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 #include <acpi/actypes.h> 27 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 __initdata acpi_device_id excluded_id_list[] = { 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 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 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, 88 struct pnp_resource_table *res) 89 { 90 acpi_status status; 91 92 status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data, 93 &dev->res); 94 return ACPI_FAILURE(status) ? -ENODEV : 0; 95 } 96 97 static int pnpacpi_set_resources(struct pnp_dev *dev, 98 struct pnp_resource_table *res) 99 { 100 acpi_handle handle = dev->data; 101 struct acpi_buffer buffer; 102 int ret = 0; 103 acpi_status status; 104 105 ret = pnpacpi_build_resource_template(handle, &buffer); 106 if (ret) 107 return ret; 108 ret = pnpacpi_encode_resources(res, &buffer); 109 if (ret) { 110 kfree(buffer.pointer); 111 return ret; 112 } 113 status = acpi_set_current_resources(handle, &buffer); 114 if (ACPI_FAILURE(status)) 115 ret = -EINVAL; 116 kfree(buffer.pointer); 117 return ret; 118 } 119 120 static int pnpacpi_disable_resources(struct pnp_dev *dev) 121 { 122 acpi_status status; 123 124 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */ 125 status = acpi_evaluate_object((acpi_handle) dev->data, 126 "_DIS", NULL, NULL); 127 return ACPI_FAILURE(status) ? -ENODEV : 0; 128 } 129 130 #ifdef CONFIG_ACPI_SLEEP 131 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state) 132 { 133 return acpi_bus_set_power((acpi_handle) dev->data, 134 acpi_pm_device_sleep_state(&dev->dev, 135 device_may_wakeup 136 (&dev->dev), 137 NULL)); 138 } 139 140 static int pnpacpi_resume(struct pnp_dev *dev) 141 { 142 return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0); 143 } 144 #endif 145 146 static struct pnp_protocol pnpacpi_protocol = { 147 .name = "Plug and Play ACPI", 148 .get = pnpacpi_get_resources, 149 .set = pnpacpi_set_resources, 150 .disable = pnpacpi_disable_resources, 151 #ifdef CONFIG_ACPI_SLEEP 152 .suspend = pnpacpi_suspend, 153 .resume = pnpacpi_resume, 154 #endif 155 }; 156 157 static int __init pnpacpi_add_device(struct acpi_device *device) 158 { 159 acpi_handle temp = NULL; 160 acpi_status status; 161 struct pnp_id *dev_id; 162 struct pnp_dev *dev; 163 164 status = acpi_get_handle(device->handle, "_CRS", &temp); 165 if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) || 166 is_exclusive_device(device)) 167 return 0; 168 169 pnp_dbg("ACPI device : hid %s", acpi_device_hid(device)); 170 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL); 171 if (!dev) { 172 pnp_err("Out of memory"); 173 return -ENOMEM; 174 } 175 dev->data = device->handle; 176 /* .enabled means the device can decode the resources */ 177 dev->active = device->status.enabled; 178 status = acpi_get_handle(device->handle, "_SRS", &temp); 179 if (ACPI_SUCCESS(status)) 180 dev->capabilities |= PNP_CONFIGURABLE; 181 dev->capabilities |= PNP_READ; 182 if (device->flags.dynamic_status) 183 dev->capabilities |= PNP_WRITE; 184 if (device->flags.removable) 185 dev->capabilities |= PNP_REMOVABLE; 186 status = acpi_get_handle(device->handle, "_DIS", &temp); 187 if (ACPI_SUCCESS(status)) 188 dev->capabilities |= PNP_DISABLE; 189 190 dev->protocol = &pnpacpi_protocol; 191 192 if (strlen(acpi_device_name(device))) 193 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name)); 194 else 195 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name)); 196 197 dev->number = num; 198 199 /* set the initial values for the PnP device */ 200 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); 201 if (!dev_id) 202 goto err; 203 pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id); 204 pnp_add_id(dev_id, dev); 205 206 if (dev->active) { 207 /* parse allocated resource */ 208 status = pnpacpi_parse_allocated_resource(device->handle, 209 &dev->res); 210 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 211 pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", 212 dev_id->id); 213 goto err1; 214 } 215 } 216 217 if (dev->capabilities & PNP_CONFIGURABLE) { 218 status = pnpacpi_parse_resource_option_data(device->handle, 219 dev); 220 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 221 pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", 222 dev_id->id); 223 goto err1; 224 } 225 } 226 227 /* parse compatible ids */ 228 if (device->flags.compatible_ids) { 229 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 230 int i; 231 232 for (i = 0; i < cid_list->count; i++) { 233 if (!ispnpidacpi(cid_list->id[i].value)) 234 continue; 235 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); 236 if (!dev_id) 237 continue; 238 239 pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id); 240 pnp_add_id(dev_id, dev); 241 } 242 } 243 244 /* clear out the damaged flags */ 245 if (!dev->active) 246 pnp_init_resource_table(&dev->res); 247 pnp_add_device(dev); 248 num++; 249 250 return AE_OK; 251 err1: 252 kfree(dev_id); 253 err: 254 kfree(dev); 255 return -EINVAL; 256 } 257 258 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle, 259 u32 lvl, void *context, 260 void **rv) 261 { 262 struct acpi_device *device; 263 264 if (!acpi_bus_get_device(handle, &device)) 265 pnpacpi_add_device(device); 266 else 267 return AE_CTRL_DEPTH; 268 return AE_OK; 269 } 270 271 static int __init acpi_pnp_match(struct device *dev, void *_pnp) 272 { 273 struct acpi_device *acpi = to_acpi_device(dev); 274 struct pnp_dev *pnp = _pnp; 275 276 /* true means it matched */ 277 return acpi->flags.hardware_id 278 && !acpi_get_physical_device(acpi->handle) 279 && compare_pnp_id(pnp->id, acpi->pnp.hardware_id); 280 } 281 282 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle) 283 { 284 struct device *adev; 285 struct acpi_device *acpi; 286 287 adev = bus_find_device(&acpi_bus_type, NULL, 288 to_pnp_dev(dev), acpi_pnp_match); 289 if (!adev) 290 return -ENODEV; 291 292 acpi = to_acpi_device(adev); 293 *handle = acpi->handle; 294 put_device(adev); 295 return 0; 296 } 297 298 /* complete initialization of a PNPACPI device includes having 299 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling. 300 */ 301 static struct acpi_bus_type __initdata acpi_pnp_bus = { 302 .bus = &pnp_bus_type, 303 .find_device = acpi_pnp_find_device, 304 }; 305 306 int pnpacpi_disabled __initdata; 307 static int __init pnpacpi_init(void) 308 { 309 if (acpi_disabled || pnpacpi_disabled) { 310 pnp_info("PnP ACPI: disabled"); 311 return 0; 312 } 313 pnp_info("PnP ACPI init"); 314 pnp_register_protocol(&pnpacpi_protocol); 315 register_acpi_bus_type(&acpi_pnp_bus); 316 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL); 317 pnp_info("PnP ACPI: found %d devices", num); 318 unregister_acpi_bus_type(&acpi_pnp_bus); 319 pnp_platform_devices = 1; 320 return 0; 321 } 322 323 subsys_initcall(pnpacpi_init); 324 325 static int __init pnpacpi_setup(char *str) 326 { 327 if (str == NULL) 328 return 1; 329 if (!strncmp(str, "off", 3)) 330 pnpacpi_disabled = 1; 331 return 1; 332 } 333 334 __setup("pnpacpi=", pnpacpi_setup); 335