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         acpi_status status;
  87
  88         pnp_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         status = acpi_set_current_resources(handle, &buffer);
  98         if (ACPI_FAILURE(status))
  99                 ret = -EINVAL;
 100         kfree(buffer.pointer);
 101         return ret;
 102 }
 103
 104 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 105 {
 106         acpi_status status;
 107
 108         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 109         status = acpi_evaluate_object((acpi_handle) dev->data,
 110                                       "_DIS", NULL, NULL);
 111         return ACPI_FAILURE(status) ? -ENODEV : 0;
 112 }
 113
 114 #ifdef CONFIG_ACPI_SLEEP
 115 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
 116 {
 117         int power_state;
 118
 119         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 120         if (power_state < 0)
 121                 power_state = (state.event == PM_EVENT_ON) ?
 122                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 123
 124         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
 125 }
 126
 127 static int pnpacpi_resume(struct pnp_dev *dev)
 128 {
 129         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
 130 }
 131 #endif
 132
 133 static struct pnp_protocol pnpacpi_protocol = {
 134         .name    = "Plug and Play ACPI",
 135         .get     = pnpacpi_get_resources,
 136         .set     = pnpacpi_set_resources,
 137         .disable = pnpacpi_disable_resources,
 138 #ifdef CONFIG_ACPI_SLEEP
 139         .suspend = pnpacpi_suspend,
 140         .resume = pnpacpi_resume,
 141 #endif
 142 };
 143
 144 static int __init pnpacpi_add_device(struct acpi_device *device)
 145 {
 146         acpi_handle temp = NULL;
 147         acpi_status status;
 148         struct pnp_dev *dev;
 149
 150         /*
 151          * If a PnPacpi device is not present , the device
 152          * driver should not be loaded.
 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) || (!device->status.present))
 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                 pnpacpi_parse_allocated_resource(dev);
 185
 186         if (dev->capabilities & PNP_CONFIGURABLE)
 187                 pnpacpi_parse_resource_option_data(dev);
 188
 189         if (device->flags.compatible_ids) {
 190                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 191                 int i;
 192
 193                 for (i = 0; i < cid_list->count; i++) {
 194                         if (!ispnpidacpi(cid_list->id[i].value))
 195                                 continue;
 196                         pnp_add_id(dev, cid_list->id[i].value);
 197                 }
 198         }
 199
 200         /* clear out the damaged flags */
 201         if (!dev->active)
 202                 pnp_init_resources(dev);
 203         pnp_add_device(dev);
 204         num++;
 205
 206         return AE_OK;
 207 }
 208
 209 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 210                                                      u32 lvl, void *context,
 211                                                      void **rv)
 212 {
 213         struct acpi_device *device;
 214
 215         if (!acpi_bus_get_device(handle, &device))
 216                 pnpacpi_add_device(device);
 217         else
 218                 return AE_CTRL_DEPTH;
 219         return AE_OK;
 220 }
 221
 222 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 223 {
 224         struct acpi_device *acpi = to_acpi_device(dev);
 225         struct pnp_dev *pnp = _pnp;
 226
 227         /* true means it matched */
 228         return acpi->flags.hardware_id
 229             && !acpi_get_physical_device(acpi->handle)
 230             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
 231 }
 232
 233 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 234 {
 235         struct device *adev;
 236         struct acpi_device *acpi;
 237
 238         adev = bus_find_device(&acpi_bus_type, NULL,
 239                                to_pnp_dev(dev), acpi_pnp_match);
 240         if (!adev)
 241                 return -ENODEV;
 242
 243         acpi = to_acpi_device(adev);
 244         *handle = acpi->handle;
 245         put_device(adev);
 246         return 0;
 247 }
 248
 249 /* complete initialization of a PNPACPI device includes having
 250  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 251  */
 252 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 253         .bus         = &pnp_bus_type,
 254         .find_device = acpi_pnp_find_device,
 255 };
 256
 257 int pnpacpi_disabled __initdata;
 258 static int __init pnpacpi_init(void)
 259 {
 260         if (acpi_disabled || pnpacpi_disabled) {
 261                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 262                 return 0;
 263         }
 264         printk(KERN_INFO "pnp: PnP ACPI init\n");
 265         pnp_register_protocol(&pnpacpi_protocol);
 266         register_acpi_bus_type(&acpi_pnp_bus);
 267         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 268         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 269         unregister_acpi_bus_type(&acpi_pnp_bus);
 270         pnp_platform_devices = 1;
 271         return 0;
 272 }
 273
 274 fs_initcall(pnpacpi_init);
 275
 276 static int __init pnpacpi_setup(char *str)
 277 {
 278         if (str == NULL)
 279                 return 1;
 280         if (!strncmp(str, "off", 3))
 281                 pnpacpi_disabled = 1;
 282         return 1;
 283 }
 284
 285 __setup("pnpacpi=", pnpacpi_setup);