Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 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 "sysfs.h" |
| 21 | #include "core.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"); |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame^] | 37 | case MMC_TYPE_SDIO: |
| 38 | return sprintf(buf, "SDIO\n"); |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 39 | default: |
| 40 | return -EFAULT; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | static struct device_attribute mmc_dev_attrs[] = { |
| 45 | MMC_ATTR_RO(type), |
| 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, char **envp, int num_envp, char *buf, |
| 61 | int buf_size) |
| 62 | { |
| 63 | struct mmc_card *card = dev_to_mmc_card(dev); |
| 64 | int retval = 0, i = 0, length = 0; |
| 65 | |
| 66 | #define add_env(fmt,val) do { \ |
| 67 | retval = add_uevent_var(envp, num_envp, &i, \ |
| 68 | buf, buf_size, &length, \ |
| 69 | fmt, val); \ |
| 70 | if (retval) \ |
| 71 | return retval; \ |
| 72 | } while (0); |
| 73 | |
| 74 | switch (card->type) { |
| 75 | case MMC_TYPE_MMC: |
| 76 | add_env("MMC_TYPE=%s", "MMC"); |
| 77 | break; |
| 78 | case MMC_TYPE_SD: |
| 79 | add_env("MMC_TYPE=%s", "SD"); |
| 80 | break; |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame^] | 81 | case MMC_TYPE_SDIO: |
| 82 | add_env("MMC_TYPE=%s", "SDIO"); |
| 83 | break; |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | add_env("MMC_NAME=%s", mmc_card_name(card)); |
| 87 | |
| 88 | #undef add_env |
| 89 | |
| 90 | envp[i] = NULL; |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int mmc_bus_probe(struct device *dev) |
| 96 | { |
| 97 | struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| 98 | struct mmc_card *card = dev_to_mmc_card(dev); |
| 99 | |
| 100 | return drv->probe(card); |
| 101 | } |
| 102 | |
| 103 | static int mmc_bus_remove(struct device *dev) |
| 104 | { |
| 105 | struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| 106 | struct mmc_card *card = dev_to_mmc_card(dev); |
| 107 | |
| 108 | drv->remove(card); |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static int mmc_bus_suspend(struct device *dev, pm_message_t state) |
| 114 | { |
| 115 | struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| 116 | struct mmc_card *card = dev_to_mmc_card(dev); |
| 117 | int ret = 0; |
| 118 | |
| 119 | if (dev->driver && drv->suspend) |
| 120 | ret = drv->suspend(card, state); |
| 121 | return ret; |
| 122 | } |
| 123 | |
| 124 | static int mmc_bus_resume(struct device *dev) |
| 125 | { |
| 126 | struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| 127 | struct mmc_card *card = dev_to_mmc_card(dev); |
| 128 | int ret = 0; |
| 129 | |
| 130 | if (dev->driver && drv->resume) |
| 131 | ret = drv->resume(card); |
| 132 | return ret; |
| 133 | } |
| 134 | |
| 135 | static struct bus_type mmc_bus_type = { |
| 136 | .name = "mmc", |
| 137 | .dev_attrs = mmc_dev_attrs, |
| 138 | .match = mmc_bus_match, |
| 139 | .uevent = mmc_bus_uevent, |
| 140 | .probe = mmc_bus_probe, |
| 141 | .remove = mmc_bus_remove, |
| 142 | .suspend = mmc_bus_suspend, |
| 143 | .resume = mmc_bus_resume, |
| 144 | }; |
| 145 | |
| 146 | int mmc_register_bus(void) |
| 147 | { |
| 148 | return bus_register(&mmc_bus_type); |
| 149 | } |
| 150 | |
| 151 | void mmc_unregister_bus(void) |
| 152 | { |
| 153 | bus_unregister(&mmc_bus_type); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * mmc_register_driver - register a media driver |
| 158 | * @drv: MMC media driver |
| 159 | */ |
| 160 | int mmc_register_driver(struct mmc_driver *drv) |
| 161 | { |
| 162 | drv->drv.bus = &mmc_bus_type; |
| 163 | return driver_register(&drv->drv); |
| 164 | } |
| 165 | |
| 166 | EXPORT_SYMBOL(mmc_register_driver); |
| 167 | |
| 168 | /** |
| 169 | * mmc_unregister_driver - unregister a media driver |
| 170 | * @drv: MMC media driver |
| 171 | */ |
| 172 | void mmc_unregister_driver(struct mmc_driver *drv) |
| 173 | { |
| 174 | drv->drv.bus = &mmc_bus_type; |
| 175 | driver_unregister(&drv->drv); |
| 176 | } |
| 177 | |
| 178 | EXPORT_SYMBOL(mmc_unregister_driver); |
| 179 | |
| 180 | static void mmc_release_card(struct device *dev) |
| 181 | { |
| 182 | struct mmc_card *card = dev_to_mmc_card(dev); |
| 183 | |
| 184 | kfree(card); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * Allocate and initialise a new MMC card structure. |
| 189 | */ |
| 190 | struct mmc_card *mmc_alloc_card(struct mmc_host *host) |
| 191 | { |
| 192 | struct mmc_card *card; |
| 193 | |
Mariusz Kozlowski | 733cb1e | 2007-08-10 14:00:47 -0700 | [diff] [blame] | 194 | card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 195 | if (!card) |
| 196 | return ERR_PTR(-ENOMEM); |
| 197 | |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 198 | card->host = host; |
| 199 | |
| 200 | device_initialize(&card->dev); |
| 201 | |
| 202 | card->dev.parent = mmc_classdev(host); |
| 203 | card->dev.bus = &mmc_bus_type; |
| 204 | card->dev.release = mmc_release_card; |
| 205 | |
| 206 | return card; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Register a new MMC card with the driver model. |
| 211 | */ |
| 212 | int mmc_add_card(struct mmc_card *card) |
| 213 | { |
| 214 | int ret; |
Pierre Ossman | 109b5be | 2007-07-23 00:12:10 +0200 | [diff] [blame] | 215 | const char *type; |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 216 | |
| 217 | snprintf(card->dev.bus_id, sizeof(card->dev.bus_id), |
| 218 | "%s:%04x", mmc_hostname(card->host), card->rca); |
| 219 | |
Pierre Ossman | 109b5be | 2007-07-23 00:12:10 +0200 | [diff] [blame] | 220 | switch (card->type) { |
| 221 | case MMC_TYPE_MMC: |
| 222 | type = "MMC"; |
| 223 | break; |
| 224 | case MMC_TYPE_SD: |
| 225 | type = "SD"; |
| 226 | if (mmc_card_blockaddr(card)) |
| 227 | type = "SDHC"; |
| 228 | break; |
Pierre Ossman | 5c4e6f1 | 2007-05-21 20:23:20 +0200 | [diff] [blame^] | 229 | case MMC_TYPE_SDIO: |
| 230 | type = "SDIO"; |
| 231 | break; |
Pierre Ossman | 109b5be | 2007-07-23 00:12:10 +0200 | [diff] [blame] | 232 | default: |
| 233 | type = "?"; |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | printk(KERN_INFO "%s: new %s%s card at address %04x\n", |
| 238 | mmc_hostname(card->host), |
| 239 | mmc_card_highspeed(card) ? "high speed " : "", |
| 240 | type, card->rca); |
| 241 | |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 242 | card->dev.uevent_suppress = 1; |
| 243 | |
| 244 | ret = device_add(&card->dev); |
| 245 | if (ret) |
| 246 | return ret; |
| 247 | |
| 248 | if (card->host->bus_ops->sysfs_add) { |
| 249 | ret = card->host->bus_ops->sysfs_add(card->host, card); |
| 250 | if (ret) { |
| 251 | device_del(&card->dev); |
| 252 | return ret; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | card->dev.uevent_suppress = 0; |
| 257 | |
| 258 | kobject_uevent(&card->dev.kobj, KOBJ_ADD); |
| 259 | |
| 260 | mmc_card_set_present(card); |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Unregister a new MMC card with the driver model, and |
| 267 | * (eventually) free it. |
| 268 | */ |
| 269 | void mmc_remove_card(struct mmc_card *card) |
| 270 | { |
| 271 | if (mmc_card_present(card)) { |
Pierre Ossman | 109b5be | 2007-07-23 00:12:10 +0200 | [diff] [blame] | 272 | printk(KERN_INFO "%s: card %04x removed\n", |
| 273 | mmc_hostname(card->host), card->rca); |
| 274 | |
Pierre Ossman | 4101c16 | 2007-05-19 13:39:01 +0200 | [diff] [blame] | 275 | if (card->host->bus_ops->sysfs_remove) |
| 276 | card->host->bus_ops->sysfs_remove(card->host, card); |
| 277 | device_del(&card->dev); |
| 278 | } |
| 279 | |
| 280 | put_device(&card->dev); |
| 281 | } |
| 282 | |