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 <acpi/acpi_bus.h>
  25 #include "pnpacpi.h"
  26
  27 static int num = 0;
  28
  29 static char __initdata excluded_id_list[] =
  30         "PNP0C0A," /* Battery */
  31         "PNP0C0C,PNP0C0E,PNP0C0D," /* Button */
  32         "PNP0C09," /* EC */
  33         "PNP0C0B," /* Fan */
  34         "PNP0A03," /* PCI root */
  35         "PNP0C0F," /* Link device */
  36         "PNP0000," /* PIC */
  37         "PNP0100," /* Timer */
  38         ;
  39 static inline int is_exclusive_device(struct acpi_device *dev)
  40 {
  41         return (!acpi_match_ids(dev, excluded_id_list));
  42 }
  43
  44 /*
  45  * Compatible Device IDs
  46  */
  47 #define TEST_HEX(c) \
  48         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
  49                 return 0
  50 #define TEST_ALPHA(c) \
  51         if (!('@' <= (c) || (c) <= 'Z')) \
  52                 return 0
  53 static int __init ispnpidacpi(char *id)
  54 {
  55         TEST_ALPHA(id[0]);
  56         TEST_ALPHA(id[1]);
  57         TEST_ALPHA(id[2]);
  58         TEST_HEX(id[3]);
  59         TEST_HEX(id[4]);
  60         TEST_HEX(id[5]);
  61         TEST_HEX(id[6]);
  62         if (id[7] != '\0')
  63                 return 0;
  64         return 1;
  65 }
  66
  67 static void __init pnpidacpi_to_pnpid(char *id, char *str)
  68 {
  69         str[0] = id[0];
  70         str[1] = id[1];
  71         str[2] = id[2];
  72         str[3] = tolower(id[3]);
  73         str[4] = tolower(id[4]);
  74         str[5] = tolower(id[5]);
  75         str[6] = tolower(id[6]);
  76         str[7] = '\0';
  77 }
  78
  79 static int pnpacpi_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  80 {
  81         acpi_status status;
  82         status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
  83                 &dev->res);
  84         return ACPI_FAILURE(status) ? -ENODEV : 0;
  85 }
  86
  87 static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  88 {
  89         acpi_handle handle = dev->data;
  90         struct acpi_buffer buffer;
  91         int ret = 0;
  92         acpi_status status;
  93
  94         ret = pnpacpi_build_resource_template(handle, &buffer);
  95         if (ret)
  96                 return ret;
  97         ret = pnpacpi_encode_resources(res, &buffer);
  98         if (ret) {
  99                 kfree(buffer.pointer);
 100                 return ret;
 101         }
 102         status = acpi_set_current_resources(handle, &buffer);
 103         if (ACPI_FAILURE(status))
 104                 ret = -EINVAL;
 105         kfree(buffer.pointer);
 106         return ret;
 107 }
 108
 109 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 110 {
 111         acpi_status status;
 112
 113         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 114         status = acpi_evaluate_object((acpi_handle)dev->data,
 115                 "_DIS", NULL, NULL);
 116         return ACPI_FAILURE(status) ? -ENODEV : 0;
 117 }
 118
 119 struct pnp_protocol pnpacpi_protocol = {
 120         .name   = "Plug and Play ACPI",
 121         .get    = pnpacpi_get_resources,
 122         .set    = pnpacpi_set_resources,
 123         .disable = pnpacpi_disable_resources,
 124 };
 125
 126 static int __init pnpacpi_add_device(struct acpi_device *device)
 127 {
 128         acpi_handle temp = NULL;
 129         acpi_status status;
 130         struct pnp_id *dev_id;
 131         struct pnp_dev *dev;
 132
 133         if (!ispnpidacpi(acpi_device_hid(device)) ||
 134                 is_exclusive_device(device))
 135                 return 0;
 136
 137         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
 138         dev =  kcalloc(1, sizeof(struct pnp_dev), GFP_KERNEL);
 139         if (!dev) {
 140                 pnp_err("Out of memory");
 141                 return -ENOMEM;
 142         }
 143         dev->data = device->handle;
 144         /* .enabled means if the device can decode the resources */
 145         dev->active = device->status.enabled;
 146         status = acpi_get_handle(device->handle, "_SRS", &temp);
 147         if (ACPI_SUCCESS(status))
 148                 dev->capabilities |= PNP_CONFIGURABLE;
 149         dev->capabilities |= PNP_READ;
 150         if (device->flags.dynamic_status)
 151                 dev->capabilities |= PNP_WRITE;
 152         if (device->flags.removable)
 153                 dev->capabilities |= PNP_REMOVABLE;
 154         status = acpi_get_handle(device->handle, "_DIS", &temp);
 155         if (ACPI_SUCCESS(status))
 156                 dev->capabilities |= PNP_DISABLE;
 157
 158         dev->protocol = &pnpacpi_protocol;
 159
 160         if (strlen(acpi_device_name(device)))
 161                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 162         else
 163                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 164
 165         dev->number = num;
 166
 167         /* set the initial values for the PnP device */
 168         dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
 169         if (!dev_id)
 170                 goto err;
 171         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 172         pnp_add_id(dev_id, dev);
 173
 174         if(dev->active) {
 175                 /* parse allocated resource */
 176                 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
 177                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 178                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
 179                         goto err1;
 180                 }
 181         }
 182
 183         if(dev->capabilities & PNP_CONFIGURABLE) {
 184                 status = pnpacpi_parse_resource_option_data(device->handle,
 185                         dev);
 186                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 187                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
 188                         goto err1;
 189                 }
 190         }
 191
 192         /* parse compatible ids */
 193         if (device->flags.compatible_ids) {
 194                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 195                 int i;
 196
 197                 for (i = 0; i < cid_list->count; i++) {
 198                         if (!ispnpidacpi(cid_list->id[i].value))
 199                                 continue;
 200                         dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
 201                         if (!dev_id)
 202                                 continue;
 203
 204                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 205                         pnp_add_id(dev_id, dev);
 206                 }
 207         }
 208
 209         /* clear out the damaged flags */
 210         if (!dev->active)
 211                 pnp_init_resource_table(&dev->res);
 212         pnp_add_device(dev);
 213         num ++;
 214
 215         return AE_OK;
 216 err1:
 217         kfree(dev_id);
 218 err:
 219         kfree(dev);
 220         return -EINVAL;
 221 }
 222
 223 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 224         u32 lvl, void *context, void **rv)
 225 {
 226         struct acpi_device *device;
 227
 228         if (!acpi_bus_get_device(handle, &device))
 229                 pnpacpi_add_device(device);
 230         else
 231                 return AE_CTRL_DEPTH;
 232         return AE_OK;
 233 }
 234
 235 int pnpacpi_disabled __initdata;
 236 int __init pnpacpi_init(void)
 237 {
 238         if (acpi_disabled || pnpacpi_disabled) {
 239                 pnp_info("PnP ACPI: disabled");
 240                 return 0;
 241         }
 242         pnp_info("PnP ACPI init");
 243         pnp_register_protocol(&pnpacpi_protocol);
 244         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 245         pnp_info("PnP ACPI: found %d devices", num);
 246         return 0;
 247 }
 248 subsys_initcall(pnpacpi_init);
 249
 250 static int __init pnpacpi_setup(char *str)
 251 {
 252         if (str == NULL)
 253                 return 1;
 254         if (!strncmp(str, "off", 3))
 255                 pnpacpi_disabled = 1;
 256         return 1;
 257 }
 258 __setup("pnpacpi=", pnpacpi_setup);
 259
 260 EXPORT_SYMBOL(pnpacpi_protocol);