1 /*
2 * linux/drivers/mmc/core/bus.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007 Pierre Ossman
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * MMC card bus 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/host.h>
19
20 #include "core.h"
21 #include "sdio_cis.h"
22 #include "bus.h"
23
24 #define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
25 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
26
27 static ssize_t mmc_type_show(struct device *dev,
28 struct device_attribute *attr, char *buf)
29 {
30 struct mmc_card *card = dev_to_mmc_card(dev);
31
32 switch (card->type) {
33 case MMC_TYPE_MMC:
34 return sprintf(buf, "MMC\n");
35 case MMC_TYPE_SD:
36 return sprintf(buf, "SD\n");
37 case MMC_TYPE_SDIO:
38 return sprintf(buf, "SDIO\n");
39 default:
40 return -EFAULT;
41 }
42 }
43
44 static struct device_attribute mmc_dev_attrs[] = {
45 __ATTR(type, S_IRUGO, mmc_type_show, NULL),
46 __ATTR_NULL,
47 };
48
49 /*
50 * This currently matches any MMC driver to any MMC card - drivers
51 * themselves make the decision whether to drive this card in their
52 * probe method.
53 */
54 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
55 {
56 return 1;
57 }
58
59 static int
60 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
61 {
62 struct mmc_card *card = dev_to_mmc_card(dev);
63 const char *type;
64 int retval = 0;
65
66 switch (card->type) {
67 case MMC_TYPE_MMC:
68 type = "MMC";
69 break;
70 case MMC_TYPE_SD:
71 type = "SD";
72 break;
73 case MMC_TYPE_SDIO:
74 type = "SDIO";
75 break;
76 default:
77 type = NULL;
78 }
79
80 if (type) {
81 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
82 if (retval)
83 return retval;
84 }
85
86 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
87 if (retval)
88 return retval;
89
90 /*
91 * Request the mmc_block device. Note: that this is a direct request
92 * for the module it carries no information as to what is inserted.
93 */
94 retval = add_uevent_var(env, "MODALIAS=mmc:block");
95
96 return retval;
97 }
98
99 static int mmc_bus_probe(struct device *dev)
100 {
101 struct mmc_driver *drv = to_mmc_driver(dev->driver);
102 struct mmc_card *card = dev_to_mmc_card(dev);
103
104 return drv->probe(card);
105 }
106
107 static int mmc_bus_remove(struct device *dev)
108 {
109 struct mmc_driver *drv = to_mmc_driver(dev->driver);
110 struct mmc_card *card = dev_to_mmc_card(dev);
111
112 drv->remove(card);
113
114 return 0;
115 }
116
117 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
118 {
119 struct mmc_driver *drv = to_mmc_driver(dev->driver);
120 struct mmc_card *card = dev_to_mmc_card(dev);
121 int ret = 0;
122
123 if (dev->driver && drv->suspend)
124 ret = drv->suspend(card, state);
125 return ret;
126 }
127
128 static int mmc_bus_resume(struct device *dev)
129 {
130 struct mmc_driver *drv = to_mmc_driver(dev->driver);
131 struct mmc_card *card = dev_to_mmc_card(dev);
132 int ret = 0;
133
134 if (dev->driver && drv->resume)
135 ret = drv->resume(card);
136 return ret;
137 }
138
139 static struct bus_type mmc_bus_type = {
140 .name = "mmc",
141 .dev_attrs = mmc_dev_attrs,
142 .match = mmc_bus_match,
143 .uevent = mmc_bus_uevent,
144 .probe = mmc_bus_probe,
145 .remove = mmc_bus_remove,
146 .suspend = mmc_bus_suspend,
147 .resume = mmc_bus_resume,
148 };
149
150 int mmc_register_bus(void)
151 {
152 return bus_register(&mmc_bus_type);
153 }
154
155 void mmc_unregister_bus(void)
156 {
157 bus_unregister(&mmc_bus_type);
158 }
159
160 /**
161 * mmc_register_driver - register a media driver
162 * @drv: MMC media driver
163 */
164 int mmc_register_driver(struct mmc_driver *drv)
165 {
166 drv->drv.bus = &mmc_bus_type;
167 return driver_register(&drv->drv);
168 }
169
170 EXPORT_SYMBOL(mmc_register_driver);
171
172 /**
173 * mmc_unregister_driver - unregister a media driver
174 * @drv: MMC media driver
175 */
176 void mmc_unregister_driver(struct mmc_driver *drv)
177 {
178 drv->drv.bus = &mmc_bus_type;
179 driver_unregister(&drv->drv);
180 }
181
182 EXPORT_SYMBOL(mmc_unregister_driver);
183
184 static void mmc_release_card(struct device *dev)
185 {
186 struct mmc_card *card = dev_to_mmc_card(dev);
187
188 sdio_free_common_cis(card);
189
190 if (card->info)
191 kfree(card->info);
192
193 kfree(card);
194 }
195
196 /*
197 * Allocate and initialise a new MMC card structure.
198 */
199 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
200 {
201 struct mmc_card *card;
202
203 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
204 if (!card)
205 return ERR_PTR(-ENOMEM);
206
207 card->host = host;
208
209 device_initialize(&card->dev);
210
211 card->dev.parent = mmc_classdev(host);
212 card->dev.bus = &mmc_bus_type;
213 card->dev.release = mmc_release_card;
214 card->dev.type = type;
215
216 return card;
217 }
218
219 /*
220 * Register a new MMC card with the driver model.
221 */
222 int mmc_add_card(struct mmc_card *card)
223 {
224 int ret;
225 const char *type;
226
227 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
228
229 switch (card->type) {
230 case MMC_TYPE_MMC:
231 type = "MMC";
232 break;
233 case MMC_TYPE_SD:
234 type = "SD";
235 if (mmc_card_blockaddr(card))
236 type = "SDHC";
237 break;
238 case MMC_TYPE_SDIO:
239 type = "SDIO";
240 break;
241 default:
242 type = "?";
243 break;
244 }
245
246 if (mmc_host_is_spi(card->host)) {
247 printk(KERN_INFO "%s: new %s%s card on SPI\n",
248 mmc_hostname(card->host),
249 mmc_card_highspeed(card) ? "high speed " : "",
250 type);
251 } else {
252 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
253 mmc_hostname(card->host),
254 mmc_card_highspeed(card) ? "high speed " : "",
255 type, card->rca);
256 }
257
258 ret = device_add(&card->dev);
259 if (ret)
260 return ret;
261
262 #ifdef CONFIG_DEBUG_FS
263 mmc_add_card_debugfs(card);
264 #endif
265
266 mmc_card_set_present(card);
267
268 return 0;
269 }
270
271 /*
272 * Unregister a new MMC card with the driver model, and
273 * (eventually) free it.
274 */
275 void mmc_remove_card(struct mmc_card *card)
276 {
277 #ifdef CONFIG_DEBUG_FS
278 mmc_remove_card_debugfs(card);
279 #endif
280
281 if (mmc_card_present(card)) {
282 if (mmc_host_is_spi(card->host)) {
283 printk(KERN_INFO "%s: SPI card removed\n",
284 mmc_hostname(card->host));
285 } else {
286 printk(KERN_INFO "%s: card %04x removed\n",
287 mmc_hostname(card->host), card->rca);
288 }
289 device_del(&card->dev);
290 }
291
292 put_device(&card->dev);
293 }
294
295
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