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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 | ||
47 | static int debug; | |
48 | int acpiphp_debug; | |
49 | ||
50 | /* local variables */ | |
51 | static int num_slots; | |
52 | static struct acpiphp_attention_info *attention_info; | |
53 | ||
42f49a6a RS |
54 | #define DRIVER_VERSION "0.5" |
55 | #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 |
56 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" |
57 | ||
58 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
59 | MODULE_DESCRIPTION(DRIVER_DESC); | |
60 | MODULE_LICENSE("GPL"); | |
61 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); | |
62 | module_param(debug, bool, 0644); | |
63 | ||
64 | /* export the attention callback registration methods */ | |
65 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); | |
66 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); | |
67 | ||
68 | static int enable_slot (struct hotplug_slot *slot); | |
69 | static int disable_slot (struct hotplug_slot *slot); | |
70 | static int set_attention_status (struct hotplug_slot *slot, u8 value); | |
71 | static int get_power_status (struct hotplug_slot *slot, u8 *value); | |
72 | static int get_attention_status (struct hotplug_slot *slot, u8 *value); | |
1da177e4 LT |
73 | static int get_latch_status (struct hotplug_slot *slot, u8 *value); |
74 | static int get_adapter_status (struct hotplug_slot *slot, u8 *value); | |
75 | ||
76 | static struct hotplug_slot_ops acpi_hotplug_slot_ops = { | |
77 | .owner = THIS_MODULE, | |
78 | .enable_slot = enable_slot, | |
79 | .disable_slot = disable_slot, | |
80 | .set_attention_status = set_attention_status, | |
81 | .get_power_status = get_power_status, | |
82 | .get_attention_status = get_attention_status, | |
83 | .get_latch_status = get_latch_status, | |
84 | .get_adapter_status = get_adapter_status, | |
1da177e4 LT |
85 | }; |
86 | ||
87 | ||
88 | /** | |
89 | * acpiphp_register_attention - set attention LED callback | |
90 | * @info: must be completely filled with LED callbacks | |
91 | * | |
26e6c66e | 92 | * Description: This is used to register a hardware specific ACPI |
1da177e4 LT |
93 | * driver that manipulates the attention LED. All the fields in |
94 | * info must be set. | |
26e6c66e | 95 | */ |
1da177e4 LT |
96 | int acpiphp_register_attention(struct acpiphp_attention_info *info) |
97 | { | |
98 | int retval = -EINVAL; | |
99 | ||
100 | if (info && info->owner && info->set_attn && | |
101 | info->get_attn && !attention_info) { | |
102 | retval = 0; | |
103 | attention_info = info; | |
104 | } | |
105 | return retval; | |
106 | } | |
107 | ||
108 | ||
109 | /** | |
110 | * acpiphp_unregister_attention - unset attention LED callback | |
111 | * @info: must match the pointer used to register | |
112 | * | |
26e6c66e | 113 | * Description: This is used to un-register a hardware specific acpi |
1da177e4 LT |
114 | * driver that manipulates the attention LED. The pointer to the |
115 | * info struct must be the same as the one used to set it. | |
26e6c66e | 116 | */ |
1da177e4 LT |
117 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) |
118 | { | |
119 | int retval = -EINVAL; | |
120 | ||
121 | if (info && attention_info == info) { | |
122 | attention_info = NULL; | |
123 | retval = 0; | |
124 | } | |
125 | return retval; | |
126 | } | |
127 | ||
128 | ||
129 | /** | |
130 | * enable_slot - power on and enable a slot | |
131 | * @hotplug_slot: slot to enable | |
132 | * | |
133 | * Actual tasks are done in acpiphp_enable_slot() | |
1da177e4 LT |
134 | */ |
135 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
136 | { | |
137 | struct slot *slot = hotplug_slot->private; | |
138 | ||
66bef8c0 | 139 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
140 | |
141 | /* enable the specified slot */ | |
142 | return acpiphp_enable_slot(slot->acpi_slot); | |
143 | } | |
144 | ||
145 | ||
146 | /** | |
147 | * disable_slot - disable and power off a slot | |
148 | * @hotplug_slot: slot to disable | |
149 | * | |
150 | * Actual tasks are done in acpiphp_disable_slot() | |
1da177e4 LT |
151 | */ |
152 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
153 | { | |
154 | struct slot *slot = hotplug_slot->private; | |
bfceafc5 | 155 | int retval; |
1da177e4 | 156 | |
66bef8c0 | 157 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
158 | |
159 | /* disable the specified slot */ | |
bfceafc5 GH |
160 | retval = acpiphp_disable_slot(slot->acpi_slot); |
161 | if (!retval) | |
162 | retval = acpiphp_eject_slot(slot->acpi_slot); | |
163 | return retval; | |
1da177e4 LT |
164 | } |
165 | ||
166 | ||
26e6c66e RD |
167 | /** |
168 | * set_attention_status - set attention LED | |
1da177e4 LT |
169 | * @hotplug_slot: slot to set attention LED on |
170 | * @status: value to set attention LED to (0 or 1) | |
171 | * | |
172 | * attention status LED, so we use a callback that | |
173 | * was registered with us. This allows hardware specific | |
174 | * ACPI implementations to blink the light for us. | |
26e6c66e | 175 | */ |
1da177e4 LT |
176 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
177 | { | |
178 | int retval = -ENODEV; | |
179 | ||
66bef8c0 | 180 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
181 | |
182 | if (attention_info && try_module_get(attention_info->owner)) { | |
183 | retval = attention_info->set_attn(hotplug_slot, status); | |
184 | module_put(attention_info->owner); | |
185 | } else | |
186 | attention_info = NULL; | |
187 | return retval; | |
188 | } | |
189 | ||
190 | ||
191 | /** | |
192 | * get_power_status - get power status of a slot | |
193 | * @hotplug_slot: slot to get status | |
194 | * @value: pointer to store status | |
195 | * | |
196 | * Some platforms may not implement _STA method properly. | |
197 | * In that case, the value returned may not be reliable. | |
1da177e4 LT |
198 | */ |
199 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
200 | { | |
201 | struct slot *slot = hotplug_slot->private; | |
202 | ||
66bef8c0 | 203 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
204 | |
205 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | ||
26e6c66e | 211 | /** |
1da177e4 LT |
212 | * get_attention_status - get attention LED status |
213 | * @hotplug_slot: slot to get status from | |
214 | * @value: returns with value of attention LED | |
215 | * | |
216 | * ACPI doesn't have known method to determine the state | |
217 | * of the attention status LED, so we use a callback that | |
218 | * was registered with us. This allows hardware specific | |
26e6c66e RD |
219 | * ACPI implementations to determine its state. |
220 | */ | |
1da177e4 LT |
221 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
222 | { | |
223 | int retval = -EINVAL; | |
224 | ||
66bef8c0 | 225 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
226 | |
227 | if (attention_info && try_module_get(attention_info->owner)) { | |
228 | retval = attention_info->get_attn(hotplug_slot, value); | |
229 | module_put(attention_info->owner); | |
230 | } else | |
231 | attention_info = NULL; | |
232 | return retval; | |
233 | } | |
234 | ||
235 | ||
236 | /** | |
237 | * get_latch_status - get latch status of a slot | |
238 | * @hotplug_slot: slot to get status | |
239 | * @value: pointer to store status | |
240 | * | |
241 | * ACPI doesn't provide any formal means to access latch status. | |
26e6c66e | 242 | * Instead, we fake latch status from _STA. |
1da177e4 LT |
243 | */ |
244 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
245 | { | |
246 | struct slot *slot = hotplug_slot->private; | |
247 | ||
66bef8c0 | 248 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
249 | |
250 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | ||
256 | /** | |
257 | * get_adapter_status - get adapter status of a slot | |
258 | * @hotplug_slot: slot to get status | |
259 | * @value: pointer to store status | |
260 | * | |
261 | * ACPI doesn't provide any formal means to access adapter status. | |
26e6c66e | 262 | * Instead, we fake adapter status from _STA. |
1da177e4 LT |
263 | */ |
264 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
265 | { | |
266 | struct slot *slot = hotplug_slot->private; | |
267 | ||
66bef8c0 | 268 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
269 | |
270 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
1da177e4 LT |
275 | static int __init init_acpi(void) |
276 | { | |
277 | int retval; | |
278 | ||
279 | /* initialize internal data structure etc. */ | |
280 | retval = acpiphp_glue_init(); | |
281 | ||
282 | /* read initial number of slots */ | |
283 | if (!retval) { | |
284 | num_slots = acpiphp_get_num_slots(); | |
0a9dee27 AM |
285 | if (num_slots == 0) { |
286 | acpiphp_glue_exit(); | |
1da177e4 | 287 | retval = -ENODEV; |
0a9dee27 | 288 | } |
1da177e4 LT |
289 | } |
290 | ||
291 | return retval; | |
292 | } | |
293 | ||
1da177e4 LT |
294 | /** |
295 | * release_slot - free up the memory used by a slot | |
296 | * @hotplug_slot: slot to free | |
297 | */ | |
298 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
299 | { | |
300 | struct slot *slot = hotplug_slot->private; | |
301 | ||
66bef8c0 | 302 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 | 303 | |
1da177e4 LT |
304 | kfree(slot->hotplug_slot); |
305 | kfree(slot); | |
306 | } | |
307 | ||
e27da381 MT |
308 | /* callback routine to initialize 'struct slot' for each slot */ |
309 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) | |
1da177e4 LT |
310 | { |
311 | struct slot *slot; | |
312 | int retval = -ENOMEM; | |
e27da381 MT |
313 | |
314 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
315 | if (!slot) | |
316 | goto error; | |
317 | ||
ac9e9891 | 318 | slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); |
e27da381 MT |
319 | if (!slot->hotplug_slot) |
320 | goto error_slot; | |
321 | ||
ac9e9891 | 322 | slot->hotplug_slot->info = &slot->info; |
e27da381 | 323 | |
ac9e9891 | 324 | slot->hotplug_slot->name = slot->name; |
e27da381 MT |
325 | |
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; | |
ac9e9891 | 339 | snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun); |
e27da381 | 340 | |
f46753c5 AC |
341 | retval = pci_hp_register(slot->hotplug_slot, |
342 | acpiphp_slot->bridge->pci_bus, | |
343 | acpiphp_slot->device); | |
344 | if (retval == -EBUSY) | |
345 | goto error_hpslot; | |
e27da381 MT |
346 | if (retval) { |
347 | err("pci_hp_register failed with error %d\n", retval); | |
ac9e9891 | 348 | goto error_hpslot; |
e27da381 MT |
349 | } |
350 | ||
351 | info("Slot [%s] registered\n", slot->hotplug_slot->name); | |
1da177e4 LT |
352 | |
353 | return 0; | |
1da177e4 LT |
354 | error_hpslot: |
355 | kfree(slot->hotplug_slot); | |
356 | error_slot: | |
357 | kfree(slot); | |
358 | error: | |
359 | return retval; | |
360 | } | |
361 | ||
362 | ||
e27da381 | 363 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
1da177e4 | 364 | { |
e27da381 MT |
365 | struct slot *slot = acpiphp_slot->slot; |
366 | int retval = 0; | |
1da177e4 | 367 | |
e27da381 MT |
368 | info ("Slot [%s] unregistered\n", slot->hotplug_slot->name); |
369 | ||
370 | retval = pci_hp_deregister(slot->hotplug_slot); | |
371 | if (retval) | |
372 | err("pci_hp_deregister failed with error %d\n", retval); | |
1da177e4 LT |
373 | } |
374 | ||
375 | ||
376 | static int __init acpiphp_init(void) | |
377 | { | |
1da177e4 LT |
378 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
379 | ||
6e4be1ff YL |
380 | if (acpi_pci_disabled) |
381 | return 0; | |
382 | ||
1da177e4 LT |
383 | acpiphp_debug = debug; |
384 | ||
385 | /* read all the ACPI info from the system */ | |
4e8662bb | 386 | return init_acpi(); |
1da177e4 LT |
387 | } |
388 | ||
389 | ||
390 | static void __exit acpiphp_exit(void) | |
391 | { | |
6e4be1ff YL |
392 | if (acpi_pci_disabled) |
393 | return; | |
394 | ||
1da177e4 LT |
395 | /* deallocate internal data structures etc. */ |
396 | acpiphp_glue_exit(); | |
397 | } | |
398 | ||
399 | module_init(acpiphp_init); | |
400 | module_exit(acpiphp_exit); |