linux/drivers/pnp/pnpacpi/rsparser.c

/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@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; either version 2, or (at your option) any
 * later version.
 *
 * 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
 */
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/pnp.h>
#include "../base.h"
#include "pnpacpi.h"

#ifdef CONFIG_IA64
#define valid_IRQ(i) (1)
#else
#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
#endif

/*
 * Allocated Resources
 */
static int irq_flags(int triggering, int polarity, int shareable)
{
	int flags;

	if (triggering == ACPI_LEVEL_SENSITIVE) {
		if (polarity == ACPI_ACTIVE_LOW)
			flags = IORESOURCE_IRQ_LOWLEVEL;
		else
			flags = IORESOURCE_IRQ_HIGHLEVEL;
	} else {
		if (polarity == ACPI_ACTIVE_LOW)
			flags = IORESOURCE_IRQ_LOWEDGE;
		else
			flags = IORESOURCE_IRQ_HIGHEDGE;
	}

	if (shareable)
		flags |= IORESOURCE_IRQ_SHAREABLE;

	return flags;
}

static void decode_irq_flags(int flag, int *triggering, int *polarity)
{
	switch (flag) {
	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;
	}
}

static void pnpacpi_parse_allocated_irqresource(struct pnp_dev *dev,
						u32 gsi, int triggering,
						int polarity, int shareable)
{
	int irq, flags;
	int p, t;

	if (!valid_IRQ(gsi))
		return;

	/*
	 * in IO-APIC mode, use overrided attribute. Two reasons:
	 * 1. BIOS bug in DSDT
	 * 2. BIOS uses IO-APIC mode Interrupt Source Override
	 */
	if (!acpi_get_override_irq(gsi, &t, &p)) {
		t = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
		p = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;

		if (triggering != t || polarity != p) {
			dev_warn(&dev->dev, "IRQ %d override to %s, %s\n",
				gsi, t ? "edge":"level", p ? "low":"high");
			triggering = t;
			polarity = p;
		}
	}

	flags = irq_flags(triggering, polarity, shareable);
	irq = acpi_register_gsi(gsi, triggering, polarity);
	if (irq >= 0)
		pcibios_penalize_isa_irq(irq, 1);
	else
		flags |= IORESOURCE_DISABLED;

	pnp_add_irq_resource(dev, irq, flags);
}

static int dma_flags(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;
		pnp_err("Invalid DMA 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;
		pnp_err("Invalid DMA transfer type");
	}

	return flags;
}

static void pnpacpi_parse_allocated_ioresource(struct pnp_dev *dev, u64 start,
					       u64 len, int io_decode)
{
	int flags = 0;
	u64 end = start + len - 1;

	if (io_decode == ACPI_DECODE_16)
		flags |= PNP_PORT_FLAG_16BITADDR;
	if (len == 0 || end >= 0x10003)
		flags |= IORESOURCE_DISABLED;

	pnp_add_io_resource(dev, start, end, flags);
}

static void pnpacpi_parse_allocated_memresource(struct pnp_dev *dev,
						u64 mem, u64 len,
						int write_protect)
{
	struct resource *res;
	int i;
	static unsigned char warned;

	for (i = 0; i < PNP_MAX_MEM; i++) {
		res = pnp_get_resource(dev, IORESOURCE_MEM, i);
		if (!pnp_resource_valid(res))
			break;
	}
	if (i < PNP_MAX_MEM) {
		res->flags = IORESOURCE_MEM;	// Also clears _UNSET flag
		if (len <= 0) {
			res->flags |= IORESOURCE_DISABLED;
			return;
		}
		if (write_protect == ACPI_READ_WRITE_MEMORY)
			res->flags |= IORESOURCE_MEM_WRITEABLE;

		res->start = mem;
		res->end = mem + len - 1;
	} else if (!warned) {
		printk(KERN_WARNING "pnpacpi: exceeded the max number of mem "
				"resources: %d\n", PNP_MAX_MEM);
		warned = 1;
	}
}

static void pnpacpi_parse_allocated_address_space(struct pnp_dev *dev,
						  struct acpi_resource *res)
{
	struct acpi_resource_address64 addr, *p = &addr;
	acpi_status status;

	status = acpi_resource_to_address64(res, p);
	if (!ACPI_SUCCESS(status)) {
		dev_warn(&dev->dev, "failed to convert resource type %d\n",
			 res->type);
		return;
	}

	if (p->producer_consumer == ACPI_PRODUCER)
		return;

	if (p->resource_type == ACPI_MEMORY_RANGE)
		pnpacpi_parse_allocated_memresource(dev,
			p->minimum, p->address_length,
			p->info.mem.write_protect);
	else if (p->resource_type == ACPI_IO_RANGE)
		pnpacpi_parse_allocated_ioresource(dev,
			p->minimum, p->address_length,
			p->granularity == 0xfff ? ACPI_DECODE_10 :
				ACPI_DECODE_16);
}

static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
					      void *data)
{
	struct pnp_dev *dev = data;
	struct acpi_resource_irq *irq;
	struct acpi_resource_dma *dma;
	struct acpi_resource_io *io;
	struct acpi_resource_fixed_io *fixed_io;
	struct acpi_resource_memory24 *memory24;
	struct acpi_resource_memory32 *memory32;
	struct acpi_resource_fixed_memory32 *fixed_memory32;
	struct acpi_resource_extended_irq *extended_irq;
	int i, flags;

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_IRQ:
		/*
		 * Per spec, only one interrupt per descriptor is allowed in
		 * _CRS, but some firmware violates this, so parse them all.
		 */
		irq = &res->data.irq;
		for (i = 0; i < irq->interrupt_count; i++) {
			pnpacpi_parse_allocated_irqresource(dev,
				irq->interrupts[i],
				irq->triggering,
				irq->polarity,
				irq->sharable);
		}
		break;

	case ACPI_RESOURCE_TYPE_DMA:
		dma = &res->data.dma;
		if (dma->channel_count > 0) {
			flags = dma_flags(dma->type, dma->bus_master,
					  dma->transfer);
			if (dma->channels[0] == (u8) -1)
				flags |= IORESOURCE_DISABLED;
			pnp_add_dma_resource(dev, dma->channels[0], flags);
		}
		break;

	case ACPI_RESOURCE_TYPE_IO:
		io = &res->data.io;
		pnpacpi_parse_allocated_ioresource(dev,
			io->minimum,
			io->address_length,
			io->io_decode);
		break;

	case ACPI_RESOURCE_TYPE_START_DEPENDENT:
	case ACPI_RESOURCE_TYPE_END_DEPENDENT:
		break;

	case ACPI_RESOURCE_TYPE_FIXED_IO:
		fixed_io = &res->data.fixed_io;
		pnpacpi_parse_allocated_ioresource(dev,
			fixed_io->address,
			fixed_io->address_length,
			ACPI_DECODE_10);
		break;

	case ACPI_RESOURCE_TYPE_VENDOR:
		break;

	case ACPI_RESOURCE_TYPE_END_TAG:
		break;

	case ACPI_RESOURCE_TYPE_MEMORY24:
		memory24 = &res->data.memory24;
		pnpacpi_parse_allocated_memresource(dev,
			memory24->minimum,
			memory24->address_length,
			memory24->write_protect);
		break;
	case ACPI_RESOURCE_TYPE_MEMORY32:
		memory32 = &res->data.memory32;
		pnpacpi_parse_allocated_memresource(dev,
			memory32->minimum,
			memory32->address_length,
			memory32->write_protect);
		break;
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		fixed_memory32 = &res->data.fixed_memory32;
		pnpacpi_parse_allocated_memresource(dev,
			fixed_memory32->address,
			fixed_memory32->address_length,
			fixed_memory32->write_protect);
		break;
	case ACPI_RESOURCE_TYPE_ADDRESS16:
	case ACPI_RESOURCE_TYPE_ADDRESS32:
	case ACPI_RESOURCE_TYPE_ADDRESS64:
		pnpacpi_parse_allocated_address_space(dev, res);
		break;

	case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
		if (res->data.ext_address64.producer_consumer == ACPI_PRODUCER)
			return AE_OK;
		break;

	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
		extended_irq = &res->data.extended_irq;
		if (extended_irq->producer_consumer == ACPI_PRODUCER)
			return AE_OK;

		for (i = 0; i < extended_irq->interrupt_count; i++) {
			pnpacpi_parse_allocated_irqresource(dev,
				extended_irq->interrupts[i],
				extended_irq->triggering,
				extended_irq->polarity,
				extended_irq->sharable);
		}
		break;

	case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
		break;

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

	return AE_OK;
}

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

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

	pnp_init_resources(dev);

	return acpi_walk_resources(handle, METHOD_NAME__CRS,
				   pnpacpi_allocated_resource, dev);
}

static __init void pnpacpi_parse_dma_option(struct pnp_dev *dev,
					    struct pnp_option *option,
					    struct acpi_resource_dma *p)
{
	int i;
	struct pnp_dma *dma;

	if (p->channel_count == 0)
		return;
	dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
	if (!dma)
		return;

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

	dma->flags = dma_flags(p->type, p->bus_master, p->transfer);

	pnp_register_dma_resource(dev, option, dma);
}

static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev,
					    struct pnp_option *option,
					    struct acpi_resource_irq *p)
{
	int i;
	struct pnp_irq *irq;

	if (p->interrupt_count == 0)
		return;
	irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
	if (!irq)
		return;

	for (i = 0; i < p->interrupt_count; i++)
		if (p->interrupts[i])
			__set_bit(p->interrupts[i], irq->map);
	irq->flags = irq_flags(p->triggering, p->polarity, p->sharable);

	pnp_register_irq_resource(dev, option, irq);
}

static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev,
						struct pnp_option *option,
					struct acpi_resource_extended_irq *p)
{
	int i;
	struct pnp_irq *irq;

	if (p->interrupt_count == 0)
		return;
	irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
	if (!irq)
		return;

	for (i = 0; i < p->interrupt_count; i++)
		if (p->interrupts[i])
			__set_bit(p->interrupts[i], irq->map);
	irq->flags = irq_flags(p->triggering, p->polarity, p->sharable);

	pnp_register_irq_resource(dev, option, irq);
}

static __init void pnpacpi_parse_port_option(struct pnp_dev *dev,
					     struct pnp_option *option,
					     struct acpi_resource_io *io)
{
	struct pnp_port *port;

	if (io->address_length == 0)
		return;
	port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
	if (!port)
		return;
	port->min = io->minimum;
	port->max = io->maximum;
	port->align = io->alignment;
	port->size = io->address_length;
	port->flags = ACPI_DECODE_16 == io->io_decode ?
	    PNP_PORT_FLAG_16BITADDR : 0;
	pnp_register_port_resource(dev, option, port);
}

static __init void pnpacpi_parse_fixed_port_option(struct pnp_dev *dev,
						   struct pnp_option *option,
					struct acpi_resource_fixed_io *io)
{
	struct pnp_port *port;

	if (io->address_length == 0)
		return;
	port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
	if (!port)
		return;
	port->min = port->max = io->address;
	port->size = io->address_length;
	port->align = 0;
	port->flags = PNP_PORT_FLAG_FIXED;
	pnp_register_port_resource(dev, option, port);
}

static __init void pnpacpi_parse_mem24_option(struct pnp_dev *dev,
					      struct pnp_option *option,
					      struct acpi_resource_memory24 *p)
{
	struct pnp_mem *mem;

	if (p->address_length == 0)
		return;
	mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
	if (!mem)
		return;
	mem->min = p->minimum;
	mem->max = p->maximum;
	mem->align = p->alignment;
	mem->size = p->address_length;

	mem->flags = (ACPI_READ_WRITE_MEMORY == p->write_protect) ?
	    IORESOURCE_MEM_WRITEABLE : 0;

	pnp_register_mem_resource(dev, option, mem);
}

static __init void pnpacpi_parse_mem32_option(struct pnp_dev *dev,
					      struct pnp_option *option,
					      struct acpi_resource_memory32 *p)
{
	struct pnp_mem *mem;

	if (p->address_length == 0)
		return;
	mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
	if (!mem)
		return;
	mem->min = p->minimum;
	mem->max = p->maximum;
	mem->align = p->alignment;
	mem->size = p->address_length;

	mem->flags = (ACPI_READ_WRITE_MEMORY == p->write_protect) ?
	    IORESOURCE_MEM_WRITEABLE : 0;

	pnp_register_mem_resource(dev, option, mem);
}

static __init void pnpacpi_parse_fixed_mem32_option(struct pnp_dev *dev,
						    struct pnp_option *option,
					struct acpi_resource_fixed_memory32 *p)
{
	struct pnp_mem *mem;

	if (p->address_length == 0)
		return;
	mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
	if (!mem)
		return;
	mem->min = mem->max = p->address;
	mem->size = p->address_length;
	mem->align = 0;

	mem->flags = (ACPI_READ_WRITE_MEMORY == p->write_protect) ?
	    IORESOURCE_MEM_WRITEABLE : 0;

	pnp_register_mem_resource(dev, option, mem);
}

static __init void pnpacpi_parse_address_option(struct pnp_dev *dev,
						struct pnp_option *option,
						struct acpi_resource *r)
{
	struct acpi_resource_address64 addr, *p = &addr;
	acpi_status status;
	struct pnp_mem *mem;
	struct pnp_port *port;

	status = acpi_resource_to_address64(r, p);
	if (!ACPI_SUCCESS(status)) {
		pnp_warn("PnPACPI: failed to convert resource type %d",
			 r->type);
		return;
	}

	if (p->address_length == 0)
		return;

	if (p->resource_type == ACPI_MEMORY_RANGE) {
		mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
		if (!mem)
			return;
		mem->min = mem->max = p->minimum;
		mem->size = p->address_length;
		mem->align = 0;
		mem->flags = (p->info.mem.write_protect ==
			      ACPI_READ_WRITE_MEMORY) ? IORESOURCE_MEM_WRITEABLE
		    : 0;
		pnp_register_mem_resource(dev, option, mem);
	} else if (p->resource_type == ACPI_IO_RANGE) {
		port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
		if (!port)
			return;
		port->min = port->max = p->minimum;
		port->size = p->address_length;
		port->align = 0;
		port->flags = PNP_PORT_FLAG_FIXED;
		pnp_register_port_resource(dev, option, port);
	}
}

struct acpipnp_parse_option_s {
	struct pnp_option *option;
	struct pnp_option *option_independent;
	struct pnp_dev *dev;
};

static __init acpi_status pnpacpi_option_resource(struct acpi_resource *res,
						  void *data)
{
	int priority = 0;
	struct acpipnp_parse_option_s *parse_data = data;
	struct pnp_dev *dev = parse_data->dev;
	struct pnp_option *option = parse_data->option;

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

	case ACPI_RESOURCE_TYPE_DMA:
		pnpacpi_parse_dma_option(dev, option, &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;
		}
		/* TBD: Consider performance/robustness bits */
		option = pnp_register_dependent_option(dev, priority);
		if (!option)
			return AE_ERROR;
		parse_data->option = option;
		break;

	case ACPI_RESOURCE_TYPE_END_DEPENDENT:
		/*only one EndDependentFn is allowed */
		if (!parse_data->option_independent) {
			dev_warn(&dev->dev, "more than one EndDependentFn "
				 "in _PRS\n");
			return AE_ERROR;
		}
		parse_data->option = parse_data->option_independent;
		parse_data->option_independent = NULL;
		dev_dbg(&dev->dev, "end dependent options\n");
		break;

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

	case ACPI_RESOURCE_TYPE_FIXED_IO:
		pnpacpi_parse_fixed_port_option(dev, option,
					        &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, &res->data.memory24);
		break;

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

	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		pnpacpi_parse_fixed_mem32_option(dev, option,
						 &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, res);
		break;

	case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
		break;

	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
		pnpacpi_parse_ext_irq_option(dev, option,
					     &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;
}

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

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

	parse_data.option = pnp_register_independent_option(dev);
	if (!parse_data.option)
		return AE_ERROR;
	parse_data.option_independent = parse_data.option;
	parse_data.dev = dev;
	status = acpi_walk_resources(handle, METHOD_NAME__PRS,
				     pnpacpi_option_resource, &parse_data);

	return status;
}

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_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);
		(*resource)++;
	}

	return AE_OK;
}

int pnpacpi_build_resource_template(struct pnp_dev *dev,
				    struct acpi_buffer *buffer)
{
	acpi_handle handle = dev->data;
	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\n");
		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\n");
		return -EINVAL;
	}
	/* resource will pointer the end resource now */
	resource->type = ACPI_RESOURCE_TYPE_END_TAG;

	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;
	int triggering, polarity;

	decode_irq_flags(p->flags & IORESOURCE_BITS, &triggering, &polarity);
	irq->triggering = triggering;
	irq->polarity = polarity;
	if (triggering == ACPI_EDGE_SENSITIVE)
		irq->sharable = ACPI_EXCLUSIVE;
	else
		irq->sharable = ACPI_SHARED;
	irq->interrupt_count = 1;
	irq->interrupts[0] = p->start;

	dev_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",
		irq->sharable == ACPI_SHARED ? "shared" : "exclusive");
}

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;
	int triggering, polarity;

	decode_irq_flags(p->flags & IORESOURCE_BITS, &triggering, &polarity);
	extended_irq->producer_consumer = ACPI_CONSUMER;
	extended_irq->triggering = triggering;
	extended_irq->polarity = polarity;
	if (triggering == ACPI_EDGE_SENSITIVE)
		extended_irq->sharable = ACPI_EXCLUSIVE;
	else
		extended_irq->sharable = ACPI_SHARED;
	extended_irq->interrupt_count = 1;
	extended_irq->interrupts[0] = p->start;

	dev_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->sharable == 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;

	/* 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;

	dev_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;

	/* Note: pnp_assign_port will copy pnp_port->flags into p->flags */
	io->io_decode = (p->flags & PNP_PORT_FLAG_16BITADDR) ?
	    ACPI_DECODE_16 : ACPI_DECODE_10;
	io->minimum = p->start;
	io->maximum = p->end;
	io->alignment = 0;	/* Correct? */
	io->address_length = p->end - p->start + 1;

	dev_dbg(&dev->dev, "  encode io %#llx-%#llx decode %#x\n",
		(unsigned long long) p->start, (unsigned long long) p->end,
		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;

	fixed_io->address = p->start;
	fixed_io->address_length = p->end - p->start + 1;

	dev_dbg(&dev->dev, "  encode fixed_io %#llx-%#llx\n",
		(unsigned long long) p->start, (unsigned long long) p->end);
}

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

	/* Note: pnp_assign_mem will copy 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 = p->end - p->start + 1;

	dev_dbg(&dev->dev, "  encode mem24 %#llx-%#llx write_protect %#x\n",
		(unsigned long long) p->start, (unsigned long long) p->end,
		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;

	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 = p->end - p->start + 1;

	dev_dbg(&dev->dev, "  encode mem32 %#llx-%#llx write_protect %#x\n",
		(unsigned long long) p->start, (unsigned long long) p->end,
		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;

	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 = p->end - p->start + 1;

	dev_dbg(&dev->dev, "  encode fixed_mem32 %#llx-%#llx "
		"write_protect %#x\n",
		(unsigned long long) p->start, (unsigned long long) p->end,
		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;
	int port = 0, irq = 0, dma = 0, mem = 0;

	dev_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;
}