tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ACPI PCI Hot Plug Controller Driver
3 *
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
12 *
13 * All rights reserved.
14 *
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.
19 *
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
24 * details.
25 *
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.
29 *
30 * Send feedback to <kristen.c.accardi@intel.com>
31 *
32 */
33
34#include <linux/init.h>
35#include <linux/module.h>
36#include <linux/moduleparam.h>
37
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>
43#include <linux/smp_lock.h>
44#include "acpiphp.h"
45
46#define MY_NAME "acpiphp"
47
48static int debug;
49int acpiphp_debug;
50
51/* local variables */
52static int num_slots;
53static struct acpiphp_attention_info *attention_info;
54
55#define DRIVER_VERSION "0.5"
56#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>"
57#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver"
58
59MODULE_AUTHOR(DRIVER_AUTHOR);
60MODULE_DESCRIPTION(DRIVER_DESC);
61MODULE_LICENSE("GPL");
62MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
63module_param(debug, bool, 0644);
64
65/* export the attention callback registration methods */
66EXPORT_SYMBOL_GPL(acpiphp_register_attention);
67EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
68
69static int enable_slot (struct hotplug_slot *slot);
70static int disable_slot (struct hotplug_slot *slot);
71static int set_attention_status (struct hotplug_slot *slot, u8 value);
72static int get_power_status (struct hotplug_slot *slot, u8 *value);
73static int get_attention_status (struct hotplug_slot *slot, u8 *value);
74static int get_address (struct hotplug_slot *slot, u32 *value);
75static int get_latch_status (struct hotplug_slot *slot, u8 *value);
76static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
77
78static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
79 .owner = THIS_MODULE,
80 .enable_slot = enable_slot,
81 .disable_slot = disable_slot,
82 .set_attention_status = set_attention_status,
83 .get_power_status = get_power_status,
84 .get_attention_status = get_attention_status,
85 .get_latch_status = get_latch_status,
86 .get_adapter_status = get_adapter_status,
87 .get_address = get_address,
88};
89
90
91/**
92 * acpiphp_register_attention - set attention LED callback
93 * @info: must be completely filled with LED callbacks
94 *
95 * Description: this is used to register a hardware specific ACPI
96 * driver that manipulates the attention LED. All the fields in
97 * info must be set.
98 **/
99int acpiphp_register_attention(struct acpiphp_attention_info *info)
100{
101 int retval = -EINVAL;
102
103 if (info && info->owner && info->set_attn &&
104 info->get_attn && !attention_info) {
105 retval = 0;
106 attention_info = info;
107 }
108 return retval;
109}
110
111
112/**
113 * acpiphp_unregister_attention - unset attention LED callback
114 * @info: must match the pointer used to register
115 *
116 * Description: this is used to un-register a hardware specific acpi
117 * driver that manipulates the attention LED. The pointer to the
118 * info struct must be the same as the one used to set it.
119 **/
120int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
121{
122 int retval = -EINVAL;
123
124 if (info && attention_info == info) {
125 attention_info = NULL;
126 retval = 0;
127 }
128 return retval;
129}
130
131
132/**
133 * enable_slot - power on and enable a slot
134 * @hotplug_slot: slot to enable
135 *
136 * Actual tasks are done in acpiphp_enable_slot()
137 *
138 */
139static int enable_slot(struct hotplug_slot *hotplug_slot)
140{
141 struct slot *slot = hotplug_slot->private;
142
143 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
144
145 /* enable the specified slot */
146 return acpiphp_enable_slot(slot->acpi_slot);
147}
148
149
150/**
151 * disable_slot - disable and power off a slot
152 * @hotplug_slot: slot to disable
153 *
154 * Actual tasks are done in acpiphp_disable_slot()
155 *
156 */
157static int disable_slot(struct hotplug_slot *hotplug_slot)
158{
159 struct slot *slot = hotplug_slot->private;
160
161 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
162
163 /* disable the specified slot */
164 return acpiphp_disable_slot(slot->acpi_slot);
165}
166
167
168 /**
169 * set_attention_status - set attention LED
170 * @hotplug_slot: slot to set attention LED on
171 * @status: value to set attention LED to (0 or 1)
172 *
173 * attention status LED, so we use a callback that
174 * was registered with us. This allows hardware specific
175 * ACPI implementations to blink the light for us.
176 **/
177 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
178 {
179 int retval = -ENODEV;
180
181 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
182
183 if (attention_info && try_module_get(attention_info->owner)) {
184 retval = attention_info->set_attn(hotplug_slot, status);
185 module_put(attention_info->owner);
186 } else
187 attention_info = NULL;
188 return retval;
189 }
190
191
192/**
193 * get_power_status - get power status of a slot
194 * @hotplug_slot: slot to get status
195 * @value: pointer to store status
196 *
197 * Some platforms may not implement _STA method properly.
198 * In that case, the value returned may not be reliable.
199 *
200 */
201static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
202{
203 struct slot *slot = hotplug_slot->private;
204
205 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
206
207 *value = acpiphp_get_power_status(slot->acpi_slot);
208
209 return 0;
210}
211
212
213 /**
214 * get_attention_status - get attention LED status
215 * @hotplug_slot: slot to get status from
216 * @value: returns with value of attention LED
217 *
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
222 **/
223static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
224{
225 int retval = -EINVAL;
226
227 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
228
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);
232 } else
233 attention_info = NULL;
234 return retval;
235}
236
237
238/**
239 * get_latch_status - get latch status of a slot
240 * @hotplug_slot: slot to get status
241 * @value: pointer to store status
242 *
243 * ACPI doesn't provide any formal means to access latch status.
244 * Instead, we fake latch status from _STA
245 *
246 */
247static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
248{
249 struct slot *slot = hotplug_slot->private;
250
251 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
252
253 *value = acpiphp_get_latch_status(slot->acpi_slot);
254
255 return 0;
256}
257
258
259/**
260 * get_adapter_status - get adapter status of a slot
261 * @hotplug_slot: slot to get status
262 * @value: pointer to store status
263 *
264 * ACPI doesn't provide any formal means to access adapter status.
265 * Instead, we fake adapter status from _STA
266 *
267 */
268static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
269{
270 struct slot *slot = hotplug_slot->private;
271
272 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
273
274 *value = acpiphp_get_adapter_status(slot->acpi_slot);
275
276 return 0;
277}
278
279
280/**
281 * get_address - get pci address of a slot
282 * @hotplug_slot: slot to get status
283 * @value: pointer to struct pci_busdev (seg, bus, dev)
284 */
285static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
286{
287 struct slot *slot = hotplug_slot->private;
288
289 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
290
291 *value = acpiphp_get_address(slot->acpi_slot);
292
293 return 0;
294}
295
296static int __init init_acpi(void)
297{
298 int retval;
299
300 /* initialize internal data structure etc. */
301 retval = acpiphp_glue_init();
302
303 /* read initial number of slots */
304 if (!retval) {
305 num_slots = acpiphp_get_num_slots();
306 if (num_slots == 0)
307 retval = -ENODEV;
308 }
309
310 return retval;
311}
312
313
314/**
315 * make_slot_name - make a slot name that appears in pcihpfs
316 * @slot: slot to name
317 *
318 */
319static void make_slot_name(struct slot *slot)
320{
321 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%u",
322 slot->acpi_slot->sun);
323}
324
325/**
326 * release_slot - free up the memory used by a slot
327 * @hotplug_slot: slot to free
328 */
329static void release_slot(struct hotplug_slot *hotplug_slot)
330{
331 struct slot *slot = hotplug_slot->private;
332
333 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
334
335 kfree(slot->hotplug_slot->info);
336 kfree(slot->hotplug_slot->name);
337 kfree(slot->hotplug_slot);
338 kfree(slot);
339}
340
341/* callback routine to initialize 'struct slot' for each slot */
342int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
343{
344 struct slot *slot;
345 struct hotplug_slot *hotplug_slot;
346 struct hotplug_slot_info *hotplug_slot_info;
347 int retval = -ENOMEM;
348
349 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
350 if (!slot)
351 goto error;
352
353 slot->hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
354 if (!slot->hotplug_slot)
355 goto error_slot;
356
357 slot->hotplug_slot->info = kzalloc(sizeof(*hotplug_slot_info),
358 GFP_KERNEL);
359 if (!slot->hotplug_slot->info)
360 goto error_hpslot;
361
362 slot->hotplug_slot->name = kzalloc(SLOT_NAME_SIZE, GFP_KERNEL);
363 if (!slot->hotplug_slot->name)
364 goto error_info;
365
366 slot->hotplug_slot->private = slot;
367 slot->hotplug_slot->release = &release_slot;
368 slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
369
370 slot->acpi_slot = acpiphp_slot;
371 slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
372 slot->hotplug_slot->info->attention_status = 0;
373 slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
374 slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
375 slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
376 slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
377
378 acpiphp_slot->slot = slot;
379 make_slot_name(slot);
380
381 retval = pci_hp_register(slot->hotplug_slot);
382 if (retval) {
383 err("pci_hp_register failed with error %d\n", retval);
384 goto error_name;
385 }
386
387 info("Slot [%s] registered\n", slot->hotplug_slot->name);
388
389 return 0;
390error_name:
391 kfree(slot->hotplug_slot->name);
392error_info:
393 kfree(slot->hotplug_slot->info);
394error_hpslot:
395 kfree(slot->hotplug_slot);
396error_slot:
397 kfree(slot);
398error:
399 return retval;
400}
401
402
403void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
404{
405 struct slot *slot = acpiphp_slot->slot;
406 int retval = 0;
407
408 info ("Slot [%s] unregistered\n", slot->hotplug_slot->name);
409
410 retval = pci_hp_deregister(slot->hotplug_slot);
411 if (retval)
412 err("pci_hp_deregister failed with error %d\n", retval);
413}
414
415
416static int __init acpiphp_init(void)
417{
418 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
419
420 acpiphp_debug = debug;
421
422 /* read all the ACPI info from the system */
423 return init_acpi();
424}
425
426
427static void __exit acpiphp_exit(void)
428{
429 /* deallocate internal data structures etc. */
430 acpiphp_glue_exit();
431}
432
433module_init(acpiphp_init);
434module_exit(acpiphp_exit);