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1 | // SPDX-License-Identifier: GPL-2.0+ | |
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 | |
11 | * Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org) | |
12 | * Copyright (C) 2003-2005 Hewlett Packard | |
13 | * | |
14 | * All rights reserved. | |
15 | * | |
16 | * Send feedback to <kristen.c.accardi@intel.com> | |
17 | * | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) "acpiphp: " fmt | |
21 | ||
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> | |
28 | #include <linux/pci-acpi.h> | |
29 | #include <linux/pci_hotplug.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/smp.h> | |
32 | #include "acpiphp.h" | |
33 | ||
34 | /* name size which is used for entries in pcihpfs */ | |
35 | #define SLOT_NAME_SIZE 21 /* {_SUN} */ | |
36 | ||
37 | bool acpiphp_disabled; | |
38 | ||
39 | /* local variables */ | |
40 | static struct acpiphp_attention_info *attention_info; | |
41 | ||
42 | #define DRIVER_VERSION "0.5" | |
43 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@infradead.org>" | |
44 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" | |
45 | ||
46 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
47 | MODULE_DESCRIPTION(DRIVER_DESC); | |
48 | MODULE_LICENSE("GPL"); | |
49 | MODULE_PARM_DESC(disable, "disable acpiphp driver"); | |
50 | module_param_named(disable, acpiphp_disabled, bool, 0444); | |
51 | ||
52 | static int enable_slot(struct hotplug_slot *slot); | |
53 | static int disable_slot(struct hotplug_slot *slot); | |
54 | static int set_attention_status(struct hotplug_slot *slot, u8 value); | |
55 | static int get_power_status(struct hotplug_slot *slot, u8 *value); | |
56 | static int get_attention_status(struct hotplug_slot *slot, u8 *value); | |
57 | static int get_latch_status(struct hotplug_slot *slot, u8 *value); | |
58 | static int get_adapter_status(struct hotplug_slot *slot, u8 *value); | |
59 | ||
60 | static const struct hotplug_slot_ops acpi_hotplug_slot_ops = { | |
61 | .enable_slot = enable_slot, | |
62 | .disable_slot = disable_slot, | |
63 | .set_attention_status = set_attention_status, | |
64 | .get_power_status = get_power_status, | |
65 | .get_attention_status = get_attention_status, | |
66 | .get_latch_status = get_latch_status, | |
67 | .get_adapter_status = get_adapter_status, | |
68 | }; | |
69 | ||
70 | /** | |
71 | * acpiphp_register_attention - set attention LED callback | |
72 | * @info: must be completely filled with LED callbacks | |
73 | * | |
74 | * Description: This is used to register a hardware specific ACPI | |
75 | * driver that manipulates the attention LED. All the fields in | |
76 | * info must be set. | |
77 | */ | |
78 | int acpiphp_register_attention(struct acpiphp_attention_info *info) | |
79 | { | |
80 | int retval = -EINVAL; | |
81 | ||
82 | if (info && info->owner && info->set_attn && | |
83 | info->get_attn && !attention_info) { | |
84 | retval = 0; | |
85 | attention_info = info; | |
86 | } | |
87 | return retval; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); | |
90 | ||
91 | ||
92 | /** | |
93 | * acpiphp_unregister_attention - unset attention LED callback | |
94 | * @info: must match the pointer used to register | |
95 | * | |
96 | * Description: This is used to un-register a hardware specific acpi | |
97 | * driver that manipulates the attention LED. The pointer to the | |
98 | * info struct must be the same as the one used to set it. | |
99 | */ | |
100 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) | |
101 | { | |
102 | int retval = -EINVAL; | |
103 | ||
104 | if (info && attention_info == info) { | |
105 | attention_info = NULL; | |
106 | retval = 0; | |
107 | } | |
108 | return retval; | |
109 | } | |
110 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); | |
111 | ||
112 | ||
113 | /** | |
114 | * enable_slot - power on and enable a slot | |
115 | * @hotplug_slot: slot to enable | |
116 | * | |
117 | * Actual tasks are done in acpiphp_enable_slot() | |
118 | */ | |
119 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
120 | { | |
121 | struct slot *slot = to_slot(hotplug_slot); | |
122 | ||
123 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); | |
124 | ||
125 | /* enable the specified slot */ | |
126 | return acpiphp_enable_slot(slot->acpi_slot); | |
127 | } | |
128 | ||
129 | ||
130 | /** | |
131 | * disable_slot - disable and power off a slot | |
132 | * @hotplug_slot: slot to disable | |
133 | * | |
134 | * Actual tasks are done in acpiphp_disable_slot() | |
135 | */ | |
136 | static int disable_slot(struct hotplug_slot *hotplug_slot) | |
137 | { | |
138 | struct slot *slot = to_slot(hotplug_slot); | |
139 | ||
140 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); | |
141 | ||
142 | /* disable the specified slot */ | |
143 | return acpiphp_disable_slot(slot->acpi_slot); | |
144 | } | |
145 | ||
146 | ||
147 | /** | |
148 | * set_attention_status - set attention LED | |
149 | * @hotplug_slot: slot to set attention LED on | |
150 | * @status: value to set attention LED to (0 or 1) | |
151 | * | |
152 | * attention status LED, so we use a callback that | |
153 | * was registered with us. This allows hardware specific | |
154 | * ACPI implementations to blink the light for us. | |
155 | */ | |
156 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
157 | { | |
158 | int retval = -ENODEV; | |
159 | ||
160 | pr_debug("%s - physical_slot = %s\n", __func__, | |
161 | hotplug_slot_name(hotplug_slot)); | |
162 | ||
163 | if (attention_info && try_module_get(attention_info->owner)) { | |
164 | retval = attention_info->set_attn(hotplug_slot, status); | |
165 | module_put(attention_info->owner); | |
166 | } else | |
167 | attention_info = NULL; | |
168 | return retval; | |
169 | } | |
170 | ||
171 | ||
172 | /** | |
173 | * get_power_status - get power status of a slot | |
174 | * @hotplug_slot: slot to get status | |
175 | * @value: pointer to store status | |
176 | * | |
177 | * Some platforms may not implement _STA method properly. | |
178 | * In that case, the value returned may not be reliable. | |
179 | */ | |
180 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
181 | { | |
182 | struct slot *slot = to_slot(hotplug_slot); | |
183 | ||
184 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); | |
185 | ||
186 | *value = acpiphp_get_power_status(slot->acpi_slot); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | ||
192 | /** | |
193 | * get_attention_status - get attention LED status | |
194 | * @hotplug_slot: slot to get status from | |
195 | * @value: returns with value of attention LED | |
196 | * | |
197 | * ACPI doesn't have known method to determine the state | |
198 | * of the attention status LED, so we use a callback that | |
199 | * was registered with us. This allows hardware specific | |
200 | * ACPI implementations to determine its state. | |
201 | */ | |
202 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
203 | { | |
204 | int retval = -EINVAL; | |
205 | ||
206 | pr_debug("%s - physical_slot = %s\n", __func__, | |
207 | hotplug_slot_name(hotplug_slot)); | |
208 | ||
209 | if (attention_info && try_module_get(attention_info->owner)) { | |
210 | retval = attention_info->get_attn(hotplug_slot, value); | |
211 | module_put(attention_info->owner); | |
212 | } else | |
213 | attention_info = NULL; | |
214 | return retval; | |
215 | } | |
216 | ||
217 | ||
218 | /** | |
219 | * get_latch_status - get latch status of a slot | |
220 | * @hotplug_slot: slot to get status | |
221 | * @value: pointer to store status | |
222 | * | |
223 | * ACPI doesn't provide any formal means to access latch status. | |
224 | * Instead, we fake latch status from _STA. | |
225 | */ | |
226 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
227 | { | |
228 | struct slot *slot = to_slot(hotplug_slot); | |
229 | ||
230 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); | |
231 | ||
232 | *value = acpiphp_get_latch_status(slot->acpi_slot); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | ||
238 | /** | |
239 | * get_adapter_status - get adapter 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 adapter status. | |
244 | * Instead, we fake adapter status from _STA. | |
245 | */ | |
246 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
247 | { | |
248 | struct slot *slot = to_slot(hotplug_slot); | |
249 | ||
250 | pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot)); | |
251 | ||
252 | *value = acpiphp_get_adapter_status(slot->acpi_slot); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | /* callback routine to initialize 'struct slot' for each slot */ | |
258 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot, | |
259 | unsigned int sun) | |
260 | { | |
261 | struct slot *slot; | |
262 | int retval = -ENOMEM; | |
263 | char name[SLOT_NAME_SIZE]; | |
264 | ||
265 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); | |
266 | if (!slot) | |
267 | goto error; | |
268 | ||
269 | slot->hotplug_slot.ops = &acpi_hotplug_slot_ops; | |
270 | ||
271 | slot->acpi_slot = acpiphp_slot; | |
272 | ||
273 | acpiphp_slot->slot = slot; | |
274 | slot->sun = sun; | |
275 | snprintf(name, SLOT_NAME_SIZE, "%u", sun); | |
276 | ||
277 | retval = pci_hp_register(&slot->hotplug_slot, acpiphp_slot->bus, | |
278 | acpiphp_slot->device, name); | |
279 | if (retval == -EBUSY) | |
280 | goto error_slot; | |
281 | if (retval) { | |
282 | pr_err("pci_hp_register failed with error %d\n", retval); | |
283 | goto error_slot; | |
284 | } | |
285 | ||
286 | pr_info("Slot [%s] registered\n", slot_name(slot)); | |
287 | ||
288 | return 0; | |
289 | error_slot: | |
290 | kfree(slot); | |
291 | error: | |
292 | return retval; | |
293 | } | |
294 | ||
295 | ||
296 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) | |
297 | { | |
298 | struct slot *slot = acpiphp_slot->slot; | |
299 | ||
300 | pr_info("Slot [%s] unregistered\n", slot_name(slot)); | |
301 | ||
302 | pci_hp_deregister(&slot->hotplug_slot); | |
303 | kfree(slot); | |
304 | } | |
305 | ||
306 | ||
307 | void __init acpiphp_init(void) | |
308 | { | |
309 | pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n", | |
310 | acpiphp_disabled ? ", disabled by user; please report a bug" | |
311 | : ""); | |
312 | } |