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 27 #include "../base.h" 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 acpi_device_id excluded_id_list[] __initdata = { 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 __init 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 int pnpacpi_get_resources(struct pnp_dev *dev) 76 { 77 pnp_dbg(&dev->dev, "get resources\n"); 78 return pnpacpi_parse_allocated_resource(dev); 79 } 80 81 static int pnpacpi_set_resources(struct pnp_dev *dev) 82 { 83 acpi_handle handle = dev->data; 84 struct acpi_buffer buffer; 85 int ret; 86 acpi_status status; 87 88 pnp_dbg(&dev->dev, "set resources\n"); 89 ret = pnpacpi_build_resource_template(dev, &buffer); 90 if (ret) 91 return ret; 92 ret = pnpacpi_encode_resources(dev, &buffer); 93 if (ret) { 94 kfree(buffer.pointer); 95 return ret; 96 } 97 status = acpi_set_current_resources(handle, &buffer); 98 if (ACPI_FAILURE(status)) 99 ret = -EINVAL; 100 kfree(buffer.pointer); 101 return ret; 102 } 103 104 static int pnpacpi_disable_resources(struct pnp_dev *dev) 105 { 106 acpi_status status; 107 108 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */ 109 status = acpi_evaluate_object((acpi_handle) dev->data, 110 "_DIS", NULL, NULL); 111 return ACPI_FAILURE(status) ? -ENODEV : 0; 112 } 113 114 #ifdef CONFIG_ACPI_SLEEP 115 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state) 116 { 117 int power_state; 118 119 power_state = acpi_pm_device_sleep_state(&dev->dev, NULL); 120 if (power_state < 0) 121 power_state = (state.event == PM_EVENT_ON) ? 122 ACPI_STATE_D0 : ACPI_STATE_D3; 123 124 return acpi_bus_set_power((acpi_handle) dev->data, power_state); 125 } 126 127 static int pnpacpi_resume(struct pnp_dev *dev) 128 { 129 return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0); 130 } 131 #endif 132 133 static struct pnp_protocol pnpacpi_protocol = { 134 .name = "Plug and Play ACPI", 135 .get = pnpacpi_get_resources, 136 .set = pnpacpi_set_resources, 137 .disable = pnpacpi_disable_resources, 138 #ifdef CONFIG_ACPI_SLEEP 139 .suspend = pnpacpi_suspend, 140 .resume = pnpacpi_resume, 141 #endif 142 }; 143 144 static int __init pnpacpi_add_device(struct acpi_device *device) 145 { 146 acpi_handle temp = NULL; 147 acpi_status status; 148 struct pnp_dev *dev; 149 150 /* 151 * If a PnPacpi device is not present , the device 152 * driver should not be loaded. 153 */ 154 status = acpi_get_handle(device->handle, "_CRS", &temp); 155 if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) || 156 is_exclusive_device(device) || (!device->status.present)) 157 return 0; 158 159 dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device)); 160 if (!dev) 161 return -ENOMEM; 162 163 dev->data = device->handle; 164 /* .enabled means the device can decode the resources */ 165 dev->active = device->status.enabled; 166 status = acpi_get_handle(device->handle, "_SRS", &temp); 167 if (ACPI_SUCCESS(status)) 168 dev->capabilities |= PNP_CONFIGURABLE; 169 dev->capabilities |= PNP_READ; 170 if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE)) 171 dev->capabilities |= PNP_WRITE; 172 if (device->flags.removable) 173 dev->capabilities |= PNP_REMOVABLE; 174 status = acpi_get_handle(device->handle, "_DIS", &temp); 175 if (ACPI_SUCCESS(status)) 176 dev->capabilities |= PNP_DISABLE; 177 178 if (strlen(acpi_device_name(device))) 179 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name)); 180 else 181 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name)); 182 183 if (dev->active) 184 pnpacpi_parse_allocated_resource(dev); 185 186 if (dev->capabilities & PNP_CONFIGURABLE) 187 pnpacpi_parse_resource_option_data(dev); 188 189 if (device->flags.compatible_ids) { 190 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 191 int i; 192 193 for (i = 0; i < cid_list->count; i++) { 194 if (!ispnpidacpi(cid_list->id[i].value)) 195 continue; 196 pnp_add_id(dev, cid_list->id[i].value); 197 } 198 } 199 200 /* clear out the damaged flags */ 201 if (!dev->active) 202 pnp_init_resources(dev); 203 pnp_add_device(dev); 204 num++; 205 206 return AE_OK; 207 } 208 209 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle, 210 u32 lvl, void *context, 211 void **rv) 212 { 213 struct acpi_device *device; 214 215 if (!acpi_bus_get_device(handle, &device)) 216 pnpacpi_add_device(device); 217 else 218 return AE_CTRL_DEPTH; 219 return AE_OK; 220 } 221 222 static int __init acpi_pnp_match(struct device *dev, void *_pnp) 223 { 224 struct acpi_device *acpi = to_acpi_device(dev); 225 struct pnp_dev *pnp = _pnp; 226 227 /* true means it matched */ 228 return acpi->flags.hardware_id 229 && !acpi_get_physical_device(acpi->handle) 230 && compare_pnp_id(pnp->id, acpi->pnp.hardware_id); 231 } 232 233 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle) 234 { 235 struct device *adev; 236 struct acpi_device *acpi; 237 238 adev = bus_find_device(&acpi_bus_type, NULL, 239 to_pnp_dev(dev), acpi_pnp_match); 240 if (!adev) 241 return -ENODEV; 242 243 acpi = to_acpi_device(adev); 244 *handle = acpi->handle; 245 put_device(adev); 246 return 0; 247 } 248 249 /* complete initialization of a PNPACPI device includes having 250 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling. 251 */ 252 static struct acpi_bus_type __initdata acpi_pnp_bus = { 253 .bus = &pnp_bus_type, 254 .find_device = acpi_pnp_find_device, 255 }; 256 257 int pnpacpi_disabled __initdata; 258 static int __init pnpacpi_init(void) 259 { 260 if (acpi_disabled || pnpacpi_disabled) { 261 printk(KERN_INFO "pnp: PnP ACPI: disabled\n"); 262 return 0; 263 } 264 printk(KERN_INFO "pnp: PnP ACPI init\n"); 265 pnp_register_protocol(&pnpacpi_protocol); 266 register_acpi_bus_type(&acpi_pnp_bus); 267 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL); 268 printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num); 269 unregister_acpi_bus_type(&acpi_pnp_bus); 270 pnp_platform_devices = 1; 271 return 0; 272 } 273 274 fs_initcall(pnpacpi_init); 275 276 static int __init pnpacpi_setup(char *str) 277 { 278 if (str == NULL) 279 return 1; 280 if (!strncmp(str, "off", 3)) 281 pnpacpi_disabled = 1; 282 return 1; 283 } 284 285 __setup("pnpacpi=", pnpacpi_setup); 286