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misc: pvpanic: Combine ACPI and platform drivers

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There is nothing special in the driver that requires to have
a special ACPI driver for it. Combine both into simple
platform driver.

Cc: Peng Hao <peng.hao2@zte.com.cn>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20201209203642.27648-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2020-12-09 22:36:41 +02:00 committed by Greg Kroah-Hartman
parent ebee0cde19
commit f104060813
1 changed files with 17 additions and 113 deletions
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130
drivers/misc/pvpanic.c
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@ -8,7 +8,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/module.h>
@ -49,101 +49,16 @@ static struct notifier_block pvpanic_panic_nb = {
.priority = 1, /* let this called before broken drm_fb_helper */
};
#ifdef CONFIG_ACPI
static int pvpanic_add(struct acpi_device *device);
static int pvpanic_remove(struct acpi_device *device);
static const struct acpi_device_id pvpanic_device_ids[] = {
{ "QEMU0001", 0 },
{ "", 0 }
};
MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
static struct acpi_driver pvpanic_driver = {
.name = "pvpanic",
.class = "QEMU",
.ids = pvpanic_device_ids,
.ops = {
.add = pvpanic_add,
.remove = pvpanic_remove,
},
.owner = THIS_MODULE,
};
static acpi_status
pvpanic_walk_resources(struct acpi_resource *res, void *context)
{
struct resource r;
if (acpi_dev_resource_io(res, &r)) {
#ifdef CONFIG_HAS_IOPORT_MAP
base = ioport_map(r.start, resource_size(&r));
return AE_OK;
#else
return AE_ERROR;
#endif
} else if (acpi_dev_resource_memory(res, &r)) {
base = ioremap(r.start, resource_size(&r));
return AE_OK;
}
return AE_ERROR;
}
static int pvpanic_add(struct acpi_device *device)
{
int ret;
ret = acpi_bus_get_status(device);
if (ret < 0)
return ret;
if (!device->status.enabled || !device->status.functional)
return -ENODEV;
acpi_walk_resources(device->handle, METHOD_NAME__CRS,
pvpanic_walk_resources, NULL);
if (!base)
return -ENODEV;
atomic_notifier_chain_register(&panic_notifier_list,
&pvpanic_panic_nb);
return 0;
}
static int pvpanic_remove(struct acpi_device *device)
{
atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
iounmap(base);
return 0;
}
static int pvpanic_register_acpi_driver(void)
{
return acpi_bus_register_driver(&pvpanic_driver);
}
static void pvpanic_unregister_acpi_driver(void)
{
acpi_bus_unregister_driver(&pvpanic_driver);
}
#else
static int pvpanic_register_acpi_driver(void)
{
return -ENODEV;
}
static void pvpanic_unregister_acpi_driver(void) {}
#endif
static int pvpanic_mmio_probe(struct platform_device *pdev)
{
base = devm_platform_ioremap_resource(pdev, 0);
struct device *dev = &pdev->dev;
struct resource *res;
res = platform_get_mem_or_io(pdev, 0);
if (res && resource_type(res) == IORESOURCE_IO)
base = devm_ioport_map(dev, res->start, resource_size(res));
else
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
@ -167,30 +82,19 @@ static const struct of_device_id pvpanic_mmio_match[] = {
{}
};
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,
};
static int __init pvpanic_mmio_init(void)
{
if (acpi_disabled)
return platform_driver_register(&pvpanic_mmio_driver);
else
return pvpanic_register_acpi_driver();
}
static void __exit pvpanic_mmio_exit(void)
{
if (acpi_disabled)
platform_driver_unregister(&pvpanic_mmio_driver);
else
pvpanic_unregister_acpi_driver();
}
module_init(pvpanic_mmio_init);
module_exit(pvpanic_mmio_exit);
module_platform_driver(pvpanic_mmio_driver);