1 files changed, 948 insertions, 0 deletions

diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
new file mode 100644
index 0000000000..4f05f61039
--- /dev/null
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -0,0 +1,948 @@
+// 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)
+{
+	if (vendor_resource_matches(dev, vendor, &hp_ccsr_uuid, 16)) {
+		u64 start, length;
+
+		memcpy(&start, vendor->byte_data, sizeof(start));
+		memcpy(&length, vendor->byte_data + 8, sizeof(length));
+
+		pnp_add_mem_resource(dev, start, start + 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;
+}