mirror of https://gitee.com/openkylin/linux.git
157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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) 2009-2010 Texas Instruments
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* Author: Pavan Savoy <pavan_savoy@ti.com>
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*/
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#define pr_fmt(fmt) "(stll) :" fmt
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/ti_wilink_st.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_debug("%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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struct kim_data_s *kim_data;
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struct ti_st_plat_data *pdata;
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pr_debug("%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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/* communicate to platform about chip asleep */
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kim_data = st_data->kim_data;
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pdata = kim_data->kim_pdev->dev.platform_data;
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if (pdata->chip_asleep)
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pdata->chip_asleep(NULL);
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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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struct kim_data_s *kim_data;
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struct ti_st_plat_data *pdata;
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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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/* communicate to platform about chip wakeup */
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kim_data = st_data->kim_data;
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pdata = kim_data->kim_pdev->dev.platform_data;
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if (pdata->chip_awake)
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pdata->chip_awake(NULL);
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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_debug(" 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_debug("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_debug("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_debug("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 -EINVAL;
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}
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return 0;
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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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