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 /* We need only to blacklist devices that have already an acpi driver that 30 * can't use pnp layer. We don't need to blacklist device that are directly 31 * used by the kernel (PCI root, ...), as it is harmless and there were 32 * already present in pnpbios. But there is an exception for devices that 33 * have irqs (PIC, Timer) because we call acpi_register_gsi. 34 * Finaly only devices that have a CRS method need to be in this list. 35 */ 36 static char __initdata excluded_id_list[] = 37 "PNP0C09," /* EC */ 38 "PNP0C0F," /* Link device */ 39 "PNP0000," /* PIC */ 40 "PNP0100," /* Timer */ 41 ; 42 static inline int is_exclusive_device(struct acpi_device *dev) 43 { 44 return (!acpi_match_ids(dev, excluded_id_list)); 45 } 46 47 /* 48 * Compatible Device IDs 49 */ 50 #define TEST_HEX(c) \ 51 if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \ 52 return 0 53 #define TEST_ALPHA(c) \ 54 if (!('@' <= (c) || (c) <= 'Z')) \ 55 return 0 56 static int __init ispnpidacpi(char *id) 57 { 58 TEST_ALPHA(id[0]); 59 TEST_ALPHA(id[1]); 60 TEST_ALPHA(id[2]); 61 TEST_HEX(id[3]); 62 TEST_HEX(id[4]); 63 TEST_HEX(id[5]); 64 TEST_HEX(id[6]); 65 if (id[7] != '\0') 66 return 0; 67 return 1; 68 } 69 70 static void __init pnpidacpi_to_pnpid(char *id, char *str) 71 { 72 str[0] = id[0]; 73 str[1] = id[1]; 74 str[2] = id[2]; 75 str[3] = tolower(id[3]); 76 str[4] = tolower(id[4]); 77 str[5] = tolower(id[5]); 78 str[6] = tolower(id[6]); 79 str[7] = '\0'; 80 } 81 82 static int pnpacpi_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 83 { 84 acpi_status status; 85 status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data, 86 &dev->res); 87 return ACPI_FAILURE(status) ? -ENODEV : 0; 88 } 89 90 static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 91 { 92 acpi_handle handle = dev->data; 93 struct acpi_buffer buffer; 94 int ret = 0; 95 acpi_status status; 96 97 ret = pnpacpi_build_resource_template(handle, &buffer); 98 if (ret) 99 return ret; 100 ret = pnpacpi_encode_resources(res, &buffer); 101 if (ret) { 102 kfree(buffer.pointer); 103 return ret; 104 } 105 status = acpi_set_current_resources(handle, &buffer); 106 if (ACPI_FAILURE(status)) 107 ret = -EINVAL; 108 kfree(buffer.pointer); 109 return ret; 110 } 111 112 static int pnpacpi_disable_resources(struct pnp_dev *dev) 113 { 114 acpi_status status; 115 116 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */ 117 status = acpi_evaluate_object((acpi_handle)dev->data, 118 "_DIS", NULL, NULL); 119 return ACPI_FAILURE(status) ? -ENODEV : 0; 120 } 121 122 static struct pnp_protocol pnpacpi_protocol = { 123 .name = "Plug and Play ACPI", 124 .get = pnpacpi_get_resources, 125 .set = pnpacpi_set_resources, 126 .disable = pnpacpi_disable_resources, 127 }; 128 129 static int __init pnpacpi_add_device(struct acpi_device *device) 130 { 131 acpi_handle temp = NULL; 132 acpi_status status; 133 struct pnp_id *dev_id; 134 struct pnp_dev *dev; 135 136 status = acpi_get_handle(device->handle, "_CRS", &temp); 137 if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) || 138 is_exclusive_device(device)) 139 return 0; 140 141 pnp_dbg("ACPI device : hid %s", acpi_device_hid(device)); 142 dev = kcalloc(1, sizeof(struct pnp_dev), GFP_KERNEL); 143 if (!dev) { 144 pnp_err("Out of memory"); 145 return -ENOMEM; 146 } 147 dev->data = device->handle; 148 /* .enabled means if the device can decode the resources */ 149 dev->active = device->status.enabled; 150 status = acpi_get_handle(device->handle, "_SRS", &temp); 151 if (ACPI_SUCCESS(status)) 152 dev->capabilities |= PNP_CONFIGURABLE; 153 dev->capabilities |= PNP_READ; 154 if (device->flags.dynamic_status) 155 dev->capabilities |= PNP_WRITE; 156 if (device->flags.removable) 157 dev->capabilities |= PNP_REMOVABLE; 158 status = acpi_get_handle(device->handle, "_DIS", &temp); 159 if (ACPI_SUCCESS(status)) 160 dev->capabilities |= PNP_DISABLE; 161 162 dev->protocol = &pnpacpi_protocol; 163 164 if (strlen(acpi_device_name(device))) 165 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name)); 166 else 167 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name)); 168 169 dev->number = num; 170 171 /* set the initial values for the PnP device */ 172 dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL); 173 if (!dev_id) 174 goto err; 175 pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id); 176 pnp_add_id(dev_id, dev); 177 178 if(dev->active) { 179 /* parse allocated resource */ 180 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res); 181 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 182 pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id); 183 goto err1; 184 } 185 } 186 187 if(dev->capabilities & PNP_CONFIGURABLE) { 188 status = pnpacpi_parse_resource_option_data(device->handle, 189 dev); 190 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 191 pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id); 192 goto err1; 193 } 194 } 195 196 /* parse compatible ids */ 197 if (device->flags.compatible_ids) { 198 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 199 int i; 200 201 for (i = 0; i < cid_list->count; i++) { 202 if (!ispnpidacpi(cid_list->id[i].value)) 203 continue; 204 dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL); 205 if (!dev_id) 206 continue; 207 208 pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id); 209 pnp_add_id(dev_id, dev); 210 } 211 } 212 213 /* clear out the damaged flags */ 214 if (!dev->active) 215 pnp_init_resource_table(&dev->res); 216 pnp_add_device(dev); 217 num ++; 218 219 return AE_OK; 220 err1: 221 kfree(dev_id); 222 err: 223 kfree(dev); 224 return -EINVAL; 225 } 226 227 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle, 228 u32 lvl, void *context, void **rv) 229 { 230 struct acpi_device *device; 231 232 if (!acpi_bus_get_device(handle, &device)) 233 pnpacpi_add_device(device); 234 else 235 return AE_CTRL_DEPTH; 236 return AE_OK; 237 } 238 239 int pnpacpi_disabled __initdata; 240 static int __init pnpacpi_init(void) 241 { 242 if (acpi_disabled || pnpacpi_disabled) { 243 pnp_info("PnP ACPI: disabled"); 244 return 0; 245 } 246 pnp_info("PnP ACPI init"); 247 pnp_register_protocol(&pnpacpi_protocol); 248 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL); 249 pnp_info("PnP ACPI: found %d devices", num); 250 return 0; 251 } 252 subsys_initcall(pnpacpi_init); 253 254 static int __init pnpacpi_setup(char *str) 255 { 256 if (str == NULL) 257 return 1; 258 if (!strncmp(str, "off", 3)) 259 pnpacpi_disabled = 1; 260 return 1; 261 } 262 __setup("pnpacpi=", pnpacpi_setup); 263 264 #if 0 265 EXPORT_SYMBOL(pnpacpi_protocol); 266 #endif 267