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 #include <acpi/actypes.h>
  27
  28 #include "../base.h"
  29 #include "pnpacpi.h"
  30
  31 static int num = 0;
  32
  33 /* We need only to blacklist devices that have already an acpi driver that
  34  * can't use pnp layer. We don't need to blacklist device that are directly
  35  * used by the kernel (PCI root, ...), as it is harmless and there were
  36  * already present in pnpbios. But there is an exception for devices that
  37  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  38  * Finally, only devices that have a CRS method need to be in this list.
  39  */
  40 static struct acpi_device_id excluded_id_list[] __initdata = {
  41         {"PNP0C09", 0},         /* EC */
  42         {"PNP0C0F", 0},         /* Link device */
  43         {"PNP0000", 0},         /* PIC */
  44         {"PNP0100", 0},         /* Timer */
  45         {"", 0},
  46 };
  47
  48 static inline int __init is_exclusive_device(struct acpi_device *dev)
  49 {
  50         return (!acpi_match_device_ids(dev, excluded_id_list));
  51 }
  52
  53 /*
  54  * Compatible Device IDs
  55  */
  56 #define TEST_HEX(c) \
  57         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  58                 return 0
  59 #define TEST_ALPHA(c) \
  60         if (!('@' <= (c) || (c) <= 'Z')) \
  61                 return 0
  62 static int __init ispnpidacpi(char *id)
  63 {
  64         TEST_ALPHA(id[0]);
  65         TEST_ALPHA(id[1]);
  66         TEST_ALPHA(id[2]);
  67         TEST_HEX(id[3]);
  68         TEST_HEX(id[4]);
  69         TEST_HEX(id[5]);
  70         TEST_HEX(id[6]);
  71         if (id[7] != '\0')
  72                 return 0;
  73         return 1;
  74 }
  75
  76 static int pnpacpi_get_resources(struct pnp_dev *dev)
  77 {
  78         dev_dbg(&dev->dev, "get resources\n");
  79         return pnpacpi_parse_allocated_resource(dev);
  80 }
  81
  82 static int pnpacpi_set_resources(struct pnp_dev *dev)
  83 {
  84         acpi_handle handle = dev->data;
  85         struct acpi_buffer buffer;
  86         int ret;
  87
  88         dev_dbg(&dev->dev, "set resources\n");
  89         ret = pnpacpi_build_resource_template(dev, &buffer);
  90         if (ret)
  91                 return ret;
  92         ret = pnpacpi_encode_resources(dev, &buffer);
  93         if (ret) {
  94                 kfree(buffer.pointer);
  95                 return ret;
  96         }
  97         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
  98                 ret = -EINVAL;
  99         else if (acpi_bus_power_manageable(handle))
 100                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 101         kfree(buffer.pointer);
 102         return ret;
 103 }
 104
 105 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 106 {
 107         acpi_handle handle = dev->data;
 108         int ret;
 109
 110         dev_dbg(&dev->dev, "disable resources\n");
 111
 112         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 113         ret = 0;
 114         if (acpi_bus_power_manageable(handle)) {
 115                 ret = acpi_bus_set_power(handle, ACPI_STATE_D3);
 116                 if (ret)
 117                         return ret;
 118         }
 119         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 120                 ret = -ENODEV;
 121         return ret;
 122 }
 123
 124 #ifdef CONFIG_ACPI_SLEEP
 125 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 126 {
 127         int power_state;
 128
 129         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 130         if (power_state < 0)
 131                 power_state = (state.event == PM_EVENT_ON) ?
 132                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 133
 134         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 135 }
 136
 137 static int pnpacpi_resume(struct pnp_dev *dev)
 138 {
 139         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 140 }
 141 #endif
 142
 143 static struct pnp_protocol pnpacpi_protocol = {
 144         .name    = "Plug and Play ACPI",
 145         .get     = pnpacpi_get_resources,
 146         .set     = pnpacpi_set_resources,
 147         .disable = pnpacpi_disable_resources,
 148 #ifdef CONFIG_ACPI_SLEEP
 149         .suspend = pnpacpi_suspend,
 150         .resume = pnpacpi_resume,
 151 #endif
 152 };
 153
 154 static int __init pnpacpi_add_device(struct acpi_device *device)
 155 {
 156         acpi_handle temp = NULL;
 157         acpi_status status;
 158         struct pnp_dev *dev;
 159
 160         /*
 161          * If a PnPacpi device is not present , the device
 162          * driver should not be loaded.
 163          */
 164         status = acpi_get_handle(device->handle, "_CRS", &temp);
 165         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 166             is_exclusive_device(device) || (!device->status.present))
 167                 return 0;
 168
 169         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 170         if (!dev)
 171                 return -ENOMEM;
 172
 173         dev->data = device->handle;
 174         /* .enabled means the device can decode the resources */
 175         dev->active = device->status.enabled;
 176         status = acpi_get_handle(device->handle, "_SRS", &temp);
 177         if (ACPI_SUCCESS(status))
 178                 dev->capabilities |= PNP_CONFIGURABLE;
 179         dev->capabilities |= PNP_READ;
 180         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 181                 dev->capabilities |= PNP_WRITE;
 182         if (device->flags.removable)
 183                 dev->capabilities |= PNP_REMOVABLE;
 184         status = acpi_get_handle(device->handle, "_DIS", &temp);
 185         if (ACPI_SUCCESS(status))
 186                 dev->capabilities |= PNP_DISABLE;
 187
 188         if (strlen(acpi_device_name(device)))
 189                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 190         else
 191                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 192
 193         if (dev->active)
 194                 pnpacpi_parse_allocated_resource(dev);
 195
 196         if (dev->capabilities & PNP_CONFIGURABLE)
 197                 pnpacpi_parse_resource_option_data(dev);
 198
 199         if (device->flags.compatible_ids) {
 200                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 201                 int i;
 202
 203                 for (i = 0; i < cid_list->count; i++) {
 204                         if (!ispnpidacpi(cid_list->id[i].value))
 205                                 continue;
 206                         pnp_add_id(dev, cid_list->id[i].value);
 207                 }
 208         }
 209
 210         /* clear out the damaged flags */
 211         if (!dev->active)
 212                 pnp_init_resources(dev);
 213         pnp_add_device(dev);
 214         num++;
 215
 216         return AE_OK;
 217 }
 218
 219 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 220                                                      u32 lvl, void *context,
 221                                                      void **rv)
 222 {
 223         struct acpi_device *device;
 224
 225         if (!acpi_bus_get_device(handle, &device))
 226                 pnpacpi_add_device(device);
 227         else
 228                 return AE_CTRL_DEPTH;
 229         return AE_OK;
 230 }
 231
 232 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 233 {
 234         struct acpi_device *acpi = to_acpi_device(dev);
 235         struct pnp_dev *pnp = _pnp;
 236
 237         /* true means it matched */
 238         return acpi->flags.hardware_id
 239             && !acpi_get_physical_device(acpi->handle)
 240             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 241 }
 242
 243 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 244 {
 245         struct device *adev;
 246         struct acpi_device *acpi;
 247
 248         adev = bus_find_device(&acpi_bus_type, NULL,
 249                                to_pnp_dev(dev), acpi_pnp_match);
 250         if (!adev)
 251                 return -ENODEV;
 252
 253         acpi = to_acpi_device(adev);
 254         *handle = acpi->handle;
 255         put_device(adev);
 256         return 0;
 257 }
 258
 259 /* complete initialization of a PNPACPI device includes having
 260  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 261  */
 262 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 263         .bus         = &pnp_bus_type,
 264         .find_device = acpi_pnp_find_device,
 265 };
 266
 267 int pnpacpi_disabled __initdata;
 268 static int __init pnpacpi_init(void)
 269 {
 270         if (acpi_disabled || pnpacpi_disabled) {
 271                 pnp_info("PnP ACPI: disabled");
 272                 return 0;
 273         }
 274         pnp_info("PnP ACPI init");
 275         pnp_register_protocol(&pnpacpi_protocol);
 276         register_acpi_bus_type(&acpi_pnp_bus);
 277         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 278         pnp_info("PnP ACPI: found %d devices", num);
 279         unregister_acpi_bus_type(&acpi_pnp_bus);
 280         pnp_platform_devices = 1;
 281         return 0;
 282 }
 283
 284 subsys_initcall(pnpacpi_init);
 285
 286 static int __init pnpacpi_setup(char *str)
 287 {
 288         if (str == NULL)
 289                 return 1;
 290         if (!strncmp(str, "off", 3))
 291                 pnpacpi_disabled = 1;
 292         return 1;
 293 }
 294
 295 __setup("pnpacpi=", pnpacpi_setup);