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perf bench futex: Cache align the worker struct
[linux/fpc-iii.git] / drivers / nfc / trf7970a.c
blob26c9dbbccb0c504c59fcec5157adf2310c323587
1 /*
2 * TI TRF7970a RFID/NFC Transceiver Driver
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Author: Erick Macias <emacias@ti.com>
7 * Author: Felipe Balbi <balbi@ti.com>
8 * Author: Mark A. Greer <mgreer@animalcreek.com>
9 *
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 of
12 * the License as published by the Free Software Foundation.
13 */
14
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/netdevice.h>
18 #include <linux/interrupt.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/nfc.h>
21 #include <linux/skbuff.h>
22 #include <linux/delay.h>
23 #include <linux/gpio.h>
24 #include <linux/of.h>
25 #include <linux/of_gpio.h>
26 #include <linux/spi/spi.h>
27 #include <linux/regulator/consumer.h>
28
29 #include <net/nfc/nfc.h>
30 #include <net/nfc/digital.h>
31
32 /* There are 3 ways the host can communicate with the trf7970a:
33 * parallel mode, SPI with Slave Select (SS) mode, and SPI without
34 * SS mode. The driver only supports the two SPI modes.
35 *
36 * The trf7970a is very timing sensitive and the VIN, EN2, and EN
37 * pins must asserted in that order and with specific delays in between.
38 * The delays used in the driver were provided by TI and have been
39 * confirmed to work with this driver. There is a bug with the current
40 * version of the trf7970a that requires that EN2 remain low no matter
41 * what. If it goes high, it will generate an RF field even when in
42 * passive target mode. TI has indicated that the chip will work okay
43 * when EN2 is left low. The 'en2-rf-quirk' device tree property
44 * indicates that trf7970a currently being used has the erratum and
45 * that EN2 must be kept low.
46 *
47 * Timeouts are implemented using the delayed workqueue kernel facility.
48 * Timeouts are required so things don't hang when there is no response
49 * from the trf7970a (or tag). Using this mechanism creates a race with
50 * interrupts, however. That is, an interrupt and a timeout could occur
51 * closely enough together that one is blocked by the mutex while the other
52 * executes. When the timeout handler executes first and blocks the
53 * interrupt handler, it will eventually set the state to IDLE so the
54 * interrupt handler will check the state and exit with no harm done.
55 * When the interrupt handler executes first and blocks the timeout handler,
56 * the cancel_delayed_work() call will know that it didn't cancel the
57 * work item (i.e., timeout) and will return zero. That return code is
58 * used by the timer handler to indicate that it should ignore the timeout
59 * once its unblocked.
60 *
61 * Aborting an active command isn't as simple as it seems because the only
62 * way to abort a command that's already been sent to the tag is so turn
63 * off power to the tag. If we do that, though, we'd have to go through
64 * the entire anticollision procedure again but the digital layer doesn't
65 * support that. So, if an abort is received before trf7970a_send_cmd()
66 * has sent the command to the tag, it simply returns -ECANCELED. If the
67 * command has already been sent to the tag, then the driver continues
68 * normally and recieves the response data (or error) but just before
69 * sending the data upstream, it frees the rx_skb and sends -ECANCELED
70 * upstream instead. If the command failed, that error will be sent
71 * upstream.
72 *
73 * When recieving data from a tag and the interrupt status register has
74 * only the SRX bit set, it means that all of the data has been received
75 * (once what's in the fifo has been read). However, depending on timing
76 * an interrupt status with only the SRX bit set may not be recived. In
77 * those cases, the timeout mechanism is used to wait 20 ms in case more
78 * data arrives. After 20 ms, it is assumed that all of the data has been
79 * received and the accumulated rx data is sent upstream. The
80 * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose
81 * (i.e., it indicates that some data has been received but we're not sure
82 * if there is more coming so a timeout in this state means all data has
83 * been received and there isn't an error). The delay is 20 ms since delays
84 * of ~16 ms have been observed during testing.
85 *
86 * When transmitting a frame larger than the FIFO size (127 bytes), the
87 * driver will wait 20 ms for the FIFO to drain past the low-watermark
88 * and generate an interrupt. The low-watermark set to 32 bytes so the
89 * interrupt should fire after 127 - 32 = 95 bytes have been sent. At
90 * the lowest possible bit rate (6.62 kbps for 15693), it will take up
91 * to ~14.35 ms so 20 ms is used for the timeout.
92 *
93 * Type 2 write and sector select commands respond with a 4-bit ACK or NACK.
94 * Having only 4 bits in the FIFO won't normally generate an interrupt so
95 * driver enables the '4_bit_RX' bit of the Special Functions register 1
96 * to cause an interrupt in that case. Leaving that bit for a read command
97 * messes up the data returned so it is only enabled when the framing is
98 * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command.
99 * Unfortunately, that means that the driver has to peek into tx frames
100 * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by
101 * the trf7970a_per_cmd_config() routine.
102 *
103 * ISO/IEC 15693 frames specify whether to use single or double sub-carrier
104 * frequencies and whether to use low or high data rates in the flags byte
105 * of the frame. This means that the driver has to peek at all 15693 frames
106 * to determine what speed to set the communication to. In addition, write
107 * and lock commands use the OPTION flag to indicate that an EOF must be
108 * sent to the tag before it will send its response. So the driver has to
109 * examine all frames for that reason too.
110 *
111 * It is unclear how long to wait before sending the EOF. According to the
112 * Note under Table 1-1 in section 1.6 of
113 * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least
114 * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long
115 * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain
116 * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to
117 * ensure the wait is long enough before sending the EOF. This seems to work
118 * reliably.
119 */
120
121 #define TRF7970A_SUPPORTED_PROTOCOLS \
122 (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \
123 NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \
124 NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK)
125
126 #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */
127
128 #define TRF7970A_RX_SKB_ALLOC_SIZE 256
129
130 #define TRF7970A_FIFO_SIZE 127
131
132 /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */
133 #define TRF7970A_TX_MAX (4096 - 1)
134
135 #define TRF7970A_WAIT_FOR_TX_IRQ 20
136 #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20
137 #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20
138 #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40
139
140 /* Guard times for various RF technologies (in us) */
141 #define TRF7970A_GUARD_TIME_NFCA 5000
142 #define TRF7970A_GUARD_TIME_NFCB 5000
143 #define TRF7970A_GUARD_TIME_NFCF 20000
144 #define TRF7970A_GUARD_TIME_15693 1000
145
146 /* Quirks */
147 /* Erratum: When reading IRQ Status register on trf7970a, we must issue a
148 * read continuous command for IRQ Status and Collision Position registers.
149 */
150 #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0)
151 #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1)
152 #define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2)
153
154 /* Direct commands */
155 #define TRF7970A_CMD_IDLE 0x00
156 #define TRF7970A_CMD_SOFT_INIT 0x03
157 #define TRF7970A_CMD_RF_COLLISION 0x04
158 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05
159 #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06
160 #define TRF7970A_CMD_FIFO_RESET 0x0f
161 #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10
162 #define TRF7970A_CMD_TRANSMIT 0x11
163 #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12
164 #define TRF7970A_CMD_DELAY_TRANSMIT 0x13
165 #define TRF7970A_CMD_EOF 0x14
166 #define TRF7970A_CMD_CLOSE_SLOT 0x15
167 #define TRF7970A_CMD_BLOCK_RX 0x16
168 #define TRF7970A_CMD_ENABLE_RX 0x17
169 #define TRF7970A_CMD_TEST_INT_RF 0x18
170 #define TRF7970A_CMD_TEST_EXT_RF 0x19
171 #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a
172
173 /* Bits determining whether its a direct command or register R/W,
174 * whether to use a continuous SPI transaction or not, and the actual
175 * direct cmd opcode or regster address.
176 */
177 #define TRF7970A_CMD_BIT_CTRL BIT(7)
178 #define TRF7970A_CMD_BIT_RW BIT(6)
179 #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5)
180 #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f)
181
182 /* Registers addresses */
183 #define TRF7970A_CHIP_STATUS_CTRL 0x00
184 #define TRF7970A_ISO_CTRL 0x01
185 #define TRF7970A_ISO14443B_TX_OPTIONS 0x02
186 #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03
187 #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04
188 #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05
189 #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06
190 #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07
191 #define TRF7970A_RX_WAIT_TIME 0x08
192 #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09
193 #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a
194 #define TRF7970A_REG_IO_CTRL 0x0b
195 #define TRF7970A_IRQ_STATUS 0x0c
196 #define TRF7970A_COLLISION_IRQ_MASK 0x0d
197 #define TRF7970A_COLLISION_POSITION 0x0e
198 #define TRF7970A_RSSI_OSC_STATUS 0x0f
199 #define TRF7970A_SPECIAL_FCN_REG1 0x10
200 #define TRF7970A_SPECIAL_FCN_REG2 0x11
201 #define TRF7970A_RAM1 0x12
202 #define TRF7970A_RAM2 0x13
203 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14
204 #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16
205 #define TRF7970A_NFCID1 0x17
206 #define TRF7970A_NFC_TARGET_LEVEL 0x18
207 #define TRF79070A_NFC_TARGET_PROTOCOL 0x19
208 #define TRF7970A_TEST_REGISTER1 0x1a
209 #define TRF7970A_TEST_REGISTER2 0x1b
210 #define TRF7970A_FIFO_STATUS 0x1c
211 #define TRF7970A_TX_LENGTH_BYTE1 0x1d
212 #define TRF7970A_TX_LENGTH_BYTE2 0x1e
213 #define TRF7970A_FIFO_IO_REGISTER 0x1f
214
215 /* Chip Status Control Register Bits */
216 #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0)
217 #define TRF7970A_CHIP_STATUS_REC_ON BIT(1)
218 #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2)
219 #define TRF7970A_CHIP_STATUS_PM_ON BIT(3)
220 #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4)
221 #define TRF7970A_CHIP_STATUS_RF_ON BIT(5)
222 #define TRF7970A_CHIP_STATUS_DIRECT BIT(6)
223 #define TRF7970A_CHIP_STATUS_STBY BIT(7)
224
225 /* ISO Control Register Bits */
226 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00
227 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01
228 #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02
229 #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03
230 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04
231 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05
232 #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06
233 #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07
234 #define TRF7970A_ISO_CTRL_14443A_106 0x08
235 #define TRF7970A_ISO_CTRL_14443A_212 0x09
236 #define TRF7970A_ISO_CTRL_14443A_424 0x0a
237 #define TRF7970A_ISO_CTRL_14443A_848 0x0b
238 #define TRF7970A_ISO_CTRL_14443B_106 0x0c
239 #define TRF7970A_ISO_CTRL_14443B_212 0x0d
240 #define TRF7970A_ISO_CTRL_14443B_424 0x0e
241 #define TRF7970A_ISO_CTRL_14443B_848 0x0f
242 #define TRF7970A_ISO_CTRL_FELICA_212 0x1a
243 #define TRF7970A_ISO_CTRL_FELICA_424 0x1b
244 #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01
245 #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02
246 #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03
247 #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00
248 #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01
249 #define TRF7970A_ISO_CTRL_NFC_CE BIT(2)
250 #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3)
251 #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4)
252 #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5)
253 #define TRF7970A_ISO_CTRL_RFID BIT(5)
254 #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6)
255 #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */
256
257 #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f
258
259 /* Modulator and SYS_CLK Control Register Bits */
260 #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7)
261 #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0))
262 #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1))
263 #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2))
264 #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3))
265 #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4))
266 #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5))
267 #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6))
268 #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7))
269 #define TRF7970A_MODULATOR_EN_ANA BIT(3)
270 #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4)
271 #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0))
272 #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1))
273 #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2))
274 #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3))
275 #define TRF7970A_MODULATOR_EN_OOK BIT(6)
276 #define TRF7970A_MODULATOR_27MHZ BIT(7)
277
278 #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0)
279 #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1)
280 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2)
281 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2)
282 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2)
283 #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2)
284 #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4)
285 #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5)
286 #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6)
287 #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7)
288
289 #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07)
290 #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5)
291 #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6)
292 #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7)
293
294 /* IRQ Status Register Bits */
295 #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */
296 #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0)
297 #define TRF7970A_IRQ_STATUS_COL BIT(1)
298 #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2)
299 #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2)
300 #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3)
301 #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3)
302 #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4)
303 #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4)
304 #define TRF7970A_IRQ_STATUS_FIFO BIT(5)
305 #define TRF7970A_IRQ_STATUS_SRX BIT(6)
306 #define TRF7970A_IRQ_STATUS_TX BIT(7)
307
308 #define TRF7970A_IRQ_STATUS_ERROR \
309 (TRF7970A_IRQ_STATUS_COL | \
310 TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \
311 TRF7970A_IRQ_STATUS_PARITY_ERROR | \
312 TRF7970A_IRQ_STATUS_CRC_ERROR)
313
314 #define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0))
315 #define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3))
316 #define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6)
317
318 #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0)
319 #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1)
320 #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2)
321 #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3)
322 #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4)
323 #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5)
324
325 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2)
326 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2)
327 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2)
328 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2)
329 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0
330 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1
331 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2
332 #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3
333
334 #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07)
335 #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7)
336
337 #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07)
338 #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3)
339 #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5)
340 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6)
341 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6)
342 #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6)
343
344 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0)
345 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1)
346 #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1))
347 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2)
348 #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3)
349 #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4)
350 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6)
351 #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7)
352
353 #define TRF79070A_NFC_TARGET_PROTOCOL_106A \
354 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
355 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
356 TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \
357 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
358
359 #define TRF79070A_NFC_TARGET_PROTOCOL_106B \
360 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
361 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
362 TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \
363 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
364
365 #define TRF79070A_NFC_TARGET_PROTOCOL_212F \
366 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
367 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
368 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
369 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212)
370
371 #define TRF79070A_NFC_TARGET_PROTOCOL_424F \
372 (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
373 TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
374 TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
375 TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424)
376
377 #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7)
378
379 /* NFC (ISO/IEC 14443A) Type 2 Tag commands */
380 #define NFC_T2T_CMD_READ 0x30
381
382 /* ISO 15693 commands codes */
383 #define ISO15693_CMD_INVENTORY 0x01
384 #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20
385 #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21
386 #define ISO15693_CMD_LOCK_BLOCK 0x22
387 #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23
388 #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24
389 #define ISO15693_CMD_SELECT 0x25
390 #define ISO15693_CMD_RESET_TO_READY 0x26
391 #define ISO15693_CMD_WRITE_AFI 0x27
392 #define ISO15693_CMD_LOCK_AFI 0x28
393 #define ISO15693_CMD_WRITE_DSFID 0x29
394 #define ISO15693_CMD_LOCK_DSFID 0x2a
395 #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b
396 #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c
397
398 /* ISO 15693 request and response flags */
399 #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0)
400 #define ISO15693_REQ_FLAG_DATA_RATE BIT(1)
401 #define ISO15693_REQ_FLAG_INVENTORY BIT(2)
402 #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3)
403 #define ISO15693_REQ_FLAG_SELECT BIT(4)
404 #define ISO15693_REQ_FLAG_AFI BIT(4)
405 #define ISO15693_REQ_FLAG_ADDRESS BIT(5)
406 #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5)
407 #define ISO15693_REQ_FLAG_OPTION BIT(6)
408
409 #define ISO15693_REQ_FLAG_SPEED_MASK \
410 (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE)
411
412 enum trf7970a_state {
413 TRF7970A_ST_PWR_OFF,
414 TRF7970A_ST_RF_OFF,
415 TRF7970A_ST_IDLE,
416 TRF7970A_ST_IDLE_RX_BLOCKED,
417 TRF7970A_ST_WAIT_FOR_TX_FIFO,
418 TRF7970A_ST_WAIT_FOR_RX_DATA,
419 TRF7970A_ST_WAIT_FOR_RX_DATA_CONT,
420 TRF7970A_ST_WAIT_TO_ISSUE_EOF,
421 TRF7970A_ST_LISTENING,
422 TRF7970A_ST_LISTENING_MD,
423 TRF7970A_ST_MAX
424 };
425
426 struct trf7970a {
427 enum trf7970a_state state;
428 struct device *dev;
429 struct spi_device *spi;
430 struct regulator *regulator;
431 struct nfc_digital_dev *ddev;
432 u32 quirks;
433 bool is_initiator;
434 bool aborting;
435 struct sk_buff *tx_skb;
436 struct sk_buff *rx_skb;
437 nfc_digital_cmd_complete_t cb;
438 void *cb_arg;
439 u8 chip_status_ctrl;
440 u8 iso_ctrl;
441 u8 iso_ctrl_tech;
442 u8 modulator_sys_clk_ctrl;
443 u8 special_fcn_reg1;
444 unsigned int guard_time;
445 int technology;
446 int framing;
447 u8 md_rf_tech;
448 u8 tx_cmd;
449 bool issue_eof;
450 bool adjust_resp_len;
451 int en2_gpio;
452 int en_gpio;
453 struct mutex lock;
454 unsigned int timeout;
455 bool ignore_timeout;
456 struct delayed_work timeout_work;
457 };
458
459
460 static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)
461 {
462 u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode);
463 int ret;
464
465 dev_dbg(trf->dev, "cmd: 0x%x\n", cmd);
466
467 ret = spi_write(trf->spi, &cmd, 1);
468 if (ret)
469 dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd,
470 ret);
471 return ret;
472 }
473
474 static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)
475 {
476 u8 addr = TRF7970A_CMD_BIT_RW | reg;
477 int ret;
478
479 ret = spi_write_then_read(trf->spi, &addr, 1, val, 1);
480 if (ret)
481 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
482 ret);
483
484 dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val);
485
486 return ret;
487 }
488
489 static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, size_t len)
490 {
491 u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
492 struct spi_transfer t[2];
493 struct spi_message m;
494 int ret;
495
496 dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
497
498 spi_message_init(&m);
499
500 memset(&t, 0, sizeof(t));
501
502 t[0].tx_buf = &addr;
503 t[0].len = sizeof(addr);
504 spi_message_add_tail(&t[0], &m);
505
506 t[1].rx_buf = buf;
507 t[1].len = len;
508 spi_message_add_tail(&t[1], &m);
509
510 ret = spi_sync(trf->spi, &m);
511 if (ret)
512 dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
513 ret);
514 return ret;
515 }
516
517 static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)
518 {
519 u8 buf[2] = { reg, val };
520 int ret;
521
522 dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val);
523
524 ret = spi_write(trf->spi, buf, 2);
525 if (ret)
526 dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__,
527 buf[0], buf[1], ret);
528
529 return ret;
530 }
531
532 static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)
533 {
534 int ret;
535 u8 buf[2];
536 u8 addr;
537
538 addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW;
539
540 if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) {
541 addr |= TRF7970A_CMD_BIT_CONTINUOUS;
542 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
543 } else {
544 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1);
545 }
546
547 if (ret)
548 dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n",
549 __func__, ret);
550 else
551 *status = buf[0];
552
553 return ret;
554 }
555
556 static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto)
557 {
558 int ret;
559 u8 buf[2];
560 u8 addr;
561
562 addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW |
563 TRF7970A_CMD_BIT_CONTINUOUS;
564
565 ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
566 if (ret)
567 dev_err(trf->dev, "%s - target_proto: Read failed: %d\n",
568 __func__, ret);
569 else
570 *target_proto = buf[0];
571
572 return ret;
573 }
574
575 static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech)
576 {
577 int ret;
578 u8 target_proto, tech;
579
580 ret = trf7970a_read_target_proto(trf, &target_proto);
581 if (ret)
582 return ret;
583
584 switch (target_proto) {
585 case TRF79070A_NFC_TARGET_PROTOCOL_106A:
586 tech = NFC_DIGITAL_RF_TECH_106A;
587 break;
588 case TRF79070A_NFC_TARGET_PROTOCOL_106B:
589 tech = NFC_DIGITAL_RF_TECH_106B;
590 break;
591 case TRF79070A_NFC_TARGET_PROTOCOL_212F:
592 tech = NFC_DIGITAL_RF_TECH_212F;
593 break;
594 case TRF79070A_NFC_TARGET_PROTOCOL_424F:
595 tech = NFC_DIGITAL_RF_TECH_424F;
596 break;
597 default:
598 dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n",
599 __func__, target_proto);
600 return -EIO;
601 }
602
603 *rf_tech = tech;
604
605 return ret;
606 }
607
608 static void trf7970a_send_upstream(struct trf7970a *trf)
609 {
610 dev_kfree_skb_any(trf->tx_skb);
611 trf->tx_skb = NULL;
612
613 if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting)
614 print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE,
615 16, 1, trf->rx_skb->data, trf->rx_skb->len,
616 false);
617
618 trf->state = TRF7970A_ST_IDLE;
619
620 if (trf->aborting) {
621 dev_dbg(trf->dev, "Abort process complete\n");
622
623 if (!IS_ERR(trf->rx_skb)) {
624 kfree_skb(trf->rx_skb);
625 trf->rx_skb = ERR_PTR(-ECANCELED);
626 }
627
628 trf->aborting = false;
629 }
630
631 if (trf->adjust_resp_len) {
632 if (trf->rx_skb)
633 skb_trim(trf->rx_skb, trf->rx_skb->len - 1);
634
635 trf->adjust_resp_len = false;
636 }
637
638 trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
639
640 trf->rx_skb = NULL;
641 }
642
643 static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)
644 {
645 dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno);
646
647 cancel_delayed_work(&trf->timeout_work);
648
649 kfree_skb(trf->rx_skb);
650 trf->rx_skb = ERR_PTR(errno);
651
652 trf7970a_send_upstream(trf);
653 }
654
655 static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
656 unsigned int len, u8 *prefix, unsigned int prefix_len)
657 {
658 struct spi_transfer t[2];
659 struct spi_message m;
660 unsigned int timeout;
661 int ret;
662
663 print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE,
664 16, 1, skb->data, len, false);
665
666 spi_message_init(&m);
667
668 memset(&t, 0, sizeof(t));
669
670 t[0].tx_buf = prefix;
671 t[0].len = prefix_len;
672 spi_message_add_tail(&t[0], &m);
673
674 t[1].tx_buf = skb->data;
675 t[1].len = len;
676 spi_message_add_tail(&t[1], &m);
677
678 ret = spi_sync(trf->spi, &m);
679 if (ret) {
680 dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__,
681 ret);
682 return ret;
683 }
684
685 skb_pull(skb, len);
686
687 if (skb->len > 0) {
688 trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO;
689 timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT;
690 } else {
691 if (trf->issue_eof) {
692 trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF;
693 timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF;
694 } else {
695 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
696
697 if (!trf->timeout)
698 timeout = TRF7970A_WAIT_FOR_TX_IRQ;
699 else
700 timeout = trf->timeout;
701 }
702 }
703
704 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout,
705 trf->state);
706
707 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
708
709 return 0;
710 }
711
712 static void trf7970a_fill_fifo(struct trf7970a *trf)
713 {
714 struct sk_buff *skb = trf->tx_skb;
715 unsigned int len;
716 int ret;
717 u8 fifo_bytes;
718 u8 prefix;
719
720 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
721 if (ret) {
722 trf7970a_send_err_upstream(trf, ret);
723 return;
724 }
725
726 dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
727
728 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
729
730 /* Calculate how much more data can be written to the fifo */
731 len = TRF7970A_FIFO_SIZE - fifo_bytes;
732 if (!len) {
733 schedule_delayed_work(&trf->timeout_work,
734 msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
735 return;
736 }
737
738 len = min(skb->len, len);
739
740 prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER;
741
742 ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix));
743 if (ret)
744 trf7970a_send_err_upstream(trf, ret);
745 }
746
747 static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)
748 {
749 struct sk_buff *skb = trf->rx_skb;
750 int ret;
751 u8 fifo_bytes;
752
753 if (status & TRF7970A_IRQ_STATUS_ERROR) {
754 trf7970a_send_err_upstream(trf, -EIO);
755 return;
756 }
757
758 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
759 if (ret) {
760 trf7970a_send_err_upstream(trf, ret);
761 return;
762 }
763
764 dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
765
766 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
767
768 if (!fifo_bytes)
769 goto no_rx_data;
770
771 if (fifo_bytes > skb_tailroom(skb)) {
772 skb = skb_copy_expand(skb, skb_headroom(skb),
773 max_t(int, fifo_bytes,
774 TRF7970A_RX_SKB_ALLOC_SIZE),
775 GFP_KERNEL);
776 if (!skb) {
777 trf7970a_send_err_upstream(trf, -ENOMEM);
778 return;
779 }
780
781 kfree_skb(trf->rx_skb);
782 trf->rx_skb = skb;
783 }
784
785 ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,
786 skb_put(skb, fifo_bytes), fifo_bytes);
787 if (ret) {
788 trf7970a_send_err_upstream(trf, ret);
789 return;
790 }
791
792 /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */
793 if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) &&
794 (trf->special_fcn_reg1 ==
795 TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {
796 skb->data[0] >>= 4;
797 status = TRF7970A_IRQ_STATUS_SRX;
798 } else {
799 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT;
800
801 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
802 if (ret) {
803 trf7970a_send_err_upstream(trf, ret);
804 return;
805 }
806
807 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
808
809 /* If there are bytes in the FIFO, set status to '0' so
810 * the if stmt below doesn't fire and the driver will wait
811 * for the trf7970a to generate another RX interrupt.
812 */
813 if (fifo_bytes)
814 status = 0;
815 }
816
817 no_rx_data:
818 if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */
819 trf7970a_send_upstream(trf);
820 return;
821 }
822
823 dev_dbg(trf->dev, "Setting timeout for %d ms\n",
824 TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT);
825
826 schedule_delayed_work(&trf->timeout_work,
827 msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT));
828 }
829
830 static irqreturn_t trf7970a_irq(int irq, void *dev_id)
831 {
832 struct trf7970a *trf = dev_id;
833 int ret;
834 u8 status, fifo_bytes, iso_ctrl;
835
836 mutex_lock(&trf->lock);
837
838 if (trf->state == TRF7970A_ST_RF_OFF) {
839 mutex_unlock(&trf->lock);
840 return IRQ_NONE;
841 }
842
843 ret = trf7970a_read_irqstatus(trf, &status);
844 if (ret) {
845 mutex_unlock(&trf->lock);
846 return IRQ_NONE;
847 }
848
849 dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state,
850 status);
851
852 if (!status) {
853 mutex_unlock(&trf->lock);
854 return IRQ_NONE;
855 }
856
857 switch (trf->state) {
858 case TRF7970A_ST_IDLE:
859 case TRF7970A_ST_IDLE_RX_BLOCKED:
860 /* If initiator and getting interrupts caused by RF noise,
861 * turn off the receiver to avoid unnecessary interrupts.
862 * It will be turned back on in trf7970a_send_cmd() when
863 * the next command is issued.
864 */
865 if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) {
866 trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);
867 trf->state = TRF7970A_ST_IDLE_RX_BLOCKED;
868 }
869
870 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
871 break;
872 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
873 if (status & TRF7970A_IRQ_STATUS_TX) {
874 trf->ignore_timeout =
875 !cancel_delayed_work(&trf->timeout_work);
876 trf7970a_fill_fifo(trf);
877 } else {
878 trf7970a_send_err_upstream(trf, -EIO);
879 }
880 break;
881 case TRF7970A_ST_WAIT_FOR_RX_DATA:
882 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
883 if (status & TRF7970A_IRQ_STATUS_SRX) {
884 trf->ignore_timeout =
885 !cancel_delayed_work(&trf->timeout_work);
886 trf7970a_drain_fifo(trf, status);
887 } else if (status & TRF7970A_IRQ_STATUS_FIFO) {
888 ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,
889 &fifo_bytes);
890
891 fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
892
893 if (ret)
894 trf7970a_send_err_upstream(trf, ret);
895 else if (!fifo_bytes)
896 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
897 } else if ((status == TRF7970A_IRQ_STATUS_TX) ||
898 (!trf->is_initiator &&
899 (status == (TRF7970A_IRQ_STATUS_TX |
900 TRF7970A_IRQ_STATUS_NFC_RF)))) {
901 trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
902
903 if (!trf->timeout) {
904 trf->ignore_timeout = !cancel_delayed_work(
905 &trf->timeout_work);
906 trf->rx_skb = ERR_PTR(0);
907 trf7970a_send_upstream(trf);
908 break;
909 }
910
911 if (trf->is_initiator)
912 break;
913
914 iso_ctrl = trf->iso_ctrl;
915
916 switch (trf->framing) {
917 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
918 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
919 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
920 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
921 break;
922 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
923 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
924 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
925 trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
926 break;
927 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
928 ret = trf7970a_write(trf,
929 TRF7970A_SPECIAL_FCN_REG1,
930 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL);
931 if (ret)
932 goto err_unlock_exit;
933
934 trf->special_fcn_reg1 =
935 TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL;
936 break;
937 default:
938 break;
939 }
940
941 if (iso_ctrl != trf->iso_ctrl) {
942 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
943 iso_ctrl);
944 if (ret)
945 goto err_unlock_exit;
946
947 trf->iso_ctrl = iso_ctrl;
948 }
949 } else {
950 trf7970a_send_err_upstream(trf, -EIO);
951 }
952 break;
953 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
954 if (status != TRF7970A_IRQ_STATUS_TX)
955 trf7970a_send_err_upstream(trf, -EIO);
956 break;
957 case TRF7970A_ST_LISTENING:
958 if (status & TRF7970A_IRQ_STATUS_SRX) {
959 trf->ignore_timeout =
960 !cancel_delayed_work(&trf->timeout_work);
961 trf7970a_drain_fifo(trf, status);
962 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
963 trf7970a_send_err_upstream(trf, -EIO);
964 }
965 break;
966 case TRF7970A_ST_LISTENING_MD:
967 if (status & TRF7970A_IRQ_STATUS_SRX) {
968 trf->ignore_timeout =
969 !cancel_delayed_work(&trf->timeout_work);
970
971 ret = trf7970a_mode_detect(trf, &trf->md_rf_tech);
972 if (ret) {
973 trf7970a_send_err_upstream(trf, ret);
974 } else {
975 trf->state = TRF7970A_ST_LISTENING;
976 trf7970a_drain_fifo(trf, status);
977 }
978 } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
979 trf7970a_send_err_upstream(trf, -EIO);
980 }
981 break;
982 default:
983 dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
984 __func__, trf->state);
985 }
986
987 err_unlock_exit:
988 mutex_unlock(&trf->lock);
989 return IRQ_HANDLED;
990 }
991
992 static void trf7970a_issue_eof(struct trf7970a *trf)
993 {
994 int ret;
995
996 dev_dbg(trf->dev, "Issuing EOF\n");
997
998 ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
999 if (ret)
1000 trf7970a_send_err_upstream(trf, ret);
1001
1002 ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
1003 if (ret)
1004 trf7970a_send_err_upstream(trf, ret);
1005
1006 trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
1007
1008 dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n",
1009 trf->timeout, trf->state);
1010
1011 schedule_delayed_work(&trf->timeout_work,
1012 msecs_to_jiffies(trf->timeout));
1013 }
1014
1015 static void trf7970a_timeout_work_handler(struct work_struct *work)
1016 {
1017 struct trf7970a *trf = container_of(work, struct trf7970a,
1018 timeout_work.work);
1019
1020 dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n",
1021 trf->state, trf->ignore_timeout);
1022
1023 mutex_lock(&trf->lock);
1024
1025 if (trf->ignore_timeout)
1026 trf->ignore_timeout = false;
1027 else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)
1028 trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);
1029 else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
1030 trf7970a_issue_eof(trf);
1031 else
1032 trf7970a_send_err_upstream(trf, -ETIMEDOUT);
1033
1034 mutex_unlock(&trf->lock);
1035 }
1036
1037 static int trf7970a_init(struct trf7970a *trf)
1038 {
1039 int ret;
1040
1041 dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state);
1042
1043 ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);
1044 if (ret)
1045 goto err_out;
1046
1047 ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);
1048 if (ret)
1049 goto err_out;
1050
1051 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1052 if (ret)
1053 goto err_out;
1054
1055 usleep_range(1000, 2000);
1056
1057 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1058
1059 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, 0);
1060 if (ret)
1061 goto err_out;
1062
1063 trf->modulator_sys_clk_ctrl = 0;
1064
1065 ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,
1066 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |
1067 TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32);
1068 if (ret)
1069 goto err_out;
1070
1071 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);
1072 if (ret)
1073 goto err_out;
1074
1075 trf->special_fcn_reg1 = 0;
1076
1077 trf->iso_ctrl = 0xff;
1078 return 0;
1079
1080 err_out:
1081 dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
1082 return ret;
1083 }
1084
1085 static void trf7970a_switch_rf_off(struct trf7970a *trf)
1086 {
1087 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1088 (trf->state == TRF7970A_ST_RF_OFF))
1089 return;
1090
1091 dev_dbg(trf->dev, "Switching rf off\n");
1092
1093 trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
1094
1095 trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl);
1096
1097 trf->aborting = false;
1098 trf->state = TRF7970A_ST_RF_OFF;
1099
1100 pm_runtime_mark_last_busy(trf->dev);
1101 pm_runtime_put_autosuspend(trf->dev);
1102 }
1103
1104 static int trf7970a_switch_rf_on(struct trf7970a *trf)
1105 {
1106 int ret;
1107
1108 dev_dbg(trf->dev, "Switching rf on\n");
1109
1110 pm_runtime_get_sync(trf->dev);
1111
1112 if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */
1113 dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__,
1114 trf->state);
1115 return -EINVAL;
1116 }
1117
1118 ret = trf7970a_init(trf);
1119 if (ret) {
1120 dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret);
1121 return ret;
1122 }
1123
1124 trf->state = TRF7970A_ST_IDLE;
1125
1126 return 0;
1127 }
1128
1129 static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
1130 {
1131 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1132 int ret = 0;
1133
1134 dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on);
1135
1136 mutex_lock(&trf->lock);
1137
1138 if (on) {
1139 switch (trf->state) {
1140 case TRF7970A_ST_PWR_OFF:
1141 case TRF7970A_ST_RF_OFF:
1142 ret = trf7970a_switch_rf_on(trf);
1143 break;
1144 case TRF7970A_ST_IDLE:
1145 case TRF7970A_ST_IDLE_RX_BLOCKED:
1146 break;
1147 default:
1148 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1149 __func__, trf->state, on);
1150 trf7970a_switch_rf_off(trf);
1151 ret = -EINVAL;
1152 }
1153 } else {
1154 switch (trf->state) {
1155 case TRF7970A_ST_PWR_OFF:
1156 case TRF7970A_ST_RF_OFF:
1157 break;
1158 default:
1159 dev_err(trf->dev, "%s - Invalid request: %d %d\n",
1160 __func__, trf->state, on);
1161 ret = -EINVAL;
1162 /* FALLTHROUGH */
1163 case TRF7970A_ST_IDLE:
1164 case TRF7970A_ST_IDLE_RX_BLOCKED:
1165 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1166 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1167 trf7970a_switch_rf_off(trf);
1168 }
1169 }
1170
1171 mutex_unlock(&trf->lock);
1172 return ret;
1173 }
1174
1175 static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
1176 {
1177 int ret = 0;
1178
1179 dev_dbg(trf->dev, "rf technology: %d\n", tech);
1180
1181 switch (tech) {
1182 case NFC_DIGITAL_RF_TECH_106A:
1183 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
1184 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
1185 trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
1186 break;
1187 case NFC_DIGITAL_RF_TECH_106B:
1188 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;
1189 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
1190 trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
1191 break;
1192 case NFC_DIGITAL_RF_TECH_212F:
1193 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;
1194 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
1195 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
1196 break;
1197 case NFC_DIGITAL_RF_TECH_424F:
1198 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;
1199 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
1200 trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
1201 break;
1202 case NFC_DIGITAL_RF_TECH_ISO15693:
1203 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1204 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
1205 trf->guard_time = TRF7970A_GUARD_TIME_15693;
1206 break;
1207 default:
1208 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1209 return -EINVAL;
1210 }
1211
1212 trf->technology = tech;
1213
1214 /* If in initiator mode and not changing the RF tech due to a
1215 * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from
1216 * trf7970a_init()), clear the NFC Target Detection Level register
1217 * due to erratum.
1218 */
1219 if (trf->iso_ctrl == 0xff)
1220 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
1221
1222 return ret;
1223 }
1224
1225 static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)
1226 {
1227 int ret;
1228 u8 rssi;
1229
1230 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1231 trf->chip_status_ctrl | TRF7970A_CHIP_STATUS_REC_ON);
1232 if (ret)
1233 return ret;
1234
1235 ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);
1236 if (ret)
1237 return ret;
1238
1239 usleep_range(50, 60);
1240
1241 ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi);
1242 if (ret)
1243 return ret;
1244
1245 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1246 trf->chip_status_ctrl);
1247 if (ret)
1248 return ret;
1249
1250 if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK)
1251 *is_rf_field = true;
1252 else
1253 *is_rf_field = false;
1254
1255 return 0;
1256 }
1257
1258 static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)
1259 {
1260 u8 iso_ctrl = trf->iso_ctrl_tech;
1261 bool is_rf_field = false;
1262 int ret;
1263
1264 dev_dbg(trf->dev, "framing: %d\n", framing);
1265
1266 switch (framing) {
1267 case NFC_DIGITAL_FRAMING_NFCA_SHORT:
1268 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1269 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1270 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1271 break;
1272 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1273 case NFC_DIGITAL_FRAMING_NFCA_T4T:
1274 case NFC_DIGITAL_FRAMING_NFCB:
1275 case NFC_DIGITAL_FRAMING_NFCB_T4T:
1276 case NFC_DIGITAL_FRAMING_NFCF:
1277 case NFC_DIGITAL_FRAMING_NFCF_T3T:
1278 case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
1279 case NFC_DIGITAL_FRAMING_ISO15693_T5T:
1280 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1281 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1282 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1283 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1284 break;
1285 case NFC_DIGITAL_FRAMING_NFCA_T2T:
1286 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1287 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1288 break;
1289 default:
1290 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1291 return -EINVAL;
1292 }
1293
1294 trf->framing = framing;
1295
1296 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1297 ret = trf7970a_is_rf_field(trf, &is_rf_field);
1298 if (ret)
1299 return ret;
1300
1301 if (is_rf_field)
1302 return -EBUSY;
1303 }
1304
1305 if (iso_ctrl != trf->iso_ctrl) {
1306 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1307 if (ret)
1308 return ret;
1309
1310 trf->iso_ctrl = iso_ctrl;
1311
1312 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1313 trf->modulator_sys_clk_ctrl);
1314 if (ret)
1315 return ret;
1316 }
1317
1318 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1319 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1320 trf->chip_status_ctrl |
1321 TRF7970A_CHIP_STATUS_RF_ON);
1322 if (ret)
1323 return ret;
1324
1325 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1326
1327 usleep_range(trf->guard_time, trf->guard_time + 1000);
1328 }
1329
1330 return 0;
1331 }
1332
1333 static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,
1334 int param)
1335 {
1336 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1337 int ret;
1338
1339 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1340
1341 mutex_lock(&trf->lock);
1342
1343 trf->is_initiator = true;
1344
1345 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1346 (trf->state == TRF7970A_ST_RF_OFF)) {
1347 ret = trf7970a_switch_rf_on(trf);
1348 if (ret)
1349 goto err_unlock;
1350 }
1351
1352 switch (type) {
1353 case NFC_DIGITAL_CONFIG_RF_TECH:
1354 ret = trf7970a_in_config_rf_tech(trf, param);
1355 break;
1356 case NFC_DIGITAL_CONFIG_FRAMING:
1357 ret = trf7970a_in_config_framing(trf, param);
1358 break;
1359 default:
1360 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1361 ret = -EINVAL;
1362 }
1363
1364 err_unlock:
1365 mutex_unlock(&trf->lock);
1366 return ret;
1367 }
1368
1369 static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
1370 {
1371 switch (cmd) {
1372 case ISO15693_CMD_WRITE_SINGLE_BLOCK:
1373 case ISO15693_CMD_LOCK_BLOCK:
1374 case ISO15693_CMD_WRITE_MULTIPLE_BLOCK:
1375 case ISO15693_CMD_WRITE_AFI:
1376 case ISO15693_CMD_LOCK_AFI:
1377 case ISO15693_CMD_WRITE_DSFID:
1378 case ISO15693_CMD_LOCK_DSFID:
1379 return 1;
1380 break;
1381 default:
1382 return 0;
1383 }
1384 }
1385
1386 static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
1387 {
1388 u8 *req = skb->data;
1389 u8 special_fcn_reg1, iso_ctrl;
1390 int ret;
1391
1392 trf->issue_eof = false;
1393
1394 /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in
1395 * special functions register 1 is cleared; otherwise, its a write or
1396 * sector select command and '4_bit_RX' must be set.
1397 *
1398 * When issuing an ISO 15693 command, inspect the flags byte to see
1399 * what speed to use. Also, remember if the OPTION flag is set on
1400 * a Type 5 write or lock command so the driver will know that it
1401 * has to send an EOF in order to get a response.
1402 */
1403 if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) &&
1404 (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {
1405 if (req[0] == NFC_T2T_CMD_READ)
1406 special_fcn_reg1 = 0;
1407 else
1408 special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX;
1409
1410 if (special_fcn_reg1 != trf->special_fcn_reg1) {
1411 ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,
1412 special_fcn_reg1);
1413 if (ret)
1414 return ret;
1415
1416 trf->special_fcn_reg1 = special_fcn_reg1;
1417 }
1418 } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) {
1419 iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;
1420
1421 switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) {
1422 case 0x00:
1423 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662;
1424 break;
1425 case ISO15693_REQ_FLAG_SUB_CARRIER:
1426 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a;
1427 break;
1428 case ISO15693_REQ_FLAG_DATA_RATE:
1429 iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
1430 break;
1431 case (ISO15693_REQ_FLAG_SUB_CARRIER |
1432 ISO15693_REQ_FLAG_DATA_RATE):
1433 iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669;
1434 break;
1435 }
1436
1437 if (iso_ctrl != trf->iso_ctrl) {
1438 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1439 if (ret)
1440 return ret;
1441
1442 trf->iso_ctrl = iso_ctrl;
1443 }
1444
1445 if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) {
1446 if (trf7970a_is_iso15693_write_or_lock(req[1]) &&
1447 (req[0] & ISO15693_REQ_FLAG_OPTION))
1448 trf->issue_eof = true;
1449 else if ((trf->quirks &
1450 TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) &&
1451 (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK))
1452 trf->adjust_resp_len = true;
1453 }
1454 }
1455
1456 return 0;
1457 }
1458
1459 static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,
1460 struct sk_buff *skb, u16 timeout,
1461 nfc_digital_cmd_complete_t cb, void *arg)
1462 {
1463 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1464 u8 prefix[5];
1465 unsigned int len;
1466 int ret;
1467 u8 status;
1468
1469 dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
1470 trf->state, timeout, skb->len);
1471
1472 if (skb->len > TRF7970A_TX_MAX)
1473 return -EINVAL;
1474
1475 mutex_lock(&trf->lock);
1476
1477 if ((trf->state != TRF7970A_ST_IDLE) &&
1478 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1479 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1480 trf->state);
1481 ret = -EIO;
1482 goto out_err;
1483 }
1484
1485 if (trf->aborting) {
1486 dev_dbg(trf->dev, "Abort process complete\n");
1487 trf->aborting = false;
1488 ret = -ECANCELED;
1489 goto out_err;
1490 }
1491
1492 if (timeout) {
1493 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1494 GFP_KERNEL);
1495 if (!trf->rx_skb) {
1496 dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1497 ret = -ENOMEM;
1498 goto out_err;
1499 }
1500 }
1501
1502 if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) {
1503 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1504 if (ret)
1505 goto out_err;
1506
1507 trf->state = TRF7970A_ST_IDLE;
1508 }
1509
1510 if (trf->is_initiator) {
1511 ret = trf7970a_per_cmd_config(trf, skb);
1512 if (ret)
1513 goto out_err;
1514 }
1515
1516 trf->ddev = ddev;
1517 trf->tx_skb = skb;
1518 trf->cb = cb;
1519 trf->cb_arg = arg;
1520 trf->timeout = timeout;
1521 trf->ignore_timeout = false;
1522
1523 len = skb->len;
1524
1525 /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
1526 * on what the current framing is, the address of the TX length byte 1
1527 * register (0x1d), and the 2 byte length of the data to be transmitted.
1528 * That totals 5 bytes.
1529 */
1530 prefix[0] = TRF7970A_CMD_BIT_CTRL |
1531 TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET);
1532 prefix[1] = TRF7970A_CMD_BIT_CTRL |
1533 TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd);
1534 prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1;
1535
1536 if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {
1537 prefix[3] = 0x00;
1538 prefix[4] = 0x0f; /* 7 bits */
1539 } else {
1540 prefix[3] = (len & 0xf00) >> 4;
1541 prefix[3] |= ((len & 0xf0) >> 4);
1542 prefix[4] = ((len & 0x0f) << 4);
1543 }
1544
1545 len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
1546
1547 /* Clear possible spurious interrupt */
1548 ret = trf7970a_read_irqstatus(trf, &status);
1549 if (ret)
1550 goto out_err;
1551
1552 ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));
1553 if (ret) {
1554 kfree_skb(trf->rx_skb);
1555 trf->rx_skb = NULL;
1556 }
1557
1558 out_err:
1559 mutex_unlock(&trf->lock);
1560 return ret;
1561 }
1562
1563 static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)
1564 {
1565 int ret = 0;
1566
1567 dev_dbg(trf->dev, "rf technology: %d\n", tech);
1568
1569 switch (tech) {
1570 case NFC_DIGITAL_RF_TECH_106A:
1571 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1572 TRF7970A_ISO_CTRL_NFC_CE |
1573 TRF7970A_ISO_CTRL_NFC_CE_14443A;
1574 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK;
1575 break;
1576 case NFC_DIGITAL_RF_TECH_212F:
1577 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1578 TRF7970A_ISO_CTRL_NFC_NFCF_212;
1579 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
1580 break;
1581 case NFC_DIGITAL_RF_TECH_424F:
1582 trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
1583 TRF7970A_ISO_CTRL_NFC_NFCF_424;
1584 trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_ASK10;
1585 break;
1586 default:
1587 dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
1588 return -EINVAL;
1589 }
1590
1591 trf->technology = tech;
1592
1593 /* Normally we write the ISO_CTRL register in
1594 * trf7970a_tg_config_framing() because the framing can change
1595 * the value written. However, when sending a PSL RES,
1596 * digital_tg_send_psl_res_complete() doesn't call
1597 * trf7970a_tg_config_framing() so we must write the register
1598 * here.
1599 */
1600 if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) &&
1601 (trf->iso_ctrl_tech != trf->iso_ctrl)) {
1602 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
1603 trf->iso_ctrl_tech);
1604
1605 trf->iso_ctrl = trf->iso_ctrl_tech;
1606 }
1607
1608 return ret;
1609 }
1610
1611 /* Since this is a target routine, several of the framing calls are
1612 * made between receiving the request and sending the response so they
1613 * should take effect until after the response is sent. This is accomplished
1614 * by skipping the ISO_CTRL register write here and doing it in the interrupt
1615 * handler.
1616 */
1617 static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing)
1618 {
1619 u8 iso_ctrl = trf->iso_ctrl_tech;
1620 int ret;
1621
1622 dev_dbg(trf->dev, "framing: %d\n", framing);
1623
1624 switch (framing) {
1625 case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
1626 trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
1627 iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
1628 break;
1629 case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
1630 case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
1631 case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
1632 /* These ones are applied in the interrupt handler */
1633 iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */
1634 break;
1635 case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
1636 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1637 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1638 break;
1639 case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED:
1640 trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
1641 iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
1642 break;
1643 default:
1644 dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
1645 return -EINVAL;
1646 }
1647
1648 trf->framing = framing;
1649
1650 if (iso_ctrl != trf->iso_ctrl) {
1651 ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
1652 if (ret)
1653 return ret;
1654
1655 trf->iso_ctrl = iso_ctrl;
1656
1657 ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
1658 trf->modulator_sys_clk_ctrl);
1659 if (ret)
1660 return ret;
1661 }
1662
1663 if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
1664 ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
1665 trf->chip_status_ctrl |
1666 TRF7970A_CHIP_STATUS_RF_ON);
1667 if (ret)
1668 return ret;
1669
1670 trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
1671 }
1672
1673 return 0;
1674 }
1675
1676 static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
1677 int param)
1678 {
1679 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1680 int ret;
1681
1682 dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
1683
1684 mutex_lock(&trf->lock);
1685
1686 trf->is_initiator = false;
1687
1688 if ((trf->state == TRF7970A_ST_PWR_OFF) ||
1689 (trf->state == TRF7970A_ST_RF_OFF)) {
1690 ret = trf7970a_switch_rf_on(trf);
1691 if (ret)
1692 goto err_unlock;
1693 }
1694
1695 switch (type) {
1696 case NFC_DIGITAL_CONFIG_RF_TECH:
1697 ret = trf7970a_tg_config_rf_tech(trf, param);
1698 break;
1699 case NFC_DIGITAL_CONFIG_FRAMING:
1700 ret = trf7970a_tg_config_framing(trf, param);
1701 break;
1702 default:
1703 dev_dbg(trf->dev, "Unknown type: %d\n", type);
1704 ret = -EINVAL;
1705 }
1706
1707 err_unlock:
1708 mutex_unlock(&trf->lock);
1709 return ret;
1710 }
1711
1712 static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1713 nfc_digital_cmd_complete_t cb, void *arg, bool mode_detect)
1714 {
1715 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1716 int ret;
1717
1718 mutex_lock(&trf->lock);
1719
1720 if ((trf->state != TRF7970A_ST_IDLE) &&
1721 (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
1722 dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
1723 trf->state);
1724 ret = -EIO;
1725 goto out_err;
1726 }
1727
1728 if (trf->aborting) {
1729 dev_dbg(trf->dev, "Abort process complete\n");
1730 trf->aborting = false;
1731 ret = -ECANCELED;
1732 goto out_err;
1733 }
1734
1735 trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
1736 GFP_KERNEL);
1737 if (!trf->rx_skb) {
1738 dev_dbg(trf->dev, "Can't alloc rx_skb\n");
1739 ret = -ENOMEM;
1740 goto out_err;
1741 }
1742
1743 ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS,
1744 TRF7970A_RX_SPECIAL_SETTINGS_HBT |
1745 TRF7970A_RX_SPECIAL_SETTINGS_M848 |
1746 TRF7970A_RX_SPECIAL_SETTINGS_C424 |
1747 TRF7970A_RX_SPECIAL_SETTINGS_C212);
1748 if (ret)
1749 goto out_err;
1750
1751 ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
1752 TRF7970A_REG_IO_CTRL_VRS(0x1));
1753 if (ret)
1754 goto out_err;
1755
1756 ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL,
1757 TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3));
1758 if (ret)
1759 goto out_err;
1760
1761 ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL,
1762 TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7));
1763 if (ret)
1764 goto out_err;
1765
1766 trf->ddev = ddev;
1767 trf->cb = cb;
1768 trf->cb_arg = arg;
1769 trf->timeout = timeout;
1770 trf->ignore_timeout = false;
1771
1772 ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
1773 if (ret)
1774 goto out_err;
1775
1776 trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD :
1777 TRF7970A_ST_LISTENING;
1778
1779 schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
1780
1781 out_err:
1782 mutex_unlock(&trf->lock);
1783 return ret;
1784 }
1785
1786 static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
1787 nfc_digital_cmd_complete_t cb, void *arg)
1788 {
1789 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1790
1791 dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n",
1792 trf->state, timeout);
1793
1794 return _trf7970a_tg_listen(ddev, timeout, cb, arg, false);
1795 }
1796
1797 static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev,
1798 u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
1799 {
1800 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1801 int ret;
1802
1803 dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n",
1804 trf->state, timeout);
1805
1806 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
1807 NFC_DIGITAL_RF_TECH_106A);
1808 if (ret)
1809 return ret;
1810
1811 ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1812 NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
1813 if (ret)
1814 return ret;
1815
1816 return _trf7970a_tg_listen(ddev, timeout, cb, arg, true);
1817 }
1818
1819 static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech)
1820 {
1821 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1822
1823 dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n",
1824 trf->state, trf->md_rf_tech);
1825
1826 *rf_tech = trf->md_rf_tech;
1827
1828 return 0;
1829 }
1830
1831 static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)
1832 {
1833 struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
1834
1835 dev_dbg(trf->dev, "Abort process initiated\n");
1836
1837 mutex_lock(&trf->lock);
1838
1839 switch (trf->state) {
1840 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1841 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1842 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1843 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
1844 trf->aborting = true;
1845 break;
1846 case TRF7970A_ST_LISTENING:
1847 trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work);
1848 trf7970a_send_err_upstream(trf, -ECANCELED);
1849 dev_dbg(trf->dev, "Abort process complete\n");
1850 break;
1851 default:
1852 break;
1853 }
1854
1855 mutex_unlock(&trf->lock);
1856 }
1857
1858 static struct nfc_digital_ops trf7970a_nfc_ops = {
1859 .in_configure_hw = trf7970a_in_configure_hw,
1860 .in_send_cmd = trf7970a_send_cmd,
1861 .tg_configure_hw = trf7970a_tg_configure_hw,
1862 .tg_send_cmd = trf7970a_send_cmd,
1863 .tg_listen = trf7970a_tg_listen,
1864 .tg_listen_md = trf7970a_tg_listen_md,
1865 .tg_get_rf_tech = trf7970a_tg_get_rf_tech,
1866 .switch_rf = trf7970a_switch_rf,
1867 .abort_cmd = trf7970a_abort_cmd,
1868 };
1869
1870 static int trf7970a_power_up(struct trf7970a *trf)
1871 {
1872 int ret;
1873
1874 dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state);
1875
1876 if (trf->state != TRF7970A_ST_PWR_OFF)
1877 return 0;
1878
1879 ret = regulator_enable(trf->regulator);
1880 if (ret) {
1881 dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret);
1882 return ret;
1883 }
1884
1885 usleep_range(5000, 6000);
1886
1887 if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) {
1888 gpio_set_value(trf->en2_gpio, 1);
1889 usleep_range(1000, 2000);
1890 }
1891
1892 gpio_set_value(trf->en_gpio, 1);
1893
1894 usleep_range(20000, 21000);
1895
1896 trf->state = TRF7970A_ST_RF_OFF;
1897
1898 return 0;
1899 }
1900
1901 static int trf7970a_power_down(struct trf7970a *trf)
1902 {
1903 int ret;
1904
1905 dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state);
1906
1907 if (trf->state == TRF7970A_ST_PWR_OFF)
1908 return 0;
1909
1910 if (trf->state != TRF7970A_ST_RF_OFF) {
1911 dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n",
1912 trf->state);
1913 return -EBUSY;
1914 }
1915
1916 gpio_set_value(trf->en_gpio, 0);
1917 gpio_set_value(trf->en2_gpio, 0);
1918
1919 ret = regulator_disable(trf->regulator);
1920 if (ret)
1921 dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__,
1922 ret);
1923
1924 trf->state = TRF7970A_ST_PWR_OFF;
1925
1926 return ret;
1927 }
1928
1929 static int trf7970a_startup(struct trf7970a *trf)
1930 {
1931 int ret;
1932
1933 ret = trf7970a_power_up(trf);
1934 if (ret)
1935 return ret;
1936
1937 pm_runtime_set_active(trf->dev);
1938 pm_runtime_enable(trf->dev);
1939 pm_runtime_mark_last_busy(trf->dev);
1940
1941 return 0;
1942 }
1943
1944 static void trf7970a_shutdown(struct trf7970a *trf)
1945 {
1946 switch (trf->state) {
1947 case TRF7970A_ST_WAIT_FOR_TX_FIFO:
1948 case TRF7970A_ST_WAIT_FOR_RX_DATA:
1949 case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
1950 case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
1951 case TRF7970A_ST_LISTENING:
1952 trf7970a_send_err_upstream(trf, -ECANCELED);
1953 /* FALLTHROUGH */
1954 case TRF7970A_ST_IDLE:
1955 case TRF7970A_ST_IDLE_RX_BLOCKED:
1956 trf7970a_switch_rf_off(trf);
1957 break;
1958 default:
1959 break;
1960 }
1961
1962 pm_runtime_disable(trf->dev);
1963 pm_runtime_set_suspended(trf->dev);
1964
1965 trf7970a_power_down(trf);
1966 }
1967
1968 static int trf7970a_get_autosuspend_delay(struct device_node *np)
1969 {
1970 int autosuspend_delay, ret;
1971
1972 ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay);
1973 if (ret)
1974 autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY;
1975
1976 return autosuspend_delay;
1977 }
1978
1979 static int trf7970a_get_vin_voltage_override(struct device_node *np,
1980 u32 *vin_uvolts)
1981 {
1982 return of_property_read_u32(np, "vin-voltage-override", vin_uvolts);
1983 }
1984
1985 static int trf7970a_probe(struct spi_device *spi)
1986 {
1987 struct device_node *np = spi->dev.of_node;
1988 struct trf7970a *trf;
1989 int uvolts, autosuspend_delay, ret;
1990
1991 if (!np) {
1992 dev_err(&spi->dev, "No Device Tree entry\n");
1993 return -EINVAL;
1994 }
1995
1996 trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL);
1997 if (!trf)
1998 return -ENOMEM;
1999
2000 trf->state = TRF7970A_ST_PWR_OFF;
2001 trf->dev = &spi->dev;
2002 trf->spi = spi;
2003
2004 spi->mode = SPI_MODE_1;
2005 spi->bits_per_word = 8;
2006
2007 ret = spi_setup(spi);
2008 if (ret < 0) {
2009 dev_err(trf->dev, "Can't set up SPI Communication\n");
2010 return ret;
2011 }
2012
2013 if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk"))
2014 trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE;
2015
2016 if (of_property_read_bool(np, "irq-status-read-quirk"))
2017 trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ;
2018
2019 /* There are two enable pins - both must be present */
2020 trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0);
2021 if (!gpio_is_valid(trf->en_gpio)) {
2022 dev_err(trf->dev, "No EN GPIO property\n");
2023 return trf->en_gpio;
2024 }
2025
2026 ret = devm_gpio_request_one(trf->dev, trf->en_gpio,
2027 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN");
2028 if (ret) {
2029 dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret);
2030 return ret;
2031 }
2032
2033 trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1);
2034 if (!gpio_is_valid(trf->en2_gpio)) {
2035 dev_err(trf->dev, "No EN2 GPIO property\n");
2036 return trf->en2_gpio;
2037 }
2038
2039 ret = devm_gpio_request_one(trf->dev, trf->en2_gpio,
2040 GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2");
2041 if (ret) {
2042 dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret);
2043 return ret;
2044 }
2045
2046 if (of_property_read_bool(np, "en2-rf-quirk"))
2047 trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
2048
2049 ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
2050 trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
2051 "trf7970a", trf);
2052 if (ret) {
2053 dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
2054 return ret;
2055 }
2056
2057 mutex_init(&trf->lock);
2058 INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
2059
2060 trf->regulator = devm_regulator_get(&spi->dev, "vin");
2061 if (IS_ERR(trf->regulator)) {
2062 ret = PTR_ERR(trf->regulator);
2063 dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
2064 goto err_destroy_lock;
2065 }
2066
2067 ret = regulator_enable(trf->regulator);
2068 if (ret) {
2069 dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
2070 goto err_destroy_lock;
2071 }
2072
2073 ret = trf7970a_get_vin_voltage_override(np, &uvolts);
2074 if (ret)
2075 uvolts = regulator_get_voltage(trf->regulator);
2076
2077 if (uvolts > 4000000)
2078 trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;
2079
2080 trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
2081 TRF7970A_SUPPORTED_PROTOCOLS,
2082 NFC_DIGITAL_DRV_CAPS_IN_CRC |
2083 NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 0);
2084 if (!trf->ddev) {
2085 dev_err(trf->dev, "Can't allocate NFC digital device\n");
2086 ret = -ENOMEM;
2087 goto err_disable_regulator;
2088 }
2089
2090 nfc_digital_set_parent_dev(trf->ddev, trf->dev);
2091 nfc_digital_set_drvdata(trf->ddev, trf);
2092 spi_set_drvdata(spi, trf);
2093
2094 autosuspend_delay = trf7970a_get_autosuspend_delay(np);
2095
2096 pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
2097 pm_runtime_use_autosuspend(trf->dev);
2098
2099 ret = trf7970a_startup(trf);
2100 if (ret)
2101 goto err_free_ddev;
2102
2103 ret = nfc_digital_register_device(trf->ddev);
2104 if (ret) {
2105 dev_err(trf->dev, "Can't register NFC digital device: %d\n",
2106 ret);
2107 goto err_shutdown;
2108 }
2109
2110 return 0;
2111
2112 err_shutdown:
2113 trf7970a_shutdown(trf);
2114 err_free_ddev:
2115 nfc_digital_free_device(trf->ddev);
2116 err_disable_regulator:
2117 regulator_disable(trf->regulator);
2118 err_destroy_lock:
2119 mutex_destroy(&trf->lock);
2120 return ret;
2121 }
2122
2123 static int trf7970a_remove(struct spi_device *spi)
2124 {
2125 struct trf7970a *trf = spi_get_drvdata(spi);
2126
2127 mutex_lock(&trf->lock);
2128
2129 trf7970a_shutdown(trf);
2130
2131 mutex_unlock(&trf->lock);
2132
2133 nfc_digital_unregister_device(trf->ddev);
2134 nfc_digital_free_device(trf->ddev);
2135
2136 regulator_disable(trf->regulator);
2137
2138 mutex_destroy(&trf->lock);
2139
2140 return 0;
2141 }
2142
2143 #ifdef CONFIG_PM_SLEEP
2144 static int trf7970a_suspend(struct device *dev)
2145 {
2146 struct spi_device *spi = to_spi_device(dev);
2147 struct trf7970a *trf = spi_get_drvdata(spi);
2148
2149 dev_dbg(dev, "Suspend\n");
2150
2151 mutex_lock(&trf->lock);
2152
2153 trf7970a_shutdown(trf);
2154
2155 mutex_unlock(&trf->lock);
2156
2157 return 0;
2158 }
2159
2160 static int trf7970a_resume(struct device *dev)
2161 {
2162 struct spi_device *spi = to_spi_device(dev);
2163 struct trf7970a *trf = spi_get_drvdata(spi);
2164 int ret;
2165
2166 dev_dbg(dev, "Resume\n");
2167
2168 mutex_lock(&trf->lock);
2169
2170 ret = trf7970a_startup(trf);
2171
2172 mutex_unlock(&trf->lock);
2173
2174 return ret;
2175 }
2176 #endif
2177
2178 #ifdef CONFIG_PM
2179 static int trf7970a_pm_runtime_suspend(struct device *dev)
2180 {
2181 struct spi_device *spi = to_spi_device(dev);
2182 struct trf7970a *trf = spi_get_drvdata(spi);
2183 int ret;
2184
2185 dev_dbg(dev, "Runtime suspend\n");
2186
2187 mutex_lock(&trf->lock);
2188
2189 ret = trf7970a_power_down(trf);
2190
2191 mutex_unlock(&trf->lock);
2192
2193 return ret;
2194 }
2195
2196 static int trf7970a_pm_runtime_resume(struct device *dev)
2197 {
2198 struct spi_device *spi = to_spi_device(dev);
2199 struct trf7970a *trf = spi_get_drvdata(spi);
2200 int ret;
2201
2202 dev_dbg(dev, "Runtime resume\n");
2203
2204 ret = trf7970a_power_up(trf);
2205 if (!ret)
2206 pm_runtime_mark_last_busy(dev);
2207
2208 return ret;
2209 }
2210 #endif
2211
2212 static const struct dev_pm_ops trf7970a_pm_ops = {
2213 SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
2214 SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
2215 trf7970a_pm_runtime_resume, NULL)
2216 };
2217
2218 static const struct of_device_id trf7970a_of_match[] = {
2219 { .compatible = "ti,trf7970a", },
2220 { /* sentinel */ },
2221 };
2222 MODULE_DEVICE_TABLE(of, trf7970a_of_match);
2223
2224 static const struct spi_device_id trf7970a_id_table[] = {
2225 { "trf7970a", 0 },
2226 { }
2227 };
2228 MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
2229
2230 static struct spi_driver trf7970a_spi_driver = {
2231 .probe = trf7970a_probe,
2232 .remove = trf7970a_remove,
2233 .id_table = trf7970a_id_table,
2234 .driver = {
2235 .name = "trf7970a",
2236 .of_match_table = of_match_ptr(trf7970a_of_match),
2237 .pm = &trf7970a_pm_ops,
2238 },
2239 };
2240
2241 module_spi_driver(trf7970a_spi_driver);
2242
2243 MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
2244 MODULE_LICENSE("GPL v2");
2245 MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");
Linux with added FPC-III support