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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: Pavan Savoy <pavan_savoy@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavan Savoy
Greg Kroah-Hartman
parent
d0088ce183
commit
1d065ab683
147
drivers/staging/ti-st/st_ll.c
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147
drivers/staging/ti-st/st_ll.c
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/*
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* Shared Transport driver
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* HCI-LL module responsible for TI proprietary HCI_LL protocol
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* Copyright (C) 2009 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#define pr_fmt(fmt) "(stll) :" fmt
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#include "st_ll.h"
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/**********************************************************************/
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/* internal functions */
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static void send_ll_cmd(struct st_data_s *st_data,
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unsigned char cmd)
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{
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pr_info("%s: writing %x", __func__, cmd);
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st_int_write(st_data, &cmd, 1);
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return;
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}
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static void ll_device_want_to_sleep(struct st_data_s *st_data)
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{
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pr_info("%s", __func__);
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/* sanity check */
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if (st_data->ll_state != ST_LL_AWAKE)
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pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"
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"in state %ld", st_data->ll_state);
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send_ll_cmd(st_data, LL_SLEEP_ACK);
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/* update state */
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st_data->ll_state = ST_LL_ASLEEP;
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}
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static void ll_device_want_to_wakeup(struct st_data_s *st_data)
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{
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/* diff actions in diff states */
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switch (st_data->ll_state) {
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case ST_LL_ASLEEP:
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send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */
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break;
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case ST_LL_ASLEEP_TO_AWAKE:
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/* duplicate wake_ind */
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pr_err("duplicate wake_ind while waiting for Wake ack");
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break;
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case ST_LL_AWAKE:
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/* duplicate wake_ind */
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pr_err("duplicate wake_ind already AWAKE");
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break;
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case ST_LL_AWAKE_TO_ASLEEP:
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/* duplicate wake_ind */
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pr_err("duplicate wake_ind");
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break;
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}
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/* update state */
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st_data->ll_state = ST_LL_AWAKE;
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}
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/**********************************************************************/
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/* functions invoked by ST Core */
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/* called when ST Core wants to
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* enable ST LL */
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void st_ll_enable(struct st_data_s *ll)
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{
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ll->ll_state = ST_LL_AWAKE;
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}
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/* called when ST Core /local module wants to
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* disable ST LL */
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void st_ll_disable(struct st_data_s *ll)
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{
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ll->ll_state = ST_LL_INVALID;
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}
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/* called when ST Core wants to update the state */
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void st_ll_wakeup(struct st_data_s *ll)
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{
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if (likely(ll->ll_state != ST_LL_AWAKE)) {
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send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */
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ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;
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} else {
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/* don't send the duplicate wake_indication */
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pr_err(" Chip already AWAKE ");
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}
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}
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/* called when ST Core wants the state */
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unsigned long st_ll_getstate(struct st_data_s *ll)
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{
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pr_info(" returning state %ld", ll->ll_state);
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return ll->ll_state;
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}
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/* called from ST Core, when a PM related packet arrives */
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unsigned long st_ll_sleep_state(struct st_data_s *st_data,
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unsigned char cmd)
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{
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switch (cmd) {
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case LL_SLEEP_IND: /* sleep ind */
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pr_info("sleep indication recvd");
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ll_device_want_to_sleep(st_data);
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break;
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case LL_SLEEP_ACK: /* sleep ack */
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pr_err("sleep ack rcvd: host shouldn't");
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break;
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case LL_WAKE_UP_IND: /* wake ind */
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pr_info("wake indication recvd");
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ll_device_want_to_wakeup(st_data);
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break;
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case LL_WAKE_UP_ACK: /* wake ack */
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pr_info("wake ack rcvd");
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st_data->ll_state = ST_LL_AWAKE;
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break;
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default:
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pr_err(" unknown input/state ");
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return ST_ERR_FAILURE;
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}
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return ST_SUCCESS;
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}
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/* Called from ST CORE to initialize ST LL */
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long st_ll_init(struct st_data_s *ll)
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{
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/* set state to invalid */
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ll->ll_state = ST_LL_INVALID;
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return 0;
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}
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/* Called from ST CORE to de-initialize ST LL */
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long st_ll_deinit(struct st_data_s *ll)
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{
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return 0;
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}
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62
drivers/staging/ti-st/st_ll.h
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62
drivers/staging/ti-st/st_ll.h
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@ -0,0 +1,62 @@
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/*
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* Shared Transport Low Level (ST LL)
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*
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* Copyright (C) 2009 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef ST_LL_H
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#define ST_LL_H
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#include <linux/skbuff.h>
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#include "st.h"
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#include "st_core.h"
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/* ST LL receiver states */
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#define ST_W4_PACKET_TYPE 0
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#define ST_BT_W4_EVENT_HDR 1
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#define ST_BT_W4_ACL_HDR 2
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#define ST_BT_W4_SCO_HDR 3
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#define ST_BT_W4_DATA 4
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#define ST_FM_W4_EVENT_HDR 5
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#define ST_GPS_W4_EVENT_HDR 6
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/* ST LL state machines */
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#define ST_LL_ASLEEP 0
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#define ST_LL_ASLEEP_TO_AWAKE 1
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#define ST_LL_AWAKE 2
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#define ST_LL_AWAKE_TO_ASLEEP 3
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#define ST_LL_INVALID 4
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#define LL_SLEEP_IND 0x30
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#define LL_SLEEP_ACK 0x31
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#define LL_WAKE_UP_IND 0x32
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#define LL_WAKE_UP_ACK 0x33
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/* initialize and de-init ST LL */
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long st_ll_init(struct st_data_s *);
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long st_ll_deinit(struct st_data_s *);
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/* enable/disable ST LL along with KIM start/stop
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* called by ST Core
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*/
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void st_ll_enable(struct st_data_s *);
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void st_ll_disable(struct st_data_s *);
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unsigned long st_ll_getstate(struct st_data_s *);
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unsigned long st_ll_sleep_state(struct st_data_s *, unsigned char);
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void st_ll_wakeup(struct st_data_s *);
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#endif /* ST_LL_H */
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