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 void *pnpacpi_kmalloc(size_t size, int f)
  45 {
  46         void *p = kmalloc(size, f);
  47         if (p)
  48                 memset(p, 0, size);
  49         return p;
  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 void __init pnpidacpi_to_pnpid(char *id, char *str)
  76 {
  77         str[0] = id[0];
  78         str[1] = id[1];
  79         str[2] = id[2];
  80         str[3] = tolower(id[3]);
  81         str[4] = tolower(id[4]);
  82         str[5] = tolower(id[5]);
  83         str[6] = tolower(id[6]);
  84         str[7] = '\0';
  85 }
  86
  87 static int pnpacpi_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  88 {
  89         acpi_status status;
  90         status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
  91                 &dev->res);
  92         return ACPI_FAILURE(status) ? -ENODEV : 0;
  93 }
  94
  95 static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
  96 {
  97         acpi_handle handle = dev->data;
  98         struct acpi_buffer buffer;
  99         int ret = 0;
 100         acpi_status status;
 101
 102         ret = pnpacpi_build_resource_template(handle, &buffer);
 103         if (ret)
 104                 return ret;
 105         ret = pnpacpi_encode_resources(res, &buffer);
 106         if (ret) {
 107                 kfree(buffer.pointer);
 108                 return ret;
 109         }
 110         status = acpi_set_current_resources(handle, &buffer);
 111         if (ACPI_FAILURE(status))
 112                 ret = -EINVAL;
 113         kfree(buffer.pointer);
 114         return ret;
 115 }
 116
 117 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 118 {
 119         acpi_status status;
 120
 121         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 122         status = acpi_evaluate_object((acpi_handle)dev->data,
 123                 "_DIS", NULL, NULL);
 124         return ACPI_FAILURE(status) ? -ENODEV : 0;
 125 }
 126
 127 struct pnp_protocol pnpacpi_protocol = {
 128         .name   = "Plug and Play ACPI",
 129         .get    = pnpacpi_get_resources,
 130         .set    = pnpacpi_set_resources,
 131         .disable = pnpacpi_disable_resources,
 132 };
 133
 134 static int __init pnpacpi_add_device(struct acpi_device *device)
 135 {
 136         acpi_handle temp = NULL;
 137         acpi_status status;
 138         struct pnp_id *dev_id;
 139         struct pnp_dev *dev;
 140
 141         if (!ispnpidacpi(acpi_device_hid(device)) ||
 142                 is_exclusive_device(device))
 143                 return 0;
 144
 145         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
 146         dev =  pnpacpi_kmalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 147         if (!dev) {
 148                 pnp_err("Out of memory");
 149                 return -ENOMEM;
 150         }
 151         dev->data = device->handle;
 152         /* .enabled means if the device can decode the resources */
 153         dev->active = device->status.enabled;
 154         status = acpi_get_handle(device->handle, "_SRS", &temp);
 155         if (ACPI_SUCCESS(status))
 156                 dev->capabilities |= PNP_CONFIGURABLE;
 157         dev->capabilities |= PNP_READ;
 158         if (device->flags.dynamic_status)
 159                 dev->capabilities |= PNP_WRITE;
 160         if (device->flags.removable)
 161                 dev->capabilities |= PNP_REMOVABLE;
 162         status = acpi_get_handle(device->handle, "_DIS", &temp);
 163         if (ACPI_SUCCESS(status))
 164                 dev->capabilities |= PNP_DISABLE;
 165
 166         dev->protocol = &pnpacpi_protocol;
 167
 168         if (strlen(acpi_device_name(device)))
 169                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
 170         else
 171                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 172
 173         dev->number = num;
 174
 175         /* set the initial values for the PnP device */
 176         dev_id = pnpacpi_kmalloc(sizeof(struct pnp_id), GFP_KERNEL);
 177         if (!dev_id)
 178                 goto err;
 179         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
 180         pnp_add_id(dev_id, dev);
 181
 182         if(dev->active) {
 183                 /* parse allocated resource */
 184                 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
 185                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 186                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
 187                         goto err1;
 188                 }
 189         }
 190
 191         if(dev->capabilities & PNP_CONFIGURABLE) {
 192                 status = pnpacpi_parse_resource_option_data(device->handle,
 193                         dev);
 194                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 195                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
 196                         goto err1;
 197                 }
 198         }
 199
 200         /* parse compatible ids */
 201         if (device->flags.compatible_ids) {
 202                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 203                 int i;
 204
 205                 for (i = 0; i < cid_list->count; i++) {
 206                         if (!ispnpidacpi(cid_list->id[i].value))
 207                                 continue;
 208                         dev_id = pnpacpi_kmalloc(sizeof(struct pnp_id),
 209                                 GFP_KERNEL);
 210                         if (!dev_id)
 211                                 continue;
 212
 213                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
 214                         pnp_add_id(dev_id, dev);
 215                 }
 216         }
 217
 218         /* clear out the damaged flags */
 219         if (!dev->active)
 220                 pnp_init_resource_table(&dev->res);
 221         pnp_add_device(dev);
 222         num ++;
 223
 224         return AE_OK;
 225 err1:
 226         kfree(dev_id);
 227 err:
 228         kfree(dev);
 229         return -EINVAL;
 230 }
 231
 232 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
 233         u32 lvl, void *context, void **rv)
 234 {
 235         struct acpi_device *device;
 236
 237         if (!acpi_bus_get_device(handle, &device))
 238                 pnpacpi_add_device(device);
 239         else
 240                 return AE_CTRL_DEPTH;
 241         return AE_OK;
 242 }
 243
 244 int pnpacpi_disabled __initdata;
 245 int __init pnpacpi_init(void)
 246 {
 247         if (acpi_disabled || pnpacpi_disabled) {
 248                 pnp_info("PnP ACPI: disabled");
 249                 return 0;
 250         }
 251         pnp_info("PnP ACPI init");
 252         pnp_register_protocol(&pnpacpi_protocol);
 253         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
 254         pnp_info("PnP ACPI: found %d devices", num);
 255         return 0;
 256 }
 257 subsys_initcall(pnpacpi_init);
 258
 259 static int __init pnpacpi_setup(char *str)
 260 {
 261         if (str == NULL)
 262                 return 1;
 263         if (!strncmp(str, "off", 3))
 264                 pnpacpi_disabled = 1;
 265         return 1;
 266 }
 267 __setup("pnpacpi=", pnpacpi_setup);
 268
 269 EXPORT_SYMBOL(pnpacpi_protocol);