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420 lines
8.8 KiB
420 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/drivers/mmc/core/bus.c |
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* |
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* Copyright (C) 2003 Russell King, All Rights Reserved. |
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* Copyright (C) 2007 Pierre Ossman |
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* |
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* MMC card bus driver model |
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*/ |
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#include <linux/export.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/stat.h> |
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#include <linux/of.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/mmc/card.h> |
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#include <linux/mmc/host.h> |
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#include "core.h" |
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#include "card.h" |
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#include "host.h" |
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#include "sdio_cis.h" |
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#include "bus.h" |
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#define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) |
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static ssize_t type_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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switch (card->type) { |
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case MMC_TYPE_MMC: |
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return sprintf(buf, "MMC\n"); |
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case MMC_TYPE_SD: |
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return sprintf(buf, "SD\n"); |
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case MMC_TYPE_SDIO: |
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return sprintf(buf, "SDIO\n"); |
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case MMC_TYPE_SD_COMBO: |
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return sprintf(buf, "SDcombo\n"); |
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default: |
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return -EFAULT; |
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} |
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} |
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static DEVICE_ATTR_RO(type); |
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static struct attribute *mmc_dev_attrs[] = { |
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&dev_attr_type.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(mmc_dev); |
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/* |
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* This currently matches any MMC driver to any MMC card - drivers |
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* themselves make the decision whether to drive this card in their |
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* probe method. |
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*/ |
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static int mmc_bus_match(struct device *dev, struct device_driver *drv) |
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{ |
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return 1; |
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} |
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static int |
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mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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const char *type; |
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unsigned int i; |
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int retval = 0; |
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switch (card->type) { |
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case MMC_TYPE_MMC: |
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type = "MMC"; |
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break; |
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case MMC_TYPE_SD: |
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type = "SD"; |
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break; |
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case MMC_TYPE_SDIO: |
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type = "SDIO"; |
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break; |
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case MMC_TYPE_SD_COMBO: |
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type = "SDcombo"; |
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break; |
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default: |
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type = NULL; |
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} |
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if (type) { |
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retval = add_uevent_var(env, "MMC_TYPE=%s", type); |
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if (retval) |
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return retval; |
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} |
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if (card->type == MMC_TYPE_SDIO || card->type == MMC_TYPE_SD_COMBO) { |
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retval = add_uevent_var(env, "SDIO_ID=%04X:%04X", |
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card->cis.vendor, card->cis.device); |
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if (retval) |
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return retval; |
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retval = add_uevent_var(env, "SDIO_REVISION=%u.%u", |
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card->major_rev, card->minor_rev); |
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if (retval) |
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return retval; |
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for (i = 0; i < card->num_info; i++) { |
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retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]); |
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if (retval) |
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return retval; |
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} |
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} |
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/* |
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* SDIO (non-combo) cards are not handled by mmc_block driver and do not |
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* have accessible CID register which used by mmc_card_name() function. |
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*/ |
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if (card->type == MMC_TYPE_SDIO) |
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return 0; |
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retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); |
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if (retval) |
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return retval; |
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/* |
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* Request the mmc_block device. Note: that this is a direct request |
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* for the module it carries no information as to what is inserted. |
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*/ |
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retval = add_uevent_var(env, "MODALIAS=mmc:block"); |
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return retval; |
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} |
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static int mmc_bus_probe(struct device *dev) |
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{ |
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struct mmc_driver *drv = to_mmc_driver(dev->driver); |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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return drv->probe(card); |
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} |
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static int mmc_bus_remove(struct device *dev) |
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{ |
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struct mmc_driver *drv = to_mmc_driver(dev->driver); |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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drv->remove(card); |
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return 0; |
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} |
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static void mmc_bus_shutdown(struct device *dev) |
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{ |
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struct mmc_driver *drv = to_mmc_driver(dev->driver); |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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struct mmc_host *host = card->host; |
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int ret; |
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if (dev->driver && drv->shutdown) |
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drv->shutdown(card); |
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if (host->bus_ops->shutdown) { |
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ret = host->bus_ops->shutdown(host); |
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if (ret) |
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pr_warn("%s: error %d during shutdown\n", |
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mmc_hostname(host), ret); |
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} |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int mmc_bus_suspend(struct device *dev) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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struct mmc_host *host = card->host; |
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int ret; |
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ret = pm_generic_suspend(dev); |
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if (ret) |
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return ret; |
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ret = host->bus_ops->suspend(host); |
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if (ret) |
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pm_generic_resume(dev); |
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return ret; |
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} |
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static int mmc_bus_resume(struct device *dev) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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struct mmc_host *host = card->host; |
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int ret; |
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ret = host->bus_ops->resume(host); |
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if (ret) |
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pr_warn("%s: error %d during resume (card was removed?)\n", |
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mmc_hostname(host), ret); |
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ret = pm_generic_resume(dev); |
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return ret; |
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} |
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#endif |
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#ifdef CONFIG_PM |
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static int mmc_runtime_suspend(struct device *dev) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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struct mmc_host *host = card->host; |
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return host->bus_ops->runtime_suspend(host); |
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} |
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static int mmc_runtime_resume(struct device *dev) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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struct mmc_host *host = card->host; |
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return host->bus_ops->runtime_resume(host); |
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} |
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#endif /* !CONFIG_PM */ |
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static const struct dev_pm_ops mmc_bus_pm_ops = { |
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SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL) |
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SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) |
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}; |
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static struct bus_type mmc_bus_type = { |
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.name = "mmc", |
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.dev_groups = mmc_dev_groups, |
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.match = mmc_bus_match, |
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.uevent = mmc_bus_uevent, |
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.probe = mmc_bus_probe, |
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.remove = mmc_bus_remove, |
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.shutdown = mmc_bus_shutdown, |
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.pm = &mmc_bus_pm_ops, |
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}; |
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int mmc_register_bus(void) |
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{ |
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return bus_register(&mmc_bus_type); |
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} |
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void mmc_unregister_bus(void) |
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{ |
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bus_unregister(&mmc_bus_type); |
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} |
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/** |
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* mmc_register_driver - register a media driver |
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* @drv: MMC media driver |
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*/ |
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int mmc_register_driver(struct mmc_driver *drv) |
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{ |
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drv->drv.bus = &mmc_bus_type; |
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return driver_register(&drv->drv); |
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} |
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EXPORT_SYMBOL(mmc_register_driver); |
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/** |
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* mmc_unregister_driver - unregister a media driver |
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* @drv: MMC media driver |
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*/ |
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void mmc_unregister_driver(struct mmc_driver *drv) |
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{ |
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drv->drv.bus = &mmc_bus_type; |
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driver_unregister(&drv->drv); |
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} |
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EXPORT_SYMBOL(mmc_unregister_driver); |
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static void mmc_release_card(struct device *dev) |
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{ |
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struct mmc_card *card = mmc_dev_to_card(dev); |
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sdio_free_common_cis(card); |
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kfree(card->info); |
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kfree(card); |
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} |
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/* |
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* Allocate and initialise a new MMC card structure. |
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*/ |
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struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) |
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{ |
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struct mmc_card *card; |
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card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); |
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if (!card) |
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return ERR_PTR(-ENOMEM); |
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card->host = host; |
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device_initialize(&card->dev); |
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card->dev.parent = mmc_classdev(host); |
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card->dev.bus = &mmc_bus_type; |
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card->dev.release = mmc_release_card; |
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card->dev.type = type; |
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return card; |
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} |
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/* |
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* Register a new MMC card with the driver model. |
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*/ |
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int mmc_add_card(struct mmc_card *card) |
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{ |
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int ret; |
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const char *type; |
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const char *uhs_bus_speed_mode = ""; |
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static const char *const uhs_speeds[] = { |
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[UHS_SDR12_BUS_SPEED] = "SDR12 ", |
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[UHS_SDR25_BUS_SPEED] = "SDR25 ", |
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[UHS_SDR50_BUS_SPEED] = "SDR50 ", |
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[UHS_SDR104_BUS_SPEED] = "SDR104 ", |
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[UHS_DDR50_BUS_SPEED] = "DDR50 ", |
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}; |
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dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); |
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switch (card->type) { |
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case MMC_TYPE_MMC: |
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type = "MMC"; |
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break; |
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case MMC_TYPE_SD: |
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type = "SD"; |
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if (mmc_card_blockaddr(card)) { |
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if (mmc_card_ext_capacity(card)) |
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type = "SDXC"; |
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else |
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type = "SDHC"; |
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} |
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break; |
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case MMC_TYPE_SDIO: |
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type = "SDIO"; |
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break; |
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case MMC_TYPE_SD_COMBO: |
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type = "SD-combo"; |
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if (mmc_card_blockaddr(card)) |
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type = "SDHC-combo"; |
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break; |
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default: |
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type = "?"; |
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break; |
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} |
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if (mmc_card_uhs(card) && |
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(card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) |
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uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; |
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if (mmc_host_is_spi(card->host)) { |
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pr_info("%s: new %s%s%s card on SPI\n", |
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mmc_hostname(card->host), |
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mmc_card_hs(card) ? "high speed " : "", |
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mmc_card_ddr52(card) ? "DDR " : "", |
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type); |
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} else { |
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pr_info("%s: new %s%s%s%s%s%s card at address %04x\n", |
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mmc_hostname(card->host), |
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mmc_card_uhs(card) ? "ultra high speed " : |
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(mmc_card_hs(card) ? "high speed " : ""), |
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mmc_card_hs400(card) ? "HS400 " : |
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(mmc_card_hs200(card) ? "HS200 " : ""), |
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mmc_card_hs400es(card) ? "Enhanced strobe " : "", |
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mmc_card_ddr52(card) ? "DDR " : "", |
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uhs_bus_speed_mode, type, card->rca); |
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} |
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#ifdef CONFIG_DEBUG_FS |
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mmc_add_card_debugfs(card); |
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#endif |
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card->dev.of_node = mmc_of_find_child_device(card->host, 0); |
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device_enable_async_suspend(&card->dev); |
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ret = device_add(&card->dev); |
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if (ret) |
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return ret; |
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mmc_card_set_present(card); |
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return 0; |
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} |
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/* |
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* Unregister a new MMC card with the driver model, and |
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* (eventually) free it. |
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*/ |
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void mmc_remove_card(struct mmc_card *card) |
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{ |
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struct mmc_host *host = card->host; |
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#ifdef CONFIG_DEBUG_FS |
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mmc_remove_card_debugfs(card); |
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#endif |
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if (mmc_card_present(card)) { |
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if (mmc_host_is_spi(card->host)) { |
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pr_info("%s: SPI card removed\n", |
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mmc_hostname(card->host)); |
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} else { |
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pr_info("%s: card %04x removed\n", |
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mmc_hostname(card->host), card->rca); |
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} |
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device_del(&card->dev); |
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of_node_put(card->dev.of_node); |
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} |
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if (host->cqe_enabled) { |
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host->cqe_ops->cqe_disable(host); |
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host->cqe_enabled = false; |
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} |
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put_device(&card->dev); |
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}
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