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/export.h>
15 #include <linux/device.h>
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/stat.h>
19 #include <linux/of.h>
20 #include <linux/pm_runtime.h>
21
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
24
25 #include "core.h"
26 #include "sdio_cis.h"
27 #include "bus.h"
28
29 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
30
type_show(struct device * dev,struct device_attribute * attr,char * buf)31 static ssize_t type_show(struct device *dev,
32 struct device_attribute *attr, char *buf)
33 {
34 struct mmc_card *card = mmc_dev_to_card(dev);
35
36 switch (card->type) {
37 case MMC_TYPE_MMC:
38 return sprintf(buf, "MMC\n");
39 case MMC_TYPE_SD:
40 return sprintf(buf, "SD\n");
41 case MMC_TYPE_SDIO:
42 return sprintf(buf, "SDIO\n");
43 case MMC_TYPE_SD_COMBO:
44 return sprintf(buf, "SDcombo\n");
45 default:
46 return -EFAULT;
47 }
48 }
49 static DEVICE_ATTR_RO(type);
50
51 static struct attribute *mmc_dev_attrs[] = {
52 &dev_attr_type.attr,
53 NULL,
54 };
55 ATTRIBUTE_GROUPS(mmc_dev);
56
57 /*
58 * This currently matches any MMC driver to any MMC card - drivers
59 * themselves make the decision whether to drive this card in their
60 * probe method.
61 */
mmc_bus_match(struct device * dev,struct device_driver * drv)62 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
63 {
64 return 1;
65 }
66
67 static int
mmc_bus_uevent(struct device * dev,struct kobj_uevent_env * env)68 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
69 {
70 struct mmc_card *card = mmc_dev_to_card(dev);
71 const char *type;
72 int retval = 0;
73
74 switch (card->type) {
75 case MMC_TYPE_MMC:
76 type = "MMC";
77 break;
78 case MMC_TYPE_SD:
79 type = "SD";
80 break;
81 case MMC_TYPE_SDIO:
82 type = "SDIO";
83 break;
84 case MMC_TYPE_SD_COMBO:
85 type = "SDcombo";
86 break;
87 default:
88 type = NULL;
89 }
90
91 if (type) {
92 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
93 if (retval)
94 return retval;
95 }
96
97 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
98 if (retval)
99 return retval;
100
101 /*
102 * Request the mmc_block device. Note: that this is a direct request
103 * for the module it carries no information as to what is inserted.
104 */
105 retval = add_uevent_var(env, "MODALIAS=mmc:block");
106
107 return retval;
108 }
109
mmc_bus_probe(struct device * dev)110 static int mmc_bus_probe(struct device *dev)
111 {
112 struct mmc_driver *drv = to_mmc_driver(dev->driver);
113 struct mmc_card *card = mmc_dev_to_card(dev);
114
115 return drv->probe(card);
116 }
117
mmc_bus_remove(struct device * dev)118 static int mmc_bus_remove(struct device *dev)
119 {
120 struct mmc_driver *drv = to_mmc_driver(dev->driver);
121 struct mmc_card *card = mmc_dev_to_card(dev);
122
123 drv->remove(card);
124
125 return 0;
126 }
127
mmc_bus_shutdown(struct device * dev)128 static void mmc_bus_shutdown(struct device *dev)
129 {
130 struct mmc_driver *drv = to_mmc_driver(dev->driver);
131 struct mmc_card *card = mmc_dev_to_card(dev);
132 struct mmc_host *host = card->host;
133 int ret;
134
135 if (dev->driver && drv->shutdown)
136 drv->shutdown(card);
137
138 if (host->bus_ops->shutdown) {
139 ret = host->bus_ops->shutdown(host);
140 if (ret)
141 pr_warn("%s: error %d during shutdown\n",
142 mmc_hostname(host), ret);
143 }
144 }
145
146 #ifdef CONFIG_PM_SLEEP
mmc_bus_suspend(struct device * dev)147 static int mmc_bus_suspend(struct device *dev)
148 {
149 struct mmc_card *card = mmc_dev_to_card(dev);
150 struct mmc_host *host = card->host;
151 int ret;
152
153 ret = pm_generic_suspend(dev);
154 if (ret)
155 return ret;
156
157 ret = host->bus_ops->suspend(host);
158 if (ret)
159 pm_generic_resume(dev);
160
161 return ret;
162 }
163
mmc_bus_resume(struct device * dev)164 static int mmc_bus_resume(struct device *dev)
165 {
166 struct mmc_card *card = mmc_dev_to_card(dev);
167 struct mmc_host *host = card->host;
168 int ret;
169
170 ret = host->bus_ops->resume(host);
171 if (ret)
172 pr_warn("%s: error %d during resume (card was removed?)\n",
173 mmc_hostname(host), ret);
174
175 ret = pm_generic_resume(dev);
176 return ret;
177 }
178 #endif
179
180 #ifdef CONFIG_PM
mmc_runtime_suspend(struct device * dev)181 static int mmc_runtime_suspend(struct device *dev)
182 {
183 struct mmc_card *card = mmc_dev_to_card(dev);
184 struct mmc_host *host = card->host;
185
186 return host->bus_ops->runtime_suspend(host);
187 }
188
mmc_runtime_resume(struct device * dev)189 static int mmc_runtime_resume(struct device *dev)
190 {
191 struct mmc_card *card = mmc_dev_to_card(dev);
192 struct mmc_host *host = card->host;
193
194 return host->bus_ops->runtime_resume(host);
195 }
196 #endif /* !CONFIG_PM */
197
198 static const struct dev_pm_ops mmc_bus_pm_ops = {
199 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
200 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
201 };
202
203 static struct bus_type mmc_bus_type = {
204 .name = "mmc",
205 .dev_groups = mmc_dev_groups,
206 .match = mmc_bus_match,
207 .uevent = mmc_bus_uevent,
208 .probe = mmc_bus_probe,
209 .remove = mmc_bus_remove,
210 .shutdown = mmc_bus_shutdown,
211 .pm = &mmc_bus_pm_ops,
212 };
213
mmc_register_bus(void)214 int mmc_register_bus(void)
215 {
216 return bus_register(&mmc_bus_type);
217 }
218
mmc_unregister_bus(void)219 void mmc_unregister_bus(void)
220 {
221 bus_unregister(&mmc_bus_type);
222 }
223
224 /**
225 * mmc_register_driver - register a media driver
226 * @drv: MMC media driver
227 */
mmc_register_driver(struct mmc_driver * drv)228 int mmc_register_driver(struct mmc_driver *drv)
229 {
230 drv->drv.bus = &mmc_bus_type;
231 return driver_register(&drv->drv);
232 }
233
234 EXPORT_SYMBOL(mmc_register_driver);
235
236 /**
237 * mmc_unregister_driver - unregister a media driver
238 * @drv: MMC media driver
239 */
mmc_unregister_driver(struct mmc_driver * drv)240 void mmc_unregister_driver(struct mmc_driver *drv)
241 {
242 drv->drv.bus = &mmc_bus_type;
243 driver_unregister(&drv->drv);
244 }
245
246 EXPORT_SYMBOL(mmc_unregister_driver);
247
mmc_release_card(struct device * dev)248 static void mmc_release_card(struct device *dev)
249 {
250 struct mmc_card *card = mmc_dev_to_card(dev);
251
252 sdio_free_common_cis(card);
253
254 kfree(card->info);
255
256 kfree(card);
257 }
258
259 /*
260 * Allocate and initialise a new MMC card structure.
261 */
mmc_alloc_card(struct mmc_host * host,struct device_type * type)262 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
263 {
264 struct mmc_card *card;
265
266 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
267 if (!card)
268 return ERR_PTR(-ENOMEM);
269
270 card->host = host;
271
272 device_initialize(&card->dev);
273
274 card->dev.parent = mmc_classdev(host);
275 card->dev.bus = &mmc_bus_type;
276 card->dev.release = mmc_release_card;
277 card->dev.type = type;
278
279 return card;
280 }
281
282 /*
283 * Register a new MMC card with the driver model.
284 */
mmc_add_card(struct mmc_card * card)285 int mmc_add_card(struct mmc_card *card)
286 {
287 int ret;
288 const char *type;
289 const char *uhs_bus_speed_mode = "";
290 static const char *const uhs_speeds[] = {
291 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
292 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
293 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
294 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
295 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
296 };
297
298
299 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
300
301 switch (card->type) {
302 case MMC_TYPE_MMC:
303 type = "MMC";
304 break;
305 case MMC_TYPE_SD:
306 type = "SD";
307 if (mmc_card_blockaddr(card)) {
308 if (mmc_card_ext_capacity(card))
309 type = "SDXC";
310 else
311 type = "SDHC";
312 }
313 break;
314 case MMC_TYPE_SDIO:
315 type = "SDIO";
316 break;
317 case MMC_TYPE_SD_COMBO:
318 type = "SD-combo";
319 if (mmc_card_blockaddr(card))
320 type = "SDHC-combo";
321 break;
322 default:
323 type = "?";
324 break;
325 }
326
327 if (mmc_card_uhs(card) &&
328 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
329 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
330
331 if (mmc_host_is_spi(card->host)) {
332 pr_info("%s: new %s%s%s card on SPI\n",
333 mmc_hostname(card->host),
334 mmc_card_hs(card) ? "high speed " : "",
335 mmc_card_ddr52(card) ? "DDR " : "",
336 type);
337 } else {
338 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
339 mmc_hostname(card->host),
340 mmc_card_uhs(card) ? "ultra high speed " :
341 (mmc_card_hs(card) ? "high speed " : ""),
342 mmc_card_hs400(card) ? "HS400 " :
343 (mmc_card_hs200(card) ? "HS200 " : ""),
344 mmc_card_ddr52(card) ? "DDR " : "",
345 uhs_bus_speed_mode, type, card->rca);
346 }
347
348 #ifdef CONFIG_DEBUG_FS
349 mmc_add_card_debugfs(card);
350 #endif
351 mmc_init_context_info(card->host);
352
353 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
354
355 ret = device_add(&card->dev);
356 if (ret)
357 return ret;
358
359 mmc_card_set_present(card);
360
361 return 0;
362 }
363
364 /*
365 * Unregister a new MMC card with the driver model, and
366 * (eventually) free it.
367 */
mmc_remove_card(struct mmc_card * card)368 void mmc_remove_card(struct mmc_card *card)
369 {
370 #ifdef CONFIG_DEBUG_FS
371 mmc_remove_card_debugfs(card);
372 #endif
373
374 if (mmc_card_present(card)) {
375 if (mmc_host_is_spi(card->host)) {
376 pr_info("%s: SPI card removed\n",
377 mmc_hostname(card->host));
378 } else {
379 pr_info("%s: card %04x removed\n",
380 mmc_hostname(card->host), card->rca);
381 }
382 device_del(&card->dev);
383 of_node_put(card->dev.of_node);
384 }
385
386 put_device(&card->dev);
387 }
388
389