'd have to go through 64 * the entire anticollision procedure again but the digital layer doesn't 65 * support that. So, if an abort is received before trf7970a_send_cmd() 66 * has sent the command to the tag, it simply returns -ECANCELED. If the 67 * command has already been sent to the tag, then the driver continues 68 * normally and recieves the response data (or error) but just before 69 * sending the data upstream, it frees the rx_skb and sends -ECANCELED 70 * upstream instead. If the command failed, that error will be sent 71 * upstream. 72 * 73 * When recieving data from a tag and the interrupt status register has 74 * only the SRX bit set, it means that all of the data has been received 75 * (once what's in the fifo has been read). However, depending on timing 76 * an interrupt status with only the SRX bit set may not be recived. In 77 * those cases, the timeout mechanism is used to wait 20 ms in case more 78 * data arrives. After 20 ms, it is assumed that all of the data has been 79 * received and the accumulated rx data is sent upstream. The 80 * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose 81 * (i.e., it indicates that some data has been received but we're not sure 82 * if there is more coming so a timeout in this state means all data has 83 * been received and there isn't an error). The delay is 20 ms since delays 84 * of ~16 ms have been observed during testing. 85 * 86 * When transmitting a frame larger than the FIFO size (127 bytes), the 87 * driver will wait 20 ms for the FIFO to drain past the low-watermark 88 * and generate an interrupt. The low-watermark set to 32 bytes so the 89 * interrupt should fire after 127 - 32 = 95 bytes have been sent. At 90 * the lowest possible bit rate (6.62 kbps for 15693), it will take up 91 * to ~14.35 ms so 20 ms is used for the timeout. 92 * 93 * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. 94 * Having only 4 bits in the FIFO won't normally generate an interrupt so 95 * driver enables the '4_bit_RX' bit of the Special Functions register 1 96 * to cause an interrupt in that case. Leaving that bit for a read command 97 * messes up the data returned so it is only enabled when the framing is 98 * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. 99 * Unfortunately, that means that the driver has to peek into tx frames 100 * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by 101 * the trf7970a_per_cmd_config() routine. 102 * 103 * ISO/IEC 15693 frames specify whether to use single or double sub-carrier 104 * frequencies and whether to use low or high data rates in the flags byte 105 * of the frame. This means that the driver has to peek at all 15693 frames 106 * to determine what speed to set the communication to. In addition, write 107 * and lock commands use the OPTION flag to indicate that an EOF must be 108 * sent to the tag before it will send its response. So the driver has to 109 * examine all frames for that reason too. 110 * 111 * It is unclear how long to wait before sending the EOF. According to the 112 * Note under Table 1-1 in section 1.6 of 113 * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least 114 * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long 115 * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain 116 * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to 117 * ensure the wait is long enough before sending the EOF. This seems to work 118 * reliably. 119 */ 120 121 #define TRF7970A_SUPPORTED_PROTOCOLS \ 122 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ 123 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ 124 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) 125 126 #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ 127 128 #define TRF7970A_RX_SKB_ALLOC_SIZE 256 129 130 #define TRF7970A_FIFO_SIZE 127 131 132 /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ 133 #define TRF7970A_TX_MAX (4096 - 1) 134 135 #define TRF7970A_WAIT_FOR_TX_IRQ 20 136 #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 137 #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 138 #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 139 140 /* Guard times for various RF technologies (in us) */ 141 #define TRF7970A_GUARD_TIME_NFCA 5000 142 #define TRF7970A_GUARD_TIME_NFCB 5000 143 #define TRF7970A_GUARD_TIME_NFCF 20000 144 #define TRF7970A_GUARD_TIME_15693 1000 145 146 /* Quirks */ 147 /* Erratum: When reading IRQ Status register on trf7970a, we must issue a 148 * read continuous command for IRQ Status and Collision Position registers. 149 */ 150 #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) 151 #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) 152 #define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2) 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(3) 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 unsigned int guard_time; 445 int technology; 446 int framing; 447 u8 md_rf_tech; 448 u8 tx_cmd; 449 bool issue_eof; 450 bool adjust_resp_len; 451 int en2_gpio; 452 int en_gpio; 453 struct mutex lock; 454 unsigned int timeout; 455 bool ignore_timeout; 456 struct delayed_work timeout_work; 457 }; 458 459 460 static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) 461 { 462 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); 463 int ret; 464 465 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); 466 467 ret = spi_write(trf->spi, &cmd, 1); 468 if (ret) 469 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, 470 ret); 471 return ret; 472 } 473 474 static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) 475 { 476 u8 addr = TRF7970A_CMD_BIT_RW | reg; 477 int ret; 478 479 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); 480 if (ret) 481 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, 482 ret); 483 484 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); 485 486 return ret; 487 } 488 489 static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, 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 if (trf->adjust_resp_len) { 632 skb_trim(trf->rx_skb, trf->rx_skb->len - 1); 633 trf->adjust_resp_len = false; 634 } 635 636 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); 637 638 trf->rx_skb = NULL; 639 } 640 641 static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) 642 { 643 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); 644 645 cancel_delayed_work(&trf->timeout_work); 646 647 kfree_skb(trf->rx_skb); 648 trf->rx_skb = ERR_PTR(errno); 649 650 trf7970a_send_upstream(trf); 651 } 652 653 static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, 654 unsigned int len, u8 *prefix, unsigned int prefix_len) 655 { 656 struct spi_transfer t[2]; 657 struct spi_message m; 658 unsigned int timeout; 659 int ret; 660 661 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, 662 16, 1, skb->data, len, false); 663 664 spi_message_init(&m); 665 666 memset(&t, 0, sizeof(t)); 667 668 t[0].tx_buf = prefix; 669 t[0].len = prefix_len; 670 spi_message_add_tail(&t[0], &m); 671 672 t[1].tx_buf = skb->data; 673 t[1].len = len; 674 spi_message_add_tail(&t[1], &m); 675 676 ret = spi_sync(trf->spi, &m); 677 if (ret) { 678 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, 679 ret); 680 return ret; 681 } 682 683 skb_pull(skb, len); 684 685 if (skb->len > 0) { 686 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; 687 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; 688 } else { 689 if (trf->issue_eof) { 690 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; 691 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; 692 } else { 693 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 694 695 if (!trf->timeout) 696 timeout = TRF7970A_WAIT_FOR_TX_IRQ; 697 else 698 timeout = trf->timeout; 699 } 700 } 701 702 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, 703 trf->state); 704 705 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 706 707 return 0; 708 } 709 710 static void trf7970a_fill_fifo(struct trf7970a *trf) 711 { 712 struct sk_buff *skb = trf->tx_skb; 713 unsigned int len; 714 int ret; 715 u8 fifo_bytes; 716 u8 prefix; 717 718 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 719 if (ret) { 720 trf7970a_send_err_upstream(trf, ret); 721 return; 722 } 723 724 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 725 726 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 727 728 /* Calculate how much more data can be written to the fifo */ 729 len = TRF7970A_FIFO_SIZE - fifo_bytes; 730 if (!len) { 731 schedule_delayed_work(&trf->timeout_work, 732 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); 733 return; 734 } 735 736 len = min(skb->len, len); 737 738 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; 739 740 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); 741 if (ret) 742 trf7970a_send_err_upstream(trf, ret); 743 } 744 745 static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) 746 { 747 struct sk_buff *skb = trf->rx_skb; 748 int ret; 749 u8 fifo_bytes; 750 751 if (status & TRF7970A_IRQ_STATUS_ERROR) { 752 trf7970a_send_err_upstream(trf, -EIO); 753 return; 754 } 755 756 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 757 if (ret) { 758 trf7970a_send_err_upstream(trf, ret); 759 return; 760 } 761 762 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); 763 764 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 765 766 if (!fifo_bytes) 767 goto no_rx_data; 768 769 if (fifo_bytes > skb_tailroom(skb)) { 770 skb = skb_copy_expand(skb, skb_headroom(skb), 771 max_t(int, fifo_bytes, 772 TRF7970A_RX_SKB_ALLOC_SIZE), 773 GFP_KERNEL); 774 if (!skb) { 775 trf7970a_send_err_upstream(trf, -ENOMEM); 776 return; 777 } 778 779 kfree_skb(trf->rx_skb); 780 trf->rx_skb = skb; 781 } 782 783 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, 784 skb_put(skb, fifo_bytes), fifo_bytes); 785 if (ret) { 786 trf7970a_send_err_upstream(trf, ret); 787 return; 788 } 789 790 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ 791 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && 792 (trf->special_fcn_reg1 == 793 TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { 794 skb->data[0] >>= 4; 795 status = TRF7970A_IRQ_STATUS_SRX; 796 } else { 797 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; 798 799 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); 800 if (ret) { 801 trf7970a_send_err_upstream(trf, ret); 802 return; 803 } 804 805 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 806 807 /* If there are bytes in the FIFO, set status to '0' so 808 * the if stmt below doesn't fire and the driver will wait 809 * for the trf7970a to generate another RX interrupt. 810 */ 811 if (fifo_bytes) 812 status = 0; 813 } 814 815 no_rx_data: 816 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ 817 trf7970a_send_upstream(trf); 818 return; 819 } 820 821 dev_dbg(trf->dev, "Setting timeout for %d ms\n", 822 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); 823 824 schedule_delayed_work(&trf->timeout_work, 825 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); 826 } 827 828 static irqreturn_t trf7970a_irq(int irq, void *dev_id) 829 { 830 struct trf7970a *trf = dev_id; 831 int ret; 832 u8 status, fifo_bytes, iso_ctrl; 833 834 mutex_lock(&trf->lock); 835 836 if (trf->state == TRF7970A_ST_RF_OFF) { 837 mutex_unlock(&trf->lock); 838 return IRQ_NONE; 839 } 840 841 ret = trf7970a_read_irqstatus(trf, &status); 842 if (ret) { 843 mutex_unlock(&trf->lock); 844 return IRQ_NONE; 845 } 846 847 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, 848 status); 849 850 if (!status) { 851 mutex_unlock(&trf->lock); 852 return IRQ_NONE; 853 } 854 855 switch (trf->state) { 856 case TRF7970A_ST_IDLE: 857 case TRF7970A_ST_IDLE_RX_BLOCKED: 858 /* If initiator and getting interrupts caused by RF noise, 859 * turn off the receiver to avoid unnecessary interrupts. 860 * It will be turned back on in trf7970a_send_cmd() when 861 * the next command is issued. 862 */ 863 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { 864 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); 865 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; 866 } 867 868 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 869 break; 870 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 871 if (status & TRF7970A_IRQ_STATUS_TX) { 872 trf->ignore_timeout = 873 !cancel_delayed_work(&trf->timeout_work); 874 trf7970a_fill_fifo(trf); 875 } else { 876 trf7970a_send_err_upstream(trf, -EIO); 877 } 878 break; 879 case TRF7970A_ST_WAIT_FOR_RX_DATA: 880 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 881 if (status & TRF7970A_IRQ_STATUS_SRX) { 882 trf->ignore_timeout = 883 !cancel_delayed_work(&trf->timeout_work); 884 trf7970a_drain_fifo(trf, status); 885 } else if (status & TRF7970A_IRQ_STATUS_FIFO) { 886 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, 887 &fifo_bytes); 888 889 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; 890 891 if (ret) 892 trf7970a_send_err_upstream(trf, ret); 893 else if (!fifo_bytes) 894 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 895 } else if ((status == TRF7970A_IRQ_STATUS_TX) || 896 (!trf->is_initiator && 897 (status == (TRF7970A_IRQ_STATUS_TX | 898 TRF7970A_IRQ_STATUS_NFC_RF)))) { 899 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 900 901 if (!trf->timeout) { 902 trf->ignore_timeout = !cancel_delayed_work( 903 &trf->timeout_work); 904 trf->rx_skb = ERR_PTR(0); 905 trf7970a_send_upstream(trf); 906 break; 907 } 908 909 if (trf->is_initiator) 910 break; 911 912 iso_ctrl = trf->iso_ctrl; 913 914 switch (trf->framing) { 915 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 916 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 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_STANDARD_WITH_CRC_A: 921 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 922 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 923 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ 924 break; 925 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 926 ret = trf7970a_write(trf, 927 TRF7970A_SPECIAL_FCN_REG1, 928 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); 929 if (ret) 930 goto err_unlock_exit; 931 932 trf->special_fcn_reg1 = 933 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; 934 break; 935 default: 936 break; 937 } 938 939 if (iso_ctrl != trf->iso_ctrl) { 940 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 941 iso_ctrl); 942 if (ret) 943 goto err_unlock_exit; 944 945 trf->iso_ctrl = iso_ctrl; 946 } 947 } else { 948 trf7970a_send_err_upstream(trf, -EIO); 949 } 950 break; 951 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 952 if (status != TRF7970A_IRQ_STATUS_TX) 953 trf7970a_send_err_upstream(trf, -EIO); 954 break; 955 case TRF7970A_ST_LISTENING: 956 if (status & TRF7970A_IRQ_STATUS_SRX) { 957 trf->ignore_timeout = 958 !cancel_delayed_work(&trf->timeout_work); 959 trf7970a_drain_fifo(trf, status); 960 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 961 trf7970a_send_err_upstream(trf, -EIO); 962 } 963 break; 964 case TRF7970A_ST_LISTENING_MD: 965 if (status & TRF7970A_IRQ_STATUS_SRX) { 966 trf->ignore_timeout = 967 !cancel_delayed_work(&trf->timeout_work); 968 969 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); 970 if (ret) { 971 trf7970a_send_err_upstream(trf, ret); 972 } else { 973 trf->state = TRF7970A_ST_LISTENING; 974 trf7970a_drain_fifo(trf, status); 975 } 976 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { 977 trf7970a_send_err_upstream(trf, -EIO); 978 } 979 break; 980 default: 981 dev_err(trf->dev, "%s - Driver in invalid state: %d\n", 982 __func__, trf->state); 983 } 984 985 err_unlock_exit: 986 mutex_unlock(&trf->lock); 987 return IRQ_HANDLED; 988 } 989 990 static void trf7970a_issue_eof(struct trf7970a *trf) 991 { 992 int ret; 993 994 dev_dbg(trf->dev, "Issuing EOF\n"); 995 996 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); 997 if (ret) 998 trf7970a_send_err_upstream(trf, ret); 999 1000 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); 1001 if (ret) 1002 trf7970a_send_err_upstream(trf, ret); 1003 1004 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; 1005 1006 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", 1007 trf->timeout, trf->state); 1008 1009 schedule_delayed_work(&trf->timeout_work, 1010 msecs_to_jiffies(trf->timeout)); 1011 } 1012 1013 static void trf7970a_timeout_work_handler(struct work_struct *work) 1014 { 1015 struct trf7970a *trf = container_of(work, struct trf7970a, 1016 timeout_work.work); 1017 1018 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", 1019 trf->state, trf->ignore_timeout); 1020 1021 mutex_lock(&trf->lock); 1022 1023 if (trf->ignore_timeout) 1024 trf->ignore_timeout = false; 1025 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) 1026 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); 1027 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) 1028 trf7970a_issue_eof(trf); 1029 else 1030 trf7970a_send_err_upstream(trf, -ETIMEDOUT); 1031 1032 mutex_unlock(&trf->lock); 1033 } 1034 1035 static int trf7970a_init(struct trf7970a *trf) 1036 { 1037 int ret; 1038 1039 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); 1040 1041 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); 1042 if (ret) 1043 goto err_out; 1044 1045 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); 1046 if (ret) 1047 goto err_out; 1048 1049 usleep_range(1000, 2000); 1050 1051 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1052 1053 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 0); 1054 if (ret) 1055 goto err_out; 1056 1057 trf->modulator_sys_clk_ctrl = 0; 1058 1059 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, 1060 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | 1061 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); 1062 if (ret) 1063 goto err_out; 1064 1065 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); 1066 if (ret) 1067 goto err_out; 1068 1069 trf->special_fcn_reg1 = 0; 1070 1071 trf->iso_ctrl = 0xff; 1072 return 0; 1073 1074 err_out: 1075 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); 1076 return ret; 1077 } 1078 1079 static void trf7970a_switch_rf_off(struct trf7970a *trf) 1080 { 1081 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1082 (trf->state == TRF7970A_ST_RF_OFF)) 1083 return; 1084 1085 dev_dbg(trf->dev, "Switching rf off\n"); 1086 1087 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; 1088 1089 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); 1090 1091 trf->aborting = false; 1092 trf->state = TRF7970A_ST_RF_OFF; 1093 1094 pm_runtime_mark_last_busy(trf->dev); 1095 pm_runtime_put_autosuspend(trf->dev); 1096 } 1097 1098 static int trf7970a_switch_rf_on(struct trf7970a *trf) 1099 { 1100 int ret; 1101 1102 dev_dbg(trf->dev, "Switching rf on\n"); 1103 1104 pm_runtime_get_sync(trf->dev); 1105 1106 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ 1107 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, 1108 trf->state); 1109 return -EINVAL; 1110 } 1111 1112 ret = trf7970a_init(trf); 1113 if (ret) { 1114 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); 1115 return ret; 1116 } 1117 1118 trf->state = TRF7970A_ST_IDLE; 1119 1120 return 0; 1121 } 1122 1123 static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) 1124 { 1125 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1126 int ret = 0; 1127 1128 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); 1129 1130 mutex_lock(&trf->lock); 1131 1132 if (on) { 1133 switch (trf->state) { 1134 case TRF7970A_ST_PWR_OFF: 1135 case TRF7970A_ST_RF_OFF: 1136 ret = trf7970a_switch_rf_on(trf); 1137 break; 1138 case TRF7970A_ST_IDLE: 1139 case TRF7970A_ST_IDLE_RX_BLOCKED: 1140 break; 1141 default: 1142 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1143 __func__, trf->state, on); 1144 trf7970a_switch_rf_off(trf); 1145 ret = -EINVAL; 1146 } 1147 } else { 1148 switch (trf->state) { 1149 case TRF7970A_ST_PWR_OFF: 1150 case TRF7970A_ST_RF_OFF: 1151 break; 1152 default: 1153 dev_err(trf->dev, "%s - Invalid request: %d %d\n", 1154 __func__, trf->state, on); 1155 ret = -EINVAL; 1156 /* FALLTHROUGH */ 1157 case TRF7970A_ST_IDLE: 1158 case TRF7970A_ST_IDLE_RX_BLOCKED: 1159 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1160 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1161 trf7970a_switch_rf_off(trf); 1162 } 1163 } 1164 1165 mutex_unlock(&trf->lock); 1166 return ret; 1167 } 1168 1169 static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) 1170 { 1171 int ret = 0; 1172 1173 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1174 1175 switch (tech) { 1176 case NFC_DIGITAL_RF_TECH_106A: 1177 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; 1178 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; 1179 trf->guard_time = TRF7970A_GUARD_TIME_NFCA; 1180 break; 1181 case NFC_DIGITAL_RF_TECH_106B: 1182 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; 1183 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; 1184 trf->guard_time = TRF7970A_GUARD_TIME_NFCB; 1185 break; 1186 case NFC_DIGITAL_RF_TECH_212F: 1187 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; 1188 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; 1189 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1190 break; 1191 case NFC_DIGITAL_RF_TECH_424F: 1192 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; 1193 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; 1194 trf->guard_time = TRF7970A_GUARD_TIME_NFCF; 1195 break; 1196 case NFC_DIGITAL_RF_TECH_ISO15693: 1197 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1198 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; 1199 trf->guard_time = TRF7970A_GUARD_TIME_15693; 1200 break; 1201 default: 1202 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1203 return -EINVAL; 1204 } 1205 1206 trf->technology = tech; 1207 1208 /* If in initiator mode and not changing the RF tech due to a 1209 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from 1210 * trf7970a_init()), clear the NFC Target Detection Level register 1211 * due to erratum. 1212 */ 1213 if (trf->iso_ctrl == 0xff) 1214 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); 1215 1216 return ret; 1217 } 1218 1219 static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) 1220 { 1221 int ret; 1222 u8 rssi; 1223 1224 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1225 trf->chip_status_ctrl | TRF7970A_CHIP_STATUS_REC_ON); 1226 if (ret) 1227 return ret; 1228 1229 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); 1230 if (ret) 1231 return ret; 1232 1233 usleep_range(50, 60); 1234 1235 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); 1236 if (ret) 1237 return ret; 1238 1239 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1240 trf->chip_status_ctrl); 1241 if (ret) 1242 return ret; 1243 1244 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) 1245 *is_rf_field = true; 1246 else 1247 *is_rf_field = false; 1248 1249 return 0; 1250 } 1251 1252 static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) 1253 { 1254 u8 iso_ctrl = trf->iso_ctrl_tech; 1255 bool is_rf_field = false; 1256 int ret; 1257 1258 dev_dbg(trf->dev, "framing: %d\n", framing); 1259 1260 switch (framing) { 1261 case NFC_DIGITAL_FRAMING_NFCA_SHORT: 1262 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1263 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1264 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1265 break; 1266 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1267 case NFC_DIGITAL_FRAMING_NFCA_T4T: 1268 case NFC_DIGITAL_FRAMING_NFCB: 1269 case NFC_DIGITAL_FRAMING_NFCB_T4T: 1270 case NFC_DIGITAL_FRAMING_NFCF: 1271 case NFC_DIGITAL_FRAMING_NFCF_T3T: 1272 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: 1273 case NFC_DIGITAL_FRAMING_ISO15693_T5T: 1274 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1275 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1276 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1277 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1278 break; 1279 case NFC_DIGITAL_FRAMING_NFCA_T2T: 1280 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1281 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1282 break; 1283 default: 1284 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1285 return -EINVAL; 1286 } 1287 1288 trf->framing = framing; 1289 1290 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1291 ret = trf7970a_is_rf_field(trf, &is_rf_field); 1292 if (ret) 1293 return ret; 1294 1295 if (is_rf_field) 1296 return -EBUSY; 1297 } 1298 1299 if (iso_ctrl != trf->iso_ctrl) { 1300 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1301 if (ret) 1302 return ret; 1303 1304 trf->iso_ctrl = iso_ctrl; 1305 1306 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1307 trf->modulator_sys_clk_ctrl); 1308 if (ret) 1309 return ret; 1310 } 1311 1312 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1313 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1314 trf->chip_status_ctrl | 1315 TRF7970A_CHIP_STATUS_RF_ON); 1316 if (ret) 1317 return ret; 1318 1319 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1320 1321 usleep_range(trf->guard_time, trf->guard_time + 1000); 1322 } 1323 1324 return 0; 1325 } 1326 1327 static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, 1328 int param) 1329 { 1330 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1331 int ret; 1332 1333 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1334 1335 mutex_lock(&trf->lock); 1336 1337 trf->is_initiator = true; 1338 1339 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1340 (trf->state == TRF7970A_ST_RF_OFF)) { 1341 ret = trf7970a_switch_rf_on(trf); 1342 if (ret) 1343 goto err_unlock; 1344 } 1345 1346 switch (type) { 1347 case NFC_DIGITAL_CONFIG_RF_TECH: 1348 ret = trf7970a_in_config_rf_tech(trf, param); 1349 break; 1350 case NFC_DIGITAL_CONFIG_FRAMING: 1351 ret = trf7970a_in_config_framing(trf, param); 1352 break; 1353 default: 1354 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1355 ret = -EINVAL; 1356 } 1357 1358 err_unlock: 1359 mutex_unlock(&trf->lock); 1360 return ret; 1361 } 1362 1363 static int trf7970a_is_iso15693_write_or_lock(u8 cmd) 1364 { 1365 switch (cmd) { 1366 case ISO15693_CMD_WRITE_SINGLE_BLOCK: 1367 case ISO15693_CMD_LOCK_BLOCK: 1368 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: 1369 case ISO15693_CMD_WRITE_AFI: 1370 case ISO15693_CMD_LOCK_AFI: 1371 case ISO15693_CMD_WRITE_DSFID: 1372 case ISO15693_CMD_LOCK_DSFID: 1373 return 1; 1374 break; 1375 default: 1376 return 0; 1377 } 1378 } 1379 1380 static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) 1381 { 1382 u8 *req = skb->data; 1383 u8 special_fcn_reg1, iso_ctrl; 1384 int ret; 1385 1386 trf->issue_eof = false; 1387 1388 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in 1389 * special functions register 1 is cleared; otherwise, its a write or 1390 * sector select command and '4_bit_RX' must be set. 1391 * 1392 * When issuing an ISO 15693 command, inspect the flags byte to see 1393 * what speed to use. Also, remember if the OPTION flag is set on 1394 * a Type 5 write or lock command so the driver will know that it 1395 * has to send an EOF in order to get a response. 1396 */ 1397 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && 1398 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { 1399 if (req[0] == NFC_T2T_CMD_READ) 1400 special_fcn_reg1 = 0; 1401 else 1402 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; 1403 1404 if (special_fcn_reg1 != trf->special_fcn_reg1) { 1405 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 1406 special_fcn_reg1); 1407 if (ret) 1408 return ret; 1409 1410 trf->special_fcn_reg1 = special_fcn_reg1; 1411 } 1412 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { 1413 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; 1414 1415 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { 1416 case 0x00: 1417 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; 1418 break; 1419 case ISO15693_REQ_FLAG_SUB_CARRIER: 1420 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; 1421 break; 1422 case ISO15693_REQ_FLAG_DATA_RATE: 1423 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; 1424 break; 1425 case (ISO15693_REQ_FLAG_SUB_CARRIER | 1426 ISO15693_REQ_FLAG_DATA_RATE): 1427 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; 1428 break; 1429 } 1430 1431 if (iso_ctrl != trf->iso_ctrl) { 1432 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1433 if (ret) 1434 return ret; 1435 1436 trf->iso_ctrl = iso_ctrl; 1437 } 1438 1439 if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) { 1440 if (trf7970a_is_iso15693_write_or_lock(req[1]) && 1441 (req[0] & ISO15693_REQ_FLAG_OPTION)) 1442 trf->issue_eof = true; 1443 else if ((trf->quirks & 1444 TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) && 1445 (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK)) 1446 trf->adjust_resp_len = true; 1447 } 1448 } 1449 1450 return 0; 1451 } 1452 1453 static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, 1454 struct sk_buff *skb, u16 timeout, 1455 nfc_digital_cmd_complete_t cb, void *arg) 1456 { 1457 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1458 u8 prefix[5]; 1459 unsigned int len; 1460 int ret; 1461 u8 status; 1462 1463 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", 1464 trf->state, timeout, skb->len); 1465 1466 if (skb->len > TRF7970A_TX_MAX) 1467 return -EINVAL; 1468 1469 mutex_lock(&trf->lock); 1470 1471 if ((trf->state != TRF7970A_ST_IDLE) && 1472 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1473 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1474 trf->state); 1475 ret = -EIO; 1476 goto out_err; 1477 } 1478 1479 if (trf->aborting) { 1480 dev_dbg(trf->dev, "Abort process complete\n"); 1481 trf->aborting = false; 1482 ret = -ECANCELED; 1483 goto out_err; 1484 } 1485 1486 if (timeout) { 1487 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1488 GFP_KERNEL); 1489 if (!trf->rx_skb) { 1490 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1491 ret = -ENOMEM; 1492 goto out_err; 1493 } 1494 } 1495 1496 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { 1497 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1498 if (ret) 1499 goto out_err; 1500 1501 trf->state = TRF7970A_ST_IDLE; 1502 } 1503 1504 if (trf->is_initiator) { 1505 ret = trf7970a_per_cmd_config(trf, skb); 1506 if (ret) 1507 goto out_err; 1508 } 1509 1510 trf->ddev = ddev; 1511 trf->tx_skb = skb; 1512 trf->cb = cb; 1513 trf->cb_arg = arg; 1514 trf->timeout = timeout; 1515 trf->ignore_timeout = false; 1516 1517 len = skb->len; 1518 1519 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends 1520 * on what the current framing is, the address of the TX length byte 1 1521 * register (0x1d), and the 2 byte length of the data to be transmitted. 1522 * That totals 5 bytes. 1523 */ 1524 prefix[0] = TRF7970A_CMD_BIT_CTRL | 1525 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); 1526 prefix[1] = TRF7970A_CMD_BIT_CTRL | 1527 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); 1528 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; 1529 1530 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { 1531 prefix[3] = 0x00; 1532 prefix[4] = 0x0f; /* 7 bits */ 1533 } else { 1534 prefix[3] = (len & 0xf00) >> 4; 1535 prefix[3] |= ((len & 0xf0) >> 4); 1536 prefix[4] = ((len & 0x0f) << 4); 1537 } 1538 1539 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); 1540 1541 /* Clear possible spurious interrupt */ 1542 ret = trf7970a_read_irqstatus(trf, &status); 1543 if (ret) 1544 goto out_err; 1545 1546 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); 1547 if (ret) { 1548 kfree_skb(trf->rx_skb); 1549 trf->rx_skb = NULL; 1550 } 1551 1552 out_err: 1553 mutex_unlock(&trf->lock); 1554 return ret; 1555 } 1556 1557 static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) 1558 { 1559 int ret = 0; 1560 1561 dev_dbg(trf->dev, "rf technology: %d\n", tech); 1562 1563 switch (tech) { 1564 case NFC_DIGITAL_RF_TECH_106A: 1565 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1566 TRF7970A_ISO_CTRL_NFC_CE | 1567 TRF7970A_ISO_CTRL_NFC_CE_14443A; 1568 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; 1569 break; 1570 case NFC_DIGITAL_RF_TECH_212F: 1571 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1572 TRF7970A_ISO_CTRL_NFC_NFCF_212; 1573 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; 1574 break; 1575 case NFC_DIGITAL_RF_TECH_424F: 1576 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | 1577 TRF7970A_ISO_CTRL_NFC_NFCF_424; 1578 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10; 1579 break; 1580 default: 1581 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); 1582 return -EINVAL; 1583 } 1584 1585 trf->technology = tech; 1586 1587 /* Normally we write the ISO_CTRL register in 1588 * trf7970a_tg_config_framing() because the framing can change 1589 * the value written. However, when sending a PSL RES, 1590 * digital_tg_send_psl_res_complete() doesn't call 1591 * trf7970a_tg_config_framing() so we must write the register 1592 * here. 1593 */ 1594 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && 1595 (trf->iso_ctrl_tech != trf->iso_ctrl)) { 1596 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, 1597 trf->iso_ctrl_tech); 1598 1599 trf->iso_ctrl = trf->iso_ctrl_tech; 1600 } 1601 1602 return ret; 1603 } 1604 1605 /* Since this is a target routine, several of the framing calls are 1606 * made between receiving the request and sending the response so they 1607 * should take effect until after the response is sent. This is accomplished 1608 * by skipping the ISO_CTRL register write here and doing it in the interrupt 1609 * handler. 1610 */ 1611 static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) 1612 { 1613 u8 iso_ctrl = trf->iso_ctrl_tech; 1614 int ret; 1615 1616 dev_dbg(trf->dev, "framing: %d\n", framing); 1617 1618 switch (framing) { 1619 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: 1620 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; 1621 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; 1622 break; 1623 case NFC_DIGITAL_FRAMING_NFCA_STANDARD: 1624 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: 1625 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: 1626 /* These ones are applied in the interrupt handler */ 1627 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ 1628 break; 1629 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: 1630 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1631 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1632 break; 1633 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: 1634 trf->tx_cmd = TRF7970A_CMD_TRANSMIT; 1635 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; 1636 break; 1637 default: 1638 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); 1639 return -EINVAL; 1640 } 1641 1642 trf->framing = framing; 1643 1644 if (iso_ctrl != trf->iso_ctrl) { 1645 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); 1646 if (ret) 1647 return ret; 1648 1649 trf->iso_ctrl = iso_ctrl; 1650 1651 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 1652 trf->modulator_sys_clk_ctrl); 1653 if (ret) 1654 return ret; 1655 } 1656 1657 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { 1658 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, 1659 trf->chip_status_ctrl | 1660 TRF7970A_CHIP_STATUS_RF_ON); 1661 if (ret) 1662 return ret; 1663 1664 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; 1665 } 1666 1667 return 0; 1668 } 1669 1670 static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, 1671 int param) 1672 { 1673 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1674 int ret; 1675 1676 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); 1677 1678 mutex_lock(&trf->lock); 1679 1680 trf->is_initiator = false; 1681 1682 if ((trf->state == TRF7970A_ST_PWR_OFF) || 1683 (trf->state == TRF7970A_ST_RF_OFF)) { 1684 ret = trf7970a_switch_rf_on(trf); 1685 if (ret) 1686 goto err_unlock; 1687 } 1688 1689 switch (type) { 1690 case NFC_DIGITAL_CONFIG_RF_TECH: 1691 ret = trf7970a_tg_config_rf_tech(trf, param); 1692 break; 1693 case NFC_DIGITAL_CONFIG_FRAMING: 1694 ret = trf7970a_tg_config_framing(trf, param); 1695 break; 1696 default: 1697 dev_dbg(trf->dev, "Unknown type: %d\n", type); 1698 ret = -EINVAL; 1699 } 1700 1701 err_unlock: 1702 mutex_unlock(&trf->lock); 1703 return ret; 1704 } 1705 1706 static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1707 nfc_digital_cmd_complete_t cb, void *arg, bool mode_detect) 1708 { 1709 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1710 int ret; 1711 1712 mutex_lock(&trf->lock); 1713 1714 if ((trf->state != TRF7970A_ST_IDLE) && 1715 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { 1716 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, 1717 trf->state); 1718 ret = -EIO; 1719 goto out_err; 1720 } 1721 1722 if (trf->aborting) { 1723 dev_dbg(trf->dev, "Abort process complete\n"); 1724 trf->aborting = false; 1725 ret = -ECANCELED; 1726 goto out_err; 1727 } 1728 1729 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, 1730 GFP_KERNEL); 1731 if (!trf->rx_skb) { 1732 dev_dbg(trf->dev, "Can't alloc rx_skb\n"); 1733 ret = -ENOMEM; 1734 goto out_err; 1735 } 1736 1737 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, 1738 TRF7970A_RX_SPECIAL_SETTINGS_HBT | 1739 TRF7970A_RX_SPECIAL_SETTINGS_M848 | 1740 TRF7970A_RX_SPECIAL_SETTINGS_C424 | 1741 TRF7970A_RX_SPECIAL_SETTINGS_C212); 1742 if (ret) 1743 goto out_err; 1744 1745 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, 1746 TRF7970A_REG_IO_CTRL_VRS(0x1)); 1747 if (ret) 1748 goto out_err; 1749 1750 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, 1751 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); 1752 if (ret) 1753 goto out_err; 1754 1755 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 1756 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); 1757 if (ret) 1758 goto out_err; 1759 1760 trf->ddev = ddev; 1761 trf->cb = cb; 1762 trf->cb_arg = arg; 1763 trf->timeout = timeout; 1764 trf->ignore_timeout = false; 1765 1766 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); 1767 if (ret) 1768 goto out_err; 1769 1770 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : 1771 TRF7970A_ST_LISTENING; 1772 1773 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); 1774 1775 out_err: 1776 mutex_unlock(&trf->lock); 1777 return ret; 1778 } 1779 1780 static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, 1781 nfc_digital_cmd_complete_t cb, void *arg) 1782 { 1783 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1784 1785 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", 1786 trf->state, timeout); 1787 1788 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); 1789 } 1790 1791 static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, 1792 u16 timeout, nfc_digital_cmd_complete_t cb, void *arg) 1793 { 1794 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1795 int ret; 1796 1797 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", 1798 trf->state, timeout); 1799 1800 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, 1801 NFC_DIGITAL_RF_TECH_106A); 1802 if (ret) 1803 return ret; 1804 1805 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, 1806 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); 1807 if (ret) 1808 return ret; 1809 1810 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); 1811 } 1812 1813 static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) 1814 { 1815 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1816 1817 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", 1818 trf->state, trf->md_rf_tech); 1819 1820 *rf_tech = trf->md_rf_tech; 1821 1822 return 0; 1823 } 1824 1825 static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) 1826 { 1827 struct trf7970a *trf = nfc_digital_get_drvdata(ddev); 1828 1829 dev_dbg(trf->dev, "Abort process initiated\n"); 1830 1831 mutex_lock(&trf->lock); 1832 1833 switch (trf->state) { 1834 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1835 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1836 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1837 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1838 trf->aborting = true; 1839 break; 1840 case TRF7970A_ST_LISTENING: 1841 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); 1842 trf7970a_send_err_upstream(trf, -ECANCELED); 1843 dev_dbg(trf->dev, "Abort process complete\n"); 1844 break; 1845 default: 1846 break; 1847 } 1848 1849 mutex_unlock(&trf->lock); 1850 } 1851 1852 static struct nfc_digital_ops trf7970a_nfc_ops = { 1853 .in_configure_hw = trf7970a_in_configure_hw, 1854 .in_send_cmd = trf7970a_send_cmd, 1855 .tg_configure_hw = trf7970a_tg_configure_hw, 1856 .tg_send_cmd = trf7970a_send_cmd, 1857 .tg_listen = trf7970a_tg_listen, 1858 .tg_listen_md = trf7970a_tg_listen_md, 1859 .tg_get_rf_tech = trf7970a_tg_get_rf_tech, 1860 .switch_rf = trf7970a_switch_rf, 1861 .abort_cmd = trf7970a_abort_cmd, 1862 }; 1863 1864 static int trf7970a_power_up(struct trf7970a *trf) 1865 { 1866 int ret; 1867 1868 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); 1869 1870 if (trf->state != TRF7970A_ST_PWR_OFF) 1871 return 0; 1872 1873 ret = regulator_enable(trf->regulator); 1874 if (ret) { 1875 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); 1876 return ret; 1877 } 1878 1879 usleep_range(5000, 6000); 1880 1881 if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { 1882 gpio_set_value(trf->en2_gpio, 1); 1883 usleep_range(1000, 2000); 1884 } 1885 1886 gpio_set_value(trf->en_gpio, 1); 1887 1888 usleep_range(20000, 21000); 1889 1890 trf->state = TRF7970A_ST_RF_OFF; 1891 1892 return 0; 1893 } 1894 1895 static int trf7970a_power_down(struct trf7970a *trf) 1896 { 1897 int ret; 1898 1899 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); 1900 1901 if (trf->state == TRF7970A_ST_PWR_OFF) 1902 return 0; 1903 1904 if (trf->state != TRF7970A_ST_RF_OFF) { 1905 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", 1906 trf->state); 1907 return -EBUSY; 1908 } 1909 1910 gpio_set_value(trf->en_gpio, 0); 1911 gpio_set_value(trf->en2_gpio, 0); 1912 1913 ret = regulator_disable(trf->regulator); 1914 if (ret) 1915 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, 1916 ret); 1917 1918 trf->state = TRF7970A_ST_PWR_OFF; 1919 1920 return ret; 1921 } 1922 1923 static int trf7970a_startup(struct trf7970a *trf) 1924 { 1925 int ret; 1926 1927 ret = trf7970a_power_up(trf); 1928 if (ret) 1929 return ret; 1930 1931 pm_runtime_set_active(trf->dev); 1932 pm_runtime_enable(trf->dev); 1933 pm_runtime_mark_last_busy(trf->dev); 1934 1935 return 0; 1936 } 1937 1938 static void trf7970a_shutdown(struct trf7970a *trf) 1939 { 1940 switch (trf->state) { 1941 case TRF7970A_ST_WAIT_FOR_TX_FIFO: 1942 case TRF7970A_ST_WAIT_FOR_RX_DATA: 1943 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: 1944 case TRF7970A_ST_WAIT_TO_ISSUE_EOF: 1945 case TRF7970A_ST_LISTENING: 1946 trf7970a_send_err_upstream(trf, -ECANCELED); 1947 /* FALLTHROUGH */ 1948 case TRF7970A_ST_IDLE: 1949 case TRF7970A_ST_IDLE_RX_BLOCKED: 1950 trf7970a_switch_rf_off(trf); 1951 break; 1952 default: 1953 break; 1954 } 1955 1956 pm_runtime_disable(trf->dev); 1957 pm_runtime_set_suspended(trf->dev); 1958 1959 trf7970a_power_down(trf); 1960 } 1961 1962 static int trf7970a_get_autosuspend_delay(struct device_node *np) 1963 { 1964 int autosuspend_delay, ret; 1965 1966 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); 1967 if (ret) 1968 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; 1969 1970 return autosuspend_delay; 1971 } 1972 1973 static int trf7970a_get_vin_voltage_override(struct device_node *np, 1974 u32 *vin_uvolts) 1975 { 1976 return of_property_read_u32(np, "vin-voltage-override", vin_uvolts); 1977 } 1978 1979 static int trf7970a_probe(struct spi_device *spi) 1980 { 1981 struct device_node *np = spi->dev.of_node; 1982 struct trf7970a *trf; 1983 int uvolts, autosuspend_delay, ret; 1984 1985 if (!np) { 1986 dev_err(&spi->dev, "No Device Tree entry\n"); 1987 return -EINVAL; 1988 } 1989 1990 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); 1991 if (!trf) 1992 return -ENOMEM; 1993 1994 trf->state = TRF7970A_ST_PWR_OFF; 1995 trf->dev = &spi->dev; 1996 trf->spi = spi; 1997 1998 spi->mode = SPI_MODE_1; 1999 spi->bits_per_word = 8; 2000 2001 ret = spi_setup(spi); 2002 if (ret < 0) { 2003 dev_err(trf->dev, "Can't set up SPI Communication\n"); 2004 return ret; 2005 } 2006 2007 if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk")) 2008 trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE; 2009 2010 if (of_property_read_bool(np, "irq-status-read-quirk")) 2011 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; 2012 2013 /* There are two enable pins - both must be present */ 2014 trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0); 2015 if (!gpio_is_valid(trf->en_gpio)) { 2016 dev_err(trf->dev, "No EN GPIO property\n"); 2017 return trf->en_gpio; 2018 } 2019 2020 ret = devm_gpio_request_one(trf->dev, trf->en_gpio, 2021 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN"); 2022 if (ret) { 2023 dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret); 2024 return ret; 2025 } 2026 2027 trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1); 2028 if (!gpio_is_valid(trf->en2_gpio)) { 2029 dev_err(trf->dev, "No EN2 GPIO property\n"); 2030 return trf->en2_gpio; 2031 } 2032 2033 ret = devm_gpio_request_one(trf->dev, trf->en2_gpio, 2034 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2"); 2035 if (ret) { 2036 dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret); 2037 return ret; 2038 } 2039 2040 if (of_property_read_bool(np, "en2-rf-quirk")) 2041 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; 2042 2043 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, 2044 trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT, 2045 "trf7970a", trf); 2046 if (ret) { 2047 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); 2048 return ret; 2049 } 2050 2051 mutex_init(&trf->lock); 2052 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); 2053 2054 trf->regulator = devm_regulator_get(&spi->dev, "vin"); 2055 if (IS_ERR(trf->regulator)) { 2056 ret = PTR_ERR(trf->regulator); 2057 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); 2058 goto err_destroy_lock; 2059 } 2060 2061 ret = regulator_enable(trf->regulator); 2062 if (ret) { 2063 dev_err(trf->dev, "Can't enable VIN: %d\n", ret); 2064 goto err_destroy_lock; 2065 } 2066 2067 ret = trf7970a_get_vin_voltage_override(np, &uvolts); 2068 if (ret) 2069 uvolts = regulator_get_voltage(trf->regulator); 2070 2071 if (uvolts > 4000000) 2072 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; 2073 2074 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, 2075 TRF7970A_SUPPORTED_PROTOCOLS, 2076 NFC_DIGITAL_DRV_CAPS_IN_CRC | 2077 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 0); 2078 if (!trf->ddev) { 2079 dev_err(trf->dev, "Can't allocate NFC digital device\n"); 2080 ret = -ENOMEM; 2081 goto err_disable_regulator; 2082 } 2083 2084 nfc_digital_set_parent_dev(trf->ddev, trf->dev); 2085 nfc_digital_set_drvdata(trf->ddev, trf); 2086 spi_set_drvdata(spi, trf); 2087 2088 autosuspend_delay = trf7970a_get_autosuspend_delay(np); 2089 2090 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); 2091 pm_runtime_use_autosuspend(trf->dev); 2092 2093 ret = trf7970a_startup(trf); 2094 if (ret) 2095 goto err_free_ddev; 2096 2097 ret = nfc_digital_register_device(trf->ddev); 2098 if (ret) { 2099 dev_err(trf->dev, "Can't register NFC digital device: %d\n", 2100 ret); 2101 goto err_shutdown; 2102 } 2103 2104 return 0; 2105 2106 err_shutdown: 2107 trf7970a_shutdown(trf); 2108 err_free_ddev: 2109 nfc_digital_free_device(trf->ddev); 2110 err_disable_regulator: 2111 regulator_disable(trf->regulator); 2112 err_destroy_lock: 2113 mutex_destroy(&trf->lock); 2114 return ret; 2115 } 2116 2117 static int trf7970a_remove(struct spi_device *spi) 2118 { 2119 struct trf7970a *trf = spi_get_drvdata(spi); 2120 2121 mutex_lock(&trf->lock); 2122 2123 trf7970a_shutdown(trf); 2124 2125 mutex_unlock(&trf->lock); 2126 2127 nfc_digital_unregister_device(trf->ddev); 2128 nfc_digital_free_device(trf->ddev); 2129 2130 regulator_disable(trf->regulator); 2131 2132 mutex_destroy(&trf->lock); 2133 2134 return 0; 2135 } 2136 2137 #ifdef CONFIG_PM_SLEEP 2138 static int trf7970a_suspend(struct device *dev) 2139 { 2140 struct spi_device *spi = container_of(dev, struct spi_device, dev); 2141 struct trf7970a *trf = spi_get_drvdata(spi); 2142 2143 dev_dbg(dev, "Suspend\n"); 2144 2145 mutex_lock(&trf->lock); 2146 2147 trf7970a_shutdown(trf); 2148 2149 mutex_unlock(&trf->lock); 2150 2151 return 0; 2152 } 2153 2154 static int trf7970a_resume(struct device *dev) 2155 { 2156 struct spi_device *spi = container_of(dev, struct spi_device, dev); 2157 struct trf7970a *trf = spi_get_drvdata(spi); 2158 int ret; 2159 2160 dev_dbg(dev, "Resume\n"); 2161 2162 mutex_lock(&trf->lock); 2163 2164 ret = trf7970a_startup(trf); 2165 2166 mutex_unlock(&trf->lock); 2167 2168 return ret; 2169 } 2170 #endif 2171 2172 #ifdef CONFIG_PM 2173 static int trf7970a_pm_runtime_suspend(struct device *dev) 2174 { 2175 struct spi_device *spi = container_of(dev, struct spi_device, dev); 2176 struct trf7970a *trf = spi_get_drvdata(spi); 2177 int ret; 2178 2179 dev_dbg(dev, "Runtime suspend\n"); 2180 2181 mutex_lock(&trf->lock); 2182 2183 ret = trf7970a_power_down(trf); 2184 2185 mutex_unlock(&trf->lock); 2186 2187 return ret; 2188 } 2189 2190 static int trf7970a_pm_runtime_resume(struct device *dev) 2191 { 2192 struct spi_device *spi = container_of(dev, struct spi_device, dev); 2193 struct trf7970a *trf = spi_get_drvdata(spi); 2194 int ret; 2195 2196 dev_dbg(dev, "Runtime resume\n"); 2197 2198 ret = trf7970a_power_up(trf); 2199 if (!ret) 2200 pm_runtime_mark_last_busy(dev); 2201 2202 return ret; 2203 } 2204 #endif 2205 2206 static const struct dev_pm_ops trf7970a_pm_ops = { 2207 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) 2208 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, 2209 trf7970a_pm_runtime_resume, NULL) 2210 }; 2211 2212 static const struct spi_device_id trf7970a_id_table[] = { 2213 { "trf7970a", 0 }, 2214 { } 2215 }; 2216 MODULE_DEVICE_TABLE(spi, trf7970a_id_table); 2217 2218 static struct spi_driver trf7970a_spi_driver = { 2219 .probe = trf7970a_probe, 2220 .remove = trf7970a_remove, 2221 .id_table = trf7970a_id_table, 2222 .driver = { 2223 .name = "trf7970a", 2224 .owner = THIS_MODULE, 2225 .pm = &trf7970a_pm_ops, 2226 }, 2227 }; 2228 2229 module_spi_driver(trf7970a_spi_driver); 2230 2231 MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); 2232 MODULE_LICENSE("GPL v2"); 2233 MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); 2234