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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); | |
73 | static int get_address (struct hotplug_slot *slot, u32 *value); | |
74 | static int get_latch_status (struct hotplug_slot *slot, u8 *value); | |
75 | static int get_adapter_status (struct hotplug_slot *slot, u8 *value); | |
76 | ||
77 | static struct hotplug_slot_ops acpi_hotplug_slot_ops = { | |
78 | .owner = THIS_MODULE, | |
79 | .enable_slot = enable_slot, | |
80 | .disable_slot = disable_slot, | |
81 | .set_attention_status = set_attention_status, | |
82 | .get_power_status = get_power_status, | |
83 | .get_attention_status = get_attention_status, | |
84 | .get_latch_status = get_latch_status, | |
85 | .get_adapter_status = get_adapter_status, | |
86 | .get_address = get_address, | |
87 | }; | |
88 | ||
89 | ||
90 | /** | |
91 | * acpiphp_register_attention - set attention LED callback | |
92 | * @info: must be completely filled with LED callbacks | |
93 | * | |
94 | * Description: this is used to register a hardware specific ACPI | |
95 | * driver that manipulates the attention LED. All the fields in | |
96 | * info must be set. | |
97 | **/ | |
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 | * | |
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. | |
118 | **/ | |
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() | |
136 | * | |
137 | */ | |
138 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
139 | { | |
140 | struct slot *slot = hotplug_slot->private; | |
141 | ||
142 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
143 | ||
144 | /* enable the specified slot */ | |
145 | return acpiphp_enable_slot(slot->acpi_slot); | |
146 | } | |
147 | ||
148 | ||
149 | /** | |
150 | * disable_slot - disable and power off a slot | |
151 | * @hotplug_slot: slot to disable | |
152 | * | |
153 | * Actual tasks are done in acpiphp_disable_slot() | |
154 | * | |
155 | */ | |
156 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
157 | { | |
158 | struct slot *slot = hotplug_slot->private; | |
bfceafc5 | 159 | int retval; |
1da177e4 LT |
160 | |
161 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
162 | ||
163 | /* disable the specified slot */ | |
bfceafc5 GH |
164 | retval = acpiphp_disable_slot(slot->acpi_slot); |
165 | if (!retval) | |
166 | retval = acpiphp_eject_slot(slot->acpi_slot); | |
167 | return retval; | |
1da177e4 LT |
168 | } |
169 | ||
170 | ||
171 | /** | |
172 | * set_attention_status - set attention LED | |
173 | * @hotplug_slot: slot to set attention LED on | |
174 | * @status: value to set attention LED to (0 or 1) | |
175 | * | |
176 | * attention status LED, so we use a callback that | |
177 | * was registered with us. This allows hardware specific | |
178 | * ACPI implementations to blink the light for us. | |
179 | **/ | |
180 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
181 | { | |
182 | int retval = -ENODEV; | |
183 | ||
184 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
185 | ||
186 | if (attention_info && try_module_get(attention_info->owner)) { | |
187 | retval = attention_info->set_attn(hotplug_slot, status); | |
188 | module_put(attention_info->owner); | |
189 | } else | |
190 | attention_info = NULL; | |
191 | return retval; | |
192 | } | |
193 | ||
194 | ||
195 | /** | |
196 | * get_power_status - get power status of a slot | |
197 | * @hotplug_slot: slot to get status | |
198 | * @value: pointer to store status | |
199 | * | |
200 | * Some platforms may not implement _STA method properly. | |
201 | * In that case, the value returned may not be reliable. | |
202 | * | |
203 | */ | |
204 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
205 | { | |
206 | struct slot *slot = hotplug_slot->private; | |
207 | ||
208 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
209 | ||
210 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | ||
216 | /** | |
217 | * get_attention_status - get attention LED status | |
218 | * @hotplug_slot: slot to get status from | |
219 | * @value: returns with value of attention LED | |
220 | * | |
221 | * ACPI doesn't have known method to determine the state | |
222 | * of the attention status LED, so we use a callback that | |
223 | * was registered with us. This allows hardware specific | |
224 | * ACPI implementations to determine its state | |
225 | **/ | |
226 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
227 | { | |
228 | int retval = -EINVAL; | |
229 | ||
230 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
231 | ||
232 | if (attention_info && try_module_get(attention_info->owner)) { | |
233 | retval = attention_info->get_attn(hotplug_slot, value); | |
234 | module_put(attention_info->owner); | |
235 | } else | |
236 | attention_info = NULL; | |
237 | return retval; | |
238 | } | |
239 | ||
240 | ||
241 | /** | |
242 | * get_latch_status - get latch status of a slot | |
243 | * @hotplug_slot: slot to get status | |
244 | * @value: pointer to store status | |
245 | * | |
246 | * ACPI doesn't provide any formal means to access latch status. | |
247 | * Instead, we fake latch status from _STA | |
248 | * | |
249 | */ | |
250 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
251 | { | |
252 | struct slot *slot = hotplug_slot->private; | |
253 | ||
254 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
255 | ||
256 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | ||
262 | /** | |
263 | * get_adapter_status - get adapter status of a slot | |
264 | * @hotplug_slot: slot to get status | |
265 | * @value: pointer to store status | |
266 | * | |
267 | * ACPI doesn't provide any formal means to access adapter status. | |
268 | * Instead, we fake adapter status from _STA | |
269 | * | |
270 | */ | |
271 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
272 | { | |
273 | struct slot *slot = hotplug_slot->private; | |
274 | ||
275 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
276 | ||
277 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | ||
283 | /** | |
284 | * get_address - get pci address of a slot | |
285 | * @hotplug_slot: slot to get status | |
42f49a6a | 286 | * @value: pointer to struct pci_busdev (seg, bus, dev) |
1da177e4 LT |
287 | */ |
288 | static int get_address(struct hotplug_slot *hotplug_slot, u32 *value) | |
289 | { | |
290 | struct slot *slot = hotplug_slot->private; | |
291 | ||
292 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
293 | ||
294 | *value = acpiphp_get_address(slot->acpi_slot); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static int __init init_acpi(void) | |
300 | { | |
301 | int retval; | |
302 | ||
303 | /* initialize internal data structure etc. */ | |
304 | retval = acpiphp_glue_init(); | |
305 | ||
306 | /* read initial number of slots */ | |
307 | if (!retval) { | |
308 | num_slots = acpiphp_get_num_slots(); | |
0a9dee27 AM |
309 | if (num_slots == 0) { |
310 | acpiphp_glue_exit(); | |
1da177e4 | 311 | retval = -ENODEV; |
0a9dee27 | 312 | } |
1da177e4 LT |
313 | } |
314 | ||
315 | return retval; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /** |
319 | * release_slot - free up the memory used by a slot | |
320 | * @hotplug_slot: slot to free | |
321 | */ | |
322 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
323 | { | |
324 | struct slot *slot = hotplug_slot->private; | |
325 | ||
326 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); | |
327 | ||
1da177e4 LT |
328 | kfree(slot->hotplug_slot); |
329 | kfree(slot); | |
330 | } | |
331 | ||
e27da381 MT |
332 | /* callback routine to initialize 'struct slot' for each slot */ |
333 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) | |
1da177e4 LT |
334 | { |
335 | struct slot *slot; | |
336 | int retval = -ENOMEM; | |
e27da381 MT |
337 | |
338 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
339 | if (!slot) | |
340 | goto error; | |
341 | ||
ac9e9891 | 342 | slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); |
e27da381 MT |
343 | if (!slot->hotplug_slot) |
344 | goto error_slot; | |
345 | ||
ac9e9891 | 346 | slot->hotplug_slot->info = &slot->info; |
e27da381 | 347 | |
ac9e9891 | 348 | slot->hotplug_slot->name = slot->name; |
e27da381 MT |
349 | |
350 | slot->hotplug_slot->private = slot; | |
351 | slot->hotplug_slot->release = &release_slot; | |
352 | slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; | |
353 | ||
354 | slot->acpi_slot = acpiphp_slot; | |
355 | slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); | |
356 | slot->hotplug_slot->info->attention_status = 0; | |
357 | slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); | |
358 | slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); | |
359 | slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN; | |
360 | slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN; | |
361 | ||
362 | acpiphp_slot->slot = slot; | |
ac9e9891 | 363 | snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun); |
e27da381 MT |
364 | |
365 | retval = pci_hp_register(slot->hotplug_slot); | |
366 | if (retval) { | |
367 | err("pci_hp_register failed with error %d\n", retval); | |
ac9e9891 | 368 | goto error_hpslot; |
e27da381 MT |
369 | } |
370 | ||
371 | info("Slot [%s] registered\n", slot->hotplug_slot->name); | |
1da177e4 LT |
372 | |
373 | return 0; | |
1da177e4 LT |
374 | error_hpslot: |
375 | kfree(slot->hotplug_slot); | |
376 | error_slot: | |
377 | kfree(slot); | |
378 | error: | |
379 | return retval; | |
380 | } | |
381 | ||
382 | ||
e27da381 | 383 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
1da177e4 | 384 | { |
e27da381 MT |
385 | struct slot *slot = acpiphp_slot->slot; |
386 | int retval = 0; | |
1da177e4 | 387 | |
e27da381 MT |
388 | info ("Slot [%s] unregistered\n", slot->hotplug_slot->name); |
389 | ||
390 | retval = pci_hp_deregister(slot->hotplug_slot); | |
391 | if (retval) | |
392 | err("pci_hp_deregister failed with error %d\n", retval); | |
1da177e4 LT |
393 | } |
394 | ||
395 | ||
396 | static int __init acpiphp_init(void) | |
397 | { | |
1da177e4 LT |
398 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
399 | ||
400 | acpiphp_debug = debug; | |
401 | ||
402 | /* read all the ACPI info from the system */ | |
4e8662bb | 403 | return init_acpi(); |
1da177e4 LT |
404 | } |
405 | ||
406 | ||
407 | static void __exit acpiphp_exit(void) | |
408 | { | |
1da177e4 LT |
409 | /* deallocate internal data structures etc. */ |
410 | acpiphp_glue_exit(); | |
411 | } | |
412 | ||
413 | module_init(acpiphp_init); | |
414 | module_exit(acpiphp_exit); |