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165063f1 MG |
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/nfc.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/of_gpio.h> | |
25 | #include <linux/spi/spi.h> | |
26 | #include <linux/regulator/consumer.h> | |
27 | ||
28 | #include <net/nfc/nfc.h> | |
29 | #include <net/nfc/digital.h> | |
30 | ||
31 | /* There are 3 ways the host can communicate with the trf7970a: | |
32 | * parallel mode, SPI with Slave Select (SS) mode, and SPI without | |
33 | * SS mode. The driver only supports the two SPI modes. | |
34 | * | |
35 | * The trf7970a is very timing sensitive and the VIN, EN2, and EN | |
36 | * pins must asserted in that order and with specific delays in between. | |
37 | * The delays used in the driver were provided by TI and have been | |
38 | * confirmed to work with this driver. | |
39 | * | |
40 | * Timeouts are implemented using the delayed workqueue kernel facility. | |
41 | * Timeouts are required so things don't hang when there is no response | |
42 | * from the trf7970a (or tag). Using this mechanism creates a race with | |
43 | * interrupts, however. That is, an interrupt and a timeout could occur | |
44 | * closely enough together that one is blocked by the mutex while the other | |
45 | * executes. When the timeout handler executes first and blocks the | |
46 | * interrupt handler, it will eventually set the state to IDLE so the | |
47 | * interrupt handler will check the state and exit with no harm done. | |
48 | * When the interrupt handler executes first and blocks the timeout handler, | |
49 | * the cancel_delayed_work() call will know that it didn't cancel the | |
50 | * work item (i.e., timeout) and will return zero. That return code is | |
51 | * used by the timer handler to indicate that it should ignore the timeout | |
52 | * once its unblocked. | |
53 | * | |
54 | * Aborting an active command isn't as simple as it seems because the only | |
55 | * way to abort a command that's already been sent to the tag is so turn | |
56 | * off power to the tag. If we do that, though, we'd have to go through | |
57 | * the entire anticollision procedure again but the digital layer doesn't | |
58 | * support that. So, if an abort is received before trf7970a_in_send_cmd() | |
59 | * has sent the command to the tag, it simply returns -ECANCELED. If the | |
60 | * command has already been sent to the tag, then the driver continues | |
61 | * normally and recieves the response data (or error) but just before | |
62 | * sending the data upstream, it frees the rx_skb and sends -ECANCELED | |
63 | * upstream instead. If the command failed, that error will be sent | |
64 | * upstream. | |
65 | * | |
66 | * When recieving data from a tag and the interrupt status register has | |
67 | * only the SRX bit set, it means that all of the data has been received | |
68 | * (once what's in the fifo has been read). However, depending on timing | |
69 | * an interrupt status with only the SRX bit set may not be recived. In | |
5fa3af35 MG |
70 | * those cases, the timeout mechanism is used to wait 20 ms in case more |
71 | * data arrives. After 20 ms, it is assumed that all of the data has been | |
165063f1 MG |
72 | * received and the accumulated rx data is sent upstream. The |
73 | * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose | |
74 | * (i.e., it indicates that some data has been received but we're not sure | |
75 | * if there is more coming so a timeout in this state means all data has | |
5fa3af35 MG |
76 | * been received and there isn't an error). The delay is 20 ms since delays |
77 | * of ~16 ms have been observed during testing. | |
165063f1 MG |
78 | * |
79 | * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. | |
80 | * Having only 4 bits in the FIFO won't normally generate an interrupt so | |
81 | * driver enables the '4_bit_RX' bit of the Special Functions register 1 | |
82 | * to cause an interrupt in that case. Leaving that bit for a read command | |
83 | * messes up the data returned so it is only enabled when the framing is | |
84 | * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. | |
85 | * Unfortunately, that means that the driver has to peek into tx frames | |
86 | * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by | |
87 | * the trf7970a_per_cmd_config() routine. | |
9d9304b3 MG |
88 | * |
89 | * ISO/IEC 15693 frames specify whether to use single or double sub-carrier | |
90 | * frequencies and whether to use low or high data rates in the flags byte | |
91 | * of the frame. This means that the driver has to peek at all 15693 frames | |
92 | * to determine what speed to set the communication to. In addition, write | |
93 | * and lock commands use the OPTION flag to indicate that an EOF must be | |
94 | * sent to the tag before it will send its response. So the driver has to | |
95 | * examine all frames for that reason too. | |
96 | * | |
97 | * It is unclear how long to wait before sending the EOF. According to the | |
98 | * Note under Table 1-1 in section 1.6 of | |
99 | * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least | |
100 | * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long | |
101 | * enough. For this reason, the driver waits 20 ms which seems to work | |
102 | * reliably. | |
165063f1 MG |
103 | */ |
104 | ||
80062891 | 105 | #define TRF7970A_SUPPORTED_PROTOCOLS \ |
9d9304b3 MG |
106 | (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ |
107 | NFC_PROTO_ISO15693_MASK) | |
165063f1 MG |
108 | |
109 | /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends | |
110 | * on what the current framing is, the address of the TX length byte 1 | |
111 | * register (0x1d), and the 2 byte length of the data to be transmitted. | |
112 | * That totals 5 bytes. | |
113 | */ | |
114 | #define TRF7970A_TX_SKB_HEADROOM 5 | |
115 | ||
116 | #define TRF7970A_RX_SKB_ALLOC_SIZE 256 | |
117 | ||
118 | #define TRF7970A_FIFO_SIZE 128 | |
119 | ||
120 | /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ | |
121 | #define TRF7970A_TX_MAX (4096 - 1) | |
122 | ||
5fa3af35 | 123 | #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 |
165063f1 | 124 | #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 3 |
9d9304b3 | 125 | #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 20 |
165063f1 MG |
126 | |
127 | /* Quirks */ | |
128 | /* Erratum: When reading IRQ Status register on trf7970a, we must issue a | |
129 | * read continuous command for IRQ Status and Collision Position registers. | |
130 | */ | |
131 | #define TRF7970A_QUIRK_IRQ_STATUS_READ_ERRATA BIT(0) | |
132 | ||
133 | /* Direct commands */ | |
134 | #define TRF7970A_CMD_IDLE 0x00 | |
135 | #define TRF7970A_CMD_SOFT_INIT 0x03 | |
136 | #define TRF7970A_CMD_RF_COLLISION 0x04 | |
137 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 | |
138 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 | |
139 | #define TRF7970A_CMD_FIFO_RESET 0x0f | |
140 | #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 | |
141 | #define TRF7970A_CMD_TRANSMIT 0x11 | |
142 | #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 | |
143 | #define TRF7970A_CMD_DELAY_TRANSMIT 0x13 | |
144 | #define TRF7970A_CMD_EOF 0x14 | |
145 | #define TRF7970A_CMD_CLOSE_SLOT 0x15 | |
146 | #define TRF7970A_CMD_BLOCK_RX 0x16 | |
147 | #define TRF7970A_CMD_ENABLE_RX 0x17 | |
148 | #define TRF7970A_CMD_TEST_EXT_RF 0x18 | |
149 | #define TRF7970A_CMD_TEST_INT_RF 0x19 | |
150 | #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a | |
151 | ||
152 | /* Bits determining whether its a direct command or register R/W, | |
153 | * whether to use a continuous SPI transaction or not, and the actual | |
154 | * direct cmd opcode or regster address. | |
155 | */ | |
156 | #define TRF7970A_CMD_BIT_CTRL BIT(7) | |
157 | #define TRF7970A_CMD_BIT_RW BIT(6) | |
158 | #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) | |
159 | #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) | |
160 | ||
161 | /* Registers addresses */ | |
162 | #define TRF7970A_CHIP_STATUS_CTRL 0x00 | |
163 | #define TRF7970A_ISO_CTRL 0x01 | |
164 | #define TRF7970A_ISO14443B_TX_OPTIONS 0x02 | |
165 | #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 | |
166 | #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 | |
167 | #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 | |
168 | #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 | |
169 | #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 | |
170 | #define TRF7970A_RX_WAIT_TIME 0x08 | |
171 | #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 | |
172 | #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a | |
173 | #define TRF7970A_REG_IO_CTRL 0x0b | |
174 | #define TRF7970A_IRQ_STATUS 0x0c | |
175 | #define TRF7970A_COLLISION_IRQ_MASK 0x0d | |
176 | #define TRF7970A_COLLISION_POSITION 0x0e | |
177 | #define TRF7970A_RSSI_OSC_STATUS 0x0f | |
178 | #define TRF7970A_SPECIAL_FCN_REG1 0x10 | |
179 | #define TRF7970A_SPECIAL_FCN_REG2 0x11 | |
180 | #define TRF7970A_RAM1 0x12 | |
181 | #define TRF7970A_RAM2 0x13 | |
182 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 | |
183 | #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 | |
184 | #define TRF7970A_NFCID1 0x17 | |
185 | #define TRF7970A_NFC_TARGET_LEVEL 0x18 | |
186 | #define TRF79070A_NFC_TARGET_PROTOCOL 0x19 | |
187 | #define TRF7970A_TEST_REGISTER1 0x1a | |
188 | #define TRF7970A_TEST_REGISTER2 0x1b | |
189 | #define TRF7970A_FIFO_STATUS 0x1c | |
190 | #define TRF7970A_TX_LENGTH_BYTE1 0x1d | |
191 | #define TRF7970A_TX_LENGTH_BYTE2 0x1e | |
192 | #define TRF7970A_FIFO_IO_REGISTER 0x1f | |
193 | ||
194 | /* Chip Status Control Register Bits */ | |
195 | #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) | |
196 | #define TRF7970A_CHIP_STATUS_REC_ON BIT(1) | |
197 | #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) | |
198 | #define TRF7970A_CHIP_STATUS_PM_ON BIT(3) | |
199 | #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) | |
200 | #define TRF7970A_CHIP_STATUS_RF_ON BIT(5) | |
201 | #define TRF7970A_CHIP_STATUS_DIRECT BIT(6) | |
202 | #define TRF7970A_CHIP_STATUS_STBY BIT(7) | |
203 | ||
204 | /* ISO Control Register Bits */ | |
205 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 | |
206 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 | |
207 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 | |
208 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 | |
209 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 | |
210 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 | |
211 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 | |
212 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 | |
213 | #define TRF7970A_ISO_CTRL_14443A_106 0x08 | |
214 | #define TRF7970A_ISO_CTRL_14443A_212 0x09 | |
215 | #define TRF7970A_ISO_CTRL_14443A_424 0x0a | |
216 | #define TRF7970A_ISO_CTRL_14443A_848 0x0b | |
217 | #define TRF7970A_ISO_CTRL_14443B_106 0x0c | |
218 | #define TRF7970A_ISO_CTRL_14443B_212 0x0d | |
219 | #define TRF7970A_ISO_CTRL_14443B_424 0x0e | |
220 | #define TRF7970A_ISO_CTRL_14443B_848 0x0f | |
221 | #define TRF7970A_ISO_CTRL_FELICA_212 0x1a | |
222 | #define TRF7970A_ISO_CTRL_FELICA_424 0x1b | |
223 | #define TRF7970A_ISO_CTRL_RFID BIT(5) | |
224 | #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) | |
225 | #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ | |
226 | ||
227 | #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f | |
228 | ||
229 | /* Modulator and SYS_CLK Control Register Bits */ | |
230 | #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) | |
231 | #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) | |
232 | #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) | |
233 | #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) | |
234 | #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) | |
235 | #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) | |
236 | #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) | |
237 | #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) | |
238 | #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) | |
239 | #define TRF7970A_MODULATOR_EN_ANA BIT(3) | |
240 | #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) | |
241 | #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) | |
242 | #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) | |
243 | #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) | |
244 | #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) | |
245 | #define TRF7970A_MODULATOR_EN_OOK BIT(6) | |
246 | #define TRF7970A_MODULATOR_27MHZ BIT(7) | |
247 | ||
248 | /* IRQ Status Register Bits */ | |
249 | #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ | |
250 | #define TRF7970A_IRQ_STATUS_COL BIT(1) | |
251 | #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) | |
252 | #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) | |
253 | #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) | |
254 | #define TRF7970A_IRQ_STATUS_FIFO BIT(5) | |
255 | #define TRF7970A_IRQ_STATUS_SRX BIT(6) | |
256 | #define TRF7970A_IRQ_STATUS_TX BIT(7) | |
257 | ||
258 | #define TRF7970A_IRQ_STATUS_ERROR \ | |
259 | (TRF7970A_IRQ_STATUS_COL | \ | |
260 | TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ | |
261 | TRF7970A_IRQ_STATUS_PARITY_ERROR | \ | |
262 | TRF7970A_IRQ_STATUS_CRC_ERROR) | |
263 | ||
264 | #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) | |
265 | #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) | |
266 | #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) | |
267 | #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) | |
268 | #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) | |
269 | #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) | |
270 | ||
271 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) | |
272 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) | |
273 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) | |
274 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) | |
275 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 | |
276 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 | |
277 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 | |
278 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 | |
279 | ||
280 | #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) | |
281 | ||
282 | /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ | |
283 | #define NFC_T2T_CMD_READ 0x30 | |
284 | ||
9d9304b3 MG |
285 | /* ISO 15693 commands codes */ |
286 | #define ISO15693_CMD_INVENTORY 0x01 | |
287 | #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 | |
288 | #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 | |
289 | #define ISO15693_CMD_LOCK_BLOCK 0x22 | |
290 | #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 | |
291 | #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 | |
292 | #define ISO15693_CMD_SELECT 0x25 | |
293 | #define ISO15693_CMD_RESET_TO_READY 0x26 | |
294 | #define ISO15693_CMD_WRITE_AFI 0x27 | |
295 | #define ISO15693_CMD_LOCK_AFI 0x28 | |
296 | #define ISO15693_CMD_WRITE_DSFID 0x29 | |
297 | #define ISO15693_CMD_LOCK_DSFID 0x2a | |
298 | #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b | |
299 | #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c | |
300 | ||
301 | /* ISO 15693 request and response flags */ | |
302 | #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) | |
303 | #define ISO15693_REQ_FLAG_DATA_RATE BIT(1) | |
304 | #define ISO15693_REQ_FLAG_INVENTORY BIT(2) | |
305 | #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) | |
306 | #define ISO15693_REQ_FLAG_SELECT BIT(4) | |
307 | #define ISO15693_REQ_FLAG_AFI BIT(4) | |
308 | #define ISO15693_REQ_FLAG_ADDRESS BIT(5) | |
309 | #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) | |
310 | #define ISO15693_REQ_FLAG_OPTION BIT(6) | |
311 | ||
312 | #define ISO15693_REQ_FLAG_SPEED_MASK \ | |
313 | (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) | |
314 | ||
165063f1 MG |
315 | enum trf7970a_state { |
316 | TRF7970A_ST_OFF, | |
317 | TRF7970A_ST_IDLE, | |
318 | TRF7970A_ST_IDLE_RX_BLOCKED, | |
319 | TRF7970A_ST_WAIT_FOR_TX_FIFO, | |
320 | TRF7970A_ST_WAIT_FOR_RX_DATA, | |
321 | TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, | |
9d9304b3 | 322 | TRF7970A_ST_WAIT_TO_ISSUE_EOF, |
165063f1 MG |
323 | TRF7970A_ST_MAX |
324 | }; | |
325 | ||
326 | struct trf7970a { | |
327 | enum trf7970a_state state; | |
328 | struct device *dev; | |
329 | struct spi_device *spi; | |
330 | struct regulator *regulator; | |
331 | struct nfc_digital_dev *ddev; | |
332 | u32 quirks; | |
333 | bool powering_up; | |
334 | bool aborting; | |
335 | struct sk_buff *tx_skb; | |
336 | struct sk_buff *rx_skb; | |
337 | nfc_digital_cmd_complete_t cb; | |
338 | void *cb_arg; | |
339 | u8 iso_ctrl; | |
49d19cc7 | 340 | u8 iso_ctrl_tech; |
165063f1 MG |
341 | u8 special_fcn_reg1; |
342 | int technology; | |
343 | int framing; | |
344 | u8 tx_cmd; | |
9d9304b3 | 345 | bool issue_eof; |
165063f1 MG |
346 | int en2_gpio; |
347 | int en_gpio; | |
348 | struct mutex lock; | |
349 | unsigned int timeout; | |
350 | bool ignore_timeout; | |
351 | struct delayed_work timeout_work; | |
352 | }; | |
353 | ||
354 | ||
355 | static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) | |
356 | { | |
357 | u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); | |
358 | int ret; | |
359 | ||
360 | dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); | |
361 | ||
362 | ret = spi_write(trf->spi, &cmd, 1); | |
363 | if (ret) | |
364 | dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, | |
365 | ret); | |
366 | return ret; | |
367 | } | |
368 | ||
369 | static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) | |
370 | { | |
371 | u8 addr = TRF7970A_CMD_BIT_RW | reg; | |
372 | int ret; | |
373 | ||
374 | ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); | |
375 | if (ret) | |
376 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, | |
377 | ret); | |
378 | ||
379 | dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); | |
380 | ||
381 | return ret; | |
382 | } | |
383 | ||
384 | static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, | |
385 | u8 *buf, size_t len) | |
386 | { | |
387 | u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; | |
388 | int ret; | |
389 | ||
390 | dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); | |
391 | ||
392 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, len); | |
393 | if (ret) | |
394 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, | |
395 | ret); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) | |
400 | { | |
401 | u8 buf[2] = { reg, val }; | |
402 | int ret; | |
403 | ||
404 | dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); | |
405 | ||
406 | ret = spi_write(trf->spi, buf, 2); | |
407 | if (ret) | |
408 | dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, | |
409 | buf[0], buf[1], ret); | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) | |
415 | { | |
416 | int ret; | |
417 | u8 buf[2]; | |
418 | u8 addr; | |
419 | ||
420 | addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; | |
421 | ||
422 | if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ_ERRATA) { | |
423 | addr |= TRF7970A_CMD_BIT_CONTINUOUS; | |
424 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); | |
425 | } else { | |
426 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); | |
427 | } | |
428 | ||
429 | if (ret) | |
430 | dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", | |
431 | __func__, ret); | |
432 | else | |
433 | *status = buf[0]; | |
434 | ||
435 | return ret; | |
436 | } | |
437 | ||
438 | static void trf7970a_send_upstream(struct trf7970a *trf) | |
439 | { | |
440 | u8 rssi; | |
441 | ||
442 | dev_kfree_skb_any(trf->tx_skb); | |
443 | trf->tx_skb = NULL; | |
444 | ||
445 | if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) | |
446 | print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, | |
447 | 16, 1, trf->rx_skb->data, trf->rx_skb->len, | |
448 | false); | |
449 | ||
450 | /* According to the manual it is "good form" to reset the fifo and | |
451 | * read the RSSI levels & oscillator status register here. It doesn't | |
452 | * explain why. | |
453 | */ | |
454 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
455 | trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); | |
456 | ||
457 | trf->state = TRF7970A_ST_IDLE; | |
458 | ||
459 | if (trf->aborting) { | |
460 | dev_dbg(trf->dev, "Abort process complete\n"); | |
461 | ||
462 | if (!IS_ERR(trf->rx_skb)) { | |
463 | kfree_skb(trf->rx_skb); | |
464 | trf->rx_skb = ERR_PTR(-ECANCELED); | |
465 | } | |
466 | ||
467 | trf->aborting = false; | |
468 | } | |
469 | ||
470 | trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); | |
471 | ||
472 | trf->rx_skb = NULL; | |
473 | } | |
474 | ||
475 | static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) | |
476 | { | |
477 | dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); | |
478 | ||
479 | kfree_skb(trf->rx_skb); | |
480 | trf->rx_skb = ERR_PTR(errno); | |
481 | ||
482 | trf7970a_send_upstream(trf); | |
483 | } | |
484 | ||
485 | static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, | |
486 | unsigned int len) | |
487 | { | |
488 | unsigned int timeout; | |
489 | int ret; | |
490 | ||
491 | print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, | |
492 | 16, 1, skb->data, len, false); | |
493 | ||
494 | ret = spi_write(trf->spi, skb->data, len); | |
495 | if (ret) { | |
496 | dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, | |
497 | ret); | |
498 | return ret; | |
499 | } | |
500 | ||
501 | skb_pull(skb, len); | |
502 | ||
503 | if (skb->len > 0) { | |
504 | trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; | |
505 | timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; | |
506 | } else { | |
9d9304b3 MG |
507 | if (trf->issue_eof) { |
508 | trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; | |
509 | timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; | |
510 | } else { | |
511 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; | |
512 | timeout = trf->timeout; | |
513 | } | |
165063f1 MG |
514 | } |
515 | ||
516 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, | |
517 | trf->state); | |
518 | ||
519 | schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static void trf7970a_fill_fifo(struct trf7970a *trf) | |
525 | { | |
526 | struct sk_buff *skb = trf->tx_skb; | |
527 | unsigned int len; | |
528 | int ret; | |
529 | u8 fifo_bytes; | |
530 | ||
531 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
532 | if (ret) { | |
533 | trf7970a_send_err_upstream(trf, ret); | |
534 | return; | |
535 | } | |
536 | ||
537 | dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); | |
538 | ||
539 | if (fifo_bytes & TRF7970A_FIFO_STATUS_OVERFLOW) { | |
540 | dev_err(trf->dev, "%s - fifo overflow: 0x%x\n", __func__, | |
541 | fifo_bytes); | |
542 | trf7970a_send_err_upstream(trf, -EIO); | |
543 | return; | |
544 | } | |
545 | ||
546 | /* Calculate how much more data can be written to the fifo */ | |
547 | len = TRF7970A_FIFO_SIZE - fifo_bytes; | |
548 | len = min(skb->len, len); | |
549 | ||
550 | ret = trf7970a_transmit(trf, skb, len); | |
551 | if (ret) | |
552 | trf7970a_send_err_upstream(trf, ret); | |
553 | } | |
554 | ||
555 | static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) | |
556 | { | |
557 | struct sk_buff *skb = trf->rx_skb; | |
558 | int ret; | |
559 | u8 fifo_bytes; | |
560 | ||
561 | if (status & TRF7970A_IRQ_STATUS_ERROR) { | |
562 | trf7970a_send_err_upstream(trf, -EIO); | |
563 | return; | |
564 | } | |
565 | ||
566 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
567 | if (ret) { | |
568 | trf7970a_send_err_upstream(trf, ret); | |
569 | return; | |
570 | } | |
571 | ||
572 | dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); | |
573 | ||
574 | if (!fifo_bytes) | |
575 | goto no_rx_data; | |
576 | ||
577 | if (fifo_bytes & TRF7970A_FIFO_STATUS_OVERFLOW) { | |
578 | dev_err(trf->dev, "%s - fifo overflow: 0x%x\n", __func__, | |
579 | fifo_bytes); | |
580 | trf7970a_send_err_upstream(trf, -EIO); | |
581 | return; | |
582 | } | |
583 | ||
584 | if (fifo_bytes > skb_tailroom(skb)) { | |
585 | skb = skb_copy_expand(skb, skb_headroom(skb), | |
586 | max_t(int, fifo_bytes, | |
587 | TRF7970A_RX_SKB_ALLOC_SIZE), | |
588 | GFP_KERNEL); | |
589 | if (!skb) { | |
590 | trf7970a_send_err_upstream(trf, -ENOMEM); | |
591 | return; | |
592 | } | |
593 | ||
594 | kfree_skb(trf->rx_skb); | |
595 | trf->rx_skb = skb; | |
596 | } | |
597 | ||
598 | ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, | |
599 | skb_put(skb, fifo_bytes), fifo_bytes); | |
600 | if (ret) { | |
601 | trf7970a_send_err_upstream(trf, ret); | |
602 | return; | |
603 | } | |
604 | ||
605 | /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ | |
606 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && | |
607 | (trf->special_fcn_reg1 == | |
608 | TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { | |
609 | skb->data[0] >>= 4; | |
610 | status = TRF7970A_IRQ_STATUS_SRX; | |
611 | } else { | |
612 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; | |
613 | } | |
614 | ||
615 | no_rx_data: | |
616 | if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ | |
617 | trf7970a_send_upstream(trf); | |
618 | return; | |
619 | } | |
620 | ||
621 | dev_dbg(trf->dev, "Setting timeout for %d ms\n", | |
622 | TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); | |
623 | ||
624 | schedule_delayed_work(&trf->timeout_work, | |
625 | msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); | |
626 | } | |
627 | ||
628 | static irqreturn_t trf7970a_irq(int irq, void *dev_id) | |
629 | { | |
630 | struct trf7970a *trf = dev_id; | |
631 | int ret; | |
632 | u8 status; | |
633 | ||
634 | mutex_lock(&trf->lock); | |
635 | ||
636 | if (trf->state == TRF7970A_ST_OFF) { | |
637 | mutex_unlock(&trf->lock); | |
638 | return IRQ_NONE; | |
639 | } | |
640 | ||
641 | ret = trf7970a_read_irqstatus(trf, &status); | |
642 | if (ret) { | |
643 | mutex_unlock(&trf->lock); | |
644 | return IRQ_NONE; | |
645 | } | |
646 | ||
647 | dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, | |
648 | status); | |
649 | ||
650 | if (!status) { | |
651 | mutex_unlock(&trf->lock); | |
652 | return IRQ_NONE; | |
653 | } | |
654 | ||
655 | switch (trf->state) { | |
656 | case TRF7970A_ST_IDLE: | |
657 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
658 | /* If getting interrupts caused by RF noise, turn off the | |
659 | * receiver to avoid unnecessary interrupts. It will be | |
660 | * turned back on in trf7970a_in_send_cmd() when the next | |
661 | * command is issued. | |
662 | */ | |
663 | if (status & TRF7970A_IRQ_STATUS_ERROR) { | |
664 | trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); | |
665 | trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; | |
666 | } | |
667 | ||
668 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
669 | break; | |
670 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
671 | if (status & TRF7970A_IRQ_STATUS_TX) { | |
672 | trf->ignore_timeout = | |
673 | !cancel_delayed_work(&trf->timeout_work); | |
674 | trf7970a_fill_fifo(trf); | |
675 | } else { | |
676 | trf7970a_send_err_upstream(trf, -EIO); | |
677 | } | |
678 | break; | |
679 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
680 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
681 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
682 | trf->ignore_timeout = | |
683 | !cancel_delayed_work(&trf->timeout_work); | |
684 | trf7970a_drain_fifo(trf, status); | |
4dd836e4 MG |
685 | } else if (status == TRF7970A_IRQ_STATUS_TX) { |
686 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
687 | } else { | |
165063f1 MG |
688 | trf7970a_send_err_upstream(trf, -EIO); |
689 | } | |
690 | break; | |
9d9304b3 MG |
691 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
692 | if (status != TRF7970A_IRQ_STATUS_TX) | |
693 | trf7970a_send_err_upstream(trf, -EIO); | |
694 | break; | |
165063f1 MG |
695 | default: |
696 | dev_err(trf->dev, "%s - Driver in invalid state: %d\n", | |
697 | __func__, trf->state); | |
698 | } | |
699 | ||
700 | mutex_unlock(&trf->lock); | |
701 | return IRQ_HANDLED; | |
702 | } | |
703 | ||
9d9304b3 MG |
704 | static void trf7970a_issue_eof(struct trf7970a *trf) |
705 | { | |
706 | int ret; | |
707 | ||
708 | dev_dbg(trf->dev, "Issuing EOF\n"); | |
709 | ||
710 | ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
711 | if (ret) | |
712 | trf7970a_send_err_upstream(trf, ret); | |
713 | ||
714 | ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); | |
715 | if (ret) | |
716 | trf7970a_send_err_upstream(trf, ret); | |
717 | ||
718 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; | |
719 | ||
720 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", | |
721 | trf->timeout, trf->state); | |
722 | ||
723 | schedule_delayed_work(&trf->timeout_work, | |
724 | msecs_to_jiffies(trf->timeout)); | |
725 | } | |
726 | ||
165063f1 MG |
727 | static void trf7970a_timeout_work_handler(struct work_struct *work) |
728 | { | |
729 | struct trf7970a *trf = container_of(work, struct trf7970a, | |
730 | timeout_work.work); | |
731 | ||
732 | dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", | |
733 | trf->state, trf->ignore_timeout); | |
734 | ||
735 | mutex_lock(&trf->lock); | |
736 | ||
737 | if (trf->ignore_timeout) | |
738 | trf->ignore_timeout = false; | |
739 | else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) | |
740 | trf7970a_send_upstream(trf); /* No more rx data so send up */ | |
9d9304b3 MG |
741 | else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) |
742 | trf7970a_issue_eof(trf); | |
165063f1 MG |
743 | else |
744 | trf7970a_send_err_upstream(trf, -ETIMEDOUT); | |
745 | ||
746 | mutex_unlock(&trf->lock); | |
747 | } | |
748 | ||
749 | static int trf7970a_init(struct trf7970a *trf) | |
750 | { | |
751 | int ret; | |
752 | ||
753 | dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); | |
754 | ||
755 | ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); | |
756 | if (ret) | |
757 | goto err_out; | |
758 | ||
759 | ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); | |
760 | if (ret) | |
761 | goto err_out; | |
762 | ||
b887eb09 MG |
763 | /* Must clear NFC Target Detection Level reg due to erratum */ |
764 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); | |
765 | if (ret) | |
766 | goto err_out; | |
767 | ||
165063f1 MG |
768 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
769 | TRF7970A_MODULATOR_DEPTH_OOK); | |
770 | if (ret) | |
771 | goto err_out; | |
772 | ||
773 | ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, | |
774 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | | |
775 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); | |
776 | if (ret) | |
777 | goto err_out; | |
778 | ||
779 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); | |
780 | if (ret) | |
781 | goto err_out; | |
782 | ||
783 | trf->special_fcn_reg1 = 0; | |
784 | ||
785 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
786 | TRF7970A_CHIP_STATUS_RF_ON | | |
787 | TRF7970A_CHIP_STATUS_VRS5_3); | |
788 | if (ret) | |
789 | goto err_out; | |
790 | ||
49d19cc7 | 791 | trf->iso_ctrl = 0xff; |
165063f1 MG |
792 | return 0; |
793 | ||
794 | err_out: | |
795 | dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); | |
796 | return ret; | |
797 | } | |
798 | ||
799 | static void trf7970a_switch_rf_off(struct trf7970a *trf) | |
800 | { | |
801 | dev_dbg(trf->dev, "Switching rf off\n"); | |
802 | ||
803 | gpio_set_value(trf->en_gpio, 0); | |
804 | gpio_set_value(trf->en2_gpio, 0); | |
805 | ||
806 | trf->aborting = false; | |
807 | trf->state = TRF7970A_ST_OFF; | |
808 | } | |
809 | ||
810 | static int trf7970a_switch_rf_on(struct trf7970a *trf) | |
811 | { | |
812 | unsigned long delay; | |
813 | int ret; | |
814 | ||
815 | dev_dbg(trf->dev, "Switching rf on\n"); | |
816 | ||
817 | if (trf->powering_up) | |
818 | usleep_range(5000, 6000); | |
819 | ||
820 | gpio_set_value(trf->en2_gpio, 1); | |
821 | usleep_range(1000, 2000); | |
822 | gpio_set_value(trf->en_gpio, 1); | |
823 | ||
824 | /* The delay between enabling the trf7970a and issuing the first | |
825 | * command is significantly longer the very first time after powering | |
826 | * up. Make sure the longer delay is only done the first time. | |
827 | */ | |
828 | if (trf->powering_up) { | |
829 | delay = 20000; | |
830 | trf->powering_up = false; | |
831 | } else { | |
832 | delay = 5000; | |
833 | } | |
834 | ||
835 | usleep_range(delay, delay + 1000); | |
836 | ||
837 | ret = trf7970a_init(trf); | |
838 | if (ret) | |
839 | trf7970a_switch_rf_off(trf); | |
840 | else | |
841 | trf->state = TRF7970A_ST_IDLE; | |
842 | ||
843 | return ret; | |
844 | } | |
845 | ||
846 | static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) | |
847 | { | |
848 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
849 | int ret = 0; | |
850 | ||
851 | dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); | |
852 | ||
853 | mutex_lock(&trf->lock); | |
854 | ||
855 | if (on) { | |
856 | switch (trf->state) { | |
857 | case TRF7970A_ST_OFF: | |
858 | ret = trf7970a_switch_rf_on(trf); | |
859 | break; | |
860 | case TRF7970A_ST_IDLE: | |
861 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
862 | break; | |
863 | default: | |
864 | dev_err(trf->dev, "%s - Invalid request: %d %d\n", | |
865 | __func__, trf->state, on); | |
866 | trf7970a_switch_rf_off(trf); | |
867 | } | |
868 | } else { | |
869 | switch (trf->state) { | |
870 | case TRF7970A_ST_OFF: | |
871 | break; | |
872 | default: | |
873 | dev_err(trf->dev, "%s - Invalid request: %d %d\n", | |
874 | __func__, trf->state, on); | |
875 | /* FALLTHROUGH */ | |
876 | case TRF7970A_ST_IDLE: | |
877 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
878 | trf7970a_switch_rf_off(trf); | |
879 | } | |
880 | } | |
881 | ||
882 | mutex_unlock(&trf->lock); | |
883 | return ret; | |
884 | } | |
885 | ||
886 | static int trf7970a_config_rf_tech(struct trf7970a *trf, int tech) | |
887 | { | |
888 | int ret = 0; | |
889 | ||
890 | dev_dbg(trf->dev, "rf technology: %d\n", tech); | |
891 | ||
892 | switch (tech) { | |
893 | case NFC_DIGITAL_RF_TECH_106A: | |
49d19cc7 | 894 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; |
165063f1 | 895 | break; |
9d9304b3 | 896 | case NFC_DIGITAL_RF_TECH_ISO15693: |
49d19cc7 | 897 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; |
9d9304b3 | 898 | break; |
165063f1 MG |
899 | default: |
900 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); | |
901 | return -EINVAL; | |
902 | } | |
903 | ||
904 | trf->technology = tech; | |
905 | ||
906 | return ret; | |
907 | } | |
908 | ||
909 | static int trf7970a_config_framing(struct trf7970a *trf, int framing) | |
910 | { | |
49d19cc7 MG |
911 | u8 iso_ctrl = trf->iso_ctrl_tech; |
912 | int ret; | |
913 | ||
165063f1 MG |
914 | dev_dbg(trf->dev, "framing: %d\n", framing); |
915 | ||
916 | switch (framing) { | |
917 | case NFC_DIGITAL_FRAMING_NFCA_SHORT: | |
918 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
919 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
49d19cc7 | 920 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
921 | break; |
922 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
80062891 | 923 | case NFC_DIGITAL_FRAMING_NFCA_T4T: |
9d9304b3 MG |
924 | case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: |
925 | case NFC_DIGITAL_FRAMING_ISO15693_T5T: | |
165063f1 | 926 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
49d19cc7 | 927 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
928 | break; |
929 | case NFC_DIGITAL_FRAMING_NFCA_T2T: | |
930 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
49d19cc7 | 931 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
932 | break; |
933 | default: | |
934 | dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); | |
935 | return -EINVAL; | |
936 | } | |
937 | ||
938 | trf->framing = framing; | |
939 | ||
49d19cc7 MG |
940 | if (iso_ctrl != trf->iso_ctrl) { |
941 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
942 | if (ret) | |
943 | return ret; | |
944 | ||
945 | trf->iso_ctrl = iso_ctrl; | |
946 | } | |
947 | ||
948 | return 0; | |
165063f1 MG |
949 | } |
950 | ||
951 | static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, | |
952 | int param) | |
953 | { | |
954 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
955 | int ret = 0; | |
956 | ||
957 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); | |
958 | ||
959 | mutex_lock(&trf->lock); | |
960 | ||
961 | if (trf->state == TRF7970A_ST_OFF) { | |
962 | ret = trf7970a_switch_rf_on(trf); | |
963 | if (ret) | |
964 | goto err_out; | |
965 | } | |
966 | ||
967 | switch (type) { | |
968 | case NFC_DIGITAL_CONFIG_RF_TECH: | |
969 | ret = trf7970a_config_rf_tech(trf, param); | |
970 | break; | |
971 | case NFC_DIGITAL_CONFIG_FRAMING: | |
972 | ret = trf7970a_config_framing(trf, param); | |
973 | break; | |
974 | default: | |
975 | dev_dbg(trf->dev, "Unknown type: %d\n", type); | |
976 | ret = -EINVAL; | |
977 | } | |
978 | ||
979 | err_out: | |
980 | mutex_unlock(&trf->lock); | |
981 | return ret; | |
982 | } | |
983 | ||
9d9304b3 MG |
984 | static int trf7970a_is_iso15693_write_or_lock(u8 cmd) |
985 | { | |
986 | switch (cmd) { | |
987 | case ISO15693_CMD_WRITE_SINGLE_BLOCK: | |
988 | case ISO15693_CMD_LOCK_BLOCK: | |
989 | case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: | |
990 | case ISO15693_CMD_WRITE_AFI: | |
991 | case ISO15693_CMD_LOCK_AFI: | |
992 | case ISO15693_CMD_WRITE_DSFID: | |
993 | case ISO15693_CMD_LOCK_DSFID: | |
994 | return 1; | |
995 | break; | |
996 | default: | |
997 | return 0; | |
998 | } | |
999 | } | |
1000 | ||
165063f1 MG |
1001 | static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) |
1002 | { | |
1003 | u8 *req = skb->data; | |
9d9304b3 | 1004 | u8 special_fcn_reg1, iso_ctrl; |
165063f1 MG |
1005 | int ret; |
1006 | ||
9d9304b3 MG |
1007 | trf->issue_eof = false; |
1008 | ||
165063f1 MG |
1009 | /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in |
1010 | * special functions register 1 is cleared; otherwise, its a write or | |
1011 | * sector select command and '4_bit_RX' must be set. | |
9d9304b3 MG |
1012 | * |
1013 | * When issuing an ISO 15693 command, inspect the flags byte to see | |
1014 | * what speed to use. Also, remember if the OPTION flag is set on | |
1015 | * a Type 5 write or lock command so the driver will know that it | |
1016 | * has to send an EOF in order to get a response. | |
165063f1 MG |
1017 | */ |
1018 | if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && | |
1019 | (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { | |
1020 | if (req[0] == NFC_T2T_CMD_READ) | |
1021 | special_fcn_reg1 = 0; | |
1022 | else | |
1023 | special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; | |
1024 | ||
1025 | if (special_fcn_reg1 != trf->special_fcn_reg1) { | |
1026 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, | |
1027 | special_fcn_reg1); | |
1028 | if (ret) | |
1029 | return ret; | |
1030 | ||
1031 | trf->special_fcn_reg1 = special_fcn_reg1; | |
1032 | } | |
9d9304b3 MG |
1033 | } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { |
1034 | iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; | |
1035 | ||
1036 | switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { | |
1037 | case 0x00: | |
1038 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; | |
1039 | break; | |
1040 | case ISO15693_REQ_FLAG_SUB_CARRIER: | |
1041 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; | |
1042 | break; | |
1043 | case ISO15693_REQ_FLAG_DATA_RATE: | |
1044 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; | |
1045 | break; | |
1046 | case (ISO15693_REQ_FLAG_SUB_CARRIER | | |
1047 | ISO15693_REQ_FLAG_DATA_RATE): | |
1048 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; | |
1049 | break; | |
1050 | } | |
1051 | ||
1052 | if (iso_ctrl != trf->iso_ctrl) { | |
1053 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1054 | if (ret) | |
1055 | return ret; | |
1056 | ||
1057 | trf->iso_ctrl = iso_ctrl; | |
1058 | } | |
1059 | ||
1060 | if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) && | |
1061 | trf7970a_is_iso15693_write_or_lock(req[1]) && | |
1062 | (req[0] & ISO15693_REQ_FLAG_OPTION)) | |
1063 | trf->issue_eof = true; | |
165063f1 MG |
1064 | } |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | static int trf7970a_in_send_cmd(struct nfc_digital_dev *ddev, | |
1070 | struct sk_buff *skb, u16 timeout, | |
1071 | nfc_digital_cmd_complete_t cb, void *arg) | |
1072 | { | |
1073 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1074 | char *prefix; | |
1075 | unsigned int len; | |
1076 | int ret; | |
1077 | ||
1078 | dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", | |
1079 | trf->state, timeout, skb->len); | |
1080 | ||
1081 | if (skb->len > TRF7970A_TX_MAX) | |
1082 | return -EINVAL; | |
1083 | ||
1084 | mutex_lock(&trf->lock); | |
1085 | ||
1086 | if ((trf->state != TRF7970A_ST_IDLE) && | |
1087 | (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { | |
1088 | dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, | |
1089 | trf->state); | |
1090 | ret = -EIO; | |
1091 | goto out_err; | |
1092 | } | |
1093 | ||
1094 | if (trf->aborting) { | |
1095 | dev_dbg(trf->dev, "Abort process complete\n"); | |
1096 | trf->aborting = false; | |
1097 | ret = -ECANCELED; | |
1098 | goto out_err; | |
1099 | } | |
1100 | ||
1101 | trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, | |
1102 | GFP_KERNEL); | |
1103 | if (!trf->rx_skb) { | |
1104 | dev_dbg(trf->dev, "Can't alloc rx_skb\n"); | |
1105 | ret = -ENOMEM; | |
1106 | goto out_err; | |
1107 | } | |
1108 | ||
1109 | if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { | |
1110 | ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); | |
1111 | if (ret) | |
1112 | goto out_err; | |
1113 | ||
1114 | trf->state = TRF7970A_ST_IDLE; | |
1115 | } | |
1116 | ||
1117 | ret = trf7970a_per_cmd_config(trf, skb); | |
1118 | if (ret) | |
1119 | goto out_err; | |
1120 | ||
1121 | trf->ddev = ddev; | |
1122 | trf->tx_skb = skb; | |
1123 | trf->cb = cb; | |
1124 | trf->cb_arg = arg; | |
1125 | trf->timeout = timeout; | |
1126 | trf->ignore_timeout = false; | |
1127 | ||
1128 | len = skb->len; | |
1129 | prefix = skb_push(skb, TRF7970A_TX_SKB_HEADROOM); | |
1130 | ||
1131 | /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends | |
1132 | * on what the current framing is, the address of the TX length byte 1 | |
1133 | * register (0x1d), and the 2 byte length of the data to be transmitted. | |
1134 | */ | |
1135 | prefix[0] = TRF7970A_CMD_BIT_CTRL | | |
1136 | TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); | |
1137 | prefix[1] = TRF7970A_CMD_BIT_CTRL | | |
1138 | TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); | |
1139 | prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; | |
1140 | ||
1141 | if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { | |
1142 | prefix[3] = 0x00; | |
1143 | prefix[4] = 0x0f; /* 7 bits */ | |
1144 | } else { | |
1145 | prefix[3] = (len & 0xf00) >> 4; | |
1146 | prefix[3] |= ((len & 0xf0) >> 4); | |
1147 | prefix[4] = ((len & 0x0f) << 4); | |
1148 | } | |
1149 | ||
1150 | len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); | |
1151 | ||
1152 | usleep_range(1000, 2000); | |
1153 | ||
1154 | ret = trf7970a_transmit(trf, skb, len); | |
1155 | if (ret) { | |
1156 | kfree_skb(trf->rx_skb); | |
1157 | trf->rx_skb = NULL; | |
1158 | } | |
1159 | ||
1160 | out_err: | |
1161 | mutex_unlock(&trf->lock); | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, | |
1166 | int type, int param) | |
1167 | { | |
1168 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1169 | ||
1170 | dev_dbg(trf->dev, "Unsupported interface\n"); | |
1171 | ||
1172 | return -EINVAL; | |
1173 | } | |
1174 | ||
1175 | static int trf7970a_tg_send_cmd(struct nfc_digital_dev *ddev, | |
1176 | struct sk_buff *skb, u16 timeout, | |
1177 | nfc_digital_cmd_complete_t cb, void *arg) | |
1178 | { | |
1179 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1180 | ||
1181 | dev_dbg(trf->dev, "Unsupported interface\n"); | |
1182 | ||
1183 | return -EINVAL; | |
1184 | } | |
1185 | ||
1186 | static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, | |
1187 | u16 timeout, nfc_digital_cmd_complete_t cb, void *arg) | |
1188 | { | |
1189 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1190 | ||
1191 | dev_dbg(trf->dev, "Unsupported interface\n"); | |
1192 | ||
1193 | return -EINVAL; | |
1194 | } | |
1195 | ||
1196 | static int trf7970a_tg_listen_mdaa(struct nfc_digital_dev *ddev, | |
1197 | struct digital_tg_mdaa_params *mdaa_params, | |
1198 | u16 timeout, nfc_digital_cmd_complete_t cb, void *arg) | |
1199 | { | |
1200 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1201 | ||
1202 | dev_dbg(trf->dev, "Unsupported interface\n"); | |
1203 | ||
1204 | return -EINVAL; | |
1205 | } | |
1206 | ||
1207 | static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) | |
1208 | { | |
1209 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1210 | ||
1211 | dev_dbg(trf->dev, "Abort process initiated\n"); | |
1212 | ||
1213 | mutex_lock(&trf->lock); | |
5876bc75 MG |
1214 | |
1215 | switch (trf->state) { | |
1216 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
1217 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
1218 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
1219 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: | |
1220 | trf->aborting = true; | |
1221 | break; | |
1222 | default: | |
1223 | break; | |
1224 | } | |
1225 | ||
165063f1 MG |
1226 | mutex_unlock(&trf->lock); |
1227 | } | |
1228 | ||
1229 | static struct nfc_digital_ops trf7970a_nfc_ops = { | |
1230 | .in_configure_hw = trf7970a_in_configure_hw, | |
1231 | .in_send_cmd = trf7970a_in_send_cmd, | |
1232 | .tg_configure_hw = trf7970a_tg_configure_hw, | |
1233 | .tg_send_cmd = trf7970a_tg_send_cmd, | |
1234 | .tg_listen = trf7970a_tg_listen, | |
1235 | .tg_listen_mdaa = trf7970a_tg_listen_mdaa, | |
1236 | .switch_rf = trf7970a_switch_rf, | |
1237 | .abort_cmd = trf7970a_abort_cmd, | |
1238 | }; | |
1239 | ||
1240 | static int trf7970a_probe(struct spi_device *spi) | |
1241 | { | |
1242 | struct device_node *np = spi->dev.of_node; | |
1243 | const struct spi_device_id *id = spi_get_device_id(spi); | |
1244 | struct trf7970a *trf; | |
1245 | int ret; | |
1246 | ||
1247 | if (!np) { | |
1248 | dev_err(&spi->dev, "No Device Tree entry\n"); | |
1249 | return -EINVAL; | |
1250 | } | |
1251 | ||
1252 | trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); | |
1253 | if (!trf) | |
1254 | return -ENOMEM; | |
1255 | ||
1256 | trf->state = TRF7970A_ST_OFF; | |
1257 | trf->dev = &spi->dev; | |
1258 | trf->spi = spi; | |
1259 | trf->quirks = id->driver_data; | |
1260 | ||
1261 | spi->mode = SPI_MODE_1; | |
1262 | spi->bits_per_word = 8; | |
1263 | ||
1264 | /* There are two enable pins - both must be present */ | |
1265 | trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0); | |
1266 | if (!gpio_is_valid(trf->en_gpio)) { | |
1267 | dev_err(trf->dev, "No EN GPIO property\n"); | |
1268 | return trf->en_gpio; | |
1269 | } | |
1270 | ||
1271 | ret = devm_gpio_request_one(trf->dev, trf->en_gpio, | |
1272 | GPIOF_DIR_OUT | GPIOF_INIT_LOW, "EN"); | |
1273 | if (ret) { | |
1274 | dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret); | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1); | |
1279 | if (!gpio_is_valid(trf->en2_gpio)) { | |
1280 | dev_err(trf->dev, "No EN2 GPIO property\n"); | |
1281 | return trf->en2_gpio; | |
1282 | } | |
1283 | ||
1284 | ret = devm_gpio_request_one(trf->dev, trf->en2_gpio, | |
1285 | GPIOF_DIR_OUT | GPIOF_INIT_LOW, "EN2"); | |
1286 | if (ret) { | |
1287 | dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret); | |
1288 | return ret; | |
1289 | } | |
1290 | ||
1291 | ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, | |
1292 | trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
1293 | "trf7970a", trf); | |
1294 | if (ret) { | |
1295 | dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); | |
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | mutex_init(&trf->lock); | |
1300 | INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); | |
1301 | ||
1302 | trf->regulator = devm_regulator_get(&spi->dev, "vin"); | |
1303 | if (IS_ERR(trf->regulator)) { | |
1304 | ret = PTR_ERR(trf->regulator); | |
1305 | dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); | |
1306 | goto err_destroy_lock; | |
1307 | } | |
1308 | ||
1309 | ret = regulator_enable(trf->regulator); | |
1310 | if (ret) { | |
1311 | dev_err(trf->dev, "Can't enable VIN: %d\n", ret); | |
1312 | goto err_destroy_lock; | |
1313 | } | |
1314 | ||
1315 | trf->powering_up = true; | |
1316 | ||
1317 | trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, | |
1318 | TRF7970A_SUPPORTED_PROTOCOLS, | |
1319 | NFC_DIGITAL_DRV_CAPS_IN_CRC, TRF7970A_TX_SKB_HEADROOM, | |
1320 | 0); | |
1321 | if (!trf->ddev) { | |
1322 | dev_err(trf->dev, "Can't allocate NFC digital device\n"); | |
1323 | ret = -ENOMEM; | |
1324 | goto err_disable_regulator; | |
1325 | } | |
1326 | ||
1327 | nfc_digital_set_parent_dev(trf->ddev, trf->dev); | |
1328 | nfc_digital_set_drvdata(trf->ddev, trf); | |
1329 | spi_set_drvdata(spi, trf); | |
1330 | ||
1331 | ret = nfc_digital_register_device(trf->ddev); | |
1332 | if (ret) { | |
1333 | dev_err(trf->dev, "Can't register NFC digital device: %d\n", | |
1334 | ret); | |
1335 | goto err_free_ddev; | |
1336 | } | |
1337 | ||
1338 | return 0; | |
1339 | ||
1340 | err_free_ddev: | |
1341 | nfc_digital_free_device(trf->ddev); | |
1342 | err_disable_regulator: | |
1343 | regulator_disable(trf->regulator); | |
1344 | err_destroy_lock: | |
1345 | mutex_destroy(&trf->lock); | |
1346 | return ret; | |
1347 | } | |
1348 | ||
1349 | static int trf7970a_remove(struct spi_device *spi) | |
1350 | { | |
1351 | struct trf7970a *trf = spi_get_drvdata(spi); | |
1352 | ||
1353 | mutex_lock(&trf->lock); | |
1354 | ||
1355 | trf7970a_switch_rf_off(trf); | |
1356 | trf7970a_init(trf); | |
1357 | ||
1358 | switch (trf->state) { | |
1359 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
1360 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
1361 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
9d9304b3 | 1362 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
165063f1 MG |
1363 | trf7970a_send_err_upstream(trf, -ECANCELED); |
1364 | break; | |
1365 | default: | |
1366 | break; | |
1367 | } | |
1368 | ||
1369 | mutex_unlock(&trf->lock); | |
1370 | ||
1371 | nfc_digital_unregister_device(trf->ddev); | |
1372 | nfc_digital_free_device(trf->ddev); | |
1373 | ||
1374 | regulator_disable(trf->regulator); | |
1375 | ||
1376 | mutex_destroy(&trf->lock); | |
1377 | ||
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | static const struct spi_device_id trf7970a_id_table[] = { | |
1382 | { "trf7970a", TRF7970A_QUIRK_IRQ_STATUS_READ_ERRATA }, | |
1383 | { } | |
1384 | }; | |
1385 | MODULE_DEVICE_TABLE(spi, trf7970a_id_table); | |
1386 | ||
1387 | static struct spi_driver trf7970a_spi_driver = { | |
1388 | .probe = trf7970a_probe, | |
1389 | .remove = trf7970a_remove, | |
1390 | .id_table = trf7970a_id_table, | |
1391 | .driver = { | |
1392 | .name = "trf7970a", | |
1393 | .owner = THIS_MODULE, | |
1394 | }, | |
1395 | }; | |
1396 | ||
1397 | module_spi_driver(trf7970a_spi_driver); | |
1398 | ||
1399 | MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); | |
1400 | MODULE_LICENSE("GPL v2"); | |
1401 | MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); |