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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> | |
23 | #include <linux/gpio.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/of_gpio.h> | |
26 | #include <linux/spi/spi.h> | |
27 | #include <linux/regulator/consumer.h> | |
28 | ||
29 | #include <net/nfc/nfc.h> | |
30 | #include <net/nfc/digital.h> | |
31 | ||
32 | /* There are 3 ways the host can communicate with the trf7970a: | |
33 | * parallel mode, SPI with Slave Select (SS) mode, and SPI without | |
34 | * SS mode. The driver only supports the two SPI modes. | |
35 | * | |
36 | * The trf7970a is very timing sensitive and the VIN, EN2, and EN | |
37 | * pins must asserted in that order and with specific delays in between. | |
38 | * The delays used in the driver were provided by TI and have been | |
95064bd9 MG |
39 | * confirmed to work with this driver. There is a bug with the current |
40 | * version of the trf7970a that requires that EN2 remain low no matter | |
41 | * what. If it goes high, it will generate an RF field even when in | |
42 | * passive target mode. TI has indicated that the chip will work okay | |
43 | * when EN2 is left low. The 'en2-rf-quirk' device tree property | |
44 | * indicates that trf7970a currently being used has the erratum and | |
45 | * that EN2 must be kept low. | |
165063f1 MG |
46 | * |
47 | * Timeouts are implemented using the delayed workqueue kernel facility. | |
48 | * Timeouts are required so things don't hang when there is no response | |
49 | * from the trf7970a (or tag). Using this mechanism creates a race with | |
50 | * interrupts, however. That is, an interrupt and a timeout could occur | |
51 | * closely enough together that one is blocked by the mutex while the other | |
52 | * executes. When the timeout handler executes first and blocks the | |
53 | * interrupt handler, it will eventually set the state to IDLE so the | |
54 | * interrupt handler will check the state and exit with no harm done. | |
55 | * When the interrupt handler executes first and blocks the timeout handler, | |
56 | * the cancel_delayed_work() call will know that it didn't cancel the | |
57 | * work item (i.e., timeout) and will return zero. That return code is | |
58 | * used by the timer handler to indicate that it should ignore the timeout | |
59 | * once its unblocked. | |
60 | * | |
61 | * Aborting an active command isn't as simple as it seems because the only | |
62 | * way to abort a command that's already been sent to the tag is so turn | |
63 | * off power to the tag. If we do that, though, we'd have to go through | |
64 | * the entire anticollision procedure again but the digital layer doesn't | |
13b4272a | 65 | * support that. So, if an abort is received before trf7970a_send_cmd() |
165063f1 MG |
66 | * has sent the command to the tag, it simply returns -ECANCELED. If the |
67 | * command has already been sent to the tag, then the driver continues | |
68 | * normally and recieves the response data (or error) but just before | |
69 | * sending the data upstream, it frees the rx_skb and sends -ECANCELED | |
70 | * upstream instead. If the command failed, that error will be sent | |
71 | * upstream. | |
72 | * | |
73 | * When recieving data from a tag and the interrupt status register has | |
74 | * only the SRX bit set, it means that all of the data has been received | |
75 | * (once what's in the fifo has been read). However, depending on timing | |
76 | * an interrupt status with only the SRX bit set may not be recived. In | |
5fa3af35 MG |
77 | * those cases, the timeout mechanism is used to wait 20 ms in case more |
78 | * data arrives. After 20 ms, it is assumed that all of the data has been | |
165063f1 MG |
79 | * received and the accumulated rx data is sent upstream. The |
80 | * 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose | |
81 | * (i.e., it indicates that some data has been received but we're not sure | |
82 | * if there is more coming so a timeout in this state means all data has | |
5fa3af35 MG |
83 | * been received and there isn't an error). The delay is 20 ms since delays |
84 | * of ~16 ms have been observed during testing. | |
165063f1 | 85 | * |
38b4eb1f MG |
86 | * When transmitting a frame larger than the FIFO size (127 bytes), the |
87 | * driver will wait 20 ms for the FIFO to drain past the low-watermark | |
88 | * and generate an interrupt. The low-watermark set to 32 bytes so the | |
89 | * interrupt should fire after 127 - 32 = 95 bytes have been sent. At | |
90 | * the lowest possible bit rate (6.62 kbps for 15693), it will take up | |
91 | * to ~14.35 ms so 20 ms is used for the timeout. | |
92 | * | |
165063f1 MG |
93 | * Type 2 write and sector select commands respond with a 4-bit ACK or NACK. |
94 | * Having only 4 bits in the FIFO won't normally generate an interrupt so | |
95 | * driver enables the '4_bit_RX' bit of the Special Functions register 1 | |
96 | * to cause an interrupt in that case. Leaving that bit for a read command | |
97 | * messes up the data returned so it is only enabled when the framing is | |
98 | * 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command. | |
99 | * Unfortunately, that means that the driver has to peek into tx frames | |
100 | * when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by | |
101 | * the trf7970a_per_cmd_config() routine. | |
9d9304b3 MG |
102 | * |
103 | * ISO/IEC 15693 frames specify whether to use single or double sub-carrier | |
104 | * frequencies and whether to use low or high data rates in the flags byte | |
105 | * of the frame. This means that the driver has to peek at all 15693 frames | |
106 | * to determine what speed to set the communication to. In addition, write | |
107 | * and lock commands use the OPTION flag to indicate that an EOF must be | |
108 | * sent to the tag before it will send its response. So the driver has to | |
109 | * examine all frames for that reason too. | |
110 | * | |
111 | * It is unclear how long to wait before sending the EOF. According to the | |
112 | * Note under Table 1-1 in section 1.6 of | |
113 | * http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least | |
114 | * 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long | |
38b4eb1f MG |
115 | * enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain |
116 | * up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to | |
117 | * ensure the wait is long enough before sending the EOF. This seems to work | |
9d9304b3 | 118 | * reliably. |
165063f1 MG |
119 | */ |
120 | ||
80062891 | 121 | #define TRF7970A_SUPPORTED_PROTOCOLS \ |
9d9304b3 | 122 | (NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \ |
6857bb96 | 123 | NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \ |
13b4272a | 124 | NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK) |
165063f1 | 125 | |
e6403b7c | 126 | #define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */ |
837eb4d2 GL |
127 | #define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000 |
128 | #define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000 | |
129 | ||
e6403b7c | 130 | |
165063f1 MG |
131 | #define TRF7970A_RX_SKB_ALLOC_SIZE 256 |
132 | ||
1568bfef | 133 | #define TRF7970A_FIFO_SIZE 127 |
165063f1 MG |
134 | |
135 | /* TX length is 3 nibbles long ==> 4KB - 1 bytes max */ | |
136 | #define TRF7970A_TX_MAX (4096 - 1) | |
137 | ||
1961843c | 138 | #define TRF7970A_WAIT_FOR_TX_IRQ 20 |
5fa3af35 | 139 | #define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20 |
38b4eb1f MG |
140 | #define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20 |
141 | #define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40 | |
165063f1 | 142 | |
4e64eff8 MG |
143 | /* Guard times for various RF technologies (in us) */ |
144 | #define TRF7970A_GUARD_TIME_NFCA 5000 | |
145 | #define TRF7970A_GUARD_TIME_NFCB 5000 | |
146 | #define TRF7970A_GUARD_TIME_NFCF 20000 | |
147 | #define TRF7970A_GUARD_TIME_15693 1000 | |
148 | ||
165063f1 MG |
149 | /* Quirks */ |
150 | /* Erratum: When reading IRQ Status register on trf7970a, we must issue a | |
151 | * read continuous command for IRQ Status and Collision Position registers. | |
152 | */ | |
772079eb | 153 | #define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0) |
95064bd9 | 154 | #define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1) |
ab714817 | 155 | #define TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE BIT(2) |
165063f1 MG |
156 | |
157 | /* Direct commands */ | |
158 | #define TRF7970A_CMD_IDLE 0x00 | |
159 | #define TRF7970A_CMD_SOFT_INIT 0x03 | |
160 | #define TRF7970A_CMD_RF_COLLISION 0x04 | |
161 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05 | |
162 | #define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06 | |
163 | #define TRF7970A_CMD_FIFO_RESET 0x0f | |
164 | #define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10 | |
165 | #define TRF7970A_CMD_TRANSMIT 0x11 | |
166 | #define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12 | |
167 | #define TRF7970A_CMD_DELAY_TRANSMIT 0x13 | |
168 | #define TRF7970A_CMD_EOF 0x14 | |
169 | #define TRF7970A_CMD_CLOSE_SLOT 0x15 | |
170 | #define TRF7970A_CMD_BLOCK_RX 0x16 | |
171 | #define TRF7970A_CMD_ENABLE_RX 0x17 | |
851ee3cb MG |
172 | #define TRF7970A_CMD_TEST_INT_RF 0x18 |
173 | #define TRF7970A_CMD_TEST_EXT_RF 0x19 | |
165063f1 MG |
174 | #define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a |
175 | ||
176 | /* Bits determining whether its a direct command or register R/W, | |
177 | * whether to use a continuous SPI transaction or not, and the actual | |
178 | * direct cmd opcode or regster address. | |
179 | */ | |
180 | #define TRF7970A_CMD_BIT_CTRL BIT(7) | |
181 | #define TRF7970A_CMD_BIT_RW BIT(6) | |
182 | #define TRF7970A_CMD_BIT_CONTINUOUS BIT(5) | |
183 | #define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f) | |
184 | ||
185 | /* Registers addresses */ | |
186 | #define TRF7970A_CHIP_STATUS_CTRL 0x00 | |
187 | #define TRF7970A_ISO_CTRL 0x01 | |
188 | #define TRF7970A_ISO14443B_TX_OPTIONS 0x02 | |
189 | #define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03 | |
190 | #define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04 | |
191 | #define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05 | |
192 | #define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06 | |
193 | #define TRF7970A_RX_NO_RESPONSE_WAIT 0x07 | |
194 | #define TRF7970A_RX_WAIT_TIME 0x08 | |
195 | #define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09 | |
196 | #define TRF7970A_RX_SPECIAL_SETTINGS 0x0a | |
197 | #define TRF7970A_REG_IO_CTRL 0x0b | |
198 | #define TRF7970A_IRQ_STATUS 0x0c | |
199 | #define TRF7970A_COLLISION_IRQ_MASK 0x0d | |
200 | #define TRF7970A_COLLISION_POSITION 0x0e | |
201 | #define TRF7970A_RSSI_OSC_STATUS 0x0f | |
202 | #define TRF7970A_SPECIAL_FCN_REG1 0x10 | |
203 | #define TRF7970A_SPECIAL_FCN_REG2 0x11 | |
204 | #define TRF7970A_RAM1 0x12 | |
205 | #define TRF7970A_RAM2 0x13 | |
206 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14 | |
207 | #define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16 | |
208 | #define TRF7970A_NFCID1 0x17 | |
209 | #define TRF7970A_NFC_TARGET_LEVEL 0x18 | |
210 | #define TRF79070A_NFC_TARGET_PROTOCOL 0x19 | |
211 | #define TRF7970A_TEST_REGISTER1 0x1a | |
212 | #define TRF7970A_TEST_REGISTER2 0x1b | |
213 | #define TRF7970A_FIFO_STATUS 0x1c | |
214 | #define TRF7970A_TX_LENGTH_BYTE1 0x1d | |
215 | #define TRF7970A_TX_LENGTH_BYTE2 0x1e | |
216 | #define TRF7970A_FIFO_IO_REGISTER 0x1f | |
217 | ||
218 | /* Chip Status Control Register Bits */ | |
219 | #define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0) | |
220 | #define TRF7970A_CHIP_STATUS_REC_ON BIT(1) | |
221 | #define TRF7970A_CHIP_STATUS_AGC_ON BIT(2) | |
222 | #define TRF7970A_CHIP_STATUS_PM_ON BIT(3) | |
223 | #define TRF7970A_CHIP_STATUS_RF_PWR BIT(4) | |
224 | #define TRF7970A_CHIP_STATUS_RF_ON BIT(5) | |
225 | #define TRF7970A_CHIP_STATUS_DIRECT BIT(6) | |
226 | #define TRF7970A_CHIP_STATUS_STBY BIT(7) | |
227 | ||
228 | /* ISO Control Register Bits */ | |
229 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00 | |
230 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01 | |
231 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02 | |
232 | #define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03 | |
233 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04 | |
234 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05 | |
235 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06 | |
236 | #define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07 | |
237 | #define TRF7970A_ISO_CTRL_14443A_106 0x08 | |
238 | #define TRF7970A_ISO_CTRL_14443A_212 0x09 | |
239 | #define TRF7970A_ISO_CTRL_14443A_424 0x0a | |
240 | #define TRF7970A_ISO_CTRL_14443A_848 0x0b | |
241 | #define TRF7970A_ISO_CTRL_14443B_106 0x0c | |
242 | #define TRF7970A_ISO_CTRL_14443B_212 0x0d | |
243 | #define TRF7970A_ISO_CTRL_14443B_424 0x0e | |
244 | #define TRF7970A_ISO_CTRL_14443B_848 0x0f | |
245 | #define TRF7970A_ISO_CTRL_FELICA_212 0x1a | |
246 | #define TRF7970A_ISO_CTRL_FELICA_424 0x1b | |
13b4272a MG |
247 | #define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01 |
248 | #define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02 | |
249 | #define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03 | |
250 | #define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00 | |
251 | #define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01 | |
252 | #define TRF7970A_ISO_CTRL_NFC_CE BIT(2) | |
253 | #define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3) | |
254 | #define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4) | |
255 | #define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5) | |
165063f1 MG |
256 | #define TRF7970A_ISO_CTRL_RFID BIT(5) |
257 | #define TRF7970A_ISO_CTRL_DIR_MODE BIT(6) | |
258 | #define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */ | |
259 | ||
260 | #define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f | |
261 | ||
262 | /* Modulator and SYS_CLK Control Register Bits */ | |
263 | #define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7) | |
264 | #define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0)) | |
265 | #define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1)) | |
266 | #define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2)) | |
267 | #define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3)) | |
268 | #define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4)) | |
269 | #define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5)) | |
270 | #define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6)) | |
271 | #define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7)) | |
272 | #define TRF7970A_MODULATOR_EN_ANA BIT(3) | |
273 | #define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4) | |
274 | #define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0)) | |
275 | #define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1)) | |
276 | #define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2)) | |
277 | #define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3)) | |
278 | #define TRF7970A_MODULATOR_EN_OOK BIT(6) | |
279 | #define TRF7970A_MODULATOR_27MHZ BIT(7) | |
280 | ||
13b4272a MG |
281 | #define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0) |
282 | #define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1) | |
283 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2) | |
284 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2) | |
285 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2) | |
286 | #define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2) | |
287 | #define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4) | |
288 | #define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5) | |
289 | #define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6) | |
290 | #define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7) | |
291 | ||
292 | #define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07) | |
293 | #define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5) | |
294 | #define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6) | |
295 | #define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7) | |
296 | ||
165063f1 MG |
297 | /* IRQ Status Register Bits */ |
298 | #define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */ | |
13b4272a | 299 | #define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0) |
165063f1 MG |
300 | #define TRF7970A_IRQ_STATUS_COL BIT(1) |
301 | #define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2) | |
13b4272a | 302 | #define TRF7970A_IRQ_STATUS_NFC_RF BIT(2) |
165063f1 | 303 | #define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3) |
13b4272a | 304 | #define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3) |
165063f1 | 305 | #define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4) |
13b4272a | 306 | #define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4) |
165063f1 MG |
307 | #define TRF7970A_IRQ_STATUS_FIFO BIT(5) |
308 | #define TRF7970A_IRQ_STATUS_SRX BIT(6) | |
309 | #define TRF7970A_IRQ_STATUS_TX BIT(7) | |
310 | ||
311 | #define TRF7970A_IRQ_STATUS_ERROR \ | |
312 | (TRF7970A_IRQ_STATUS_COL | \ | |
313 | TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \ | |
314 | TRF7970A_IRQ_STATUS_PARITY_ERROR | \ | |
315 | TRF7970A_IRQ_STATUS_CRC_ERROR) | |
316 | ||
851ee3cb MG |
317 | #define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0)) |
318 | #define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3)) | |
319 | #define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6) | |
320 | ||
165063f1 MG |
321 | #define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0) |
322 | #define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1) | |
323 | #define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2) | |
324 | #define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3) | |
325 | #define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4) | |
326 | #define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5) | |
327 | ||
328 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2) | |
329 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2) | |
330 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2) | |
331 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2) | |
332 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0 | |
333 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1 | |
334 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2 | |
335 | #define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3 | |
336 | ||
13b4272a MG |
337 | #define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07) |
338 | #define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7) | |
339 | ||
340 | #define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07) | |
341 | #define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3) | |
ae291f79 | 342 | #define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5) |
13b4272a MG |
343 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6) |
344 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6) | |
345 | #define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6) | |
346 | ||
cb174aba MG |
347 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0) |
348 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1) | |
349 | #define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1)) | |
350 | #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2) | |
351 | #define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3) | |
352 | #define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4) | |
353 | #define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6) | |
354 | #define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7) | |
355 | ||
356 | #define TRF79070A_NFC_TARGET_PROTOCOL_106A \ | |
357 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
358 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
359 | TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \ | |
360 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) | |
361 | ||
362 | #define TRF79070A_NFC_TARGET_PROTOCOL_106B \ | |
363 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
364 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
365 | TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \ | |
366 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106) | |
367 | ||
368 | #define TRF79070A_NFC_TARGET_PROTOCOL_212F \ | |
369 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
370 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
371 | TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ | |
372 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212) | |
373 | ||
374 | #define TRF79070A_NFC_TARGET_PROTOCOL_424F \ | |
375 | (TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \ | |
376 | TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \ | |
377 | TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \ | |
378 | TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424) | |
379 | ||
165063f1 MG |
380 | #define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7) |
381 | ||
382 | /* NFC (ISO/IEC 14443A) Type 2 Tag commands */ | |
383 | #define NFC_T2T_CMD_READ 0x30 | |
384 | ||
9d9304b3 MG |
385 | /* ISO 15693 commands codes */ |
386 | #define ISO15693_CMD_INVENTORY 0x01 | |
387 | #define ISO15693_CMD_READ_SINGLE_BLOCK 0x20 | |
388 | #define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21 | |
389 | #define ISO15693_CMD_LOCK_BLOCK 0x22 | |
390 | #define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23 | |
391 | #define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24 | |
392 | #define ISO15693_CMD_SELECT 0x25 | |
393 | #define ISO15693_CMD_RESET_TO_READY 0x26 | |
394 | #define ISO15693_CMD_WRITE_AFI 0x27 | |
395 | #define ISO15693_CMD_LOCK_AFI 0x28 | |
396 | #define ISO15693_CMD_WRITE_DSFID 0x29 | |
397 | #define ISO15693_CMD_LOCK_DSFID 0x2a | |
398 | #define ISO15693_CMD_GET_SYSTEM_INFO 0x2b | |
399 | #define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c | |
400 | ||
401 | /* ISO 15693 request and response flags */ | |
402 | #define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0) | |
403 | #define ISO15693_REQ_FLAG_DATA_RATE BIT(1) | |
404 | #define ISO15693_REQ_FLAG_INVENTORY BIT(2) | |
405 | #define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3) | |
406 | #define ISO15693_REQ_FLAG_SELECT BIT(4) | |
407 | #define ISO15693_REQ_FLAG_AFI BIT(4) | |
408 | #define ISO15693_REQ_FLAG_ADDRESS BIT(5) | |
409 | #define ISO15693_REQ_FLAG_NB_SLOTS BIT(5) | |
410 | #define ISO15693_REQ_FLAG_OPTION BIT(6) | |
411 | ||
412 | #define ISO15693_REQ_FLAG_SPEED_MASK \ | |
413 | (ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE) | |
414 | ||
165063f1 | 415 | enum trf7970a_state { |
ceccd6aa | 416 | TRF7970A_ST_PWR_OFF, |
b5e17d9b | 417 | TRF7970A_ST_RF_OFF, |
165063f1 MG |
418 | TRF7970A_ST_IDLE, |
419 | TRF7970A_ST_IDLE_RX_BLOCKED, | |
420 | TRF7970A_ST_WAIT_FOR_TX_FIFO, | |
421 | TRF7970A_ST_WAIT_FOR_RX_DATA, | |
422 | TRF7970A_ST_WAIT_FOR_RX_DATA_CONT, | |
9d9304b3 | 423 | TRF7970A_ST_WAIT_TO_ISSUE_EOF, |
13b4272a | 424 | TRF7970A_ST_LISTENING, |
cb174aba | 425 | TRF7970A_ST_LISTENING_MD, |
165063f1 MG |
426 | TRF7970A_ST_MAX |
427 | }; | |
428 | ||
429 | struct trf7970a { | |
430 | enum trf7970a_state state; | |
431 | struct device *dev; | |
432 | struct spi_device *spi; | |
433 | struct regulator *regulator; | |
434 | struct nfc_digital_dev *ddev; | |
435 | u32 quirks; | |
13b4272a | 436 | bool is_initiator; |
165063f1 MG |
437 | bool aborting; |
438 | struct sk_buff *tx_skb; | |
439 | struct sk_buff *rx_skb; | |
440 | nfc_digital_cmd_complete_t cb; | |
441 | void *cb_arg; | |
ebcc5a0d | 442 | u8 chip_status_ctrl; |
165063f1 | 443 | u8 iso_ctrl; |
49d19cc7 | 444 | u8 iso_ctrl_tech; |
12e9ade3 | 445 | u8 modulator_sys_clk_ctrl; |
165063f1 | 446 | u8 special_fcn_reg1; |
49d22c70 | 447 | u8 io_ctrl; |
4e64eff8 | 448 | unsigned int guard_time; |
165063f1 MG |
449 | int technology; |
450 | int framing; | |
cb174aba | 451 | u8 md_rf_tech; |
165063f1 | 452 | u8 tx_cmd; |
9d9304b3 | 453 | bool issue_eof; |
ab714817 | 454 | bool adjust_resp_len; |
165063f1 MG |
455 | int en2_gpio; |
456 | int en_gpio; | |
457 | struct mutex lock; | |
458 | unsigned int timeout; | |
459 | bool ignore_timeout; | |
460 | struct delayed_work timeout_work; | |
461 | }; | |
462 | ||
463 | ||
464 | static int trf7970a_cmd(struct trf7970a *trf, u8 opcode) | |
465 | { | |
466 | u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode); | |
467 | int ret; | |
468 | ||
469 | dev_dbg(trf->dev, "cmd: 0x%x\n", cmd); | |
470 | ||
471 | ret = spi_write(trf->spi, &cmd, 1); | |
472 | if (ret) | |
473 | dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd, | |
474 | ret); | |
475 | return ret; | |
476 | } | |
477 | ||
478 | static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) | |
479 | { | |
480 | u8 addr = TRF7970A_CMD_BIT_RW | reg; | |
481 | int ret; | |
482 | ||
483 | ret = spi_write_then_read(trf->spi, &addr, 1, val, 1); | |
484 | if (ret) | |
485 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, | |
486 | ret); | |
487 | ||
488 | dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val); | |
489 | ||
490 | return ret; | |
491 | } | |
492 | ||
3e7f3356 | 493 | static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, size_t len) |
165063f1 MG |
494 | { |
495 | u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS; | |
3e7f3356 MG |
496 | struct spi_transfer t[2]; |
497 | struct spi_message m; | |
165063f1 MG |
498 | int ret; |
499 | ||
500 | dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len); | |
501 | ||
3e7f3356 MG |
502 | spi_message_init(&m); |
503 | ||
504 | memset(&t, 0, sizeof(t)); | |
505 | ||
506 | t[0].tx_buf = &addr; | |
507 | t[0].len = sizeof(addr); | |
508 | spi_message_add_tail(&t[0], &m); | |
509 | ||
510 | t[1].rx_buf = buf; | |
511 | t[1].len = len; | |
512 | spi_message_add_tail(&t[1], &m); | |
513 | ||
514 | ret = spi_sync(trf->spi, &m); | |
165063f1 MG |
515 | if (ret) |
516 | dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr, | |
517 | ret); | |
518 | return ret; | |
519 | } | |
520 | ||
521 | static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val) | |
522 | { | |
523 | u8 buf[2] = { reg, val }; | |
524 | int ret; | |
525 | ||
526 | dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val); | |
527 | ||
528 | ret = spi_write(trf->spi, buf, 2); | |
529 | if (ret) | |
530 | dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__, | |
531 | buf[0], buf[1], ret); | |
532 | ||
533 | return ret; | |
534 | } | |
535 | ||
536 | static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status) | |
537 | { | |
538 | int ret; | |
539 | u8 buf[2]; | |
540 | u8 addr; | |
541 | ||
542 | addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW; | |
543 | ||
772079eb | 544 | if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) { |
165063f1 MG |
545 | addr |= TRF7970A_CMD_BIT_CONTINUOUS; |
546 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); | |
547 | } else { | |
548 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1); | |
549 | } | |
550 | ||
551 | if (ret) | |
552 | dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n", | |
553 | __func__, ret); | |
554 | else | |
555 | *status = buf[0]; | |
556 | ||
557 | return ret; | |
558 | } | |
559 | ||
cb174aba MG |
560 | static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto) |
561 | { | |
562 | int ret; | |
563 | u8 buf[2]; | |
564 | u8 addr; | |
565 | ||
566 | addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW | | |
567 | TRF7970A_CMD_BIT_CONTINUOUS; | |
568 | ||
569 | ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2); | |
570 | if (ret) | |
571 | dev_err(trf->dev, "%s - target_proto: Read failed: %d\n", | |
572 | __func__, ret); | |
573 | else | |
574 | *target_proto = buf[0]; | |
575 | ||
576 | return ret; | |
577 | } | |
578 | ||
579 | static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech) | |
580 | { | |
581 | int ret; | |
582 | u8 target_proto, tech; | |
583 | ||
584 | ret = trf7970a_read_target_proto(trf, &target_proto); | |
585 | if (ret) | |
586 | return ret; | |
587 | ||
588 | switch (target_proto) { | |
589 | case TRF79070A_NFC_TARGET_PROTOCOL_106A: | |
590 | tech = NFC_DIGITAL_RF_TECH_106A; | |
591 | break; | |
592 | case TRF79070A_NFC_TARGET_PROTOCOL_106B: | |
593 | tech = NFC_DIGITAL_RF_TECH_106B; | |
594 | break; | |
595 | case TRF79070A_NFC_TARGET_PROTOCOL_212F: | |
596 | tech = NFC_DIGITAL_RF_TECH_212F; | |
597 | break; | |
598 | case TRF79070A_NFC_TARGET_PROTOCOL_424F: | |
599 | tech = NFC_DIGITAL_RF_TECH_424F; | |
600 | break; | |
601 | default: | |
602 | dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n", | |
603 | __func__, target_proto); | |
604 | return -EIO; | |
605 | } | |
606 | ||
607 | *rf_tech = tech; | |
608 | ||
609 | return ret; | |
610 | } | |
611 | ||
165063f1 MG |
612 | static void trf7970a_send_upstream(struct trf7970a *trf) |
613 | { | |
165063f1 MG |
614 | dev_kfree_skb_any(trf->tx_skb); |
615 | trf->tx_skb = NULL; | |
616 | ||
617 | if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting) | |
618 | print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE, | |
619 | 16, 1, trf->rx_skb->data, trf->rx_skb->len, | |
620 | false); | |
621 | ||
165063f1 MG |
622 | trf->state = TRF7970A_ST_IDLE; |
623 | ||
624 | if (trf->aborting) { | |
625 | dev_dbg(trf->dev, "Abort process complete\n"); | |
626 | ||
627 | if (!IS_ERR(trf->rx_skb)) { | |
628 | kfree_skb(trf->rx_skb); | |
629 | trf->rx_skb = ERR_PTR(-ECANCELED); | |
630 | } | |
631 | ||
632 | trf->aborting = false; | |
633 | } | |
634 | ||
ab714817 | 635 | if (trf->adjust_resp_len) { |
aaee24ac MG |
636 | if (trf->rx_skb) |
637 | skb_trim(trf->rx_skb, trf->rx_skb->len - 1); | |
638 | ||
ab714817 MG |
639 | trf->adjust_resp_len = false; |
640 | } | |
641 | ||
165063f1 MG |
642 | trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb); |
643 | ||
644 | trf->rx_skb = NULL; | |
645 | } | |
646 | ||
647 | static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno) | |
648 | { | |
649 | dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno); | |
650 | ||
6fb9edcb MG |
651 | cancel_delayed_work(&trf->timeout_work); |
652 | ||
165063f1 MG |
653 | kfree_skb(trf->rx_skb); |
654 | trf->rx_skb = ERR_PTR(errno); | |
655 | ||
656 | trf7970a_send_upstream(trf); | |
657 | } | |
658 | ||
659 | static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb, | |
7a1e5552 | 660 | unsigned int len, u8 *prefix, unsigned int prefix_len) |
165063f1 | 661 | { |
7a1e5552 MG |
662 | struct spi_transfer t[2]; |
663 | struct spi_message m; | |
165063f1 MG |
664 | unsigned int timeout; |
665 | int ret; | |
666 | ||
667 | print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE, | |
668 | 16, 1, skb->data, len, false); | |
669 | ||
7a1e5552 MG |
670 | spi_message_init(&m); |
671 | ||
672 | memset(&t, 0, sizeof(t)); | |
673 | ||
674 | t[0].tx_buf = prefix; | |
675 | t[0].len = prefix_len; | |
676 | spi_message_add_tail(&t[0], &m); | |
677 | ||
678 | t[1].tx_buf = skb->data; | |
679 | t[1].len = len; | |
680 | spi_message_add_tail(&t[1], &m); | |
681 | ||
682 | ret = spi_sync(trf->spi, &m); | |
165063f1 MG |
683 | if (ret) { |
684 | dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__, | |
685 | ret); | |
686 | return ret; | |
687 | } | |
688 | ||
689 | skb_pull(skb, len); | |
690 | ||
691 | if (skb->len > 0) { | |
692 | trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO; | |
693 | timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT; | |
694 | } else { | |
9d9304b3 MG |
695 | if (trf->issue_eof) { |
696 | trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF; | |
697 | timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF; | |
698 | } else { | |
699 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; | |
1961843c MG |
700 | |
701 | if (!trf->timeout) | |
702 | timeout = TRF7970A_WAIT_FOR_TX_IRQ; | |
703 | else | |
704 | timeout = trf->timeout; | |
9d9304b3 | 705 | } |
165063f1 MG |
706 | } |
707 | ||
708 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout, | |
709 | trf->state); | |
710 | ||
711 | schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | static void trf7970a_fill_fifo(struct trf7970a *trf) | |
717 | { | |
718 | struct sk_buff *skb = trf->tx_skb; | |
719 | unsigned int len; | |
720 | int ret; | |
721 | u8 fifo_bytes; | |
7a1e5552 | 722 | u8 prefix; |
165063f1 MG |
723 | |
724 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
725 | if (ret) { | |
726 | trf7970a_send_err_upstream(trf, ret); | |
727 | return; | |
728 | } | |
729 | ||
730 | dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes); | |
731 | ||
4542e834 | 732 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
165063f1 MG |
733 | |
734 | /* Calculate how much more data can be written to the fifo */ | |
735 | len = TRF7970A_FIFO_SIZE - fifo_bytes; | |
0e840ed5 MG |
736 | if (!len) { |
737 | schedule_delayed_work(&trf->timeout_work, | |
738 | msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT)); | |
739 | return; | |
740 | } | |
741 | ||
165063f1 MG |
742 | len = min(skb->len, len); |
743 | ||
7a1e5552 MG |
744 | prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER; |
745 | ||
746 | ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix)); | |
165063f1 MG |
747 | if (ret) |
748 | trf7970a_send_err_upstream(trf, ret); | |
749 | } | |
750 | ||
751 | static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status) | |
752 | { | |
753 | struct sk_buff *skb = trf->rx_skb; | |
754 | int ret; | |
755 | u8 fifo_bytes; | |
756 | ||
757 | if (status & TRF7970A_IRQ_STATUS_ERROR) { | |
758 | trf7970a_send_err_upstream(trf, -EIO); | |
759 | return; | |
760 | } | |
761 | ||
762 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
763 | if (ret) { | |
764 | trf7970a_send_err_upstream(trf, ret); | |
765 | return; | |
766 | } | |
767 | ||
768 | dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes); | |
769 | ||
4542e834 MG |
770 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; |
771 | ||
165063f1 MG |
772 | if (!fifo_bytes) |
773 | goto no_rx_data; | |
774 | ||
165063f1 MG |
775 | if (fifo_bytes > skb_tailroom(skb)) { |
776 | skb = skb_copy_expand(skb, skb_headroom(skb), | |
777 | max_t(int, fifo_bytes, | |
778 | TRF7970A_RX_SKB_ALLOC_SIZE), | |
779 | GFP_KERNEL); | |
780 | if (!skb) { | |
781 | trf7970a_send_err_upstream(trf, -ENOMEM); | |
782 | return; | |
783 | } | |
784 | ||
785 | kfree_skb(trf->rx_skb); | |
786 | trf->rx_skb = skb; | |
787 | } | |
788 | ||
789 | ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER, | |
790 | skb_put(skb, fifo_bytes), fifo_bytes); | |
791 | if (ret) { | |
792 | trf7970a_send_err_upstream(trf, ret); | |
793 | return; | |
794 | } | |
795 | ||
796 | /* If received Type 2 ACK/NACK, shift right 4 bits and pass up */ | |
797 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) && | |
798 | (trf->special_fcn_reg1 == | |
799 | TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) { | |
800 | skb->data[0] >>= 4; | |
801 | status = TRF7970A_IRQ_STATUS_SRX; | |
802 | } else { | |
803 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT; | |
5d8f7594 MG |
804 | |
805 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes); | |
806 | if (ret) { | |
807 | trf7970a_send_err_upstream(trf, ret); | |
808 | return; | |
809 | } | |
810 | ||
811 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; | |
812 | ||
813 | /* If there are bytes in the FIFO, set status to '0' so | |
814 | * the if stmt below doesn't fire and the driver will wait | |
815 | * for the trf7970a to generate another RX interrupt. | |
816 | */ | |
817 | if (fifo_bytes) | |
818 | status = 0; | |
165063f1 MG |
819 | } |
820 | ||
821 | no_rx_data: | |
822 | if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */ | |
823 | trf7970a_send_upstream(trf); | |
824 | return; | |
825 | } | |
826 | ||
827 | dev_dbg(trf->dev, "Setting timeout for %d ms\n", | |
828 | TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT); | |
829 | ||
830 | schedule_delayed_work(&trf->timeout_work, | |
831 | msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT)); | |
832 | } | |
833 | ||
834 | static irqreturn_t trf7970a_irq(int irq, void *dev_id) | |
835 | { | |
836 | struct trf7970a *trf = dev_id; | |
837 | int ret; | |
13b4272a | 838 | u8 status, fifo_bytes, iso_ctrl; |
165063f1 MG |
839 | |
840 | mutex_lock(&trf->lock); | |
841 | ||
b5e17d9b | 842 | if (trf->state == TRF7970A_ST_RF_OFF) { |
165063f1 MG |
843 | mutex_unlock(&trf->lock); |
844 | return IRQ_NONE; | |
845 | } | |
846 | ||
847 | ret = trf7970a_read_irqstatus(trf, &status); | |
848 | if (ret) { | |
849 | mutex_unlock(&trf->lock); | |
850 | return IRQ_NONE; | |
851 | } | |
852 | ||
853 | dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state, | |
854 | status); | |
855 | ||
856 | if (!status) { | |
857 | mutex_unlock(&trf->lock); | |
858 | return IRQ_NONE; | |
859 | } | |
860 | ||
861 | switch (trf->state) { | |
862 | case TRF7970A_ST_IDLE: | |
863 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
13b4272a MG |
864 | /* If initiator and getting interrupts caused by RF noise, |
865 | * turn off the receiver to avoid unnecessary interrupts. | |
866 | * It will be turned back on in trf7970a_send_cmd() when | |
867 | * the next command is issued. | |
165063f1 | 868 | */ |
13b4272a | 869 | if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) { |
165063f1 MG |
870 | trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX); |
871 | trf->state = TRF7970A_ST_IDLE_RX_BLOCKED; | |
872 | } | |
873 | ||
874 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
875 | break; | |
876 | case TRF7970A_ST_WAIT_FOR_TX_FIFO: | |
877 | if (status & TRF7970A_IRQ_STATUS_TX) { | |
878 | trf->ignore_timeout = | |
879 | !cancel_delayed_work(&trf->timeout_work); | |
880 | trf7970a_fill_fifo(trf); | |
881 | } else { | |
882 | trf7970a_send_err_upstream(trf, -EIO); | |
883 | } | |
884 | break; | |
885 | case TRF7970A_ST_WAIT_FOR_RX_DATA: | |
886 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
887 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
888 | trf->ignore_timeout = | |
889 | !cancel_delayed_work(&trf->timeout_work); | |
890 | trf7970a_drain_fifo(trf, status); | |
bece3c54 MG |
891 | } else if (status & TRF7970A_IRQ_STATUS_FIFO) { |
892 | ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, | |
893 | &fifo_bytes); | |
894 | ||
895 | fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW; | |
896 | ||
897 | if (ret) | |
898 | trf7970a_send_err_upstream(trf, ret); | |
899 | else if (!fifo_bytes) | |
900 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
13b4272a MG |
901 | } else if ((status == TRF7970A_IRQ_STATUS_TX) || |
902 | (!trf->is_initiator && | |
903 | (status == (TRF7970A_IRQ_STATUS_TX | | |
904 | TRF7970A_IRQ_STATUS_NFC_RF)))) { | |
4dd836e4 | 905 | trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); |
1961843c MG |
906 | |
907 | if (!trf->timeout) { | |
908 | trf->ignore_timeout = !cancel_delayed_work( | |
909 | &trf->timeout_work); | |
910 | trf->rx_skb = ERR_PTR(0); | |
911 | trf7970a_send_upstream(trf); | |
912 | break; | |
913 | } | |
13b4272a MG |
914 | |
915 | if (trf->is_initiator) | |
916 | break; | |
917 | ||
918 | iso_ctrl = trf->iso_ctrl; | |
919 | ||
920 | switch (trf->framing) { | |
921 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
922 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
923 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; | |
924 | trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ | |
925 | break; | |
926 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
927 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
928 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; | |
929 | trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */ | |
930 | break; | |
931 | case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: | |
932 | ret = trf7970a_write(trf, | |
933 | TRF7970A_SPECIAL_FCN_REG1, | |
934 | TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL); | |
935 | if (ret) | |
b9e3016a | 936 | goto err_unlock_exit; |
13b4272a MG |
937 | |
938 | trf->special_fcn_reg1 = | |
939 | TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL; | |
940 | break; | |
941 | default: | |
942 | break; | |
943 | } | |
944 | ||
945 | if (iso_ctrl != trf->iso_ctrl) { | |
946 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, | |
947 | iso_ctrl); | |
948 | if (ret) | |
b9e3016a | 949 | goto err_unlock_exit; |
13b4272a MG |
950 | |
951 | trf->iso_ctrl = iso_ctrl; | |
952 | } | |
4dd836e4 | 953 | } else { |
165063f1 MG |
954 | trf7970a_send_err_upstream(trf, -EIO); |
955 | } | |
956 | break; | |
9d9304b3 MG |
957 | case TRF7970A_ST_WAIT_TO_ISSUE_EOF: |
958 | if (status != TRF7970A_IRQ_STATUS_TX) | |
959 | trf7970a_send_err_upstream(trf, -EIO); | |
960 | break; | |
13b4272a MG |
961 | case TRF7970A_ST_LISTENING: |
962 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
963 | trf->ignore_timeout = | |
964 | !cancel_delayed_work(&trf->timeout_work); | |
965 | trf7970a_drain_fifo(trf, status); | |
966 | } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { | |
967 | trf7970a_send_err_upstream(trf, -EIO); | |
968 | } | |
969 | break; | |
cb174aba MG |
970 | case TRF7970A_ST_LISTENING_MD: |
971 | if (status & TRF7970A_IRQ_STATUS_SRX) { | |
972 | trf->ignore_timeout = | |
973 | !cancel_delayed_work(&trf->timeout_work); | |
974 | ||
975 | ret = trf7970a_mode_detect(trf, &trf->md_rf_tech); | |
976 | if (ret) { | |
977 | trf7970a_send_err_upstream(trf, ret); | |
978 | } else { | |
979 | trf->state = TRF7970A_ST_LISTENING; | |
980 | trf7970a_drain_fifo(trf, status); | |
981 | } | |
982 | } else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) { | |
983 | trf7970a_send_err_upstream(trf, -EIO); | |
984 | } | |
985 | break; | |
165063f1 MG |
986 | default: |
987 | dev_err(trf->dev, "%s - Driver in invalid state: %d\n", | |
988 | __func__, trf->state); | |
989 | } | |
990 | ||
b9e3016a | 991 | err_unlock_exit: |
165063f1 MG |
992 | mutex_unlock(&trf->lock); |
993 | return IRQ_HANDLED; | |
994 | } | |
995 | ||
9d9304b3 MG |
996 | static void trf7970a_issue_eof(struct trf7970a *trf) |
997 | { | |
998 | int ret; | |
999 | ||
1000 | dev_dbg(trf->dev, "Issuing EOF\n"); | |
1001 | ||
1002 | ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET); | |
1003 | if (ret) | |
1004 | trf7970a_send_err_upstream(trf, ret); | |
1005 | ||
1006 | ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF); | |
1007 | if (ret) | |
1008 | trf7970a_send_err_upstream(trf, ret); | |
1009 | ||
1010 | trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA; | |
1011 | ||
1012 | dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", | |
1013 | trf->timeout, trf->state); | |
1014 | ||
1015 | schedule_delayed_work(&trf->timeout_work, | |
1016 | msecs_to_jiffies(trf->timeout)); | |
1017 | } | |
1018 | ||
165063f1 MG |
1019 | static void trf7970a_timeout_work_handler(struct work_struct *work) |
1020 | { | |
1021 | struct trf7970a *trf = container_of(work, struct trf7970a, | |
1022 | timeout_work.work); | |
1023 | ||
1024 | dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n", | |
1025 | trf->state, trf->ignore_timeout); | |
1026 | ||
1027 | mutex_lock(&trf->lock); | |
1028 | ||
1029 | if (trf->ignore_timeout) | |
1030 | trf->ignore_timeout = false; | |
1031 | else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT) | |
afa5b5f1 | 1032 | trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX); |
9d9304b3 MG |
1033 | else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF) |
1034 | trf7970a_issue_eof(trf); | |
165063f1 MG |
1035 | else |
1036 | trf7970a_send_err_upstream(trf, -ETIMEDOUT); | |
1037 | ||
1038 | mutex_unlock(&trf->lock); | |
1039 | } | |
1040 | ||
1041 | static int trf7970a_init(struct trf7970a *trf) | |
1042 | { | |
1043 | int ret; | |
1044 | ||
1045 | dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state); | |
1046 | ||
1047 | ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT); | |
1048 | if (ret) | |
1049 | goto err_out; | |
1050 | ||
1051 | ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE); | |
1052 | if (ret) | |
1053 | goto err_out; | |
1054 | ||
49d22c70 GL |
1055 | ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, |
1056 | trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); | |
1057 | if (ret) | |
1058 | goto err_out; | |
1059 | ||
58d46f53 GL |
1060 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); |
1061 | if (ret) | |
1062 | goto err_out; | |
1063 | ||
4e007f81 MG |
1064 | usleep_range(1000, 2000); |
1065 | ||
7149d6bf MG |
1066 | trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
1067 | ||
837eb4d2 GL |
1068 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, |
1069 | trf->modulator_sys_clk_ctrl); | |
6c08df42 MG |
1070 | if (ret) |
1071 | goto err_out; | |
1072 | ||
165063f1 MG |
1073 | ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS, |
1074 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 | | |
1075 | TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32); | |
1076 | if (ret) | |
1077 | goto err_out; | |
1078 | ||
1079 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0); | |
1080 | if (ret) | |
1081 | goto err_out; | |
1082 | ||
1083 | trf->special_fcn_reg1 = 0; | |
1084 | ||
49d19cc7 | 1085 | trf->iso_ctrl = 0xff; |
165063f1 MG |
1086 | return 0; |
1087 | ||
1088 | err_out: | |
1089 | dev_dbg(trf->dev, "Couldn't init device: %d\n", ret); | |
1090 | return ret; | |
1091 | } | |
1092 | ||
1093 | static void trf7970a_switch_rf_off(struct trf7970a *trf) | |
1094 | { | |
cfc708db MG |
1095 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
1096 | (trf->state == TRF7970A_ST_RF_OFF)) | |
1097 | return; | |
1098 | ||
165063f1 MG |
1099 | dev_dbg(trf->dev, "Switching rf off\n"); |
1100 | ||
a1d2dc5b MG |
1101 | trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON; |
1102 | ||
1103 | trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl); | |
1104 | ||
165063f1 | 1105 | trf->aborting = false; |
b5e17d9b | 1106 | trf->state = TRF7970A_ST_RF_OFF; |
e6403b7c MG |
1107 | |
1108 | pm_runtime_mark_last_busy(trf->dev); | |
1109 | pm_runtime_put_autosuspend(trf->dev); | |
165063f1 MG |
1110 | } |
1111 | ||
0a1de842 | 1112 | static int trf7970a_switch_rf_on(struct trf7970a *trf) |
165063f1 | 1113 | { |
a08e5454 MG |
1114 | int ret; |
1115 | ||
165063f1 MG |
1116 | dev_dbg(trf->dev, "Switching rf on\n"); |
1117 | ||
e6403b7c | 1118 | pm_runtime_get_sync(trf->dev); |
165063f1 | 1119 | |
ceccd6aa MG |
1120 | if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */ |
1121 | dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__, | |
1122 | trf->state); | |
1123 | return -EINVAL; | |
1124 | } | |
1125 | ||
a08e5454 MG |
1126 | ret = trf7970a_init(trf); |
1127 | if (ret) { | |
1128 | dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret); | |
0a1de842 | 1129 | return ret; |
a08e5454 MG |
1130 | } |
1131 | ||
e6403b7c | 1132 | trf->state = TRF7970A_ST_IDLE; |
0a1de842 MG |
1133 | |
1134 | return 0; | |
165063f1 MG |
1135 | } |
1136 | ||
1137 | static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on) | |
1138 | { | |
1139 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
0a1de842 | 1140 | int ret = 0; |
165063f1 MG |
1141 | |
1142 | dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on); | |
1143 | ||
1144 | mutex_lock(&trf->lock); | |
1145 | ||
1146 | if (on) { | |
1147 | switch (trf->state) { | |
ceccd6aa | 1148 | case TRF7970A_ST_PWR_OFF: |
b5e17d9b | 1149 | case TRF7970A_ST_RF_OFF: |
0a1de842 | 1150 | ret = trf7970a_switch_rf_on(trf); |
165063f1 MG |
1151 | break; |
1152 | case TRF7970A_ST_IDLE: | |
1153 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
1154 | break; | |
1155 | default: | |
1156 | dev_err(trf->dev, "%s - Invalid request: %d %d\n", | |
1157 | __func__, trf->state, on); | |
1158 | trf7970a_switch_rf_off(trf); | |
0a1de842 | 1159 | ret = -EINVAL; |
165063f1 MG |
1160 | } |
1161 | } else { | |
1162 | switch (trf->state) { | |
ceccd6aa | 1163 | case TRF7970A_ST_PWR_OFF: |
b5e17d9b | 1164 | case TRF7970A_ST_RF_OFF: |
165063f1 MG |
1165 | break; |
1166 | default: | |
1167 | dev_err(trf->dev, "%s - Invalid request: %d %d\n", | |
1168 | __func__, trf->state, on); | |
0a1de842 | 1169 | ret = -EINVAL; |
165063f1 MG |
1170 | /* FALLTHROUGH */ |
1171 | case TRF7970A_ST_IDLE: | |
1172 | case TRF7970A_ST_IDLE_RX_BLOCKED: | |
13b4272a MG |
1173 | case TRF7970A_ST_WAIT_FOR_RX_DATA: |
1174 | case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT: | |
165063f1 MG |
1175 | trf7970a_switch_rf_off(trf); |
1176 | } | |
1177 | } | |
1178 | ||
1179 | mutex_unlock(&trf->lock); | |
0a1de842 | 1180 | return ret; |
165063f1 MG |
1181 | } |
1182 | ||
307e5caf | 1183 | static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech) |
165063f1 MG |
1184 | { |
1185 | int ret = 0; | |
1186 | ||
1187 | dev_dbg(trf->dev, "rf technology: %d\n", tech); | |
1188 | ||
1189 | switch (tech) { | |
1190 | case NFC_DIGITAL_RF_TECH_106A: | |
49d19cc7 | 1191 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; |
837eb4d2 GL |
1192 | trf->modulator_sys_clk_ctrl = |
1193 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1194 | TRF7970A_MODULATOR_DEPTH_OOK; | |
4e64eff8 | 1195 | trf->guard_time = TRF7970A_GUARD_TIME_NFCA; |
165063f1 | 1196 | break; |
742b1f9f MG |
1197 | case NFC_DIGITAL_RF_TECH_106B: |
1198 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106; | |
837eb4d2 GL |
1199 | trf->modulator_sys_clk_ctrl = |
1200 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1201 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
4e64eff8 | 1202 | trf->guard_time = TRF7970A_GUARD_TIME_NFCB; |
742b1f9f | 1203 | break; |
6857bb96 MG |
1204 | case NFC_DIGITAL_RF_TECH_212F: |
1205 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212; | |
837eb4d2 GL |
1206 | trf->modulator_sys_clk_ctrl = |
1207 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1208 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
4e64eff8 | 1209 | trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
6857bb96 MG |
1210 | break; |
1211 | case NFC_DIGITAL_RF_TECH_424F: | |
1212 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424; | |
837eb4d2 GL |
1213 | trf->modulator_sys_clk_ctrl = |
1214 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1215 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
4e64eff8 | 1216 | trf->guard_time = TRF7970A_GUARD_TIME_NFCF; |
6857bb96 | 1217 | break; |
9d9304b3 | 1218 | case NFC_DIGITAL_RF_TECH_ISO15693: |
49d19cc7 | 1219 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; |
837eb4d2 GL |
1220 | trf->modulator_sys_clk_ctrl = |
1221 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1222 | TRF7970A_MODULATOR_DEPTH_OOK; | |
4e64eff8 | 1223 | trf->guard_time = TRF7970A_GUARD_TIME_15693; |
9d9304b3 | 1224 | break; |
165063f1 MG |
1225 | default: |
1226 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | ||
1230 | trf->technology = tech; | |
1231 | ||
13b4272a MG |
1232 | /* If in initiator mode and not changing the RF tech due to a |
1233 | * PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from | |
1234 | * trf7970a_init()), clear the NFC Target Detection Level register | |
1235 | * due to erratum. | |
1236 | */ | |
1237 | if (trf->iso_ctrl == 0xff) | |
1238 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); | |
1239 | ||
165063f1 MG |
1240 | return ret; |
1241 | } | |
1242 | ||
851ee3cb MG |
1243 | static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field) |
1244 | { | |
1245 | int ret; | |
1246 | u8 rssi; | |
1247 | ||
1248 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
1249 | trf->chip_status_ctrl | TRF7970A_CHIP_STATUS_REC_ON); | |
1250 | if (ret) | |
1251 | return ret; | |
1252 | ||
1253 | ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF); | |
1254 | if (ret) | |
1255 | return ret; | |
1256 | ||
1257 | usleep_range(50, 60); | |
1258 | ||
1259 | ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi); | |
1260 | if (ret) | |
1261 | return ret; | |
1262 | ||
1263 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
1264 | trf->chip_status_ctrl); | |
1265 | if (ret) | |
1266 | return ret; | |
1267 | ||
1268 | if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK) | |
1269 | *is_rf_field = true; | |
1270 | else | |
1271 | *is_rf_field = false; | |
1272 | ||
1273 | return 0; | |
1274 | } | |
1275 | ||
307e5caf | 1276 | static int trf7970a_in_config_framing(struct trf7970a *trf, int framing) |
165063f1 | 1277 | { |
49d19cc7 | 1278 | u8 iso_ctrl = trf->iso_ctrl_tech; |
851ee3cb | 1279 | bool is_rf_field = false; |
49d19cc7 MG |
1280 | int ret; |
1281 | ||
165063f1 MG |
1282 | dev_dbg(trf->dev, "framing: %d\n", framing); |
1283 | ||
1284 | switch (framing) { | |
1285 | case NFC_DIGITAL_FRAMING_NFCA_SHORT: | |
1286 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
1287 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
49d19cc7 | 1288 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
1289 | break; |
1290 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
80062891 | 1291 | case NFC_DIGITAL_FRAMING_NFCA_T4T: |
742b1f9f MG |
1292 | case NFC_DIGITAL_FRAMING_NFCB: |
1293 | case NFC_DIGITAL_FRAMING_NFCB_T4T: | |
6857bb96 MG |
1294 | case NFC_DIGITAL_FRAMING_NFCF: |
1295 | case NFC_DIGITAL_FRAMING_NFCF_T3T: | |
9d9304b3 MG |
1296 | case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY: |
1297 | case NFC_DIGITAL_FRAMING_ISO15693_T5T: | |
13b4272a MG |
1298 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: |
1299 | case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: | |
165063f1 | 1300 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; |
49d19cc7 | 1301 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
1302 | break; |
1303 | case NFC_DIGITAL_FRAMING_NFCA_T2T: | |
1304 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
49d19cc7 | 1305 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; |
165063f1 MG |
1306 | break; |
1307 | default: | |
1308 | dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); | |
1309 | return -EINVAL; | |
1310 | } | |
1311 | ||
1312 | trf->framing = framing; | |
1313 | ||
851ee3cb MG |
1314 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1315 | ret = trf7970a_is_rf_field(trf, &is_rf_field); | |
1316 | if (ret) | |
1317 | return ret; | |
1318 | ||
1319 | if (is_rf_field) | |
1320 | return -EBUSY; | |
1321 | } | |
1322 | ||
49d19cc7 MG |
1323 | if (iso_ctrl != trf->iso_ctrl) { |
1324 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1325 | if (ret) | |
1326 | return ret; | |
1327 | ||
1328 | trf->iso_ctrl = iso_ctrl; | |
a0822a7e MG |
1329 | |
1330 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, | |
12e9ade3 | 1331 | trf->modulator_sys_clk_ctrl); |
a0822a7e MG |
1332 | if (ret) |
1333 | return ret; | |
49d19cc7 MG |
1334 | } |
1335 | ||
a1d2dc5b MG |
1336 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { |
1337 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
1338 | trf->chip_status_ctrl | | |
1339 | TRF7970A_CHIP_STATUS_RF_ON); | |
1340 | if (ret) | |
1341 | return ret; | |
1342 | ||
1343 | trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; | |
1344 | ||
4e64eff8 | 1345 | usleep_range(trf->guard_time, trf->guard_time + 1000); |
a1d2dc5b MG |
1346 | } |
1347 | ||
49d19cc7 | 1348 | return 0; |
165063f1 MG |
1349 | } |
1350 | ||
1351 | static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type, | |
1352 | int param) | |
1353 | { | |
1354 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
18422e68 | 1355 | int ret; |
165063f1 MG |
1356 | |
1357 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); | |
1358 | ||
1359 | mutex_lock(&trf->lock); | |
1360 | ||
13b4272a MG |
1361 | trf->is_initiator = true; |
1362 | ||
ceccd6aa MG |
1363 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
1364 | (trf->state == TRF7970A_ST_RF_OFF)) { | |
0a1de842 MG |
1365 | ret = trf7970a_switch_rf_on(trf); |
1366 | if (ret) | |
1367 | goto err_unlock; | |
1368 | } | |
165063f1 MG |
1369 | |
1370 | switch (type) { | |
1371 | case NFC_DIGITAL_CONFIG_RF_TECH: | |
307e5caf | 1372 | ret = trf7970a_in_config_rf_tech(trf, param); |
165063f1 MG |
1373 | break; |
1374 | case NFC_DIGITAL_CONFIG_FRAMING: | |
307e5caf | 1375 | ret = trf7970a_in_config_framing(trf, param); |
165063f1 MG |
1376 | break; |
1377 | default: | |
1378 | dev_dbg(trf->dev, "Unknown type: %d\n", type); | |
1379 | ret = -EINVAL; | |
1380 | } | |
1381 | ||
0a1de842 | 1382 | err_unlock: |
165063f1 MG |
1383 | mutex_unlock(&trf->lock); |
1384 | return ret; | |
1385 | } | |
1386 | ||
9d9304b3 MG |
1387 | static int trf7970a_is_iso15693_write_or_lock(u8 cmd) |
1388 | { | |
1389 | switch (cmd) { | |
1390 | case ISO15693_CMD_WRITE_SINGLE_BLOCK: | |
1391 | case ISO15693_CMD_LOCK_BLOCK: | |
1392 | case ISO15693_CMD_WRITE_MULTIPLE_BLOCK: | |
1393 | case ISO15693_CMD_WRITE_AFI: | |
1394 | case ISO15693_CMD_LOCK_AFI: | |
1395 | case ISO15693_CMD_WRITE_DSFID: | |
1396 | case ISO15693_CMD_LOCK_DSFID: | |
1397 | return 1; | |
1398 | break; | |
1399 | default: | |
1400 | return 0; | |
1401 | } | |
1402 | } | |
1403 | ||
165063f1 MG |
1404 | static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb) |
1405 | { | |
1406 | u8 *req = skb->data; | |
9d9304b3 | 1407 | u8 special_fcn_reg1, iso_ctrl; |
165063f1 MG |
1408 | int ret; |
1409 | ||
9d9304b3 MG |
1410 | trf->issue_eof = false; |
1411 | ||
165063f1 MG |
1412 | /* When issuing Type 2 read command, make sure the '4_bit_RX' bit in |
1413 | * special functions register 1 is cleared; otherwise, its a write or | |
1414 | * sector select command and '4_bit_RX' must be set. | |
9d9304b3 MG |
1415 | * |
1416 | * When issuing an ISO 15693 command, inspect the flags byte to see | |
1417 | * what speed to use. Also, remember if the OPTION flag is set on | |
1418 | * a Type 5 write or lock command so the driver will know that it | |
1419 | * has to send an EOF in order to get a response. | |
165063f1 MG |
1420 | */ |
1421 | if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) && | |
1422 | (trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) { | |
1423 | if (req[0] == NFC_T2T_CMD_READ) | |
1424 | special_fcn_reg1 = 0; | |
1425 | else | |
1426 | special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX; | |
1427 | ||
1428 | if (special_fcn_reg1 != trf->special_fcn_reg1) { | |
1429 | ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, | |
1430 | special_fcn_reg1); | |
1431 | if (ret) | |
1432 | return ret; | |
1433 | ||
1434 | trf->special_fcn_reg1 = special_fcn_reg1; | |
1435 | } | |
9d9304b3 MG |
1436 | } else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) { |
1437 | iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK; | |
1438 | ||
1439 | switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) { | |
1440 | case 0x00: | |
1441 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662; | |
1442 | break; | |
1443 | case ISO15693_REQ_FLAG_SUB_CARRIER: | |
1444 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a; | |
1445 | break; | |
1446 | case ISO15693_REQ_FLAG_DATA_RATE: | |
1447 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; | |
1448 | break; | |
1449 | case (ISO15693_REQ_FLAG_SUB_CARRIER | | |
1450 | ISO15693_REQ_FLAG_DATA_RATE): | |
1451 | iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669; | |
1452 | break; | |
1453 | } | |
1454 | ||
1455 | if (iso_ctrl != trf->iso_ctrl) { | |
1456 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1457 | if (ret) | |
1458 | return ret; | |
1459 | ||
1460 | trf->iso_ctrl = iso_ctrl; | |
1461 | } | |
1462 | ||
ab714817 MG |
1463 | if (trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) { |
1464 | if (trf7970a_is_iso15693_write_or_lock(req[1]) && | |
1465 | (req[0] & ISO15693_REQ_FLAG_OPTION)) | |
1466 | trf->issue_eof = true; | |
1467 | else if ((trf->quirks & | |
1468 | TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE) && | |
1469 | (req[1] == ISO15693_CMD_READ_MULTIPLE_BLOCK)) | |
1470 | trf->adjust_resp_len = true; | |
1471 | } | |
165063f1 MG |
1472 | } |
1473 | ||
1474 | return 0; | |
1475 | } | |
1476 | ||
13b4272a | 1477 | static int trf7970a_send_cmd(struct nfc_digital_dev *ddev, |
165063f1 MG |
1478 | struct sk_buff *skb, u16 timeout, |
1479 | nfc_digital_cmd_complete_t cb, void *arg) | |
1480 | { | |
1481 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
7a1e5552 | 1482 | u8 prefix[5]; |
165063f1 MG |
1483 | unsigned int len; |
1484 | int ret; | |
aff0564a | 1485 | u8 status; |
165063f1 MG |
1486 | |
1487 | dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n", | |
1488 | trf->state, timeout, skb->len); | |
1489 | ||
1490 | if (skb->len > TRF7970A_TX_MAX) | |
1491 | return -EINVAL; | |
1492 | ||
1493 | mutex_lock(&trf->lock); | |
1494 | ||
1495 | if ((trf->state != TRF7970A_ST_IDLE) && | |
1496 | (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { | |
1497 | dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, | |
1498 | trf->state); | |
1499 | ret = -EIO; | |
1500 | goto out_err; | |
1501 | } | |
1502 | ||
1503 | if (trf->aborting) { | |
1504 | dev_dbg(trf->dev, "Abort process complete\n"); | |
1505 | trf->aborting = false; | |
1506 | ret = -ECANCELED; | |
1507 | goto out_err; | |
1508 | } | |
1509 | ||
1961843c MG |
1510 | if (timeout) { |
1511 | trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, | |
1512 | GFP_KERNEL); | |
1513 | if (!trf->rx_skb) { | |
1514 | dev_dbg(trf->dev, "Can't alloc rx_skb\n"); | |
1515 | ret = -ENOMEM; | |
1516 | goto out_err; | |
1517 | } | |
165063f1 MG |
1518 | } |
1519 | ||
1520 | if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) { | |
1521 | ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); | |
1522 | if (ret) | |
1523 | goto out_err; | |
1524 | ||
1525 | trf->state = TRF7970A_ST_IDLE; | |
1526 | } | |
1527 | ||
13b4272a MG |
1528 | if (trf->is_initiator) { |
1529 | ret = trf7970a_per_cmd_config(trf, skb); | |
1530 | if (ret) | |
1531 | goto out_err; | |
1532 | } | |
165063f1 MG |
1533 | |
1534 | trf->ddev = ddev; | |
1535 | trf->tx_skb = skb; | |
1536 | trf->cb = cb; | |
1537 | trf->cb_arg = arg; | |
1538 | trf->timeout = timeout; | |
1539 | trf->ignore_timeout = false; | |
1540 | ||
1541 | len = skb->len; | |
165063f1 MG |
1542 | |
1543 | /* TX data must be prefixed with a FIFO reset cmd, a cmd that depends | |
1544 | * on what the current framing is, the address of the TX length byte 1 | |
1545 | * register (0x1d), and the 2 byte length of the data to be transmitted. | |
7a1e5552 | 1546 | * That totals 5 bytes. |
165063f1 MG |
1547 | */ |
1548 | prefix[0] = TRF7970A_CMD_BIT_CTRL | | |
1549 | TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET); | |
1550 | prefix[1] = TRF7970A_CMD_BIT_CTRL | | |
1551 | TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd); | |
1552 | prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1; | |
1553 | ||
1554 | if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) { | |
1555 | prefix[3] = 0x00; | |
1556 | prefix[4] = 0x0f; /* 7 bits */ | |
1557 | } else { | |
1558 | prefix[3] = (len & 0xf00) >> 4; | |
1559 | prefix[3] |= ((len & 0xf0) >> 4); | |
1560 | prefix[4] = ((len & 0x0f) << 4); | |
1561 | } | |
1562 | ||
1563 | len = min_t(int, skb->len, TRF7970A_FIFO_SIZE); | |
1564 | ||
aff0564a MG |
1565 | /* Clear possible spurious interrupt */ |
1566 | ret = trf7970a_read_irqstatus(trf, &status); | |
1567 | if (ret) | |
1568 | goto out_err; | |
1569 | ||
7a1e5552 | 1570 | ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix)); |
165063f1 MG |
1571 | if (ret) { |
1572 | kfree_skb(trf->rx_skb); | |
1573 | trf->rx_skb = NULL; | |
1574 | } | |
1575 | ||
1576 | out_err: | |
1577 | mutex_unlock(&trf->lock); | |
1578 | return ret; | |
1579 | } | |
1580 | ||
13b4272a | 1581 | static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech) |
165063f1 | 1582 | { |
13b4272a MG |
1583 | int ret = 0; |
1584 | ||
1585 | dev_dbg(trf->dev, "rf technology: %d\n", tech); | |
1586 | ||
1587 | switch (tech) { | |
1588 | case NFC_DIGITAL_RF_TECH_106A: | |
1589 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | | |
1590 | TRF7970A_ISO_CTRL_NFC_CE | | |
1591 | TRF7970A_ISO_CTRL_NFC_CE_14443A; | |
837eb4d2 GL |
1592 | trf->modulator_sys_clk_ctrl = |
1593 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1594 | TRF7970A_MODULATOR_DEPTH_OOK; | |
13b4272a MG |
1595 | break; |
1596 | case NFC_DIGITAL_RF_TECH_212F: | |
1597 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | | |
1598 | TRF7970A_ISO_CTRL_NFC_NFCF_212; | |
837eb4d2 GL |
1599 | trf->modulator_sys_clk_ctrl = |
1600 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1601 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
13b4272a MG |
1602 | break; |
1603 | case NFC_DIGITAL_RF_TECH_424F: | |
1604 | trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE | | |
1605 | TRF7970A_ISO_CTRL_NFC_NFCF_424; | |
837eb4d2 GL |
1606 | trf->modulator_sys_clk_ctrl = |
1607 | (trf->modulator_sys_clk_ctrl & 0xf8) | | |
1608 | TRF7970A_MODULATOR_DEPTH_ASK10; | |
13b4272a MG |
1609 | break; |
1610 | default: | |
1611 | dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); | |
1612 | return -EINVAL; | |
1613 | } | |
1614 | ||
1615 | trf->technology = tech; | |
165063f1 | 1616 | |
13b4272a MG |
1617 | /* Normally we write the ISO_CTRL register in |
1618 | * trf7970a_tg_config_framing() because the framing can change | |
1619 | * the value written. However, when sending a PSL RES, | |
1620 | * digital_tg_send_psl_res_complete() doesn't call | |
1621 | * trf7970a_tg_config_framing() so we must write the register | |
1622 | * here. | |
1623 | */ | |
1624 | if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) && | |
1625 | (trf->iso_ctrl_tech != trf->iso_ctrl)) { | |
1626 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, | |
1627 | trf->iso_ctrl_tech); | |
1628 | ||
1629 | trf->iso_ctrl = trf->iso_ctrl_tech; | |
1630 | } | |
165063f1 | 1631 | |
13b4272a | 1632 | return ret; |
165063f1 MG |
1633 | } |
1634 | ||
13b4272a MG |
1635 | /* Since this is a target routine, several of the framing calls are |
1636 | * made between receiving the request and sending the response so they | |
1637 | * should take effect until after the response is sent. This is accomplished | |
1638 | * by skipping the ISO_CTRL register write here and doing it in the interrupt | |
1639 | * handler. | |
1640 | */ | |
1641 | static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing) | |
1642 | { | |
1643 | u8 iso_ctrl = trf->iso_ctrl_tech; | |
1644 | int ret; | |
1645 | ||
1646 | dev_dbg(trf->dev, "framing: %d\n", framing); | |
1647 | ||
1648 | switch (framing) { | |
1649 | case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP: | |
1650 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC; | |
1651 | iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N; | |
1652 | break; | |
1653 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD: | |
1654 | case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A: | |
1655 | case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE: | |
1656 | /* These ones are applied in the interrupt handler */ | |
1657 | iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */ | |
1658 | break; | |
1659 | case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP: | |
1660 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
1661 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; | |
1662 | break; | |
1663 | case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED: | |
1664 | trf->tx_cmd = TRF7970A_CMD_TRANSMIT; | |
1665 | iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N; | |
1666 | break; | |
1667 | default: | |
1668 | dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing); | |
1669 | return -EINVAL; | |
1670 | } | |
1671 | ||
1672 | trf->framing = framing; | |
1673 | ||
1674 | if (iso_ctrl != trf->iso_ctrl) { | |
1675 | ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl); | |
1676 | if (ret) | |
1677 | return ret; | |
1678 | ||
1679 | trf->iso_ctrl = iso_ctrl; | |
1680 | ||
1681 | ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, | |
1682 | trf->modulator_sys_clk_ctrl); | |
1683 | if (ret) | |
1684 | return ret; | |
1685 | } | |
1686 | ||
1687 | if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) { | |
1688 | ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, | |
1689 | trf->chip_status_ctrl | | |
1690 | TRF7970A_CHIP_STATUS_RF_ON); | |
1691 | if (ret) | |
1692 | return ret; | |
1693 | ||
1694 | trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON; | |
1695 | } | |
1696 | ||
1697 | return 0; | |
1698 | } | |
1699 | ||
1700 | static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type, | |
1701 | int param) | |
165063f1 MG |
1702 | { |
1703 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
13b4272a MG |
1704 | int ret; |
1705 | ||
1706 | dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param); | |
1707 | ||
1708 | mutex_lock(&trf->lock); | |
1709 | ||
1710 | trf->is_initiator = false; | |
165063f1 | 1711 | |
13b4272a MG |
1712 | if ((trf->state == TRF7970A_ST_PWR_OFF) || |
1713 | (trf->state == TRF7970A_ST_RF_OFF)) { | |
1714 | ret = trf7970a_switch_rf_on(trf); | |
1715 | if (ret) | |
1716 | goto err_unlock; | |
1717 | } | |
1718 | ||
1719 | switch (type) { | |
1720 | case NFC_DIGITAL_CONFIG_RF_TECH: | |
1721 | ret = trf7970a_tg_config_rf_tech(trf, param); | |
1722 | break; | |
1723 | case NFC_DIGITAL_CONFIG_FRAMING: | |
1724 | ret = trf7970a_tg_config_framing(trf, param); | |
1725 | break; | |
1726 | default: | |
1727 | dev_dbg(trf->dev, "Unknown type: %d\n", type); | |
1728 | ret = -EINVAL; | |
1729 | } | |
165063f1 | 1730 | |
13b4272a MG |
1731 | err_unlock: |
1732 | mutex_unlock(&trf->lock); | |
1733 | return ret; | |
165063f1 MG |
1734 | } |
1735 | ||
cb174aba MG |
1736 | static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
1737 | nfc_digital_cmd_complete_t cb, void *arg, bool mode_detect) | |
165063f1 MG |
1738 | { |
1739 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
13b4272a MG |
1740 | int ret; |
1741 | ||
13b4272a | 1742 | mutex_lock(&trf->lock); |
165063f1 | 1743 | |
13b4272a MG |
1744 | if ((trf->state != TRF7970A_ST_IDLE) && |
1745 | (trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) { | |
1746 | dev_err(trf->dev, "%s - Bogus state: %d\n", __func__, | |
1747 | trf->state); | |
1748 | ret = -EIO; | |
1749 | goto out_err; | |
1750 | } | |
1751 | ||
1752 | if (trf->aborting) { | |
1753 | dev_dbg(trf->dev, "Abort process complete\n"); | |
1754 | trf->aborting = false; | |
1755 | ret = -ECANCELED; | |
1756 | goto out_err; | |
1757 | } | |
1758 | ||
1759 | trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE, | |
1760 | GFP_KERNEL); | |
1761 | if (!trf->rx_skb) { | |
1762 | dev_dbg(trf->dev, "Can't alloc rx_skb\n"); | |
1763 | ret = -ENOMEM; | |
1764 | goto out_err; | |
1765 | } | |
1766 | ||
1767 | ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS, | |
1768 | TRF7970A_RX_SPECIAL_SETTINGS_HBT | | |
1769 | TRF7970A_RX_SPECIAL_SETTINGS_M848 | | |
1770 | TRF7970A_RX_SPECIAL_SETTINGS_C424 | | |
1771 | TRF7970A_RX_SPECIAL_SETTINGS_C212); | |
1772 | if (ret) | |
fc0ae243 | 1773 | goto out_err; |
13b4272a MG |
1774 | |
1775 | ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, | |
49d22c70 | 1776 | trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); |
13b4272a | 1777 | if (ret) |
fc0ae243 | 1778 | goto out_err; |
165063f1 | 1779 | |
13b4272a MG |
1780 | ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL, |
1781 | TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3)); | |
1782 | if (ret) | |
fc0ae243 | 1783 | goto out_err; |
13b4272a MG |
1784 | |
1785 | ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, | |
1786 | TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7)); | |
1787 | if (ret) | |
fc0ae243 | 1788 | goto out_err; |
13b4272a MG |
1789 | |
1790 | trf->ddev = ddev; | |
1791 | trf->cb = cb; | |
1792 | trf->cb_arg = arg; | |
1793 | trf->timeout = timeout; | |
1794 | trf->ignore_timeout = false; | |
1795 | ||
1796 | ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX); | |
1797 | if (ret) | |
1798 | goto out_err; | |
1799 | ||
cb174aba MG |
1800 | trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD : |
1801 | TRF7970A_ST_LISTENING; | |
13b4272a MG |
1802 | |
1803 | schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout)); | |
1804 | ||
1805 | out_err: | |
1806 | mutex_unlock(&trf->lock); | |
1807 | return ret; | |
165063f1 MG |
1808 | } |
1809 | ||
cb174aba MG |
1810 | static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, |
1811 | nfc_digital_cmd_complete_t cb, void *arg) | |
1812 | { | |
1813 | struct trf7970a *trf = nfc_digital_get_drvdata(ddev); | |
1814 | ||
1815 | dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n", | |
1816 | trf->state, timeout); | |
1817 | ||
1818 | return _trf7970a_tg_listen(ddev, timeout, cb, arg, false); | |
1819 | } | |
1820 | ||
1821 | static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev, | |
1822 | u16 timeout, nfc_digital_cmd_complete_t cb, void *arg) | |
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", | |
1828 | trf->state, timeout); | |
1829 | ||
1830 | ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
1831 | NFC_DIGITAL_RF_TECH_106A); | |
1832 | if (ret) | |
1833 | return ret; | |
1834 | ||
1835 | ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
1836 | NFC_DIGITAL_FRAMING_NFCA_NFC_DEP); | |
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", | |
1848 | trf->state, trf->md_rf_tech); | |
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 | ||
1911 | if (!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) { | |
ce69b95c GB |
1912 | if (gpio_is_valid(trf->en2_gpio)) { |
1913 | gpio_set_value(trf->en2_gpio, 1); | |
1914 | usleep_range(1000, 2000); | |
1915 | } | |
ceccd6aa MG |
1916 | } |
1917 | ||
1918 | gpio_set_value(trf->en_gpio, 1); | |
1919 | ||
1920 | usleep_range(20000, 21000); | |
1921 | ||
1922 | trf->state = TRF7970A_ST_RF_OFF; | |
1923 | ||
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | static int trf7970a_power_down(struct trf7970a *trf) | |
1928 | { | |
1929 | int ret; | |
1930 | ||
1931 | dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state); | |
1932 | ||
1933 | if (trf->state == TRF7970A_ST_PWR_OFF) | |
1934 | return 0; | |
1935 | ||
1936 | if (trf->state != TRF7970A_ST_RF_OFF) { | |
1937 | dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n", | |
1938 | trf->state); | |
1939 | return -EBUSY; | |
1940 | } | |
1941 | ||
1942 | gpio_set_value(trf->en_gpio, 0); | |
ce69b95c GB |
1943 | if (gpio_is_valid(trf->en2_gpio)) |
1944 | gpio_set_value(trf->en2_gpio, 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__, | |
1949 | ret); | |
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 | ||
3bd14233 MG |
2006 | static int trf7970a_get_vin_voltage_override(struct device_node *np, |
2007 | u32 *vin_uvolts) | |
2008 | { | |
2009 | return of_property_read_u32(np, "vin-voltage-override", vin_uvolts); | |
2010 | } | |
2011 | ||
165063f1 MG |
2012 | static int trf7970a_probe(struct spi_device *spi) |
2013 | { | |
2014 | struct device_node *np = spi->dev.of_node; | |
165063f1 | 2015 | struct trf7970a *trf; |
fd0c8280 | 2016 | int uvolts, autosuspend_delay, ret; |
837eb4d2 | 2017 | u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY; |
165063f1 MG |
2018 | |
2019 | if (!np) { | |
2020 | dev_err(&spi->dev, "No Device Tree entry\n"); | |
2021 | return -EINVAL; | |
2022 | } | |
2023 | ||
2024 | trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL); | |
2025 | if (!trf) | |
2026 | return -ENOMEM; | |
2027 | ||
ceccd6aa | 2028 | trf->state = TRF7970A_ST_PWR_OFF; |
165063f1 MG |
2029 | trf->dev = &spi->dev; |
2030 | trf->spi = spi; | |
165063f1 MG |
2031 | |
2032 | spi->mode = SPI_MODE_1; | |
2033 | spi->bits_per_word = 8; | |
2034 | ||
24707296 MG |
2035 | ret = spi_setup(spi); |
2036 | if (ret < 0) { | |
2037 | dev_err(trf->dev, "Can't set up SPI Communication\n"); | |
2038 | return ret; | |
2039 | } | |
2040 | ||
ab714817 MG |
2041 | if (of_property_read_bool(np, "t5t-rmb-extra-byte-quirk")) |
2042 | trf->quirks |= TRF7970A_QUIRK_T5T_RMB_EXTRA_BYTE; | |
2043 | ||
772079eb MG |
2044 | if (of_property_read_bool(np, "irq-status-read-quirk")) |
2045 | trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ; | |
2046 | ||
165063f1 MG |
2047 | /* There are two enable pins - both must be present */ |
2048 | trf->en_gpio = of_get_named_gpio(np, "ti,enable-gpios", 0); | |
2049 | if (!gpio_is_valid(trf->en_gpio)) { | |
2050 | dev_err(trf->dev, "No EN GPIO property\n"); | |
2051 | return trf->en_gpio; | |
2052 | } | |
2053 | ||
2054 | ret = devm_gpio_request_one(trf->dev, trf->en_gpio, | |
f23b7352 | 2055 | GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN"); |
165063f1 MG |
2056 | if (ret) { |
2057 | dev_err(trf->dev, "Can't request EN GPIO: %d\n", ret); | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | trf->en2_gpio = of_get_named_gpio(np, "ti,enable-gpios", 1); | |
2062 | if (!gpio_is_valid(trf->en2_gpio)) { | |
ce69b95c GB |
2063 | dev_info(trf->dev, "No EN2 GPIO property\n"); |
2064 | } else { | |
2065 | ret = devm_gpio_request_one(trf->dev, trf->en2_gpio, | |
2066 | GPIOF_DIR_OUT | GPIOF_INIT_LOW, "trf7970a EN2"); | |
2067 | if (ret) { | |
2068 | dev_err(trf->dev, "Can't request EN2 GPIO: %d\n", ret); | |
2069 | return ret; | |
2070 | } | |
165063f1 MG |
2071 | } |
2072 | ||
837eb4d2 GL |
2073 | of_property_read_u32(np, "clock-frequency", &clk_freq); |
2074 | if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) || | |
2075 | (clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) { | |
2076 | dev_err(trf->dev, | |
2077 | "clock-frequency (%u Hz) unsupported\n", | |
2078 | clk_freq); | |
2079 | return -EINVAL; | |
2080 | } | |
2081 | ||
95064bd9 MG |
2082 | if (of_property_read_bool(np, "en2-rf-quirk")) |
2083 | trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW; | |
2084 | ||
165063f1 MG |
2085 | ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL, |
2086 | trf7970a_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
2087 | "trf7970a", trf); | |
2088 | if (ret) { | |
2089 | dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret); | |
2090 | return ret; | |
2091 | } | |
2092 | ||
2093 | mutex_init(&trf->lock); | |
2094 | INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler); | |
2095 | ||
2096 | trf->regulator = devm_regulator_get(&spi->dev, "vin"); | |
2097 | if (IS_ERR(trf->regulator)) { | |
2098 | ret = PTR_ERR(trf->regulator); | |
2099 | dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret); | |
2100 | goto err_destroy_lock; | |
2101 | } | |
2102 | ||
2103 | ret = regulator_enable(trf->regulator); | |
2104 | if (ret) { | |
2105 | dev_err(trf->dev, "Can't enable VIN: %d\n", ret); | |
2106 | goto err_destroy_lock; | |
2107 | } | |
2108 | ||
3bd14233 MG |
2109 | ret = trf7970a_get_vin_voltage_override(np, &uvolts); |
2110 | if (ret) | |
2111 | uvolts = regulator_get_voltage(trf->regulator); | |
ebcc5a0d MG |
2112 | |
2113 | if (uvolts > 4000000) | |
2114 | trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; | |
2115 | ||
49d22c70 GL |
2116 | trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); |
2117 | if (IS_ERR(trf->regulator)) { | |
2118 | ret = PTR_ERR(trf->regulator); | |
2119 | dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); | |
2120 | goto err_destroy_lock; | |
2121 | } | |
2122 | ||
2123 | ret = regulator_enable(trf->regulator); | |
2124 | if (ret) { | |
2125 | dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); | |
2126 | goto err_destroy_lock; | |
2127 | } | |
2128 | ||
2129 | if (regulator_get_voltage(trf->regulator) == 1800000) { | |
2130 | trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; | |
2131 | dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); | |
2132 | } | |
2133 | ||
165063f1 MG |
2134 | trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, |
2135 | TRF7970A_SUPPORTED_PROTOCOLS, | |
13b4272a MG |
2136 | NFC_DIGITAL_DRV_CAPS_IN_CRC | |
2137 | NFC_DIGITAL_DRV_CAPS_TG_CRC, 0, 0); | |
165063f1 MG |
2138 | if (!trf->ddev) { |
2139 | dev_err(trf->dev, "Can't allocate NFC digital device\n"); | |
2140 | ret = -ENOMEM; | |
2141 | goto err_disable_regulator; | |
2142 | } | |
2143 | ||
2144 | nfc_digital_set_parent_dev(trf->ddev, trf->dev); | |
2145 | nfc_digital_set_drvdata(trf->ddev, trf); | |
2146 | spi_set_drvdata(spi, trf); | |
2147 | ||
fd0c8280 MG |
2148 | autosuspend_delay = trf7970a_get_autosuspend_delay(np); |
2149 | ||
2150 | pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay); | |
e6403b7c | 2151 | pm_runtime_use_autosuspend(trf->dev); |
ceccd6aa | 2152 | |
b528281b | 2153 | ret = trf7970a_startup(trf); |
ceccd6aa MG |
2154 | if (ret) |
2155 | goto err_free_ddev; | |
2156 | ||
165063f1 MG |
2157 | ret = nfc_digital_register_device(trf->ddev); |
2158 | if (ret) { | |
2159 | dev_err(trf->dev, "Can't register NFC digital device: %d\n", | |
2160 | ret); | |
b528281b | 2161 | goto err_shutdown; |
165063f1 MG |
2162 | } |
2163 | ||
2164 | return 0; | |
2165 | ||
b528281b MG |
2166 | err_shutdown: |
2167 | trf7970a_shutdown(trf); | |
ceccd6aa | 2168 | err_free_ddev: |
165063f1 MG |
2169 | nfc_digital_free_device(trf->ddev); |
2170 | err_disable_regulator: | |
2171 | regulator_disable(trf->regulator); | |
2172 | err_destroy_lock: | |
2173 | mutex_destroy(&trf->lock); | |
2174 | return ret; | |
2175 | } | |
2176 | ||
2177 | static int trf7970a_remove(struct spi_device *spi) | |
2178 | { | |
2179 | struct trf7970a *trf = spi_get_drvdata(spi); | |
2180 | ||
2181 | mutex_lock(&trf->lock); | |
2182 | ||
b528281b | 2183 | trf7970a_shutdown(trf); |
ceccd6aa MG |
2184 | |
2185 | mutex_unlock(&trf->lock); | |
e6403b7c | 2186 | |
165063f1 MG |
2187 | nfc_digital_unregister_device(trf->ddev); |
2188 | nfc_digital_free_device(trf->ddev); | |
2189 | ||
2190 | regulator_disable(trf->regulator); | |
2191 | ||
2192 | mutex_destroy(&trf->lock); | |
2193 | ||
2194 | return 0; | |
2195 | } | |
2196 | ||
77c9539d MG |
2197 | #ifdef CONFIG_PM_SLEEP |
2198 | static int trf7970a_suspend(struct device *dev) | |
2199 | { | |
88e2ce01 | 2200 | struct spi_device *spi = to_spi_device(dev); |
77c9539d | 2201 | struct trf7970a *trf = spi_get_drvdata(spi); |
77c9539d MG |
2202 | |
2203 | dev_dbg(dev, "Suspend\n"); | |
2204 | ||
2205 | mutex_lock(&trf->lock); | |
2206 | ||
2207 | trf7970a_shutdown(trf); | |
2208 | ||
2209 | mutex_unlock(&trf->lock); | |
2210 | ||
671970f5 | 2211 | return 0; |
77c9539d MG |
2212 | } |
2213 | ||
2214 | static int trf7970a_resume(struct device *dev) | |
2215 | { | |
88e2ce01 | 2216 | struct spi_device *spi = to_spi_device(dev); |
77c9539d | 2217 | struct trf7970a *trf = spi_get_drvdata(spi); |
55ef2e75 | 2218 | int ret; |
77c9539d MG |
2219 | |
2220 | dev_dbg(dev, "Resume\n"); | |
2221 | ||
2222 | mutex_lock(&trf->lock); | |
2223 | ||
2224 | ret = trf7970a_startup(trf); | |
2225 | ||
2226 | mutex_unlock(&trf->lock); | |
2227 | ||
2228 | return ret; | |
2229 | } | |
2230 | #endif | |
2231 | ||
e8a9235c | 2232 | #ifdef CONFIG_PM |
e6403b7c MG |
2233 | static int trf7970a_pm_runtime_suspend(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 suspend\n"); | |
2240 | ||
ceccd6aa | 2241 | mutex_lock(&trf->lock); |
e6403b7c | 2242 | |
ceccd6aa | 2243 | ret = trf7970a_power_down(trf); |
e6403b7c | 2244 | |
ceccd6aa | 2245 | mutex_unlock(&trf->lock); |
e6403b7c MG |
2246 | |
2247 | return ret; | |
2248 | } | |
2249 | ||
2250 | static int trf7970a_pm_runtime_resume(struct device *dev) | |
2251 | { | |
88e2ce01 | 2252 | struct spi_device *spi = to_spi_device(dev); |
e6403b7c MG |
2253 | struct trf7970a *trf = spi_get_drvdata(spi); |
2254 | int ret; | |
2255 | ||
2256 | dev_dbg(dev, "Runtime resume\n"); | |
2257 | ||
ceccd6aa MG |
2258 | ret = trf7970a_power_up(trf); |
2259 | if (!ret) | |
2260 | pm_runtime_mark_last_busy(dev); | |
e6403b7c | 2261 | |
ceccd6aa | 2262 | return ret; |
e6403b7c MG |
2263 | } |
2264 | #endif | |
2265 | ||
2266 | static const struct dev_pm_ops trf7970a_pm_ops = { | |
77c9539d | 2267 | SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume) |
e6403b7c MG |
2268 | SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend, |
2269 | trf7970a_pm_runtime_resume, NULL) | |
2270 | }; | |
2271 | ||
3c39c1a5 JMC |
2272 | static const struct of_device_id trf7970a_of_match[] = { |
2273 | { .compatible = "ti,trf7970a", }, | |
2274 | { /* sentinel */ }, | |
2275 | }; | |
2276 | MODULE_DEVICE_TABLE(of, trf7970a_of_match); | |
2277 | ||
165063f1 | 2278 | static const struct spi_device_id trf7970a_id_table[] = { |
772079eb | 2279 | { "trf7970a", 0 }, |
165063f1 MG |
2280 | { } |
2281 | }; | |
2282 | MODULE_DEVICE_TABLE(spi, trf7970a_id_table); | |
2283 | ||
2284 | static struct spi_driver trf7970a_spi_driver = { | |
2285 | .probe = trf7970a_probe, | |
2286 | .remove = trf7970a_remove, | |
2287 | .id_table = trf7970a_id_table, | |
2288 | .driver = { | |
2289 | .name = "trf7970a", | |
3c39c1a5 | 2290 | .of_match_table = of_match_ptr(trf7970a_of_match), |
e6403b7c | 2291 | .pm = &trf7970a_pm_ops, |
165063f1 MG |
2292 | }, |
2293 | }; | |
2294 | ||
2295 | module_spi_driver(trf7970a_spi_driver); | |
2296 | ||
2297 | MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>"); | |
2298 | MODULE_LICENSE("GPL v2"); | |
2299 | MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver"); |