2 * otg_fsm.c - ChipIdea USB IP core OTG FSM driver
4 * Copyright (C) 2014 Freescale Semiconductor, Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 * This file mainly handles OTG fsm, it includes OTG fsm operations
22 #include <linux/usb/otg.h>
23 #include <linux/usb/gadget.h>
24 #include <linux/usb/hcd.h>
25 #include <linux/usb/chipidea.h>
26 #include <linux/regulator/consumer.h>
33 static struct ci_otg_fsm_timer *otg_timer_initializer
34 (struct ci_hdrc *ci, void (*function)(void *, unsigned long),
35 unsigned long expires, unsigned long data)
37 struct ci_otg_fsm_timer *timer;
39 timer = devm_kzalloc(ci->dev, sizeof(struct ci_otg_fsm_timer),
43 timer->function = function;
44 timer->expires = expires;
49 /* Add for otg: interact with user space app */
51 get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
55 struct ci_hdrc *ci = dev_get_drvdata(dev);
59 t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req);
63 return PAGE_SIZE - size;
67 set_a_bus_req(struct device *dev, struct device_attribute *attr,
68 const char *buf, size_t count)
70 struct ci_hdrc *ci = dev_get_drvdata(dev);
75 mutex_lock(&ci->fsm.lock);
77 ci->fsm.a_bus_req = 0;
78 } else if (buf[0] == '1') {
79 /* If a_bus_drop is TRUE, a_bus_req can't be set */
80 if (ci->fsm.a_bus_drop) {
81 mutex_unlock(&ci->fsm.lock);
84 ci->fsm.a_bus_req = 1;
87 ci_otg_queue_work(ci);
88 mutex_unlock(&ci->fsm.lock);
92 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req, set_a_bus_req);
95 get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
99 struct ci_hdrc *ci = dev_get_drvdata(dev);
103 t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop);
107 return PAGE_SIZE - size;
111 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
112 const char *buf, size_t count)
114 struct ci_hdrc *ci = dev_get_drvdata(dev);
119 mutex_lock(&ci->fsm.lock);
121 ci->fsm.a_bus_drop = 0;
122 } else if (buf[0] == '1') {
123 ci->fsm.a_bus_drop = 1;
124 ci->fsm.a_bus_req = 0;
127 ci_otg_queue_work(ci);
128 mutex_unlock(&ci->fsm.lock);
132 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR, get_a_bus_drop,
136 get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
140 struct ci_hdrc *ci = dev_get_drvdata(dev);
144 t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req);
148 return PAGE_SIZE - size;
152 set_b_bus_req(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
155 struct ci_hdrc *ci = dev_get_drvdata(dev);
160 mutex_lock(&ci->fsm.lock);
162 ci->fsm.b_bus_req = 0;
163 else if (buf[0] == '1')
164 ci->fsm.b_bus_req = 1;
166 ci_otg_queue_work(ci);
167 mutex_unlock(&ci->fsm.lock);
171 static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUSR, get_b_bus_req, set_b_bus_req);
174 set_a_clr_err(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t count)
177 struct ci_hdrc *ci = dev_get_drvdata(dev);
182 mutex_lock(&ci->fsm.lock);
184 ci->fsm.a_clr_err = 1;
186 ci_otg_queue_work(ci);
187 mutex_unlock(&ci->fsm.lock);
191 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
193 static struct attribute *inputs_attrs[] = {
194 &dev_attr_a_bus_req.attr,
195 &dev_attr_a_bus_drop.attr,
196 &dev_attr_b_bus_req.attr,
197 &dev_attr_a_clr_err.attr,
201 static struct attribute_group inputs_attr_group = {
203 .attrs = inputs_attrs,
207 * Add timer to active timer list
209 static void ci_otg_add_timer(struct ci_hdrc *ci, enum ci_otg_fsm_timer_index t)
211 struct ci_otg_fsm_timer *tmp_timer;
212 struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
213 struct list_head *active_timers = &ci->fsm_timer->active_timers;
215 if (t >= NUM_CI_OTG_FSM_TIMERS)
219 * Check if the timer is already in the active list,
220 * if so update timer count
222 list_for_each_entry(tmp_timer, active_timers, list)
223 if (tmp_timer == timer) {
224 timer->count = timer->expires;
228 timer->count = timer->expires;
229 list_add_tail(&timer->list, active_timers);
232 if (!(hw_read_otgsc(ci, OTGSC_1MSIE)))
233 hw_write_otgsc(ci, OTGSC_1MSIE, OTGSC_1MSIE);
237 * Remove timer from active timer list
239 static void ci_otg_del_timer(struct ci_hdrc *ci, enum ci_otg_fsm_timer_index t)
241 struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
242 struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
243 struct list_head *active_timers = &ci->fsm_timer->active_timers;
245 if (t >= NUM_CI_OTG_FSM_TIMERS)
248 list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list)
249 if (tmp_timer == timer)
250 list_del(&timer->list);
252 /* Disable 1ms irq if there is no any active timer */
253 if (list_empty(active_timers))
254 hw_write_otgsc(ci, OTGSC_1MSIE, 0);
258 * Reduce timer count by 1, and find timeout conditions.
259 * Called by otg 1ms timer interrupt
261 static inline int ci_otg_tick_timer(struct ci_hdrc *ci)
263 struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
264 struct list_head *active_timers = &ci->fsm_timer->active_timers;
267 list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list) {
269 /* check if timer expires */
270 if (!tmp_timer->count) {
271 list_del(&tmp_timer->list);
272 tmp_timer->function(ci, tmp_timer->data);
277 /* disable 1ms irq if there is no any timer active */
278 if ((expired == 1) && list_empty(active_timers))
279 hw_write_otgsc(ci, OTGSC_1MSIE, 0);
284 /* The timeout callback function to set time out bit */
285 static void set_tmout(void *ptr, unsigned long indicator)
287 *(int *)indicator = 1;
290 static void set_tmout_and_fsm(void *ptr, unsigned long indicator)
292 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
294 set_tmout(ci, indicator);
296 ci_otg_queue_work(ci);
299 static void a_wait_vfall_tmout_func(void *ptr, unsigned long indicator)
301 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
303 set_tmout(ci, indicator);
304 /* Disable port power */
305 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP, 0);
306 /* Clear exsiting DP irq */
307 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
308 /* Enable data pulse irq */
309 hw_write_otgsc(ci, OTGSC_DPIE, OTGSC_DPIE);
310 ci_otg_queue_work(ci);
313 static void b_ase0_brst_tmout_func(void *ptr, unsigned long indicator)
315 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
317 set_tmout(ci, indicator);
318 if (!hw_read_otgsc(ci, OTGSC_BSV))
319 ci->fsm.b_sess_vld = 0;
321 ci_otg_queue_work(ci);
324 static void b_ssend_srp_tmout_func(void *ptr, unsigned long indicator)
326 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
328 set_tmout(ci, indicator);
330 /* only vbus fall below B_sess_vld in b_idle state */
331 if (ci->transceiver->state == OTG_STATE_B_IDLE)
332 ci_otg_queue_work(ci);
335 static void b_sess_vld_tmout_func(void *ptr, unsigned long indicator)
337 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
339 /* Check if A detached */
340 if (!(hw_read_otgsc(ci, OTGSC_BSV))) {
341 ci->fsm.b_sess_vld = 0;
342 ci_otg_add_timer(ci, B_SSEND_SRP);
343 ci_otg_queue_work(ci);
347 static void b_data_pulse_end(void *ptr, unsigned long indicator)
349 struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
351 ci->fsm.b_srp_done = 1;
352 ci->fsm.b_bus_req = 0;
353 if (ci->fsm.power_up)
354 ci->fsm.power_up = 0;
356 hw_write_otgsc(ci, OTGSC_HABA, 0);
358 ci_otg_queue_work(ci);
361 /* Initialize timers */
362 static int ci_otg_init_timers(struct ci_hdrc *ci)
364 struct otg_fsm *fsm = &ci->fsm;
366 /* FSM used timers */
367 ci->fsm_timer->timer_list[A_WAIT_VRISE] =
368 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_WAIT_VRISE,
369 (unsigned long)&fsm->a_wait_vrise_tmout);
370 if (ci->fsm_timer->timer_list[A_WAIT_VRISE] == NULL)
373 ci->fsm_timer->timer_list[A_WAIT_VFALL] =
374 otg_timer_initializer(ci, &a_wait_vfall_tmout_func,
375 TA_WAIT_VFALL, (unsigned long)&fsm->a_wait_vfall_tmout);
376 if (ci->fsm_timer->timer_list[A_WAIT_VFALL] == NULL)
379 ci->fsm_timer->timer_list[A_WAIT_BCON] =
380 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_WAIT_BCON,
381 (unsigned long)&fsm->a_wait_bcon_tmout);
382 if (ci->fsm_timer->timer_list[A_WAIT_BCON] == NULL)
385 ci->fsm_timer->timer_list[A_AIDL_BDIS] =
386 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_AIDL_BDIS,
387 (unsigned long)&fsm->a_aidl_bdis_tmout);
388 if (ci->fsm_timer->timer_list[A_AIDL_BDIS] == NULL)
391 ci->fsm_timer->timer_list[A_BIDL_ADIS] =
392 otg_timer_initializer(ci, &set_tmout_and_fsm, TA_BIDL_ADIS,
393 (unsigned long)&fsm->a_bidl_adis_tmout);
394 if (ci->fsm_timer->timer_list[A_BIDL_ADIS] == NULL)
397 ci->fsm_timer->timer_list[B_ASE0_BRST] =
398 otg_timer_initializer(ci, &b_ase0_brst_tmout_func, TB_ASE0_BRST,
399 (unsigned long)&fsm->b_ase0_brst_tmout);
400 if (ci->fsm_timer->timer_list[B_ASE0_BRST] == NULL)
403 ci->fsm_timer->timer_list[B_SE0_SRP] =
404 otg_timer_initializer(ci, &set_tmout_and_fsm, TB_SE0_SRP,
405 (unsigned long)&fsm->b_se0_srp);
406 if (ci->fsm_timer->timer_list[B_SE0_SRP] == NULL)
409 ci->fsm_timer->timer_list[B_SSEND_SRP] =
410 otg_timer_initializer(ci, &b_ssend_srp_tmout_func, TB_SSEND_SRP,
411 (unsigned long)&fsm->b_ssend_srp);
412 if (ci->fsm_timer->timer_list[B_SSEND_SRP] == NULL)
415 ci->fsm_timer->timer_list[B_SRP_FAIL] =
416 otg_timer_initializer(ci, &set_tmout, TB_SRP_FAIL,
417 (unsigned long)&fsm->b_srp_done);
418 if (ci->fsm_timer->timer_list[B_SRP_FAIL] == NULL)
421 ci->fsm_timer->timer_list[B_DATA_PLS] =
422 otg_timer_initializer(ci, &b_data_pulse_end, TB_DATA_PLS, 0);
423 if (ci->fsm_timer->timer_list[B_DATA_PLS] == NULL)
426 ci->fsm_timer->timer_list[B_SESS_VLD] = otg_timer_initializer(ci,
427 &b_sess_vld_tmout_func, TB_SESS_VLD, 0);
428 if (ci->fsm_timer->timer_list[B_SESS_VLD] == NULL)
434 /* -------------------------------------------------------------*/
435 /* Operations that will be called from OTG Finite State Machine */
436 /* -------------------------------------------------------------*/
437 static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
439 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
441 if (t < NUM_OTG_FSM_TIMERS)
442 ci_otg_add_timer(ci, t);
446 static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
448 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
450 if (t < NUM_OTG_FSM_TIMERS)
451 ci_otg_del_timer(ci, t);
456 * A-device drive vbus: turn on vbus regulator and enable port power
457 * Data pulse irq should be disabled while vbus is on.
459 static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
462 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
465 /* Enable power power */
466 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
468 if (ci->platdata->reg_vbus) {
469 ret = regulator_enable(ci->platdata->reg_vbus);
472 "Failed to enable vbus regulator, ret=%d\n",
477 /* Disable data pulse irq */
478 hw_write_otgsc(ci, OTGSC_DPIE, 0);
483 if (ci->platdata->reg_vbus)
484 regulator_disable(ci->platdata->reg_vbus);
492 * Control data line by Run Stop bit.
494 static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
496 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
499 hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
501 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
505 * Generate SOF by host.
506 * This is controlled through suspend/resume the port.
507 * In host mode, controller will automatically send SOF.
508 * Suspend will block the data on the port.
510 static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
512 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
515 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_FPR,
518 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_SUSP,
523 * Start SRP pulsing by data-line pulsing,
524 * no v-bus pulsing followed
526 static void ci_otg_start_pulse(struct otg_fsm *fsm)
528 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
530 /* Hardware Assistant Data pulse */
531 hw_write_otgsc(ci, OTGSC_HADP, OTGSC_HADP);
533 ci_otg_add_timer(ci, B_DATA_PLS);
536 static int ci_otg_start_host(struct otg_fsm *fsm, int on)
538 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
540 mutex_unlock(&fsm->lock);
543 ci_role_start(ci, CI_ROLE_HOST);
546 hw_device_reset(ci, USBMODE_CM_DC);
547 ci_role_start(ci, CI_ROLE_GADGET);
549 mutex_lock(&fsm->lock);
553 static int ci_otg_start_gadget(struct otg_fsm *fsm, int on)
555 struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
557 mutex_unlock(&fsm->lock);
559 usb_gadget_vbus_connect(&ci->gadget);
561 usb_gadget_vbus_disconnect(&ci->gadget);
562 mutex_lock(&fsm->lock);
567 static struct otg_fsm_ops ci_otg_ops = {
568 .drv_vbus = ci_otg_drv_vbus,
569 .loc_conn = ci_otg_loc_conn,
570 .loc_sof = ci_otg_loc_sof,
571 .start_pulse = ci_otg_start_pulse,
572 .add_timer = ci_otg_fsm_add_timer,
573 .del_timer = ci_otg_fsm_del_timer,
574 .start_host = ci_otg_start_host,
575 .start_gadget = ci_otg_start_gadget,
578 int ci_otg_fsm_work(struct ci_hdrc *ci)
581 * Don't do fsm transition for B device
582 * when there is no gadget class driver
584 if (ci->fsm.id && !(ci->driver) &&
585 ci->transceiver->state < OTG_STATE_A_IDLE)
588 if (otg_statemachine(&ci->fsm)) {
589 if (ci->transceiver->state == OTG_STATE_A_IDLE) {
591 * Further state change for cases:
592 * a_idle to b_idle; or
593 * a_idle to a_wait_vrise due to ID change(1->0), so
594 * B-dev becomes A-dev can try to start new session
596 * a_idle to a_wait_vrise when power up
598 if ((ci->fsm.id) || (ci->id_event) ||
600 ci_otg_queue_work(ci);
602 ci->id_event = false;
603 } else if (ci->transceiver->state == OTG_STATE_B_IDLE) {
604 if (ci->fsm.b_sess_vld) {
605 ci->fsm.power_up = 0;
607 * Further transite to b_periphearl state
608 * when register gadget driver with vbus on
610 ci_otg_queue_work(ci);
618 * Update fsm variables in each state if catching expected interrupts,
619 * called by otg fsm isr.
621 static void ci_otg_fsm_event(struct ci_hdrc *ci)
623 u32 intr_sts, otg_bsess_vld, port_conn;
624 struct otg_fsm *fsm = &ci->fsm;
626 intr_sts = hw_read_intr_status(ci);
627 otg_bsess_vld = hw_read_otgsc(ci, OTGSC_BSV);
628 port_conn = hw_read(ci, OP_PORTSC, PORTSC_CCS);
630 switch (ci->transceiver->state) {
631 case OTG_STATE_A_WAIT_BCON:
635 ci_otg_queue_work(ci);
638 case OTG_STATE_B_IDLE:
639 if (otg_bsess_vld && (intr_sts & USBi_PCI) && port_conn) {
641 ci_otg_queue_work(ci);
644 case OTG_STATE_B_PERIPHERAL:
645 if ((intr_sts & USBi_SLI) && port_conn && otg_bsess_vld) {
646 fsm->a_bus_suspend = 1;
647 ci_otg_queue_work(ci);
648 } else if (intr_sts & USBi_PCI) {
649 if (fsm->a_bus_suspend == 1)
650 fsm->a_bus_suspend = 0;
653 case OTG_STATE_B_HOST:
654 if ((intr_sts & USBi_PCI) && !port_conn) {
657 ci_otg_queue_work(ci);
658 ci_otg_add_timer(ci, B_SESS_VLD);
661 case OTG_STATE_A_PERIPHERAL:
662 if (intr_sts & USBi_SLI) {
663 fsm->b_bus_suspend = 1;
665 * Init a timer to know how long this suspend
666 * will contine, if time out, indicates B no longer
667 * wants to be host role
669 ci_otg_add_timer(ci, A_BIDL_ADIS);
672 if (intr_sts & USBi_URI)
673 ci_otg_del_timer(ci, A_BIDL_ADIS);
675 if (intr_sts & USBi_PCI) {
676 if (fsm->b_bus_suspend == 1) {
677 ci_otg_del_timer(ci, A_BIDL_ADIS);
678 fsm->b_bus_suspend = 0;
682 case OTG_STATE_A_SUSPEND:
683 if ((intr_sts & USBi_PCI) && !port_conn) {
686 /* if gadget driver is binded */
688 /* A device to be peripheral mode */
689 ci->gadget.is_a_peripheral = 1;
691 ci_otg_queue_work(ci);
694 case OTG_STATE_A_HOST:
695 if ((intr_sts & USBi_PCI) && !port_conn) {
697 ci_otg_queue_work(ci);
700 case OTG_STATE_B_WAIT_ACON:
701 if ((intr_sts & USBi_PCI) && port_conn) {
703 ci_otg_queue_work(ci);
712 * ci_otg_irq - otg fsm related irq handling
713 * and also update otg fsm variable by monitoring usb host and udc
714 * state change interrupts.
717 irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci)
719 irqreturn_t retval = IRQ_NONE;
720 u32 otgsc, otg_int_src = 0;
721 struct otg_fsm *fsm = &ci->fsm;
723 otgsc = hw_read_otgsc(ci, ~0);
724 otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8);
725 fsm->id = (otgsc & OTGSC_ID) ? 1 : 0;
728 if (otg_int_src & OTGSC_1MSIS) {
729 hw_write_otgsc(ci, OTGSC_1MSIS, OTGSC_1MSIS);
730 retval = ci_otg_tick_timer(ci);
732 } else if (otg_int_src & OTGSC_DPIS) {
733 hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
736 } else if (otg_int_src & OTGSC_IDIS) {
737 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
743 } else if (otg_int_src & OTGSC_BSVIS) {
744 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
745 if (otgsc & OTGSC_BSV) {
747 ci_otg_del_timer(ci, B_SSEND_SRP);
748 ci_otg_del_timer(ci, B_SRP_FAIL);
749 fsm->b_ssend_srp = 0;
753 ci_otg_add_timer(ci, B_SSEND_SRP);
755 } else if (otg_int_src & OTGSC_AVVIS) {
756 hw_write_otgsc(ci, OTGSC_AVVIS, OTGSC_AVVIS);
757 if (otgsc & OTGSC_AVV) {
764 ci_otg_queue_work(ci);
768 ci_otg_fsm_event(ci);
773 void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
775 ci_otg_queue_work(ci);
778 int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
783 otg = devm_kzalloc(ci->dev,
784 sizeof(struct usb_otg), GFP_KERNEL);
787 "Failed to allocate usb_otg structure for ci hdrc otg!\n");
791 otg->phy = ci->transceiver;
792 otg->gadget = &ci->gadget;
794 ci->transceiver->otg = ci->fsm.otg;
795 ci->fsm.power_up = 1;
796 ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
797 ci->transceiver->state = OTG_STATE_UNDEFINED;
798 ci->fsm.ops = &ci_otg_ops;
800 mutex_init(&ci->fsm.lock);
802 ci->fsm_timer = devm_kzalloc(ci->dev,
803 sizeof(struct ci_otg_fsm_timer_list), GFP_KERNEL);
804 if (!ci->fsm_timer) {
806 "Failed to allocate timer structure for ci hdrc otg!\n");
810 INIT_LIST_HEAD(&ci->fsm_timer->active_timers);
811 retval = ci_otg_init_timers(ci);
813 dev_err(ci->dev, "Couldn't init OTG timers\n");
817 retval = sysfs_create_group(&ci->dev->kobj, &inputs_attr_group);
820 "Can't register sysfs attr group: %d\n", retval);
824 /* Enable A vbus valid irq */
825 hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE);
828 ci->fsm.b_ssend_srp =
829 hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1;
831 hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0;
833 hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE);
839 void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci)
841 sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group);