sdio_bus.c revision 9a08f82b3cc522f727ace580a2aaee5402435bc8 
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	int ret;
132
133	id = sdio_match_device(func, drv);
134	if (!id)
135		return -ENODEV;
136
137	/* Set the default block size so the driver is sure it's something
138	 * sensible. */
139	sdio_claim_host(func);
140	ret = sdio_set_block_size(func, 0);
141	sdio_release_host(func);
142	if (ret)
143		return ret;
144
145	return drv->probe(func, id);
146}
147
148static int sdio_bus_remove(struct device *dev)
149{
150	struct sdio_driver *drv = to_sdio_driver(dev->driver);
151	struct sdio_func *func = dev_to_sdio_func(dev);
152
153	drv->remove(func);
154
155	if (func->irq_handler) {
156		printk(KERN_WARNING "WARNING: driver %s did not remove "
157			"its interrupt handler!\n", drv->name);
158		sdio_claim_host(func);
159		sdio_release_irq(func);
160		sdio_release_host(func);
161	}
162
163	return 0;
164}
165
166static struct bus_type sdio_bus_type = {
167	.name		= "sdio",
168	.dev_attrs	= sdio_dev_attrs,
169	.match		= sdio_bus_match,
170	.uevent		= sdio_bus_uevent,
171	.probe		= sdio_bus_probe,
172	.remove		= sdio_bus_remove,
173};
174
175int sdio_register_bus(void)
176{
177	return bus_register(&sdio_bus_type);
178}
179
180void sdio_unregister_bus(void)
181{
182	bus_unregister(&sdio_bus_type);
183}
184
185/**
186 *	sdio_register_driver - register a function driver
187 *	@drv: SDIO function driver
188 */
189int sdio_register_driver(struct sdio_driver *drv)
190{
191	drv->drv.name = drv->name;
192	drv->drv.bus = &sdio_bus_type;
193	return driver_register(&drv->drv);
194}
195EXPORT_SYMBOL_GPL(sdio_register_driver);
196
197/**
198 *	sdio_unregister_driver - unregister a function driver
199 *	@drv: SDIO function driver
200 */
201void sdio_unregister_driver(struct sdio_driver *drv)
202{
203	drv->drv.bus = &sdio_bus_type;
204	driver_unregister(&drv->drv);
205}
206EXPORT_SYMBOL_GPL(sdio_unregister_driver);
207
208static void sdio_release_func(struct device *dev)
209{
210	struct sdio_func *func = dev_to_sdio_func(dev);
211
212	sdio_free_func_cis(func);
213
214	kfree(func);
215}
216
217/*
218 * Allocate and initialise a new SDIO function structure.
219 */
220struct sdio_func *sdio_alloc_func(struct mmc_card *card)
221{
222	struct sdio_func *func;
223
224	func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
225	if (!func)
226		return ERR_PTR(-ENOMEM);
227
228	memset(func, 0, sizeof(struct sdio_func));
229
230	func->card = card;
231
232	device_initialize(&func->dev);
233
234	func->dev.parent = &card->dev;
235	func->dev.bus = &sdio_bus_type;
236	func->dev.release = sdio_release_func;
237
238	return func;
239}
240
241/*
242 * Register a new SDIO function with the driver model.
243 */
244int sdio_add_func(struct sdio_func *func)
245{
246	int ret;
247
248	snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
249		 "%s:%d", mmc_card_id(func->card), func->num);
250
251	ret = device_add(&func->dev);
252	if (ret == 0)
253		sdio_func_set_present(func);
254
255	return ret;
256}
257
258/*
259 * Unregister a SDIO function with the driver model, and
260 * (eventually) free it.
261 */
262void sdio_remove_func(struct sdio_func *func)
263{
264	if (sdio_func_present(func))
265		device_del(&func->dev);
266
267	put_device(&func->dev);
268}
269
270