[mirror_ubuntu-zesty-kernel.git] / drivers / pnp / driver.c

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

#include <linux/config.h>
#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;
}


struct bus_type pnp_bus_type = {
	.name	= "pnp",
	.match	= pnp_bus_match,
};


static int count_devices(struct device * dev, void * c)
{
	int * count = c;
	(*count)++;
	return 0;
}

int pnp_register_driver(struct pnp_driver *drv)
{
	int count;

	pnp_dbg("the driver '%s' has been registered", drv->name);

	drv->driver.name = drv->name;
	drv->driver.bus = &pnp_bus_type;
	drv->driver.probe = pnp_device_probe;
	drv->driver.remove = pnp_device_remove;

	count = driver_register(&drv->driver);

	/* get the number of initial matches */
	if (count >= 0){
		count = 0;
		driver_for_each_device(&drv->driver, NULL, &count, count_devices);
	}
	return count;
}

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;
	if (!id)
		return -EINVAL;
	if (!dev)
		return -EINVAL;
	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);
#if 0
EXPORT_SYMBOL(pnp_add_id);
#endif
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>
	5	*
	6	*/
	7
	8	#include <linux/config.h>
	9	#include <linux/string.h>
	10	#include <linux/list.h>
	11	#include <linux/module.h>
	12	#include <linux/ctype.h>
	13	#include <linux/slab.h>
1da177e4 LT	14	#include <linux/pnp.h>
	15	#include "base.h"
	16
	17	static int compare_func(const char ida, const char idb)
	18	{
	19	int i;
	20	/* we only need to compare the last 4 chars */
	21	for (i=3; i<7; i++)
	22	{
	23	if (ida[i] != 'X' &&
	24	idb[i] != 'X' &&
	25	toupper(ida[i]) != toupper(idb[i]))
	26	return 0;
	27	}
	28	return 1;
	29	}
	30
	31	int compare_pnp_id(struct pnp_id pos, const char id)
	32	{
	33	if (!pos \|\| !id \|\| (strlen(id) != 7))
	34	return 0;
	35	if (memcmp(id,"ANYDEVS",7)==0)
	36	return 1;
	37	while (pos){
	38	if (memcmp(pos->id,id,3)==0)
	39	if (compare_func(pos->id,id)==1)
	40	return 1;
	41	pos = pos->next;
	42	}
	43	return 0;
	44	}
	45
	46	static const struct pnp_device_id * match_device(struct pnp_driver drv, struct pnp_dev dev)
	47	{
	48	const struct pnp_device_id *drv_id = drv->id_table;
	49	if (!drv_id)
	50	return NULL;
	51
	52	while (*drv_id->id) {
	53	if (compare_pnp_id(dev->id, drv_id->id))
	54	return drv_id;
	55	drv_id++;
	56	}
	57	return NULL;
	58	}
	59
	60	int pnp_device_attach(struct pnp_dev *pnp_dev)
	61	{
	62	spin_lock(&pnp_lock);
	63	if(pnp_dev->status != PNP_READY){
	64	spin_unlock(&pnp_lock);
	65	return -EBUSY;
	66	}
	67	pnp_dev->status = PNP_ATTACHED;
	68	spin_unlock(&pnp_lock);
	69	return 0;
	70	}
	71
	72	void pnp_device_detach(struct pnp_dev *pnp_dev)
	73	{
	74	spin_lock(&pnp_lock);
	75	if (pnp_dev->status == PNP_ATTACHED)
	76	pnp_dev->status = PNP_READY;
	77	spin_unlock(&pnp_lock);
78	pnp_disable_dev(pnp_dev);
79	}
80
81	static int pnp_device_probe(struct device *dev)
82	{
83	int error;
84	struct pnp_driver *pnp_drv;
85	struct pnp_dev *pnp_dev;
86	const struct pnp_device_id *dev_id = NULL;
87	pnp_dev = to_pnp_dev(dev);
88	pnp_drv = to_pnp_driver(dev->driver);
89
90	pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name);
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)
103	== PNP_DRIVER_RES_DISABLE) {
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	}
114	if (error >= 0){
115	pnp_dev->driver = pnp_drv;
116	error = 0;
117	} else
118	goto fail;
119	return error;
120
121	fail:
122	pnp_device_detach(pnp_dev);
123	return error;
124	}
125
126	static int pnp_device_remove(struct device *dev)
127	{
128	struct pnp_dev * pnp_dev = to_pnp_dev(dev);
129	struct pnp_driver * drv = pnp_dev->driver;
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	{
142	struct pnp_dev * pnp_dev = to_pnp_dev(dev);
143	struct pnp_driver * pnp_drv = to_pnp_driver(drv);
144	if (match_device(pnp_drv, pnp_dev) == NULL)
145	return 0;
146	return 1;
147	}
148
149
150	struct bus_type pnp_bus_type = {
151	.name = "pnp",
152	.match = pnp_bus_match,
153	};
154
155
8d618afd PM	156	static int count_devices(struct device * dev, void * c)
	157	{
	158	int * count = c;
	159	(*count)++;
	160	return 0;
	161	}
	162
1da177e4 LT	163	int pnp_register_driver(struct pnp_driver *drv)
	164	{
	165	int count;
1da177e4 LT	166
	167	pnp_dbg("the driver '%s' has been registered", drv->name);
	168
	169	drv->driver.name = drv->name;
	170	drv->driver.bus = &pnp_bus_type;
	171	drv->driver.probe = pnp_device_probe;
	172	drv->driver.remove = pnp_device_remove;
	173
	174	count = driver_register(&drv->driver);
	175
	176	/* get the number of initial matches */
	177	if (count >= 0){
	178	count = 0;
8d618afd	179	driver_for_each_device(&drv->driver, NULL, &count, count_devices);
1da177e4 LT	180	}
	181	return count;
	182	}
	183
	184	void pnp_unregister_driver(struct pnp_driver *drv)
	185	{
	186	driver_unregister(&drv->driver);
	187	pnp_dbg("the driver '%s' has been unregistered", drv->name);
	188	}
	189
	190	/**
	191	* pnp_add_id - adds an EISA id to the specified device
	192	* @id: pointer to a pnp_id structure
	193	* @dev: pointer to the desired device
	194	*
	195	*/
	196
	197	int pnp_add_id(struct pnp_id id, struct pnp_dev dev)
	198	{
	199	struct pnp_id *ptr;
	200	if (!id)
	201	return -EINVAL;
	202	if (!dev)
	203	return -EINVAL;
	204	id->next = NULL;
	205	ptr = dev->id;
	206	while (ptr && ptr->next)
	207	ptr = ptr->next;
	208	if (ptr)
	209	ptr->next = id;
	210	else
	211	dev->id = id;
	212	return 0;
	213	}
	214
	215	EXPORT_SYMBOL(pnp_register_driver);
	216	EXPORT_SYMBOL(pnp_unregister_driver);
b449f63c	217	#if 0
1da177e4	218	EXPORT_SYMBOL(pnp_add_id);
b449f63c	219	#endif
1da177e4 LT	220	EXPORT_SYMBOL(pnp_device_attach);
1da177e4 LT	221	EXPORT_SYMBOL(pnp_device_detach);