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// SPDX-License-Identifier: GPL-2.0+ /* Copyright (C) 2007,2008 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. / #ifndef __LINUX_USB_OTG_FSM_H #define __LINUX_USB_OTG_FSM_H #include <linux/mutex.h> #include <linux/errno.h> #define PROTO_UNDEF (0) #define PROTO_HOST (1) #define PROTO_GADGET (2) #define OTG_STS_SELECTOR 0xF000 / OTG status selector, according to * OTG and EH 2.0 Chapter 6.2.3 * Table:6-4 / #define HOST_REQUEST_FLAG 1 / Host request flag, according to * OTG and EH 2.0 Charpter 6.2.3 * Table:6-5 / #define T_HOST_REQ_POLL (1500) / 1500ms, HNP polling interval / enum otg_fsm_timer { / Standard OTG timers / A_WAIT_VRISE, A_WAIT_VFALL, A_WAIT_BCON, A_AIDL_BDIS, B_ASE0_BRST, A_BIDL_ADIS, B_AIDL_BDIS, / Auxiliary timers / B_SE0_SRP, B_SRP_FAIL, A_WAIT_ENUM, B_DATA_PLS, B_SSEND_SRP, NUM_OTG_FSM_TIMERS, }; /* * 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 * * Auxilary 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 { / Input / int id; int adp_change; int power_up; int a_srp_det; int a_vbus_vld; int b_conn; int a_bus_resume; int a_bus_suspend; int a_conn; int b_se0_srp; int b_ssend_srp; int b_sess_vld; int test_device; int a_bus_drop; int a_bus_req; int b_bus_req; / Auxilary inputs / int a_sess_vld; int b_bus_resume; int b_bus_suspend; / Output / int drv_vbus; int loc_conn; int loc_sof; int adp_prb; int adp_sns; int data_pulse; / Internal variables / int a_set_b_hnp_en; int b_srp_done; int b_hnp_enable; int a_clr_err; / Informative variables. All unused as of now / int a_bus_drop_inf; int a_bus_req_inf; int a_clr_err_inf; int b_bus_req_inf; / Auxilary informative variables / int a_suspend_req_inf; / Timeout indicator for timers / int a_wait_vrise_tmout; int a_wait_vfall_tmout; int a_wait_bcon_tmout; int a_aidl_bdis_tmout; int b_ase0_brst_tmout; int a_bidl_adis_tmout; struct otg_fsm_ops ops; struct usb_otg otg; / Current usb protocol used: 0:undefine; 1:host; 2:client / int protocol; struct mutex lock; u8 host_req_flag; struct delayed_work hnp_polling_work; bool hnp_work_inited; bool state_changed; }; struct otg_fsm_ops { void (chrg_vbus)(struct otg_fsm fsm, int on); void (drv_vbus)(struct otg_fsm fsm, int on); void (loc_conn)(struct otg_fsm fsm, int on); void (loc_sof)(struct otg_fsm fsm, int on); void (start_pulse)(struct otg_fsm fsm); void (start_adp_prb)(struct otg_fsm fsm); void (start_adp_sns)(struct otg_fsm fsm); void (add_timer)(struct otg_fsm fsm, enum otg_fsm_timer timer); void (del_timer)(struct otg_fsm fsm, enum otg_fsm_timer timer); int (start_host)(struct otg_fsm fsm, int on); int (start_gadget)(struct otg_fsm fsm, int on); }; static inline int otg_chrg_vbus(struct otg_fsm fsm, int on) { if (!fsm->ops->chrg_vbus) return -EOPNOTSUPP; fsm->ops->chrg_vbus(fsm, on); return 0; } static inline int otg_drv_vbus(struct otg_fsm fsm, int on) { if (!fsm->ops->drv_vbus) return -EOPNOTSUPP; if (fsm->drv_vbus != on) { fsm->drv_vbus = on; fsm->ops->drv_vbus(fsm, on); } return 0; } static inline int otg_loc_conn(struct otg_fsm fsm, int on) { if (!fsm->ops->loc_conn) return -EOPNOTSUPP; if (fsm->loc_conn != on) { fsm->loc_conn = on; fsm->ops->loc_conn(fsm, on); } return 0; } static inline int otg_loc_sof(struct otg_fsm fsm, int on) { if (!fsm->ops->loc_sof) return -EOPNOTSUPP; if (fsm->loc_sof != on) { fsm->loc_sof = on; fsm->ops->loc_sof(fsm, on); } return 0; } static inline int otg_start_pulse(struct otg_fsm fsm) { if (!fsm->ops->start_pulse) return -EOPNOTSUPP; if (!fsm->data_pulse) { fsm->data_pulse = 1; fsm->ops->start_pulse(fsm); } return 0; } static inline int otg_start_adp_prb(struct otg_fsm fsm) { if (!fsm->ops->start_adp_prb) return -EOPNOTSUPP; if (!fsm->adp_prb) { fsm->adp_sns = 0; fsm->adp_prb = 1; fsm->ops->start_adp_prb(fsm); } return 0; } static inline int otg_start_adp_sns(struct otg_fsm fsm) { if (!fsm->ops->start_adp_sns) return -EOPNOTSUPP; if (!fsm->adp_sns) { fsm->adp_sns = 1; fsm->ops->start_adp_sns(fsm); } return 0; } static inline int otg_add_timer(struct otg_fsm fsm, enum otg_fsm_timer timer) { if (!fsm->ops->add_timer) return -EOPNOTSUPP; fsm->ops->add_timer(fsm, timer); return 0; } static inline int otg_del_timer(struct otg_fsm fsm, enum otg_fsm_timer timer) { if (!fsm->ops->del_timer) return -EOPNOTSUPP; fsm->ops->del_timer(fsm, timer); return 0; } static inline int otg_start_host(struct otg_fsm fsm, int on) { if (!fsm->ops->start_host) return -EOPNOTSUPP; return fsm->ops->start_host(fsm, on); } static inline int otg_start_gadget(struct otg_fsm fsm, int on) { if (!fsm->ops->start_gadget) return -EOPNOTSUPP; return fsm->ops->start_gadget(fsm, on); } int otg_statemachine(struct otg_fsm fsm); #endif /* __LINUX_USB_OTG_FSM_H */

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