sdio_bus.c revision 22bfc979d38f57d5b10d141990175d8fc47f6775 
1/*
2 *  linux/drivers/mmc/core/sdio_bus.c
3 *
4 *  Copyright 2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * SDIO function driver model
12 */
13
14#include <linux/device.h>
15#include <linux/err.h>
16
17#include <linux/mmc/card.h>
18#include <linux/mmc/sdio_func.h>
19
20#include "sdio_cis.h"
21#include "sdio_bus.h"
22
23#define dev_to_sdio_func(d)	container_of(d, struct sdio_func, dev)
24#define to_sdio_driver(d)      container_of(d, struct sdio_driver, drv)
25
26/* show configuration fields */
27#define sdio_config_attr(field, format_string)				\
28static ssize_t								\
29field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
30{									\
31	struct sdio_func *func;						\
32									\
33	func = dev_to_sdio_func (dev);					\
34	return sprintf (buf, format_string, func->field);		\
35}
36
37sdio_config_attr(class, "0x%02x\n");
38sdio_config_attr(vendor, "0x%04x\n");
39sdio_config_attr(device, "0x%04x\n");
40
41static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
42{
43	struct sdio_func *func = dev_to_sdio_func (dev);
44
45	return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
46			func->class, func->vendor, func->device);
47}
48
49static struct device_attribute sdio_dev_attrs[] = {
50	__ATTR_RO(class),
51	__ATTR_RO(vendor),
52	__ATTR_RO(device),
53	__ATTR_RO(modalias),
54	__ATTR_NULL,
55};
56
57static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
58	const struct sdio_device_id *id)
59{
60	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
61		return NULL;
62	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
63		return NULL;
64	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
65		return NULL;
66	return id;
67}
68
69static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
70	struct sdio_driver *sdrv)
71{
72	const struct sdio_device_id *ids;
73
74	ids = sdrv->id_table;
75
76	if (ids) {
77		while (ids->class || ids->vendor || ids->device) {
78			if (sdio_match_one(func, ids))
79				return ids;
80			ids++;
81		}
82	}
83
84	return NULL;
85}
86
87static int sdio_bus_match(struct device *dev, struct device_driver *drv)
88{
89	struct sdio_func *func = dev_to_sdio_func(dev);
90	struct sdio_driver *sdrv = to_sdio_driver(drv);
91
92	if (sdio_match_device(func, sdrv))
93		return 1;
94
95	return 0;
96}
97
98static int
99sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
100		int buf_size)
101{
102	struct sdio_func *func = dev_to_sdio_func(dev);
103	int i = 0, length = 0;
104
105	if (add_uevent_var(envp, num_envp, &i,
106			buf, buf_size, &length,
107			"SDIO_CLASS=%02X", func->class))
108		return -ENOMEM;
109
110	if (add_uevent_var(envp, num_envp, &i,
111			buf, buf_size, &length,
112			"SDIO_ID=%04X:%04X", func->vendor, func->device))
113		return -ENOMEM;
114
115	if (add_uevent_var(envp, num_envp, &i,
116			buf, buf_size, &length,
117			"MODALIAS=sdio:c%02Xv%04Xd%04X",
118			func->class, func->vendor, func->device))
119		return -ENOMEM;
120
121	envp[i] = NULL;
122
123	return 0;
124}
125
126static int sdio_bus_probe(struct device *dev)
127{
128	struct sdio_driver *drv = to_sdio_driver(dev->driver);
129	struct sdio_func *func = dev_to_sdio_func(dev);
130	const struct sdio_device_id *id;
131
132	id = sdio_match_device(func, drv);
133	if (!id)
134		return -ENODEV;
135
136	return drv->probe(func, id);
137}
138
139static int sdio_bus_remove(struct device *dev)
140{
141	struct sdio_driver *drv = to_sdio_driver(dev->driver);
142	struct sdio_func *func = dev_to_sdio_func(dev);
143
144	drv->remove(func);
145
146	if (func->irq_handler) {
147		printk(KERN_WARNING "WARNING: driver %s did not remove "
148			"its interrupt handler!\n", drv->name);
149		sdio_claim_host(func);
150		sdio_release_irq(func);
151		sdio_release_host(func);
152	}
153
154	return 0;
155}
156
157static struct bus_type sdio_bus_type = {
158	.name		= "sdio",
159	.dev_attrs	= sdio_dev_attrs,
160	.match		= sdio_bus_match,
161	.uevent		= sdio_bus_uevent,
162	.probe		= sdio_bus_probe,
163	.remove		= sdio_bus_remove,
164};
165
166int sdio_register_bus(void)
167{
168	return bus_register(&sdio_bus_type);
169}
170
171void sdio_unregister_bus(void)
172{
173	bus_unregister(&sdio_bus_type);
174}
175
176/**
177 *	sdio_register_driver - register a function driver
178 *	@drv: SDIO function driver
179 */
180int sdio_register_driver(struct sdio_driver *drv)
181{
182	drv->drv.name = drv->name;
183	drv->drv.bus = &sdio_bus_type;
184	return driver_register(&drv->drv);
185}
186EXPORT_SYMBOL_GPL(sdio_register_driver);
187
188/**
189 *	sdio_unregister_driver - unregister a function driver
190 *	@drv: SDIO function driver
191 */
192void sdio_unregister_driver(struct sdio_driver *drv)
193{
194	drv->drv.bus = &sdio_bus_type;
195	driver_unregister(&drv->drv);
196}
197EXPORT_SYMBOL_GPL(sdio_unregister_driver);
198
199static void sdio_release_func(struct device *dev)
200{
201	struct sdio_func *func = dev_to_sdio_func(dev);
202
203	sdio_free_func_cis(func);
204
205	kfree(func);
206}
207
208/*
209 * Allocate and initialise a new SDIO function structure.
210 */
211struct sdio_func *sdio_alloc_func(struct mmc_card *card)
212{
213	struct sdio_func *func;
214
215	func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
216	if (!func)
217		return ERR_PTR(-ENOMEM);
218
219	memset(func, 0, sizeof(struct sdio_func));
220
221	func->card = card;
222
223	device_initialize(&func->dev);
224
225	func->dev.parent = &card->dev;
226	func->dev.bus = &sdio_bus_type;
227	func->dev.release = sdio_release_func;
228
229	return func;
230}
231
232/*
233 * Register a new SDIO function with the driver model.
234 */
235int sdio_add_func(struct sdio_func *func)
236{
237	int ret;
238
239	snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
240		 "%s:%d", mmc_card_id(func->card), func->num);
241
242	ret = device_add(&func->dev);
243	if (ret == 0)
244		sdio_func_set_present(func);
245
246	return ret;
247}
248
249/*
250 * Unregister a SDIO function with the driver model, and
251 * (eventually) free it.
252 */
253void sdio_remove_func(struct sdio_func *func)
254{
255	if (sdio_func_present(func))
256		device_del(&func->dev);
257
258	put_device(&func->dev);
259}
260
261