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Rev | Author | Line No. | Line |
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1628 | serge | 1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects |
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3 | */ |
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4 | |||
5 | #include |
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6 | #include |
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7 | #include |
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8 | #include |
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9 | #include |
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10 | #include |
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11 | #include |
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12 | #include |
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13 | |||
14 | #include |
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15 | |||
16 | #include "internal.h" |
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17 | |||
18 | #define _COMPONENT ACPI_BUS_COMPONENT |
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19 | ACPI_MODULE_NAME("scan"); |
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20 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
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21 | extern struct acpi_device *acpi_root; |
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22 | |||
23 | #define ACPI_BUS_CLASS "system_bus" |
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24 | #define ACPI_BUS_HID "LNXSYBUS" |
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25 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
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26 | |||
27 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
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28 | |||
29 | static LIST_HEAD(acpi_device_list); |
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30 | static LIST_HEAD(acpi_bus_id_list); |
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31 | DEFINE_MUTEX(acpi_device_lock); |
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32 | LIST_HEAD(acpi_wakeup_device_list); |
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33 | |||
34 | struct acpi_device_bus_id{ |
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35 | char bus_id[15]; |
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36 | unsigned int instance_no; |
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37 | struct list_head node; |
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38 | }; |
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39 | |||
40 | /* |
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41 | * Creates hid/cid(s) string needed for modalias and uevent |
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42 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: |
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43 | * char *modalias: "acpi:IBM0001:ACPI0001" |
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44 | */ |
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45 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
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46 | int size) |
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47 | { |
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48 | int len; |
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49 | int count; |
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50 | struct acpi_hardware_id *id; |
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51 | |||
52 | len = snprintf(modalias, size, "acpi:"); |
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53 | size -= len; |
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54 | |||
55 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
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56 | count = snprintf(&modalias[len], size, "%s:", id->id); |
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57 | if (count < 0 || count >= size) |
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58 | return -EINVAL; |
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59 | len += count; |
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60 | size -= count; |
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61 | } |
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62 | |||
63 | modalias[len] = '\0'; |
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64 | return len; |
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65 | } |
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66 | |||
67 | static ssize_t |
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68 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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69 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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70 | int len; |
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71 | |||
72 | /* Device has no HID and no CID or string is >1024 */ |
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73 | len = create_modalias(acpi_dev, buf, 1024); |
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74 | if (len <= 0) |
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75 | return 0; |
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76 | buf[len++] = '\n'; |
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77 | return len; |
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78 | } |
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79 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); |
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80 | |||
81 | static void acpi_bus_hot_remove_device(void *context) |
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82 | { |
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83 | struct acpi_device *device; |
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84 | acpi_handle handle = context; |
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85 | struct acpi_object_list arg_list; |
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86 | union acpi_object arg; |
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87 | acpi_status status = AE_OK; |
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88 | |||
89 | if (acpi_bus_get_device(handle, &device)) |
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90 | return; |
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91 | |||
92 | if (!device) |
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93 | return; |
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94 | |||
95 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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96 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
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97 | |||
98 | if (acpi_bus_trim(device, 1)) { |
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99 | printk(KERN_ERR PREFIX |
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100 | "Removing device failed\n"); |
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101 | return; |
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102 | } |
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103 | |||
104 | /* power off device */ |
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105 | status = acpi_evaluate_object(handle, "_PS3", NULL, NULL); |
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106 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
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107 | printk(KERN_WARNING PREFIX |
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108 | "Power-off device failed\n"); |
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109 | |||
110 | if (device->flags.lockable) { |
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111 | arg_list.count = 1; |
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112 | arg_list.pointer = &arg; |
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113 | arg.type = ACPI_TYPE_INTEGER; |
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114 | arg.integer.value = 0; |
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115 | acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); |
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116 | } |
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117 | |||
118 | arg_list.count = 1; |
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119 | arg_list.pointer = &arg; |
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120 | arg.type = ACPI_TYPE_INTEGER; |
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121 | arg.integer.value = 1; |
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122 | |||
123 | /* |
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124 | * TBD: _EJD support. |
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125 | */ |
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126 | status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); |
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127 | if (ACPI_FAILURE(status)) |
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128 | printk(KERN_WARNING PREFIX |
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129 | "Eject device failed\n"); |
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130 | |||
131 | return; |
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132 | } |
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133 | |||
134 | static ssize_t |
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135 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
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136 | const char *buf, size_t count) |
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137 | { |
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138 | int ret = count; |
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139 | acpi_status status; |
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140 | acpi_object_type type = 0; |
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141 | struct acpi_device *acpi_device = to_acpi_device(d); |
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142 | |||
143 | if ((!count) || (buf[0] != '1')) { |
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144 | return -EINVAL; |
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145 | } |
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146 | #ifndef FORCE_EJECT |
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147 | if (acpi_device->driver == NULL) { |
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148 | ret = -ENODEV; |
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149 | goto err; |
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150 | } |
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151 | #endif |
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152 | status = acpi_get_type(acpi_device->handle, &type); |
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153 | if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { |
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154 | ret = -ENODEV; |
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155 | goto err; |
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156 | } |
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157 | |||
158 | acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle); |
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159 | err: |
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160 | return ret; |
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161 | } |
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162 | |||
163 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
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164 | |||
165 | static ssize_t |
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166 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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167 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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168 | |||
169 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
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170 | } |
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171 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
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172 | |||
173 | static ssize_t |
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174 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { |
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175 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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176 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; |
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177 | int result; |
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178 | |||
179 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
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180 | if (result) |
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181 | goto end; |
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182 | |||
183 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
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184 | kfree(path.pointer); |
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185 | end: |
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186 | return result; |
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187 | } |
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188 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
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189 | |||
190 | static int acpi_device_setup_files(struct acpi_device *dev) |
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191 | { |
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192 | acpi_status status; |
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193 | acpi_handle temp; |
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194 | int result = 0; |
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195 | |||
196 | /* |
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197 | * Devices gotten from FADT don't have a "path" attribute |
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198 | */ |
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199 | if (dev->handle) { |
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200 | result = device_create_file(&dev->dev, &dev_attr_path); |
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201 | if (result) |
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202 | goto end; |
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203 | } |
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204 | |||
205 | result = device_create_file(&dev->dev, &dev_attr_hid); |
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206 | if (result) |
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207 | goto end; |
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208 | |||
209 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
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210 | if (result) |
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211 | goto end; |
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212 | |||
213 | /* |
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214 | * If device has _EJ0, 'eject' file is created that is used to trigger |
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215 | * hot-removal function from userland. |
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216 | */ |
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217 | status = acpi_get_handle(dev->handle, "_EJ0", &temp); |
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218 | if (ACPI_SUCCESS(status)) |
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219 | result = device_create_file(&dev->dev, &dev_attr_eject); |
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220 | end: |
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221 | return result; |
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222 | } |
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223 | |||
224 | static void acpi_device_remove_files(struct acpi_device *dev) |
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225 | { |
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226 | acpi_status status; |
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227 | acpi_handle temp; |
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228 | |||
229 | /* |
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230 | * If device has _EJ0, 'eject' file is created that is used to trigger |
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231 | * hot-removal function from userland. |
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232 | */ |
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233 | status = acpi_get_handle(dev->handle, "_EJ0", &temp); |
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234 | if (ACPI_SUCCESS(status)) |
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235 | device_remove_file(&dev->dev, &dev_attr_eject); |
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236 | |||
237 | device_remove_file(&dev->dev, &dev_attr_modalias); |
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238 | device_remove_file(&dev->dev, &dev_attr_hid); |
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239 | if (dev->handle) |
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240 | device_remove_file(&dev->dev, &dev_attr_path); |
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241 | } |
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242 | /* -------------------------------------------------------------------------- |
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243 | ACPI Bus operations |
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244 | -------------------------------------------------------------------------- */ |
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245 | |||
246 | int acpi_match_device_ids(struct acpi_device *device, |
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247 | const struct acpi_device_id *ids) |
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248 | { |
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249 | const struct acpi_device_id *id; |
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250 | struct acpi_hardware_id *hwid; |
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251 | |||
252 | /* |
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253 | * If the device is not present, it is unnecessary to load device |
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254 | * driver for it. |
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255 | */ |
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256 | if (!device->status.present) |
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257 | return -ENODEV; |
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258 | |||
259 | for (id = ids; id->id[0]; id++) |
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260 | list_for_each_entry(hwid, &device->pnp.ids, list) |
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261 | if (!strcmp((char *) id->id, hwid->id)) |
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262 | return 0; |
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263 | |||
264 | return -ENOENT; |
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265 | } |
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266 | EXPORT_SYMBOL(acpi_match_device_ids); |
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267 | |||
268 | static void acpi_free_ids(struct acpi_device *device) |
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269 | { |
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270 | struct acpi_hardware_id *id, *tmp; |
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271 | |||
272 | list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) { |
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273 | kfree(id->id); |
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274 | kfree(id); |
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275 | } |
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276 | } |
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277 | |||
278 | static void acpi_device_release(struct device *dev) |
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279 | { |
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280 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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281 | |||
282 | acpi_free_ids(acpi_dev); |
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283 | kfree(acpi_dev); |
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284 | } |
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285 | |||
286 | static int acpi_device_suspend(struct device *dev, pm_message_t state) |
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287 | { |
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288 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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289 | struct acpi_driver *acpi_drv = acpi_dev->driver; |
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290 | |||
291 | if (acpi_drv && acpi_drv->ops.suspend) |
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292 | return acpi_drv->ops.suspend(acpi_dev, state); |
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293 | return 0; |
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294 | } |
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295 | |||
296 | static int acpi_device_resume(struct device *dev) |
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297 | { |
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298 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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299 | struct acpi_driver *acpi_drv = acpi_dev->driver; |
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300 | |||
301 | if (acpi_drv && acpi_drv->ops.resume) |
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302 | return acpi_drv->ops.resume(acpi_dev); |
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303 | return 0; |
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304 | } |
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305 | |||
306 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
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307 | { |
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308 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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309 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); |
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310 | |||
311 | return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
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312 | } |
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313 | |||
314 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
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315 | { |
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316 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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317 | int len; |
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318 | |||
319 | if (add_uevent_var(env, "MODALIAS=")) |
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320 | return -ENOMEM; |
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321 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], |
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322 | sizeof(env->buf) - env->buflen); |
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323 | if (len >= (sizeof(env->buf) - env->buflen)) |
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324 | return -ENOMEM; |
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325 | env->buflen += len; |
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326 | return 0; |
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327 | } |
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328 | |||
329 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
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330 | { |
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331 | struct acpi_device *device = data; |
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332 | |||
333 | device->driver->ops.notify(device, event); |
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334 | } |
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335 | |||
336 | static acpi_status acpi_device_notify_fixed(void *data) |
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337 | { |
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338 | struct acpi_device *device = data; |
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339 | |||
340 | /* Fixed hardware devices have no handles */ |
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341 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); |
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342 | return AE_OK; |
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343 | } |
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344 | |||
345 | static int acpi_device_install_notify_handler(struct acpi_device *device) |
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346 | { |
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347 | acpi_status status; |
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348 | |||
349 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
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350 | status = |
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351 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
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352 | acpi_device_notify_fixed, |
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353 | device); |
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354 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
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355 | status = |
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356 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
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357 | acpi_device_notify_fixed, |
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358 | device); |
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359 | else |
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360 | status = acpi_install_notify_handler(device->handle, |
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361 | ACPI_DEVICE_NOTIFY, |
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362 | acpi_device_notify, |
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363 | device); |
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364 | |||
365 | if (ACPI_FAILURE(status)) |
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366 | return -EINVAL; |
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367 | return 0; |
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368 | } |
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369 | |||
370 | static void acpi_device_remove_notify_handler(struct acpi_device *device) |
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371 | { |
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372 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
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373 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
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374 | acpi_device_notify_fixed); |
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375 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
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376 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
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377 | acpi_device_notify_fixed); |
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378 | else |
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379 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, |
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380 | acpi_device_notify); |
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381 | } |
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382 | |||
383 | static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); |
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384 | static int acpi_start_single_object(struct acpi_device *); |
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385 | static int acpi_device_probe(struct device * dev) |
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386 | { |
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387 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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388 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); |
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389 | int ret; |
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390 | |||
391 | ret = acpi_bus_driver_init(acpi_dev, acpi_drv); |
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392 | if (!ret) { |
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393 | if (acpi_dev->bus_ops.acpi_op_start) |
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394 | acpi_start_single_object(acpi_dev); |
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395 | |||
396 | if (acpi_drv->ops.notify) { |
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397 | ret = acpi_device_install_notify_handler(acpi_dev); |
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398 | if (ret) { |
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399 | if (acpi_drv->ops.remove) |
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400 | acpi_drv->ops.remove(acpi_dev, |
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401 | acpi_dev->removal_type); |
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402 | return ret; |
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403 | } |
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404 | } |
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405 | |||
406 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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407 | "Found driver [%s] for device [%s]\n", |
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408 | acpi_drv->name, acpi_dev->pnp.bus_id)); |
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409 | get_device(dev); |
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410 | } |
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411 | return ret; |
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412 | } |
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413 | |||
414 | static int acpi_device_remove(struct device * dev) |
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415 | { |
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416 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
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417 | struct acpi_driver *acpi_drv = acpi_dev->driver; |
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418 | |||
419 | if (acpi_drv) { |
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420 | if (acpi_drv->ops.notify) |
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421 | acpi_device_remove_notify_handler(acpi_dev); |
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422 | if (acpi_drv->ops.remove) |
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423 | acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); |
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424 | } |
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425 | acpi_dev->driver = NULL; |
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426 | acpi_dev->driver_data = NULL; |
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427 | |||
428 | put_device(dev); |
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429 | return 0; |
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430 | } |
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431 | |||
432 | struct bus_type acpi_bus_type = { |
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433 | .name = "acpi", |
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434 | .suspend = acpi_device_suspend, |
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435 | .resume = acpi_device_resume, |
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436 | .match = acpi_bus_match, |
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437 | .probe = acpi_device_probe, |
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438 | .remove = acpi_device_remove, |
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439 | .uevent = acpi_device_uevent, |
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440 | }; |
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441 | |||
442 | static int acpi_device_register(struct acpi_device *device) |
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443 | { |
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444 | int result; |
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445 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
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446 | int found = 0; |
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447 | |||
448 | /* |
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449 | * Linkage |
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450 | * ------- |
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451 | * Link this device to its parent and siblings. |
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452 | */ |
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453 | INIT_LIST_HEAD(&device->children); |
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454 | INIT_LIST_HEAD(&device->node); |
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455 | INIT_LIST_HEAD(&device->wakeup_list); |
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456 | |||
457 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
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458 | if (!new_bus_id) { |
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459 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
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460 | return -ENOMEM; |
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461 | } |
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462 | |||
463 | mutex_lock(&acpi_device_lock); |
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464 | /* |
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465 | * Find suitable bus_id and instance number in acpi_bus_id_list |
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466 | * If failed, create one and link it into acpi_bus_id_list |
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467 | */ |
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468 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { |
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469 | if (!strcmp(acpi_device_bus_id->bus_id, |
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470 | acpi_device_hid(device))) { |
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471 | acpi_device_bus_id->instance_no++; |
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472 | found = 1; |
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473 | kfree(new_bus_id); |
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474 | break; |
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475 | } |
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476 | } |
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477 | if (!found) { |
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478 | acpi_device_bus_id = new_bus_id; |
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479 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
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480 | acpi_device_bus_id->instance_no = 0; |
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481 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); |
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482 | } |
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483 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
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484 | |||
485 | if (device->parent) |
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486 | list_add_tail(&device->node, &device->parent->children); |
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487 | |||
488 | if (device->wakeup.flags.valid) |
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489 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); |
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490 | mutex_unlock(&acpi_device_lock); |
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491 | |||
492 | if (device->parent) |
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493 | device->dev.parent = &device->parent->dev; |
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494 | device->dev.bus = &acpi_bus_type; |
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495 | device->dev.release = &acpi_device_release; |
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496 | result = device_register(&device->dev); |
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497 | if (result) { |
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498 | dev_err(&device->dev, "Error registering device\n"); |
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499 | goto end; |
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500 | } |
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501 | |||
502 | result = acpi_device_setup_files(device); |
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503 | if (result) |
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504 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
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505 | dev_name(&device->dev)); |
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506 | |||
507 | device->removal_type = ACPI_BUS_REMOVAL_NORMAL; |
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508 | return 0; |
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509 | end: |
||
510 | mutex_lock(&acpi_device_lock); |
||
511 | if (device->parent) |
||
512 | list_del(&device->node); |
||
513 | list_del(&device->wakeup_list); |
||
514 | mutex_unlock(&acpi_device_lock); |
||
515 | return result; |
||
516 | } |
||
517 | |||
518 | static void acpi_device_unregister(struct acpi_device *device, int type) |
||
519 | { |
||
520 | mutex_lock(&acpi_device_lock); |
||
521 | if (device->parent) |
||
522 | list_del(&device->node); |
||
523 | |||
524 | list_del(&device->wakeup_list); |
||
525 | mutex_unlock(&acpi_device_lock); |
||
526 | |||
527 | acpi_detach_data(device->handle, acpi_bus_data_handler); |
||
528 | |||
529 | acpi_device_remove_files(device); |
||
530 | device_unregister(&device->dev); |
||
531 | } |
||
532 | |||
533 | /* -------------------------------------------------------------------------- |
||
534 | Driver Management |
||
535 | -------------------------------------------------------------------------- */ |
||
536 | /** |
||
537 | * acpi_bus_driver_init - add a device to a driver |
||
538 | * @device: the device to add and initialize |
||
539 | * @driver: driver for the device |
||
540 | * |
||
541 | * Used to initialize a device via its device driver. Called whenever a |
||
542 | * driver is bound to a device. Invokes the driver's add() ops. |
||
543 | */ |
||
544 | static int |
||
545 | acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) |
||
546 | { |
||
547 | int result = 0; |
||
548 | |||
549 | if (!device || !driver) |
||
550 | return -EINVAL; |
||
551 | |||
552 | if (!driver->ops.add) |
||
553 | return -ENOSYS; |
||
554 | |||
555 | result = driver->ops.add(device); |
||
556 | if (result) { |
||
557 | device->driver = NULL; |
||
558 | device->driver_data = NULL; |
||
559 | return result; |
||
560 | } |
||
561 | |||
562 | device->driver = driver; |
||
563 | |||
564 | /* |
||
565 | * TBD - Configuration Management: Assign resources to device based |
||
566 | * upon possible configuration and currently allocated resources. |
||
567 | */ |
||
568 | |||
569 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
||
570 | "Driver successfully bound to device\n")); |
||
571 | return 0; |
||
572 | } |
||
573 | |||
574 | static int acpi_start_single_object(struct acpi_device *device) |
||
575 | { |
||
576 | int result = 0; |
||
577 | struct acpi_driver *driver; |
||
578 | |||
579 | |||
580 | if (!(driver = device->driver)) |
||
581 | return 0; |
||
582 | |||
583 | if (driver->ops.start) { |
||
584 | result = driver->ops.start(device); |
||
585 | if (result && driver->ops.remove) |
||
586 | driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); |
||
587 | } |
||
588 | |||
589 | return result; |
||
590 | } |
||
591 | |||
592 | /** |
||
593 | * acpi_bus_register_driver - register a driver with the ACPI bus |
||
594 | * @driver: driver being registered |
||
595 | * |
||
596 | * Registers a driver with the ACPI bus. Searches the namespace for all |
||
597 | * devices that match the driver's criteria and binds. Returns zero for |
||
598 | * success or a negative error status for failure. |
||
599 | */ |
||
600 | int acpi_bus_register_driver(struct acpi_driver *driver) |
||
601 | { |
||
602 | int ret; |
||
603 | |||
604 | if (acpi_disabled) |
||
605 | return -ENODEV; |
||
606 | driver->drv.name = driver->name; |
||
607 | driver->drv.bus = &acpi_bus_type; |
||
608 | driver->drv.owner = driver->owner; |
||
609 | |||
610 | ret = driver_register(&driver->drv); |
||
611 | return ret; |
||
612 | } |
||
613 | |||
614 | EXPORT_SYMBOL(acpi_bus_register_driver); |
||
615 | |||
616 | /** |
||
617 | * acpi_bus_unregister_driver - unregisters a driver with the APIC bus |
||
618 | * @driver: driver to unregister |
||
619 | * |
||
620 | * Unregisters a driver with the ACPI bus. Searches the namespace for all |
||
621 | * devices that match the driver's criteria and unbinds. |
||
622 | */ |
||
623 | void acpi_bus_unregister_driver(struct acpi_driver *driver) |
||
624 | { |
||
625 | driver_unregister(&driver->drv); |
||
626 | } |
||
627 | |||
628 | EXPORT_SYMBOL(acpi_bus_unregister_driver); |
||
629 | |||
630 | /* -------------------------------------------------------------------------- |
||
631 | Device Enumeration |
||
632 | -------------------------------------------------------------------------- */ |
||
633 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
||
634 | { |
||
635 | acpi_status status; |
||
636 | int ret; |
||
637 | struct acpi_device *device; |
||
638 | |||
639 | /* |
||
640 | * Fixed hardware devices do not appear in the namespace and do not |
||
641 | * have handles, but we fabricate acpi_devices for them, so we have |
||
642 | * to deal with them specially. |
||
643 | */ |
||
644 | if (handle == NULL) |
||
645 | return acpi_root; |
||
646 | |||
647 | do { |
||
648 | status = acpi_get_parent(handle, &handle); |
||
649 | if (status == AE_NULL_ENTRY) |
||
650 | return NULL; |
||
651 | if (ACPI_FAILURE(status)) |
||
652 | return acpi_root; |
||
653 | |||
654 | ret = acpi_bus_get_device(handle, &device); |
||
655 | if (ret == 0) |
||
656 | return device; |
||
657 | } while (1); |
||
658 | } |
||
659 | |||
660 | acpi_status |
||
661 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) |
||
662 | { |
||
663 | acpi_status status; |
||
664 | acpi_handle tmp; |
||
665 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
||
666 | union acpi_object *obj; |
||
667 | |||
668 | status = acpi_get_handle(handle, "_EJD", &tmp); |
||
669 | if (ACPI_FAILURE(status)) |
||
670 | return status; |
||
671 | |||
672 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); |
||
673 | if (ACPI_SUCCESS(status)) { |
||
674 | obj = buffer.pointer; |
||
675 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
||
676 | ejd); |
||
677 | kfree(buffer.pointer); |
||
678 | } |
||
679 | return status; |
||
680 | } |
||
681 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); |
||
682 | |||
683 | void acpi_bus_data_handler(acpi_handle handle, void *context) |
||
684 | { |
||
685 | |||
686 | /* TBD */ |
||
687 | |||
688 | return; |
||
689 | } |
||
690 | |||
691 | static int acpi_bus_get_perf_flags(struct acpi_device *device) |
||
692 | { |
||
693 | device->performance.state = ACPI_STATE_UNKNOWN; |
||
694 | return 0; |
||
695 | } |
||
696 | |||
697 | static acpi_status |
||
698 | acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, |
||
699 | union acpi_object *package) |
||
700 | { |
||
701 | int i = 0; |
||
702 | union acpi_object *element = NULL; |
||
703 | |||
704 | if (!device || !package || (package->package.count < 2)) |
||
705 | return AE_BAD_PARAMETER; |
||
706 | |||
707 | element = &(package->package.elements[0]); |
||
708 | if (!element) |
||
709 | return AE_BAD_PARAMETER; |
||
710 | if (element->type == ACPI_TYPE_PACKAGE) { |
||
711 | if ((element->package.count < 2) || |
||
712 | (element->package.elements[0].type != |
||
713 | ACPI_TYPE_LOCAL_REFERENCE) |
||
714 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
||
715 | return AE_BAD_DATA; |
||
716 | device->wakeup.gpe_device = |
||
717 | element->package.elements[0].reference.handle; |
||
718 | device->wakeup.gpe_number = |
||
719 | (u32) element->package.elements[1].integer.value; |
||
720 | } else if (element->type == ACPI_TYPE_INTEGER) { |
||
721 | device->wakeup.gpe_number = element->integer.value; |
||
722 | } else |
||
723 | return AE_BAD_DATA; |
||
724 | |||
725 | element = &(package->package.elements[1]); |
||
726 | if (element->type != ACPI_TYPE_INTEGER) { |
||
727 | return AE_BAD_DATA; |
||
728 | } |
||
729 | device->wakeup.sleep_state = element->integer.value; |
||
730 | |||
731 | if ((package->package.count - 2) > ACPI_MAX_HANDLES) { |
||
732 | return AE_NO_MEMORY; |
||
733 | } |
||
734 | device->wakeup.resources.count = package->package.count - 2; |
||
735 | for (i = 0; i < device->wakeup.resources.count; i++) { |
||
736 | element = &(package->package.elements[i + 2]); |
||
737 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) |
||
738 | return AE_BAD_DATA; |
||
739 | |||
740 | device->wakeup.resources.handles[i] = element->reference.handle; |
||
741 | } |
||
742 | |||
743 | acpi_gpe_can_wake(device->wakeup.gpe_device, device->wakeup.gpe_number); |
||
744 | |||
745 | return AE_OK; |
||
746 | } |
||
747 | |||
748 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
||
749 | { |
||
750 | struct acpi_device_id button_device_ids[] = { |
||
751 | {"PNP0C0D", 0}, |
||
752 | {"PNP0C0C", 0}, |
||
753 | {"PNP0C0E", 0}, |
||
754 | {"", 0}, |
||
755 | }; |
||
756 | acpi_status status; |
||
757 | acpi_event_status event_status; |
||
758 | |||
759 | device->wakeup.run_wake_count = 0; |
||
760 | device->wakeup.flags.notifier_present = 0; |
||
761 | |||
762 | /* Power button, Lid switch always enable wakeup */ |
||
763 | if (!acpi_match_device_ids(device, button_device_ids)) { |
||
764 | device->wakeup.flags.run_wake = 1; |
||
765 | device->wakeup.flags.always_enabled = 1; |
||
766 | return; |
||
767 | } |
||
768 | |||
769 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
||
770 | device->wakeup.gpe_number, |
||
771 | &event_status); |
||
772 | if (status == AE_OK) |
||
773 | device->wakeup.flags.run_wake = |
||
774 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); |
||
775 | } |
||
776 | |||
777 | static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
||
778 | { |
||
779 | acpi_status status = 0; |
||
780 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
||
781 | union acpi_object *package = NULL; |
||
782 | int psw_error; |
||
783 | |||
784 | /* _PRW */ |
||
785 | status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); |
||
786 | if (ACPI_FAILURE(status)) { |
||
787 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); |
||
788 | goto end; |
||
789 | } |
||
790 | |||
791 | package = (union acpi_object *)buffer.pointer; |
||
792 | status = acpi_bus_extract_wakeup_device_power_package(device, package); |
||
793 | if (ACPI_FAILURE(status)) { |
||
794 | ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); |
||
795 | goto end; |
||
796 | } |
||
797 | |||
798 | kfree(buffer.pointer); |
||
799 | |||
800 | device->wakeup.flags.valid = 1; |
||
801 | device->wakeup.prepare_count = 0; |
||
802 | acpi_bus_set_run_wake_flags(device); |
||
803 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
||
804 | * system for the ACPI device with the _PRW object. |
||
805 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. |
||
806 | * So it is necessary to call _DSW object first. Only when it is not |
||
807 | * present will the _PSW object used. |
||
808 | */ |
||
809 | psw_error = acpi_device_sleep_wake(device, 0, 0, 0); |
||
810 | if (psw_error) |
||
811 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
||
812 | "error in _DSW or _PSW evaluation\n")); |
||
813 | |||
814 | end: |
||
815 | if (ACPI_FAILURE(status)) |
||
816 | device->flags.wake_capable = 0; |
||
817 | return 0; |
||
818 | } |
||
819 | |||
820 | static int acpi_bus_get_power_flags(struct acpi_device *device) |
||
821 | { |
||
822 | acpi_status status = 0; |
||
823 | acpi_handle handle = NULL; |
||
824 | u32 i = 0; |
||
825 | |||
826 | |||
827 | /* |
||
828 | * Power Management Flags |
||
829 | */ |
||
830 | status = acpi_get_handle(device->handle, "_PSC", &handle); |
||
831 | if (ACPI_SUCCESS(status)) |
||
832 | device->power.flags.explicit_get = 1; |
||
833 | status = acpi_get_handle(device->handle, "_IRC", &handle); |
||
834 | if (ACPI_SUCCESS(status)) |
||
835 | device->power.flags.inrush_current = 1; |
||
836 | |||
837 | /* |
||
838 | * Enumerate supported power management states |
||
839 | */ |
||
840 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { |
||
841 | struct acpi_device_power_state *ps = &device->power.states[i]; |
||
842 | char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; |
||
843 | |||
844 | /* Evaluate "_PRx" to se if power resources are referenced */ |
||
845 | acpi_evaluate_reference(device->handle, object_name, NULL, |
||
846 | &ps->resources); |
||
847 | if (ps->resources.count) { |
||
848 | device->power.flags.power_resources = 1; |
||
849 | ps->flags.valid = 1; |
||
850 | } |
||
851 | |||
852 | /* Evaluate "_PSx" to see if we can do explicit sets */ |
||
853 | object_name[2] = 'S'; |
||
854 | status = acpi_get_handle(device->handle, object_name, &handle); |
||
855 | if (ACPI_SUCCESS(status)) { |
||
856 | ps->flags.explicit_set = 1; |
||
857 | ps->flags.valid = 1; |
||
858 | } |
||
859 | |||
860 | /* State is valid if we have some power control */ |
||
861 | if (ps->resources.count || ps->flags.explicit_set) |
||
862 | ps->flags.valid = 1; |
||
863 | |||
864 | ps->power = -1; /* Unknown - driver assigned */ |
||
865 | ps->latency = -1; /* Unknown - driver assigned */ |
||
866 | } |
||
867 | |||
868 | /* Set defaults for D0 and D3 states (always valid) */ |
||
869 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
||
870 | device->power.states[ACPI_STATE_D0].power = 100; |
||
871 | device->power.states[ACPI_STATE_D3].flags.valid = 1; |
||
872 | device->power.states[ACPI_STATE_D3].power = 0; |
||
873 | |||
874 | /* TBD: System wake support and resource requirements. */ |
||
875 | |||
876 | device->power.state = ACPI_STATE_UNKNOWN; |
||
877 | acpi_bus_get_power(device->handle, &(device->power.state)); |
||
878 | |||
879 | return 0; |
||
880 | } |
||
881 | |||
882 | static int acpi_bus_get_flags(struct acpi_device *device) |
||
883 | { |
||
884 | acpi_status status = AE_OK; |
||
885 | acpi_handle temp = NULL; |
||
886 | |||
887 | |||
888 | /* Presence of _STA indicates 'dynamic_status' */ |
||
889 | status = acpi_get_handle(device->handle, "_STA", &temp); |
||
890 | if (ACPI_SUCCESS(status)) |
||
891 | device->flags.dynamic_status = 1; |
||
892 | |||
893 | /* Presence of _RMV indicates 'removable' */ |
||
894 | status = acpi_get_handle(device->handle, "_RMV", &temp); |
||
895 | if (ACPI_SUCCESS(status)) |
||
896 | device->flags.removable = 1; |
||
897 | |||
898 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ |
||
899 | status = acpi_get_handle(device->handle, "_EJD", &temp); |
||
900 | if (ACPI_SUCCESS(status)) |
||
901 | device->flags.ejectable = 1; |
||
902 | else { |
||
903 | status = acpi_get_handle(device->handle, "_EJ0", &temp); |
||
904 | if (ACPI_SUCCESS(status)) |
||
905 | device->flags.ejectable = 1; |
||
906 | } |
||
907 | |||
908 | /* Presence of _LCK indicates 'lockable' */ |
||
909 | status = acpi_get_handle(device->handle, "_LCK", &temp); |
||
910 | if (ACPI_SUCCESS(status)) |
||
911 | device->flags.lockable = 1; |
||
912 | |||
913 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
||
914 | status = acpi_get_handle(device->handle, "_PS0", &temp); |
||
915 | if (ACPI_FAILURE(status)) |
||
916 | status = acpi_get_handle(device->handle, "_PR0", &temp); |
||
917 | if (ACPI_SUCCESS(status)) |
||
918 | device->flags.power_manageable = 1; |
||
919 | |||
920 | /* Presence of _PRW indicates wake capable */ |
||
921 | status = acpi_get_handle(device->handle, "_PRW", &temp); |
||
922 | if (ACPI_SUCCESS(status)) |
||
923 | device->flags.wake_capable = 1; |
||
924 | |||
925 | /* TBD: Performance management */ |
||
926 | |||
927 | return 0; |
||
928 | } |
||
929 | |||
930 | static void acpi_device_get_busid(struct acpi_device *device) |
||
931 | { |
||
932 | char bus_id[5] = { '?', 0 }; |
||
933 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; |
||
934 | int i = 0; |
||
935 | |||
936 | /* |
||
937 | * Bus ID |
||
938 | * ------ |
||
939 | * The device's Bus ID is simply the object name. |
||
940 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? |
||
941 | */ |
||
942 | if (ACPI_IS_ROOT_DEVICE(device)) { |
||
943 | strcpy(device->pnp.bus_id, "ACPI"); |
||
944 | return; |
||
945 | } |
||
946 | |||
947 | switch (device->device_type) { |
||
948 | case ACPI_BUS_TYPE_POWER_BUTTON: |
||
949 | strcpy(device->pnp.bus_id, "PWRF"); |
||
950 | break; |
||
951 | case ACPI_BUS_TYPE_SLEEP_BUTTON: |
||
952 | strcpy(device->pnp.bus_id, "SLPF"); |
||
953 | break; |
||
954 | default: |
||
955 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
||
956 | /* Clean up trailing underscores (if any) */ |
||
957 | for (i = 3; i > 1; i--) { |
||
958 | if (bus_id[i] == '_') |
||
959 | bus_id[i] = '\0'; |
||
960 | else |
||
961 | break; |
||
962 | } |
||
963 | strcpy(device->pnp.bus_id, bus_id); |
||
964 | break; |
||
965 | } |
||
966 | } |
||
967 | |||
968 | /* |
||
969 | * acpi_bay_match - see if a device is an ejectable driver bay |
||
970 | * |
||
971 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, |
||
972 | * then we can safely call it an ejectable drive bay |
||
973 | */ |
||
974 | static int acpi_bay_match(struct acpi_device *device){ |
||
975 | acpi_status status; |
||
976 | acpi_handle handle; |
||
977 | acpi_handle tmp; |
||
978 | acpi_handle phandle; |
||
979 | |||
980 | handle = device->handle; |
||
981 | |||
982 | status = acpi_get_handle(handle, "_EJ0", &tmp); |
||
983 | if (ACPI_FAILURE(status)) |
||
984 | return -ENODEV; |
||
985 | |||
986 | if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || |
||
987 | (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || |
||
988 | (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || |
||
989 | (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) |
||
990 | return 0; |
||
991 | |||
992 | if (acpi_get_parent(handle, &phandle)) |
||
993 | return -ENODEV; |
||
994 | |||
995 | if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || |
||
996 | (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || |
||
997 | (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || |
||
998 | (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) |
||
999 | return 0; |
||
1000 | |||
1001 | return -ENODEV; |
||
1002 | } |
||
1003 | |||
1004 | /* |
||
1005 | * acpi_dock_match - see if a device has a _DCK method |
||
1006 | */ |
||
1007 | static int acpi_dock_match(struct acpi_device *device) |
||
1008 | { |
||
1009 | acpi_handle tmp; |
||
1010 | return acpi_get_handle(device->handle, "_DCK", &tmp); |
||
1011 | } |
||
1012 | |||
1013 | char *acpi_device_hid(struct acpi_device *device) |
||
1014 | { |
||
1015 | struct acpi_hardware_id *hid; |
||
1016 | |||
1017 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
||
1018 | return hid->id; |
||
1019 | } |
||
1020 | EXPORT_SYMBOL(acpi_device_hid); |
||
1021 | |||
1022 | static void acpi_add_id(struct acpi_device *device, const char *dev_id) |
||
1023 | { |
||
1024 | struct acpi_hardware_id *id; |
||
1025 | |||
1026 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
||
1027 | if (!id) |
||
1028 | return; |
||
1029 | |||
1030 | id->id = kmalloc(strlen(dev_id) + 1, GFP_KERNEL); |
||
1031 | if (!id->id) { |
||
1032 | kfree(id); |
||
1033 | return; |
||
1034 | } |
||
1035 | |||
1036 | strcpy(id->id, dev_id); |
||
1037 | list_add_tail(&id->list, &device->pnp.ids); |
||
1038 | } |
||
1039 | |||
1040 | /* |
||
1041 | * Old IBM workstations have a DSDT bug wherein the SMBus object |
||
1042 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" |
||
1043 | * prefix. Work around this. |
||
1044 | */ |
||
1045 | static int acpi_ibm_smbus_match(struct acpi_device *device) |
||
1046 | { |
||
1047 | acpi_handle h_dummy; |
||
1048 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; |
||
1049 | int result; |
||
1050 | |||
1051 | if (!dmi_name_in_vendors("IBM")) |
||
1052 | return -ENODEV; |
||
1053 | |||
1054 | /* Look for SMBS object */ |
||
1055 | result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path); |
||
1056 | if (result) |
||
1057 | return result; |
||
1058 | |||
1059 | if (strcmp("SMBS", path.pointer)) { |
||
1060 | result = -ENODEV; |
||
1061 | goto out; |
||
1062 | } |
||
1063 | |||
1064 | /* Does it have the necessary (but misnamed) methods? */ |
||
1065 | result = -ENODEV; |
||
1066 | if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) && |
||
1067 | ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) && |
||
1068 | ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy))) |
||
1069 | result = 0; |
||
1070 | out: |
||
1071 | kfree(path.pointer); |
||
1072 | return result; |
||
1073 | } |
||
1074 | |||
1075 | static void acpi_device_set_id(struct acpi_device *device) |
||
1076 | { |
||
1077 | acpi_status status; |
||
1078 | struct acpi_device_info *info; |
||
1079 | struct acpica_device_id_list *cid_list; |
||
1080 | int i; |
||
1081 | |||
1082 | switch (device->device_type) { |
||
1083 | case ACPI_BUS_TYPE_DEVICE: |
||
1084 | if (ACPI_IS_ROOT_DEVICE(device)) { |
||
1085 | acpi_add_id(device, ACPI_SYSTEM_HID); |
||
1086 | break; |
||
1087 | } |
||
1088 | |||
1089 | status = acpi_get_object_info(device->handle, &info); |
||
1090 | if (ACPI_FAILURE(status)) { |
||
1091 | printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__); |
||
1092 | return; |
||
1093 | } |
||
1094 | |||
1095 | if (info->valid & ACPI_VALID_HID) |
||
1096 | acpi_add_id(device, info->hardware_id.string); |
||
1097 | if (info->valid & ACPI_VALID_CID) { |
||
1098 | cid_list = &info->compatible_id_list; |
||
1099 | for (i = 0; i < cid_list->count; i++) |
||
1100 | acpi_add_id(device, cid_list->ids[i].string); |
||
1101 | } |
||
1102 | if (info->valid & ACPI_VALID_ADR) { |
||
1103 | device->pnp.bus_address = info->address; |
||
1104 | device->flags.bus_address = 1; |
||
1105 | } |
||
1106 | |||
1107 | kfree(info); |
||
1108 | |||
1109 | /* |
||
1110 | * Some devices don't reliably have _HIDs & _CIDs, so add |
||
1111 | * synthetic HIDs to make sure drivers can find them. |
||
1112 | */ |
||
1113 | if (acpi_is_video_device(device)) |
||
1114 | acpi_add_id(device, ACPI_VIDEO_HID); |
||
1115 | else if (ACPI_SUCCESS(acpi_bay_match(device))) |
||
1116 | acpi_add_id(device, ACPI_BAY_HID); |
||
1117 | else if (ACPI_SUCCESS(acpi_dock_match(device))) |
||
1118 | acpi_add_id(device, ACPI_DOCK_HID); |
||
1119 | else if (!acpi_ibm_smbus_match(device)) |
||
1120 | acpi_add_id(device, ACPI_SMBUS_IBM_HID); |
||
1121 | else if (!acpi_device_hid(device) && |
||
1122 | ACPI_IS_ROOT_DEVICE(device->parent)) { |
||
1123 | acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ |
||
1124 | strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); |
||
1125 | strcpy(device->pnp.device_class, ACPI_BUS_CLASS); |
||
1126 | } |
||
1127 | |||
1128 | break; |
||
1129 | case ACPI_BUS_TYPE_POWER: |
||
1130 | acpi_add_id(device, ACPI_POWER_HID); |
||
1131 | break; |
||
1132 | case ACPI_BUS_TYPE_PROCESSOR: |
||
1133 | acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID); |
||
1134 | break; |
||
1135 | case ACPI_BUS_TYPE_THERMAL: |
||
1136 | acpi_add_id(device, ACPI_THERMAL_HID); |
||
1137 | break; |
||
1138 | case ACPI_BUS_TYPE_POWER_BUTTON: |
||
1139 | acpi_add_id(device, ACPI_BUTTON_HID_POWERF); |
||
1140 | break; |
||
1141 | case ACPI_BUS_TYPE_SLEEP_BUTTON: |
||
1142 | acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF); |
||
1143 | break; |
||
1144 | } |
||
1145 | |||
1146 | /* |
||
1147 | * We build acpi_devices for some objects that don't have _HID or _CID, |
||
1148 | * e.g., PCI bridges and slots. Drivers can't bind to these objects, |
||
1149 | * but we do use them indirectly by traversing the acpi_device tree. |
||
1150 | * This generic ID isn't useful for driver binding, but it provides |
||
1151 | * the useful property that "every acpi_device has an ID." |
||
1152 | */ |
||
1153 | if (list_empty(&device->pnp.ids)) |
||
1154 | acpi_add_id(device, "device"); |
||
1155 | } |
||
1156 | |||
1157 | static int acpi_device_set_context(struct acpi_device *device) |
||
1158 | { |
||
1159 | acpi_status status; |
||
1160 | |||
1161 | /* |
||
1162 | * Context |
||
1163 | * ------- |
||
1164 | * Attach this 'struct acpi_device' to the ACPI object. This makes |
||
1165 | * resolutions from handle->device very efficient. Fixed hardware |
||
1166 | * devices have no handles, so we skip them. |
||
1167 | */ |
||
1168 | if (!device->handle) |
||
1169 | return 0; |
||
1170 | |||
1171 | status = acpi_attach_data(device->handle, |
||
1172 | acpi_bus_data_handler, device); |
||
1173 | if (ACPI_SUCCESS(status)) |
||
1174 | return 0; |
||
1175 | |||
1176 | printk(KERN_ERR PREFIX "Error attaching device data\n"); |
||
1177 | return -ENODEV; |
||
1178 | } |
||
1179 | |||
1180 | static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) |
||
1181 | { |
||
1182 | if (!dev) |
||
1183 | return -EINVAL; |
||
1184 | |||
1185 | dev->removal_type = ACPI_BUS_REMOVAL_EJECT; |
||
1186 | device_release_driver(&dev->dev); |
||
1187 | |||
1188 | if (!rmdevice) |
||
1189 | return 0; |
||
1190 | |||
1191 | /* |
||
1192 | * unbind _ADR-Based Devices when hot removal |
||
1193 | */ |
||
1194 | if (dev->flags.bus_address) { |
||
1195 | if ((dev->parent) && (dev->parent->ops.unbind)) |
||
1196 | dev->parent->ops.unbind(dev); |
||
1197 | } |
||
1198 | acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); |
||
1199 | |||
1200 | return 0; |
||
1201 | } |
||
1202 | |||
1203 | static int acpi_add_single_object(struct acpi_device **child, |
||
1204 | acpi_handle handle, int type, |
||
1205 | unsigned long long sta, |
||
1206 | struct acpi_bus_ops *ops) |
||
1207 | { |
||
1208 | int result; |
||
1209 | struct acpi_device *device; |
||
1210 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
||
1211 | |||
1212 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
||
1213 | if (!device) { |
||
1214 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
||
1215 | return -ENOMEM; |
||
1216 | } |
||
1217 | |||
1218 | INIT_LIST_HEAD(&device->pnp.ids); |
||
1219 | device->device_type = type; |
||
1220 | device->handle = handle; |
||
1221 | device->parent = acpi_bus_get_parent(handle); |
||
1222 | device->bus_ops = *ops; /* workround for not call .start */ |
||
1223 | STRUCT_TO_INT(device->status) = sta; |
||
1224 | |||
1225 | acpi_device_get_busid(device); |
||
1226 | |||
1227 | /* |
||
1228 | * Flags |
||
1229 | * ----- |
||
1230 | * Note that we only look for object handles -- cannot evaluate objects |
||
1231 | * until we know the device is present and properly initialized. |
||
1232 | */ |
||
1233 | result = acpi_bus_get_flags(device); |
||
1234 | if (result) |
||
1235 | goto end; |
||
1236 | |||
1237 | /* |
||
1238 | * Initialize Device |
||
1239 | * ----------------- |
||
1240 | * TBD: Synch with Core's enumeration/initialization process. |
||
1241 | */ |
||
1242 | acpi_device_set_id(device); |
||
1243 | |||
1244 | /* |
||
1245 | * Power Management |
||
1246 | * ---------------- |
||
1247 | */ |
||
1248 | if (device->flags.power_manageable) { |
||
1249 | result = acpi_bus_get_power_flags(device); |
||
1250 | if (result) |
||
1251 | goto end; |
||
1252 | } |
||
1253 | |||
1254 | /* |
||
1255 | * Wakeup device management |
||
1256 | *----------------------- |
||
1257 | */ |
||
1258 | if (device->flags.wake_capable) { |
||
1259 | result = acpi_bus_get_wakeup_device_flags(device); |
||
1260 | if (result) |
||
1261 | goto end; |
||
1262 | } |
||
1263 | |||
1264 | /* |
||
1265 | * Performance Management |
||
1266 | * ---------------------- |
||
1267 | */ |
||
1268 | if (device->flags.performance_manageable) { |
||
1269 | result = acpi_bus_get_perf_flags(device); |
||
1270 | if (result) |
||
1271 | goto end; |
||
1272 | } |
||
1273 | |||
1274 | if ((result = acpi_device_set_context(device))) |
||
1275 | goto end; |
||
1276 | |||
1277 | result = acpi_device_register(device); |
||
1278 | |||
1279 | /* |
||
1280 | * Bind _ADR-Based Devices when hot add |
||
1281 | */ |
||
1282 | if (device->flags.bus_address) { |
||
1283 | if (device->parent && device->parent->ops.bind) |
||
1284 | device->parent->ops.bind(device); |
||
1285 | } |
||
1286 | |||
1287 | end: |
||
1288 | if (!result) { |
||
1289 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
||
1290 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
||
1291 | "Adding %s [%s] parent %s\n", dev_name(&device->dev), |
||
1292 | (char *) buffer.pointer, |
||
1293 | device->parent ? dev_name(&device->parent->dev) : |
||
1294 | "(null)")); |
||
1295 | kfree(buffer.pointer); |
||
1296 | *child = device; |
||
1297 | } else |
||
1298 | acpi_device_release(&device->dev); |
||
1299 | |||
1300 | return result; |
||
1301 | } |
||
1302 | |||
1303 | #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \ |
||
1304 | ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING) |
||
1305 | |||
1306 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
||
1307 | unsigned long long *sta) |
||
1308 | { |
||
1309 | acpi_status status; |
||
1310 | acpi_object_type acpi_type; |
||
1311 | |||
1312 | status = acpi_get_type(handle, &acpi_type); |
||
1313 | if (ACPI_FAILURE(status)) |
||
1314 | return -ENODEV; |
||
1315 | |||
1316 | switch (acpi_type) { |
||
1317 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
||
1318 | case ACPI_TYPE_DEVICE: |
||
1319 | *type = ACPI_BUS_TYPE_DEVICE; |
||
1320 | status = acpi_bus_get_status_handle(handle, sta); |
||
1321 | if (ACPI_FAILURE(status)) |
||
1322 | return -ENODEV; |
||
1323 | break; |
||
1324 | case ACPI_TYPE_PROCESSOR: |
||
1325 | *type = ACPI_BUS_TYPE_PROCESSOR; |
||
1326 | status = acpi_bus_get_status_handle(handle, sta); |
||
1327 | if (ACPI_FAILURE(status)) |
||
1328 | return -ENODEV; |
||
1329 | break; |
||
1330 | case ACPI_TYPE_THERMAL: |
||
1331 | *type = ACPI_BUS_TYPE_THERMAL; |
||
1332 | *sta = ACPI_STA_DEFAULT; |
||
1333 | break; |
||
1334 | case ACPI_TYPE_POWER: |
||
1335 | *type = ACPI_BUS_TYPE_POWER; |
||
1336 | *sta = ACPI_STA_DEFAULT; |
||
1337 | break; |
||
1338 | default: |
||
1339 | return -ENODEV; |
||
1340 | } |
||
1341 | |||
1342 | return 0; |
||
1343 | } |
||
1344 | |||
1345 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, |
||
1346 | void *context, void **return_value) |
||
1347 | { |
||
1348 | struct acpi_bus_ops *ops = context; |
||
1349 | int type; |
||
1350 | unsigned long long sta; |
||
1351 | struct acpi_device *device; |
||
1352 | acpi_status status; |
||
1353 | int result; |
||
1354 | |||
1355 | result = acpi_bus_type_and_status(handle, &type, &sta); |
||
1356 | if (result) |
||
1357 | return AE_OK; |
||
1358 | |||
1359 | if (!(sta & ACPI_STA_DEVICE_PRESENT) && |
||
1360 | !(sta & ACPI_STA_DEVICE_FUNCTIONING)) |
||
1361 | return AE_CTRL_DEPTH; |
||
1362 | |||
1363 | /* |
||
1364 | * We may already have an acpi_device from a previous enumeration. If |
||
1365 | * so, we needn't add it again, but we may still have to start it. |
||
1366 | */ |
||
1367 | device = NULL; |
||
1368 | acpi_bus_get_device(handle, &device); |
||
1369 | if (ops->acpi_op_add && !device) |
||
1370 | acpi_add_single_object(&device, handle, type, sta, ops); |
||
1371 | |||
1372 | if (!device) |
||
1373 | return AE_CTRL_DEPTH; |
||
1374 | |||
1375 | if (ops->acpi_op_start && !(ops->acpi_op_add)) { |
||
1376 | status = acpi_start_single_object(device); |
||
1377 | if (ACPI_FAILURE(status)) |
||
1378 | return AE_CTRL_DEPTH; |
||
1379 | } |
||
1380 | |||
1381 | if (!*return_value) |
||
1382 | *return_value = device; |
||
1383 | return AE_OK; |
||
1384 | } |
||
1385 | |||
1386 | static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops, |
||
1387 | struct acpi_device **child) |
||
1388 | { |
||
1389 | acpi_status status; |
||
1390 | void *device = NULL; |
||
1391 | |||
1392 | status = acpi_bus_check_add(handle, 0, ops, &device); |
||
1393 | if (ACPI_SUCCESS(status)) |
||
1394 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
||
1395 | acpi_bus_check_add, NULL, ops, &device); |
||
1396 | |||
1397 | if (child) |
||
1398 | *child = device; |
||
1399 | |||
1400 | if (device) |
||
1401 | return 0; |
||
1402 | else |
||
1403 | return -ENODEV; |
||
1404 | } |
||
1405 | |||
1406 | /* |
||
1407 | * acpi_bus_add and acpi_bus_start |
||
1408 | * |
||
1409 | * scan a given ACPI tree and (probably recently hot-plugged) |
||
1410 | * create and add or starts found devices. |
||
1411 | * |
||
1412 | * If no devices were found -ENODEV is returned which does not |
||
1413 | * mean that this is a real error, there just have been no suitable |
||
1414 | * ACPI objects in the table trunk from which the kernel could create |
||
1415 | * a device and add/start an appropriate driver. |
||
1416 | */ |
||
1417 | |||
1418 | int |
||
1419 | acpi_bus_add(struct acpi_device **child, |
||
1420 | struct acpi_device *parent, acpi_handle handle, int type) |
||
1421 | { |
||
1422 | struct acpi_bus_ops ops; |
||
1423 | |||
1424 | memset(&ops, 0, sizeof(ops)); |
||
1425 | ops.acpi_op_add = 1; |
||
1426 | |||
1427 | return acpi_bus_scan(handle, &ops, child); |
||
1428 | } |
||
1429 | EXPORT_SYMBOL(acpi_bus_add); |
||
1430 | |||
1431 | int acpi_bus_start(struct acpi_device *device) |
||
1432 | { |
||
1433 | struct acpi_bus_ops ops; |
||
1434 | |||
1435 | if (!device) |
||
1436 | return -EINVAL; |
||
1437 | |||
1438 | memset(&ops, 0, sizeof(ops)); |
||
1439 | ops.acpi_op_start = 1; |
||
1440 | |||
1441 | return acpi_bus_scan(device->handle, &ops, NULL); |
||
1442 | } |
||
1443 | EXPORT_SYMBOL(acpi_bus_start); |
||
1444 | |||
1445 | int acpi_bus_trim(struct acpi_device *start, int rmdevice) |
||
1446 | { |
||
1447 | acpi_status status; |
||
1448 | struct acpi_device *parent, *child; |
||
1449 | acpi_handle phandle, chandle; |
||
1450 | acpi_object_type type; |
||
1451 | u32 level = 1; |
||
1452 | int err = 0; |
||
1453 | |||
1454 | parent = start; |
||
1455 | phandle = start->handle; |
||
1456 | child = chandle = NULL; |
||
1457 | |||
1458 | while ((level > 0) && parent && (!err)) { |
||
1459 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, |
||
1460 | chandle, &chandle); |
||
1461 | |||
1462 | /* |
||
1463 | * If this scope is exhausted then move our way back up. |
||
1464 | */ |
||
1465 | if (ACPI_FAILURE(status)) { |
||
1466 | level--; |
||
1467 | chandle = phandle; |
||
1468 | acpi_get_parent(phandle, &phandle); |
||
1469 | child = parent; |
||
1470 | parent = parent->parent; |
||
1471 | |||
1472 | if (level == 0) |
||
1473 | err = acpi_bus_remove(child, rmdevice); |
||
1474 | else |
||
1475 | err = acpi_bus_remove(child, 1); |
||
1476 | |||
1477 | continue; |
||
1478 | } |
||
1479 | |||
1480 | status = acpi_get_type(chandle, &type); |
||
1481 | if (ACPI_FAILURE(status)) { |
||
1482 | continue; |
||
1483 | } |
||
1484 | /* |
||
1485 | * If there is a device corresponding to chandle then |
||
1486 | * parse it (depth-first). |
||
1487 | */ |
||
1488 | if (acpi_bus_get_device(chandle, &child) == 0) { |
||
1489 | level++; |
||
1490 | phandle = chandle; |
||
1491 | chandle = NULL; |
||
1492 | parent = child; |
||
1493 | } |
||
1494 | continue; |
||
1495 | } |
||
1496 | return err; |
||
1497 | } |
||
1498 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
||
1499 | |||
1500 | static int acpi_bus_scan_fixed(void) |
||
1501 | { |
||
1502 | int result = 0; |
||
1503 | struct acpi_device *device = NULL; |
||
1504 | struct acpi_bus_ops ops; |
||
1505 | |||
1506 | memset(&ops, 0, sizeof(ops)); |
||
1507 | ops.acpi_op_add = 1; |
||
1508 | ops.acpi_op_start = 1; |
||
1509 | |||
1510 | /* |
||
1511 | * Enumerate all fixed-feature devices. |
||
1512 | */ |
||
1513 | if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { |
||
1514 | result = acpi_add_single_object(&device, NULL, |
||
1515 | ACPI_BUS_TYPE_POWER_BUTTON, |
||
1516 | ACPI_STA_DEFAULT, |
||
1517 | &ops); |
||
1518 | } |
||
1519 | |||
1520 | if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { |
||
1521 | result = acpi_add_single_object(&device, NULL, |
||
1522 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
||
1523 | ACPI_STA_DEFAULT, |
||
1524 | &ops); |
||
1525 | } |
||
1526 | |||
1527 | return result; |
||
1528 | } |
||
1529 | |||
1530 | int __init acpi_scan_init(void) |
||
1531 | { |
||
1532 | int result; |
||
1533 | struct acpi_bus_ops ops; |
||
1534 | |||
1535 | memset(&ops, 0, sizeof(ops)); |
||
1536 | ops.acpi_op_add = 1; |
||
1537 | ops.acpi_op_start = 1; |
||
1538 | |||
1539 | result = bus_register(&acpi_bus_type); |
||
1540 | if (result) { |
||
1541 | /* We don't want to quit even if we failed to add suspend/resume */ |
||
1542 | printk(KERN_ERR PREFIX "Could not register bus type\n"); |
||
1543 | } |
||
1544 | |||
1545 | /* |
||
1546 | * Enumerate devices in the ACPI namespace. |
||
1547 | */ |
||
1548 | result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root); |
||
1549 | |||
1550 | if (!result) |
||
1551 | result = acpi_bus_scan_fixed(); |
||
1552 | |||
1553 | if (result) |
||
1554 | acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); |
||
1555 | |||
1556 | return result; |
||
1557 | }>=>>>>=>> |