st_ll.c

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/*
 *  Shared Transport driver
 *  HCI-LL module responsible for TI proprietary HCI_LL protocol
 *  Copyright (C) 2009-2010 Texas Instruments
 *  Author: Pavan Savoy <[email protected]>
 *
 *  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 <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;
}