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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 = { | |
80 | .owner = THIS_MODULE, | |
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, | |
1da177e4 LT |
88 | }; |
89 | ||
1da177e4 LT |
90 | /** |
91 | * acpiphp_register_attention - set attention LED callback | |
92 | * @info: must be completely filled with LED callbacks | |
93 | * | |
26e6c66e | 94 | * Description: This is used to register a hardware specific ACPI |
1da177e4 LT |
95 | * driver that manipulates the attention LED. All the fields in |
96 | * info must be set. | |
26e6c66e | 97 | */ |
1da177e4 LT |
98 | int acpiphp_register_attention(struct acpiphp_attention_info *info) |
99 | { | |
100 | int retval = -EINVAL; | |
101 | ||
102 | if (info && info->owner && info->set_attn && | |
103 | info->get_attn && !attention_info) { | |
104 | retval = 0; | |
105 | attention_info = info; | |
106 | } | |
107 | return retval; | |
108 | } | |
109 | ||
110 | ||
111 | /** | |
112 | * acpiphp_unregister_attention - unset attention LED callback | |
113 | * @info: must match the pointer used to register | |
114 | * | |
26e6c66e | 115 | * Description: This is used to un-register a hardware specific acpi |
1da177e4 LT |
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. | |
26e6c66e | 118 | */ |
1da177e4 LT |
119 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) |
120 | { | |
121 | int retval = -EINVAL; | |
122 | ||
123 | if (info && attention_info == info) { | |
124 | attention_info = NULL; | |
125 | retval = 0; | |
126 | } | |
127 | return retval; | |
128 | } | |
129 | ||
130 | ||
131 | /** | |
132 | * enable_slot - power on and enable a slot | |
133 | * @hotplug_slot: slot to enable | |
134 | * | |
135 | * Actual tasks are done in acpiphp_enable_slot() | |
1da177e4 LT |
136 | */ |
137 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
138 | { | |
139 | struct slot *slot = hotplug_slot->private; | |
140 | ||
df77cd10 | 141 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
142 | |
143 | /* enable the specified slot */ | |
144 | return acpiphp_enable_slot(slot->acpi_slot); | |
145 | } | |
146 | ||
147 | ||
148 | /** | |
149 | * disable_slot - disable and power off a slot | |
150 | * @hotplug_slot: slot to disable | |
151 | * | |
152 | * Actual tasks are done in acpiphp_disable_slot() | |
1da177e4 LT |
153 | */ |
154 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
155 | { | |
156 | struct slot *slot = hotplug_slot->private; | |
bfceafc5 | 157 | int retval; |
1da177e4 | 158 | |
df77cd10 | 159 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
160 | |
161 | /* disable the specified slot */ | |
bfceafc5 GH |
162 | retval = acpiphp_disable_slot(slot->acpi_slot); |
163 | if (!retval) | |
164 | retval = acpiphp_eject_slot(slot->acpi_slot); | |
165 | return retval; | |
1da177e4 LT |
166 | } |
167 | ||
168 | ||
26e6c66e RD |
169 | /** |
170 | * set_attention_status - set attention LED | |
1da177e4 LT |
171 | * @hotplug_slot: slot to set attention LED on |
172 | * @status: value to set attention LED to (0 or 1) | |
173 | * | |
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. | |
26e6c66e | 177 | */ |
1da177e4 LT |
178 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
179 | { | |
180 | int retval = -ENODEV; | |
181 | ||
df77cd10 | 182 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot)); |
1da177e4 LT |
183 | |
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); | |
187 | } else | |
188 | attention_info = NULL; | |
189 | return retval; | |
190 | } | |
191 | ||
192 | ||
193 | /** | |
194 | * get_power_status - get power status of a slot | |
195 | * @hotplug_slot: slot to get status | |
196 | * @value: pointer to store status | |
197 | * | |
198 | * Some platforms may not implement _STA method properly. | |
199 | * In that case, the value returned may not be reliable. | |
1da177e4 LT |
200 | */ |
201 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
202 | { | |
203 | struct slot *slot = hotplug_slot->private; | |
204 | ||
df77cd10 | 205 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
206 | |
207 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | ||
26e6c66e | 213 | /** |
1da177e4 LT |
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 | |
26e6c66e RD |
221 | * ACPI implementations to determine its state. |
222 | */ | |
1da177e4 LT |
223 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
224 | { | |
225 | int retval = -EINVAL; | |
226 | ||
df77cd10 | 227 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(hotplug_slot)); |
1da177e4 LT |
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. | |
26e6c66e | 244 | * Instead, we fake latch status from _STA. |
1da177e4 LT |
245 | */ |
246 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
247 | { | |
248 | struct slot *slot = hotplug_slot->private; | |
249 | ||
df77cd10 | 250 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
251 | |
252 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | ||
258 | /** | |
259 | * get_adapter_status - get adapter status of a slot | |
260 | * @hotplug_slot: slot to get status | |
261 | * @value: pointer to store status | |
262 | * | |
263 | * ACPI doesn't provide any formal means to access adapter status. | |
26e6c66e | 264 | * Instead, we fake adapter status from _STA. |
1da177e4 LT |
265 | */ |
266 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
267 | { | |
268 | struct slot *slot = hotplug_slot->private; | |
269 | ||
df77cd10 | 270 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
271 | |
272 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
1da177e4 LT |
277 | static int __init init_acpi(void) |
278 | { | |
279 | int retval; | |
280 | ||
281 | /* initialize internal data structure etc. */ | |
282 | retval = acpiphp_glue_init(); | |
283 | ||
284 | /* read initial number of slots */ | |
285 | if (!retval) { | |
286 | num_slots = acpiphp_get_num_slots(); | |
0a9dee27 AM |
287 | if (num_slots == 0) { |
288 | acpiphp_glue_exit(); | |
1da177e4 | 289 | retval = -ENODEV; |
0a9dee27 | 290 | } |
1da177e4 LT |
291 | } |
292 | ||
293 | return retval; | |
294 | } | |
295 | ||
1da177e4 LT |
296 | /** |
297 | * release_slot - free up the memory used by a slot | |
298 | * @hotplug_slot: slot to free | |
299 | */ | |
300 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
301 | { | |
302 | struct slot *slot = hotplug_slot->private; | |
303 | ||
df77cd10 | 304 | dbg("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 | 305 | |
1da177e4 LT |
306 | kfree(slot->hotplug_slot); |
307 | kfree(slot); | |
308 | } | |
309 | ||
e27da381 MT |
310 | /* callback routine to initialize 'struct slot' for each slot */ |
311 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) | |
1da177e4 LT |
312 | { |
313 | struct slot *slot; | |
314 | int retval = -ENOMEM; | |
df77cd10 | 315 | char name[SLOT_NAME_SIZE]; |
e27da381 MT |
316 | |
317 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
318 | if (!slot) | |
319 | goto error; | |
320 | ||
ac9e9891 | 321 | slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); |
e27da381 MT |
322 | if (!slot->hotplug_slot) |
323 | goto error_slot; | |
324 | ||
ac9e9891 | 325 | slot->hotplug_slot->info = &slot->info; |
e27da381 | 326 | |
e27da381 MT |
327 | slot->hotplug_slot->private = slot; |
328 | slot->hotplug_slot->release = &release_slot; | |
329 | slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; | |
330 | ||
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; | |
338 | ||
339 | acpiphp_slot->slot = slot; | |
b6adc195 | 340 | snprintf(name, SLOT_NAME_SIZE, "%llu", slot->acpi_slot->sun); |
e27da381 | 341 | |
f46753c5 AC |
342 | retval = pci_hp_register(slot->hotplug_slot, |
343 | acpiphp_slot->bridge->pci_bus, | |
1359f270 | 344 | acpiphp_slot->device, |
df77cd10 | 345 | name); |
f46753c5 AC |
346 | if (retval == -EBUSY) |
347 | goto error_hpslot; | |
e27da381 MT |
348 | if (retval) { |
349 | err("pci_hp_register failed with error %d\n", retval); | |
ac9e9891 | 350 | goto error_hpslot; |
e27da381 MT |
351 | } |
352 | ||
df77cd10 | 353 | info("Slot [%s] registered\n", slot_name(slot)); |
1da177e4 LT |
354 | |
355 | return 0; | |
1da177e4 LT |
356 | error_hpslot: |
357 | kfree(slot->hotplug_slot); | |
358 | error_slot: | |
359 | kfree(slot); | |
360 | error: | |
361 | return retval; | |
362 | } | |
363 | ||
364 | ||
e27da381 | 365 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
1da177e4 | 366 | { |
e27da381 MT |
367 | struct slot *slot = acpiphp_slot->slot; |
368 | int retval = 0; | |
1da177e4 | 369 | |
df77cd10 | 370 | info("Slot [%s] unregistered\n", slot_name(slot)); |
e27da381 MT |
371 | |
372 | retval = pci_hp_deregister(slot->hotplug_slot); | |
373 | if (retval) | |
374 | err("pci_hp_deregister failed with error %d\n", retval); | |
1da177e4 LT |
375 | } |
376 | ||
377 | ||
378 | static int __init acpiphp_init(void) | |
379 | { | |
1da177e4 LT |
380 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
381 | ||
6e4be1ff YL |
382 | if (acpi_pci_disabled) |
383 | return 0; | |
384 | ||
1da177e4 LT |
385 | acpiphp_debug = debug; |
386 | ||
387 | /* read all the ACPI info from the system */ | |
4e8662bb | 388 | return init_acpi(); |
1da177e4 LT |
389 | } |
390 | ||
391 | ||
392 | static void __exit acpiphp_exit(void) | |
393 | { | |
6e4be1ff YL |
394 | if (acpi_pci_disabled) |
395 | return; | |
396 | ||
1da177e4 LT |
397 | /* deallocate internal data structures etc. */ |
398 | acpiphp_glue_exit(); | |
399 | } | |
400 | ||
401 | module_init(acpiphp_init); | |
402 | module_exit(acpiphp_exit); |