// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
 *      Bjorn Helgaas <bjorn.helgaas@hp.com>
 */
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include "../base.h"
#include "pnpacpi.h"

static void decode_irq_flags(struct pnp_dev *dev, int flags, u8 *triggering,
                             u8 *polarity, u8 *shareable)
{
        switch (flags & (IORESOURCE_IRQ_LOWLEVEL | IORESOURCE_IRQ_HIGHLEVEL |
                         IORESOURCE_IRQ_LOWEDGE  | IORESOURCE_IRQ_HIGHEDGE)) {
        case IORESOURCE_IRQ_LOWLEVEL:
                *triggering = ACPI_LEVEL_SENSITIVE;
                *polarity = ACPI_ACTIVE_LOW;
                break;
        case IORESOURCE_IRQ_HIGHLEVEL:
                *triggering = ACPI_LEVEL_SENSITIVE;
                *polarity = ACPI_ACTIVE_HIGH;
                break;
        case IORESOURCE_IRQ_LOWEDGE:
                *triggering = ACPI_EDGE_SENSITIVE;
                *polarity = ACPI_ACTIVE_LOW;
                break;
        case IORESOURCE_IRQ_HIGHEDGE:
                *triggering = ACPI_EDGE_SENSITIVE;
                *polarity = ACPI_ACTIVE_HIGH;
                break;
        default:
                dev_err(&dev->dev, "can't encode invalid IRQ mode %#x\n",
                        flags);
                *triggering = ACPI_EDGE_SENSITIVE;
                *polarity = ACPI_ACTIVE_HIGH;
                break;
        }

        if (flags & IORESOURCE_IRQ_SHAREABLE)
                *shareable = ACPI_SHARED;
        else
                *shareable = ACPI_EXCLUSIVE;
}

static int dma_flags(struct pnp_dev *dev, int type, int bus_master,
                     int transfer)
{
        int flags = 0;

        if (bus_master)
                flags |= IORESOURCE_DMA_MASTER;
        switch (type) {
        case ACPI_COMPATIBILITY:
                flags |= IORESOURCE_DMA_COMPATIBLE;
                break;
        case ACPI_TYPE_A:
                flags |= IORESOURCE_DMA_TYPEA;
                break;
        case ACPI_TYPE_B:
                flags |= IORESOURCE_DMA_TYPEB;
                break;
        case ACPI_TYPE_F:
                flags |= IORESOURCE_DMA_TYPEF;
                break;
        default:
                /* Set a default value ? */
                flags |= IORESOURCE_DMA_COMPATIBLE;
                dev_err(&dev->dev, "invalid DMA type %d\n", type);
        }
        switch (transfer) {
        case ACPI_TRANSFER_8:
                flags |= IORESOURCE_DMA_8BIT;
                break;
        case ACPI_TRANSFER_8_16:
                flags |= IORESOURCE_DMA_8AND16BIT;
                break;
        case ACPI_TRANSFER_16:
                flags |= IORESOURCE_DMA_16BIT;
                break;
        default:
                /* Set a default value ? */
                flags |= IORESOURCE_DMA_8AND16BIT;
                dev_err(&dev->dev, "invalid DMA transfer type %d\n", transfer);
        }

        return flags;
}

/*
 * Allocated Resources
 */

static void pnpacpi_add_irqresource(struct pnp_dev *dev, struct resource *r)
{
        if (!(r->flags & IORESOURCE_DISABLED))
                pcibios_penalize_isa_irq(r->start, 1);

        pnp_add_resource(dev, r);
}

/*
 * Device CSRs that do not appear in PCI config space should be described
 * via ACPI.  This would normally be done with Address Space Descriptors
 * marked as "consumer-only," but old versions of Windows and Linux ignore
 * the producer/consumer flag, so HP invented a vendor-defined resource to
 * describe the location and size of CSR space.
 */
static struct acpi_vendor_uuid hp_ccsr_uuid = {
        .subtype = 2,
        .data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,
            0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },
};

static int vendor_resource_matches(struct pnp_dev *dev,
                                   struct acpi_resource_vendor_typed *vendor,
                                   struct acpi_vendor_uuid *match,
                                   int expected_len)
{
        int uuid_len = sizeof(vendor->uuid);
        u8 uuid_subtype = vendor->uuid_subtype;
        u8 *uuid = vendor->uuid;
        int actual_len;

        /* byte_length includes uuid_subtype and uuid */
        actual_len = vendor->byte_length - uuid_len - 1;

        if (uuid_subtype == match->subtype &&
            uuid_len == sizeof(match->data) &&
            memcmp(uuid, match->data, uuid_len) == 0) {
                if (expected_len && expected_len != actual_len) {
                        dev_err(&dev->dev,
                                "wrong vendor descriptor size; expected %d, found %d bytes\n",
                                expected_len, actual_len);
                        return 0;
                }

                return 1;
        }

        return 0;
}

static void pnpacpi_parse_allocated_vendor(struct pnp_dev *dev,
                                    struct acpi_resource_vendor_typed *vendor)
{
        struct { u64 start, length; } range;

        if (vendor_resource_matches(dev, vendor, &hp_ccsr_uuid,
                                    sizeof(range))) {
                memcpy(&range, vendor->byte_data, sizeof(range));
                pnp_add_mem_resource(dev, range.start, range.start +
                                     range.length - 1, 0);
        }
}

static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
                                              void *data)
{
        struct pnp_dev *dev = data;
        struct acpi_resource_dma *dma;
        struct acpi_resource_vendor_typed *vendor_typed;
        struct acpi_resource_gpio *gpio;
        struct resource_win win = {{0}, 0};
        struct resource *r = &win.res;
        int i, flags;

        if (acpi_dev_resource_address_space(res, &win)
            || acpi_dev_resource_ext_address_space(res, &win)) {
                pnp_add_resource(dev, &win.res);
                return AE_OK;
        }

        r->flags = 0;
        if (acpi_dev_resource_interrupt(res, 0, r)) {
                pnpacpi_add_irqresource(dev, r);
                for (i = 1; acpi_dev_resource_interrupt(res, i, r); i++)
                        pnpacpi_add_irqresource(dev, r);

                if (i > 1) {
                        /*
                         * The IRQ encoder puts a single interrupt in each
                         * descriptor, so if a _CRS descriptor has more than
                         * one interrupt, we won't be able to re-encode it.
                         */
                        if (pnp_can_write(dev)) {
                                dev_warn(&dev->dev,
                                         "multiple interrupts in _CRS descriptor; configuration can't be changed\n");
                                dev->capabilities &= ~PNP_WRITE;
                        }
                }
                return AE_OK;
        } else if (acpi_gpio_get_irq_resource(res, &gpio)) {
                /*
                 * If the resource is GpioInt() type then extract the IRQ
                 * from GPIO resource and fill it into IRQ resource type.
                 */
                i = acpi_dev_gpio_irq_get(dev->data, 0);
                if (i >= 0) {
                        flags = acpi_dev_irq_flags(gpio->triggering,
                                                   gpio->polarity,
                                                   gpio->shareable,
                                                   gpio->wake_capable);
                } else {
                        flags = IORESOURCE_DISABLED;
                }
                pnp_add_irq_resource(dev, i, flags);
                return AE_OK;
        } else if (r->flags & IORESOURCE_DISABLED) {
                pnp_add_irq_resource(dev, 0, IORESOURCE_DISABLED);
                return AE_OK;
        }

        switch (res->type) {
        case ACPI_RESOURCE_TYPE_MEMORY24:
        case ACPI_RESOURCE_TYPE_MEMORY32:
        case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
                if (acpi_dev_resource_memory(res, r))
                        pnp_add_resource(dev, r);
                break;
        case ACPI_RESOURCE_TYPE_IO:
        case ACPI_RESOURCE_TYPE_FIXED_IO:
                if (acpi_dev_resource_io(res, r))
                        pnp_add_resource(dev, r);
                break;
        case ACPI_RESOURCE_TYPE_DMA:
                dma = &res->data.dma;
                if (dma->channel_count > 0 && dma->channels[0] != (u8) -1)
                        flags = dma_flags(dev, dma->type, dma->bus_master,
                                          dma->transfer);
                else
                        flags = IORESOURCE_DISABLED;
                pnp_add_dma_resource(dev, dma->channels[0], flags);
                break;

        case ACPI_RESOURCE_TYPE_START_DEPENDENT:
        case ACPI_RESOURCE_TYPE_END_DEPENDENT:
                break;

        case ACPI_RESOURCE_TYPE_VENDOR:
                vendor_typed = &res->data.vendor_typed;
                pnpacpi_parse_allocated_vendor(dev, vendor_typed);
                break;

        case ACPI_RESOURCE_TYPE_END_TAG:
                break;

        case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
                break;

        case ACPI_RESOURCE_TYPE_SERIAL_BUS:
                /* serial bus connections (I2C/SPI/UART) are not pnp */
                break;

        default:
                dev_warn(&dev->dev, "unknown resource type %d in _CRS\n",
                         res->type);
                return AE_ERROR;
        }

        return AE_OK;
}

int pnpacpi_parse_allocated_resource(struct pnp_dev *dev)
{
        struct acpi_device *acpi_dev = dev->data;
        acpi_handle handle = acpi_dev->handle;
        acpi_status status;

        pnp_dbg(&dev->dev, "parse allocated resources\n");

        pnp_init_resources(dev);

        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
                                     pnpacpi_allocated_resource, dev);

        if (ACPI_FAILURE(status)) {
                if (status != AE_NOT_FOUND)
                        dev_err(&dev->dev, "can't evaluate _CRS: %d", status);
                return -EPERM;
        }
        return 0;
}

static __init void pnpacpi_parse_dma_option(struct pnp_dev *dev,
                                            unsigned int option_flags,
                                            struct acpi_resource_dma *p)
{
        int i;
        unsigned char map = 0, flags;

        for (i = 0; i < p->channel_count; i++)
                map |= 1 << p->channels[i];

        flags = dma_flags(dev, p->type, p->bus_master, p->transfer);
        pnp_register_dma_resource(dev, option_flags, map, flags);
}

static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev,
                                            unsigned int option_flags,
                                            struct acpi_resource_irq *p)
{
        int i;
        pnp_irq_mask_t map;
        unsigned char flags;

        bitmap_zero(map.bits, PNP_IRQ_NR);
        for (i = 0; i < p->interrupt_count; i++)
                if (p->interrupts[i])
                        __set_bit(p->interrupts[i], map.bits);

        flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
        pnp_register_irq_resource(dev, option_flags, &map, flags);
}

static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev,
                                        unsigned int option_flags,
                                        struct acpi_resource_extended_irq *p)
{
        int i;
        pnp_irq_mask_t map;
        unsigned char flags;

        bitmap_zero(map.bits, PNP_IRQ_NR);
        for (i = 0; i < p->interrupt_count; i++) {
                if (p->interrupts[i]) {
                        if (p->interrupts[i] < PNP_IRQ_NR)
                                __set_bit(p->interrupts[i], map.bits);
                        else
                                dev_err(&dev->dev,
                                        "ignoring IRQ %d option (too large for %d entry bitmap)\n",
                                        p->interrupts[i], PNP_IRQ_NR);
                }
        }

        flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
        pnp_register_irq_resource(dev, option_flags, &map, flags);
}

static __init void pnpacpi_parse_port_option(struct pnp_dev *dev,
                                             unsigned int option_flags,
                                             struct acpi_resource_io *io)
{
        unsigned char flags = 0;

        if (io->io_decode == ACPI_DECODE_16)
                flags = IORESOURCE_IO_16BIT_ADDR;
        pnp_register_port_resource(dev, option_flags, io->minimum, io->maximum,
                                   io->alignment, io->address_length, flags);
}

static __init void pnpacpi_parse_fixed_port_option(struct pnp_dev *dev,
                                        unsigned int option_flags,
                                        struct acpi_resource_fixed_io *io)
{
        pnp_register_port_resource(dev, option_flags, io->address, io->address,
                                   0, io->address_length, IORESOURCE_IO_FIXED);
}

static __init void pnpacpi_parse_mem24_option(struct pnp_dev *dev,
                                              unsigned int option_flags,
                                              struct acpi_resource_memory24 *p)
{
        unsigned char flags = 0;

        if (p->write_protect == ACPI_READ_WRITE_MEMORY)
                flags = IORESOURCE_MEM_WRITEABLE;
        pnp_register_mem_resource(dev, option_flags, p->minimum, p->maximum,
                                  p->alignment, p->address_length, flags);
}

static __init void pnpacpi_parse_mem32_option(struct pnp_dev *dev,
                                              unsigned int option_flags,
                                              struct acpi_resource_memory32 *p)
{
        unsigned char flags = 0;

        if (p->write_protect == ACPI_READ_WRITE_MEMORY)
                flags = IORESOURCE_MEM_WRITEABLE;
        pnp_register_mem_resource(dev, option_flags, p->minimum, p->maximum,
                                  p->alignment, p->address_length, flags);
}

static __init void pnpacpi_parse_fixed_mem32_option(struct pnp_dev *dev,
                                        unsigned int option_flags,
                                        struct acpi_resource_fixed_memory32 *p)
{
        unsigned char flags = 0;

        if (p->write_protect == ACPI_READ_WRITE_MEMORY)
                flags = IORESOURCE_MEM_WRITEABLE;
        pnp_register_mem_resource(dev, option_flags, p->address, p->address,
                                  0, p->address_length, flags);
}

static __init void pnpacpi_parse_address_option(struct pnp_dev *dev,
                                                unsigned int option_flags,
                                                struct acpi_resource *r)
{
        struct acpi_resource_address64 addr, *p = &addr;
        acpi_status status;
        unsigned char flags = 0;

        status = acpi_resource_to_address64(r, p);
        if (ACPI_FAILURE(status)) {
                dev_warn(&dev->dev, "can't convert resource type %d\n",
                         r->type);
                return;
        }

        if (p->resource_type == ACPI_MEMORY_RANGE) {
                if (p->info.mem.write_protect == ACPI_READ_WRITE_MEMORY)
                        flags = IORESOURCE_MEM_WRITEABLE;
                pnp_register_mem_resource(dev, option_flags, p->address.minimum,
                                          p->address.minimum, 0, p->address.address_length,
                                          flags);
        } else if (p->resource_type == ACPI_IO_RANGE)
                pnp_register_port_resource(dev, option_flags, p->address.minimum,
                                           p->address.minimum, 0, p->address.address_length,
                                           IORESOURCE_IO_FIXED);
}

static __init void pnpacpi_parse_ext_address_option(struct pnp_dev *dev,
                                                    unsigned int option_flags,
                                                    struct acpi_resource *r)
{
        struct acpi_resource_extended_address64 *p = &r->data.ext_address64;
        unsigned char flags = 0;

        if (p->resource_type == ACPI_MEMORY_RANGE) {
                if (p->info.mem.write_protect == ACPI_READ_WRITE_MEMORY)
                        flags = IORESOURCE_MEM_WRITEABLE;
                pnp_register_mem_resource(dev, option_flags, p->address.minimum,
                                          p->address.minimum, 0, p->address.address_length,
                                          flags);
        } else if (p->resource_type == ACPI_IO_RANGE)
                pnp_register_port_resource(dev, option_flags, p->address.minimum,
                                           p->address.minimum, 0, p->address.address_length,
                                           IORESOURCE_IO_FIXED);
}

struct acpipnp_parse_option_s {
        struct pnp_dev *dev;
        unsigned int option_flags;
};

static __init acpi_status pnpacpi_option_resource(struct acpi_resource *res,
                                                  void *data)
{
        int priority;
        struct acpipnp_parse_option_s *parse_data = data;
        struct pnp_dev *dev = parse_data->dev;
        unsigned int option_flags = parse_data->option_flags;

        switch (res->type) {
        case ACPI_RESOURCE_TYPE_IRQ:
                pnpacpi_parse_irq_option(dev, option_flags, &res->data.irq);
                break;

        case ACPI_RESOURCE_TYPE_DMA:
                pnpacpi_parse_dma_option(dev, option_flags, &res->data.dma);
                break;

        case ACPI_RESOURCE_TYPE_START_DEPENDENT:
                switch (res->data.start_dpf.compatibility_priority) {
                case ACPI_GOOD_CONFIGURATION:
                        priority = PNP_RES_PRIORITY_PREFERRED;
                        break;

                case ACPI_ACCEPTABLE_CONFIGURATION:
                        priority = PNP_RES_PRIORITY_ACCEPTABLE;
                        break;

                case ACPI_SUB_OPTIMAL_CONFIGURATION:
                        priority = PNP_RES_PRIORITY_FUNCTIONAL;
                        break;
                default:
                        priority = PNP_RES_PRIORITY_INVALID;
                        break;
                }
                parse_data->option_flags = pnp_new_dependent_set(dev, priority);
                break;

        case ACPI_RESOURCE_TYPE_END_DEPENDENT:
                parse_data->option_flags = 0;
                break;

        case ACPI_RESOURCE_TYPE_IO:
                pnpacpi_parse_port_option(dev, option_flags, &res->data.io);
                break;

        case ACPI_RESOURCE_TYPE_FIXED_IO:
                pnpacpi_parse_fixed_port_option(dev, option_flags,
                                                &res->data.fixed_io);
                break;

        case ACPI_RESOURCE_TYPE_VENDOR:
        case ACPI_RESOURCE_TYPE_END_TAG:
                break;

        case ACPI_RESOURCE_TYPE_MEMORY24:
                pnpacpi_parse_mem24_option(dev, option_flags,
                                           &res->data.memory24);
                break;

        case ACPI_RESOURCE_TYPE_MEMORY32:
                pnpacpi_parse_mem32_option(dev, option_flags,
                                           &res->data.memory32);
                break;

        case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
                pnpacpi_parse_fixed_mem32_option(dev, option_flags,
                                                 &res->data.fixed_memory32);
                break;

        case ACPI_RESOURCE_TYPE_ADDRESS16:
        case ACPI_RESOURCE_TYPE_ADDRESS32:
        case ACPI_RESOURCE_TYPE_ADDRESS64:
                pnpacpi_parse_address_option(dev, option_flags, res);
                break;

        case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
                pnpacpi_parse_ext_address_option(dev, option_flags, res);
                break;

        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                pnpacpi_parse_ext_irq_option(dev, option_flags,
                                             &res->data.extended_irq);
                break;

        case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
                break;

        default:
                dev_warn(&dev->dev, "unknown resource type %d in _PRS\n",
                         res->type);
                return AE_ERROR;
        }

        return AE_OK;
}

int __init pnpacpi_parse_resource_option_data(struct pnp_dev *dev)
{
        struct acpi_device *acpi_dev = dev->data;
        acpi_handle handle = acpi_dev->handle;
        acpi_status status;
        struct acpipnp_parse_option_s parse_data;

        pnp_dbg(&dev->dev, "parse resource options\n");

        parse_data.dev = dev;
        parse_data.option_flags = 0;

        status = acpi_walk_resources(handle, METHOD_NAME__PRS,
                                     pnpacpi_option_resource, &parse_data);

        if (ACPI_FAILURE(status)) {
                if (status != AE_NOT_FOUND)
                        dev_err(&dev->dev, "can't evaluate _PRS: %d", status);
                return -EPERM;
        }
        return 0;
}

static int pnpacpi_supported_resource(struct acpi_resource *res)
{
        switch (res->type) {
        case ACPI_RESOURCE_TYPE_IRQ:
        case ACPI_RESOURCE_TYPE_DMA:
        case ACPI_RESOURCE_TYPE_IO:
        case ACPI_RESOURCE_TYPE_FIXED_IO:
        case ACPI_RESOURCE_TYPE_MEMORY24:
        case ACPI_RESOURCE_TYPE_MEMORY32:
        case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
        case ACPI_RESOURCE_TYPE_ADDRESS16:
        case ACPI_RESOURCE_TYPE_ADDRESS32:
        case ACPI_RESOURCE_TYPE_ADDRESS64:
        case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                return 1;
        }
        return 0;
}

/*
 * Set resource
 */
static acpi_status pnpacpi_count_resources(struct acpi_resource *res,
                                           void *data)
{
        int *res_cnt = data;

        if (pnpacpi_supported_resource(res))
                (*res_cnt)++;
        return AE_OK;
}

static acpi_status pnpacpi_type_resources(struct acpi_resource *res, void *data)
{
        struct acpi_resource **resource = data;

        if (pnpacpi_supported_resource(res)) {
                (*resource)->type = res->type;
                (*resource)->length = sizeof(struct acpi_resource);
                if (res->type == ACPI_RESOURCE_TYPE_IRQ)
                        (*resource)->data.irq.descriptor_length =
                                        res->data.irq.descriptor_length;
                (*resource)++;
        }

        return AE_OK;
}

int pnpacpi_build_resource_template(struct pnp_dev *dev,
                                    struct acpi_buffer *buffer)
{
        struct acpi_device *acpi_dev = dev->data;
        acpi_handle handle = acpi_dev->handle;
        struct acpi_resource *resource;
        int res_cnt = 0;
        acpi_status status;

        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
                                     pnpacpi_count_resources, &res_cnt);
        if (ACPI_FAILURE(status)) {
                dev_err(&dev->dev, "can't evaluate _CRS: %d\n", status);
                return -EINVAL;
        }
        if (!res_cnt)
                return -EINVAL;
        buffer->length = sizeof(struct acpi_resource) * (res_cnt + 1) + 1;
        buffer->pointer = kzalloc(buffer->length - 1, GFP_KERNEL);
        if (!buffer->pointer)
                return -ENOMEM;

        resource = (struct acpi_resource *)buffer->pointer;
        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
                                     pnpacpi_type_resources, &resource);
        if (ACPI_FAILURE(status)) {
                kfree(buffer->pointer);
                dev_err(&dev->dev, "can't evaluate _CRS: %d\n", status);
                return -EINVAL;
        }
        /* resource will pointer the end resource now */
        resource->type = ACPI_RESOURCE_TYPE_END_TAG;
        resource->length = sizeof(struct acpi_resource);

        return 0;
}

static void pnpacpi_encode_irq(struct pnp_dev *dev,
                               struct acpi_resource *resource,
                               struct resource *p)
{
        struct acpi_resource_irq *irq = &resource->data.irq;
        u8 triggering, polarity, shareable;

        if (!pnp_resource_enabled(p)) {
                irq->interrupt_count = 0;
                pnp_dbg(&dev->dev, "  encode irq (%s)\n",
                        p ? "disabled" : "missing");
                return;
        }

        decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
        irq->triggering = triggering;
        irq->polarity = polarity;
        irq->shareable = shareable;
        irq->interrupt_count = 1;
        irq->interrupts[0] = p->start;

        pnp_dbg(&dev->dev, "  encode irq %d %s %s %s (%d-byte descriptor)\n",
                (int) p->start,
                triggering == ACPI_LEVEL_SENSITIVE ? "level" : "edge",
                polarity == ACPI_ACTIVE_LOW ? "low" : "high",
                irq->shareable == ACPI_SHARED ? "shared" : "exclusive",
                irq->descriptor_length);
}

static void pnpacpi_encode_ext_irq(struct pnp_dev *dev,
                                   struct acpi_resource *resource,
                                   struct resource *p)
{
        struct acpi_resource_extended_irq *extended_irq = &resource->data.extended_irq;
        u8 triggering, polarity, shareable;

        if (!pnp_resource_enabled(p)) {
                extended_irq->interrupt_count = 0;
                pnp_dbg(&dev->dev, "  encode extended irq (%s)\n",
                        p ? "disabled" : "missing");
                return;
        }

        decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
        extended_irq->producer_consumer = ACPI_CONSUMER;
        extended_irq->triggering = triggering;
        extended_irq->polarity = polarity;
        extended_irq->shareable = shareable;
        extended_irq->interrupt_count = 1;
        extended_irq->interrupts[0] = p->start;

        pnp_dbg(&dev->dev, "  encode irq %d %s %s %s\n", (int) p->start,
                triggering == ACPI_LEVEL_SENSITIVE ? "level" : "edge",
                polarity == ACPI_ACTIVE_LOW ? "low" : "high",
                extended_irq->shareable == ACPI_SHARED ? "shared" : "exclusive");
}

static void pnpacpi_encode_dma(struct pnp_dev *dev,
                               struct acpi_resource *resource,
                               struct resource *p)
{
        struct acpi_resource_dma *dma = &resource->data.dma;

        if (!pnp_resource_enabled(p)) {
                dma->channel_count = 0;
                pnp_dbg(&dev->dev, "  encode dma (%s)\n",
                        p ? "disabled" : "missing");
                return;
        }

        /* Note: pnp_assign_dma will copy pnp_dma->flags into p->flags */
        switch (p->flags & IORESOURCE_DMA_SPEED_MASK) {
        case IORESOURCE_DMA_TYPEA:
                dma->type = ACPI_TYPE_A;
                break;
        case IORESOURCE_DMA_TYPEB:
                dma->type = ACPI_TYPE_B;
                break;
        case IORESOURCE_DMA_TYPEF:
                dma->type = ACPI_TYPE_F;
                break;
        default:
                dma->type = ACPI_COMPATIBILITY;
        }

        switch (p->flags & IORESOURCE_DMA_TYPE_MASK) {
        case IORESOURCE_DMA_8BIT:
                dma->transfer = ACPI_TRANSFER_8;
                break;
        case IORESOURCE_DMA_8AND16BIT:
                dma->transfer = ACPI_TRANSFER_8_16;
                break;
        default:
                dma->transfer = ACPI_TRANSFER_16;
        }

        dma->bus_master = !!(p->flags & IORESOURCE_DMA_MASTER);
        dma->channel_count = 1;
        dma->channels[0] = p->start;

        pnp_dbg(&dev->dev, "  encode dma %d "
                "type %#x transfer %#x master %d\n",
                (int) p->start, dma->type, dma->transfer, dma->bus_master);
}

static void pnpacpi_encode_io(struct pnp_dev *dev,
                              struct acpi_resource *resource,
                              struct resource *p)
{
        struct acpi_resource_io *io = &resource->data.io;

        if (pnp_resource_enabled(p)) {
                /* Note: pnp_assign_port copies pnp_port->flags into p->flags */
                io->io_decode = (p->flags & IORESOURCE_IO_16BIT_ADDR) ?
                    ACPI_DECODE_16 : ACPI_DECODE_10;
                io->minimum = p->start;
                io->maximum = p->end;
                io->alignment = 0;      /* Correct? */
                io->address_length = resource_size(p);
        } else {
                io->minimum = 0;
                io->address_length = 0;
        }

        pnp_dbg(&dev->dev, "  encode io %#x-%#x decode %#x\n", io->minimum,
                io->minimum + io->address_length - 1, io->io_decode);
}

static void pnpacpi_encode_fixed_io(struct pnp_dev *dev,
                                    struct acpi_resource *resource,
                                    struct resource *p)
{
        struct acpi_resource_fixed_io *fixed_io = &resource->data.fixed_io;

        if (pnp_resource_enabled(p)) {
                fixed_io->address = p->start;
                fixed_io->address_length = resource_size(p);
        } else {
                fixed_io->address = 0;
                fixed_io->address_length = 0;
        }

        pnp_dbg(&dev->dev, "  encode fixed_io %#x-%#x\n", fixed_io->address,
                fixed_io->address + fixed_io->address_length - 1);
}

static void pnpacpi_encode_mem24(struct pnp_dev *dev,
                                 struct acpi_resource *resource,
                                 struct resource *p)
{
        struct acpi_resource_memory24 *memory24 = &resource->data.memory24;

        if (pnp_resource_enabled(p)) {
                /* Note: pnp_assign_mem copies pnp_mem->flags into p->flags */
                memory24->write_protect = p->flags & IORESOURCE_MEM_WRITEABLE ?
                    ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
                memory24->minimum = p->start;
                memory24->maximum = p->end;
                memory24->alignment = 0;
                memory24->address_length = resource_size(p);
        } else {
                memory24->minimum = 0;
                memory24->address_length = 0;
        }

        pnp_dbg(&dev->dev, "  encode mem24 %#x-%#x write_protect %#x\n",
                memory24->minimum,
                memory24->minimum + memory24->address_length - 1,
                memory24->write_protect);
}

static void pnpacpi_encode_mem32(struct pnp_dev *dev,
                                 struct acpi_resource *resource,
                                 struct resource *p)
{
        struct acpi_resource_memory32 *memory32 = &resource->data.memory32;

        if (pnp_resource_enabled(p)) {
                memory32->write_protect = p->flags & IORESOURCE_MEM_WRITEABLE ?
                    ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
                memory32->minimum = p->start;
                memory32->maximum = p->end;
                memory32->alignment = 0;
                memory32->address_length = resource_size(p);
        } else {
                memory32->minimum = 0;
                memory32->alignment = 0;
        }

        pnp_dbg(&dev->dev, "  encode mem32 %#x-%#x write_protect %#x\n",
                memory32->minimum,
                memory32->minimum + memory32->address_length - 1,
                memory32->write_protect);
}

static void pnpacpi_encode_fixed_mem32(struct pnp_dev *dev,
                                       struct acpi_resource *resource,
                                       struct resource *p)
{
        struct acpi_resource_fixed_memory32 *fixed_memory32 = &resource->data.fixed_memory32;

        if (pnp_resource_enabled(p)) {
                fixed_memory32->write_protect =
                    p->flags & IORESOURCE_MEM_WRITEABLE ?
                    ACPI_READ_WRITE_MEMORY : ACPI_READ_ONLY_MEMORY;
                fixed_memory32->address = p->start;
                fixed_memory32->address_length = resource_size(p);
        } else {
                fixed_memory32->address = 0;
                fixed_memory32->address_length = 0;
        }

        pnp_dbg(&dev->dev, "  encode fixed_mem32 %#x-%#x write_protect %#x\n",
                fixed_memory32->address,
                fixed_memory32->address + fixed_memory32->address_length - 1,
                fixed_memory32->write_protect);
}

int pnpacpi_encode_resources(struct pnp_dev *dev, struct acpi_buffer *buffer)
{
        int i = 0;
        /* pnpacpi_build_resource_template allocates extra mem */
        int res_cnt = (buffer->length - 1) / sizeof(struct acpi_resource) - 1;
        struct acpi_resource *resource = buffer->pointer;
        unsigned int port = 0, irq = 0, dma = 0, mem = 0;

        pnp_dbg(&dev->dev, "encode %d resources\n", res_cnt);
        while (i < res_cnt) {
                switch (resource->type) {
                case ACPI_RESOURCE_TYPE_IRQ:
                        pnpacpi_encode_irq(dev, resource,
                               pnp_get_resource(dev, IORESOURCE_IRQ, irq));
                        irq++;
                        break;

                case ACPI_RESOURCE_TYPE_DMA:
                        pnpacpi_encode_dma(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_DMA, dma));
                        dma++;
                        break;
                case ACPI_RESOURCE_TYPE_IO:
                        pnpacpi_encode_io(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_IO, port));
                        port++;
                        break;
                case ACPI_RESOURCE_TYPE_FIXED_IO:
                        pnpacpi_encode_fixed_io(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_IO, port));
                        port++;
                        break;
                case ACPI_RESOURCE_TYPE_MEMORY24:
                        pnpacpi_encode_mem24(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_MEM, mem));
                        mem++;
                        break;
                case ACPI_RESOURCE_TYPE_MEMORY32:
                        pnpacpi_encode_mem32(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_MEM, mem));
                        mem++;
                        break;
                case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
                        pnpacpi_encode_fixed_mem32(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_MEM, mem));
                        mem++;
                        break;
                case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                        pnpacpi_encode_ext_irq(dev, resource,
                                pnp_get_resource(dev, IORESOURCE_IRQ, irq));
                        irq++;
                        break;
                case ACPI_RESOURCE_TYPE_START_DEPENDENT:
                case ACPI_RESOURCE_TYPE_END_DEPENDENT:
                case ACPI_RESOURCE_TYPE_VENDOR:
                case ACPI_RESOURCE_TYPE_END_TAG:
                case ACPI_RESOURCE_TYPE_ADDRESS16:
                case ACPI_RESOURCE_TYPE_ADDRESS32:
                case ACPI_RESOURCE_TYPE_ADDRESS64:
                case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
                case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
                default:        /* other type */
                        dev_warn(&dev->dev,
                                 "can't encode unknown resource type %d\n",
                                 resource->type);
                        return -EINVAL;
                }
                resource++;
                i++;
        }
        return 0;
}