// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2007,2008 Freescale Semiconductor, Inc. */ #ifndef __LINUX_USB_OTG_FSM_H #define __LINUX_USB_OTG_FSM_H #include <linux/mutex.h> #include <linux/errno.h> #define PROTO_UNDEF … #define PROTO_HOST … #define PROTO_GADGET … #define OTG_STS_SELECTOR … #define HOST_REQUEST_FLAG … #define T_HOST_REQ_POLL … enum otg_fsm_timer { … }; /** * struct otg_fsm - OTG state machine according to the OTG spec * * OTG hardware Inputs * * Common inputs for A and B device * @id: TRUE for B-device, FALSE for A-device. * @adp_change: TRUE when current ADP measurement (n) value, compared to the * ADP measurement taken at n-2, differs by more than CADP_THR * @power_up: TRUE when the OTG device first powers up its USB system and * ADP measurement taken if ADP capable * * A-Device state inputs * @a_srp_det: TRUE if the A-device detects SRP * @a_vbus_vld: TRUE when VBUS voltage is in regulation * @b_conn: TRUE if the A-device detects connection from the B-device * @a_bus_resume: TRUE when the B-device detects that the A-device is signaling * a resume (K state) * B-Device state inputs * @a_bus_suspend: TRUE when the B-device detects that the A-device has put the * bus into suspend * @a_conn: TRUE if the B-device detects a connection from the A-device * @b_se0_srp: TRUE when the line has been at SE0 for more than the minimum * time before generating SRP * @b_ssend_srp: TRUE when the VBUS has been below VOTG_SESS_VLD for more than * the minimum time before generating SRP * @b_sess_vld: TRUE when the B-device detects that the voltage on VBUS is * above VOTG_SESS_VLD * @test_device: TRUE when the B-device switches to B-Host and detects an OTG * test device. This must be set by host/hub driver * * Application inputs (A-Device) * @a_bus_drop: TRUE when A-device application needs to power down the bus * @a_bus_req: TRUE when A-device application wants to use the bus. * FALSE to suspend the bus * * Application inputs (B-Device) * @b_bus_req: TRUE during the time that the Application running on the * B-device wants to use the bus * * Auxiliary inputs (OTG v1.3 only. Obsolete now.) * @a_sess_vld: TRUE if the A-device detects that VBUS is above VA_SESS_VLD * @b_bus_suspend: TRUE when the A-device detects that the B-device has put * the bus into suspend * @b_bus_resume: TRUE when the A-device detects that the B-device is signaling * resume on the bus * * OTG Output status. Read only for users. Updated by OTG FSM helpers defined * in this file * * Outputs for Both A and B device * @drv_vbus: TRUE when A-device is driving VBUS * @loc_conn: TRUE when the local device has signaled that it is connected * to the bus * @loc_sof: TRUE when the local device is generating activity on the bus * @adp_prb: TRUE when the local device is in the process of doing * ADP probing * * Outputs for B-device state * @adp_sns: TRUE when the B-device is in the process of carrying out * ADP sensing * @data_pulse: TRUE when the B-device is performing data line pulsing * * Internal Variables * * a_set_b_hnp_en: TRUE when the A-device has successfully set the * b_hnp_enable bit in the B-device. * Unused as OTG fsm uses otg->host->b_hnp_enable instead * b_srp_done: TRUE when the B-device has completed initiating SRP * b_hnp_enable: TRUE when the B-device has accepted the * SetFeature(b_hnp_enable) B-device. * Unused as OTG fsm uses otg->gadget->b_hnp_enable instead * a_clr_err: Asserted (by application ?) to clear a_vbus_err due to an * overcurrent condition and causes the A-device to transition * to a_wait_vfall */ struct otg_fsm { … }; struct otg_fsm_ops { … }; static inline int otg_chrg_vbus(struct otg_fsm *fsm, int on) { … } static inline int otg_drv_vbus(struct otg_fsm *fsm, int on) { … } static inline int otg_loc_conn(struct otg_fsm *fsm, int on) { … } static inline int otg_loc_sof(struct otg_fsm *fsm, int on) { … } static inline int otg_start_pulse(struct otg_fsm *fsm) { … } static inline int otg_start_adp_prb(struct otg_fsm *fsm) { … } static inline int otg_start_adp_sns(struct otg_fsm *fsm) { … } static inline int otg_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer timer) { … } static inline int otg_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer timer) { … } static inline int otg_start_host(struct otg_fsm *fsm, int on) { … } static inline int otg_start_gadget(struct otg_fsm *fsm, int on) { … } int otg_statemachine(struct otg_fsm *fsm); #endif /* __LINUX_USB_OTG_FSM_H */
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