2 * linux/drivers/mmc/core/sdio_bus.c
4 * Copyright 2007 Pierre Ossman
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.
11 * SDIO function driver model
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/slab.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/sdio_func.h>
24 #ifdef CONFIG_MMC_EMBEDDED_SDIO
25 #include <linux/mmc/host.h>
28 /* show configuration fields */
29 #define sdio_config_attr(field, format_string) \
31 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
33 struct sdio_func *func; \
35 func = dev_to_sdio_func (dev); \
36 return sprintf (buf, format_string, func->field); \
39 sdio_config_attr(class, "0x%02x\n");
40 sdio_config_attr(vendor, "0x%04x\n");
41 sdio_config_attr(device, "0x%04x\n");
43 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
45 struct sdio_func *func = dev_to_sdio_func (dev);
47 return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
48 func->class, func->vendor, func->device);
51 static struct device_attribute sdio_dev_attrs[] = {
59 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
60 const struct sdio_device_id *id)
62 if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
64 if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
66 if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
71 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
72 struct sdio_driver *sdrv)
74 const struct sdio_device_id *ids;
79 while (ids->class || ids->vendor || ids->device) {
80 if (sdio_match_one(func, ids))
89 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
91 struct sdio_func *func = dev_to_sdio_func(dev);
92 struct sdio_driver *sdrv = to_sdio_driver(drv);
94 if (sdio_match_device(func, sdrv))
101 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
103 struct sdio_func *func = dev_to_sdio_func(dev);
105 if (add_uevent_var(env,
106 "SDIO_CLASS=%02X", func->class))
109 if (add_uevent_var(env,
110 "SDIO_ID=%04X:%04X", func->vendor, func->device))
113 if (add_uevent_var(env,
114 "MODALIAS=sdio:c%02Xv%04Xd%04X",
115 func->class, func->vendor, func->device))
121 static int sdio_bus_probe(struct device *dev)
123 struct sdio_driver *drv = to_sdio_driver(dev->driver);
124 struct sdio_func *func = dev_to_sdio_func(dev);
125 const struct sdio_device_id *id;
128 id = sdio_match_device(func, drv);
132 /* Set the default block size so the driver is sure it's something
134 sdio_claim_host(func);
135 ret = sdio_set_block_size(func, 0);
136 sdio_release_host(func);
140 return drv->probe(func, id);
143 static int sdio_bus_remove(struct device *dev)
145 struct sdio_driver *drv = to_sdio_driver(dev->driver);
146 struct sdio_func *func = dev_to_sdio_func(dev);
150 if (func->irq_handler) {
151 printk(KERN_WARNING "WARNING: driver %s did not remove "
152 "its interrupt handler!\n", drv->name);
153 sdio_claim_host(func);
154 sdio_release_irq(func);
155 sdio_release_host(func);
161 static struct bus_type sdio_bus_type = {
163 .dev_attrs = sdio_dev_attrs,
164 .match = sdio_bus_match,
165 .uevent = sdio_bus_uevent,
166 .probe = sdio_bus_probe,
167 .remove = sdio_bus_remove,
170 int sdio_register_bus(void)
172 return bus_register(&sdio_bus_type);
175 void sdio_unregister_bus(void)
177 bus_unregister(&sdio_bus_type);
181 * sdio_register_driver - register a function driver
182 * @drv: SDIO function driver
184 int sdio_register_driver(struct sdio_driver *drv)
186 drv->drv.name = drv->name;
187 drv->drv.bus = &sdio_bus_type;
188 return driver_register(&drv->drv);
190 EXPORT_SYMBOL_GPL(sdio_register_driver);
193 * sdio_unregister_driver - unregister a function driver
194 * @drv: SDIO function driver
196 void sdio_unregister_driver(struct sdio_driver *drv)
198 drv->drv.bus = &sdio_bus_type;
199 driver_unregister(&drv->drv);
201 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
203 static void sdio_release_func(struct device *dev)
205 struct sdio_func *func = dev_to_sdio_func(dev);
207 #ifdef CONFIG_MMC_EMBEDDED_SDIO
209 * If this device is embedded then we never allocated
210 * cis tables for this func
212 if (!func->card->host->embedded_sdio_data.funcs)
214 sdio_free_func_cis(func);
223 * Allocate and initialise a new SDIO function structure.
225 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
227 struct sdio_func *func;
229 func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
231 return ERR_PTR(-ENOMEM);
235 device_initialize(&func->dev);
237 func->dev.parent = &card->dev;
238 func->dev.bus = &sdio_bus_type;
239 func->dev.release = sdio_release_func;
245 * Register a new SDIO function with the driver model.
247 int sdio_add_func(struct sdio_func *func)
251 dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
253 ret = device_add(&func->dev);
255 sdio_func_set_present(func);
261 * Unregister a SDIO function with the driver model, and
262 * (eventually) free it.
263 * This function can be called through error paths where sdio_add_func() was
264 * never executed (because a failure occurred at an earlier point).
266 void sdio_remove_func(struct sdio_func *func)
268 if (!sdio_func_present(func))
271 device_del(&func->dev);
272 put_device(&func->dev);