[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);

	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;

	dev_dbg(dev, "driver attached\n");
	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_can_disable(pnp_dev)) {
		error = pnp_stop_dev(pnp_dev);
		if (error)
			return error;
	}

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

	if (pnp_can_write(pnp_dev)) {
		error = pnp_start_dev(pnp_dev);
		if (error)
			return error;
	}

	if (pnp_drv->resume) {
		error = pnp_drv->resume(pnp_dev);
		if (error)
			return error;
	}

	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
 * @dev: pointer to the desired device
 * @id: pointer to an EISA id string
 */
struct pnp_id *pnp_add_id(struct pnp_dev *dev, char *id)
{
	struct pnp_id *dev_id, *ptr;

	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	if (!dev_id)
		return NULL;

	dev_id->id[0] = id[0];
	dev_id->id[1] = id[1];
	dev_id->id[2] = id[2];
	dev_id->id[3] = tolower(id[3]);
	dev_id->id[4] = tolower(id[4]);
	dev_id->id[5] = tolower(id[5]);
	dev_id->id[6] = tolower(id[6]);
	dev_id->id[7] = '\0';

	dev_id->next = NULL;
	ptr = dev->id;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = dev_id;
	else
		dev->id = dev_id;

	return dev_id;
}

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
1da177e4 LT	89	error = pnp_device_attach(pnp_dev);
	90	if (error < 0)
	91	return error;
	92
	93	if (pnp_dev->active == 0) {
	94	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
	95	error = pnp_activate_dev(pnp_dev);
	96	if (error < 0)
	97	return error;
	98	}
	99	} else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
9dd78466	100	== PNP_DRIVER_RES_DISABLE) {
1da177e4 LT	101	error = pnp_disable_dev(pnp_dev);
	102	if (error < 0)
	103	return error;
	104	}
	105	error = 0;
	106	if (pnp_drv->probe) {
	107	dev_id = match_device(pnp_drv, pnp_dev);
	108	if (dev_id != NULL)
	109	error = pnp_drv->probe(pnp_dev, dev_id);
	110	}
9dd78466	111	if (error >= 0) {
1da177e4 LT	112	pnp_dev->driver = pnp_drv;
	113	error = 0;
	114	} else
	115	goto fail;
a05d0781 BH	116
a05d0781 BH	117	dev_dbg(dev, "driver attached\n");
1da177e4 LT	118	return error;
1da177e4 LT	119
1e0aa9ad	120	fail:
1da177e4 LT	121	pnp_device_detach(pnp_dev);
	122	return error;
	123	}
	124
	125	static int pnp_device_remove(struct device *dev)
	126	{
9dd78466 BH	127	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	128	struct pnp_driver *drv = pnp_dev->driver;
1da177e4 LT	129
	130	if (drv) {
	131	if (drv->remove)
	132	drv->remove(pnp_dev);
	133	pnp_dev->driver = NULL;
	134	}
	135	pnp_device_detach(pnp_dev);
	136	return 0;
	137	}
	138
	139	static int pnp_bus_match(struct device dev, struct device_driver drv)
	140	{
9dd78466 BH	141	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	142	struct pnp_driver *pnp_drv = to_pnp_driver(drv);
07d4e9af	143
1da177e4 LT	144	if (match_device(pnp_drv, pnp_dev) == NULL)
	145	return 0;
	146	return 1;
	147	}
	148
4c98cfef TI	149	static int pnp_bus_suspend(struct device *dev, pm_message_t state)
4c98cfef TI	150	{
9dd78466 BH	151	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	152	struct pnp_driver *pnp_drv = pnp_dev->driver;
68094e32 PO	153	int error;
	154
	155	if (!pnp_drv)
	156	return 0;
	157
	158	if (pnp_drv->suspend) {
	159	error = pnp_drv->suspend(pnp_dev, state);
	160	if (error)
	161	return error;
	162	}
	163
5d38998e	164	if (pnp_can_disable(pnp_dev)) {
9dd78466 BH	165	error = pnp_stop_dev(pnp_dev);
	166	if (error)
	167	return error;
68094e32	168	}
4c98cfef	169
0bc11fd4	170	if (pnp_dev->protocol->suspend)
fc30e68e	171	pnp_dev->protocol->suspend(pnp_dev, state);
4c98cfef TI	172	return 0;
	173	}
	174
68094e32	175	static int pnp_bus_resume(struct device *dev)
4c98cfef	176	{
9dd78466 BH	177	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
9dd78466 BH	178	struct pnp_driver *pnp_drv = pnp_dev->driver;
68094e32 PO	179	int error;
	180
	181	if (!pnp_drv)
	182	return 0;
	183
0bc11fd4	184	if (pnp_dev->protocol->resume)
fc30e68e SL	185	pnp_dev->protocol->resume(pnp_dev);
fc30e68e SL	186
5d38998e	187	if (pnp_can_write(pnp_dev)) {
68094e32 PO	188	error = pnp_start_dev(pnp_dev);
	189	if (error)
	190	return error;
	191	}
4c98cfef	192
5d38998e RH	193	if (pnp_drv->resume) {
	194	error = pnp_drv->resume(pnp_dev);
	195	if (error)
	196	return error;
	197	}
68094e32 PO	198
68094e32 PO	199	return 0;
4c98cfef	200	}
1da177e4 LT	201
1da177e4 LT	202	struct bus_type pnp_bus_type = {
07d4e9af BH	203	.name = "pnp",
	204	.match = pnp_bus_match,
	205	.probe = pnp_device_probe,
	206	.remove = pnp_device_remove,
4c98cfef	207	.suspend = pnp_bus_suspend,
07d4e9af	208	.resume = pnp_bus_resume,
1da177e4 LT	209	};
1da177e4 LT	210
1da177e4 LT	211	int pnp_register_driver(struct pnp_driver *drv)
1da177e4 LT	212	{
1da177e4 LT	213	pnp_dbg("the driver '%s' has been registered", drv->name);
	214
	215	drv->driver.name = drv->name;
	216	drv->driver.bus = &pnp_bus_type;
1da177e4	217
982c6094	218	return driver_register(&drv->driver);
1da177e4 LT	219	}
	220
	221	void pnp_unregister_driver(struct pnp_driver *drv)
	222	{
	223	driver_unregister(&drv->driver);
	224	pnp_dbg("the driver '%s' has been unregistered", drv->name);
	225	}
	226
	227	/**
	228	* pnp_add_id - adds an EISA id to the specified device
1da177e4	229	* @dev: pointer to the desired device
772defc6	230	* @id: pointer to an EISA id string
1da177e4	231	*/
772defc6	232	struct pnp_id pnp_add_id(struct pnp_dev dev, char *id)
1da177e4	233	{
772defc6	234	struct pnp_id dev_id, ptr;
07d4e9af	235
772defc6 BH	236	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	237	if (!dev_id)
	238	return NULL;
	239
	240	dev_id->id[0] = id[0];
	241	dev_id->id[1] = id[1];
	242	dev_id->id[2] = id[2];
	243	dev_id->id[3] = tolower(id[3]);
	244	dev_id->id[4] = tolower(id[4]);
	245	dev_id->id[5] = tolower(id[5]);
	246	dev_id->id[6] = tolower(id[6]);
	247	dev_id->id[7] = '\0';
	248
	249	dev_id->next = NULL;
1da177e4 LT	250	ptr = dev->id;
	251	while (ptr && ptr->next)
	252	ptr = ptr->next;
	253	if (ptr)
772defc6	254	ptr->next = dev_id;
1da177e4	255	else
772defc6 BH	256	dev->id = dev_id;
	257
	258	return dev_id;
1da177e4 LT	259	}
	260
	261	EXPORT_SYMBOL(pnp_register_driver);
	262	EXPORT_SYMBOL(pnp_unregister_driver);
1da177e4 LT	263	EXPORT_SYMBOL(pnp_device_attach);
1da177e4 LT	264	EXPORT_SYMBOL(pnp_device_detach);