staging:iio:trigger handle name attr in core, remove old alloc and register any contr...

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / intel_sst / intel_sst.c

/*
 *  intel_sst.c - Intel SST Driver for audio engine
 *
 *  Copyright (C) 2008-10       Intel Corp
 *  Authors:    Vinod Koul <vinod.koul@intel.com>
 *              Harsha Priya <priya.harsha@intel.com>
 *              Dharageswari R <dharageswari.r@intel.com>
 *              KP Jeeja <jeeja.kp@intel.com>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This driver exposes the audio engine functionalities to the ALSA
 *       and middleware.
 *
 *  This file contains all init functions
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/pci.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/firmware.h>
#include <linux/miscdevice.h>
#include <linux/pm_runtime.h>
#include <asm/mrst.h>
#include "intel_sst.h"
#include "intel_sst_ioctl.h"
#include "intel_sst_fw_ipc.h"
#include "intel_sst_common.h"


MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
MODULE_AUTHOR("Dharageswari R <dharageswari.r@intel.com>");
MODULE_AUTHOR("KP Jeeja <jeeja.kp@intel.com>");
MODULE_DESCRIPTION("Intel (R) SST(R) Audio Engine Driver");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(SST_DRIVER_VERSION);

struct intel_sst_drv *sst_drv_ctx;
static struct mutex drv_ctx_lock;
struct class *sst_class;

/* fops Routines */
static const struct file_operations intel_sst_fops = {
        .owner = THIS_MODULE,
        .open = intel_sst_open,
        .release = intel_sst_release,
        .read = intel_sst_read,
        .write = intel_sst_write,
        .unlocked_ioctl = intel_sst_ioctl,
        .mmap = intel_sst_mmap,
        .aio_read = intel_sst_aio_read,
        .aio_write = intel_sst_aio_write,
};
static const struct file_operations intel_sst_fops_cntrl = {
        .owner = THIS_MODULE,
        .open = intel_sst_open_cntrl,
        .release = intel_sst_release_cntrl,
        .unlocked_ioctl = intel_sst_ioctl,
};

static struct miscdevice lpe_dev = {
        .minor = MISC_DYNAMIC_MINOR,/* dynamic allocation */
        .name = "intel_sst",/* /dev/intel_sst */
        .fops = &intel_sst_fops
};


static struct miscdevice lpe_ctrl = {
        .minor = MISC_DYNAMIC_MINOR,/* dynamic allocation */
        .name = "intel_sst_ctrl",/* /dev/intel_sst_ctrl */
        .fops = &intel_sst_fops_cntrl
};

/**
* intel_sst_interrupt - Interrupt service routine for SST
*
* @irq: irq number of interrupt
* @context: pointer to device structre
*
* This function is called by OS when SST device raises
* an interrupt. This will be result of write in IPC register
* Source can be busy or done interrupt
*/
static irqreturn_t intel_sst_interrupt(int irq, void *context)
{
        union interrupt_reg isr;
        union ipc_header header;
        union interrupt_reg imr;
        struct intel_sst_drv *drv = (struct intel_sst_drv *) context;
        unsigned int size = 0, str_id;
        struct stream_info *stream ;

        /* Do not handle interrupt in suspended state */
        if (drv->sst_state == SST_SUSPENDED)
                return IRQ_NONE;
        /* Interrupt arrived, check src */
        isr.full = sst_shim_read(drv->shim, SST_ISRX);

        if (isr.part.busy_interrupt) {
                header.full = sst_shim_read(drv->shim, SST_IPCD);
                if (header.part.msg_id == IPC_SST_PERIOD_ELAPSED) {
                        sst_clear_interrupt();
                        str_id = header.part.str_id;
                        stream = &sst_drv_ctx->streams[str_id];
                        if (stream->period_elapsed)
                                stream->period_elapsed(stream->pcm_substream);
                        return IRQ_HANDLED;
                }
                if (header.part.large)
                        size = header.part.data;
                if (header.part.msg_id & REPLY_MSG) {
                        sst_drv_ctx->ipc_process_msg.header = header;
                        memcpy_fromio(sst_drv_ctx->ipc_process_msg.mailbox,
                                drv->mailbox + SST_MAILBOX_RCV, size);
                        queue_work(sst_drv_ctx->process_msg_wq,
                                        &sst_drv_ctx->ipc_process_msg.wq);
                } else {
                        sst_drv_ctx->ipc_process_reply.header = header;
                        memcpy_fromio(sst_drv_ctx->ipc_process_reply.mailbox,
                                drv->mailbox + SST_MAILBOX_RCV, size);
                        queue_work(sst_drv_ctx->process_reply_wq,
                                        &sst_drv_ctx->ipc_process_reply.wq);
                }
                /* mask busy inetrrupt */
                imr.full = sst_shim_read(drv->shim, SST_IMRX);
                imr.part.busy_interrupt = 1;
                sst_shim_write(sst_drv_ctx->shim, SST_IMRX, imr.full);
                return IRQ_HANDLED;
        } else if (isr.part.done_interrupt) {
                /* Clear done bit */
                header.full = sst_shim_read(drv->shim, SST_IPCX);
                header.part.done = 0;
                sst_shim_write(sst_drv_ctx->shim, SST_IPCX, header.full);
                /* write 1 to clear status register */;
                isr.part.done_interrupt = 1;
                /* dummy register for shim workaround */
                sst_shim_write(sst_drv_ctx->shim, SST_ISRX, isr.full);
                queue_work(sst_drv_ctx->post_msg_wq,
                        &sst_drv_ctx->ipc_post_msg.wq);
                return IRQ_HANDLED;
        } else
                return IRQ_NONE;

}


/*
* intel_sst_probe - PCI probe function
*
* @pci: PCI device structure
* @pci_id: PCI device ID structure
*
* This function is called by OS when a device is found
* This enables the device, interrupt etc
*/
static int __devinit intel_sst_probe(struct pci_dev *pci,
                        const struct pci_device_id *pci_id)
{
        int i, ret = 0;

        pr_debug("Probe for DID %x\n", pci->device);
        mutex_lock(&drv_ctx_lock);
        if (sst_drv_ctx) {
                pr_err("Only one sst handle is supported\n");
                mutex_unlock(&drv_ctx_lock);
                return -EBUSY;
        }

        sst_drv_ctx = kzalloc(sizeof(*sst_drv_ctx), GFP_KERNEL);
        if (!sst_drv_ctx) {
                pr_err("malloc fail\n");
                mutex_unlock(&drv_ctx_lock);
                return -ENOMEM;
        }
        mutex_unlock(&drv_ctx_lock);

        sst_drv_ctx->pci_id = pci->device;

        mutex_init(&sst_drv_ctx->stream_lock);
        mutex_init(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->pmic_state = SND_MAD_UN_INIT;

        sst_drv_ctx->stream_cnt = 0;
        sst_drv_ctx->encoded_cnt = 0;
        sst_drv_ctx->am_cnt = 0;
        sst_drv_ctx->pb_streams = 0;
        sst_drv_ctx->cp_streams = 0;
        sst_drv_ctx->unique_id = 0;
        sst_drv_ctx->pmic_port_instance = SST_DEFAULT_PMIC_PORT;

        INIT_LIST_HEAD(&sst_drv_ctx->ipc_dispatch_list);
        INIT_WORK(&sst_drv_ctx->ipc_post_msg.wq, sst_post_message);
        INIT_WORK(&sst_drv_ctx->ipc_process_msg.wq, sst_process_message);
        INIT_WORK(&sst_drv_ctx->ipc_process_reply.wq, sst_process_reply);
        INIT_WORK(&sst_drv_ctx->mad_ops.wq, sst_process_mad_ops);
        init_waitqueue_head(&sst_drv_ctx->wait_queue);

        sst_drv_ctx->mad_wq = create_workqueue("sst_mad_wq");
        if (!sst_drv_ctx->mad_wq)
                goto do_free_drv_ctx;
        sst_drv_ctx->post_msg_wq = create_workqueue("sst_post_msg_wq");
        if (!sst_drv_ctx->post_msg_wq)
                goto free_mad_wq;
        sst_drv_ctx->process_msg_wq = create_workqueue("sst_process_msg_wqq");
        if (!sst_drv_ctx->process_msg_wq)
                goto free_post_msg_wq;
        sst_drv_ctx->process_reply_wq = create_workqueue("sst_proces_reply_wq");
        if (!sst_drv_ctx->process_reply_wq)
                goto free_process_msg_wq;

        for (i = 0; i < MAX_ACTIVE_STREAM; i++) {
                sst_drv_ctx->alloc_block[i].sst_id = BLOCK_UNINIT;
                sst_drv_ctx->alloc_block[i].ops_block.condition = false;
        }
        spin_lock_init(&sst_drv_ctx->list_spin_lock);

        sst_drv_ctx->max_streams = pci_id->driver_data;
        pr_debug("Got drv data max stream %d\n",
                                sst_drv_ctx->max_streams);
        for (i = 1; i <= sst_drv_ctx->max_streams; i++) {
                struct stream_info *stream = &sst_drv_ctx->streams[i];
                INIT_LIST_HEAD(&stream->bufs);
                mutex_init(&stream->lock);
                spin_lock_init(&stream->pcm_lock);
        }
        if (sst_drv_ctx->pci_id == SST_MRST_PCI_ID) {
                sst_drv_ctx->mmap_mem = NULL;
                sst_drv_ctx->mmap_len = SST_MMAP_PAGES * PAGE_SIZE;
                while (sst_drv_ctx->mmap_len > 0) {
                        sst_drv_ctx->mmap_mem =
                                kzalloc(sst_drv_ctx->mmap_len, GFP_KERNEL);
                        if (sst_drv_ctx->mmap_mem) {
                                pr_debug("Got memory %p size 0x%x\n",
                                        sst_drv_ctx->mmap_mem,
                                        sst_drv_ctx->mmap_len);
                                break;
                        }
                        if (sst_drv_ctx->mmap_len < (SST_MMAP_STEP*PAGE_SIZE)) {
                                pr_err("mem alloc fail...abort!!\n");
                                ret = -ENOMEM;
                                goto free_process_reply_wq;
                        }
                        sst_drv_ctx->mmap_len -= (SST_MMAP_STEP * PAGE_SIZE);
                        pr_debug("mem alloc failed...trying %d\n",
                                                sst_drv_ctx->mmap_len);
                }
        }

        /* Init the device */
        ret = pci_enable_device(pci);
        if (ret) {
                pr_err("device can't be enabled\n");
                goto do_free_mem;
        }
        sst_drv_ctx->pci = pci_dev_get(pci);
        ret = pci_request_regions(pci, SST_DRV_NAME);
        if (ret)
                goto do_disable_device;
        /* map registers */
        /* SST Shim */
        sst_drv_ctx->shim_phy_add = pci_resource_start(pci, 1);
        sst_drv_ctx->shim = pci_ioremap_bar(pci, 1);
        if (!sst_drv_ctx->shim)
                goto do_release_regions;
        pr_debug("SST Shim Ptr %p\n", sst_drv_ctx->shim);

        /* Shared SRAM */
        sst_drv_ctx->mailbox = pci_ioremap_bar(pci, 2);
        if (!sst_drv_ctx->mailbox)
                goto do_unmap_shim;
        pr_debug("SRAM Ptr %p\n", sst_drv_ctx->mailbox);

        /* IRAM */
        sst_drv_ctx->iram = pci_ioremap_bar(pci, 3);
        if (!sst_drv_ctx->iram)
                goto do_unmap_sram;
        pr_debug("IRAM Ptr %p\n", sst_drv_ctx->iram);

        /* DRAM */
        sst_drv_ctx->dram = pci_ioremap_bar(pci, 4);
        if (!sst_drv_ctx->dram)
                goto do_unmap_iram;
        pr_debug("DRAM Ptr %p\n", sst_drv_ctx->dram);

        mutex_lock(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->sst_state = SST_UN_INIT;
        mutex_unlock(&sst_drv_ctx->sst_lock);
        /* Register the ISR */
        ret = request_irq(pci->irq, intel_sst_interrupt,
                IRQF_SHARED, SST_DRV_NAME, sst_drv_ctx);
        if (ret)
                goto do_unmap_dram;
        pr_debug("Registered IRQ 0x%x\n", pci->irq);

        /*Register LPE Control as misc driver*/
        ret = misc_register(&lpe_ctrl);
        if (ret) {
                pr_err("couldn't register control device\n");
                goto do_free_irq;
        }

        if (sst_drv_ctx->pci_id == SST_MRST_PCI_ID) {
                ret = misc_register(&lpe_dev);
                if (ret) {
                        pr_err("couldn't register LPE device\n");
                        goto do_free_misc;
                }
        } else if (sst_drv_ctx->pci_id == SST_MFLD_PCI_ID) {
                u32 csr;

                /*allocate mem for fw context save during suspend*/
                sst_drv_ctx->fw_cntx = kzalloc(FW_CONTEXT_MEM, GFP_KERNEL);
                if (!sst_drv_ctx->fw_cntx) {
                        ret = -ENOMEM;
                        goto do_free_misc;
                }
                /*setting zero as that is valid mem to restore*/
                sst_drv_ctx->fw_cntx_size = 0;

                /*set lpe start clock and ram size*/
                csr = sst_shim_read(sst_drv_ctx->shim, SST_CSR);
                csr |= 0x30060; /*remove the clock ratio after fw fix*/
                sst_shim_write(sst_drv_ctx->shim, SST_CSR, csr);
        }
        sst_drv_ctx->lpe_stalled = 0;
        pci_set_drvdata(pci, sst_drv_ctx);
        pm_runtime_allow(&pci->dev);
        pm_runtime_put_noidle(&pci->dev);
        pr_debug("...successfully done!!!\n");
        return ret;

do_free_misc:
        misc_deregister(&lpe_ctrl);
do_free_irq:
        free_irq(pci->irq, sst_drv_ctx);
do_unmap_dram:
        iounmap(sst_drv_ctx->dram);
do_unmap_iram:
        iounmap(sst_drv_ctx->iram);
do_unmap_sram:
        iounmap(sst_drv_ctx->mailbox);
do_unmap_shim:
        iounmap(sst_drv_ctx->shim);
do_release_regions:
        pci_release_regions(pci);
do_disable_device:
        pci_disable_device(pci);
do_free_mem:
        kfree(sst_drv_ctx->mmap_mem);
free_process_reply_wq:
        destroy_workqueue(sst_drv_ctx->process_reply_wq);
free_process_msg_wq:
        destroy_workqueue(sst_drv_ctx->process_msg_wq);
free_post_msg_wq:
        destroy_workqueue(sst_drv_ctx->post_msg_wq);
free_mad_wq:
        destroy_workqueue(sst_drv_ctx->mad_wq);
do_free_drv_ctx:
        kfree(sst_drv_ctx);
        sst_drv_ctx = NULL;
        pr_err("Probe failed with %d\n", ret);
        return ret;
}

/**
* intel_sst_remove - PCI remove function
*
* @pci: PCI device structure
*
* This function is called by OS when a device is unloaded
* This frees the interrupt etc
*/
static void __devexit intel_sst_remove(struct pci_dev *pci)
{
        pm_runtime_get_noresume(&pci->dev);
        pm_runtime_forbid(&pci->dev);
        pci_dev_put(sst_drv_ctx->pci);
        mutex_lock(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->sst_state = SST_UN_INIT;
        mutex_unlock(&sst_drv_ctx->sst_lock);
        misc_deregister(&lpe_ctrl);
        free_irq(pci->irq, sst_drv_ctx);
        iounmap(sst_drv_ctx->dram);
        iounmap(sst_drv_ctx->iram);
        iounmap(sst_drv_ctx->mailbox);
        iounmap(sst_drv_ctx->shim);
        sst_drv_ctx->pmic_state = SND_MAD_UN_INIT;
        if (sst_drv_ctx->pci_id == SST_MRST_PCI_ID) {
                misc_deregister(&lpe_dev);
                kfree(sst_drv_ctx->mmap_mem);
        } else
                kfree(sst_drv_ctx->fw_cntx);
        flush_scheduled_work();
        destroy_workqueue(sst_drv_ctx->process_reply_wq);
        destroy_workqueue(sst_drv_ctx->process_msg_wq);
        destroy_workqueue(sst_drv_ctx->post_msg_wq);
        destroy_workqueue(sst_drv_ctx->mad_wq);
        kfree(pci_get_drvdata(pci));
        sst_drv_ctx = NULL;
        pci_release_regions(pci);
        pci_disable_device(pci);
        pci_set_drvdata(pci, NULL);
}

void sst_save_dsp_context(void)
{
        struct snd_sst_ctxt_params fw_context;
        unsigned int pvt_id, i;
        struct ipc_post *msg = NULL;

        /*check cpu type*/
        if (sst_drv_ctx->pci_id != SST_MFLD_PCI_ID)
                return;
                /*not supported for rest*/
        if (sst_drv_ctx->sst_state != SST_FW_RUNNING) {
                pr_debug("fw not running no context save ...\n");
                return;
        }

        /*send msg to fw*/
        if (sst_create_large_msg(&msg))
                return;
        pvt_id = sst_assign_pvt_id(sst_drv_ctx);
        i = sst_get_block_stream(sst_drv_ctx);
        sst_drv_ctx->alloc_block[i].sst_id = pvt_id;
        sst_fill_header(&msg->header, IPC_IA_GET_FW_CTXT, 1, pvt_id);
        msg->header.part.data = sizeof(fw_context) + sizeof(u32);
        fw_context.address = virt_to_phys((void *)sst_drv_ctx->fw_cntx);
        fw_context.size = FW_CONTEXT_MEM;
        memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
        memcpy(msg->mailbox_data + sizeof(u32),
                                &fw_context, sizeof(fw_context));
        spin_lock(&sst_drv_ctx->list_spin_lock);
        list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
        spin_unlock(&sst_drv_ctx->list_spin_lock);
        sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
        /*wait for reply*/
        if (sst_wait_timeout(sst_drv_ctx, &sst_drv_ctx->alloc_block[i]))
                pr_debug("err fw context save timeout  ...\n");
        sst_drv_ctx->alloc_block[i].sst_id = BLOCK_UNINIT;
        pr_debug("fw context saved  ...\n");
        return;
}

/* Power Management */
/*
* intel_sst_suspend - PCI suspend function
*
* @pci: PCI device structure
* @state: PM message
*
* This function is called by OS when a power event occurs
*/
int intel_sst_suspend(struct pci_dev *pci, pm_message_t state)
{
        union config_status_reg csr;

        pr_debug("intel_sst_suspend called\n");

        if (sst_drv_ctx->stream_cnt) {
                pr_err("active streams,not able to suspend\n");
                return -EBUSY;
        }
        /*save fw context*/
        sst_save_dsp_context();
        /*Assert RESET on LPE Processor*/
        csr.full = sst_shim_read(sst_drv_ctx->shim, SST_CSR);
        csr.full = csr.full | 0x2;
        /* Move the SST state to Suspended */
        mutex_lock(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->sst_state = SST_SUSPENDED;
        sst_shim_write(sst_drv_ctx->shim, SST_CSR, csr.full);
        mutex_unlock(&sst_drv_ctx->sst_lock);
        pci_set_drvdata(pci, sst_drv_ctx);
        pci_save_state(pci);
        pci_disable_device(pci);
        pci_set_power_state(pci, PCI_D3hot);
        return 0;
}

/**
* intel_sst_resume - PCI resume function
*
* @pci: PCI device structure
*
* This function is called by OS when a power event occurs
*/
int intel_sst_resume(struct pci_dev *pci)
{
        int ret = 0;

        pr_debug("intel_sst_resume called\n");
        if (sst_drv_ctx->sst_state != SST_SUSPENDED) {
                pr_err("SST is not in suspended state\n");
                return 0;
        }
        sst_drv_ctx = pci_get_drvdata(pci);
        pci_set_power_state(pci, PCI_D0);
        pci_restore_state(pci);
        ret = pci_enable_device(pci);
        if (ret)
                pr_err("device can't be enabled\n");

        mutex_lock(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->sst_state = SST_UN_INIT;
        mutex_unlock(&sst_drv_ctx->sst_lock);
        return 0;
}

/* The runtime_suspend/resume is pretty much similar to the legacy suspend/resume with the noted exception below:
 * The PCI core takes care of taking the system through D3hot and restoring it back to D0 and so there is
 * no need to duplicate that here.
 */
static int intel_sst_runtime_suspend(struct device *dev)
{
        union config_status_reg csr;

        pr_debug("intel_sst_runtime_suspend called\n");
        if (sst_drv_ctx->stream_cnt) {
                pr_err("active streams,not able to suspend\n");
                return -EBUSY;
        }
        /*save fw context*/
        sst_save_dsp_context();
        /*Assert RESET on LPE Processor*/
        csr.full = sst_shim_read(sst_drv_ctx->shim, SST_CSR);
        csr.full = csr.full | 0x2;
        /* Move the SST state to Suspended */
        mutex_lock(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->sst_state = SST_SUSPENDED;
        sst_shim_write(sst_drv_ctx->shim, SST_CSR, csr.full);
        mutex_unlock(&sst_drv_ctx->sst_lock);
        return 0;
}

static int intel_sst_runtime_resume(struct device *dev)
{

        pr_debug("intel_sst_runtime_resume called\n");
        if (sst_drv_ctx->sst_state != SST_SUSPENDED) {
                pr_err("SST is not in suspended state\n");
                return 0;
        }

        mutex_lock(&sst_drv_ctx->sst_lock);
        sst_drv_ctx->sst_state = SST_UN_INIT;
        mutex_unlock(&sst_drv_ctx->sst_lock);
        return 0;
}

static int intel_sst_runtime_idle(struct device *dev)
{
        pr_debug("runtime_idle called\n");
        if (sst_drv_ctx->stream_cnt == 0 && sst_drv_ctx->am_cnt == 0)
                pm_schedule_suspend(dev, SST_SUSPEND_DELAY);
        return -EBUSY;
}

static const struct dev_pm_ops intel_sst_pm = {
        .runtime_suspend = intel_sst_runtime_suspend,
        .runtime_resume = intel_sst_runtime_resume,
        .runtime_idle = intel_sst_runtime_idle,
};

/* PCI Routines */
static struct pci_device_id intel_sst_ids[] = {
        { PCI_VDEVICE(INTEL, SST_MRST_PCI_ID), 3},
        { PCI_VDEVICE(INTEL, SST_MFLD_PCI_ID), 6},
        { 0, }
};
MODULE_DEVICE_TABLE(pci, intel_sst_ids);

static struct pci_driver driver = {
        .name = SST_DRV_NAME,
        .id_table = intel_sst_ids,
        .probe = intel_sst_probe,
        .remove = __devexit_p(intel_sst_remove),
#ifdef CONFIG_PM
        .suspend = intel_sst_suspend,
        .resume = intel_sst_resume,
        .driver = {
                .pm = &intel_sst_pm,
        },
#endif
};

/**
* intel_sst_init - Module init function
*
* Registers with PCI
* Registers with /dev
* Init all data strutures
*/
static int __init intel_sst_init(void)
{
        /* Init all variables, data structure etc....*/
        int ret = 0;
        pr_debug("INFO: ******** SST DRIVER loading.. Ver: %s\n",
                                       SST_DRIVER_VERSION);

        mutex_init(&drv_ctx_lock);
        /* Register with PCI */
        ret = pci_register_driver(&driver);
        if (ret)
                pr_err("PCI register failed\n");
        return ret;
}

/**
* intel_sst_exit - Module exit function
*
* Unregisters with PCI
* Unregisters with /dev
* Frees all data strutures
*/
static void __exit intel_sst_exit(void)
{
        pci_unregister_driver(&driver);

        pr_debug("driver unloaded\n");
        sst_drv_ctx = NULL;
        return;
}

module_init(intel_sst_init);
module_exit(intel_sst_exit);