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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 | ||
bd950799 LT |
34 | #define pr_fmt(fmt) "acpiphp: " fmt |
35 | ||
1da177e4 LT |
36 | #include <linux/init.h> |
37 | #include <linux/module.h> | |
38 | #include <linux/moduleparam.h> | |
39 | ||
40 | #include <linux/kernel.h> | |
41 | #include <linux/pci.h> | |
3b63aaa7 | 42 | #include <linux/pci-acpi.h> |
7a54f25c | 43 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
44 | #include <linux/slab.h> |
45 | #include <linux/smp.h> | |
1da177e4 LT |
46 | #include "acpiphp.h" |
47 | ||
df77cd10 AC |
48 | /* name size which is used for entries in pcihpfs */ |
49 | #define SLOT_NAME_SIZE 21 /* {_SUN} */ | |
50 | ||
6037a803 | 51 | bool acpiphp_disabled; |
1da177e4 LT |
52 | |
53 | /* local variables */ | |
1da177e4 LT |
54 | static struct acpiphp_attention_info *attention_info; |
55 | ||
42f49a6a RS |
56 | #define DRIVER_VERSION "0.5" |
57 | #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 |
58 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" |
59 | ||
60 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
61 | MODULE_DESCRIPTION(DRIVER_DESC); | |
62 | MODULE_LICENSE("GPL"); | |
6037a803 | 63 | MODULE_PARM_DESC(disable, "disable acpiphp driver"); |
6037a803 | 64 | module_param_named(disable, acpiphp_disabled, bool, 0444); |
1da177e4 | 65 | |
ff3ce480 BS |
66 | static int enable_slot(struct hotplug_slot *slot); |
67 | static int disable_slot(struct hotplug_slot *slot); | |
68 | static int set_attention_status(struct hotplug_slot *slot, u8 value); | |
69 | static int get_power_status(struct hotplug_slot *slot, u8 *value); | |
70 | static int get_attention_status(struct hotplug_slot *slot, u8 *value); | |
71 | static int get_latch_status(struct hotplug_slot *slot, u8 *value); | |
72 | static int get_adapter_status(struct hotplug_slot *slot, u8 *value); | |
1da177e4 LT |
73 | |
74 | static struct hotplug_slot_ops acpi_hotplug_slot_ops = { | |
1da177e4 LT |
75 | .enable_slot = enable_slot, |
76 | .disable_slot = disable_slot, | |
77 | .set_attention_status = set_attention_status, | |
78 | .get_power_status = get_power_status, | |
79 | .get_attention_status = get_attention_status, | |
80 | .get_latch_status = get_latch_status, | |
81 | .get_adapter_status = get_adapter_status, | |
1da177e4 LT |
82 | }; |
83 | ||
1da177e4 LT |
84 | /** |
85 | * acpiphp_register_attention - set attention LED callback | |
86 | * @info: must be completely filled with LED callbacks | |
87 | * | |
26e6c66e | 88 | * Description: This is used to register a hardware specific ACPI |
1da177e4 LT |
89 | * driver that manipulates the attention LED. All the fields in |
90 | * info must be set. | |
26e6c66e | 91 | */ |
1da177e4 LT |
92 | int acpiphp_register_attention(struct acpiphp_attention_info *info) |
93 | { | |
94 | int retval = -EINVAL; | |
95 | ||
96 | if (info && info->owner && info->set_attn && | |
97 | info->get_attn && !attention_info) { | |
98 | retval = 0; | |
99 | attention_info = info; | |
100 | } | |
101 | return retval; | |
102 | } | |
b7fe9434 | 103 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); |
1da177e4 LT |
104 | |
105 | ||
106 | /** | |
107 | * acpiphp_unregister_attention - unset attention LED callback | |
108 | * @info: must match the pointer used to register | |
109 | * | |
26e6c66e | 110 | * Description: This is used to un-register a hardware specific acpi |
f7625980 | 111 | * driver that manipulates the attention LED. The pointer to the |
1da177e4 | 112 | * info struct must be the same as the one used to set it. |
26e6c66e | 113 | */ |
1da177e4 LT |
114 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) |
115 | { | |
116 | int retval = -EINVAL; | |
117 | ||
118 | if (info && attention_info == info) { | |
119 | attention_info = NULL; | |
120 | retval = 0; | |
121 | } | |
122 | return retval; | |
123 | } | |
b7fe9434 | 124 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); |
1da177e4 LT |
125 | |
126 | ||
127 | /** | |
128 | * enable_slot - power on and enable a slot | |
129 | * @hotplug_slot: slot to enable | |
130 | * | |
131 | * Actual tasks are done in acpiphp_enable_slot() | |
1da177e4 LT |
132 | */ |
133 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
134 | { | |
135 | struct slot *slot = hotplug_slot->private; | |
136 | ||
bd950799 | 137 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
138 | |
139 | /* enable the specified slot */ | |
140 | return acpiphp_enable_slot(slot->acpi_slot); | |
141 | } | |
142 | ||
143 | ||
144 | /** | |
145 | * disable_slot - disable and power off a slot | |
146 | * @hotplug_slot: slot to disable | |
147 | * | |
148 | * Actual tasks are done in acpiphp_disable_slot() | |
1da177e4 LT |
149 | */ |
150 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
151 | { | |
152 | struct slot *slot = hotplug_slot->private; | |
153 | ||
bd950799 | 154 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
155 | |
156 | /* disable the specified slot */ | |
9217a984 | 157 | return acpiphp_disable_slot(slot->acpi_slot); |
1da177e4 LT |
158 | } |
159 | ||
160 | ||
26e6c66e RD |
161 | /** |
162 | * set_attention_status - set attention LED | |
1da177e4 LT |
163 | * @hotplug_slot: slot to set attention LED on |
164 | * @status: value to set attention LED to (0 or 1) | |
165 | * | |
166 | * attention status LED, so we use a callback that | |
167 | * was registered with us. This allows hardware specific | |
168 | * ACPI implementations to blink the light for us. | |
26e6c66e | 169 | */ |
f7625980 BH |
170 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
171 | { | |
1da177e4 LT |
172 | int retval = -ENODEV; |
173 | ||
bd950799 LT |
174 | pr_debug("%s - physical_slot = %s\n", __func__, |
175 | hotplug_slot_name(hotplug_slot)); | |
176 | ||
1da177e4 LT |
177 | if (attention_info && try_module_get(attention_info->owner)) { |
178 | retval = attention_info->set_attn(hotplug_slot, status); | |
179 | module_put(attention_info->owner); | |
180 | } else | |
181 | attention_info = NULL; | |
182 | return retval; | |
f7625980 BH |
183 | } |
184 | ||
1da177e4 LT |
185 | |
186 | /** | |
187 | * get_power_status - get power status of a slot | |
188 | * @hotplug_slot: slot to get status | |
189 | * @value: pointer to store status | |
190 | * | |
191 | * Some platforms may not implement _STA method properly. | |
192 | * In that case, the value returned may not be reliable. | |
1da177e4 LT |
193 | */ |
194 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
195 | { | |
196 | struct slot *slot = hotplug_slot->private; | |
197 | ||
bd950799 | 198 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
199 | |
200 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | ||
26e6c66e | 206 | /** |
1da177e4 LT |
207 | * get_attention_status - get attention LED status |
208 | * @hotplug_slot: slot to get status from | |
209 | * @value: returns with value of attention LED | |
210 | * | |
211 | * ACPI doesn't have known method to determine the state | |
212 | * of the attention status LED, so we use a callback that | |
213 | * was registered with us. This allows hardware specific | |
26e6c66e RD |
214 | * ACPI implementations to determine its state. |
215 | */ | |
1da177e4 LT |
216 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
217 | { | |
218 | int retval = -EINVAL; | |
219 | ||
bd950799 LT |
220 | pr_debug("%s - physical_slot = %s\n", __func__, |
221 | hotplug_slot_name(hotplug_slot)); | |
1da177e4 LT |
222 | |
223 | if (attention_info && try_module_get(attention_info->owner)) { | |
224 | retval = attention_info->get_attn(hotplug_slot, value); | |
225 | module_put(attention_info->owner); | |
226 | } else | |
227 | attention_info = NULL; | |
228 | return retval; | |
229 | } | |
230 | ||
231 | ||
232 | /** | |
233 | * get_latch_status - get latch status of a slot | |
234 | * @hotplug_slot: slot to get status | |
235 | * @value: pointer to store status | |
236 | * | |
237 | * ACPI doesn't provide any formal means to access latch status. | |
26e6c66e | 238 | * Instead, we fake latch status from _STA. |
1da177e4 LT |
239 | */ |
240 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
241 | { | |
242 | struct slot *slot = hotplug_slot->private; | |
243 | ||
bd950799 | 244 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
245 | |
246 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | ||
252 | /** | |
253 | * get_adapter_status - get adapter status of a slot | |
254 | * @hotplug_slot: slot to get status | |
255 | * @value: pointer to store status | |
256 | * | |
257 | * ACPI doesn't provide any formal means to access adapter status. | |
26e6c66e | 258 | * Instead, we fake adapter status from _STA. |
1da177e4 LT |
259 | */ |
260 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
261 | { | |
262 | struct slot *slot = hotplug_slot->private; | |
263 | ||
bd950799 | 264 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
265 | |
266 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
1da177e4 LT |
271 | /** |
272 | * release_slot - free up the memory used by a slot | |
273 | * @hotplug_slot: slot to free | |
274 | */ | |
275 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
276 | { | |
277 | struct slot *slot = hotplug_slot->private; | |
278 | ||
bd950799 | 279 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 | 280 | |
1da177e4 LT |
281 | kfree(slot->hotplug_slot); |
282 | kfree(slot); | |
283 | } | |
284 | ||
e27da381 | 285 | /* callback routine to initialize 'struct slot' for each slot */ |
7342798d RW |
286 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot, |
287 | unsigned int sun) | |
1da177e4 LT |
288 | { |
289 | struct slot *slot; | |
290 | int retval = -ENOMEM; | |
df77cd10 | 291 | char name[SLOT_NAME_SIZE]; |
e27da381 MT |
292 | |
293 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
294 | if (!slot) | |
295 | goto error; | |
296 | ||
ac9e9891 | 297 | slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL); |
e27da381 MT |
298 | if (!slot->hotplug_slot) |
299 | goto error_slot; | |
300 | ||
ac9e9891 | 301 | slot->hotplug_slot->info = &slot->info; |
e27da381 | 302 | |
e27da381 MT |
303 | slot->hotplug_slot->private = slot; |
304 | slot->hotplug_slot->release = &release_slot; | |
305 | slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; | |
306 | ||
307 | slot->acpi_slot = acpiphp_slot; | |
308 | slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); | |
309 | slot->hotplug_slot->info->attention_status = 0; | |
310 | slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); | |
311 | slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); | |
e27da381 MT |
312 | |
313 | acpiphp_slot->slot = slot; | |
7342798d RW |
314 | slot->sun = sun; |
315 | snprintf(name, SLOT_NAME_SIZE, "%u", sun); | |
e27da381 | 316 | |
bda46dbb RW |
317 | retval = pci_hp_register(slot->hotplug_slot, acpiphp_slot->bus, |
318 | acpiphp_slot->device, name); | |
f46753c5 AC |
319 | if (retval == -EBUSY) |
320 | goto error_hpslot; | |
e27da381 | 321 | if (retval) { |
bd950799 | 322 | pr_err("pci_hp_register failed with error %d\n", retval); |
ac9e9891 | 323 | goto error_hpslot; |
f7625980 | 324 | } |
e27da381 | 325 | |
bd950799 | 326 | pr_info("Slot [%s] registered\n", slot_name(slot)); |
1da177e4 LT |
327 | |
328 | return 0; | |
1da177e4 LT |
329 | error_hpslot: |
330 | kfree(slot->hotplug_slot); | |
331 | error_slot: | |
332 | kfree(slot); | |
333 | error: | |
334 | return retval; | |
335 | } | |
336 | ||
337 | ||
e27da381 | 338 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
1da177e4 | 339 | { |
e27da381 MT |
340 | struct slot *slot = acpiphp_slot->slot; |
341 | int retval = 0; | |
1da177e4 | 342 | |
bd950799 | 343 | pr_info("Slot [%s] unregistered\n", slot_name(slot)); |
e27da381 MT |
344 | |
345 | retval = pci_hp_deregister(slot->hotplug_slot); | |
346 | if (retval) | |
bd950799 | 347 | pr_err("pci_hp_deregister failed with error %d\n", retval); |
1da177e4 LT |
348 | } |
349 | ||
350 | ||
3b63aaa7 | 351 | void __init acpiphp_init(void) |
1da177e4 | 352 | { |
bd950799 | 353 | pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n", |
6037a803 JL |
354 | acpiphp_disabled ? ", disabled by user; please report a bug" |
355 | : ""); | |
1da177e4 | 356 | } |