2 * Copyright 2016-2017 Google, Inc
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * Fairchild FUSB302 Type-C Chip Driver
17 #include <linux/debugfs.h>
18 #include <linux/delay.h>
19 #include <linux/errno.h>
20 #include <linux/gpio.h>
21 #include <linux/i2c.h>
22 #include <linux/interrupt.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/mutex.h>
26 #include <linux/of_device.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/pinctrl/consumer.h>
30 #include <linux/proc_fs.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/sched/clock.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35 #include <linux/string.h>
36 #include <linux/types.h>
37 #include <linux/usb/typec.h>
38 #include <linux/workqueue.h>
40 #include "fusb302_reg.h"
45 * When the device is SNK, BC_LVL interrupt is used to monitor cc pins
46 * for the current capability offered by the SRC. As FUSB302 chip fires
47 * the BC_LVL interrupt on PD signalings, cc lvl should be handled after
48 * a delay to avoid measuring on PD activities. The delay is slightly
49 * longer than PD_T_PD_DEBPUNCE (10-20ms).
51 #define T_BC_LVL_DEBOUNCE_DELAY_MS 30
60 static const char * const toggling_mode_name[] = {
61 [TOGGLINE_MODE_OFF] = "toggling_OFF",
62 [TOGGLING_MODE_DRP] = "toggling_DRP",
63 [TOGGLING_MODE_SNK] = "toggling_SNK",
64 [TOGGLING_MODE_SRC] = "toggling_SRC",
67 enum src_current_status {
73 static const u8 ra_mda_value[] = {
74 [SRC_CURRENT_DEFAULT] = 4, /* 210mV */
75 [SRC_CURRENT_MEDIUM] = 9, /* 420mV */
76 [SRC_CURRENT_HIGH] = 18, /* 798mV */
79 static const u8 rd_mda_value[] = {
80 [SRC_CURRENT_DEFAULT] = 38, /* 1638mV */
81 [SRC_CURRENT_MEDIUM] = 38, /* 1638mV */
82 [SRC_CURRENT_HIGH] = 61, /* 2604mV */
85 #define LOG_BUFFER_ENTRIES 1024
86 #define LOG_BUFFER_ENTRY_SIZE 128
90 struct i2c_client *i2c_client;
91 struct tcpm_port *tcpm_port;
92 struct tcpc_dev tcpc_dev;
94 struct regulator *vbus;
99 struct workqueue_struct *wq;
100 struct delayed_work bc_lvl_handler;
105 /* lock for sharing chip states */
109 enum toggling_mode toggling_mode;
110 enum src_current_status src_current_status;
121 enum typec_cc_polarity cc_polarity;
122 enum typec_cc_status cc1;
123 enum typec_cc_status cc2;
125 #ifdef CONFIG_DEBUG_FS
126 struct dentry *dentry;
127 /* lock for log buffer access */
128 struct mutex logbuffer_lock;
131 u8 *logbuffer[LOG_BUFFER_ENTRIES];
139 #ifdef CONFIG_DEBUG_FS
141 static bool fusb302_log_full(struct fusb302_chip *chip)
143 return chip->logbuffer_tail ==
144 (chip->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
147 static void _fusb302_log(struct fusb302_chip *chip, const char *fmt,
150 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
151 u64 ts_nsec = local_clock();
152 unsigned long rem_nsec;
154 if (!chip->logbuffer[chip->logbuffer_head]) {
155 chip->logbuffer[chip->logbuffer_head] =
156 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
157 if (!chip->logbuffer[chip->logbuffer_head])
161 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
163 mutex_lock(&chip->logbuffer_lock);
165 if (fusb302_log_full(chip)) {
166 chip->logbuffer_head = max(chip->logbuffer_head - 1, 0);
167 strlcpy(tmpbuffer, "overflow", sizeof(tmpbuffer));
170 if (chip->logbuffer_head < 0 ||
171 chip->logbuffer_head >= LOG_BUFFER_ENTRIES) {
173 "Bad log buffer index %d\n", chip->logbuffer_head);
177 if (!chip->logbuffer[chip->logbuffer_head]) {
179 "Log buffer index %d is NULL\n", chip->logbuffer_head);
183 rem_nsec = do_div(ts_nsec, 1000000000);
184 scnprintf(chip->logbuffer[chip->logbuffer_head],
185 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
186 (unsigned long)ts_nsec, rem_nsec / 1000,
188 chip->logbuffer_head = (chip->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
191 mutex_unlock(&chip->logbuffer_lock);
194 static void fusb302_log(struct fusb302_chip *chip, const char *fmt, ...)
199 _fusb302_log(chip, fmt, args);
203 static int fusb302_seq_show(struct seq_file *s, void *v)
205 struct fusb302_chip *chip = (struct fusb302_chip *)s->private;
208 mutex_lock(&chip->logbuffer_lock);
209 tail = chip->logbuffer_tail;
210 while (tail != chip->logbuffer_head) {
211 seq_printf(s, "%s\n", chip->logbuffer[tail]);
212 tail = (tail + 1) % LOG_BUFFER_ENTRIES;
214 if (!seq_has_overflowed(s))
215 chip->logbuffer_tail = tail;
216 mutex_unlock(&chip->logbuffer_lock);
221 static int fusb302_debug_open(struct inode *inode, struct file *file)
223 return single_open(file, fusb302_seq_show, inode->i_private);
226 static const struct file_operations fusb302_debug_operations = {
227 .open = fusb302_debug_open,
230 .release = single_release,
233 static struct dentry *rootdir;
235 static int fusb302_debugfs_init(struct fusb302_chip *chip)
237 mutex_init(&chip->logbuffer_lock);
239 rootdir = debugfs_create_dir("fusb302", NULL);
244 chip->dentry = debugfs_create_file(dev_name(chip->dev),
245 S_IFREG | 0444, rootdir,
246 chip, &fusb302_debug_operations);
251 static void fusb302_debugfs_exit(struct fusb302_chip *chip)
253 debugfs_remove(chip->dentry);
258 static void fusb302_log(const struct fusb302_chip *chip,
259 const char *fmt, ...) { }
260 static int fusb302_debugfs_init(const struct fusb302_chip *chip) { return 0; }
261 static void fusb302_debugfs_exit(const struct fusb302_chip *chip) { }
265 #define FUSB302_RESUME_RETRY 10
266 #define FUSB302_RESUME_RETRY_SLEEP 50
268 static bool fusb302_is_suspended(struct fusb302_chip *chip)
272 for (retry_cnt = 0; retry_cnt < FUSB302_RESUME_RETRY; retry_cnt++) {
273 if (atomic_read(&chip->pm_suspend)) {
274 dev_err(chip->dev, "i2c: pm suspend, retry %d/%d\n",
275 retry_cnt + 1, FUSB302_RESUME_RETRY);
276 msleep(FUSB302_RESUME_RETRY_SLEEP);
285 static int fusb302_i2c_write(struct fusb302_chip *chip,
290 atomic_set(&chip->i2c_busy, 1);
292 if (fusb302_is_suspended(chip)) {
293 atomic_set(&chip->i2c_busy, 0);
297 ret = i2c_smbus_write_byte_data(chip->i2c_client, address, data);
299 fusb302_log(chip, "cannot write 0x%02x to 0x%02x, ret=%d",
301 atomic_set(&chip->i2c_busy, 0);
306 static int fusb302_i2c_block_write(struct fusb302_chip *chip, u8 address,
307 u8 length, const u8 *data)
313 atomic_set(&chip->i2c_busy, 1);
315 if (fusb302_is_suspended(chip)) {
316 atomic_set(&chip->i2c_busy, 0);
320 ret = i2c_smbus_write_i2c_block_data(chip->i2c_client, address,
323 fusb302_log(chip, "cannot block write 0x%02x, len=%d, ret=%d",
324 address, length, ret);
325 atomic_set(&chip->i2c_busy, 0);
330 static int fusb302_i2c_read(struct fusb302_chip *chip,
331 u8 address, u8 *data)
335 atomic_set(&chip->i2c_busy, 1);
337 if (fusb302_is_suspended(chip)) {
338 atomic_set(&chip->i2c_busy, 0);
342 ret = i2c_smbus_read_byte_data(chip->i2c_client, address);
345 fusb302_log(chip, "cannot read %02x, ret=%d", address, ret);
346 atomic_set(&chip->i2c_busy, 0);
351 static int fusb302_i2c_block_read(struct fusb302_chip *chip, u8 address,
358 atomic_set(&chip->i2c_busy, 1);
360 if (fusb302_is_suspended(chip)) {
361 atomic_set(&chip->i2c_busy, 0);
365 ret = i2c_smbus_read_i2c_block_data(chip->i2c_client, address,
368 fusb302_log(chip, "cannot block read 0x%02x, len=%d, ret=%d",
369 address, length, ret);
373 fusb302_log(chip, "only read %d/%d bytes from 0x%02x",
374 ret, length, address);
379 atomic_set(&chip->i2c_busy, 0);
384 static int fusb302_i2c_mask_write(struct fusb302_chip *chip, u8 address,
390 ret = fusb302_i2c_read(chip, address, &data);
395 ret = fusb302_i2c_write(chip, address, data);
402 static int fusb302_i2c_set_bits(struct fusb302_chip *chip, u8 address,
405 return fusb302_i2c_mask_write(chip, address, 0x00, set_bits);
408 static int fusb302_i2c_clear_bits(struct fusb302_chip *chip, u8 address,
411 return fusb302_i2c_mask_write(chip, address, clear_bits, 0x00);
414 static int fusb302_sw_reset(struct fusb302_chip *chip)
418 ret = fusb302_i2c_write(chip, FUSB_REG_RESET,
419 FUSB_REG_RESET_SW_RESET);
421 fusb302_log(chip, "cannot sw reset the chip, ret=%d", ret);
423 fusb302_log(chip, "sw reset");
428 static int fusb302_enable_tx_auto_retries(struct fusb302_chip *chip)
432 ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3,
433 FUSB_REG_CONTROL3_N_RETRIES_3 |
434 FUSB_REG_CONTROL3_AUTO_RETRY);
440 * initialize interrupt on the chip
441 * - unmasked interrupt: VBUS_OK
443 static int fusb302_init_interrupt(struct fusb302_chip *chip)
447 ret = fusb302_i2c_write(chip, FUSB_REG_MASK,
448 0xFF & ~FUSB_REG_MASK_VBUSOK);
451 ret = fusb302_i2c_write(chip, FUSB_REG_MASKA, 0xFF);
454 ret = fusb302_i2c_write(chip, FUSB_REG_MASKB, 0xFF);
457 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_CONTROL0,
458 FUSB_REG_CONTROL0_INT_MASK);
465 static int fusb302_set_power_mode(struct fusb302_chip *chip, u8 power_mode)
469 ret = fusb302_i2c_write(chip, FUSB_REG_POWER, power_mode);
474 static int tcpm_init(struct tcpc_dev *dev)
476 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
481 ret = fusb302_sw_reset(chip);
484 ret = fusb302_enable_tx_auto_retries(chip);
487 ret = fusb302_init_interrupt(chip);
490 ret = fusb302_set_power_mode(chip, FUSB_REG_POWER_PWR_ALL);
493 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &data);
496 chip->vbus_present = !!(data & FUSB_REG_STATUS0_VBUSOK);
497 ret = fusb302_i2c_read(chip, FUSB_REG_DEVICE_ID, &data);
500 fusb302_log(chip, "fusb302 device ID: 0x%02x", data);
505 static int tcpm_get_vbus(struct tcpc_dev *dev)
507 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
511 mutex_lock(&chip->lock);
512 ret = chip->vbus_present ? 1 : 0;
513 mutex_unlock(&chip->lock);
518 static int fusb302_set_cc_pull(struct fusb302_chip *chip,
519 bool pull_up, bool pull_down)
523 u8 mask = FUSB_REG_SWITCHES0_CC1_PU_EN |
524 FUSB_REG_SWITCHES0_CC2_PU_EN |
525 FUSB_REG_SWITCHES0_CC1_PD_EN |
526 FUSB_REG_SWITCHES0_CC2_PD_EN;
529 data |= (chip->cc_polarity == TYPEC_POLARITY_CC1) ?
530 FUSB_REG_SWITCHES0_CC1_PU_EN :
531 FUSB_REG_SWITCHES0_CC2_PU_EN;
533 data |= FUSB_REG_SWITCHES0_CC1_PD_EN |
534 FUSB_REG_SWITCHES0_CC2_PD_EN;
535 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0,
539 chip->pull_up = pull_up;
544 static int fusb302_set_src_current(struct fusb302_chip *chip,
545 enum src_current_status status)
549 chip->src_current_status = status;
551 case SRC_CURRENT_DEFAULT:
552 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0,
553 FUSB_REG_CONTROL0_HOST_CUR_MASK,
554 FUSB_REG_CONTROL0_HOST_CUR_DEF);
556 case SRC_CURRENT_MEDIUM:
557 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0,
558 FUSB_REG_CONTROL0_HOST_CUR_MASK,
559 FUSB_REG_CONTROL0_HOST_CUR_MED);
561 case SRC_CURRENT_HIGH:
562 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0,
563 FUSB_REG_CONTROL0_HOST_CUR_MASK,
564 FUSB_REG_CONTROL0_HOST_CUR_HIGH);
573 static int fusb302_set_toggling(struct fusb302_chip *chip,
574 enum toggling_mode mode)
578 /* first disable toggling */
579 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_CONTROL2,
580 FUSB_REG_CONTROL2_TOGGLE);
583 /* mask interrupts for SRC or SNK */
584 ret = fusb302_i2c_set_bits(chip, FUSB_REG_MASK,
585 FUSB_REG_MASK_BC_LVL |
586 FUSB_REG_MASK_COMP_CHNG);
589 chip->intr_bc_lvl = false;
590 chip->intr_comp_chng = false;
591 /* configure toggling mode: none/snk/src/drp */
593 case TOGGLINE_MODE_OFF:
594 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
595 FUSB_REG_CONTROL2_MODE_MASK,
596 FUSB_REG_CONTROL2_MODE_NONE);
600 case TOGGLING_MODE_SNK:
601 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
602 FUSB_REG_CONTROL2_MODE_MASK,
603 FUSB_REG_CONTROL2_MODE_UFP);
607 case TOGGLING_MODE_SRC:
608 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
609 FUSB_REG_CONTROL2_MODE_MASK,
610 FUSB_REG_CONTROL2_MODE_DFP);
614 case TOGGLING_MODE_DRP:
615 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2,
616 FUSB_REG_CONTROL2_MODE_MASK,
617 FUSB_REG_CONTROL2_MODE_DRP);
625 if (mode == TOGGLINE_MODE_OFF) {
626 /* mask TOGDONE interrupt */
627 ret = fusb302_i2c_set_bits(chip, FUSB_REG_MASKA,
628 FUSB_REG_MASKA_TOGDONE);
631 chip->intr_togdone = false;
633 /* unmask TOGDONE interrupt */
634 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA,
635 FUSB_REG_MASKA_TOGDONE);
638 chip->intr_togdone = true;
640 ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL2,
641 FUSB_REG_CONTROL2_TOGGLE);
644 /* during toggling, consider cc as Open */
645 chip->cc1 = TYPEC_CC_OPEN;
646 chip->cc2 = TYPEC_CC_OPEN;
648 chip->toggling_mode = mode;
653 static const char * const typec_cc_status_name[] = {
654 [TYPEC_CC_OPEN] = "Open",
655 [TYPEC_CC_RA] = "Ra",
656 [TYPEC_CC_RD] = "Rd",
657 [TYPEC_CC_RP_DEF] = "Rp-def",
658 [TYPEC_CC_RP_1_5] = "Rp-1.5",
659 [TYPEC_CC_RP_3_0] = "Rp-3.0",
662 static const enum src_current_status cc_src_current[] = {
663 [TYPEC_CC_OPEN] = SRC_CURRENT_DEFAULT,
664 [TYPEC_CC_RA] = SRC_CURRENT_DEFAULT,
665 [TYPEC_CC_RD] = SRC_CURRENT_DEFAULT,
666 [TYPEC_CC_RP_DEF] = SRC_CURRENT_DEFAULT,
667 [TYPEC_CC_RP_1_5] = SRC_CURRENT_MEDIUM,
668 [TYPEC_CC_RP_3_0] = SRC_CURRENT_HIGH,
671 static int tcpm_set_cc(struct tcpc_dev *dev, enum typec_cc_status cc)
673 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
676 bool pull_up, pull_down;
679 mutex_lock(&chip->lock);
689 case TYPEC_CC_RP_DEF:
690 case TYPEC_CC_RP_1_5:
691 case TYPEC_CC_RP_3_0:
696 fusb302_log(chip, "unsupported cc value %s",
697 typec_cc_status_name[cc]);
701 ret = fusb302_set_toggling(chip, TOGGLINE_MODE_OFF);
703 fusb302_log(chip, "cannot stop toggling, ret=%d", ret);
706 ret = fusb302_set_cc_pull(chip, pull_up, pull_down);
709 "cannot set cc pulling up %s, down %s, ret = %d",
710 pull_up ? "True" : "False",
711 pull_down ? "True" : "False",
715 /* reset the cc status */
716 chip->cc1 = TYPEC_CC_OPEN;
717 chip->cc2 = TYPEC_CC_OPEN;
718 /* adjust current for SRC */
720 ret = fusb302_set_src_current(chip, cc_src_current[cc]);
722 fusb302_log(chip, "cannot set src current %s, ret=%d",
723 typec_cc_status_name[cc], ret);
727 /* enable/disable interrupts, BC_LVL for SNK and COMP_CHNG for SRC */
729 rd_mda = rd_mda_value[cc_src_current[cc]];
730 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda);
733 "cannot set SRC measure value, ret=%d",
737 ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK,
738 FUSB_REG_MASK_BC_LVL |
739 FUSB_REG_MASK_COMP_CHNG,
740 FUSB_REG_MASK_COMP_CHNG);
742 fusb302_log(chip, "cannot set SRC interrupt, ret=%d",
746 chip->intr_bc_lvl = false;
747 chip->intr_comp_chng = true;
750 ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK,
751 FUSB_REG_MASK_BC_LVL |
752 FUSB_REG_MASK_COMP_CHNG,
753 FUSB_REG_MASK_BC_LVL);
755 fusb302_log(chip, "cannot set SRC interrupt, ret=%d",
759 chip->intr_bc_lvl = true;
760 chip->intr_comp_chng = false;
762 fusb302_log(chip, "cc := %s", typec_cc_status_name[cc]);
764 mutex_unlock(&chip->lock);
769 static int tcpm_get_cc(struct tcpc_dev *dev, enum typec_cc_status *cc1,
770 enum typec_cc_status *cc2)
772 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
775 mutex_lock(&chip->lock);
778 fusb302_log(chip, "cc1=%s, cc2=%s", typec_cc_status_name[*cc1],
779 typec_cc_status_name[*cc2]);
780 mutex_unlock(&chip->lock);
785 static int tcpm_set_polarity(struct tcpc_dev *dev,
786 enum typec_cc_polarity polarity)
791 static int tcpm_set_vconn(struct tcpc_dev *dev, bool on)
793 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
796 u8 switches0_data = 0x00;
797 u8 switches0_mask = FUSB_REG_SWITCHES0_VCONN_CC1 |
798 FUSB_REG_SWITCHES0_VCONN_CC2;
800 mutex_lock(&chip->lock);
801 if (chip->vconn_on == on) {
802 fusb302_log(chip, "vconn is already %s", on ? "On" : "Off");
806 switches0_data = (chip->cc_polarity == TYPEC_POLARITY_CC1) ?
807 FUSB_REG_SWITCHES0_VCONN_CC2 :
808 FUSB_REG_SWITCHES0_VCONN_CC1;
810 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0,
811 switches0_mask, switches0_data);
815 fusb302_log(chip, "vconn := %s", on ? "On" : "Off");
817 mutex_unlock(&chip->lock);
822 static int tcpm_set_vbus(struct tcpc_dev *dev, bool on, bool charge)
824 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
828 mutex_lock(&chip->lock);
829 if (chip->vbus_on == on) {
830 fusb302_log(chip, "vbus is already %s", on ? "On" : "Off");
833 ret = regulator_enable(chip->vbus);
835 ret = regulator_disable(chip->vbus);
837 fusb302_log(chip, "cannot %s vbus regulator, ret=%d",
838 on ? "enable" : "disable", ret);
842 fusb302_log(chip, "vbus := %s", on ? "On" : "Off");
844 if (chip->charge_on == charge)
845 fusb302_log(chip, "charge is already %s",
846 charge ? "On" : "Off");
848 chip->charge_on = charge;
851 mutex_unlock(&chip->lock);
856 static int tcpm_set_current_limit(struct tcpc_dev *dev, u32 max_ma, u32 mv)
858 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
861 fusb302_log(chip, "current limit: %d ma, %d mv (not implemented)",
867 static int fusb302_pd_tx_flush(struct fusb302_chip *chip)
869 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL0,
870 FUSB_REG_CONTROL0_TX_FLUSH);
873 static int fusb302_pd_rx_flush(struct fusb302_chip *chip)
875 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL1,
876 FUSB_REG_CONTROL1_RX_FLUSH);
879 static int fusb302_pd_set_auto_goodcrc(struct fusb302_chip *chip, bool on)
882 return fusb302_i2c_set_bits(chip, FUSB_REG_SWITCHES1,
883 FUSB_REG_SWITCHES1_AUTO_GCRC);
884 return fusb302_i2c_clear_bits(chip, FUSB_REG_SWITCHES1,
885 FUSB_REG_SWITCHES1_AUTO_GCRC);
888 static int fusb302_pd_set_interrupts(struct fusb302_chip *chip, bool on)
891 u8 mask_interrupts = FUSB_REG_MASK_COLLISION;
892 u8 maska_interrupts = FUSB_REG_MASKA_RETRYFAIL |
893 FUSB_REG_MASKA_HARDSENT |
894 FUSB_REG_MASKA_TX_SUCCESS |
895 FUSB_REG_MASKA_HARDRESET;
896 u8 maskb_interrupts = FUSB_REG_MASKB_GCRCSENT;
899 fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, mask_interrupts) :
900 fusb302_i2c_set_bits(chip, FUSB_REG_MASK, mask_interrupts);
904 fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA, maska_interrupts) :
905 fusb302_i2c_set_bits(chip, FUSB_REG_MASKA, maska_interrupts);
909 fusb302_i2c_clear_bits(chip, FUSB_REG_MASKB, maskb_interrupts) :
910 fusb302_i2c_set_bits(chip, FUSB_REG_MASKB, maskb_interrupts);
914 static int tcpm_set_pd_rx(struct tcpc_dev *dev, bool on)
916 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
920 mutex_lock(&chip->lock);
921 ret = fusb302_pd_rx_flush(chip);
923 fusb302_log(chip, "cannot flush pd rx buffer, ret=%d", ret);
926 ret = fusb302_pd_tx_flush(chip);
928 fusb302_log(chip, "cannot flush pd tx buffer, ret=%d", ret);
931 ret = fusb302_pd_set_auto_goodcrc(chip, on);
933 fusb302_log(chip, "cannot turn %s auto GCRC, ret=%d",
934 on ? "on" : "off", ret);
937 ret = fusb302_pd_set_interrupts(chip, on);
939 fusb302_log(chip, "cannot turn %s pd interrupts, ret=%d",
940 on ? "on" : "off", ret);
943 fusb302_log(chip, "pd := %s", on ? "on" : "off");
945 mutex_unlock(&chip->lock);
950 static const char * const typec_role_name[] = {
951 [TYPEC_SINK] = "Sink",
952 [TYPEC_SOURCE] = "Source",
955 static const char * const typec_data_role_name[] = {
956 [TYPEC_DEVICE] = "Device",
957 [TYPEC_HOST] = "Host",
960 static int tcpm_set_roles(struct tcpc_dev *dev, bool attached,
961 enum typec_role pwr, enum typec_data_role data)
963 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
966 u8 switches1_mask = FUSB_REG_SWITCHES1_POWERROLE |
967 FUSB_REG_SWITCHES1_DATAROLE;
968 u8 switches1_data = 0x00;
970 mutex_lock(&chip->lock);
971 if (pwr == TYPEC_SOURCE)
972 switches1_data |= FUSB_REG_SWITCHES1_POWERROLE;
973 if (data == TYPEC_HOST)
974 switches1_data |= FUSB_REG_SWITCHES1_DATAROLE;
975 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES1,
976 switches1_mask, switches1_data);
978 fusb302_log(chip, "unable to set pd header %s, %s, ret=%d",
979 typec_role_name[pwr], typec_data_role_name[data],
983 fusb302_log(chip, "pd header := %s, %s", typec_role_name[pwr],
984 typec_data_role_name[data]);
986 mutex_unlock(&chip->lock);
991 static int tcpm_start_drp_toggling(struct tcpc_dev *dev,
992 enum typec_cc_status cc)
994 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
998 mutex_lock(&chip->lock);
999 ret = fusb302_set_src_current(chip, cc_src_current[cc]);
1001 fusb302_log(chip, "unable to set src current %s, ret=%d",
1002 typec_cc_status_name[cc], ret);
1005 ret = fusb302_set_toggling(chip, TOGGLING_MODE_DRP);
1008 "unable to start drp toggling, ret=%d", ret);
1011 fusb302_log(chip, "start drp toggling");
1013 mutex_unlock(&chip->lock);
1018 static int fusb302_pd_send_message(struct fusb302_chip *chip,
1019 const struct pd_message *msg)
1027 buf[pos++] = FUSB302_TKN_SYNC1;
1028 buf[pos++] = FUSB302_TKN_SYNC1;
1029 buf[pos++] = FUSB302_TKN_SYNC1;
1030 buf[pos++] = FUSB302_TKN_SYNC2;
1032 len = pd_header_cnt_le(msg->header) * 4;
1033 /* plug 2 for header */
1037 "PD message too long %d (incl. header)", len);
1040 /* packsym tells the FUSB302 chip that the next X bytes are payload */
1041 buf[pos++] = FUSB302_TKN_PACKSYM | (len & 0x1F);
1042 buf[pos++] = msg->header & 0xFF;
1043 buf[pos++] = (msg->header >> 8) & 0xFF;
1046 memcpy(&buf[pos], msg->payload, len);
1050 buf[pos++] = FUSB302_TKN_JAMCRC;
1052 buf[pos++] = FUSB302_TKN_EOP;
1053 /* turn tx off after sending message */
1054 buf[pos++] = FUSB302_TKN_TXOFF;
1055 /* start transmission */
1056 buf[pos++] = FUSB302_TKN_TXON;
1058 ret = fusb302_i2c_block_write(chip, FUSB_REG_FIFOS, pos, buf);
1061 fusb302_log(chip, "sending PD message header: %x", msg->header);
1062 fusb302_log(chip, "sending PD message len: %d", len);
1067 static int fusb302_pd_send_hardreset(struct fusb302_chip *chip)
1069 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3,
1070 FUSB_REG_CONTROL3_SEND_HARDRESET);
1073 static const char * const transmit_type_name[] = {
1074 [TCPC_TX_SOP] = "SOP",
1075 [TCPC_TX_SOP_PRIME] = "SOP'",
1076 [TCPC_TX_SOP_PRIME_PRIME] = "SOP''",
1077 [TCPC_TX_SOP_DEBUG_PRIME] = "DEBUG'",
1078 [TCPC_TX_SOP_DEBUG_PRIME_PRIME] = "DEBUG''",
1079 [TCPC_TX_HARD_RESET] = "HARD_RESET",
1080 [TCPC_TX_CABLE_RESET] = "CABLE_RESET",
1081 [TCPC_TX_BIST_MODE_2] = "BIST_MODE_2",
1084 static int tcpm_pd_transmit(struct tcpc_dev *dev, enum tcpm_transmit_type type,
1085 const struct pd_message *msg)
1087 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
1091 mutex_lock(&chip->lock);
1094 ret = fusb302_pd_send_message(chip, msg);
1097 "cannot send PD message, ret=%d", ret);
1099 case TCPC_TX_HARD_RESET:
1100 ret = fusb302_pd_send_hardreset(chip);
1103 "cannot send hardreset, ret=%d", ret);
1106 fusb302_log(chip, "type %s not supported",
1107 transmit_type_name[type]);
1110 mutex_unlock(&chip->lock);
1115 static enum typec_cc_status fusb302_bc_lvl_to_cc(u8 bc_lvl)
1117 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_1230_MAX)
1118 return TYPEC_CC_RP_3_0;
1119 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_600_1230)
1120 return TYPEC_CC_RP_1_5;
1121 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_200_600)
1122 return TYPEC_CC_RP_DEF;
1123 return TYPEC_CC_OPEN;
1126 static void fusb302_bc_lvl_handler_work(struct work_struct *work)
1128 struct fusb302_chip *chip = container_of(work, struct fusb302_chip,
1129 bc_lvl_handler.work);
1133 enum typec_cc_status cc_status;
1135 mutex_lock(&chip->lock);
1136 if (!chip->intr_bc_lvl) {
1137 fusb302_log(chip, "BC_LVL interrupt is turned off, abort");
1140 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1143 fusb302_log(chip, "BC_LVL handler, status0=0x%02x", status0);
1144 if (status0 & FUSB_REG_STATUS0_ACTIVITY) {
1145 fusb302_log(chip, "CC activities detected, delay handling");
1146 mod_delayed_work(chip->wq, &chip->bc_lvl_handler,
1147 msecs_to_jiffies(T_BC_LVL_DEBOUNCE_DELAY_MS));
1150 bc_lvl = status0 & FUSB_REG_STATUS0_BC_LVL_MASK;
1151 cc_status = fusb302_bc_lvl_to_cc(bc_lvl);
1152 if (chip->cc_polarity == TYPEC_POLARITY_CC1) {
1153 if (chip->cc1 != cc_status) {
1154 fusb302_log(chip, "cc1: %s -> %s",
1155 typec_cc_status_name[chip->cc1],
1156 typec_cc_status_name[cc_status]);
1157 chip->cc1 = cc_status;
1158 tcpm_cc_change(chip->tcpm_port);
1161 if (chip->cc2 != cc_status) {
1162 fusb302_log(chip, "cc2: %s -> %s",
1163 typec_cc_status_name[chip->cc2],
1164 typec_cc_status_name[cc_status]);
1165 chip->cc2 = cc_status;
1166 tcpm_cc_change(chip->tcpm_port);
1171 mutex_unlock(&chip->lock);
1174 #define PDO_FIXED_FLAGS \
1175 (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | PDO_FIXED_USB_COMM)
1177 static const u32 src_pdo[] = {
1178 PDO_FIXED(5000, 400, PDO_FIXED_FLAGS),
1181 static const u32 snk_pdo[] = {
1182 PDO_FIXED(5000, 400, PDO_FIXED_FLAGS),
1185 static const struct tcpc_config fusb302_tcpc_config = {
1187 .nr_src_pdo = ARRAY_SIZE(src_pdo),
1189 .nr_snk_pdo = ARRAY_SIZE(snk_pdo),
1192 .max_snk_mw = 27000,
1193 .operating_snk_mw = 2500,
1194 .type = TYPEC_PORT_DRP,
1195 .default_role = TYPEC_SINK,
1199 static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev)
1201 fusb302_tcpc_dev->config = &fusb302_tcpc_config;
1202 fusb302_tcpc_dev->init = tcpm_init;
1203 fusb302_tcpc_dev->get_vbus = tcpm_get_vbus;
1204 fusb302_tcpc_dev->set_cc = tcpm_set_cc;
1205 fusb302_tcpc_dev->get_cc = tcpm_get_cc;
1206 fusb302_tcpc_dev->set_polarity = tcpm_set_polarity;
1207 fusb302_tcpc_dev->set_vconn = tcpm_set_vconn;
1208 fusb302_tcpc_dev->set_vbus = tcpm_set_vbus;
1209 fusb302_tcpc_dev->set_current_limit = tcpm_set_current_limit;
1210 fusb302_tcpc_dev->set_pd_rx = tcpm_set_pd_rx;
1211 fusb302_tcpc_dev->set_roles = tcpm_set_roles;
1212 fusb302_tcpc_dev->start_drp_toggling = tcpm_start_drp_toggling;
1213 fusb302_tcpc_dev->pd_transmit = tcpm_pd_transmit;
1214 fusb302_tcpc_dev->mux = NULL;
1217 static const char * const cc_polarity_name[] = {
1218 [TYPEC_POLARITY_CC1] = "Polarity_CC1",
1219 [TYPEC_POLARITY_CC2] = "Polarity_CC2",
1222 static int fusb302_set_cc_polarity(struct fusb302_chip *chip,
1223 enum typec_cc_polarity cc_polarity)
1226 u8 switches0_mask = FUSB_REG_SWITCHES0_CC1_PU_EN |
1227 FUSB_REG_SWITCHES0_CC2_PU_EN |
1228 FUSB_REG_SWITCHES0_VCONN_CC1 |
1229 FUSB_REG_SWITCHES0_VCONN_CC2 |
1230 FUSB_REG_SWITCHES0_MEAS_CC1 |
1231 FUSB_REG_SWITCHES0_MEAS_CC2;
1232 u8 switches0_data = 0x00;
1233 u8 switches1_mask = FUSB_REG_SWITCHES1_TXCC1_EN |
1234 FUSB_REG_SWITCHES1_TXCC2_EN;
1235 u8 switches1_data = 0x00;
1237 if (cc_polarity == TYPEC_POLARITY_CC1) {
1238 switches0_data = FUSB_REG_SWITCHES0_MEAS_CC1;
1240 switches0_data |= FUSB_REG_SWITCHES0_VCONN_CC2;
1242 switches0_data |= FUSB_REG_SWITCHES0_CC1_PU_EN;
1243 switches1_data = FUSB_REG_SWITCHES1_TXCC1_EN;
1245 switches0_data = FUSB_REG_SWITCHES0_MEAS_CC2;
1247 switches0_data |= FUSB_REG_SWITCHES0_VCONN_CC1;
1249 switches0_data |= FUSB_REG_SWITCHES0_CC2_PU_EN;
1250 switches1_data = FUSB_REG_SWITCHES1_TXCC2_EN;
1252 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0,
1253 switches0_mask, switches0_data);
1256 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES1,
1257 switches1_mask, switches1_data);
1260 chip->cc_polarity = cc_polarity;
1265 static int fusb302_handle_togdone_snk(struct fusb302_chip *chip,
1271 enum typec_cc_polarity cc_polarity;
1272 enum typec_cc_status cc_status_active, cc1, cc2;
1274 /* set pull_up, pull_down */
1275 ret = fusb302_set_cc_pull(chip, false, true);
1277 fusb302_log(chip, "cannot set cc to pull down, ret=%d", ret);
1281 cc_polarity = (togdone_result == FUSB_REG_STATUS1A_TOGSS_SNK1) ?
1282 TYPEC_POLARITY_CC1 : TYPEC_POLARITY_CC2;
1283 ret = fusb302_set_cc_polarity(chip, cc_polarity);
1285 fusb302_log(chip, "cannot set cc polarity %s, ret=%d",
1286 cc_polarity_name[cc_polarity], ret);
1289 /* fusb302_set_cc_polarity() has set the correct measure block */
1290 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1293 bc_lvl = status0 & FUSB_REG_STATUS0_BC_LVL_MASK;
1294 cc_status_active = fusb302_bc_lvl_to_cc(bc_lvl);
1295 /* restart toggling if the cc status on the active line is OPEN */
1296 if (cc_status_active == TYPEC_CC_OPEN) {
1297 fusb302_log(chip, "restart toggling as CC_OPEN detected");
1298 ret = fusb302_set_toggling(chip, chip->toggling_mode);
1301 /* update tcpm with the new cc value */
1302 cc1 = (cc_polarity == TYPEC_POLARITY_CC1) ?
1303 cc_status_active : TYPEC_CC_OPEN;
1304 cc2 = (cc_polarity == TYPEC_POLARITY_CC2) ?
1305 cc_status_active : TYPEC_CC_OPEN;
1306 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) {
1309 tcpm_cc_change(chip->tcpm_port);
1311 /* turn off toggling */
1312 ret = fusb302_set_toggling(chip, TOGGLINE_MODE_OFF);
1315 "cannot set toggling mode off, ret=%d", ret);
1318 /* unmask bc_lvl interrupt */
1319 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, FUSB_REG_MASK_BC_LVL);
1322 "cannot unmask bc_lcl interrupt, ret=%d", ret);
1325 chip->intr_bc_lvl = true;
1326 fusb302_log(chip, "detected cc1=%s, cc2=%s",
1327 typec_cc_status_name[cc1],
1328 typec_cc_status_name[cc2]);
1333 static int fusb302_handle_togdone_src(struct fusb302_chip *chip,
1337 * - set polarity (measure cc, vconn, tx)
1338 * - set pull_up, pull_down
1339 * - set cc1, cc2, and update to tcpm_port
1340 * - set I_COMP interrupt on
1344 u8 ra_mda = ra_mda_value[chip->src_current_status];
1345 u8 rd_mda = rd_mda_value[chip->src_current_status];
1346 bool ra_comp, rd_comp;
1347 enum typec_cc_polarity cc_polarity;
1348 enum typec_cc_status cc_status_active, cc1, cc2;
1350 /* set pull_up, pull_down */
1351 ret = fusb302_set_cc_pull(chip, true, false);
1353 fusb302_log(chip, "cannot set cc to pull up, ret=%d", ret);
1357 cc_polarity = (togdone_result == FUSB_REG_STATUS1A_TOGSS_SRC1) ?
1358 TYPEC_POLARITY_CC1 : TYPEC_POLARITY_CC2;
1359 ret = fusb302_set_cc_polarity(chip, cc_polarity);
1361 fusb302_log(chip, "cannot set cc polarity %s, ret=%d",
1362 cc_polarity_name[cc_polarity], ret);
1365 /* fusb302_set_cc_polarity() has set the correct measure block */
1366 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda);
1369 usleep_range(50, 100);
1370 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1373 rd_comp = !!(status0 & FUSB_REG_STATUS0_COMP);
1375 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, ra_mda);
1378 usleep_range(50, 100);
1379 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1382 ra_comp = !!(status0 & FUSB_REG_STATUS0_COMP);
1385 cc_status_active = TYPEC_CC_OPEN;
1387 cc_status_active = TYPEC_CC_RD;
1389 /* Ra is not supported, report as Open */
1390 cc_status_active = TYPEC_CC_OPEN;
1391 /* restart toggling if the cc status on the active line is OPEN */
1392 if (cc_status_active == TYPEC_CC_OPEN) {
1393 fusb302_log(chip, "restart toggling as CC_OPEN detected");
1394 ret = fusb302_set_toggling(chip, chip->toggling_mode);
1397 /* update tcpm with the new cc value */
1398 cc1 = (cc_polarity == TYPEC_POLARITY_CC1) ?
1399 cc_status_active : TYPEC_CC_OPEN;
1400 cc2 = (cc_polarity == TYPEC_POLARITY_CC2) ?
1401 cc_status_active : TYPEC_CC_OPEN;
1402 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) {
1405 tcpm_cc_change(chip->tcpm_port);
1407 /* turn off toggling */
1408 ret = fusb302_set_toggling(chip, TOGGLINE_MODE_OFF);
1411 "cannot set toggling mode off, ret=%d", ret);
1414 /* set MDAC to Rd threshold, and unmask I_COMP for unplug detection */
1415 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda);
1418 /* unmask comp_chng interrupt */
1419 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK,
1420 FUSB_REG_MASK_COMP_CHNG);
1423 "cannot unmask bc_lcl interrupt, ret=%d", ret);
1426 chip->intr_comp_chng = true;
1427 fusb302_log(chip, "detected cc1=%s, cc2=%s",
1428 typec_cc_status_name[cc1],
1429 typec_cc_status_name[cc2]);
1434 static int fusb302_handle_togdone(struct fusb302_chip *chip)
1440 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS1A, &status1a);
1443 togdone_result = (status1a >> FUSB_REG_STATUS1A_TOGSS_POS) &
1444 FUSB_REG_STATUS1A_TOGSS_MASK;
1445 switch (togdone_result) {
1446 case FUSB_REG_STATUS1A_TOGSS_SNK1:
1447 case FUSB_REG_STATUS1A_TOGSS_SNK2:
1448 return fusb302_handle_togdone_snk(chip, togdone_result);
1449 case FUSB_REG_STATUS1A_TOGSS_SRC1:
1450 case FUSB_REG_STATUS1A_TOGSS_SRC2:
1451 return fusb302_handle_togdone_src(chip, togdone_result);
1452 case FUSB_REG_STATUS1A_TOGSS_AA:
1453 /* doesn't support */
1454 fusb302_log(chip, "AudioAccessory not supported");
1455 fusb302_set_toggling(chip, chip->toggling_mode);
1458 fusb302_log(chip, "TOGDONE with an invalid state: %d",
1460 fusb302_set_toggling(chip, chip->toggling_mode);
1466 static int fusb302_pd_reset(struct fusb302_chip *chip)
1468 return fusb302_i2c_set_bits(chip, FUSB_REG_RESET,
1469 FUSB_REG_RESET_PD_RESET);
1472 static int fusb302_pd_read_message(struct fusb302_chip *chip,
1473 struct pd_message *msg)
1480 /* first SOP token */
1481 ret = fusb302_i2c_read(chip, FUSB_REG_FIFOS, &token);
1484 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, 2,
1485 (u8 *)&msg->header);
1488 len = pd_header_cnt_le(msg->header) * 4;
1489 /* add 4 to length to include the CRC */
1490 if (len > PD_MAX_PAYLOAD * 4) {
1491 fusb302_log(chip, "PD message too long %d", len);
1495 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, len,
1496 (u8 *)msg->payload);
1500 /* another 4 bytes to read CRC out */
1501 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, 4, crc);
1504 fusb302_log(chip, "PD message header: %x", msg->header);
1505 fusb302_log(chip, "PD message len: %d", len);
1510 static irqreturn_t fusb302_irq_intn(int irq, void *dev_id)
1512 struct fusb302_chip *chip = dev_id;
1522 bool intr_comp_chng;
1523 struct pd_message pd_msg;
1525 mutex_lock(&chip->lock);
1526 /* grab a snapshot of intr flags */
1527 intr_togdone = chip->intr_togdone;
1528 intr_bc_lvl = chip->intr_bc_lvl;
1529 intr_comp_chng = chip->intr_comp_chng;
1531 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPT, &interrupt);
1534 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPTA, &interrupta);
1537 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPTB, &interruptb);
1540 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0);
1544 "IRQ: 0x%02x, a: 0x%02x, b: 0x%02x, status0: 0x%02x",
1545 interrupt, interrupta, interruptb, status0);
1547 if (interrupt & FUSB_REG_INTERRUPT_VBUSOK) {
1548 vbus_present = !!(status0 & FUSB_REG_STATUS0_VBUSOK);
1549 fusb302_log(chip, "IRQ: VBUS_OK, vbus=%s",
1550 vbus_present ? "On" : "Off");
1551 if (vbus_present != chip->vbus_present) {
1552 chip->vbus_present = vbus_present;
1553 tcpm_vbus_change(chip->tcpm_port);
1557 if ((interrupta & FUSB_REG_INTERRUPTA_TOGDONE) && intr_togdone) {
1558 fusb302_log(chip, "IRQ: TOGDONE");
1559 ret = fusb302_handle_togdone(chip);
1562 "handle togdone error, ret=%d", ret);
1567 if ((interrupt & FUSB_REG_INTERRUPT_BC_LVL) && intr_bc_lvl) {
1568 fusb302_log(chip, "IRQ: BC_LVL, handler pending");
1570 * as BC_LVL interrupt can be affected by PD activity,
1571 * apply delay to for the handler to wait for the PD
1572 * signaling to finish.
1574 mod_delayed_work(chip->wq, &chip->bc_lvl_handler,
1575 msecs_to_jiffies(T_BC_LVL_DEBOUNCE_DELAY_MS));
1578 if ((interrupt & FUSB_REG_INTERRUPT_COMP_CHNG) && intr_comp_chng) {
1579 comp_result = !!(status0 & FUSB_REG_STATUS0_COMP);
1580 fusb302_log(chip, "IRQ: COMP_CHNG, comp=%s",
1581 comp_result ? "true" : "false");
1583 /* cc level > Rd_threashold, detach */
1584 if (chip->cc_polarity == TYPEC_POLARITY_CC1)
1585 chip->cc1 = TYPEC_CC_OPEN;
1587 chip->cc2 = TYPEC_CC_OPEN;
1588 tcpm_cc_change(chip->tcpm_port);
1592 if (interrupt & FUSB_REG_INTERRUPT_COLLISION) {
1593 fusb302_log(chip, "IRQ: PD collision");
1594 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_FAILED);
1597 if (interrupta & FUSB_REG_INTERRUPTA_RETRYFAIL) {
1598 fusb302_log(chip, "IRQ: PD retry failed");
1599 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_FAILED);
1602 if (interrupta & FUSB_REG_INTERRUPTA_HARDSENT) {
1603 fusb302_log(chip, "IRQ: PD hardreset sent");
1604 ret = fusb302_pd_reset(chip);
1606 fusb302_log(chip, "cannot PD reset, ret=%d", ret);
1609 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS);
1612 if (interrupta & FUSB_REG_INTERRUPTA_TX_SUCCESS) {
1613 fusb302_log(chip, "IRQ: PD tx success");
1614 /* read out the received good CRC */
1615 ret = fusb302_pd_read_message(chip, &pd_msg);
1617 fusb302_log(chip, "cannot read in GCRC, ret=%d", ret);
1620 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS);
1623 if (interrupta & FUSB_REG_INTERRUPTA_HARDRESET) {
1624 fusb302_log(chip, "IRQ: PD received hardreset");
1625 ret = fusb302_pd_reset(chip);
1627 fusb302_log(chip, "cannot PD reset, ret=%d", ret);
1630 tcpm_pd_hard_reset(chip->tcpm_port);
1633 if (interruptb & FUSB_REG_INTERRUPTB_GCRCSENT) {
1634 fusb302_log(chip, "IRQ: PD sent good CRC");
1635 ret = fusb302_pd_read_message(chip, &pd_msg);
1638 "cannot read in PD message, ret=%d", ret);
1641 tcpm_pd_receive(chip->tcpm_port, &pd_msg);
1644 mutex_unlock(&chip->lock);
1649 static int init_gpio(struct fusb302_chip *chip)
1651 struct device_node *node;
1654 node = chip->dev->of_node;
1655 chip->gpio_int_n = of_get_named_gpio(node, "fcs,int_n", 0);
1656 if (!gpio_is_valid(chip->gpio_int_n)) {
1657 ret = chip->gpio_int_n;
1658 fusb302_log(chip, "cannot get named GPIO Int_N, ret=%d", ret);
1661 ret = devm_gpio_request(chip->dev, chip->gpio_int_n, "fcs,int_n");
1663 fusb302_log(chip, "cannot request GPIO Int_N, ret=%d", ret);
1666 ret = gpio_direction_input(chip->gpio_int_n);
1669 "cannot set GPIO Int_N to input, ret=%d", ret);
1672 ret = gpio_to_irq(chip->gpio_int_n);
1675 "cannot request IRQ for GPIO Int_N, ret=%d", ret);
1678 chip->gpio_int_n_irq = ret;
1682 static int fusb302_probe(struct i2c_client *client,
1683 const struct i2c_device_id *id)
1685 struct fusb302_chip *chip;
1686 struct i2c_adapter *adapter;
1689 adapter = to_i2c_adapter(client->dev.parent);
1690 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
1691 dev_err(&client->dev,
1692 "I2C/SMBus block functionality not supported!\n");
1695 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1699 chip->i2c_client = client;
1700 i2c_set_clientdata(client, chip);
1701 chip->dev = &client->dev;
1702 mutex_init(&chip->lock);
1704 ret = fusb302_debugfs_init(chip);
1708 chip->wq = create_singlethread_workqueue(dev_name(chip->dev));
1711 goto clear_client_data;
1713 INIT_DELAYED_WORK(&chip->bc_lvl_handler, fusb302_bc_lvl_handler_work);
1714 init_tcpc_dev(&chip->tcpc_dev);
1716 chip->vbus = devm_regulator_get(chip->dev, "vbus");
1717 if (IS_ERR(chip->vbus)) {
1718 ret = PTR_ERR(chip->vbus);
1719 goto destroy_workqueue;
1722 ret = init_gpio(chip);
1724 goto destroy_workqueue;
1726 chip->tcpm_port = tcpm_register_port(&client->dev, &chip->tcpc_dev);
1727 if (IS_ERR(chip->tcpm_port)) {
1728 ret = PTR_ERR(chip->tcpm_port);
1729 fusb302_log(chip, "cannot register tcpm port, ret=%d", ret);
1730 goto destroy_workqueue;
1733 ret = devm_request_threaded_irq(chip->dev, chip->gpio_int_n_irq,
1734 NULL, fusb302_irq_intn,
1735 IRQF_ONESHOT | IRQF_TRIGGER_LOW,
1736 "fsc_interrupt_int_n", chip);
1739 "cannot request IRQ for GPIO Int_N, ret=%d", ret);
1740 goto tcpm_unregister_port;
1742 enable_irq_wake(chip->gpio_int_n_irq);
1745 tcpm_unregister_port:
1746 tcpm_unregister_port(chip->tcpm_port);
1748 destroy_workqueue(chip->wq);
1750 i2c_set_clientdata(client, NULL);
1751 fusb302_debugfs_exit(chip);
1756 static int fusb302_remove(struct i2c_client *client)
1758 struct fusb302_chip *chip = i2c_get_clientdata(client);
1760 tcpm_unregister_port(chip->tcpm_port);
1761 destroy_workqueue(chip->wq);
1762 i2c_set_clientdata(client, NULL);
1763 fusb302_debugfs_exit(chip);
1768 static int fusb302_pm_suspend(struct device *dev)
1770 struct fusb302_chip *chip = dev->driver_data;
1772 if (atomic_read(&chip->i2c_busy))
1774 atomic_set(&chip->pm_suspend, 1);
1779 static int fusb302_pm_resume(struct device *dev)
1781 struct fusb302_chip *chip = dev->driver_data;
1783 atomic_set(&chip->pm_suspend, 0);
1788 static const struct of_device_id fusb302_dt_match[] = {
1789 {.compatible = "fcs,fusb302"},
1792 MODULE_DEVICE_TABLE(of, fusb302_dt_match);
1794 static const struct i2c_device_id fusb302_i2c_device_id[] = {
1795 {"typec_fusb302", 0},
1798 MODULE_DEVICE_TABLE(i2c, fusb302_i2c_device_id);
1800 static const struct dev_pm_ops fusb302_pm_ops = {
1801 .suspend = fusb302_pm_suspend,
1802 .resume = fusb302_pm_resume,
1805 static struct i2c_driver fusb302_driver = {
1807 .name = "typec_fusb302",
1808 .pm = &fusb302_pm_ops,
1809 .of_match_table = of_match_ptr(fusb302_dt_match),
1811 .probe = fusb302_probe,
1812 .remove = fusb302_remove,
1813 .id_table = fusb302_i2c_device_id,
1815 module_i2c_driver(fusb302_driver);
1817 MODULE_AUTHOR("Yueyao Zhu <yueyao.zhu@gmail.com>");
1818 MODULE_DESCRIPTION("Fairchild FUSB302 Type-C Chip Driver");
1819 MODULE_LICENSE("GPL");