1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * pnpacpi -- PnP ACPI driver
4 *
5 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
6 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
7 */
8
9 #include <linux/export.h>
10 #include <linux/acpi.h>
11 #include <linux/pnp.h>
12 #include <linux/slab.h>
13 #include <linux/mod_devicetable.h>
14
15 #include "../base.h"
16 #include "pnpacpi.h"
17
18 static int num;
19
20 /*
21 * Compatible Device IDs
22 */
23 #define TEST_HEX(c) \
24 if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
25 return 0
26 #define TEST_ALPHA(c) \
27 if (!('A' <= (c) && (c) <= 'Z')) \
28 return 0
ispnpidacpi(const char * id)29 static int __init ispnpidacpi(const char *id)
30 {
31 TEST_ALPHA(id[0]);
32 TEST_ALPHA(id[1]);
33 TEST_ALPHA(id[2]);
34 TEST_HEX(id[3]);
35 TEST_HEX(id[4]);
36 TEST_HEX(id[5]);
37 TEST_HEX(id[6]);
38 if (id[7] != '\0')
39 return 0;
40 return 1;
41 }
42
pnpacpi_get_resources(struct pnp_dev * dev)43 static int pnpacpi_get_resources(struct pnp_dev *dev)
44 {
45 pnp_dbg(&dev->dev, "get resources\n");
46 return pnpacpi_parse_allocated_resource(dev);
47 }
48
pnpacpi_set_resources(struct pnp_dev * dev)49 static int pnpacpi_set_resources(struct pnp_dev *dev)
50 {
51 struct acpi_device *acpi_dev;
52 acpi_handle handle;
53 int ret = 0;
54
55 pnp_dbg(&dev->dev, "set resources\n");
56
57 acpi_dev = ACPI_COMPANION(&dev->dev);
58 if (!acpi_dev) {
59 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
60 return -ENODEV;
61 }
62
63 if (WARN_ON_ONCE(acpi_dev != dev->data))
64 dev->data = acpi_dev;
65
66 handle = acpi_dev->handle;
67 if (acpi_has_method(handle, METHOD_NAME__SRS)) {
68 struct acpi_buffer buffer;
69
70 ret = pnpacpi_build_resource_template(dev, &buffer);
71 if (ret)
72 return ret;
73
74 ret = pnpacpi_encode_resources(dev, &buffer);
75 if (!ret) {
76 acpi_status status;
77
78 status = acpi_set_current_resources(handle, &buffer);
79 if (ACPI_FAILURE(status))
80 ret = -EIO;
81 }
82 kfree(buffer.pointer);
83 }
84 if (!ret && acpi_device_power_manageable(acpi_dev))
85 ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
86
87 return ret;
88 }
89
pnpacpi_disable_resources(struct pnp_dev * dev)90 static int pnpacpi_disable_resources(struct pnp_dev *dev)
91 {
92 struct acpi_device *acpi_dev;
93 acpi_status status;
94
95 dev_dbg(&dev->dev, "disable resources\n");
96
97 acpi_dev = ACPI_COMPANION(&dev->dev);
98 if (!acpi_dev) {
99 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
100 return 0;
101 }
102
103 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
104 if (acpi_device_power_manageable(acpi_dev))
105 acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);
106
107 /* continue even if acpi_device_set_power() fails */
108 status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
109 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
110 return -ENODEV;
111
112 return 0;
113 }
114
115 #ifdef CONFIG_ACPI_SLEEP
pnpacpi_can_wakeup(struct pnp_dev * dev)116 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
117 {
118 struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
119
120 if (!acpi_dev) {
121 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
122 return false;
123 }
124
125 return acpi_bus_can_wakeup(acpi_dev->handle);
126 }
127
pnpacpi_suspend(struct pnp_dev * dev,pm_message_t state)128 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
129 {
130 struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
131 int error = 0;
132
133 if (!acpi_dev) {
134 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
135 return 0;
136 }
137
138 if (device_can_wakeup(&dev->dev)) {
139 error = acpi_pm_set_device_wakeup(&dev->dev,
140 device_may_wakeup(&dev->dev));
141 if (error)
142 return error;
143 }
144
145 if (acpi_device_power_manageable(acpi_dev)) {
146 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
147 ACPI_STATE_D3_COLD);
148 if (power_state < 0)
149 power_state = (state.event == PM_EVENT_ON) ?
150 ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
151
152 /*
153 * acpi_device_set_power() can fail (keyboard port can't be
154 * powered-down?), and in any case, our return value is ignored
155 * by pnp_bus_suspend(). Hence we don't revert the wakeup
156 * setting if the set_power fails.
157 */
158 error = acpi_device_set_power(acpi_dev, power_state);
159 }
160
161 return error;
162 }
163
pnpacpi_resume(struct pnp_dev * dev)164 static int pnpacpi_resume(struct pnp_dev *dev)
165 {
166 struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
167 int error = 0;
168
169 if (!acpi_dev) {
170 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
171 return -ENODEV;
172 }
173
174 if (device_may_wakeup(&dev->dev))
175 acpi_pm_set_device_wakeup(&dev->dev, false);
176
177 if (acpi_device_power_manageable(acpi_dev))
178 error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
179
180 return error;
181 }
182 #endif
183
184 struct pnp_protocol pnpacpi_protocol = {
185 .name = "Plug and Play ACPI",
186 .get = pnpacpi_get_resources,
187 .set = pnpacpi_set_resources,
188 .disable = pnpacpi_disable_resources,
189 #ifdef CONFIG_ACPI_SLEEP
190 .can_wakeup = pnpacpi_can_wakeup,
191 .suspend = pnpacpi_suspend,
192 .resume = pnpacpi_resume,
193 #endif
194 };
195 EXPORT_SYMBOL(pnpacpi_protocol);
196
pnpacpi_get_id(struct acpi_device * device)197 static const char *__init pnpacpi_get_id(struct acpi_device *device)
198 {
199 struct acpi_hardware_id *id;
200
201 list_for_each_entry(id, &device->pnp.ids, list) {
202 if (ispnpidacpi(id->id))
203 return id->id;
204 }
205
206 return NULL;
207 }
208
pnpacpi_add_device(struct acpi_device * device)209 static int __init pnpacpi_add_device(struct acpi_device *device)
210 {
211 struct pnp_dev *dev;
212 const char *pnpid;
213 struct acpi_hardware_id *id;
214 int error;
215
216 /* Skip devices that are already bound */
217 if (device->physical_node_count)
218 return 0;
219
220 /*
221 * If a PnPacpi device is not present , the device
222 * driver should not be loaded.
223 */
224 if (!acpi_has_method(device->handle, "_CRS"))
225 return 0;
226
227 pnpid = pnpacpi_get_id(device);
228 if (!pnpid)
229 return 0;
230
231 if (!device->status.present)
232 return 0;
233
234 dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
235 if (!dev)
236 return -ENOMEM;
237
238 ACPI_COMPANION_SET(&dev->dev, device);
239 dev->data = device;
240 /* .enabled means the device can decode the resources */
241 dev->active = device->status.enabled;
242 if (acpi_has_method(device->handle, "_SRS"))
243 dev->capabilities |= PNP_CONFIGURABLE;
244 dev->capabilities |= PNP_READ;
245 if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
246 dev->capabilities |= PNP_WRITE;
247 if (device->flags.removable)
248 dev->capabilities |= PNP_REMOVABLE;
249 if (acpi_has_method(device->handle, "_DIS"))
250 dev->capabilities |= PNP_DISABLE;
251
252 if (strlen(acpi_device_name(device)))
253 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
254 else
255 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
256
257 /* Handle possible string truncation */
258 dev->name[sizeof(dev->name) - 1] = '\0';
259
260 if (dev->active)
261 pnpacpi_parse_allocated_resource(dev);
262
263 if (dev->capabilities & PNP_CONFIGURABLE)
264 pnpacpi_parse_resource_option_data(dev);
265
266 list_for_each_entry(id, &device->pnp.ids, list) {
267 if (!strcmp(id->id, pnpid))
268 continue;
269 if (!ispnpidacpi(id->id))
270 continue;
271 pnp_add_id(dev, id->id);
272 }
273
274 /* clear out the damaged flags */
275 if (!dev->active)
276 pnp_init_resources(dev);
277
278 error = pnp_add_device(dev);
279 if (error) {
280 put_device(&dev->dev);
281 return error;
282 }
283
284 num++;
285
286 return 0;
287 }
288
pnpacpi_add_device_handler(acpi_handle handle,u32 lvl,void * context,void ** rv)289 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
290 u32 lvl, void *context,
291 void **rv)
292 {
293 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
294
295 if (!device)
296 return AE_CTRL_DEPTH;
297 if (acpi_is_pnp_device(device))
298 pnpacpi_add_device(device);
299 return AE_OK;
300 }
301
302 int pnpacpi_disabled __initdata;
pnpacpi_init(void)303 static int __init pnpacpi_init(void)
304 {
305 if (acpi_disabled || pnpacpi_disabled) {
306 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
307 return 0;
308 }
309 printk(KERN_INFO "pnp: PnP ACPI init\n");
310 pnp_register_protocol(&pnpacpi_protocol);
311 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
312 printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
313 pnp_platform_devices = 1;
314 return 0;
315 }
316
317 fs_initcall(pnpacpi_init);
318
pnpacpi_setup(char * str)319 static int __init pnpacpi_setup(char *str)
320 {
321 if (str == NULL)
322 return 1;
323 if (!strncmp(str, "off", 3))
324 pnpacpi_disabled = 1;
325 return 1;
326 }
327
328 __setup("pnpacpi=", pnpacpi_setup);
329