From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/misc/ti-st/st_ll.c | 156 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 156 insertions(+) create mode 100644 drivers/misc/ti-st/st_ll.c (limited to 'drivers/misc/ti-st/st_ll.c') diff --git a/drivers/misc/ti-st/st_ll.c b/drivers/misc/ti-st/st_ll.c new file mode 100644 index 000000000..07406140d --- /dev/null +++ b/drivers/misc/ti-st/st_ll.c @@ -0,0 +1,156 @@ +// 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 + */ + +#define pr_fmt(fmt) "(stll) :" fmt +#include +#include +#include +#include + +/**********************************************************************/ +/* 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; +} -- cgit v1.2.3