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Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -07001/*
2 * bay.c - ACPI removable drive bay driver
3 *
4 * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 */
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/notifier.h>
29#include <acpi/acpi_bus.h>
30#include <acpi/acpi_drivers.h>
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070031#include <linux/seq_file.h>
32#include <asm/uaccess.h>
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -050033#include <linux/platform_device.h>
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070034
Len Brownf52fd662007-02-12 22:42:12 -050035ACPI_MODULE_NAME("bay");
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070036MODULE_AUTHOR("Kristen Carlson Accardi");
Len Brown7cda93e2007-02-12 23:50:02 -050037MODULE_DESCRIPTION("ACPI Removable Drive Bay Driver");
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070038MODULE_LICENSE("GPL");
39#define ACPI_BAY_CLASS "bay"
40#define ACPI_BAY_COMPONENT 0x10000000
41#define _COMPONENT ACPI_BAY_COMPONENT
42#define bay_dprintk(h,s) {\
43 char prefix[80] = {'\0'};\
44 struct acpi_buffer buffer = {sizeof(prefix), prefix};\
45 acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
46 printk(KERN_DEBUG PREFIX "%s: %s\n", prefix, s); }
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070047static void bay_notify(acpi_handle handle, u32 event, void *data);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070048
49struct bay {
50 acpi_handle handle;
51 char *name;
52 struct list_head list;
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -050053 struct platform_device *pdev;
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070054};
55
Adrian Bunk5d22e1e2006-12-04 14:49:39 -080056static LIST_HEAD(drive_bays);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070057
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -070058
59/*****************************************************************************
60 * Drive Bay functions *
61 *****************************************************************************/
62/**
63 * is_ejectable - see if a device is ejectable
64 * @handle: acpi handle of the device
65 *
66 * If an acpi object has a _EJ0 method, then it is ejectable
67 */
68static int is_ejectable(acpi_handle handle)
69{
70 acpi_status status;
71 acpi_handle tmp;
72
73 status = acpi_get_handle(handle, "_EJ0", &tmp);
74 if (ACPI_FAILURE(status))
75 return 0;
76 return 1;
77}
78
79/**
80 * bay_present - see if the bay device is present
81 * @bay: the drive bay
82 *
83 * execute the _STA method.
84 */
85static int bay_present(struct bay *bay)
86{
87 unsigned long sta;
88 acpi_status status;
89
90 if (bay) {
91 status = acpi_evaluate_integer(bay->handle, "_STA", NULL, &sta);
92 if (ACPI_SUCCESS(status) && sta)
93 return 1;
94 }
95 return 0;
96}
97
98/**
99 * eject_device - respond to an eject request
100 * @handle - the device to eject
101 *
102 * Call this devices _EJ0 method.
103 */
104static void eject_device(acpi_handle handle)
105{
106 struct acpi_object_list arg_list;
107 union acpi_object arg;
108
109 bay_dprintk(handle, "Ejecting device");
110
111 arg_list.count = 1;
112 arg_list.pointer = &arg;
113 arg.type = ACPI_TYPE_INTEGER;
114 arg.integer.value = 1;
115
116 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
117 &arg_list, NULL)))
118 pr_debug("Failed to evaluate _EJ0!\n");
119}
120
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500121/*
122 * show_present - read method for "present" file in sysfs
123 */
124static ssize_t show_present(struct device *dev,
125 struct device_attribute *attr, char *buf)
126{
127 struct bay *bay = dev_get_drvdata(dev);
128 return snprintf(buf, PAGE_SIZE, "%d\n", bay_present(bay));
129
130}
131DEVICE_ATTR(present, S_IRUGO, show_present, NULL);
132
133/*
134 * write_eject - write method for "eject" file in sysfs
135 */
136static ssize_t write_eject(struct device *dev, struct device_attribute *attr,
137 const char *buf, size_t count)
138{
139 struct bay *bay = dev_get_drvdata(dev);
140
141 if (!count)
142 return -EINVAL;
143
144 eject_device(bay->handle);
145 return count;
146}
147DEVICE_ATTR(eject, S_IWUSR, NULL, write_eject);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700148
149/**
150 * is_ata - see if a device is an ata device
151 * @handle: acpi handle of the device
152 *
153 * If an acpi object has one of 4 ATA ACPI methods defined,
154 * then it is an ATA device
155 */
156static int is_ata(acpi_handle handle)
157{
158 acpi_handle tmp;
159
160 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
161 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
162 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
163 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
164 return 1;
165
166 return 0;
167}
168
169/**
170 * parent_is_ata(acpi_handle handle)
171 *
172 */
173static int parent_is_ata(acpi_handle handle)
174{
175 acpi_handle phandle;
176
177 if (acpi_get_parent(handle, &phandle))
178 return 0;
179
180 return is_ata(phandle);
181}
182
183/**
184 * is_ejectable_bay - see if a device is an ejectable drive bay
185 * @handle: acpi handle of the device
186 *
187 * If an acpi object is ejectable and has one of the ACPI ATA
188 * methods defined, then we can safely call it an ejectable
189 * drive bay
190 */
191static int is_ejectable_bay(acpi_handle handle)
192{
193 if ((is_ata(handle) || parent_is_ata(handle)) && is_ejectable(handle))
194 return 1;
195 return 0;
196}
197
198/**
199 * eject_removable_drive - try to eject this drive
200 * @dev : the device structure of the drive
201 *
202 * If a device is a removable drive that requires an _EJ0 method
203 * to be executed in order to safely remove from the system, do
204 * it. ATM - always returns success
205 */
206int eject_removable_drive(struct device *dev)
207{
208 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
209
210 if (handle) {
211 bay_dprintk(handle, "Got device handle");
212 if (is_ejectable_bay(handle))
213 eject_device(handle);
214 } else {
215 printk("No acpi handle for device\n");
216 }
217
218 /* should I return an error code? */
219 return 0;
220}
221EXPORT_SYMBOL_GPL(eject_removable_drive);
222
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700223static int acpi_bay_add_fs(struct bay *bay)
224{
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500225 int ret;
226 struct device *dev = &bay->pdev->dev;
227
228 ret = device_create_file(dev, &dev_attr_present);
229 if (ret)
230 goto add_fs_err;
231 ret = device_create_file(dev, &dev_attr_eject);
232 if (ret) {
233 device_remove_file(dev, &dev_attr_present);
234 goto add_fs_err;
235 }
236 return 0;
237
238 add_fs_err:
239 bay_dprintk(bay->handle, "Error adding sysfs files\n");
240 return ret;
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700241}
242
243static void acpi_bay_remove_fs(struct bay *bay)
244{
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500245 struct device *dev = &bay->pdev->dev;
246
247 /* cleanup sysfs */
248 device_remove_file(dev, &dev_attr_present);
249 device_remove_file(dev, &dev_attr_eject);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700250}
251
252static int bay_is_dock_device(acpi_handle handle)
253{
254 acpi_handle parent;
255
256 acpi_get_parent(handle, &parent);
257
258 /* if the device or it's parent is dependent on the
259 * dock, then we are a dock device
260 */
261 return (is_dock_device(handle) || is_dock_device(parent));
262}
263
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500264static int bay_add(acpi_handle handle, int id)
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700265{
266 acpi_status status;
267 struct bay *new_bay;
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500268 struct platform_device *pdev;
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700269 struct acpi_buffer nbuffer = {ACPI_ALLOCATE_BUFFER, NULL};
270 acpi_get_name(handle, ACPI_FULL_PATHNAME, &nbuffer);
271
272 bay_dprintk(handle, "Adding notify handler");
273
274 /*
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700275 * Initialize bay device structure
276 */
Al Viroa3c94e52007-02-09 16:05:07 +0000277 new_bay = kzalloc(sizeof(*new_bay), GFP_ATOMIC);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700278 INIT_LIST_HEAD(&new_bay->list);
279 new_bay->handle = handle;
280 new_bay->name = (char *)nbuffer.pointer;
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500281
282 /* initialize platform device stuff */
283 pdev = platform_device_register_simple(ACPI_BAY_CLASS, id, NULL, 0);
Henrique de Moraes Holschuh05397712007-02-14 10:55:00 -0200284 if (IS_ERR(pdev)) {
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500285 printk(KERN_ERR PREFIX "Error registering bay device\n");
286 goto bay_add_err;
287 }
288 new_bay->pdev = pdev;
289 platform_set_drvdata(pdev, new_bay);
290
291 if (acpi_bay_add_fs(new_bay)) {
292 platform_device_unregister(new_bay->pdev);
293 goto bay_add_err;
294 }
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700295
296 /* register for events on this device */
297 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
298 bay_notify, new_bay);
299 if (ACPI_FAILURE(status)) {
300 printk(KERN_ERR PREFIX "Error installing bay notify handler\n");
301 }
302
303 /* if we are on a dock station, we should register for dock
304 * notifications.
305 */
306 if (bay_is_dock_device(handle)) {
307 bay_dprintk(handle, "Is dependent on dock\n");
308 register_hotplug_dock_device(handle, bay_notify, new_bay);
309 }
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500310 list_add(&new_bay->list, &drive_bays);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700311 printk(KERN_INFO PREFIX "Bay [%s] Added\n", new_bay->name);
312 return 0;
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500313
314bay_add_err:
315 kfree(new_bay->name);
316 kfree(new_bay);
317 return -ENODEV;
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700318}
319
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700320/**
321 * bay_notify - act upon an acpi bay notification
322 * @handle: the bay handle
323 * @event: the acpi event
324 * @data: our driver data struct
325 *
326 */
327static void bay_notify(acpi_handle handle, u32 event, void *data)
328{
Kristen Carlson Accardic41458a2007-02-05 16:09:07 -0800329 struct bay *bay_dev = (struct bay *)data;
330 struct device *dev = &bay_dev->pdev->dev;
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700331
332 bay_dprintk(handle, "Bay event");
333
334 switch(event) {
335 case ACPI_NOTIFY_BUS_CHECK:
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700336 case ACPI_NOTIFY_DEVICE_CHECK:
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700337 case ACPI_NOTIFY_EJECT_REQUEST:
Kristen Carlson Accardic41458a2007-02-05 16:09:07 -0800338 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700339 break;
340 default:
Kristen Carlson Accardic41458a2007-02-05 16:09:07 -0800341 printk(KERN_ERR PREFIX "Bay: unknown event %d\n", event);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700342 }
343}
344
345static acpi_status
346find_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
347{
348 int *count = (int *)context;
349
350 /*
351 * there could be more than one ejectable bay.
352 * so, just return AE_OK always so that every object
353 * will be checked.
354 */
355 if (is_ejectable_bay(handle)) {
356 bay_dprintk(handle, "found ejectable bay");
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500357 if (!bay_add(handle, *count))
358 (*count)++;
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700359 }
360 return AE_OK;
361}
362
363static int __init bay_init(void)
364{
365 int bays = 0;
366
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700367 INIT_LIST_HEAD(&drive_bays);
368
369 /* look for dockable drive bays */
370 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
371 ACPI_UINT32_MAX, find_bay, &bays, NULL);
372
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700373 if (!bays)
374 return -ENODEV;
375
376 return 0;
377}
378
379static void __exit bay_exit(void)
380{
381 struct bay *bay, *tmp;
382
383 list_for_each_entry_safe(bay, tmp, &drive_bays, list) {
384 if (is_dock_device(bay->handle))
385 unregister_hotplug_dock_device(bay->handle);
386 acpi_bay_remove_fs(bay);
387 acpi_remove_notify_handler(bay->handle, ACPI_SYSTEM_NOTIFY,
388 bay_notify);
Kristen Carlson Accardi2b167c02006-12-18 18:07:00 -0500389 platform_device_unregister(bay->pdev);
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700390 kfree(bay->name);
391 kfree(bay);
392 }
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700393}
394
395postcore_initcall(bay_init);
396module_exit(bay_exit);
397