src/connectivity/wlan/drivers/third_party/intel/iwlwifi/mvm/led.c

/******************************************************************************
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2017        Intel Deutschland GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *****************************************************************************/

#include <linux/leds.h>
#include "iwl-csr.h"
#include "iwl-io.h"
#include "mvm.h"

static void iwl_mvm_send_led_fw_cmd(struct iwl_mvm* mvm, bool on) {
    struct iwl_led_cmd led_cmd = {
        .status = cpu_to_le32(on),
    };
    struct iwl_host_cmd cmd = {
        .id = WIDE_ID(LONG_GROUP, LEDS_CMD),
        .len =
            {
                sizeof(led_cmd),
            },
        .data =
            {
                &led_cmd,
            },
        .flags = CMD_ASYNC,
    };
    int err;

    if (!iwl_mvm_firmware_running(mvm)) { return; }

    err = iwl_mvm_send_cmd(mvm, &cmd);

    if (err) { IWL_WARN(mvm, "LED command failed: %d\n", err); }
}

static void iwl_mvm_led_set(struct iwl_mvm* mvm, bool on) {
    if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_LED_CMD_SUPPORT)) {
        iwl_mvm_send_led_fw_cmd(mvm, on);
        return;
    }

    iwl_write32(mvm->trans, CSR_LED_REG, on ? CSR_LED_REG_TURN_ON : CSR_LED_REG_TURN_OFF);
}

static void iwl_led_brightness_set(struct led_classdev* led_cdev, enum led_brightness brightness) {
    struct iwl_mvm* mvm = container_of(led_cdev, struct iwl_mvm, led);

    iwl_mvm_led_set(mvm, brightness > 0);
}

int iwl_mvm_leds_init(struct iwl_mvm* mvm) {
    int mode = iwlwifi_mod_params.led_mode;
    int ret;

    switch (mode) {
    case IWL_LED_BLINK:
        IWL_ERR(mvm, "Blink led mode not supported, used default\n");
    case IWL_LED_DEFAULT:
    case IWL_LED_RF_STATE:
        mode = IWL_LED_RF_STATE;
        break;
    case IWL_LED_DISABLE:
        IWL_INFO(mvm, "Led disabled\n");
        return 0;
    default:
        return -EINVAL;
    }

    mvm->led.name = kasprintf(GFP_KERNEL, "%s-led", wiphy_name(mvm->hw->wiphy));
    mvm->led.brightness_set = iwl_led_brightness_set;
    mvm->led.max_brightness = 1;

    if (mode == IWL_LED_RF_STATE) {
        mvm->led.default_trigger = ieee80211_get_radio_led_name(mvm->hw);
    }

    ret = led_classdev_register(mvm->trans->dev, &mvm->led);
    if (ret) {
        kfree(mvm->led.name);
        IWL_INFO(mvm, "Failed to enable led\n");
        return ret;
    }

    mvm->init_status |= IWL_MVM_INIT_STATUS_LEDS_INIT_COMPLETE;
    return 0;
}

void iwl_mvm_leds_sync(struct iwl_mvm* mvm) {
    if (!(mvm->init_status & IWL_MVM_INIT_STATUS_LEDS_INIT_COMPLETE)) { return; }

    /*
     * if we control through the register, we're doing it
     * even when the firmware isn't up, so no need to sync
     */
    if (mvm->cfg->device_family < IWL_DEVICE_FAMILY_8000) { return; }

    iwl_mvm_led_set(mvm, mvm->led.brightness > 0);
}

void iwl_mvm_leds_exit(struct iwl_mvm* mvm) {
    if (!(mvm->init_status & IWL_MVM_INIT_STATUS_LEDS_INIT_COMPLETE)) { return; }

    led_classdev_unregister(&mvm->led);
    kfree(mvm->led.name);
    mvm->init_status &= ~IWL_MVM_INIT_STATUS_LEDS_INIT_COMPLETE;
}