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(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
 412enum 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
 426struct 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
 460static 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
 474static 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
 489static 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
 517static 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
 532static 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
 556static 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
 575static 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
 608static 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		if (trf->rx_skb)
 633			skb_trim(trf->rx_skb, trf->rx_skb->len - 1);
 634
 635		trf->adjust_resp_len = false;
 636	}
 637
 638	trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
 639
 640	trf->rx_skb = NULL;
 641}
 642
 643static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)
 644{
 645	dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno);
 646
 647	cancel_delayed_work(&trf->timeout_work);
 648
 649	kfree_skb(trf->rx_skb);
 650	trf->rx_skb = ERR_PTR(errno);
 651
 652	trf7970a_send_upstream(trf);
 653}
 654
 655static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
 656		unsigned int len, u8 *prefix, unsigned int prefix_len)
 
 657{
 658	struct spi_transfer t[2];
 659	struct spi_message m;
 660	unsigned int timeout;
 661	int ret;
 662
 663	print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE,
 664			16, 1, skb->data, len, false);
 665
 666	spi_message_init(&m);
 667
 668	memset(&t, 0, sizeof(t));
 669
 670	t[0].tx_buf = prefix;
 671	t[0].len = prefix_len;
 672	spi_message_add_tail(&t[0], &m);
 673
 674	t[1].tx_buf = skb->data;
 675	t[1].len = len;
 676	spi_message_add_tail(&t[1], &m);
 677
 678	ret = spi_sync(trf->spi, &m);
 679	if (ret) {
 680		dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__,
 681				ret);
 682		return ret;
 683	}
 684
 685	skb_pull(skb, len);
 686
 687	if (skb->len > 0) {
 688		trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO;
 689		timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT;
 690	} else {
 691		if (trf->issue_eof) {
 692			trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF;
 693			timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF;
 694		} else {
 695			trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
 696
 697			if (!trf->timeout)
 698				timeout = TRF7970A_WAIT_FOR_TX_IRQ;
 699			else
 700				timeout = trf->timeout;
 701		}
 702	}
 703
 704	dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout,
 705			trf->state);
 706
 707	schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
 708
 709	return 0;
 710}
 711
 712static void trf7970a_fill_fifo(struct trf7970a *trf)
 713{
 714	struct sk_buff *skb = trf->tx_skb;
 715	unsigned int len;
 716	int ret;
 717	u8 fifo_bytes;
 718	u8 prefix;
 719
 720	ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
 721	if (ret) {
 722		trf7970a_send_err_upstream(trf, ret);
 723		return;
 724	}
 725
 726	dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
 727
 728	fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
 729
 730	/* Calculate how much more data can be written to the fifo */
 731	len = TRF7970A_FIFO_SIZE - fifo_bytes;
 732	if (!len) {
 733		schedule_delayed_work(&trf->timeout_work,
 734			msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
 735		return;
 736	}
 737
 738	len = min(skb->len, len);
 739
 740	prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER;
 741
 742	ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix));
 743	if (ret)
 744		trf7970a_send_err_upstream(trf, ret);
 745}
 746
 747static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)
 748{
 749	struct sk_buff *skb = trf->rx_skb;
 750	int ret;
 751	u8 fifo_bytes;
 752
 753	if (status & TRF7970A_IRQ_STATUS_ERROR) {
 754		trf7970a_send_err_upstream(trf, -EIO);
 755		return;
 756	}
 757
 758	ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
 759	if (ret) {
 760		trf7970a_send_err_upstream(trf, ret);
 761		return;
 762	}
 763
 764	dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
 765
 766	fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
 767
 768	if (!fifo_bytes)
 769		goto no_rx_data;
 770
 771	if (fifo_bytes > skb_tailroom(skb)) {
 772		skb = skb_copy_expand(skb, skb_headroom(skb),
 773				max_t(int, fifo_bytes,
 774					TRF7970A_RX_SKB_ALLOC_SIZE),
 775				GFP_KERNEL);
 776		if (!skb) {
 777			trf7970a_send_err_upstream(trf, -ENOMEM);
 778			return;
 779		}
 780
 781		kfree_skb(trf->rx_skb);
 782		trf->rx_skb = skb;
 783	}
 784
 785	ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,
 786			skb_put(skb, fifo_bytes), fifo_bytes);
 787	if (ret) {
 788		trf7970a_send_err_upstream(trf, ret);
 789		return;
 790	}
 791
 792	/* If received Type 2 ACK/NACK, shift right 4 bits and pass up */
 793	if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) &&
 794			(trf->special_fcn_reg1 ==
 795				 TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {
 796		skb->data[0] >>= 4;
 797		status = TRF7970A_IRQ_STATUS_SRX;
 798	} else {
 799		trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT;
 800
 801		ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
 802		if (ret) {
 803			trf7970a_send_err_upstream(trf, ret);
 804			return;
 805		}
 806
 807		fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
 808
 809		/* If there are bytes in the FIFO, set status to '0' so
 810		 * the if stmt below doesn't fire and the driver will wait
 811		 * for the trf7970a to generate another RX interrupt.
 812		 */
 813		if (fifo_bytes)
 814			status = 0;
 815	}
 816
 817no_rx_data:
 818	if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */
 819		trf7970a_send_upstream(trf);
 820		return;
 821	}
 822
 823	dev_dbg(trf->dev, "Setting timeout for %d ms\n",
 824			TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT);
 825
 826	schedule_delayed_work(&trf->timeout_work,
 827			msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT));
 828}
 829
 830static irqreturn_t trf7970a_irq(int irq, void *dev_id)
 831{
 832	struct trf7970a *trf = dev_id;
 833	int ret;
 834	u8 status, fifo_bytes, iso_ctrl;
 835
 836	mutex_lock(&trf->lock);
 837
 838	if (trf->state == TRF7970A_ST_RF_OFF) {
 839		mutex_unlock(&trf->lock);
 840		return IRQ_NONE;
 841	}
 842
 843	ret = trf7970a_read_irqstatus(trf, &status);
 844	if (ret) {
 845		mutex_unlock(&trf->lock);
 846		return IRQ_NONE;
 847	}
 848
 849	dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state,
 850			status);
 851
 852	if (!status) {
 853		mutex_unlock(&trf->lock);
 854		return IRQ_NONE;
 855	}
 856
 857	switch (trf->state) {
 858	case TRF7970A_ST_IDLE:
 859	case TRF7970A_ST_IDLE_RX_BLOCKED:
 860		/* If initiator and getting interrupts caused by RF noise,
 861		 * turn off the receiver to avoid unnecessary interrupts.
 862		 * It will be turned back on in trf7970a_send_cmd() when
 863		 * the next command is issued.
 864		 */
 865		if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) {
 866			trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);
 867			trf->state = TRF7970A_ST_IDLE_RX_BLOCKED;
 868		}
 869
 870		trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
 871		break;
 872	case TRF7970A_ST_WAIT_FOR_TX_FIFO:
 873		if (status & TRF7970A_IRQ_STATUS_TX) {
 874			trf->ignore_timeout =
 875				!cancel_delayed_work(&trf->timeout_work);
 876			trf7970a_fill_fifo(trf);
 877		} else {
 878			trf7970a_send_err_upstream(trf, -EIO);
 879		}
 880		break;
 881	case TRF7970A_ST_WAIT_FOR_RX_DATA:
 882	case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
 883		if (status & TRF7970A_IRQ_STATUS_SRX) {
 884			trf->ignore_timeout =
 885				!cancel_delayed_work(&trf->timeout_work);
 886			trf7970a_drain_fifo(trf, status);
 887		} else if (status & TRF7970A_IRQ_STATUS_FIFO) {
 888			ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,
 889					&fifo_bytes);
 890
 891			fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
 892
 893			if (ret)
 894				trf7970a_send_err_upstream(trf, ret);
 895			else if (!fifo_bytes)
 896				trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
 897		} else if ((status == TRF7970A_IRQ_STATUS_TX) ||
 898				(!trf->is_initiator &&
 899				 (status == (TRF7970A_IRQ_STATUS_TX |
 900					     TRF7970A_IRQ_STATUS_NFC_RF)))) {
 901			trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
 902
 903			if (!trf->timeout) {
 904				trf->ignore_timeout = !cancel_delayed_work(
 905						&trf->timeout_work);
 906				trf->rx_skb = ERR_PTR(0);
 907				trf7970a_send_upstream(trf);
 908				break;
 909			}
 910
 911			if (trf->is_initiator)
 912				break;
 913
 914			iso_ctrl = trf->iso_ctrl;
 915
 916			switch (trf->framing) {
 917			case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
 918				trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
 919				iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
 920				trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
 921				break;
 922			case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
 923				trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
 924				iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
 925				trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
 926				break;
 927			case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
 928				ret = trf7970a_write(trf,
 929					TRF7970A_SPECIAL_FCN_REG1,
 930					TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL);
 931				if (ret)
 932					goto err_unlock_exit;
 933
 934				trf->special_fcn_reg1 =
 935					TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL;
 936				break;
 937			default:
 938				break;
 939			}
 940
 941			if (iso_ctrl != trf->iso_ctrl) {
 942				ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
 943						iso_ctrl);
 944				if (ret)
 945					goto err_unlock_exit;
 946
 947				trf->iso_ctrl = iso_ctrl;
 948			}
 949		} else {
 950			trf7970a_send_err_upstream(trf, -EIO);
 951		}
 952		break;
 953	case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
 954		if (status != TRF7970A_IRQ_STATUS_TX)
 955			trf7970a_send_err_upstream(trf, -EIO);
 956		break;
 957	case TRF7970A_ST_LISTENING:
 958		if (status & TRF7970A_IRQ_STATUS_SRX) {
 959			trf->ignore_timeout =
 960				!cancel_delayed_work(&trf->timeout_work);
 961			trf7970a_drain_fifo(trf, status);
 962		} else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
 963			trf7970a_send_err_upstream(trf, -EIO);
 964		}
 965		break;
 966	case TRF7970A_ST_LISTENING_MD:
 967		if (status & TRF7970A_IRQ_STATUS_SRX) {
 968			trf->ignore_timeout =
 969				!cancel_delayed_work(&trf->timeout_work);
 970
 971			ret = trf7970a_mode_detect(trf, &trf->md_rf_tech);
 972			if (ret) {
 973				trf7970a_send_err_upstream(trf, ret);
 974			} else {
 975				trf->state = TRF7970A_ST_LISTENING;
 976				trf7970a_drain_fifo(trf, status);
 977			}
 978		} else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
 979			trf7970a_send_err_upstream(trf, -EIO);
 980		}
 981		break;
 982	default:
 983		dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
 984				__func__, trf->state);
 985	}
 986
 987err_unlock_exit:
 988	mutex_unlock(&trf->lock);
 989	return IRQ_HANDLED;
 990}
 991
 992static void trf7970a_issue_eof(struct trf7970a *trf)
 993{
 994	int ret;
 995
 996	dev_dbg(trf->dev, "Issuing EOF\n");
 997
 998	ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
 999	if (ret)
1000		trf7970a_send_err_upstream(trf, ret);
1001
1002	ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
1003	if (ret)
1004		trf7970a_send_err_upstream(trf, ret);
1005
1006	trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
1007
1008	dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n",
1009			trf->timeout, trf->state);
1010
1011	schedule_delayed_work(&trf->timeout_work,
1012			msecs_to_jiffies(trf->timeout));
1013}
1014
1015static void trf7970a_timeout_work_handler(struct work_struct *work)
1016{
1017	struct trf7970a *trf = container_of(work, struct trf7970a,
1018			timeout_work.work);
1019
1020	dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n",
1021			trf->state, trf->ignore_timeout);
1022
1023	mutex_lock(&trf->lock);
1024
1025	if (trf->ignore_timeout)
1026		trf->ignore_timeout = false;
1027	else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)
1028		trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);
1029	else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
1030		trf7970a_issue_eof(trf);
1031	else
1032		trf7970a_send_err_upstream(trf, -ETIMEDOUT);
1033
1034	mutex_unlock(&trf->lock);
1035}
1036
1037static int trf7970a_init(struct trf7970a *trf)
1038{
1039	int ret;
1040
1041	dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state);
1042
1043	ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);
1044	if (ret)
1045		goto err_out;
1046
1047	ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);
1048	if (ret)
1049		goto err_out;
1050
 
 
 
 
 
 
 
 
 
1051	usleep_range(1000, 2000);
1052
1053	trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1054
1055	ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 0);
 
1056	if (ret)
1057		goto err_out;
1058
1059	trf->modulator_sys_clk_ctrl = 0;
1060
1061	ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,
1062			TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |
1063			TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32);
1064	if (ret)
1065		goto err_out;
1066
1067	ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);
1068	if (ret)
1069		goto err_out;
1070
1071	trf->special_fcn_reg1 = 0;
1072
1073	trf->iso_ctrl = 0xff;
1074	return 0;
1075
1076err_out:
1077	dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
1078	return ret;
1079}
1080
1081static void trf7970a_switch_rf_off(struct trf7970a *trf)
1082{
1083	if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1084			(trf->state == TRF7970A_ST_RF_OFF))
1085		return;
1086
1087	dev_dbg(trf->dev, "Switching rf off\n");
1088
1089	trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1090
1091	trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl);
1092
1093	trf->aborting = false;
1094	trf->state = TRF7970A_ST_RF_OFF;
1095
1096	pm_runtime_mark_last_busy(trf->dev);
1097	pm_runtime_put_autosuspend(trf->dev);
1098}
1099
1100static int trf7970a_switch_rf_on(struct trf7970a *trf)
1101{
1102	int ret;
1103
1104	dev_dbg(trf->dev, "Switching rf on\n");
1105
1106	pm_runtime_get_sync(trf->dev);
1107
1108	if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */
1109		dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__,
1110				trf->state);
1111		return -EINVAL;
1112	}
1113
1114	ret = trf7970a_init(trf);
1115	if (ret) {
1116		dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret);
1117		return ret;
1118	}
1119
1120	trf->state = TRF7970A_ST_IDLE;
1121
1122	return 0;
1123}
1124
1125static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
1126{
1127	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1128	int ret = 0;
1129
1130	dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on);
1131
1132	mutex_lock(&trf->lock);
1133
1134	if (on) {
1135		switch (trf->state) {
1136		case TRF7970A_ST_PWR_OFF:
1137		case TRF7970A_ST_RF_OFF:
1138			ret = trf7970a_switch_rf_on(trf);
1139			break;
1140		case TRF7970A_ST_IDLE:
1141		case TRF7970A_ST_IDLE_RX_BLOCKED:
1142			break;
1143		default:
1144			dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1145					__func__, trf->state, on);
1146			trf7970a_switch_rf_off(trf);
1147			ret = -EINVAL;
1148		}
1149	} else {
1150		switch (trf->state) {
1151		case TRF7970A_ST_PWR_OFF:
1152		case TRF7970A_ST_RF_OFF:
1153			break;
1154		default:
1155			dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1156					__func__, trf->state, on);
1157			ret = -EINVAL;
1158			/* FALLTHROUGH */
1159		case TRF7970A_ST_IDLE:
1160		case TRF7970A_ST_IDLE_RX_BLOCKED:
1161		case TRF7970A_ST_WAIT_FOR_RX_DATA:
1162		case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1163			trf7970a_switch_rf_off(trf);
1164		}
1165	}
1166
1167	mutex_unlock(&trf->lock);
1168	return ret;
1169}
1170
1171static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
1172{
1173	int ret = 0;
1174
1175	dev_dbg(trf->dev, "rf technology: %d\n", tech);
1176
1177	switch (tech) {
1178	case NFC_DIGITAL_RF_TECH_106A:
1179		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
1180		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
 
 
1181		trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
1182		break;
1183	case NFC_DIGITAL_RF_TECH_106B:
1184		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;
1185		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
 
 
1186		trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
1187		break;
1188	case NFC_DIGITAL_RF_TECH_212F:
1189		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;
1190		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
 
 
1191		trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
1192		break;
1193	case NFC_DIGITAL_RF_TECH_424F:
1194		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;
1195		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
 
 
1196		trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
1197		break;
1198	case NFC_DIGITAL_RF_TECH_ISO15693:
1199		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1200		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
 
 
1201		trf->guard_time = TRF7970A_GUARD_TIME_15693;
1202		break;
1203	default:
1204		dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1205		return -EINVAL;
1206	}
1207
1208	trf->technology = tech;
1209
1210	/* If in initiator mode and not changing the RF tech due to a
1211	 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from
1212	 * trf7970a_init()), clear the NFC Target Detection Level register
1213	 * due to erratum.
1214	 */
1215	if (trf->iso_ctrl == 0xff)
1216		ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1217
1218	return ret;
1219}
1220
1221static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)
1222{
1223	int ret;
1224	u8 rssi;
1225
1226	ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1227			trf->chip_status_ctrl | TRF7970A_CHIP_STATUS_REC_ON);
 
1228	if (ret)
1229		return ret;
1230
1231	ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);
1232	if (ret)
1233		return ret;
1234
1235	usleep_range(50, 60);
1236
1237	ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi);
1238	if (ret)
1239		return ret;
1240
1241	ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1242			trf->chip_status_ctrl);
1243	if (ret)
1244		return ret;
1245
1246	if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK)
1247		*is_rf_field = true;
1248	else
1249		*is_rf_field = false;
1250
1251	return 0;
1252}
1253
1254static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)
1255{
1256	u8 iso_ctrl = trf->iso_ctrl_tech;
1257	bool is_rf_field = false;
1258	int ret;
1259
1260	dev_dbg(trf->dev, "framing: %d\n", framing);
1261
1262	switch (framing) {
1263	case NFC_DIGITAL_FRAMING_NFCA_SHORT:
1264	case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1265		trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1266		iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1267		break;
1268	case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1269	case NFC_DIGITAL_FRAMING_NFCA_T4T:
1270	case NFC_DIGITAL_FRAMING_NFCB:
1271	case NFC_DIGITAL_FRAMING_NFCB_T4T:
1272	case NFC_DIGITAL_FRAMING_NFCF:
1273	case NFC_DIGITAL_FRAMING_NFCF_T3T:
1274	case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
1275	case NFC_DIGITAL_FRAMING_ISO15693_T5T:
1276	case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1277	case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1278		trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1279		iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1280		break;
1281	case NFC_DIGITAL_FRAMING_NFCA_T2T:
1282		trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1283		iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1284		break;
1285	default:
1286		dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1287		return -EINVAL;
1288	}
1289
1290	trf->framing = framing;
1291
1292	if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1293		ret = trf7970a_is_rf_field(trf, &is_rf_field);
1294		if (ret)
1295			return ret;
1296
1297		if (is_rf_field)
1298			return -EBUSY;
1299	}
1300
1301	if (iso_ctrl != trf->iso_ctrl) {
1302		ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1303		if (ret)
1304			return ret;
1305
1306		trf->iso_ctrl = iso_ctrl;
1307
1308		ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1309				trf->modulator_sys_clk_ctrl);
1310		if (ret)
1311			return ret;
1312	}
1313
1314	if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1315		ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1316				trf->chip_status_ctrl |
1317					TRF7970A_CHIP_STATUS_RF_ON);
1318		if (ret)
1319			return ret;
1320
1321		trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1322
1323		usleep_range(trf->guard_time, trf->guard_time + 1000);
1324	}
1325
1326	return 0;
1327}
1328
1329static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,
1330		int param)
1331{
1332	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1333	int ret;
1334
1335	dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1336
1337	mutex_lock(&trf->lock);
1338
1339	trf->is_initiator = true;
1340
1341	if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1342			(trf->state == TRF7970A_ST_RF_OFF)) {
1343		ret = trf7970a_switch_rf_on(trf);
1344		if (ret)
1345			goto err_unlock;
1346	}
1347
1348	switch (type) {
1349	case NFC_DIGITAL_CONFIG_RF_TECH:
1350		ret = trf7970a_in_config_rf_tech(trf, param);
1351		break;
1352	case NFC_DIGITAL_CONFIG_FRAMING:
1353		ret = trf7970a_in_config_framing(trf, param);
1354		break;
1355	default:
1356		dev_dbg(trf->dev, "Unknown type: %d\n", type);
1357		ret = -EINVAL;
1358	}
1359
1360err_unlock:
1361	mutex_unlock(&trf->lock);
1362	return ret;
1363}
1364
1365static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
1366{
1367	switch (cmd) {
1368	case ISO15693_CMD_WRITE_SINGLE_BLOCK:
1369	case ISO15693_CMD_LOCK_BLOCK:
1370	case ISO15693_CMD_WRITE_MULTIPLE_BLOCK:
1371	case ISO15693_CMD_WRITE_AFI:
1372	case ISO15693_CMD_LOCK_AFI:
1373	case ISO15693_CMD_WRITE_DSFID:
1374	case ISO15693_CMD_LOCK_DSFID:
1375		return 1;
1376		break;
1377	default:
1378		return 0;
1379	}
1380}
1381
1382static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
 
1383{
1384	u8 *req = skb->data;
1385	u8 special_fcn_reg1, iso_ctrl;
1386	int ret;
1387
1388	trf->issue_eof = false;
1389
1390	/* When issuing Type 2 read command, make sure the '4_bit_RX' bit in
1391	 * special functions register 1 is cleared; otherwise, its a write or
1392	 * sector select command and '4_bit_RX' must be set.
1393	 *
1394	 * When issuing an ISO 15693 command, inspect the flags byte to see
1395	 * what speed to use.  Also, remember if the OPTION flag is set on
1396	 * a Type 5 write or lock command so the driver will know that it
1397	 * has to send an EOF in order to get a response.
1398	 */
1399	if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) &&
1400			(trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {
1401		if (req[0] == NFC_T2T_CMD_READ)
1402			special_fcn_reg1 = 0;
1403		else
1404			special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX;
1405
1406		if (special_fcn_reg1 != trf->special_fcn_reg1) {
1407			ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,
1408					special_fcn_reg1);
1409			if (ret)
1410				return ret;
1411
1412			trf->special_fcn_reg1 = special_fcn_reg1;
1413		}
1414	} else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) {
1415		iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;
1416
1417		switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) {
1418		case 0x00:
1419			iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662;
1420			break;
1421		case ISO15693_REQ_FLAG_SUB_CARRIER:
1422			iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a;
1423			break;
1424		case ISO15693_REQ_FLAG_DATA_RATE:
1425			iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1426			break;
1427		case (ISO15693_REQ_FLAG_SUB_CARRIER |
1428				ISO15693_REQ_FLAG_DATA_RATE):
1429			iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669;
1430			break;
1431		}
1432
1433		if (iso_ctrl != trf->iso_ctrl) {
1434			ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1435			if (ret)
1436				return ret;
1437
1438			trf->iso_ctrl = iso_ctrl;
1439		}
1440
1441		if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) {
1442			if (trf7970a_is_iso15693_write_or_lock(req[1]) &&
1443					(req[0] & ISO15693_REQ_FLAG_OPTION))
1444				trf->issue_eof = true;
1445			else if ((trf->quirks &
1446					TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) &&
1447				 (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK))
1448				trf->adjust_resp_len = true;
1449		}
1450	}
1451
1452	return 0;
1453}
1454
1455static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,
1456		struct sk_buff *skb, u16 timeout,
1457		nfc_digital_cmd_complete_t cb, void *arg)
1458{
1459	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1460	u8 prefix[5];
1461	unsigned int len;
1462	int ret;
1463	u8 status;
1464
1465	dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
1466			trf->state, timeout, skb->len);
1467
1468	if (skb->len > TRF7970A_TX_MAX)
1469		return -EINVAL;
1470
1471	mutex_lock(&trf->lock);
1472
1473	if ((trf->state != TRF7970A_ST_IDLE) &&
1474			(trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1475		dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1476				trf->state);
1477		ret = -EIO;
1478		goto out_err;
1479	}
1480
1481	if (trf->aborting) {
1482		dev_dbg(trf->dev, "Abort process complete\n");
1483		trf->aborting = false;
1484		ret = -ECANCELED;
1485		goto out_err;
1486	}
1487
1488	if (timeout) {
1489		trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1490				GFP_KERNEL);
1491		if (!trf->rx_skb) {
1492			dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1493			ret = -ENOMEM;
1494			goto out_err;
1495		}
1496	}
1497
1498	if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) {
1499		ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1500		if (ret)
1501			goto out_err;
1502
1503		trf->state = TRF7970A_ST_IDLE;
1504	}
1505
1506	if (trf->is_initiator) {
1507		ret = trf7970a_per_cmd_config(trf, skb);
1508		if (ret)
1509			goto out_err;
1510	}
1511
1512	trf->ddev = ddev;
1513	trf->tx_skb = skb;
1514	trf->cb = cb;
1515	trf->cb_arg = arg;
1516	trf->timeout = timeout;
1517	trf->ignore_timeout = false;
1518
1519	len = skb->len;
1520
1521	/* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
1522	 * on what the current framing is, the address of the TX length byte 1
1523	 * register (0x1d), and the 2 byte length of the data to be transmitted.
1524	 * That totals 5 bytes.
1525	 */
1526	prefix[0] = TRF7970A_CMD_BIT_CTRL |
1527			TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET);
1528	prefix[1] = TRF7970A_CMD_BIT_CTRL |
1529			TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd);
1530	prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1;
1531
1532	if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {
1533		prefix[3] = 0x00;
1534		prefix[4] = 0x0f; /* 7 bits */
1535	} else {
1536		prefix[3] = (len & 0xf00) >> 4;
1537		prefix[3] |= ((len & 0xf0) >> 4);
1538		prefix[4] = ((len & 0x0f) << 4);
1539	}
1540
1541	len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
1542
1543	/* Clear possible spurious interrupt */
1544	ret = trf7970a_read_irqstatus(trf, &status);
1545	if (ret)
1546		goto out_err;
1547
1548	ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));
1549	if (ret) {
1550		kfree_skb(trf->rx_skb);
1551		trf->rx_skb = NULL;
1552	}
1553
1554out_err:
1555	mutex_unlock(&trf->lock);
1556	return ret;
1557}
1558
1559static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)
1560{
1561	int ret = 0;
1562
1563	dev_dbg(trf->dev, "rf technology: %d\n", tech);
1564
1565	switch (tech) {
1566	case NFC_DIGITAL_RF_TECH_106A:
1567		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1568			TRF7970A_ISO_CTRL_NFC_CE |
1569			TRF7970A_ISO_CTRL_NFC_CE_14443A;
1570		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
 
1571		break;
1572	case NFC_DIGITAL_RF_TECH_212F:
1573		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1574			TRF7970A_ISO_CTRL_NFC_NFCF_212;
1575		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
 
 
1576		break;
1577	case NFC_DIGITAL_RF_TECH_424F:
1578		trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1579			TRF7970A_ISO_CTRL_NFC_NFCF_424;
1580		trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
 
 
1581		break;
1582	default:
1583		dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1584		return -EINVAL;
1585	}
1586
1587	trf->technology = tech;
1588
1589	/* Normally we write the ISO_CTRL register in
1590	 * trf7970a_tg_config_framing() because the framing can change
1591	 * the value written.  However, when sending a PSL RES,
1592	 * digital_tg_send_psl_res_complete() doesn't call
1593	 * trf7970a_tg_config_framing() so we must write the register
1594	 * here.
1595	 */
1596	if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) &&
1597			(trf->iso_ctrl_tech != trf->iso_ctrl)) {
1598		ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
1599				trf->iso_ctrl_tech);
1600
1601		trf->iso_ctrl = trf->iso_ctrl_tech;
1602	}
1603
1604	return ret;
1605}
1606
1607/* Since this is a target routine, several of the framing calls are
1608 * made between receiving the request and sending the response so they
1609 * should take effect until after the response is sent.  This is accomplished
1610 * by skipping the ISO_CTRL register write here and doing it in the interrupt
1611 * handler.
1612 */
1613static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing)
1614{
1615	u8 iso_ctrl = trf->iso_ctrl_tech;
1616	int ret;
1617
1618	dev_dbg(trf->dev, "framing: %d\n", framing);
1619
1620	switch (framing) {
1621	case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1622		trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1623		iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1624		break;
1625	case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1626	case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1627	case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
1628		/* These ones are applied in the interrupt handler */
1629		iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */
1630		break;
1631	case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1632		trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1633		iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1634		break;
1635	case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED:
1636		trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1637		iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1638		break;
1639	default:
1640		dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1641		return -EINVAL;
1642	}
1643
1644	trf->framing = framing;
1645
1646	if (iso_ctrl != trf->iso_ctrl) {
1647		ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1648		if (ret)
1649			return ret;
1650
1651		trf->iso_ctrl = iso_ctrl;
1652
1653		ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1654				trf->modulator_sys_clk_ctrl);
1655		if (ret)
1656			return ret;
1657	}
1658
1659	if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1660		ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1661				trf->chip_status_ctrl |
1662					TRF7970A_CHIP_STATUS_RF_ON);
1663		if (ret)
1664			return ret;
1665
1666		trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1667	}
1668
1669	return 0;
1670}
1671
1672static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
1673		int param)
1674{
1675	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1676	int ret;
1677
1678	dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1679
1680	mutex_lock(&trf->lock);
1681
1682	trf->is_initiator = false;
1683
1684	if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1685			(trf->state == TRF7970A_ST_RF_OFF)) {
1686		ret = trf7970a_switch_rf_on(trf);
1687		if (ret)
1688			goto err_unlock;
1689	}
1690
1691	switch (type) {
1692	case NFC_DIGITAL_CONFIG_RF_TECH:
1693		ret = trf7970a_tg_config_rf_tech(trf, param);
1694		break;
1695	case NFC_DIGITAL_CONFIG_FRAMING:
1696		ret = trf7970a_tg_config_framing(trf, param);
1697		break;
1698	default:
1699		dev_dbg(trf->dev, "Unknown type: %d\n", type);
1700		ret = -EINVAL;
1701	}
1702
1703err_unlock:
1704	mutex_unlock(&trf->lock);
1705	return ret;
1706}
1707
1708static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1709		nfc_digital_cmd_complete_t cb, void *arg, bool mode_detect)
 
1710{
1711	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1712	int ret;
1713
1714	mutex_lock(&trf->lock);
1715
1716	if ((trf->state != TRF7970A_ST_IDLE) &&
1717			(trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1718		dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1719				trf->state);
1720		ret = -EIO;
1721		goto out_err;
1722	}
1723
1724	if (trf->aborting) {
1725		dev_dbg(trf->dev, "Abort process complete\n");
1726		trf->aborting = false;
1727		ret = -ECANCELED;
1728		goto out_err;
1729	}
1730
1731	trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1732			GFP_KERNEL);
1733	if (!trf->rx_skb) {
1734		dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1735		ret = -ENOMEM;
1736		goto out_err;
1737	}
1738
1739	ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS,
1740			TRF7970A_RX_SPECIAL_SETTINGS_HBT |
1741			TRF7970A_RX_SPECIAL_SETTINGS_M848 |
1742			TRF7970A_RX_SPECIAL_SETTINGS_C424 |
1743			TRF7970A_RX_SPECIAL_SETTINGS_C212);
1744	if (ret)
1745		goto out_err;
1746
1747	ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
1748			TRF7970A_REG_IO_CTRL_VRS(0x1));
1749	if (ret)
1750		goto out_err;
1751
1752	ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL,
1753			TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3));
1754	if (ret)
1755		goto out_err;
1756
1757	ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL,
1758			TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7));
1759	if (ret)
1760		goto out_err;
1761
1762	trf->ddev = ddev;
1763	trf->cb = cb;
1764	trf->cb_arg = arg;
1765	trf->timeout = timeout;
1766	trf->ignore_timeout = false;
1767
1768	ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1769	if (ret)
1770		goto out_err;
1771
1772	trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD :
1773				   TRF7970A_ST_LISTENING;
1774
1775	schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
1776
1777out_err:
1778	mutex_unlock(&trf->lock);
1779	return ret;
1780}
1781
1782static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1783		nfc_digital_cmd_complete_t cb, void *arg)
1784{
1785	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1786
1787	dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n",
1788			trf->state, timeout);
1789
1790	return _trf7970a_tg_listen(ddev, timeout, cb, arg, false);
1791}
1792
1793static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev,
1794		u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
 
1795{
1796	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1797	int ret;
1798
1799	dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n",
1800			trf->state, timeout);
1801
1802	ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1803			NFC_DIGITAL_RF_TECH_106A);
1804	if (ret)
1805		return ret;
1806
1807	ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1808			NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1809	if (ret)
1810		return ret;
1811
1812	return _trf7970a_tg_listen(ddev, timeout, cb, arg, true);
1813}
1814
1815static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech)
1816{
1817	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1818
1819	dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n",
1820			trf->state, trf->md_rf_tech);
1821
1822	*rf_tech = trf->md_rf_tech;
1823
1824	return 0;
1825}
1826
1827static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)
1828{
1829	struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1830
1831	dev_dbg(trf->dev, "Abort process initiated\n");
1832
1833	mutex_lock(&trf->lock);
1834
1835	switch (trf->state) {
1836	case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1837	case TRF7970A_ST_WAIT_FOR_RX_DATA:
1838	case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1839	case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
1840		trf->aborting = true;
1841		break;
1842	case TRF7970A_ST_LISTENING:
1843		trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work);
1844		trf7970a_send_err_upstream(trf, -ECANCELED);
1845		dev_dbg(trf->dev, "Abort process complete\n");
1846		break;
1847	default:
1848		break;
1849	}
1850
1851	mutex_unlock(&trf->lock);
1852}
1853
1854static struct nfc_digital_ops trf7970a_nfc_ops = {
1855	.in_configure_hw	= trf7970a_in_configure_hw,
1856	.in_send_cmd		= trf7970a_send_cmd,
1857	.tg_configure_hw	= trf7970a_tg_configure_hw,
1858	.tg_send_cmd		= trf7970a_send_cmd,
1859	.tg_listen		= trf7970a_tg_listen,
1860	.tg_listen_md		= trf7970a_tg_listen_md,
1861	.tg_get_rf_tech		= trf7970a_tg_get_rf_tech,
1862	.switch_rf		= trf7970a_switch_rf,
1863	.abort_cmd		= trf7970a_abort_cmd,
1864};
1865
1866static int trf7970a_power_up(struct trf7970a *trf)
1867{
1868	int ret;
1869
1870	dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state);
1871
1872	if (trf->state != TRF7970A_ST_PWR_OFF)
1873		return 0;
1874
1875	ret = regulator_enable(trf->regulator);
1876	if (ret) {
1877		dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret);
1878		return ret;
1879	}
1880
1881	usleep_range(5000, 6000);
1882
1883	if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) {
1884		gpio_set_value(trf->en2_gpio, 1);
 
1885		usleep_range(1000, 2000);
1886	}
1887
1888	gpio_set_value(trf->en_gpio, 1);
1889
1890	usleep_range(20000, 21000);
1891
1892	trf->state = TRF7970A_ST_RF_OFF;
1893
1894	return 0;
1895}
1896
1897static int trf7970a_power_down(struct trf7970a *trf)
1898{
1899	int ret;
1900
1901	dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state);
1902
1903	if (trf->state == TRF7970A_ST_PWR_OFF)
1904		return 0;
1905
1906	if (trf->state != TRF7970A_ST_RF_OFF) {
1907		dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n",
1908				trf->state);
1909		return -EBUSY;
1910	}
1911
1912	gpio_set_value(trf->en_gpio, 0);
1913	gpio_set_value(trf->en2_gpio, 0);
 
 
1914
1915	ret = regulator_disable(trf->regulator);
1916	if (ret)
1917		dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__,
1918				ret);
1919
1920	trf->state = TRF7970A_ST_PWR_OFF;
1921
1922	return ret;
1923}
1924
1925static int trf7970a_startup(struct trf7970a *trf)
1926{
1927	int ret;
1928
1929	ret = trf7970a_power_up(trf);
1930	if (ret)
1931		return ret;
1932
1933	pm_runtime_set_active(trf->dev);
1934	pm_runtime_enable(trf->dev);
1935	pm_runtime_mark_last_busy(trf->dev);
1936
1937	return 0;
1938}
1939
1940static void trf7970a_shutdown(struct trf7970a *trf)
1941{
1942	switch (trf->state) {
1943	case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1944	case TRF7970A_ST_WAIT_FOR_RX_DATA:
1945	case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1946	case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
1947	case TRF7970A_ST_LISTENING:
1948		trf7970a_send_err_upstream(trf, -ECANCELED);
1949		/* FALLTHROUGH */
1950	case TRF7970A_ST_IDLE:
1951	case TRF7970A_ST_IDLE_RX_BLOCKED:
1952		trf7970a_switch_rf_off(trf);
1953		break;
1954	default:
1955		break;
1956	}
1957
1958	pm_runtime_disable(trf->dev);
1959	pm_runtime_set_suspended(trf->dev);
1960
1961	trf7970a_power_down(trf);
1962}
1963
1964static int trf7970a_get_autosuspend_delay(struct device_node *np)
1965{
1966	int autosuspend_delay, ret;
1967
1968	ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay);
1969	if (ret)
1970		autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY;
1971
1972	return autosuspend_delay;
1973}
1974
1975static int trf7970a_get_vin_voltage_override(struct device_node *np,
1976		u32 *vin_uvolts)
1977{
1978	return of_property_read_u32(np, "vin-voltage-override", vin_uvolts);
1979}
1980
1981static int trf7970a_probe(struct spi_device *spi)
1982{
1983	struct device_node *np = spi->dev.of_node;
1984	struct trf7970a *trf;
1985	int uvolts, autosuspend_delay, ret;
 
1986
1987	if (!np) {
1988		dev_err(&spi->dev, "No Device Tree entry\n");
1989		return -EINVAL;
1990	}
1991
1992	trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL);
1993	if (!trf)
1994		return -ENOMEM;
1995
1996	trf->state = TRF7970A_ST_PWR_OFF;
1997	trf->dev = &spi->dev;
1998	trf->spi = spi;
1999
2000	spi->mode = SPI_MODE_1;
2001	spi->bits_per_word = 8;
2002
2003	ret = spi_setup(spi);
2004	if (ret < 0) {
2005		dev_err(trf->dev, "Can't set up SPI Communication\n");
2006		return ret;
2007	}
2008
2009	if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk"))
2010		trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE;
2011
2012	if (of_property_read_bool(np, "irq-status-read-quirk"))
2013		trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ;
2014
2015	/* There are two enable pins - both must be present */
2016	trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0);
2017	if (!gpio_is_valid(trf->en_gpio)) {
 
2018		dev_err(trf->dev, "No EN GPIO property\n");
2019		return trf->en_gpio;
2020	}
2021
2022	ret = devm_gpio_request_one(trf->dev, trf->en_gpio,
2023			GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN");
2024	if (ret) {
2025		dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret);
2026		return ret;
 
 
 
 
 
2027	}
2028
2029	trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1);
2030	if (!gpio_is_valid(trf->en2_gpio)) {
2031		dev_err(trf->dev, "No EN2 GPIO property\n");
2032		return trf->en2_gpio;
 
 
2033	}
2034
2035	ret = devm_gpio_request_one(trf->dev, trf->en2_gpio,
2036			GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2");
2037	if (ret) {
2038		dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret);
2039		return ret;
2040	}
2041
2042	if (of_property_read_bool(np, "en2-rf-quirk"))
2043		trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
2044
2045	ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
2046			trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
2047			"trf7970a", trf);
 
2048	if (ret) {
2049		dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
2050		return ret;
2051	}
2052
2053	mutex_init(&trf->lock);
2054	INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
2055
2056	trf->regulator = devm_regulator_get(&spi->dev, "vin");
2057	if (IS_ERR(trf->regulator)) {
2058		ret = PTR_ERR(trf->regulator);
2059		dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
2060		goto err_destroy_lock;
2061	}
2062
2063	ret = regulator_enable(trf->regulator);
2064	if (ret) {
2065		dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
2066		goto err_destroy_lock;
2067	}
2068
2069	ret = trf7970a_get_vin_voltage_override(np, &uvolts);
2070	if (ret)
2071		uvolts = regulator_get_voltage(trf->regulator);
2072
2073	if (uvolts > 4000000)
2074		trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;
2075
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2076	trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
2077			TRF7970A_SUPPORTED_PROTOCOLS,
2078			NFC_DIGITAL_DRV_CAPS_IN_CRC |
2079				NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 0);
 
2080	if (!trf->ddev) {
2081		dev_err(trf->dev, "Can't allocate NFC digital device\n");
2082		ret = -ENOMEM;
2083		goto err_disable_regulator;
2084	}
2085
2086	nfc_digital_set_parent_dev(trf->ddev, trf->dev);
2087	nfc_digital_set_drvdata(trf->ddev, trf);
2088	spi_set_drvdata(spi, trf);
2089
2090	autosuspend_delay = trf7970a_get_autosuspend_delay(np);
2091
2092	pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
2093	pm_runtime_use_autosuspend(trf->dev);
2094
2095	ret = trf7970a_startup(trf);
2096	if (ret)
2097		goto err_free_ddev;
2098
2099	ret = nfc_digital_register_device(trf->ddev);
2100	if (ret) {
2101		dev_err(trf->dev, "Can't register NFC digital device: %d\n",
2102				ret);
2103		goto err_shutdown;
2104	}
2105
2106	return 0;
2107
2108err_shutdown:
2109	trf7970a_shutdown(trf);
2110err_free_ddev:
2111	nfc_digital_free_device(trf->ddev);
2112err_disable_regulator:
2113	regulator_disable(trf->regulator);
 
 
2114err_destroy_lock:
2115	mutex_destroy(&trf->lock);
2116	return ret;
2117}
2118
2119static int trf7970a_remove(struct spi_device *spi)
2120{
2121	struct trf7970a *trf = spi_get_drvdata(spi);
2122
2123	mutex_lock(&trf->lock);
2124
2125	trf7970a_shutdown(trf);
2126
2127	mutex_unlock(&trf->lock);
2128
2129	nfc_digital_unregister_device(trf->ddev);
2130	nfc_digital_free_device(trf->ddev);
2131
2132	regulator_disable(trf->regulator);
 
2133
2134	mutex_destroy(&trf->lock);
2135
2136	return 0;
2137}
2138
2139#ifdef CONFIG_PM_SLEEP
2140static int trf7970a_suspend(struct device *dev)
2141{
2142	struct spi_device *spi = to_spi_device(dev);
2143	struct trf7970a *trf = spi_get_drvdata(spi);
2144
2145	dev_dbg(dev, "Suspend\n");
2146
2147	mutex_lock(&trf->lock);
2148
2149	trf7970a_shutdown(trf);
2150
2151	mutex_unlock(&trf->lock);
2152
2153	return 0;
2154}
2155
2156static int trf7970a_resume(struct device *dev)
2157{
2158	struct spi_device *spi = to_spi_device(dev);
2159	struct trf7970a *trf = spi_get_drvdata(spi);
2160	int ret;
2161
2162	dev_dbg(dev, "Resume\n");
2163
2164	mutex_lock(&trf->lock);
2165
2166	ret = trf7970a_startup(trf);
2167
2168	mutex_unlock(&trf->lock);
2169
2170	return ret;
2171}
2172#endif
2173
2174#ifdef CONFIG_PM
2175static int trf7970a_pm_runtime_suspend(struct device *dev)
2176{
2177	struct spi_device *spi = to_spi_device(dev);
2178	struct trf7970a *trf = spi_get_drvdata(spi);
2179	int ret;
2180
2181	dev_dbg(dev, "Runtime suspend\n");
2182
2183	mutex_lock(&trf->lock);
2184
2185	ret = trf7970a_power_down(trf);
2186
2187	mutex_unlock(&trf->lock);
2188
2189	return ret;
2190}
2191
2192static int trf7970a_pm_runtime_resume(struct device *dev)
2193{
2194	struct spi_device *spi = to_spi_device(dev);
2195	struct trf7970a *trf = spi_get_drvdata(spi);
2196	int ret;
2197
2198	dev_dbg(dev, "Runtime resume\n");
2199
2200	ret = trf7970a_power_up(trf);
2201	if (!ret)
2202		pm_runtime_mark_last_busy(dev);
2203
2204	return ret;
2205}
2206#endif
2207
2208static const struct dev_pm_ops trf7970a_pm_ops = {
2209	SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
2210	SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
2211			trf7970a_pm_runtime_resume, NULL)
2212};
2213
2214static const struct of_device_id trf7970a_of_match[] = {
2215	{ .compatible = "ti,trf7970a", },
2216	{ /* sentinel */ },
2217};
 
2218MODULE_DEVICE_TABLE(of, trf7970a_of_match);
2219
2220static const struct spi_device_id trf7970a_id_table[] = {
2221	{ "trf7970a", 0 },
2222	{ }
2223};
 
2224MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
2225
2226static struct spi_driver trf7970a_spi_driver = {
2227	.probe		= trf7970a_probe,
2228	.remove		= trf7970a_remove,
2229	.id_table	= trf7970a_id_table,
2230	.driver		= {
2231		.name	= "trf7970a",
2232		.of_match_table = of_match_ptr(trf7970a_of_match),
2233		.pm	= &trf7970a_pm_ops,
2234	},
2235};
2236
2237module_spi_driver(trf7970a_spi_driver);
2238
2239MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
2240MODULE_LICENSE("GPL v2");
2241MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");