1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2016-2017 Google, Inc
4 *
5 * Fairchild FUSB302 Type-C Chip Driver
6 */
7
8 #include <linux/debugfs.h>
9 #include <linux/delay.h>
10 #include <linux/errno.h>
11 #include <linux/extcon.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/i2c.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/of_device.h>
19 #include <linux/pinctrl/consumer.h>
20 #include <linux/proc_fs.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/sched/clock.h>
23 #include <linux/seq_file.h>
24 #include <linux/slab.h>
25 #include <linux/spinlock.h>
26 #include <linux/string.h>
27 #include <linux/types.h>
28 #include <linux/usb.h>
29 #include <linux/usb/typec.h>
30 #include <linux/usb/tcpm.h>
31 #include <linux/usb/pd.h>
32 #include <linux/workqueue.h>
33
34 #include "fusb302_reg.h"
35
36 /*
37 * When the device is SNK, BC_LVL interrupt is used to monitor cc pins
38 * for the current capability offered by the SRC. As FUSB302 chip fires
39 * the BC_LVL interrupt on PD signalings, cc lvl should be handled after
40 * a delay to avoid measuring on PD activities. The delay is slightly
41 * longer than PD_T_PD_DEBPUNCE (10-20ms).
42 */
43 #define T_BC_LVL_DEBOUNCE_DELAY_MS 30
44
45 enum toggling_mode {
46 TOGGLING_MODE_OFF,
47 TOGGLING_MODE_DRP,
48 TOGGLING_MODE_SNK,
49 TOGGLING_MODE_SRC,
50 };
51
52 enum src_current_status {
53 SRC_CURRENT_DEFAULT,
54 SRC_CURRENT_MEDIUM,
55 SRC_CURRENT_HIGH,
56 };
57
58 static const u8 ra_mda_value[] = {
59 [SRC_CURRENT_DEFAULT] = 4, /* 210mV */
60 [SRC_CURRENT_MEDIUM] = 9, /* 420mV */
61 [SRC_CURRENT_HIGH] = 18, /* 798mV */
62 };
63
64 static const u8 rd_mda_value[] = {
65 [SRC_CURRENT_DEFAULT] = 38, /* 1638mV */
66 [SRC_CURRENT_MEDIUM] = 38, /* 1638mV */
67 [SRC_CURRENT_HIGH] = 61, /* 2604mV */
68 };
69
70 #define LOG_BUFFER_ENTRIES 1024
71 #define LOG_BUFFER_ENTRY_SIZE 128
72
73 struct fusb302_chip {
74 struct device *dev;
75 struct i2c_client *i2c_client;
76 struct tcpm_port *tcpm_port;
77 struct tcpc_dev tcpc_dev;
78
79 struct regulator *vbus;
80
81 spinlock_t irq_lock;
82 struct work_struct irq_work;
83 bool irq_suspended;
84 bool irq_while_suspended;
85 struct gpio_desc *gpio_int_n;
86 int gpio_int_n_irq;
87 struct extcon_dev *extcon;
88
89 struct workqueue_struct *wq;
90 struct delayed_work bc_lvl_handler;
91
92 /* lock for sharing chip states */
93 struct mutex lock;
94
95 /* chip status */
96 enum toggling_mode toggling_mode;
97 enum src_current_status src_current_status;
98 bool intr_togdone;
99 bool intr_bc_lvl;
100 bool intr_comp_chng;
101
102 /* port status */
103 bool vconn_on;
104 bool vbus_on;
105 bool charge_on;
106 bool vbus_present;
107 enum typec_cc_polarity cc_polarity;
108 enum typec_cc_status cc1;
109 enum typec_cc_status cc2;
110 u32 snk_pdo[PDO_MAX_OBJECTS];
111
112 #ifdef CONFIG_DEBUG_FS
113 struct dentry *dentry;
114 /* lock for log buffer access */
115 struct mutex logbuffer_lock;
116 int logbuffer_head;
117 int logbuffer_tail;
118 u8 *logbuffer[LOG_BUFFER_ENTRIES];
119 #endif
120 };
121
122 /*
123 * Logging
124 */
125
126 #ifdef CONFIG_DEBUG_FS
fusb302_log_full(struct fusb302_chip * chip)127 static bool fusb302_log_full(struct fusb302_chip *chip)
128 {
129 return chip->logbuffer_tail ==
130 (chip->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
131 }
132
133 __printf(2, 0)
_fusb302_log(struct fusb302_chip * chip,const char * fmt,va_list args)134 static void _fusb302_log(struct fusb302_chip *chip, const char *fmt,
135 va_list args)
136 {
137 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
138 u64 ts_nsec = local_clock();
139 unsigned long rem_nsec;
140
141 if (!chip->logbuffer[chip->logbuffer_head]) {
142 chip->logbuffer[chip->logbuffer_head] =
143 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
144 if (!chip->logbuffer[chip->logbuffer_head])
145 return;
146 }
147
148 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
149
150 mutex_lock(&chip->logbuffer_lock);
151
152 if (fusb302_log_full(chip)) {
153 chip->logbuffer_head = max(chip->logbuffer_head - 1, 0);
154 strlcpy(tmpbuffer, "overflow", sizeof(tmpbuffer));
155 }
156
157 if (chip->logbuffer_head < 0 ||
158 chip->logbuffer_head >= LOG_BUFFER_ENTRIES) {
159 dev_warn(chip->dev,
160 "Bad log buffer index %d\n", chip->logbuffer_head);
161 goto abort;
162 }
163
164 if (!chip->logbuffer[chip->logbuffer_head]) {
165 dev_warn(chip->dev,
166 "Log buffer index %d is NULL\n", chip->logbuffer_head);
167 goto abort;
168 }
169
170 rem_nsec = do_div(ts_nsec, 1000000000);
171 scnprintf(chip->logbuffer[chip->logbuffer_head],
172 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
173 (unsigned long)ts_nsec, rem_nsec / 1000,
174 tmpbuffer);
175 chip->logbuffer_head = (chip->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
176
177 abort:
178 mutex_unlock(&chip->logbuffer_lock);
179 }
180
181 __printf(2, 3)
fusb302_log(struct fusb302_chip * chip,const char * fmt,...)182 static void fusb302_log(struct fusb302_chip *chip, const char *fmt, ...)
183 {
184 va_list args;
185
186 va_start(args, fmt);
187 _fusb302_log(chip, fmt, args);
188 va_end(args);
189 }
190
fusb302_debug_show(struct seq_file * s,void * v)191 static int fusb302_debug_show(struct seq_file *s, void *v)
192 {
193 struct fusb302_chip *chip = (struct fusb302_chip *)s->private;
194 int tail;
195
196 mutex_lock(&chip->logbuffer_lock);
197 tail = chip->logbuffer_tail;
198 while (tail != chip->logbuffer_head) {
199 seq_printf(s, "%s\n", chip->logbuffer[tail]);
200 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
201 }
202 if (!seq_has_overflowed(s))
203 chip->logbuffer_tail = tail;
204 mutex_unlock(&chip->logbuffer_lock);
205
206 return 0;
207 }
208 DEFINE_SHOW_ATTRIBUTE(fusb302_debug);
209
fusb302_debugfs_init(struct fusb302_chip * chip)210 static void fusb302_debugfs_init(struct fusb302_chip *chip)
211 {
212 char name[NAME_MAX];
213
214 mutex_init(&chip->logbuffer_lock);
215 snprintf(name, NAME_MAX, "fusb302-%s", dev_name(chip->dev));
216 chip->dentry = debugfs_create_dir(name, usb_debug_root);
217 debugfs_create_file("log", S_IFREG | 0444, chip->dentry, chip,
218 &fusb302_debug_fops);
219 }
220
fusb302_debugfs_exit(struct fusb302_chip * chip)221 static void fusb302_debugfs_exit(struct fusb302_chip *chip)
222 {
223 debugfs_remove(chip->dentry);
224 }
225
226 #else
227
fusb302_log(const struct fusb302_chip * chip,const char * fmt,...)228 static void fusb302_log(const struct fusb302_chip *chip,
229 const char *fmt, ...) { }
fusb302_debugfs_init(const struct fusb302_chip * chip)230 static void fusb302_debugfs_init(const struct fusb302_chip *chip) { }
fusb302_debugfs_exit(const struct fusb302_chip * chip)231 static void fusb302_debugfs_exit(const struct fusb302_chip *chip) { }
232
233 #endif
234
fusb302_i2c_write(struct fusb302_chip * chip,u8 address,u8 data)235 static int fusb302_i2c_write(struct fusb302_chip *chip,
236 u8 address, u8 data)
237 {
238 int ret = 0;
239
240 ret = i2c_smbus_write_byte_data(chip->i2c_client, address, data);
241 if (ret < 0)
242 fusb302_log(chip, "cannot write 0x%02x to 0x%02x, ret=%d",
243 data, address, ret);
244
245 return ret;
246 }
247
fusb302_i2c_block_write(struct fusb302_chip * chip,u8 address,u8 length,const u8 * data)248 static int fusb302_i2c_block_write(struct fusb302_chip *chip, u8 address,
249 u8 length, const u8 *data)
250 {
251 int ret = 0;
252
253 if (length <= 0)
254 return ret;
255
256 ret = i2c_smbus_write_i2c_block_data(chip->i2c_client, address,
257 length, data);
258 if (ret < 0)
259 fusb302_log(chip, "cannot block write 0x%02x, len=%d, ret=%d",
260 address, length, ret);
261
262 return ret;
263 }
264
fusb302_i2c_read(struct fusb302_chip * chip,u8 address,u8 * data)265 static int fusb302_i2c_read(struct fusb302_chip *chip,
266 u8 address, u8 *data)
267 {
268 int ret = 0;
269
270 ret = i2c_smbus_read_byte_data(chip->i2c_client, address);
271 *data = (u8)ret;
272 if (ret < 0)
273 fusb302_log(chip, "cannot read %02x, ret=%d", address, ret);
274
275 return ret;
276 }
277
fusb302_i2c_block_read(struct fusb302_chip * chip,u8 address,u8 length,u8 * data)278 static int fusb302_i2c_block_read(struct fusb302_chip *chip, u8 address,
279 u8 length, u8 *data)
280 {
281 int ret = 0;
282
283 if (length <= 0)
284 return ret;
285
286 ret = i2c_smbus_read_i2c_block_data(chip->i2c_client, address,
287 length, data);
288 if (ret < 0) {
289 fusb302_log(chip, "cannot block read 0x%02x, len=%d, ret=%d",
290 address, length, ret);
291 goto done;
292 }
293 if (ret != length) {
294 fusb302_log(chip, "only read %d/%d bytes from 0x%02x",
295 ret, length, address);
296 ret = -EIO;
297 }
298
299 done:
300 return ret;
301 }
302
fusb302_i2c_mask_write(struct fusb302_chip * chip,u8 address,u8 mask,u8 value)303 static int fusb302_i2c_mask_write(struct fusb302_chip *chip, u8 address,
304 u8 mask, u8 value)
305 {
306 int ret = 0;
307 u8 data;
308
309 ret = fusb302_i2c_read(chip, address, &data);
310 if (ret < 0)
311 return ret;
312 data &= ~mask;
313 data |= value;
314 ret = fusb302_i2c_write(chip, address, data);
315 if (ret < 0)
316 return ret;
317
318 return ret;
319 }
320
fusb302_i2c_set_bits(struct fusb302_chip * chip,u8 address,u8 set_bits)321 static int fusb302_i2c_set_bits(struct fusb302_chip *chip, u8 address,
322 u8 set_bits)
323 {
324 return fusb302_i2c_mask_write(chip, address, 0x00, set_bits);
325 }
326
fusb302_i2c_clear_bits(struct fusb302_chip * chip,u8 address,u8 clear_bits)327 static int fusb302_i2c_clear_bits(struct fusb302_chip *chip, u8 address,
328 u8 clear_bits)
329 {
330 return fusb302_i2c_mask_write(chip, address, clear_bits, 0x00);
331 }
332
fusb302_sw_reset(struct fusb302_chip * chip)333 static int fusb302_sw_reset(struct fusb302_chip *chip)
334 {
335 int ret = 0;
336
337 ret = fusb302_i2c_write(chip, FUSB_REG_RESET,
338 FUSB_REG_RESET_SW_RESET);
339 if (ret < 0)
340 fusb302_log(chip, "cannot sw reset the chip, ret=%d", ret);
341 else
342 fusb302_log(chip, "sw reset");
343
344 return ret;
345 }
346
fusb302_enable_tx_auto_retries(struct fusb302_chip * chip,u8 retry_count)347 static int fusb302_enable_tx_auto_retries(struct fusb302_chip *chip, u8 retry_count)
348 {
349 int ret = 0;
350
351 ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3, retry_count |
352 FUSB_REG_CONTROL3_AUTO_RETRY);
353
354 return ret;
355 }
356
357 /*
358 * initialize interrupt on the chip
359 * - unmasked interrupt: VBUS_OK
360 */
fusb302_init_interrupt(struct fusb302_chip * chip)361 static int fusb302_init_interrupt(struct fusb302_chip *chip)
362 {
363 int ret = 0;
364
365 ret = fusb302_i2c_write(chip, FUSB_REG_MASK,
366 0xFF & ~FUSB_REG_MASK_VBUSOK);
367 if (ret < 0)
368 return ret;
369 ret = fusb302_i2c_write(chip, FUSB_REG_MASKA, 0xFF);
370 if (ret < 0)
371 return ret;
372 ret = fusb302_i2c_write(chip, FUSB_REG_MASKB, 0xFF);
373 if (ret < 0)
374 return ret;
375 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_CONTROL0,
376 FUSB_REG_CONTROL0_INT_MASK);
377 if (ret < 0)
378 return ret;
379
380 return ret;
381 }
382
fusb302_set_power_mode(struct fusb302_chip * chip,u8 power_mode)383 static int fusb302_set_power_mode(struct fusb302_chip *chip, u8 power_mode)
384 {
385 int ret = 0;
386
387 ret = fusb302_i2c_write(chip, FUSB_REG_POWER, power_mode);
388
389 return ret;
390 }
391
tcpm_init(struct tcpc_dev * dev)392 static int tcpm_init(struct tcpc_dev *dev)
393 {
394 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
395 tcpc_dev);
396 int ret = 0;
397 u8 data;
398
399 ret = fusb302_sw_reset(chip);
400 if (ret < 0)
401 return ret;
402 ret = fusb302_enable_tx_auto_retries(chip, FUSB_REG_CONTROL3_N_RETRIES_3);
403 if (ret < 0)
404 return ret;
405 ret = fusb302_init_interrupt(chip);
406 if (ret < 0)
407 return ret;
408 ret = fusb302_set_power_mode(chip, FUSB_REG_POWER_PWR_ALL);
409 if (ret < 0)
410 return ret;
411 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &data);
412 if (ret < 0)
413 return ret;
414 chip->vbus_present = !!(data & FUSB_REG_STATUS0_VBUSOK);
415 ret = fusb302_i2c_read(chip, FUSB_REG_DEVICE_ID, &data);
416 if (ret < 0)
417 return ret;
418 fusb302_log(chip, "fusb302 device ID: 0x%02x", data);
419
420 return ret;
421 }
422
tcpm_get_vbus(struct tcpc_dev * dev)423 static int tcpm_get_vbus(struct tcpc_dev *dev)
424 {
425 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
426 tcpc_dev);
427 int ret = 0;
428
429 mutex_lock(&chip->lock);
430 ret = chip->vbus_present ? 1 : 0;
431 mutex_unlock(&chip->lock);
432
433 return ret;
434 }
435
tcpm_get_current_limit(struct tcpc_dev * dev)436 static int tcpm_get_current_limit(struct tcpc_dev *dev)
437 {
438 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
439 tcpc_dev);
440 int current_limit = 0;
441 unsigned long timeout;
442
443 if (!chip->extcon)
444 return 0;
445
446 /*
447 * USB2 Charger detection may still be in progress when we get here,
448 * this can take upto 600ms, wait 800ms max.
449 */
450 timeout = jiffies + msecs_to_jiffies(800);
451 do {
452 if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_SDP) == 1)
453 current_limit = 500;
454
455 if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_CDP) == 1 ||
456 extcon_get_state(chip->extcon, EXTCON_CHG_USB_ACA) == 1)
457 current_limit = 1500;
458
459 if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_DCP) == 1)
460 current_limit = 2000;
461
462 msleep(50);
463 } while (current_limit == 0 && time_before(jiffies, timeout));
464
465 return current_limit;
466 }
467
fusb302_set_src_current(struct fusb302_chip * chip,enum src_current_status status)468 static int fusb302_set_src_current(struct fusb302_chip *chip,
469 enum src_current_status status)
470 {
471 int ret = 0;
472
473 chip->src_current_status = status;
474 switch (status) {
475 case SRC_CURRENT_DEFAULT:
476 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0,
477 FUSB_REG_CONTROL0_HOST_CUR_MASK,
478 FUSB_REG_CONTROL0_HOST_CUR_DEF);
479 break;
480 case SRC_CURRENT_MEDIUM:
481 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0,
482 FUSB_REG_CONTROL0_HOST_CUR_MASK,
483 FUSB_REG_CONTROL0_HOST_CUR_MED);
484 break;
485 case SRC_CURRENT_HIGH:
486 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0,
487 FUSB_REG_CONTROL0_HOST_CUR_MASK,
488 FUSB_REG_CONTROL0_HOST_CUR_HIGH);
489 break;
490 default:
491 break;
492 }
493
494 return ret;
495 }
496
fusb302_set_toggling(struct fusb302_chip * chip,enum toggling_mode mode)497 static int fusb302_set_toggling(struct fusb302_chip *chip,
498 enum toggling_mode mode)
499 {
500 int ret = 0;
501
502 /* first disable toggling */
503 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_CONTROL2,
504 FUSB_REG_CONTROL2_TOGGLE);
505 if (ret < 0)
506 return ret;
507 /* mask interrupts for SRC or SNK */
508 ret = fusb302_i2c_set_bits(chip, FUSB_REG_MASK,
509 FUSB_REG_MASK_BC_LVL |
510 FUSB_REG_MASK_COMP_CHNG);
511 if (ret < 0)
512 return ret;
513 chip->intr_bc_lvl = false;
514 chip->intr_comp_chng = false;
515 /* configure toggling mode: none/snk/src/drp */
516 switch (mode) {
517 case TOGGLING_MODE_OFF:
518 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
519 FUSB_REG_CONTROL2_MODE_MASK,
520 FUSB_REG_CONTROL2_MODE_NONE);
521 if (ret < 0)
522 return ret;
523 break;
524 case TOGGLING_MODE_SNK:
525 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
526 FUSB_REG_CONTROL2_MODE_MASK,
527 FUSB_REG_CONTROL2_MODE_UFP);
528 if (ret < 0)
529 return ret;
530 break;
531 case TOGGLING_MODE_SRC:
532 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
533 FUSB_REG_CONTROL2_MODE_MASK,
534 FUSB_REG_CONTROL2_MODE_DFP);
535 if (ret < 0)
536 return ret;
537 break;
538 case TOGGLING_MODE_DRP:
539 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
540 FUSB_REG_CONTROL2_MODE_MASK,
541 FUSB_REG_CONTROL2_MODE_DRP);
542 if (ret < 0)
543 return ret;
544 break;
545 default:
546 break;
547 }
548
549 if (mode == TOGGLING_MODE_OFF) {
550 /* mask TOGDONE interrupt */
551 ret = fusb302_i2c_set_bits(chip, FUSB_REG_MASKA,
552 FUSB_REG_MASKA_TOGDONE);
553 if (ret < 0)
554 return ret;
555 chip->intr_togdone = false;
556 } else {
557 /* Datasheet says vconn MUST be off when toggling */
558 WARN(chip->vconn_on, "Vconn is on during toggle start");
559 /* unmask TOGDONE interrupt */
560 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA,
561 FUSB_REG_MASKA_TOGDONE);
562 if (ret < 0)
563 return ret;
564 chip->intr_togdone = true;
565 /* start toggling */
566 ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL2,
567 FUSB_REG_CONTROL2_TOGGLE);
568 if (ret < 0)
569 return ret;
570 /* during toggling, consider cc as Open */
571 chip->cc1 = TYPEC_CC_OPEN;
572 chip->cc2 = TYPEC_CC_OPEN;
573 }
574 chip->toggling_mode = mode;
575
576 return ret;
577 }
578
579 static const char * const typec_cc_status_name[] = {
580 [TYPEC_CC_OPEN] = "Open",
581 [TYPEC_CC_RA] = "Ra",
582 [TYPEC_CC_RD] = "Rd",
583 [TYPEC_CC_RP_DEF] = "Rp-def",
584 [TYPEC_CC_RP_1_5] = "Rp-1.5",
585 [TYPEC_CC_RP_3_0] = "Rp-3.0",
586 };
587
588 static const enum src_current_status cc_src_current[] = {
589 [TYPEC_CC_OPEN] = SRC_CURRENT_DEFAULT,
590 [TYPEC_CC_RA] = SRC_CURRENT_DEFAULT,
591 [TYPEC_CC_RD] = SRC_CURRENT_DEFAULT,
592 [TYPEC_CC_RP_DEF] = SRC_CURRENT_DEFAULT,
593 [TYPEC_CC_RP_1_5] = SRC_CURRENT_MEDIUM,
594 [TYPEC_CC_RP_3_0] = SRC_CURRENT_HIGH,
595 };
596
tcpm_set_cc(struct tcpc_dev * dev,enum typec_cc_status cc)597 static int tcpm_set_cc(struct tcpc_dev *dev, enum typec_cc_status cc)
598 {
599 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
600 tcpc_dev);
601 u8 switches0_mask = FUSB_REG_SWITCHES0_CC1_PU_EN |
602 FUSB_REG_SWITCHES0_CC2_PU_EN |
603 FUSB_REG_SWITCHES0_CC1_PD_EN |
604 FUSB_REG_SWITCHES0_CC2_PD_EN;
605 u8 rd_mda, switches0_data = 0x00;
606 int ret = 0;
607
608 mutex_lock(&chip->lock);
609 switch (cc) {
610 case TYPEC_CC_OPEN:
611 break;
612 case TYPEC_CC_RD:
613 switches0_data |= FUSB_REG_SWITCHES0_CC1_PD_EN |
614 FUSB_REG_SWITCHES0_CC2_PD_EN;
615 break;
616 case TYPEC_CC_RP_DEF:
617 case TYPEC_CC_RP_1_5:
618 case TYPEC_CC_RP_3_0:
619 switches0_data |= (chip->cc_polarity == TYPEC_POLARITY_CC1) ?
620 FUSB_REG_SWITCHES0_CC1_PU_EN :
621 FUSB_REG_SWITCHES0_CC2_PU_EN;
622 break;
623 default:
624 fusb302_log(chip, "unsupported cc value %s",
625 typec_cc_status_name[cc]);
626 ret = -EINVAL;
627 goto done;
628 }
629
630 fusb302_log(chip, "cc := %s", typec_cc_status_name[cc]);
631
632 ret = fusb302_set_toggling(chip, TOGGLING_MODE_OFF);
633 if (ret < 0) {
634 fusb302_log(chip, "cannot set toggling mode, ret=%d", ret);
635 goto done;
636 }
637
638 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0,
639 switches0_mask, switches0_data);
640 if (ret < 0) {
641 fusb302_log(chip, "cannot set pull-up/-down, ret = %d", ret);
642 goto done;
643 }
644 /* reset the cc status */
645 chip->cc1 = TYPEC_CC_OPEN;
646 chip->cc2 = TYPEC_CC_OPEN;
647
648 /* adjust current for SRC */
649 ret = fusb302_set_src_current(chip, cc_src_current[cc]);
650 if (ret < 0) {
651 fusb302_log(chip, "cannot set src current %s, ret=%d",
652 typec_cc_status_name[cc], ret);
653 goto done;
654 }
655
656 /* enable/disable interrupts, BC_LVL for SNK and COMP_CHNG for SRC */
657 switch (cc) {
658 case TYPEC_CC_RP_DEF:
659 case TYPEC_CC_RP_1_5:
660 case TYPEC_CC_RP_3_0:
661 rd_mda = rd_mda_value[cc_src_current[cc]];
662 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda);
663 if (ret < 0) {
664 fusb302_log(chip,
665 "cannot set SRC measure value, ret=%d",
666 ret);
667 goto done;
668 }
669 ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK,
670 FUSB_REG_MASK_BC_LVL |
671 FUSB_REG_MASK_COMP_CHNG,
672 FUSB_REG_MASK_COMP_CHNG);
673 if (ret < 0) {
674 fusb302_log(chip, "cannot set SRC interrupt, ret=%d",
675 ret);
676 goto done;
677 }
678 chip->intr_comp_chng = true;
679 break;
680 case TYPEC_CC_RD:
681 ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK,
682 FUSB_REG_MASK_BC_LVL |
683 FUSB_REG_MASK_COMP_CHNG,
684 FUSB_REG_MASK_BC_LVL);
685 if (ret < 0) {
686 fusb302_log(chip, "cannot set SRC interrupt, ret=%d",
687 ret);
688 goto done;
689 }
690 chip->intr_bc_lvl = true;
691 break;
692 default:
693 break;
694 }
695 done:
696 mutex_unlock(&chip->lock);
697
698 return ret;
699 }
700
tcpm_get_cc(struct tcpc_dev * dev,enum typec_cc_status * cc1,enum typec_cc_status * cc2)701 static int tcpm_get_cc(struct tcpc_dev *dev, enum typec_cc_status *cc1,
702 enum typec_cc_status *cc2)
703 {
704 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
705 tcpc_dev);
706
707 mutex_lock(&chip->lock);
708 *cc1 = chip->cc1;
709 *cc2 = chip->cc2;
710 fusb302_log(chip, "cc1=%s, cc2=%s", typec_cc_status_name[*cc1],
711 typec_cc_status_name[*cc2]);
712 mutex_unlock(&chip->lock);
713
714 return 0;
715 }
716
tcpm_set_polarity(struct tcpc_dev * dev,enum typec_cc_polarity polarity)717 static int tcpm_set_polarity(struct tcpc_dev *dev,
718 enum typec_cc_polarity polarity)
719 {
720 return 0;
721 }
722
tcpm_set_vconn(struct tcpc_dev * dev,bool on)723 static int tcpm_set_vconn(struct tcpc_dev *dev, bool on)
724 {
725 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
726 tcpc_dev);
727 int ret = 0;
728 u8 switches0_data = 0x00;
729 u8 switches0_mask = FUSB_REG_SWITCHES0_VCONN_CC1 |
730 FUSB_REG_SWITCHES0_VCONN_CC2;
731
732 mutex_lock(&chip->lock);
733 if (chip->vconn_on == on) {
734 fusb302_log(chip, "vconn is already %s", on ? "On" : "Off");
735 goto done;
736 }
737 if (on) {
738 switches0_data = (chip->cc_polarity == TYPEC_POLARITY_CC1) ?
739 FUSB_REG_SWITCHES0_VCONN_CC2 :
740 FUSB_REG_SWITCHES0_VCONN_CC1;
741 }
742 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0,
743 switches0_mask, switches0_data);
744 if (ret < 0)
745 goto done;
746 chip->vconn_on = on;
747 fusb302_log(chip, "vconn := %s", on ? "On" : "Off");
748 done:
749 mutex_unlock(&chip->lock);
750
751 return ret;
752 }
753
tcpm_set_vbus(struct tcpc_dev * dev,bool on,bool charge)754 static int tcpm_set_vbus(struct tcpc_dev *dev, bool on, bool charge)
755 {
756 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
757 tcpc_dev);
758 int ret = 0;
759
760 mutex_lock(&chip->lock);
761 if (chip->vbus_on == on) {
762 fusb302_log(chip, "vbus is already %s", on ? "On" : "Off");
763 } else {
764 if (on)
765 ret = regulator_enable(chip->vbus);
766 else
767 ret = regulator_disable(chip->vbus);
768 if (ret < 0) {
769 fusb302_log(chip, "cannot %s vbus regulator, ret=%d",
770 on ? "enable" : "disable", ret);
771 goto done;
772 }
773 chip->vbus_on = on;
774 fusb302_log(chip, "vbus := %s", on ? "On" : "Off");
775 }
776 if (chip->charge_on == charge)
777 fusb302_log(chip, "charge is already %s",
778 charge ? "On" : "Off");
779 else
780 chip->charge_on = charge;
781
782 done:
783 mutex_unlock(&chip->lock);
784
785 return ret;
786 }
787
fusb302_pd_tx_flush(struct fusb302_chip * chip)788 static int fusb302_pd_tx_flush(struct fusb302_chip *chip)
789 {
790 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL0,
791 FUSB_REG_CONTROL0_TX_FLUSH);
792 }
793
fusb302_pd_rx_flush(struct fusb302_chip * chip)794 static int fusb302_pd_rx_flush(struct fusb302_chip *chip)
795 {
796 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL1,
797 FUSB_REG_CONTROL1_RX_FLUSH);
798 }
799
fusb302_pd_set_auto_goodcrc(struct fusb302_chip * chip,bool on)800 static int fusb302_pd_set_auto_goodcrc(struct fusb302_chip *chip, bool on)
801 {
802 if (on)
803 return fusb302_i2c_set_bits(chip, FUSB_REG_SWITCHES1,
804 FUSB_REG_SWITCHES1_AUTO_GCRC);
805 return fusb302_i2c_clear_bits(chip, FUSB_REG_SWITCHES1,
806 FUSB_REG_SWITCHES1_AUTO_GCRC);
807 }
808
fusb302_pd_set_interrupts(struct fusb302_chip * chip,bool on)809 static int fusb302_pd_set_interrupts(struct fusb302_chip *chip, bool on)
810 {
811 int ret = 0;
812 u8 mask_interrupts = FUSB_REG_MASK_COLLISION;
813 u8 maska_interrupts = FUSB_REG_MASKA_RETRYFAIL |
814 FUSB_REG_MASKA_HARDSENT |
815 FUSB_REG_MASKA_TX_SUCCESS |
816 FUSB_REG_MASKA_HARDRESET;
817 u8 maskb_interrupts = FUSB_REG_MASKB_GCRCSENT;
818
819 ret = on ?
820 fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, mask_interrupts) :
821 fusb302_i2c_set_bits(chip, FUSB_REG_MASK, mask_interrupts);
822 if (ret < 0)
823 return ret;
824 ret = on ?
825 fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA, maska_interrupts) :
826 fusb302_i2c_set_bits(chip, FUSB_REG_MASKA, maska_interrupts);
827 if (ret < 0)
828 return ret;
829 ret = on ?
830 fusb302_i2c_clear_bits(chip, FUSB_REG_MASKB, maskb_interrupts) :
831 fusb302_i2c_set_bits(chip, FUSB_REG_MASKB, maskb_interrupts);
832 return ret;
833 }
834
tcpm_set_pd_rx(struct tcpc_dev * dev,bool on)835 static int tcpm_set_pd_rx(struct tcpc_dev *dev, bool on)
836 {
837 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
838 tcpc_dev);
839 int ret = 0;
840
841 mutex_lock(&chip->lock);
842 ret = fusb302_pd_rx_flush(chip);
843 if (ret < 0) {
844 fusb302_log(chip, "cannot flush pd rx buffer, ret=%d", ret);
845 goto done;
846 }
847 ret = fusb302_pd_tx_flush(chip);
848 if (ret < 0) {
849 fusb302_log(chip, "cannot flush pd tx buffer, ret=%d", ret);
850 goto done;
851 }
852 ret = fusb302_pd_set_auto_goodcrc(chip, on);
853 if (ret < 0) {
854 fusb302_log(chip, "cannot turn %s auto GCRC, ret=%d",
855 on ? "on" : "off", ret);
856 goto done;
857 }
858 ret = fusb302_pd_set_interrupts(chip, on);
859 if (ret < 0) {
860 fusb302_log(chip, "cannot turn %s pd interrupts, ret=%d",
861 on ? "on" : "off", ret);
862 goto done;
863 }
864 fusb302_log(chip, "pd := %s", on ? "on" : "off");
865 done:
866 mutex_unlock(&chip->lock);
867
868 return ret;
869 }
870
871 static const char * const typec_role_name[] = {
872 [TYPEC_SINK] = "Sink",
873 [TYPEC_SOURCE] = "Source",
874 };
875
876 static const char * const typec_data_role_name[] = {
877 [TYPEC_DEVICE] = "Device",
878 [TYPEC_HOST] = "Host",
879 };
880
tcpm_set_roles(struct tcpc_dev * dev,bool attached,enum typec_role pwr,enum typec_data_role data)881 static int tcpm_set_roles(struct tcpc_dev *dev, bool attached,
882 enum typec_role pwr, enum typec_data_role data)
883 {
884 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
885 tcpc_dev);
886 int ret = 0;
887 u8 switches1_mask = FUSB_REG_SWITCHES1_POWERROLE |
888 FUSB_REG_SWITCHES1_DATAROLE;
889 u8 switches1_data = 0x00;
890
891 mutex_lock(&chip->lock);
892 if (pwr == TYPEC_SOURCE)
893 switches1_data |= FUSB_REG_SWITCHES1_POWERROLE;
894 if (data == TYPEC_HOST)
895 switches1_data |= FUSB_REG_SWITCHES1_DATAROLE;
896 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES1,
897 switches1_mask, switches1_data);
898 if (ret < 0) {
899 fusb302_log(chip, "unable to set pd header %s, %s, ret=%d",
900 typec_role_name[pwr], typec_data_role_name[data],
901 ret);
902 goto done;
903 }
904 fusb302_log(chip, "pd header := %s, %s", typec_role_name[pwr],
905 typec_data_role_name[data]);
906 done:
907 mutex_unlock(&chip->lock);
908
909 return ret;
910 }
911
tcpm_start_toggling(struct tcpc_dev * dev,enum typec_port_type port_type,enum typec_cc_status cc)912 static int tcpm_start_toggling(struct tcpc_dev *dev,
913 enum typec_port_type port_type,
914 enum typec_cc_status cc)
915 {
916 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
917 tcpc_dev);
918 enum toggling_mode mode = TOGGLING_MODE_OFF;
919 int ret = 0;
920
921 switch (port_type) {
922 case TYPEC_PORT_SRC:
923 mode = TOGGLING_MODE_SRC;
924 break;
925 case TYPEC_PORT_SNK:
926 mode = TOGGLING_MODE_SNK;
927 break;
928 case TYPEC_PORT_DRP:
929 mode = TOGGLING_MODE_DRP;
930 break;
931 }
932
933 mutex_lock(&chip->lock);
934 ret = fusb302_set_src_current(chip, cc_src_current[cc]);
935 if (ret < 0) {
936 fusb302_log(chip, "unable to set src current %s, ret=%d",
937 typec_cc_status_name[cc], ret);
938 goto done;
939 }
940 ret = fusb302_set_toggling(chip, mode);
941 if (ret < 0) {
942 fusb302_log(chip,
943 "unable to start drp toggling, ret=%d", ret);
944 goto done;
945 }
946 fusb302_log(chip, "start drp toggling");
947 done:
948 mutex_unlock(&chip->lock);
949
950 return ret;
951 }
952
fusb302_pd_send_message(struct fusb302_chip * chip,const struct pd_message * msg)953 static int fusb302_pd_send_message(struct fusb302_chip *chip,
954 const struct pd_message *msg)
955 {
956 int ret = 0;
957 u8 buf[40];
958 u8 pos = 0;
959 int len;
960
961 /* SOP tokens */
962 buf[pos++] = FUSB302_TKN_SYNC1;
963 buf[pos++] = FUSB302_TKN_SYNC1;
964 buf[pos++] = FUSB302_TKN_SYNC1;
965 buf[pos++] = FUSB302_TKN_SYNC2;
966
967 len = pd_header_cnt_le(msg->header) * 4;
968 /* plug 2 for header */
969 len += 2;
970 if (len > 0x1F) {
971 fusb302_log(chip,
972 "PD message too long %d (incl. header)", len);
973 return -EINVAL;
974 }
975 /* packsym tells the FUSB302 chip that the next X bytes are payload */
976 buf[pos++] = FUSB302_TKN_PACKSYM | (len & 0x1F);
977 memcpy(&buf[pos], &msg->header, sizeof(msg->header));
978 pos += sizeof(msg->header);
979
980 len -= 2;
981 memcpy(&buf[pos], msg->payload, len);
982 pos += len;
983
984 /* CRC */
985 buf[pos++] = FUSB302_TKN_JAMCRC;
986 /* EOP */
987 buf[pos++] = FUSB302_TKN_EOP;
988 /* turn tx off after sending message */
989 buf[pos++] = FUSB302_TKN_TXOFF;
990 /* start transmission */
991 buf[pos++] = FUSB302_TKN_TXON;
992
993 ret = fusb302_i2c_block_write(chip, FUSB_REG_FIFOS, pos, buf);
994 if (ret < 0)
995 return ret;
996 fusb302_log(chip, "sending PD message header: %x", msg->header);
997 fusb302_log(chip, "sending PD message len: %d", len);
998
999 return ret;
1000 }
1001
fusb302_pd_send_hardreset(struct fusb302_chip * chip)1002 static int fusb302_pd_send_hardreset(struct fusb302_chip *chip)
1003 {
1004 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3,
1005 FUSB_REG_CONTROL3_SEND_HARDRESET);
1006 }
1007
1008 static const char * const transmit_type_name[] = {
1009 [TCPC_TX_SOP] = "SOP",
1010 [TCPC_TX_SOP_PRIME] = "SOP'",
1011 [TCPC_TX_SOP_PRIME_PRIME] = "SOP''",
1012 [TCPC_TX_SOP_DEBUG_PRIME] = "DEBUG'",
1013 [TCPC_TX_SOP_DEBUG_PRIME_PRIME] = "DEBUG''",
1014 [TCPC_TX_HARD_RESET] = "HARD_RESET",
1015 [TCPC_TX_CABLE_RESET] = "CABLE_RESET",
1016 [TCPC_TX_BIST_MODE_2] = "BIST_MODE_2",
1017 };
1018
tcpm_pd_transmit(struct tcpc_dev * dev,enum tcpm_transmit_type type,const struct pd_message * msg,unsigned int negotiated_rev)1019 static int tcpm_pd_transmit(struct tcpc_dev *dev, enum tcpm_transmit_type type,
1020 const struct pd_message *msg, unsigned int negotiated_rev)
1021 {
1022 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
1023 tcpc_dev);
1024 int ret = 0;
1025
1026 mutex_lock(&chip->lock);
1027 switch (type) {
1028 case TCPC_TX_SOP:
1029 /* nRetryCount 3 in P2.0 spec, whereas 2 in PD3.0 spec */
1030 ret = fusb302_enable_tx_auto_retries(chip, negotiated_rev > PD_REV20 ?
1031 FUSB_REG_CONTROL3_N_RETRIES_2 :
1032 FUSB_REG_CONTROL3_N_RETRIES_3);
1033 if (ret < 0)
1034 fusb302_log(chip, "Cannot update retry count ret=%d", ret);
1035
1036 ret = fusb302_pd_send_message(chip, msg);
1037 if (ret < 0)
1038 fusb302_log(chip,
1039 "cannot send PD message, ret=%d", ret);
1040 break;
1041 case TCPC_TX_HARD_RESET:
1042 ret = fusb302_pd_send_hardreset(chip);
1043 if (ret < 0)
1044 fusb302_log(chip,
1045 "cannot send hardreset, ret=%d", ret);
1046 break;
1047 default:
1048 fusb302_log(chip, "type %s not supported",
1049 transmit_type_name[type]);
1050 ret = -EINVAL;
1051 }
1052 mutex_unlock(&chip->lock);
1053
1054 return ret;
1055 }
1056
fusb302_bc_lvl_to_cc(u8 bc_lvl)1057 static enum typec_cc_status fusb302_bc_lvl_to_cc(u8 bc_lvl)
1058 {
1059 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_1230_MAX)
1060 return TYPEC_CC_RP_3_0;
1061 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_600_1230)
1062 return TYPEC_CC_RP_1_5;
1063 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_200_600)
1064 return TYPEC_CC_RP_DEF;
1065 return TYPEC_CC_OPEN;
1066 }
1067
fusb302_bc_lvl_handler_work(struct work_struct * work)1068 static void fusb302_bc_lvl_handler_work(struct work_struct *work)
1069 {
1070 struct fusb302_chip *chip = container_of(work, struct fusb302_chip,
1071 bc_lvl_handler.work);
1072 int ret = 0;
1073 u8 status0;
1074 u8 bc_lvl;
1075 enum typec_cc_status cc_status;
1076
1077 mutex_lock(&chip->lock);
1078 if (!chip->intr_bc_lvl) {
1079 fusb302_log(chip, "BC_LVL interrupt is turned off, abort");
1080 goto done;
1081 }
1082 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1083 if (ret < 0)
1084 goto done;
1085 fusb302_log(chip, "BC_LVL handler, status0=0x%02x", status0);
1086 if (status0 & FUSB_REG_STATUS0_ACTIVITY) {
1087 fusb302_log(chip, "CC activities detected, delay handling");
1088 mod_delayed_work(chip->wq, &chip->bc_lvl_handler,
1089 msecs_to_jiffies(T_BC_LVL_DEBOUNCE_DELAY_MS));
1090 goto done;
1091 }
1092 bc_lvl = status0 & FUSB_REG_STATUS0_BC_LVL_MASK;
1093 cc_status = fusb302_bc_lvl_to_cc(bc_lvl);
1094 if (chip->cc_polarity == TYPEC_POLARITY_CC1) {
1095 if (chip->cc1 != cc_status) {
1096 fusb302_log(chip, "cc1: %s -> %s",
1097 typec_cc_status_name[chip->cc1],
1098 typec_cc_status_name[cc_status]);
1099 chip->cc1 = cc_status;
1100 tcpm_cc_change(chip->tcpm_port);
1101 }
1102 } else {
1103 if (chip->cc2 != cc_status) {
1104 fusb302_log(chip, "cc2: %s -> %s",
1105 typec_cc_status_name[chip->cc2],
1106 typec_cc_status_name[cc_status]);
1107 chip->cc2 = cc_status;
1108 tcpm_cc_change(chip->tcpm_port);
1109 }
1110 }
1111
1112 done:
1113 mutex_unlock(&chip->lock);
1114 }
1115
init_tcpc_dev(struct tcpc_dev * fusb302_tcpc_dev)1116 static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev)
1117 {
1118 fusb302_tcpc_dev->init = tcpm_init;
1119 fusb302_tcpc_dev->get_vbus = tcpm_get_vbus;
1120 fusb302_tcpc_dev->get_current_limit = tcpm_get_current_limit;
1121 fusb302_tcpc_dev->set_cc = tcpm_set_cc;
1122 fusb302_tcpc_dev->get_cc = tcpm_get_cc;
1123 fusb302_tcpc_dev->set_polarity = tcpm_set_polarity;
1124 fusb302_tcpc_dev->set_vconn = tcpm_set_vconn;
1125 fusb302_tcpc_dev->set_vbus = tcpm_set_vbus;
1126 fusb302_tcpc_dev->set_pd_rx = tcpm_set_pd_rx;
1127 fusb302_tcpc_dev->set_roles = tcpm_set_roles;
1128 fusb302_tcpc_dev->start_toggling = tcpm_start_toggling;
1129 fusb302_tcpc_dev->pd_transmit = tcpm_pd_transmit;
1130 }
1131
1132 static const char * const cc_polarity_name[] = {
1133 [TYPEC_POLARITY_CC1] = "Polarity_CC1",
1134 [TYPEC_POLARITY_CC2] = "Polarity_CC2",
1135 };
1136
fusb302_set_cc_polarity_and_pull(struct fusb302_chip * chip,enum typec_cc_polarity cc_polarity,bool pull_up,bool pull_down)1137 static int fusb302_set_cc_polarity_and_pull(struct fusb302_chip *chip,
1138 enum typec_cc_polarity cc_polarity,
1139 bool pull_up, bool pull_down)
1140 {
1141 int ret = 0;
1142 u8 switches0_data = 0x00;
1143 u8 switches1_mask = FUSB_REG_SWITCHES1_TXCC1_EN |
1144 FUSB_REG_SWITCHES1_TXCC2_EN;
1145 u8 switches1_data = 0x00;
1146
1147 if (pull_down)
1148 switches0_data |= FUSB_REG_SWITCHES0_CC1_PD_EN |
1149 FUSB_REG_SWITCHES0_CC2_PD_EN;
1150
1151 if (cc_polarity == TYPEC_POLARITY_CC1) {
1152 switches0_data |= FUSB_REG_SWITCHES0_MEAS_CC1;
1153 if (chip->vconn_on)
1154 switches0_data |= FUSB_REG_SWITCHES0_VCONN_CC2;
1155 if (pull_up)
1156 switches0_data |= FUSB_REG_SWITCHES0_CC1_PU_EN;
1157 switches1_data = FUSB_REG_SWITCHES1_TXCC1_EN;
1158 } else {
1159 switches0_data |= FUSB_REG_SWITCHES0_MEAS_CC2;
1160 if (chip->vconn_on)
1161 switches0_data |= FUSB_REG_SWITCHES0_VCONN_CC1;
1162 if (pull_up)
1163 switches0_data |= FUSB_REG_SWITCHES0_CC2_PU_EN;
1164 switches1_data = FUSB_REG_SWITCHES1_TXCC2_EN;
1165 }
1166 ret = fusb302_i2c_write(chip, FUSB_REG_SWITCHES0, switches0_data);
1167 if (ret < 0)
1168 return ret;
1169 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES1,
1170 switches1_mask, switches1_data);
1171 if (ret < 0)
1172 return ret;
1173 chip->cc_polarity = cc_polarity;
1174
1175 return ret;
1176 }
1177
fusb302_handle_togdone_snk(struct fusb302_chip * chip,u8 togdone_result)1178 static int fusb302_handle_togdone_snk(struct fusb302_chip *chip,
1179 u8 togdone_result)
1180 {
1181 int ret = 0;
1182 u8 status0;
1183 u8 bc_lvl;
1184 enum typec_cc_polarity cc_polarity;
1185 enum typec_cc_status cc_status_active, cc1, cc2;
1186
1187 /* set polarity and pull_up, pull_down */
1188 cc_polarity = (togdone_result == FUSB_REG_STATUS1A_TOGSS_SNK1) ?
1189 TYPEC_POLARITY_CC1 : TYPEC_POLARITY_CC2;
1190 ret = fusb302_set_cc_polarity_and_pull(chip, cc_polarity, false, true);
1191 if (ret < 0) {
1192 fusb302_log(chip, "cannot set cc polarity %s, ret=%d",
1193 cc_polarity_name[cc_polarity], ret);
1194 return ret;
1195 }
1196 /* fusb302_set_cc_polarity() has set the correct measure block */
1197 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1198 if (ret < 0)
1199 return ret;
1200 bc_lvl = status0 & FUSB_REG_STATUS0_BC_LVL_MASK;
1201 cc_status_active = fusb302_bc_lvl_to_cc(bc_lvl);
1202 /* restart toggling if the cc status on the active line is OPEN */
1203 if (cc_status_active == TYPEC_CC_OPEN) {
1204 fusb302_log(chip, "restart toggling as CC_OPEN detected");
1205 ret = fusb302_set_toggling(chip, chip->toggling_mode);
1206 return ret;
1207 }
1208 /* update tcpm with the new cc value */
1209 cc1 = (cc_polarity == TYPEC_POLARITY_CC1) ?
1210 cc_status_active : TYPEC_CC_OPEN;
1211 cc2 = (cc_polarity == TYPEC_POLARITY_CC2) ?
1212 cc_status_active : TYPEC_CC_OPEN;
1213 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) {
1214 chip->cc1 = cc1;
1215 chip->cc2 = cc2;
1216 tcpm_cc_change(chip->tcpm_port);
1217 }
1218 /* turn off toggling */
1219 ret = fusb302_set_toggling(chip, TOGGLING_MODE_OFF);
1220 if (ret < 0) {
1221 fusb302_log(chip,
1222 "cannot set toggling mode off, ret=%d", ret);
1223 return ret;
1224 }
1225 /* unmask bc_lvl interrupt */
1226 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, FUSB_REG_MASK_BC_LVL);
1227 if (ret < 0) {
1228 fusb302_log(chip,
1229 "cannot unmask bc_lcl interrupt, ret=%d", ret);
1230 return ret;
1231 }
1232 chip->intr_bc_lvl = true;
1233 fusb302_log(chip, "detected cc1=%s, cc2=%s",
1234 typec_cc_status_name[cc1],
1235 typec_cc_status_name[cc2]);
1236
1237 return ret;
1238 }
1239
1240 /* On error returns < 0, otherwise a typec_cc_status value */
fusb302_get_src_cc_status(struct fusb302_chip * chip,enum typec_cc_polarity cc_polarity,enum typec_cc_status * cc)1241 static int fusb302_get_src_cc_status(struct fusb302_chip *chip,
1242 enum typec_cc_polarity cc_polarity,
1243 enum typec_cc_status *cc)
1244 {
1245 u8 ra_mda = ra_mda_value[chip->src_current_status];
1246 u8 rd_mda = rd_mda_value[chip->src_current_status];
1247 u8 switches0_data, status0;
1248 int ret;
1249
1250 /* Step 1: Set switches so that we measure the right CC pin */
1251 switches0_data = (cc_polarity == TYPEC_POLARITY_CC1) ?
1252 FUSB_REG_SWITCHES0_CC1_PU_EN | FUSB_REG_SWITCHES0_MEAS_CC1 :
1253 FUSB_REG_SWITCHES0_CC2_PU_EN | FUSB_REG_SWITCHES0_MEAS_CC2;
1254 ret = fusb302_i2c_write(chip, FUSB_REG_SWITCHES0, switches0_data);
1255 if (ret < 0)
1256 return ret;
1257
1258 fusb302_i2c_read(chip, FUSB_REG_SWITCHES0, &status0);
1259 fusb302_log(chip, "get_src_cc_status switches: 0x%0x", status0);
1260
1261 /* Step 2: Set compararator volt to differentiate between Open and Rd */
1262 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda);
1263 if (ret < 0)
1264 return ret;
1265
1266 usleep_range(50, 100);
1267 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1268 if (ret < 0)
1269 return ret;
1270
1271 fusb302_log(chip, "get_src_cc_status rd_mda status0: 0x%0x", status0);
1272 if (status0 & FUSB_REG_STATUS0_COMP) {
1273 *cc = TYPEC_CC_OPEN;
1274 return 0;
1275 }
1276
1277 /* Step 3: Set compararator input to differentiate between Rd and Ra. */
1278 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, ra_mda);
1279 if (ret < 0)
1280 return ret;
1281
1282 usleep_range(50, 100);
1283 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1284 if (ret < 0)
1285 return ret;
1286
1287 fusb302_log(chip, "get_src_cc_status ra_mda status0: 0x%0x", status0);
1288 if (status0 & FUSB_REG_STATUS0_COMP)
1289 *cc = TYPEC_CC_RD;
1290 else
1291 *cc = TYPEC_CC_RA;
1292
1293 return 0;
1294 }
1295
fusb302_handle_togdone_src(struct fusb302_chip * chip,u8 togdone_result)1296 static int fusb302_handle_togdone_src(struct fusb302_chip *chip,
1297 u8 togdone_result)
1298 {
1299 /*
1300 * - set polarity (measure cc, vconn, tx)
1301 * - set pull_up, pull_down
1302 * - set cc1, cc2, and update to tcpm_port
1303 * - set I_COMP interrupt on
1304 */
1305 int ret = 0;
1306 u8 rd_mda = rd_mda_value[chip->src_current_status];
1307 enum toggling_mode toggling_mode = chip->toggling_mode;
1308 enum typec_cc_polarity cc_polarity;
1309 enum typec_cc_status cc1, cc2;
1310
1311 /*
1312 * The toggle-engine will stop in a src state if it sees either Ra or
1313 * Rd. Determine the status for both CC pins, starting with the one
1314 * where toggling stopped, as that is where the switches point now.
1315 */
1316 if (togdone_result == FUSB_REG_STATUS1A_TOGSS_SRC1)
1317 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC1, &cc1);
1318 else
1319 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC2, &cc2);
1320 if (ret < 0)
1321 return ret;
1322 /* we must turn off toggling before we can measure the other pin */
1323 ret = fusb302_set_toggling(chip, TOGGLING_MODE_OFF);
1324 if (ret < 0) {
1325 fusb302_log(chip, "cannot set toggling mode off, ret=%d", ret);
1326 return ret;
1327 }
1328 /* get the status of the other pin */
1329 if (togdone_result == FUSB_REG_STATUS1A_TOGSS_SRC1)
1330 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC2, &cc2);
1331 else
1332 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC1, &cc1);
1333 if (ret < 0)
1334 return ret;
1335
1336 /* determine polarity based on the status of both pins */
1337 if (cc1 == TYPEC_CC_RD &&
1338 (cc2 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_RA)) {
1339 cc_polarity = TYPEC_POLARITY_CC1;
1340 } else if (cc2 == TYPEC_CC_RD &&
1341 (cc1 == TYPEC_CC_OPEN || cc1 == TYPEC_CC_RA)) {
1342 cc_polarity = TYPEC_POLARITY_CC2;
1343 } else {
1344 fusb302_log(chip, "unexpected CC status cc1=%s, cc2=%s, restarting toggling",
1345 typec_cc_status_name[cc1],
1346 typec_cc_status_name[cc2]);
1347 return fusb302_set_toggling(chip, toggling_mode);
1348 }
1349 /* set polarity and pull_up, pull_down */
1350 ret = fusb302_set_cc_polarity_and_pull(chip, cc_polarity, true, false);
1351 if (ret < 0) {
1352 fusb302_log(chip, "cannot set cc polarity %s, ret=%d",
1353 cc_polarity_name[cc_polarity], ret);
1354 return ret;
1355 }
1356 /* update tcpm with the new cc value */
1357 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) {
1358 chip->cc1 = cc1;
1359 chip->cc2 = cc2;
1360 tcpm_cc_change(chip->tcpm_port);
1361 }
1362 /* set MDAC to Rd threshold, and unmask I_COMP for unplug detection */
1363 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda);
1364 if (ret < 0)
1365 return ret;
1366 /* unmask comp_chng interrupt */
1367 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK,
1368 FUSB_REG_MASK_COMP_CHNG);
1369 if (ret < 0) {
1370 fusb302_log(chip,
1371 "cannot unmask comp_chng interrupt, ret=%d", ret);
1372 return ret;
1373 }
1374 chip->intr_comp_chng = true;
1375 fusb302_log(chip, "detected cc1=%s, cc2=%s",
1376 typec_cc_status_name[cc1],
1377 typec_cc_status_name[cc2]);
1378
1379 return ret;
1380 }
1381
fusb302_handle_togdone(struct fusb302_chip * chip)1382 static int fusb302_handle_togdone(struct fusb302_chip *chip)
1383 {
1384 int ret = 0;
1385 u8 status1a;
1386 u8 togdone_result;
1387
1388 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS1A, &status1a);
1389 if (ret < 0)
1390 return ret;
1391 togdone_result = (status1a >> FUSB_REG_STATUS1A_TOGSS_POS) &
1392 FUSB_REG_STATUS1A_TOGSS_MASK;
1393 switch (togdone_result) {
1394 case FUSB_REG_STATUS1A_TOGSS_SNK1:
1395 case FUSB_REG_STATUS1A_TOGSS_SNK2:
1396 return fusb302_handle_togdone_snk(chip, togdone_result);
1397 case FUSB_REG_STATUS1A_TOGSS_SRC1:
1398 case FUSB_REG_STATUS1A_TOGSS_SRC2:
1399 return fusb302_handle_togdone_src(chip, togdone_result);
1400 case FUSB_REG_STATUS1A_TOGSS_AA:
1401 /* doesn't support */
1402 fusb302_log(chip, "AudioAccessory not supported");
1403 fusb302_set_toggling(chip, chip->toggling_mode);
1404 break;
1405 default:
1406 fusb302_log(chip, "TOGDONE with an invalid state: %d",
1407 togdone_result);
1408 fusb302_set_toggling(chip, chip->toggling_mode);
1409 break;
1410 }
1411 return ret;
1412 }
1413
fusb302_pd_reset(struct fusb302_chip * chip)1414 static int fusb302_pd_reset(struct fusb302_chip *chip)
1415 {
1416 return fusb302_i2c_set_bits(chip, FUSB_REG_RESET,
1417 FUSB_REG_RESET_PD_RESET);
1418 }
1419
fusb302_pd_read_message(struct fusb302_chip * chip,struct pd_message * msg)1420 static int fusb302_pd_read_message(struct fusb302_chip *chip,
1421 struct pd_message *msg)
1422 {
1423 int ret = 0;
1424 u8 token;
1425 u8 crc[4];
1426 int len;
1427
1428 /* first SOP token */
1429 ret = fusb302_i2c_read(chip, FUSB_REG_FIFOS, &token);
1430 if (ret < 0)
1431 return ret;
1432 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, 2,
1433 (u8 *)&msg->header);
1434 if (ret < 0)
1435 return ret;
1436 len = pd_header_cnt_le(msg->header) * 4;
1437 /* add 4 to length to include the CRC */
1438 if (len > PD_MAX_PAYLOAD * 4) {
1439 fusb302_log(chip, "PD message too long %d", len);
1440 return -EINVAL;
1441 }
1442 if (len > 0) {
1443 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, len,
1444 (u8 *)msg->payload);
1445 if (ret < 0)
1446 return ret;
1447 }
1448 /* another 4 bytes to read CRC out */
1449 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, 4, crc);
1450 if (ret < 0)
1451 return ret;
1452 fusb302_log(chip, "PD message header: %x", msg->header);
1453 fusb302_log(chip, "PD message len: %d", len);
1454
1455 /*
1456 * Check if we've read off a GoodCRC message. If so then indicate to
1457 * TCPM that the previous transmission has completed. Otherwise we pass
1458 * the received message over to TCPM for processing.
1459 *
1460 * We make this check here instead of basing the reporting decision on
1461 * the IRQ event type, as it's possible for the chip to report the
1462 * TX_SUCCESS and GCRCSENT events out of order on occasion, so we need
1463 * to check the message type to ensure correct reporting to TCPM.
1464 */
1465 if ((!len) && (pd_header_type_le(msg->header) == PD_CTRL_GOOD_CRC))
1466 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS);
1467 else
1468 tcpm_pd_receive(chip->tcpm_port, msg);
1469
1470 return ret;
1471 }
1472
fusb302_irq_intn(int irq,void * dev_id)1473 static irqreturn_t fusb302_irq_intn(int irq, void *dev_id)
1474 {
1475 struct fusb302_chip *chip = dev_id;
1476 unsigned long flags;
1477
1478 /* Disable our level triggered IRQ until our irq_work has cleared it */
1479 disable_irq_nosync(chip->gpio_int_n_irq);
1480
1481 spin_lock_irqsave(&chip->irq_lock, flags);
1482 if (chip->irq_suspended)
1483 chip->irq_while_suspended = true;
1484 else
1485 schedule_work(&chip->irq_work);
1486 spin_unlock_irqrestore(&chip->irq_lock, flags);
1487
1488 return IRQ_HANDLED;
1489 }
1490
fusb302_irq_work(struct work_struct * work)1491 static void fusb302_irq_work(struct work_struct *work)
1492 {
1493 struct fusb302_chip *chip = container_of(work, struct fusb302_chip,
1494 irq_work);
1495 int ret = 0;
1496 u8 interrupt;
1497 u8 interrupta;
1498 u8 interruptb;
1499 u8 status0;
1500 bool vbus_present;
1501 bool comp_result;
1502 bool intr_togdone;
1503 bool intr_bc_lvl;
1504 bool intr_comp_chng;
1505 struct pd_message pd_msg;
1506
1507 mutex_lock(&chip->lock);
1508 /* grab a snapshot of intr flags */
1509 intr_togdone = chip->intr_togdone;
1510 intr_bc_lvl = chip->intr_bc_lvl;
1511 intr_comp_chng = chip->intr_comp_chng;
1512
1513 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPT, &interrupt);
1514 if (ret < 0)
1515 goto done;
1516 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPTA, &interrupta);
1517 if (ret < 0)
1518 goto done;
1519 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPTB, &interruptb);
1520 if (ret < 0)
1521 goto done;
1522 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1523 if (ret < 0)
1524 goto done;
1525 fusb302_log(chip,
1526 "IRQ: 0x%02x, a: 0x%02x, b: 0x%02x, status0: 0x%02x",
1527 interrupt, interrupta, interruptb, status0);
1528
1529 if (interrupt & FUSB_REG_INTERRUPT_VBUSOK) {
1530 vbus_present = !!(status0 & FUSB_REG_STATUS0_VBUSOK);
1531 fusb302_log(chip, "IRQ: VBUS_OK, vbus=%s",
1532 vbus_present ? "On" : "Off");
1533 if (vbus_present != chip->vbus_present) {
1534 chip->vbus_present = vbus_present;
1535 tcpm_vbus_change(chip->tcpm_port);
1536 }
1537 }
1538
1539 if ((interrupta & FUSB_REG_INTERRUPTA_TOGDONE) && intr_togdone) {
1540 fusb302_log(chip, "IRQ: TOGDONE");
1541 ret = fusb302_handle_togdone(chip);
1542 if (ret < 0) {
1543 fusb302_log(chip,
1544 "handle togdone error, ret=%d", ret);
1545 goto done;
1546 }
1547 }
1548
1549 if ((interrupt & FUSB_REG_INTERRUPT_BC_LVL) && intr_bc_lvl) {
1550 fusb302_log(chip, "IRQ: BC_LVL, handler pending");
1551 /*
1552 * as BC_LVL interrupt can be affected by PD activity,
1553 * apply delay to for the handler to wait for the PD
1554 * signaling to finish.
1555 */
1556 mod_delayed_work(chip->wq, &chip->bc_lvl_handler,
1557 msecs_to_jiffies(T_BC_LVL_DEBOUNCE_DELAY_MS));
1558 }
1559
1560 if ((interrupt & FUSB_REG_INTERRUPT_COMP_CHNG) && intr_comp_chng) {
1561 comp_result = !!(status0 & FUSB_REG_STATUS0_COMP);
1562 fusb302_log(chip, "IRQ: COMP_CHNG, comp=%s",
1563 comp_result ? "true" : "false");
1564 if (comp_result) {
1565 /* cc level > Rd_threshold, detach */
1566 chip->cc1 = TYPEC_CC_OPEN;
1567 chip->cc2 = TYPEC_CC_OPEN;
1568 tcpm_cc_change(chip->tcpm_port);
1569 }
1570 }
1571
1572 if (interrupt & FUSB_REG_INTERRUPT_COLLISION) {
1573 fusb302_log(chip, "IRQ: PD collision");
1574 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_FAILED);
1575 }
1576
1577 if (interrupta & FUSB_REG_INTERRUPTA_RETRYFAIL) {
1578 fusb302_log(chip, "IRQ: PD retry failed");
1579 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_FAILED);
1580 }
1581
1582 if (interrupta & FUSB_REG_INTERRUPTA_HARDSENT) {
1583 fusb302_log(chip, "IRQ: PD hardreset sent");
1584 ret = fusb302_pd_reset(chip);
1585 if (ret < 0) {
1586 fusb302_log(chip, "cannot PD reset, ret=%d", ret);
1587 goto done;
1588 }
1589 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS);
1590 }
1591
1592 if (interrupta & FUSB_REG_INTERRUPTA_TX_SUCCESS) {
1593 fusb302_log(chip, "IRQ: PD tx success");
1594 ret = fusb302_pd_read_message(chip, &pd_msg);
1595 if (ret < 0) {
1596 fusb302_log(chip,
1597 "cannot read in PD message, ret=%d", ret);
1598 goto done;
1599 }
1600 }
1601
1602 if (interrupta & FUSB_REG_INTERRUPTA_HARDRESET) {
1603 fusb302_log(chip, "IRQ: PD received hardreset");
1604 ret = fusb302_pd_reset(chip);
1605 if (ret < 0) {
1606 fusb302_log(chip, "cannot PD reset, ret=%d", ret);
1607 goto done;
1608 }
1609 tcpm_pd_hard_reset(chip->tcpm_port);
1610 }
1611
1612 if (interruptb & FUSB_REG_INTERRUPTB_GCRCSENT) {
1613 fusb302_log(chip, "IRQ: PD sent good CRC");
1614 ret = fusb302_pd_read_message(chip, &pd_msg);
1615 if (ret < 0) {
1616 fusb302_log(chip,
1617 "cannot read in PD message, ret=%d", ret);
1618 goto done;
1619 }
1620 }
1621 done:
1622 mutex_unlock(&chip->lock);
1623 enable_irq(chip->gpio_int_n_irq);
1624 }
1625
init_gpio(struct fusb302_chip * chip)1626 static int init_gpio(struct fusb302_chip *chip)
1627 {
1628 struct device *dev = chip->dev;
1629 int ret = 0;
1630
1631 chip->gpio_int_n = devm_gpiod_get(dev, "fcs,int_n", GPIOD_IN);
1632 if (IS_ERR(chip->gpio_int_n)) {
1633 dev_err(dev, "failed to request gpio_int_n\n");
1634 return PTR_ERR(chip->gpio_int_n);
1635 }
1636 ret = gpiod_to_irq(chip->gpio_int_n);
1637 if (ret < 0) {
1638 dev_err(dev,
1639 "cannot request IRQ for GPIO Int_N, ret=%d", ret);
1640 return ret;
1641 }
1642 chip->gpio_int_n_irq = ret;
1643 return 0;
1644 }
1645
1646 #define PDO_FIXED_FLAGS \
1647 (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | PDO_FIXED_USB_COMM)
1648
1649 static const u32 src_pdo[] = {
1650 PDO_FIXED(5000, 400, PDO_FIXED_FLAGS)
1651 };
1652
1653 static const u32 snk_pdo[] = {
1654 PDO_FIXED(5000, 400, PDO_FIXED_FLAGS)
1655 };
1656
1657 static const struct property_entry port_props[] = {
1658 PROPERTY_ENTRY_STRING("data-role", "dual"),
1659 PROPERTY_ENTRY_STRING("power-role", "dual"),
1660 PROPERTY_ENTRY_STRING("try-power-role", "sink"),
1661 PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo),
1662 PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo),
1663 PROPERTY_ENTRY_U32("op-sink-microwatt", 2500000),
1664 { }
1665 };
1666
fusb302_fwnode_get(struct device * dev)1667 static struct fwnode_handle *fusb302_fwnode_get(struct device *dev)
1668 {
1669 struct fwnode_handle *fwnode;
1670
1671 fwnode = device_get_named_child_node(dev, "connector");
1672 if (!fwnode)
1673 fwnode = fwnode_create_software_node(port_props, NULL);
1674
1675 return fwnode;
1676 }
1677
fusb302_probe(struct i2c_client * client,const struct i2c_device_id * id)1678 static int fusb302_probe(struct i2c_client *client,
1679 const struct i2c_device_id *id)
1680 {
1681 struct fusb302_chip *chip;
1682 struct i2c_adapter *adapter = client->adapter;
1683 struct device *dev = &client->dev;
1684 const char *name;
1685 int ret = 0;
1686
1687 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
1688 dev_err(&client->dev,
1689 "I2C/SMBus block functionality not supported!\n");
1690 return -ENODEV;
1691 }
1692 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1693 if (!chip)
1694 return -ENOMEM;
1695
1696 chip->i2c_client = client;
1697 chip->dev = &client->dev;
1698 mutex_init(&chip->lock);
1699
1700 /*
1701 * Devicetree platforms should get extcon via phandle (not yet
1702 * supported). On ACPI platforms, we get the name from a device prop.
1703 * This device prop is for kernel internal use only and is expected
1704 * to be set by the platform code which also registers the i2c client
1705 * for the fusb302.
1706 */
1707 if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) {
1708 chip->extcon = extcon_get_extcon_dev(name);
1709 if (!chip->extcon)
1710 return -EPROBE_DEFER;
1711 }
1712
1713 chip->vbus = devm_regulator_get(chip->dev, "vbus");
1714 if (IS_ERR(chip->vbus))
1715 return PTR_ERR(chip->vbus);
1716
1717 chip->wq = create_singlethread_workqueue(dev_name(chip->dev));
1718 if (!chip->wq)
1719 return -ENOMEM;
1720
1721 spin_lock_init(&chip->irq_lock);
1722 INIT_WORK(&chip->irq_work, fusb302_irq_work);
1723 INIT_DELAYED_WORK(&chip->bc_lvl_handler, fusb302_bc_lvl_handler_work);
1724 init_tcpc_dev(&chip->tcpc_dev);
1725 fusb302_debugfs_init(chip);
1726
1727 if (client->irq) {
1728 chip->gpio_int_n_irq = client->irq;
1729 } else {
1730 ret = init_gpio(chip);
1731 if (ret < 0)
1732 goto destroy_workqueue;
1733 }
1734
1735 chip->tcpc_dev.fwnode = fusb302_fwnode_get(dev);
1736 if (IS_ERR(chip->tcpc_dev.fwnode)) {
1737 ret = PTR_ERR(chip->tcpc_dev.fwnode);
1738 goto destroy_workqueue;
1739 }
1740
1741 chip->tcpm_port = tcpm_register_port(&client->dev, &chip->tcpc_dev);
1742 if (IS_ERR(chip->tcpm_port)) {
1743 fwnode_handle_put(chip->tcpc_dev.fwnode);
1744 ret = PTR_ERR(chip->tcpm_port);
1745 if (ret != -EPROBE_DEFER)
1746 dev_err(dev, "cannot register tcpm port, ret=%d", ret);
1747 goto destroy_workqueue;
1748 }
1749
1750 ret = request_irq(chip->gpio_int_n_irq, fusb302_irq_intn,
1751 IRQF_ONESHOT | IRQF_TRIGGER_LOW,
1752 "fsc_interrupt_int_n", chip);
1753 if (ret < 0) {
1754 dev_err(dev, "cannot request IRQ for GPIO Int_N, ret=%d", ret);
1755 goto tcpm_unregister_port;
1756 }
1757 enable_irq_wake(chip->gpio_int_n_irq);
1758 i2c_set_clientdata(client, chip);
1759
1760 return ret;
1761
1762 tcpm_unregister_port:
1763 tcpm_unregister_port(chip->tcpm_port);
1764 fwnode_handle_put(chip->tcpc_dev.fwnode);
1765 destroy_workqueue:
1766 fusb302_debugfs_exit(chip);
1767 destroy_workqueue(chip->wq);
1768
1769 return ret;
1770 }
1771
fusb302_remove(struct i2c_client * client)1772 static int fusb302_remove(struct i2c_client *client)
1773 {
1774 struct fusb302_chip *chip = i2c_get_clientdata(client);
1775
1776 disable_irq_wake(chip->gpio_int_n_irq);
1777 free_irq(chip->gpio_int_n_irq, chip);
1778 cancel_work_sync(&chip->irq_work);
1779 cancel_delayed_work_sync(&chip->bc_lvl_handler);
1780 tcpm_unregister_port(chip->tcpm_port);
1781 fwnode_handle_put(chip->tcpc_dev.fwnode);
1782 destroy_workqueue(chip->wq);
1783 fusb302_debugfs_exit(chip);
1784
1785 return 0;
1786 }
1787
fusb302_pm_suspend(struct device * dev)1788 static int fusb302_pm_suspend(struct device *dev)
1789 {
1790 struct fusb302_chip *chip = dev->driver_data;
1791 unsigned long flags;
1792
1793 spin_lock_irqsave(&chip->irq_lock, flags);
1794 chip->irq_suspended = true;
1795 spin_unlock_irqrestore(&chip->irq_lock, flags);
1796
1797 /* Make sure any pending irq_work is finished before the bus suspends */
1798 flush_work(&chip->irq_work);
1799 return 0;
1800 }
1801
fusb302_pm_resume(struct device * dev)1802 static int fusb302_pm_resume(struct device *dev)
1803 {
1804 struct fusb302_chip *chip = dev->driver_data;
1805 unsigned long flags;
1806
1807 spin_lock_irqsave(&chip->irq_lock, flags);
1808 if (chip->irq_while_suspended) {
1809 schedule_work(&chip->irq_work);
1810 chip->irq_while_suspended = false;
1811 }
1812 chip->irq_suspended = false;
1813 spin_unlock_irqrestore(&chip->irq_lock, flags);
1814
1815 return 0;
1816 }
1817
1818 static const struct of_device_id fusb302_dt_match[] = {
1819 {.compatible = "fcs,fusb302"},
1820 {},
1821 };
1822 MODULE_DEVICE_TABLE(of, fusb302_dt_match);
1823
1824 static const struct i2c_device_id fusb302_i2c_device_id[] = {
1825 {"typec_fusb302", 0},
1826 {},
1827 };
1828 MODULE_DEVICE_TABLE(i2c, fusb302_i2c_device_id);
1829
1830 static const struct dev_pm_ops fusb302_pm_ops = {
1831 .suspend = fusb302_pm_suspend,
1832 .resume = fusb302_pm_resume,
1833 };
1834
1835 static struct i2c_driver fusb302_driver = {
1836 .driver = {
1837 .name = "typec_fusb302",
1838 .pm = &fusb302_pm_ops,
1839 .of_match_table = of_match_ptr(fusb302_dt_match),
1840 },
1841 .probe = fusb302_probe,
1842 .remove = fusb302_remove,
1843 .id_table = fusb302_i2c_device_id,
1844 };
1845 module_i2c_driver(fusb302_driver);
1846
1847 MODULE_AUTHOR("Yueyao Zhu <yueyao.zhu@gmail.com>");
1848 MODULE_DESCRIPTION("Fairchild FUSB302 Type-C Chip Driver");
1849 MODULE_LICENSE("GPL");
1850
