drivers/misc/eeepc-laptop.c

   1 /*
   2  *  eepc-laptop.c - Asus Eee PC extras
   3  *
   4  *  Based on asus_acpi.c as patched for the Eee PC by Asus:
   5  *  ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
   6  *  Based on eee.c from eeepc-linux
   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
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/types.h>
  23 #include <linux/platform_device.h>
  24 #include <acpi/acpi_drivers.h>
  25 #include <acpi/acpi_bus.h>
  26 #include <linux/uaccess.h>
  27
  28 #define EEEPC_LAPTOP_VERSION    "0.1"
  29
  30 #define EEEPC_HOTK_NAME         "Eee PC Hotkey Driver"
  31 #define EEEPC_HOTK_FILE         "eeepc"
  32 #define EEEPC_HOTK_CLASS        "hotkey"
  33 #define EEEPC_HOTK_DEVICE_NAME  "Hotkey"
  34 #define EEEPC_HOTK_HID          "ASUS010"
  35
  36 #define EEEPC_LOG       EEEPC_HOTK_FILE ": "
  37 #define EEEPC_ERR       KERN_ERR        EEEPC_LOG
  38 #define EEEPC_WARNING   KERN_WARNING    EEEPC_LOG
  39 #define EEEPC_NOTICE    KERN_NOTICE     EEEPC_LOG
  40 #define EEEPC_INFO      KERN_INFO       EEEPC_LOG
  41
  42 /*
  43  * Definitions for Asus EeePC
  44  */
  45 #define NOTIFY_WLAN_ON  0x10
  46
  47 enum {
  48         DISABLE_ASL_WLAN = 0x0001,
  49         DISABLE_ASL_BLUETOOTH = 0x0002,
  50         DISABLE_ASL_IRDA = 0x0004,
  51         DISABLE_ASL_CAMERA = 0x0008,
  52         DISABLE_ASL_TV = 0x0010,
  53         DISABLE_ASL_GPS = 0x0020,
  54         DISABLE_ASL_DISPLAYSWITCH = 0x0040,
  55         DISABLE_ASL_MODEM = 0x0080,
  56         DISABLE_ASL_CARDREADER = 0x0100
  57 };
  58
  59 enum {
  60         CM_ASL_WLAN = 0,
  61         CM_ASL_BLUETOOTH,
  62         CM_ASL_IRDA,
  63         CM_ASL_1394,
  64         CM_ASL_CAMERA,
  65         CM_ASL_TV,
  66         CM_ASL_GPS,
  67         CM_ASL_DVDROM,
  68         CM_ASL_DISPLAYSWITCH,
  69         CM_ASL_PANELBRIGHT,
  70         CM_ASL_BIOSFLASH,
  71         CM_ASL_ACPIFLASH,
  72         CM_ASL_CPUFV,
  73         CM_ASL_CPUTEMPERATURE,
  74         CM_ASL_FANCPU,
  75         CM_ASL_FANCHASSIS,
  76         CM_ASL_USBPORT1,
  77         CM_ASL_USBPORT2,
  78         CM_ASL_USBPORT3,
  79         CM_ASL_MODEM,
  80         CM_ASL_CARDREADER,
  81         CM_ASL_LID
  82 };
  83
  84 const char *cm_getv[] = {
  85         "WLDG", NULL, NULL, NULL,
  86         "CAMG", NULL, NULL, NULL,
  87         NULL, "PBLG", NULL, NULL,
  88         "CFVG", NULL, NULL, NULL,
  89         "USBG", NULL, NULL, "MODG",
  90         "CRDG", "LIDG"
  91 };
  92
  93 const char *cm_setv[] = {
  94         "WLDS", NULL, NULL, NULL,
  95         "CAMS", NULL, NULL, NULL,
  96         "SDSP", "PBLS", "HDPS", NULL,
  97         "CFVS", NULL, NULL, NULL,
  98         "USBG", NULL, NULL, "MODS",
  99         "CRDS", NULL
 100 };
 101
 102 /*
 103  * This is the main structure, we can use it to store useful information
 104  * about the hotk device
 105  */
 106 struct eeepc_hotk {
 107         struct acpi_device *device;     /* the device we are in */
 108         acpi_handle handle;             /* the handle of the hotk device */
 109         u32 cm_supported;               /* the control methods supported
 110                                            by this BIOS */
 111         uint init_flag;                 /* Init flags */
 112         u16 event_count[128];           /* count for each event */
 113 };
 114
 115 /* The actual device the driver binds to */
 116 static struct eeepc_hotk *ehotk;
 117
 118 /* Platform device/driver */
 119 static struct platform_driver platform_driver = {
 120         .driver = {
 121                 .name = EEEPC_HOTK_FILE,
 122                 .owner = THIS_MODULE,
 123         }
 124 };
 125
 126 static struct platform_device *platform_device;
 127
 128 /*
 129  * The hotkey driver declaration
 130  */
 131 static int eeepc_hotk_add(struct acpi_device *device);
 132 static int eeepc_hotk_remove(struct acpi_device *device, int type);
 133
 134 static const struct acpi_device_id eeepc_device_ids[] = {
 135         {EEEPC_HOTK_HID, 0},
 136         {"", 0},
 137 };
 138 MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);
 139
 140 static struct acpi_driver eeepc_hotk_driver = {
 141         .name = EEEPC_HOTK_NAME,
 142         .class = EEEPC_HOTK_CLASS,
 143         .ids = eeepc_device_ids,
 144         .ops = {
 145                 .add = eeepc_hotk_add,
 146                 .remove = eeepc_hotk_remove,
 147         },
 148 };
 149
 150 MODULE_AUTHOR("Corentin Chary, Eric Cooper");
 151 MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
 152 MODULE_LICENSE("GPL");
 153
 154 /*
 155  * ACPI Helpers
 156  */
 157 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 158                           struct acpi_buffer *output)
 159 {
 160         struct acpi_object_list params;
 161         union acpi_object in_obj;
 162         acpi_status status;
 163
 164         params.count = 1;
 165         params.pointer = &in_obj;
 166         in_obj.type = ACPI_TYPE_INTEGER;
 167         in_obj.integer.value = val;
 168
 169         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 170         return (status == AE_OK ? 0 : -1);
 171 }
 172
 173 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 174 {
 175         acpi_status status;
 176         ulong result;
 177
 178         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 179         if (ACPI_FAILURE(status)) {
 180                 *val = -1;
 181                 return -1;
 182         } else {
 183                 *val = result;
 184                 return 0;
 185         }
 186 }
 187
 188 static int set_acpi(int cm, int value)
 189 {
 190         if (ehotk->cm_supported & (0x1 << cm)) {
 191                 const char *method = cm_setv[cm];
 192                 if (method == NULL)
 193                         return -ENODEV;
 194                 if (write_acpi_int(ehotk->handle, method, value, NULL))
 195                         printk(EEEPC_WARNING "Error writing %s\n", method);
 196         }
 197         return 0;
 198 }
 199
 200 static int get_acpi(int cm)
 201 {
 202         int value = -1;
 203         if ((ehotk->cm_supported & (0x1 << cm))) {
 204                 const char *method = cm_getv[cm];
 205                 if (method == NULL)
 206                         return -ENODEV;
 207                 if (read_acpi_int(ehotk->handle, method, &value))
 208                         printk(EEEPC_WARNING "Error reading %s\n", method);
 209         }
 210         return value;
 211 }
 212
 213 /*
 214  * Sys helpers
 215  */
 216 static int parse_arg(const char *buf, unsigned long count, int *val)
 217 {
 218         if (!count)
 219                 return 0;
 220         if (sscanf(buf, "%i", val) != 1)
 221                 return -EINVAL;
 222         return count;
 223 }
 224
 225 static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
 226 {
 227         int rv, value;
 228
 229         rv = parse_arg(buf, count, &value);
 230         if (rv > 0)
 231                 set_acpi(cm, value);
 232         return rv;
 233 }
 234
 235 static ssize_t show_sys_acpi(int cm, char *buf)
 236 {
 237         return sprintf(buf, "%d\n", get_acpi(cm));
 238 }
 239
 240 #define EEEPC_CREATE_DEVICE_ATTR(_name, _cm)                            \
 241         static ssize_t show_##_name(struct device *dev,                 \
 242                                     struct device_attribute *attr,      \
 243                                     char *buf)                          \
 244         {                                                               \
 245                 return show_sys_acpi(_cm, buf);                         \
 246         }                                                               \
 247         static ssize_t store_##_name(struct device *dev,                \
 248                                      struct device_attribute *attr,     \
 249                                      const char *buf, size_t count)     \
 250         {                                                               \
 251                 return store_sys_acpi(_cm, buf, count);                 \
 252         }                                                               \
 253         static struct device_attribute dev_attr_##_name = {             \
 254                 .attr = {                                               \
 255                         .name = __stringify(_name),                     \
 256                         .mode = 0644 },                                 \
 257                 .show   = show_##_name,                                 \
 258                 .store  = store_##_name,                                \
 259         }
 260
 261 EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
 262 EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
 263 EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
 264 EEEPC_CREATE_DEVICE_ATTR(wlan, CM_ASL_WLAN);
 265
 266 static struct attribute *platform_attributes[] = {
 267         &dev_attr_camera.attr,
 268         &dev_attr_cardr.attr,
 269         &dev_attr_disp.attr,
 270         &dev_attr_wlan.attr,
 271         NULL
 272 };
 273
 274 static struct attribute_group platform_attribute_group = {
 275         .attrs = platform_attributes
 276 };
 277
 278 /*
 279  * Hotkey functions
 280  */
 281 static int eeepc_hotk_check(void)
 282 {
 283         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 284         int result;
 285
 286         result = acpi_bus_get_status(ehotk->device);
 287         if (result)
 288                 return result;
 289         if (ehotk->device->status.present) {
 290                 if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
 291                                     &buffer)) {
 292                         printk(EEEPC_ERR "Hotkey initialization failed\n");
 293                         return -ENODEV;
 294                 } else {
 295                         printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
 296                                ehotk->init_flag);
 297                 }
 298                 /* get control methods supported */
 299                 if (read_acpi_int(ehotk->handle, "CMSG"
 300                                    , &ehotk->cm_supported)) {
 301                         printk(EEEPC_ERR
 302                                "Get control methods supported failed\n");
 303                         return -ENODEV;
 304                 } else {
 305                         printk(EEEPC_INFO
 306                                "Get control methods supported: 0x%x\n",
 307                                ehotk->cm_supported);
 308                 }
 309         } else {
 310                 printk(EEEPC_ERR "Hotkey device not present, aborting\n");
 311                 return -EINVAL;
 312         }
 313         return 0;
 314 }
 315
 316 static void notify_wlan(u32 *event)
 317 {
 318         /* if DISABLE_ASL_WLAN is set, the notify code for fn+f2
 319            will always be 0x10 */
 320         if (ehotk->cm_supported & (0x1 << CM_ASL_WLAN)) {
 321                 const char *method = cm_getv[CM_ASL_WLAN];
 322                 int value;
 323                 if (read_acpi_int(ehotk->handle, method, &value))
 324                         printk(EEEPC_WARNING "Error reading %s\n",
 325                                method);
 326                 else if (value == 1)
 327                         *event = 0x11;
 328         }
 329 }
 330
 331 static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
 332 {
 333         if (!ehotk)
 334                 return;
 335         if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
 336                 notify_wlan(&event);
 337         acpi_bus_generate_proc_event(ehotk->device, event,
 338                                      ehotk->event_count[event % 128]++);
 339 }
 340
 341 static int eeepc_hotk_add(struct acpi_device *device)
 342 {
 343         acpi_status status = AE_OK;
 344         int result;
 345
 346         if (!device)
 347                  return -EINVAL;
 348         printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
 349         ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
 350         if (!ehotk)
 351                 return -ENOMEM;
 352         ehotk->init_flag = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
 353         ehotk->handle = device->handle;
 354         strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
 355         strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
 356         acpi_driver_data(device) = ehotk;
 357         ehotk->device = device;
 358         result = eeepc_hotk_check();
 359         if (result)
 360                 goto end;
 361         status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 362                                              eeepc_hotk_notify, ehotk);
 363         if (ACPI_FAILURE(status))
 364                 printk(EEEPC_ERR "Error installing notify handler\n");
 365  end:
 366         if (result) {
 367                 kfree(ehotk);
 368                 ehotk = NULL;
 369         }
 370         return result;
 371 }
 372
 373 static int eeepc_hotk_remove(struct acpi_device *device, int type)
 374 {
 375         acpi_status status = 0;
 376
 377         if (!device || !acpi_driver_data(device))
 378                  return -EINVAL;
 379         status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 380                                             eeepc_hotk_notify);
 381         if (ACPI_FAILURE(status))
 382                 printk(EEEPC_ERR "Error removing notify handler\n");
 383         kfree(ehotk);
 384         return 0;
 385 }
 386
 387 /*
 388  * exit/init
 389  */
 390 static void __exit eeepc_laptop_exit(void)
 391 {
 392         acpi_bus_unregister_driver(&eeepc_hotk_driver);
 393         sysfs_remove_group(&platform_device->dev.kobj,
 394                            &platform_attribute_group);
 395         platform_device_unregister(platform_device);
 396         platform_driver_unregister(&platform_driver);
 397 }
 398
 399 static int __init eeepc_laptop_init(void)
 400 {
 401         struct device *dev;
 402         int result;
 403
 404         if (acpi_disabled)
 405                 return -ENODEV;
 406         result = acpi_bus_register_driver(&eeepc_hotk_driver);
 407         if (result < 0)
 408                 return result;
 409         if (!ehotk) {
 410                 acpi_bus_unregister_driver(&eeepc_hotk_driver);
 411                 return -ENODEV;
 412         }
 413         dev = acpi_get_physical_device(ehotk->device->handle);
 414         /* Register platform stuff */
 415         result = platform_driver_register(&platform_driver);
 416         if (result)
 417                 goto fail_platform_driver;
 418         platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
 419         if (!platform_device) {
 420                 result = -ENOMEM;
 421                 goto fail_platform_device1;
 422         }
 423         result = platform_device_add(platform_device);
 424         if (result)
 425                 goto fail_platform_device2;
 426         result = sysfs_create_group(&platform_device->dev.kobj,
 427                                     &platform_attribute_group);
 428         if (result)
 429                 goto fail_sysfs;
 430         return 0;
 431 fail_sysfs:
 432         platform_device_del(platform_device);
 433 fail_platform_device2:
 434         platform_device_put(platform_device);
 435 fail_platform_device1:
 436         platform_driver_unregister(&platform_driver);
 437 fail_platform_driver:
 438         return result;
 439 }
 440
 441 module_init(eeepc_laptop_init);
 442 module_exit(eeepc_laptop_exit);