mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 13:41:55 +00:00
afded6d83a
Inconveniently devm_ioport_map() and devm_ioremap_resource()
return errors differently, i.e. former uses simply NULL pointer,
while the latter an error pointer.
Due to this, we have to check each of them separately.
Fixes: f104060813 ("misc: pvpanic: Combine ACPI and platform drivers")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20201228184313.57610-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Pvpanic Device Support
|
|
*
|
|
* Copyright (C) 2013 Fujitsu.
|
|
* Copyright (C) 2018 ZTE.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <uapi/misc/pvpanic.h>
|
|
|
|
static void __iomem *base;
|
|
|
|
MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
|
|
MODULE_DESCRIPTION("pvpanic device driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static void
|
|
pvpanic_send_event(unsigned int event)
|
|
{
|
|
iowrite8(event, base);
|
|
}
|
|
|
|
static int
|
|
pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
|
|
void *unused)
|
|
{
|
|
unsigned int event = PVPANIC_PANICKED;
|
|
|
|
if (kexec_crash_loaded())
|
|
event = PVPANIC_CRASH_LOADED;
|
|
|
|
pvpanic_send_event(event);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block pvpanic_panic_nb = {
|
|
.notifier_call = pvpanic_panic_notify,
|
|
.priority = 1, /* let this called before broken drm_fb_helper */
|
|
};
|
|
|
|
static int pvpanic_mmio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *res;
|
|
|
|
res = platform_get_mem_or_io(pdev, 0);
|
|
if (!res)
|
|
return -EINVAL;
|
|
|
|
switch (resource_type(res)) {
|
|
case IORESOURCE_IO:
|
|
base = devm_ioport_map(dev, res->start, resource_size(res));
|
|
if (!base)
|
|
return -ENOMEM;
|
|
break;
|
|
case IORESOURCE_MEM:
|
|
base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&pvpanic_panic_nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pvpanic_mmio_remove(struct platform_device *pdev)
|
|
{
|
|
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
|
&pvpanic_panic_nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id pvpanic_mmio_match[] = {
|
|
{ .compatible = "qemu,pvpanic-mmio", },
|
|
{}
|
|
};
|
|
|
|
static const struct acpi_device_id pvpanic_device_ids[] = {
|
|
{ "QEMU0001", 0 },
|
|
{ "", 0 }
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
|
|
|
|
static struct platform_driver pvpanic_mmio_driver = {
|
|
.driver = {
|
|
.name = "pvpanic-mmio",
|
|
.of_match_table = pvpanic_mmio_match,
|
|
.acpi_match_table = pvpanic_device_ids,
|
|
},
|
|
.probe = pvpanic_mmio_probe,
|
|
.remove = pvpanic_mmio_remove,
|
|
};
|
|
module_platform_driver(pvpanic_mmio_driver);
|