2 * ACPI PCI Hot Plug Controller Driver
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
8 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
9 * Copyright (C) 2002,2003 NEC Corporation
10 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
11 * Copyright (C) 2003-2005 Hewlett Packard
13 * All rights reserved.
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or (at
18 * your option) any later version.
20 * This program is distributed in the hope that it will be useful, but
21 * WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
23 * NON INFRINGEMENT. See the GNU General Public License for more
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 * Send feedback to <kristen.c.accardi@intel.com>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
38 #include <linux/kernel.h>
39 #include <linux/pci.h>
40 #include <linux/pci_hotplug.h>
41 #include <linux/slab.h>
42 #include <linux/smp.h>
45 #define MY_NAME "acpiphp"
47 /* name size which is used for entries in pcihpfs */
48 #define SLOT_NAME_SIZE 21 /* {_SUN} */
55 static struct acpiphp_attention_info *attention_info;
57 #define DRIVER_VERSION "0.5"
58 #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>"
59 #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver"
61 MODULE_AUTHOR(DRIVER_AUTHOR);
62 MODULE_DESCRIPTION(DRIVER_DESC);
63 MODULE_LICENSE("GPL");
64 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
65 module_param(debug, bool, 0644);
67 /* export the attention callback registration methods */
68 EXPORT_SYMBOL_GPL(acpiphp_register_attention);
69 EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
71 static int enable_slot (struct hotplug_slot *slot);
72 static int disable_slot (struct hotplug_slot *slot);
73 static int set_attention_status (struct hotplug_slot *slot, u8 value);
74 static int get_power_status (struct hotplug_slot *slot, u8 *value);
75 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
76 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
77 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
79 static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
81 .enable_slot = enable_slot,
82 .disable_slot = disable_slot,
83 .set_attention_status = set_attention_status,
84 .get_power_status = get_power_status,
85 .get_attention_status = get_attention_status,
86 .get_latch_status = get_latch_status,
87 .get_adapter_status = get_adapter_status,
91 * acpiphp_register_attention - set attention LED callback
92 * @info: must be completely filled with LED callbacks
94 * Description: This is used to register a hardware specific ACPI
95 * driver that manipulates the attention LED. All the fields in
98 int acpiphp_register_attention(struct acpiphp_attention_info *info)
100 int retval = -EINVAL;
102 if (info && info->owner && info->set_attn &&
103 info->get_attn && !attention_info) {
105 attention_info = info;
112 * acpiphp_unregister_attention - unset attention LED callback
113 * @info: must match the pointer used to register
115 * Description: This is used to un-register a hardware specific acpi
116 * driver that manipulates the attention LED. The pointer to the
117 * info struct must be the same as the one used to set it.
119 int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
121 int retval = -EINVAL;
123 if (info && attention_info == info) {
124 attention_info = NULL;
132 * enable_slot - power on and enable a slot
133 * @hotplug_slot: slot to enable
135 * Actual tasks are done in acpiphp_enable_slot()
137 static int enable_slot(struct hotplug_slot *hotplug_slot)
139 struct slot *slot = hotplug_slot->private;
141 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
143 /* enable the specified slot */
144 return acpiphp_enable_slot(slot->acpi_slot);
149 * disable_slot - disable and power off a slot
150 * @hotplug_slot: slot to disable
152 * Actual tasks are done in acpiphp_disable_slot()
154 static int disable_slot(struct hotplug_slot *hotplug_slot)
156 struct slot *slot = hotplug_slot->private;
159 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
161 /* disable the specified slot */
162 retval = acpiphp_disable_slot(slot->acpi_slot);
164 retval = acpiphp_eject_slot(slot->acpi_slot);
170 * set_attention_status - set attention LED
171 * @hotplug_slot: slot to set attention LED on
172 * @status: value to set attention LED to (0 or 1)
174 * attention status LED, so we use a callback that
175 * was registered with us. This allows hardware specific
176 * ACPI implementations to blink the light for us.
178 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
180 int retval = -ENODEV;
182 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
184 if (attention_info && try_module_get(attention_info->owner)) {
185 retval = attention_info->set_attn(hotplug_slot, status);
186 module_put(attention_info->owner);
188 attention_info = NULL;
194 * get_power_status - get power status of a slot
195 * @hotplug_slot: slot to get status
196 * @value: pointer to store status
198 * Some platforms may not implement _STA method properly.
199 * In that case, the value returned may not be reliable.
201 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
203 struct slot *slot = hotplug_slot->private;
205 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
207 *value = acpiphp_get_power_status(slot->acpi_slot);
214 * get_attention_status - get attention LED status
215 * @hotplug_slot: slot to get status from
216 * @value: returns with value of attention LED
218 * ACPI doesn't have known method to determine the state
219 * of the attention status LED, so we use a callback that
220 * was registered with us. This allows hardware specific
221 * ACPI implementations to determine its state.
223 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
225 int retval = -EINVAL;
227 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot));
229 if (attention_info && try_module_get(attention_info->owner)) {
230 retval = attention_info->get_attn(hotplug_slot, value);
231 module_put(attention_info->owner);
233 attention_info = NULL;
239 * get_latch_status - get latch status of a slot
240 * @hotplug_slot: slot to get status
241 * @value: pointer to store status
243 * ACPI doesn't provide any formal means to access latch status.
244 * Instead, we fake latch status from _STA.
246 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
248 struct slot *slot = hotplug_slot->private;
250 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
252 *value = acpiphp_get_latch_status(slot->acpi_slot);
259 * get_adapter_status - get adapter status of a slot
260 * @hotplug_slot: slot to get status
261 * @value: pointer to store status
263 * ACPI doesn't provide any formal means to access adapter status.
264 * Instead, we fake adapter status from _STA.
266 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
268 struct slot *slot = hotplug_slot->private;
270 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
272 *value = acpiphp_get_adapter_status(slot->acpi_slot);
277 static int __init init_acpi(void)
281 /* initialize internal data structure etc. */
282 retval = acpiphp_glue_init();
284 /* read initial number of slots */
286 num_slots = acpiphp_get_num_slots();
287 if (num_slots == 0) {
297 * release_slot - free up the memory used by a slot
298 * @hotplug_slot: slot to free
300 static void release_slot(struct hotplug_slot *hotplug_slot)
302 struct slot *slot = hotplug_slot->private;
304 dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
306 kfree(slot->hotplug_slot);
310 /* callback routine to initialize 'struct slot' for each slot */
311 int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
314 int retval = -ENOMEM;
315 char name[SLOT_NAME_SIZE];
317 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
321 slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL);
322 if (!slot->hotplug_slot)
325 slot->hotplug_slot->info = &slot->info;
327 slot->hotplug_slot->private = slot;
328 slot->hotplug_slot->release = &release_slot;
329 slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
331 slot->acpi_slot = acpiphp_slot;
332 slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
333 slot->hotplug_slot->info->attention_status = 0;
334 slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
335 slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
336 slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
337 slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
339 acpiphp_slot->slot = slot;
340 snprintf(name, SLOT_NAME_SIZE, "%u", slot->acpi_slot->sun);
342 retval = pci_hp_register(slot->hotplug_slot,
343 acpiphp_slot->bridge->pci_bus,
344 acpiphp_slot->device,
346 if (retval == -EBUSY)
349 err("pci_hp_register failed with error %d\n", retval);
353 info("Slot [%s] registered\n", slot_name(slot));
357 kfree(slot->hotplug_slot);
365 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
367 struct slot *slot = acpiphp_slot->slot;
370 info("Slot [%s] unregistered\n", slot_name(slot));
372 retval = pci_hp_deregister(slot->hotplug_slot);
374 err("pci_hp_deregister failed with error %d\n", retval);
378 static int __init acpiphp_init(void)
380 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
382 if (acpi_pci_disabled)
385 acpiphp_debug = debug;
387 /* read all the ACPI info from the system */
392 static void __exit acpiphp_exit(void)
394 if (acpi_pci_disabled)
397 /* deallocate internal data structures etc. */
401 module_init(acpiphp_init);
402 module_exit(acpiphp_exit);