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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> | |
e6403b7c | 19 | #include <linux/pm_runtime.h> |
165063f1 MG |
20 | #include <linux/nfc.h> |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/delay.h> | |
d34e48d6 | 23 | #include <linux/gpio/consumer.h> |
165063f1 | 24 | #include <linux/of.h> |
165063f1 MG |
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 | |
95064bd9 MG |
38 | * confirmed to work with this driver. There is a bug with the current |
39 | * version of the trf7970a that requires that EN2 remain low no matter | |
40 | * what. If it goes high, it will generate an RF field even when in | |
41 | * passive target mode. TI has indicated that the chip will work okay | |
42 | * when EN2 is left low. The 'en2-rf-quirk' device tree property | |
43 | * indicates that trf7970a currently being used has the erratum and | |
44 | * that EN2 must be kept low. | |
165063f1 MG |
45 | * |
46 | * Timeouts are implemented using the delayed workqueue kernel facility. | |
47 | * Timeouts are required so things don't hang when there is no response | |
48 | * from the trf7970a (or tag). Using this mechanism creates a race with | |
49 | * interrupts, however. That is, an interrupt and a timeout could occur | |
50 | * closely enough together that one is blocked by the mutex while the other | |
51 | * executes. When the timeout handler executes first and blocks the | |
52 | * interrupt handler, it will eventually set the state to IDLE so the | |
53 | * interrupt handler will check the state and exit with no harm done. | |
54 | * When the interrupt handler executes first and blocks the timeout handler, | |
55 | * the cancel_delayed_work() call will know that it didn't cancel the | |
56 | * work item (i.e., timeout) and will return zero. That return code is | |
57 | * used by the timer handler to indicate that it should ignore the timeout | |
58 | * once its unblocked. | |
59 | * | |
60 | * Aborting an active command isn't as simple as it seems because the only | |
61 | * way to abort a command that's already been sent to the tag is so turn | |
62 | * off power to the tag. If we do that, though, we'd have to go through | |
63 | * the entire anticollision procedure again but the digital layer doesn't | |
13b4272a | 64 | * support that. So, if an abort is received before trf7970a_send_cmd() |
165063f1 MG |
65 | * has sent the command to the tag, it simply returns -ECANCELED. If the |
66 | * command has already been sent to the tag, then the driver continues | |
67 | * normally and recieves the response data (or error) but just before | |
68 | * sending the data upstream, it frees the rx_skb and sends -ECANCELED | |
69 | * upstream instead. If the command failed, that error will be sent | |
70 | * upstream. | |
71 | * | |
72 | * When recieving data from a tag and the interrupt status register has | |
73 | * only the SRX bit set, it means that all of the data has been received | |
74 | * (once what's in the fifo has been read). However, depending on timing | |
75 | * an interrupt status with only the SRX bit set may not be recived. In | |
5fa3af35 MG |
76 | * those cases, the timeout mechanism is used to wait 20 ms in case more |
77 | * data arrives. After 20 ms, it is assumed that all of the data has been | |
165063f1 MG |
78 | * received and the accumulated rx data is sent upstream. The |
79 | * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose | |
80 | * (i.e., it indicates that some data has been received but we're not sure | |
81 | * if there is more coming so a timeout in this state means all data has | |
5fa3af35 MG |
82 | * been received and there isn't an error). The delay is 20 ms since delays |
83 | * of ~16 ms have been observed during testing. | |
165063f1 | 84 | * |
38b4eb1f MG |
85 | * When transmitting a frame larger than the FIFO size (127 bytes), the |
86 | * driver will wait 20 ms for the FIFO to drain past the low-watermark | |
87 | * and generate an interrupt. The low-watermark set to 32 bytes so the | |
88 | * interrupt should fire after 127 - 32 = 95 bytes have been sent. At | |
89 | * the lowest possible bit rate (6.62 kbps for 15693), it will take up | |
90 | * to ~14.35 ms so 20 ms is used for the timeout. | |
91 | * | |
165063f1 MG |
92 | * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. |
93 | * Having only 4 bits in the FIFO won't normally generate an interrupt so | |
94 | * driver enables the '4_bit_RX' bit of the Special Functions register 1 | |
95 | * to cause an interrupt in that case. Leaving that bit for a read command | |
96 | * messes up the data returned so it is only enabled when the framing is | |
97 | * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. | |
98 | * Unfortunately, that means that the driver has to peek into tx frames | |
99 | * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by | |
100 | * the trf7970a_per_cmd_config() routine. | |
9d9304b3 MG |
101 | * |
102 | * ISO/IEC 15693 frames specify whether to use single or double sub-carrier | |
103 | * frequencies and whether to use low or high data rates in the flags byte | |
104 | * of the frame. This means that the driver has to peek at all 15693 frames | |
105 | * to determine what speed to set the communication to. In addition, write | |
106 | * and lock commands use the OPTION flag to indicate that an EOF must be | |
107 | * sent to the tag before it will send its response. So the driver has to | |
108 | * examine all frames for that reason too. | |
109 | * | |
110 | * It is unclear how long to wait before sending the EOF. According to the | |
111 | * Note under Table 1-1 in section 1.6 of | |
112 | * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least | |
113 | * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long | |
38b4eb1f MG |
114 | * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain |
115 | * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to | |
116 | * ensure the wait is long enough before sending the EOF. This seems to work | |
9d9304b3 | 117 | * reliably. |
165063f1 MG |
118 | */ |
119 | ||
80062891 | 120 | #define TRF7970A_SUPPORTED_PROTOCOLS \ |
9d9304b3 | 121 | (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ |
6857bb96 | 122 | NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ |
13b4272a | 123 | NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) |
165063f1 | 124 | |
e2f0f671 | 125 | #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ |
837eb4d2 GL |
126 | #define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 |
127 | #define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 | |
128 | ||
165063f1 MG |
129 | #define TRF7970A_RX_SKB_ALLOC_SIZE 256 |
130 | ||
1568bfef | 131 | #define TRF7970A_FIFO_SIZE 127 |
165063f1 MG |
132 | |
133 | /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ | |
134 | #define TRF7970A_TX_MAX (4096 - 1) | |
135 | ||
1961843c | 136 | #define TRF7970A_WAIT_FOR_TX_IRQ 20 |
5fa3af35 | 137 | #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 |
38b4eb1f MG |
138 | #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 |
139 | #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 | |
165063f1 | 140 | |
4e64eff8 MG |
141 | /* Guard times for various RF technologies (in us) */ |
142 | #define TRF7970A_GUARD_TIME_NFCA 5000 | |
143 | #define TRF7970A_GUARD_TIME_NFCB 5000 | |
144 | #define TRF7970A_GUARD_TIME_NFCF 20000 | |
145 | #define TRF7970A_GUARD_TIME_15693 1000 | |
146 | ||
165063f1 MG |
147 | /* Quirks */ |
148 | /* Erratum: When reading IRQ Status register on trf7970a, we must issue a | |
149 | * read continuous command for IRQ Status and Collision Position registers. | |
150 | */ | |
772079eb | 151 | #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) |
95064bd9 | 152 | #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) |
ab714817 | 153 | #define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2) |
165063f1 MG |
154 | |
155 | /* Direct commands */ | |
156 | #define TRF7970A_CMD_IDLE 0x00 | |
157 | #define TRF7970A_CMD_SOFT_INIT 0x03 | |
158 | #define TRF7970A_CMD_RF_COLLISION 0x04 | |
159 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 | |
160 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 | |
161 | #define TRF7970A_CMD_FIFO_RESET 0x0f | |
162 | #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 | |
163 | #define TRF7970A_CMD_TRANSMIT 0x11 | |
164 | #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 | |
165 | #define TRF7970A_CMD_DELAY_TRANSMIT 0x13 | |
166 | #define TRF7970A_CMD_EOF 0x14 | |
167 | #define TRF7970A_CMD_CLOSE_SLOT 0x15 | |
168 | #define TRF7970A_CMD_BLOCK_RX 0x16 | |
169 | #define TRF7970A_CMD_ENABLE_RX 0x17 | |
851ee3cb MG |
170 | #define TRF7970A_CMD_TEST_INT_RF 0x18 |
171 | #define TRF7970A_CMD_TEST_EXT_RF 0x19 | |
165063f1 MG |
172 | #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a |
173 | ||
174 | /* Bits determining whether its a direct command or register R/W, | |
175 | * whether to use a continuous SPI transaction or not, and the actual | |
176 | * direct cmd opcode or regster address. | |
177 | */ | |
178 | #define TRF7970A_CMD_BIT_CTRL BIT(7) | |
179 | #define TRF7970A_CMD_BIT_RW BIT(6) | |
180 | #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) | |
181 | #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) | |
182 | ||
183 | /* Registers addresses */ | |
184 | #define TRF7970A_CHIP_STATUS_CTRL 0x00 | |
185 | #define TRF7970A_ISO_CTRL 0x01 | |
186 | #define TRF7970A_ISO14443B_TX_OPTIONS 0x02 | |
187 | #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 | |
188 | #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 | |
189 | #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 | |
190 | #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 | |
191 | #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 | |
192 | #define TRF7970A_RX_WAIT_TIME 0x08 | |
193 | #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 | |
194 | #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a | |
195 | #define TRF7970A_REG_IO_CTRL 0x0b | |
196 | #define TRF7970A_IRQ_STATUS 0x0c | |
197 | #define TRF7970A_COLLISION_IRQ_MASK 0x0d | |
198 | #define TRF7970A_COLLISION_POSITION 0x0e | |
199 | #define TRF7970A_RSSI_OSC_STATUS 0x0f | |
200 | #define TRF7970A_SPECIAL_FCN_REG1 0x10 | |
201 | #define TRF7970A_SPECIAL_FCN_REG2 0x11 | |
202 | #define TRF7970A_RAM1 0x12 | |
203 | #define TRF7970A_RAM2 0x13 | |
204 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 | |
205 | #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 | |
206 | #define TRF7970A_NFCID1 0x17 | |
207 | #define TRF7970A_NFC_TARGET_LEVEL 0x18 | |
208 | #define TRF79070A_NFC_TARGET_PROTOCOL 0x19 | |
209 | #define TRF7970A_TEST_REGISTER1 0x1a | |
210 | #define TRF7970A_TEST_REGISTER2 0x1b | |
211 | #define TRF7970A_FIFO_STATUS 0x1c | |
212 | #define TRF7970A_TX_LENGTH_BYTE1 0x1d | |
213 | #define TRF7970A_TX_LENGTH_BYTE2 0x1e | |
214 | #define TRF7970A_FIFO_IO_REGISTER 0x1f | |
215 | ||
216 | /* Chip Status Control Register Bits */ | |
217 | #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) | |
218 | #define TRF7970A_CHIP_STATUS_REC_ON BIT(1) | |
219 | #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) | |
220 | #define TRF7970A_CHIP_STATUS_PM_ON BIT(3) | |
221 | #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) | |
222 | #define TRF7970A_CHIP_STATUS_RF_ON BIT(5) | |
223 | #define TRF7970A_CHIP_STATUS_DIRECT BIT(6) | |
224 | #define TRF7970A_CHIP_STATUS_STBY BIT(7) | |
225 | ||
226 | /* ISO Control Register Bits */ | |
227 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 | |
228 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 | |
229 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 | |
230 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 | |
231 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 | |
232 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 | |
233 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 | |
234 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 | |
235 | #define TRF7970A_ISO_CTRL_14443A_106 0x08 | |
236 | #define TRF7970A_ISO_CTRL_14443A_212 0x09 | |
237 | #define TRF7970A_ISO_CTRL_14443A_424 0x0a | |
238 | #define TRF7970A_ISO_CTRL_14443A_848 0x0b | |
239 | #define TRF7970A_ISO_CTRL_14443B_106 0x0c | |
240 | #define TRF7970A_ISO_CTRL_14443B_212 0x0d | |
241 | #define TRF7970A_ISO_CTRL_14443B_424 0x0e | |
242 | #define TRF7970A_ISO_CTRL_14443B_848 0x0f | |
243 | #define TRF7970A_ISO_CTRL_FELICA_212 0x1a | |
244 | #define TRF7970A_ISO_CTRL_FELICA_424 0x1b | |
13b4272a MG |
245 | #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 |
246 | #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 | |
247 | #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 | |
248 | #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 | |
249 | #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 | |
250 | #define TRF7970A_ISO_CTRL_NFC_CE BIT(2) | |
251 | #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) | |
252 | #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) | |
253 | #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) | |
165063f1 MG |
254 | #define TRF7970A_ISO_CTRL_RFID BIT(5) |
255 | #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) | |
256 | #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ | |
257 | ||
258 | #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f | |
259 | ||
260 | /* Modulator and SYS_CLK Control Register Bits */ | |
261 | #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) | |
262 | #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) | |
263 | #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) | |
264 | #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) | |
265 | #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) | |
266 | #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) | |
267 | #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) | |
268 | #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) | |
269 | #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) | |
270 | #define TRF7970A_MODULATOR_EN_ANA BIT(3) | |
271 | #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) | |
272 | #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) | |
273 | #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) | |
274 | #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) | |
275 | #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) | |
276 | #define TRF7970A_MODULATOR_EN_OOK BIT(6) | |
277 | #define TRF7970A_MODULATOR_27MHZ BIT(7) | |
278 | ||
13b4272a MG |
279 | #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) |
280 | #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) | |
281 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) | |
282 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) | |
283 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) | |
284 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) | |
285 | #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) | |
286 | #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) | |
287 | #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) | |
288 | #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) | |
289 | ||
290 | #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) | |
291 | #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) | |
292 | #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) | |
293 | #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) | |
294 | ||
165063f1 | 295 | /* IRQ Status Register Bits */ |
e2f0f671 | 296 | #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ |
13b4272a | 297 | #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) |
165063f1 MG |
298 | #define TRF7970A_IRQ_STATUS_COL BIT(1) |
299 | #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) | |
13b4272a | 300 | #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) |
165063f1 | 301 | #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) |
13b4272a | 302 | #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) |
165063f1 | 303 | #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) |
13b4272a | 304 | #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) |
165063f1 MG |
305 | #define TRF7970A_IRQ_STATUS_FIFO BIT(5) |
306 | #define TRF7970A_IRQ_STATUS_SRX BIT(6) | |
307 | #define TRF7970A_IRQ_STATUS_TX BIT(7) | |
308 | ||
309 | #define TRF7970A_IRQ_STATUS_ERROR \ | |
310 | (TRF7970A_IRQ_STATUS_COL | \ | |
311 | TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ | |
312 | TRF7970A_IRQ_STATUS_PARITY_ERROR | \ | |
313 | TRF7970A_IRQ_STATUS_CRC_ERROR) | |
314 | ||
851ee3cb MG |
315 | #define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0)) |
316 | #define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3)) | |
317 | #define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6) | |
318 | ||
165063f1 MG |
319 | #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) |
320 | #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) | |
321 | #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) | |
322 | #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) | |
323 | #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) | |
324 | #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) | |
325 | ||
326 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) | |
327 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) | |
328 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) | |
329 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) | |
330 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 | |
331 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 | |
332 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 | |
333 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 | |
334 | ||
13b4272a MG |
335 | #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) |
336 | #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) | |
337 | ||
338 | #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) | |
339 | #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) | |
ae291f79 | 340 | #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) |
13b4272a MG |
341 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) |
342 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) | |
343 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) | |
344 | ||
cb174aba MG |
345 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) |
346 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) | |
347 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) | |
348 | #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) | |
349 | #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) | |
350 | #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) | |
351 | #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) | |
352 | #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) | |
353 | ||
354 | #define TRF79070A_NFC_TARGET_PROTOCOL_106A \ | |
355 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
356 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
357 | TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ | |
358 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) | |
359 | ||
360 | #define TRF79070A_NFC_TARGET_PROTOCOL_106B \ | |
361 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
362 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
363 | TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ | |
364 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) | |
365 | ||
366 | #define TRF79070A_NFC_TARGET_PROTOCOL_212F \ | |
367 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
368 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
369 | TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ | |
370 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) | |
371 | ||
372 | #define TRF79070A_NFC_TARGET_PROTOCOL_424F \ | |
373 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
374 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
375 | TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ | |
376 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) | |
377 | ||
165063f1 MG |
378 | #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) |
379 | ||
380 | /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ | |
381 | #define NFC_T2T_CMD_READ 0x30 | |
382 | ||
9d9304b3 MG |
383 | /* ISO 15693 commands codes */ |
384 | #define ISO15693_CMD_INVENTORY 0x01 | |
385 | #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 | |
386 | #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 | |
387 | #define ISO15693_CMD_LOCK_BLOCK 0x22 | |
388 | #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 | |
389 | #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 | |
390 | #define ISO15693_CMD_SELECT 0x25 | |
391 | #define ISO15693_CMD_RESET_TO_READY 0x26 | |
392 | #define ISO15693_CMD_WRITE_AFI 0x27 | |
393 | #define ISO15693_CMD_LOCK_AFI 0x28 | |
394 | #define ISO15693_CMD_WRITE_DSFID 0x29 | |
395 | #define ISO15693_CMD_LOCK_DSFID 0x2a | |
396 | #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b | |
397 | #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c | |
398 | ||
399 | /* ISO 15693 request and response flags */ | |
400 | #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) | |
401 | #define ISO15693_REQ_FLAG_DATA_RATE BIT(1) | |
402 | #define ISO15693_REQ_FLAG_INVENTORY BIT(2) | |
403 | #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) | |
404 | #define ISO15693_REQ_FLAG_SELECT BIT(4) | |
405 | #define ISO15693_REQ_FLAG_AFI BIT(4) | |
406 | #define ISO15693_REQ_FLAG_ADDRESS BIT(5) | |
407 | #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) | |
408 | #define ISO15693_REQ_FLAG_OPTION BIT(6) | |
409 | ||
410 | #define ISO15693_REQ_FLAG_SPEED_MASK \ | |
411 | (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) | |
412 | ||
165063f1 | 413 | enum trf7970a_state { |
ceccd6aa | 414 | TRF7970A_ST_PWR_OFF, |
b5e17d9b | 415 | TRF7970A_ST_RF_OFF, |
165063f1 MG |
416 | TRF7970A_ST_IDLE, |
417 | TRF7970A_ST_IDLE_RX_BLOCKED, | |
418 | TRF7970A_ST_WAIT_FOR_TX_FIFO, | |
419 | TRF7970A_ST_WAIT_FOR_RX_DATA, | |
420 | TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, | |
9d9304b3 | 421 | TRF7970A_ST_WAIT_TO_ISSUE_EOF, |
13b4272a | 422 | TRF7970A_ST_LISTENING, |
cb174aba | 423 | TRF7970A_ST_LISTENING_MD, |
165063f1 MG |
424 | TRF7970A_ST_MAX |
425 | }; | |
426 | ||
427 | struct trf7970a { | |
428 | enum trf7970a_state state; | |
429 | struct device *dev; | |
430 | struct spi_device *spi; | |
431 | struct regulator *regulator; | |
432 | struct nfc_digital_dev *ddev; | |
433 | u32 quirks; | |
13b4272a | 434 | bool is_initiator; |
165063f1 MG |
435 | bool aborting; |
436 | struct sk_buff *tx_skb; | |
437 | struct sk_buff *rx_skb; | |
438 | nfc_digital_cmd_complete_t cb; | |
439 | void *cb_arg; | |
ebcc5a0d | 440 | u8 chip_status_ctrl; |
165063f1 | 441 | u8 iso_ctrl; |
49d19cc7 | 442 | u8 iso_ctrl_tech; |
12e9ade3 | 443 | u8 modulator_sys_clk_ctrl; |
165063f1 | 444 | u8 special_fcn_reg1; |
49d22c70 | 445 | u8 io_ctrl; |
4e64eff8 | 446 | unsigned int guard_time; |
165063f1 MG |
447 | int technology; |
448 | int framing; | |
cb174aba | 449 | u8 md_rf_tech; |
165063f1 | 450 | u8 tx_cmd; |
9d9304b3 | 451 | bool issue_eof; |
ab714817 | 452 | bool adjust_resp_len; |
d34e48d6 MG |
453 | struct gpio_desc *en_gpiod; |
454 | struct gpio_desc *en2_gpiod; | |
165063f1 MG |
455 | struct mutex lock; |
456 | unsigned int timeout; | |
457 | bool ignore_timeout; | |
458 | struct delayed_work timeout_work; | |
459 | }; | |
460 | ||
165063f1 MG |
461 | static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) |
462 | { | |
463 | u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); | |
464 | int ret; | |
465 | ||
466 | dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); | |
467 | ||
468 | ret = spi_write(trf->spi, &cmd, 1); | |
469 | if (ret) | |
470 | dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, | |
e2f0f671 | 471 | ret); |
165063f1 MG |
472 | return ret; |
473 | } | |
474 | ||
475 | static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) | |
476 | { | |
477 | u8 addr = TRF7970A_CMD_BIT_RW | reg; | |
478 | int ret; | |
479 | ||
480 | ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); | |
481 | if (ret) | |
482 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, | |
e2f0f671 | 483 | ret); |
165063f1 MG |
484 | |
485 | dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); | |
486 | ||
487 | return ret; | |
488 | } | |
489 | ||
e2f0f671 MG |
490 | static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, |
491 | size_t len) | |
165063f1 MG |
492 | { |
493 | u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; | |
3e7f3356 MG |
494 | struct spi_transfer t[2]; |
495 | struct spi_message m; | |
165063f1 MG |
496 | int ret; |
497 | ||
498 | dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); | |
499 | ||
3e7f3356 MG |
500 | spi_message_init(&m); |
501 | ||
502 | memset(&t, 0, sizeof(t)); | |
503 | ||
504 | t[0].tx_buf = &addr; | |
505 | t[0].len = sizeof(addr); | |
506 | spi_message_add_tail(&t[0], &m); | |
507 | ||
508 | t[1].rx_buf = buf; | |
509 | t[1].len = len; | |
510 | spi_message_add_tail(&t[1], &m); | |
511 | ||
512 | ret = spi_sync(trf->spi, &m); | |
165063f1 MG |
513 | if (ret) |
514 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, | |
e2f0f671 | 515 | ret); |
165063f1 MG |
516 | return ret; |
517 | } | |
518 | ||
519 | static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) | |
520 | { | |
521 | u8 buf[2] = { reg, val }; | |
522 | int ret; | |
523 | ||
524 | dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); | |
525 | ||
526 | ret = spi_write(trf->spi, buf, 2); | |
527 | if (ret) | |
528 | dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, | |
e2f0f671 | 529 | buf[0], buf[1], ret); |
165063f1 MG |
530 | |
531 | return ret; | |
532 | } | |
533 | ||
534 | static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) | |
535 | { | |
536 | int ret; | |
537 | u8 buf[2]; | |
538 | u8 addr; | |
539 | ||
540 | addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; | |
541 | ||
772079eb | 542 | if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { |
165063f1 MG |
543 | addr |= TRF7970A_CMD_BIT_CONTINUOUS; |
544 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); | |
545 | } else { | |
546 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); | |
547 | } | |
548 | ||
549 | if (ret) | |
550 | dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", | |
e2f0f671 | 551 | __func__, ret); |
165063f1 MG |
552 | else |
553 | *status = buf[0]; | |
554 | ||
555 | return ret; | |
556 | } | |
557 | ||
cb174aba MG |
558 | static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) |
559 | { | |
560 | int ret; | |
561 | u8 buf[2]; | |
562 | u8 addr; | |
563 | ||
564 | addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | | |
e2f0f671 | 565 | TRF7970A_CMD_BIT_CONTINUOUS; |
cb174aba MG |
566 | |
567 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); | |
568 | if (ret) | |
569 | dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", | |
e2f0f671 | 570 | __func__, ret); |
cb174aba MG |
571 | else |
572 | *target_proto = buf[0]; | |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
577 | static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) | |
578 | { | |
579 | int ret; | |
580 | u8 target_proto, tech; | |
581 | ||
582 | ret = trf7970a_read_target_proto(trf, &target_proto); | |
583 | if (ret) | |
584 | return ret; | |
585 | ||
586 | switch (target_proto) { | |
587 | case TRF79070A_NFC_TARGET_PROTOCOL_106A: | |
588 | tech = NFC_DIGITAL_RF_TECH_106A; | |
589 | break; | |
590 | case TRF79070A_NFC_TARGET_PROTOCOL_106B: | |
591 | tech = NFC_DIGITAL_RF_TECH_106B; | |
592 | break; | |
593 | case TRF79070A_NFC_TARGET_PROTOCOL_212F: | |
594 | tech = NFC_DIGITAL_RF_TECH_212F; | |
595 | break; | |
596 | case TRF79070A_NFC_TARGET_PROTOCOL_424F: | |
597 | tech = NFC_DIGITAL_RF_TECH_424F; | |
598 | break; | |
599 | default: | |
600 | dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", | |
e2f0f671 | 601 | __func__, target_proto); |
cb174aba MG |
602 | return -EIO; |
603 | } | |
604 | ||
605 | *rf_tech = tech; | |
606 | ||
607 | return ret; | |
608 | } | |
609 | ||
165063f1 MG |
610 | static void trf7970a_send_upstream(struct trf7970a *trf) |
611 | { | |
165063f1 MG |
612 | dev_kfree_skb_any(trf->tx_skb); |
613 | trf->tx_skb = NULL; | |
614 | ||
615 | if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) | |
616 | print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, | |
e2f0f671 MG |
617 | 16, 1, trf->rx_skb->data, trf->rx_skb->len, |
618 | false); | |
165063f1 | 619 | |
165063f1 MG |
620 | trf->state = TRF7970A_ST_IDLE; |
621 | ||
622 | if (trf->aborting) { | |
623 | dev_dbg(trf->dev, "Abort process complete\n"); | |
624 | ||
625 | if (!IS_ERR(trf->rx_skb)) { | |
626 | kfree_skb(trf->rx_skb); | |
627 | trf->rx_skb = ERR_PTR(-ECANCELED); | |
628 | } | |
629 | ||
630 | trf->aborting = false; | |
631 | } | |
632 | ||
ab714817 | 633 | if (trf->adjust_resp_len) { |
aaee24ac MG |
634 | if (trf->rx_skb) |
635 | skb_trim(trf->rx_skb, trf->rx_skb->len - 1); | |
636 | ||
ab714817 MG |
637 | trf->adjust_resp_len = false; |
638 | } | |
639 | ||
165063f1 MG |
640 | trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); |
641 | ||
642 | trf->rx_skb = NULL; | |
643 | } | |
644 | ||
645 | static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) | |
646 | { | |
647 | dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); | |
648 | ||
6fb9edcb MG |
649 | cancel_delayed_work(&trf->timeout_work); |
650 | ||
165063f1 MG |
651 | kfree_skb(trf->rx_skb); |
652 | trf->rx_skb = ERR_PTR(errno); | |
653 | ||
654 | trf7970a_send_upstream(trf); | |
655 | } | |
656 | ||
657 | static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, | |
e2f0f671 MG |
658 | unsigned int len, u8 *prefix, |
659 | unsigned int prefix_len) | |
165063f1 | 660 | { |
7a1e5552 MG |
661 | struct spi_transfer t[2]; |
662 | struct spi_message m; | |
165063f1 MG |
663 | unsigned int timeout; |
664 | int ret; | |
665 | ||
666 | print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, | |
e2f0f671 | 667 | 16, 1, skb->data, len, false); |
165063f1 | 668 | |
7a1e5552 MG |
669 | spi_message_init(&m); |
670 | ||
671 | memset(&t, 0, sizeof(t)); | |
672 | ||
673 | t[0].tx_buf = prefix; | |
674 | t[0].len = prefix_len; | |
675 | spi_message_add_tail(&t[0], &m); | |
676 | ||
677 | t[1].tx_buf = skb->data; | |
678 | t[1].len = len; | |
679 | spi_message_add_tail(&t[1], &m); | |
680 | ||
681 | ret = spi_sync(trf->spi, &m); | |
165063f1 MG |
682 | if (ret) { |
683 | dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, | |
e2f0f671 | 684 | ret); |
165063f1 MG |
685 | return ret; |
686 | } | |
687 | ||
688 | skb_pull(skb, len); | |
689 | ||
690 | if (skb->len > 0) { | |
691 | trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; | |
692 | timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; | |
693 | } else { | |
9d9304b3 MG |
694 | if (trf->issue_eof) { |
695 | trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; | |
696 | timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; | |
697 | } else { | |
698 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; | |
1961843c MG |
699 | |
700 | if (!trf->timeout) | |
701 | timeout = TRF7970A_WAIT_FOR_TX_IRQ; | |
702 | else | |
703 | timeout = trf->timeout; | |
9d9304b3 | 704 | } |
165063f1 MG |
705 | } |
706 | ||
707 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, | |
e2f0f671 | 708 | trf->state); |
165063f1 MG |
709 | |
710 | schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static void trf7970a_fill_fifo(struct trf7970a *trf) | |
716 | { | |
717 | struct sk_buff *skb = trf->tx_skb; | |
718 | unsigned int len; | |
719 | int ret; | |
720 | u8 fifo_bytes; | |
7a1e5552 | 721 | u8 prefix; |
165063f1 MG |
722 | |
723 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
724 | if (ret) { | |
725 | trf7970a_send_err_upstream(trf, ret); | |
726 | return; | |
727 | } | |
728 | ||
729 | dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); | |
730 | ||
4542e834 | 731 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
165063f1 MG |
732 | |
733 | /* Calculate how much more data can be written to the fifo */ | |
734 | len = TRF7970A_FIFO_SIZE - fifo_bytes; | |
0e840ed5 MG |
735 | if (!len) { |
736 | schedule_delayed_work(&trf->timeout_work, | |
737 | msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); | |
738 | return; | |
739 | } | |
740 | ||
165063f1 MG |
741 | len = min(skb->len, len); |
742 | ||
7a1e5552 MG |
743 | prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; |
744 | ||
745 | ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); | |
165063f1 MG |
746 | if (ret) |
747 | trf7970a_send_err_upstream(trf, ret); | |
748 | } | |
749 | ||
750 | static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) | |
751 | { | |
752 | struct sk_buff *skb = trf->rx_skb; | |
753 | int ret; | |
754 | u8 fifo_bytes; | |
755 | ||
756 | if (status & TRF7970A_IRQ_STATUS_ERROR) { | |
757 | trf7970a_send_err_upstream(trf, -EIO); | |
758 | return; | |
759 | } | |
760 | ||
761 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
762 | if (ret) { | |
763 | trf7970a_send_err_upstream(trf, ret); | |
764 | return; | |
765 | } | |
766 | ||
767 | dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); | |
768 | ||
4542e834 MG |
769 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
770 | ||
165063f1 MG |
771 | if (!fifo_bytes) |
772 | goto no_rx_data; | |
773 | ||
165063f1 MG |
774 | if (fifo_bytes > skb_tailroom(skb)) { |
775 | skb = skb_copy_expand(skb, skb_headroom(skb), | |
e2f0f671 MG |
776 | max_t(int, fifo_bytes, |
777 | TRF7970A_RX_SKB_ALLOC_SIZE), | |
778 | GFP_KERNEL); | |
165063f1 MG |
779 | if (!skb) { |
780 | trf7970a_send_err_upstream(trf, -ENOMEM); | |
781 | return; | |
782 | } | |
783 | ||
784 | kfree_skb(trf->rx_skb); | |
785 | trf->rx_skb = skb; | |
786 | } | |
787 | ||
788 | ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, | |
e2f0f671 | 789 | skb_put(skb, fifo_bytes), fifo_bytes); |
165063f1 MG |
790 | if (ret) { |
791 | trf7970a_send_err_upstream(trf, ret); | |
792 | return; | |
793 | } | |
794 | ||
795 | /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ | |
796 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && | |
e2f0f671 | 797 | (trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { |
165063f1 MG |
798 | skb->data[0] >>= 4; |
799 | status = TRF7970A_IRQ_STATUS_SRX; | |
800 | } else { | |
801 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; | |
5d8f7594 MG |
802 | |
803 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
804 | if (ret) { | |
805 | trf7970a_send_err_upstream(trf, ret); | |
806 | return; | |
807 | } | |
808 | ||
809 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; | |
810 | ||
811 | /* If there are bytes in the FIFO, set status to '0' so | |
812 | * the if stmt below doesn't fire and the driver will wait | |
813 | * for the trf7970a to generate another RX interrupt. | |
814 | */ | |
815 | if (fifo_bytes) | |
816 | status = 0; | |
165063f1 MG |
817 | } |
818 | ||
819 | no_rx_data: | |
e2f0f671 | 820 | if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ |
165063f1 MG |
821 | trf7970a_send_upstream(trf); |
822 | return; | |
823 | } | |
824 | ||
825 | dev_dbg(trf->dev, "Setting timeout for %d ms\n", | |
e2f0f671 | 826 | TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); |
165063f1 MG |
827 | |
828 | schedule_delayed_work(&trf->timeout_work, | |
e2f0f671 | 829 | msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); |
165063f1 MG |
830 | } |
831 | ||
832 | static irqreturn_t trf7970a_irq(int irq, void *dev_id) | |
833 | { | |
834 | struct trf7970a *trf = dev_id; | |
835 | int ret; | |
13b4272a | 836 | u8 status, fifo_bytes, iso_ctrl; |
165063f1 MG |
837 | |
838 | mutex_lock(&trf->lock); | |
839 | ||
b5e17d9b | 840 | if (trf->state == TRF7970A_ST_RF_OFF) { |
165063f1 MG |
841 | mutex_unlock(&trf->lock); |
842 | return IRQ_NONE; | |
843 | } | |
844 | ||
845 | ret = trf7970a_read_irqstatus(trf, &status); | |
846 | if (ret) { | |
847 | mutex_unlock(&trf->lock); | |
848 | return IRQ_NONE; | |
849 | } | |
850 | ||
851 | dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, | |
e2f0f671 | 852 | status); |
165063f1 MG |
853 | |
854 | if (!status) { | |
855 | mutex_unlock(&trf->lock); | |
856 | return IRQ_NONE; | |
857 | } | |
858 | ||
859 | switch (trf->state) { | |
860 | case TRF7970A_ST_IDLE: | |
861 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
13b4272a MG |
862 | /* If initiator and getting interrupts caused by RF noise, |
863 | * turn off the receiver to avoid unnecessary interrupts. | |
864 | * It will be turned back on in trf7970a_send_cmd() when | |
865 | * the next command is issued. | |
165063f1 | 866 | */ |
13b4272a | 867 | if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { |
165063f1 MG |
868 | trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); |
869 | trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; | |
870 | } | |
871 | ||
872 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
873 | break; | |
874 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
875 | if (status & TRF7970A_IRQ_STATUS_TX) { | |
876 | trf->ignore_timeout = | |
e2f0f671 | 877 | !cancel_delayed_work(&trf->timeout_work); |
165063f1 MG |
878 | trf7970a_fill_fifo(trf); |
879 | } else { | |
880 | trf7970a_send_err_upstream(trf, -EIO); | |
881 | } | |
882 | break; | |
883 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
884 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
885 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
886 | trf->ignore_timeout = | |
e2f0f671 | 887 | !cancel_delayed_work(&trf->timeout_work); |
165063f1 | 888 | trf7970a_drain_fifo(trf, status); |
bece3c54 MG |
889 | } else if (status & TRF7970A_IRQ_STATUS_FIFO) { |
890 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, | |
e2f0f671 | 891 | &fifo_bytes); |
bece3c54 MG |
892 | |
893 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; | |
894 | ||
895 | if (ret) | |
896 | trf7970a_send_err_upstream(trf, ret); | |
897 | else if (!fifo_bytes) | |
898 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
13b4272a | 899 | } else if ((status == TRF7970A_IRQ_STATUS_TX) || |
e2f0f671 MG |
900 | (!trf->is_initiator && |
901 | (status == (TRF7970A_IRQ_STATUS_TX | | |
902 | TRF7970A_IRQ_STATUS_NFC_RF)))) { | |
4dd836e4 | 903 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
1961843c MG |
904 | |
905 | if (!trf->timeout) { | |
e2f0f671 MG |
906 | trf->ignore_timeout = |
907 | !cancel_delayed_work(&trf->timeout_work); | |
1961843c MG |
908 | trf->rx_skb = ERR_PTR(0); |
909 | trf7970a_send_upstream(trf); | |
910 | break; | |
911 | } | |
13b4272a MG |
912 | |
913 | if (trf->is_initiator) | |
914 | break; | |
915 | ||
916 | iso_ctrl = trf->iso_ctrl; | |
917 | ||
918 | switch (trf->framing) { | |
919 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
920 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
921 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; | |
922 | trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ | |
923 | break; | |
924 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
925 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
926 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; | |
927 | trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ | |
928 | break; | |
929 | case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: | |
930 | ret = trf7970a_write(trf, | |
e2f0f671 MG |
931 | TRF7970A_SPECIAL_FCN_REG1, |
932 | TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); | |
13b4272a | 933 | if (ret) |
b9e3016a | 934 | goto err_unlock_exit; |
13b4272a MG |
935 | |
936 | trf->special_fcn_reg1 = | |
e2f0f671 | 937 | TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; |
13b4272a MG |
938 | break; |
939 | default: | |
940 | break; | |
941 | } | |
942 | ||
943 | if (iso_ctrl != trf->iso_ctrl) { | |
944 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, | |
e2f0f671 | 945 | iso_ctrl); |
13b4272a | 946 | if (ret) |
b9e3016a | 947 | goto err_unlock_exit; |
13b4272a MG |
948 | |
949 | trf->iso_ctrl = iso_ctrl; | |
950 | } | |
4dd836e4 | 951 | } else { |
165063f1 MG |
952 | trf7970a_send_err_upstream(trf, -EIO); |
953 | } | |
954 | break; | |
9d9304b3 MG |
955 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
956 | if (status != TRF7970A_IRQ_STATUS_TX) | |
957 | trf7970a_send_err_upstream(trf, -EIO); | |
958 | break; | |
13b4272a MG |
959 | case TRF7970A_ST_LISTENING: |
960 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
961 | trf->ignore_timeout = | |
e2f0f671 | 962 | !cancel_delayed_work(&trf->timeout_work); |
13b4272a MG |
963 | trf7970a_drain_fifo(trf, status); |
964 | } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { | |
965 | trf7970a_send_err_upstream(trf, -EIO); | |
966 | } | |
967 | break; | |
cb174aba MG |
968 | case TRF7970A_ST_LISTENING_MD: |
969 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
970 | trf->ignore_timeout = | |
e2f0f671 | 971 | !cancel_delayed_work(&trf->timeout_work); |
cb174aba MG |
972 | |
973 | ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); | |
974 | if (ret) { | |
975 | trf7970a_send_err_upstream(trf, ret); | |
976 | } else { | |
977 | trf->state = TRF7970A_ST_LISTENING; | |
978 | trf7970a_drain_fifo(trf, status); | |
979 | } | |
980 | } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { | |
981 | trf7970a_send_err_upstream(trf, -EIO); | |
982 | } | |
983 | break; | |
165063f1 MG |
984 | default: |
985 | dev_err(trf->dev, "%s - Driver in invalid state: %d\n", | |
e2f0f671 | 986 | __func__, trf->state); |
165063f1 MG |
987 | } |
988 | ||
b9e3016a | 989 | err_unlock_exit: |
165063f1 MG |
990 | mutex_unlock(&trf->lock); |
991 | return IRQ_HANDLED; | |
992 | } | |
993 | ||
9d9304b3 MG |
994 | static void trf7970a_issue_eof(struct trf7970a *trf) |
995 | { | |
996 | int ret; | |
997 | ||
998 | dev_dbg(trf->dev, "Issuing EOF\n"); | |
999 | ||
1000 | ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
1001 | if (ret) | |
1002 | trf7970a_send_err_upstream(trf, ret); | |
1003 | ||
1004 | ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); | |
1005 | if (ret) | |
1006 | trf7970a_send_err_upstream(trf, ret); | |
1007 | ||
1008 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; | |
1009 | ||
1010 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", | |
e2f0f671 | 1011 | trf->timeout, trf->state); |
9d9304b3 MG |
1012 | |
1013 | schedule_delayed_work(&trf->timeout_work, | |
e2f0f671 | 1014 | msecs_to_jiffies(trf->timeout)); |
9d9304b3 MG |
1015 | } |
1016 | ||
165063f1 MG |
1017 | static void trf7970a_timeout_work_handler(struct work_struct *work) |
1018 | { | |
1019 | struct trf7970a *trf = container_of(work, struct trf7970a, | |
e2f0f671 | 1020 | timeout_work.work); |
165063f1 MG |
1021 | |
1022 | dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", | |
e2f0f671 | 1023 | trf->state, trf->ignore_timeout); |
165063f1 MG |
1024 | |
1025 | mutex_lock(&trf->lock); | |
1026 | ||
1027 | if (trf->ignore_timeout) | |
1028 | trf->ignore_timeout = false; | |
1029 | else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) | |
afa5b5f1 | 1030 | trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); |
9d9304b3 MG |
1031 | else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) |
1032 | trf7970a_issue_eof(trf); | |
165063f1 MG |
1033 | else |
1034 | trf7970a_send_err_upstream(trf, -ETIMEDOUT); | |
1035 | ||
1036 | mutex_unlock(&trf->lock); | |
1037 | } | |
1038 | ||
1039 | static int trf7970a_init(struct trf7970a *trf) | |
1040 | { | |
1041 | int ret; | |
1042 | ||
1043 | dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); | |
1044 | ||
1045 | ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); | |
1046 | if (ret) | |
1047 | goto err_out; | |
1048 | ||
1049 | ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); | |
1050 | if (ret) | |
1051 | goto err_out; | |
1052 | ||
49d22c70 | 1053 | ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, |
e2f0f671 | 1054 | trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
49d22c70 GL |
1055 | if (ret) |
1056 | goto err_out; | |
1057 | ||
58d46f53 GL |
1058 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); |
1059 | if (ret) | |
1060 | goto err_out; | |
1061 | ||
4e007f81 MG |
1062 | usleep_range(1000, 2000); |
1063 | ||
7149d6bf MG |
1064 | trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
1065 | ||
837eb4d2 | 1066 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
e2f0f671 | 1067 | trf->modulator_sys_clk_ctrl); |
6c08df42 MG |
1068 | if (ret) |
1069 | goto err_out; | |
1070 | ||
165063f1 | 1071 | ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, |
e2f0f671 MG |
1072 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | |
1073 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); | |
165063f1 MG |
1074 | if (ret) |
1075 | goto err_out; | |
1076 | ||
1077 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); | |
1078 | if (ret) | |
1079 | goto err_out; | |
1080 | ||
1081 | trf->special_fcn_reg1 = 0; | |
1082 | ||
49d19cc7 | 1083 | trf->iso_ctrl = 0xff; |
165063f1 MG |
1084 | return 0; |
1085 | ||
1086 | err_out: | |
1087 | dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); | |
1088 | return ret; | |
1089 | } | |
1090 | ||
1091 | static void trf7970a_switch_rf_off(struct trf7970a *trf) | |
1092 | { | |
cfc708db | 1093 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
e2f0f671 | 1094 | (trf->state == TRF7970A_ST_RF_OFF)) |
cfc708db MG |
1095 | return; |
1096 | ||
165063f1 MG |
1097 | dev_dbg(trf->dev, "Switching rf off\n"); |
1098 | ||
a1d2dc5b MG |
1099 | trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
1100 | ||
1101 | trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); | |
1102 | ||
165063f1 | 1103 | trf->aborting = false; |
b5e17d9b | 1104 | trf->state = TRF7970A_ST_RF_OFF; |
e6403b7c MG |
1105 | |
1106 | pm_runtime_mark_last_busy(trf->dev); | |
1107 | pm_runtime_put_autosuspend(trf->dev); | |
165063f1 MG |
1108 | } |
1109 | ||
0a1de842 | 1110 | static int trf7970a_switch_rf_on(struct trf7970a *trf) |
165063f1 | 1111 | { |
a08e5454 MG |
1112 | int ret; |
1113 | ||
165063f1 MG |
1114 | dev_dbg(trf->dev, "Switching rf on\n"); |
1115 | ||
e6403b7c | 1116 | pm_runtime_get_sync(trf->dev); |
165063f1 | 1117 | |
e2f0f671 | 1118 | if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ |
ceccd6aa | 1119 | dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, |
e2f0f671 | 1120 | trf->state); |
ceccd6aa MG |
1121 | return -EINVAL; |
1122 | } | |
1123 | ||
a08e5454 MG |
1124 | ret = trf7970a_init(trf); |
1125 | if (ret) { | |
1126 | dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); | |
0a1de842 | 1127 | return ret; |
a08e5454 MG |
1128 | } |
1129 | ||
e6403b7c | 1130 | trf->state = TRF7970A_ST_IDLE; |
0a1de842 MG |
1131 | |
1132 | return 0; | |
165063f1 MG |
1133 | } |
1134 | ||
1135 | static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) | |
1136 | { | |
1137 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
0a1de842 | 1138 | int ret = 0; |
165063f1 MG |
1139 | |
1140 | dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); | |
1141 | ||
1142 | mutex_lock(&trf->lock); | |
1143 | ||
1144 | if (on) { | |
1145 | switch (trf->state) { | |
ceccd6aa | 1146 | case TRF7970A_ST_PWR_OFF: |
b5e17d9b | 1147 | case TRF7970A_ST_RF_OFF: |
0a1de842 | 1148 | ret = trf7970a_switch_rf_on(trf); |
165063f1 MG |
1149 | break; |
1150 | case TRF7970A_ST_IDLE: | |
1151 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
1152 | break; | |
1153 | default: | |
1154 | dev_err(trf->dev, "%s - Invalid request: %d %d\n", | |
e2f0f671 | 1155 | __func__, trf->state, on); |
165063f1 | 1156 | trf7970a_switch_rf_off(trf); |
0a1de842 | 1157 | ret = -EINVAL; |
165063f1 MG |
1158 | } |
1159 | } else { | |
1160 | switch (trf->state) { | |
ceccd6aa | 1161 | case TRF7970A_ST_PWR_OFF: |
b5e17d9b | 1162 | case TRF7970A_ST_RF_OFF: |
165063f1 MG |
1163 | break; |
1164 | default: | |
1165 | dev_err(trf->dev, "%s - Invalid request: %d %d\n", | |
e2f0f671 | 1166 | __func__, trf->state, on); |
0a1de842 | 1167 | ret = -EINVAL; |
165063f1 MG |
1168 | /* FALLTHROUGH */ |
1169 | case TRF7970A_ST_IDLE: | |
1170 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
13b4272a MG |
1171 | case TRF7970A_ST_WAIT_FOR_RX_DATA: |
1172 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
165063f1 MG |
1173 | trf7970a_switch_rf_off(trf); |
1174 | } | |
1175 | } | |
1176 | ||
1177 | mutex_unlock(&trf->lock); | |
0a1de842 | 1178 | return ret; |
165063f1 MG |
1179 | } |
1180 | ||
307e5caf | 1181 | static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) |
165063f1 MG |
1182 | { |
1183 | int ret = 0; | |
1184 | ||
1185 | dev_dbg(trf->dev, "rf technology: %d\n", tech); | |
1186 | ||
1187 | switch (tech) { | |
1188 | case NFC_DIGITAL_RF_TECH_106A: | |
49d19cc7 | 1189 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; |
837eb4d2 | 1190 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1191 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1192 | TRF7970A_MODULATOR_DEPTH_OOK; | |
4e64eff8 | 1193 | trf->guard_time = TRF7970A_GUARD_TIME_NFCA; |
165063f1 | 1194 | break; |
742b1f9f MG |
1195 | case NFC_DIGITAL_RF_TECH_106B: |
1196 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; | |
837eb4d2 | 1197 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1198 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1199 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
4e64eff8 | 1200 | trf->guard_time = TRF7970A_GUARD_TIME_NFCB; |
742b1f9f | 1201 | break; |
6857bb96 MG |
1202 | case NFC_DIGITAL_RF_TECH_212F: |
1203 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; | |
837eb4d2 | 1204 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1205 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1206 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
4e64eff8 | 1207 | trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
6857bb96 MG |
1208 | break; |
1209 | case NFC_DIGITAL_RF_TECH_424F: | |
1210 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; | |
837eb4d2 | 1211 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1212 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1213 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
4e64eff8 | 1214 | trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
6857bb96 | 1215 | break; |
9d9304b3 | 1216 | case NFC_DIGITAL_RF_TECH_ISO15693: |
49d19cc7 | 1217 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; |
837eb4d2 | 1218 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1219 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1220 | TRF7970A_MODULATOR_DEPTH_OOK; | |
4e64eff8 | 1221 | trf->guard_time = TRF7970A_GUARD_TIME_15693; |
9d9304b3 | 1222 | break; |
165063f1 MG |
1223 | default: |
1224 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | ||
1228 | trf->technology = tech; | |
1229 | ||
13b4272a MG |
1230 | /* If in initiator mode and not changing the RF tech due to a |
1231 | * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from | |
1232 | * trf7970a_init()), clear the NFC Target Detection Level register | |
1233 | * due to erratum. | |
1234 | */ | |
1235 | if (trf->iso_ctrl == 0xff) | |
1236 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); | |
1237 | ||
165063f1 MG |
1238 | return ret; |
1239 | } | |
1240 | ||
851ee3cb MG |
1241 | static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) |
1242 | { | |
1243 | int ret; | |
1244 | u8 rssi; | |
1245 | ||
1246 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
e2f0f671 MG |
1247 | trf->chip_status_ctrl | |
1248 | TRF7970A_CHIP_STATUS_REC_ON); | |
851ee3cb MG |
1249 | if (ret) |
1250 | return ret; | |
1251 | ||
1252 | ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); | |
1253 | if (ret) | |
1254 | return ret; | |
1255 | ||
1256 | usleep_range(50, 60); | |
1257 | ||
1258 | ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); | |
1259 | if (ret) | |
1260 | return ret; | |
1261 | ||
1262 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
e2f0f671 | 1263 | trf->chip_status_ctrl); |
851ee3cb MG |
1264 | if (ret) |
1265 | return ret; | |
1266 | ||
1267 | if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) | |
1268 | *is_rf_field = true; | |
1269 | else | |
1270 | *is_rf_field = false; | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
307e5caf | 1275 | static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) |
165063f1 | 1276 | { |
49d19cc7 | 1277 | u8 iso_ctrl = trf->iso_ctrl_tech; |
851ee3cb | 1278 | bool is_rf_field = false; |
49d19cc7 MG |
1279 | int ret; |
1280 | ||
165063f1 MG |
1281 | dev_dbg(trf->dev, "framing: %d\n", framing); |
1282 | ||
1283 | switch (framing) { | |
1284 | case NFC_DIGITAL_FRAMING_NFCA_SHORT: | |
1285 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
1286 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
49d19cc7 | 1287 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
1288 | break; |
1289 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
80062891 | 1290 | case NFC_DIGITAL_FRAMING_NFCA_T4T: |
742b1f9f MG |
1291 | case NFC_DIGITAL_FRAMING_NFCB: |
1292 | case NFC_DIGITAL_FRAMING_NFCB_T4T: | |
6857bb96 MG |
1293 | case NFC_DIGITAL_FRAMING_NFCF: |
1294 | case NFC_DIGITAL_FRAMING_NFCF_T3T: | |
9d9304b3 MG |
1295 | case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: |
1296 | case NFC_DIGITAL_FRAMING_ISO15693_T5T: | |
13b4272a MG |
1297 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: |
1298 | case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: | |
165063f1 | 1299 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
49d19cc7 | 1300 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
1301 | break; |
1302 | case NFC_DIGITAL_FRAMING_NFCA_T2T: | |
1303 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
49d19cc7 | 1304 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
1305 | break; |
1306 | default: | |
1307 | dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); | |
1308 | return -EINVAL; | |
1309 | } | |
1310 | ||
1311 | trf->framing = framing; | |
1312 | ||
851ee3cb MG |
1313 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1314 | ret = trf7970a_is_rf_field(trf, &is_rf_field); | |
1315 | if (ret) | |
1316 | return ret; | |
1317 | ||
1318 | if (is_rf_field) | |
1319 | return -EBUSY; | |
1320 | } | |
1321 | ||
49d19cc7 MG |
1322 | if (iso_ctrl != trf->iso_ctrl) { |
1323 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1324 | if (ret) | |
1325 | return ret; | |
1326 | ||
1327 | trf->iso_ctrl = iso_ctrl; | |
a0822a7e MG |
1328 | |
1329 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, | |
e2f0f671 | 1330 | trf->modulator_sys_clk_ctrl); |
a0822a7e MG |
1331 | if (ret) |
1332 | return ret; | |
49d19cc7 MG |
1333 | } |
1334 | ||
a1d2dc5b MG |
1335 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1336 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
e2f0f671 MG |
1337 | trf->chip_status_ctrl | |
1338 | TRF7970A_CHIP_STATUS_RF_ON); | |
a1d2dc5b MG |
1339 | if (ret) |
1340 | return ret; | |
1341 | ||
1342 | trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; | |
1343 | ||
4e64eff8 | 1344 | usleep_range(trf->guard_time, trf->guard_time + 1000); |
a1d2dc5b MG |
1345 | } |
1346 | ||
49d19cc7 | 1347 | return 0; |
165063f1 MG |
1348 | } |
1349 | ||
1350 | static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, | |
e2f0f671 | 1351 | int param) |
165063f1 MG |
1352 | { |
1353 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
18422e68 | 1354 | int ret; |
165063f1 MG |
1355 | |
1356 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); | |
1357 | ||
1358 | mutex_lock(&trf->lock); | |
1359 | ||
13b4272a MG |
1360 | trf->is_initiator = true; |
1361 | ||
ceccd6aa | 1362 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
e2f0f671 | 1363 | (trf->state == TRF7970A_ST_RF_OFF)) { |
0a1de842 MG |
1364 | ret = trf7970a_switch_rf_on(trf); |
1365 | if (ret) | |
1366 | goto err_unlock; | |
1367 | } | |
165063f1 MG |
1368 | |
1369 | switch (type) { | |
1370 | case NFC_DIGITAL_CONFIG_RF_TECH: | |
307e5caf | 1371 | ret = trf7970a_in_config_rf_tech(trf, param); |
165063f1 MG |
1372 | break; |
1373 | case NFC_DIGITAL_CONFIG_FRAMING: | |
307e5caf | 1374 | ret = trf7970a_in_config_framing(trf, param); |
165063f1 MG |
1375 | break; |
1376 | default: | |
1377 | dev_dbg(trf->dev, "Unknown type: %d\n", type); | |
1378 | ret = -EINVAL; | |
1379 | } | |
1380 | ||
0a1de842 | 1381 | err_unlock: |
165063f1 MG |
1382 | mutex_unlock(&trf->lock); |
1383 | return ret; | |
1384 | } | |
1385 | ||
9d9304b3 MG |
1386 | static int trf7970a_is_iso15693_write_or_lock(u8 cmd) |
1387 | { | |
1388 | switch (cmd) { | |
1389 | case ISO15693_CMD_WRITE_SINGLE_BLOCK: | |
1390 | case ISO15693_CMD_LOCK_BLOCK: | |
1391 | case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: | |
1392 | case ISO15693_CMD_WRITE_AFI: | |
1393 | case ISO15693_CMD_LOCK_AFI: | |
1394 | case ISO15693_CMD_WRITE_DSFID: | |
1395 | case ISO15693_CMD_LOCK_DSFID: | |
1396 | return 1; | |
1397 | break; | |
1398 | default: | |
1399 | return 0; | |
1400 | } | |
1401 | } | |
1402 | ||
165063f1 MG |
1403 | static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) |
1404 | { | |
1405 | u8 *req = skb->data; | |
9d9304b3 | 1406 | u8 special_fcn_reg1, iso_ctrl; |
165063f1 MG |
1407 | int ret; |
1408 | ||
9d9304b3 MG |
1409 | trf->issue_eof = false; |
1410 | ||
165063f1 MG |
1411 | /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in |
1412 | * special functions register 1 is cleared; otherwise, its a write or | |
1413 | * sector select command and '4_bit_RX' must be set. | |
9d9304b3 MG |
1414 | * |
1415 | * When issuing an ISO 15693 command, inspect the flags byte to see | |
1416 | * what speed to use. Also, remember if the OPTION flag is set on | |
1417 | * a Type 5 write or lock command so the driver will know that it | |
1418 | * has to send an EOF in order to get a response. | |
165063f1 MG |
1419 | */ |
1420 | if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && | |
e2f0f671 | 1421 | (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { |
165063f1 MG |
1422 | if (req[0] == NFC_T2T_CMD_READ) |
1423 | special_fcn_reg1 = 0; | |
1424 | else | |
1425 | special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; | |
1426 | ||
1427 | if (special_fcn_reg1 != trf->special_fcn_reg1) { | |
1428 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, | |
e2f0f671 | 1429 | special_fcn_reg1); |
165063f1 MG |
1430 | if (ret) |
1431 | return ret; | |
1432 | ||
1433 | trf->special_fcn_reg1 = special_fcn_reg1; | |
1434 | } | |
9d9304b3 MG |
1435 | } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { |
1436 | iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; | |
1437 | ||
1438 | switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { | |
1439 | case 0x00: | |
1440 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; | |
1441 | break; | |
1442 | case ISO15693_REQ_FLAG_SUB_CARRIER: | |
1443 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; | |
1444 | break; | |
1445 | case ISO15693_REQ_FLAG_DATA_RATE: | |
1446 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; | |
1447 | break; | |
1448 | case (ISO15693_REQ_FLAG_SUB_CARRIER | | |
e2f0f671 | 1449 | ISO15693_REQ_FLAG_DATA_RATE): |
9d9304b3 MG |
1450 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; |
1451 | break; | |
1452 | } | |
1453 | ||
1454 | if (iso_ctrl != trf->iso_ctrl) { | |
1455 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1456 | if (ret) | |
1457 | return ret; | |
1458 | ||
1459 | trf->iso_ctrl = iso_ctrl; | |
1460 | } | |
1461 | ||
ab714817 MG |
1462 | if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) { |
1463 | if (trf7970a_is_iso15693_write_or_lock(req[1]) && | |
e2f0f671 | 1464 | (req[0] & ISO15693_REQ_FLAG_OPTION)) |
ab714817 MG |
1465 | trf->issue_eof = true; |
1466 | else if ((trf->quirks & | |
e2f0f671 | 1467 | TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) && |
ab714817 MG |
1468 | (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK)) |
1469 | trf->adjust_resp_len = true; | |
1470 | } | |
165063f1 MG |
1471 | } |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
13b4272a | 1476 | static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, |
e2f0f671 MG |
1477 | struct sk_buff *skb, u16 timeout, |
1478 | nfc_digital_cmd_complete_t cb, void *arg) | |
165063f1 MG |
1479 | { |
1480 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
7a1e5552 | 1481 | u8 prefix[5]; |
165063f1 MG |
1482 | unsigned int len; |
1483 | int ret; | |
aff0564a | 1484 | u8 status; |
165063f1 MG |
1485 | |
1486 | dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", | |
e2f0f671 | 1487 | trf->state, timeout, skb->len); |
165063f1 MG |
1488 | |
1489 | if (skb->len > TRF7970A_TX_MAX) | |
1490 | return -EINVAL; | |
1491 | ||
1492 | mutex_lock(&trf->lock); | |
1493 | ||
1494 | if ((trf->state != TRF7970A_ST_IDLE) && | |
e2f0f671 | 1495 | (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { |
165063f1 | 1496 | dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, |
e2f0f671 | 1497 | trf->state); |
165063f1 MG |
1498 | ret = -EIO; |
1499 | goto out_err; | |
1500 | } | |
1501 | ||
1502 | if (trf->aborting) { | |
1503 | dev_dbg(trf->dev, "Abort process complete\n"); | |
1504 | trf->aborting = false; | |
1505 | ret = -ECANCELED; | |
1506 | goto out_err; | |
1507 | } | |
1508 | ||
1961843c MG |
1509 | if (timeout) { |
1510 | trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, | |
e2f0f671 | 1511 | GFP_KERNEL); |
1961843c MG |
1512 | if (!trf->rx_skb) { |
1513 | dev_dbg(trf->dev, "Can't alloc rx_skb\n"); | |
1514 | ret = -ENOMEM; | |
1515 | goto out_err; | |
1516 | } | |
165063f1 MG |
1517 | } |
1518 | ||
1519 | if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { | |
1520 | ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); | |
1521 | if (ret) | |
1522 | goto out_err; | |
1523 | ||
1524 | trf->state = TRF7970A_ST_IDLE; | |
1525 | } | |
1526 | ||
13b4272a MG |
1527 | if (trf->is_initiator) { |
1528 | ret = trf7970a_per_cmd_config(trf, skb); | |
1529 | if (ret) | |
1530 | goto out_err; | |
1531 | } | |
165063f1 MG |
1532 | |
1533 | trf->ddev = ddev; | |
1534 | trf->tx_skb = skb; | |
1535 | trf->cb = cb; | |
1536 | trf->cb_arg = arg; | |
1537 | trf->timeout = timeout; | |
1538 | trf->ignore_timeout = false; | |
1539 | ||
1540 | len = skb->len; | |
165063f1 MG |
1541 | |
1542 | /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends | |
1543 | * on what the current framing is, the address of the TX length byte 1 | |
1544 | * register (0x1d), and the 2 byte length of the data to be transmitted. | |
7a1e5552 | 1545 | * That totals 5 bytes. |
165063f1 MG |
1546 | */ |
1547 | prefix[0] = TRF7970A_CMD_BIT_CTRL | | |
e2f0f671 | 1548 | TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); |
165063f1 | 1549 | prefix[1] = TRF7970A_CMD_BIT_CTRL | |
e2f0f671 | 1550 | TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); |
165063f1 MG |
1551 | prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; |
1552 | ||
1553 | if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { | |
1554 | prefix[3] = 0x00; | |
e2f0f671 | 1555 | prefix[4] = 0x0f; /* 7 bits */ |
165063f1 MG |
1556 | } else { |
1557 | prefix[3] = (len & 0xf00) >> 4; | |
1558 | prefix[3] |= ((len & 0xf0) >> 4); | |
1559 | prefix[4] = ((len & 0x0f) << 4); | |
1560 | } | |
1561 | ||
1562 | len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); | |
1563 | ||
aff0564a MG |
1564 | /* Clear possible spurious interrupt */ |
1565 | ret = trf7970a_read_irqstatus(trf, &status); | |
1566 | if (ret) | |
1567 | goto out_err; | |
1568 | ||
7a1e5552 | 1569 | ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); |
165063f1 MG |
1570 | if (ret) { |
1571 | kfree_skb(trf->rx_skb); | |
1572 | trf->rx_skb = NULL; | |
1573 | } | |
1574 | ||
1575 | out_err: | |
1576 | mutex_unlock(&trf->lock); | |
1577 | return ret; | |
1578 | } | |
1579 | ||
13b4272a | 1580 | static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) |
165063f1 | 1581 | { |
13b4272a MG |
1582 | int ret = 0; |
1583 | ||
1584 | dev_dbg(trf->dev, "rf technology: %d\n", tech); | |
1585 | ||
1586 | switch (tech) { | |
1587 | case NFC_DIGITAL_RF_TECH_106A: | |
1588 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | | |
e2f0f671 | 1589 | TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A; |
837eb4d2 | 1590 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1591 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1592 | TRF7970A_MODULATOR_DEPTH_OOK; | |
13b4272a MG |
1593 | break; |
1594 | case NFC_DIGITAL_RF_TECH_212F: | |
1595 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | | |
e2f0f671 | 1596 | TRF7970A_ISO_CTRL_NFC_NFCF_212; |
837eb4d2 | 1597 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1598 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1599 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
13b4272a MG |
1600 | break; |
1601 | case NFC_DIGITAL_RF_TECH_424F: | |
1602 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | | |
e2f0f671 | 1603 | TRF7970A_ISO_CTRL_NFC_NFCF_424; |
837eb4d2 | 1604 | trf->modulator_sys_clk_ctrl = |
e2f0f671 MG |
1605 | (trf->modulator_sys_clk_ctrl & 0xf8) | |
1606 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
13b4272a MG |
1607 | break; |
1608 | default: | |
1609 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); | |
1610 | return -EINVAL; | |
1611 | } | |
1612 | ||
1613 | trf->technology = tech; | |
165063f1 | 1614 | |
13b4272a MG |
1615 | /* Normally we write the ISO_CTRL register in |
1616 | * trf7970a_tg_config_framing() because the framing can change | |
1617 | * the value written. However, when sending a PSL RES, | |
1618 | * digital_tg_send_psl_res_complete() doesn't call | |
1619 | * trf7970a_tg_config_framing() so we must write the register | |
1620 | * here. | |
1621 | */ | |
1622 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && | |
e2f0f671 | 1623 | (trf->iso_ctrl_tech != trf->iso_ctrl)) { |
13b4272a | 1624 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, |
e2f0f671 | 1625 | trf->iso_ctrl_tech); |
13b4272a MG |
1626 | |
1627 | trf->iso_ctrl = trf->iso_ctrl_tech; | |
1628 | } | |
165063f1 | 1629 | |
13b4272a | 1630 | return ret; |
165063f1 MG |
1631 | } |
1632 | ||
13b4272a MG |
1633 | /* Since this is a target routine, several of the framing calls are |
1634 | * made between receiving the request and sending the response so they | |
1635 | * should take effect until after the response is sent. This is accomplished | |
1636 | * by skipping the ISO_CTRL register write here and doing it in the interrupt | |
1637 | * handler. | |
1638 | */ | |
1639 | static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) | |
1640 | { | |
1641 | u8 iso_ctrl = trf->iso_ctrl_tech; | |
1642 | int ret; | |
1643 | ||
1644 | dev_dbg(trf->dev, "framing: %d\n", framing); | |
1645 | ||
1646 | switch (framing) { | |
1647 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: | |
1648 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
1649 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; | |
1650 | break; | |
1651 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
1652 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
1653 | case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: | |
1654 | /* These ones are applied in the interrupt handler */ | |
1655 | iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ | |
1656 | break; | |
1657 | case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: | |
1658 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
1659 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; | |
1660 | break; | |
1661 | case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: | |
1662 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
1663 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; | |
1664 | break; | |
1665 | default: | |
1666 | dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); | |
1667 | return -EINVAL; | |
1668 | } | |
1669 | ||
1670 | trf->framing = framing; | |
1671 | ||
1672 | if (iso_ctrl != trf->iso_ctrl) { | |
1673 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1674 | if (ret) | |
1675 | return ret; | |
1676 | ||
1677 | trf->iso_ctrl = iso_ctrl; | |
1678 | ||
1679 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, | |
e2f0f671 | 1680 | trf->modulator_sys_clk_ctrl); |
13b4272a MG |
1681 | if (ret) |
1682 | return ret; | |
1683 | } | |
1684 | ||
1685 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { | |
1686 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
e2f0f671 MG |
1687 | trf->chip_status_ctrl | |
1688 | TRF7970A_CHIP_STATUS_RF_ON); | |
13b4272a MG |
1689 | if (ret) |
1690 | return ret; | |
1691 | ||
1692 | trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; | |
1693 | } | |
1694 | ||
1695 | return 0; | |
1696 | } | |
1697 | ||
1698 | static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, | |
e2f0f671 | 1699 | int param) |
165063f1 MG |
1700 | { |
1701 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
13b4272a MG |
1702 | int ret; |
1703 | ||
1704 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); | |
1705 | ||
1706 | mutex_lock(&trf->lock); | |
1707 | ||
1708 | trf->is_initiator = false; | |
165063f1 | 1709 | |
13b4272a | 1710 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
e2f0f671 | 1711 | (trf->state == TRF7970A_ST_RF_OFF)) { |
13b4272a MG |
1712 | ret = trf7970a_switch_rf_on(trf); |
1713 | if (ret) | |
1714 | goto err_unlock; | |
1715 | } | |
1716 | ||
1717 | switch (type) { | |
1718 | case NFC_DIGITAL_CONFIG_RF_TECH: | |
1719 | ret = trf7970a_tg_config_rf_tech(trf, param); | |
1720 | break; | |
1721 | case NFC_DIGITAL_CONFIG_FRAMING: | |
1722 | ret = trf7970a_tg_config_framing(trf, param); | |
1723 | break; | |
1724 | default: | |
1725 | dev_dbg(trf->dev, "Unknown type: %d\n", type); | |
1726 | ret = -EINVAL; | |
1727 | } | |
165063f1 | 1728 | |
13b4272a MG |
1729 | err_unlock: |
1730 | mutex_unlock(&trf->lock); | |
1731 | return ret; | |
165063f1 MG |
1732 | } |
1733 | ||
cb174aba | 1734 | static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
e2f0f671 MG |
1735 | nfc_digital_cmd_complete_t cb, void *arg, |
1736 | bool mode_detect) | |
165063f1 MG |
1737 | { |
1738 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
13b4272a MG |
1739 | int ret; |
1740 | ||
13b4272a | 1741 | mutex_lock(&trf->lock); |
165063f1 | 1742 | |
13b4272a | 1743 | if ((trf->state != TRF7970A_ST_IDLE) && |
e2f0f671 | 1744 | (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { |
13b4272a | 1745 | dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, |
e2f0f671 | 1746 | trf->state); |
13b4272a MG |
1747 | ret = -EIO; |
1748 | goto out_err; | |
1749 | } | |
1750 | ||
1751 | if (trf->aborting) { | |
1752 | dev_dbg(trf->dev, "Abort process complete\n"); | |
1753 | trf->aborting = false; | |
1754 | ret = -ECANCELED; | |
1755 | goto out_err; | |
1756 | } | |
1757 | ||
1758 | trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, | |
e2f0f671 | 1759 | GFP_KERNEL); |
13b4272a MG |
1760 | if (!trf->rx_skb) { |
1761 | dev_dbg(trf->dev, "Can't alloc rx_skb\n"); | |
1762 | ret = -ENOMEM; | |
1763 | goto out_err; | |
1764 | } | |
1765 | ||
1766 | ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, | |
e2f0f671 MG |
1767 | TRF7970A_RX_SPECIAL_SETTINGS_HBT | |
1768 | TRF7970A_RX_SPECIAL_SETTINGS_M848 | | |
1769 | TRF7970A_RX_SPECIAL_SETTINGS_C424 | | |
1770 | TRF7970A_RX_SPECIAL_SETTINGS_C212); | |
13b4272a | 1771 | if (ret) |
fc0ae243 | 1772 | goto out_err; |
13b4272a MG |
1773 | |
1774 | ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, | |
e2f0f671 | 1775 | trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
13b4272a | 1776 | if (ret) |
fc0ae243 | 1777 | goto out_err; |
165063f1 | 1778 | |
13b4272a | 1779 | ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, |
e2f0f671 | 1780 | TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); |
13b4272a | 1781 | if (ret) |
fc0ae243 | 1782 | goto out_err; |
13b4272a MG |
1783 | |
1784 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, | |
e2f0f671 | 1785 | TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); |
13b4272a | 1786 | if (ret) |
fc0ae243 | 1787 | goto out_err; |
13b4272a MG |
1788 | |
1789 | trf->ddev = ddev; | |
1790 | trf->cb = cb; | |
1791 | trf->cb_arg = arg; | |
1792 | trf->timeout = timeout; | |
1793 | trf->ignore_timeout = false; | |
1794 | ||
1795 | ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); | |
1796 | if (ret) | |
1797 | goto out_err; | |
1798 | ||
cb174aba MG |
1799 | trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : |
1800 | TRF7970A_ST_LISTENING; | |
13b4272a MG |
1801 | |
1802 | schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); | |
1803 | ||
1804 | out_err: | |
1805 | mutex_unlock(&trf->lock); | |
1806 | return ret; | |
165063f1 MG |
1807 | } |
1808 | ||
cb174aba | 1809 | static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
e2f0f671 | 1810 | nfc_digital_cmd_complete_t cb, void *arg) |
cb174aba MG |
1811 | { |
1812 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1813 | ||
1814 | dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", | |
e2f0f671 | 1815 | trf->state, timeout); |
cb174aba MG |
1816 | |
1817 | return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); | |
1818 | } | |
1819 | ||
1820 | static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, | |
e2f0f671 MG |
1821 | u16 timeout, nfc_digital_cmd_complete_t cb, |
1822 | void *arg) | |
cb174aba MG |
1823 | { |
1824 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1825 | int ret; | |
1826 | ||
1827 | dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n", | |
e2f0f671 | 1828 | trf->state, timeout); |
cb174aba MG |
1829 | |
1830 | ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
e2f0f671 | 1831 | NFC_DIGITAL_RF_TECH_106A); |
cb174aba MG |
1832 | if (ret) |
1833 | return ret; | |
1834 | ||
1835 | ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
e2f0f671 | 1836 | NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); |
cb174aba MG |
1837 | if (ret) |
1838 | return ret; | |
1839 | ||
1840 | return _trf7970a_tg_listen(ddev, timeout, cb, arg, true); | |
1841 | } | |
1842 | ||
1843 | static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech) | |
1844 | { | |
1845 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1846 | ||
1847 | dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n", | |
e2f0f671 | 1848 | trf->state, trf->md_rf_tech); |
cb174aba MG |
1849 | |
1850 | *rf_tech = trf->md_rf_tech; | |
1851 | ||
1852 | return 0; | |
1853 | } | |
1854 | ||
165063f1 MG |
1855 | static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev) |
1856 | { | |
1857 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1858 | ||
1859 | dev_dbg(trf->dev, "Abort process initiated\n"); | |
1860 | ||
1861 | mutex_lock(&trf->lock); | |
5876bc75 MG |
1862 | |
1863 | switch (trf->state) { | |
1864 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
1865 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
1866 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
1867 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: | |
1868 | trf->aborting = true; | |
1869 | break; | |
13b4272a MG |
1870 | case TRF7970A_ST_LISTENING: |
1871 | trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work); | |
1872 | trf7970a_send_err_upstream(trf, -ECANCELED); | |
1873 | dev_dbg(trf->dev, "Abort process complete\n"); | |
1874 | break; | |
5876bc75 MG |
1875 | default: |
1876 | break; | |
1877 | } | |
1878 | ||
165063f1 MG |
1879 | mutex_unlock(&trf->lock); |
1880 | } | |
1881 | ||
1882 | static struct nfc_digital_ops trf7970a_nfc_ops = { | |
1883 | .in_configure_hw = trf7970a_in_configure_hw, | |
13b4272a | 1884 | .in_send_cmd = trf7970a_send_cmd, |
165063f1 | 1885 | .tg_configure_hw = trf7970a_tg_configure_hw, |
13b4272a | 1886 | .tg_send_cmd = trf7970a_send_cmd, |
165063f1 | 1887 | .tg_listen = trf7970a_tg_listen, |
cb174aba MG |
1888 | .tg_listen_md = trf7970a_tg_listen_md, |
1889 | .tg_get_rf_tech = trf7970a_tg_get_rf_tech, | |
165063f1 MG |
1890 | .switch_rf = trf7970a_switch_rf, |
1891 | .abort_cmd = trf7970a_abort_cmd, | |
1892 | }; | |
1893 | ||
ceccd6aa MG |
1894 | static int trf7970a_power_up(struct trf7970a *trf) |
1895 | { | |
1896 | int ret; | |
1897 | ||
1898 | dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state); | |
1899 | ||
1900 | if (trf->state != TRF7970A_ST_PWR_OFF) | |
1901 | return 0; | |
1902 | ||
1903 | ret = regulator_enable(trf->regulator); | |
1904 | if (ret) { | |
1905 | dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret); | |
1906 | return ret; | |
1907 | } | |
1908 | ||
1909 | usleep_range(5000, 6000); | |
1910 | ||
d34e48d6 MG |
1911 | if (trf->en2_gpiod && |
1912 | !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { | |
1913 | gpiod_set_value_cansleep(trf->en2_gpiod, 1); | |
1914 | usleep_range(1000, 2000); | |
ceccd6aa MG |
1915 | } |
1916 | ||
d34e48d6 | 1917 | gpiod_set_value_cansleep(trf->en_gpiod, 1); |
ceccd6aa MG |
1918 | |
1919 | usleep_range(20000, 21000); | |
1920 | ||
1921 | trf->state = TRF7970A_ST_RF_OFF; | |
1922 | ||
1923 | return 0; | |
1924 | } | |
1925 | ||
1926 | static int trf7970a_power_down(struct trf7970a *trf) | |
1927 | { | |
1928 | int ret; | |
1929 | ||
1930 | dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); | |
1931 | ||
1932 | if (trf->state == TRF7970A_ST_PWR_OFF) | |
1933 | return 0; | |
1934 | ||
1935 | if (trf->state != TRF7970A_ST_RF_OFF) { | |
1936 | dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", | |
e2f0f671 | 1937 | trf->state); |
ceccd6aa MG |
1938 | return -EBUSY; |
1939 | } | |
1940 | ||
d34e48d6 | 1941 | gpiod_set_value_cansleep(trf->en_gpiod, 0); |
67dec192 | 1942 | |
e2f0f671 | 1943 | if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) |
d34e48d6 | 1944 | gpiod_set_value_cansleep(trf->en2_gpiod, 0); |
ceccd6aa MG |
1945 | |
1946 | ret = regulator_disable(trf->regulator); | |
1947 | if (ret) | |
1948 | dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__, | |
e2f0f671 | 1949 | ret); |
ceccd6aa MG |
1950 | |
1951 | trf->state = TRF7970A_ST_PWR_OFF; | |
1952 | ||
1953 | return ret; | |
1954 | } | |
1955 | ||
b528281b MG |
1956 | static int trf7970a_startup(struct trf7970a *trf) |
1957 | { | |
1958 | int ret; | |
1959 | ||
1960 | ret = trf7970a_power_up(trf); | |
1961 | if (ret) | |
1962 | return ret; | |
1963 | ||
1964 | pm_runtime_set_active(trf->dev); | |
1965 | pm_runtime_enable(trf->dev); | |
1966 | pm_runtime_mark_last_busy(trf->dev); | |
1967 | ||
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | static void trf7970a_shutdown(struct trf7970a *trf) | |
1972 | { | |
1973 | switch (trf->state) { | |
1974 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
1975 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
1976 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
1977 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: | |
13b4272a | 1978 | case TRF7970A_ST_LISTENING: |
b528281b MG |
1979 | trf7970a_send_err_upstream(trf, -ECANCELED); |
1980 | /* FALLTHROUGH */ | |
1981 | case TRF7970A_ST_IDLE: | |
1982 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
1983 | trf7970a_switch_rf_off(trf); | |
1984 | break; | |
1985 | default: | |
1986 | break; | |
1987 | } | |
1988 | ||
1989 | pm_runtime_disable(trf->dev); | |
1990 | pm_runtime_set_suspended(trf->dev); | |
1991 | ||
1992 | trf7970a_power_down(trf); | |
1993 | } | |
1994 | ||
fd0c8280 MG |
1995 | static int trf7970a_get_autosuspend_delay(struct device_node *np) |
1996 | { | |
1997 | int autosuspend_delay, ret; | |
1998 | ||
1999 | ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay); | |
2000 | if (ret) | |
2001 | autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY; | |
2002 | ||
fd0c8280 MG |
2003 | return autosuspend_delay; |
2004 | } | |
2005 | ||
165063f1 MG |
2006 | static int trf7970a_probe(struct spi_device *spi) |
2007 | { | |
2008 | struct device_node *np = spi->dev.of_node; | |
165063f1 | 2009 | struct trf7970a *trf; |
fd0c8280 | 2010 | int uvolts, autosuspend_delay, ret; |
837eb4d2 | 2011 | u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; |
165063f1 MG |
2012 | |
2013 | if (!np) { | |
2014 | dev_err(&spi->dev, "No Device Tree entry\n"); | |
2015 | return -EINVAL; | |
2016 | } | |
2017 | ||
2018 | trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); | |
2019 | if (!trf) | |
2020 | return -ENOMEM; | |
2021 | ||
ceccd6aa | 2022 | trf->state = TRF7970A_ST_PWR_OFF; |
165063f1 MG |
2023 | trf->dev = &spi->dev; |
2024 | trf->spi = spi; | |
165063f1 MG |
2025 | |
2026 | spi->mode = SPI_MODE_1; | |
2027 | spi->bits_per_word = 8; | |
2028 | ||
24707296 MG |
2029 | ret = spi_setup(spi); |
2030 | if (ret < 0) { | |
2031 | dev_err(trf->dev, "Can't set up SPI Communication\n"); | |
2032 | return ret; | |
2033 | } | |
2034 | ||
ab714817 MG |
2035 | if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk")) |
2036 | trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE; | |
2037 | ||
772079eb MG |
2038 | if (of_property_read_bool(np, "irq-status-read-quirk")) |
2039 | trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; | |
2040 | ||
69f984f0 | 2041 | /* There are two enable pins - only EN must be present in the DT */ |
d34e48d6 MG |
2042 | trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0, |
2043 | GPIOD_OUT_LOW); | |
2044 | if (IS_ERR(trf->en_gpiod)) { | |
165063f1 | 2045 | dev_err(trf->dev, "No EN GPIO property\n"); |
d34e48d6 | 2046 | return PTR_ERR(trf->en_gpiod); |
165063f1 MG |
2047 | } |
2048 | ||
d34e48d6 MG |
2049 | trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1, |
2050 | GPIOD_OUT_LOW); | |
2051 | if (!trf->en2_gpiod) { | |
ce69b95c | 2052 | dev_info(trf->dev, "No EN2 GPIO property\n"); |
d34e48d6 MG |
2053 | } else if (IS_ERR(trf->en2_gpiod)) { |
2054 | dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n", | |
2055 | PTR_ERR(trf->en2_gpiod)); | |
2056 | return PTR_ERR(trf->en2_gpiod); | |
2057 | } else if (of_property_read_bool(np, "en2-rf-quirk")) { | |
2058 | trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; | |
165063f1 MG |
2059 | } |
2060 | ||
837eb4d2 | 2061 | of_property_read_u32(np, "clock-frequency", &clk_freq); |
e1038535 | 2062 | if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) && |
e2f0f671 | 2063 | (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { |
837eb4d2 | 2064 | dev_err(trf->dev, |
e2f0f671 | 2065 | "clock-frequency (%u Hz) unsupported\n", clk_freq); |
837eb4d2 GL |
2066 | return -EINVAL; |
2067 | } | |
2068 | ||
165063f1 | 2069 | ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, |
e2f0f671 MG |
2070 | trf7970a_irq, |
2071 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
2072 | "trf7970a", trf); | |
165063f1 MG |
2073 | if (ret) { |
2074 | dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); | |
2075 | return ret; | |
2076 | } | |
2077 | ||
2078 | mutex_init(&trf->lock); | |
2079 | INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); | |
2080 | ||
2081 | trf->regulator = devm_regulator_get(&spi->dev, "vin"); | |
2082 | if (IS_ERR(trf->regulator)) { | |
2083 | ret = PTR_ERR(trf->regulator); | |
2084 | dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); | |
2085 | goto err_destroy_lock; | |
2086 | } | |
2087 | ||
2088 | ret = regulator_enable(trf->regulator); | |
2089 | if (ret) { | |
2090 | dev_err(trf->dev, "Can't enable VIN: %d\n", ret); | |
2091 | goto err_destroy_lock; | |
2092 | } | |
2093 | ||
a34631c2 | 2094 | uvolts = regulator_get_voltage(trf->regulator); |
ebcc5a0d MG |
2095 | if (uvolts > 4000000) |
2096 | trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; | |
2097 | ||
49d22c70 GL |
2098 | trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); |
2099 | if (IS_ERR(trf->regulator)) { | |
2100 | ret = PTR_ERR(trf->regulator); | |
2101 | dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); | |
2102 | goto err_destroy_lock; | |
2103 | } | |
2104 | ||
2105 | ret = regulator_enable(trf->regulator); | |
2106 | if (ret) { | |
2107 | dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); | |
2108 | goto err_destroy_lock; | |
2109 | } | |
2110 | ||
2111 | if (regulator_get_voltage(trf->regulator) == 1800000) { | |
2112 | trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; | |
2113 | dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); | |
2114 | } | |
2115 | ||
165063f1 | 2116 | trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, |
e2f0f671 MG |
2117 | TRF7970A_SUPPORTED_PROTOCOLS, |
2118 | NFC_DIGITAL_DRV_CAPS_IN_CRC | | |
2119 | NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, | |
2120 | 0); | |
165063f1 MG |
2121 | if (!trf->ddev) { |
2122 | dev_err(trf->dev, "Can't allocate NFC digital device\n"); | |
2123 | ret = -ENOMEM; | |
2124 | goto err_disable_regulator; | |
2125 | } | |
2126 | ||
2127 | nfc_digital_set_parent_dev(trf->ddev, trf->dev); | |
2128 | nfc_digital_set_drvdata(trf->ddev, trf); | |
2129 | spi_set_drvdata(spi, trf); | |
2130 | ||
fd0c8280 MG |
2131 | autosuspend_delay = trf7970a_get_autosuspend_delay(np); |
2132 | ||
2133 | pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); | |
e6403b7c | 2134 | pm_runtime_use_autosuspend(trf->dev); |
ceccd6aa | 2135 | |
b528281b | 2136 | ret = trf7970a_startup(trf); |
ceccd6aa MG |
2137 | if (ret) |
2138 | goto err_free_ddev; | |
2139 | ||
165063f1 MG |
2140 | ret = nfc_digital_register_device(trf->ddev); |
2141 | if (ret) { | |
2142 | dev_err(trf->dev, "Can't register NFC digital device: %d\n", | |
e2f0f671 | 2143 | ret); |
b528281b | 2144 | goto err_shutdown; |
165063f1 MG |
2145 | } |
2146 | ||
2147 | return 0; | |
2148 | ||
b528281b MG |
2149 | err_shutdown: |
2150 | trf7970a_shutdown(trf); | |
ceccd6aa | 2151 | err_free_ddev: |
165063f1 MG |
2152 | nfc_digital_free_device(trf->ddev); |
2153 | err_disable_regulator: | |
2154 | regulator_disable(trf->regulator); | |
2155 | err_destroy_lock: | |
2156 | mutex_destroy(&trf->lock); | |
2157 | return ret; | |
2158 | } | |
2159 | ||
2160 | static int trf7970a_remove(struct spi_device *spi) | |
2161 | { | |
2162 | struct trf7970a *trf = spi_get_drvdata(spi); | |
2163 | ||
2164 | mutex_lock(&trf->lock); | |
2165 | ||
b528281b | 2166 | trf7970a_shutdown(trf); |
ceccd6aa MG |
2167 | |
2168 | mutex_unlock(&trf->lock); | |
e6403b7c | 2169 | |
165063f1 MG |
2170 | nfc_digital_unregister_device(trf->ddev); |
2171 | nfc_digital_free_device(trf->ddev); | |
2172 | ||
2173 | regulator_disable(trf->regulator); | |
2174 | ||
2175 | mutex_destroy(&trf->lock); | |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
77c9539d MG |
2180 | #ifdef CONFIG_PM_SLEEP |
2181 | static int trf7970a_suspend(struct device *dev) | |
2182 | { | |
88e2ce01 | 2183 | struct spi_device *spi = to_spi_device(dev); |
77c9539d | 2184 | struct trf7970a *trf = spi_get_drvdata(spi); |
77c9539d MG |
2185 | |
2186 | dev_dbg(dev, "Suspend\n"); | |
2187 | ||
2188 | mutex_lock(&trf->lock); | |
2189 | ||
2190 | trf7970a_shutdown(trf); | |
2191 | ||
2192 | mutex_unlock(&trf->lock); | |
2193 | ||
671970f5 | 2194 | return 0; |
77c9539d MG |
2195 | } |
2196 | ||
2197 | static int trf7970a_resume(struct device *dev) | |
2198 | { | |
88e2ce01 | 2199 | struct spi_device *spi = to_spi_device(dev); |
77c9539d | 2200 | struct trf7970a *trf = spi_get_drvdata(spi); |
55ef2e75 | 2201 | int ret; |
77c9539d MG |
2202 | |
2203 | dev_dbg(dev, "Resume\n"); | |
2204 | ||
2205 | mutex_lock(&trf->lock); | |
2206 | ||
2207 | ret = trf7970a_startup(trf); | |
2208 | ||
2209 | mutex_unlock(&trf->lock); | |
2210 | ||
2211 | return ret; | |
2212 | } | |
2213 | #endif | |
2214 | ||
e8a9235c | 2215 | #ifdef CONFIG_PM |
e6403b7c MG |
2216 | static int trf7970a_pm_runtime_suspend(struct device *dev) |
2217 | { | |
88e2ce01 | 2218 | struct spi_device *spi = to_spi_device(dev); |
e6403b7c MG |
2219 | struct trf7970a *trf = spi_get_drvdata(spi); |
2220 | int ret; | |
2221 | ||
2222 | dev_dbg(dev, "Runtime suspend\n"); | |
2223 | ||
ceccd6aa | 2224 | mutex_lock(&trf->lock); |
e6403b7c | 2225 | |
ceccd6aa | 2226 | ret = trf7970a_power_down(trf); |
e6403b7c | 2227 | |
ceccd6aa | 2228 | mutex_unlock(&trf->lock); |
e6403b7c MG |
2229 | |
2230 | return ret; | |
2231 | } | |
2232 | ||
2233 | static int trf7970a_pm_runtime_resume(struct device *dev) | |
2234 | { | |
88e2ce01 | 2235 | struct spi_device *spi = to_spi_device(dev); |
e6403b7c MG |
2236 | struct trf7970a *trf = spi_get_drvdata(spi); |
2237 | int ret; | |
2238 | ||
2239 | dev_dbg(dev, "Runtime resume\n"); | |
2240 | ||
ceccd6aa MG |
2241 | ret = trf7970a_power_up(trf); |
2242 | if (!ret) | |
2243 | pm_runtime_mark_last_busy(dev); | |
e6403b7c | 2244 | |
ceccd6aa | 2245 | return ret; |
e6403b7c MG |
2246 | } |
2247 | #endif | |
2248 | ||
2249 | static const struct dev_pm_ops trf7970a_pm_ops = { | |
77c9539d | 2250 | SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) |
e6403b7c | 2251 | SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, |
e2f0f671 | 2252 | trf7970a_pm_runtime_resume, NULL) |
e6403b7c MG |
2253 | }; |
2254 | ||
3c39c1a5 | 2255 | static const struct of_device_id trf7970a_of_match[] = { |
e2f0f671 | 2256 | {.compatible = "ti,trf7970a",}, |
fcc652f6 | 2257 | {}, |
3c39c1a5 | 2258 | }; |
e2f0f671 | 2259 | |
3c39c1a5 JMC |
2260 | MODULE_DEVICE_TABLE(of, trf7970a_of_match); |
2261 | ||
165063f1 | 2262 | static const struct spi_device_id trf7970a_id_table[] = { |
e2f0f671 MG |
2263 | {"trf7970a", 0}, |
2264 | {} | |
165063f1 | 2265 | }; |
e2f0f671 | 2266 | |
165063f1 MG |
2267 | MODULE_DEVICE_TABLE(spi, trf7970a_id_table); |
2268 | ||
2269 | static struct spi_driver trf7970a_spi_driver = { | |
2270 | .probe = trf7970a_probe, | |
2271 | .remove = trf7970a_remove, | |
2272 | .id_table = trf7970a_id_table, | |
e2f0f671 MG |
2273 | .driver = { |
2274 | .name = "trf7970a", | |
2275 | .of_match_table = of_match_ptr(trf7970a_of_match), | |
2276 | .pm = &trf7970a_pm_ops, | |
165063f1 MG |
2277 | }, |
2278 | }; | |
2279 | ||
2280 | module_spi_driver(trf7970a_spi_driver); | |
2281 | ||
2282 | MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); | |
2283 | MODULE_LICENSE("GPL v2"); | |
2284 | MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); |