diff options
Diffstat (limited to 'kernel/drivers/mmc/core/sdio_bus.c')
-rw-r--r-- | kernel/drivers/mmc/core/sdio_bus.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/kernel/drivers/mmc/core/sdio_bus.c b/kernel/drivers/mmc/core/sdio_bus.c new file mode 100644 index 000000000..bee02e644 --- /dev/null +++ b/kernel/drivers/mmc/core/sdio_bus.c @@ -0,0 +1,343 @@ +/* + * 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/pm_domain.h> +#include <linux/acpi.h> + +#include <linux/mmc/card.h> +#include <linux/mmc/host.h> +#include <linux/mmc/sdio_func.h> +#include <linux/of.h> + +#include "core.h" +#include "sdio_cis.h" +#include "sdio_bus.h" + +#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv) + +/* 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); \ +} \ +static DEVICE_ATTR_RO(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 DEVICE_ATTR_RO(modalias); + +static struct attribute *sdio_dev_attrs[] = { + &dev_attr_class.attr, + &dev_attr_vendor.attr, + &dev_attr_device.attr, + &dev_attr_modalias.attr, + NULL, +}; +ATTRIBUTE_GROUPS(sdio_dev); + +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 disable_runtimepm; + } + + /* 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); + 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_warn("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; +} + +static const struct dev_pm_ops sdio_bus_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume) + SET_RUNTIME_PM_OPS( + pm_generic_runtime_suspend, + pm_generic_runtime_resume, + NULL + ) +}; + +static struct bus_type sdio_bus_type = { + .name = "sdio", + .dev_groups = sdio_dev_groups, + .match = sdio_bus_match, + .uevent = sdio_bus_uevent, + .probe = sdio_bus_probe, + .remove = sdio_bus_remove, + .pm = &sdio_bus_pm_ops, +}; + +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); + + sdio_free_func_cis(func); + + 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; +} + +#ifdef CONFIG_ACPI +static void sdio_acpi_set_handle(struct sdio_func *func) +{ + struct mmc_host *host = func->card->host; + u64 addr = ((u64)host->slotno << 16) | func->num; + + acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr); +} +#else +static inline void sdio_acpi_set_handle(struct sdio_func *func) {} +#endif + +static void sdio_set_of_node(struct sdio_func *func) +{ + struct mmc_host *host = func->card->host; + + func->dev.of_node = mmc_of_find_child_device(host, func->num); +} + +/* + * 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); + + sdio_set_of_node(func); + sdio_acpi_set_handle(func); + ret = device_add(&func->dev); + if (ret == 0) { + sdio_func_set_present(func); + dev_pm_domain_attach(&func->dev, false); + } + + 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; + + dev_pm_domain_detach(&func->dev, false); + device_del(&func->dev); + of_node_put(func->dev.of_node); + put_device(&func->dev); +} + |