/*
 *  skl.c - Implementation of ASoC Intel SKL HD Audio driver
 *
 *  Copyright (C) 2014-2015 Intel Corp
 *  Author: Jeeja KP <jeeja.kp@intel.com>
 *
 *  Derived mostly from Intel HDA driver with following copyrights:
 *  Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
 *                     PeiSen Hou <pshou@realtek.com.tw>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <sound/pcm.h>
#include "../common/sst-acpi.h"
#include <sound/hda_register.h>
#include <sound/hdaudio.h>
#include <sound/hda_i915.h>
#include "skl.h"
#include "skl-sst-dsp.h"
#include "skl-sst-ipc.h"

static struct skl_machine_pdata skl_dmic_data;

/*
 * initialize the PCI registers
 */
static void skl_update_pci_byte(struct pci_dev *pci, unsigned int reg,
                            unsigned char mask, unsigned char val)
{
        unsigned char data;

        pci_read_config_byte(pci, reg, &data);
        data &= ~mask;
        data |= (val & mask);
        pci_write_config_byte(pci, reg, data);
}

static void skl_init_pci(struct skl *skl)
{
        struct hdac_ext_bus *ebus = &skl->ebus;

        /*
         * Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
         * TCSEL == Traffic Class Select Register, which sets PCI express QOS
         * Ensuring these bits are 0 clears playback static on some HD Audio
         * codecs.
         * The PCI register TCSEL is defined in the Intel manuals.
         */
        dev_dbg(ebus_to_hbus(ebus)->dev, "Clearing TCSEL\n");
        skl_update_pci_byte(skl->pci, AZX_PCIREG_TCSEL, 0x07, 0);
}

static void update_pci_dword(struct pci_dev *pci,
                        unsigned int reg, u32 mask, u32 val)
{
        u32 data = 0;

        pci_read_config_dword(pci, reg, &data);
        data &= ~mask;
        data |= (val & mask);
        pci_write_config_dword(pci, reg, data);
}

/*
 * skl_enable_miscbdcge - enable/dsiable CGCTL.MISCBDCGE bits
 *
 * @dev: device pointer
 * @enable: enable/disable flag
 */
static void skl_enable_miscbdcge(struct device *dev, bool enable)
{
        struct pci_dev *pci = to_pci_dev(dev);
        u32 val;

        val = enable ? AZX_CGCTL_MISCBDCGE_MASK : 0;

        update_pci_dword(pci, AZX_PCIREG_CGCTL, AZX_CGCTL_MISCBDCGE_MASK, val);
}

/*
 * While performing reset, controller may not come back properly causing
 * issues, so recommendation is to set CGCTL.MISCBDCGE to 0 then do reset
 * (init chip) and then again set CGCTL.MISCBDCGE to 1
 */
static int skl_init_chip(struct hdac_bus *bus, bool full_reset)
{
        int ret;

        skl_enable_miscbdcge(bus->dev, false);
        ret = snd_hdac_bus_init_chip(bus, full_reset);
        skl_enable_miscbdcge(bus->dev, true);

        return ret;
}

void skl_update_d0i3c(struct device *dev, bool enable)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        u8 reg;
        int timeout = 50;

        reg = snd_hdac_chip_readb(bus, VS_D0I3C);
        /* Do not write to D0I3C until command in progress bit is cleared */
        while ((reg & AZX_REG_VS_D0I3C_CIP) && --timeout) {
                udelay(10);
                reg = snd_hdac_chip_readb(bus, VS_D0I3C);
        }

        /* Highly unlikely. But if it happens, flag error explicitly */
        if (!timeout) {
                dev_err(bus->dev, "Before D0I3C update: D0I3C CIP timeout\n");
                return;
        }

        if (enable)
                reg = reg | AZX_REG_VS_D0I3C_I3;
        else
                reg = reg & (~AZX_REG_VS_D0I3C_I3);

        snd_hdac_chip_writeb(bus, VS_D0I3C, reg);

        timeout = 50;
        /* Wait for cmd in progress to be cleared before exiting the function */
        reg = snd_hdac_chip_readb(bus, VS_D0I3C);
        while ((reg & AZX_REG_VS_D0I3C_CIP) && --timeout) {
                udelay(10);
                reg = snd_hdac_chip_readb(bus, VS_D0I3C);
        }

        /* Highly unlikely. But if it happens, flag error explicitly */
        if (!timeout) {
                dev_err(bus->dev, "After D0I3C update: D0I3C CIP timeout\n");
                return;
        }

        dev_dbg(bus->dev, "D0I3C register = 0x%x\n",
                        snd_hdac_chip_readb(bus, VS_D0I3C));
}

/* called from IRQ */
static void skl_stream_update(struct hdac_bus *bus, struct hdac_stream *hstr)
{
        snd_pcm_period_elapsed(hstr->substream);
}

static irqreturn_t skl_interrupt(int irq, void *dev_id)
{
        struct hdac_ext_bus *ebus = dev_id;
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        u32 status;

        if (!pm_runtime_active(bus->dev))
                return IRQ_NONE;

        spin_lock(&bus->reg_lock);

        status = snd_hdac_chip_readl(bus, INTSTS);
        if (status == 0 || status == 0xffffffff) {
                spin_unlock(&bus->reg_lock);
                return IRQ_NONE;
        }

        /* clear rirb int */
        status = snd_hdac_chip_readb(bus, RIRBSTS);
        if (status & RIRB_INT_MASK) {
                if (status & RIRB_INT_RESPONSE)
                        snd_hdac_bus_update_rirb(bus);
                snd_hdac_chip_writeb(bus, RIRBSTS, RIRB_INT_MASK);
        }

        spin_unlock(&bus->reg_lock);

        return snd_hdac_chip_readl(bus, INTSTS) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
}

static irqreturn_t skl_threaded_handler(int irq, void *dev_id)
{
        struct hdac_ext_bus *ebus = dev_id;
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        u32 status;

        status = snd_hdac_chip_readl(bus, INTSTS);

        snd_hdac_bus_handle_stream_irq(bus, status, skl_stream_update);

        return IRQ_HANDLED;
}

static int skl_acquire_irq(struct hdac_ext_bus *ebus, int do_disconnect)
{
        struct skl *skl = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        int ret;

        ret = request_threaded_irq(skl->pci->irq, skl_interrupt,
                        skl_threaded_handler,
                        IRQF_SHARED,
                        KBUILD_MODNAME, ebus);
        if (ret) {
                dev_err(bus->dev,
                        "unable to grab IRQ %d, disabling device\n",
                        skl->pci->irq);
                return ret;
        }

        bus->irq = skl->pci->irq;
        pci_intx(skl->pci, 1);

        return 0;
}

static int skl_suspend_late(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct skl *skl = ebus_to_skl(ebus);

        return skl_suspend_late_dsp(skl);
}

#ifdef CONFIG_PM
static int _skl_suspend(struct hdac_ext_bus *ebus)
{
        struct skl *skl = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        struct pci_dev *pci = to_pci_dev(bus->dev);
        int ret;

        snd_hdac_ext_bus_link_power_down_all(ebus);

        ret = skl_suspend_dsp(skl);
        if (ret < 0)
                return ret;

        snd_hdac_bus_stop_chip(bus);
        update_pci_dword(pci, AZX_PCIREG_PGCTL,
                AZX_PGCTL_LSRMD_MASK, AZX_PGCTL_LSRMD_MASK);
        skl_enable_miscbdcge(bus->dev, false);
        snd_hdac_bus_enter_link_reset(bus);
        skl_enable_miscbdcge(bus->dev, true);
        skl_cleanup_resources(skl);

        return 0;
}

static int _skl_resume(struct hdac_ext_bus *ebus)
{
        struct skl *skl = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);

        skl_init_pci(skl);
        skl_init_chip(bus, true);

        return skl_resume_dsp(skl);
}
#endif

#ifdef CONFIG_PM_SLEEP
/*
 * power management
 */
static int skl_suspend(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct skl *skl  = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        int ret = 0;

        /*
         * Do not suspend if streams which are marked ignore suspend are
         * running, we need to save the state for these and continue
         */
        if (skl->supend_active) {
                /* turn off the links and stop the CORB/RIRB DMA if it is On */
                snd_hdac_ext_bus_link_power_down_all(ebus);

                if (ebus->cmd_dma_state)
                        snd_hdac_bus_stop_cmd_io(&ebus->bus);

                enable_irq_wake(bus->irq);
                pci_save_state(pci);
        } else {
                ret = _skl_suspend(ebus);
                if (ret < 0)
                        return ret;
                skl->skl_sst->fw_loaded = false;
        }

        if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) {
                ret = snd_hdac_display_power(bus, false);
                if (ret < 0)
                        dev_err(bus->dev,
                                "Cannot turn OFF display power on i915\n");
        }

        return ret;
}

static int skl_resume(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct skl *skl  = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        struct hdac_ext_link *hlink = NULL;
        int ret;

        /* Turned OFF in HDMI codec driver after codec reconfiguration */
        if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) {
                ret = snd_hdac_display_power(bus, true);
                if (ret < 0) {
                        dev_err(bus->dev,
                                "Cannot turn on display power on i915\n");
                        return ret;
                }
        }

        /*
         * resume only when we are not in suspend active, otherwise need to
         * restore the device
         */
        if (skl->supend_active) {
                pci_restore_state(pci);
                snd_hdac_ext_bus_link_power_up_all(ebus);
                disable_irq_wake(bus->irq);
                /*
                 * turn On the links which are On before active suspend
                 * and start the CORB/RIRB DMA if On before
                 * active suspend.
                 */
                list_for_each_entry(hlink, &ebus->hlink_list, list) {
                        if (hlink->ref_count)
                                snd_hdac_ext_bus_link_power_up(hlink);
                }

                if (ebus->cmd_dma_state)
                        snd_hdac_bus_init_cmd_io(&ebus->bus);
        } else {
                ret = _skl_resume(ebus);

                /* turn off the links which are off before suspend */
                list_for_each_entry(hlink, &ebus->hlink_list, list) {
                        if (!hlink->ref_count)
                                snd_hdac_ext_bus_link_power_down(hlink);
                }

                if (!ebus->cmd_dma_state)
                        snd_hdac_bus_stop_cmd_io(&ebus->bus);
        }

        return ret;
}
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PM
static int skl_runtime_suspend(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct hdac_bus *bus = ebus_to_hbus(ebus);

        dev_dbg(bus->dev, "in %s\n", __func__);

        return _skl_suspend(ebus);
}

static int skl_runtime_resume(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct hdac_bus *bus = ebus_to_hbus(ebus);

        dev_dbg(bus->dev, "in %s\n", __func__);

        return _skl_resume(ebus);
}
#endif /* CONFIG_PM */

static const struct dev_pm_ops skl_pm = {
        SET_SYSTEM_SLEEP_PM_OPS(skl_suspend, skl_resume)
        SET_RUNTIME_PM_OPS(skl_runtime_suspend, skl_runtime_resume, NULL)
        .suspend_late = skl_suspend_late,
};

/*
 * destructor
 */
static int skl_free(struct hdac_ext_bus *ebus)
{
        struct skl *skl  = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);

        skl->init_failed = 1; /* to be sure */

        snd_hdac_ext_stop_streams(ebus);

        if (bus->irq >= 0)
                free_irq(bus->irq, (void *)bus);
        snd_hdac_bus_free_stream_pages(bus);
        snd_hdac_stream_free_all(ebus);
        snd_hdac_link_free_all(ebus);

        if (bus->remap_addr)
                iounmap(bus->remap_addr);

        pci_release_regions(skl->pci);
        pci_disable_device(skl->pci);

        snd_hdac_ext_bus_exit(ebus);

        if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI))
                snd_hdac_i915_exit(&ebus->bus);
        return 0;
}

static int skl_machine_device_register(struct skl *skl, void *driver_data)
{
        struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
        struct platform_device *pdev;
        struct sst_acpi_mach *mach = driver_data;
        int ret;

        mach = sst_acpi_find_machine(mach);
        if (mach == NULL) {
                dev_err(bus->dev, "No matching machine driver found\n");
                return -ENODEV;
        }
        skl->fw_name = mach->fw_filename;

        pdev = platform_device_alloc(mach->drv_name, -1);
        if (pdev == NULL) {
                dev_err(bus->dev, "platform device alloc failed\n");
                return -EIO;
        }

        ret = platform_device_add(pdev);
        if (ret) {
                dev_err(bus->dev, "failed to add machine device\n");
                platform_device_put(pdev);
                return -EIO;
        }

        if (mach->pdata)
                dev_set_drvdata(&pdev->dev, mach->pdata);

        skl->i2s_dev = pdev;

        return 0;
}

static void skl_machine_device_unregister(struct skl *skl)
{
        if (skl->i2s_dev)
                platform_device_unregister(skl->i2s_dev);
}

static int skl_dmic_device_register(struct skl *skl)
{
        struct hdac_bus *bus = ebus_to_hbus(&skl->ebus);
        struct platform_device *pdev;
        int ret;

        /* SKL has one dmic port, so allocate dmic device for this */
        pdev = platform_device_alloc("dmic-codec", -1);
        if (!pdev) {
                dev_err(bus->dev, "failed to allocate dmic device\n");
                return -ENOMEM;
        }

        ret = platform_device_add(pdev);
        if (ret) {
                dev_err(bus->dev, "failed to add dmic device: %d\n", ret);
                platform_device_put(pdev);
                return ret;
        }
        skl->dmic_dev = pdev;

        return 0;
}

static void skl_dmic_device_unregister(struct skl *skl)
{
        if (skl->dmic_dev)
                platform_device_unregister(skl->dmic_dev);
}

/*
 * Probe the given codec address
 */
static int probe_codec(struct hdac_ext_bus *ebus, int addr)
{
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        unsigned int cmd = (addr << 28) | (AC_NODE_ROOT << 20) |
                (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
        unsigned int res;

        mutex_lock(&bus->cmd_mutex);
        snd_hdac_bus_send_cmd(bus, cmd);
        snd_hdac_bus_get_response(bus, addr, &res);
        mutex_unlock(&bus->cmd_mutex);
        if (res == -1)
                return -EIO;
        dev_dbg(bus->dev, "codec #%d probed OK\n", addr);

        return snd_hdac_ext_bus_device_init(ebus, addr);
}

/* Codec initialization */
static int skl_codec_create(struct hdac_ext_bus *ebus)
{
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        int c, max_slots;

        max_slots = HDA_MAX_CODECS;

        /* First try to probe all given codec slots */
        for (c = 0; c < max_slots; c++) {
                if ((bus->codec_mask & (1 << c))) {
                        if (probe_codec(ebus, c) < 0) {
                                /*
                                 * Some BIOSen give you wrong codec addresses
                                 * that don't exist
                                 */
                                dev_warn(bus->dev,
                                         "Codec #%d probe error; disabling it...\n", c);
                                bus->codec_mask &= ~(1 << c);
                                /*
                                 * More badly, accessing to a non-existing
                                 * codec often screws up the controller bus,
                                 * and disturbs the further communications.
                                 * Thus if an error occurs during probing,
                                 * better to reset the controller bus to get
                                 * back to the sanity state.
                                 */
                                snd_hdac_bus_stop_chip(bus);
                                skl_init_chip(bus, true);
                        }
                }
        }

        return 0;
}

static const struct hdac_bus_ops bus_core_ops = {
        .command = snd_hdac_bus_send_cmd,
        .get_response = snd_hdac_bus_get_response,
};

/*
 * constructor
 */
static int skl_create(struct pci_dev *pci,
                      const struct hdac_io_ops *io_ops,
                      struct skl **rskl)
{
        struct skl *skl;
        struct hdac_ext_bus *ebus;

        int err;

        *rskl = NULL;

        err = pci_enable_device(pci);
        if (err < 0)
                return err;

        skl = devm_kzalloc(&pci->dev, sizeof(*skl), GFP_KERNEL);
        if (!skl) {
                pci_disable_device(pci);
                return -ENOMEM;
        }
        ebus = &skl->ebus;
        snd_hdac_ext_bus_init(ebus, &pci->dev, &bus_core_ops, io_ops);
        ebus->bus.use_posbuf = 1;
        skl->pci = pci;

        ebus->bus.bdl_pos_adj = 0;

        *rskl = skl;

        return 0;
}

static int skl_i915_init(struct hdac_bus *bus)
{
        int err;

        /*
         * The HDMI codec is in GPU so we need to ensure that it is powered
         * up and ready for probe
         */
        err = snd_hdac_i915_init(bus);
        if (err < 0)
                return err;

        err = snd_hdac_display_power(bus, true);
        if (err < 0) {
                dev_err(bus->dev, "Cannot turn on display power on i915\n");
                return err;
        }

        return err;
}

static int skl_first_init(struct hdac_ext_bus *ebus)
{
        struct skl *skl = ebus_to_skl(ebus);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        struct pci_dev *pci = skl->pci;
        int err;
        unsigned short gcap;
        int cp_streams, pb_streams, start_idx;

        err = pci_request_regions(pci, "Skylake HD audio");
        if (err < 0)
                return err;

        bus->addr = pci_resource_start(pci, 0);
        bus->remap_addr = pci_ioremap_bar(pci, 0);
        if (bus->remap_addr == NULL) {
                dev_err(bus->dev, "ioremap error\n");
                return -ENXIO;
        }

        snd_hdac_bus_parse_capabilities(bus);

        if (skl_acquire_irq(ebus, 0) < 0)
                return -EBUSY;

        pci_set_master(pci);
        synchronize_irq(bus->irq);

        gcap = snd_hdac_chip_readw(bus, GCAP);
        dev_dbg(bus->dev, "chipset global capabilities = 0x%x\n", gcap);

        /* allow 64bit DMA address if supported by H/W */
        if (!dma_set_mask(bus->dev, DMA_BIT_MASK(64))) {
                dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(64));
        } else {
                dma_set_mask(bus->dev, DMA_BIT_MASK(32));
                dma_set_coherent_mask(bus->dev, DMA_BIT_MASK(32));
        }

        /* read number of streams from GCAP register */
        cp_streams = (gcap >> 8) & 0x0f;
        pb_streams = (gcap >> 12) & 0x0f;

        if (!pb_streams && !cp_streams)
                return -EIO;

        ebus->num_streams = cp_streams + pb_streams;

        /* initialize streams */
        snd_hdac_ext_stream_init_all
                (ebus, 0, cp_streams, SNDRV_PCM_STREAM_CAPTURE);
        start_idx = cp_streams;
        snd_hdac_ext_stream_init_all
                (ebus, start_idx, pb_streams, SNDRV_PCM_STREAM_PLAYBACK);

        err = snd_hdac_bus_alloc_stream_pages(bus);
        if (err < 0)
                return err;

        /* initialize chip */
        skl_init_pci(skl);

        if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) {
                err = skl_i915_init(bus);
                if (err < 0)
                        return err;
        }

        skl_init_chip(bus, true);

        /* codec detection */
        if (!bus->codec_mask) {
                dev_info(bus->dev, "no hda codecs found!\n");
        }

        return 0;
}

static int skl_probe(struct pci_dev *pci,
                     const struct pci_device_id *pci_id)
{
        struct skl *skl;
        struct hdac_ext_bus *ebus = NULL;
        struct hdac_bus *bus = NULL;
        struct hdac_ext_link *hlink = NULL;
        int err;

        /* we use ext core ops, so provide NULL for ops here */
        err = skl_create(pci, NULL, &skl);
        if (err < 0)
                return err;

        ebus = &skl->ebus;
        bus = ebus_to_hbus(ebus);

        err = skl_first_init(ebus);
        if (err < 0)
                goto out_free;

        skl->pci_id = pci->device;

        device_disable_async_suspend(bus->dev);

        skl->nhlt = skl_nhlt_init(bus->dev);

        if (skl->nhlt == NULL) {
                err = -ENODEV;
                goto out_display_power_off;
        }

        skl_nhlt_update_topology_bin(skl);

        pci_set_drvdata(skl->pci, ebus);

        skl_dmic_data.dmic_num = skl_get_dmic_geo(skl);

        /* check if dsp is there */
        if (bus->ppcap) {
                err = skl_machine_device_register(skl,
                                  (void *)pci_id->driver_data);
                if (err < 0)
                        goto out_nhlt_free;

                err = skl_init_dsp(skl);
                if (err < 0) {
                        dev_dbg(bus->dev, "error failed to register dsp\n");
                        goto out_mach_free;
                }
                skl->skl_sst->enable_miscbdcge = skl_enable_miscbdcge;

        }
        if (bus->mlcap)
                snd_hdac_ext_bus_get_ml_capabilities(ebus);

        /* create device for soc dmic */
        err = skl_dmic_device_register(skl);
        if (err < 0)
                goto out_dsp_free;

        /* register platform dai and controls */
        err = skl_platform_register(bus->dev);
        if (err < 0)
                goto out_dmic_free;

        /* create codec instances */
        err = skl_codec_create(ebus);
        if (err < 0)
                goto out_unregister;

        if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) {
                err = snd_hdac_display_power(bus, false);
                if (err < 0) {
                        dev_err(bus->dev, "Cannot turn off display power on i915\n");
                        return err;
                }
        }

        /*
         * we are done probling so decrement link counts
         */
        list_for_each_entry(hlink, &ebus->hlink_list, list)
                snd_hdac_ext_bus_link_put(ebus, hlink);

        /* configure PM */
        pm_runtime_put_noidle(bus->dev);
        pm_runtime_allow(bus->dev);

        return 0;

out_unregister:
        skl_platform_unregister(bus->dev);
out_dmic_free:
        skl_dmic_device_unregister(skl);
out_dsp_free:
        skl_free_dsp(skl);
out_mach_free:
        skl_machine_device_unregister(skl);
out_nhlt_free:
        skl_nhlt_free(skl->nhlt);
out_display_power_off:
        if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI))
                snd_hdac_display_power(bus, false);
out_free:
        skl->init_failed = 1;
        skl_free(ebus);

        return err;
}

static void skl_shutdown(struct pci_dev *pci)
{
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct hdac_bus *bus = ebus_to_hbus(ebus);
        struct hdac_stream *s;
        struct hdac_ext_stream *stream;
        struct skl *skl;

        if (ebus == NULL)
                return;

        skl = ebus_to_skl(ebus);

        if (skl->init_failed)
                return;

        snd_hdac_ext_stop_streams(ebus);
        list_for_each_entry(s, &bus->stream_list, list) {
                stream = stream_to_hdac_ext_stream(s);
                snd_hdac_ext_stream_decouple(ebus, stream, false);
        }

        snd_hdac_bus_stop_chip(bus);
}

static void skl_remove(struct pci_dev *pci)
{
        struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
        struct skl *skl = ebus_to_skl(ebus);

        release_firmware(skl->tplg);

        pm_runtime_get_noresume(&pci->dev);

        /* codec removal, invoke bus_device_remove */
        snd_hdac_ext_bus_device_remove(ebus);

        skl_platform_unregister(&pci->dev);
        skl_free_dsp(skl);
        skl_machine_device_unregister(skl);
        skl_dmic_device_unregister(skl);
        skl_nhlt_free(skl->nhlt);
        skl_free(ebus);
        dev_set_drvdata(&pci->dev, NULL);
}

static struct sst_acpi_mach sst_skl_devdata[] = {
        { "INT343A", "skl_alc286s_i2s", "intel/dsp_fw_release.bin", NULL, NULL, NULL },
        { "INT343B", "skl_n88l25_s4567", "intel/dsp_fw_release.bin",
                                NULL, NULL, &skl_dmic_data },
        { "MX98357A", "skl_n88l25_m98357a", "intel/dsp_fw_release.bin",
                                NULL, NULL, &skl_dmic_data },
        {}
};

static struct sst_acpi_mach sst_bxtp_devdata[] = {
        { "INT343A", "bxt_alc298s_i2s", "intel/dsp_fw_bxtn.bin", NULL, NULL, NULL },
        { "DLGS7219", "bxt_da7219_max98357a_i2s", "intel/dsp_fw_bxtn.bin", NULL, NULL, NULL },
};

static struct sst_acpi_mach sst_kbl_devdata[] = {
        { "INT343A", "kbl_alc286s_i2s", "intel/dsp_fw_kbl.bin", NULL, NULL, NULL },
        { "INT343B", "kbl_n88l25_s4567", "intel/dsp_fw_kbl.bin", NULL, NULL, &skl_dmic_data },
        { "MX98357A", "kbl_n88l25_m98357a", "intel/dsp_fw_kbl.bin", NULL, NULL, &skl_dmic_data },
        {}
};

/* PCI IDs */
static const struct pci_device_id skl_ids[] = {
        /* Sunrise Point-LP */
        { PCI_DEVICE(0x8086, 0x9d70),
                .driver_data = (unsigned long)&sst_skl_devdata},
        /* BXT-P */
        { PCI_DEVICE(0x8086, 0x5a98),
                .driver_data = (unsigned long)&sst_bxtp_devdata},
        /* KBL */
        { PCI_DEVICE(0x8086, 0x9D71),
                .driver_data = (unsigned long)&sst_kbl_devdata},
        { 0, }
};
MODULE_DEVICE_TABLE(pci, skl_ids);

/* pci_driver definition */
static struct pci_driver skl_driver = {
        .name = KBUILD_MODNAME,
        .id_table = skl_ids,
        .probe = skl_probe,
        .remove = skl_remove,
        .shutdown = skl_shutdown,
        .driver = {
                .pm = &skl_pm,
        },
};
module_pci_driver(skl_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel Skylake ASoC HDA driver");