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