linux/drivers/misc/ti-st/st_ll.c
Thomas Gleixner 4505153954 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 136 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:06 +02:00

157 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Shared Transport driver
* HCI-LL module responsible for TI proprietary HCI_LL protocol
* Copyright (C) 2009-2010 Texas Instruments
* Author: Pavan Savoy <pavan_savoy@ti.com>
*/
#define pr_fmt(fmt) "(stll) :" fmt
#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/ti_wilink_st.h>
/**********************************************************************/
/* internal functions */
static void send_ll_cmd(struct st_data_s *st_data,
unsigned char cmd)
{
pr_debug("%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)
{
struct kim_data_s *kim_data;
struct ti_st_plat_data *pdata;
pr_debug("%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;
/* communicate to platform about chip asleep */
kim_data = st_data->kim_data;
pdata = kim_data->kim_pdev->dev.platform_data;
if (pdata->chip_asleep)
pdata->chip_asleep(NULL);
}
static void ll_device_want_to_wakeup(struct st_data_s *st_data)
{
struct kim_data_s *kim_data;
struct ti_st_plat_data *pdata;
/* 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;
/* communicate to platform about chip wakeup */
kim_data = st_data->kim_data;
pdata = kim_data->kim_pdev->dev.platform_data;
if (pdata->chip_awake)
pdata->chip_awake(NULL);
}
/**********************************************************************/
/* 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_debug(" 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_debug("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_debug("wake indication recvd");
ll_device_want_to_wakeup(st_data);
break;
case LL_WAKE_UP_ACK: /* wake ack */
pr_debug("wake ack rcvd");
st_data->ll_state = ST_LL_AWAKE;
break;
default:
pr_err(" unknown input/state ");
return -EINVAL;
}
return 0;
}
/* 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;
}