| /* |
| * linux/drivers/mmc/core/bus.c |
| * |
| * Copyright (C) 2003 Russell King, All Rights Reserved. |
| * Copyright (C) 2007 Pierre Ossman |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * MMC card bus driver model |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/stat.h> |
| #include <linux/pm_runtime.h> |
| |
| #include <linux/mmc/card.h> |
| #include <linux/mmc/host.h> |
| |
| #include "core.h" |
| #include "sdio_cis.h" |
| #include "bus.h" |
| |
| #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) |
| #define RUNTIME_SUSPEND_DELAY_MS 10000 |
| |
| static ssize_t mmc_type_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| switch (card->type) { |
| case MMC_TYPE_MMC: |
| return sprintf(buf, "MMC\n"); |
| case MMC_TYPE_SD: |
| return sprintf(buf, "SD\n"); |
| case MMC_TYPE_SDIO: |
| return sprintf(buf, "SDIO\n"); |
| case MMC_TYPE_SD_COMBO: |
| return sprintf(buf, "SDcombo\n"); |
| default: |
| return -EFAULT; |
| } |
| } |
| |
| static struct device_attribute mmc_dev_attrs[] = { |
| __ATTR(type, S_IRUGO, mmc_type_show, NULL), |
| __ATTR_NULL, |
| }; |
| |
| /* |
| * This currently matches any MMC driver to any MMC card - drivers |
| * themselves make the decision whether to drive this card in their |
| * probe method. |
| */ |
| static int mmc_bus_match(struct device *dev, struct device_driver *drv) |
| { |
| return 1; |
| } |
| |
| static int |
| mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| const char *type; |
| int retval = 0; |
| |
| switch (card->type) { |
| case MMC_TYPE_MMC: |
| type = "MMC"; |
| break; |
| case MMC_TYPE_SD: |
| type = "SD"; |
| break; |
| case MMC_TYPE_SDIO: |
| type = "SDIO"; |
| break; |
| case MMC_TYPE_SD_COMBO: |
| type = "SDcombo"; |
| break; |
| default: |
| type = NULL; |
| } |
| |
| if (type) { |
| retval = add_uevent_var(env, "MMC_TYPE=%s", type); |
| if (retval) |
| return retval; |
| } |
| |
| retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); |
| if (retval) |
| return retval; |
| |
| /* |
| * Request the mmc_block device. Note: that this is a direct request |
| * for the module it carries no information as to what is inserted. |
| */ |
| retval = add_uevent_var(env, "MODALIAS=mmc:block"); |
| |
| return retval; |
| } |
| |
| static int mmc_bus_probe(struct device *dev) |
| { |
| struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| return drv->probe(card); |
| } |
| |
| static int mmc_bus_remove(struct device *dev) |
| { |
| struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| drv->remove(card); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int mmc_bus_suspend(struct device *dev) |
| { |
| struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| int ret = 0; |
| |
| if (dev->driver && drv->suspend) |
| ret = drv->suspend(card); |
| return ret; |
| } |
| |
| static int mmc_bus_resume(struct device *dev) |
| { |
| struct mmc_driver *drv = to_mmc_driver(dev->driver); |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| int ret = 0; |
| |
| if (dev->driver && drv->resume) |
| ret = drv->resume(card); |
| return ret; |
| } |
| #else |
| #define mmc_bus_suspend NULL |
| #define mmc_bus_resume NULL |
| #endif |
| |
| #ifdef CONFIG_PM_RUNTIME |
| |
| static int mmc_runtime_suspend(struct device *dev) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| if (mmc_use_core_runtime_pm(card->host)) |
| return 0; |
| else |
| return mmc_power_save_host(card->host); |
| } |
| |
| static int mmc_runtime_resume(struct device *dev) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| if (mmc_use_core_runtime_pm(card->host)) |
| return 0; |
| else |
| return mmc_power_restore_host(card->host); |
| } |
| |
| static int mmc_runtime_idle(struct device *dev) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| struct mmc_host *host = card->host; |
| int ret = 0; |
| |
| if (mmc_use_core_runtime_pm(card->host)) { |
| ret = pm_schedule_suspend(dev, card->idle_timeout); |
| if (ret) { |
| pr_err("%s: %s: pm_schedule_suspend failed: err: %d\n", |
| mmc_hostname(host), __func__, ret); |
| return ret; |
| } |
| } |
| |
| return ret; |
| } |
| |
| #endif /* !CONFIG_PM_RUNTIME */ |
| |
| static const struct dev_pm_ops mmc_bus_pm_ops = { |
| SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, |
| mmc_runtime_idle) |
| SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) |
| }; |
| |
| static ssize_t show_rpm_delay(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| if (!card) { |
| pr_err("%s: %s: card is NULL\n", dev_name(dev), __func__); |
| return -EINVAL; |
| } |
| |
| return snprintf(buf, PAGE_SIZE, "%u\n", card->idle_timeout); |
| } |
| |
| static ssize_t store_rpm_delay(struct device *dev, struct device_attribute |
| *attr, const char *buf, size_t count) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| unsigned int delay; |
| |
| if (!card) { |
| pr_err("%s: %s: card is NULL\n", dev_name(dev), __func__); |
| return -EINVAL; |
| } |
| |
| if (!kstrtou32(buf, 0, &delay)) { |
| if (delay < 2000) { |
| pr_err("%s: %s: less than 2 sec delay is unsupported\n", |
| mmc_hostname(card->host), __func__); |
| return -EINVAL; |
| } |
| card->idle_timeout = delay; |
| } |
| |
| return count; |
| } |
| |
| static struct bus_type mmc_bus_type = { |
| .name = "mmc", |
| .dev_attrs = mmc_dev_attrs, |
| .match = mmc_bus_match, |
| .uevent = mmc_bus_uevent, |
| .probe = mmc_bus_probe, |
| .remove = mmc_bus_remove, |
| .pm = &mmc_bus_pm_ops, |
| }; |
| |
| int mmc_register_bus(void) |
| { |
| return bus_register(&mmc_bus_type); |
| } |
| |
| void mmc_unregister_bus(void) |
| { |
| bus_unregister(&mmc_bus_type); |
| } |
| |
| /** |
| * mmc_register_driver - register a media driver |
| * @drv: MMC media driver |
| */ |
| int mmc_register_driver(struct mmc_driver *drv) |
| { |
| drv->drv.bus = &mmc_bus_type; |
| return driver_register(&drv->drv); |
| } |
| |
| EXPORT_SYMBOL(mmc_register_driver); |
| |
| /** |
| * mmc_unregister_driver - unregister a media driver |
| * @drv: MMC media driver |
| */ |
| void mmc_unregister_driver(struct mmc_driver *drv) |
| { |
| drv->drv.bus = &mmc_bus_type; |
| driver_unregister(&drv->drv); |
| } |
| |
| EXPORT_SYMBOL(mmc_unregister_driver); |
| |
| static void mmc_release_card(struct device *dev) |
| { |
| struct mmc_card *card = mmc_dev_to_card(dev); |
| |
| sdio_free_common_cis(card); |
| |
| if (card->info) |
| kfree(card->info); |
| |
| kfree(card); |
| } |
| |
| /* |
| * Allocate and initialise a new MMC card structure. |
| */ |
| struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) |
| { |
| struct mmc_card *card; |
| |
| card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); |
| if (!card) |
| return ERR_PTR(-ENOMEM); |
| |
| card->host = host; |
| |
| device_initialize(&card->dev); |
| |
| card->dev.parent = mmc_classdev(host); |
| card->dev.bus = &mmc_bus_type; |
| card->dev.release = mmc_release_card; |
| card->dev.type = type; |
| |
| spin_lock_init(&card->bkops_info.bkops_stats.lock); |
| spin_lock_init(&card->wr_pack_stats.lock); |
| |
| return card; |
| } |
| |
| /* |
| * Register a new MMC card with the driver model. |
| */ |
| int mmc_add_card(struct mmc_card *card) |
| { |
| int ret; |
| const char *type; |
| const char *uhs_bus_speed_mode = ""; |
| static const char *const uhs_speeds[] = { |
| [UHS_SDR12_BUS_SPEED] = "SDR12 ", |
| [UHS_SDR25_BUS_SPEED] = "SDR25 ", |
| [UHS_SDR50_BUS_SPEED] = "SDR50 ", |
| [UHS_SDR104_BUS_SPEED] = "SDR104 ", |
| [UHS_DDR50_BUS_SPEED] = "DDR50 ", |
| }; |
| |
| |
| dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); |
| |
| switch (card->type) { |
| case MMC_TYPE_MMC: |
| type = "MMC"; |
| break; |
| case MMC_TYPE_SD: |
| type = "SD"; |
| if (mmc_card_blockaddr(card)) { |
| if (mmc_card_ext_capacity(card)) |
| type = "SDXC"; |
| else |
| type = "SDHC"; |
| } |
| break; |
| case MMC_TYPE_SDIO: |
| type = "SDIO"; |
| break; |
| case MMC_TYPE_SD_COMBO: |
| type = "SD-combo"; |
| if (mmc_card_blockaddr(card)) |
| type = "SDHC-combo"; |
| break; |
| default: |
| type = "?"; |
| break; |
| } |
| |
| if (mmc_sd_card_uhs(card) && |
| (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) |
| uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; |
| |
| if (mmc_host_is_spi(card->host)) { |
| pr_info("%s: new %s%s%s card on SPI\n", |
| mmc_hostname(card->host), |
| mmc_card_highspeed(card) ? "high speed " : "", |
| mmc_card_ddr_mode(card) ? "DDR " : "", |
| type); |
| } else { |
| pr_info("%s: new %s%s%s%s%s card at address %04x\n", |
| mmc_hostname(card->host), |
| mmc_card_uhs(card) ? "ultra high speed " : |
| (mmc_card_highspeed(card) ? "high speed " : ""), |
| (mmc_card_hs200(card) ? "HS200 " : ""), |
| mmc_card_ddr_mode(card) ? "DDR " : "", |
| uhs_bus_speed_mode, type, card->rca); |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| mmc_add_card_debugfs(card); |
| #endif |
| mmc_init_context_info(card->host); |
| |
| if (mmc_use_core_runtime_pm(card->host)) { |
| ret = pm_runtime_set_active(&card->dev); |
| if (ret) |
| pr_err("%s: %s: failed setting runtime active: ret: %d\n", |
| mmc_hostname(card->host), __func__, ret); |
| else |
| pm_runtime_enable(&card->dev); |
| } |
| |
| ret = device_add(&card->dev); |
| if (ret) |
| return ret; |
| |
| if (mmc_use_core_runtime_pm(card->host)) { |
| card->rpm_attrib.show = show_rpm_delay; |
| card->rpm_attrib.store = store_rpm_delay; |
| sysfs_attr_init(&card->rpm_attrib.attr); |
| card->rpm_attrib.attr.name = "runtime_pm_timeout"; |
| card->rpm_attrib.attr.mode = S_IRUGO | S_IWUSR; |
| |
| ret = device_create_file(&card->dev, &card->rpm_attrib); |
| if (ret) |
| pr_err("%s: %s: creating runtime pm sysfs entry: failed: %d\n", |
| mmc_hostname(card->host), __func__, ret); |
| /* Default timeout is 10 seconds */ |
| card->idle_timeout = RUNTIME_SUSPEND_DELAY_MS; |
| } |
| |
| mmc_card_set_present(card); |
| |
| return 0; |
| } |
| |
| /* |
| * Unregister a new MMC card with the driver model, and |
| * (eventually) free it. |
| */ |
| void mmc_remove_card(struct mmc_card *card) |
| { |
| #ifdef CONFIG_DEBUG_FS |
| mmc_remove_card_debugfs(card); |
| #endif |
| |
| if (mmc_card_present(card)) { |
| if (mmc_host_is_spi(card->host)) { |
| pr_info("%s: SPI card removed\n", |
| mmc_hostname(card->host)); |
| } else { |
| pr_info("%s: card %04x removed\n", |
| mmc_hostname(card->host), card->rca); |
| } |
| device_del(&card->dev); |
| } |
| |
| kfree(card->wr_pack_stats.packing_events); |
| |
| put_device(&card->dev); |
| } |
| |