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Mark A. Greer165063f2014-03-10 11:56:22 -07001/*
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>
Mark A. Greere6403b72014-03-25 08:54:38 -070019#include <linux/pm_runtime.h>
Mark A. Greer165063f2014-03-10 11:56:22 -070020#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
Mark A. Greer95064bd2014-08-07 17:41:45 -070039 * 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.
Mark A. Greer165063f2014-03-10 11:56:22 -070046 *
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
Mark A. Greer13b42722014-09-02 15:12:45 -070065 * support that. So, if an abort is received before trf7970a_send_cmd()
Mark A. Greer165063f2014-03-10 11:56:22 -070066 * 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
Mark A. Greer5fa3af32014-03-25 08:54:29 -070077 * 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
Mark A. Greer165063f2014-03-10 11:56:22 -070079 * 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
Mark A. Greer5fa3af32014-03-25 08:54:29 -070083 * been received and there isn't an error). The delay is 20 ms since delays
84 * of ~16 ms have been observed during testing.
Mark A. Greer165063f2014-03-10 11:56:22 -070085 *
Mark A. Greer38b4eb12014-09-02 15:12:25 -070086 * 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 *
Mark A. Greer165063f2014-03-10 11:56:22 -070093 * 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.
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700102 *
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
Mark A. Greer38b4eb12014-09-02 15:12:25 -0700115 * 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
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700118 * reliably.
Mark A. Greer165063f2014-03-10 11:56:22 -0700119 */
120
Mark A. Greer80062892014-03-10 11:56:23 -0700121#define TRF7970A_SUPPORTED_PROTOCOLS \
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700122 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \
Mark A. Greer6857bb92014-04-14 10:04:10 -0700123 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \
Mark A. Greer13b42722014-09-02 15:12:45 -0700124 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK)
Mark A. Greer165063f2014-03-10 11:56:22 -0700125
Mark A. Greere6403b72014-03-25 08:54:38 -0700126#define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */
127
Mark A. Greer165063f2014-03-10 11:56:22 -0700128#define TRF7970A_RX_SKB_ALLOC_SIZE 256
129
Mark A. Greer1568bfe2014-09-02 15:12:20 -0700130#define TRF7970A_FIFO_SIZE 127
Mark A. Greer165063f2014-03-10 11:56:22 -0700131
132/* TX length is 3 nibbles long ==> 4KB - 1 bytes max */
133#define TRF7970A_TX_MAX (4096 - 1)
134
Mark A. Greer19618432014-09-02 15:12:44 -0700135#define TRF7970A_WAIT_FOR_TX_IRQ 20
Mark A. Greer5fa3af32014-03-25 08:54:29 -0700136#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20
Mark A. Greer38b4eb12014-09-02 15:12:25 -0700137#define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20
138#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40
Mark A. Greer165063f2014-03-10 11:56:22 -0700139
Mark A. Greer4e64eff2014-09-02 15:12:24 -0700140/* 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
Mark A. Greer165063f2014-03-10 11:56:22 -0700146/* 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 */
Mark A. Greer772079e2014-08-07 17:41:43 -0700150#define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0)
Mark A. Greer95064bd2014-08-07 17:41:45 -0700151#define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1)
Mark A. Greerab714812015-04-24 10:37:22 -0700152#define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2)
Mark A. Greer165063f2014-03-10 11:56:22 -0700153
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
Mark A. Greer851ee3c2014-09-02 15:12:42 -0700169#define TRF7970A_CMD_TEST_INT_RF 0x18
170#define TRF7970A_CMD_TEST_EXT_RF 0x19
Mark A. Greer165063f2014-03-10 11:56:22 -0700171#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
Mark A. Greer13b42722014-09-02 15:12:45 -0700244#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)
Mark A. Greer165063f2014-03-10 11:56:22 -0700253#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
Mark A. Greer13b42722014-09-02 15:12:45 -0700278#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
Mark A. Greer165063f2014-03-10 11:56:22 -0700294/* IRQ Status Register Bits */
295#define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */
Mark A. Greer13b42722014-09-02 15:12:45 -0700296#define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0)
Mark A. Greer165063f2014-03-10 11:56:22 -0700297#define TRF7970A_IRQ_STATUS_COL BIT(1)
298#define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2)
Mark A. Greer13b42722014-09-02 15:12:45 -0700299#define TRF7970A_IRQ_STATUS_NFC_RF BIT(2)
Mark A. Greer165063f2014-03-10 11:56:22 -0700300#define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3)
Mark A. Greer13b42722014-09-02 15:12:45 -0700301#define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3)
Mark A. Greer165063f2014-03-10 11:56:22 -0700302#define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4)
Mark A. Greer13b42722014-09-02 15:12:45 -0700303#define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4)
Mark A. Greer165063f2014-03-10 11:56:22 -0700304#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
Mark A. Greer851ee3c2014-09-02 15:12:42 -0700314#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
Mark A. Greer165063f2014-03-10 11:56:22 -0700318#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
Mark A. Greer13b42722014-09-02 15:12:45 -0700334#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
Mark A. Greercb174ab2014-09-02 15:12:46 -0700344#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
Mark A. Greer165063f2014-03-10 11:56:22 -0700377#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
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700382/* 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
Mark A. Greer165063f2014-03-10 11:56:22 -0700412enum trf7970a_state {
Mark A. Greerceccd6a2014-09-02 15:12:35 -0700413 TRF7970A_ST_PWR_OFF,
Mark A. Greerb5e17d92014-09-02 15:12:34 -0700414 TRF7970A_ST_RF_OFF,
Mark A. Greer165063f2014-03-10 11:56:22 -0700415 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,
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700420 TRF7970A_ST_WAIT_TO_ISSUE_EOF,
Mark A. Greer13b42722014-09-02 15:12:45 -0700421 TRF7970A_ST_LISTENING,
Mark A. Greercb174ab2014-09-02 15:12:46 -0700422 TRF7970A_ST_LISTENING_MD,
Mark A. Greer165063f2014-03-10 11:56:22 -0700423 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;
Mark A. Greer13b42722014-09-02 15:12:45 -0700433 bool is_initiator;
Mark A. Greer165063f2014-03-10 11:56:22 -0700434 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;
Mark A. Greerebcc5a02014-03-25 08:54:36 -0700439 u8 chip_status_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -0700440 u8 iso_ctrl;
Mark A. Greer49d19cc2014-03-25 08:54:33 -0700441 u8 iso_ctrl_tech;
Mark A. Greer12e9ade2014-03-25 08:54:35 -0700442 u8 modulator_sys_clk_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -0700443 u8 special_fcn_reg1;
Mark A. Greer4e64eff2014-09-02 15:12:24 -0700444 unsigned int guard_time;
Mark A. Greer165063f2014-03-10 11:56:22 -0700445 int technology;
446 int framing;
Mark A. Greercb174ab2014-09-02 15:12:46 -0700447 u8 md_rf_tech;
Mark A. Greer165063f2014-03-10 11:56:22 -0700448 u8 tx_cmd;
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700449 bool issue_eof;
Mark A. Greerab714812015-04-24 10:37:22 -0700450 bool adjust_resp_len;
Mark A. Greer165063f2014-03-10 11:56:22 -0700451 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
Mark A. Greer3e7f3352014-09-02 15:12:18 -0700489static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, size_t len)
Mark A. Greer165063f2014-03-10 11:56:22 -0700490{
491 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
Mark A. Greer3e7f3352014-09-02 15:12:18 -0700492 struct spi_transfer t[2];
493 struct spi_message m;
Mark A. Greer165063f2014-03-10 11:56:22 -0700494 int ret;
495
496 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
497
Mark A. Greer3e7f3352014-09-02 15:12:18 -0700498 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);
Mark A. Greer165063f2014-03-10 11:56:22 -0700511 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
Mark A. Greer772079e2014-08-07 17:41:43 -0700540 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) {
Mark A. Greer165063f2014-03-10 11:56:22 -0700541 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
Mark A. Greercb174ab2014-09-02 15:12:46 -0700556static 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
Mark A. Greer165063f2014-03-10 11:56:22 -0700608static void trf7970a_send_upstream(struct trf7970a *trf)
609{
Mark A. Greer165063f2014-03-10 11:56:22 -0700610 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
Mark A. Greer165063f2014-03-10 11:56:22 -0700618 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
Mark A. Greerab714812015-04-24 10:37:22 -0700631 if (trf->adjust_resp_len) {
632 skb_trim(trf->rx_skb, trf->rx_skb->len - 1);
633 trf->adjust_resp_len = false;
634 }
635
Mark A. Greer165063f2014-03-10 11:56:22 -0700636 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
637
638 trf->rx_skb = NULL;
639}
640
641static 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
Mark A. Greer6fb9edc2014-09-02 15:12:43 -0700645 cancel_delayed_work(&trf->timeout_work);
646
Mark A. Greer165063f2014-03-10 11:56:22 -0700647 kfree_skb(trf->rx_skb);
648 trf->rx_skb = ERR_PTR(errno);
649
650 trf7970a_send_upstream(trf);
651}
652
653static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700654 unsigned int len, u8 *prefix, unsigned int prefix_len)
Mark A. Greer165063f2014-03-10 11:56:22 -0700655{
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700656 struct spi_transfer t[2];
657 struct spi_message m;
Mark A. Greer165063f2014-03-10 11:56:22 -0700658 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
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700664 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);
Mark A. Greer165063f2014-03-10 11:56:22 -0700677 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 {
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700689 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;
Mark A. Greer19618432014-09-02 15:12:44 -0700694
695 if (!trf->timeout)
696 timeout = TRF7970A_WAIT_FOR_TX_IRQ;
697 else
698 timeout = trf->timeout;
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700699 }
Mark A. Greer165063f2014-03-10 11:56:22 -0700700 }
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
710static 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;
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700716 u8 prefix;
Mark A. Greer165063f2014-03-10 11:56:22 -0700717
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
Mark A. Greer4542e832014-09-02 15:12:19 -0700726 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
Mark A. Greer165063f2014-03-10 11:56:22 -0700727
728 /* Calculate how much more data can be written to the fifo */
729 len = TRF7970A_FIFO_SIZE - fifo_bytes;
Mark A. Greer0e840ed2014-09-02 15:12:29 -0700730 if (!len) {
731 schedule_delayed_work(&trf->timeout_work,
732 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
733 return;
734 }
735
Mark A. Greer165063f2014-03-10 11:56:22 -0700736 len = min(skb->len, len);
737
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700738 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER;
739
740 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix));
Mark A. Greer165063f2014-03-10 11:56:22 -0700741 if (ret)
742 trf7970a_send_err_upstream(trf, ret);
743}
744
745static 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
Mark A. Greer4542e832014-09-02 15:12:19 -0700764 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
765
Mark A. Greer165063f2014-03-10 11:56:22 -0700766 if (!fifo_bytes)
767 goto no_rx_data;
768
Mark A. Greer165063f2014-03-10 11:56:22 -0700769 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;
Mark A. Greer5d8f7592014-09-02 15:12:31 -0700798
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;
Mark A. Greer165063f2014-03-10 11:56:22 -0700813 }
814
815no_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
828static irqreturn_t trf7970a_irq(int irq, void *dev_id)
829{
830 struct trf7970a *trf = dev_id;
831 int ret;
Mark A. Greer13b42722014-09-02 15:12:45 -0700832 u8 status, fifo_bytes, iso_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -0700833
834 mutex_lock(&trf->lock);
835
Mark A. Greerb5e17d92014-09-02 15:12:34 -0700836 if (trf->state == TRF7970A_ST_RF_OFF) {
Mark A. Greer165063f2014-03-10 11:56:22 -0700837 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:
Mark A. Greer13b42722014-09-02 15:12:45 -0700858 /* 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.
Mark A. Greer165063f2014-03-10 11:56:22 -0700862 */
Mark A. Greer13b42722014-09-02 15:12:45 -0700863 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) {
Mark A. Greer165063f2014-03-10 11:56:22 -0700864 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);
Mark A. Greerbece3c52014-09-02 15:12:30 -0700885 } 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);
Mark A. Greer13b42722014-09-02 15:12:45 -0700895 } else if ((status == TRF7970A_IRQ_STATUS_TX) ||
896 (!trf->is_initiator &&
897 (status == (TRF7970A_IRQ_STATUS_TX |
898 TRF7970A_IRQ_STATUS_NFC_RF)))) {
Mark A. Greer4dd836e2014-03-25 08:54:32 -0700899 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
Mark A. Greer19618432014-09-02 15:12:44 -0700900
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 }
Mark A. Greer13b42722014-09-02 15:12:45 -0700908
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)
Mark A. Greerb9e30162014-09-23 11:25:47 -0700930 goto err_unlock_exit;
Mark A. Greer13b42722014-09-02 15:12:45 -0700931
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)
Mark A. Greerb9e30162014-09-23 11:25:47 -0700943 goto err_unlock_exit;
Mark A. Greer13b42722014-09-02 15:12:45 -0700944
945 trf->iso_ctrl = iso_ctrl;
946 }
Mark A. Greer4dd836e2014-03-25 08:54:32 -0700947 } else {
Mark A. Greer165063f2014-03-10 11:56:22 -0700948 trf7970a_send_err_upstream(trf, -EIO);
949 }
950 break;
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700951 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
952 if (status != TRF7970A_IRQ_STATUS_TX)
953 trf7970a_send_err_upstream(trf, -EIO);
954 break;
Mark A. Greer13b42722014-09-02 15:12:45 -0700955 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;
Mark A. Greercb174ab2014-09-02 15:12:46 -0700964 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;
Mark A. Greer165063f2014-03-10 11:56:22 -0700980 default:
981 dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
982 __func__, trf->state);
983 }
984
Mark A. Greerb9e30162014-09-23 11:25:47 -0700985err_unlock_exit:
Mark A. Greer165063f2014-03-10 11:56:22 -0700986 mutex_unlock(&trf->lock);
987 return IRQ_HANDLED;
988}
989
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700990static 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
Mark A. Greer165063f2014-03-10 11:56:22 -07001013static 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)
Mark A. Greerafa5b5f2014-09-02 15:12:32 -07001026 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001027 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
1028 trf7970a_issue_eof(trf);
Mark A. Greer165063f2014-03-10 11:56:22 -07001029 else
1030 trf7970a_send_err_upstream(trf, -ETIMEDOUT);
1031
1032 mutex_unlock(&trf->lock);
1033}
1034
1035static 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
Mark A. Greer4e007f82014-09-02 15:12:38 -07001049 usleep_range(1000, 2000);
1050
Mark A. Greer7149d6b2014-09-02 15:12:41 -07001051 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1052
Mark A. Greer6c08df42014-09-02 15:12:22 -07001053 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
Mark A. Greer165063f2014-03-10 11:56:22 -07001059 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
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001071 trf->iso_ctrl = 0xff;
Mark A. Greer165063f2014-03-10 11:56:22 -07001072 return 0;
1073
1074err_out:
1075 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
1076 return ret;
1077}
1078
1079static void trf7970a_switch_rf_off(struct trf7970a *trf)
1080{
Mark A. Greercfc708d2014-09-02 15:12:40 -07001081 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1082 (trf->state == TRF7970A_ST_RF_OFF))
1083 return;
1084
Mark A. Greer165063f2014-03-10 11:56:22 -07001085 dev_dbg(trf->dev, "Switching rf off\n");
1086
Mark A. Greera1d2dc52014-03-25 08:54:37 -07001087 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1088
1089 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl);
1090
Mark A. Greer165063f2014-03-10 11:56:22 -07001091 trf->aborting = false;
Mark A. Greerb5e17d92014-09-02 15:12:34 -07001092 trf->state = TRF7970A_ST_RF_OFF;
Mark A. Greere6403b72014-03-25 08:54:38 -07001093
1094 pm_runtime_mark_last_busy(trf->dev);
1095 pm_runtime_put_autosuspend(trf->dev);
Mark A. Greer165063f2014-03-10 11:56:22 -07001096}
1097
Mark A. Greer0a1de842014-09-02 15:12:33 -07001098static int trf7970a_switch_rf_on(struct trf7970a *trf)
Mark A. Greer165063f2014-03-10 11:56:22 -07001099{
Mark A. Greera08e5452014-09-02 15:12:23 -07001100 int ret;
1101
Mark A. Greer165063f2014-03-10 11:56:22 -07001102 dev_dbg(trf->dev, "Switching rf on\n");
1103
Mark A. Greere6403b72014-03-25 08:54:38 -07001104 pm_runtime_get_sync(trf->dev);
Mark A. Greer165063f2014-03-10 11:56:22 -07001105
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001106 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
Mark A. Greera08e5452014-09-02 15:12:23 -07001112 ret = trf7970a_init(trf);
1113 if (ret) {
1114 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001115 return ret;
Mark A. Greera08e5452014-09-02 15:12:23 -07001116 }
1117
Mark A. Greere6403b72014-03-25 08:54:38 -07001118 trf->state = TRF7970A_ST_IDLE;
Mark A. Greer0a1de842014-09-02 15:12:33 -07001119
1120 return 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001121}
1122
1123static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
1124{
1125 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001126 int ret = 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001127
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) {
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001134 case TRF7970A_ST_PWR_OFF:
Mark A. Greerb5e17d92014-09-02 15:12:34 -07001135 case TRF7970A_ST_RF_OFF:
Mark A. Greer0a1de842014-09-02 15:12:33 -07001136 ret = trf7970a_switch_rf_on(trf);
Mark A. Greer165063f2014-03-10 11:56:22 -07001137 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);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001145 ret = -EINVAL;
Mark A. Greer165063f2014-03-10 11:56:22 -07001146 }
1147 } else {
1148 switch (trf->state) {
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001149 case TRF7970A_ST_PWR_OFF:
Mark A. Greerb5e17d92014-09-02 15:12:34 -07001150 case TRF7970A_ST_RF_OFF:
Mark A. Greer165063f2014-03-10 11:56:22 -07001151 break;
1152 default:
1153 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1154 __func__, trf->state, on);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001155 ret = -EINVAL;
Mark A. Greer165063f2014-03-10 11:56:22 -07001156 /* FALLTHROUGH */
1157 case TRF7970A_ST_IDLE:
1158 case TRF7970A_ST_IDLE_RX_BLOCKED:
Mark A. Greer13b42722014-09-02 15:12:45 -07001159 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1160 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
Mark A. Greer165063f2014-03-10 11:56:22 -07001161 trf7970a_switch_rf_off(trf);
1162 }
1163 }
1164
1165 mutex_unlock(&trf->lock);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001166 return ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001167}
1168
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001169static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
Mark A. Greer165063f2014-03-10 11:56:22 -07001170{
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:
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001177 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
Mark A. Greer12e9ade2014-03-25 08:54:35 -07001178 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001179 trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
Mark A. Greer165063f2014-03-10 11:56:22 -07001180 break;
Mark A. Greer742b1f92014-03-31 17:52:33 -07001181 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;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001184 trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
Mark A. Greer742b1f92014-03-31 17:52:33 -07001185 break;
Mark A. Greer6857bb92014-04-14 10:04:10 -07001186 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;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001189 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
Mark A. Greer6857bb92014-04-14 10:04:10 -07001190 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;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001194 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
Mark A. Greer6857bb92014-04-14 10:04:10 -07001195 break;
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001196 case NFC_DIGITAL_RF_TECH_ISO15693:
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001197 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
Mark A. Greer12e9ade2014-03-25 08:54:35 -07001198 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001199 trf->guard_time = TRF7970A_GUARD_TIME_15693;
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001200 break;
Mark A. Greer165063f2014-03-10 11:56:22 -07001201 default:
1202 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1203 return -EINVAL;
1204 }
1205
1206 trf->technology = tech;
1207
Mark A. Greer13b42722014-09-02 15:12:45 -07001208 /* 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
Mark A. Greer165063f2014-03-10 11:56:22 -07001216 return ret;
1217}
1218
Mark A. Greer851ee3c2014-09-02 15:12:42 -07001219static 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
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001252static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)
Mark A. Greer165063f2014-03-10 11:56:22 -07001253{
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001254 u8 iso_ctrl = trf->iso_ctrl_tech;
Mark A. Greer851ee3c2014-09-02 15:12:42 -07001255 bool is_rf_field = false;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001256 int ret;
1257
Mark A. Greer165063f2014-03-10 11:56:22 -07001258 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;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001264 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
Mark A. Greer165063f2014-03-10 11:56:22 -07001265 break;
1266 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
Mark A. Greer80062892014-03-10 11:56:23 -07001267 case NFC_DIGITAL_FRAMING_NFCA_T4T:
Mark A. Greer742b1f92014-03-31 17:52:33 -07001268 case NFC_DIGITAL_FRAMING_NFCB:
1269 case NFC_DIGITAL_FRAMING_NFCB_T4T:
Mark A. Greer6857bb92014-04-14 10:04:10 -07001270 case NFC_DIGITAL_FRAMING_NFCF:
1271 case NFC_DIGITAL_FRAMING_NFCF_T3T:
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001272 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
1273 case NFC_DIGITAL_FRAMING_ISO15693_T5T:
Mark A. Greer13b42722014-09-02 15:12:45 -07001274 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1275 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
Mark A. Greer165063f2014-03-10 11:56:22 -07001276 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001277 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
Mark A. Greer165063f2014-03-10 11:56:22 -07001278 break;
1279 case NFC_DIGITAL_FRAMING_NFCA_T2T:
1280 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001281 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
Mark A. Greer165063f2014-03-10 11:56:22 -07001282 break;
1283 default:
1284 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1285 return -EINVAL;
1286 }
1287
1288 trf->framing = framing;
1289
Mark A. Greer851ee3c2014-09-02 15:12:42 -07001290 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
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001299 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;
Mark A. Greera0822a72014-03-25 08:54:34 -07001305
1306 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
Mark A. Greer12e9ade2014-03-25 08:54:35 -07001307 trf->modulator_sys_clk_ctrl);
Mark A. Greera0822a72014-03-25 08:54:34 -07001308 if (ret)
1309 return ret;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001310 }
1311
Mark A. Greera1d2dc52014-03-25 08:54:37 -07001312 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
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001321 usleep_range(trf->guard_time, trf->guard_time + 1000);
Mark A. Greera1d2dc52014-03-25 08:54:37 -07001322 }
1323
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001324 return 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001325}
1326
1327static 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);
Mark A. Greer18422e62014-03-25 08:54:39 -07001331 int ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001332
1333 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1334
1335 mutex_lock(&trf->lock);
1336
Mark A. Greer13b42722014-09-02 15:12:45 -07001337 trf->is_initiator = true;
1338
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001339 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1340 (trf->state == TRF7970A_ST_RF_OFF)) {
Mark A. Greer0a1de842014-09-02 15:12:33 -07001341 ret = trf7970a_switch_rf_on(trf);
1342 if (ret)
1343 goto err_unlock;
1344 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001345
1346 switch (type) {
1347 case NFC_DIGITAL_CONFIG_RF_TECH:
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001348 ret = trf7970a_in_config_rf_tech(trf, param);
Mark A. Greer165063f2014-03-10 11:56:22 -07001349 break;
1350 case NFC_DIGITAL_CONFIG_FRAMING:
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001351 ret = trf7970a_in_config_framing(trf, param);
Mark A. Greer165063f2014-03-10 11:56:22 -07001352 break;
1353 default:
1354 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1355 ret = -EINVAL;
1356 }
1357
Mark A. Greer0a1de842014-09-02 15:12:33 -07001358err_unlock:
Mark A. Greer165063f2014-03-10 11:56:22 -07001359 mutex_unlock(&trf->lock);
1360 return ret;
1361}
1362
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001363static 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
Mark A. Greer165063f2014-03-10 11:56:22 -07001380static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
1381{
1382 u8 *req = skb->data;
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001383 u8 special_fcn_reg1, iso_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -07001384 int ret;
1385
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001386 trf->issue_eof = false;
1387
Mark A. Greer165063f2014-03-10 11:56:22 -07001388 /* 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.
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001391 *
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.
Mark A. Greer165063f2014-03-10 11:56:22 -07001396 */
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 }
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001412 } 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
Mark A. Greerab714812015-04-24 10:37:22 -07001439 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 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001448 }
1449
1450 return 0;
1451}
1452
Mark A. Greer13b42722014-09-02 15:12:45 -07001453static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,
Mark A. Greer165063f2014-03-10 11:56:22 -07001454 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);
Mark A. Greer7a1e5552014-09-02 15:12:28 -07001458 u8 prefix[5];
Mark A. Greer165063f2014-03-10 11:56:22 -07001459 unsigned int len;
1460 int ret;
Mark A. Greeraff05642014-09-02 15:12:26 -07001461 u8 status;
Mark A. Greer165063f2014-03-10 11:56:22 -07001462
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
Mark A. Greer19618432014-09-02 15:12:44 -07001486 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 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001494 }
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
Mark A. Greer13b42722014-09-02 15:12:45 -07001504 if (trf->is_initiator) {
1505 ret = trf7970a_per_cmd_config(trf, skb);
1506 if (ret)
1507 goto out_err;
1508 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001509
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;
Mark A. Greer165063f2014-03-10 11:56:22 -07001518
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.
Mark A. Greer7a1e5552014-09-02 15:12:28 -07001522 * That totals 5 bytes.
Mark A. Greer165063f2014-03-10 11:56:22 -07001523 */
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
Mark A. Greeraff05642014-09-02 15:12:26 -07001541 /* Clear possible spurious interrupt */
1542 ret = trf7970a_read_irqstatus(trf, &status);
1543 if (ret)
1544 goto out_err;
1545
Mark A. Greer7a1e5552014-09-02 15:12:28 -07001546 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));
Mark A. Greer165063f2014-03-10 11:56:22 -07001547 if (ret) {
1548 kfree_skb(trf->rx_skb);
1549 trf->rx_skb = NULL;
1550 }
1551
1552out_err:
1553 mutex_unlock(&trf->lock);
1554 return ret;
1555}
1556
Mark A. Greer13b42722014-09-02 15:12:45 -07001557static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)
Mark A. Greer165063f2014-03-10 11:56:22 -07001558{
Mark A. Greer13b42722014-09-02 15:12:45 -07001559 int ret = 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001560
Mark A. Greer13b42722014-09-02 15:12:45 -07001561 dev_dbg(trf->dev, "rf technology: %d\n", tech);
Mark A. Greer165063f2014-03-10 11:56:22 -07001562
Mark A. Greer13b42722014-09-02 15:12:45 -07001563 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;
Mark A. Greer165063f2014-03-10 11:56:22 -07001603}
1604
Mark A. Greer13b42722014-09-02 15:12:45 -07001605/* 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 */
1611static 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
1670static 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
1701err_unlock:
1702 mutex_unlock(&trf->lock);
1703 return ret;
1704}
1705
Mark A. Greercb174ab2014-09-02 15:12:46 -07001706static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1707 nfc_digital_cmd_complete_t cb, void *arg, bool mode_detect)
Mark A. Greer165063f2014-03-10 11:56:22 -07001708{
1709 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
Mark A. Greer13b42722014-09-02 15:12:45 -07001710 int ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001711
Mark A. Greer13b42722014-09-02 15:12:45 -07001712 mutex_lock(&trf->lock);
Mark A. Greer165063f2014-03-10 11:56:22 -07001713
Mark A. Greer13b42722014-09-02 15:12:45 -07001714 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 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001721
Mark A. Greer13b42722014-09-02 15:12:45 -07001722 if (trf->aborting) {
1723 dev_dbg(trf->dev, "Abort process complete\n");
1724 trf->aborting = false;
1725 ret = -ECANCELED;
1726 goto out_err;
1727 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001728
Mark A. Greer13b42722014-09-02 15:12:45 -07001729 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)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001743 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001744
1745 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
1746 TRF7970A_REG_IO_CTRL_VRS(0x1));
1747 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001748 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001749
1750 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL,
1751 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3));
1752 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001753 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001754
1755 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL,
1756 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7));
1757 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001758 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001759
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
Mark A. Greercb174ab2014-09-02 15:12:46 -07001770 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD :
1771 TRF7970A_ST_LISTENING;
Mark A. Greer13b42722014-09-02 15:12:45 -07001772
1773 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
1774
1775out_err:
1776 mutex_unlock(&trf->lock);
1777 return ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001778}
1779
Mark A. Greercb174ab2014-09-02 15:12:46 -07001780static 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
1791static 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
1813static 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
Mark A. Greer165063f2014-03-10 11:56:22 -07001825static 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);
Mark A. Greer5876bc72014-03-25 08:54:30 -07001832
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;
Mark A. Greer13b42722014-09-02 15:12:45 -07001840 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;
Mark A. Greer5876bc72014-03-25 08:54:30 -07001845 default:
1846 break;
1847 }
1848
Mark A. Greer165063f2014-03-10 11:56:22 -07001849 mutex_unlock(&trf->lock);
1850}
1851
1852static struct nfc_digital_ops trf7970a_nfc_ops = {
1853 .in_configure_hw = trf7970a_in_configure_hw,
Mark A. Greer13b42722014-09-02 15:12:45 -07001854 .in_send_cmd = trf7970a_send_cmd,
Mark A. Greer165063f2014-03-10 11:56:22 -07001855 .tg_configure_hw = trf7970a_tg_configure_hw,
Mark A. Greer13b42722014-09-02 15:12:45 -07001856 .tg_send_cmd = trf7970a_send_cmd,
Mark A. Greer165063f2014-03-10 11:56:22 -07001857 .tg_listen = trf7970a_tg_listen,
Mark A. Greercb174ab2014-09-02 15:12:46 -07001858 .tg_listen_md = trf7970a_tg_listen_md,
1859 .tg_get_rf_tech = trf7970a_tg_get_rf_tech,
Mark A. Greer165063f2014-03-10 11:56:22 -07001860 .switch_rf = trf7970a_switch_rf,
1861 .abort_cmd = trf7970a_abort_cmd,
1862};
1863
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001864static 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
1895static 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
Mark A. Greerb5282812014-09-02 15:12:36 -07001923static 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
1938static 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:
Mark A. Greer13b42722014-09-02 15:12:45 -07001945 case TRF7970A_ST_LISTENING:
Mark A. Greerb5282812014-09-02 15:12:36 -07001946 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
Mark A. Greerfd0c8282014-03-25 08:54:40 -07001962static 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
Mark A. Greerfd0c8282014-03-25 08:54:40 -07001970 return autosuspend_delay;
1971}
1972
Mark A. Greer3bd14232014-08-07 17:41:41 -07001973static 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
Mark A. Greer165063f2014-03-10 11:56:22 -07001979static int trf7970a_probe(struct spi_device *spi)
1980{
1981 struct device_node *np = spi->dev.of_node;
Mark A. Greer165063f2014-03-10 11:56:22 -07001982 struct trf7970a *trf;
Mark A. Greerfd0c8282014-03-25 08:54:40 -07001983 int uvolts, autosuspend_delay, ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001984
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
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001994 trf->state = TRF7970A_ST_PWR_OFF;
Mark A. Greer165063f2014-03-10 11:56:22 -07001995 trf->dev = &spi->dev;
1996 trf->spi = spi;
Mark A. Greer165063f2014-03-10 11:56:22 -07001997
1998 spi->mode = SPI_MODE_1;
1999 spi->bits_per_word = 8;
2000
Mark A. Greer24707292014-09-02 15:12:17 -07002001 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
Mark A. Greerab714812015-04-24 10:37:22 -07002007 if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk"))
2008 trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE;
2009
Mark A. Greer772079e2014-08-07 17:41:43 -07002010 if (of_property_read_bool(np, "irq-status-read-quirk"))
2011 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ;
2012
Mark A. Greer165063f2014-03-10 11:56:22 -07002013 /* 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,
Mark A. Greerf23b7352014-08-07 17:41:47 -07002021 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN");
Mark A. Greer165063f2014-03-10 11:56:22 -07002022 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,
Mark A. Greerf23b7352014-08-07 17:41:47 -07002034 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2");
Mark A. Greer165063f2014-03-10 11:56:22 -07002035 if (ret) {
2036 dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret);
2037 return ret;
2038 }
2039
Mark A. Greer95064bd2014-08-07 17:41:45 -07002040 if (of_property_read_bool(np, "en2-rf-quirk"))
2041 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
2042
Mark A. Greer165063f2014-03-10 11:56:22 -07002043 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
Mark A. Greer3bd14232014-08-07 17:41:41 -07002067 ret = trf7970a_get_vin_voltage_override(np, &uvolts);
2068 if (ret)
2069 uvolts = regulator_get_voltage(trf->regulator);
Mark A. Greerebcc5a02014-03-25 08:54:36 -07002070
2071 if (uvolts > 4000000)
2072 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;
2073
Mark A. Greer165063f2014-03-10 11:56:22 -07002074 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
2075 TRF7970A_SUPPORTED_PROTOCOLS,
Mark A. Greer13b42722014-09-02 15:12:45 -07002076 NFC_DIGITAL_DRV_CAPS_IN_CRC |
2077 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 0);
Mark A. Greer165063f2014-03-10 11:56:22 -07002078 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
Mark A. Greerfd0c8282014-03-25 08:54:40 -07002088 autosuspend_delay = trf7970a_get_autosuspend_delay(np);
2089
2090 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
Mark A. Greere6403b72014-03-25 08:54:38 -07002091 pm_runtime_use_autosuspend(trf->dev);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002092
Mark A. Greerb5282812014-09-02 15:12:36 -07002093 ret = trf7970a_startup(trf);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002094 if (ret)
2095 goto err_free_ddev;
2096
Mark A. Greer165063f2014-03-10 11:56:22 -07002097 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);
Mark A. Greerb5282812014-09-02 15:12:36 -07002101 goto err_shutdown;
Mark A. Greer165063f2014-03-10 11:56:22 -07002102 }
2103
2104 return 0;
2105
Mark A. Greerb5282812014-09-02 15:12:36 -07002106err_shutdown:
2107 trf7970a_shutdown(trf);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002108err_free_ddev:
Mark A. Greer165063f2014-03-10 11:56:22 -07002109 nfc_digital_free_device(trf->ddev);
2110err_disable_regulator:
2111 regulator_disable(trf->regulator);
2112err_destroy_lock:
2113 mutex_destroy(&trf->lock);
2114 return ret;
2115}
2116
2117static int trf7970a_remove(struct spi_device *spi)
2118{
2119 struct trf7970a *trf = spi_get_drvdata(spi);
2120
2121 mutex_lock(&trf->lock);
2122
Mark A. Greerb5282812014-09-02 15:12:36 -07002123 trf7970a_shutdown(trf);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002124
2125 mutex_unlock(&trf->lock);
Mark A. Greere6403b72014-03-25 08:54:38 -07002126
Mark A. Greer165063f2014-03-10 11:56:22 -07002127 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
Mark A. Greer77c95392014-09-02 15:12:37 -07002137#ifdef CONFIG_PM_SLEEP
2138static 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);
Mark A. Greer77c95392014-09-02 15:12:37 -07002142
2143 dev_dbg(dev, "Suspend\n");
2144
2145 mutex_lock(&trf->lock);
2146
2147 trf7970a_shutdown(trf);
2148
2149 mutex_unlock(&trf->lock);
2150
Mark A. Greer671970f2014-09-23 11:25:45 -07002151 return 0;
Mark A. Greer77c95392014-09-02 15:12:37 -07002152}
2153
2154static 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);
Mark A. Greer55ef2e72014-09-23 11:25:46 -07002158 int ret;
Mark A. Greer77c95392014-09-02 15:12:37 -07002159
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
Rafael J. Wysockie8a92352014-12-14 23:14:36 +01002172#ifdef CONFIG_PM
Mark A. Greere6403b72014-03-25 08:54:38 -07002173static 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
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002181 mutex_lock(&trf->lock);
Mark A. Greere6403b72014-03-25 08:54:38 -07002182
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002183 ret = trf7970a_power_down(trf);
Mark A. Greere6403b72014-03-25 08:54:38 -07002184
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002185 mutex_unlock(&trf->lock);
Mark A. Greere6403b72014-03-25 08:54:38 -07002186
2187 return ret;
2188}
2189
2190static 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
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002198 ret = trf7970a_power_up(trf);
2199 if (!ret)
2200 pm_runtime_mark_last_busy(dev);
Mark A. Greere6403b72014-03-25 08:54:38 -07002201
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002202 return ret;
Mark A. Greere6403b72014-03-25 08:54:38 -07002203}
2204#endif
2205
2206static const struct dev_pm_ops trf7970a_pm_ops = {
Mark A. Greer77c95392014-09-02 15:12:37 -07002207 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
Mark A. Greere6403b72014-03-25 08:54:38 -07002208 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
2209 trf7970a_pm_runtime_resume, NULL)
2210};
2211
Mark A. Greer165063f2014-03-10 11:56:22 -07002212static const struct spi_device_id trf7970a_id_table[] = {
Mark A. Greer772079e2014-08-07 17:41:43 -07002213 { "trf7970a", 0 },
Mark A. Greer165063f2014-03-10 11:56:22 -07002214 { }
2215};
2216MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
2217
2218static 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,
Mark A. Greere6403b72014-03-25 08:54:38 -07002225 .pm = &trf7970a_pm_ops,
Mark A. Greer165063f2014-03-10 11:56:22 -07002226 },
2227};
2228
2229module_spi_driver(trf7970a_spi_driver);
2230
2231MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
2232MODULE_LICENSE("GPL v2");
2233MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");