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
88 return retval;
89 }
90
91 static int mmc_bus_probe(struct device *dev)
92 {
93 struct mmc_driver *drv = to_mmc_driver(dev->driver);
94 struct mmc_card *card = dev_to_mmc_card(dev);
95
96 return drv->probe(card);
97 }
98
99 static int mmc_bus_remove(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 drv->remove(card);
105
106 return 0;
107 }
108
109 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
110 {
111 struct mmc_driver *drv = to_mmc_driver(dev->driver);
112 struct mmc_card *card = dev_to_mmc_card(dev);
113 int ret = 0;
114
115 if (dev->driver && drv->suspend)
116 ret = drv->suspend(card, state);
117 return ret;
118 }
119
120 static int mmc_bus_resume(struct device *dev)
121 {
122 struct mmc_driver *drv = to_mmc_driver(dev->driver);
123 struct mmc_card *card = dev_to_mmc_card(dev);
124 int ret = 0;
125
126 if (dev->driver && drv->resume)
127 ret = drv->resume(card);
128 return ret;
129 }
130
131 static struct bus_type mmc_bus_type = {
132 .name = "mmc",
133 .dev_attrs = mmc_dev_attrs,
134 .match = mmc_bus_match,
135 .uevent = mmc_bus_uevent,
136 .probe = mmc_bus_probe,
137 .remove = mmc_bus_remove,
138 .suspend = mmc_bus_suspend,
139 .resume = mmc_bus_resume,
140 };
141
142 int mmc_register_bus(void)
143 {
144 return bus_register(&mmc_bus_type);
145 }
146
147 void mmc_unregister_bus(void)
148 {
149 bus_unregister(&mmc_bus_type);
150 }
151
152 /**
153 * mmc_register_driver - register a media driver
154 * @drv: MMC media driver
155 */
156 int mmc_register_driver(struct mmc_driver *drv)
157 {
158 drv->drv.bus = &mmc_bus_type;
159 return driver_register(&drv->drv);
160 }
161
162 EXPORT_SYMBOL(mmc_register_driver);
163
164 /**
165 * mmc_unregister_driver - unregister a media driver
166 * @drv: MMC media driver
167 */
168 void mmc_unregister_driver(struct mmc_driver *drv)
169 {
170 drv->drv.bus = &mmc_bus_type;
171 driver_unregister(&drv->drv);
172 }
173
174 EXPORT_SYMBOL(mmc_unregister_driver);
175
176 static void mmc_release_card(struct device *dev)
177 {
178 struct mmc_card *card = dev_to_mmc_card(dev);
179
180 sdio_free_common_cis(card);
181
182 if (card->info)
183 kfree(card->info);
184
185 kfree(card);
186 }
187
188 /*
189 * Allocate and initialise a new MMC card structure.
190 */
191 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
192 {
193 struct mmc_card *card;
194
195 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
196 if (!card)
197 return ERR_PTR(-ENOMEM);
198
199 card->host = host;
200
201 device_initialize(&card->dev);
202
203 card->dev.parent = mmc_classdev(host);
204 card->dev.bus = &mmc_bus_type;
205 card->dev.release = mmc_release_card;
206 card->dev.type = type;
207
208 return card;
209 }
210
211 /*
212 * Register a new MMC card with the driver model.
213 */
214 int mmc_add_card(struct mmc_card *card)
215 {
216 int ret;
217 const char *type;
218
219 snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
220 "%s:%04x", mmc_hostname(card->host), card->rca);
221
222 switch (card->type) {
223 case MMC_TYPE_MMC:
224 type = "MMC";
225 break;
226 case MMC_TYPE_SD:
227 type = "SD";
228 if (mmc_card_blockaddr(card))
229 type = "SDHC";
230 break;
231 case MMC_TYPE_SDIO:
232 type = "SDIO";
233 break;
234 default:
235 type = "?";
236 break;
237 }
238
239 if (mmc_host_is_spi(card->host)) {
240 printk(KERN_INFO "%s: new %s%s card on SPI\n",
241 mmc_hostname(card->host),
242 mmc_card_highspeed(card) ? "high speed " : "",
243 type);
244 } else {
245 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
246 mmc_hostname(card->host),
247 mmc_card_highspeed(card) ? "high speed " : "",
248 type, card->rca);
249 }
250
251 ret = device_add(&card->dev);
252 if (ret)
253 return ret;
254
255 mmc_card_set_present(card);
256
257 return 0;
258 }
259
260 /*
261 * Unregister a new MMC card with the driver model, and
262 * (eventually) free it.
263 */
264 void mmc_remove_card(struct mmc_card *card)
265 {
266 if (mmc_card_present(card)) {
267 if (mmc_host_is_spi(card->host)) {
268 printk(KERN_INFO "%s: SPI card removed\n",
269 mmc_hostname(card->host));
270 } else {
271 printk(KERN_INFO "%s: card %04x removed\n",
272 mmc_hostname(card->host), card->rca);
273 }
274 device_del(&card->dev);
275 }
276
277 put_device(&card->dev);
278 }
279
280
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