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 #include <linux/slab.h> 17 18 #include <linux/mmc/card.h> 19 #include <linux/mmc/host.h> 20 21 #include "core.h" 22 #include "sdio_cis.h" 23 #include "bus.h" 24 25 #define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev) 26 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) 27 28 static ssize_t mmc_type_show(struct device *dev, 29 struct device_attribute *attr, char *buf) 30 { 31 struct mmc_card *card = dev_to_mmc_card(dev); 32 33 switch (card->type) { 34 case MMC_TYPE_MMC: 35 return sprintf(buf, "MMC\n"); 36 case MMC_TYPE_SD: 37 return sprintf(buf, "SD\n"); 38 case MMC_TYPE_SDIO: 39 return sprintf(buf, "SDIO\n"); 40 default: 41 return -EFAULT; 42 } 43 } 44 45 static struct device_attribute mmc_dev_attrs[] = { 46 __ATTR(type, S_IRUGO, mmc_type_show, NULL), 47 __ATTR_NULL, 48 }; 49 50 /* 51 * This currently matches any MMC driver to any MMC card - drivers 52 * themselves make the decision whether to drive this card in their 53 * probe method. 54 */ 55 static int mmc_bus_match(struct device *dev, struct device_driver *drv) 56 { 57 return 1; 58 } 59 60 static int 61 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 62 { 63 struct mmc_card *card = dev_to_mmc_card(dev); 64 const char *type; 65 int retval = 0; 66 67 switch (card->type) { 68 case MMC_TYPE_MMC: 69 type = "MMC"; 70 break; 71 case MMC_TYPE_SD: 72 type = "SD"; 73 break; 74 case MMC_TYPE_SDIO: 75 type = "SDIO"; 76 break; 77 default: 78 type = NULL; 79 } 80 81 if (type) { 82 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 83 if (retval) 84 return retval; 85 } 86 87 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 88 if (retval) 89 return retval; 90 91 /* 92 * Request the mmc_block device. Note: that this is a direct request 93 * for the module it carries no information as to what is inserted. 94 */ 95 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 96 97 return retval; 98 } 99 100 static int mmc_bus_probe(struct device *dev) 101 { 102 struct mmc_driver *drv = to_mmc_driver(dev->driver); 103 struct mmc_card *card = dev_to_mmc_card(dev); 104 105 return drv->probe(card); 106 } 107 108 static int mmc_bus_remove(struct device *dev) 109 { 110 struct mmc_driver *drv = to_mmc_driver(dev->driver); 111 struct mmc_card *card = dev_to_mmc_card(dev); 112 113 drv->remove(card); 114 115 return 0; 116 } 117 118 static int mmc_bus_suspend(struct device *dev, pm_message_t state) 119 { 120 struct mmc_driver *drv = to_mmc_driver(dev->driver); 121 struct mmc_card *card = dev_to_mmc_card(dev); 122 int ret = 0; 123 124 if (dev->driver && drv->suspend) 125 ret = drv->suspend(card, state); 126 return ret; 127 } 128 129 static int mmc_bus_resume(struct device *dev) 130 { 131 struct mmc_driver *drv = to_mmc_driver(dev->driver); 132 struct mmc_card *card = dev_to_mmc_card(dev); 133 int ret = 0; 134 135 if (dev->driver && drv->resume) 136 ret = drv->resume(card); 137 return ret; 138 } 139 140 static struct bus_type mmc_bus_type = { 141 .name = "mmc", 142 .dev_attrs = mmc_dev_attrs, 143 .match = mmc_bus_match, 144 .uevent = mmc_bus_uevent, 145 .probe = mmc_bus_probe, 146 .remove = mmc_bus_remove, 147 .suspend = mmc_bus_suspend, 148 .resume = mmc_bus_resume, 149 }; 150 151 int mmc_register_bus(void) 152 { 153 return bus_register(&mmc_bus_type); 154 } 155 156 void mmc_unregister_bus(void) 157 { 158 bus_unregister(&mmc_bus_type); 159 } 160 161 /** 162 * mmc_register_driver - register a media driver 163 * @drv: MMC media driver 164 */ 165 int mmc_register_driver(struct mmc_driver *drv) 166 { 167 drv->drv.bus = &mmc_bus_type; 168 return driver_register(&drv->drv); 169 } 170 171 EXPORT_SYMBOL(mmc_register_driver); 172 173 /** 174 * mmc_unregister_driver - unregister a media driver 175 * @drv: MMC media driver 176 */ 177 void mmc_unregister_driver(struct mmc_driver *drv) 178 { 179 drv->drv.bus = &mmc_bus_type; 180 driver_unregister(&drv->drv); 181 } 182 183 EXPORT_SYMBOL(mmc_unregister_driver); 184 185 static void mmc_release_card(struct device *dev) 186 { 187 struct mmc_card *card = dev_to_mmc_card(dev); 188 189 sdio_free_common_cis(card); 190 191 if (card->info) 192 kfree(card->info); 193 194 kfree(card); 195 } 196 197 /* 198 * Allocate and initialise a new MMC card structure. 199 */ 200 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 201 { 202 struct mmc_card *card; 203 204 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 205 if (!card) 206 return ERR_PTR(-ENOMEM); 207 208 card->host = host; 209 210 device_initialize(&card->dev); 211 212 card->dev.parent = mmc_classdev(host); 213 card->dev.bus = &mmc_bus_type; 214 card->dev.release = mmc_release_card; 215 card->dev.type = type; 216 217 return card; 218 } 219 220 /* 221 * Register a new MMC card with the driver model. 222 */ 223 int mmc_add_card(struct mmc_card *card) 224 { 225 int ret; 226 const char *type; 227 228 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 229 230 switch (card->type) { 231 case MMC_TYPE_MMC: 232 type = "MMC"; 233 break; 234 case MMC_TYPE_SD: 235 type = "SD"; 236 if (mmc_card_blockaddr(card)) 237 type = "SDHC"; 238 break; 239 case MMC_TYPE_SDIO: 240 type = "SDIO"; 241 break; 242 default: 243 type = "?"; 244 break; 245 } 246 247 if (mmc_host_is_spi(card->host)) { 248 printk(KERN_INFO "%s: new %s%s card on SPI\n", 249 mmc_hostname(card->host), 250 mmc_card_highspeed(card) ? "high speed " : "", 251 type); 252 } else { 253 printk(KERN_INFO "%s: new %s%s card at address %04x\n", 254 mmc_hostname(card->host), 255 mmc_card_highspeed(card) ? "high speed " : "", 256 type, card->rca); 257 } 258 259 ret = device_add(&card->dev); 260 if (ret) 261 return ret; 262 263 #ifdef CONFIG_DEBUG_FS 264 mmc_add_card_debugfs(card); 265 #endif 266 267 mmc_card_set_present(card); 268 269 return 0; 270 } 271 272 /* 273 * Unregister a new MMC card with the driver model, and 274 * (eventually) free it. 275 */ 276 void mmc_remove_card(struct mmc_card *card) 277 { 278 #ifdef CONFIG_DEBUG_FS 279 mmc_remove_card_debugfs(card); 280 #endif 281 282 if (mmc_card_present(card)) { 283 if (mmc_host_is_spi(card->host)) { 284 printk(KERN_INFO "%s: SPI card removed\n", 285 mmc_hostname(card->host)); 286 } else { 287 printk(KERN_INFO "%s: card %04x removed\n", 288 mmc_hostname(card->host), card->rca); 289 } 290 device_del(&card->dev); 291 } 292 293 put_device(&card->dev); 294 } 295 296