drivers/pnp/interface.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * interface.c - contains everything related to the user interface
  *
  * Some code, especially possible resource dumping is based on isapnp_proc.c (c) Jaroslav Kysela <perex@perex.cz>
  * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
  *	Bjorn Helgaas <bjorn.helgaas@hp.com>
  */

 #include <linux/pnp.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <linux/types.h>
 #include <linux/stat.h>
 #include <linux/ctype.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>

 #include <linux/uaccess.h>

 #include "base.h"

 struct pnp_info_buffer {
 	char *buffer;		/* pointer to begin of buffer */
 	char *curr;		/* current position in buffer */
 	unsigned long size;	/* current size */
 	unsigned long len;	/* total length of buffer */
 	int stop;		/* stop flag */
 	int error;		/* error code */
 };

 typedef struct pnp_info_buffer pnp_info_buffer_t;

 static int pnp_printf(pnp_info_buffer_t * buffer, char *fmt, ...)
 {
 	va_list args;
 	int res;

 	if (buffer->stop || buffer->error)
 		return 0;
 	va_start(args, fmt);
 	res = vsnprintf(buffer->curr, buffer->len - buffer->size, fmt, args);
 	va_end(args);
 	if (buffer->size + res >= buffer->len) {
 		buffer->stop = 1;
 		return 0;
 	}
 	buffer->curr += res;
 	buffer->size += res;
 	return res;
 }

 static void pnp_print_port(pnp_info_buffer_t * buffer, char *space,
 			   struct pnp_port *port)
 {
 	pnp_printf(buffer, "%sport %#llx-%#llx, align %#llx, size %#llx, "
 		   "%i-bit address decoding\n", space,
 		   (unsigned long long) port->min,
 		   (unsigned long long) port->max,
 		   port->align ? ((unsigned long long) port->align - 1) : 0,
 		   (unsigned long long) port->size,
 		   port->flags & IORESOURCE_IO_16BIT_ADDR ? 16 : 10);
 }

 static void pnp_print_irq(pnp_info_buffer_t * buffer, char *space,
 			  struct pnp_irq *irq)
 {
 	int first = 1, i;

 	pnp_printf(buffer, "%sirq ", space);
 	for (i = 0; i < PNP_IRQ_NR; i++)
 		if (test_bit(i, irq->map.bits)) {
 			if (!first) {
 				pnp_printf(buffer, ",");
 			} else {
 				first = 0;
 			}
 			if (i == 2 || i == 9)
 				pnp_printf(buffer, "2/9");
 			else
 				pnp_printf(buffer, "%i", i);
 		}
 	if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
 		pnp_printf(buffer, "<none>");
 	if (irq->flags & IORESOURCE_IRQ_HIGHEDGE)
 		pnp_printf(buffer, " High-Edge");
 	if (irq->flags & IORESOURCE_IRQ_LOWEDGE)
 		pnp_printf(buffer, " Low-Edge");
 	if (irq->flags & IORESOURCE_IRQ_HIGHLEVEL)
 		pnp_printf(buffer, " High-Level");
 	if (irq->flags & IORESOURCE_IRQ_LOWLEVEL)
 		pnp_printf(buffer, " Low-Level");
 	if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
 		pnp_printf(buffer, " (optional)");
 	pnp_printf(buffer, "\n");
 }

 static void pnp_print_dma(pnp_info_buffer_t * buffer, char *space,
 			  struct pnp_dma *dma)
 {
 	int first = 1, i;
 	char *s;

 	pnp_printf(buffer, "%sdma ", space);
 	for (i = 0; i < 8; i++)
 		if (dma->map & (1 << i)) {
 			if (!first) {
 				pnp_printf(buffer, ",");
 			} else {
 				first = 0;
 			}
 			pnp_printf(buffer, "%i", i);
 		}
 	if (!dma->map)
 		pnp_printf(buffer, "<none>");
 	switch (dma->flags & IORESOURCE_DMA_TYPE_MASK) {
 	case IORESOURCE_DMA_8BIT:
 		s = "8-bit";
 		break;
 	case IORESOURCE_DMA_8AND16BIT:
 		s = "8-bit&16-bit";
 		break;
 	default:
 		s = "16-bit";
 	}
 	pnp_printf(buffer, " %s", s);
 	if (dma->flags & IORESOURCE_DMA_MASTER)
 		pnp_printf(buffer, " master");
 	if (dma->flags & IORESOURCE_DMA_BYTE)
 		pnp_printf(buffer, " byte-count");
 	if (dma->flags & IORESOURCE_DMA_WORD)
 		pnp_printf(buffer, " word-count");
 	switch (dma->flags & IORESOURCE_DMA_SPEED_MASK) {
 	case IORESOURCE_DMA_TYPEA:
 		s = "type-A";
 		break;
 	case IORESOURCE_DMA_TYPEB:
 		s = "type-B";
 		break;
 	case IORESOURCE_DMA_TYPEF:
 		s = "type-F";
 		break;
 	default:
 		s = "compatible";
 		break;
 	}
 	pnp_printf(buffer, " %s\n", s);
 }

 static void pnp_print_mem(pnp_info_buffer_t * buffer, char *space,
 			  struct pnp_mem *mem)
 {
 	char *s;

 	pnp_printf(buffer, "%sMemory %#llx-%#llx, align %#llx, size %#llx",
 		   space, (unsigned long long) mem->min,
 		   (unsigned long long) mem->max,
 		   (unsigned long long) mem->align,
 		   (unsigned long long) mem->size);
 	if (mem->flags & IORESOURCE_MEM_WRITEABLE)
 		pnp_printf(buffer, ", writeable");
 	if (mem->flags & IORESOURCE_MEM_CACHEABLE)
 		pnp_printf(buffer, ", cacheable");
 	if (mem->flags & IORESOURCE_MEM_RANGELENGTH)
 		pnp_printf(buffer, ", range-length");
 	if (mem->flags & IORESOURCE_MEM_SHADOWABLE)
 		pnp_printf(buffer, ", shadowable");
 	if (mem->flags & IORESOURCE_MEM_EXPANSIONROM)
 		pnp_printf(buffer, ", expansion ROM");
 	switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
 	case IORESOURCE_MEM_8BIT:
 		s = "8-bit";
 		break;
 	case IORESOURCE_MEM_8AND16BIT:
 		s = "8-bit&16-bit";
 		break;
 	case IORESOURCE_MEM_32BIT:
 		s = "32-bit";
 		break;
 	default:
 		s = "16-bit";
 	}
 	pnp_printf(buffer, ", %s\n", s);
 }

 static void pnp_print_option(pnp_info_buffer_t * buffer, char *space,
 			     struct pnp_option *option)
 {
 	switch (option->type) {
 	case IORESOURCE_IO:
 		pnp_print_port(buffer, space, &option->u.port);
 		break;
 	case IORESOURCE_MEM:
 		pnp_print_mem(buffer, space, &option->u.mem);
 		break;
 	case IORESOURCE_IRQ:
 		pnp_print_irq(buffer, space, &option->u.irq);
 		break;
 	case IORESOURCE_DMA:
 		pnp_print_dma(buffer, space, &option->u.dma);
 		break;
 	}
 }

 static ssize_t options_show(struct device *dmdev, struct device_attribute *attr,
 			    char *buf)
 {
 	struct pnp_dev *dev = to_pnp_dev(dmdev);
 	pnp_info_buffer_t *buffer;
 	struct pnp_option *option;
 	int ret, dep = 0, set = 0;
 	char *indent;

 	buffer = pnp_alloc(sizeof(pnp_info_buffer_t));
 	if (!buffer)
 		return -ENOMEM;

 	buffer->len = PAGE_SIZE;
 	buffer->buffer = buf;
 	buffer->curr = buffer->buffer;

 	list_for_each_entry(option, &dev->options, list) {
 		if (pnp_option_is_dependent(option)) {
 			indent = "  ";
 			if (!dep || pnp_option_set(option) != set) {
 				set = pnp_option_set(option);
 				dep = 1;
 				pnp_printf(buffer, "Dependent: %02i - "
 					   "Priority %s\n", set,
 					   pnp_option_priority_name(option));
 			}
 		} else {
 			dep = 0;
 			indent = "";
 		}
 		pnp_print_option(buffer, indent, option);
 	}

 	ret = (buffer->curr - buf);
 	kfree(buffer);
 	return ret;
 }
 static DEVICE_ATTR_RO(options);

 static ssize_t resources_show(struct device *dmdev,
 			      struct device_attribute *attr, char *buf)
 {
 	struct pnp_dev *dev = to_pnp_dev(dmdev);
 	pnp_info_buffer_t *buffer;
 	struct pnp_resource *pnp_res;
 	struct resource *res;
 	int ret;

 	if (!dev)
 		return -EINVAL;

 	buffer = pnp_alloc(sizeof(pnp_info_buffer_t));
 	if (!buffer)
 		return -ENOMEM;

 	buffer->len = PAGE_SIZE;
 	buffer->buffer = buf;
 	buffer->curr = buffer->buffer;

 	pnp_printf(buffer, "state = %s\n", dev->active ? "active" : "disabled");

 	list_for_each_entry(pnp_res, &dev->resources, list) {
 		res = &pnp_res->res;

 		pnp_printf(buffer, pnp_resource_type_name(res));

 		if (res->flags & IORESOURCE_DISABLED) {
 			pnp_printf(buffer, " disabled\n");
 			continue;
 		}

 		switch (pnp_resource_type(res)) {
 		case IORESOURCE_IO:
 		case IORESOURCE_MEM:
 		case IORESOURCE_BUS:
 			pnp_printf(buffer, " %#llx-%#llx%s\n",
 				   (unsigned long long) res->start,
 				   (unsigned long long) res->end,
 				   res->flags & IORESOURCE_WINDOW ?
 					" window" : "");
 			break;
 		case IORESOURCE_IRQ:
 		case IORESOURCE_DMA:
 			pnp_printf(buffer, " %lld\n",
 				   (unsigned long long) res->start);
 			break;
 		}
 	}

 	ret = (buffer->curr - buf);
 	kfree(buffer);
 	return ret;
 }

 static char *pnp_get_resource_value(char *buf,
 				    unsigned long type,
 				    resource_size_t *start,
 				    resource_size_t *end,
 				    unsigned long *flags)
 {
 	if (start)
 		*start = 0;
 	if (end)
 		*end = 0;
 	if (flags)
 		*flags = 0;

 	/* TBD: allow for disabled resources */

 	buf = skip_spaces(buf);
 	if (start) {
 		*start = simple_strtoull(buf, &buf, 0);
 		if (end) {
 			buf = skip_spaces(buf);
 			if (*buf == '-') {
 				buf = skip_spaces(buf + 1);
 				*end = simple_strtoull(buf, &buf, 0);
 			} else
 				*end = *start;
 		}
 	}

 	/* TBD: allow for additional flags, e.g., IORESOURCE_WINDOW */

 	return buf;
 }

 static ssize_t resources_store(struct device *dmdev,
 			       struct device_attribute *attr, const char *ubuf,
 			       size_t count)
 {
 	struct pnp_dev *dev = to_pnp_dev(dmdev);
 	char *buf = (void *)ubuf;
 	int retval = 0;

 	if (dev->status & PNP_ATTACHED) {
 		retval = -EBUSY;
 		dev_info(&dev->dev, "in use; can't configure\n");
 		goto done;
 	}

 	buf = skip_spaces(buf);
 	if (!strncasecmp(buf, "disable", 7)) {
 		retval = pnp_disable_dev(dev);
 		goto done;
 	}
 	if (!strncasecmp(buf, "activate", 8)) {
 		retval = pnp_activate_dev(dev);
 		goto done;
 	}
 	if (!strncasecmp(buf, "fill", 4)) {
 		if (dev->active)
 			goto done;
 		retval = pnp_auto_config_dev(dev);
 		goto done;
 	}
 	if (!strncasecmp(buf, "auto", 4)) {
 		if (dev->active)
 			goto done;
 		pnp_init_resources(dev);
 		retval = pnp_auto_config_dev(dev);
 		goto done;
 	}
 	if (!strncasecmp(buf, "clear", 5)) {
 		if (dev->active)
 			goto done;
 		pnp_init_resources(dev);
 		goto done;
 	}
 	if (!strncasecmp(buf, "get", 3)) {
 		mutex_lock(&pnp_res_mutex);
 		if (pnp_can_read(dev))
 			dev->protocol->get(dev);
 		mutex_unlock(&pnp_res_mutex);
 		goto done;
 	}
 	if (!strncasecmp(buf, "set", 3)) {
 		resource_size_t start;
 		resource_size_t end;
 		unsigned long flags;

 		if (dev->active)
 			goto done;
 		buf += 3;
 		pnp_init_resources(dev);
 		mutex_lock(&pnp_res_mutex);
 		while (1) {
 			buf = skip_spaces(buf);
 			if (!strncasecmp(buf, "io", 2)) {
 				buf = pnp_get_resource_value(buf + 2,
 							     IORESOURCE_IO,
 							     &start, &end,
 							     &flags);
 				pnp_add_io_resource(dev, start, end, flags);
 			} else if (!strncasecmp(buf, "mem", 3)) {
 				buf = pnp_get_resource_value(buf + 3,
 							     IORESOURCE_MEM,
 							     &start, &end,
 							     &flags);
 				pnp_add_mem_resource(dev, start, end, flags);
 			} else if (!strncasecmp(buf, "irq", 3)) {
 				buf = pnp_get_resource_value(buf + 3,
 							     IORESOURCE_IRQ,
 							     &start, NULL,
 							     &flags);
 				pnp_add_irq_resource(dev, start, flags);
 			} else if (!strncasecmp(buf, "dma", 3)) {
 				buf = pnp_get_resource_value(buf + 3,
 							     IORESOURCE_DMA,
 							     &start, NULL,
 							     &flags);
 				pnp_add_dma_resource(dev, start, flags);
 			} else if (!strncasecmp(buf, "bus", 3)) {
 				buf = pnp_get_resource_value(buf + 3,
 							     IORESOURCE_BUS,
 							     &start, &end,
 							     NULL);
 				pnp_add_bus_resource(dev, start, end);
 			} else
 				break;
 		}
 		mutex_unlock(&pnp_res_mutex);
 		goto done;
 	}

 done:
 	if (retval < 0)
 		return retval;
 	return count;
 }
 static DEVICE_ATTR_RW(resources);

 static ssize_t id_show(struct device *dmdev, struct device_attribute *attr,
 		       char *buf)
 {
 	char *str = buf;
 	struct pnp_dev *dev = to_pnp_dev(dmdev);
 	struct pnp_id *pos = dev->id;

 	while (pos) {
 		str += sprintf(str, "%s\n", pos->id);
 		pos = pos->next;
 	}
 	return (str - buf);
 }
 static DEVICE_ATTR_RO(id);

 static struct attribute *pnp_dev_attrs[] = {
 	&dev_attr_resources.attr,
 	&dev_attr_options.attr,
 	&dev_attr_id.attr,
 	NULL,
 };

 static const struct attribute_group pnp_dev_group = {
 	.attrs = pnp_dev_attrs,
 };

 const struct attribute_group *pnp_dev_groups[] = {
 	&pnp_dev_group,
 	NULL,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* interface.c - contains everything related to the user interface
	*
	* Some code, especially possible resource dumping is based on isapnp_proc.c (c) Jaroslav Kysela <perex@perex.cz>
	* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
	* Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
	* Bjorn Helgaas <bjorn.helgaas@hp.com>
	*/

	#include <linux/pnp.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/list.h>
	#include <linux/types.h>
	#include <linux/stat.h>
	#include <linux/ctype.h>
	#include <linux/slab.h>
	#include <linux/mutex.h>

	#include <linux/uaccess.h>

	#include "base.h"

	struct pnp_info_buffer {
	char buffer; / pointer to begin of buffer */
	char curr; / current position in buffer */
	unsigned long size; /* current size */
	unsigned long len; /* total length of buffer */
	int stop; /* stop flag */
	int error; /* error code */
	};

	typedef struct pnp_info_buffer pnp_info_buffer_t;

	static int pnp_printf(pnp_info_buffer_t * buffer, char *fmt, ...)
	{
	va_list args;
	int res;

	if (buffer->stop \|\| buffer->error)
	return 0;
	va_start(args, fmt);
	res = vsnprintf(buffer->curr, buffer->len - buffer->size, fmt, args);
	va_end(args);
	if (buffer->size + res >= buffer->len) {
	buffer->stop = 1;
	return 0;
	}
	buffer->curr += res;
	buffer->size += res;
	return res;
	}

	static void pnp_print_port(pnp_info_buffer_t * buffer, char *space,
	struct pnp_port *port)
	{
	pnp_printf(buffer, "%sport %#llx-%#llx, align %#llx, size %#llx, "
	"%i-bit address decoding\n", space,
	(unsigned long long) port->min,
	(unsigned long long) port->max,
	port->align ? ((unsigned long long) port->align - 1) : 0,
	(unsigned long long) port->size,
	port->flags & IORESOURCE_IO_16BIT_ADDR ? 16 : 10);
	}

	static void pnp_print_irq(pnp_info_buffer_t * buffer, char *space,
	struct pnp_irq *irq)
	{
	int first = 1, i;

	pnp_printf(buffer, "%sirq ", space);
	for (i = 0; i < PNP_IRQ_NR; i++)
	if (test_bit(i, irq->map.bits)) {
	if (!first) {
	pnp_printf(buffer, ",");
	} else {
	first = 0;
	}
	if (i == 2 \|\| i == 9)
	pnp_printf(buffer, "2/9");
	else
	pnp_printf(buffer, "%i", i);
	}
	if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
	pnp_printf(buffer, "<none>");
	if (irq->flags & IORESOURCE_IRQ_HIGHEDGE)
	pnp_printf(buffer, " High-Edge");
	if (irq->flags & IORESOURCE_IRQ_LOWEDGE)
	pnp_printf(buffer, " Low-Edge");
	if (irq->flags & IORESOURCE_IRQ_HIGHLEVEL)
	pnp_printf(buffer, " High-Level");
	if (irq->flags & IORESOURCE_IRQ_LOWLEVEL)
	pnp_printf(buffer, " Low-Level");
	if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
	pnp_printf(buffer, " (optional)");
	pnp_printf(buffer, "\n");
	}

	static void pnp_print_dma(pnp_info_buffer_t * buffer, char *space,
	struct pnp_dma *dma)
	{
	int first = 1, i;
	char *s;

	pnp_printf(buffer, "%sdma ", space);
	for (i = 0; i < 8; i++)
	if (dma->map & (1 << i)) {
	if (!first) {
	pnp_printf(buffer, ",");
	} else {
	first = 0;
	}
	pnp_printf(buffer, "%i", i);
	}
	if (!dma->map)
	pnp_printf(buffer, "<none>");
	switch (dma->flags & IORESOURCE_DMA_TYPE_MASK) {
	case IORESOURCE_DMA_8BIT:
	s = "8-bit";
	break;
	case IORESOURCE_DMA_8AND16BIT:
	s = "8-bit&16-bit";
	break;
	default:
	s = "16-bit";
	}
	pnp_printf(buffer, " %s", s);
	if (dma->flags & IORESOURCE_DMA_MASTER)
	pnp_printf(buffer, " master");
	if (dma->flags & IORESOURCE_DMA_BYTE)
	pnp_printf(buffer, " byte-count");
	if (dma->flags & IORESOURCE_DMA_WORD)
	pnp_printf(buffer, " word-count");
	switch (dma->flags & IORESOURCE_DMA_SPEED_MASK) {
	case IORESOURCE_DMA_TYPEA:
	s = "type-A";
	break;
	case IORESOURCE_DMA_TYPEB:
	s = "type-B";
	break;
	case IORESOURCE_DMA_TYPEF:
	s = "type-F";
	break;
	default:
	s = "compatible";
	break;
	}
	pnp_printf(buffer, " %s\n", s);
	}

	static void pnp_print_mem(pnp_info_buffer_t * buffer, char *space,
	struct pnp_mem *mem)
	{
	char *s;

	pnp_printf(buffer, "%sMemory %#llx-%#llx, align %#llx, size %#llx",
	space, (unsigned long long) mem->min,
	(unsigned long long) mem->max,
	(unsigned long long) mem->align,
	(unsigned long long) mem->size);
	if (mem->flags & IORESOURCE_MEM_WRITEABLE)
	pnp_printf(buffer, ", writeable");
	if (mem->flags & IORESOURCE_MEM_CACHEABLE)
	pnp_printf(buffer, ", cacheable");
	if (mem->flags & IORESOURCE_MEM_RANGELENGTH)
	pnp_printf(buffer, ", range-length");
	if (mem->flags & IORESOURCE_MEM_SHADOWABLE)
	pnp_printf(buffer, ", shadowable");
	if (mem->flags & IORESOURCE_MEM_EXPANSIONROM)
	pnp_printf(buffer, ", expansion ROM");
	switch (mem->flags & IORESOURCE_MEM_TYPE_MASK) {
	case IORESOURCE_MEM_8BIT:
	s = "8-bit";
	break;
	case IORESOURCE_MEM_8AND16BIT:
	s = "8-bit&16-bit";
	break;
	case IORESOURCE_MEM_32BIT:
	s = "32-bit";
	break;
	default:
	s = "16-bit";
	}
	pnp_printf(buffer, ", %s\n", s);
	}

	static void pnp_print_option(pnp_info_buffer_t * buffer, char *space,
	struct pnp_option *option)
	{
	switch (option->type) {
	case IORESOURCE_IO:
	pnp_print_port(buffer, space, &option->u.port);
	break;
	case IORESOURCE_MEM:
	pnp_print_mem(buffer, space, &option->u.mem);
	break;
	case IORESOURCE_IRQ:
	pnp_print_irq(buffer, space, &option->u.irq);
	break;
	case IORESOURCE_DMA:
	pnp_print_dma(buffer, space, &option->u.dma);
	break;
	}
	}

	static ssize_t options_show(struct device dmdev, struct device_attribute attr,
	char *buf)
	{
	struct pnp_dev *dev = to_pnp_dev(dmdev);
	pnp_info_buffer_t *buffer;
	struct pnp_option *option;
	int ret, dep = 0, set = 0;
	char *indent;

	buffer = pnp_alloc(sizeof(pnp_info_buffer_t));
	if (!buffer)
	return -ENOMEM;

	buffer->len = PAGE_SIZE;
	buffer->buffer = buf;
	buffer->curr = buffer->buffer;

	list_for_each_entry(option, &dev->options, list) {
	if (pnp_option_is_dependent(option)) {
	indent = " ";
	if (!dep \|\| pnp_option_set(option) != set) {
	set = pnp_option_set(option);
	dep = 1;
	pnp_printf(buffer, "Dependent: %02i - "
	"Priority %s\n", set,
	pnp_option_priority_name(option));
	}
	} else {
	dep = 0;
	indent = "";
	}
	pnp_print_option(buffer, indent, option);
	}

	ret = (buffer->curr - buf);
	kfree(buffer);
	return ret;
	}
	static DEVICE_ATTR_RO(options);

	static ssize_t resources_show(struct device *dmdev,
	struct device_attribute attr, char buf)
	{
	struct pnp_dev *dev = to_pnp_dev(dmdev);
	pnp_info_buffer_t *buffer;
	struct pnp_resource *pnp_res;
	struct resource *res;
	int ret;

	if (!dev)
	return -EINVAL;

	buffer = pnp_alloc(sizeof(pnp_info_buffer_t));
	if (!buffer)
	return -ENOMEM;

	buffer->len = PAGE_SIZE;
	buffer->buffer = buf;
	buffer->curr = buffer->buffer;

	pnp_printf(buffer, "state = %s\n", dev->active ? "active" : "disabled");

	list_for_each_entry(pnp_res, &dev->resources, list) {
	res = &pnp_res->res;

	pnp_printf(buffer, pnp_resource_type_name(res));

	if (res->flags & IORESOURCE_DISABLED) {
	pnp_printf(buffer, " disabled\n");
	continue;
	}

	switch (pnp_resource_type(res)) {
	case IORESOURCE_IO:
	case IORESOURCE_MEM:
	case IORESOURCE_BUS:
	pnp_printf(buffer, " %#llx-%#llx%s\n",
	(unsigned long long) res->start,
	(unsigned long long) res->end,
	res->flags & IORESOURCE_WINDOW ?
	" window" : "");
	break;
	case IORESOURCE_IRQ:
	case IORESOURCE_DMA:
	pnp_printf(buffer, " %lld\n",
	(unsigned long long) res->start);
	break;
	}
	}

	ret = (buffer->curr - buf);
	kfree(buffer);
	return ret;
	}

	static char pnp_get_resource_value(char buf,
	unsigned long type,
	resource_size_t *start,
	resource_size_t *end,
	unsigned long *flags)
	{
	if (start)
	*start = 0;
	if (end)
	*end = 0;
	if (flags)
	*flags = 0;

	/* TBD: allow for disabled resources */

	buf = skip_spaces(buf);
	if (start) {
	*start = simple_strtoull(buf, &buf, 0);
	if (end) {
	buf = skip_spaces(buf);
	if (*buf == '-') {
	buf = skip_spaces(buf + 1);
	*end = simple_strtoull(buf, &buf, 0);
	} else
	end = start;
	}
	}

	/* TBD: allow for additional flags, e.g., IORESOURCE_WINDOW */

	return buf;
	}

	static ssize_t resources_store(struct device *dmdev,
	struct device_attribute attr, const char ubuf,
	size_t count)
	{
	struct pnp_dev *dev = to_pnp_dev(dmdev);
	char buf = (void )ubuf;
	int retval = 0;

	if (dev->status & PNP_ATTACHED) {
	retval = -EBUSY;
	dev_info(&dev->dev, "in use; can't configure\n");
	goto done;
	}

	buf = skip_spaces(buf);
	if (!strncasecmp(buf, "disable", 7)) {
	retval = pnp_disable_dev(dev);
	goto done;
	}
	if (!strncasecmp(buf, "activate", 8)) {
	retval = pnp_activate_dev(dev);
	goto done;
	}
	if (!strncasecmp(buf, "fill", 4)) {
	if (dev->active)
	goto done;
	retval = pnp_auto_config_dev(dev);
	goto done;
	}
	if (!strncasecmp(buf, "auto", 4)) {
	if (dev->active)
	goto done;
	pnp_init_resources(dev);
	retval = pnp_auto_config_dev(dev);
	goto done;
	}
	if (!strncasecmp(buf, "clear", 5)) {
	if (dev->active)
	goto done;
	pnp_init_resources(dev);
	goto done;
	}
	if (!strncasecmp(buf, "get", 3)) {
	mutex_lock(&pnp_res_mutex);
	if (pnp_can_read(dev))
	dev->protocol->get(dev);
	mutex_unlock(&pnp_res_mutex);
	goto done;
	}
	if (!strncasecmp(buf, "set", 3)) {
	resource_size_t start;
	resource_size_t end;
	unsigned long flags;

	if (dev->active)
	goto done;
	buf += 3;
	pnp_init_resources(dev);
	mutex_lock(&pnp_res_mutex);
	while (1) {
	buf = skip_spaces(buf);
	if (!strncasecmp(buf, "io", 2)) {
	buf = pnp_get_resource_value(buf + 2,
	IORESOURCE_IO,
	&start, &end,
	&flags);
	pnp_add_io_resource(dev, start, end, flags);
	} else if (!strncasecmp(buf, "mem", 3)) {
	buf = pnp_get_resource_value(buf + 3,
	IORESOURCE_MEM,
	&start, &end,
	&flags);
	pnp_add_mem_resource(dev, start, end, flags);
	} else if (!strncasecmp(buf, "irq", 3)) {
	buf = pnp_get_resource_value(buf + 3,
	IORESOURCE_IRQ,
	&start, NULL,
	&flags);
	pnp_add_irq_resource(dev, start, flags);
	} else if (!strncasecmp(buf, "dma", 3)) {
	buf = pnp_get_resource_value(buf + 3,
	IORESOURCE_DMA,
	&start, NULL,
	&flags);
	pnp_add_dma_resource(dev, start, flags);
	} else if (!strncasecmp(buf, "bus", 3)) {
	buf = pnp_get_resource_value(buf + 3,
	IORESOURCE_BUS,
	&start, &end,
	NULL);
	pnp_add_bus_resource(dev, start, end);
	} else
	break;
	}
	mutex_unlock(&pnp_res_mutex);
	goto done;
	}

	done:
	if (retval < 0)
	return retval;
	return count;
	}
	static DEVICE_ATTR_RW(resources);

	static ssize_t id_show(struct device dmdev, struct device_attribute attr,
	char *buf)
	{
	char *str = buf;
	struct pnp_dev *dev = to_pnp_dev(dmdev);
	struct pnp_id *pos = dev->id;

	while (pos) {
	str += sprintf(str, "%s\n", pos->id);
	pos = pos->next;
	}
	return (str - buf);
	}
	static DEVICE_ATTR_RO(id);

	static struct attribute *pnp_dev_attrs[] = {
	&dev_attr_resources.attr,
	&dev_attr_options.attr,
	&dev_attr_id.attr,
	NULL,
	};

	static const struct attribute_group pnp_dev_group = {
	.attrs = pnp_dev_attrs,
	};

	const struct attribute_group *pnp_dev_groups[] = {
	&pnp_dev_group,
	NULL,
	};