325 lines
8.6 KiB
C
325 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* Copyright (C) 2007,2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __LINUX_USB_OTG_FSM_H
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#define __LINUX_USB_OTG_FSM_H
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#include <linux/mutex.h>
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#include <linux/errno.h>
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#define PROTO_UNDEF (0)
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#define PROTO_HOST (1)
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#define PROTO_GADGET (2)
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#define OTG_STS_SELECTOR 0xF000 /* OTG status selector, according to
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* OTG and EH 2.0 Chapter 6.2.3
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* Table:6-4
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*/
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#define HOST_REQUEST_FLAG 1 /* Host request flag, according to
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* OTG and EH 2.0 Charpter 6.2.3
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* Table:6-5
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*/
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#define T_HOST_REQ_POLL (1500) /* 1500ms, HNP polling interval */
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enum otg_fsm_timer {
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/* Standard OTG timers */
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A_WAIT_VRISE,
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A_WAIT_VFALL,
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A_WAIT_BCON,
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A_AIDL_BDIS,
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B_ASE0_BRST,
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A_BIDL_ADIS,
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B_AIDL_BDIS,
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/* Auxiliary timers */
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B_SE0_SRP,
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B_SRP_FAIL,
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A_WAIT_ENUM,
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B_DATA_PLS,
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B_SSEND_SRP,
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NUM_OTG_FSM_TIMERS,
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};
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/**
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* struct otg_fsm - OTG state machine according to the OTG spec
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*
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* OTG hardware Inputs
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*
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* Common inputs for A and B device
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* @id: TRUE for B-device, FALSE for A-device.
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* @adp_change: TRUE when current ADP measurement (n) value, compared to the
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* ADP measurement taken at n-2, differs by more than CADP_THR
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* @power_up: TRUE when the OTG device first powers up its USB system and
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* ADP measurement taken if ADP capable
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*
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* A-Device state inputs
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* @a_srp_det: TRUE if the A-device detects SRP
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* @a_vbus_vld: TRUE when VBUS voltage is in regulation
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* @b_conn: TRUE if the A-device detects connection from the B-device
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* @a_bus_resume: TRUE when the B-device detects that the A-device is signaling
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* a resume (K state)
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* B-Device state inputs
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* @a_bus_suspend: TRUE when the B-device detects that the A-device has put the
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* bus into suspend
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* @a_conn: TRUE if the B-device detects a connection from the A-device
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* @b_se0_srp: TRUE when the line has been at SE0 for more than the minimum
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* time before generating SRP
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* @b_ssend_srp: TRUE when the VBUS has been below VOTG_SESS_VLD for more than
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* the minimum time before generating SRP
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* @b_sess_vld: TRUE when the B-device detects that the voltage on VBUS is
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* above VOTG_SESS_VLD
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* @test_device: TRUE when the B-device switches to B-Host and detects an OTG
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* test device. This must be set by host/hub driver
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*
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* Application inputs (A-Device)
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* @a_bus_drop: TRUE when A-device application needs to power down the bus
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* @a_bus_req: TRUE when A-device application wants to use the bus.
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* FALSE to suspend the bus
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*
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* Application inputs (B-Device)
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* @b_bus_req: TRUE during the time that the Application running on the
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* B-device wants to use the bus
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*
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* Auxilary inputs (OTG v1.3 only. Obsolete now.)
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* @a_sess_vld: TRUE if the A-device detects that VBUS is above VA_SESS_VLD
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* @b_bus_suspend: TRUE when the A-device detects that the B-device has put
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* the bus into suspend
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* @b_bus_resume: TRUE when the A-device detects that the B-device is signaling
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* resume on the bus
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*
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* OTG Output status. Read only for users. Updated by OTG FSM helpers defined
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* in this file
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*
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* Outputs for Both A and B device
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* @drv_vbus: TRUE when A-device is driving VBUS
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* @loc_conn: TRUE when the local device has signaled that it is connected
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* to the bus
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* @loc_sof: TRUE when the local device is generating activity on the bus
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* @adp_prb: TRUE when the local device is in the process of doing
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* ADP probing
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*
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* Outputs for B-device state
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* @adp_sns: TRUE when the B-device is in the process of carrying out
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* ADP sensing
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* @data_pulse: TRUE when the B-device is performing data line pulsing
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*
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* Internal Variables
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*
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* a_set_b_hnp_en: TRUE when the A-device has successfully set the
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* b_hnp_enable bit in the B-device.
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* Unused as OTG fsm uses otg->host->b_hnp_enable instead
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* b_srp_done: TRUE when the B-device has completed initiating SRP
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* b_hnp_enable: TRUE when the B-device has accepted the
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* SetFeature(b_hnp_enable) B-device.
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* Unused as OTG fsm uses otg->gadget->b_hnp_enable instead
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* a_clr_err: Asserted (by application ?) to clear a_vbus_err due to an
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* overcurrent condition and causes the A-device to transition
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* to a_wait_vfall
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*/
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struct otg_fsm {
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/* Input */
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int id;
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int adp_change;
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int power_up;
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int a_srp_det;
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int a_vbus_vld;
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int b_conn;
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int a_bus_resume;
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int a_bus_suspend;
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int a_conn;
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int b_se0_srp;
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int b_ssend_srp;
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int b_sess_vld;
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int test_device;
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int a_bus_drop;
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int a_bus_req;
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int b_bus_req;
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/* Auxilary inputs */
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int a_sess_vld;
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int b_bus_resume;
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int b_bus_suspend;
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/* Output */
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int drv_vbus;
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int loc_conn;
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int loc_sof;
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int adp_prb;
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int adp_sns;
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int data_pulse;
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/* Internal variables */
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int a_set_b_hnp_en;
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int b_srp_done;
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int b_hnp_enable;
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int a_clr_err;
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/* Informative variables. All unused as of now */
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int a_bus_drop_inf;
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int a_bus_req_inf;
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int a_clr_err_inf;
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int b_bus_req_inf;
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/* Auxilary informative variables */
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int a_suspend_req_inf;
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/* Timeout indicator for timers */
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int a_wait_vrise_tmout;
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int a_wait_vfall_tmout;
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int a_wait_bcon_tmout;
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int a_aidl_bdis_tmout;
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int b_ase0_brst_tmout;
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int a_bidl_adis_tmout;
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struct otg_fsm_ops *ops;
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struct usb_otg *otg;
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/* Current usb protocol used: 0:undefine; 1:host; 2:client */
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int protocol;
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struct mutex lock;
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u8 *host_req_flag;
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struct delayed_work hnp_polling_work;
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bool state_changed;
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};
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struct otg_fsm_ops {
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void (*chrg_vbus)(struct otg_fsm *fsm, int on);
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void (*drv_vbus)(struct otg_fsm *fsm, int on);
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void (*loc_conn)(struct otg_fsm *fsm, int on);
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void (*loc_sof)(struct otg_fsm *fsm, int on);
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void (*start_pulse)(struct otg_fsm *fsm);
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void (*start_adp_prb)(struct otg_fsm *fsm);
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void (*start_adp_sns)(struct otg_fsm *fsm);
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void (*add_timer)(struct otg_fsm *fsm, enum otg_fsm_timer timer);
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void (*del_timer)(struct otg_fsm *fsm, enum otg_fsm_timer timer);
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int (*start_host)(struct otg_fsm *fsm, int on);
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int (*start_gadget)(struct otg_fsm *fsm, int on);
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};
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static inline int otg_chrg_vbus(struct otg_fsm *fsm, int on)
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{
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if (!fsm->ops->chrg_vbus)
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return -EOPNOTSUPP;
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fsm->ops->chrg_vbus(fsm, on);
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return 0;
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}
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static inline int otg_drv_vbus(struct otg_fsm *fsm, int on)
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{
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if (!fsm->ops->drv_vbus)
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return -EOPNOTSUPP;
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if (fsm->drv_vbus != on) {
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fsm->drv_vbus = on;
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fsm->ops->drv_vbus(fsm, on);
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}
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return 0;
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}
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static inline int otg_loc_conn(struct otg_fsm *fsm, int on)
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{
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if (!fsm->ops->loc_conn)
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return -EOPNOTSUPP;
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if (fsm->loc_conn != on) {
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fsm->loc_conn = on;
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fsm->ops->loc_conn(fsm, on);
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}
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return 0;
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}
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static inline int otg_loc_sof(struct otg_fsm *fsm, int on)
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{
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if (!fsm->ops->loc_sof)
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return -EOPNOTSUPP;
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if (fsm->loc_sof != on) {
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fsm->loc_sof = on;
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fsm->ops->loc_sof(fsm, on);
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}
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return 0;
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}
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static inline int otg_start_pulse(struct otg_fsm *fsm)
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{
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if (!fsm->ops->start_pulse)
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return -EOPNOTSUPP;
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if (!fsm->data_pulse) {
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fsm->data_pulse = 1;
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fsm->ops->start_pulse(fsm);
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}
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return 0;
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}
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static inline int otg_start_adp_prb(struct otg_fsm *fsm)
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{
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if (!fsm->ops->start_adp_prb)
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return -EOPNOTSUPP;
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if (!fsm->adp_prb) {
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fsm->adp_sns = 0;
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fsm->adp_prb = 1;
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fsm->ops->start_adp_prb(fsm);
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}
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return 0;
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}
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static inline int otg_start_adp_sns(struct otg_fsm *fsm)
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{
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if (!fsm->ops->start_adp_sns)
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return -EOPNOTSUPP;
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if (!fsm->adp_sns) {
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fsm->adp_sns = 1;
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fsm->ops->start_adp_sns(fsm);
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}
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return 0;
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}
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static inline int otg_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer timer)
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{
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if (!fsm->ops->add_timer)
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return -EOPNOTSUPP;
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fsm->ops->add_timer(fsm, timer);
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return 0;
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}
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static inline int otg_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer timer)
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{
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if (!fsm->ops->del_timer)
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return -EOPNOTSUPP;
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fsm->ops->del_timer(fsm, timer);
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return 0;
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}
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static inline int otg_start_host(struct otg_fsm *fsm, int on)
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{
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if (!fsm->ops->start_host)
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return -EOPNOTSUPP;
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return fsm->ops->start_host(fsm, on);
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}
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static inline int otg_start_gadget(struct otg_fsm *fsm, int on)
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{
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if (!fsm->ops->start_gadget)
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return -EOPNOTSUPP;
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return fsm->ops->start_gadget(fsm, on);
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}
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int otg_statemachine(struct otg_fsm *fsm);
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#endif /* __LINUX_USB_OTG_FSM_H */
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