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 37 #define PREFIX "ACPI: " 38 39 #define ACPI_AC_CLASS "ac_adapter" 40 #define ACPI_AC_DEVICE_NAME "AC Adapter" 41 #define ACPI_AC_FILE_STATE "state" 42 #define ACPI_AC_NOTIFY_STATUS 0x80 43 #define ACPI_AC_STATUS_OFFLINE 0x00 44 #define ACPI_AC_STATUS_ONLINE 0x01 45 #define ACPI_AC_STATUS_UNKNOWN 0xFF 46 47 #define _COMPONENT ACPI_AC_COMPONENT 48 ACPI_MODULE_NAME("ac"); 49 50 MODULE_AUTHOR("Paul Diefenbaugh"); 51 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 52 MODULE_LICENSE("GPL"); 53 54 static int ac_sleep_before_get_state_ms; 55 56 struct acpi_ac { 57 struct power_supply charger; 58 struct platform_device *pdev; 59 unsigned long long state; 60 }; 61 62 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger) 63 64 /* -------------------------------------------------------------------------- 65 AC Adapter Management 66 -------------------------------------------------------------------------- */ 67 68 static int acpi_ac_get_state(struct acpi_ac *ac) 69 { 70 acpi_status status; 71 acpi_handle handle = ACPI_HANDLE(&ac->pdev->dev); 72 73 status = acpi_evaluate_integer(handle, "_PSR", NULL, 74 &ac->state); 75 if (ACPI_FAILURE(status)) { 76 ACPI_EXCEPTION((AE_INFO, status, 77 "Error reading AC Adapter state")); 78 ac->state = ACPI_AC_STATUS_UNKNOWN; 79 return -ENODEV; 80 } 81 82 return 0; 83 } 84 85 /* -------------------------------------------------------------------------- 86 sysfs I/F 87 -------------------------------------------------------------------------- */ 88 static int get_ac_property(struct power_supply *psy, 89 enum power_supply_property psp, 90 union power_supply_propval *val) 91 { 92 struct acpi_ac *ac = to_acpi_ac(psy); 93 94 if (!ac) 95 return -ENODEV; 96 97 if (acpi_ac_get_state(ac)) 98 return -ENODEV; 99 100 switch (psp) { 101 case POWER_SUPPLY_PROP_ONLINE: 102 val->intval = ac->state; 103 break; 104 default: 105 return -EINVAL; 106 } 107 return 0; 108 } 109 110 static enum power_supply_property ac_props[] = { 111 POWER_SUPPLY_PROP_ONLINE, 112 }; 113 114 /* -------------------------------------------------------------------------- 115 Driver Model 116 -------------------------------------------------------------------------- */ 117 118 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data) 119 { 120 struct acpi_ac *ac = data; 121 struct acpi_device *adev; 122 123 if (!ac) 124 return; 125 126 switch (event) { 127 default: 128 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 129 "Unsupported event [0x%x]\n", event)); 130 case ACPI_AC_NOTIFY_STATUS: 131 case ACPI_NOTIFY_BUS_CHECK: 132 case ACPI_NOTIFY_DEVICE_CHECK: 133 /* 134 * A buggy BIOS may notify AC first and then sleep for 135 * a specific time before doing actual operations in the 136 * EC event handler (_Qxx). This will cause the AC state 137 * reported by the ACPI event to be incorrect, so wait for a 138 * specific time for the EC event handler to make progress. 139 */ 140 if (ac_sleep_before_get_state_ms > 0) 141 msleep(ac_sleep_before_get_state_ms); 142 143 acpi_ac_get_state(ac); 144 adev = ACPI_COMPANION(&ac->pdev->dev); 145 acpi_bus_generate_netlink_event(adev->pnp.device_class, 146 dev_name(&ac->pdev->dev), 147 event, (u32) ac->state); 148 acpi_notifier_call_chain(adev, event, (u32) ac->state); 149 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 150 } 151 152 return; 153 } 154 155 static int thinkpad_e530_quirk(const struct dmi_system_id *d) 156 { 157 ac_sleep_before_get_state_ms = 1000; 158 return 0; 159 } 160 161 static struct dmi_system_id ac_dmi_table[] = { 162 { 163 .callback = thinkpad_e530_quirk, 164 .ident = "thinkpad e530", 165 .matches = { 166 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 167 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), 168 }, 169 }, 170 {}, 171 }; 172 173 static int acpi_ac_probe(struct platform_device *pdev) 174 { 175 int result = 0; 176 struct acpi_ac *ac = NULL; 177 struct acpi_device *adev; 178 179 if (!pdev) 180 return -EINVAL; 181 182 adev = ACPI_COMPANION(&pdev->dev); 183 if (!adev) 184 return -ENODEV; 185 186 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 187 if (!ac) 188 return -ENOMEM; 189 190 strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME); 191 strcpy(acpi_device_class(adev), ACPI_AC_CLASS); 192 ac->pdev = pdev; 193 platform_set_drvdata(pdev, ac); 194 195 result = acpi_ac_get_state(ac); 196 if (result) 197 goto end; 198 199 ac->charger.name = acpi_device_bid(adev); 200 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 201 ac->charger.properties = ac_props; 202 ac->charger.num_properties = ARRAY_SIZE(ac_props); 203 ac->charger.get_property = get_ac_property; 204 result = power_supply_register(&pdev->dev, &ac->charger); 205 if (result) 206 goto end; 207 208 result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev), 209 ACPI_ALL_NOTIFY, acpi_ac_notify_handler, ac); 210 if (result) { 211 power_supply_unregister(&ac->charger); 212 goto end; 213 } 214 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 215 acpi_device_name(adev), acpi_device_bid(adev), 216 ac->state ? "on-line" : "off-line"); 217 218 end: 219 if (result) 220 kfree(ac); 221 222 dmi_check_system(ac_dmi_table); 223 return result; 224 } 225 226 #ifdef CONFIG_PM_SLEEP 227 static int acpi_ac_resume(struct device *dev) 228 { 229 struct acpi_ac *ac; 230 unsigned old_state; 231 232 if (!dev) 233 return -EINVAL; 234 235 ac = platform_get_drvdata(to_platform_device(dev)); 236 if (!ac) 237 return -EINVAL; 238 239 old_state = ac->state; 240 if (acpi_ac_get_state(ac)) 241 return 0; 242 if (old_state != ac->state) 243 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 244 return 0; 245 } 246 #endif 247 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume); 248 249 static int acpi_ac_remove(struct platform_device *pdev) 250 { 251 struct acpi_ac *ac; 252 253 if (!pdev) 254 return -EINVAL; 255 256 acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev), 257 ACPI_ALL_NOTIFY, acpi_ac_notify_handler); 258 259 ac = platform_get_drvdata(pdev); 260 if (ac->charger.dev) 261 power_supply_unregister(&ac->charger); 262 263 kfree(ac); 264 265 return 0; 266 } 267 268 static const struct acpi_device_id acpi_ac_match[] = { 269 { "ACPI0003", 0 }, 270 { } 271 }; 272 MODULE_DEVICE_TABLE(acpi, acpi_ac_match); 273 274 static struct platform_driver acpi_ac_driver = { 275 .probe = acpi_ac_probe, 276 .remove = acpi_ac_remove, 277 .driver = { 278 .name = "acpi-ac", 279 .owner = THIS_MODULE, 280 .pm = &acpi_ac_pm_ops, 281 .acpi_match_table = ACPI_PTR(acpi_ac_match), 282 }, 283 }; 284 285 static int __init acpi_ac_init(void) 286 { 287 int result; 288 289 if (acpi_disabled) 290 return -ENODEV; 291 292 result = platform_driver_register(&acpi_ac_driver); 293 if (result < 0) 294 return -ENODEV; 295 296 return 0; 297 } 298 299 static void __exit acpi_ac_exit(void) 300 { 301 platform_driver_unregister(&acpi_ac_driver); 302 } 303 module_init(acpi_ac_init); 304 module_exit(acpi_ac_exit); 305