1 // SPDX-License-Identifier: GPL-2.0+
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
67 	} slot;  member
74 /* struct notification - keeps info about the device
82 static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status);
83 static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status);
88 				   char *buffer, loff_t pos, size_t size);
112  * ibm_slot_from_id - workaround for bad ibm hardware
113  * @id: the slot number that linux refers to the slot by
115  * Description: This method returns the aCPI slot descriptor
116  * corresponding to the Linux slot number.  This descriptor
117  * has info about the aPCI slot id and attention status.
122 	int ind = 0, size;  in ibm_slot_from_id()  local
126 	size = ibm_get_table_from_acpi(&table);  in ibm_slot_from_id()
127 	if (size < 0)  in ibm_slot_from_id()
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
154  * @slot: the hotplug_slot to work with
160 static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status)  in ibm_set_attention_status()  argument
167 	int id = hpslot_to_sun(slot);  in ibm_set_attention_status()
171 		pr_err("APLS null ACPI descriptor for slot %d\n", id);  in ibm_set_attention_status()
172 		return -ENODEV;  in ibm_set_attention_status()
175 	pr_debug("%s: set slot %d (%d) attention status to %d\n", __func__,  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
199  * @slot: the hotplug_slot to work with
207  * slot descriptor to read the status from that.
209 static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status)  in ibm_get_attention_status()  argument
212 	int id = hpslot_to_sun(slot);  in ibm_get_attention_status()
216 		pr_err("APLS null ACPI descriptor for slot %d\n", id);  in ibm_get_attention_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()
225 	pr_debug("%s: get slot %d (%d) attention status is %d\n", __func__,  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
244  * ID comes first and then the slot number that caused it.  We report
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
277  * the size of the table and returns that without filling
280  * Returns < 0 on error or the size of the table on success.
288 	int i, size = -EIO;  in ibm_get_table_from_acpi()  local
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()
315 	lbuf = kzalloc(size, GFP_KERNEL);  in ibm_get_table_from_acpi()
316 	pr_debug("%s: element count: %i, ASL table size: %i, &table = 0x%p\n",  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()
326 	size = 0;  in ibm_get_table_from_acpi()
327 	for (i = 0; i < package->package.count; i++) {  in ibm_get_table_from_acpi()
328 		memcpy(&lbuf[size],  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()
336 	return size;  in ibm_get_table_from_acpi()
340  * ibm_read_apci_table - callback for the sysfs apci_table file
346  * @size: the number of bytes requested
357 				   char *buffer, loff_t pos, size_t size)  in ibm_read_apci_table()  argument
359 	int bytes_read = -EINVAL;  in ibm_read_apci_table()
362 	pr_debug("%s: pos = %d, size = %zd\n", __func__, (int)pos, size);  in ibm_read_apci_table()
366 		if (bytes_read > 0 && bytes_read <= size)  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()
458 	ibm_apci_table_attr.size = ibm_get_table_from_acpi(NULL);  in ibm_acpiphp_init()
472 	struct kobject *sysdir = &pci_slots_kset->kobj;  in ibm_acpiphp_exit()