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/slab.h>
  25 #include <linux/mod_devicetable.h>
  26 #include <acpi/acpi_bus.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         pnp_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         struct acpi_device *acpi_dev = dev->data;
  85         acpi_handle handle = acpi_dev->handle;
  86         struct acpi_buffer buffer;
  87         int ret;
  88
  89         pnp_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         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
  99                 ret = -EINVAL;
 100         else if (acpi_bus_power_manageable(handle))
 101                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
 102         kfree(buffer.pointer);
 103         return ret;
 104 }
 105
 106 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 107 {
 108         struct acpi_device *acpi_dev = dev->data;
 109         acpi_handle handle = acpi_dev->handle;
 110         int ret;
 111
 112         dev_dbg(&dev->dev, "disable resources\n");
 113
 114         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 115         ret = 0;
 116         if (acpi_bus_power_manageable(handle))
 117                 acpi_bus_set_power(handle, ACPI_STATE_D3);
 118                 /* continue even if acpi_bus_set_power() fails */
 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         struct acpi_device *acpi_dev = dev->data;
 128         acpi_handle handle = acpi_dev->handle;
 129         int power_state;
 130
 131         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
 132         if (power_state < 0)
 133                 power_state = (state.event == PM_EVENT_ON) ?
 134                                 ACPI_STATE_D0 : ACPI_STATE_D3;
 135
 136         return acpi_bus_set_power(handle, power_state);
 137 }
 138
 139 static int pnpacpi_resume(struct pnp_dev *dev)
 140 {
 141         struct acpi_device *acpi_dev = dev->data;
 142         acpi_handle handle = acpi_dev->handle;
 143
 144         return acpi_bus_set_power(handle, ACPI_STATE_D0);
 145 }
 146 #endif
 147
 148 struct pnp_protocol pnpacpi_protocol = {
 149         .name    = "Plug and Play ACPI",
 150         .get     = pnpacpi_get_resources,
 151         .set     = pnpacpi_set_resources,
 152         .disable = pnpacpi_disable_resources,
 153 #ifdef CONFIG_ACPI_SLEEP
 154         .suspend = pnpacpi_suspend,
 155         .resume = pnpacpi_resume,
 156 #endif
 157 };
 158 EXPORT_SYMBOL(pnpacpi_protocol);
 159
 160 static int __init pnpacpi_add_device(struct acpi_device *device)
 161 {
 162         acpi_handle temp = NULL;
 163         acpi_status status;
 164         struct pnp_dev *dev;
 165         struct acpi_hardware_id *id;
 166
 167         /*
 168          * If a PnPacpi device is not present , the device
 169          * driver should not be loaded.
 170          */
 171         status = acpi_get_handle(device->handle, "_CRS", &temp);
 172         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 173             is_exclusive_device(device) || (!device->status.present))
 174                 return 0;
 175
 176         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
 177         if (!dev)
 178                 return -ENOMEM;
 179
 180         dev->data = device;
 181         /* .enabled means the device can decode the resources */
 182         dev->active = device->status.enabled;
 183         status = acpi_get_handle(device->handle, "_SRS", &temp);
 184         if (ACPI_SUCCESS(status))
 185                 dev->capabilities |= PNP_CONFIGURABLE;
 186         dev->capabilities |= PNP_READ;
 187         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
 188                 dev->capabilities |= PNP_WRITE;
 189         if (device->flags.removable)
 190                 dev->capabilities |= PNP_REMOVABLE;
 191         status = acpi_get_handle(device->handle, "_DIS", &temp);
 192         if (ACPI_SUCCESS(status))
 193                 dev->capabilities |= PNP_DISABLE;
 194
 195         if (strlen(acpi_device_name(device)))
 196                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 197         else
 198                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 199
 200         if (dev->active)
 201                 pnpacpi_parse_allocated_resource(dev);
 202
 203         if (dev->capabilities & PNP_CONFIGURABLE)
 204                 pnpacpi_parse_resource_option_data(dev);
 205
 206         list_for_each_entry(id, &device->pnp.ids, list) {
 207                 if (!strcmp(id->id, acpi_device_hid(device)))
 208                         continue;
 209                 if (!ispnpidacpi(id->id))
 210                         continue;
 211                 pnp_add_id(dev, id->id);
 212         }
 213
 214         /* clear out the damaged flags */
 215         if (!dev->active)
 216                 pnp_init_resources(dev);
 217         pnp_add_device(dev);
 218         num++;
 219
 220         return AE_OK;
 221 }
 222
 223 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 224                                                      u32 lvl, void *context,
 225                                                      void **rv)
 226 {
 227         struct acpi_device *device;
 228
 229         if (!acpi_bus_get_device(handle, &device))
 230                 pnpacpi_add_device(device);
 231         else
 232                 return AE_CTRL_DEPTH;
 233         return AE_OK;
 234 }
 235
 236 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
 237 {
 238         struct acpi_device *acpi = to_acpi_device(dev);
 239         struct pnp_dev *pnp = _pnp;
 240
 241         /* true means it matched */
 242         return !acpi_get_physical_device(acpi->handle)
 243             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
 244 }
 245
 246 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
 247 {
 248         struct device *adev;
 249         struct acpi_device *acpi;
 250
 251         adev = bus_find_device(&acpi_bus_type, NULL,
 252                                to_pnp_dev(dev), acpi_pnp_match);
 253         if (!adev)
 254                 return -ENODEV;
 255
 256         acpi = to_acpi_device(adev);
 257         *handle = acpi->handle;
 258         put_device(adev);
 259         return 0;
 260 }
 261
 262 /* complete initialization of a PNPACPI device includes having
 263  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 264  */
 265 static struct acpi_bus_type __initdata acpi_pnp_bus = {
 266         .bus         = &pnp_bus_type,
 267         .find_device = acpi_pnp_find_device,
 268 };
 269
 270 int pnpacpi_disabled __initdata;
 271 static int __init pnpacpi_init(void)
 272 {
 273         if (acpi_disabled || pnpacpi_disabled) {
 274                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
 275                 return 0;
 276         }
 277         printk(KERN_INFO "pnp: PnP ACPI init\n");
 278         pnp_register_protocol(&pnpacpi_protocol);
 279         register_acpi_bus_type(&acpi_pnp_bus);
 280         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 281         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
 282         unregister_acpi_bus_type(&acpi_pnp_bus);
 283         pnp_platform_devices = 1;
 284         return 0;
 285 }
 286
 287 fs_initcall(pnpacpi_init);
 288
 289 static int __init pnpacpi_setup(char *str)
 290 {
 291         if (str == NULL)
 292                 return 1;
 293         if (!strncmp(str, "off", 3))
 294                 pnpacpi_disabled = 1;
 295         return 1;
 296 }
 297
 298 __setup("pnpacpi=", pnpacpi_setup);