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/drivers/pnp/driver.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 274 lines | 222 code | 41 blank | 11 comment | 60 complexity | 6886bc01393438cc1aaa0b3d537a2676 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*
  2 * driver.c - device id matching, driver model, etc.
  3 *
  4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
  5 */
  6
  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>
 12#include <linux/pnp.h>
 13#include "base.h"
 14
 15static int compare_func(const char *ida, const char *idb)
 16{
 17	int i;
 18
 19	/* we only need to compare the last 4 chars */
 20	for (i = 3; i < 7; i++) {
 21		if (ida[i] != 'X' &&
 22		    idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
 23			return 0;
 24	}
 25	return 1;
 26}
 27
 28int compare_pnp_id(struct pnp_id *pos, const char *id)
 29{
 30	if (!pos || !id || (strlen(id) != 7))
 31		return 0;
 32	if (memcmp(id, "ANYDEVS", 7) == 0)
 33		return 1;
 34	while (pos) {
 35		if (memcmp(pos->id, id, 3) == 0)
 36			if (compare_func(pos->id, id) == 1)
 37				return 1;
 38		pos = pos->next;
 39	}
 40	return 0;
 41}
 42
 43static const struct pnp_device_id *match_device(struct pnp_driver *drv,
 44						struct pnp_dev *dev)
 45{
 46	const struct pnp_device_id *drv_id = drv->id_table;
 47
 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
 59int pnp_device_attach(struct pnp_dev *pnp_dev)
 60{
 61	spin_lock(&pnp_lock);
 62	if (pnp_dev->status != PNP_READY) {
 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
 71void 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
 80static 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
 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)
100		   == PNP_DRIVER_RES_DISABLE) {
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	}
111	if (error >= 0) {
112		pnp_dev->driver = pnp_drv;
113		error = 0;
114	} else
115		goto fail;
116
117	return error;
118
119fail:
120	pnp_device_detach(pnp_dev);
121	return error;
122}
123
124static int pnp_device_remove(struct device *dev)
125{
126	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
127	struct pnp_driver *drv = pnp_dev->driver;
128
129	if (drv) {
130		if (drv->remove)
131			drv->remove(pnp_dev);
132		pnp_dev->driver = NULL;
133	}
134	pnp_device_detach(pnp_dev);
135	return 0;
136}
137
138static void pnp_device_shutdown(struct device *dev)
139{
140	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
141	struct pnp_driver *drv = pnp_dev->driver;
142
143	if (drv && drv->shutdown)
144		drv->shutdown(pnp_dev);
145}
146
147static int pnp_bus_match(struct device *dev, struct device_driver *drv)
148{
149	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
150	struct pnp_driver *pnp_drv = to_pnp_driver(drv);
151
152	if (match_device(pnp_drv, pnp_dev) == NULL)
153		return 0;
154	return 1;
155}
156
157static int pnp_bus_suspend(struct device *dev, pm_message_t state)
158{
159	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
160	struct pnp_driver *pnp_drv = pnp_dev->driver;
161	int error;
162
163	if (!pnp_drv)
164		return 0;
165
166	if (pnp_drv->suspend) {
167		error = pnp_drv->suspend(pnp_dev, state);
168		if (error)
169			return error;
170	}
171
172	if (pnp_can_disable(pnp_dev)) {
173		error = pnp_stop_dev(pnp_dev);
174		if (error)
175			return error;
176	}
177
178	if (pnp_dev->protocol->suspend)
179		pnp_dev->protocol->suspend(pnp_dev, state);
180	return 0;
181}
182
183static int pnp_bus_resume(struct device *dev)
184{
185	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
186	struct pnp_driver *pnp_drv = pnp_dev->driver;
187	int error;
188
189	if (!pnp_drv)
190		return 0;
191
192	if (pnp_dev->protocol->resume) {
193		error = pnp_dev->protocol->resume(pnp_dev);
194		if (error)
195			return error;
196	}
197
198	if (pnp_can_write(pnp_dev)) {
199		error = pnp_start_dev(pnp_dev);
200		if (error)
201			return error;
202	}
203
204	if (pnp_drv->resume) {
205		error = pnp_drv->resume(pnp_dev);
206		if (error)
207			return error;
208	}
209
210	return 0;
211}
212
213struct bus_type pnp_bus_type = {
214	.name    = "pnp",
215	.match   = pnp_bus_match,
216	.probe   = pnp_device_probe,
217	.remove  = pnp_device_remove,
218	.shutdown = pnp_device_shutdown,
219	.suspend = pnp_bus_suspend,
220	.resume  = pnp_bus_resume,
221	.dev_attrs = pnp_interface_attrs,
222};
223
224int pnp_register_driver(struct pnp_driver *drv)
225{
226	drv->driver.name = drv->name;
227	drv->driver.bus = &pnp_bus_type;
228
229	return driver_register(&drv->driver);
230}
231
232void pnp_unregister_driver(struct pnp_driver *drv)
233{
234	driver_unregister(&drv->driver);
235}
236
237/**
238 * pnp_add_id - adds an EISA id to the specified device
239 * @dev: pointer to the desired device
240 * @id: pointer to an EISA id string
241 */
242struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
243{
244	struct pnp_id *dev_id, *ptr;
245
246	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
247	if (!dev_id)
248		return NULL;
249
250	dev_id->id[0] = id[0];
251	dev_id->id[1] = id[1];
252	dev_id->id[2] = id[2];
253	dev_id->id[3] = tolower(id[3]);
254	dev_id->id[4] = tolower(id[4]);
255	dev_id->id[5] = tolower(id[5]);
256	dev_id->id[6] = tolower(id[6]);
257	dev_id->id[7] = '\0';
258
259	dev_id->next = NULL;
260	ptr = dev->id;
261	while (ptr && ptr->next)
262		ptr = ptr->next;
263	if (ptr)
264		ptr->next = dev_id;
265	else
266		dev->id = dev_id;
267
268	return dev_id;
269}
270
271EXPORT_SYMBOL(pnp_register_driver);
272EXPORT_SYMBOL(pnp_unregister_driver);
273EXPORT_SYMBOL(pnp_device_attach);
274EXPORT_SYMBOL(pnp_device_detach);