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1da177e4 LT |
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 | |
42f49a6a RS |
10 | * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) |
11 | * Copyright (C) 2003-2005 Hewlett Packard | |
1da177e4 LT |
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 | * | |
998be20f | 30 | * Send feedback to <kristen.c.accardi@intel.com> |
1da177e4 LT |
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> | |
7a54f25c | 40 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
41 | #include <linux/slab.h> |
42 | #include <linux/smp.h> | |
1da177e4 LT |
43 | #include "acpiphp.h" |
44 | ||
1da177e4 LT |
45 | #define MY_NAME "acpiphp" |
46 | ||
df77cd10 AC |
47 | /* name size which is used for entries in pcihpfs */ |
48 | #define SLOT_NAME_SIZE 21 /* {_SUN} */ | |
49 | ||
1da177e4 LT |
50 | static int debug; |
51 | int acpiphp_debug; | |
52 | ||
53 | /* local variables */ | |
54 | static int num_slots; | |
55 | static struct acpiphp_attention_info *attention_info; | |
56 | ||
42f49a6a RS |
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>" | |
1da177e4 LT |
59 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" |
60 | ||
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); | |
66 | ||
67 | /* export the attention callback registration methods */ | |
68 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); | |
69 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); | |
70 | ||
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); | |
1da177e4 LT |
76 | static int get_latch_status (struct hotplug_slot *slot, u8 *value); |
77 | static int get_adapter_status (struct hotplug_slot *slot, u8 *value); | |
78 | ||
79 | static struct hotplug_slot_ops acpi_hotplug_slot_ops = { | |
1da177e4 LT |
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, | |
1da177e4 LT |
87 | }; |
88 | ||
1da177e4 LT |
89 | /** |
90 | * acpiphp_register_attention - set attention LED callback | |
91 | * @info: must be completely filled with LED callbacks | |
92 | * | |
26e6c66e | 93 | * Description: This is used to register a hardware specific ACPI |
1da177e4 LT |
94 | * driver that manipulates the attention LED. All the fields in |
95 | * info must be set. | |
26e6c66e | 96 | */ |
1da177e4 LT |
97 | int acpiphp_register_attention(struct acpiphp_attention_info *info) |
98 | { | |
99 | int retval = -EINVAL; | |
100 | ||
101 | if (info && info->owner && info->set_attn && | |
102 | info->get_attn && !attention_info) { | |
103 | retval = 0; | |
104 | attention_info = info; | |
105 | } | |
106 | return retval; | |
107 | } | |
108 | ||
109 | ||
110 | /** | |
111 | * acpiphp_unregister_attention - unset attention LED callback | |
112 | * @info: must match the pointer used to register | |
113 | * | |
26e6c66e | 114 | * Description: This is used to un-register a hardware specific acpi |
1da177e4 LT |
115 | * driver that manipulates the attention LED. The pointer to the |
116 | * info struct must be the same as the one used to set it. | |
26e6c66e | 117 | */ |
1da177e4 LT |
118 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) |
119 | { | |
120 | int retval = -EINVAL; | |
121 | ||
122 | if (info && attention_info == info) { | |
123 | attention_info = NULL; | |
124 | retval = 0; | |
125 | } | |
126 | return retval; | |
127 | } | |
128 | ||
129 | ||
130 | /** | |
131 | * enable_slot - power on and enable a slot | |
132 | * @hotplug_slot: slot to enable | |
133 | * | |
134 | * Actual tasks are done in acpiphp_enable_slot() | |
1da177e4 LT |
135 | */ |
136 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
137 | { | |
138 | struct slot *slot = hotplug_slot->private; | |
139 | ||
df77cd10 | 140 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
141 | |
142 | /* enable the specified slot */ | |
143 | return acpiphp_enable_slot(slot->acpi_slot); | |
144 | } | |
145 | ||
146 | ||
147 | /** | |
148 | * disable_slot - disable and power off a slot | |
149 | * @hotplug_slot: slot to disable | |
150 | * | |
151 | * Actual tasks are done in acpiphp_disable_slot() | |
1da177e4 LT |
152 | */ |
153 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
154 | { | |
155 | struct slot *slot = hotplug_slot->private; | |
bfceafc5 | 156 | int retval; |
1da177e4 | 157 | |
df77cd10 | 158 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
159 | |
160 | /* disable the specified slot */ | |
bfceafc5 GH |
161 | retval = acpiphp_disable_slot(slot->acpi_slot); |
162 | if (!retval) | |
163 | retval = acpiphp_eject_slot(slot->acpi_slot); | |
164 | return retval; | |
1da177e4 LT |
165 | } |
166 | ||
167 | ||
26e6c66e RD |
168 | /** |
169 | * set_attention_status - set attention LED | |
1da177e4 LT |
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. | |
26e6c66e | 176 | */ |
1da177e4 LT |
177 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
178 | { | |
179 | int retval = -ENODEV; | |
180 | ||
df77cd10 | 181 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot)); |
1da177e4 LT |
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. | |
1da177e4 LT |
199 | */ |
200 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
201 | { | |
202 | struct slot *slot = hotplug_slot->private; | |
203 | ||
df77cd10 | 204 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
205 | |
206 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | ||
26e6c66e | 212 | /** |
1da177e4 LT |
213 | * get_attention_status - get attention LED status |
214 | * @hotplug_slot: slot to get status from | |
215 | * @value: returns with value of attention LED | |
216 | * | |
217 | * ACPI doesn't have known method to determine the state | |
218 | * of the attention status LED, so we use a callback that | |
219 | * was registered with us. This allows hardware specific | |
26e6c66e RD |
220 | * ACPI implementations to determine its state. |
221 | */ | |
1da177e4 LT |
222 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
223 | { | |
224 | int retval = -EINVAL; | |
225 | ||
df77cd10 | 226 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot)); |
1da177e4 LT |
227 | |
228 | if (attention_info && try_module_get(attention_info->owner)) { | |
229 | retval = attention_info->get_attn(hotplug_slot, value); | |
230 | module_put(attention_info->owner); | |
231 | } else | |
232 | attention_info = NULL; | |
233 | return retval; | |
234 | } | |
235 | ||
236 | ||
237 | /** | |
238 | * get_latch_status - get latch status of a slot | |
239 | * @hotplug_slot: slot to get status | |
240 | * @value: pointer to store status | |
241 | * | |
242 | * ACPI doesn't provide any formal means to access latch status. | |
26e6c66e | 243 | * Instead, we fake latch status from _STA. |
1da177e4 LT |
244 | */ |
245 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
246 | { | |
247 | struct slot *slot = hotplug_slot->private; | |
248 | ||
df77cd10 | 249 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
250 | |
251 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | ||
257 | /** | |
258 | * get_adapter_status - get adapter status of a slot | |
259 | * @hotplug_slot: slot to get status | |
260 | * @value: pointer to store status | |
261 | * | |
262 | * ACPI doesn't provide any formal means to access adapter status. | |
26e6c66e | 263 | * Instead, we fake adapter status from _STA. |
1da177e4 LT |
264 | */ |
265 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
266 | { | |
267 | struct slot *slot = hotplug_slot->private; | |
268 | ||
df77cd10 | 269 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
270 | |
271 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
1da177e4 LT |
276 | static int __init init_acpi(void) |
277 | { | |
278 | int retval; | |
279 | ||
280 | /* initialize internal data structure etc. */ | |
281 | retval = acpiphp_glue_init(); | |
282 | ||
283 | /* read initial number of slots */ | |
284 | if (!retval) { | |
285 | num_slots = acpiphp_get_num_slots(); | |
0a9dee27 AM |
286 | if (num_slots == 0) { |
287 | acpiphp_glue_exit(); | |
1da177e4 | 288 | retval = -ENODEV; |
0a9dee27 | 289 | } |
1da177e4 LT |
290 | } |
291 | ||
292 | return retval; | |
293 | } | |
294 | ||
1da177e4 LT |
295 | /** |
296 | * release_slot - free up the memory used by a slot | |
297 | * @hotplug_slot: slot to free | |
298 | */ | |
299 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
300 | { | |
301 | struct slot *slot = hotplug_slot->private; | |
302 | ||
df77cd10 | 303 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 | 304 | |
1da177e4 LT |
305 | kfree(slot->hotplug_slot); |
306 | kfree(slot); | |
307 | } | |
308 | ||
e27da381 MT |
309 | /* callback routine to initialize 'struct slot' for each slot */ |
310 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) | |
1da177e4 LT |
311 | { |
312 | struct slot *slot; | |
313 | int retval = -ENOMEM; | |
df77cd10 | 314 | char name[SLOT_NAME_SIZE]; |
e27da381 MT |
315 | |
316 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
317 | if (!slot) | |
318 | goto error; | |
319 | ||
ac9e9891 | 320 | slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); |
e27da381 MT |
321 | if (!slot->hotplug_slot) |
322 | goto error_slot; | |
323 | ||
ac9e9891 | 324 | slot->hotplug_slot->info = &slot->info; |
e27da381 | 325 | |
e27da381 MT |
326 | slot->hotplug_slot->private = slot; |
327 | slot->hotplug_slot->release = &release_slot; | |
328 | slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; | |
329 | ||
330 | slot->acpi_slot = acpiphp_slot; | |
331 | slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); | |
332 | slot->hotplug_slot->info->attention_status = 0; | |
333 | slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); | |
334 | slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); | |
335 | slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN; | |
336 | slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
337 | ||
338 | acpiphp_slot->slot = slot; | |
b6adc195 | 339 | snprintf(name, SLOT_NAME_SIZE, "%llu", slot->acpi_slot->sun); |
e27da381 | 340 | |
f46753c5 AC |
341 | retval = pci_hp_register(slot->hotplug_slot, |
342 | acpiphp_slot->bridge->pci_bus, | |
1359f270 | 343 | acpiphp_slot->device, |
df77cd10 | 344 | name); |
f46753c5 AC |
345 | if (retval == -EBUSY) |
346 | goto error_hpslot; | |
e27da381 MT |
347 | if (retval) { |
348 | err("pci_hp_register failed with error %d\n", retval); | |
ac9e9891 | 349 | goto error_hpslot; |
e27da381 MT |
350 | } |
351 | ||
df77cd10 | 352 | info("Slot [%s] registered\n", slot_name(slot)); |
1da177e4 LT |
353 | |
354 | return 0; | |
1da177e4 LT |
355 | error_hpslot: |
356 | kfree(slot->hotplug_slot); | |
357 | error_slot: | |
358 | kfree(slot); | |
359 | error: | |
360 | return retval; | |
361 | } | |
362 | ||
363 | ||
e27da381 | 364 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
1da177e4 | 365 | { |
e27da381 MT |
366 | struct slot *slot = acpiphp_slot->slot; |
367 | int retval = 0; | |
1da177e4 | 368 | |
df77cd10 | 369 | info("Slot [%s] unregistered\n", slot_name(slot)); |
e27da381 MT |
370 | |
371 | retval = pci_hp_deregister(slot->hotplug_slot); | |
372 | if (retval) | |
373 | err("pci_hp_deregister failed with error %d\n", retval); | |
1da177e4 LT |
374 | } |
375 | ||
376 | ||
377 | static int __init acpiphp_init(void) | |
378 | { | |
1da177e4 LT |
379 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
380 | ||
6e4be1ff YL |
381 | if (acpi_pci_disabled) |
382 | return 0; | |
383 | ||
1da177e4 LT |
384 | acpiphp_debug = debug; |
385 | ||
386 | /* read all the ACPI info from the system */ | |
4e8662bb | 387 | return init_acpi(); |
1da177e4 LT |
388 | } |
389 | ||
390 | ||
391 | static void __exit acpiphp_exit(void) | |
392 | { | |
6e4be1ff YL |
393 | if (acpi_pci_disabled) |
394 | return; | |
395 | ||
1da177e4 LT |
396 | /* deallocate internal data structures etc. */ |
397 | acpiphp_glue_exit(); | |
398 | } | |
399 | ||
400 | module_init(acpiphp_init); | |
401 | module_exit(acpiphp_exit); |