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NFC: trf7970a: fix check of clock frequencies, use && instead of ||
[mirror_ubuntu-bionic-kernel.git] / drivers / nfc / trf7970a.c
1 /*
2 * TI TRF7970a RFID/NFC Transceiver Driver
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Author: Erick Macias <emacias@ti.com>
7 * Author: Felipe Balbi <balbi@ti.com>
8 * Author: Mark A. Greer <mgreer@animalcreek.com>
9 *
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 of
12 * the License as published by the Free Software Foundation.
13 */
14
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/netdevice.h>
18 #include <linux/interrupt.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/nfc.h>
21 #include <linux/skbuff.h>
22 #include <linux/delay.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/of.h>
25 #include <linux/spi/spi.h>
26 #include <linux/regulator/consumer.h>
27
28 #include <net/nfc/nfc.h>
29 #include <net/nfc/digital.h>
30
31 /* There are 3 ways the host can communicate with the trf7970a:
32 * parallel mode, SPI with Slave Select (SS) mode, and SPI without
33 * SS mode. The driver only supports the two SPI modes.
34 *
35 * The trf7970a is very timing sensitive and the VIN, EN2, and EN
36 * pins must asserted in that order and with specific delays in between.
37 * The delays used in the driver were provided by TI and have been
38 * confirmed to work with this driver. There is a bug with the current
39 * version of the trf7970a that requires that EN2 remain low no matter
40 * what. If it goes high, it will generate an RF field even when in
41 * passive target mode. TI has indicated that the chip will work okay
42 * when EN2 is left low. The 'en2-rf-quirk' device tree property
43 * indicates that trf7970a currently being used has the erratum and
44 * that EN2 must be kept low.
45 *
46 * Timeouts are implemented using the delayed workqueue kernel facility.
47 * Timeouts are required so things don't hang when there is no response
48 * from the trf7970a (or tag). Using this mechanism creates a race with
49 * interrupts, however. That is, an interrupt and a timeout could occur
50 * closely enough together that one is blocked by the mutex while the other
51 * executes. When the timeout handler executes first and blocks the
52 * interrupt handler, it will eventually set the state to IDLE so the
53 * interrupt handler will check the state and exit with no harm done.
54 * When the interrupt handler executes first and blocks the timeout handler,
55 * the cancel_delayed_work() call will know that it didn't cancel the
56 * work item (i.e., timeout) and will return zero. That return code is
57 * used by the timer handler to indicate that it should ignore the timeout
58 * once its unblocked.
59 *
60 * Aborting an active command isn't as simple as it seems because the only
61 * way to abort a command that's already been sent to the tag is so turn
62 * off power to the tag. If we do that, though, we'd have to go through
63 * the entire anticollision procedure again but the digital layer doesn't
64 * support that. So, if an abort is received before trf7970a_send_cmd()
65 * has sent the command to the tag, it simply returns -ECANCELED. If the
66 * command has already been sent to the tag, then the driver continues
67 * normally and recieves the response data (or error) but just before
68 * sending the data upstream, it frees the rx_skb and sends -ECANCELED
69 * upstream instead. If the command failed, that error will be sent
70 * upstream.
71 *
72 * When recieving data from a tag and the interrupt status register has
73 * only the SRX bit set, it means that all of the data has been received
74 * (once what's in the fifo has been read). However, depending on timing
75 * an interrupt status with only the SRX bit set may not be recived. In
76 * those cases, the timeout mechanism is used to wait 20 ms in case more
77 * data arrives. After 20 ms, it is assumed that all of the data has been
78 * received and the accumulated rx data is sent upstream. The
79 * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose
80 * (i.e., it indicates that some data has been received but we're not sure
81 * if there is more coming so a timeout in this state means all data has
82 * been received and there isn't an error). The delay is 20 ms since delays
83 * of ~16 ms have been observed during testing.
84 *
85 * When transmitting a frame larger than the FIFO size (127 bytes), the
86 * driver will wait 20 ms for the FIFO to drain past the low-watermark
87 * and generate an interrupt. The low-watermark set to 32 bytes so the
88 * interrupt should fire after 127 - 32 = 95 bytes have been sent. At
89 * the lowest possible bit rate (6.62 kbps for 15693), it will take up
90 * to ~14.35 ms so 20 ms is used for the timeout.
91 *
92 * Type 2 write and sector select commands respond with a 4-bit ACK or NACK.
93 * Having only 4 bits in the FIFO won't normally generate an interrupt so
94 * driver enables the '4_bit_RX' bit of the Special Functions register 1
95 * to cause an interrupt in that case. Leaving that bit for a read command
96 * messes up the data returned so it is only enabled when the framing is
97 * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command.
98 * Unfortunately, that means that the driver has to peek into tx frames
99 * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by
100 * the trf7970a_per_cmd_config() routine.
101 *
102 * ISO/IEC 15693 frames specify whether to use single or double sub-carrier
103 * frequencies and whether to use low or high data rates in the flags byte
104 * of the frame. This means that the driver has to peek at all 15693 frames
105 * to determine what speed to set the communication to. In addition, write
106 * and lock commands use the OPTION flag to indicate that an EOF must be
107 * sent to the tag before it will send its response. So the driver has to
108 * examine all frames for that reason too.
109 *
110 * It is unclear how long to wait before sending the EOF. According to the
111 * Note under Table 1-1 in section 1.6 of
112 * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least
113 * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long
114 * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain
115 * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to
116 * ensure the wait is long enough before sending the EOF. This seems to work
117 * reliably.
118 */
119
120 #define TRF7970A_SUPPORTED_PROTOCOLS \
121 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \
122 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \
123 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK)
124
125 #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */
126 #define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000
127 #define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000
128
129 #define TRF7970A_RX_SKB_ALLOC_SIZE 256
130
131 #define TRF7970A_FIFO_SIZE 127
132
133 /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */
134 #define TRF7970A_TX_MAX (4096 - 1)
135
136 #define TRF7970A_WAIT_FOR_TX_IRQ 20
137 #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20
138 #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20
139 #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40
140
141 /* Guard times for various RF technologies (in us) */
142 #define TRF7970A_GUARD_TIME_NFCA 5000
143 #define TRF7970A_GUARD_TIME_NFCB 5000
144 #define TRF7970A_GUARD_TIME_NFCF 20000
145 #define TRF7970A_GUARD_TIME_15693 1000
146
147 /* Quirks */
148 /* Erratum: When reading IRQ Status register on trf7970a, we must issue a
149 * read continuous command for IRQ Status and Collision Position registers.
150 */
151 #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0)
152 #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1)
153 #define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2)
154
155 /* Direct commands */
156 #define TRF7970A_CMD_IDLE 0x00
157 #define TRF7970A_CMD_SOFT_INIT 0x03
158 #define TRF7970A_CMD_RF_COLLISION 0x04
159 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05
160 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06
161 #define TRF7970A_CMD_FIFO_RESET 0x0f
162 #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10
163 #define TRF7970A_CMD_TRANSMIT 0x11
164 #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12
165 #define TRF7970A_CMD_DELAY_TRANSMIT 0x13
166 #define TRF7970A_CMD_EOF 0x14
167 #define TRF7970A_CMD_CLOSE_SLOT 0x15
168 #define TRF7970A_CMD_BLOCK_RX 0x16
169 #define TRF7970A_CMD_ENABLE_RX 0x17
170 #define TRF7970A_CMD_TEST_INT_RF 0x18
171 #define TRF7970A_CMD_TEST_EXT_RF 0x19
172 #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a
173
174 /* Bits determining whether its a direct command or register R/W,
175 * whether to use a continuous SPI transaction or not, and the actual
176 * direct cmd opcode or regster address.
177 */
178 #define TRF7970A_CMD_BIT_CTRL BIT(7)
179 #define TRF7970A_CMD_BIT_RW BIT(6)
180 #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5)
181 #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f)
182
183 /* Registers addresses */
184 #define TRF7970A_CHIP_STATUS_CTRL 0x00
185 #define TRF7970A_ISO_CTRL 0x01
186 #define TRF7970A_ISO14443B_TX_OPTIONS 0x02
187 #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03
188 #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04
189 #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05
190 #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06
191 #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07
192 #define TRF7970A_RX_WAIT_TIME 0x08
193 #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09
194 #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a
195 #define TRF7970A_REG_IO_CTRL 0x0b
196 #define TRF7970A_IRQ_STATUS 0x0c
197 #define TRF7970A_COLLISION_IRQ_MASK 0x0d
198 #define TRF7970A_COLLISION_POSITION 0x0e
199 #define TRF7970A_RSSI_OSC_STATUS 0x0f
200 #define TRF7970A_SPECIAL_FCN_REG1 0x10
201 #define TRF7970A_SPECIAL_FCN_REG2 0x11
202 #define TRF7970A_RAM1 0x12
203 #define TRF7970A_RAM2 0x13
204 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14
205 #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16
206 #define TRF7970A_NFCID1 0x17
207 #define TRF7970A_NFC_TARGET_LEVEL 0x18
208 #define TRF79070A_NFC_TARGET_PROTOCOL 0x19
209 #define TRF7970A_TEST_REGISTER1 0x1a
210 #define TRF7970A_TEST_REGISTER2 0x1b
211 #define TRF7970A_FIFO_STATUS 0x1c
212 #define TRF7970A_TX_LENGTH_BYTE1 0x1d
213 #define TRF7970A_TX_LENGTH_BYTE2 0x1e
214 #define TRF7970A_FIFO_IO_REGISTER 0x1f
215
216 /* Chip Status Control Register Bits */
217 #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0)
218 #define TRF7970A_CHIP_STATUS_REC_ON BIT(1)
219 #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2)
220 #define TRF7970A_CHIP_STATUS_PM_ON BIT(3)
221 #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4)
222 #define TRF7970A_CHIP_STATUS_RF_ON BIT(5)
223 #define TRF7970A_CHIP_STATUS_DIRECT BIT(6)
224 #define TRF7970A_CHIP_STATUS_STBY BIT(7)
225
226 /* ISO Control Register Bits */
227 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00
228 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01
229 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02
230 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03
231 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04
232 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05
233 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06
234 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07
235 #define TRF7970A_ISO_CTRL_14443A_106 0x08
236 #define TRF7970A_ISO_CTRL_14443A_212 0x09
237 #define TRF7970A_ISO_CTRL_14443A_424 0x0a
238 #define TRF7970A_ISO_CTRL_14443A_848 0x0b
239 #define TRF7970A_ISO_CTRL_14443B_106 0x0c
240 #define TRF7970A_ISO_CTRL_14443B_212 0x0d
241 #define TRF7970A_ISO_CTRL_14443B_424 0x0e
242 #define TRF7970A_ISO_CTRL_14443B_848 0x0f
243 #define TRF7970A_ISO_CTRL_FELICA_212 0x1a
244 #define TRF7970A_ISO_CTRL_FELICA_424 0x1b
245 #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01
246 #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02
247 #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03
248 #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00
249 #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01
250 #define TRF7970A_ISO_CTRL_NFC_CE BIT(2)
251 #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3)
252 #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4)
253 #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5)
254 #define TRF7970A_ISO_CTRL_RFID BIT(5)
255 #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6)
256 #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */
257
258 #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f
259
260 /* Modulator and SYS_CLK Control Register Bits */
261 #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7)
262 #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0))
263 #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1))
264 #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2))
265 #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3))
266 #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4))
267 #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5))
268 #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6))
269 #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7))
270 #define TRF7970A_MODULATOR_EN_ANA BIT(3)
271 #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4)
272 #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0))
273 #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1))
274 #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2))
275 #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3))
276 #define TRF7970A_MODULATOR_EN_OOK BIT(6)
277 #define TRF7970A_MODULATOR_27MHZ BIT(7)
278
279 #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0)
280 #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1)
281 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2)
282 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2)
283 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2)
284 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2)
285 #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4)
286 #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5)
287 #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6)
288 #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7)
289
290 #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07)
291 #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5)
292 #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6)
293 #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7)
294
295 /* IRQ Status Register Bits */
296 #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */
297 #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0)
298 #define TRF7970A_IRQ_STATUS_COL BIT(1)
299 #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2)
300 #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2)
301 #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3)
302 #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3)
303 #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4)
304 #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4)
305 #define TRF7970A_IRQ_STATUS_FIFO BIT(5)
306 #define TRF7970A_IRQ_STATUS_SRX BIT(6)
307 #define TRF7970A_IRQ_STATUS_TX BIT(7)
308
309 #define TRF7970A_IRQ_STATUS_ERROR \
310 (TRF7970A_IRQ_STATUS_COL | \
311 TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \
312 TRF7970A_IRQ_STATUS_PARITY_ERROR | \
313 TRF7970A_IRQ_STATUS_CRC_ERROR)
314
315 #define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0))
316 #define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3))
317 #define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6)
318
319 #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0)
320 #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1)
321 #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2)
322 #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3)
323 #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4)
324 #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5)
325
326 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2)
327 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2)
328 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2)
329 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2)
330 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0
331 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1
332 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2
333 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3
334
335 #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07)
336 #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7)
337
338 #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07)
339 #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3)
340 #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5)
341 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6)
342 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6)
343 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6)
344
345 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0)
346 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1)
347 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1))
348 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2)
349 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3)
350 #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4)
351 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6)
352 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7)
353
354 #define TRF79070A_NFC_TARGET_PROTOCOL_106A \
355 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
356 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
357 TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \
358 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
359
360 #define TRF79070A_NFC_TARGET_PROTOCOL_106B \
361 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
362 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
363 TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \
364 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
365
366 #define TRF79070A_NFC_TARGET_PROTOCOL_212F \
367 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
368 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
369 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
370 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212)
371
372 #define TRF79070A_NFC_TARGET_PROTOCOL_424F \
373 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
374 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
375 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
376 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424)
377
378 #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7)
379
380 /* NFC (ISO/IEC 14443A) Type 2 Tag commands */
381 #define NFC_T2T_CMD_READ 0x30
382
383 /* ISO 15693 commands codes */
384 #define ISO15693_CMD_INVENTORY 0x01
385 #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20
386 #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21
387 #define ISO15693_CMD_LOCK_BLOCK 0x22
388 #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23
389 #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24
390 #define ISO15693_CMD_SELECT 0x25
391 #define ISO15693_CMD_RESET_TO_READY 0x26
392 #define ISO15693_CMD_WRITE_AFI 0x27
393 #define ISO15693_CMD_LOCK_AFI 0x28
394 #define ISO15693_CMD_WRITE_DSFID 0x29
395 #define ISO15693_CMD_LOCK_DSFID 0x2a
396 #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b
397 #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c
398
399 /* ISO 15693 request and response flags */
400 #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0)
401 #define ISO15693_REQ_FLAG_DATA_RATE BIT(1)
402 #define ISO15693_REQ_FLAG_INVENTORY BIT(2)
403 #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3)
404 #define ISO15693_REQ_FLAG_SELECT BIT(4)
405 #define ISO15693_REQ_FLAG_AFI BIT(4)
406 #define ISO15693_REQ_FLAG_ADDRESS BIT(5)
407 #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5)
408 #define ISO15693_REQ_FLAG_OPTION BIT(6)
409
410 #define ISO15693_REQ_FLAG_SPEED_MASK \
411 (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE)
412
413 enum trf7970a_state {
414 TRF7970A_ST_PWR_OFF,
415 TRF7970A_ST_RF_OFF,
416 TRF7970A_ST_IDLE,
417 TRF7970A_ST_IDLE_RX_BLOCKED,
418 TRF7970A_ST_WAIT_FOR_TX_FIFO,
419 TRF7970A_ST_WAIT_FOR_RX_DATA,
420 TRF7970A_ST_WAIT_FOR_RX_DATA_CONT,
421 TRF7970A_ST_WAIT_TO_ISSUE_EOF,
422 TRF7970A_ST_LISTENING,
423 TRF7970A_ST_LISTENING_MD,
424 TRF7970A_ST_MAX
425 };
426
427 struct trf7970a {
428 enum trf7970a_state state;
429 struct device *dev;
430 struct spi_device *spi;
431 struct regulator *regulator;
432 struct nfc_digital_dev *ddev;
433 u32 quirks;
434 bool is_initiator;
435 bool aborting;
436 struct sk_buff *tx_skb;
437 struct sk_buff *rx_skb;
438 nfc_digital_cmd_complete_t cb;
439 void *cb_arg;
440 u8 chip_status_ctrl;
441 u8 iso_ctrl;
442 u8 iso_ctrl_tech;
443 u8 modulator_sys_clk_ctrl;
444 u8 special_fcn_reg1;
445 u8 io_ctrl;
446 unsigned int guard_time;
447 int technology;
448 int framing;
449 u8 md_rf_tech;
450 u8 tx_cmd;
451 bool issue_eof;
452 bool adjust_resp_len;
453 struct gpio_desc *en_gpiod;
454 struct gpio_desc *en2_gpiod;
455 struct mutex lock;
456 unsigned int timeout;
457 bool ignore_timeout;
458 struct delayed_work timeout_work;
459 };
460
461 static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)
462 {
463 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode);
464 int ret;
465
466 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd);
467
468 ret = spi_write(trf->spi, &cmd, 1);
469 if (ret)
470 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd,
471 ret);
472 return ret;
473 }
474
475 static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)
476 {
477 u8 addr = TRF7970A_CMD_BIT_RW | reg;
478 int ret;
479
480 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1);
481 if (ret)
482 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
483 ret);
484
485 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val);
486
487 return ret;
488 }
489
490 static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf,
491 size_t len)
492 {
493 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
494 struct spi_transfer t[2];
495 struct spi_message m;
496 int ret;
497
498 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
499
500 spi_message_init(&m);
501
502 memset(&t, 0, sizeof(t));
503
504 t[0].tx_buf = &addr;
505 t[0].len = sizeof(addr);
506 spi_message_add_tail(&t[0], &m);
507
508 t[1].rx_buf = buf;
509 t[1].len = len;
510 spi_message_add_tail(&t[1], &m);
511
512 ret = spi_sync(trf->spi, &m);
513 if (ret)
514 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
515 ret);
516 return ret;
517 }
518
519 static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)
520 {
521 u8 buf[2] = { reg, val };
522 int ret;
523
524 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val);
525
526 ret = spi_write(trf->spi, buf, 2);
527 if (ret)
528 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__,
529 buf[0], buf[1], ret);
530
531 return ret;
532 }
533
534 static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)
535 {
536 int ret;
537 u8 buf[2];
538 u8 addr;
539
540 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW;
541
542 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) {
543 addr |= TRF7970A_CMD_BIT_CONTINUOUS;
544 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
545 } else {
546 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1);
547 }
548
549 if (ret)
550 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n",
551 __func__, ret);
552 else
553 *status = buf[0];
554
555 return ret;
556 }
557
558 static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto)
559 {
560 int ret;
561 u8 buf[2];
562 u8 addr;
563
564 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW |
565 TRF7970A_CMD_BIT_CONTINUOUS;
566
567 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
568 if (ret)
569 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n",
570 __func__, ret);
571 else
572 *target_proto = buf[0];
573
574 return ret;
575 }
576
577 static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech)
578 {
579 int ret;
580 u8 target_proto, tech;
581
582 ret = trf7970a_read_target_proto(trf, &target_proto);
583 if (ret)
584 return ret;
585
586 switch (target_proto) {
587 case TRF79070A_NFC_TARGET_PROTOCOL_106A:
588 tech = NFC_DIGITAL_RF_TECH_106A;
589 break;
590 case TRF79070A_NFC_TARGET_PROTOCOL_106B:
591 tech = NFC_DIGITAL_RF_TECH_106B;
592 break;
593 case TRF79070A_NFC_TARGET_PROTOCOL_212F:
594 tech = NFC_DIGITAL_RF_TECH_212F;
595 break;
596 case TRF79070A_NFC_TARGET_PROTOCOL_424F:
597 tech = NFC_DIGITAL_RF_TECH_424F;
598 break;
599 default:
600 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n",
601 __func__, target_proto);
602 return -EIO;
603 }
604
605 *rf_tech = tech;
606
607 return ret;
608 }
609
610 static void trf7970a_send_upstream(struct trf7970a *trf)
611 {
612 dev_kfree_skb_any(trf->tx_skb);
613 trf->tx_skb = NULL;
614
615 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting)
616 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE,
617 16, 1, trf->rx_skb->data, trf->rx_skb->len,
618 false);
619
620 trf->state = TRF7970A_ST_IDLE;
621
622 if (trf->aborting) {
623 dev_dbg(trf->dev, "Abort process complete\n");
624
625 if (!IS_ERR(trf->rx_skb)) {
626 kfree_skb(trf->rx_skb);
627 trf->rx_skb = ERR_PTR(-ECANCELED);
628 }
629
630 trf->aborting = false;
631 }
632
633 if (trf->adjust_resp_len) {
634 if (trf->rx_skb)
635 skb_trim(trf->rx_skb, trf->rx_skb->len - 1);
636
637 trf->adjust_resp_len = false;
638 }
639
640 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
641
642 trf->rx_skb = NULL;
643 }
644
645 static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)
646 {
647 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno);
648
649 cancel_delayed_work(&trf->timeout_work);
650
651 kfree_skb(trf->rx_skb);
652 trf->rx_skb = ERR_PTR(errno);
653
654 trf7970a_send_upstream(trf);
655 }
656
657 static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
658 unsigned int len, u8 *prefix,
659 unsigned int prefix_len)
660 {
661 struct spi_transfer t[2];
662 struct spi_message m;
663 unsigned int timeout;
664 int ret;
665
666 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE,
667 16, 1, skb->data, len, false);
668
669 spi_message_init(&m);
670
671 memset(&t, 0, sizeof(t));
672
673 t[0].tx_buf = prefix;
674 t[0].len = prefix_len;
675 spi_message_add_tail(&t[0], &m);
676
677 t[1].tx_buf = skb->data;
678 t[1].len = len;
679 spi_message_add_tail(&t[1], &m);
680
681 ret = spi_sync(trf->spi, &m);
682 if (ret) {
683 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__,
684 ret);
685 return ret;
686 }
687
688 skb_pull(skb, len);
689
690 if (skb->len > 0) {
691 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO;
692 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT;
693 } else {
694 if (trf->issue_eof) {
695 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF;
696 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF;
697 } else {
698 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
699
700 if (!trf->timeout)
701 timeout = TRF7970A_WAIT_FOR_TX_IRQ;
702 else
703 timeout = trf->timeout;
704 }
705 }
706
707 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout,
708 trf->state);
709
710 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
711
712 return 0;
713 }
714
715 static void trf7970a_fill_fifo(struct trf7970a *trf)
716 {
717 struct sk_buff *skb = trf->tx_skb;
718 unsigned int len;
719 int ret;
720 u8 fifo_bytes;
721 u8 prefix;
722
723 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
724 if (ret) {
725 trf7970a_send_err_upstream(trf, ret);
726 return;
727 }
728
729 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
730
731 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
732
733 /* Calculate how much more data can be written to the fifo */
734 len = TRF7970A_FIFO_SIZE - fifo_bytes;
735 if (!len) {
736 schedule_delayed_work(&trf->timeout_work,
737 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
738 return;
739 }
740
741 len = min(skb->len, len);
742
743 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER;
744
745 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix));
746 if (ret)
747 trf7970a_send_err_upstream(trf, ret);
748 }
749
750 static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)
751 {
752 struct sk_buff *skb = trf->rx_skb;
753 int ret;
754 u8 fifo_bytes;
755
756 if (status & TRF7970A_IRQ_STATUS_ERROR) {
757 trf7970a_send_err_upstream(trf, -EIO);
758 return;
759 }
760
761 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
762 if (ret) {
763 trf7970a_send_err_upstream(trf, ret);
764 return;
765 }
766
767 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
768
769 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
770
771 if (!fifo_bytes)
772 goto no_rx_data;
773
774 if (fifo_bytes > skb_tailroom(skb)) {
775 skb = skb_copy_expand(skb, skb_headroom(skb),
776 max_t(int, fifo_bytes,
777 TRF7970A_RX_SKB_ALLOC_SIZE),
778 GFP_KERNEL);
779 if (!skb) {
780 trf7970a_send_err_upstream(trf, -ENOMEM);
781 return;
782 }
783
784 kfree_skb(trf->rx_skb);
785 trf->rx_skb = skb;
786 }
787
788 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,
789 skb_put(skb, fifo_bytes), fifo_bytes);
790 if (ret) {
791 trf7970a_send_err_upstream(trf, ret);
792 return;
793 }
794
795 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */
796 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) &&
797 (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {
798 skb->data[0] >>= 4;
799 status = TRF7970A_IRQ_STATUS_SRX;
800 } else {
801 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT;
802
803 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
804 if (ret) {
805 trf7970a_send_err_upstream(trf, ret);
806 return;
807 }
808
809 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
810
811 /* If there are bytes in the FIFO, set status to '0' so
812 * the if stmt below doesn't fire and the driver will wait
813 * for the trf7970a to generate another RX interrupt.
814 */
815 if (fifo_bytes)
816 status = 0;
817 }
818
819 no_rx_data:
820 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */
821 trf7970a_send_upstream(trf);
822 return;
823 }
824
825 dev_dbg(trf->dev, "Setting timeout for %d ms\n",
826 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT);
827
828 schedule_delayed_work(&trf->timeout_work,
829 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT));
830 }
831
832 static irqreturn_t trf7970a_irq(int irq, void *dev_id)
833 {
834 struct trf7970a *trf = dev_id;
835 int ret;
836 u8 status, fifo_bytes, iso_ctrl;
837
838 mutex_lock(&trf->lock);
839
840 if (trf->state == TRF7970A_ST_RF_OFF) {
841 mutex_unlock(&trf->lock);
842 return IRQ_NONE;
843 }
844
845 ret = trf7970a_read_irqstatus(trf, &status);
846 if (ret) {
847 mutex_unlock(&trf->lock);
848 return IRQ_NONE;
849 }
850
851 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state,
852 status);
853
854 if (!status) {
855 mutex_unlock(&trf->lock);
856 return IRQ_NONE;
857 }
858
859 switch (trf->state) {
860 case TRF7970A_ST_IDLE:
861 case TRF7970A_ST_IDLE_RX_BLOCKED:
862 /* If initiator and getting interrupts caused by RF noise,
863 * turn off the receiver to avoid unnecessary interrupts.
864 * It will be turned back on in trf7970a_send_cmd() when
865 * the next command is issued.
866 */
867 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) {
868 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);
869 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED;
870 }
871
872 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
873 break;
874 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
875 if (status & TRF7970A_IRQ_STATUS_TX) {
876 trf->ignore_timeout =
877 !cancel_delayed_work(&trf->timeout_work);
878 trf7970a_fill_fifo(trf);
879 } else {
880 trf7970a_send_err_upstream(trf, -EIO);
881 }
882 break;
883 case TRF7970A_ST_WAIT_FOR_RX_DATA:
884 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
885 if (status & TRF7970A_IRQ_STATUS_SRX) {
886 trf->ignore_timeout =
887 !cancel_delayed_work(&trf->timeout_work);
888 trf7970a_drain_fifo(trf, status);
889 } else if (status & TRF7970A_IRQ_STATUS_FIFO) {
890 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,
891 &fifo_bytes);
892
893 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
894
895 if (ret)
896 trf7970a_send_err_upstream(trf, ret);
897 else if (!fifo_bytes)
898 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
899 } else if ((status == TRF7970A_IRQ_STATUS_TX) ||
900 (!trf->is_initiator &&
901 (status == (TRF7970A_IRQ_STATUS_TX |
902 TRF7970A_IRQ_STATUS_NFC_RF)))) {
903 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
904
905 if (!trf->timeout) {
906 trf->ignore_timeout =
907 !cancel_delayed_work(&trf->timeout_work);
908 trf->rx_skb = ERR_PTR(0);
909 trf7970a_send_upstream(trf);
910 break;
911 }
912
913 if (trf->is_initiator)
914 break;
915
916 iso_ctrl = trf->iso_ctrl;
917
918 switch (trf->framing) {
919 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
920 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
921 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
922 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
923 break;
924 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
925 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
926 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
927 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
928 break;
929 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
930 ret = trf7970a_write(trf,
931 TRF7970A_SPECIAL_FCN_REG1,
932 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL);
933 if (ret)
934 goto err_unlock_exit;
935
936 trf->special_fcn_reg1 =
937 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL;
938 break;
939 default:
940 break;
941 }
942
943 if (iso_ctrl != trf->iso_ctrl) {
944 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
945 iso_ctrl);
946 if (ret)
947 goto err_unlock_exit;
948
949 trf->iso_ctrl = iso_ctrl;
950 }
951 } else {
952 trf7970a_send_err_upstream(trf, -EIO);
953 }
954 break;
955 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
956 if (status != TRF7970A_IRQ_STATUS_TX)
957 trf7970a_send_err_upstream(trf, -EIO);
958 break;
959 case TRF7970A_ST_LISTENING:
960 if (status & TRF7970A_IRQ_STATUS_SRX) {
961 trf->ignore_timeout =
962 !cancel_delayed_work(&trf->timeout_work);
963 trf7970a_drain_fifo(trf, status);
964 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
965 trf7970a_send_err_upstream(trf, -EIO);
966 }
967 break;
968 case TRF7970A_ST_LISTENING_MD:
969 if (status & TRF7970A_IRQ_STATUS_SRX) {
970 trf->ignore_timeout =
971 !cancel_delayed_work(&trf->timeout_work);
972
973 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech);
974 if (ret) {
975 trf7970a_send_err_upstream(trf, ret);
976 } else {
977 trf->state = TRF7970A_ST_LISTENING;
978 trf7970a_drain_fifo(trf, status);
979 }
980 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
981 trf7970a_send_err_upstream(trf, -EIO);
982 }
983 break;
984 default:
985 dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
986 __func__, trf->state);
987 }
988
989 err_unlock_exit:
990 mutex_unlock(&trf->lock);
991 return IRQ_HANDLED;
992 }
993
994 static void trf7970a_issue_eof(struct trf7970a *trf)
995 {
996 int ret;
997
998 dev_dbg(trf->dev, "Issuing EOF\n");
999
1000 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
1001 if (ret)
1002 trf7970a_send_err_upstream(trf, ret);
1003
1004 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
1005 if (ret)
1006 trf7970a_send_err_upstream(trf, ret);
1007
1008 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
1009
1010 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n",
1011 trf->timeout, trf->state);
1012
1013 schedule_delayed_work(&trf->timeout_work,
1014 msecs_to_jiffies(trf->timeout));
1015 }
1016
1017 static void trf7970a_timeout_work_handler(struct work_struct *work)
1018 {
1019 struct trf7970a *trf = container_of(work, struct trf7970a,
1020 timeout_work.work);
1021
1022 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n",
1023 trf->state, trf->ignore_timeout);
1024
1025 mutex_lock(&trf->lock);
1026
1027 if (trf->ignore_timeout)
1028 trf->ignore_timeout = false;
1029 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)
1030 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);
1031 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
1032 trf7970a_issue_eof(trf);
1033 else
1034 trf7970a_send_err_upstream(trf, -ETIMEDOUT);
1035
1036 mutex_unlock(&trf->lock);
1037 }
1038
1039 static int trf7970a_init(struct trf7970a *trf)
1040 {
1041 int ret;
1042
1043 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state);
1044
1045 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);
1046 if (ret)
1047 goto err_out;
1048
1049 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);
1050 if (ret)
1051 goto err_out;
1052
1053 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
1054 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));
1055 if (ret)
1056 goto err_out;
1057
1058 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1059 if (ret)
1060 goto err_out;
1061
1062 usleep_range(1000, 2000);
1063
1064 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1065
1066 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1067 trf->modulator_sys_clk_ctrl);
1068 if (ret)
1069 goto err_out;
1070
1071 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,
1072 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |
1073 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32);
1074 if (ret)
1075 goto err_out;
1076
1077 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);
1078 if (ret)
1079 goto err_out;
1080
1081 trf->special_fcn_reg1 = 0;
1082
1083 trf->iso_ctrl = 0xff;
1084 return 0;
1085
1086 err_out:
1087 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
1088 return ret;
1089 }
1090
1091 static void trf7970a_switch_rf_off(struct trf7970a *trf)
1092 {
1093 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1094 (trf->state == TRF7970A_ST_RF_OFF))
1095 return;
1096
1097 dev_dbg(trf->dev, "Switching rf off\n");
1098
1099 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1100
1101 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl);
1102
1103 trf->aborting = false;
1104 trf->state = TRF7970A_ST_RF_OFF;
1105
1106 pm_runtime_mark_last_busy(trf->dev);
1107 pm_runtime_put_autosuspend(trf->dev);
1108 }
1109
1110 static int trf7970a_switch_rf_on(struct trf7970a *trf)
1111 {
1112 int ret;
1113
1114 dev_dbg(trf->dev, "Switching rf on\n");
1115
1116 pm_runtime_get_sync(trf->dev);
1117
1118 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */
1119 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__,
1120 trf->state);
1121 return -EINVAL;
1122 }
1123
1124 ret = trf7970a_init(trf);
1125 if (ret) {
1126 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret);
1127 return ret;
1128 }
1129
1130 trf->state = TRF7970A_ST_IDLE;
1131
1132 return 0;
1133 }
1134
1135 static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
1136 {
1137 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1138 int ret = 0;
1139
1140 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on);
1141
1142 mutex_lock(&trf->lock);
1143
1144 if (on) {
1145 switch (trf->state) {
1146 case TRF7970A_ST_PWR_OFF:
1147 case TRF7970A_ST_RF_OFF:
1148 ret = trf7970a_switch_rf_on(trf);
1149 break;
1150 case TRF7970A_ST_IDLE:
1151 case TRF7970A_ST_IDLE_RX_BLOCKED:
1152 break;
1153 default:
1154 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1155 __func__, trf->state, on);
1156 trf7970a_switch_rf_off(trf);
1157 ret = -EINVAL;
1158 }
1159 } else {
1160 switch (trf->state) {
1161 case TRF7970A_ST_PWR_OFF:
1162 case TRF7970A_ST_RF_OFF:
1163 break;
1164 default:
1165 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1166 __func__, trf->state, on);
1167 ret = -EINVAL;
1168 /* FALLTHROUGH */
1169 case TRF7970A_ST_IDLE:
1170 case TRF7970A_ST_IDLE_RX_BLOCKED:
1171 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1172 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1173 trf7970a_switch_rf_off(trf);
1174 }
1175 }
1176
1177 mutex_unlock(&trf->lock);
1178 return ret;
1179 }
1180
1181 static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
1182 {
1183 int ret = 0;
1184
1185 dev_dbg(trf->dev, "rf technology: %d\n", tech);
1186
1187 switch (tech) {
1188 case NFC_DIGITAL_RF_TECH_106A:
1189 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
1190 trf->modulator_sys_clk_ctrl =
1191 (trf->modulator_sys_clk_ctrl & 0xf8) |
1192 TRF7970A_MODULATOR_DEPTH_OOK;
1193 trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
1194 break;
1195 case NFC_DIGITAL_RF_TECH_106B:
1196 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;
1197 trf->modulator_sys_clk_ctrl =
1198 (trf->modulator_sys_clk_ctrl & 0xf8) |
1199 TRF7970A_MODULATOR_DEPTH_ASK10;
1200 trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
1201 break;
1202 case NFC_DIGITAL_RF_TECH_212F:
1203 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;
1204 trf->modulator_sys_clk_ctrl =
1205 (trf->modulator_sys_clk_ctrl & 0xf8) |
1206 TRF7970A_MODULATOR_DEPTH_ASK10;
1207 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
1208 break;
1209 case NFC_DIGITAL_RF_TECH_424F:
1210 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;
1211 trf->modulator_sys_clk_ctrl =
1212 (trf->modulator_sys_clk_ctrl & 0xf8) |
1213 TRF7970A_MODULATOR_DEPTH_ASK10;
1214 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
1215 break;
1216 case NFC_DIGITAL_RF_TECH_ISO15693:
1217 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1218 trf->modulator_sys_clk_ctrl =
1219 (trf->modulator_sys_clk_ctrl & 0xf8) |
1220 TRF7970A_MODULATOR_DEPTH_OOK;
1221 trf->guard_time = TRF7970A_GUARD_TIME_15693;
1222 break;
1223 default:
1224 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1225 return -EINVAL;
1226 }
1227
1228 trf->technology = tech;
1229
1230 /* If in initiator mode and not changing the RF tech due to a
1231 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from
1232 * trf7970a_init()), clear the NFC Target Detection Level register
1233 * due to erratum.
1234 */
1235 if (trf->iso_ctrl == 0xff)
1236 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1237
1238 return ret;
1239 }
1240
1241 static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)
1242 {
1243 int ret;
1244 u8 rssi;
1245
1246 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1247 trf->chip_status_ctrl |
1248 TRF7970A_CHIP_STATUS_REC_ON);
1249 if (ret)
1250 return ret;
1251
1252 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);
1253 if (ret)
1254 return ret;
1255
1256 usleep_range(50, 60);
1257
1258 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi);
1259 if (ret)
1260 return ret;
1261
1262 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1263 trf->chip_status_ctrl);
1264 if (ret)
1265 return ret;
1266
1267 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK)
1268 *is_rf_field = true;
1269 else
1270 *is_rf_field = false;
1271
1272 return 0;
1273 }
1274
1275 static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)
1276 {
1277 u8 iso_ctrl = trf->iso_ctrl_tech;
1278 bool is_rf_field = false;
1279 int ret;
1280
1281 dev_dbg(trf->dev, "framing: %d\n", framing);
1282
1283 switch (framing) {
1284 case NFC_DIGITAL_FRAMING_NFCA_SHORT:
1285 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1286 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1287 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1288 break;
1289 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1290 case NFC_DIGITAL_FRAMING_NFCA_T4T:
1291 case NFC_DIGITAL_FRAMING_NFCB:
1292 case NFC_DIGITAL_FRAMING_NFCB_T4T:
1293 case NFC_DIGITAL_FRAMING_NFCF:
1294 case NFC_DIGITAL_FRAMING_NFCF_T3T:
1295 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
1296 case NFC_DIGITAL_FRAMING_ISO15693_T5T:
1297 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1298 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1299 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1300 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1301 break;
1302 case NFC_DIGITAL_FRAMING_NFCA_T2T:
1303 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1304 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1305 break;
1306 default:
1307 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1308 return -EINVAL;
1309 }
1310
1311 trf->framing = framing;
1312
1313 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1314 ret = trf7970a_is_rf_field(trf, &is_rf_field);
1315 if (ret)
1316 return ret;
1317
1318 if (is_rf_field)
1319 return -EBUSY;
1320 }
1321
1322 if (iso_ctrl != trf->iso_ctrl) {
1323 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1324 if (ret)
1325 return ret;
1326
1327 trf->iso_ctrl = iso_ctrl;
1328
1329 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1330 trf->modulator_sys_clk_ctrl);
1331 if (ret)
1332 return ret;
1333 }
1334
1335 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1336 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1337 trf->chip_status_ctrl |
1338 TRF7970A_CHIP_STATUS_RF_ON);
1339 if (ret)
1340 return ret;
1341
1342 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1343
1344 usleep_range(trf->guard_time, trf->guard_time + 1000);
1345 }
1346
1347 return 0;
1348 }
1349
1350 static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,
1351 int param)
1352 {
1353 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1354 int ret;
1355
1356 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1357
1358 mutex_lock(&trf->lock);
1359
1360 trf->is_initiator = true;
1361
1362 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1363 (trf->state == TRF7970A_ST_RF_OFF)) {
1364 ret = trf7970a_switch_rf_on(trf);
1365 if (ret)
1366 goto err_unlock;
1367 }
1368
1369 switch (type) {
1370 case NFC_DIGITAL_CONFIG_RF_TECH:
1371 ret = trf7970a_in_config_rf_tech(trf, param);
1372 break;
1373 case NFC_DIGITAL_CONFIG_FRAMING:
1374 ret = trf7970a_in_config_framing(trf, param);
1375 break;
1376 default:
1377 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1378 ret = -EINVAL;
1379 }
1380
1381 err_unlock:
1382 mutex_unlock(&trf->lock);
1383 return ret;
1384 }
1385
1386 static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
1387 {
1388 switch (cmd) {
1389 case ISO15693_CMD_WRITE_SINGLE_BLOCK:
1390 case ISO15693_CMD_LOCK_BLOCK:
1391 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK:
1392 case ISO15693_CMD_WRITE_AFI:
1393 case ISO15693_CMD_LOCK_AFI:
1394 case ISO15693_CMD_WRITE_DSFID:
1395 case ISO15693_CMD_LOCK_DSFID:
1396 return 1;
1397 break;
1398 default:
1399 return 0;
1400 }
1401 }
1402
1403 static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
1404 {
1405 u8 *req = skb->data;
1406 u8 special_fcn_reg1, iso_ctrl;
1407 int ret;
1408
1409 trf->issue_eof = false;
1410
1411 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in
1412 * special functions register 1 is cleared; otherwise, its a write or
1413 * sector select command and '4_bit_RX' must be set.
1414 *
1415 * When issuing an ISO 15693 command, inspect the flags byte to see
1416 * what speed to use. Also, remember if the OPTION flag is set on
1417 * a Type 5 write or lock command so the driver will know that it
1418 * has to send an EOF in order to get a response.
1419 */
1420 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) &&
1421 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {
1422 if (req[0] == NFC_T2T_CMD_READ)
1423 special_fcn_reg1 = 0;
1424 else
1425 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX;
1426
1427 if (special_fcn_reg1 != trf->special_fcn_reg1) {
1428 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,
1429 special_fcn_reg1);
1430 if (ret)
1431 return ret;
1432
1433 trf->special_fcn_reg1 = special_fcn_reg1;
1434 }
1435 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) {
1436 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;
1437
1438 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) {
1439 case 0x00:
1440 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662;
1441 break;
1442 case ISO15693_REQ_FLAG_SUB_CARRIER:
1443 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a;
1444 break;
1445 case ISO15693_REQ_FLAG_DATA_RATE:
1446 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1447 break;
1448 case (ISO15693_REQ_FLAG_SUB_CARRIER |
1449 ISO15693_REQ_FLAG_DATA_RATE):
1450 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669;
1451 break;
1452 }
1453
1454 if (iso_ctrl != trf->iso_ctrl) {
1455 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1456 if (ret)
1457 return ret;
1458
1459 trf->iso_ctrl = iso_ctrl;
1460 }
1461
1462 if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) {
1463 if (trf7970a_is_iso15693_write_or_lock(req[1]) &&
1464 (req[0] & ISO15693_REQ_FLAG_OPTION))
1465 trf->issue_eof = true;
1466 else if ((trf->quirks &
1467 TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) &&
1468 (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK))
1469 trf->adjust_resp_len = true;
1470 }
1471 }
1472
1473 return 0;
1474 }
1475
1476 static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,
1477 struct sk_buff *skb, u16 timeout,
1478 nfc_digital_cmd_complete_t cb, void *arg)
1479 {
1480 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1481 u8 prefix[5];
1482 unsigned int len;
1483 int ret;
1484 u8 status;
1485
1486 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
1487 trf->state, timeout, skb->len);
1488
1489 if (skb->len > TRF7970A_TX_MAX)
1490 return -EINVAL;
1491
1492 mutex_lock(&trf->lock);
1493
1494 if ((trf->state != TRF7970A_ST_IDLE) &&
1495 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1496 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1497 trf->state);
1498 ret = -EIO;
1499 goto out_err;
1500 }
1501
1502 if (trf->aborting) {
1503 dev_dbg(trf->dev, "Abort process complete\n");
1504 trf->aborting = false;
1505 ret = -ECANCELED;
1506 goto out_err;
1507 }
1508
1509 if (timeout) {
1510 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1511 GFP_KERNEL);
1512 if (!trf->rx_skb) {
1513 dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1514 ret = -ENOMEM;
1515 goto out_err;
1516 }
1517 }
1518
1519 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) {
1520 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1521 if (ret)
1522 goto out_err;
1523
1524 trf->state = TRF7970A_ST_IDLE;
1525 }
1526
1527 if (trf->is_initiator) {
1528 ret = trf7970a_per_cmd_config(trf, skb);
1529 if (ret)
1530 goto out_err;
1531 }
1532
1533 trf->ddev = ddev;
1534 trf->tx_skb = skb;
1535 trf->cb = cb;
1536 trf->cb_arg = arg;
1537 trf->timeout = timeout;
1538 trf->ignore_timeout = false;
1539
1540 len = skb->len;
1541
1542 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
1543 * on what the current framing is, the address of the TX length byte 1
1544 * register (0x1d), and the 2 byte length of the data to be transmitted.
1545 * That totals 5 bytes.
1546 */
1547 prefix[0] = TRF7970A_CMD_BIT_CTRL |
1548 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET);
1549 prefix[1] = TRF7970A_CMD_BIT_CTRL |
1550 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd);
1551 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1;
1552
1553 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {
1554 prefix[3] = 0x00;
1555 prefix[4] = 0x0f; /* 7 bits */
1556 } else {
1557 prefix[3] = (len & 0xf00) >> 4;
1558 prefix[3] |= ((len & 0xf0) >> 4);
1559 prefix[4] = ((len & 0x0f) << 4);
1560 }
1561
1562 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
1563
1564 /* Clear possible spurious interrupt */
1565 ret = trf7970a_read_irqstatus(trf, &status);
1566 if (ret)
1567 goto out_err;
1568
1569 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));
1570 if (ret) {
1571 kfree_skb(trf->rx_skb);
1572 trf->rx_skb = NULL;
1573 }
1574
1575 out_err:
1576 mutex_unlock(&trf->lock);
1577 return ret;
1578 }
1579
1580 static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)
1581 {
1582 int ret = 0;
1583
1584 dev_dbg(trf->dev, "rf technology: %d\n", tech);
1585
1586 switch (tech) {
1587 case NFC_DIGITAL_RF_TECH_106A:
1588 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1589 TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A;
1590 trf->modulator_sys_clk_ctrl =
1591 (trf->modulator_sys_clk_ctrl & 0xf8) |
1592 TRF7970A_MODULATOR_DEPTH_OOK;
1593 break;
1594 case NFC_DIGITAL_RF_TECH_212F:
1595 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1596 TRF7970A_ISO_CTRL_NFC_NFCF_212;
1597 trf->modulator_sys_clk_ctrl =
1598 (trf->modulator_sys_clk_ctrl & 0xf8) |
1599 TRF7970A_MODULATOR_DEPTH_ASK10;
1600 break;
1601 case NFC_DIGITAL_RF_TECH_424F:
1602 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1603 TRF7970A_ISO_CTRL_NFC_NFCF_424;
1604 trf->modulator_sys_clk_ctrl =
1605 (trf->modulator_sys_clk_ctrl & 0xf8) |
1606 TRF7970A_MODULATOR_DEPTH_ASK10;
1607 break;
1608 default:
1609 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1610 return -EINVAL;
1611 }
1612
1613 trf->technology = tech;
1614
1615 /* Normally we write the ISO_CTRL register in
1616 * trf7970a_tg_config_framing() because the framing can change
1617 * the value written. However, when sending a PSL RES,
1618 * digital_tg_send_psl_res_complete() doesn't call
1619 * trf7970a_tg_config_framing() so we must write the register
1620 * here.
1621 */
1622 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) &&
1623 (trf->iso_ctrl_tech != trf->iso_ctrl)) {
1624 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
1625 trf->iso_ctrl_tech);
1626
1627 trf->iso_ctrl = trf->iso_ctrl_tech;
1628 }
1629
1630 return ret;
1631 }
1632
1633 /* Since this is a target routine, several of the framing calls are
1634 * made between receiving the request and sending the response so they
1635 * should take effect until after the response is sent. This is accomplished
1636 * by skipping the ISO_CTRL register write here and doing it in the interrupt
1637 * handler.
1638 */
1639 static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing)
1640 {
1641 u8 iso_ctrl = trf->iso_ctrl_tech;
1642 int ret;
1643
1644 dev_dbg(trf->dev, "framing: %d\n", framing);
1645
1646 switch (framing) {
1647 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1648 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1649 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1650 break;
1651 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1652 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1653 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
1654 /* These ones are applied in the interrupt handler */
1655 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */
1656 break;
1657 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1658 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1659 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1660 break;
1661 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED:
1662 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1663 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1664 break;
1665 default:
1666 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1667 return -EINVAL;
1668 }
1669
1670 trf->framing = framing;
1671
1672 if (iso_ctrl != trf->iso_ctrl) {
1673 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1674 if (ret)
1675 return ret;
1676
1677 trf->iso_ctrl = iso_ctrl;
1678
1679 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1680 trf->modulator_sys_clk_ctrl);
1681 if (ret)
1682 return ret;
1683 }
1684
1685 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1686 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1687 trf->chip_status_ctrl |
1688 TRF7970A_CHIP_STATUS_RF_ON);
1689 if (ret)
1690 return ret;
1691
1692 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1693 }
1694
1695 return 0;
1696 }
1697
1698 static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
1699 int param)
1700 {
1701 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1702 int ret;
1703
1704 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1705
1706 mutex_lock(&trf->lock);
1707
1708 trf->is_initiator = false;
1709
1710 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1711 (trf->state == TRF7970A_ST_RF_OFF)) {
1712 ret = trf7970a_switch_rf_on(trf);
1713 if (ret)
1714 goto err_unlock;
1715 }
1716
1717 switch (type) {
1718 case NFC_DIGITAL_CONFIG_RF_TECH:
1719 ret = trf7970a_tg_config_rf_tech(trf, param);
1720 break;
1721 case NFC_DIGITAL_CONFIG_FRAMING:
1722 ret = trf7970a_tg_config_framing(trf, param);
1723 break;
1724 default:
1725 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1726 ret = -EINVAL;
1727 }
1728
1729 err_unlock:
1730 mutex_unlock(&trf->lock);
1731 return ret;
1732 }
1733
1734 static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1735 nfc_digital_cmd_complete_t cb, void *arg,
1736 bool mode_detect)
1737 {
1738 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1739 int ret;
1740
1741 mutex_lock(&trf->lock);
1742
1743 if ((trf->state != TRF7970A_ST_IDLE) &&
1744 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1745 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1746 trf->state);
1747 ret = -EIO;
1748 goto out_err;
1749 }
1750
1751 if (trf->aborting) {
1752 dev_dbg(trf->dev, "Abort process complete\n");
1753 trf->aborting = false;
1754 ret = -ECANCELED;
1755 goto out_err;
1756 }
1757
1758 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1759 GFP_KERNEL);
1760 if (!trf->rx_skb) {
1761 dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1762 ret = -ENOMEM;
1763 goto out_err;
1764 }
1765
1766 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS,
1767 TRF7970A_RX_SPECIAL_SETTINGS_HBT |
1768 TRF7970A_RX_SPECIAL_SETTINGS_M848 |
1769 TRF7970A_RX_SPECIAL_SETTINGS_C424 |
1770 TRF7970A_RX_SPECIAL_SETTINGS_C212);
1771 if (ret)
1772 goto out_err;
1773
1774 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
1775 trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));
1776 if (ret)
1777 goto out_err;
1778
1779 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL,
1780 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3));
1781 if (ret)
1782 goto out_err;
1783
1784 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL,
1785 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7));
1786 if (ret)
1787 goto out_err;
1788
1789 trf->ddev = ddev;
1790 trf->cb = cb;
1791 trf->cb_arg = arg;
1792 trf->timeout = timeout;
1793 trf->ignore_timeout = false;
1794
1795 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1796 if (ret)
1797 goto out_err;
1798
1799 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD :
1800 TRF7970A_ST_LISTENING;
1801
1802 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
1803
1804 out_err:
1805 mutex_unlock(&trf->lock);
1806 return ret;
1807 }
1808
1809 static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1810 nfc_digital_cmd_complete_t cb, void *arg)
1811 {
1812 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1813
1814 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n",
1815 trf->state, timeout);
1816
1817 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false);
1818 }
1819
1820 static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev,
1821 u16 timeout, nfc_digital_cmd_complete_t cb,
1822 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
1843 static 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
1855 static 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);
1862
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;
1870 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;
1875 default:
1876 break;
1877 }
1878
1879 mutex_unlock(&trf->lock);
1880 }
1881
1882 static struct nfc_digital_ops trf7970a_nfc_ops = {
1883 .in_configure_hw = trf7970a_in_configure_hw,
1884 .in_send_cmd = trf7970a_send_cmd,
1885 .tg_configure_hw = trf7970a_tg_configure_hw,
1886 .tg_send_cmd = trf7970a_send_cmd,
1887 .tg_listen = trf7970a_tg_listen,
1888 .tg_listen_md = trf7970a_tg_listen_md,
1889 .tg_get_rf_tech = trf7970a_tg_get_rf_tech,
1890 .switch_rf = trf7970a_switch_rf,
1891 .abort_cmd = trf7970a_abort_cmd,
1892 };
1893
1894 static 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->en2_gpiod &&
1912 !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) {
1913 gpiod_set_value_cansleep(trf->en2_gpiod, 1);
1914 usleep_range(1000, 2000);
1915 }
1916
1917 gpiod_set_value_cansleep(trf->en_gpiod, 1);
1918
1919 usleep_range(20000, 21000);
1920
1921 trf->state = TRF7970A_ST_RF_OFF;
1922
1923 return 0;
1924 }
1925
1926 static int trf7970a_power_down(struct trf7970a *trf)
1927 {
1928 int ret;
1929
1930 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state);
1931
1932 if (trf->state == TRF7970A_ST_PWR_OFF)
1933 return 0;
1934
1935 if (trf->state != TRF7970A_ST_RF_OFF) {
1936 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n",
1937 trf->state);
1938 return -EBUSY;
1939 }
1940
1941 gpiod_set_value_cansleep(trf->en_gpiod, 0);
1942
1943 if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW))
1944 gpiod_set_value_cansleep(trf->en2_gpiod, 0);
1945
1946 ret = regulator_disable(trf->regulator);
1947 if (ret)
1948 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__,
1949 ret);
1950
1951 trf->state = TRF7970A_ST_PWR_OFF;
1952
1953 return ret;
1954 }
1955
1956 static int trf7970a_startup(struct trf7970a *trf)
1957 {
1958 int ret;
1959
1960 ret = trf7970a_power_up(trf);
1961 if (ret)
1962 return ret;
1963
1964 pm_runtime_set_active(trf->dev);
1965 pm_runtime_enable(trf->dev);
1966 pm_runtime_mark_last_busy(trf->dev);
1967
1968 return 0;
1969 }
1970
1971 static void trf7970a_shutdown(struct trf7970a *trf)
1972 {
1973 switch (trf->state) {
1974 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1975 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1976 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1977 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
1978 case TRF7970A_ST_LISTENING:
1979 trf7970a_send_err_upstream(trf, -ECANCELED);
1980 /* FALLTHROUGH */
1981 case TRF7970A_ST_IDLE:
1982 case TRF7970A_ST_IDLE_RX_BLOCKED:
1983 trf7970a_switch_rf_off(trf);
1984 break;
1985 default:
1986 break;
1987 }
1988
1989 pm_runtime_disable(trf->dev);
1990 pm_runtime_set_suspended(trf->dev);
1991
1992 trf7970a_power_down(trf);
1993 }
1994
1995 static int trf7970a_get_autosuspend_delay(struct device_node *np)
1996 {
1997 int autosuspend_delay, ret;
1998
1999 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay);
2000 if (ret)
2001 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY;
2002
2003 return autosuspend_delay;
2004 }
2005
2006 static int trf7970a_probe(struct spi_device *spi)
2007 {
2008 struct device_node *np = spi->dev.of_node;
2009 struct trf7970a *trf;
2010 int uvolts, autosuspend_delay, ret;
2011 u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY;
2012
2013 if (!np) {
2014 dev_err(&spi->dev, "No Device Tree entry\n");
2015 return -EINVAL;
2016 }
2017
2018 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL);
2019 if (!trf)
2020 return -ENOMEM;
2021
2022 trf->state = TRF7970A_ST_PWR_OFF;
2023 trf->dev = &spi->dev;
2024 trf->spi = spi;
2025
2026 spi->mode = SPI_MODE_1;
2027 spi->bits_per_word = 8;
2028
2029 ret = spi_setup(spi);
2030 if (ret < 0) {
2031 dev_err(trf->dev, "Can't set up SPI Communication\n");
2032 return ret;
2033 }
2034
2035 if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk"))
2036 trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE;
2037
2038 if (of_property_read_bool(np, "irq-status-read-quirk"))
2039 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ;
2040
2041 /* There are two enable pins - only EN must be present in the DT */
2042 trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0,
2043 GPIOD_OUT_LOW);
2044 if (IS_ERR(trf->en_gpiod)) {
2045 dev_err(trf->dev, "No EN GPIO property\n");
2046 return PTR_ERR(trf->en_gpiod);
2047 }
2048
2049 trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1,
2050 GPIOD_OUT_LOW);
2051 if (!trf->en2_gpiod) {
2052 dev_info(trf->dev, "No EN2 GPIO property\n");
2053 } else if (IS_ERR(trf->en2_gpiod)) {
2054 dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n",
2055 PTR_ERR(trf->en2_gpiod));
2056 return PTR_ERR(trf->en2_gpiod);
2057 } else if (of_property_read_bool(np, "en2-rf-quirk")) {
2058 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
2059 }
2060
2061 of_property_read_u32(np, "clock-frequency", &clk_freq);
2062 if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) &&
2063 (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) {
2064 dev_err(trf->dev,
2065 "clock-frequency (%u Hz) unsupported\n", clk_freq);
2066 return -EINVAL;
2067 }
2068
2069 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
2070 trf7970a_irq,
2071 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
2072 "trf7970a", trf);
2073 if (ret) {
2074 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
2075 return ret;
2076 }
2077
2078 mutex_init(&trf->lock);
2079 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
2080
2081 trf->regulator = devm_regulator_get(&spi->dev, "vin");
2082 if (IS_ERR(trf->regulator)) {
2083 ret = PTR_ERR(trf->regulator);
2084 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
2085 goto err_destroy_lock;
2086 }
2087
2088 ret = regulator_enable(trf->regulator);
2089 if (ret) {
2090 dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
2091 goto err_destroy_lock;
2092 }
2093
2094 uvolts = regulator_get_voltage(trf->regulator);
2095 if (uvolts > 4000000)
2096 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;
2097
2098 trf->regulator = devm_regulator_get(&spi->dev, "vdd-io");
2099 if (IS_ERR(trf->regulator)) {
2100 ret = PTR_ERR(trf->regulator);
2101 dev_err(trf->dev, "Can't get VDD_IO 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 VDD_IO: %d\n", ret);
2108 goto err_destroy_lock;
2109 }
2110
2111 if (regulator_get_voltage(trf->regulator) == 1800000) {
2112 trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW;
2113 dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n");
2114 }
2115
2116 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
2117 TRF7970A_SUPPORTED_PROTOCOLS,
2118 NFC_DIGITAL_DRV_CAPS_IN_CRC |
2119 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0,
2120 0);
2121 if (!trf->ddev) {
2122 dev_err(trf->dev, "Can't allocate NFC digital device\n");
2123 ret = -ENOMEM;
2124 goto err_disable_regulator;
2125 }
2126
2127 nfc_digital_set_parent_dev(trf->ddev, trf->dev);
2128 nfc_digital_set_drvdata(trf->ddev, trf);
2129 spi_set_drvdata(spi, trf);
2130
2131 autosuspend_delay = trf7970a_get_autosuspend_delay(np);
2132
2133 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
2134 pm_runtime_use_autosuspend(trf->dev);
2135
2136 ret = trf7970a_startup(trf);
2137 if (ret)
2138 goto err_free_ddev;
2139
2140 ret = nfc_digital_register_device(trf->ddev);
2141 if (ret) {
2142 dev_err(trf->dev, "Can't register NFC digital device: %d\n",
2143 ret);
2144 goto err_shutdown;
2145 }
2146
2147 return 0;
2148
2149 err_shutdown:
2150 trf7970a_shutdown(trf);
2151 err_free_ddev:
2152 nfc_digital_free_device(trf->ddev);
2153 err_disable_regulator:
2154 regulator_disable(trf->regulator);
2155 err_destroy_lock:
2156 mutex_destroy(&trf->lock);
2157 return ret;
2158 }
2159
2160 static int trf7970a_remove(struct spi_device *spi)
2161 {
2162 struct trf7970a *trf = spi_get_drvdata(spi);
2163
2164 mutex_lock(&trf->lock);
2165
2166 trf7970a_shutdown(trf);
2167
2168 mutex_unlock(&trf->lock);
2169
2170 nfc_digital_unregister_device(trf->ddev);
2171 nfc_digital_free_device(trf->ddev);
2172
2173 regulator_disable(trf->regulator);
2174
2175 mutex_destroy(&trf->lock);
2176
2177 return 0;
2178 }
2179
2180 #ifdef CONFIG_PM_SLEEP
2181 static int trf7970a_suspend(struct device *dev)
2182 {
2183 struct spi_device *spi = to_spi_device(dev);
2184 struct trf7970a *trf = spi_get_drvdata(spi);
2185
2186 dev_dbg(dev, "Suspend\n");
2187
2188 mutex_lock(&trf->lock);
2189
2190 trf7970a_shutdown(trf);
2191
2192 mutex_unlock(&trf->lock);
2193
2194 return 0;
2195 }
2196
2197 static int trf7970a_resume(struct device *dev)
2198 {
2199 struct spi_device *spi = to_spi_device(dev);
2200 struct trf7970a *trf = spi_get_drvdata(spi);
2201 int ret;
2202
2203 dev_dbg(dev, "Resume\n");
2204
2205 mutex_lock(&trf->lock);
2206
2207 ret = trf7970a_startup(trf);
2208
2209 mutex_unlock(&trf->lock);
2210
2211 return ret;
2212 }
2213 #endif
2214
2215 #ifdef CONFIG_PM
2216 static int trf7970a_pm_runtime_suspend(struct device *dev)
2217 {
2218 struct spi_device *spi = to_spi_device(dev);
2219 struct trf7970a *trf = spi_get_drvdata(spi);
2220 int ret;
2221
2222 dev_dbg(dev, "Runtime suspend\n");
2223
2224 mutex_lock(&trf->lock);
2225
2226 ret = trf7970a_power_down(trf);
2227
2228 mutex_unlock(&trf->lock);
2229
2230 return ret;
2231 }
2232
2233 static int trf7970a_pm_runtime_resume(struct device *dev)
2234 {
2235 struct spi_device *spi = to_spi_device(dev);
2236 struct trf7970a *trf = spi_get_drvdata(spi);
2237 int ret;
2238
2239 dev_dbg(dev, "Runtime resume\n");
2240
2241 ret = trf7970a_power_up(trf);
2242 if (!ret)
2243 pm_runtime_mark_last_busy(dev);
2244
2245 return ret;
2246 }
2247 #endif
2248
2249 static const struct dev_pm_ops trf7970a_pm_ops = {
2250 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
2251 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
2252 trf7970a_pm_runtime_resume, NULL)
2253 };
2254
2255 static const struct of_device_id trf7970a_of_match[] = {
2256 {.compatible = "ti,trf7970a",},
2257 {},
2258 };
2259
2260 MODULE_DEVICE_TABLE(of, trf7970a_of_match);
2261
2262 static const struct spi_device_id trf7970a_id_table[] = {
2263 {"trf7970a", 0},
2264 {}
2265 };
2266
2267 MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
2268
2269 static struct spi_driver trf7970a_spi_driver = {
2270 .probe = trf7970a_probe,
2271 .remove = trf7970a_remove,
2272 .id_table = trf7970a_id_table,
2273 .driver = {
2274 .name = "trf7970a",
2275 .of_match_table = of_match_ptr(trf7970a_of_match),
2276 .pm = &trf7970a_pm_ops,
2277 },
2278 };
2279
2280 module_spi_driver(trf7970a_spi_driver);
2281
2282 MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
2283 MODULE_LICENSE("GPL v2");
2284 MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");
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