drivers/char/ipmi/ipmi_si_platform.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * ipmi_si_platform.c
  *
  * Handling for platform devices in IPMI (ACPI, OF, and things
  * coming from the platform.
  */

 #define pr_fmt(fmt) "ipmi_platform: " fmt
 #define dev_fmt pr_fmt

 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/acpi.h>
 #include "ipmi_si.h"
 #include "ipmi_dmi.h"

 static bool platform_registered;
 static bool si_tryplatform = true;
 #ifdef CONFIG_ACPI
 static bool          si_tryacpi = true;
 #endif
 #ifdef CONFIG_OF
 static bool          si_tryopenfirmware = true;
 #endif
 #ifdef CONFIG_DMI
 static bool          si_trydmi = true;
 #else
 static bool          si_trydmi = false;
 #endif

 module_param_named(tryplatform, si_tryplatform, bool, 0);
 MODULE_PARM_DESC(tryplatform, "Setting this to zero will disable the"
 		 " default scan of the interfaces identified via platform"
 		 " interfaces besides ACPI, OpenFirmware, and DMI");
 #ifdef CONFIG_ACPI
 module_param_named(tryacpi, si_tryacpi, bool, 0);
 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
 		 " default scan of the interfaces identified via ACPI");
 #endif
 #ifdef CONFIG_OF
 module_param_named(tryopenfirmware, si_tryopenfirmware, bool, 0);
 MODULE_PARM_DESC(tryopenfirmware, "Setting this to zero will disable the"
 		 " default scan of the interfaces identified via OpenFirmware");
 #endif
 #ifdef CONFIG_DMI
 module_param_named(trydmi, si_trydmi, bool, 0);
 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
 		 " default scan of the interfaces identified via DMI");
 #endif

 #ifdef CONFIG_ACPI
 /* For GPE-type interrupts. */
 static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
 	u32 gpe_number, void *context)
 {
 	struct si_sm_io *io = context;

 	ipmi_si_irq_handler(io->irq, io->irq_handler_data);
 	return ACPI_INTERRUPT_HANDLED;
 }

 static void acpi_gpe_irq_cleanup(struct si_sm_io *io)
 {
 	if (!io->irq)
 		return;

 	ipmi_irq_start_cleanup(io);
 	acpi_remove_gpe_handler(NULL, io->irq, &ipmi_acpi_gpe);
 }

 static int acpi_gpe_irq_setup(struct si_sm_io *io)
 {
 	acpi_status status;

 	if (!io->irq)
 		return 0;

 	status = acpi_install_gpe_handler(NULL,
 					  io->irq,
 					  ACPI_GPE_LEVEL_TRIGGERED,
 					  &ipmi_acpi_gpe,
 					  io);
 	if (status != AE_OK) {
 		dev_warn(io->dev,
 			 "Unable to claim ACPI GPE %d, running polled\n",
 			 io->irq);
 		io->irq = 0;
 		return -EINVAL;
 	} else {
 		io->irq_cleanup = acpi_gpe_irq_cleanup;
 		ipmi_irq_finish_setup(io);
 		dev_info(io->dev, "Using ACPI GPE %d\n", io->irq);
 		return 0;
 	}
 }
 #endif

 static struct resource *
 ipmi_get_info_from_resources(struct platform_device *pdev,
 			     struct si_sm_io *io)
 {
 	struct resource *res, *res_second;

 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 	if (res) {
 		io->addr_space = IPMI_IO_ADDR_SPACE;
 	} else {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 		if (res)
 			io->addr_space = IPMI_MEM_ADDR_SPACE;
 	}
 	if (!res) {
 		dev_err(&pdev->dev, "no I/O or memory address\n");
 		return NULL;
 	}
 	io->addr_data = res->start;

 	io->regspacing = DEFAULT_REGSPACING;
 	res_second = platform_get_resource(pdev,
 			       (io->addr_space == IPMI_IO_ADDR_SPACE) ?
 					IORESOURCE_IO : IORESOURCE_MEM,
 			       1);
 	if (res_second) {
 		if (res_second->start > io->addr_data)
 			io->regspacing = res_second->start - io->addr_data;
 	}

 	return res;
 }

 static int platform_ipmi_probe(struct platform_device *pdev)
 {
 	struct si_sm_io io;
 	u8 type, slave_addr, addr_source, regsize, regshift;
 	int rv;

 	rv = device_property_read_u8(&pdev->dev, "addr-source", &addr_source);
 	if (rv)
 		addr_source = SI_PLATFORM;
 	if (addr_source >= SI_LAST)
 		return -EINVAL;

 	if (addr_source == SI_SMBIOS) {
 		if (!si_trydmi)
 			return -ENODEV;
 	} else if (addr_source != SI_HARDCODED) {
 		if (!si_tryplatform)
 			return -ENODEV;
 	}

 	rv = device_property_read_u8(&pdev->dev, "ipmi-type", &type);
 	if (rv)
 		return -ENODEV;

 	memset(&io, 0, sizeof(io));
 	io.addr_source = addr_source;
 	dev_info(&pdev->dev, "probing via %s\n",
 		 ipmi_addr_src_to_str(addr_source));

 	switch (type) {
 	case SI_KCS:
 	case SI_SMIC:
 	case SI_BT:
 		io.si_type = type;
 		break;
 	case SI_TYPE_INVALID: /* User disabled this in hardcode. */
 		return -ENODEV;
 	default:
 		dev_err(&pdev->dev, "ipmi-type property is invalid\n");
 		return -EINVAL;
 	}

 	io.regsize = DEFAULT_REGSIZE;
 	rv = device_property_read_u8(&pdev->dev, "reg-size", &regsize);
 	if (!rv)
 		io.regsize = regsize;

 	io.regshift = 0;
 	rv = device_property_read_u8(&pdev->dev, "reg-shift", &regshift);
 	if (!rv)
 		io.regshift = regshift;

 	if (!ipmi_get_info_from_resources(pdev, &io))
 		return -EINVAL;

 	rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
 	if (rv)
 		io.slave_addr = 0x20;
 	else
 		io.slave_addr = slave_addr;

 	io.irq = platform_get_irq_optional(pdev, 0);
 	if (io.irq > 0)
 		io.irq_setup = ipmi_std_irq_setup;
 	else
 		io.irq = 0;

 	io.dev = &pdev->dev;

 	pr_info("ipmi_si: %s: %s %#lx regsize %d spacing %d irq %d\n",
 		ipmi_addr_src_to_str(addr_source),
 		(io.addr_space == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
 		io.addr_data, io.regsize, io.regspacing, io.irq);

 	ipmi_si_add_smi(&io);

 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id of_ipmi_match[] = {
 	{ .type = "ipmi", .compatible = "ipmi-kcs",
 	  .data = (void *)(unsigned long) SI_KCS },
 	{ .type = "ipmi", .compatible = "ipmi-smic",
 	  .data = (void *)(unsigned long) SI_SMIC },
 	{ .type = "ipmi", .compatible = "ipmi-bt",
 	  .data = (void *)(unsigned long) SI_BT },
 	{},
 };
 MODULE_DEVICE_TABLE(of, of_ipmi_match);

 static int of_ipmi_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 	struct si_sm_io io;
 	struct resource resource;
 	const __be32 *regsize, *regspacing, *regshift;
 	struct device_node *np = pdev->dev.of_node;
 	int ret;
 	int proplen;

 	if (!si_tryopenfirmware)
 		return -ENODEV;

 	dev_info(&pdev->dev, "probing via device tree\n");

 	match = of_match_device(of_ipmi_match, &pdev->dev);
 	if (!match)
 		return -ENODEV;

 	if (!of_device_is_available(np))
 		return -EINVAL;

 	ret = of_address_to_resource(np, 0, &resource);
 	if (ret) {
 		dev_warn(&pdev->dev, "invalid address from OF\n");
 		return ret;
 	}

 	regsize = of_get_property(np, "reg-size", &proplen);
 	if (regsize && proplen != 4) {
 		dev_warn(&pdev->dev, "invalid regsize from OF\n");
 		return -EINVAL;
 	}

 	regspacing = of_get_property(np, "reg-spacing", &proplen);
 	if (regspacing && proplen != 4) {
 		dev_warn(&pdev->dev, "invalid regspacing from OF\n");
 		return -EINVAL;
 	}

 	regshift = of_get_property(np, "reg-shift", &proplen);
 	if (regshift && proplen != 4) {
 		dev_warn(&pdev->dev, "invalid regshift from OF\n");
 		return -EINVAL;
 	}

 	memset(&io, 0, sizeof(io));
 	io.si_type	= (enum si_type) match->data;
 	io.addr_source	= SI_DEVICETREE;
 	io.irq_setup	= ipmi_std_irq_setup;

 	if (resource.flags & IORESOURCE_IO)
 		io.addr_space = IPMI_IO_ADDR_SPACE;
 	else
 		io.addr_space = IPMI_MEM_ADDR_SPACE;

 	io.addr_data	= resource.start;

 	io.regsize	= regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
 	io.regspacing	= regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
 	io.regshift	= regshift ? be32_to_cpup(regshift) : 0;

 	io.irq		= irq_of_parse_and_map(pdev->dev.of_node, 0);
 	io.dev		= &pdev->dev;

 	dev_dbg(&pdev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
 		io.addr_data, io.regsize, io.regspacing, io.irq);

 	return ipmi_si_add_smi(&io);
 }
 #else
 #define of_ipmi_match NULL
 static int of_ipmi_probe(struct platform_device *dev)
 {
 	return -ENODEV;
 }
 #endif

 #ifdef CONFIG_ACPI
 static int find_slave_address(struct si_sm_io *io, int slave_addr)
 {
 #ifdef CONFIG_IPMI_DMI_DECODE
 	if (!slave_addr)
 		slave_addr = ipmi_dmi_get_slave_addr(io->si_type,
 						     io->addr_space,
 						     io->addr_data);
 #endif

 	return slave_addr;
 }

 static int acpi_ipmi_probe(struct platform_device *pdev)
 {
 	struct si_sm_io io;
 	acpi_handle handle;
 	acpi_status status;
 	unsigned long long tmp;
 	struct resource *res;
 	int rv = -EINVAL;

 	if (!si_tryacpi)
 		return -ENODEV;

 	handle = ACPI_HANDLE(&pdev->dev);
 	if (!handle)
 		return -ENODEV;

 	memset(&io, 0, sizeof(io));
 	io.addr_source = SI_ACPI;
 	dev_info(&pdev->dev, "probing via ACPI\n");

 	io.addr_info.acpi_info.acpi_handle = handle;

 	/* _IFT tells us the interface type: KCS, BT, etc */
 	status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
 	if (ACPI_FAILURE(status)) {
 		dev_err(&pdev->dev,
 			"Could not find ACPI IPMI interface type\n");
 		goto err_free;
 	}

 	switch (tmp) {
 	case 1:
 		io.si_type = SI_KCS;
 		break;
 	case 2:
 		io.si_type = SI_SMIC;
 		break;
 	case 3:
 		io.si_type = SI_BT;
 		break;
 	case 4: /* SSIF, just ignore */
 		rv = -ENODEV;
 		goto err_free;
 	default:
 		dev_info(&pdev->dev, "unknown IPMI type %lld\n", tmp);
 		goto err_free;
 	}

 	io.regsize = DEFAULT_REGSIZE;
 	io.regshift = 0;

 	res = ipmi_get_info_from_resources(pdev, &io);
 	if (!res) {
 		rv = -EINVAL;
 		goto err_free;
 	}

 	/* If _GPE exists, use it; otherwise use standard interrupts */
 	status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
 	if (ACPI_SUCCESS(status)) {
 		io.irq = tmp;
 		io.irq_setup = acpi_gpe_irq_setup;
 	} else {
 		int irq = platform_get_irq_optional(pdev, 0);

 		if (irq > 0) {
 			io.irq = irq;
 			io.irq_setup = ipmi_std_irq_setup;
 		}
 	}

 	io.slave_addr = find_slave_address(&io, io.slave_addr);

 	io.dev = &pdev->dev;

 	dev_info(io.dev, "%pR regsize %d spacing %d irq %d\n",
 		 res, io.regsize, io.regspacing, io.irq);

 	request_module("acpi_ipmi");

 	return ipmi_si_add_smi(&io);

 err_free:
 	return rv;
 }

 static const struct acpi_device_id acpi_ipmi_match[] = {
 	{ "IPI0001", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match);
 #else
 static int acpi_ipmi_probe(struct platform_device *dev)
 {
 	return -ENODEV;
 }
 #endif

 static int ipmi_probe(struct platform_device *pdev)
 {
 	if (pdev->dev.of_node && of_ipmi_probe(pdev) == 0)
 		return 0;

 	if (acpi_ipmi_probe(pdev) == 0)
 		return 0;

 	return platform_ipmi_probe(pdev);
 }

 static int ipmi_remove(struct platform_device *pdev)
 {
 	return ipmi_si_remove_by_dev(&pdev->dev);
 }

 static int pdev_match_name(struct device *dev, const void *data)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	const char *name = data;

 	return strcmp(pdev->name, name) == 0;
 }

 void ipmi_remove_platform_device_by_name(char *name)
 {
 	struct device *dev;

 	while ((dev = bus_find_device(&platform_bus_type, NULL, name,
 				      pdev_match_name))) {
 		struct platform_device *pdev = to_platform_device(dev);

 		platform_device_unregister(pdev);
 		put_device(dev);
 	}
 }

 static const struct platform_device_id si_plat_ids[] = {
 	{ "dmi-ipmi-si", 0 },
 	{ "hardcode-ipmi-si", 0 },
 	{ "hotmod-ipmi-si", 0 },
 	{ }
 };

 struct platform_driver ipmi_platform_driver = {
 	.driver = {
 		.name = SI_DEVICE_NAME,
 		.of_match_table = of_ipmi_match,
 		.acpi_match_table = ACPI_PTR(acpi_ipmi_match),
 	},
 	.probe		= ipmi_probe,
 	.remove		= ipmi_remove,
 	.id_table       = si_plat_ids
 };

 void ipmi_si_platform_init(void)
 {
 	int rv = platform_driver_register(&ipmi_platform_driver);
 	if (rv)
 		pr_err("Unable to register driver: %d\n", rv);
 	else
 		platform_registered = true;
 }

 void ipmi_si_platform_shutdown(void)
 {
 	if (platform_registered)
 		platform_driver_unregister(&ipmi_platform_driver);
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* ipmi_si_platform.c
	*
	* Handling for platform devices in IPMI (ACPI, OF, and things
	* coming from the platform.
	*/

	#define pr_fmt(fmt) "ipmi_platform: " fmt
	#define dev_fmt pr_fmt

	#include <linux/types.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/of_platform.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/acpi.h>
	#include "ipmi_si.h"
	#include "ipmi_dmi.h"

	static bool platform_registered;
	static bool si_tryplatform = true;
	#ifdef CONFIG_ACPI
	static bool si_tryacpi = true;
	#endif
	#ifdef CONFIG_OF
	static bool si_tryopenfirmware = true;
	#endif
	#ifdef CONFIG_DMI
	static bool si_trydmi = true;
	#else
	static bool si_trydmi = false;
	#endif

	module_param_named(tryplatform, si_tryplatform, bool, 0);
	MODULE_PARM_DESC(tryplatform, "Setting this to zero will disable the"
	" default scan of the interfaces identified via platform"
	" interfaces besides ACPI, OpenFirmware, and DMI");
	#ifdef CONFIG_ACPI
	module_param_named(tryacpi, si_tryacpi, bool, 0);
	MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the"
	" default scan of the interfaces identified via ACPI");
	#endif
	#ifdef CONFIG_OF
	module_param_named(tryopenfirmware, si_tryopenfirmware, bool, 0);
	MODULE_PARM_DESC(tryopenfirmware, "Setting this to zero will disable the"
	" default scan of the interfaces identified via OpenFirmware");
	#endif
	#ifdef CONFIG_DMI
	module_param_named(trydmi, si_trydmi, bool, 0);
	MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the"
	" default scan of the interfaces identified via DMI");
	#endif

	#ifdef CONFIG_ACPI
	/* For GPE-type interrupts. */
	static u32 ipmi_acpi_gpe(acpi_handle gpe_device,
	u32 gpe_number, void *context)
	{
	struct si_sm_io *io = context;

	ipmi_si_irq_handler(io->irq, io->irq_handler_data);
	return ACPI_INTERRUPT_HANDLED;
	}

	static void acpi_gpe_irq_cleanup(struct si_sm_io *io)
	{
	if (!io->irq)
	return;

	ipmi_irq_start_cleanup(io);
	acpi_remove_gpe_handler(NULL, io->irq, &ipmi_acpi_gpe);
	}

	static int acpi_gpe_irq_setup(struct si_sm_io *io)
	{
	acpi_status status;

	if (!io->irq)
	return 0;

	status = acpi_install_gpe_handler(NULL,
	io->irq,
	ACPI_GPE_LEVEL_TRIGGERED,
	&ipmi_acpi_gpe,
	io);
	if (status != AE_OK) {
	dev_warn(io->dev,
	"Unable to claim ACPI GPE %d, running polled\n",
	io->irq);
	io->irq = 0;
	return -EINVAL;
	} else {
	io->irq_cleanup = acpi_gpe_irq_cleanup;
	ipmi_irq_finish_setup(io);
	dev_info(io->dev, "Using ACPI GPE %d\n", io->irq);
	return 0;
	}
	}
	#endif

	static struct resource *
	ipmi_get_info_from_resources(struct platform_device *pdev,
	struct si_sm_io *io)
	{
	struct resource res, res_second;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (res) {
	io->addr_space = IPMI_IO_ADDR_SPACE;
	} else {
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res)
	io->addr_space = IPMI_MEM_ADDR_SPACE;
	}
	if (!res) {
	dev_err(&pdev->dev, "no I/O or memory address\n");
	return NULL;
	}
	io->addr_data = res->start;

	io->regspacing = DEFAULT_REGSPACING;
	res_second = platform_get_resource(pdev,
	(io->addr_space == IPMI_IO_ADDR_SPACE) ?
	IORESOURCE_IO : IORESOURCE_MEM,
	1);
	if (res_second) {
	if (res_second->start > io->addr_data)
	io->regspacing = res_second->start - io->addr_data;
	}

	return res;
	}

	static int platform_ipmi_probe(struct platform_device *pdev)
	{
	struct si_sm_io io;
	u8 type, slave_addr, addr_source, regsize, regshift;
	int rv;

	rv = device_property_read_u8(&pdev->dev, "addr-source", &addr_source);
	if (rv)
	addr_source = SI_PLATFORM;
	if (addr_source >= SI_LAST)
	return -EINVAL;

	if (addr_source == SI_SMBIOS) {
	if (!si_trydmi)
	return -ENODEV;
	} else if (addr_source != SI_HARDCODED) {
	if (!si_tryplatform)
	return -ENODEV;
	}

	rv = device_property_read_u8(&pdev->dev, "ipmi-type", &type);
	if (rv)
	return -ENODEV;

	memset(&io, 0, sizeof(io));
	io.addr_source = addr_source;
	dev_info(&pdev->dev, "probing via %s\n",
	ipmi_addr_src_to_str(addr_source));

	switch (type) {
	case SI_KCS:
	case SI_SMIC:
	case SI_BT:
	io.si_type = type;
	break;
	case SI_TYPE_INVALID: /* User disabled this in hardcode. */
	return -ENODEV;
	default:
	dev_err(&pdev->dev, "ipmi-type property is invalid\n");
	return -EINVAL;
	}

	io.regsize = DEFAULT_REGSIZE;
	rv = device_property_read_u8(&pdev->dev, "reg-size", &regsize);
	if (!rv)
	io.regsize = regsize;

	io.regshift = 0;
	rv = device_property_read_u8(&pdev->dev, "reg-shift", &regshift);
	if (!rv)
	io.regshift = regshift;

	if (!ipmi_get_info_from_resources(pdev, &io))
	return -EINVAL;

	rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
	if (rv)
	io.slave_addr = 0x20;
	else
	io.slave_addr = slave_addr;

	io.irq = platform_get_irq_optional(pdev, 0);
	if (io.irq > 0)
	io.irq_setup = ipmi_std_irq_setup;
	else
	io.irq = 0;

	io.dev = &pdev->dev;

	pr_info("ipmi_si: %s: %s %#lx regsize %d spacing %d irq %d\n",
	ipmi_addr_src_to_str(addr_source),
	(io.addr_space == IPMI_IO_ADDR_SPACE) ? "io" : "mem",
	io.addr_data, io.regsize, io.regspacing, io.irq);

	ipmi_si_add_smi(&io);

	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id of_ipmi_match[] = {
	{ .type = "ipmi", .compatible = "ipmi-kcs",
	.data = (void *)(unsigned long) SI_KCS },
	{ .type = "ipmi", .compatible = "ipmi-smic",
	.data = (void *)(unsigned long) SI_SMIC },
	{ .type = "ipmi", .compatible = "ipmi-bt",
	.data = (void *)(unsigned long) SI_BT },
	{},
	};
	MODULE_DEVICE_TABLE(of, of_ipmi_match);

	static int of_ipmi_probe(struct platform_device *pdev)
	{
	const struct of_device_id *match;
	struct si_sm_io io;
	struct resource resource;
	const __be32 regsize, regspacing, *regshift;
	struct device_node *np = pdev->dev.of_node;
	int ret;
	int proplen;

	if (!si_tryopenfirmware)
	return -ENODEV;

	dev_info(&pdev->dev, "probing via device tree\n");

	match = of_match_device(of_ipmi_match, &pdev->dev);
	if (!match)
	return -ENODEV;

	if (!of_device_is_available(np))
	return -EINVAL;

	ret = of_address_to_resource(np, 0, &resource);
	if (ret) {
	dev_warn(&pdev->dev, "invalid address from OF\n");
	return ret;
	}

	regsize = of_get_property(np, "reg-size", &proplen);
	if (regsize && proplen != 4) {
	dev_warn(&pdev->dev, "invalid regsize from OF\n");
	return -EINVAL;
	}

	regspacing = of_get_property(np, "reg-spacing", &proplen);
	if (regspacing && proplen != 4) {
	dev_warn(&pdev->dev, "invalid regspacing from OF\n");
	return -EINVAL;
	}

	regshift = of_get_property(np, "reg-shift", &proplen);
	if (regshift && proplen != 4) {
	dev_warn(&pdev->dev, "invalid regshift from OF\n");
	return -EINVAL;
	}

	memset(&io, 0, sizeof(io));
	io.si_type = (enum si_type) match->data;
	io.addr_source = SI_DEVICETREE;
	io.irq_setup = ipmi_std_irq_setup;

	if (resource.flags & IORESOURCE_IO)
	io.addr_space = IPMI_IO_ADDR_SPACE;
	else
	io.addr_space = IPMI_MEM_ADDR_SPACE;

	io.addr_data = resource.start;

	io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE;
	io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING;
	io.regshift = regshift ? be32_to_cpup(regshift) : 0;

	io.irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
	io.dev = &pdev->dev;

	dev_dbg(&pdev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n",
	io.addr_data, io.regsize, io.regspacing, io.irq);

	return ipmi_si_add_smi(&io);
	}
	#else
	#define of_ipmi_match NULL
	static int of_ipmi_probe(struct platform_device *dev)
	{
	return -ENODEV;
	}
	#endif

	#ifdef CONFIG_ACPI
	static int find_slave_address(struct si_sm_io *io, int slave_addr)
	{
	#ifdef CONFIG_IPMI_DMI_DECODE
	if (!slave_addr)
	slave_addr = ipmi_dmi_get_slave_addr(io->si_type,
	io->addr_space,
	io->addr_data);
	#endif

	return slave_addr;
	}

	static int acpi_ipmi_probe(struct platform_device *pdev)
	{
	struct si_sm_io io;
	acpi_handle handle;
	acpi_status status;
	unsigned long long tmp;
	struct resource *res;
	int rv = -EINVAL;

	if (!si_tryacpi)
	return -ENODEV;

	handle = ACPI_HANDLE(&pdev->dev);
	if (!handle)
	return -ENODEV;

	memset(&io, 0, sizeof(io));
	io.addr_source = SI_ACPI;
	dev_info(&pdev->dev, "probing via ACPI\n");

	io.addr_info.acpi_info.acpi_handle = handle;

	/* _IFT tells us the interface type: KCS, BT, etc */
	status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp);
	if (ACPI_FAILURE(status)) {
	dev_err(&pdev->dev,
	"Could not find ACPI IPMI interface type\n");
	goto err_free;
	}

	switch (tmp) {
	case 1:
	io.si_type = SI_KCS;
	break;
	case 2:
	io.si_type = SI_SMIC;
	break;
	case 3:
	io.si_type = SI_BT;
	break;
	case 4: /* SSIF, just ignore */
	rv = -ENODEV;
	goto err_free;
	default:
	dev_info(&pdev->dev, "unknown IPMI type %lld\n", tmp);
	goto err_free;
	}

	io.regsize = DEFAULT_REGSIZE;
	io.regshift = 0;

	res = ipmi_get_info_from_resources(pdev, &io);
	if (!res) {
	rv = -EINVAL;
	goto err_free;
	}

	/* If _GPE exists, use it; otherwise use standard interrupts */
	status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
	if (ACPI_SUCCESS(status)) {
	io.irq = tmp;
	io.irq_setup = acpi_gpe_irq_setup;
	} else {
	int irq = platform_get_irq_optional(pdev, 0);

	if (irq > 0) {
	io.irq = irq;
	io.irq_setup = ipmi_std_irq_setup;
	}
	}

	io.slave_addr = find_slave_address(&io, io.slave_addr);

	io.dev = &pdev->dev;

	dev_info(io.dev, "%pR regsize %d spacing %d irq %d\n",
	res, io.regsize, io.regspacing, io.irq);

	request_module("acpi_ipmi");

	return ipmi_si_add_smi(&io);

	err_free:
	return rv;
	}

	static const struct acpi_device_id acpi_ipmi_match[] = {
	{ "IPI0001", 0 },
	{ },
	};
	MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match);
	#else
	static int acpi_ipmi_probe(struct platform_device *dev)
	{
	return -ENODEV;
	}
	#endif

	static int ipmi_probe(struct platform_device *pdev)
	{
	if (pdev->dev.of_node && of_ipmi_probe(pdev) == 0)
	return 0;

	if (acpi_ipmi_probe(pdev) == 0)
	return 0;

	return platform_ipmi_probe(pdev);
	}

	static int ipmi_remove(struct platform_device *pdev)
	{
	return ipmi_si_remove_by_dev(&pdev->dev);
	}

	static int pdev_match_name(struct device dev, const void data)
	{
	struct platform_device *pdev = to_platform_device(dev);
	const char *name = data;

	return strcmp(pdev->name, name) == 0;
	}

	void ipmi_remove_platform_device_by_name(char *name)
	{
	struct device *dev;

	while ((dev = bus_find_device(&platform_bus_type, NULL, name,
	pdev_match_name))) {
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);
	put_device(dev);
	}
	}

	static const struct platform_device_id si_plat_ids[] = {
	{ "dmi-ipmi-si", 0 },
	{ "hardcode-ipmi-si", 0 },
	{ "hotmod-ipmi-si", 0 },
	{ }
	};

	struct platform_driver ipmi_platform_driver = {
	.driver = {
	.name = SI_DEVICE_NAME,
	.of_match_table = of_ipmi_match,
	.acpi_match_table = ACPI_PTR(acpi_ipmi_match),
	},
	.probe = ipmi_probe,
	.remove = ipmi_remove,
	.id_table = si_plat_ids
	};

	void ipmi_si_platform_init(void)
	{
	int rv = platform_driver_register(&ipmi_platform_driver);
	if (rv)
	pr_err("Unable to register driver: %d\n", rv);
	else
	platform_registered = true;
	}

	void ipmi_si_platform_shutdown(void)
	{
	if (platform_registered)
	platform_driver_unregister(&ipmi_platform_driver);
	}