1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * TI TRF7970a RFID/NFC Transceiver Driver |
4 | * |
5 | * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com |
6 | * |
7 | * Author: Erick Macias <emacias@ti.com> |
8 | * Author: Felipe Balbi <balbi@ti.com> |
9 | * Author: Mark A. Greer <mgreer@animalcreek.com> |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/device.h> |
14 | #include <linux/netdevice.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/pm_runtime.h> |
17 | #include <linux/nfc.h> |
18 | #include <linux/skbuff.h> |
19 | #include <linux/delay.h> |
20 | #include <linux/gpio/consumer.h> |
21 | #include <linux/of.h> |
22 | #include <linux/spi/spi.h> |
23 | #include <linux/regulator/consumer.h> |
24 | |
25 | #include <net/nfc/nfc.h> |
26 | #include <net/nfc/digital.h> |
27 | |
28 | /* There are 3 ways the host can communicate with the trf7970a: |
29 | * parallel mode, SPI with Slave Select (SS) mode, and SPI without |
30 | * SS mode. The driver only supports the two SPI modes. |
31 | * |
32 | * The trf7970a is very timing sensitive and the VIN, EN2, and EN |
33 | * pins must asserted in that order and with specific delays in between. |
34 | * The delays used in the driver were provided by TI and have been |
35 | * confirmed to work with this driver. There is a bug with the current |
36 | * version of the trf7970a that requires that EN2 remain low no matter |
37 | * what. If it goes high, it will generate an RF field even when in |
38 | * passive target mode. TI has indicated that the chip will work okay |
39 | * when EN2 is left low. The 'en2-rf-quirk' device tree property |
40 | * indicates that trf7970a currently being used has the erratum and |
41 | * that EN2 must be kept low. |
42 | * |
43 | * Timeouts are implemented using the delayed workqueue kernel facility. |
44 | * Timeouts are required so things don't hang when there is no response |
45 | * from the trf7970a (or tag). Using this mechanism creates a race with |
46 | * interrupts, however. That is, an interrupt and a timeout could occur |
47 | * closely enough together that one is blocked by the mutex while the other |
48 | * executes. When the timeout handler executes first and blocks the |
49 | * interrupt handler, it will eventually set the state to IDLE so the |
50 | * interrupt handler will check the state and exit with no harm done. |
51 | * When the interrupt handler executes first and blocks the timeout handler, |
52 | * the cancel_delayed_work() call will know that it didn't cancel the |
53 | * work item (i.e., timeout) and will return zero. That return code is |
54 | * used by the timer handler to indicate that it should ignore the timeout |
55 | * once its unblocked. |
56 | * |
57 | * Aborting an active command isn't as simple as it seems because the only |
58 | * way to abort a command that's already been sent to the tag is so turn |
59 | * off power to the tag. If we do that, though, we'd have to go through |
60 | * the entire anticollision procedure again but the digital layer doesn't |
61 | * support that. So, if an abort is received before trf7970a_send_cmd() |
62 | * has sent the command to the tag, it simply returns -ECANCELED. If the |
63 | * command has already been sent to the tag, then the driver continues |
64 | * normally and recieves the response data (or error) but just before |
65 | * sending the data upstream, it frees the rx_skb and sends -ECANCELED |
66 | * upstream instead. If the command failed, that error will be sent |
67 | * upstream. |
68 | * |
69 | * When recieving data from a tag and the interrupt status register has |
70 | * only the SRX bit set, it means that all of the data has been received |
71 | * (once what's in the fifo has been read). However, depending on timing |
72 | * an interrupt status with only the SRX bit set may not be recived. In |
73 | * those cases, the timeout mechanism is used to wait 20 ms in case more |
74 | * data arrives. After 20 ms, it is assumed that all of the data has been |
75 | * received and the accumulated rx data is sent upstream. The |
76 | * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose |
77 | * (i.e., it indicates that some data has been received but we're not sure |
78 | * if there is more coming so a timeout in this state means all data has |
79 | * been received and there isn't an error). The delay is 20 ms since delays |
80 | * of ~16 ms have been observed during testing. |
81 | * |
82 | * When transmitting a frame larger than the FIFO size (127 bytes), the |
83 | * driver will wait 20 ms for the FIFO to drain past the low-watermark |
84 | * and generate an interrupt. The low-watermark set to 32 bytes so the |
85 | * interrupt should fire after 127 - 32 = 95 bytes have been sent. At |
86 | * the lowest possible bit rate (6.62 kbps for 15693), it will take up |
87 | * to ~14.35 ms so 20 ms is used for the timeout. |
88 | * |
89 | * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. |
90 | * Having only 4 bits in the FIFO won't normally generate an interrupt so |
91 | * driver enables the '4_bit_RX' bit of the Special Functions register 1 |
92 | * to cause an interrupt in that case. Leaving that bit for a read command |
93 | * messes up the data returned so it is only enabled when the framing is |
94 | * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. |
95 | * Unfortunately, that means that the driver has to peek into tx frames |
96 | * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by |
97 | * the trf7970a_per_cmd_config() routine. |
98 | * |
99 | * ISO/IEC 15693 frames specify whether to use single or double sub-carrier |
100 | * frequencies and whether to use low or high data rates in the flags byte |
101 | * of the frame. This means that the driver has to peek at all 15693 frames |
102 | * to determine what speed to set the communication to. In addition, write |
103 | * and lock commands use the OPTION flag to indicate that an EOF must be |
104 | * sent to the tag before it will send its response. So the driver has to |
105 | * examine all frames for that reason too. |
106 | * |
107 | * It is unclear how long to wait before sending the EOF. According to the |
108 | * Note under Table 1-1 in section 1.6 of |
109 | * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least |
110 | * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long |
111 | * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain |
112 | * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to |
113 | * ensure the wait is long enough before sending the EOF. This seems to work |
114 | * reliably. |
115 | */ |
116 | |
117 | #define TRF7970A_SUPPORTED_PROTOCOLS \ |
118 | (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ |
119 | NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ |
120 | NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) |
121 | |
122 | #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ |
123 | #define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 |
124 | #define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 |
125 | |
126 | #define TRF7970A_RX_SKB_ALLOC_SIZE 256 |
127 | |
128 | #define TRF7970A_FIFO_SIZE 127 |
129 | |
130 | /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ |
131 | #define TRF7970A_TX_MAX (4096 - 1) |
132 | |
133 | #define TRF7970A_WAIT_FOR_TX_IRQ 20 |
134 | #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 |
135 | #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 |
136 | #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 |
137 | |
138 | /* Guard times for various RF technologies (in us) */ |
139 | #define TRF7970A_GUARD_TIME_NFCA 5000 |
140 | #define TRF7970A_GUARD_TIME_NFCB 5000 |
141 | #define TRF7970A_GUARD_TIME_NFCF 20000 |
142 | #define TRF7970A_GUARD_TIME_15693 1000 |
143 | |
144 | /* Quirks */ |
145 | /* Erratum: When reading IRQ Status register on trf7970a, we must issue a |
146 | * read continuous command for IRQ Status and Collision Position registers. |
147 | */ |
148 | #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) |
149 | #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) |
150 | |
151 | /* Direct commands */ |
152 | #define TRF7970A_CMD_IDLE 0x00 |
153 | #define TRF7970A_CMD_SOFT_INIT 0x03 |
154 | #define TRF7970A_CMD_RF_COLLISION 0x04 |
155 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 |
156 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 |
157 | #define TRF7970A_CMD_FIFO_RESET 0x0f |
158 | #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 |
159 | #define TRF7970A_CMD_TRANSMIT 0x11 |
160 | #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 |
161 | #define TRF7970A_CMD_DELAY_TRANSMIT 0x13 |
162 | #define TRF7970A_CMD_EOF 0x14 |
163 | #define TRF7970A_CMD_CLOSE_SLOT 0x15 |
164 | #define TRF7970A_CMD_BLOCK_RX 0x16 |
165 | #define TRF7970A_CMD_ENABLE_RX 0x17 |
166 | #define TRF7970A_CMD_TEST_INT_RF 0x18 |
167 | #define TRF7970A_CMD_TEST_EXT_RF 0x19 |
168 | #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a |
169 | |
170 | /* Bits determining whether its a direct command or register R/W, |
171 | * whether to use a continuous SPI transaction or not, and the actual |
172 | * direct cmd opcode or register address. |
173 | */ |
174 | #define TRF7970A_CMD_BIT_CTRL BIT(7) |
175 | #define TRF7970A_CMD_BIT_RW BIT(6) |
176 | #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) |
177 | #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) |
178 | |
179 | /* Registers addresses */ |
180 | #define TRF7970A_CHIP_STATUS_CTRL 0x00 |
181 | #define TRF7970A_ISO_CTRL 0x01 |
182 | #define TRF7970A_ISO14443B_TX_OPTIONS 0x02 |
183 | #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 |
184 | #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 |
185 | #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 |
186 | #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 |
187 | #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 |
188 | #define TRF7970A_RX_WAIT_TIME 0x08 |
189 | #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 |
190 | #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a |
191 | #define TRF7970A_REG_IO_CTRL 0x0b |
192 | #define TRF7970A_IRQ_STATUS 0x0c |
193 | #define TRF7970A_COLLISION_IRQ_MASK 0x0d |
194 | #define TRF7970A_COLLISION_POSITION 0x0e |
195 | #define 0x0f |
196 | #define TRF7970A_SPECIAL_FCN_REG1 0x10 |
197 | #define TRF7970A_SPECIAL_FCN_REG2 0x11 |
198 | #define TRF7970A_RAM1 0x12 |
199 | #define TRF7970A_RAM2 0x13 |
200 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 |
201 | #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 |
202 | #define TRF7970A_NFCID1 0x17 |
203 | #define TRF7970A_NFC_TARGET_LEVEL 0x18 |
204 | #define TRF79070A_NFC_TARGET_PROTOCOL 0x19 |
205 | #define TRF7970A_TEST_REGISTER1 0x1a |
206 | #define TRF7970A_TEST_REGISTER2 0x1b |
207 | #define TRF7970A_FIFO_STATUS 0x1c |
208 | #define TRF7970A_TX_LENGTH_BYTE1 0x1d |
209 | #define TRF7970A_TX_LENGTH_BYTE2 0x1e |
210 | #define TRF7970A_FIFO_IO_REGISTER 0x1f |
211 | |
212 | /* Chip Status Control Register Bits */ |
213 | #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) |
214 | #define TRF7970A_CHIP_STATUS_REC_ON BIT(1) |
215 | #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) |
216 | #define TRF7970A_CHIP_STATUS_PM_ON BIT(3) |
217 | #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) |
218 | #define TRF7970A_CHIP_STATUS_RF_ON BIT(5) |
219 | #define TRF7970A_CHIP_STATUS_DIRECT BIT(6) |
220 | #define TRF7970A_CHIP_STATUS_STBY BIT(7) |
221 | |
222 | /* ISO Control Register Bits */ |
223 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 |
224 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 |
225 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 |
226 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 |
227 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 |
228 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 |
229 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 |
230 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 |
231 | #define TRF7970A_ISO_CTRL_14443A_106 0x08 |
232 | #define TRF7970A_ISO_CTRL_14443A_212 0x09 |
233 | #define TRF7970A_ISO_CTRL_14443A_424 0x0a |
234 | #define TRF7970A_ISO_CTRL_14443A_848 0x0b |
235 | #define TRF7970A_ISO_CTRL_14443B_106 0x0c |
236 | #define TRF7970A_ISO_CTRL_14443B_212 0x0d |
237 | #define TRF7970A_ISO_CTRL_14443B_424 0x0e |
238 | #define TRF7970A_ISO_CTRL_14443B_848 0x0f |
239 | #define TRF7970A_ISO_CTRL_FELICA_212 0x1a |
240 | #define TRF7970A_ISO_CTRL_FELICA_424 0x1b |
241 | #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 |
242 | #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 |
243 | #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 |
244 | #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 |
245 | #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 |
246 | #define TRF7970A_ISO_CTRL_NFC_CE BIT(2) |
247 | #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) |
248 | #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) |
249 | #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) |
250 | #define TRF7970A_ISO_CTRL_RFID BIT(5) |
251 | #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) |
252 | #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ |
253 | |
254 | #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f |
255 | |
256 | /* Modulator and SYS_CLK Control Register Bits */ |
257 | #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) |
258 | #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) |
259 | #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) |
260 | #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) |
261 | #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) |
262 | #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) |
263 | #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) |
264 | #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) |
265 | #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) |
266 | #define TRF7970A_MODULATOR_EN_ANA BIT(3) |
267 | #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) |
268 | #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) |
269 | #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) |
270 | #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) |
271 | #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) |
272 | #define TRF7970A_MODULATOR_EN_OOK BIT(6) |
273 | #define TRF7970A_MODULATOR_27MHZ BIT(7) |
274 | |
275 | #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) |
276 | #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) |
277 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) |
278 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) |
279 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) |
280 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) |
281 | #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) |
282 | #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) |
283 | #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) |
284 | #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) |
285 | |
286 | #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) |
287 | #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) |
288 | #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) |
289 | #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) |
290 | |
291 | /* IRQ Status Register Bits */ |
292 | #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ |
293 | #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) |
294 | #define TRF7970A_IRQ_STATUS_COL BIT(1) |
295 | #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) |
296 | #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) |
297 | #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) |
298 | #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) |
299 | #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) |
300 | #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) |
301 | #define TRF7970A_IRQ_STATUS_FIFO BIT(5) |
302 | #define TRF7970A_IRQ_STATUS_SRX BIT(6) |
303 | #define TRF7970A_IRQ_STATUS_TX BIT(7) |
304 | |
305 | #define TRF7970A_IRQ_STATUS_ERROR \ |
306 | (TRF7970A_IRQ_STATUS_COL | \ |
307 | TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ |
308 | TRF7970A_IRQ_STATUS_PARITY_ERROR | \ |
309 | TRF7970A_IRQ_STATUS_CRC_ERROR) |
310 | |
311 | #define (BIT(2) | BIT(1) | BIT(0)) |
312 | #define (BIT(5) | BIT(4) | BIT(3)) |
313 | #define BIT(6) |
314 | |
315 | #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) |
316 | #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) |
317 | #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) |
318 | #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) |
319 | #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) |
320 | #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) |
321 | |
322 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) |
323 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) |
324 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) |
325 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) |
326 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 |
327 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 |
328 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 |
329 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 |
330 | |
331 | #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) |
332 | #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) |
333 | |
334 | #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) |
335 | #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) |
336 | #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) |
337 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) |
338 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) |
339 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) |
340 | |
341 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) |
342 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) |
343 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) |
344 | #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) |
345 | #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) |
346 | #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) |
347 | #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) |
348 | #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) |
349 | |
350 | #define TRF79070A_NFC_TARGET_PROTOCOL_106A \ |
351 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
352 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
353 | TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ |
354 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) |
355 | |
356 | #define TRF79070A_NFC_TARGET_PROTOCOL_106B \ |
357 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
358 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
359 | TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ |
360 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) |
361 | |
362 | #define TRF79070A_NFC_TARGET_PROTOCOL_212F \ |
363 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
364 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
365 | TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ |
366 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) |
367 | |
368 | #define TRF79070A_NFC_TARGET_PROTOCOL_424F \ |
369 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ |
370 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ |
371 | TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ |
372 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) |
373 | |
374 | #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) |
375 | |
376 | /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ |
377 | #define NFC_T2T_CMD_READ 0x30 |
378 | |
379 | /* ISO 15693 commands codes */ |
380 | #define ISO15693_CMD_INVENTORY 0x01 |
381 | #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 |
382 | #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 |
383 | #define ISO15693_CMD_LOCK_BLOCK 0x22 |
384 | #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 |
385 | #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 |
386 | #define ISO15693_CMD_SELECT 0x25 |
387 | #define ISO15693_CMD_RESET_TO_READY 0x26 |
388 | #define ISO15693_CMD_WRITE_AFI 0x27 |
389 | #define ISO15693_CMD_LOCK_AFI 0x28 |
390 | #define ISO15693_CMD_WRITE_DSFID 0x29 |
391 | #define ISO15693_CMD_LOCK_DSFID 0x2a |
392 | #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b |
393 | #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c |
394 | |
395 | /* ISO 15693 request and response flags */ |
396 | #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) |
397 | #define ISO15693_REQ_FLAG_DATA_RATE BIT(1) |
398 | #define ISO15693_REQ_FLAG_INVENTORY BIT(2) |
399 | #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) |
400 | #define ISO15693_REQ_FLAG_SELECT BIT(4) |
401 | #define ISO15693_REQ_FLAG_AFI BIT(4) |
402 | #define ISO15693_REQ_FLAG_ADDRESS BIT(5) |
403 | #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) |
404 | #define ISO15693_REQ_FLAG_OPTION BIT(6) |
405 | |
406 | #define ISO15693_REQ_FLAG_SPEED_MASK \ |
407 | (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) |
408 | |
409 | enum trf7970a_state { |
410 | TRF7970A_ST_PWR_OFF, |
411 | TRF7970A_ST_RF_OFF, |
412 | TRF7970A_ST_IDLE, |
413 | TRF7970A_ST_IDLE_RX_BLOCKED, |
414 | TRF7970A_ST_WAIT_FOR_TX_FIFO, |
415 | TRF7970A_ST_WAIT_FOR_RX_DATA, |
416 | TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, |
417 | TRF7970A_ST_WAIT_TO_ISSUE_EOF, |
418 | TRF7970A_ST_LISTENING, |
419 | TRF7970A_ST_LISTENING_MD, |
420 | TRF7970A_ST_MAX |
421 | }; |
422 | |
423 | struct trf7970a { |
424 | enum trf7970a_state state; |
425 | struct device *dev; |
426 | struct spi_device *spi; |
427 | struct regulator *regulator; |
428 | struct nfc_digital_dev *ddev; |
429 | u32 quirks; |
430 | bool is_initiator; |
431 | bool aborting; |
432 | struct sk_buff *tx_skb; |
433 | struct sk_buff *rx_skb; |
434 | nfc_digital_cmd_complete_t cb; |
435 | void *cb_arg; |
436 | u8 chip_status_ctrl; |
437 | u8 iso_ctrl; |
438 | u8 iso_ctrl_tech; |
439 | u8 modulator_sys_clk_ctrl; |
440 | u8 special_fcn_reg1; |
441 | u8 io_ctrl; |
442 | unsigned int guard_time; |
443 | int technology; |
444 | int framing; |
445 | u8 md_rf_tech; |
446 | u8 tx_cmd; |
447 | bool issue_eof; |
448 | struct gpio_desc *en_gpiod; |
449 | struct gpio_desc *en2_gpiod; |
450 | struct mutex lock; |
451 | unsigned int timeout; |
452 | bool ignore_timeout; |
453 | struct delayed_work timeout_work; |
454 | }; |
455 | |
456 | static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) |
457 | { |
458 | u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); |
459 | int ret; |
460 | |
461 | dev_dbg(trf->dev, "cmd: 0x%x\n" , cmd); |
462 | |
463 | ret = spi_write(spi: trf->spi, buf: &cmd, len: 1); |
464 | if (ret) |
465 | dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n" , __func__, cmd, |
466 | ret); |
467 | return ret; |
468 | } |
469 | |
470 | static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) |
471 | { |
472 | u8 addr = TRF7970A_CMD_BIT_RW | reg; |
473 | int ret; |
474 | |
475 | ret = spi_write_then_read(spi: trf->spi, txbuf: &addr, n_tx: 1, rxbuf: val, n_rx: 1); |
476 | if (ret) |
477 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n" , __func__, addr, |
478 | ret); |
479 | |
480 | dev_dbg(trf->dev, "read(0x%x): 0x%x\n" , addr, *val); |
481 | |
482 | return ret; |
483 | } |
484 | |
485 | static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, |
486 | size_t len) |
487 | { |
488 | u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; |
489 | struct spi_transfer t[2]; |
490 | struct spi_message m; |
491 | int ret; |
492 | |
493 | dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n" , addr, len); |
494 | |
495 | spi_message_init(m: &m); |
496 | |
497 | memset(&t, 0, sizeof(t)); |
498 | |
499 | t[0].tx_buf = &addr; |
500 | t[0].len = sizeof(addr); |
501 | spi_message_add_tail(t: &t[0], m: &m); |
502 | |
503 | t[1].rx_buf = buf; |
504 | t[1].len = len; |
505 | spi_message_add_tail(t: &t[1], m: &m); |
506 | |
507 | ret = spi_sync(spi: trf->spi, message: &m); |
508 | if (ret) |
509 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n" , __func__, addr, |
510 | ret); |
511 | return ret; |
512 | } |
513 | |
514 | static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) |
515 | { |
516 | u8 buf[2] = { reg, val }; |
517 | int ret; |
518 | |
519 | dev_dbg(trf->dev, "write(0x%x): 0x%x\n" , reg, val); |
520 | |
521 | ret = spi_write(spi: trf->spi, buf, len: 2); |
522 | if (ret) |
523 | dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n" , __func__, |
524 | buf[0], buf[1], ret); |
525 | |
526 | return ret; |
527 | } |
528 | |
529 | static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) |
530 | { |
531 | int ret; |
532 | u8 buf[2]; |
533 | u8 addr; |
534 | |
535 | addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; |
536 | |
537 | if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { |
538 | addr |= TRF7970A_CMD_BIT_CONTINUOUS; |
539 | ret = spi_write_then_read(spi: trf->spi, txbuf: &addr, n_tx: 1, rxbuf: buf, n_rx: 2); |
540 | } else { |
541 | ret = spi_write_then_read(spi: trf->spi, txbuf: &addr, n_tx: 1, rxbuf: buf, n_rx: 1); |
542 | } |
543 | |
544 | if (ret) |
545 | dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n" , |
546 | __func__, ret); |
547 | else |
548 | *status = buf[0]; |
549 | |
550 | return ret; |
551 | } |
552 | |
553 | static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) |
554 | { |
555 | int ret; |
556 | u8 buf[2]; |
557 | u8 addr; |
558 | |
559 | addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | |
560 | TRF7970A_CMD_BIT_CONTINUOUS; |
561 | |
562 | ret = spi_write_then_read(spi: trf->spi, txbuf: &addr, n_tx: 1, rxbuf: buf, n_rx: 2); |
563 | if (ret) |
564 | dev_err(trf->dev, "%s - target_proto: Read failed: %d\n" , |
565 | __func__, ret); |
566 | else |
567 | *target_proto = buf[0]; |
568 | |
569 | return ret; |
570 | } |
571 | |
572 | static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) |
573 | { |
574 | int ret; |
575 | u8 target_proto, tech; |
576 | |
577 | ret = trf7970a_read_target_proto(trf, target_proto: &target_proto); |
578 | if (ret) |
579 | return ret; |
580 | |
581 | switch (target_proto) { |
582 | case TRF79070A_NFC_TARGET_PROTOCOL_106A: |
583 | tech = NFC_DIGITAL_RF_TECH_106A; |
584 | break; |
585 | case TRF79070A_NFC_TARGET_PROTOCOL_106B: |
586 | tech = NFC_DIGITAL_RF_TECH_106B; |
587 | break; |
588 | case TRF79070A_NFC_TARGET_PROTOCOL_212F: |
589 | tech = NFC_DIGITAL_RF_TECH_212F; |
590 | break; |
591 | case TRF79070A_NFC_TARGET_PROTOCOL_424F: |
592 | tech = NFC_DIGITAL_RF_TECH_424F; |
593 | break; |
594 | default: |
595 | dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n" , |
596 | __func__, target_proto); |
597 | return -EIO; |
598 | } |
599 | |
600 | *rf_tech = tech; |
601 | |
602 | return ret; |
603 | } |
604 | |
605 | static void trf7970a_send_upstream(struct trf7970a *trf) |
606 | { |
607 | dev_kfree_skb_any(skb: trf->tx_skb); |
608 | trf->tx_skb = NULL; |
609 | |
610 | if (trf->rx_skb && !IS_ERR(ptr: trf->rx_skb) && !trf->aborting) |
611 | print_hex_dump_debug("trf7970a rx data: " , DUMP_PREFIX_NONE, |
612 | 16, 1, trf->rx_skb->data, trf->rx_skb->len, |
613 | false); |
614 | |
615 | trf->state = TRF7970A_ST_IDLE; |
616 | |
617 | if (trf->aborting) { |
618 | dev_dbg(trf->dev, "Abort process complete\n" ); |
619 | |
620 | if (!IS_ERR(ptr: trf->rx_skb)) { |
621 | kfree_skb(skb: trf->rx_skb); |
622 | trf->rx_skb = ERR_PTR(error: -ECANCELED); |
623 | } |
624 | |
625 | trf->aborting = false; |
626 | } |
627 | |
628 | trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); |
629 | |
630 | trf->rx_skb = NULL; |
631 | } |
632 | |
633 | static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) |
634 | { |
635 | dev_dbg(trf->dev, "Error - state: %d, errno: %d\n" , trf->state, errno); |
636 | |
637 | cancel_delayed_work(dwork: &trf->timeout_work); |
638 | |
639 | kfree_skb(skb: trf->rx_skb); |
640 | trf->rx_skb = ERR_PTR(error: errno); |
641 | |
642 | trf7970a_send_upstream(trf); |
643 | } |
644 | |
645 | static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, |
646 | unsigned int len, const u8 *prefix, |
647 | unsigned int prefix_len) |
648 | { |
649 | struct spi_transfer t[2]; |
650 | struct spi_message m; |
651 | unsigned int timeout; |
652 | int ret; |
653 | |
654 | print_hex_dump_debug("trf7970a tx data: " , DUMP_PREFIX_NONE, |
655 | 16, 1, skb->data, len, false); |
656 | |
657 | spi_message_init(m: &m); |
658 | |
659 | memset(&t, 0, sizeof(t)); |
660 | |
661 | t[0].tx_buf = prefix; |
662 | t[0].len = prefix_len; |
663 | spi_message_add_tail(t: &t[0], m: &m); |
664 | |
665 | t[1].tx_buf = skb->data; |
666 | t[1].len = len; |
667 | spi_message_add_tail(t: &t[1], m: &m); |
668 | |
669 | ret = spi_sync(spi: trf->spi, message: &m); |
670 | if (ret) { |
671 | dev_err(trf->dev, "%s - Can't send tx data: %d\n" , __func__, |
672 | ret); |
673 | return ret; |
674 | } |
675 | |
676 | skb_pull(skb, len); |
677 | |
678 | if (skb->len > 0) { |
679 | trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; |
680 | timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; |
681 | } else { |
682 | if (trf->issue_eof) { |
683 | trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; |
684 | timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; |
685 | } else { |
686 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; |
687 | |
688 | if (!trf->timeout) |
689 | timeout = TRF7970A_WAIT_FOR_TX_IRQ; |
690 | else |
691 | timeout = trf->timeout; |
692 | } |
693 | } |
694 | |
695 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n" , timeout, |
696 | trf->state); |
697 | |
698 | schedule_delayed_work(dwork: &trf->timeout_work, delay: msecs_to_jiffies(m: timeout)); |
699 | |
700 | return 0; |
701 | } |
702 | |
703 | static void trf7970a_fill_fifo(struct trf7970a *trf) |
704 | { |
705 | struct sk_buff *skb = trf->tx_skb; |
706 | unsigned int len; |
707 | int ret; |
708 | u8 fifo_bytes; |
709 | u8 prefix; |
710 | |
711 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, val: &fifo_bytes); |
712 | if (ret) { |
713 | trf7970a_send_err_upstream(trf, errno: ret); |
714 | return; |
715 | } |
716 | |
717 | dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n" , fifo_bytes); |
718 | |
719 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
720 | |
721 | /* Calculate how much more data can be written to the fifo */ |
722 | len = TRF7970A_FIFO_SIZE - fifo_bytes; |
723 | if (!len) { |
724 | schedule_delayed_work(dwork: &trf->timeout_work, |
725 | delay: msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); |
726 | return; |
727 | } |
728 | |
729 | len = min(skb->len, len); |
730 | |
731 | prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; |
732 | |
733 | ret = trf7970a_transmit(trf, skb, len, prefix: &prefix, prefix_len: sizeof(prefix)); |
734 | if (ret) |
735 | trf7970a_send_err_upstream(trf, errno: ret); |
736 | } |
737 | |
738 | static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) |
739 | { |
740 | struct sk_buff *skb = trf->rx_skb; |
741 | int ret; |
742 | u8 fifo_bytes; |
743 | |
744 | if (status & TRF7970A_IRQ_STATUS_ERROR) { |
745 | trf7970a_send_err_upstream(trf, errno: -EIO); |
746 | return; |
747 | } |
748 | |
749 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, val: &fifo_bytes); |
750 | if (ret) { |
751 | trf7970a_send_err_upstream(trf, errno: ret); |
752 | return; |
753 | } |
754 | |
755 | dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n" , fifo_bytes); |
756 | |
757 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
758 | |
759 | if (!fifo_bytes) |
760 | goto no_rx_data; |
761 | |
762 | if (fifo_bytes > skb_tailroom(skb)) { |
763 | skb = skb_copy_expand(skb, newheadroom: skb_headroom(skb), |
764 | max_t(int, fifo_bytes, |
765 | TRF7970A_RX_SKB_ALLOC_SIZE), |
766 | GFP_KERNEL); |
767 | if (!skb) { |
768 | trf7970a_send_err_upstream(trf, errno: -ENOMEM); |
769 | return; |
770 | } |
771 | |
772 | kfree_skb(skb: trf->rx_skb); |
773 | trf->rx_skb = skb; |
774 | } |
775 | |
776 | ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, |
777 | buf: skb_put(skb, len: fifo_bytes), len: fifo_bytes); |
778 | if (ret) { |
779 | trf7970a_send_err_upstream(trf, errno: ret); |
780 | return; |
781 | } |
782 | |
783 | /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ |
784 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && |
785 | (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { |
786 | skb->data[0] >>= 4; |
787 | status = TRF7970A_IRQ_STATUS_SRX; |
788 | } else { |
789 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; |
790 | |
791 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, val: &fifo_bytes); |
792 | if (ret) { |
793 | trf7970a_send_err_upstream(trf, errno: ret); |
794 | return; |
795 | } |
796 | |
797 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
798 | |
799 | /* If there are bytes in the FIFO, set status to '0' so |
800 | * the if stmt below doesn't fire and the driver will wait |
801 | * for the trf7970a to generate another RX interrupt. |
802 | */ |
803 | if (fifo_bytes) |
804 | status = 0; |
805 | } |
806 | |
807 | no_rx_data: |
808 | if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ |
809 | trf7970a_send_upstream(trf); |
810 | return; |
811 | } |
812 | |
813 | dev_dbg(trf->dev, "Setting timeout for %d ms\n" , |
814 | TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); |
815 | |
816 | schedule_delayed_work(dwork: &trf->timeout_work, |
817 | delay: msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); |
818 | } |
819 | |
820 | static irqreturn_t trf7970a_irq(int irq, void *dev_id) |
821 | { |
822 | struct trf7970a *trf = dev_id; |
823 | int ret; |
824 | u8 status, fifo_bytes, iso_ctrl; |
825 | |
826 | mutex_lock(&trf->lock); |
827 | |
828 | if (trf->state == TRF7970A_ST_RF_OFF) { |
829 | mutex_unlock(lock: &trf->lock); |
830 | return IRQ_NONE; |
831 | } |
832 | |
833 | ret = trf7970a_read_irqstatus(trf, status: &status); |
834 | if (ret) { |
835 | mutex_unlock(lock: &trf->lock); |
836 | return IRQ_NONE; |
837 | } |
838 | |
839 | dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n" , trf->state, |
840 | status); |
841 | |
842 | if (!status) { |
843 | mutex_unlock(lock: &trf->lock); |
844 | return IRQ_NONE; |
845 | } |
846 | |
847 | switch (trf->state) { |
848 | case TRF7970A_ST_IDLE: |
849 | case TRF7970A_ST_IDLE_RX_BLOCKED: |
850 | /* If initiator and getting interrupts caused by RF noise, |
851 | * turn off the receiver to avoid unnecessary interrupts. |
852 | * It will be turned back on in trf7970a_send_cmd() when |
853 | * the next command is issued. |
854 | */ |
855 | if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { |
856 | trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); |
857 | trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; |
858 | } |
859 | |
860 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
861 | break; |
862 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: |
863 | if (status & TRF7970A_IRQ_STATUS_TX) { |
864 | trf->ignore_timeout = |
865 | !cancel_delayed_work(dwork: &trf->timeout_work); |
866 | trf7970a_fill_fifo(trf); |
867 | } else { |
868 | trf7970a_send_err_upstream(trf, errno: -EIO); |
869 | } |
870 | break; |
871 | case TRF7970A_ST_WAIT_FOR_RX_DATA: |
872 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: |
873 | if (status & TRF7970A_IRQ_STATUS_SRX) { |
874 | trf->ignore_timeout = |
875 | !cancel_delayed_work(dwork: &trf->timeout_work); |
876 | trf7970a_drain_fifo(trf, status); |
877 | } else if (status & TRF7970A_IRQ_STATUS_FIFO) { |
878 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, |
879 | val: &fifo_bytes); |
880 | |
881 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
882 | |
883 | if (ret) |
884 | trf7970a_send_err_upstream(trf, errno: ret); |
885 | else if (!fifo_bytes) |
886 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
887 | } else if ((status == TRF7970A_IRQ_STATUS_TX) || |
888 | (!trf->is_initiator && |
889 | (status == (TRF7970A_IRQ_STATUS_TX | |
890 | TRF7970A_IRQ_STATUS_NFC_RF)))) { |
891 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
892 | |
893 | if (!trf->timeout) { |
894 | trf->ignore_timeout = |
895 | !cancel_delayed_work(dwork: &trf->timeout_work); |
896 | trf->rx_skb = ERR_PTR(error: 0); |
897 | trf7970a_send_upstream(trf); |
898 | break; |
899 | } |
900 | |
901 | if (trf->is_initiator) |
902 | break; |
903 | |
904 | iso_ctrl = trf->iso_ctrl; |
905 | |
906 | switch (trf->framing) { |
907 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: |
908 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; |
909 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
910 | trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ |
911 | break; |
912 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: |
913 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
914 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
915 | trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ |
916 | break; |
917 | case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: |
918 | ret = trf7970a_write(trf, |
919 | TRF7970A_SPECIAL_FCN_REG1, |
920 | TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); |
921 | if (ret) |
922 | goto err_unlock_exit; |
923 | |
924 | trf->special_fcn_reg1 = |
925 | TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; |
926 | break; |
927 | default: |
928 | break; |
929 | } |
930 | |
931 | if (iso_ctrl != trf->iso_ctrl) { |
932 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, |
933 | val: iso_ctrl); |
934 | if (ret) |
935 | goto err_unlock_exit; |
936 | |
937 | trf->iso_ctrl = iso_ctrl; |
938 | } |
939 | } else { |
940 | trf7970a_send_err_upstream(trf, errno: -EIO); |
941 | } |
942 | break; |
943 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
944 | if (status != TRF7970A_IRQ_STATUS_TX) |
945 | trf7970a_send_err_upstream(trf, errno: -EIO); |
946 | break; |
947 | case TRF7970A_ST_LISTENING: |
948 | if (status & TRF7970A_IRQ_STATUS_SRX) { |
949 | trf->ignore_timeout = |
950 | !cancel_delayed_work(dwork: &trf->timeout_work); |
951 | trf7970a_drain_fifo(trf, status); |
952 | } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { |
953 | trf7970a_send_err_upstream(trf, errno: -EIO); |
954 | } |
955 | break; |
956 | case TRF7970A_ST_LISTENING_MD: |
957 | if (status & TRF7970A_IRQ_STATUS_SRX) { |
958 | trf->ignore_timeout = |
959 | !cancel_delayed_work(dwork: &trf->timeout_work); |
960 | |
961 | ret = trf7970a_mode_detect(trf, rf_tech: &trf->md_rf_tech); |
962 | if (ret) { |
963 | trf7970a_send_err_upstream(trf, errno: ret); |
964 | } else { |
965 | trf->state = TRF7970A_ST_LISTENING; |
966 | trf7970a_drain_fifo(trf, status); |
967 | } |
968 | } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { |
969 | trf7970a_send_err_upstream(trf, errno: -EIO); |
970 | } |
971 | break; |
972 | default: |
973 | dev_err(trf->dev, "%s - Driver in invalid state: %d\n" , |
974 | __func__, trf->state); |
975 | } |
976 | |
977 | err_unlock_exit: |
978 | mutex_unlock(lock: &trf->lock); |
979 | return IRQ_HANDLED; |
980 | } |
981 | |
982 | static void trf7970a_issue_eof(struct trf7970a *trf) |
983 | { |
984 | int ret; |
985 | |
986 | dev_dbg(trf->dev, "Issuing EOF\n" ); |
987 | |
988 | ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
989 | if (ret) |
990 | trf7970a_send_err_upstream(trf, errno: ret); |
991 | |
992 | ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); |
993 | if (ret) |
994 | trf7970a_send_err_upstream(trf, errno: ret); |
995 | |
996 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; |
997 | |
998 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n" , |
999 | trf->timeout, trf->state); |
1000 | |
1001 | schedule_delayed_work(dwork: &trf->timeout_work, |
1002 | delay: msecs_to_jiffies(m: trf->timeout)); |
1003 | } |
1004 | |
1005 | static void trf7970a_timeout_work_handler(struct work_struct *work) |
1006 | { |
1007 | struct trf7970a *trf = container_of(work, struct trf7970a, |
1008 | timeout_work.work); |
1009 | |
1010 | dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n" , |
1011 | trf->state, trf->ignore_timeout); |
1012 | |
1013 | mutex_lock(&trf->lock); |
1014 | |
1015 | if (trf->ignore_timeout) |
1016 | trf->ignore_timeout = false; |
1017 | else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) |
1018 | trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); |
1019 | else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) |
1020 | trf7970a_issue_eof(trf); |
1021 | else |
1022 | trf7970a_send_err_upstream(trf, errno: -ETIMEDOUT); |
1023 | |
1024 | mutex_unlock(lock: &trf->lock); |
1025 | } |
1026 | |
1027 | static int trf7970a_init(struct trf7970a *trf) |
1028 | { |
1029 | int ret; |
1030 | |
1031 | dev_dbg(trf->dev, "Initializing device - state: %d\n" , trf->state); |
1032 | |
1033 | ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); |
1034 | if (ret) |
1035 | goto err_out; |
1036 | |
1037 | ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); |
1038 | if (ret) |
1039 | goto err_out; |
1040 | |
1041 | ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, |
1042 | val: trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
1043 | if (ret) |
1044 | goto err_out; |
1045 | |
1046 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, val: 0); |
1047 | if (ret) |
1048 | goto err_out; |
1049 | |
1050 | usleep_range(min: 1000, max: 2000); |
1051 | |
1052 | trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
1053 | |
1054 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
1055 | val: trf->modulator_sys_clk_ctrl); |
1056 | if (ret) |
1057 | goto err_out; |
1058 | |
1059 | ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, |
1060 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | |
1061 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); |
1062 | if (ret) |
1063 | goto err_out; |
1064 | |
1065 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, val: 0); |
1066 | if (ret) |
1067 | goto err_out; |
1068 | |
1069 | trf->special_fcn_reg1 = 0; |
1070 | |
1071 | trf->iso_ctrl = 0xff; |
1072 | return 0; |
1073 | |
1074 | err_out: |
1075 | dev_dbg(trf->dev, "Couldn't init device: %d\n" , ret); |
1076 | return ret; |
1077 | } |
1078 | |
1079 | static void trf7970a_switch_rf_off(struct trf7970a *trf) |
1080 | { |
1081 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
1082 | (trf->state == TRF7970A_ST_RF_OFF)) |
1083 | return; |
1084 | |
1085 | dev_dbg(trf->dev, "Switching rf off\n" ); |
1086 | |
1087 | trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
1088 | |
1089 | trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, val: trf->chip_status_ctrl); |
1090 | |
1091 | trf->aborting = false; |
1092 | trf->state = TRF7970A_ST_RF_OFF; |
1093 | |
1094 | pm_runtime_mark_last_busy(dev: trf->dev); |
1095 | pm_runtime_put_autosuspend(dev: trf->dev); |
1096 | } |
1097 | |
1098 | static int trf7970a_switch_rf_on(struct trf7970a *trf) |
1099 | { |
1100 | int ret; |
1101 | |
1102 | dev_dbg(trf->dev, "Switching rf on\n" ); |
1103 | |
1104 | pm_runtime_get_sync(dev: trf->dev); |
1105 | |
1106 | if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ |
1107 | dev_err(trf->dev, "%s - Incorrect state: %d\n" , __func__, |
1108 | trf->state); |
1109 | return -EINVAL; |
1110 | } |
1111 | |
1112 | ret = trf7970a_init(trf); |
1113 | if (ret) { |
1114 | dev_err(trf->dev, "%s - Can't initialize: %d\n" , __func__, ret); |
1115 | return ret; |
1116 | } |
1117 | |
1118 | trf->state = TRF7970A_ST_IDLE; |
1119 | |
1120 | return 0; |
1121 | } |
1122 | |
1123 | static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) |
1124 | { |
1125 | struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1126 | int ret = 0; |
1127 | |
1128 | dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n" , trf->state, on); |
1129 | |
1130 | mutex_lock(&trf->lock); |
1131 | |
1132 | if (on) { |
1133 | switch (trf->state) { |
1134 | case TRF7970A_ST_PWR_OFF: |
1135 | case TRF7970A_ST_RF_OFF: |
1136 | ret = trf7970a_switch_rf_on(trf); |
1137 | break; |
1138 | case TRF7970A_ST_IDLE: |
1139 | case TRF7970A_ST_IDLE_RX_BLOCKED: |
1140 | break; |
1141 | default: |
1142 | dev_err(trf->dev, "%s - Invalid request: %d %d\n" , |
1143 | __func__, trf->state, on); |
1144 | trf7970a_switch_rf_off(trf); |
1145 | ret = -EINVAL; |
1146 | } |
1147 | } else { |
1148 | switch (trf->state) { |
1149 | case TRF7970A_ST_PWR_OFF: |
1150 | case TRF7970A_ST_RF_OFF: |
1151 | break; |
1152 | default: |
1153 | dev_err(trf->dev, "%s - Invalid request: %d %d\n" , |
1154 | __func__, trf->state, on); |
1155 | ret = -EINVAL; |
1156 | fallthrough; |
1157 | case TRF7970A_ST_IDLE: |
1158 | case TRF7970A_ST_IDLE_RX_BLOCKED: |
1159 | case TRF7970A_ST_WAIT_FOR_RX_DATA: |
1160 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: |
1161 | trf7970a_switch_rf_off(trf); |
1162 | } |
1163 | } |
1164 | |
1165 | mutex_unlock(lock: &trf->lock); |
1166 | return ret; |
1167 | } |
1168 | |
1169 | static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) |
1170 | { |
1171 | int ret = 0; |
1172 | |
1173 | dev_dbg(trf->dev, "rf technology: %d\n" , tech); |
1174 | |
1175 | switch (tech) { |
1176 | case NFC_DIGITAL_RF_TECH_106A: |
1177 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; |
1178 | trf->modulator_sys_clk_ctrl = |
1179 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1180 | TRF7970A_MODULATOR_DEPTH_OOK; |
1181 | trf->guard_time = TRF7970A_GUARD_TIME_NFCA; |
1182 | break; |
1183 | case NFC_DIGITAL_RF_TECH_106B: |
1184 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; |
1185 | trf->modulator_sys_clk_ctrl = |
1186 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1187 | TRF7970A_MODULATOR_DEPTH_ASK10; |
1188 | trf->guard_time = TRF7970A_GUARD_TIME_NFCB; |
1189 | break; |
1190 | case NFC_DIGITAL_RF_TECH_212F: |
1191 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; |
1192 | trf->modulator_sys_clk_ctrl = |
1193 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1194 | 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 = |
1200 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1201 | TRF7970A_MODULATOR_DEPTH_ASK10; |
1202 | trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
1203 | break; |
1204 | case NFC_DIGITAL_RF_TECH_ISO15693: |
1205 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; |
1206 | trf->modulator_sys_clk_ctrl = |
1207 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1208 | TRF7970A_MODULATOR_DEPTH_OOK; |
1209 | trf->guard_time = TRF7970A_GUARD_TIME_15693; |
1210 | break; |
1211 | default: |
1212 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n" , tech); |
1213 | return -EINVAL; |
1214 | } |
1215 | |
1216 | trf->technology = tech; |
1217 | |
1218 | /* If in initiator mode and not changing the RF tech due to a |
1219 | * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from |
1220 | * trf7970a_init()), clear the NFC Target Detection Level register |
1221 | * due to erratum. |
1222 | */ |
1223 | if (trf->iso_ctrl == 0xff) |
1224 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, val: 0); |
1225 | |
1226 | return ret; |
1227 | } |
1228 | |
1229 | static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) |
1230 | { |
1231 | int ret; |
1232 | u8 ; |
1233 | |
1234 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
1235 | val: trf->chip_status_ctrl | |
1236 | TRF7970A_CHIP_STATUS_REC_ON); |
1237 | if (ret) |
1238 | return ret; |
1239 | |
1240 | ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); |
1241 | if (ret) |
1242 | return ret; |
1243 | |
1244 | usleep_range(min: 50, max: 60); |
1245 | |
1246 | ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, val: &rssi); |
1247 | if (ret) |
1248 | return ret; |
1249 | |
1250 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
1251 | val: trf->chip_status_ctrl); |
1252 | if (ret) |
1253 | return ret; |
1254 | |
1255 | if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) |
1256 | *is_rf_field = true; |
1257 | else |
1258 | *is_rf_field = false; |
1259 | |
1260 | return 0; |
1261 | } |
1262 | |
1263 | static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) |
1264 | { |
1265 | u8 iso_ctrl = trf->iso_ctrl_tech; |
1266 | bool is_rf_field = false; |
1267 | int ret; |
1268 | |
1269 | dev_dbg(trf->dev, "framing: %d\n" , framing); |
1270 | |
1271 | switch (framing) { |
1272 | case NFC_DIGITAL_FRAMING_NFCA_SHORT: |
1273 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: |
1274 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; |
1275 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
1276 | break; |
1277 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: |
1278 | case NFC_DIGITAL_FRAMING_NFCA_T4T: |
1279 | case NFC_DIGITAL_FRAMING_NFCB: |
1280 | case NFC_DIGITAL_FRAMING_NFCB_T4T: |
1281 | case NFC_DIGITAL_FRAMING_NFCF: |
1282 | case NFC_DIGITAL_FRAMING_NFCF_T3T: |
1283 | case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: |
1284 | case NFC_DIGITAL_FRAMING_ISO15693_T5T: |
1285 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: |
1286 | case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: |
1287 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
1288 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
1289 | break; |
1290 | case NFC_DIGITAL_FRAMING_NFCA_T2T: |
1291 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
1292 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
1293 | break; |
1294 | default: |
1295 | dev_dbg(trf->dev, "Unsupported Framing: %d\n" , framing); |
1296 | return -EINVAL; |
1297 | } |
1298 | |
1299 | trf->framing = framing; |
1300 | |
1301 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1302 | ret = trf7970a_is_rf_field(trf, is_rf_field: &is_rf_field); |
1303 | if (ret) |
1304 | return ret; |
1305 | |
1306 | if (is_rf_field) |
1307 | return -EBUSY; |
1308 | } |
1309 | |
1310 | if (iso_ctrl != trf->iso_ctrl) { |
1311 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, val: iso_ctrl); |
1312 | if (ret) |
1313 | return ret; |
1314 | |
1315 | trf->iso_ctrl = iso_ctrl; |
1316 | |
1317 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
1318 | val: trf->modulator_sys_clk_ctrl); |
1319 | if (ret) |
1320 | return ret; |
1321 | } |
1322 | |
1323 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1324 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
1325 | val: trf->chip_status_ctrl | |
1326 | TRF7970A_CHIP_STATUS_RF_ON); |
1327 | if (ret) |
1328 | return ret; |
1329 | |
1330 | trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; |
1331 | |
1332 | usleep_range(min: trf->guard_time, max: trf->guard_time + 1000); |
1333 | } |
1334 | |
1335 | return 0; |
1336 | } |
1337 | |
1338 | static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, |
1339 | int param) |
1340 | { |
1341 | struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1342 | int ret; |
1343 | |
1344 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n" , type, param); |
1345 | |
1346 | mutex_lock(&trf->lock); |
1347 | |
1348 | trf->is_initiator = true; |
1349 | |
1350 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
1351 | (trf->state == TRF7970A_ST_RF_OFF)) { |
1352 | ret = trf7970a_switch_rf_on(trf); |
1353 | if (ret) |
1354 | goto err_unlock; |
1355 | } |
1356 | |
1357 | switch (type) { |
1358 | case NFC_DIGITAL_CONFIG_RF_TECH: |
1359 | ret = trf7970a_in_config_rf_tech(trf, tech: param); |
1360 | break; |
1361 | case NFC_DIGITAL_CONFIG_FRAMING: |
1362 | ret = trf7970a_in_config_framing(trf, framing: param); |
1363 | break; |
1364 | default: |
1365 | dev_dbg(trf->dev, "Unknown type: %d\n" , type); |
1366 | ret = -EINVAL; |
1367 | } |
1368 | |
1369 | err_unlock: |
1370 | mutex_unlock(lock: &trf->lock); |
1371 | return ret; |
1372 | } |
1373 | |
1374 | static int trf7970a_is_iso15693_write_or_lock(u8 cmd) |
1375 | { |
1376 | switch (cmd) { |
1377 | case ISO15693_CMD_WRITE_SINGLE_BLOCK: |
1378 | case ISO15693_CMD_LOCK_BLOCK: |
1379 | case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: |
1380 | case ISO15693_CMD_WRITE_AFI: |
1381 | case ISO15693_CMD_LOCK_AFI: |
1382 | case ISO15693_CMD_WRITE_DSFID: |
1383 | case ISO15693_CMD_LOCK_DSFID: |
1384 | return 1; |
1385 | default: |
1386 | return 0; |
1387 | } |
1388 | } |
1389 | |
1390 | static int trf7970a_per_cmd_config(struct trf7970a *trf, |
1391 | const struct sk_buff *skb) |
1392 | { |
1393 | const u8 *req = skb->data; |
1394 | u8 special_fcn_reg1, iso_ctrl; |
1395 | int ret; |
1396 | |
1397 | trf->issue_eof = false; |
1398 | |
1399 | /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in |
1400 | * special functions register 1 is cleared; otherwise, its a write or |
1401 | * sector select command and '4_bit_RX' must be set. |
1402 | * |
1403 | * When issuing an ISO 15693 command, inspect the flags byte to see |
1404 | * what speed to use. Also, remember if the OPTION flag is set on |
1405 | * a Type 5 write or lock command so the driver will know that it |
1406 | * has to send an EOF in order to get a response. |
1407 | */ |
1408 | if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && |
1409 | (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { |
1410 | if (req[0] == NFC_T2T_CMD_READ) |
1411 | special_fcn_reg1 = 0; |
1412 | else |
1413 | special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; |
1414 | |
1415 | if (special_fcn_reg1 != trf->special_fcn_reg1) { |
1416 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, |
1417 | val: special_fcn_reg1); |
1418 | if (ret) |
1419 | return ret; |
1420 | |
1421 | trf->special_fcn_reg1 = special_fcn_reg1; |
1422 | } |
1423 | } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { |
1424 | iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; |
1425 | |
1426 | switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { |
1427 | case 0x00: |
1428 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; |
1429 | break; |
1430 | case ISO15693_REQ_FLAG_SUB_CARRIER: |
1431 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; |
1432 | break; |
1433 | case ISO15693_REQ_FLAG_DATA_RATE: |
1434 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; |
1435 | break; |
1436 | case (ISO15693_REQ_FLAG_SUB_CARRIER | |
1437 | ISO15693_REQ_FLAG_DATA_RATE): |
1438 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; |
1439 | break; |
1440 | } |
1441 | |
1442 | if (iso_ctrl != trf->iso_ctrl) { |
1443 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, val: iso_ctrl); |
1444 | if (ret) |
1445 | return ret; |
1446 | |
1447 | trf->iso_ctrl = iso_ctrl; |
1448 | } |
1449 | |
1450 | if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && |
1451 | trf7970a_is_iso15693_write_or_lock(cmd: req[1]) && |
1452 | (req[0] & ISO15693_REQ_FLAG_OPTION)) |
1453 | trf->issue_eof = true; |
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(dev: 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: &status); |
1549 | if (ret) |
1550 | goto out_err; |
1551 | |
1552 | ret = trf7970a_transmit(trf, skb, len, prefix, prefix_len: sizeof(prefix)); |
1553 | if (ret) { |
1554 | kfree_skb(skb: trf->rx_skb); |
1555 | trf->rx_skb = NULL; |
1556 | } |
1557 | |
1558 | out_err: |
1559 | mutex_unlock(lock: &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 | TRF7970A_ISO_CTRL_NFC_CE_14443A; |
1573 | trf->modulator_sys_clk_ctrl = |
1574 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1575 | TRF7970A_MODULATOR_DEPTH_OOK; |
1576 | break; |
1577 | case NFC_DIGITAL_RF_TECH_212F: |
1578 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | |
1579 | TRF7970A_ISO_CTRL_NFC_NFCF_212; |
1580 | trf->modulator_sys_clk_ctrl = |
1581 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1582 | TRF7970A_MODULATOR_DEPTH_ASK10; |
1583 | break; |
1584 | case NFC_DIGITAL_RF_TECH_424F: |
1585 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | |
1586 | TRF7970A_ISO_CTRL_NFC_NFCF_424; |
1587 | trf->modulator_sys_clk_ctrl = |
1588 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1589 | TRF7970A_MODULATOR_DEPTH_ASK10; |
1590 | break; |
1591 | default: |
1592 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n" , tech); |
1593 | return -EINVAL; |
1594 | } |
1595 | |
1596 | trf->technology = tech; |
1597 | |
1598 | /* Normally we write the ISO_CTRL register in |
1599 | * trf7970a_tg_config_framing() because the framing can change |
1600 | * the value written. However, when sending a PSL RES, |
1601 | * digital_tg_send_psl_res_complete() doesn't call |
1602 | * trf7970a_tg_config_framing() so we must write the register |
1603 | * here. |
1604 | */ |
1605 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && |
1606 | (trf->iso_ctrl_tech != trf->iso_ctrl)) { |
1607 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, |
1608 | val: trf->iso_ctrl_tech); |
1609 | |
1610 | trf->iso_ctrl = trf->iso_ctrl_tech; |
1611 | } |
1612 | |
1613 | return ret; |
1614 | } |
1615 | |
1616 | /* Since this is a target routine, several of the framing calls are |
1617 | * made between receiving the request and sending the response so they |
1618 | * should take effect until after the response is sent. This is accomplished |
1619 | * by skipping the ISO_CTRL register write here and doing it in the interrupt |
1620 | * handler. |
1621 | */ |
1622 | static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) |
1623 | { |
1624 | u8 iso_ctrl = trf->iso_ctrl_tech; |
1625 | int ret; |
1626 | |
1627 | dev_dbg(trf->dev, "framing: %d\n" , framing); |
1628 | |
1629 | switch (framing) { |
1630 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: |
1631 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; |
1632 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
1633 | break; |
1634 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: |
1635 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: |
1636 | case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: |
1637 | /* These ones are applied in the interrupt handler */ |
1638 | iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ |
1639 | break; |
1640 | case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: |
1641 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
1642 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
1643 | break; |
1644 | case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: |
1645 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
1646 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
1647 | break; |
1648 | default: |
1649 | dev_dbg(trf->dev, "Unsupported Framing: %d\n" , framing); |
1650 | return -EINVAL; |
1651 | } |
1652 | |
1653 | trf->framing = framing; |
1654 | |
1655 | if (iso_ctrl != trf->iso_ctrl) { |
1656 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, val: iso_ctrl); |
1657 | if (ret) |
1658 | return ret; |
1659 | |
1660 | trf->iso_ctrl = iso_ctrl; |
1661 | |
1662 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
1663 | val: trf->modulator_sys_clk_ctrl); |
1664 | if (ret) |
1665 | return ret; |
1666 | } |
1667 | |
1668 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1669 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, |
1670 | val: trf->chip_status_ctrl | |
1671 | TRF7970A_CHIP_STATUS_RF_ON); |
1672 | if (ret) |
1673 | return ret; |
1674 | |
1675 | trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; |
1676 | } |
1677 | |
1678 | return 0; |
1679 | } |
1680 | |
1681 | static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, |
1682 | int param) |
1683 | { |
1684 | struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1685 | int ret; |
1686 | |
1687 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n" , type, param); |
1688 | |
1689 | mutex_lock(&trf->lock); |
1690 | |
1691 | trf->is_initiator = false; |
1692 | |
1693 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
1694 | (trf->state == TRF7970A_ST_RF_OFF)) { |
1695 | ret = trf7970a_switch_rf_on(trf); |
1696 | if (ret) |
1697 | goto err_unlock; |
1698 | } |
1699 | |
1700 | switch (type) { |
1701 | case NFC_DIGITAL_CONFIG_RF_TECH: |
1702 | ret = trf7970a_tg_config_rf_tech(trf, tech: param); |
1703 | break; |
1704 | case NFC_DIGITAL_CONFIG_FRAMING: |
1705 | ret = trf7970a_tg_config_framing(trf, framing: param); |
1706 | break; |
1707 | default: |
1708 | dev_dbg(trf->dev, "Unknown type: %d\n" , type); |
1709 | ret = -EINVAL; |
1710 | } |
1711 | |
1712 | err_unlock: |
1713 | mutex_unlock(lock: &trf->lock); |
1714 | return ret; |
1715 | } |
1716 | |
1717 | static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
1718 | nfc_digital_cmd_complete_t cb, void *arg, |
1719 | bool mode_detect) |
1720 | { |
1721 | struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1722 | int ret; |
1723 | |
1724 | mutex_lock(&trf->lock); |
1725 | |
1726 | if ((trf->state != TRF7970A_ST_IDLE) && |
1727 | (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { |
1728 | dev_err(trf->dev, "%s - Bogus state: %d\n" , __func__, |
1729 | trf->state); |
1730 | ret = -EIO; |
1731 | goto out_err; |
1732 | } |
1733 | |
1734 | if (trf->aborting) { |
1735 | dev_dbg(trf->dev, "Abort process complete\n" ); |
1736 | trf->aborting = false; |
1737 | ret = -ECANCELED; |
1738 | goto out_err; |
1739 | } |
1740 | |
1741 | trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, |
1742 | GFP_KERNEL); |
1743 | if (!trf->rx_skb) { |
1744 | dev_dbg(trf->dev, "Can't alloc rx_skb\n" ); |
1745 | ret = -ENOMEM; |
1746 | goto out_err; |
1747 | } |
1748 | |
1749 | ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, |
1750 | TRF7970A_RX_SPECIAL_SETTINGS_HBT | |
1751 | TRF7970A_RX_SPECIAL_SETTINGS_M848 | |
1752 | TRF7970A_RX_SPECIAL_SETTINGS_C424 | |
1753 | TRF7970A_RX_SPECIAL_SETTINGS_C212); |
1754 | if (ret) |
1755 | goto out_err; |
1756 | |
1757 | ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, |
1758 | val: trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
1759 | if (ret) |
1760 | goto out_err; |
1761 | |
1762 | ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, |
1763 | TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); |
1764 | if (ret) |
1765 | goto out_err; |
1766 | |
1767 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, |
1768 | TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); |
1769 | if (ret) |
1770 | goto out_err; |
1771 | |
1772 | trf->ddev = ddev; |
1773 | trf->cb = cb; |
1774 | trf->cb_arg = arg; |
1775 | trf->timeout = timeout; |
1776 | trf->ignore_timeout = false; |
1777 | |
1778 | ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); |
1779 | if (ret) |
1780 | goto out_err; |
1781 | |
1782 | trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : |
1783 | TRF7970A_ST_LISTENING; |
1784 | |
1785 | schedule_delayed_work(dwork: &trf->timeout_work, delay: msecs_to_jiffies(m: timeout)); |
1786 | |
1787 | out_err: |
1788 | mutex_unlock(lock: &trf->lock); |
1789 | return ret; |
1790 | } |
1791 | |
1792 | static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
1793 | nfc_digital_cmd_complete_t cb, void *arg) |
1794 | { |
1795 | const struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1796 | |
1797 | dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n" , |
1798 | trf->state, timeout); |
1799 | |
1800 | return _trf7970a_tg_listen(ddev, timeout, cb, arg, mode_detect: false); |
1801 | } |
1802 | |
1803 | static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, |
1804 | u16 timeout, nfc_digital_cmd_complete_t cb, |
1805 | void *arg) |
1806 | { |
1807 | const struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1808 | int ret; |
1809 | |
1810 | dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n" , |
1811 | trf->state, timeout); |
1812 | |
1813 | ret = trf7970a_tg_configure_hw(ddev, type: NFC_DIGITAL_CONFIG_RF_TECH, |
1814 | param: NFC_DIGITAL_RF_TECH_106A); |
1815 | if (ret) |
1816 | return ret; |
1817 | |
1818 | ret = trf7970a_tg_configure_hw(ddev, type: NFC_DIGITAL_CONFIG_FRAMING, |
1819 | param: NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); |
1820 | if (ret) |
1821 | return ret; |
1822 | |
1823 | return _trf7970a_tg_listen(ddev, timeout, cb, arg, mode_detect: true); |
1824 | } |
1825 | |
1826 | static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) |
1827 | { |
1828 | const struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1829 | |
1830 | dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n" , |
1831 | trf->state, trf->md_rf_tech); |
1832 | |
1833 | *rf_tech = trf->md_rf_tech; |
1834 | |
1835 | return 0; |
1836 | } |
1837 | |
1838 | static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) |
1839 | { |
1840 | struct trf7970a *trf = nfc_digital_get_drvdata(dev: ddev); |
1841 | |
1842 | dev_dbg(trf->dev, "Abort process initiated\n" ); |
1843 | |
1844 | mutex_lock(&trf->lock); |
1845 | |
1846 | switch (trf->state) { |
1847 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: |
1848 | case TRF7970A_ST_WAIT_FOR_RX_DATA: |
1849 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: |
1850 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
1851 | trf->aborting = true; |
1852 | break; |
1853 | case TRF7970A_ST_LISTENING: |
1854 | trf->ignore_timeout = !cancel_delayed_work(dwork: &trf->timeout_work); |
1855 | trf7970a_send_err_upstream(trf, errno: -ECANCELED); |
1856 | dev_dbg(trf->dev, "Abort process complete\n" ); |
1857 | break; |
1858 | default: |
1859 | break; |
1860 | } |
1861 | |
1862 | mutex_unlock(lock: &trf->lock); |
1863 | } |
1864 | |
1865 | static const struct nfc_digital_ops trf7970a_nfc_ops = { |
1866 | .in_configure_hw = trf7970a_in_configure_hw, |
1867 | .in_send_cmd = trf7970a_send_cmd, |
1868 | .tg_configure_hw = trf7970a_tg_configure_hw, |
1869 | .tg_send_cmd = trf7970a_send_cmd, |
1870 | .tg_listen = trf7970a_tg_listen, |
1871 | .tg_listen_md = trf7970a_tg_listen_md, |
1872 | .tg_get_rf_tech = trf7970a_tg_get_rf_tech, |
1873 | .switch_rf = trf7970a_switch_rf, |
1874 | .abort_cmd = trf7970a_abort_cmd, |
1875 | }; |
1876 | |
1877 | static int trf7970a_power_up(struct trf7970a *trf) |
1878 | { |
1879 | int ret; |
1880 | |
1881 | dev_dbg(trf->dev, "Powering up - state: %d\n" , trf->state); |
1882 | |
1883 | if (trf->state != TRF7970A_ST_PWR_OFF) |
1884 | return 0; |
1885 | |
1886 | ret = regulator_enable(regulator: trf->regulator); |
1887 | if (ret) { |
1888 | dev_err(trf->dev, "%s - Can't enable VIN: %d\n" , __func__, ret); |
1889 | return ret; |
1890 | } |
1891 | |
1892 | usleep_range(min: 5000, max: 6000); |
1893 | |
1894 | if (trf->en2_gpiod && |
1895 | !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { |
1896 | gpiod_set_value_cansleep(desc: trf->en2_gpiod, value: 1); |
1897 | usleep_range(min: 1000, max: 2000); |
1898 | } |
1899 | |
1900 | gpiod_set_value_cansleep(desc: trf->en_gpiod, value: 1); |
1901 | |
1902 | usleep_range(min: 20000, max: 21000); |
1903 | |
1904 | trf->state = TRF7970A_ST_RF_OFF; |
1905 | |
1906 | return 0; |
1907 | } |
1908 | |
1909 | static int trf7970a_power_down(struct trf7970a *trf) |
1910 | { |
1911 | int ret; |
1912 | |
1913 | dev_dbg(trf->dev, "Powering down - state: %d\n" , trf->state); |
1914 | |
1915 | if (trf->state == TRF7970A_ST_PWR_OFF) |
1916 | return 0; |
1917 | |
1918 | if (trf->state != TRF7970A_ST_RF_OFF) { |
1919 | dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n" , |
1920 | trf->state); |
1921 | return -EBUSY; |
1922 | } |
1923 | |
1924 | gpiod_set_value_cansleep(desc: trf->en_gpiod, value: 0); |
1925 | |
1926 | if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) |
1927 | gpiod_set_value_cansleep(desc: trf->en2_gpiod, value: 0); |
1928 | |
1929 | ret = regulator_disable(regulator: trf->regulator); |
1930 | if (ret) |
1931 | dev_err(trf->dev, "%s - Can't disable VIN: %d\n" , __func__, |
1932 | ret); |
1933 | |
1934 | trf->state = TRF7970A_ST_PWR_OFF; |
1935 | |
1936 | return ret; |
1937 | } |
1938 | |
1939 | static int trf7970a_startup(struct trf7970a *trf) |
1940 | { |
1941 | int ret; |
1942 | |
1943 | ret = trf7970a_power_up(trf); |
1944 | if (ret) |
1945 | return ret; |
1946 | |
1947 | pm_runtime_set_active(dev: trf->dev); |
1948 | pm_runtime_enable(dev: trf->dev); |
1949 | pm_runtime_mark_last_busy(dev: trf->dev); |
1950 | |
1951 | return 0; |
1952 | } |
1953 | |
1954 | static void trf7970a_shutdown(struct trf7970a *trf) |
1955 | { |
1956 | switch (trf->state) { |
1957 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: |
1958 | case TRF7970A_ST_WAIT_FOR_RX_DATA: |
1959 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: |
1960 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
1961 | case TRF7970A_ST_LISTENING: |
1962 | trf7970a_send_err_upstream(trf, errno: -ECANCELED); |
1963 | fallthrough; |
1964 | case TRF7970A_ST_IDLE: |
1965 | case TRF7970A_ST_IDLE_RX_BLOCKED: |
1966 | trf7970a_switch_rf_off(trf); |
1967 | break; |
1968 | default: |
1969 | break; |
1970 | } |
1971 | |
1972 | pm_runtime_disable(dev: trf->dev); |
1973 | pm_runtime_set_suspended(dev: trf->dev); |
1974 | |
1975 | trf7970a_power_down(trf); |
1976 | } |
1977 | |
1978 | static int trf7970a_get_autosuspend_delay(const struct device_node *np) |
1979 | { |
1980 | int autosuspend_delay, ret; |
1981 | |
1982 | ret = of_property_read_u32(np, propname: "autosuspend-delay" , out_value: &autosuspend_delay); |
1983 | if (ret) |
1984 | autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; |
1985 | |
1986 | return autosuspend_delay; |
1987 | } |
1988 | |
1989 | static int trf7970a_probe(struct spi_device *spi) |
1990 | { |
1991 | const struct device_node *np = spi->dev.of_node; |
1992 | struct trf7970a *trf; |
1993 | int uvolts, autosuspend_delay, ret; |
1994 | u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; |
1995 | |
1996 | if (!np) { |
1997 | dev_err(&spi->dev, "No Device Tree entry\n" ); |
1998 | return -EINVAL; |
1999 | } |
2000 | |
2001 | trf = devm_kzalloc(dev: &spi->dev, size: sizeof(*trf), GFP_KERNEL); |
2002 | if (!trf) |
2003 | return -ENOMEM; |
2004 | |
2005 | trf->state = TRF7970A_ST_PWR_OFF; |
2006 | trf->dev = &spi->dev; |
2007 | trf->spi = spi; |
2008 | |
2009 | spi->mode = SPI_MODE_1; |
2010 | spi->bits_per_word = 8; |
2011 | |
2012 | ret = spi_setup(spi); |
2013 | if (ret < 0) { |
2014 | dev_err(trf->dev, "Can't set up SPI Communication\n" ); |
2015 | return ret; |
2016 | } |
2017 | |
2018 | if (of_property_read_bool(np, propname: "irq-status-read-quirk" )) |
2019 | trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; |
2020 | |
2021 | /* There are two enable pins - only EN must be present in the DT */ |
2022 | trf->en_gpiod = devm_gpiod_get_index(dev: trf->dev, con_id: "ti,enable" , idx: 0, |
2023 | flags: GPIOD_OUT_LOW); |
2024 | if (IS_ERR(ptr: trf->en_gpiod)) { |
2025 | dev_err(trf->dev, "No EN GPIO property\n" ); |
2026 | return PTR_ERR(ptr: trf->en_gpiod); |
2027 | } |
2028 | |
2029 | trf->en2_gpiod = devm_gpiod_get_index_optional(dev: trf->dev, con_id: "ti,enable" , index: 1, |
2030 | flags: GPIOD_OUT_LOW); |
2031 | if (!trf->en2_gpiod) { |
2032 | dev_info(trf->dev, "No EN2 GPIO property\n" ); |
2033 | } else if (IS_ERR(ptr: trf->en2_gpiod)) { |
2034 | dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n" , |
2035 | PTR_ERR(trf->en2_gpiod)); |
2036 | return PTR_ERR(ptr: trf->en2_gpiod); |
2037 | } else if (of_property_read_bool(np, propname: "en2-rf-quirk" )) { |
2038 | trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; |
2039 | } |
2040 | |
2041 | of_property_read_u32(np, propname: "clock-frequency" , out_value: &clk_freq); |
2042 | if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && |
2043 | (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { |
2044 | dev_err(trf->dev, |
2045 | "clock-frequency (%u Hz) unsupported\n" , clk_freq); |
2046 | return -EINVAL; |
2047 | } |
2048 | |
2049 | if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) { |
2050 | trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ; |
2051 | dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n" ); |
2052 | } else { |
2053 | trf->modulator_sys_clk_ctrl = 0; |
2054 | } |
2055 | |
2056 | ret = devm_request_threaded_irq(dev: trf->dev, irq: spi->irq, NULL, |
2057 | thread_fn: trf7970a_irq, |
2058 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
2059 | devname: "trf7970a" , dev_id: trf); |
2060 | if (ret) { |
2061 | dev_err(trf->dev, "Can't request IRQ#%d: %d\n" , spi->irq, ret); |
2062 | return ret; |
2063 | } |
2064 | |
2065 | mutex_init(&trf->lock); |
2066 | INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); |
2067 | |
2068 | trf->regulator = devm_regulator_get(dev: &spi->dev, id: "vin" ); |
2069 | if (IS_ERR(ptr: trf->regulator)) { |
2070 | ret = PTR_ERR(ptr: trf->regulator); |
2071 | dev_err(trf->dev, "Can't get VIN regulator: %d\n" , ret); |
2072 | goto err_destroy_lock; |
2073 | } |
2074 | |
2075 | ret = regulator_enable(regulator: trf->regulator); |
2076 | if (ret) { |
2077 | dev_err(trf->dev, "Can't enable VIN: %d\n" , ret); |
2078 | goto err_destroy_lock; |
2079 | } |
2080 | |
2081 | uvolts = regulator_get_voltage(regulator: trf->regulator); |
2082 | if (uvolts > 4000000) |
2083 | trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; |
2084 | |
2085 | trf->regulator = devm_regulator_get(dev: &spi->dev, id: "vdd-io" ); |
2086 | if (IS_ERR(ptr: trf->regulator)) { |
2087 | ret = PTR_ERR(ptr: trf->regulator); |
2088 | dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n" , ret); |
2089 | goto err_destroy_lock; |
2090 | } |
2091 | |
2092 | ret = regulator_enable(regulator: trf->regulator); |
2093 | if (ret) { |
2094 | dev_err(trf->dev, "Can't enable VDD_IO: %d\n" , ret); |
2095 | goto err_destroy_lock; |
2096 | } |
2097 | |
2098 | if (regulator_get_voltage(regulator: trf->regulator) == 1800000) { |
2099 | trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; |
2100 | dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n" ); |
2101 | } |
2102 | |
2103 | trf->ddev = nfc_digital_allocate_device(ops: &trf7970a_nfc_ops, |
2104 | TRF7970A_SUPPORTED_PROTOCOLS, |
2105 | NFC_DIGITAL_DRV_CAPS_IN_CRC | |
2106 | NFC_DIGITAL_DRV_CAPS_TG_CRC, tx_headroom: 0, |
2107 | tx_tailroom: 0); |
2108 | if (!trf->ddev) { |
2109 | dev_err(trf->dev, "Can't allocate NFC digital device\n" ); |
2110 | ret = -ENOMEM; |
2111 | goto err_disable_regulator; |
2112 | } |
2113 | |
2114 | nfc_digital_set_parent_dev(ndev: trf->ddev, dev: trf->dev); |
2115 | nfc_digital_set_drvdata(dev: trf->ddev, data: trf); |
2116 | spi_set_drvdata(spi, data: trf); |
2117 | |
2118 | autosuspend_delay = trf7970a_get_autosuspend_delay(np); |
2119 | |
2120 | pm_runtime_set_autosuspend_delay(dev: trf->dev, delay: autosuspend_delay); |
2121 | pm_runtime_use_autosuspend(dev: trf->dev); |
2122 | |
2123 | ret = trf7970a_startup(trf); |
2124 | if (ret) |
2125 | goto err_free_ddev; |
2126 | |
2127 | ret = nfc_digital_register_device(ndev: trf->ddev); |
2128 | if (ret) { |
2129 | dev_err(trf->dev, "Can't register NFC digital device: %d\n" , |
2130 | ret); |
2131 | goto err_shutdown; |
2132 | } |
2133 | |
2134 | return 0; |
2135 | |
2136 | err_shutdown: |
2137 | trf7970a_shutdown(trf); |
2138 | err_free_ddev: |
2139 | nfc_digital_free_device(ndev: trf->ddev); |
2140 | err_disable_regulator: |
2141 | regulator_disable(regulator: trf->regulator); |
2142 | err_destroy_lock: |
2143 | mutex_destroy(lock: &trf->lock); |
2144 | return ret; |
2145 | } |
2146 | |
2147 | static void trf7970a_remove(struct spi_device *spi) |
2148 | { |
2149 | struct trf7970a *trf = spi_get_drvdata(spi); |
2150 | |
2151 | mutex_lock(&trf->lock); |
2152 | |
2153 | trf7970a_shutdown(trf); |
2154 | |
2155 | mutex_unlock(lock: &trf->lock); |
2156 | |
2157 | nfc_digital_unregister_device(ndev: trf->ddev); |
2158 | nfc_digital_free_device(ndev: trf->ddev); |
2159 | |
2160 | regulator_disable(regulator: trf->regulator); |
2161 | |
2162 | mutex_destroy(lock: &trf->lock); |
2163 | } |
2164 | |
2165 | #ifdef CONFIG_PM_SLEEP |
2166 | static int trf7970a_suspend(struct device *dev) |
2167 | { |
2168 | struct spi_device *spi = to_spi_device(dev); |
2169 | struct trf7970a *trf = spi_get_drvdata(spi); |
2170 | |
2171 | mutex_lock(&trf->lock); |
2172 | |
2173 | trf7970a_shutdown(trf); |
2174 | |
2175 | mutex_unlock(lock: &trf->lock); |
2176 | |
2177 | return 0; |
2178 | } |
2179 | |
2180 | static int trf7970a_resume(struct device *dev) |
2181 | { |
2182 | struct spi_device *spi = to_spi_device(dev); |
2183 | struct trf7970a *trf = spi_get_drvdata(spi); |
2184 | int ret; |
2185 | |
2186 | mutex_lock(&trf->lock); |
2187 | |
2188 | ret = trf7970a_startup(trf); |
2189 | |
2190 | mutex_unlock(lock: &trf->lock); |
2191 | |
2192 | return ret; |
2193 | } |
2194 | #endif |
2195 | |
2196 | #ifdef CONFIG_PM |
2197 | static int trf7970a_pm_runtime_suspend(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 | mutex_lock(&trf->lock); |
2204 | |
2205 | ret = trf7970a_power_down(trf); |
2206 | |
2207 | mutex_unlock(lock: &trf->lock); |
2208 | |
2209 | return ret; |
2210 | } |
2211 | |
2212 | static int trf7970a_pm_runtime_resume(struct device *dev) |
2213 | { |
2214 | struct spi_device *spi = to_spi_device(dev); |
2215 | struct trf7970a *trf = spi_get_drvdata(spi); |
2216 | int ret; |
2217 | |
2218 | ret = trf7970a_power_up(trf); |
2219 | if (!ret) |
2220 | pm_runtime_mark_last_busy(dev); |
2221 | |
2222 | return ret; |
2223 | } |
2224 | #endif |
2225 | |
2226 | static const struct dev_pm_ops trf7970a_pm_ops = { |
2227 | SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) |
2228 | SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, |
2229 | trf7970a_pm_runtime_resume, NULL) |
2230 | }; |
2231 | |
2232 | static const struct of_device_id trf7970a_of_match[] __maybe_unused = { |
2233 | {.compatible = "ti,trf7970a" ,}, |
2234 | {}, |
2235 | }; |
2236 | |
2237 | MODULE_DEVICE_TABLE(of, trf7970a_of_match); |
2238 | |
2239 | static const struct spi_device_id trf7970a_id_table[] = { |
2240 | {"trf7970a" , 0}, |
2241 | {} |
2242 | }; |
2243 | |
2244 | MODULE_DEVICE_TABLE(spi, trf7970a_id_table); |
2245 | |
2246 | static struct spi_driver trf7970a_spi_driver = { |
2247 | .probe = trf7970a_probe, |
2248 | .remove = trf7970a_remove, |
2249 | .id_table = trf7970a_id_table, |
2250 | .driver = { |
2251 | .name = "trf7970a" , |
2252 | .of_match_table = of_match_ptr(trf7970a_of_match), |
2253 | .pm = &trf7970a_pm_ops, |
2254 | }, |
2255 | }; |
2256 | |
2257 | module_spi_driver(trf7970a_spi_driver); |
2258 | |
2259 | MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>" ); |
2260 | MODULE_LICENSE("GPL v2" ); |
2261 | MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver" ); |
2262 | |