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); 299