fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / pci / hotplug / shpchp_core.c
blobfaf13abd5b99ded8d19fe2461c6807ac0e883ebf
1 /*
2 * Standard Hot Plug Controller Driver
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) 2003-2004 Intel Corporation
9 * All rights reserved.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/kernel.h>
33 #include <linux/types.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include "shpchp.h"
38 /* Global variables */
39 bool shpchp_debug;
40 bool shpchp_poll_mode;
41 int shpchp_poll_time;
43 #define DRIVER_VERSION "0.4"
44 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
45 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
47 MODULE_AUTHOR(DRIVER_AUTHOR);
48 MODULE_DESCRIPTION(DRIVER_DESC);
49 MODULE_LICENSE("GPL");
51 module_param(shpchp_debug, bool, 0644);
52 module_param(shpchp_poll_mode, bool, 0644);
53 module_param(shpchp_poll_time, int, 0644);
54 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
55 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
56 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
58 #define SHPC_MODULE_NAME "shpchp"
60 static int set_attention_status (struct hotplug_slot *slot, u8 value);
61 static int enable_slot (struct hotplug_slot *slot);
62 static int disable_slot (struct hotplug_slot *slot);
63 static int get_power_status (struct hotplug_slot *slot, u8 *value);
64 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
65 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
66 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
68 static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
69 .set_attention_status = set_attention_status,
70 .enable_slot = enable_slot,
71 .disable_slot = disable_slot,
72 .get_power_status = get_power_status,
73 .get_attention_status = get_attention_status,
74 .get_latch_status = get_latch_status,
75 .get_adapter_status = get_adapter_status,
78 /**
79 * release_slot - free up the memory used by a slot
80 * @hotplug_slot: slot to free
82 static void release_slot(struct hotplug_slot *hotplug_slot)
84 struct slot *slot = hotplug_slot->private;
86 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
87 __func__, slot_name(slot));
89 kfree(slot->hotplug_slot->info);
90 kfree(slot->hotplug_slot);
91 kfree(slot);
94 static int init_slots(struct controller *ctrl)
96 struct slot *slot;
97 struct hotplug_slot *hotplug_slot;
98 struct hotplug_slot_info *info;
99 char name[SLOT_NAME_SIZE];
100 int retval;
101 int i;
103 for (i = 0; i < ctrl->num_slots; i++) {
104 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
105 if (!slot) {
106 retval = -ENOMEM;
107 goto error;
110 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
111 if (!hotplug_slot) {
112 retval = -ENOMEM;
113 goto error_slot;
115 slot->hotplug_slot = hotplug_slot;
117 info = kzalloc(sizeof(*info), GFP_KERNEL);
118 if (!info) {
119 retval = -ENOMEM;
120 goto error_hpslot;
122 hotplug_slot->info = info;
124 slot->hp_slot = i;
125 slot->ctrl = ctrl;
126 slot->bus = ctrl->pci_dev->subordinate->number;
127 slot->device = ctrl->slot_device_offset + i;
128 slot->hpc_ops = ctrl->hpc_ops;
129 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
131 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number);
132 if (!slot->wq) {
133 retval = -ENOMEM;
134 goto error_info;
137 mutex_init(&slot->lock);
138 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
140 /* register this slot with the hotplug pci core */
141 hotplug_slot->private = slot;
142 hotplug_slot->release = &release_slot;
143 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
144 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
146 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
147 "hp_slot=%x sun=%x slot_device_offset=%x\n",
148 pci_domain_nr(ctrl->pci_dev->subordinate),
149 slot->bus, slot->device, slot->hp_slot, slot->number,
150 ctrl->slot_device_offset);
151 retval = pci_hp_register(slot->hotplug_slot,
152 ctrl->pci_dev->subordinate, slot->device, name);
153 if (retval) {
154 ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
155 retval);
156 goto error_slotwq;
159 get_power_status(hotplug_slot, &info->power_status);
160 get_attention_status(hotplug_slot, &info->attention_status);
161 get_latch_status(hotplug_slot, &info->latch_status);
162 get_adapter_status(hotplug_slot, &info->adapter_status);
164 list_add(&slot->slot_list, &ctrl->slot_list);
167 return 0;
168 error_slotwq:
169 destroy_workqueue(slot->wq);
170 error_info:
171 kfree(info);
172 error_hpslot:
173 kfree(hotplug_slot);
174 error_slot:
175 kfree(slot);
176 error:
177 return retval;
180 void cleanup_slots(struct controller *ctrl)
182 struct list_head *tmp;
183 struct list_head *next;
184 struct slot *slot;
186 list_for_each_safe(tmp, next, &ctrl->slot_list) {
187 slot = list_entry(tmp, struct slot, slot_list);
188 list_del(&slot->slot_list);
189 cancel_delayed_work(&slot->work);
190 destroy_workqueue(slot->wq);
191 pci_hp_deregister(slot->hotplug_slot);
196 * set_attention_status - Turns the Amber LED for a slot on, off or blink
198 static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
200 struct slot *slot = get_slot(hotplug_slot);
202 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
203 __func__, slot_name(slot));
205 hotplug_slot->info->attention_status = status;
206 slot->hpc_ops->set_attention_status(slot, status);
208 return 0;
211 static int enable_slot (struct hotplug_slot *hotplug_slot)
213 struct slot *slot = get_slot(hotplug_slot);
215 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
216 __func__, slot_name(slot));
218 return shpchp_sysfs_enable_slot(slot);
221 static int disable_slot (struct hotplug_slot *hotplug_slot)
223 struct slot *slot = get_slot(hotplug_slot);
225 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
226 __func__, slot_name(slot));
228 return shpchp_sysfs_disable_slot(slot);
231 static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
233 struct slot *slot = get_slot(hotplug_slot);
234 int retval;
236 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
237 __func__, slot_name(slot));
239 retval = slot->hpc_ops->get_power_status(slot, value);
240 if (retval < 0)
241 *value = hotplug_slot->info->power_status;
243 return 0;
246 static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
248 struct slot *slot = get_slot(hotplug_slot);
249 int retval;
251 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
252 __func__, slot_name(slot));
254 retval = slot->hpc_ops->get_attention_status(slot, value);
255 if (retval < 0)
256 *value = hotplug_slot->info->attention_status;
258 return 0;
261 static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
263 struct slot *slot = get_slot(hotplug_slot);
264 int retval;
266 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
267 __func__, slot_name(slot));
269 retval = slot->hpc_ops->get_latch_status(slot, value);
270 if (retval < 0)
271 *value = hotplug_slot->info->latch_status;
273 return 0;
276 static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
278 struct slot *slot = get_slot(hotplug_slot);
279 int retval;
281 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
282 __func__, slot_name(slot));
284 retval = slot->hpc_ops->get_adapter_status(slot, value);
285 if (retval < 0)
286 *value = hotplug_slot->info->adapter_status;
288 return 0;
291 static int is_shpc_capable(struct pci_dev *dev)
293 if (dev->vendor == PCI_VENDOR_ID_AMD &&
294 dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
295 return 1;
296 if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
297 return 0;
298 if (get_hp_hw_control_from_firmware(dev))
299 return 0;
300 return 1;
303 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
305 int rc;
306 struct controller *ctrl;
308 if (!is_shpc_capable(pdev))
309 return -ENODEV;
311 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
312 if (!ctrl) {
313 dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
314 goto err_out_none;
316 INIT_LIST_HEAD(&ctrl->slot_list);
318 rc = shpc_init(ctrl, pdev);
319 if (rc) {
320 ctrl_dbg(ctrl, "Controller initialization failed\n");
321 goto err_out_free_ctrl;
324 pci_set_drvdata(pdev, ctrl);
326 /* Setup the slot information structures */
327 rc = init_slots(ctrl);
328 if (rc) {
329 ctrl_err(ctrl, "Slot initialization failed\n");
330 goto err_out_release_ctlr;
333 rc = shpchp_create_ctrl_files(ctrl);
334 if (rc)
335 goto err_cleanup_slots;
337 return 0;
339 err_cleanup_slots:
340 cleanup_slots(ctrl);
341 err_out_release_ctlr:
342 ctrl->hpc_ops->release_ctlr(ctrl);
343 err_out_free_ctrl:
344 kfree(ctrl);
345 err_out_none:
346 return -ENODEV;
349 static void shpc_remove(struct pci_dev *dev)
351 struct controller *ctrl = pci_get_drvdata(dev);
353 shpchp_remove_ctrl_files(ctrl);
354 ctrl->hpc_ops->release_ctlr(ctrl);
355 kfree(ctrl);
358 static struct pci_device_id shpcd_pci_tbl[] = {
359 {PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
360 { /* end: all zeroes */ }
362 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
364 static struct pci_driver shpc_driver = {
365 .name = SHPC_MODULE_NAME,
366 .id_table = shpcd_pci_tbl,
367 .probe = shpc_probe,
368 .remove = shpc_remove,
371 static int __init shpcd_init(void)
373 int retval;
375 retval = pci_register_driver(&shpc_driver);
376 dbg("%s: pci_register_driver = %d\n", __func__, retval);
377 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
379 return retval;
382 static void __exit shpcd_cleanup(void)
384 dbg("unload_shpchpd()\n");
385 pci_unregister_driver(&shpc_driver);
386 info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
389 module_init(shpcd_init);
390 module_exit(shpcd_cleanup);