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736759ef | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1da177e4 LT |
2 | /* |
3 | * ACPI PCI Hot Plug Controller Driver | |
4 | * | |
5 | * Copyright (C) 1995,2001 Compaq Computer Corporation | |
6 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) | |
7 | * Copyright (C) 2001 IBM Corp. | |
8 | * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) | |
9 | * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) | |
10 | * Copyright (C) 2002,2003 NEC Corporation | |
3d0186bb | 11 | * Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org) |
42f49a6a | 12 | * Copyright (C) 2003-2005 Hewlett Packard |
1da177e4 LT |
13 | * |
14 | * All rights reserved. | |
15 | * | |
998be20f | 16 | * Send feedback to <kristen.c.accardi@intel.com> |
1da177e4 LT |
17 | * |
18 | */ | |
19 | ||
bd950799 LT |
20 | #define pr_fmt(fmt) "acpiphp: " fmt |
21 | ||
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/pci.h> | |
3b63aaa7 | 28 | #include <linux/pci-acpi.h> |
7a54f25c | 29 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
30 | #include <linux/slab.h> |
31 | #include <linux/smp.h> | |
1da177e4 LT |
32 | #include "acpiphp.h" |
33 | ||
df77cd10 AC |
34 | /* name size which is used for entries in pcihpfs */ |
35 | #define SLOT_NAME_SIZE 21 /* {_SUN} */ | |
36 | ||
6037a803 | 37 | bool acpiphp_disabled; |
1da177e4 LT |
38 | |
39 | /* local variables */ | |
1da177e4 LT |
40 | static struct acpiphp_attention_info *attention_info; |
41 | ||
42f49a6a | 42 | #define DRIVER_VERSION "0.5" |
3d0186bb | 43 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@infradead.org>" |
1da177e4 LT |
44 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" |
45 | ||
46 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
47 | MODULE_DESCRIPTION(DRIVER_DESC); | |
6037a803 | 48 | MODULE_PARM_DESC(disable, "disable acpiphp driver"); |
6037a803 | 49 | module_param_named(disable, acpiphp_disabled, bool, 0444); |
1da177e4 | 50 | |
ff3ce480 BS |
51 | static int enable_slot(struct hotplug_slot *slot); |
52 | static int disable_slot(struct hotplug_slot *slot); | |
53 | static int set_attention_status(struct hotplug_slot *slot, u8 value); | |
54 | static int get_power_status(struct hotplug_slot *slot, u8 *value); | |
55 | static int get_attention_status(struct hotplug_slot *slot, u8 *value); | |
56 | static int get_latch_status(struct hotplug_slot *slot, u8 *value); | |
57 | static int get_adapter_status(struct hotplug_slot *slot, u8 *value); | |
1da177e4 | 58 | |
81c4b5bf | 59 | static const struct hotplug_slot_ops acpi_hotplug_slot_ops = { |
1da177e4 LT |
60 | .enable_slot = enable_slot, |
61 | .disable_slot = disable_slot, | |
62 | .set_attention_status = set_attention_status, | |
63 | .get_power_status = get_power_status, | |
64 | .get_attention_status = get_attention_status, | |
65 | .get_latch_status = get_latch_status, | |
66 | .get_adapter_status = get_adapter_status, | |
1da177e4 LT |
67 | }; |
68 | ||
1da177e4 LT |
69 | /** |
70 | * acpiphp_register_attention - set attention LED callback | |
71 | * @info: must be completely filled with LED callbacks | |
72 | * | |
26e6c66e | 73 | * Description: This is used to register a hardware specific ACPI |
1da177e4 LT |
74 | * driver that manipulates the attention LED. All the fields in |
75 | * info must be set. | |
26e6c66e | 76 | */ |
1da177e4 LT |
77 | int acpiphp_register_attention(struct acpiphp_attention_info *info) |
78 | { | |
79 | int retval = -EINVAL; | |
80 | ||
33883eed | 81 | if (info && info->set_attn && info->get_attn && !attention_info) { |
1da177e4 LT |
82 | retval = 0; |
83 | attention_info = info; | |
84 | } | |
85 | return retval; | |
86 | } | |
b7fe9434 | 87 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); |
1da177e4 LT |
88 | |
89 | ||
90 | /** | |
91 | * acpiphp_unregister_attention - unset attention LED callback | |
92 | * @info: must match the pointer used to register | |
93 | * | |
26e6c66e | 94 | * Description: This is used to un-register a hardware specific acpi |
f7625980 | 95 | * driver that manipulates the attention LED. The pointer to the |
1da177e4 | 96 | * info struct must be the same as the one used to set it. |
26e6c66e | 97 | */ |
1da177e4 LT |
98 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) |
99 | { | |
100 | int retval = -EINVAL; | |
101 | ||
102 | if (info && attention_info == info) { | |
103 | attention_info = NULL; | |
104 | retval = 0; | |
105 | } | |
106 | return retval; | |
107 | } | |
b7fe9434 | 108 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); |
1da177e4 LT |
109 | |
110 | ||
111 | /** | |
112 | * enable_slot - power on and enable a slot | |
113 | * @hotplug_slot: slot to enable | |
114 | * | |
115 | * Actual tasks are done in acpiphp_enable_slot() | |
1da177e4 LT |
116 | */ |
117 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
118 | { | |
125450f8 | 119 | struct slot *slot = to_slot(hotplug_slot); |
1da177e4 | 120 | |
bd950799 | 121 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
122 | |
123 | /* enable the specified slot */ | |
124 | return acpiphp_enable_slot(slot->acpi_slot); | |
125 | } | |
126 | ||
127 | ||
128 | /** | |
129 | * disable_slot - disable and power off a slot | |
130 | * @hotplug_slot: slot to disable | |
131 | * | |
132 | * Actual tasks are done in acpiphp_disable_slot() | |
1da177e4 LT |
133 | */ |
134 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
135 | { | |
125450f8 | 136 | struct slot *slot = to_slot(hotplug_slot); |
1da177e4 | 137 | |
bd950799 | 138 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
139 | |
140 | /* disable the specified slot */ | |
9217a984 | 141 | return acpiphp_disable_slot(slot->acpi_slot); |
1da177e4 LT |
142 | } |
143 | ||
144 | ||
26e6c66e RD |
145 | /** |
146 | * set_attention_status - set attention LED | |
1da177e4 LT |
147 | * @hotplug_slot: slot to set attention LED on |
148 | * @status: value to set attention LED to (0 or 1) | |
149 | * | |
150 | * attention status LED, so we use a callback that | |
151 | * was registered with us. This allows hardware specific | |
152 | * ACPI implementations to blink the light for us. | |
26e6c66e | 153 | */ |
f7625980 BH |
154 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
155 | { | |
1da177e4 LT |
156 | int retval = -ENODEV; |
157 | ||
bd950799 LT |
158 | pr_debug("%s - physical_slot = %s\n", __func__, |
159 | hotplug_slot_name(hotplug_slot)); | |
160 | ||
1da177e4 LT |
161 | if (attention_info && try_module_get(attention_info->owner)) { |
162 | retval = attention_info->set_attn(hotplug_slot, status); | |
163 | module_put(attention_info->owner); | |
164 | } else | |
165 | attention_info = NULL; | |
166 | return retval; | |
f7625980 BH |
167 | } |
168 | ||
1da177e4 LT |
169 | |
170 | /** | |
171 | * get_power_status - get power status of a slot | |
172 | * @hotplug_slot: slot to get status | |
173 | * @value: pointer to store status | |
174 | * | |
175 | * Some platforms may not implement _STA method properly. | |
176 | * In that case, the value returned may not be reliable. | |
1da177e4 LT |
177 | */ |
178 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
179 | { | |
125450f8 | 180 | struct slot *slot = to_slot(hotplug_slot); |
1da177e4 | 181 | |
bd950799 | 182 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
183 | |
184 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | ||
26e6c66e | 190 | /** |
1da177e4 LT |
191 | * get_attention_status - get attention LED status |
192 | * @hotplug_slot: slot to get status from | |
193 | * @value: returns with value of attention LED | |
194 | * | |
195 | * ACPI doesn't have known method to determine the state | |
196 | * of the attention status LED, so we use a callback that | |
197 | * was registered with us. This allows hardware specific | |
26e6c66e RD |
198 | * ACPI implementations to determine its state. |
199 | */ | |
1da177e4 LT |
200 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
201 | { | |
202 | int retval = -EINVAL; | |
203 | ||
bd950799 LT |
204 | pr_debug("%s - physical_slot = %s\n", __func__, |
205 | hotplug_slot_name(hotplug_slot)); | |
1da177e4 LT |
206 | |
207 | if (attention_info && try_module_get(attention_info->owner)) { | |
208 | retval = attention_info->get_attn(hotplug_slot, value); | |
209 | module_put(attention_info->owner); | |
210 | } else | |
211 | attention_info = NULL; | |
212 | return retval; | |
213 | } | |
214 | ||
215 | ||
216 | /** | |
217 | * get_latch_status - get latch status of a slot | |
218 | * @hotplug_slot: slot to get status | |
219 | * @value: pointer to store status | |
220 | * | |
221 | * ACPI doesn't provide any formal means to access latch status. | |
26e6c66e | 222 | * Instead, we fake latch status from _STA. |
1da177e4 LT |
223 | */ |
224 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
225 | { | |
125450f8 | 226 | struct slot *slot = to_slot(hotplug_slot); |
1da177e4 | 227 | |
bd950799 | 228 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
229 | |
230 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | ||
236 | /** | |
237 | * get_adapter_status - get adapter 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 adapter status. | |
26e6c66e | 242 | * Instead, we fake adapter status from _STA. |
1da177e4 LT |
243 | */ |
244 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
245 | { | |
125450f8 | 246 | struct slot *slot = to_slot(hotplug_slot); |
1da177e4 | 247 | |
bd950799 | 248 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); |
1da177e4 LT |
249 | |
250 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
e27da381 | 255 | /* callback routine to initialize 'struct slot' for each slot */ |
7342798d RW |
256 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot, |
257 | unsigned int sun) | |
1da177e4 LT |
258 | { |
259 | struct slot *slot; | |
260 | int retval = -ENOMEM; | |
df77cd10 | 261 | char name[SLOT_NAME_SIZE]; |
e27da381 MT |
262 | |
263 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
264 | if (!slot) | |
265 | goto error; | |
266 | ||
125450f8 | 267 | slot->hotplug_slot.ops = &acpi_hotplug_slot_ops; |
e27da381 MT |
268 | |
269 | slot->acpi_slot = acpiphp_slot; | |
e27da381 MT |
270 | |
271 | acpiphp_slot->slot = slot; | |
7342798d RW |
272 | slot->sun = sun; |
273 | snprintf(name, SLOT_NAME_SIZE, "%u", sun); | |
e27da381 | 274 | |
125450f8 | 275 | retval = pci_hp_register(&slot->hotplug_slot, acpiphp_slot->bus, |
bda46dbb | 276 | acpiphp_slot->device, name); |
f46753c5 | 277 | if (retval == -EBUSY) |
125450f8 | 278 | goto error_slot; |
e27da381 | 279 | if (retval) { |
bd950799 | 280 | pr_err("pci_hp_register failed with error %d\n", retval); |
125450f8 | 281 | goto error_slot; |
f7625980 | 282 | } |
e27da381 | 283 | |
bd950799 | 284 | pr_info("Slot [%s] registered\n", slot_name(slot)); |
1da177e4 LT |
285 | |
286 | return 0; | |
1da177e4 LT |
287 | error_slot: |
288 | kfree(slot); | |
289 | error: | |
290 | return retval; | |
291 | } | |
292 | ||
293 | ||
e27da381 | 294 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
1da177e4 | 295 | { |
e27da381 | 296 | struct slot *slot = acpiphp_slot->slot; |
1da177e4 | 297 | |
bd950799 | 298 | pr_info("Slot [%s] unregistered\n", slot_name(slot)); |
e27da381 | 299 | |
125450f8 | 300 | pci_hp_deregister(&slot->hotplug_slot); |
51bbf9be | 301 | kfree(slot); |
1da177e4 LT |
302 | } |
303 | ||
304 | ||
3b63aaa7 | 305 | void __init acpiphp_init(void) |
1da177e4 | 306 | { |
bd950799 | 307 | pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n", |
6037a803 JL |
308 | acpiphp_disabled ? ", disabled by user; please report a bug" |
309 | : ""); | |
1da177e4 | 310 | } |