1 // SPDX-License-Identifier: GPL-2.0+
3  * ACPI PCI Hot Plug IBM Extension
23 #include <linux/pci.h>
27 #include "../pci.h"
31 #define DRIVER_DESC	"ACPI Hot Plug PCI Controller Driver IBM extension"
40 /* these are the names for the IBM ACPI pseudo-device */
44 #define hpslot_to_sun(A) (to_slot(A)->sun)
46 /* union apci_descriptor - allows access to the
52 		char sig[4];  member
74 /* struct notification - keeps info about the device
112  * ibm_slot_from_id - workaround for bad ibm hardware
130 	if (memcmp(des->header.sig, "aPCI", 4) != 0)  in ibm_slot_from_id()
133 	des = (union apci_descriptor *)&table[ind += des->header.len];  in ibm_slot_from_id()
134 	while (ind < size && (des->generic.type != 0x82 ||  in ibm_slot_from_id()
135 			des->slot.slot_num != id)) {  in ibm_slot_from_id()
136 		des = (union apci_descriptor *)&table[ind += des->generic.len];  in ibm_slot_from_id()
139 	if (ind < size && des->slot.slot_num == id)  in ibm_slot_from_id()
153  * ibm_set_attention_status - callback method to set the attention LED
172 		return -ENODEV;  in ibm_set_attention_status()
176 			ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,  in ibm_set_attention_status()
180 	args[0].integer.value = ibm_slot->slot.slot_id;  in ibm_set_attention_status()
189 		return -ENODEV;  in ibm_set_attention_status()
192 		return -ERANGE;  in ibm_set_attention_status()
198  * ibm_get_attention_status - callback method to get attention LED status
217 		return -ENODEV;  in ibm_get_attention_status()
220 	if (ibm_slot->slot.attn & 0xa0 || ibm_slot->slot.status[1] & 0x08)  in ibm_get_attention_status()
226 			ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,  in ibm_get_attention_status()
234  * ibm_handle_events - listens for ACPI events for the IBM37D0 device
248  * only re-enable the interrupt that causes this event AFTER this method
261 		acpi_bus_generate_netlink_event(note->device->pnp.device_class,  in ibm_handle_events()
262 						  dev_name(&note->device->dev),  in ibm_handle_events()
263 						  note->event, detail);  in ibm_handle_events()
265 		note->event = event;  in ibm_handle_events()
269  * ibm_get_table_from_acpi - reads the APLS buffer from ACPI
288 	int i, size = -EIO;  in ibm_get_table_from_acpi()
293 		return -ENODEV;  in ibm_get_table_from_acpi()
298 			(package->type != ACPI_TYPE_PACKAGE) ||  in ibm_get_table_from_acpi()
299 			!(package->package.elements)) {  in ibm_get_table_from_acpi()
304 	for (size = 0, i = 0; i < package->package.count; i++) {  in ibm_get_table_from_acpi()
305 		if (package->package.elements[i].type != ACPI_TYPE_BUFFER) {  in ibm_get_table_from_acpi()
309 		size += package->package.elements[i].buffer.length;  in ibm_get_table_from_acpi()
317 			__func__, package->package.count, size, lbuf);  in ibm_get_table_from_acpi()
322 		size = -ENOMEM;  in ibm_get_table_from_acpi()
327 	for (i = 0; i < package->package.count; i++) {  in ibm_get_table_from_acpi()
329 				package->package.elements[i].buffer.pointer,  in ibm_get_table_from_acpi()
330 				package->package.elements[i].buffer.length);  in ibm_get_table_from_acpi()
331 		size += package->package.elements[i].buffer.length;  in ibm_get_table_from_acpi()
340  * ibm_read_apci_table - callback for the sysfs apci_table file
349  * to be executed when /sys/bus/pci/slots/apci_table gets read.
359 	int bytes_read = -EINVAL;  in ibm_read_apci_table()
374  * ibm_find_acpi_device - callback to find our ACPI device
381  * to find our device.  When this method returns non-zero
402 	if (current_status && (info->valid & ACPI_VALID_HID) &&  in ibm_find_acpi_device()
403 			(!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||  in ibm_find_acpi_device()
404 			 !strcmp(info->hardware_id.string, IBM_HARDWARE_ID2))) {  in ibm_find_acpi_device()
406 			info->hardware_id.string, handle);  in ibm_find_acpi_device()
408 		/* returning non-zero causes the search to stop  in ibm_find_acpi_device()
424 	struct kobject *sysdir = &pci_slots_kset->kobj;  in ibm_acpiphp_init()
432 		retval = -ENODEV;  in ibm_acpiphp_init()
439 		retval = -ENODEV;  in ibm_acpiphp_init()
443 		retval = -ENODEV;  in ibm_acpiphp_init()
454 		retval = -EBUSY;  in ibm_acpiphp_init()
472 	struct kobject *sysdir = &pci_slots_kset->kobj;  in ibm_acpiphp_exit()