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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Shared Transport driver4 * HCI-LL module responsible for TI proprietary HCI_LL protocol5 * Copyright (C) 2009-2010 Texas Instruments6 * Author: Pavan Savoy <pavan_savoy@ti.com>7 */8 9#define pr_fmt(fmt) "(stll) :" fmt10#include <linux/skbuff.h>11#include <linux/module.h>12#include <linux/platform_device.h>13#include <linux/ti_wilink_st.h>14 15/**********************************************************************/16/* internal functions */17static void send_ll_cmd(struct st_data_s *st_data,18 unsigned char cmd)19{20 21 pr_debug("%s: writing %x", __func__, cmd);22 st_int_write(st_data, &cmd, 1);23 return;24}25 26static void ll_device_want_to_sleep(struct st_data_s *st_data)27{28 struct kim_data_s *kim_data;29 struct ti_st_plat_data *pdata;30 31 pr_debug("%s", __func__);32 /* sanity check */33 if (st_data->ll_state != ST_LL_AWAKE)34 pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"35 "in state %ld", st_data->ll_state);36 37 send_ll_cmd(st_data, LL_SLEEP_ACK);38 /* update state */39 st_data->ll_state = ST_LL_ASLEEP;40 41 /* communicate to platform about chip asleep */42 kim_data = st_data->kim_data;43 pdata = kim_data->kim_pdev->dev.platform_data;44 if (pdata->chip_asleep)45 pdata->chip_asleep(NULL);46}47 48static void ll_device_want_to_wakeup(struct st_data_s *st_data)49{50 struct kim_data_s *kim_data;51 struct ti_st_plat_data *pdata;52 53 /* diff actions in diff states */54 switch (st_data->ll_state) {55 case ST_LL_ASLEEP:56 send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */57 break;58 case ST_LL_ASLEEP_TO_AWAKE:59 /* duplicate wake_ind */60 pr_err("duplicate wake_ind while waiting for Wake ack");61 break;62 case ST_LL_AWAKE:63 /* duplicate wake_ind */64 pr_err("duplicate wake_ind already AWAKE");65 break;66 case ST_LL_AWAKE_TO_ASLEEP:67 /* duplicate wake_ind */68 pr_err("duplicate wake_ind");69 break;70 }71 /* update state */72 st_data->ll_state = ST_LL_AWAKE;73 74 /* communicate to platform about chip wakeup */75 kim_data = st_data->kim_data;76 pdata = kim_data->kim_pdev->dev.platform_data;77 if (pdata->chip_awake)78 pdata->chip_awake(NULL);79}80 81/**********************************************************************/82/* functions invoked by ST Core */83 84/* called when ST Core wants to85 * enable ST LL */86void st_ll_enable(struct st_data_s *ll)87{88 ll->ll_state = ST_LL_AWAKE;89}90 91/* called when ST Core /local module wants to92 * disable ST LL */93void st_ll_disable(struct st_data_s *ll)94{95 ll->ll_state = ST_LL_INVALID;96}97 98/* called when ST Core wants to update the state */99void st_ll_wakeup(struct st_data_s *ll)100{101 if (likely(ll->ll_state != ST_LL_AWAKE)) {102 send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */103 ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;104 } else {105 /* don't send the duplicate wake_indication */106 pr_err(" Chip already AWAKE ");107 }108}109 110/* called when ST Core wants the state */111unsigned long st_ll_getstate(struct st_data_s *ll)112{113 pr_debug(" returning state %ld", ll->ll_state);114 return ll->ll_state;115}116 117/* called from ST Core, when a PM related packet arrives */118unsigned long st_ll_sleep_state(struct st_data_s *st_data,119 unsigned char cmd)120{121 switch (cmd) {122 case LL_SLEEP_IND: /* sleep ind */123 pr_debug("sleep indication recvd");124 ll_device_want_to_sleep(st_data);125 break;126 case LL_SLEEP_ACK: /* sleep ack */127 pr_err("sleep ack rcvd: host shouldn't");128 break;129 case LL_WAKE_UP_IND: /* wake ind */130 pr_debug("wake indication recvd");131 ll_device_want_to_wakeup(st_data);132 break;133 case LL_WAKE_UP_ACK: /* wake ack */134 pr_debug("wake ack rcvd");135 st_data->ll_state = ST_LL_AWAKE;136 break;137 default:138 pr_err(" unknown input/state ");139 return -EINVAL;140 }141 return 0;142}143 144/* Called from ST CORE to initialize ST LL */145long st_ll_init(struct st_data_s *ll)146{147 /* set state to invalid */148 ll->ll_state = ST_LL_INVALID;149 return 0;150}151 152/* Called from ST CORE to de-initialize ST LL */153long st_ll_deinit(struct st_data_s *ll)154{155 return 0;156}157