[linux-2.6-block.git] / drivers / pnp / driver.c

/*
 * driver.c - device id matching, driver model, etc.
 *
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/string.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/pnp.h>
#include "base.h"

static int compare_func(const char *ida, const char *idb)
{
	int i;

	/* we only need to compare the last 4 chars */
	for (i = 3; i < 7; i++) {
		if (ida[i] != 'X' &&
		    idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
			return 0;
	}
	return 1;
}

int compare_pnp_id(struct pnp_id *pos, const char *id)
{
	if (!pos || !id || (strlen(id) != 7))
		return 0;
	if (memcmp(id, "ANYDEVS", 7) == 0)
		return 1;
	while (pos) {
		if (memcmp(pos->id, id, 3) == 0)
			if (compare_func(pos->id, id) == 1)
				return 1;
		pos = pos->next;
	}
	return 0;
}

static const struct pnp_device_id *match_device(struct pnp_driver *drv,
						struct pnp_dev *dev)
{
	const struct pnp_device_id *drv_id = drv->id_table;

	if (!drv_id)
		return NULL;

	while (*drv_id->id) {
		if (compare_pnp_id(dev->id, drv_id->id))
			return drv_id;
		drv_id++;
	}
	return NULL;
}

int pnp_device_attach(struct pnp_dev *pnp_dev)
{
	spin_lock(&pnp_lock);
	if (pnp_dev->status != PNP_READY) {
		spin_unlock(&pnp_lock);
		return -EBUSY;
	}
	pnp_dev->status = PNP_ATTACHED;
	spin_unlock(&pnp_lock);
	return 0;
}

void pnp_device_detach(struct pnp_dev *pnp_dev)
{
	spin_lock(&pnp_lock);
	if (pnp_dev->status == PNP_ATTACHED)
		pnp_dev->status = PNP_READY;
	spin_unlock(&pnp_lock);
	pnp_disable_dev(pnp_dev);
}

static int pnp_device_probe(struct device *dev)
{
	int error;
	struct pnp_driver *pnp_drv;
	struct pnp_dev *pnp_dev;
	const struct pnp_device_id *dev_id = NULL;
	pnp_dev = to_pnp_dev(dev);
	pnp_drv = to_pnp_driver(dev->driver);

	pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
		dev->bus_id, pnp_drv->name);

	error = pnp_device_attach(pnp_dev);
	if (error < 0)
		return error;

	if (pnp_dev->active == 0) {
		if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
			error = pnp_activate_dev(pnp_dev);
			if (error < 0)
				return error;
		}
	} else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
		   == PNP_DRIVER_RES_DISABLE) {
		error = pnp_disable_dev(pnp_dev);
		if (error < 0)
			return error;
	}
	error = 0;
	if (pnp_drv->probe) {
		dev_id = match_device(pnp_drv, pnp_dev);
		if (dev_id != NULL)
			error = pnp_drv->probe(pnp_dev, dev_id);
	}
	if (error >= 0) {
		pnp_dev->driver = pnp_drv;
		error = 0;
	} else
		goto fail;
	return error;

fail:
	pnp_device_detach(pnp_dev);
	return error;
}

static int pnp_device_remove(struct device *dev)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *drv = pnp_dev->driver;

	if (drv) {
		if (drv->remove)
			drv->remove(pnp_dev);
		pnp_dev->driver = NULL;
	}
	pnp_device_detach(pnp_dev);
	return 0;
}

static int pnp_bus_match(struct device *dev, struct device_driver *drv)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *pnp_drv = to_pnp_driver(drv);

	if (match_device(pnp_drv, pnp_dev) == NULL)
		return 0;
	return 1;
}

static int pnp_bus_suspend(struct device *dev, pm_message_t state)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *pnp_drv = pnp_dev->driver;
	int error;

	if (!pnp_drv)
		return 0;

	if (pnp_drv->suspend) {
		error = pnp_drv->suspend(pnp_dev, state);
		if (error)
			return error;
	}

	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
	    pnp_can_disable(pnp_dev)) {
		error = pnp_stop_dev(pnp_dev);
		if (error)
			return error;
	}

	if (pnp_dev->protocol && pnp_dev->protocol->suspend)
		pnp_dev->protocol->suspend(pnp_dev, state);
	return 0;
}

static int pnp_bus_resume(struct device *dev)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *pnp_drv = pnp_dev->driver;
	int error;

	if (!pnp_drv)
		return 0;

	if (pnp_dev->protocol && pnp_dev->protocol->resume)
		pnp_dev->protocol->resume(pnp_dev);

	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
		error = pnp_start_dev(pnp_dev);
		if (error)
			return error;
	}

	if (pnp_drv->resume)
		return pnp_drv->resume(pnp_dev);

	return 0;
}

struct bus_type pnp_bus_type = {
	.name    = "pnp",
	.match   = pnp_bus_match,
	.probe   = pnp_device_probe,
	.remove  = pnp_device_remove,
	.suspend = pnp_bus_suspend,
	.resume  = pnp_bus_resume,
};

int pnp_register_driver(struct pnp_driver *drv)
{
	pnp_dbg("the driver '%s' has been registered", drv->name);

	drv->driver.name = drv->name;
	drv->driver.bus = &pnp_bus_type;

	return driver_register(&drv->driver);
}

void pnp_unregister_driver(struct pnp_driver *drv)
{
	driver_unregister(&drv->driver);
	pnp_dbg("the driver '%s' has been unregistered", drv->name);
}

/**
 * pnp_add_id - adds an EISA id to the specified device
 * @id: pointer to a pnp_id structure
 * @dev: pointer to the desired device
 */
int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
{
	struct pnp_id *ptr;

	id->next = NULL;
	ptr = dev->id;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = id;
	else
		dev->id = id;
	return 0;
}

EXPORT_SYMBOL(pnp_register_driver);
EXPORT_SYMBOL(pnp_unregister_driver);
EXPORT_SYMBOL(pnp_device_attach);
EXPORT_SYMBOL(pnp_device_detach);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* driver.c - device id matching, driver model, etc.
	3	*
	4	* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
1da177e4 LT	5	*/
1da177e4 LT	6
1da177e4 LT	7	#include <linux/string.h>
	8	#include <linux/list.h>
	9	#include <linux/module.h>
	10	#include <linux/ctype.h>
	11	#include <linux/slab.h>
1da177e4 LT	12	#include <linux/pnp.h>
	13	#include "base.h"
	14
	15	static int compare_func(const char ida, const char idb)
	16	{
	17	int i;
07d4e9af	18
1da177e4	19	/* we only need to compare the last 4 chars */
9dd78466	20	for (i = 3; i < 7; i++) {
1da177e4	21	if (ida[i] != 'X' &&
9dd78466	22	idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
1da177e4 LT	23	return 0;
	24	}
	25	return 1;
	26	}
	27
	28	int compare_pnp_id(struct pnp_id pos, const char id)
	29	{
	30	if (!pos \|\| !id \|\| (strlen(id) != 7))
	31	return 0;
9dd78466	32	if (memcmp(id, "ANYDEVS", 7) == 0)
1da177e4	33	return 1;
9dd78466 BH	34	while (pos) {
	35	if (memcmp(pos->id, id, 3) == 0)
	36	if (compare_func(pos->id, id) == 1)
1da177e4 LT	37	return 1;
	38	pos = pos->next;
	39	}
	40	return 0;
	41	}
	42
9dd78466 BH	43	static const struct pnp_device_id match_device(struct pnp_driver drv,
9dd78466 BH	44	struct pnp_dev *dev)
1da177e4 LT	45	{
1da177e4 LT	46	const struct pnp_device_id *drv_id = drv->id_table;
07d4e9af	47
1da177e4 LT	48	if (!drv_id)
	49	return NULL;
	50
	51	while (*drv_id->id) {
	52	if (compare_pnp_id(dev->id, drv_id->id))
	53	return drv_id;
	54	drv_id++;
	55	}
	56	return NULL;
	57	}
	58
	59	int pnp_device_attach(struct pnp_dev *pnp_dev)
	60	{
	61	spin_lock(&pnp_lock);
9dd78466	62	if (pnp_dev->status != PNP_READY) {
1da177e4 LT	63	spin_unlock(&pnp_lock);
	64	return -EBUSY;
	65	}
	66	pnp_dev->status = PNP_ATTACHED;
	67	spin_unlock(&pnp_lock);
	68	return 0;
	69	}
	70
	71	void pnp_device_detach(struct pnp_dev *pnp_dev)
	72	{
	73	spin_lock(&pnp_lock);
	74	if (pnp_dev->status == PNP_ATTACHED)
	75	pnp_dev->status = PNP_READY;
	76	spin_unlock(&pnp_lock);
	77	pnp_disable_dev(pnp_dev);
	78	}
	79
	80	static int pnp_device_probe(struct device *dev)
	81	{
	82	int error;
	83	struct pnp_driver *pnp_drv;
	84	struct pnp_dev *pnp_dev;
	85	const struct pnp_device_id *dev_id = NULL;
	86	pnp_dev = to_pnp_dev(dev);
	87	pnp_drv = to_pnp_driver(dev->driver);
	88
9dd78466 BH	89	pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
9dd78466 BH	90	dev->bus_id, pnp_drv->name);
1da177e4 LT	91
	92	error = pnp_device_attach(pnp_dev);
	93	if (error < 0)
	94	return error;
	95
	96	if (pnp_dev->active == 0) {
	97	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
	98	error = pnp_activate_dev(pnp_dev);
	99	if (error < 0)
	100	return error;
	101	}
	102	} else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
9dd78466	103	== PNP_DRIVER_RES_DISABLE) {
1da177e4 LT	104	error = pnp_disable_dev(pnp_dev);
	105	if (error < 0)
	106	return error;
	107	}
	108	error = 0;
	109	if (pnp_drv->probe) {
	110	dev_id = match_device(pnp_drv, pnp_dev);
	111	if (dev_id != NULL)
	112	error = pnp_drv->probe(pnp_dev, dev_id);
	113	}
9dd78466	114	if (error >= 0) {
1da177e4 LT	115	pnp_dev->driver = pnp_drv;
	116	error = 0;
	117	} else
	118	goto fail;
	119	return error;
	120
1e0aa9ad	121	fail:
1da177e4 LT	122	pnp_device_detach(pnp_dev);
	123	return error;
	124	}
	125
	126	static int pnp_device_remove(struct device *dev)
	127	{
9dd78466 BH	128	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	129	struct pnp_driver *drv = pnp_dev->driver;
1da177e4 LT	130
	131	if (drv) {
	132	if (drv->remove)
	133	drv->remove(pnp_dev);
	134	pnp_dev->driver = NULL;
	135	}
	136	pnp_device_detach(pnp_dev);
	137	return 0;
	138	}
	139
	140	static int pnp_bus_match(struct device dev, struct device_driver drv)
	141	{
9dd78466 BH	142	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	143	struct pnp_driver *pnp_drv = to_pnp_driver(drv);
07d4e9af	144
1da177e4 LT	145	if (match_device(pnp_drv, pnp_dev) == NULL)
	146	return 0;
	147	return 1;
	148	}
	149
4c98cfef TI	150	static int pnp_bus_suspend(struct device *dev, pm_message_t state)
4c98cfef TI	151	{
9dd78466 BH	152	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	153	struct pnp_driver *pnp_drv = pnp_dev->driver;
68094e32 PO	154	int error;
	155
	156	if (!pnp_drv)
	157	return 0;
	158
	159	if (pnp_drv->suspend) {
	160	error = pnp_drv->suspend(pnp_dev, state);
	161	if (error)
	162	return error;
	163	}
	164
	165	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
	166	pnp_can_disable(pnp_dev)) {
9dd78466 BH	167	error = pnp_stop_dev(pnp_dev);
	168	if (error)
	169	return error;
68094e32	170	}
4c98cfef	171
fc30e68e SL	172	if (pnp_dev->protocol && pnp_dev->protocol->suspend)
fc30e68e SL	173	pnp_dev->protocol->suspend(pnp_dev, state);
4c98cfef TI	174	return 0;
	175	}
	176
68094e32	177	static int pnp_bus_resume(struct device *dev)
4c98cfef	178	{
9dd78466 BH	179	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	180	struct pnp_driver *pnp_drv = pnp_dev->driver;
68094e32 PO	181	int error;
	182
	183	if (!pnp_drv)
	184	return 0;
	185
fc30e68e SL	186	if (pnp_dev->protocol && pnp_dev->protocol->resume)
	187	pnp_dev->protocol->resume(pnp_dev);
	188
68094e32 PO	189	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
	190	error = pnp_start_dev(pnp_dev);
	191	if (error)
	192	return error;
	193	}
4c98cfef	194
68094e32 PO	195	if (pnp_drv->resume)
	196	return pnp_drv->resume(pnp_dev);
	197
	198	return 0;
4c98cfef	199	}
1da177e4 LT	200
1da177e4 LT	201	struct bus_type pnp_bus_type = {
07d4e9af BH	202	.name = "pnp",
	203	.match = pnp_bus_match,
	204	.probe = pnp_device_probe,
	205	.remove = pnp_device_remove,
4c98cfef	206	.suspend = pnp_bus_suspend,
07d4e9af	207	.resume = pnp_bus_resume,
1da177e4 LT	208	};
1da177e4 LT	209
1da177e4 LT	210	int pnp_register_driver(struct pnp_driver *drv)
1da177e4 LT	211	{
1da177e4 LT	212	pnp_dbg("the driver '%s' has been registered", drv->name);
	213
	214	drv->driver.name = drv->name;
	215	drv->driver.bus = &pnp_bus_type;
1da177e4	216
982c6094	217	return driver_register(&drv->driver);
1da177e4 LT	218	}
	219
	220	void pnp_unregister_driver(struct pnp_driver *drv)
	221	{
	222	driver_unregister(&drv->driver);
	223	pnp_dbg("the driver '%s' has been unregistered", drv->name);
	224	}
	225
	226	/**
	227	* pnp_add_id - adds an EISA id to the specified device
	228	* @id: pointer to a pnp_id structure
	229	* @dev: pointer to the desired device
1da177e4	230	*/
1da177e4 LT	231	int pnp_add_id(struct pnp_id id, struct pnp_dev dev)
	232	{
	233	struct pnp_id *ptr;
07d4e9af	234
1da177e4 LT	235	id->next = NULL;
	236	ptr = dev->id;
	237	while (ptr && ptr->next)
	238	ptr = ptr->next;
	239	if (ptr)
	240	ptr->next = id;
	241	else
	242	dev->id = id;
	243	return 0;
	244	}
	245
	246	EXPORT_SYMBOL(pnp_register_driver);
	247	EXPORT_SYMBOL(pnp_unregister_driver);
1da177e4 LT	248	EXPORT_SYMBOL(pnp_device_attach);
1da177e4 LT	249	EXPORT_SYMBOL(pnp_device_detach);