![Ulf Hansson](/assets/img/avatar_default.png)
Other subsystem buses attach PM domains during probe, but prior calling the driver's ->probe() method. During the removal phase, detaching the PM domain will be done after invoking the driver's ->remove() callback. Convert the SDIO bus to follow this behavior and add error handling. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
348 lines
8 KiB
C
348 lines
8 KiB
C
/*
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* linux/drivers/mmc/core/sdio_bus.c
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*
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* Copyright 2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* SDIO function driver model
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_domain.h>
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#include <linux/acpi.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/sdio_func.h>
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#include <linux/of.h>
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#include "core.h"
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#include "sdio_cis.h"
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#include "sdio_bus.h"
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#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
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/* show configuration fields */
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#define sdio_config_attr(field, format_string) \
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static ssize_t \
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field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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struct sdio_func *func; \
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\
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func = dev_to_sdio_func (dev); \
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return sprintf (buf, format_string, func->field); \
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} \
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static DEVICE_ATTR_RO(field)
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sdio_config_attr(class, "0x%02x\n");
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sdio_config_attr(vendor, "0x%04x\n");
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sdio_config_attr(device, "0x%04x\n");
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct sdio_func *func = dev_to_sdio_func (dev);
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return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
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func->class, func->vendor, func->device);
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}
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *sdio_dev_attrs[] = {
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&dev_attr_class.attr,
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&dev_attr_vendor.attr,
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&dev_attr_device.attr,
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(sdio_dev);
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static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
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const struct sdio_device_id *id)
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{
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if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
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return NULL;
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if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
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return NULL;
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if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
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return NULL;
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return id;
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}
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static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
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struct sdio_driver *sdrv)
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{
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const struct sdio_device_id *ids;
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ids = sdrv->id_table;
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if (ids) {
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while (ids->class || ids->vendor || ids->device) {
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if (sdio_match_one(func, ids))
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return ids;
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ids++;
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}
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}
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return NULL;
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}
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static int sdio_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct sdio_func *func = dev_to_sdio_func(dev);
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struct sdio_driver *sdrv = to_sdio_driver(drv);
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if (sdio_match_device(func, sdrv))
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return 1;
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return 0;
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}
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static int
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sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct sdio_func *func = dev_to_sdio_func(dev);
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if (add_uevent_var(env,
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"SDIO_CLASS=%02X", func->class))
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return -ENOMEM;
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if (add_uevent_var(env,
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"SDIO_ID=%04X:%04X", func->vendor, func->device))
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return -ENOMEM;
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if (add_uevent_var(env,
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"MODALIAS=sdio:c%02Xv%04Xd%04X",
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func->class, func->vendor, func->device))
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return -ENOMEM;
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return 0;
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}
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static int sdio_bus_probe(struct device *dev)
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{
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struct sdio_driver *drv = to_sdio_driver(dev->driver);
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struct sdio_func *func = dev_to_sdio_func(dev);
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const struct sdio_device_id *id;
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int ret;
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id = sdio_match_device(func, drv);
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if (!id)
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return -ENODEV;
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ret = dev_pm_domain_attach(dev, false);
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if (ret == -EPROBE_DEFER)
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return ret;
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/* Unbound SDIO functions are always suspended.
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* During probe, the function is set active and the usage count
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* is incremented. If the driver supports runtime PM,
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* it should call pm_runtime_put_noidle() in its probe routine and
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* pm_runtime_get_noresume() in its remove routine.
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*/
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if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
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ret = pm_runtime_get_sync(dev);
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if (ret < 0)
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goto disable_runtimepm;
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}
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/* Set the default block size so the driver is sure it's something
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* sensible. */
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sdio_claim_host(func);
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ret = sdio_set_block_size(func, 0);
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sdio_release_host(func);
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if (ret)
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goto disable_runtimepm;
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ret = drv->probe(func, id);
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if (ret)
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goto disable_runtimepm;
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return 0;
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disable_runtimepm:
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if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
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pm_runtime_put_noidle(dev);
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dev_pm_domain_detach(dev, false);
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return ret;
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}
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static int sdio_bus_remove(struct device *dev)
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{
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struct sdio_driver *drv = to_sdio_driver(dev->driver);
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struct sdio_func *func = dev_to_sdio_func(dev);
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int ret = 0;
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/* Make sure card is powered before invoking ->remove() */
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if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
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pm_runtime_get_sync(dev);
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drv->remove(func);
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if (func->irq_handler) {
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pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
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drv->name);
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sdio_claim_host(func);
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sdio_release_irq(func);
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sdio_release_host(func);
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}
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/* First, undo the increment made directly above */
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if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
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pm_runtime_put_noidle(dev);
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/* Then undo the runtime PM settings in sdio_bus_probe() */
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if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
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pm_runtime_put_sync(dev);
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dev_pm_domain_detach(dev, false);
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return ret;
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}
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static const struct dev_pm_ops sdio_bus_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
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SET_RUNTIME_PM_OPS(
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pm_generic_runtime_suspend,
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pm_generic_runtime_resume,
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NULL
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)
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};
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static struct bus_type sdio_bus_type = {
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.name = "sdio",
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.dev_groups = sdio_dev_groups,
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.match = sdio_bus_match,
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.uevent = sdio_bus_uevent,
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.probe = sdio_bus_probe,
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.remove = sdio_bus_remove,
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.pm = &sdio_bus_pm_ops,
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};
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int sdio_register_bus(void)
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{
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return bus_register(&sdio_bus_type);
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}
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void sdio_unregister_bus(void)
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{
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bus_unregister(&sdio_bus_type);
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}
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/**
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* sdio_register_driver - register a function driver
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* @drv: SDIO function driver
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*/
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int sdio_register_driver(struct sdio_driver *drv)
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{
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drv->drv.name = drv->name;
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drv->drv.bus = &sdio_bus_type;
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return driver_register(&drv->drv);
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}
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EXPORT_SYMBOL_GPL(sdio_register_driver);
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/**
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* sdio_unregister_driver - unregister a function driver
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* @drv: SDIO function driver
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*/
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void sdio_unregister_driver(struct sdio_driver *drv)
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{
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drv->drv.bus = &sdio_bus_type;
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driver_unregister(&drv->drv);
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}
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EXPORT_SYMBOL_GPL(sdio_unregister_driver);
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static void sdio_release_func(struct device *dev)
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{
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struct sdio_func *func = dev_to_sdio_func(dev);
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sdio_free_func_cis(func);
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kfree(func->info);
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kfree(func);
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}
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/*
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* Allocate and initialise a new SDIO function structure.
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*/
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struct sdio_func *sdio_alloc_func(struct mmc_card *card)
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{
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struct sdio_func *func;
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func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
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if (!func)
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return ERR_PTR(-ENOMEM);
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func->card = card;
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device_initialize(&func->dev);
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func->dev.parent = &card->dev;
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func->dev.bus = &sdio_bus_type;
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func->dev.release = sdio_release_func;
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return func;
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}
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#ifdef CONFIG_ACPI
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static void sdio_acpi_set_handle(struct sdio_func *func)
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{
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struct mmc_host *host = func->card->host;
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u64 addr = ((u64)host->slotno << 16) | func->num;
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acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
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}
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#else
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static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
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#endif
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static void sdio_set_of_node(struct sdio_func *func)
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{
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struct mmc_host *host = func->card->host;
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func->dev.of_node = mmc_of_find_child_device(host, func->num);
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}
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/*
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* Register a new SDIO function with the driver model.
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*/
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int sdio_add_func(struct sdio_func *func)
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{
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int ret;
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dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
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sdio_set_of_node(func);
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sdio_acpi_set_handle(func);
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ret = device_add(&func->dev);
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if (ret == 0)
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sdio_func_set_present(func);
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return ret;
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}
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/*
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* Unregister a SDIO function with the driver model, and
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* (eventually) free it.
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* This function can be called through error paths where sdio_add_func() was
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* never executed (because a failure occurred at an earlier point).
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*/
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void sdio_remove_func(struct sdio_func *func)
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{
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if (!sdio_func_present(func))
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return;
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device_del(&func->dev);
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of_node_put(func->dev.of_node);
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put_device(&func->dev);
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}
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