/* * linux/drivers/mmc/core/sdio_bus.c * * Copyright 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 as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * SDIO function driver model */ #include <linux/device.h> #include <linux/err.h> #include <linux/export.h> #include <linux/slab.h> #include <linux/pm_runtime.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h> #include <linux/mmc/sdio_func.h> #include "sdio_cis.h" #include "sdio_bus.h" #ifdef CONFIG_MMC_EMBEDDED_SDIO #include <linux/mmc/host.h> #endif /* show configuration fields */ #define sdio_config_attr(field, format_string) \ static ssize_t \ field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ { \ struct sdio_func *func; \ \ func = dev_to_sdio_func (dev); \ return sprintf (buf, format_string, func->field); \ } sdio_config_attr(class, "0x%02x\n"); sdio_config_attr(vendor, "0x%04x\n"); sdio_config_attr(device, "0x%04x\n"); static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct sdio_func *func = dev_to_sdio_func (dev); return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device); } static struct device_attribute sdio_dev_attrs[] = { __ATTR_RO(class), __ATTR_RO(vendor), __ATTR_RO(device), __ATTR_RO(modalias), __ATTR_NULL, }; static const struct sdio_device_id *sdio_match_one(struct sdio_func *func, const struct sdio_device_id *id) { if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class) return NULL; if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor) return NULL; if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device) return NULL; return id; } static const struct sdio_device_id *sdio_match_device(struct sdio_func *func, struct sdio_driver *sdrv) { const struct sdio_device_id *ids; ids = sdrv->id_table; if (ids) { while (ids->class || ids->vendor || ids->device) { if (sdio_match_one(func, ids)) return ids; ids++; } } return NULL; } static int sdio_bus_match(struct device *dev, struct device_driver *drv) { struct sdio_func *func = dev_to_sdio_func(dev); struct sdio_driver *sdrv = to_sdio_driver(drv); if (sdio_match_device(func, sdrv)) return 1; return 0; } static int sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env) { struct sdio_func *func = dev_to_sdio_func(dev); if (add_uevent_var(env, "SDIO_CLASS=%02X", func->class)) return -ENOMEM; if (add_uevent_var(env, "SDIO_ID=%04X:%04X", func->vendor, func->device)) return -ENOMEM; if (add_uevent_var(env, "MODALIAS=sdio:c%02Xv%04Xd%04X", func->class, func->vendor, func->device)) return -ENOMEM; return 0; } static int sdio_bus_probe(struct device *dev) { struct sdio_driver *drv = to_sdio_driver(dev->driver); struct sdio_func *func = dev_to_sdio_func(dev); const struct sdio_device_id *id; int ret; id = sdio_match_device(func, drv); if (!id) return -ENODEV; /* Unbound SDIO functions are always suspended. * During probe, the function is set active and the usage count * is incremented. If the driver supports runtime PM, * it should call pm_runtime_put_noidle() in its probe routine and * pm_runtime_get_noresume() in its remove routine. */ if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) { ret = pm_runtime_get_sync(dev); if (ret < 0) goto out; } /* Set the default block size so the driver is sure it's something * sensible. */ sdio_claim_host(func); ret = sdio_set_block_size(func, 0); sdio_release_host(func); if (ret) goto disable_runtimepm; ret = drv->probe(func, id); if (ret) goto disable_runtimepm; return 0; disable_runtimepm: if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) pm_runtime_put_noidle(dev); out: return ret; } static int sdio_bus_remove(struct device *dev) { struct sdio_driver *drv = to_sdio_driver(dev->driver); struct sdio_func *func = dev_to_sdio_func(dev); int ret = 0; /* Make sure card is powered before invoking ->remove() */ if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) pm_runtime_get_sync(dev); drv->remove(func); if (func->irq_handler) { pr_warning("WARNING: driver %s did not remove " "its interrupt handler!\n", drv->name); sdio_claim_host(func); sdio_release_irq(func); sdio_release_host(func); } /* First, undo the increment made directly above */ if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) pm_runtime_put_noidle(dev); /* Then undo the runtime PM settings in sdio_bus_probe() */ if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) pm_runtime_put_sync(dev); return ret; } #ifdef CONFIG_PM_RUNTIME static const struct dev_pm_ops sdio_bus_pm_ops = { SET_RUNTIME_PM_OPS( pm_generic_runtime_suspend, pm_generic_runtime_resume, pm_generic_runtime_idle ) }; #define SDIO_PM_OPS_PTR (&sdio_bus_pm_ops) #else /* !CONFIG_PM_RUNTIME */ #define SDIO_PM_OPS_PTR NULL #endif /* !CONFIG_PM_RUNTIME */ static struct bus_type sdio_bus_type = { .name = "sdio", .dev_attrs = sdio_dev_attrs, .match = sdio_bus_match, .uevent = sdio_bus_uevent, .probe = sdio_bus_probe, .remove = sdio_bus_remove, .pm = SDIO_PM_OPS_PTR, }; int sdio_register_bus(void) { return bus_register(&sdio_bus_type); } void sdio_unregister_bus(void) { bus_unregister(&sdio_bus_type); } /** * sdio_register_driver - register a function driver * @drv: SDIO function driver */ int sdio_register_driver(struct sdio_driver *drv) { drv->drv.name = drv->name; drv->drv.bus = &sdio_bus_type; return driver_register(&drv->drv); } EXPORT_SYMBOL_GPL(sdio_register_driver); /** * sdio_unregister_driver - unregister a function driver * @drv: SDIO function driver */ void sdio_unregister_driver(struct sdio_driver *drv) { drv->drv.bus = &sdio_bus_type; driver_unregister(&drv->drv); } EXPORT_SYMBOL_GPL(sdio_unregister_driver); static void sdio_release_func(struct device *dev) { struct sdio_func *func = dev_to_sdio_func(dev); #ifdef CONFIG_MMC_EMBEDDED_SDIO /* * If this device is embedded then we never allocated * cis tables for this func */ if (!func->card->host->embedded_sdio_data.funcs) #endif sdio_free_func_cis(func); if (func->info) kfree(func->info); kfree(func); } /* * Allocate and initialise a new SDIO function structure. */ struct sdio_func *sdio_alloc_func(struct mmc_card *card) { struct sdio_func *func; func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL); if (!func) return ERR_PTR(-ENOMEM); func->card = card; device_initialize(&func->dev); func->dev.parent = &card->dev; func->dev.bus = &sdio_bus_type; func->dev.release = sdio_release_func; return func; } /* * Register a new SDIO function with the driver model. */ int sdio_add_func(struct sdio_func *func) { int ret; dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num); ret = device_add(&func->dev); if (ret == 0) sdio_func_set_present(func); return ret; } /* * Unregister a SDIO function with the driver model, and * (eventually) free it. * This function can be called through error paths where sdio_add_func() was * never executed (because a failure occurred at an earlier point). */ void sdio_remove_func(struct sdio_func *func) { if (!sdio_func_present(func)) return; device_del(&func->dev); put_device(&func->dev); }