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Linux/drivers/acpi/ac.c

  1 /*
  2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
  3  *
  4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  6  *
  7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  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.  See the GNU
 17  *  General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License along
 20  *  with this program; if not, write to the Free Software Foundation, Inc.,
 21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 22  *
 23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/slab.h>
 29 #include <linux/init.h>
 30 #include <linux/types.h>
 31 #include <linux/dmi.h>
 32 #include <linux/delay.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/power_supply.h>
 35 #include <linux/acpi.h>
 36 #include "battery.h"
 37 
 38 #define PREFIX "ACPI: "
 39 
 40 #define ACPI_AC_CLASS                   "ac_adapter"
 41 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
 42 #define ACPI_AC_FILE_STATE              "state"
 43 #define ACPI_AC_NOTIFY_STATUS           0x80
 44 #define ACPI_AC_STATUS_OFFLINE          0x00
 45 #define ACPI_AC_STATUS_ONLINE           0x01
 46 #define ACPI_AC_STATUS_UNKNOWN          0xFF
 47 
 48 #define _COMPONENT              ACPI_AC_COMPONENT
 49 ACPI_MODULE_NAME("ac");
 50 
 51 MODULE_AUTHOR("Paul Diefenbaugh");
 52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
 53 MODULE_LICENSE("GPL");
 54 
 55 static int acpi_ac_add(struct acpi_device *device);
 56 static int acpi_ac_remove(struct acpi_device *device);
 57 static void acpi_ac_notify(struct acpi_device *device, u32 event);
 58 
 59 static const struct acpi_device_id ac_device_ids[] = {
 60         {"ACPI0003", 0},
 61         {"", 0},
 62 };
 63 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 64 
 65 #ifdef CONFIG_PM_SLEEP
 66 static int acpi_ac_resume(struct device *dev);
 67 #endif
 68 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
 69 
 70 static int ac_sleep_before_get_state_ms;
 71 
 72 static struct acpi_driver acpi_ac_driver = {
 73         .name = "ac",
 74         .class = ACPI_AC_CLASS,
 75         .ids = ac_device_ids,
 76         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 77         .ops = {
 78                 .add = acpi_ac_add,
 79                 .remove = acpi_ac_remove,
 80                 .notify = acpi_ac_notify,
 81                 },
 82         .drv.pm = &acpi_ac_pm,
 83 };
 84 
 85 struct acpi_ac {
 86         struct power_supply charger;
 87         struct acpi_device * device;
 88         unsigned long long state;
 89         struct notifier_block battery_nb;
 90 };
 91 
 92 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
 93 
 94 /* --------------------------------------------------------------------------
 95                                AC Adapter Management
 96    -------------------------------------------------------------------------- */
 97 
 98 static int acpi_ac_get_state(struct acpi_ac *ac)
 99 {
100         acpi_status status = AE_OK;
101 
102         if (!ac)
103                 return -EINVAL;
104 
105         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
106                                        &ac->state);
107         if (ACPI_FAILURE(status)) {
108                 ACPI_EXCEPTION((AE_INFO, status,
109                                 "Error reading AC Adapter state"));
110                 ac->state = ACPI_AC_STATUS_UNKNOWN;
111                 return -ENODEV;
112         }
113 
114         return 0;
115 }
116 
117 /* --------------------------------------------------------------------------
118                             sysfs I/F
119    -------------------------------------------------------------------------- */
120 static int get_ac_property(struct power_supply *psy,
121                            enum power_supply_property psp,
122                            union power_supply_propval *val)
123 {
124         struct acpi_ac *ac = to_acpi_ac(psy);
125 
126         if (!ac)
127                 return -ENODEV;
128 
129         if (acpi_ac_get_state(ac))
130                 return -ENODEV;
131 
132         switch (psp) {
133         case POWER_SUPPLY_PROP_ONLINE:
134                 val->intval = ac->state;
135                 break;
136         default:
137                 return -EINVAL;
138         }
139         return 0;
140 }
141 
142 static enum power_supply_property ac_props[] = {
143         POWER_SUPPLY_PROP_ONLINE,
144 };
145 
146 /* --------------------------------------------------------------------------
147                                    Driver Model
148    -------------------------------------------------------------------------- */
149 
150 static void acpi_ac_notify(struct acpi_device *device, u32 event)
151 {
152         struct acpi_ac *ac = acpi_driver_data(device);
153 
154         if (!ac)
155                 return;
156 
157         switch (event) {
158         default:
159                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
160                                   "Unsupported event [0x%x]\n", event));
161         case ACPI_AC_NOTIFY_STATUS:
162         case ACPI_NOTIFY_BUS_CHECK:
163         case ACPI_NOTIFY_DEVICE_CHECK:
164                 /*
165                  * A buggy BIOS may notify AC first and then sleep for
166                  * a specific time before doing actual operations in the
167                  * EC event handler (_Qxx). This will cause the AC state
168                  * reported by the ACPI event to be incorrect, so wait for a
169                  * specific time for the EC event handler to make progress.
170                  */
171                 if (ac_sleep_before_get_state_ms > 0)
172                         msleep(ac_sleep_before_get_state_ms);
173 
174                 acpi_ac_get_state(ac);
175                 acpi_bus_generate_netlink_event(device->pnp.device_class,
176                                                   dev_name(&device->dev), event,
177                                                   (u32) ac->state);
178                 acpi_notifier_call_chain(device, event, (u32) ac->state);
179                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
180         }
181 
182         return;
183 }
184 
185 static int acpi_ac_battery_notify(struct notifier_block *nb,
186                                   unsigned long action, void *data)
187 {
188         struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
189         struct acpi_bus_event *event = (struct acpi_bus_event *)data;
190 
191         /*
192          * On HP Pavilion dv6-6179er AC status notifications aren't triggered
193          * when adapter is plugged/unplugged. However, battery status
194          * notifcations are triggered when battery starts charging or
195          * discharging. Re-reading AC status triggers lost AC notifications,
196          * if AC status has changed.
197          */
198         if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
199             event->type == ACPI_BATTERY_NOTIFY_STATUS)
200                 acpi_ac_get_state(ac);
201 
202         return NOTIFY_OK;
203 }
204 
205 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
206 {
207         ac_sleep_before_get_state_ms = 1000;
208         return 0;
209 }
210 
211 static struct dmi_system_id ac_dmi_table[] = {
212         {
213         .callback = thinkpad_e530_quirk,
214         .ident = "thinkpad e530",
215         .matches = {
216                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
217                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
218                 },
219         },
220         {},
221 };
222 
223 static int acpi_ac_add(struct acpi_device *device)
224 {
225         int result = 0;
226         struct acpi_ac *ac = NULL;
227 
228 
229         if (!device)
230                 return -EINVAL;
231 
232         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
233         if (!ac)
234                 return -ENOMEM;
235 
236         ac->device = device;
237         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
238         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
239         device->driver_data = ac;
240 
241         result = acpi_ac_get_state(ac);
242         if (result)
243                 goto end;
244 
245         ac->charger.name = acpi_device_bid(device);
246         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
247         ac->charger.properties = ac_props;
248         ac->charger.num_properties = ARRAY_SIZE(ac_props);
249         ac->charger.get_property = get_ac_property;
250         result = power_supply_register(&ac->device->dev, &ac->charger);
251         if (result)
252                 goto end;
253 
254         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
255                acpi_device_name(device), acpi_device_bid(device),
256                ac->state ? "on-line" : "off-line");
257 
258         ac->battery_nb.notifier_call = acpi_ac_battery_notify;
259         register_acpi_notifier(&ac->battery_nb);
260 end:
261         if (result)
262                 kfree(ac);
263 
264         dmi_check_system(ac_dmi_table);
265         return result;
266 }
267 
268 #ifdef CONFIG_PM_SLEEP
269 static int acpi_ac_resume(struct device *dev)
270 {
271         struct acpi_ac *ac;
272         unsigned old_state;
273 
274         if (!dev)
275                 return -EINVAL;
276 
277         ac = acpi_driver_data(to_acpi_device(dev));
278         if (!ac)
279                 return -EINVAL;
280 
281         old_state = ac->state;
282         if (acpi_ac_get_state(ac))
283                 return 0;
284         if (old_state != ac->state)
285                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
286         return 0;
287 }
288 #else
289 #define acpi_ac_resume NULL
290 #endif
291 
292 static int acpi_ac_remove(struct acpi_device *device)
293 {
294         struct acpi_ac *ac = NULL;
295 
296 
297         if (!device || !acpi_driver_data(device))
298                 return -EINVAL;
299 
300         ac = acpi_driver_data(device);
301 
302         if (ac->charger.dev)
303                 power_supply_unregister(&ac->charger);
304         unregister_acpi_notifier(&ac->battery_nb);
305 
306         kfree(ac);
307 
308         return 0;
309 }
310 
311 static int __init acpi_ac_init(void)
312 {
313         int result;
314 
315         if (acpi_disabled)
316                 return -ENODEV;
317 
318         result = acpi_bus_register_driver(&acpi_ac_driver);
319         if (result < 0)
320                 return -ENODEV;
321 
322         return 0;
323 }
324 
325 static void __exit acpi_ac_exit(void)
326 {
327         acpi_bus_unregister_driver(&acpi_ac_driver);
328 }
329 module_init(acpi_ac_init);
330 module_exit(acpi_ac_exit);
331 

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