Commit 1d065ab6 authored by Pavan Savoy's avatar Pavan Savoy Committed by Greg Kroah-Hartman

Staging: sources for HCI LL PM protocol

Texas Instruments BT, FM and GPS combo chips/drivers
make use of a single TTY to communicate with the chip.
This module constitutes the proprietary power management
protocol from TI for the BT/FM/GPS combo chips
Signed-off-by: default avatarPavan Savoy <pavan_savoy@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d0088ce1
/*
* Shared Transport driver
* HCI-LL module responsible for TI proprietary HCI_LL protocol
* Copyright (C) 2009 Texas Instruments
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#define pr_fmt(fmt) "(stll) :" fmt
#include "st_ll.h"
/**********************************************************************/
/* internal functions */
static void send_ll_cmd(struct st_data_s *st_data,
unsigned char cmd)
{
pr_info("%s: writing %x", __func__, cmd);
st_int_write(st_data, &cmd, 1);
return;
}
static void ll_device_want_to_sleep(struct st_data_s *st_data)
{
pr_info("%s", __func__);
/* sanity check */
if (st_data->ll_state != ST_LL_AWAKE)
pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"
"in state %ld", st_data->ll_state);
send_ll_cmd(st_data, LL_SLEEP_ACK);
/* update state */
st_data->ll_state = ST_LL_ASLEEP;
}
static void ll_device_want_to_wakeup(struct st_data_s *st_data)
{
/* diff actions in diff states */
switch (st_data->ll_state) {
case ST_LL_ASLEEP:
send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */
break;
case ST_LL_ASLEEP_TO_AWAKE:
/* duplicate wake_ind */
pr_err("duplicate wake_ind while waiting for Wake ack");
break;
case ST_LL_AWAKE:
/* duplicate wake_ind */
pr_err("duplicate wake_ind already AWAKE");
break;
case ST_LL_AWAKE_TO_ASLEEP:
/* duplicate wake_ind */
pr_err("duplicate wake_ind");
break;
}
/* update state */
st_data->ll_state = ST_LL_AWAKE;
}
/**********************************************************************/
/* functions invoked by ST Core */
/* called when ST Core wants to
* enable ST LL */
void st_ll_enable(struct st_data_s *ll)
{
ll->ll_state = ST_LL_AWAKE;
}
/* called when ST Core /local module wants to
* disable ST LL */
void st_ll_disable(struct st_data_s *ll)
{
ll->ll_state = ST_LL_INVALID;
}
/* called when ST Core wants to update the state */
void st_ll_wakeup(struct st_data_s *ll)
{
if (likely(ll->ll_state != ST_LL_AWAKE)) {
send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */
ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;
} else {
/* don't send the duplicate wake_indication */
pr_err(" Chip already AWAKE ");
}
}
/* called when ST Core wants the state */
unsigned long st_ll_getstate(struct st_data_s *ll)
{
pr_info(" returning state %ld", ll->ll_state);
return ll->ll_state;
}
/* called from ST Core, when a PM related packet arrives */
unsigned long st_ll_sleep_state(struct st_data_s *st_data,
unsigned char cmd)
{
switch (cmd) {
case LL_SLEEP_IND: /* sleep ind */
pr_info("sleep indication recvd");
ll_device_want_to_sleep(st_data);
break;
case LL_SLEEP_ACK: /* sleep ack */
pr_err("sleep ack rcvd: host shouldn't");
break;
case LL_WAKE_UP_IND: /* wake ind */
pr_info("wake indication recvd");
ll_device_want_to_wakeup(st_data);
break;
case LL_WAKE_UP_ACK: /* wake ack */
pr_info("wake ack rcvd");
st_data->ll_state = ST_LL_AWAKE;
break;
default:
pr_err(" unknown input/state ");
return ST_ERR_FAILURE;
}
return ST_SUCCESS;
}
/* Called from ST CORE to initialize ST LL */
long st_ll_init(struct st_data_s *ll)
{
/* set state to invalid */
ll->ll_state = ST_LL_INVALID;
return 0;
}
/* Called from ST CORE to de-initialize ST LL */
long st_ll_deinit(struct st_data_s *ll)
{
return 0;
}
/*
* Shared Transport Low Level (ST LL)
*
* Copyright (C) 2009 Texas Instruments
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef ST_LL_H
#define ST_LL_H
#include <linux/skbuff.h>
#include "st.h"
#include "st_core.h"
/* ST LL receiver states */
#define ST_W4_PACKET_TYPE 0
#define ST_BT_W4_EVENT_HDR 1
#define ST_BT_W4_ACL_HDR 2
#define ST_BT_W4_SCO_HDR 3
#define ST_BT_W4_DATA 4
#define ST_FM_W4_EVENT_HDR 5
#define ST_GPS_W4_EVENT_HDR 6
/* ST LL state machines */
#define ST_LL_ASLEEP 0
#define ST_LL_ASLEEP_TO_AWAKE 1
#define ST_LL_AWAKE 2
#define ST_LL_AWAKE_TO_ASLEEP 3
#define ST_LL_INVALID 4
#define LL_SLEEP_IND 0x30
#define LL_SLEEP_ACK 0x31
#define LL_WAKE_UP_IND 0x32
#define LL_WAKE_UP_ACK 0x33
/* initialize and de-init ST LL */
long st_ll_init(struct st_data_s *);
long st_ll_deinit(struct st_data_s *);
/* enable/disable ST LL along with KIM start/stop
* called by ST Core
*/
void st_ll_enable(struct st_data_s *);
void st_ll_disable(struct st_data_s *);
unsigned long st_ll_getstate(struct st_data_s *);
unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
void st_ll_wakeup(struct st_data_s *);
#endif /* ST_LL_H */
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