drivers/pnp/pnpacpi/core.c

   1 /*
   2  * pnpacpi -- PnP ACPI driver
   3  *
   4  * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
   5  * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/acpi.h>
  23 #include <linux/pnp.h>
  24 #include <linux/mod_devicetable.h>
  25 #include <acpi/acpi_bus.h>
  26
  27 #include "../base.h"
  28 #include "pnpacpi.h"
  29
  30 static int num = 0;
  31
  32 /* We need only to blacklist devices that have already an acpi driver that
  33  * can't use pnp layer. We don't need to blacklist device that are directly
  34  * used by the kernel (PCI root, ...), as it is harmless and there were
  35  * already present in pnpbios. But there is an exception for devices that
  36  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  37  * Finally, only devices that have a CRS method need to be in this list.
  38  */
  39 static struct acpi_device_id excluded_id_list[] __initdata = {
  40         {"PNP0C09", 0},         /* EC */
  41         {"PNP0C0F", 0},         /* Link device */
  42         {"PNP0000", 0},         /* PIC */
  43         {"PNP0100", 0},         /* Timer */
  44         {"", 0},
  45 };
  46
  47 static inline int __init is_exclusive_device(struct acpi_device *dev)
  48 {
  49         return (!acpi_match_device_ids(dev, excluded_id_list));
  50 }
  51
  52 /*
  53  * Compatible Device IDs
  54  */
  55 #define TEST_HEX(c) \
  56         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  57                 return 0
  58 #define TEST_ALPHA(c) \
  59         if (!('@' <= (c) || (c) <= 'Z')) \
  60                 return 0
  61 static int __init ispnpidacpi(char *id)
  62 {
  63         TEST_ALPHA(id[0]);
  64         TEST_ALPHA(id[1]);
  65         TEST_ALPHA(id[2]);
  66         TEST_HEX(id[3]);
  67         TEST_HEX(id[4]);
  68         TEST_HEX(id[5]);
  69         TEST_HEX(id[6]);
  70         if (id[7] != '\0')
  71                 return 0;
  72         return 1;
  73 }
  74
  75 static int pnpacpi_get_resources(struct pnp_dev *dev)
  76 {
  77         pnp_dbg(&dev->dev, "get resources\n");
  78         return pnpacpi_parse_allocated_resource(dev);
  79 }
  80
  81 static int pnpacpi_set_resources(struct pnp_dev *dev)
  82 {
  83         acpi_handle handle = dev->data;
  84         struct acpi_buffer buffer;
  85         int ret;
  86
  87         pnp_dbg(&dev->dev, "set resources\n");
  88         ret = pnpacpi_build_resource_template(dev, &buffer);
  89         if (ret)
  90                 return ret;
  91         ret = pnpacpi_encode_resources(dev, &buffer);
  92         if (ret) {
  93                 kfree(buffer.pointer);
  94                 return ret;
  95         }
  96         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
  97                 ret = -EINVAL;
  98         else if (acpi_bus_power_manageable(handle))
  99                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 100         kfree(buffer.pointer);
 101         return ret;
 102 }
 103
 104 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 105 {
 106         acpi_handle handle = dev->data;
 107         int ret;
 108
 109         dev_dbg(&dev->dev, "disable resources\n");
 110
 111         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 112         ret = 0;
 113         if (acpi_bus_power_manageable(handle))
 114                 acpi_bus_set_power(handle, ACPI_STATE_D3);
 115                 /* continue even if acpi_bus_set_power() fails */
 116         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 117                 ret = -ENODEV;
 118         return ret;
 119 }
 120
 121 #ifdef CONFIG_ACPI_SLEEP
 122 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 123 {
 124         int power_state;
 125
 126         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 127         if (power_state < 0)
 128                 power_state = (state.event == PM_EVENT_ON) ?
 129                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 130
 131         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 132 }
 133
 134 static int pnpacpi_resume(struct pnp_dev *dev)
 135 {
 136         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 137 }
 138 #endif
 139
 140 static struct pnp_protocol pnpacpi_protocol = {
 141         .name    = "Plug and Play ACPI",
 142         .get     = pnpacpi_get_resources,
 143         .set     = pnpacpi_set_resources,
 144         .disable = pnpacpi_disable_resources,
 145 #ifdef CONFIG_ACPI_SLEEP
 146         .suspend = pnpacpi_suspend,
 147         .resume = pnpacpi_resume,
 148 #endif
 149 };
 150
 151 static int __init pnpacpi_add_device(struct acpi_device *device)
 152 {
 153         acpi_handle temp = NULL;
 154         acpi_status status;
 155         struct pnp_dev *dev;
 156         struct acpi_hardware_id *id;
 157
 158         /*
 159          * If a PnPacpi device is not present , the device
 160          * driver should not be loaded.
 161          */
 162         status = acpi_get_handle(device->handle, "_CRS", &temp);
 163         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 164             is_exclusive_device(device) || (!device->status.present))
 165                 return 0;
 166
 167         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 168         if (!dev)
 169                 return -ENOMEM;
 170
 171         dev->data = device->handle;
 172         /* .enabled means the device can decode the resources */
 173         dev->active = device->status.enabled;
 174         status = acpi_get_handle(device->handle, "_SRS", &temp);
 175         if (ACPI_SUCCESS(status))
 176                 dev->capabilities |= PNP_CONFIGURABLE;
 177         dev->capabilities |= PNP_READ;
 178         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 179                 dev->capabilities |= PNP_WRITE;
 180         if (device->flags.removable)
 181                 dev->capabilities |= PNP_REMOVABLE;
 182         status = acpi_get_handle(device->handle, "_DIS", &temp);
 183         if (ACPI_SUCCESS(status))
 184                 dev->capabilities |= PNP_DISABLE;
 185
 186         if (strlen(acpi_device_name(device)))
 187                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 188         else
 189                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 190
 191         if (dev->active)
 192                 pnpacpi_parse_allocated_resource(dev);
 193
 194         if (dev->capabilities & PNP_CONFIGURABLE)
 195                 pnpacpi_parse_resource_option_data(dev);
 196
 197         list_for_each_entry(id, &device->pnp.ids, list) {
 198                 if (!strcmp(id->id, acpi_device_hid(device)))
 199                         continue;
 200                 if (!ispnpidacpi(id->id))
 201                         continue;
 202                 pnp_add_id(dev, id->id);
 203         }
 204
 205         /* clear out the damaged flags */
 206         if (!dev->active)
 207                 pnp_init_resources(dev);
 208         pnp_add_device(dev);
 209         num++;
 210
 211         return AE_OK;
 212 }
 213
 214 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 215                                                      u32 lvl, void *context,
 216                                                      void **rv)
 217 {
 218         struct acpi_device *device;
 219
 220         if (!acpi_bus_get_device(handle, &device))
 221                 pnpacpi_add_device(device);
 222         else
 223                 return AE_CTRL_DEPTH;
 224         return AE_OK;
 225 }
 226
 227 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 228 {
 229         struct acpi_device *acpi = to_acpi_device(dev);
 230         struct pnp_dev *pnp = _pnp;
 231
 232         /* true means it matched */
 233         return !acpi_get_physical_device(acpi->handle)
 234             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 235 }
 236
 237 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 238 {
 239         struct device *adev;
 240         struct acpi_device *acpi;
 241
 242         adev = bus_find_device(&acpi_bus_type, NULL,
 243                                to_pnp_dev(dev), acpi_pnp_match);
 244         if (!adev)
 245                 return -ENODEV;
 246
 247         acpi = to_acpi_device(adev);
 248         *handle = acpi->handle;
 249         put_device(adev);
 250         return 0;
 251 }
 252
 253 /* complete initialization of a PNPACPI device includes having
 254  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 255  */
 256 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 257         .bus         = &pnp_bus_type,
 258         .find_device = acpi_pnp_find_device,
 259 };
 260
 261 int pnpacpi_disabled __initdata;
 262 static int __init pnpacpi_init(void)
 263 {
 264         if (acpi_disabled || pnpacpi_disabled) {
 265                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 266                 return 0;
 267         }
 268         printk(KERN_INFO "pnp: PnP ACPI init\n");
 269         pnp_register_protocol(&pnpacpi_protocol);
 270         register_acpi_bus_type(&acpi_pnp_bus);
 271         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 272         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 273         unregister_acpi_bus_type(&acpi_pnp_bus);
 274         pnp_platform_devices = 1;
 275         return 0;
 276 }
 277
 278 fs_initcall(pnpacpi_init);
 279
 280 static int __init pnpacpi_setup(char *str)
 281 {
 282         if (str == NULL)
 283                 return 1;
 284         if (!strncmp(str, "off", 3))
 285                 pnpacpi_disabled = 1;
 286         return 1;
 287 }
 288
 289 __setup("pnpacpi=", pnpacpi_setup);