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1da177e4 | 1 | /* |
753388c2 | 2 | * PCI Hot Plug Controller Skeleton Driver - 0.3 |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com) | |
5 | * Copyright (C) 2001,2003 IBM Corp. | |
6 | * | |
7 | * All rights reserved. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
17 | * NON INFRINGEMENT. See the GNU General Public License for more | |
18 | * details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | * | |
753388c2 | 24 | * This driver is to be used as a skeleton driver to show how to interface |
1da177e4 LT |
25 | * with the pci hotplug core easily. |
26 | * | |
27 | * Send feedback to <greg@kroah.com> | |
28 | * | |
29 | */ | |
30 | ||
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/moduleparam.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
7a54f25c | 36 | #include <linux/pci_hotplug.h> |
1da177e4 | 37 | #include <linux/init.h> |
1da177e4 | 38 | |
287588b3 | 39 | #define SLOT_NAME_SIZE 10 |
1da177e4 LT |
40 | struct slot { |
41 | u8 number; | |
42 | struct hotplug_slot *hotplug_slot; | |
43 | struct list_head slot_list; | |
287588b3 | 44 | char name[SLOT_NAME_SIZE]; |
1da177e4 LT |
45 | }; |
46 | ||
47 | static LIST_HEAD(slot_list); | |
48 | ||
49 | #define MY_NAME "pcihp_skeleton" | |
50 | ||
51 | #define dbg(format, arg...) \ | |
52 | do { \ | |
53 | if (debug) \ | |
54 | printk (KERN_DEBUG "%s: " format "\n", \ | |
55 | MY_NAME , ## arg); \ | |
56 | } while (0) | |
57 | #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg) | |
58 | #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg) | |
59 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg) | |
60 | ||
1da177e4 LT |
61 | /* local variables */ |
62 | static int debug; | |
63 | static int num_slots; | |
64 | ||
65 | #define DRIVER_VERSION "0.3" | |
66 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>" | |
67 | #define DRIVER_DESC "Hot Plug PCI Controller Skeleton Driver" | |
68 | ||
69 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
70 | MODULE_DESCRIPTION(DRIVER_DESC); | |
71 | MODULE_LICENSE("GPL"); | |
72 | module_param(debug, bool, 0644); | |
73 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); | |
74 | ||
75 | static int enable_slot (struct hotplug_slot *slot); | |
76 | static int disable_slot (struct hotplug_slot *slot); | |
77 | static int set_attention_status (struct hotplug_slot *slot, u8 value); | |
78 | static int hardware_test (struct hotplug_slot *slot, u32 value); | |
79 | static int get_power_status (struct hotplug_slot *slot, u8 *value); | |
80 | static int get_attention_status (struct hotplug_slot *slot, u8 *value); | |
81 | static int get_latch_status (struct hotplug_slot *slot, u8 *value); | |
82 | static int get_adapter_status (struct hotplug_slot *slot, u8 *value); | |
83 | ||
84 | static struct hotplug_slot_ops skel_hotplug_slot_ops = { | |
1da177e4 LT |
85 | .enable_slot = enable_slot, |
86 | .disable_slot = disable_slot, | |
87 | .set_attention_status = set_attention_status, | |
88 | .hardware_test = hardware_test, | |
89 | .get_power_status = get_power_status, | |
90 | .get_attention_status = get_attention_status, | |
91 | .get_latch_status = get_latch_status, | |
92 | .get_adapter_status = get_adapter_status, | |
93 | }; | |
94 | ||
95 | static int enable_slot(struct hotplug_slot *hotplug_slot) | |
96 | { | |
97 | struct slot *slot = hotplug_slot->private; | |
98 | int retval = 0; | |
99 | ||
66bef8c0 | 100 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
101 | |
102 | /* | |
103 | * Fill in code here to enable the specified slot | |
104 | */ | |
105 | ||
106 | return retval; | |
107 | } | |
108 | ||
1da177e4 LT |
109 | static int disable_slot(struct hotplug_slot *hotplug_slot) |
110 | { | |
111 | struct slot *slot = hotplug_slot->private; | |
112 | int retval = 0; | |
113 | ||
66bef8c0 | 114 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
115 | |
116 | /* | |
117 | * Fill in code here to disable the specified slot | |
118 | */ | |
119 | ||
120 | return retval; | |
121 | } | |
122 | ||
123 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
124 | { | |
125 | struct slot *slot = hotplug_slot->private; | |
126 | int retval = 0; | |
127 | ||
66bef8c0 | 128 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
129 | |
130 | switch (status) { | |
131 | case 0: | |
132 | /* | |
133 | * Fill in code here to turn light off | |
134 | */ | |
135 | break; | |
136 | ||
137 | case 1: | |
138 | default: | |
139 | /* | |
140 | * Fill in code here to turn light on | |
141 | */ | |
142 | break; | |
143 | } | |
144 | ||
145 | return retval; | |
146 | } | |
147 | ||
148 | static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value) | |
149 | { | |
150 | struct slot *slot = hotplug_slot->private; | |
151 | int retval = 0; | |
152 | ||
66bef8c0 | 153 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
154 | |
155 | switch (value) { | |
156 | case 0: | |
157 | /* Specify a test here */ | |
158 | break; | |
159 | case 1: | |
160 | /* Specify another test here */ | |
161 | break; | |
162 | } | |
163 | ||
164 | return retval; | |
165 | } | |
166 | ||
167 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
168 | { | |
169 | struct slot *slot = hotplug_slot->private; | |
170 | int retval = 0; | |
171 | ||
66bef8c0 | 172 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
173 | |
174 | /* | |
175 | * Fill in logic to get the current power status of the specific | |
176 | * slot and store it in the *value location. | |
177 | */ | |
178 | ||
179 | return retval; | |
180 | } | |
181 | ||
182 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
183 | { | |
184 | struct slot *slot = hotplug_slot->private; | |
185 | int retval = 0; | |
186 | ||
66bef8c0 | 187 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
188 | |
189 | /* | |
190 | * Fill in logic to get the current attention status of the specific | |
191 | * slot and store it in the *value location. | |
192 | */ | |
193 | ||
194 | return retval; | |
195 | } | |
196 | ||
197 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
198 | { | |
199 | struct slot *slot = hotplug_slot->private; | |
200 | int retval = 0; | |
201 | ||
66bef8c0 | 202 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
203 | |
204 | /* | |
205 | * Fill in logic to get the current latch status of the specific | |
206 | * slot and store it in the *value location. | |
207 | */ | |
208 | ||
209 | return retval; | |
210 | } | |
211 | ||
212 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) | |
213 | { | |
214 | struct slot *slot = hotplug_slot->private; | |
215 | int retval = 0; | |
216 | ||
66bef8c0 | 217 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 LT |
218 | |
219 | /* | |
220 | * Fill in logic to get the current adapter status of the specific | |
221 | * slot and store it in the *value location. | |
222 | */ | |
223 | ||
224 | return retval; | |
225 | } | |
226 | ||
227 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
228 | { | |
229 | struct slot *slot = hotplug_slot->private; | |
230 | ||
66bef8c0 | 231 | dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name); |
1da177e4 | 232 | kfree(slot->hotplug_slot->info); |
1da177e4 LT |
233 | kfree(slot->hotplug_slot); |
234 | kfree(slot); | |
235 | } | |
236 | ||
1da177e4 LT |
237 | static void make_slot_name(struct slot *slot) |
238 | { | |
239 | /* | |
240 | * Stupid way to make a filename out of the slot name. | |
241 | * replace this if your hardware provides a better way to name slots. | |
242 | */ | |
243 | snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d", slot->number); | |
244 | } | |
245 | ||
246 | /** | |
247 | * init_slots - initialize 'struct slot' structures for each slot | |
248 | * | |
249 | */ | |
250 | static int __init init_slots(void) | |
251 | { | |
252 | struct slot *slot; | |
253 | struct hotplug_slot *hotplug_slot; | |
254 | struct hotplug_slot_info *info; | |
1da177e4 LT |
255 | int retval = -ENOMEM; |
256 | int i; | |
257 | ||
258 | /* | |
259 | * Create a structure for each slot, and register that slot | |
260 | * with the pci_hotplug subsystem. | |
261 | */ | |
262 | for (i = 0; i < num_slots; ++i) { | |
287588b3 | 263 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
1da177e4 LT |
264 | if (!slot) |
265 | goto error; | |
1da177e4 | 266 | |
287588b3 | 267 | hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); |
1da177e4 LT |
268 | if (!hotplug_slot) |
269 | goto error_slot; | |
1da177e4 LT |
270 | slot->hotplug_slot = hotplug_slot; |
271 | ||
287588b3 | 272 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
273 | if (!info) |
274 | goto error_hpslot; | |
1da177e4 LT |
275 | hotplug_slot->info = info; |
276 | ||
1da177e4 LT |
277 | slot->number = i; |
278 | ||
287588b3 | 279 | hotplug_slot->name = slot->name; |
1da177e4 LT |
280 | hotplug_slot->private = slot; |
281 | hotplug_slot->release = &release_slot; | |
282 | make_slot_name(slot); | |
283 | hotplug_slot->ops = &skel_hotplug_slot_ops; | |
284 | ||
285 | /* | |
eaae4b3a | 286 | * Initialize the slot info structure with some known |
1da177e4 LT |
287 | * good values. |
288 | */ | |
287588b3 KK |
289 | get_power_status(hotplug_slot, &info->power_status); |
290 | get_attention_status(hotplug_slot, &info->attention_status); | |
291 | get_latch_status(hotplug_slot, &info->latch_status); | |
292 | get_adapter_status(hotplug_slot, &info->adapter_status); | |
1da177e4 LT |
293 | |
294 | dbg("registering slot %d\n", i); | |
295 | retval = pci_hp_register(slot->hotplug_slot); | |
296 | if (retval) { | |
297 | err("pci_hp_register failed with error %d\n", retval); | |
287588b3 | 298 | goto error_info; |
1da177e4 LT |
299 | } |
300 | ||
301 | /* add slot to our internal list */ | |
302 | list_add(&slot->slot_list, &slot_list); | |
303 | } | |
304 | ||
305 | return 0; | |
1da177e4 LT |
306 | error_info: |
307 | kfree(info); | |
308 | error_hpslot: | |
309 | kfree(hotplug_slot); | |
310 | error_slot: | |
311 | kfree(slot); | |
312 | error: | |
313 | return retval; | |
314 | } | |
315 | ||
316 | static void __exit cleanup_slots(void) | |
317 | { | |
318 | struct list_head *tmp; | |
319 | struct list_head *next; | |
320 | struct slot *slot; | |
321 | ||
322 | /* | |
323 | * Unregister all of our slots with the pci_hotplug subsystem. | |
324 | * Memory will be freed in release_slot() callback after slot's | |
325 | * lifespan is finished. | |
326 | */ | |
327 | list_for_each_safe(tmp, next, &slot_list) { | |
328 | slot = list_entry(tmp, struct slot, slot_list); | |
329 | list_del(&slot->slot_list); | |
330 | pci_hp_deregister(slot->hotplug_slot); | |
331 | } | |
332 | } | |
333 | ||
334 | static int __init pcihp_skel_init(void) | |
335 | { | |
336 | int retval; | |
337 | ||
338 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); | |
339 | /* | |
340 | * Do specific initialization stuff for your driver here | |
753388c2 | 341 | * like initializing your controller hardware (if any) and |
1da177e4 LT |
342 | * determining the number of slots you have in the system |
343 | * right now. | |
344 | */ | |
345 | num_slots = 5; | |
346 | ||
347 | return init_slots(); | |
348 | } | |
349 | ||
350 | static void __exit pcihp_skel_exit(void) | |
351 | { | |
352 | /* | |
353 | * Clean everything up. | |
354 | */ | |
355 | cleanup_slots(); | |
356 | } | |
357 | ||
358 | module_init(pcihp_skel_init); | |
359 | module_exit(pcihp_skel_exit); |