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/config.h>
  23 #include <linux/acpi.h>
  24 #include <linux/pnp.h>
  25 #include <acpi/acpi_bus.h>
  26 #include "pnpacpi.h"
  27
  28 static int num = 0;
  29
  30 /* We need only to blacklist devices that have already an acpi driver that
  31  * can't use pnp layer. We don't need to blacklist device that are directly
  32  * used by the kernel (PCI root, ...), as it is harmless and there were
  33  * already present in pnpbios. But there is an exception for devices that
  34  * have irqs (PIC, Timer) because we call acpi_register_gsi.
  35  * Finaly only devices that have a CRS method need to be in this list.
  36  */
  37 static char __initdata excluded_id_list[] =
  38         "PNP0C09," /* EC */
  39         "PNP0C0F," /* Link device */
  40         "PNP0000," /* PIC */
  41         "PNP0100," /* Timer */
  42         ;
  43 static inline int is_exclusive_device(struct acpi_device *dev)
  44 {
  45         return (!acpi_match_ids(dev, excluded_id_list));
  46 }
  47
  48 /*
  49  * Compatible Device IDs
  50  */
  51 #define TEST_HEX(c) \
  52         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  53                 return 0
  54 #define TEST_ALPHA(c) \
  55         if (!('@' <= (c) || (c) <= 'Z')) \
  56                 return 0
  57 static int __init ispnpidacpi(char *id)
  58 {
  59         TEST_ALPHA(id[0]);
  60         TEST_ALPHA(id[1]);
  61         TEST_ALPHA(id[2]);
  62         TEST_HEX(id[3]);
  63         TEST_HEX(id[4]);
  64         TEST_HEX(id[5]);
  65         TEST_HEX(id[6]);
  66         if (id[7] != '\0')
  67                 return 0;
  68         return 1;
  69 }
  70
  71 static void __init pnpidacpi_to_pnpid(char *id, char *str)
  72 {
  73         str[0] = id[0];
  74         str[1] = id[1];
  75         str[2] = id[2];
  76         str[3] = tolower(id[3]);
  77         str[4] = tolower(id[4]);
  78         str[5] = tolower(id[5]);
  79         str[6] = tolower(id[6]);
  80         str[7] = '\0';
  81 }
  82
  83 static int pnpacpi_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  84 {
  85         acpi_status status;
  86         status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
  87                 &dev->res);
  88         return ACPI_FAILURE(status) ? -ENODEV : 0;
  89 }
  90
  91 static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  92 {
  93         acpi_handle handle = dev->data;
  94         struct acpi_buffer buffer;
  95         int ret = 0;
  96         acpi_status status;
  97
  98         ret = pnpacpi_build_resource_template(handle, &buffer);
  99         if (ret)
 100                 return ret;
 101         ret = pnpacpi_encode_resources(res, &buffer);
 102         if (ret) {
 103                 kfree(buffer.pointer);
 104                 return ret;
 105         }
 106         status = acpi_set_current_resources(handle, &buffer);
 107         if (ACPI_FAILURE(status))
 108                 ret = -EINVAL;
 109         kfree(buffer.pointer);
 110         return ret;
 111 }
 112
 113 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 114 {
 115         acpi_status status;
 116
 117         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 118         status = acpi_evaluate_object((acpi_handle)dev->data,
 119                 "_DIS", NULL, NULL);
 120         return ACPI_FAILURE(status) ? -ENODEV : 0;
 121 }
 122
 123 static struct pnp_protocol pnpacpi_protocol = {
 124         .name   = "Plug and Play ACPI",
 125         .get    = pnpacpi_get_resources,
 126         .set    = pnpacpi_set_resources,
 127         .disable = pnpacpi_disable_resources,
 128 };
 129
 130 static int __init pnpacpi_add_device(struct acpi_device *device)
 131 {
 132         acpi_handle temp = NULL;
 133         acpi_status status;
 134         struct pnp_id *dev_id;
 135         struct pnp_dev *dev;
 136
 137         status = acpi_get_handle(device->handle, "_CRS", &temp);
 138         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
 139                 is_exclusive_device(device))
 140                 return 0;
 141
 142         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
 143         dev =  kcalloc(1, sizeof(struct pnp_dev), GFP_KERNEL);
 144         if (!dev) {
 145                 pnp_err("Out of memory");
 146                 return -ENOMEM;
 147         }
 148         dev->data = device->handle;
 149         /* .enabled means if the device can decode the resources */
 150         dev->active = device->status.enabled;
 151         status = acpi_get_handle(device->handle, "_SRS", &temp);
 152         if (ACPI_SUCCESS(status))
 153                 dev->capabilities |= PNP_CONFIGURABLE;
 154         dev->capabilities |= PNP_READ;
 155         if (device->flags.dynamic_status)
 156                 dev->capabilities |= PNP_WRITE;
 157         if (device->flags.removable)
 158                 dev->capabilities |= PNP_REMOVABLE;
 159         status = acpi_get_handle(device->handle, "_DIS", &temp);
 160         if (ACPI_SUCCESS(status))
 161                 dev->capabilities |= PNP_DISABLE;
 162
 163         dev->protocol = &pnpacpi_protocol;
 164
 165         if (strlen(acpi_device_name(device)))
 166                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 167         else
 168                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 169
 170         dev->number = num;
 171
 172         /* set the initial values for the PnP device */
 173         dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
 174         if (!dev_id)
 175                 goto err;
 176         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 177         pnp_add_id(dev_id, dev);
 178
 179         if(dev->active) {
 180                 /* parse allocated resource */
 181                 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
 182                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 183                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
 184                         goto err1;
 185                 }
 186         }
 187
 188         if(dev->capabilities & PNP_CONFIGURABLE) {
 189                 status = pnpacpi_parse_resource_option_data(device->handle,
 190                         dev);
 191                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 192                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
 193                         goto err1;
 194                 }
 195         }
 196
 197         /* parse compatible ids */
 198         if (device->flags.compatible_ids) {
 199                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 200                 int i;
 201
 202                 for (i = 0; i < cid_list->count; i++) {
 203                         if (!ispnpidacpi(cid_list->id[i].value))
 204                                 continue;
 205                         dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
 206                         if (!dev_id)
 207                                 continue;
 208
 209                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 210                         pnp_add_id(dev_id, dev);
 211                 }
 212         }
 213
 214         /* clear out the damaged flags */
 215         if (!dev->active)
 216                 pnp_init_resource_table(&dev->res);
 217         pnp_add_device(dev);
 218         num ++;
 219
 220         return AE_OK;
 221 err1:
 222         kfree(dev_id);
 223 err:
 224         kfree(dev);
 225         return -EINVAL;
 226 }
 227
 228 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 229         u32 lvl, void *context, void **rv)
 230 {
 231         struct acpi_device *device;
 232
 233         if (!acpi_bus_get_device(handle, &device))
 234                 pnpacpi_add_device(device);
 235         else
 236                 return AE_CTRL_DEPTH;
 237         return AE_OK;
 238 }
 239
 240 int pnpacpi_disabled __initdata;
 241 static int __init pnpacpi_init(void)
 242 {
 243         if (acpi_disabled || pnpacpi_disabled) {
 244                 pnp_info("PnP ACPI: disabled");
 245                 return 0;
 246         }
 247         pnp_info("PnP ACPI init");
 248         pnp_register_protocol(&pnpacpi_protocol);
 249         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 250         pnp_info("PnP ACPI: found %d devices", num);
 251         return 0;
 252 }
 253 subsys_initcall(pnpacpi_init);
 254
 255 static int __init pnpacpi_setup(char *str)
 256 {
 257         if (str == NULL)
 258                 return 1;
 259         if (!strncmp(str, "off", 3))
 260                 pnpacpi_disabled = 1;
 261         return 1;
 262 }
 263 __setup("pnpacpi=", pnpacpi_setup);
 264
 265 #if 0
 266 EXPORT_SYMBOL(pnpacpi_protocol);
 267 #endif