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