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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 */
Geoff Lansberry837eb4d2016-12-21 23:18:32 -0500127#define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000
128#define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000
129
Mark A. Greere6403b72014-03-25 08:54:38 -0700130
Mark A. Greer165063f2014-03-10 11:56:22 -0700131#define TRF7970A_RX_SKB_ALLOC_SIZE 256
132
Mark A. Greer1568bfe2014-09-02 15:12:20 -0700133#define TRF7970A_FIFO_SIZE 127
Mark A. Greer165063f2014-03-10 11:56:22 -0700134
135/* TX length is 3 nibbles long ==> 4KB - 1 bytes max */
136#define TRF7970A_TX_MAX (4096 - 1)
137
Mark A. Greer19618432014-09-02 15:12:44 -0700138#define TRF7970A_WAIT_FOR_TX_IRQ 20
Mark A. Greer5fa3af32014-03-25 08:54:29 -0700139#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20
Mark A. Greer38b4eb12014-09-02 15:12:25 -0700140#define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20
141#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40
Mark A. Greer165063f2014-03-10 11:56:22 -0700142
Mark A. Greer4e64eff2014-09-02 15:12:24 -0700143/* Guard times for various RF technologies (in us) */
144#define TRF7970A_GUARD_TIME_NFCA 5000
145#define TRF7970A_GUARD_TIME_NFCB 5000
146#define TRF7970A_GUARD_TIME_NFCF 20000
147#define TRF7970A_GUARD_TIME_15693 1000
148
Mark A. Greer165063f2014-03-10 11:56:22 -0700149/* Quirks */
150/* Erratum: When reading IRQ Status register on trf7970a, we must issue a
151 * read continuous command for IRQ Status and Collision Position registers.
152 */
Mark A. Greer772079e2014-08-07 17:41:43 -0700153#define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0)
Mark A. Greer95064bd2014-08-07 17:41:45 -0700154#define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1)
Mark A. Greerab714812015-04-24 10:37:22 -0700155#define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2)
Mark A. Greer165063f2014-03-10 11:56:22 -0700156
157/* Direct commands */
158#define TRF7970A_CMD_IDLE 0x00
159#define TRF7970A_CMD_SOFT_INIT 0x03
160#define TRF7970A_CMD_RF_COLLISION 0x04
161#define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05
162#define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06
163#define TRF7970A_CMD_FIFO_RESET 0x0f
164#define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10
165#define TRF7970A_CMD_TRANSMIT 0x11
166#define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12
167#define TRF7970A_CMD_DELAY_TRANSMIT 0x13
168#define TRF7970A_CMD_EOF 0x14
169#define TRF7970A_CMD_CLOSE_SLOT 0x15
170#define TRF7970A_CMD_BLOCK_RX 0x16
171#define TRF7970A_CMD_ENABLE_RX 0x17
Mark A. Greer851ee3c2014-09-02 15:12:42 -0700172#define TRF7970A_CMD_TEST_INT_RF 0x18
173#define TRF7970A_CMD_TEST_EXT_RF 0x19
Mark A. Greer165063f2014-03-10 11:56:22 -0700174#define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a
175
176/* Bits determining whether its a direct command or register R/W,
177 * whether to use a continuous SPI transaction or not, and the actual
178 * direct cmd opcode or regster address.
179 */
180#define TRF7970A_CMD_BIT_CTRL BIT(7)
181#define TRF7970A_CMD_BIT_RW BIT(6)
182#define TRF7970A_CMD_BIT_CONTINUOUS BIT(5)
183#define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f)
184
185/* Registers addresses */
186#define TRF7970A_CHIP_STATUS_CTRL 0x00
187#define TRF7970A_ISO_CTRL 0x01
188#define TRF7970A_ISO14443B_TX_OPTIONS 0x02
189#define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03
190#define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04
191#define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05
192#define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06
193#define TRF7970A_RX_NO_RESPONSE_WAIT 0x07
194#define TRF7970A_RX_WAIT_TIME 0x08
195#define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09
196#define TRF7970A_RX_SPECIAL_SETTINGS 0x0a
197#define TRF7970A_REG_IO_CTRL 0x0b
198#define TRF7970A_IRQ_STATUS 0x0c
199#define TRF7970A_COLLISION_IRQ_MASK 0x0d
200#define TRF7970A_COLLISION_POSITION 0x0e
201#define TRF7970A_RSSI_OSC_STATUS 0x0f
202#define TRF7970A_SPECIAL_FCN_REG1 0x10
203#define TRF7970A_SPECIAL_FCN_REG2 0x11
204#define TRF7970A_RAM1 0x12
205#define TRF7970A_RAM2 0x13
206#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14
207#define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16
208#define TRF7970A_NFCID1 0x17
209#define TRF7970A_NFC_TARGET_LEVEL 0x18
210#define TRF79070A_NFC_TARGET_PROTOCOL 0x19
211#define TRF7970A_TEST_REGISTER1 0x1a
212#define TRF7970A_TEST_REGISTER2 0x1b
213#define TRF7970A_FIFO_STATUS 0x1c
214#define TRF7970A_TX_LENGTH_BYTE1 0x1d
215#define TRF7970A_TX_LENGTH_BYTE2 0x1e
216#define TRF7970A_FIFO_IO_REGISTER 0x1f
217
218/* Chip Status Control Register Bits */
219#define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0)
220#define TRF7970A_CHIP_STATUS_REC_ON BIT(1)
221#define TRF7970A_CHIP_STATUS_AGC_ON BIT(2)
222#define TRF7970A_CHIP_STATUS_PM_ON BIT(3)
223#define TRF7970A_CHIP_STATUS_RF_PWR BIT(4)
224#define TRF7970A_CHIP_STATUS_RF_ON BIT(5)
225#define TRF7970A_CHIP_STATUS_DIRECT BIT(6)
226#define TRF7970A_CHIP_STATUS_STBY BIT(7)
227
228/* ISO Control Register Bits */
229#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00
230#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01
231#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02
232#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03
233#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04
234#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05
235#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06
236#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07
237#define TRF7970A_ISO_CTRL_14443A_106 0x08
238#define TRF7970A_ISO_CTRL_14443A_212 0x09
239#define TRF7970A_ISO_CTRL_14443A_424 0x0a
240#define TRF7970A_ISO_CTRL_14443A_848 0x0b
241#define TRF7970A_ISO_CTRL_14443B_106 0x0c
242#define TRF7970A_ISO_CTRL_14443B_212 0x0d
243#define TRF7970A_ISO_CTRL_14443B_424 0x0e
244#define TRF7970A_ISO_CTRL_14443B_848 0x0f
245#define TRF7970A_ISO_CTRL_FELICA_212 0x1a
246#define TRF7970A_ISO_CTRL_FELICA_424 0x1b
Mark A. Greer13b42722014-09-02 15:12:45 -0700247#define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01
248#define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02
249#define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03
250#define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00
251#define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01
252#define TRF7970A_ISO_CTRL_NFC_CE BIT(2)
253#define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3)
254#define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4)
255#define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5)
Mark A. Greer165063f2014-03-10 11:56:22 -0700256#define TRF7970A_ISO_CTRL_RFID BIT(5)
257#define TRF7970A_ISO_CTRL_DIR_MODE BIT(6)
258#define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */
259
260#define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f
261
262/* Modulator and SYS_CLK Control Register Bits */
263#define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7)
264#define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0))
265#define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1))
266#define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2))
267#define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3))
268#define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4))
269#define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5))
270#define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6))
271#define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7))
272#define TRF7970A_MODULATOR_EN_ANA BIT(3)
273#define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4)
274#define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0))
275#define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1))
276#define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2))
277#define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3))
278#define TRF7970A_MODULATOR_EN_OOK BIT(6)
279#define TRF7970A_MODULATOR_27MHZ BIT(7)
280
Mark A. Greer13b42722014-09-02 15:12:45 -0700281#define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0)
282#define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1)
283#define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2)
284#define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2)
285#define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2)
286#define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2)
287#define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4)
288#define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5)
289#define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6)
290#define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7)
291
292#define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07)
293#define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5)
294#define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6)
295#define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7)
296
Mark A. Greer165063f2014-03-10 11:56:22 -0700297/* IRQ Status Register Bits */
298#define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */
Mark A. Greer13b42722014-09-02 15:12:45 -0700299#define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0)
Mark A. Greer165063f2014-03-10 11:56:22 -0700300#define TRF7970A_IRQ_STATUS_COL BIT(1)
301#define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2)
Mark A. Greer13b42722014-09-02 15:12:45 -0700302#define TRF7970A_IRQ_STATUS_NFC_RF BIT(2)
Mark A. Greer165063f2014-03-10 11:56:22 -0700303#define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3)
Mark A. Greer13b42722014-09-02 15:12:45 -0700304#define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3)
Mark A. Greer165063f2014-03-10 11:56:22 -0700305#define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4)
Mark A. Greer13b42722014-09-02 15:12:45 -0700306#define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4)
Mark A. Greer165063f2014-03-10 11:56:22 -0700307#define TRF7970A_IRQ_STATUS_FIFO BIT(5)
308#define TRF7970A_IRQ_STATUS_SRX BIT(6)
309#define TRF7970A_IRQ_STATUS_TX BIT(7)
310
311#define TRF7970A_IRQ_STATUS_ERROR \
312 (TRF7970A_IRQ_STATUS_COL | \
313 TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \
314 TRF7970A_IRQ_STATUS_PARITY_ERROR | \
315 TRF7970A_IRQ_STATUS_CRC_ERROR)
316
Mark A. Greer851ee3c2014-09-02 15:12:42 -0700317#define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0))
318#define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3))
319#define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6)
320
Mark A. Greer165063f2014-03-10 11:56:22 -0700321#define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0)
322#define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1)
323#define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2)
324#define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3)
325#define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4)
326#define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5)
327
328#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2)
329#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2)
330#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2)
331#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2)
332#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0
333#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1
334#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2
335#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3
336
Mark A. Greer13b42722014-09-02 15:12:45 -0700337#define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07)
338#define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7)
339
340#define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07)
341#define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3)
Mark Greerae291f72015-08-19 08:57:58 -0700342#define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5)
Mark A. Greer13b42722014-09-02 15:12:45 -0700343#define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6)
344#define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6)
345#define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6)
346
Mark A. Greercb174ab2014-09-02 15:12:46 -0700347#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0)
348#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1)
349#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1))
350#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2)
351#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3)
352#define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4)
353#define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6)
354#define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7)
355
356#define TRF79070A_NFC_TARGET_PROTOCOL_106A \
357 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
358 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
359 TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \
360 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
361
362#define TRF79070A_NFC_TARGET_PROTOCOL_106B \
363 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
364 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
365 TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \
366 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
367
368#define TRF79070A_NFC_TARGET_PROTOCOL_212F \
369 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
370 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
371 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
372 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212)
373
374#define TRF79070A_NFC_TARGET_PROTOCOL_424F \
375 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
376 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
377 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
378 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424)
379
Mark A. Greer165063f2014-03-10 11:56:22 -0700380#define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7)
381
382/* NFC (ISO/IEC 14443A) Type 2 Tag commands */
383#define NFC_T2T_CMD_READ 0x30
384
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700385/* ISO 15693 commands codes */
386#define ISO15693_CMD_INVENTORY 0x01
387#define ISO15693_CMD_READ_SINGLE_BLOCK 0x20
388#define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21
389#define ISO15693_CMD_LOCK_BLOCK 0x22
390#define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23
391#define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24
392#define ISO15693_CMD_SELECT 0x25
393#define ISO15693_CMD_RESET_TO_READY 0x26
394#define ISO15693_CMD_WRITE_AFI 0x27
395#define ISO15693_CMD_LOCK_AFI 0x28
396#define ISO15693_CMD_WRITE_DSFID 0x29
397#define ISO15693_CMD_LOCK_DSFID 0x2a
398#define ISO15693_CMD_GET_SYSTEM_INFO 0x2b
399#define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c
400
401/* ISO 15693 request and response flags */
402#define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0)
403#define ISO15693_REQ_FLAG_DATA_RATE BIT(1)
404#define ISO15693_REQ_FLAG_INVENTORY BIT(2)
405#define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3)
406#define ISO15693_REQ_FLAG_SELECT BIT(4)
407#define ISO15693_REQ_FLAG_AFI BIT(4)
408#define ISO15693_REQ_FLAG_ADDRESS BIT(5)
409#define ISO15693_REQ_FLAG_NB_SLOTS BIT(5)
410#define ISO15693_REQ_FLAG_OPTION BIT(6)
411
412#define ISO15693_REQ_FLAG_SPEED_MASK \
413 (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE)
414
Mark A. Greer165063f2014-03-10 11:56:22 -0700415enum trf7970a_state {
Mark A. Greerceccd6a2014-09-02 15:12:35 -0700416 TRF7970A_ST_PWR_OFF,
Mark A. Greerb5e17d92014-09-02 15:12:34 -0700417 TRF7970A_ST_RF_OFF,
Mark A. Greer165063f2014-03-10 11:56:22 -0700418 TRF7970A_ST_IDLE,
419 TRF7970A_ST_IDLE_RX_BLOCKED,
420 TRF7970A_ST_WAIT_FOR_TX_FIFO,
421 TRF7970A_ST_WAIT_FOR_RX_DATA,
422 TRF7970A_ST_WAIT_FOR_RX_DATA_CONT,
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700423 TRF7970A_ST_WAIT_TO_ISSUE_EOF,
Mark A. Greer13b42722014-09-02 15:12:45 -0700424 TRF7970A_ST_LISTENING,
Mark A. Greercb174ab2014-09-02 15:12:46 -0700425 TRF7970A_ST_LISTENING_MD,
Mark A. Greer165063f2014-03-10 11:56:22 -0700426 TRF7970A_ST_MAX
427};
428
429struct trf7970a {
430 enum trf7970a_state state;
431 struct device *dev;
432 struct spi_device *spi;
433 struct regulator *regulator;
434 struct nfc_digital_dev *ddev;
435 u32 quirks;
Mark A. Greer13b42722014-09-02 15:12:45 -0700436 bool is_initiator;
Mark A. Greer165063f2014-03-10 11:56:22 -0700437 bool aborting;
438 struct sk_buff *tx_skb;
439 struct sk_buff *rx_skb;
440 nfc_digital_cmd_complete_t cb;
441 void *cb_arg;
Mark A. Greerebcc5a02014-03-25 08:54:36 -0700442 u8 chip_status_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -0700443 u8 iso_ctrl;
Mark A. Greer49d19cc2014-03-25 08:54:33 -0700444 u8 iso_ctrl_tech;
Mark A. Greer12e9ade2014-03-25 08:54:35 -0700445 u8 modulator_sys_clk_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -0700446 u8 special_fcn_reg1;
Geoff Lansberry49d22c72016-12-21 23:18:33 -0500447 u8 io_ctrl;
Mark A. Greer4e64eff2014-09-02 15:12:24 -0700448 unsigned int guard_time;
Mark A. Greer165063f2014-03-10 11:56:22 -0700449 int technology;
450 int framing;
Mark A. Greercb174ab2014-09-02 15:12:46 -0700451 u8 md_rf_tech;
Mark A. Greer165063f2014-03-10 11:56:22 -0700452 u8 tx_cmd;
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700453 bool issue_eof;
Mark A. Greerab714812015-04-24 10:37:22 -0700454 bool adjust_resp_len;
Mark A. Greer165063f2014-03-10 11:56:22 -0700455 int en2_gpio;
456 int en_gpio;
457 struct mutex lock;
458 unsigned int timeout;
459 bool ignore_timeout;
460 struct delayed_work timeout_work;
461};
462
463
464static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)
465{
466 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode);
467 int ret;
468
469 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd);
470
471 ret = spi_write(trf->spi, &cmd, 1);
472 if (ret)
473 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd,
474 ret);
475 return ret;
476}
477
478static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)
479{
480 u8 addr = TRF7970A_CMD_BIT_RW | reg;
481 int ret;
482
483 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1);
484 if (ret)
485 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
486 ret);
487
488 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val);
489
490 return ret;
491}
492
Mark A. Greer3e7f3352014-09-02 15:12:18 -0700493static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, size_t len)
Mark A. Greer165063f2014-03-10 11:56:22 -0700494{
495 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
Mark A. Greer3e7f3352014-09-02 15:12:18 -0700496 struct spi_transfer t[2];
497 struct spi_message m;
Mark A. Greer165063f2014-03-10 11:56:22 -0700498 int ret;
499
500 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
501
Mark A. Greer3e7f3352014-09-02 15:12:18 -0700502 spi_message_init(&m);
503
504 memset(&t, 0, sizeof(t));
505
506 t[0].tx_buf = &addr;
507 t[0].len = sizeof(addr);
508 spi_message_add_tail(&t[0], &m);
509
510 t[1].rx_buf = buf;
511 t[1].len = len;
512 spi_message_add_tail(&t[1], &m);
513
514 ret = spi_sync(trf->spi, &m);
Mark A. Greer165063f2014-03-10 11:56:22 -0700515 if (ret)
516 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
517 ret);
518 return ret;
519}
520
521static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)
522{
523 u8 buf[2] = { reg, val };
524 int ret;
525
526 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val);
527
528 ret = spi_write(trf->spi, buf, 2);
529 if (ret)
530 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__,
531 buf[0], buf[1], ret);
532
533 return ret;
534}
535
536static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)
537{
538 int ret;
539 u8 buf[2];
540 u8 addr;
541
542 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW;
543
Mark A. Greer772079e2014-08-07 17:41:43 -0700544 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) {
Mark A. Greer165063f2014-03-10 11:56:22 -0700545 addr |= TRF7970A_CMD_BIT_CONTINUOUS;
546 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
547 } else {
548 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1);
549 }
550
551 if (ret)
552 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n",
553 __func__, ret);
554 else
555 *status = buf[0];
556
557 return ret;
558}
559
Mark A. Greercb174ab2014-09-02 15:12:46 -0700560static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto)
561{
562 int ret;
563 u8 buf[2];
564 u8 addr;
565
566 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW |
567 TRF7970A_CMD_BIT_CONTINUOUS;
568
569 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
570 if (ret)
571 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n",
572 __func__, ret);
573 else
574 *target_proto = buf[0];
575
576 return ret;
577}
578
579static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech)
580{
581 int ret;
582 u8 target_proto, tech;
583
584 ret = trf7970a_read_target_proto(trf, &target_proto);
585 if (ret)
586 return ret;
587
588 switch (target_proto) {
589 case TRF79070A_NFC_TARGET_PROTOCOL_106A:
590 tech = NFC_DIGITAL_RF_TECH_106A;
591 break;
592 case TRF79070A_NFC_TARGET_PROTOCOL_106B:
593 tech = NFC_DIGITAL_RF_TECH_106B;
594 break;
595 case TRF79070A_NFC_TARGET_PROTOCOL_212F:
596 tech = NFC_DIGITAL_RF_TECH_212F;
597 break;
598 case TRF79070A_NFC_TARGET_PROTOCOL_424F:
599 tech = NFC_DIGITAL_RF_TECH_424F;
600 break;
601 default:
602 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n",
603 __func__, target_proto);
604 return -EIO;
605 }
606
607 *rf_tech = tech;
608
609 return ret;
610}
611
Mark A. Greer165063f2014-03-10 11:56:22 -0700612static void trf7970a_send_upstream(struct trf7970a *trf)
613{
Mark A. Greer165063f2014-03-10 11:56:22 -0700614 dev_kfree_skb_any(trf->tx_skb);
615 trf->tx_skb = NULL;
616
617 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting)
618 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE,
619 16, 1, trf->rx_skb->data, trf->rx_skb->len,
620 false);
621
Mark A. Greer165063f2014-03-10 11:56:22 -0700622 trf->state = TRF7970A_ST_IDLE;
623
624 if (trf->aborting) {
625 dev_dbg(trf->dev, "Abort process complete\n");
626
627 if (!IS_ERR(trf->rx_skb)) {
628 kfree_skb(trf->rx_skb);
629 trf->rx_skb = ERR_PTR(-ECANCELED);
630 }
631
632 trf->aborting = false;
633 }
634
Mark A. Greerab714812015-04-24 10:37:22 -0700635 if (trf->adjust_resp_len) {
Mark Greeraaee24a2015-08-19 08:58:52 -0700636 if (trf->rx_skb)
637 skb_trim(trf->rx_skb, trf->rx_skb->len - 1);
638
Mark A. Greerab714812015-04-24 10:37:22 -0700639 trf->adjust_resp_len = false;
640 }
641
Mark A. Greer165063f2014-03-10 11:56:22 -0700642 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
643
644 trf->rx_skb = NULL;
645}
646
647static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)
648{
649 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno);
650
Mark A. Greer6fb9edc2014-09-02 15:12:43 -0700651 cancel_delayed_work(&trf->timeout_work);
652
Mark A. Greer165063f2014-03-10 11:56:22 -0700653 kfree_skb(trf->rx_skb);
654 trf->rx_skb = ERR_PTR(errno);
655
656 trf7970a_send_upstream(trf);
657}
658
659static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700660 unsigned int len, u8 *prefix, unsigned int prefix_len)
Mark A. Greer165063f2014-03-10 11:56:22 -0700661{
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700662 struct spi_transfer t[2];
663 struct spi_message m;
Mark A. Greer165063f2014-03-10 11:56:22 -0700664 unsigned int timeout;
665 int ret;
666
667 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE,
668 16, 1, skb->data, len, false);
669
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700670 spi_message_init(&m);
671
672 memset(&t, 0, sizeof(t));
673
674 t[0].tx_buf = prefix;
675 t[0].len = prefix_len;
676 spi_message_add_tail(&t[0], &m);
677
678 t[1].tx_buf = skb->data;
679 t[1].len = len;
680 spi_message_add_tail(&t[1], &m);
681
682 ret = spi_sync(trf->spi, &m);
Mark A. Greer165063f2014-03-10 11:56:22 -0700683 if (ret) {
684 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__,
685 ret);
686 return ret;
687 }
688
689 skb_pull(skb, len);
690
691 if (skb->len > 0) {
692 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO;
693 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT;
694 } else {
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700695 if (trf->issue_eof) {
696 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF;
697 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF;
698 } else {
699 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
Mark A. Greer19618432014-09-02 15:12:44 -0700700
701 if (!trf->timeout)
702 timeout = TRF7970A_WAIT_FOR_TX_IRQ;
703 else
704 timeout = trf->timeout;
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700705 }
Mark A. Greer165063f2014-03-10 11:56:22 -0700706 }
707
708 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout,
709 trf->state);
710
711 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
712
713 return 0;
714}
715
716static void trf7970a_fill_fifo(struct trf7970a *trf)
717{
718 struct sk_buff *skb = trf->tx_skb;
719 unsigned int len;
720 int ret;
721 u8 fifo_bytes;
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700722 u8 prefix;
Mark A. Greer165063f2014-03-10 11:56:22 -0700723
724 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
725 if (ret) {
726 trf7970a_send_err_upstream(trf, ret);
727 return;
728 }
729
730 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
731
Mark A. Greer4542e832014-09-02 15:12:19 -0700732 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
Mark A. Greer165063f2014-03-10 11:56:22 -0700733
734 /* Calculate how much more data can be written to the fifo */
735 len = TRF7970A_FIFO_SIZE - fifo_bytes;
Mark A. Greer0e840ed2014-09-02 15:12:29 -0700736 if (!len) {
737 schedule_delayed_work(&trf->timeout_work,
738 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
739 return;
740 }
741
Mark A. Greer165063f2014-03-10 11:56:22 -0700742 len = min(skb->len, len);
743
Mark A. Greer7a1e5552014-09-02 15:12:28 -0700744 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER;
745
746 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix));
Mark A. Greer165063f2014-03-10 11:56:22 -0700747 if (ret)
748 trf7970a_send_err_upstream(trf, ret);
749}
750
751static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)
752{
753 struct sk_buff *skb = trf->rx_skb;
754 int ret;
755 u8 fifo_bytes;
756
757 if (status & TRF7970A_IRQ_STATUS_ERROR) {
758 trf7970a_send_err_upstream(trf, -EIO);
759 return;
760 }
761
762 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
763 if (ret) {
764 trf7970a_send_err_upstream(trf, ret);
765 return;
766 }
767
768 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
769
Mark A. Greer4542e832014-09-02 15:12:19 -0700770 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
771
Mark A. Greer165063f2014-03-10 11:56:22 -0700772 if (!fifo_bytes)
773 goto no_rx_data;
774
Mark A. Greer165063f2014-03-10 11:56:22 -0700775 if (fifo_bytes > skb_tailroom(skb)) {
776 skb = skb_copy_expand(skb, skb_headroom(skb),
777 max_t(int, fifo_bytes,
778 TRF7970A_RX_SKB_ALLOC_SIZE),
779 GFP_KERNEL);
780 if (!skb) {
781 trf7970a_send_err_upstream(trf, -ENOMEM);
782 return;
783 }
784
785 kfree_skb(trf->rx_skb);
786 trf->rx_skb = skb;
787 }
788
789 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,
790 skb_put(skb, fifo_bytes), fifo_bytes);
791 if (ret) {
792 trf7970a_send_err_upstream(trf, ret);
793 return;
794 }
795
796 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */
797 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) &&
798 (trf->special_fcn_reg1 ==
799 TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {
800 skb->data[0] >>= 4;
801 status = TRF7970A_IRQ_STATUS_SRX;
802 } else {
803 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT;
Mark A. Greer5d8f7592014-09-02 15:12:31 -0700804
805 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
806 if (ret) {
807 trf7970a_send_err_upstream(trf, ret);
808 return;
809 }
810
811 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
812
813 /* If there are bytes in the FIFO, set status to '0' so
814 * the if stmt below doesn't fire and the driver will wait
815 * for the trf7970a to generate another RX interrupt.
816 */
817 if (fifo_bytes)
818 status = 0;
Mark A. Greer165063f2014-03-10 11:56:22 -0700819 }
820
821no_rx_data:
822 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */
823 trf7970a_send_upstream(trf);
824 return;
825 }
826
827 dev_dbg(trf->dev, "Setting timeout for %d ms\n",
828 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT);
829
830 schedule_delayed_work(&trf->timeout_work,
831 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT));
832}
833
834static irqreturn_t trf7970a_irq(int irq, void *dev_id)
835{
836 struct trf7970a *trf = dev_id;
837 int ret;
Mark A. Greer13b42722014-09-02 15:12:45 -0700838 u8 status, fifo_bytes, iso_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -0700839
840 mutex_lock(&trf->lock);
841
Mark A. Greerb5e17d92014-09-02 15:12:34 -0700842 if (trf->state == TRF7970A_ST_RF_OFF) {
Mark A. Greer165063f2014-03-10 11:56:22 -0700843 mutex_unlock(&trf->lock);
844 return IRQ_NONE;
845 }
846
847 ret = trf7970a_read_irqstatus(trf, &status);
848 if (ret) {
849 mutex_unlock(&trf->lock);
850 return IRQ_NONE;
851 }
852
853 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state,
854 status);
855
856 if (!status) {
857 mutex_unlock(&trf->lock);
858 return IRQ_NONE;
859 }
860
861 switch (trf->state) {
862 case TRF7970A_ST_IDLE:
863 case TRF7970A_ST_IDLE_RX_BLOCKED:
Mark A. Greer13b42722014-09-02 15:12:45 -0700864 /* If initiator and getting interrupts caused by RF noise,
865 * turn off the receiver to avoid unnecessary interrupts.
866 * It will be turned back on in trf7970a_send_cmd() when
867 * the next command is issued.
Mark A. Greer165063f2014-03-10 11:56:22 -0700868 */
Mark A. Greer13b42722014-09-02 15:12:45 -0700869 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) {
Mark A. Greer165063f2014-03-10 11:56:22 -0700870 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);
871 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED;
872 }
873
874 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
875 break;
876 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
877 if (status & TRF7970A_IRQ_STATUS_TX) {
878 trf->ignore_timeout =
879 !cancel_delayed_work(&trf->timeout_work);
880 trf7970a_fill_fifo(trf);
881 } else {
882 trf7970a_send_err_upstream(trf, -EIO);
883 }
884 break;
885 case TRF7970A_ST_WAIT_FOR_RX_DATA:
886 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
887 if (status & TRF7970A_IRQ_STATUS_SRX) {
888 trf->ignore_timeout =
889 !cancel_delayed_work(&trf->timeout_work);
890 trf7970a_drain_fifo(trf, status);
Mark A. Greerbece3c52014-09-02 15:12:30 -0700891 } else if (status & TRF7970A_IRQ_STATUS_FIFO) {
892 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,
893 &fifo_bytes);
894
895 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
896
897 if (ret)
898 trf7970a_send_err_upstream(trf, ret);
899 else if (!fifo_bytes)
900 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
Mark A. Greer13b42722014-09-02 15:12:45 -0700901 } else if ((status == TRF7970A_IRQ_STATUS_TX) ||
902 (!trf->is_initiator &&
903 (status == (TRF7970A_IRQ_STATUS_TX |
904 TRF7970A_IRQ_STATUS_NFC_RF)))) {
Mark A. Greer4dd836e2014-03-25 08:54:32 -0700905 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
Mark A. Greer19618432014-09-02 15:12:44 -0700906
907 if (!trf->timeout) {
908 trf->ignore_timeout = !cancel_delayed_work(
909 &trf->timeout_work);
910 trf->rx_skb = ERR_PTR(0);
911 trf7970a_send_upstream(trf);
912 break;
913 }
Mark A. Greer13b42722014-09-02 15:12:45 -0700914
915 if (trf->is_initiator)
916 break;
917
918 iso_ctrl = trf->iso_ctrl;
919
920 switch (trf->framing) {
921 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
922 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
923 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
924 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
925 break;
926 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
927 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
928 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
929 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
930 break;
931 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
932 ret = trf7970a_write(trf,
933 TRF7970A_SPECIAL_FCN_REG1,
934 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL);
935 if (ret)
Mark A. Greerb9e30162014-09-23 11:25:47 -0700936 goto err_unlock_exit;
Mark A. Greer13b42722014-09-02 15:12:45 -0700937
938 trf->special_fcn_reg1 =
939 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL;
940 break;
941 default:
942 break;
943 }
944
945 if (iso_ctrl != trf->iso_ctrl) {
946 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
947 iso_ctrl);
948 if (ret)
Mark A. Greerb9e30162014-09-23 11:25:47 -0700949 goto err_unlock_exit;
Mark A. Greer13b42722014-09-02 15:12:45 -0700950
951 trf->iso_ctrl = iso_ctrl;
952 }
Mark A. Greer4dd836e2014-03-25 08:54:32 -0700953 } else {
Mark A. Greer165063f2014-03-10 11:56:22 -0700954 trf7970a_send_err_upstream(trf, -EIO);
955 }
956 break;
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700957 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
958 if (status != TRF7970A_IRQ_STATUS_TX)
959 trf7970a_send_err_upstream(trf, -EIO);
960 break;
Mark A. Greer13b42722014-09-02 15:12:45 -0700961 case TRF7970A_ST_LISTENING:
962 if (status & TRF7970A_IRQ_STATUS_SRX) {
963 trf->ignore_timeout =
964 !cancel_delayed_work(&trf->timeout_work);
965 trf7970a_drain_fifo(trf, status);
966 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
967 trf7970a_send_err_upstream(trf, -EIO);
968 }
969 break;
Mark A. Greercb174ab2014-09-02 15:12:46 -0700970 case TRF7970A_ST_LISTENING_MD:
971 if (status & TRF7970A_IRQ_STATUS_SRX) {
972 trf->ignore_timeout =
973 !cancel_delayed_work(&trf->timeout_work);
974
975 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech);
976 if (ret) {
977 trf7970a_send_err_upstream(trf, ret);
978 } else {
979 trf->state = TRF7970A_ST_LISTENING;
980 trf7970a_drain_fifo(trf, status);
981 }
982 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
983 trf7970a_send_err_upstream(trf, -EIO);
984 }
985 break;
Mark A. Greer165063f2014-03-10 11:56:22 -0700986 default:
987 dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
988 __func__, trf->state);
989 }
990
Mark A. Greerb9e30162014-09-23 11:25:47 -0700991err_unlock_exit:
Mark A. Greer165063f2014-03-10 11:56:22 -0700992 mutex_unlock(&trf->lock);
993 return IRQ_HANDLED;
994}
995
Mark A. Greer9d9304b2014-03-10 11:56:24 -0700996static void trf7970a_issue_eof(struct trf7970a *trf)
997{
998 int ret;
999
1000 dev_dbg(trf->dev, "Issuing EOF\n");
1001
1002 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
1003 if (ret)
1004 trf7970a_send_err_upstream(trf, ret);
1005
1006 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
1007 if (ret)
1008 trf7970a_send_err_upstream(trf, ret);
1009
1010 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
1011
1012 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n",
1013 trf->timeout, trf->state);
1014
1015 schedule_delayed_work(&trf->timeout_work,
1016 msecs_to_jiffies(trf->timeout));
1017}
1018
Mark A. Greer165063f2014-03-10 11:56:22 -07001019static void trf7970a_timeout_work_handler(struct work_struct *work)
1020{
1021 struct trf7970a *trf = container_of(work, struct trf7970a,
1022 timeout_work.work);
1023
1024 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n",
1025 trf->state, trf->ignore_timeout);
1026
1027 mutex_lock(&trf->lock);
1028
1029 if (trf->ignore_timeout)
1030 trf->ignore_timeout = false;
1031 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)
Mark A. Greerafa5b5f2014-09-02 15:12:32 -07001032 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001033 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
1034 trf7970a_issue_eof(trf);
Mark A. Greer165063f2014-03-10 11:56:22 -07001035 else
1036 trf7970a_send_err_upstream(trf, -ETIMEDOUT);
1037
1038 mutex_unlock(&trf->lock);
1039}
1040
1041static int trf7970a_init(struct trf7970a *trf)
1042{
1043 int ret;
1044
1045 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state);
1046
1047 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);
1048 if (ret)
1049 goto err_out;
1050
1051 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);
1052 if (ret)
1053 goto err_out;
1054
Geoff Lansberry49d22c72016-12-21 23:18:33 -05001055 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
1056 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));
1057 if (ret)
1058 goto err_out;
1059
Geoff Lansberry58d46f52016-04-18 15:48:39 -04001060 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1061 if (ret)
1062 goto err_out;
1063
Mark A. Greer4e007f82014-09-02 15:12:38 -07001064 usleep_range(1000, 2000);
1065
Mark A. Greer7149d6b2014-09-02 15:12:41 -07001066 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1067
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001068 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1069 trf->modulator_sys_clk_ctrl);
Mark A. Greer6c08df42014-09-02 15:12:22 -07001070 if (ret)
1071 goto err_out;
1072
Mark A. Greer165063f2014-03-10 11:56:22 -07001073 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,
1074 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |
1075 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32);
1076 if (ret)
1077 goto err_out;
1078
1079 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);
1080 if (ret)
1081 goto err_out;
1082
1083 trf->special_fcn_reg1 = 0;
1084
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001085 trf->iso_ctrl = 0xff;
Mark A. Greer165063f2014-03-10 11:56:22 -07001086 return 0;
1087
1088err_out:
1089 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
1090 return ret;
1091}
1092
1093static void trf7970a_switch_rf_off(struct trf7970a *trf)
1094{
Mark A. Greercfc708d2014-09-02 15:12:40 -07001095 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1096 (trf->state == TRF7970A_ST_RF_OFF))
1097 return;
1098
Mark A. Greer165063f2014-03-10 11:56:22 -07001099 dev_dbg(trf->dev, "Switching rf off\n");
1100
Mark A. Greera1d2dc52014-03-25 08:54:37 -07001101 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1102
1103 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl);
1104
Mark A. Greer165063f2014-03-10 11:56:22 -07001105 trf->aborting = false;
Mark A. Greerb5e17d92014-09-02 15:12:34 -07001106 trf->state = TRF7970A_ST_RF_OFF;
Mark A. Greere6403b72014-03-25 08:54:38 -07001107
1108 pm_runtime_mark_last_busy(trf->dev);
1109 pm_runtime_put_autosuspend(trf->dev);
Mark A. Greer165063f2014-03-10 11:56:22 -07001110}
1111
Mark A. Greer0a1de842014-09-02 15:12:33 -07001112static int trf7970a_switch_rf_on(struct trf7970a *trf)
Mark A. Greer165063f2014-03-10 11:56:22 -07001113{
Mark A. Greera08e5452014-09-02 15:12:23 -07001114 int ret;
1115
Mark A. Greer165063f2014-03-10 11:56:22 -07001116 dev_dbg(trf->dev, "Switching rf on\n");
1117
Mark A. Greere6403b72014-03-25 08:54:38 -07001118 pm_runtime_get_sync(trf->dev);
Mark A. Greer165063f2014-03-10 11:56:22 -07001119
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001120 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */
1121 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__,
1122 trf->state);
1123 return -EINVAL;
1124 }
1125
Mark A. Greera08e5452014-09-02 15:12:23 -07001126 ret = trf7970a_init(trf);
1127 if (ret) {
1128 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001129 return ret;
Mark A. Greera08e5452014-09-02 15:12:23 -07001130 }
1131
Mark A. Greere6403b72014-03-25 08:54:38 -07001132 trf->state = TRF7970A_ST_IDLE;
Mark A. Greer0a1de842014-09-02 15:12:33 -07001133
1134 return 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001135}
1136
1137static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
1138{
1139 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001140 int ret = 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001141
1142 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on);
1143
1144 mutex_lock(&trf->lock);
1145
1146 if (on) {
1147 switch (trf->state) {
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001148 case TRF7970A_ST_PWR_OFF:
Mark A. Greerb5e17d92014-09-02 15:12:34 -07001149 case TRF7970A_ST_RF_OFF:
Mark A. Greer0a1de842014-09-02 15:12:33 -07001150 ret = trf7970a_switch_rf_on(trf);
Mark A. Greer165063f2014-03-10 11:56:22 -07001151 break;
1152 case TRF7970A_ST_IDLE:
1153 case TRF7970A_ST_IDLE_RX_BLOCKED:
1154 break;
1155 default:
1156 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1157 __func__, trf->state, on);
1158 trf7970a_switch_rf_off(trf);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001159 ret = -EINVAL;
Mark A. Greer165063f2014-03-10 11:56:22 -07001160 }
1161 } else {
1162 switch (trf->state) {
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001163 case TRF7970A_ST_PWR_OFF:
Mark A. Greerb5e17d92014-09-02 15:12:34 -07001164 case TRF7970A_ST_RF_OFF:
Mark A. Greer165063f2014-03-10 11:56:22 -07001165 break;
1166 default:
1167 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1168 __func__, trf->state, on);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001169 ret = -EINVAL;
Mark A. Greer165063f2014-03-10 11:56:22 -07001170 /* FALLTHROUGH */
1171 case TRF7970A_ST_IDLE:
1172 case TRF7970A_ST_IDLE_RX_BLOCKED:
Mark A. Greer13b42722014-09-02 15:12:45 -07001173 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1174 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
Mark A. Greer165063f2014-03-10 11:56:22 -07001175 trf7970a_switch_rf_off(trf);
1176 }
1177 }
1178
1179 mutex_unlock(&trf->lock);
Mark A. Greer0a1de842014-09-02 15:12:33 -07001180 return ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001181}
1182
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001183static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
Mark A. Greer165063f2014-03-10 11:56:22 -07001184{
1185 int ret = 0;
1186
1187 dev_dbg(trf->dev, "rf technology: %d\n", tech);
1188
1189 switch (tech) {
1190 case NFC_DIGITAL_RF_TECH_106A:
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001191 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001192 trf->modulator_sys_clk_ctrl =
1193 (trf->modulator_sys_clk_ctrl & 0xf8) |
1194 TRF7970A_MODULATOR_DEPTH_OOK;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001195 trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
Mark A. Greer165063f2014-03-10 11:56:22 -07001196 break;
Mark A. Greer742b1f92014-03-31 17:52:33 -07001197 case NFC_DIGITAL_RF_TECH_106B:
1198 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001199 trf->modulator_sys_clk_ctrl =
1200 (trf->modulator_sys_clk_ctrl & 0xf8) |
1201 TRF7970A_MODULATOR_DEPTH_ASK10;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001202 trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
Mark A. Greer742b1f92014-03-31 17:52:33 -07001203 break;
Mark A. Greer6857bb92014-04-14 10:04:10 -07001204 case NFC_DIGITAL_RF_TECH_212F:
1205 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001206 trf->modulator_sys_clk_ctrl =
1207 (trf->modulator_sys_clk_ctrl & 0xf8) |
1208 TRF7970A_MODULATOR_DEPTH_ASK10;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001209 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
Mark A. Greer6857bb92014-04-14 10:04:10 -07001210 break;
1211 case NFC_DIGITAL_RF_TECH_424F:
1212 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001213 trf->modulator_sys_clk_ctrl =
1214 (trf->modulator_sys_clk_ctrl & 0xf8) |
1215 TRF7970A_MODULATOR_DEPTH_ASK10;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001216 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
Mark A. Greer6857bb92014-04-14 10:04:10 -07001217 break;
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001218 case NFC_DIGITAL_RF_TECH_ISO15693:
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001219 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001220 trf->modulator_sys_clk_ctrl =
1221 (trf->modulator_sys_clk_ctrl & 0xf8) |
1222 TRF7970A_MODULATOR_DEPTH_OOK;
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001223 trf->guard_time = TRF7970A_GUARD_TIME_15693;
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001224 break;
Mark A. Greer165063f2014-03-10 11:56:22 -07001225 default:
1226 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1227 return -EINVAL;
1228 }
1229
1230 trf->technology = tech;
1231
Mark A. Greer13b42722014-09-02 15:12:45 -07001232 /* If in initiator mode and not changing the RF tech due to a
1233 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from
1234 * trf7970a_init()), clear the NFC Target Detection Level register
1235 * due to erratum.
1236 */
1237 if (trf->iso_ctrl == 0xff)
1238 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1239
Mark A. Greer165063f2014-03-10 11:56:22 -07001240 return ret;
1241}
1242
Mark A. Greer851ee3c2014-09-02 15:12:42 -07001243static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)
1244{
1245 int ret;
1246 u8 rssi;
1247
1248 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1249 trf->chip_status_ctrl | TRF7970A_CHIP_STATUS_REC_ON);
1250 if (ret)
1251 return ret;
1252
1253 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);
1254 if (ret)
1255 return ret;
1256
1257 usleep_range(50, 60);
1258
1259 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi);
1260 if (ret)
1261 return ret;
1262
1263 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1264 trf->chip_status_ctrl);
1265 if (ret)
1266 return ret;
1267
1268 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK)
1269 *is_rf_field = true;
1270 else
1271 *is_rf_field = false;
1272
1273 return 0;
1274}
1275
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001276static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)
Mark A. Greer165063f2014-03-10 11:56:22 -07001277{
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001278 u8 iso_ctrl = trf->iso_ctrl_tech;
Mark A. Greer851ee3c2014-09-02 15:12:42 -07001279 bool is_rf_field = false;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001280 int ret;
1281
Mark A. Greer165063f2014-03-10 11:56:22 -07001282 dev_dbg(trf->dev, "framing: %d\n", framing);
1283
1284 switch (framing) {
1285 case NFC_DIGITAL_FRAMING_NFCA_SHORT:
1286 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1287 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001288 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
Mark A. Greer165063f2014-03-10 11:56:22 -07001289 break;
1290 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
Mark A. Greer80062892014-03-10 11:56:23 -07001291 case NFC_DIGITAL_FRAMING_NFCA_T4T:
Mark A. Greer742b1f92014-03-31 17:52:33 -07001292 case NFC_DIGITAL_FRAMING_NFCB:
1293 case NFC_DIGITAL_FRAMING_NFCB_T4T:
Mark A. Greer6857bb92014-04-14 10:04:10 -07001294 case NFC_DIGITAL_FRAMING_NFCF:
1295 case NFC_DIGITAL_FRAMING_NFCF_T3T:
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001296 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
1297 case NFC_DIGITAL_FRAMING_ISO15693_T5T:
Mark A. Greer13b42722014-09-02 15:12:45 -07001298 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1299 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
Mark A. Greer165063f2014-03-10 11:56:22 -07001300 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001301 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
Mark A. Greer165063f2014-03-10 11:56:22 -07001302 break;
1303 case NFC_DIGITAL_FRAMING_NFCA_T2T:
1304 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001305 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
Mark A. Greer165063f2014-03-10 11:56:22 -07001306 break;
1307 default:
1308 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1309 return -EINVAL;
1310 }
1311
1312 trf->framing = framing;
1313
Mark A. Greer851ee3c2014-09-02 15:12:42 -07001314 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1315 ret = trf7970a_is_rf_field(trf, &is_rf_field);
1316 if (ret)
1317 return ret;
1318
1319 if (is_rf_field)
1320 return -EBUSY;
1321 }
1322
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001323 if (iso_ctrl != trf->iso_ctrl) {
1324 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1325 if (ret)
1326 return ret;
1327
1328 trf->iso_ctrl = iso_ctrl;
Mark A. Greera0822a72014-03-25 08:54:34 -07001329
1330 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
Mark A. Greer12e9ade2014-03-25 08:54:35 -07001331 trf->modulator_sys_clk_ctrl);
Mark A. Greera0822a72014-03-25 08:54:34 -07001332 if (ret)
1333 return ret;
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001334 }
1335
Mark A. Greera1d2dc52014-03-25 08:54:37 -07001336 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1337 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1338 trf->chip_status_ctrl |
1339 TRF7970A_CHIP_STATUS_RF_ON);
1340 if (ret)
1341 return ret;
1342
1343 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1344
Mark A. Greer4e64eff2014-09-02 15:12:24 -07001345 usleep_range(trf->guard_time, trf->guard_time + 1000);
Mark A. Greera1d2dc52014-03-25 08:54:37 -07001346 }
1347
Mark A. Greer49d19cc2014-03-25 08:54:33 -07001348 return 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001349}
1350
1351static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,
1352 int param)
1353{
1354 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
Mark A. Greer18422e62014-03-25 08:54:39 -07001355 int ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001356
1357 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1358
1359 mutex_lock(&trf->lock);
1360
Mark A. Greer13b42722014-09-02 15:12:45 -07001361 trf->is_initiator = true;
1362
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001363 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1364 (trf->state == TRF7970A_ST_RF_OFF)) {
Mark A. Greer0a1de842014-09-02 15:12:33 -07001365 ret = trf7970a_switch_rf_on(trf);
1366 if (ret)
1367 goto err_unlock;
1368 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001369
1370 switch (type) {
1371 case NFC_DIGITAL_CONFIG_RF_TECH:
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001372 ret = trf7970a_in_config_rf_tech(trf, param);
Mark A. Greer165063f2014-03-10 11:56:22 -07001373 break;
1374 case NFC_DIGITAL_CONFIG_FRAMING:
Mark A. Greer307e5ca2014-09-02 15:12:39 -07001375 ret = trf7970a_in_config_framing(trf, param);
Mark A. Greer165063f2014-03-10 11:56:22 -07001376 break;
1377 default:
1378 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1379 ret = -EINVAL;
1380 }
1381
Mark A. Greer0a1de842014-09-02 15:12:33 -07001382err_unlock:
Mark A. Greer165063f2014-03-10 11:56:22 -07001383 mutex_unlock(&trf->lock);
1384 return ret;
1385}
1386
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001387static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
1388{
1389 switch (cmd) {
1390 case ISO15693_CMD_WRITE_SINGLE_BLOCK:
1391 case ISO15693_CMD_LOCK_BLOCK:
1392 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK:
1393 case ISO15693_CMD_WRITE_AFI:
1394 case ISO15693_CMD_LOCK_AFI:
1395 case ISO15693_CMD_WRITE_DSFID:
1396 case ISO15693_CMD_LOCK_DSFID:
1397 return 1;
1398 break;
1399 default:
1400 return 0;
1401 }
1402}
1403
Mark A. Greer165063f2014-03-10 11:56:22 -07001404static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
1405{
1406 u8 *req = skb->data;
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001407 u8 special_fcn_reg1, iso_ctrl;
Mark A. Greer165063f2014-03-10 11:56:22 -07001408 int ret;
1409
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001410 trf->issue_eof = false;
1411
Mark A. Greer165063f2014-03-10 11:56:22 -07001412 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in
1413 * special functions register 1 is cleared; otherwise, its a write or
1414 * sector select command and '4_bit_RX' must be set.
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001415 *
1416 * When issuing an ISO 15693 command, inspect the flags byte to see
1417 * what speed to use. Also, remember if the OPTION flag is set on
1418 * a Type 5 write or lock command so the driver will know that it
1419 * has to send an EOF in order to get a response.
Mark A. Greer165063f2014-03-10 11:56:22 -07001420 */
1421 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) &&
1422 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {
1423 if (req[0] == NFC_T2T_CMD_READ)
1424 special_fcn_reg1 = 0;
1425 else
1426 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX;
1427
1428 if (special_fcn_reg1 != trf->special_fcn_reg1) {
1429 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,
1430 special_fcn_reg1);
1431 if (ret)
1432 return ret;
1433
1434 trf->special_fcn_reg1 = special_fcn_reg1;
1435 }
Mark A. Greer9d9304b2014-03-10 11:56:24 -07001436 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) {
1437 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;
1438
1439 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) {
1440 case 0x00:
1441 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662;
1442 break;
1443 case ISO15693_REQ_FLAG_SUB_CARRIER:
1444 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a;
1445 break;
1446 case ISO15693_REQ_FLAG_DATA_RATE:
1447 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1448 break;
1449 case (ISO15693_REQ_FLAG_SUB_CARRIER |
1450 ISO15693_REQ_FLAG_DATA_RATE):
1451 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669;
1452 break;
1453 }
1454
1455 if (iso_ctrl != trf->iso_ctrl) {
1456 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1457 if (ret)
1458 return ret;
1459
1460 trf->iso_ctrl = iso_ctrl;
1461 }
1462
Mark A. Greerab714812015-04-24 10:37:22 -07001463 if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) {
1464 if (trf7970a_is_iso15693_write_or_lock(req[1]) &&
1465 (req[0] & ISO15693_REQ_FLAG_OPTION))
1466 trf->issue_eof = true;
1467 else if ((trf->quirks &
1468 TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) &&
1469 (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK))
1470 trf->adjust_resp_len = true;
1471 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001472 }
1473
1474 return 0;
1475}
1476
Mark A. Greer13b42722014-09-02 15:12:45 -07001477static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,
Mark A. Greer165063f2014-03-10 11:56:22 -07001478 struct sk_buff *skb, u16 timeout,
1479 nfc_digital_cmd_complete_t cb, void *arg)
1480{
1481 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
Mark A. Greer7a1e5552014-09-02 15:12:28 -07001482 u8 prefix[5];
Mark A. Greer165063f2014-03-10 11:56:22 -07001483 unsigned int len;
1484 int ret;
Mark A. Greeraff05642014-09-02 15:12:26 -07001485 u8 status;
Mark A. Greer165063f2014-03-10 11:56:22 -07001486
1487 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
1488 trf->state, timeout, skb->len);
1489
1490 if (skb->len > TRF7970A_TX_MAX)
1491 return -EINVAL;
1492
1493 mutex_lock(&trf->lock);
1494
1495 if ((trf->state != TRF7970A_ST_IDLE) &&
1496 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1497 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1498 trf->state);
1499 ret = -EIO;
1500 goto out_err;
1501 }
1502
1503 if (trf->aborting) {
1504 dev_dbg(trf->dev, "Abort process complete\n");
1505 trf->aborting = false;
1506 ret = -ECANCELED;
1507 goto out_err;
1508 }
1509
Mark A. Greer19618432014-09-02 15:12:44 -07001510 if (timeout) {
1511 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1512 GFP_KERNEL);
1513 if (!trf->rx_skb) {
1514 dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1515 ret = -ENOMEM;
1516 goto out_err;
1517 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001518 }
1519
1520 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) {
1521 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1522 if (ret)
1523 goto out_err;
1524
1525 trf->state = TRF7970A_ST_IDLE;
1526 }
1527
Mark A. Greer13b42722014-09-02 15:12:45 -07001528 if (trf->is_initiator) {
1529 ret = trf7970a_per_cmd_config(trf, skb);
1530 if (ret)
1531 goto out_err;
1532 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001533
1534 trf->ddev = ddev;
1535 trf->tx_skb = skb;
1536 trf->cb = cb;
1537 trf->cb_arg = arg;
1538 trf->timeout = timeout;
1539 trf->ignore_timeout = false;
1540
1541 len = skb->len;
Mark A. Greer165063f2014-03-10 11:56:22 -07001542
1543 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
1544 * on what the current framing is, the address of the TX length byte 1
1545 * register (0x1d), and the 2 byte length of the data to be transmitted.
Mark A. Greer7a1e5552014-09-02 15:12:28 -07001546 * That totals 5 bytes.
Mark A. Greer165063f2014-03-10 11:56:22 -07001547 */
1548 prefix[0] = TRF7970A_CMD_BIT_CTRL |
1549 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET);
1550 prefix[1] = TRF7970A_CMD_BIT_CTRL |
1551 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd);
1552 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1;
1553
1554 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {
1555 prefix[3] = 0x00;
1556 prefix[4] = 0x0f; /* 7 bits */
1557 } else {
1558 prefix[3] = (len & 0xf00) >> 4;
1559 prefix[3] |= ((len & 0xf0) >> 4);
1560 prefix[4] = ((len & 0x0f) << 4);
1561 }
1562
1563 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
1564
Mark A. Greeraff05642014-09-02 15:12:26 -07001565 /* Clear possible spurious interrupt */
1566 ret = trf7970a_read_irqstatus(trf, &status);
1567 if (ret)
1568 goto out_err;
1569
Mark A. Greer7a1e5552014-09-02 15:12:28 -07001570 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));
Mark A. Greer165063f2014-03-10 11:56:22 -07001571 if (ret) {
1572 kfree_skb(trf->rx_skb);
1573 trf->rx_skb = NULL;
1574 }
1575
1576out_err:
1577 mutex_unlock(&trf->lock);
1578 return ret;
1579}
1580
Mark A. Greer13b42722014-09-02 15:12:45 -07001581static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)
Mark A. Greer165063f2014-03-10 11:56:22 -07001582{
Mark A. Greer13b42722014-09-02 15:12:45 -07001583 int ret = 0;
Mark A. Greer165063f2014-03-10 11:56:22 -07001584
Mark A. Greer13b42722014-09-02 15:12:45 -07001585 dev_dbg(trf->dev, "rf technology: %d\n", tech);
Mark A. Greer165063f2014-03-10 11:56:22 -07001586
Mark A. Greer13b42722014-09-02 15:12:45 -07001587 switch (tech) {
1588 case NFC_DIGITAL_RF_TECH_106A:
1589 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1590 TRF7970A_ISO_CTRL_NFC_CE |
1591 TRF7970A_ISO_CTRL_NFC_CE_14443A;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001592 trf->modulator_sys_clk_ctrl =
1593 (trf->modulator_sys_clk_ctrl & 0xf8) |
1594 TRF7970A_MODULATOR_DEPTH_OOK;
Mark A. Greer13b42722014-09-02 15:12:45 -07001595 break;
1596 case NFC_DIGITAL_RF_TECH_212F:
1597 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1598 TRF7970A_ISO_CTRL_NFC_NFCF_212;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001599 trf->modulator_sys_clk_ctrl =
1600 (trf->modulator_sys_clk_ctrl & 0xf8) |
1601 TRF7970A_MODULATOR_DEPTH_ASK10;
Mark A. Greer13b42722014-09-02 15:12:45 -07001602 break;
1603 case NFC_DIGITAL_RF_TECH_424F:
1604 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1605 TRF7970A_ISO_CTRL_NFC_NFCF_424;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05001606 trf->modulator_sys_clk_ctrl =
1607 (trf->modulator_sys_clk_ctrl & 0xf8) |
1608 TRF7970A_MODULATOR_DEPTH_ASK10;
Mark A. Greer13b42722014-09-02 15:12:45 -07001609 break;
1610 default:
1611 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1612 return -EINVAL;
1613 }
1614
1615 trf->technology = tech;
1616
1617 /* Normally we write the ISO_CTRL register in
1618 * trf7970a_tg_config_framing() because the framing can change
1619 * the value written. However, when sending a PSL RES,
1620 * digital_tg_send_psl_res_complete() doesn't call
1621 * trf7970a_tg_config_framing() so we must write the register
1622 * here.
1623 */
1624 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) &&
1625 (trf->iso_ctrl_tech != trf->iso_ctrl)) {
1626 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
1627 trf->iso_ctrl_tech);
1628
1629 trf->iso_ctrl = trf->iso_ctrl_tech;
1630 }
1631
1632 return ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001633}
1634
Mark A. Greer13b42722014-09-02 15:12:45 -07001635/* Since this is a target routine, several of the framing calls are
1636 * made between receiving the request and sending the response so they
1637 * should take effect until after the response is sent. This is accomplished
1638 * by skipping the ISO_CTRL register write here and doing it in the interrupt
1639 * handler.
1640 */
1641static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing)
1642{
1643 u8 iso_ctrl = trf->iso_ctrl_tech;
1644 int ret;
1645
1646 dev_dbg(trf->dev, "framing: %d\n", framing);
1647
1648 switch (framing) {
1649 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1650 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1651 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1652 break;
1653 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1654 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1655 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
1656 /* These ones are applied in the interrupt handler */
1657 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */
1658 break;
1659 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1660 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1661 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1662 break;
1663 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED:
1664 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1665 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1666 break;
1667 default:
1668 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1669 return -EINVAL;
1670 }
1671
1672 trf->framing = framing;
1673
1674 if (iso_ctrl != trf->iso_ctrl) {
1675 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1676 if (ret)
1677 return ret;
1678
1679 trf->iso_ctrl = iso_ctrl;
1680
1681 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1682 trf->modulator_sys_clk_ctrl);
1683 if (ret)
1684 return ret;
1685 }
1686
1687 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1688 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1689 trf->chip_status_ctrl |
1690 TRF7970A_CHIP_STATUS_RF_ON);
1691 if (ret)
1692 return ret;
1693
1694 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1695 }
1696
1697 return 0;
1698}
1699
1700static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
1701 int param)
1702{
1703 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1704 int ret;
1705
1706 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1707
1708 mutex_lock(&trf->lock);
1709
1710 trf->is_initiator = false;
1711
1712 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1713 (trf->state == TRF7970A_ST_RF_OFF)) {
1714 ret = trf7970a_switch_rf_on(trf);
1715 if (ret)
1716 goto err_unlock;
1717 }
1718
1719 switch (type) {
1720 case NFC_DIGITAL_CONFIG_RF_TECH:
1721 ret = trf7970a_tg_config_rf_tech(trf, param);
1722 break;
1723 case NFC_DIGITAL_CONFIG_FRAMING:
1724 ret = trf7970a_tg_config_framing(trf, param);
1725 break;
1726 default:
1727 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1728 ret = -EINVAL;
1729 }
1730
1731err_unlock:
1732 mutex_unlock(&trf->lock);
1733 return ret;
1734}
1735
Mark A. Greercb174ab2014-09-02 15:12:46 -07001736static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1737 nfc_digital_cmd_complete_t cb, void *arg, bool mode_detect)
Mark A. Greer165063f2014-03-10 11:56:22 -07001738{
1739 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
Mark A. Greer13b42722014-09-02 15:12:45 -07001740 int ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001741
Mark A. Greer13b42722014-09-02 15:12:45 -07001742 mutex_lock(&trf->lock);
Mark A. Greer165063f2014-03-10 11:56:22 -07001743
Mark A. Greer13b42722014-09-02 15:12:45 -07001744 if ((trf->state != TRF7970A_ST_IDLE) &&
1745 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1746 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1747 trf->state);
1748 ret = -EIO;
1749 goto out_err;
1750 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001751
Mark A. Greer13b42722014-09-02 15:12:45 -07001752 if (trf->aborting) {
1753 dev_dbg(trf->dev, "Abort process complete\n");
1754 trf->aborting = false;
1755 ret = -ECANCELED;
1756 goto out_err;
1757 }
Mark A. Greer165063f2014-03-10 11:56:22 -07001758
Mark A. Greer13b42722014-09-02 15:12:45 -07001759 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1760 GFP_KERNEL);
1761 if (!trf->rx_skb) {
1762 dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1763 ret = -ENOMEM;
1764 goto out_err;
1765 }
1766
1767 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS,
1768 TRF7970A_RX_SPECIAL_SETTINGS_HBT |
1769 TRF7970A_RX_SPECIAL_SETTINGS_M848 |
1770 TRF7970A_RX_SPECIAL_SETTINGS_C424 |
1771 TRF7970A_RX_SPECIAL_SETTINGS_C212);
1772 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001773 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001774
1775 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
Geoff Lansberry49d22c72016-12-21 23:18:33 -05001776 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));
Mark A. Greer13b42722014-09-02 15:12:45 -07001777 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001778 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001779
1780 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL,
1781 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3));
1782 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001783 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001784
1785 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL,
1786 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7));
1787 if (ret)
Mark A. Greerfc0ae242014-09-23 11:25:48 -07001788 goto out_err;
Mark A. Greer13b42722014-09-02 15:12:45 -07001789
1790 trf->ddev = ddev;
1791 trf->cb = cb;
1792 trf->cb_arg = arg;
1793 trf->timeout = timeout;
1794 trf->ignore_timeout = false;
1795
1796 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1797 if (ret)
1798 goto out_err;
1799
Mark A. Greercb174ab2014-09-02 15:12:46 -07001800 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD :
1801 TRF7970A_ST_LISTENING;
Mark A. Greer13b42722014-09-02 15:12:45 -07001802
1803 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
1804
1805out_err:
1806 mutex_unlock(&trf->lock);
1807 return ret;
Mark A. Greer165063f2014-03-10 11:56:22 -07001808}
1809
Mark A. Greercb174ab2014-09-02 15:12:46 -07001810static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1811 nfc_digital_cmd_complete_t cb, void *arg)
1812{
1813 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1814
1815 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n",
1816 trf->state, timeout);
1817
1818 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false);
1819}
1820
1821static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev,
1822 u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
1823{
1824 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1825 int ret;
1826
1827 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n",
1828 trf->state, timeout);
1829
1830 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1831 NFC_DIGITAL_RF_TECH_106A);
1832 if (ret)
1833 return ret;
1834
1835 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1836 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1837 if (ret)
1838 return ret;
1839
1840 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true);
1841}
1842
1843static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech)
1844{
1845 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1846
1847 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n",
1848 trf->state, trf->md_rf_tech);
1849
1850 *rf_tech = trf->md_rf_tech;
1851
1852 return 0;
1853}
1854
Mark A. Greer165063f2014-03-10 11:56:22 -07001855static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)
1856{
1857 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1858
1859 dev_dbg(trf->dev, "Abort process initiated\n");
1860
1861 mutex_lock(&trf->lock);
Mark A. Greer5876bc72014-03-25 08:54:30 -07001862
1863 switch (trf->state) {
1864 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1865 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1866 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1867 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
1868 trf->aborting = true;
1869 break;
Mark A. Greer13b42722014-09-02 15:12:45 -07001870 case TRF7970A_ST_LISTENING:
1871 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work);
1872 trf7970a_send_err_upstream(trf, -ECANCELED);
1873 dev_dbg(trf->dev, "Abort process complete\n");
1874 break;
Mark A. Greer5876bc72014-03-25 08:54:30 -07001875 default:
1876 break;
1877 }
1878
Mark A. Greer165063f2014-03-10 11:56:22 -07001879 mutex_unlock(&trf->lock);
1880}
1881
1882static struct nfc_digital_ops trf7970a_nfc_ops = {
1883 .in_configure_hw = trf7970a_in_configure_hw,
Mark A. Greer13b42722014-09-02 15:12:45 -07001884 .in_send_cmd = trf7970a_send_cmd,
Mark A. Greer165063f2014-03-10 11:56:22 -07001885 .tg_configure_hw = trf7970a_tg_configure_hw,
Mark A. Greer13b42722014-09-02 15:12:45 -07001886 .tg_send_cmd = trf7970a_send_cmd,
Mark A. Greer165063f2014-03-10 11:56:22 -07001887 .tg_listen = trf7970a_tg_listen,
Mark A. Greercb174ab2014-09-02 15:12:46 -07001888 .tg_listen_md = trf7970a_tg_listen_md,
1889 .tg_get_rf_tech = trf7970a_tg_get_rf_tech,
Mark A. Greer165063f2014-03-10 11:56:22 -07001890 .switch_rf = trf7970a_switch_rf,
1891 .abort_cmd = trf7970a_abort_cmd,
1892};
1893
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001894static int trf7970a_power_up(struct trf7970a *trf)
1895{
1896 int ret;
1897
1898 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state);
1899
1900 if (trf->state != TRF7970A_ST_PWR_OFF)
1901 return 0;
1902
1903 ret = regulator_enable(trf->regulator);
1904 if (ret) {
1905 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret);
1906 return ret;
1907 }
1908
1909 usleep_range(5000, 6000);
1910
1911 if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) {
Guan Bence69b952017-02-07 06:22:04 +01001912 if (gpio_is_valid(trf->en2_gpio)) {
1913 gpio_set_value(trf->en2_gpio, 1);
1914 usleep_range(1000, 2000);
1915 }
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001916 }
1917
1918 gpio_set_value(trf->en_gpio, 1);
1919
1920 usleep_range(20000, 21000);
1921
1922 trf->state = TRF7970A_ST_RF_OFF;
1923
1924 return 0;
1925}
1926
1927static int trf7970a_power_down(struct trf7970a *trf)
1928{
1929 int ret;
1930
1931 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state);
1932
1933 if (trf->state == TRF7970A_ST_PWR_OFF)
1934 return 0;
1935
1936 if (trf->state != TRF7970A_ST_RF_OFF) {
1937 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n",
1938 trf->state);
1939 return -EBUSY;
1940 }
1941
1942 gpio_set_value(trf->en_gpio, 0);
Mark Greer67dec192017-04-25 15:43:49 -07001943
1944 if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW))
1945 if (gpio_is_valid(trf->en2_gpio))
1946 gpio_set_value(trf->en2_gpio, 0);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07001947
1948 ret = regulator_disable(trf->regulator);
1949 if (ret)
1950 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__,
1951 ret);
1952
1953 trf->state = TRF7970A_ST_PWR_OFF;
1954
1955 return ret;
1956}
1957
Mark A. Greerb5282812014-09-02 15:12:36 -07001958static int trf7970a_startup(struct trf7970a *trf)
1959{
1960 int ret;
1961
1962 ret = trf7970a_power_up(trf);
1963 if (ret)
1964 return ret;
1965
1966 pm_runtime_set_active(trf->dev);
1967 pm_runtime_enable(trf->dev);
1968 pm_runtime_mark_last_busy(trf->dev);
1969
1970 return 0;
1971}
1972
1973static void trf7970a_shutdown(struct trf7970a *trf)
1974{
1975 switch (trf->state) {
1976 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1977 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1978 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1979 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
Mark A. Greer13b42722014-09-02 15:12:45 -07001980 case TRF7970A_ST_LISTENING:
Mark A. Greerb5282812014-09-02 15:12:36 -07001981 trf7970a_send_err_upstream(trf, -ECANCELED);
1982 /* FALLTHROUGH */
1983 case TRF7970A_ST_IDLE:
1984 case TRF7970A_ST_IDLE_RX_BLOCKED:
1985 trf7970a_switch_rf_off(trf);
1986 break;
1987 default:
1988 break;
1989 }
1990
1991 pm_runtime_disable(trf->dev);
1992 pm_runtime_set_suspended(trf->dev);
1993
1994 trf7970a_power_down(trf);
1995}
1996
Mark A. Greerfd0c8282014-03-25 08:54:40 -07001997static int trf7970a_get_autosuspend_delay(struct device_node *np)
1998{
1999 int autosuspend_delay, ret;
2000
2001 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay);
2002 if (ret)
2003 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY;
2004
Mark A. Greerfd0c8282014-03-25 08:54:40 -07002005 return autosuspend_delay;
2006}
2007
Mark A. Greer3bd14232014-08-07 17:41:41 -07002008static int trf7970a_get_vin_voltage_override(struct device_node *np,
2009 u32 *vin_uvolts)
2010{
2011 return of_property_read_u32(np, "vin-voltage-override", vin_uvolts);
2012}
2013
Mark A. Greer165063f2014-03-10 11:56:22 -07002014static int trf7970a_probe(struct spi_device *spi)
2015{
2016 struct device_node *np = spi->dev.of_node;
Mark A. Greer165063f2014-03-10 11:56:22 -07002017 struct trf7970a *trf;
Mark A. Greerfd0c8282014-03-25 08:54:40 -07002018 int uvolts, autosuspend_delay, ret;
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05002019 u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY;
Mark A. Greer165063f2014-03-10 11:56:22 -07002020
2021 if (!np) {
2022 dev_err(&spi->dev, "No Device Tree entry\n");
2023 return -EINVAL;
2024 }
2025
2026 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL);
2027 if (!trf)
2028 return -ENOMEM;
2029
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002030 trf->state = TRF7970A_ST_PWR_OFF;
Mark A. Greer165063f2014-03-10 11:56:22 -07002031 trf->dev = &spi->dev;
2032 trf->spi = spi;
Mark A. Greer165063f2014-03-10 11:56:22 -07002033
2034 spi->mode = SPI_MODE_1;
2035 spi->bits_per_word = 8;
2036
Mark A. Greer24707292014-09-02 15:12:17 -07002037 ret = spi_setup(spi);
2038 if (ret < 0) {
2039 dev_err(trf->dev, "Can't set up SPI Communication\n");
2040 return ret;
2041 }
2042
Mark A. Greerab714812015-04-24 10:37:22 -07002043 if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk"))
2044 trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE;
2045
Mark A. Greer772079e2014-08-07 17:41:43 -07002046 if (of_property_read_bool(np, "irq-status-read-quirk"))
2047 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ;
2048
Mark Greer69f984f2017-04-25 15:43:50 -07002049 /* There are two enable pins - only EN must be present in the DT */
Mark A. Greer165063f2014-03-10 11:56:22 -07002050 trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0);
2051 if (!gpio_is_valid(trf->en_gpio)) {
2052 dev_err(trf->dev, "No EN GPIO property\n");
2053 return trf->en_gpio;
2054 }
2055
2056 ret = devm_gpio_request_one(trf->dev, trf->en_gpio,
Mark A. Greerf23b7352014-08-07 17:41:47 -07002057 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN");
Mark A. Greer165063f2014-03-10 11:56:22 -07002058 if (ret) {
2059 dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret);
2060 return ret;
2061 }
2062
2063 trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1);
2064 if (!gpio_is_valid(trf->en2_gpio)) {
Guan Bence69b952017-02-07 06:22:04 +01002065 dev_info(trf->dev, "No EN2 GPIO property\n");
2066 } else {
2067 ret = devm_gpio_request_one(trf->dev, trf->en2_gpio,
2068 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2");
2069 if (ret) {
2070 dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret);
2071 return ret;
2072 }
Mark Greerafcb9fb2017-04-25 15:43:51 -07002073
2074 if (of_property_read_bool(np, "en2-rf-quirk"))
2075 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
Mark A. Greer165063f2014-03-10 11:56:22 -07002076 }
2077
Geoff Lansberry837eb4d2016-12-21 23:18:32 -05002078 of_property_read_u32(np, "clock-frequency", &clk_freq);
2079 if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) ||
2080 (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) {
2081 dev_err(trf->dev,
2082 "clock-frequency (%u Hz) unsupported\n",
2083 clk_freq);
2084 return -EINVAL;
2085 }
2086
Mark A. Greer165063f2014-03-10 11:56:22 -07002087 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
2088 trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
2089 "trf7970a", trf);
2090 if (ret) {
2091 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
2092 return ret;
2093 }
2094
2095 mutex_init(&trf->lock);
2096 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
2097
2098 trf->regulator = devm_regulator_get(&spi->dev, "vin");
2099 if (IS_ERR(trf->regulator)) {
2100 ret = PTR_ERR(trf->regulator);
2101 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
2102 goto err_destroy_lock;
2103 }
2104
2105 ret = regulator_enable(trf->regulator);
2106 if (ret) {
2107 dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
2108 goto err_destroy_lock;
2109 }
2110
Mark A. Greer3bd14232014-08-07 17:41:41 -07002111 ret = trf7970a_get_vin_voltage_override(np, &uvolts);
2112 if (ret)
2113 uvolts = regulator_get_voltage(trf->regulator);
Mark A. Greerebcc5a02014-03-25 08:54:36 -07002114
2115 if (uvolts > 4000000)
2116 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;
2117
Geoff Lansberry49d22c72016-12-21 23:18:33 -05002118 trf->regulator = devm_regulator_get(&spi->dev, "vdd-io");
2119 if (IS_ERR(trf->regulator)) {
2120 ret = PTR_ERR(trf->regulator);
2121 dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret);
2122 goto err_destroy_lock;
2123 }
2124
2125 ret = regulator_enable(trf->regulator);
2126 if (ret) {
2127 dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret);
2128 goto err_destroy_lock;
2129 }
2130
2131 if (regulator_get_voltage(trf->regulator) == 1800000) {
2132 trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW;
2133 dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n");
2134 }
2135
Mark A. Greer165063f2014-03-10 11:56:22 -07002136 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
2137 TRF7970A_SUPPORTED_PROTOCOLS,
Mark A. Greer13b42722014-09-02 15:12:45 -07002138 NFC_DIGITAL_DRV_CAPS_IN_CRC |
2139 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 0);
Mark A. Greer165063f2014-03-10 11:56:22 -07002140 if (!trf->ddev) {
2141 dev_err(trf->dev, "Can't allocate NFC digital device\n");
2142 ret = -ENOMEM;
2143 goto err_disable_regulator;
2144 }
2145
2146 nfc_digital_set_parent_dev(trf->ddev, trf->dev);
2147 nfc_digital_set_drvdata(trf->ddev, trf);
2148 spi_set_drvdata(spi, trf);
2149
Mark A. Greerfd0c8282014-03-25 08:54:40 -07002150 autosuspend_delay = trf7970a_get_autosuspend_delay(np);
2151
2152 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
Mark A. Greere6403b72014-03-25 08:54:38 -07002153 pm_runtime_use_autosuspend(trf->dev);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002154
Mark A. Greerb5282812014-09-02 15:12:36 -07002155 ret = trf7970a_startup(trf);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002156 if (ret)
2157 goto err_free_ddev;
2158
Mark A. Greer165063f2014-03-10 11:56:22 -07002159 ret = nfc_digital_register_device(trf->ddev);
2160 if (ret) {
2161 dev_err(trf->dev, "Can't register NFC digital device: %d\n",
2162 ret);
Mark A. Greerb5282812014-09-02 15:12:36 -07002163 goto err_shutdown;
Mark A. Greer165063f2014-03-10 11:56:22 -07002164 }
2165
2166 return 0;
2167
Mark A. Greerb5282812014-09-02 15:12:36 -07002168err_shutdown:
2169 trf7970a_shutdown(trf);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002170err_free_ddev:
Mark A. Greer165063f2014-03-10 11:56:22 -07002171 nfc_digital_free_device(trf->ddev);
2172err_disable_regulator:
2173 regulator_disable(trf->regulator);
2174err_destroy_lock:
2175 mutex_destroy(&trf->lock);
2176 return ret;
2177}
2178
2179static int trf7970a_remove(struct spi_device *spi)
2180{
2181 struct trf7970a *trf = spi_get_drvdata(spi);
2182
2183 mutex_lock(&trf->lock);
2184
Mark A. Greerb5282812014-09-02 15:12:36 -07002185 trf7970a_shutdown(trf);
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002186
2187 mutex_unlock(&trf->lock);
Mark A. Greere6403b72014-03-25 08:54:38 -07002188
Mark A. Greer165063f2014-03-10 11:56:22 -07002189 nfc_digital_unregister_device(trf->ddev);
2190 nfc_digital_free_device(trf->ddev);
2191
2192 regulator_disable(trf->regulator);
2193
2194 mutex_destroy(&trf->lock);
2195
2196 return 0;
2197}
2198
Mark A. Greer77c95392014-09-02 15:12:37 -07002199#ifdef CONFIG_PM_SLEEP
2200static int trf7970a_suspend(struct device *dev)
2201{
Geliang Tang88e2ce02015-12-23 00:18:42 +08002202 struct spi_device *spi = to_spi_device(dev);
Mark A. Greer77c95392014-09-02 15:12:37 -07002203 struct trf7970a *trf = spi_get_drvdata(spi);
Mark A. Greer77c95392014-09-02 15:12:37 -07002204
2205 dev_dbg(dev, "Suspend\n");
2206
2207 mutex_lock(&trf->lock);
2208
2209 trf7970a_shutdown(trf);
2210
2211 mutex_unlock(&trf->lock);
2212
Mark A. Greer671970f2014-09-23 11:25:45 -07002213 return 0;
Mark A. Greer77c95392014-09-02 15:12:37 -07002214}
2215
2216static int trf7970a_resume(struct device *dev)
2217{
Geliang Tang88e2ce02015-12-23 00:18:42 +08002218 struct spi_device *spi = to_spi_device(dev);
Mark A. Greer77c95392014-09-02 15:12:37 -07002219 struct trf7970a *trf = spi_get_drvdata(spi);
Mark A. Greer55ef2e72014-09-23 11:25:46 -07002220 int ret;
Mark A. Greer77c95392014-09-02 15:12:37 -07002221
2222 dev_dbg(dev, "Resume\n");
2223
2224 mutex_lock(&trf->lock);
2225
2226 ret = trf7970a_startup(trf);
2227
2228 mutex_unlock(&trf->lock);
2229
2230 return ret;
2231}
2232#endif
2233
Rafael J. Wysockie8a92352014-12-14 23:14:36 +01002234#ifdef CONFIG_PM
Mark A. Greere6403b72014-03-25 08:54:38 -07002235static int trf7970a_pm_runtime_suspend(struct device *dev)
2236{
Geliang Tang88e2ce02015-12-23 00:18:42 +08002237 struct spi_device *spi = to_spi_device(dev);
Mark A. Greere6403b72014-03-25 08:54:38 -07002238 struct trf7970a *trf = spi_get_drvdata(spi);
2239 int ret;
2240
2241 dev_dbg(dev, "Runtime suspend\n");
2242
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002243 mutex_lock(&trf->lock);
Mark A. Greere6403b72014-03-25 08:54:38 -07002244
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002245 ret = trf7970a_power_down(trf);
Mark A. Greere6403b72014-03-25 08:54:38 -07002246
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002247 mutex_unlock(&trf->lock);
Mark A. Greere6403b72014-03-25 08:54:38 -07002248
2249 return ret;
2250}
2251
2252static int trf7970a_pm_runtime_resume(struct device *dev)
2253{
Geliang Tang88e2ce02015-12-23 00:18:42 +08002254 struct spi_device *spi = to_spi_device(dev);
Mark A. Greere6403b72014-03-25 08:54:38 -07002255 struct trf7970a *trf = spi_get_drvdata(spi);
2256 int ret;
2257
2258 dev_dbg(dev, "Runtime resume\n");
2259
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002260 ret = trf7970a_power_up(trf);
2261 if (!ret)
2262 pm_runtime_mark_last_busy(dev);
Mark A. Greere6403b72014-03-25 08:54:38 -07002263
Mark A. Greerceccd6a2014-09-02 15:12:35 -07002264 return ret;
Mark A. Greere6403b72014-03-25 08:54:38 -07002265}
2266#endif
2267
2268static const struct dev_pm_ops trf7970a_pm_ops = {
Mark A. Greer77c95392014-09-02 15:12:37 -07002269 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
Mark A. Greere6403b72014-03-25 08:54:38 -07002270 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
2271 trf7970a_pm_runtime_resume, NULL)
2272};
2273
Javier Martinez Canillas3c39c1a2015-09-16 11:08:42 +02002274static const struct of_device_id trf7970a_of_match[] = {
2275 { .compatible = "ti,trf7970a", },
2276 { /* sentinel */ },
2277};
2278MODULE_DEVICE_TABLE(of, trf7970a_of_match);
2279
Mark A. Greer165063f2014-03-10 11:56:22 -07002280static const struct spi_device_id trf7970a_id_table[] = {
Mark A. Greer772079e2014-08-07 17:41:43 -07002281 { "trf7970a", 0 },
Mark A. Greer165063f2014-03-10 11:56:22 -07002282 { }
2283};
2284MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
2285
2286static struct spi_driver trf7970a_spi_driver = {
2287 .probe = trf7970a_probe,
2288 .remove = trf7970a_remove,
2289 .id_table = trf7970a_id_table,
2290 .driver = {
2291 .name = "trf7970a",
Javier Martinez Canillas3c39c1a2015-09-16 11:08:42 +02002292 .of_match_table = of_match_ptr(trf7970a_of_match),
Mark A. Greere6403b72014-03-25 08:54:38 -07002293 .pm = &trf7970a_pm_ops,
Mark A. Greer165063f2014-03-10 11:56:22 -07002294 },
2295};
2296
2297module_spi_driver(trf7970a_spi_driver);
2298
2299MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
2300MODULE_LICENSE("GPL v2");
2301MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");