drivers/pnp/manager.c - LeafOS-Devices/android_kernel_samsung_exynos9820 - Gitiles

 /*
  * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
  *
  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
  */

 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/pnp.h>
 #include <linux/slab.h>
 #include <linux/bitmap.h>
 #include "base.h"

 DECLARE_MUTEX(pnp_res_mutex);

 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
 {
 	resource_size_t *start, *end;
 	unsigned long *flags;

 	if (idx >= PNP_MAX_PORT) {
 		pnp_err
 		    ("More than 4 ports is incompatible with pnp specifications.");
 		/* pretend we were successful so at least the manager won't try again */
 		return 1;
 	}

 	/* check if this resource has been manually set, if so skip */
 	if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
 		return 1;

 	start = &dev->res.port_resource[idx].start;
 	end = &dev->res.port_resource[idx].end;
 	flags = &dev->res.port_resource[idx].flags;

 	/* set the initial values */
 	*flags |= rule->flags | IORESOURCE_IO;
 	*flags &= ~IORESOURCE_UNSET;

 	if (!rule->size) {
 		*flags |= IORESOURCE_DISABLED;
 		return 1;	/* skip disabled resource requests */
 	}

 	*start = rule->min;
 	*end = *start + rule->size - 1;

 	/* run through until pnp_check_port is happy */
 	while (!pnp_check_port(dev, idx)) {
 		*start += rule->align;
 		*end = *start + rule->size - 1;
 		if (*start > rule->max || !rule->align)
 			return 0;
 	}
 	return 1;
 }

 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
 {
 	resource_size_t *start, *end;
 	unsigned long *flags;

 	if (idx >= PNP_MAX_MEM) {
 		pnp_err
 		    ("More than 8 mems is incompatible with pnp specifications.");
 		/* pretend we were successful so at least the manager won't try again */
 		return 1;
 	}

 	/* check if this resource has been manually set, if so skip */
 	if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
 		return 1;

 	start = &dev->res.mem_resource[idx].start;
 	end = &dev->res.mem_resource[idx].end;
 	flags = &dev->res.mem_resource[idx].flags;

 	/* set the initial values */
 	*flags |= rule->flags | IORESOURCE_MEM;
 	*flags &= ~IORESOURCE_UNSET;

 	/* convert pnp flags to standard Linux flags */
 	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
 		*flags |= IORESOURCE_READONLY;
 	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
 		*flags |= IORESOURCE_CACHEABLE;
 	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
 		*flags |= IORESOURCE_RANGELENGTH;
 	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
 		*flags |= IORESOURCE_SHADOWABLE;

 	if (!rule->size) {
 		*flags |= IORESOURCE_DISABLED;
 		return 1;	/* skip disabled resource requests */
 	}

 	*start = rule->min;
 	*end = *start + rule->size - 1;

 	/* run through until pnp_check_mem is happy */
 	while (!pnp_check_mem(dev, idx)) {
 		*start += rule->align;
 		*end = *start + rule->size - 1;
 		if (*start > rule->max || !rule->align)
 			return 0;
 	}
 	return 1;
 }

 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
 {
 	resource_size_t *start, *end;
 	unsigned long *flags;
 	int i;

 	/* IRQ priority: this table is good for i386 */
 	static unsigned short xtab[16] = {
 		5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
 	};

 	if (idx >= PNP_MAX_IRQ) {
 		pnp_err
 		    ("More than 2 irqs is incompatible with pnp specifications.");
 		/* pretend we were successful so at least the manager won't try again */
 		return 1;
 	}

 	/* check if this resource has been manually set, if so skip */
 	if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
 		return 1;

 	start = &dev->res.irq_resource[idx].start;
 	end = &dev->res.irq_resource[idx].end;
 	flags = &dev->res.irq_resource[idx].flags;

 	/* set the initial values */
 	*flags |= rule->flags | IORESOURCE_IRQ;
 	*flags &= ~IORESOURCE_UNSET;

 	if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
 		*flags |= IORESOURCE_DISABLED;
 		return 1;	/* skip disabled resource requests */
 	}

 	/* TBD: need check for >16 IRQ */
 	*start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
 	if (*start < PNP_IRQ_NR) {
 		*end = *start;
 		return 1;
 	}
 	for (i = 0; i < 16; i++) {
 		if (test_bit(xtab[i], rule->map)) {
 			*start = *end = xtab[i];
 			if (pnp_check_irq(dev, idx))
 				return 1;
 		}
 	}
 	return 0;
 }

 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
 {
 	resource_size_t *start, *end;
 	unsigned long *flags;
 	int i;

 	/* DMA priority: this table is good for i386 */
 	static unsigned short xtab[8] = {
 		1, 3, 5, 6, 7, 0, 2, 4
 	};

 	if (idx >= PNP_MAX_DMA) {
 		pnp_err
 		    ("More than 2 dmas is incompatible with pnp specifications.");
 		/* pretend we were successful so at least the manager won't try again */
 		return 1;
 	}

 	/* check if this resource has been manually set, if so skip */
 	if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
 		return 1;

 	start = &dev->res.dma_resource[idx].start;
 	end = &dev->res.dma_resource[idx].end;
 	flags = &dev->res.dma_resource[idx].flags;

 	/* set the initial values */
 	*flags |= rule->flags | IORESOURCE_DMA;
 	*flags &= ~IORESOURCE_UNSET;

 	if (!rule->map) {
 		*flags |= IORESOURCE_DISABLED;
 		return 1;	/* skip disabled resource requests */
 	}

 	for (i = 0; i < 8; i++) {
 		if (rule->map & (1 << xtab[i])) {
 			*start = *end = xtab[i];
 			if (pnp_check_dma(dev, idx))
 				return 1;
 		}
 	}
 	return 0;
 }

 /**
  * pnp_init_resources - Resets a resource table to default values.
  * @table: pointer to the desired resource table
  */
 void pnp_init_resource_table(struct pnp_resource_table *table)
 {
 	int idx;

 	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
 		table->irq_resource[idx].name = NULL;
 		table->irq_resource[idx].start = -1;
 		table->irq_resource[idx].end = -1;
 		table->irq_resource[idx].flags =
 		    IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
 		table->dma_resource[idx].name = NULL;
 		table->dma_resource[idx].start = -1;
 		table->dma_resource[idx].end = -1;
 		table->dma_resource[idx].flags =
 		    IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
 		table->port_resource[idx].name = NULL;
 		table->port_resource[idx].start = 0;
 		table->port_resource[idx].end = 0;
 		table->port_resource[idx].flags =
 		    IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
 		table->mem_resource[idx].name = NULL;
 		table->mem_resource[idx].start = 0;
 		table->mem_resource[idx].end = 0;
 		table->mem_resource[idx].flags =
 		    IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 }

 /**
  * pnp_clean_resources - clears resources that were not manually set
  * @res: the resources to clean
  */
 static void pnp_clean_resource_table(struct pnp_resource_table *res)
 {
 	int idx;

 	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
 		if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
 			continue;
 		res->irq_resource[idx].start = -1;
 		res->irq_resource[idx].end = -1;
 		res->irq_resource[idx].flags =
 		    IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
 		if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
 			continue;
 		res->dma_resource[idx].start = -1;
 		res->dma_resource[idx].end = -1;
 		res->dma_resource[idx].flags =
 		    IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
 		if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
 			continue;
 		res->port_resource[idx].start = 0;
 		res->port_resource[idx].end = 0;
 		res->port_resource[idx].flags =
 		    IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
 		if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
 			continue;
 		res->mem_resource[idx].start = 0;
 		res->mem_resource[idx].end = 0;
 		res->mem_resource[idx].flags =
 		    IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
 	}
 }

 /**
  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
  * @dev: pointer to the desired device
  * @depnum: the dependent function number
  *
  * Only set depnum to 0 if the device does not have dependent options.
  */
 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
 {
 	struct pnp_port *port;
 	struct pnp_mem *mem;
 	struct pnp_irq *irq;
 	struct pnp_dma *dma;
 	int nport = 0, nmem = 0, nirq = 0, ndma = 0;

 	if (!pnp_can_configure(dev))
 		return -ENODEV;

 	down(&pnp_res_mutex);
 	pnp_clean_resource_table(&dev->res);	/* start with a fresh slate */
 	if (dev->independent) {
 		port = dev->independent->port;
 		mem = dev->independent->mem;
 		irq = dev->independent->irq;
 		dma = dev->independent->dma;
 		while (port) {
 			if (!pnp_assign_port(dev, port, nport))
 				goto fail;
 			nport++;
 			port = port->next;
 		}
 		while (mem) {
 			if (!pnp_assign_mem(dev, mem, nmem))
 				goto fail;
 			nmem++;
 			mem = mem->next;
 		}
 		while (irq) {
 			if (!pnp_assign_irq(dev, irq, nirq))
 				goto fail;
 			nirq++;
 			irq = irq->next;
 		}
 		while (dma) {
 			if (!pnp_assign_dma(dev, dma, ndma))
 				goto fail;
 			ndma++;
 			dma = dma->next;
 		}
 	}

 	if (depnum) {
 		struct pnp_option *dep;
 		int i;
 		for (i = 1, dep = dev->dependent; i < depnum;
 		     i++, dep = dep->next)
 			if (!dep)
 				goto fail;
 		port = dep->port;
 		mem = dep->mem;
 		irq = dep->irq;
 		dma = dep->dma;
 		while (port) {
 			if (!pnp_assign_port(dev, port, nport))
 				goto fail;
 			nport++;
 			port = port->next;
 		}
 		while (mem) {
 			if (!pnp_assign_mem(dev, mem, nmem))
 				goto fail;
 			nmem++;
 			mem = mem->next;
 		}
 		while (irq) {
 			if (!pnp_assign_irq(dev, irq, nirq))
 				goto fail;
 			nirq++;
 			irq = irq->next;
 		}
 		while (dma) {
 			if (!pnp_assign_dma(dev, dma, ndma))
 				goto fail;
 			ndma++;
 			dma = dma->next;
 		}
 	} else if (dev->dependent)
 		goto fail;

 	up(&pnp_res_mutex);
 	return 1;

 fail:
 	pnp_clean_resource_table(&dev->res);
 	up(&pnp_res_mutex);
 	return 0;
 }

 /**
  * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
  * @dev: pointer to the desired device
  * @res: pointer to the new resource config
  * @mode: 0 or PNP_CONFIG_FORCE
  *
  * This function can be used by drivers that want to manually set thier resources.
  */
 int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table *res,
 			  int mode)
 {
 	int i;
 	struct pnp_resource_table *bak;

 	if (!pnp_can_configure(dev))
 		return -ENODEV;
 	bak = pnp_alloc(sizeof(struct pnp_resource_table));
 	if (!bak)
 		return -ENOMEM;
 	*bak = dev->res;

 	down(&pnp_res_mutex);
 	dev->res = *res;
 	if (!(mode & PNP_CONFIG_FORCE)) {
 		for (i = 0; i < PNP_MAX_PORT; i++) {
 			if (!pnp_check_port(dev, i))
 				goto fail;
 		}
 		for (i = 0; i < PNP_MAX_MEM; i++) {
 			if (!pnp_check_mem(dev, i))
 				goto fail;
 		}
 		for (i = 0; i < PNP_MAX_IRQ; i++) {
 			if (!pnp_check_irq(dev, i))
 				goto fail;
 		}
 		for (i = 0; i < PNP_MAX_DMA; i++) {
 			if (!pnp_check_dma(dev, i))
 				goto fail;
 		}
 	}
 	up(&pnp_res_mutex);

 	kfree(bak);
 	return 0;

 fail:
 	dev->res = *bak;
 	up(&pnp_res_mutex);
 	kfree(bak);
 	return -EINVAL;
 }

 /**
  * pnp_auto_config_dev - automatically assigns resources to a device
  * @dev: pointer to the desired device
  */
 int pnp_auto_config_dev(struct pnp_dev *dev)
 {
 	struct pnp_option *dep;
 	int i = 1;

 	if (!pnp_can_configure(dev)) {
 		pnp_dbg("Device %s does not support resource configuration.",
 			dev->dev.bus_id);
 		return -ENODEV;
 	}

 	if (!dev->dependent) {
 		if (pnp_assign_resources(dev, 0))
 			return 0;
 	} else {
 		dep = dev->dependent;
 		do {
 			if (pnp_assign_resources(dev, i))
 				return 0;
 			dep = dep->next;
 			i++;
 		} while (dep);
 	}

 	pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
 	return -EBUSY;
 }

 /**
  * pnp_start_dev - low-level start of the PnP device
  * @dev: pointer to the desired device
  *
  * assumes that resources have already been allocated
  */
 int pnp_start_dev(struct pnp_dev *dev)
 {
 	if (!pnp_can_write(dev)) {
 		pnp_dbg("Device %s does not support activation.",
 			dev->dev.bus_id);
 		return -EINVAL;
 	}

 	if (dev->protocol->set(dev, &dev->res) < 0) {
 		pnp_err("Failed to activate device %s.", dev->dev.bus_id);
 		return -EIO;
 	}

 	pnp_info("Device %s activated.", dev->dev.bus_id);
 	return 0;
 }

 /**
  * pnp_stop_dev - low-level disable of the PnP device
  * @dev: pointer to the desired device
  *
  * does not free resources
  */
 int pnp_stop_dev(struct pnp_dev *dev)
 {
 	if (!pnp_can_disable(dev)) {
 		pnp_dbg("Device %s does not support disabling.",
 			dev->dev.bus_id);
 		return -EINVAL;
 	}
 	if (dev->protocol->disable(dev) < 0) {
 		pnp_err("Failed to disable device %s.", dev->dev.bus_id);
 		return -EIO;
 	}

 	pnp_info("Device %s disabled.", dev->dev.bus_id);
 	return 0;
 }

 /**
  * pnp_activate_dev - activates a PnP device for use
  * @dev: pointer to the desired device
  *
  * does not validate or set resources so be careful.
  */
 int pnp_activate_dev(struct pnp_dev *dev)
 {
 	int error;

 	if (dev->active)
 		return 0;	/* the device is already active */

 	/* ensure resources are allocated */
 	if (pnp_auto_config_dev(dev))
 		return -EBUSY;

 	error = pnp_start_dev(dev);
 	if (error)
 		return error;

 	dev->active = 1;
 	return 1;
 }

 /**
  * pnp_disable_dev - disables device
  * @dev: pointer to the desired device
  *
  * inform the correct pnp protocol so that resources can be used by other devices
  */
 int pnp_disable_dev(struct pnp_dev *dev)
 {
 	int error;

 	if (!dev->active)
 		return 0;	/* the device is already disabled */

 	error = pnp_stop_dev(dev);
 	if (error)
 		return error;

 	dev->active = 0;

 	/* release the resources so that other devices can use them */
 	down(&pnp_res_mutex);
 	pnp_clean_resource_table(&dev->res);
 	up(&pnp_res_mutex);

 	return 1;
 }

 /**
  * pnp_resource_change - change one resource
  * @resource: pointer to resource to be changed
  * @start: start of region
  * @size: size of region
  */
 void pnp_resource_change(struct resource *resource, resource_size_t start,
 			 resource_size_t size)
 {
 	resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
 	resource->start = start;
 	resource->end = start + size - 1;
 }

 EXPORT_SYMBOL(pnp_manual_config_dev);
 EXPORT_SYMBOL(pnp_start_dev);
 EXPORT_SYMBOL(pnp_stop_dev);
 EXPORT_SYMBOL(pnp_activate_dev);
 EXPORT_SYMBOL(pnp_disable_dev);
 EXPORT_SYMBOL(pnp_resource_change);
 EXPORT_SYMBOL(pnp_init_resource_table);
	/*
	* manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
	*
	* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
	* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
	*/

	#include <linux/errno.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/pnp.h>
	#include <linux/slab.h>
	#include <linux/bitmap.h>
	#include "base.h"

	DECLARE_MUTEX(pnp_res_mutex);

	static int pnp_assign_port(struct pnp_dev dev, struct pnp_port rule, int idx)
	{
	resource_size_t start, end;
	unsigned long *flags;

	if (idx >= PNP_MAX_PORT) {
	pnp_err
	("More than 4 ports is incompatible with pnp specifications.");
	/* pretend we were successful so at least the manager won't try again */
	return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
	return 1;

	start = &dev->res.port_resource[idx].start;
	end = &dev->res.port_resource[idx].end;
	flags = &dev->res.port_resource[idx].flags;

	/* set the initial values */
	*flags \|= rule->flags \| IORESOURCE_IO;
	*flags &= ~IORESOURCE_UNSET;

	if (!rule->size) {
	*flags \|= IORESOURCE_DISABLED;
	return 1; /* skip disabled resource requests */
	}

	*start = rule->min;
	end = start + rule->size - 1;

	/* run through until pnp_check_port is happy */
	while (!pnp_check_port(dev, idx)) {
	*start += rule->align;
	end = start + rule->size - 1;
	if (*start > rule->max \|\| !rule->align)
	return 0;
	}
	return 1;
	}

	static int pnp_assign_mem(struct pnp_dev dev, struct pnp_mem rule, int idx)
	{
	resource_size_t start, end;
	unsigned long *flags;

	if (idx >= PNP_MAX_MEM) {
	pnp_err
	("More than 8 mems is incompatible with pnp specifications.");
	/* pretend we were successful so at least the manager won't try again */
	return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
	return 1;

	start = &dev->res.mem_resource[idx].start;
	end = &dev->res.mem_resource[idx].end;
	flags = &dev->res.mem_resource[idx].flags;

	/* set the initial values */
	*flags \|= rule->flags \| IORESOURCE_MEM;
	*flags &= ~IORESOURCE_UNSET;

	/* convert pnp flags to standard Linux flags */
	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
	*flags \|= IORESOURCE_READONLY;
	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
	*flags \|= IORESOURCE_CACHEABLE;
	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
	*flags \|= IORESOURCE_RANGELENGTH;
	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
	*flags \|= IORESOURCE_SHADOWABLE;

	if (!rule->size) {
	*flags \|= IORESOURCE_DISABLED;
	return 1; /* skip disabled resource requests */
	}

	*start = rule->min;
	end = start + rule->size - 1;

	/* run through until pnp_check_mem is happy */
	while (!pnp_check_mem(dev, idx)) {
	*start += rule->align;
	end = start + rule->size - 1;
	if (*start > rule->max \|\| !rule->align)
	return 0;
	}
	return 1;
	}

	static int pnp_assign_irq(struct pnp_dev dev, struct pnp_irq rule, int idx)
	{
	resource_size_t start, end;
	unsigned long *flags;
	int i;

	/* IRQ priority: this table is good for i386 */
	static unsigned short xtab[16] = {
	5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
	};

	if (idx >= PNP_MAX_IRQ) {
	pnp_err
	("More than 2 irqs is incompatible with pnp specifications.");
	/* pretend we were successful so at least the manager won't try again */
	return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
	return 1;

	start = &dev->res.irq_resource[idx].start;
	end = &dev->res.irq_resource[idx].end;
	flags = &dev->res.irq_resource[idx].flags;

	/* set the initial values */
	*flags \|= rule->flags \| IORESOURCE_IRQ;
	*flags &= ~IORESOURCE_UNSET;

	if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
	*flags \|= IORESOURCE_DISABLED;
	return 1; /* skip disabled resource requests */
	}

	/* TBD: need check for >16 IRQ */
	*start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
	if (*start < PNP_IRQ_NR) {
	end = start;
	return 1;
	}
	for (i = 0; i < 16; i++) {
	if (test_bit(xtab[i], rule->map)) {
	start = end = xtab[i];
	if (pnp_check_irq(dev, idx))
	return 1;
	}
	}
	return 0;
	}

	static int pnp_assign_dma(struct pnp_dev dev, struct pnp_dma rule, int idx)
	{
	resource_size_t start, end;
	unsigned long *flags;
	int i;

	/* DMA priority: this table is good for i386 */
	static unsigned short xtab[8] = {
	1, 3, 5, 6, 7, 0, 2, 4
	};

	if (idx >= PNP_MAX_DMA) {
	pnp_err
	("More than 2 dmas is incompatible with pnp specifications.");
	/* pretend we were successful so at least the manager won't try again */
	return 1;
	}

	/* check if this resource has been manually set, if so skip */
	if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
	return 1;

	start = &dev->res.dma_resource[idx].start;
	end = &dev->res.dma_resource[idx].end;
	flags = &dev->res.dma_resource[idx].flags;

	/* set the initial values */
	*flags \|= rule->flags \| IORESOURCE_DMA;
	*flags &= ~IORESOURCE_UNSET;

	if (!rule->map) {
	*flags \|= IORESOURCE_DISABLED;
	return 1; /* skip disabled resource requests */
	}

	for (i = 0; i < 8; i++) {
	if (rule->map & (1 << xtab[i])) {
	start = end = xtab[i];
	if (pnp_check_dma(dev, idx))
	return 1;
	}
	}
	return 0;
	}

	/**
	* pnp_init_resources - Resets a resource table to default values.
	* @table: pointer to the desired resource table
	*/
	void pnp_init_resource_table(struct pnp_resource_table *table)
	{
	int idx;

	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
	table->irq_resource[idx].name = NULL;
	table->irq_resource[idx].start = -1;
	table->irq_resource[idx].end = -1;
	table->irq_resource[idx].flags =
	IORESOURCE_IRQ \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
	table->dma_resource[idx].name = NULL;
	table->dma_resource[idx].start = -1;
	table->dma_resource[idx].end = -1;
	table->dma_resource[idx].flags =
	IORESOURCE_DMA \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
	table->port_resource[idx].name = NULL;
	table->port_resource[idx].start = 0;
	table->port_resource[idx].end = 0;
	table->port_resource[idx].flags =
	IORESOURCE_IO \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
	table->mem_resource[idx].name = NULL;
	table->mem_resource[idx].start = 0;
	table->mem_resource[idx].end = 0;
	table->mem_resource[idx].flags =
	IORESOURCE_MEM \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	}

	/**
	* pnp_clean_resources - clears resources that were not manually set
	* @res: the resources to clean
	*/
	static void pnp_clean_resource_table(struct pnp_resource_table *res)
	{
	int idx;

	for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
	if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
	continue;
	res->irq_resource[idx].start = -1;
	res->irq_resource[idx].end = -1;
	res->irq_resource[idx].flags =
	IORESOURCE_IRQ \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_DMA; idx++) {
	if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
	continue;
	res->dma_resource[idx].start = -1;
	res->dma_resource[idx].end = -1;
	res->dma_resource[idx].flags =
	IORESOURCE_DMA \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_PORT; idx++) {
	if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
	continue;
	res->port_resource[idx].start = 0;
	res->port_resource[idx].end = 0;
	res->port_resource[idx].flags =
	IORESOURCE_IO \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	for (idx = 0; idx < PNP_MAX_MEM; idx++) {
	if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
	continue;
	res->mem_resource[idx].start = 0;
	res->mem_resource[idx].end = 0;
	res->mem_resource[idx].flags =
	IORESOURCE_MEM \| IORESOURCE_AUTO \| IORESOURCE_UNSET;
	}
	}

	/**
	* pnp_assign_resources - assigns resources to the device based on the specified dependent number
	* @dev: pointer to the desired device
	* @depnum: the dependent function number
	*
	* Only set depnum to 0 if the device does not have dependent options.
	*/
	static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
	{
	struct pnp_port *port;
	struct pnp_mem *mem;
	struct pnp_irq *irq;
	struct pnp_dma *dma;
	int nport = 0, nmem = 0, nirq = 0, ndma = 0;

	if (!pnp_can_configure(dev))
	return -ENODEV;

	down(&pnp_res_mutex);
	pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
	if (dev->independent) {
	port = dev->independent->port;
	mem = dev->independent->mem;
	irq = dev->independent->irq;
	dma = dev->independent->dma;
	while (port) {
	if (!pnp_assign_port(dev, port, nport))
	goto fail;
	nport++;
	port = port->next;
	}
	while (mem) {
	if (!pnp_assign_mem(dev, mem, nmem))
	goto fail;
	nmem++;
	mem = mem->next;
	}
	while (irq) {
	if (!pnp_assign_irq(dev, irq, nirq))
	goto fail;
	nirq++;
	irq = irq->next;
	}
	while (dma) {
	if (!pnp_assign_dma(dev, dma, ndma))
	goto fail;
	ndma++;
	dma = dma->next;
	}
	}

	if (depnum) {
	struct pnp_option *dep;
	int i;
	for (i = 1, dep = dev->dependent; i < depnum;
	i++, dep = dep->next)
	if (!dep)
	goto fail;
	port = dep->port;
	mem = dep->mem;
	irq = dep->irq;
	dma = dep->dma;
	while (port) {
	if (!pnp_assign_port(dev, port, nport))
	goto fail;
	nport++;
	port = port->next;
	}
	while (mem) {
	if (!pnp_assign_mem(dev, mem, nmem))
	goto fail;
	nmem++;
	mem = mem->next;
	}
	while (irq) {
	if (!pnp_assign_irq(dev, irq, nirq))
	goto fail;
	nirq++;
	irq = irq->next;
	}
	while (dma) {
	if (!pnp_assign_dma(dev, dma, ndma))
	goto fail;
	ndma++;
	dma = dma->next;
	}
	} else if (dev->dependent)
	goto fail;

	up(&pnp_res_mutex);
	return 1;

	fail:
	pnp_clean_resource_table(&dev->res);
	up(&pnp_res_mutex);
	return 0;
	}

	/**
	* pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
	* @dev: pointer to the desired device
	* @res: pointer to the new resource config
	* @mode: 0 or PNP_CONFIG_FORCE
	*
	* This function can be used by drivers that want to manually set thier resources.
	*/
	int pnp_manual_config_dev(struct pnp_dev dev, struct pnp_resource_table res,
	int mode)
	{
	int i;
	struct pnp_resource_table *bak;

	if (!pnp_can_configure(dev))
	return -ENODEV;
	bak = pnp_alloc(sizeof(struct pnp_resource_table));
	if (!bak)
	return -ENOMEM;
	*bak = dev->res;

	down(&pnp_res_mutex);
	dev->res = *res;
	if (!(mode & PNP_CONFIG_FORCE)) {
	for (i = 0; i < PNP_MAX_PORT; i++) {
	if (!pnp_check_port(dev, i))
	goto fail;
	}
	for (i = 0; i < PNP_MAX_MEM; i++) {
	if (!pnp_check_mem(dev, i))
	goto fail;
	}
	for (i = 0; i < PNP_MAX_IRQ; i++) {
	if (!pnp_check_irq(dev, i))
	goto fail;
	}
	for (i = 0; i < PNP_MAX_DMA; i++) {
	if (!pnp_check_dma(dev, i))
	goto fail;
	}
	}
	up(&pnp_res_mutex);

	kfree(bak);
	return 0;

	fail:
	dev->res = *bak;
	up(&pnp_res_mutex);
	kfree(bak);
	return -EINVAL;
	}

	/**
	* pnp_auto_config_dev - automatically assigns resources to a device
	* @dev: pointer to the desired device
	*/
	int pnp_auto_config_dev(struct pnp_dev *dev)
	{
	struct pnp_option *dep;
	int i = 1;

	if (!pnp_can_configure(dev)) {
	pnp_dbg("Device %s does not support resource configuration.",
	dev->dev.bus_id);
	return -ENODEV;
	}

	if (!dev->dependent) {
	if (pnp_assign_resources(dev, 0))
	return 0;
	} else {
	dep = dev->dependent;
	do {
	if (pnp_assign_resources(dev, i))
	return 0;
	dep = dep->next;
	i++;
	} while (dep);
	}

	pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
	return -EBUSY;
	}

	/**
	* pnp_start_dev - low-level start of the PnP device
	* @dev: pointer to the desired device
	*
	* assumes that resources have already been allocated
	*/
	int pnp_start_dev(struct pnp_dev *dev)
	{
	if (!pnp_can_write(dev)) {
	pnp_dbg("Device %s does not support activation.",
	dev->dev.bus_id);
	return -EINVAL;
	}

	if (dev->protocol->set(dev, &dev->res) < 0) {
	pnp_err("Failed to activate device %s.", dev->dev.bus_id);
	return -EIO;
	}

	pnp_info("Device %s activated.", dev->dev.bus_id);
	return 0;
	}

	/**
	* pnp_stop_dev - low-level disable of the PnP device
	* @dev: pointer to the desired device
	*
	* does not free resources
	*/
	int pnp_stop_dev(struct pnp_dev *dev)
	{
	if (!pnp_can_disable(dev)) {
	pnp_dbg("Device %s does not support disabling.",
	dev->dev.bus_id);
	return -EINVAL;
	}
	if (dev->protocol->disable(dev) < 0) {
	pnp_err("Failed to disable device %s.", dev->dev.bus_id);
	return -EIO;
	}

	pnp_info("Device %s disabled.", dev->dev.bus_id);
	return 0;
	}

	/**
	* pnp_activate_dev - activates a PnP device for use
	* @dev: pointer to the desired device
	*
	* does not validate or set resources so be careful.
	*/
	int pnp_activate_dev(struct pnp_dev *dev)
	{
	int error;

	if (dev->active)
	return 0; /* the device is already active */

	/* ensure resources are allocated */
	if (pnp_auto_config_dev(dev))
	return -EBUSY;

	error = pnp_start_dev(dev);
	if (error)
	return error;

	dev->active = 1;
	return 1;
	}

	/**
	* pnp_disable_dev - disables device
	* @dev: pointer to the desired device
	*
	* inform the correct pnp protocol so that resources can be used by other devices
	*/
	int pnp_disable_dev(struct pnp_dev *dev)
	{
	int error;

	if (!dev->active)
	return 0; /* the device is already disabled */

	error = pnp_stop_dev(dev);
	if (error)
	return error;

	dev->active = 0;

	/* release the resources so that other devices can use them */
	down(&pnp_res_mutex);
	pnp_clean_resource_table(&dev->res);
	up(&pnp_res_mutex);

	return 1;
	}

	/**
	* pnp_resource_change - change one resource
	* @resource: pointer to resource to be changed
	* @start: start of region
	* @size: size of region
	*/
	void pnp_resource_change(struct resource *resource, resource_size_t start,
	resource_size_t size)
	{
	resource->flags &= ~(IORESOURCE_AUTO \| IORESOURCE_UNSET);
	resource->start = start;
	resource->end = start + size - 1;
	}

	EXPORT_SYMBOL(pnp_manual_config_dev);
	EXPORT_SYMBOL(pnp_start_dev);
	EXPORT_SYMBOL(pnp_stop_dev);
	EXPORT_SYMBOL(pnp_activate_dev);
	EXPORT_SYMBOL(pnp_disable_dev);
	EXPORT_SYMBOL(pnp_resource_change);
	EXPORT_SYMBOL(pnp_init_resource_table);