--- /dev/null
+/*
+ * 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);
+}
+
Code Review / kvmfornfv.git / blobdiff