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/* 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>
#undef VERBOSE
#ifdef VERBOSE
#define VDBG(fmt, args...) pr_debug("[%s] " fmt , \
__func__, ## args)
#else
#define VDBG(stuff...) do {} while (0)
#endif
#ifdef VERBOSE
#define MPC_LOC printk("Current Location [%s]:[%d]\n", __FILE__, __LINE__)
#else
#define MPC_LOC do {} while (0)
#endif
#define PROTO_UNDEF (0)
#define PROTO_HOST (1)
#define PROTO_GADGET (2)
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,
/* Auxiliary timers */
B_SE0_SRP,
B_SRP_FAIL,
A_WAIT_ENUM,
NUM_OTG_FSM_TIMERS,
};
/* OTG state machine according to the OTG spec */
struct otg_fsm {
/* Input */
int id;
int adp_change;
int power_up;
int test_device;
int a_bus_drop;
int a_bus_req;
int a_srp_det;
int a_vbus_vld;
int b_conn;
int a_bus_resume;
int a_bus_suspend;
int a_conn;
int b_bus_req;
int b_se0_srp;
int b_ssend_srp;
int b_sess_vld;
/* Auxilary inputs */
int a_sess_vld;
int b_bus_resume;
int b_bus_suspend;
/* Output */
int data_pulse;
int drv_vbus;
int loc_conn;
int loc_sof;
int adp_prb;
int adp_sns;
/* Internal variables */
int a_set_b_hnp_en;
int b_srp_done;
int b_hnp_enable;
int a_clr_err;
/* Informative variables */
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;
};
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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