[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pnp / manager.c

/*
 * 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 <linux/mutex.h>
#include "base.h"

DEFINE_MUTEX(pnp_res_mutex);

static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
{
	struct resource *res, local_res;

	res = pnp_get_resource(dev, IORESOURCE_IO, idx);
	if (res) {
		dev_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
			"flags %#lx\n", idx, (unsigned long long) res->start,
			(unsigned long long) res->end, res->flags);
		return 1;
	}

	res = &local_res;
	res->flags = rule->flags | IORESOURCE_AUTO;
	res->start = 0;
	res->end = 0;

	if (!rule->size) {
		res->flags |= IORESOURCE_DISABLED;
		dev_dbg(&dev->dev, "  io %d disabled\n", idx);
		goto __add;
	}

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

	while (!pnp_check_port(dev, res)) {
		res->start += rule->align;
		res->end = res->start + rule->size - 1;
		if (res->start > rule->max || !rule->align) {
			dev_dbg(&dev->dev, "  couldn't assign io %d "
				"(min %#llx max %#llx)\n", idx,
				(unsigned long long) rule->min,
				(unsigned long long) rule->max);
			return 0;
		}
	}

__add:
	pnp_add_io_resource(dev, res->start, res->end, res->flags);
	return 1;
}

static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
{
	struct resource *res, local_res;

	res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
	if (res) {
		dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
			"flags %#lx\n", idx, (unsigned long long) res->start,
			(unsigned long long) res->end, res->flags);
		return 1;
	}

	res = &local_res;
	res->flags = rule->flags | IORESOURCE_AUTO;
	res->start = 0;
	res->end = 0;

	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
		res->flags |= IORESOURCE_READONLY;
	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
		res->flags |= IORESOURCE_CACHEABLE;
	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
		res->flags |= IORESOURCE_RANGELENGTH;
	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
		res->flags |= IORESOURCE_SHADOWABLE;

	if (!rule->size) {
		res->flags |= IORESOURCE_DISABLED;
		dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
		goto __add;
	}

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

	while (!pnp_check_mem(dev, res)) {
		res->start += rule->align;
		res->end = res->start + rule->size - 1;
		if (res->start > rule->max || !rule->align) {
			dev_dbg(&dev->dev, "  couldn't assign mem %d "
				"(min %#llx max %#llx)\n", idx,
				(unsigned long long) rule->min,
				(unsigned long long) rule->max);
			return 0;
		}
	}

__add:
	pnp_add_mem_resource(dev, res->start, res->end, res->flags);
	return 1;
}

static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
{
	struct resource *res, local_res;
	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
	};

	res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
	if (res) {
		dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
			idx, (int) res->start, res->flags);
		return 1;
	}

	res = &local_res;
	res->flags = rule->flags | IORESOURCE_AUTO;
	res->start = -1;
	res->end = -1;

	if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
		res->flags |= IORESOURCE_DISABLED;
		dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
		goto __add;
	}

	/* TBD: need check for >16 IRQ */
	res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
	if (res->start < PNP_IRQ_NR) {
		res->end = res->start;
		goto __add;
	}
	for (i = 0; i < 16; i++) {
		if (test_bit(xtab[i], rule->map.bits)) {
			res->start = res->end = xtab[i];
			if (pnp_check_irq(dev, res))
				goto __add;
		}
	}
	dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
	return 0;

__add:
	pnp_add_irq_resource(dev, res->start, res->flags);
	return 1;
}

static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
{
	struct resource *res, local_res;
	int i;

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

	res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
	if (res) {
		dev_dbg(&dev->dev, "  dma %d already set to %d flags %#lx\n",
			idx, (int) res->start, res->flags);
		return;
	}

	res = &local_res;
	res->flags = rule->flags | IORESOURCE_AUTO;
	res->start = -1;
	res->end = -1;

	for (i = 0; i < 8; i++) {
		if (rule->map & (1 << xtab[i])) {
			res->start = res->end = xtab[i];
			if (pnp_check_dma(dev, res))
				goto __add;
		}
	}
#ifdef MAX_DMA_CHANNELS
	res->start = res->end = MAX_DMA_CHANNELS;
#endif
	res->flags |= IORESOURCE_DISABLED;
	dev_dbg(&dev->dev, "  disable dma %d\n", idx);

__add:
	pnp_add_dma_resource(dev, res->start, res->flags);
}

void pnp_init_resources(struct pnp_dev *dev)
{
	pnp_free_resources(dev);
}

static void pnp_clean_resource_table(struct pnp_dev *dev)
{
	struct pnp_resource *pnp_res, *tmp;

	list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
		if (pnp_res->res.flags & IORESOURCE_AUTO)
			pnp_free_resource(pnp_res);
	}
}

/**
 * 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;

	dbg_pnp_show_resources(dev, "before pnp_assign_resources");
	mutex_lock(&pnp_res_mutex);
	pnp_clean_resource_table(dev);
	if (dev->independent) {
		dev_dbg(&dev->dev, "assigning independent options\n");
		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) {
			pnp_assign_dma(dev, dma, ndma);
			ndma++;
			dma = dma->next;
		}
	}

	if (depnum) {
		struct pnp_option *dep;
		int i;

		dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
		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) {
			pnp_assign_dma(dev, dma, ndma);
			ndma++;
			dma = dma->next;
		}
	} else if (dev->dependent)
		goto fail;

	mutex_unlock(&pnp_res_mutex);
	dbg_pnp_show_resources(dev, "after pnp_assign_resources");
	return 1;

fail:
	pnp_clean_resource_table(dev);
	mutex_unlock(&pnp_res_mutex);
	dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
	return 0;
}

/**
 * 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)) {
		dev_dbg(&dev->dev, "configuration not supported\n");
		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);
	}

	dev_err(&dev->dev, "unable to assign resources\n");
	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)) {
		dev_dbg(&dev->dev, "activation not supported\n");
		return -EINVAL;
	}

	dbg_pnp_show_resources(dev, "pnp_start_dev");
	if (dev->protocol->set(dev) < 0) {
		dev_err(&dev->dev, "activation failed\n");
		return -EIO;
	}

	dev_info(&dev->dev, "activated\n");
	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)) {
		dev_dbg(&dev->dev, "disabling not supported\n");
		return -EINVAL;
	}
	if (dev->protocol->disable(dev) < 0) {
		dev_err(&dev->dev, "disable failed\n");
		return -EIO;
	}

	dev_info(&dev->dev, "disabled\n");
	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;

	/* 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 0;
}

/**
 * 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;

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

	dev->active = 0;

	/* release the resources so that other devices can use them */
	mutex_lock(&pnp_res_mutex);
	pnp_clean_resource_table(dev);
	mutex_unlock(&pnp_res_mutex);

	return 0;
}

EXPORT_SYMBOL(pnp_start_dev);
EXPORT_SYMBOL(pnp_stop_dev);
EXPORT_SYMBOL(pnp_activate_dev);
EXPORT_SYMBOL(pnp_disable_dev);
Commit	Line	Data
	1	/*
	2	* manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
	3	*
	4	* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
	5	* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
	6	*/
	7
	8	#include <linux/errno.h>
	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11	#include <linux/kernel.h>
	12	#include <linux/pnp.h>
	13	#include <linux/slab.h>
	14	#include <linux/bitmap.h>
	15	#include <linux/mutex.h>
	16	#include "base.h"
	17
	18	DEFINE_MUTEX(pnp_res_mutex);
	19
	20	static int pnp_assign_port(struct pnp_dev dev, struct pnp_port rule, int idx)
	21	{
	22	struct resource *res, local_res;
	23
	24	res = pnp_get_resource(dev, IORESOURCE_IO, idx);
	25	if (res) {
	26	dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
	27	"flags %#lx\n", idx, (unsigned long long) res->start,
	28	(unsigned long long) res->end, res->flags);
	29	return 1;
	30	}
	31
	32	res = &local_res;
	33	res->flags = rule->flags \| IORESOURCE_AUTO;
	34	res->start = 0;
	35	res->end = 0;
	36
	37	if (!rule->size) {
	38	res->flags \|= IORESOURCE_DISABLED;
	39	dev_dbg(&dev->dev, " io %d disabled\n", idx);
	40	goto __add;
	41	}
	42
	43	res->start = rule->min;
	44	res->end = res->start + rule->size - 1;
	45
	46	while (!pnp_check_port(dev, res)) {
	47	res->start += rule->align;
	48	res->end = res->start + rule->size - 1;
	49	if (res->start > rule->max \|\| !rule->align) {
	50	dev_dbg(&dev->dev, " couldn't assign io %d "
	51	"(min %#llx max %#llx)\n", idx,
	52	(unsigned long long) rule->min,
	53	(unsigned long long) rule->max);
	54	return 0;
	55	}
	56	}
	57
	58	__add:
	59	pnp_add_io_resource(dev, res->start, res->end, res->flags);
	60	return 1;
	61	}
	62
	63	static int pnp_assign_mem(struct pnp_dev dev, struct pnp_mem rule, int idx)
	64	{
	65	struct resource *res, local_res;
	66
	67	res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
	68	if (res) {
	69	dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
	70	"flags %#lx\n", idx, (unsigned long long) res->start,
	71	(unsigned long long) res->end, res->flags);
	72	return 1;
	73	}
	74
	75	res = &local_res;
	76	res->flags = rule->flags \| IORESOURCE_AUTO;
	77	res->start = 0;
	78	res->end = 0;
	79
	80	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
	81	res->flags \|= IORESOURCE_READONLY;
	82	if (rule->flags & IORESOURCE_MEM_CACHEABLE)
	83	res->flags \|= IORESOURCE_CACHEABLE;
	84	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
	85	res->flags \|= IORESOURCE_RANGELENGTH;
	86	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
	87	res->flags \|= IORESOURCE_SHADOWABLE;
	88
	89	if (!rule->size) {
	90	res->flags \|= IORESOURCE_DISABLED;
	91	dev_dbg(&dev->dev, " mem %d disabled\n", idx);
	92	goto __add;
	93	}
	94
	95	res->start = rule->min;
	96	res->end = res->start + rule->size - 1;
	97
	98	while (!pnp_check_mem(dev, res)) {
	99	res->start += rule->align;
	100	res->end = res->start + rule->size - 1;
	101	if (res->start > rule->max \|\| !rule->align) {
	102	dev_dbg(&dev->dev, " couldn't assign mem %d "
	103	"(min %#llx max %#llx)\n", idx,
	104	(unsigned long long) rule->min,
	105	(unsigned long long) rule->max);
	106	return 0;
	107	}
	108	}
	109
	110	__add:
	111	pnp_add_mem_resource(dev, res->start, res->end, res->flags);
	112	return 1;
	113	}
	114
	115	static int pnp_assign_irq(struct pnp_dev dev, struct pnp_irq rule, int idx)
	116	{
	117	struct resource *res, local_res;
	118	int i;
	119
	120	/* IRQ priority: this table is good for i386 */
	121	static unsigned short xtab[16] = {
	122	5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
	123	};
	124
	125	res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
	126	if (res) {
	127	dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
	128	idx, (int) res->start, res->flags);
	129	return 1;
	130	}
	131
	132	res = &local_res;
	133	res->flags = rule->flags \| IORESOURCE_AUTO;
	134	res->start = -1;
	135	res->end = -1;
	136
	137	if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
	138	res->flags \|= IORESOURCE_DISABLED;
	139	dev_dbg(&dev->dev, " irq %d disabled\n", idx);
	140	goto __add;
	141	}
	142
	143	/* TBD: need check for >16 IRQ */
	144	res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
	145	if (res->start < PNP_IRQ_NR) {
	146	res->end = res->start;
	147	goto __add;
	148	}
	149	for (i = 0; i < 16; i++) {
	150	if (test_bit(xtab[i], rule->map.bits)) {
	151	res->start = res->end = xtab[i];
	152	if (pnp_check_irq(dev, res))
	153	goto __add;
	154	}
	155	}
	156	dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
	157	return 0;
	158
	159	__add:
	160	pnp_add_irq_resource(dev, res->start, res->flags);
	161	return 1;
	162	}
	163
	164	static void pnp_assign_dma(struct pnp_dev dev, struct pnp_dma rule, int idx)
	165	{
	166	struct resource *res, local_res;
	167	int i;
	168
	169	/* DMA priority: this table is good for i386 */
	170	static unsigned short xtab[8] = {
	171	1, 3, 5, 6, 7, 0, 2, 4
	172	};
	173
	174	res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
	175	if (res) {
	176	dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
	177	idx, (int) res->start, res->flags);
	178	return;
	179	}
	180
	181	res = &local_res;
	182	res->flags = rule->flags \| IORESOURCE_AUTO;
	183	res->start = -1;
	184	res->end = -1;
	185
	186	for (i = 0; i < 8; i++) {
	187	if (rule->map & (1 << xtab[i])) {
	188	res->start = res->end = xtab[i];
	189	if (pnp_check_dma(dev, res))
	190	goto __add;
	191	}
	192	}
	193	#ifdef MAX_DMA_CHANNELS
	194	res->start = res->end = MAX_DMA_CHANNELS;
	195	#endif
	196	res->flags \|= IORESOURCE_DISABLED;
	197	dev_dbg(&dev->dev, " disable dma %d\n", idx);
	198
	199	__add:
	200	pnp_add_dma_resource(dev, res->start, res->flags);
	201	}
	202
	203	void pnp_init_resources(struct pnp_dev *dev)
	204	{
	205	pnp_free_resources(dev);
	206	}
	207
	208	static void pnp_clean_resource_table(struct pnp_dev *dev)
	209	{
	210	struct pnp_resource pnp_res, tmp;
	211
	212	list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
	213	if (pnp_res->res.flags & IORESOURCE_AUTO)
	214	pnp_free_resource(pnp_res);
	215	}
	216	}
	217
	218	/**
	219	* pnp_assign_resources - assigns resources to the device based on the specified dependent number
	220	* @dev: pointer to the desired device
	221	* @depnum: the dependent function number
	222	*
	223	* Only set depnum to 0 if the device does not have dependent options.
	224	*/
	225	static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
	226	{
	227	struct pnp_port *port;
	228	struct pnp_mem *mem;
	229	struct pnp_irq *irq;
	230	struct pnp_dma *dma;
	231	int nport = 0, nmem = 0, nirq = 0, ndma = 0;
	232
	233	if (!pnp_can_configure(dev))
	234	return -ENODEV;
	235
	236	dbg_pnp_show_resources(dev, "before pnp_assign_resources");
	237	mutex_lock(&pnp_res_mutex);
	238	pnp_clean_resource_table(dev);
	239	if (dev->independent) {
	240	dev_dbg(&dev->dev, "assigning independent options\n");
	241	port = dev->independent->port;
	242	mem = dev->independent->mem;
	243	irq = dev->independent->irq;
	244	dma = dev->independent->dma;
	245	while (port) {
	246	if (!pnp_assign_port(dev, port, nport))
	247	goto fail;
	248	nport++;
	249	port = port->next;
	250	}
	251	while (mem) {
	252	if (!pnp_assign_mem(dev, mem, nmem))
	253	goto fail;
	254	nmem++;
	255	mem = mem->next;
	256	}
	257	while (irq) {
	258	if (!pnp_assign_irq(dev, irq, nirq))
	259	goto fail;
	260	nirq++;
	261	irq = irq->next;
	262	}
	263	while (dma) {
	264	pnp_assign_dma(dev, dma, ndma);
	265	ndma++;
	266	dma = dma->next;
	267	}
	268	}
	269
	270	if (depnum) {
	271	struct pnp_option *dep;
	272	int i;
	273
	274	dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
	275	for (i = 1, dep = dev->dependent; i < depnum;
	276	i++, dep = dep->next)
	277	if (!dep)
	278	goto fail;
	279	port = dep->port;
	280	mem = dep->mem;
	281	irq = dep->irq;
	282	dma = dep->dma;
	283	while (port) {
	284	if (!pnp_assign_port(dev, port, nport))
	285	goto fail;
	286	nport++;
	287	port = port->next;
	288	}
	289	while (mem) {
	290	if (!pnp_assign_mem(dev, mem, nmem))
	291	goto fail;
	292	nmem++;
	293	mem = mem->next;
	294	}
	295	while (irq) {
	296	if (!pnp_assign_irq(dev, irq, nirq))
	297	goto fail;
	298	nirq++;
	299	irq = irq->next;
	300	}
	301	while (dma) {
	302	pnp_assign_dma(dev, dma, ndma);
	303	ndma++;
	304	dma = dma->next;
	305	}
	306	} else if (dev->dependent)
	307	goto fail;
	308
	309	mutex_unlock(&pnp_res_mutex);
	310	dbg_pnp_show_resources(dev, "after pnp_assign_resources");
	311	return 1;
	312
	313	fail:
	314	pnp_clean_resource_table(dev);
	315	mutex_unlock(&pnp_res_mutex);
	316	dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
	317	return 0;
	318	}
	319
	320	/**
	321	* pnp_auto_config_dev - automatically assigns resources to a device
	322	* @dev: pointer to the desired device
	323	*/
	324	int pnp_auto_config_dev(struct pnp_dev *dev)
	325	{
	326	struct pnp_option *dep;
	327	int i = 1;
	328
	329	if (!pnp_can_configure(dev)) {
	330	dev_dbg(&dev->dev, "configuration not supported\n");
	331	return -ENODEV;
	332	}
	333
	334	if (!dev->dependent) {
	335	if (pnp_assign_resources(dev, 0))
	336	return 0;
	337	} else {
	338	dep = dev->dependent;
	339	do {
	340	if (pnp_assign_resources(dev, i))
	341	return 0;
	342	dep = dep->next;
	343	i++;
	344	} while (dep);
	345	}
	346
	347	dev_err(&dev->dev, "unable to assign resources\n");
	348	return -EBUSY;
	349	}
	350
	351	/**
	352	* pnp_start_dev - low-level start of the PnP device
	353	* @dev: pointer to the desired device
	354	*
	355	* assumes that resources have already been allocated
	356	*/
	357	int pnp_start_dev(struct pnp_dev *dev)
	358	{
	359	if (!pnp_can_write(dev)) {
	360	dev_dbg(&dev->dev, "activation not supported\n");
	361	return -EINVAL;
	362	}
	363
	364	dbg_pnp_show_resources(dev, "pnp_start_dev");
	365	if (dev->protocol->set(dev) < 0) {
	366	dev_err(&dev->dev, "activation failed\n");
	367	return -EIO;
	368	}
	369
	370	dev_info(&dev->dev, "activated\n");
	371	return 0;
	372	}
	373
	374	/**
	375	* pnp_stop_dev - low-level disable of the PnP device
	376	* @dev: pointer to the desired device
	377	*
	378	* does not free resources
	379	*/
	380	int pnp_stop_dev(struct pnp_dev *dev)
	381	{
	382	if (!pnp_can_disable(dev)) {
	383	dev_dbg(&dev->dev, "disabling not supported\n");
	384	return -EINVAL;
	385	}
	386	if (dev->protocol->disable(dev) < 0) {
	387	dev_err(&dev->dev, "disable failed\n");
	388	return -EIO;
	389	}
	390
	391	dev_info(&dev->dev, "disabled\n");
	392	return 0;
	393	}
	394
	395	/**
	396	* pnp_activate_dev - activates a PnP device for use
	397	* @dev: pointer to the desired device
	398	*
	399	* does not validate or set resources so be careful.
	400	*/
	401	int pnp_activate_dev(struct pnp_dev *dev)
	402	{
	403	int error;
	404
	405	if (dev->active)
	406	return 0;
	407
	408	/* ensure resources are allocated */
	409	if (pnp_auto_config_dev(dev))
	410	return -EBUSY;
	411
	412	error = pnp_start_dev(dev);
	413	if (error)
	414	return error;
	415
	416	dev->active = 1;
	417	return 0;
	418	}
	419
	420	/**
	421	* pnp_disable_dev - disables device
	422	* @dev: pointer to the desired device
	423	*
	424	* inform the correct pnp protocol so that resources can be used by other devices
	425	*/
	426	int pnp_disable_dev(struct pnp_dev *dev)
	427	{
	428	int error;
	429
	430	if (!dev->active)
	431	return 0;
	432
	433	error = pnp_stop_dev(dev);
	434	if (error)
	435	return error;
	436
	437	dev->active = 0;
	438
	439	/* release the resources so that other devices can use them */
	440	mutex_lock(&pnp_res_mutex);
	441	pnp_clean_resource_table(dev);
	442	mutex_unlock(&pnp_res_mutex);
	443
	444	return 0;
	445	}
	446
	447	EXPORT_SYMBOL(pnp_start_dev);
	448	EXPORT_SYMBOL(pnp_stop_dev);
	449	EXPORT_SYMBOL(pnp_activate_dev);
	450	EXPORT_SYMBOL(pnp_disable_dev);