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16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/kernel.h>
19#include <linux/types.h>
20#include <linux/slab.h>
21#include <linux/pci.h>
22#include "shpchp.h"
23
24
25bool shpchp_debug;
26bool shpchp_poll_mode;
27int shpchp_poll_time;
28
29#define DRIVER_VERSION "0.4"
30#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
31#define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
32
33MODULE_AUTHOR(DRIVER_AUTHOR);
34MODULE_DESCRIPTION(DRIVER_DESC);
35MODULE_LICENSE("GPL");
36
37module_param(shpchp_debug, bool, 0644);
38module_param(shpchp_poll_mode, bool, 0644);
39module_param(shpchp_poll_time, int, 0644);
40MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
41MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
42MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
43
44#define SHPC_MODULE_NAME "shpchp"
45
46static int set_attention_status(struct hotplug_slot *slot, u8 value);
47static int enable_slot(struct hotplug_slot *slot);
48static int disable_slot(struct hotplug_slot *slot);
49static int get_power_status(struct hotplug_slot *slot, u8 *value);
50static int get_attention_status(struct hotplug_slot *slot, u8 *value);
51static int get_latch_status(struct hotplug_slot *slot, u8 *value);
52static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
53
54static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
55 .set_attention_status = set_attention_status,
56 .enable_slot = enable_slot,
57 .disable_slot = disable_slot,
58 .get_power_status = get_power_status,
59 .get_attention_status = get_attention_status,
60 .get_latch_status = get_latch_status,
61 .get_adapter_status = get_adapter_status,
62};
63
64
65
66
67
68static void release_slot(struct hotplug_slot *hotplug_slot)
69{
70 struct slot *slot = hotplug_slot->private;
71
72 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
73 __func__, slot_name(slot));
74
75 kfree(slot->hotplug_slot->info);
76 kfree(slot->hotplug_slot);
77 kfree(slot);
78}
79
80static int init_slots(struct controller *ctrl)
81{
82 struct slot *slot;
83 struct hotplug_slot *hotplug_slot;
84 struct hotplug_slot_info *info;
85 char name[SLOT_NAME_SIZE];
86 int retval;
87 int i;
88
89 for (i = 0; i < ctrl->num_slots; i++) {
90 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
91 if (!slot) {
92 retval = -ENOMEM;
93 goto error;
94 }
95
96 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
97 if (!hotplug_slot) {
98 retval = -ENOMEM;
99 goto error_slot;
100 }
101 slot->hotplug_slot = hotplug_slot;
102
103 info = kzalloc(sizeof(*info), GFP_KERNEL);
104 if (!info) {
105 retval = -ENOMEM;
106 goto error_hpslot;
107 }
108 hotplug_slot->info = info;
109
110 slot->hp_slot = i;
111 slot->ctrl = ctrl;
112 slot->bus = ctrl->pci_dev->subordinate->number;
113 slot->device = ctrl->slot_device_offset + i;
114 slot->hpc_ops = ctrl->hpc_ops;
115 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
116
117 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
118 if (!slot->wq) {
119 retval = -ENOMEM;
120 goto error_info;
121 }
122
123 mutex_init(&slot->lock);
124 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
125
126
127 hotplug_slot->private = slot;
128 hotplug_slot->release = &release_slot;
129 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
130 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
131
132 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n",
133 pci_domain_nr(ctrl->pci_dev->subordinate),
134 slot->bus, slot->device, slot->hp_slot, slot->number,
135 ctrl->slot_device_offset);
136 retval = pci_hp_register(slot->hotplug_slot,
137 ctrl->pci_dev->subordinate, slot->device, name);
138 if (retval) {
139 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
140 retval);
141 goto error_slotwq;
142 }
143
144 get_power_status(hotplug_slot, &info->power_status);
145 get_attention_status(hotplug_slot, &info->attention_status);
146 get_latch_status(hotplug_slot, &info->latch_status);
147 get_adapter_status(hotplug_slot, &info->adapter_status);
148
149 list_add(&slot->slot_list, &ctrl->slot_list);
150 }
151
152 return 0;
153error_slotwq:
154 destroy_workqueue(slot->wq);
155error_info:
156 kfree(info);
157error_hpslot:
158 kfree(hotplug_slot);
159error_slot:
160 kfree(slot);
161error:
162 return retval;
163}
164
165void cleanup_slots(struct controller *ctrl)
166{
167 struct slot *slot, *next;
168
169 list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) {
170 list_del(&slot->slot_list);
171 cancel_delayed_work(&slot->work);
172 destroy_workqueue(slot->wq);
173 pci_hp_deregister(slot->hotplug_slot);
174 }
175}
176
177
178
179
180static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
181{
182 struct slot *slot = get_slot(hotplug_slot);
183
184 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
185 __func__, slot_name(slot));
186
187 hotplug_slot->info->attention_status = status;
188 slot->hpc_ops->set_attention_status(slot, status);
189
190 return 0;
191}
192
193static int enable_slot(struct hotplug_slot *hotplug_slot)
194{
195 struct slot *slot = get_slot(hotplug_slot);
196
197 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
198 __func__, slot_name(slot));
199
200 return shpchp_sysfs_enable_slot(slot);
201}
202
203static int disable_slot(struct hotplug_slot *hotplug_slot)
204{
205 struct slot *slot = get_slot(hotplug_slot);
206
207 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
208 __func__, slot_name(slot));
209
210 return shpchp_sysfs_disable_slot(slot);
211}
212
213static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
214{
215 struct slot *slot = get_slot(hotplug_slot);
216 int retval;
217
218 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
219 __func__, slot_name(slot));
220
221 retval = slot->hpc_ops->get_power_status(slot, value);
222 if (retval < 0)
223 *value = hotplug_slot->info->power_status;
224
225 return 0;
226}
227
228static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
229{
230 struct slot *slot = get_slot(hotplug_slot);
231 int retval;
232
233 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
234 __func__, slot_name(slot));
235
236 retval = slot->hpc_ops->get_attention_status(slot, value);
237 if (retval < 0)
238 *value = hotplug_slot->info->attention_status;
239
240 return 0;
241}
242
243static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
244{
245 struct slot *slot = get_slot(hotplug_slot);
246 int retval;
247
248 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
249 __func__, slot_name(slot));
250
251 retval = slot->hpc_ops->get_latch_status(slot, value);
252 if (retval < 0)
253 *value = hotplug_slot->info->latch_status;
254
255 return 0;
256}
257
258static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
259{
260 struct slot *slot = get_slot(hotplug_slot);
261 int retval;
262
263 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
264 __func__, slot_name(slot));
265
266 retval = slot->hpc_ops->get_adapter_status(slot, value);
267 if (retval < 0)
268 *value = hotplug_slot->info->adapter_status;
269
270 return 0;
271}
272
273static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
274{
275 int rc;
276 struct controller *ctrl;
277
278 if (acpi_get_hp_hw_control_from_firmware(pdev))
279 return -ENODEV;
280
281 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
282 if (!ctrl)
283 goto err_out_none;
284
285 INIT_LIST_HEAD(&ctrl->slot_list);
286
287 rc = shpc_init(ctrl, pdev);
288 if (rc) {
289 ctrl_dbg(ctrl, "Controller initialization failed\n");
290 goto err_out_free_ctrl;
291 }
292
293 pci_set_drvdata(pdev, ctrl);
294
295
296 rc = init_slots(ctrl);
297 if (rc) {
298 ctrl_err(ctrl, "Slot initialization failed\n");
299 goto err_out_release_ctlr;
300 }
301
302 rc = shpchp_create_ctrl_files(ctrl);
303 if (rc)
304 goto err_cleanup_slots;
305
306 return 0;
307
308err_cleanup_slots:
309 cleanup_slots(ctrl);
310err_out_release_ctlr:
311 ctrl->hpc_ops->release_ctlr(ctrl);
312err_out_free_ctrl:
313 kfree(ctrl);
314err_out_none:
315 return -ENODEV;
316}
317
318static void shpc_remove(struct pci_dev *dev)
319{
320 struct controller *ctrl = pci_get_drvdata(dev);
321
322 shpchp_remove_ctrl_files(ctrl);
323 ctrl->hpc_ops->release_ctlr(ctrl);
324 kfree(ctrl);
325}
326
327static const struct pci_device_id shpcd_pci_tbl[] = {
328 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
329 { }
330};
331MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
332
333static struct pci_driver shpc_driver = {
334 .name = SHPC_MODULE_NAME,
335 .id_table = shpcd_pci_tbl,
336 .probe = shpc_probe,
337 .remove = shpc_remove,
338};
339
340static int __init shpcd_init(void)
341{
342 int retval;
343
344 retval = pci_register_driver(&shpc_driver);
345 dbg("%s: pci_register_driver = %d\n", __func__, retval);
346 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
347
348 return retval;
349}
350
351static void __exit shpcd_cleanup(void)
352{
353 dbg("unload_shpchpd()\n");
354 pci_unregister_driver(&shpc_driver);
355 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
356}
357
358module_init(shpcd_init);
359module_exit(shpcd_cleanup);
360
