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         acpi_status status;
  88
  89         dev_dbg(&dev->dev, "set resources\n");
  90         ret = pnpacpi_build_resource_template(dev, &buffer);
  91         if (ret)
  92                 return ret;
  93         ret = pnpacpi_encode_resources(dev, &buffer);
  94         if (ret) {
  95                 kfree(buffer.pointer);
  96                 return ret;
  97         }
  98         status = acpi_set_current_resources(handle, &buffer);
  99         if (ACPI_FAILURE(status))
 100                 ret = -EINVAL;
 101         kfree(buffer.pointer);
 102         return ret;
 103 }
 104
 105 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 106 {
 107         acpi_status status;
 108
 109         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 110         status = acpi_evaluate_object((acpi_handle) dev->data,
 111                                       "_DIS", NULL, NULL);
 112         return ACPI_FAILURE(status) ? -ENODEV : 0;
 113 }
 114
 115 #ifdef CONFIG_ACPI_SLEEP
 116 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 117 {
 118         int power_state;
 119
 120         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 121         if (power_state < 0)
 122                 power_state = (state.event == PM_EVENT_ON) ?
 123                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 124
 125         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 126 }
 127
 128 static int pnpacpi_resume(struct pnp_dev *dev)
 129 {
 130         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 131 }
 132 #endif
 133
 134 static struct pnp_protocol pnpacpi_protocol = {
 135         .name    = "Plug and Play ACPI",
 136         .get     = pnpacpi_get_resources,
 137         .set     = pnpacpi_set_resources,
 138         .disable = pnpacpi_disable_resources,
 139 #ifdef CONFIG_ACPI_SLEEP
 140         .suspend = pnpacpi_suspend,
 141         .resume = pnpacpi_resume,
 142 #endif
 143 };
 144
 145 static int __init pnpacpi_add_device(struct acpi_device *device)
 146 {
 147         acpi_handle temp = NULL;
 148         acpi_status status;
 149         struct pnp_dev *dev;
 150
 151         status = acpi_get_handle(device->handle, "_CRS", &temp);
 152         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 153             is_exclusive_device(device))
 154                 return 0;
 155
 156         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 157         if (!dev)
 158                 return -ENOMEM;
 159
 160         dev->data = device->handle;
 161         /* .enabled means the device can decode the resources */
 162         dev->active = device->status.enabled;
 163         status = acpi_get_handle(device->handle, "_SRS", &temp);
 164         if (ACPI_SUCCESS(status))
 165                 dev->capabilities |= PNP_CONFIGURABLE;
 166         dev->capabilities |= PNP_READ;
 167         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 168                 dev->capabilities |= PNP_WRITE;
 169         if (device->flags.removable)
 170                 dev->capabilities |= PNP_REMOVABLE;
 171         status = acpi_get_handle(device->handle, "_DIS", &temp);
 172         if (ACPI_SUCCESS(status))
 173                 dev->capabilities |= PNP_DISABLE;
 174
 175         if (strlen(acpi_device_name(device)))
 176                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 177         else
 178                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 179
 180         if (dev->active)
 181                 pnpacpi_parse_allocated_resource(dev);
 182
 183         if (dev->capabilities & PNP_CONFIGURABLE)
 184                 pnpacpi_parse_resource_option_data(dev);
 185
 186         if (device->flags.compatible_ids) {
 187                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 188                 int i;
 189
 190                 for (i = 0; i < cid_list->count; i++) {
 191                         if (!ispnpidacpi(cid_list->id[i].value))
 192                                 continue;
 193                         pnp_add_id(dev, cid_list->id[i].value);
 194                 }
 195         }
 196
 197         /* clear out the damaged flags */
 198         if (!dev->active)
 199                 pnp_init_resources(dev);
 200         pnp_add_device(dev);
 201         num++;
 202
 203         return AE_OK;
 204 }
 205
 206 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 207                                                      u32 lvl, void *context,
 208                                                      void **rv)
 209 {
 210         struct acpi_device *device;
 211
 212         if (!acpi_bus_get_device(handle, &device))
 213                 pnpacpi_add_device(device);
 214         else
 215                 return AE_CTRL_DEPTH;
 216         return AE_OK;
 217 }
 218
 219 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 220 {
 221         struct acpi_device *acpi = to_acpi_device(dev);
 222         struct pnp_dev *pnp = _pnp;
 223
 224         /* true means it matched */
 225         return acpi->flags.hardware_id
 226             && !acpi_get_physical_device(acpi->handle)
 227             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 228 }
 229
 230 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 231 {
 232         struct device *adev;
 233         struct acpi_device *acpi;
 234
 235         adev = bus_find_device(&acpi_bus_type, NULL,
 236                                to_pnp_dev(dev), acpi_pnp_match);
 237         if (!adev)
 238                 return -ENODEV;
 239
 240         acpi = to_acpi_device(adev);
 241         *handle = acpi->handle;
 242         put_device(adev);
 243         return 0;
 244 }
 245
 246 /* complete initialization of a PNPACPI device includes having
 247  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 248  */
 249 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 250         .bus         = &pnp_bus_type,
 251         .find_device = acpi_pnp_find_device,
 252 };
 253
 254 int pnpacpi_disabled __initdata;
 255 static int __init pnpacpi_init(void)
 256 {
 257         if (acpi_disabled || pnpacpi_disabled) {
 258                 pnp_info("PnP ACPI: disabled");
 259                 return 0;
 260         }
 261         pnp_info("PnP ACPI init");
 262         pnp_register_protocol(&pnpacpi_protocol);
 263         register_acpi_bus_type(&acpi_pnp_bus);
 264         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 265         pnp_info("PnP ACPI: found %d devices", num);
 266         unregister_acpi_bus_type(&acpi_pnp_bus);
 267         pnp_platform_devices = 1;
 268         return 0;
 269 }
 270
 271 fs_initcall(pnpacpi_init);
 272
 273 static int __init pnpacpi_setup(char *str)
 274 {
 275         if (str == NULL)
 276                 return 1;
 277         if (!strncmp(str, "off", 3))
 278                 pnpacpi_disabled = 1;
 279         return 1;
 280 }
 281
 282 __setup("pnpacpi=", pnpacpi_setup);