linux/drivers/usb/chipidea/otg.c

// SPDX-License-Identifier: GPL-2.0
/*
 * otg.c - ChipIdea USB IP core OTG driver
 *
 * Copyright (C) 2013 Freescale Semiconductor, Inc.
 *
 * Author: Peter Chen
 */

/*
 * This file mainly handles otgsc register, OTG fsm operations for HNP and SRP
 * are also included.
 */

#include <linux/usb/otg.h>
#include <linux/usb/gadget.h>
#include <linux/usb/chipidea.h>

#include "ci.h"
#include "bits.h"
#include "otg.h"
#include "otg_fsm.h"

/**
 * hw_read_otgsc - returns otgsc register bits value.
 * @ci: the controller
 * @mask: bitfield mask
 */
u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
{ … }

/**
 * hw_write_otgsc - updates target bits of OTGSC register.
 * @ci: the controller
 * @mask: bitfield mask
 * @data: to be written
 */
void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
{ … }

/**
 * ci_otg_role - pick role based on ID pin state
 * @ci: the controller
 */
enum ci_role ci_otg_role(struct ci_hdrc *ci)
{ … }

void ci_handle_vbus_change(struct ci_hdrc *ci)
{ … }

/**
 * hw_wait_vbus_lower_bsv - When we switch to device mode, the vbus value
 *                          should be lower than OTGSC_BSV before connecting
 *                          to host.
 *
 * @ci: the controller
 *
 * This function returns an error code if timeout
 */
static int hw_wait_vbus_lower_bsv(struct ci_hdrc *ci)
{ … }

void ci_handle_id_switch(struct ci_hdrc *ci)
{ … }
/**
 * ci_otg_work - perform otg (vbus/id) event handle
 * @work: work struct
 */
static void ci_otg_work(struct work_struct *work)
{ … }


/**
 * ci_hdrc_otg_init - initialize otg struct
 * @ci: the controller
 */
int ci_hdrc_otg_init(struct ci_hdrc *ci)
{ … }

/**
 * ci_hdrc_otg_destroy - destroy otg struct
 * @ci: the controller
 */
void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
{ … }