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   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 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         acpi_status status;
  79
  80         status = pnpacpi_parse_allocated_resource(dev);
  81         return ACPI_FAILURE(status) ? -ENODEV : 0;
  82 }
  83
  84 static int pnpacpi_set_resources(struct pnp_dev *dev)
  85 {
  86         acpi_handle handle = dev->data;
  87         struct acpi_buffer buffer;
  88         int ret;
  89         acpi_status status;
  90
  91         ret = pnpacpi_build_resource_template(dev, &buffer);
  92         if (ret)
  93                 return ret;
  94         ret = pnpacpi_encode_resources(dev, &buffer);
  95         if (ret) {
  96                 kfree(buffer.pointer);
  97                 return ret;
  98         }
  99         status = acpi_set_current_resources(handle, &buffer);
 100         if (ACPI_FAILURE(status))
 101                 ret = -EINVAL;
 102         kfree(buffer.pointer);
 103         return ret;
 104 }
 105
 106 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 107 {
 108         acpi_status status;
 109
 110         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 111         status = acpi_evaluate_object((acpi_handle) dev->data,
 112                                       "_DIS", NULL, NULL);
 113         return ACPI_FAILURE(status) ? -ENODEV : 0;
 114 }
 115
 116 #ifdef CONFIG_ACPI_SLEEP
 117 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 118 {
 119         int power_state;
 120
 121         power_state = acpi_pm_device_sleep_state(&dev->dev,
 122                                                 device_may_wakeup(&dev->dev),
 123                                                 NULL);
 124         if (power_state < 0)
 125                 power_state = (state.event == PM_EVENT_ON) ?
 126                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 127
 128         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 129 }
 130
 131 static int pnpacpi_resume(struct pnp_dev *dev)
 132 {
 133         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 134 }
 135 #endif
 136
 137 static struct pnp_protocol pnpacpi_protocol = {
 138         .name    = "Plug and Play ACPI",
 139         .get     = pnpacpi_get_resources,
 140         .set     = pnpacpi_set_resources,
 141         .disable = pnpacpi_disable_resources,
 142 #ifdef CONFIG_ACPI_SLEEP
 143         .suspend = pnpacpi_suspend,
 144         .resume = pnpacpi_resume,
 145 #endif
 146 };
 147
 148 static int __init pnpacpi_add_device(struct acpi_device *device)
 149 {
 150         acpi_handle temp = NULL;
 151         acpi_status status;
 152         struct pnp_dev *dev;
 153
 154         status = acpi_get_handle(device->handle, "_CRS", &temp);
 155         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 156             is_exclusive_device(device))
 157                 return 0;
 158
 159         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 160         if (!dev)
 161                 return -ENOMEM;
 162
 163         dev->data = device->handle;
 164         /* .enabled means the device can decode the resources */
 165         dev->active = device->status.enabled;
 166         status = acpi_get_handle(device->handle, "_SRS", &temp);
 167         if (ACPI_SUCCESS(status))
 168                 dev->capabilities |= PNP_CONFIGURABLE;
 169         dev->capabilities |= PNP_READ;
 170         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 171                 dev->capabilities |= PNP_WRITE;
 172         if (device->flags.removable)
 173                 dev->capabilities |= PNP_REMOVABLE;
 174         status = acpi_get_handle(device->handle, "_DIS", &temp);
 175         if (ACPI_SUCCESS(status))
 176                 dev->capabilities |= PNP_DISABLE;
 177
 178         if (strlen(acpi_device_name(device)))
 179                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 180         else
 181                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 182
 183         if (dev->active) {
 184                 /* parse allocated resource */
 185                 status = pnpacpi_parse_allocated_resource(dev);
 186                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 187                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
 188                                 acpi_device_hid(device));
 189                 }
 190         }
 191
 192         if (dev->capabilities & PNP_CONFIGURABLE) {
 193                 status = pnpacpi_parse_resource_option_data(dev);
 194                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 195                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
 196                                 acpi_device_hid(device));
 197                 }
 198         }
 199
 200         if (device->flags.compatible_ids) {
 201                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 202                 int i;
 203
 204                 for (i = 0; i < cid_list->count; i++) {
 205                         if (!ispnpidacpi(cid_list->id[i].value))
 206                                 continue;
 207                         pnp_add_id(dev, cid_list->id[i].value);
 208                 }
 209         }
 210
 211         /* clear out the damaged flags */
 212         if (!dev->active)
 213                 pnp_init_resource_table(&dev->res);
 214         pnp_add_device(dev);
 215         num++;
 216
 217         return AE_OK;
 218 }
 219
 220 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 221                                                      u32 lvl, void *context,
 222                                                      void **rv)
 223 {
 224         struct acpi_device *device;
 225
 226         if (!acpi_bus_get_device(handle, &device))
 227                 pnpacpi_add_device(device);
 228         else
 229                 return AE_CTRL_DEPTH;
 230         return AE_OK;
 231 }
 232
 233 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 234 {
 235         struct acpi_device *acpi = to_acpi_device(dev);
 236         struct pnp_dev *pnp = _pnp;
 237
 238         /* true means it matched */
 239         return acpi->flags.hardware_id
 240             && !acpi_get_physical_device(acpi->handle)
 241             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 242 }
 243
 244 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 245 {
 246         struct device *adev;
 247         struct acpi_device *acpi;
 248
 249         adev = bus_find_device(&acpi_bus_type, NULL,
 250                                to_pnp_dev(dev), acpi_pnp_match);
 251         if (!adev)
 252                 return -ENODEV;
 253
 254         acpi = to_acpi_device(adev);
 255         *handle = acpi->handle;
 256         put_device(adev);
 257         return 0;
 258 }
 259
 260 /* complete initialization of a PNPACPI device includes having
 261  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 262  */
 263 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 264         .bus         = &pnp_bus_type,
 265         .find_device = acpi_pnp_find_device,
 266 };
 267
 268 int pnpacpi_disabled __initdata;
 269 static int __init pnpacpi_init(void)
 270 {
 271         if (acpi_disabled || pnpacpi_disabled) {
 272                 pnp_info("PnP ACPI: disabled");
 273                 return 0;
 274         }
 275         pnp_info("PnP ACPI init");
 276         pnp_register_protocol(&pnpacpi_protocol);
 277         register_acpi_bus_type(&acpi_pnp_bus);
 278         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 279         pnp_info("PnP ACPI: found %d devices", num);
 280         unregister_acpi_bus_type(&acpi_pnp_bus);
 281         pnp_platform_devices = 1;
 282         return 0;
 283 }
 284
 285 subsys_initcall(pnpacpi_init);
 286
 287 static int __init pnpacpi_setup(char *str)
 288 {
 289         if (str == NULL)
 290                 return 1;
 291         if (!strncmp(str, "off", 3))
 292                 pnpacpi_disabled = 1;
 293         return 1;
 294 }
 295
 296 __setup("pnpacpi=", pnpacpi_setup);