summaryrefslogtreecommitdiff
path: root/drivers/acpi/ac.c
blob: 2d4a35e6dd18d55c1ce1127ee81dbfd080a15653 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  acpi_ac.c - ACPI AC Adapter Driver (Revision: 27)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 */

#define pr_fmt(fmt) "ACPI: AC: " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/dmi.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/string_choices.h>
#include <linux/acpi.h>
#include <acpi/battery.h>

#define ACPI_AC_CLASS			"ac_adapter"
#define ACPI_AC_DEVICE_NAME		"AC Adapter"
#define ACPI_AC_FILE_STATE		"state"
#define ACPI_AC_NOTIFY_STATUS		0x80
#define ACPI_AC_STATUS_OFFLINE		0x00
#define ACPI_AC_STATUS_ONLINE		0x01
#define ACPI_AC_STATUS_UNKNOWN		0xFF

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI AC Adapter Driver");
MODULE_LICENSE("GPL");

static int acpi_ac_probe(struct platform_device *pdev);
static void acpi_ac_remove(struct platform_device *pdev);

static void acpi_ac_notify(acpi_handle handle, u32 event, void *data);

static const struct acpi_device_id ac_device_ids[] = {
	{"ACPI0003", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, ac_device_ids);

#ifdef CONFIG_PM_SLEEP
static int acpi_ac_resume(struct device *dev);
#endif
static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);

static int ac_sleep_before_get_state_ms;
static int ac_only;

struct acpi_ac {
	struct power_supply *charger;
	struct power_supply_desc charger_desc;
	struct acpi_device *device;
	unsigned long long state;
	struct notifier_block battery_nb;
};

#define to_acpi_ac(x) power_supply_get_drvdata(x)

/* AC Adapter Management */
static int acpi_ac_get_state(struct acpi_ac *ac)
{
	acpi_status status = AE_OK;

	if (!ac)
		return -EINVAL;

	if (ac_only) {
		ac->state = 1;
		return 0;
	}

	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
				       &ac->state);
	if (ACPI_FAILURE(status)) {
		acpi_handle_info(ac->device->handle,
				"Error reading AC Adapter state: %s\n",
				acpi_format_exception(status));
		ac->state = ACPI_AC_STATUS_UNKNOWN;
		return -ENODEV;
	}

	return 0;
}

/* sysfs I/F */
static int get_ac_property(struct power_supply *psy,
			   enum power_supply_property psp,
			   union power_supply_propval *val)
{
	struct acpi_ac *ac = to_acpi_ac(psy);

	if (!ac)
		return -ENODEV;

	if (acpi_ac_get_state(ac))
		return -ENODEV;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = ac->state;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static enum power_supply_property ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

/* Driver Model */
static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
{
	struct acpi_ac *ac = data;
	struct acpi_device *adev = ac->device;

	switch (event) {
	default:
		acpi_handle_debug(adev->handle, "Unsupported event [0x%x]\n",
				  event);
		fallthrough;
	case ACPI_AC_NOTIFY_STATUS:
	case ACPI_NOTIFY_BUS_CHECK:
	case ACPI_NOTIFY_DEVICE_CHECK:
		/*
		 * A buggy BIOS may notify AC first and then sleep for
		 * a specific time before doing actual operations in the
		 * EC event handler (_Qxx). This will cause the AC state
		 * reported by the ACPI event to be incorrect, so wait for a
		 * specific time for the EC event handler to make progress.
		 */
		if (ac_sleep_before_get_state_ms > 0)
			msleep(ac_sleep_before_get_state_ms);

		acpi_ac_get_state(ac);
		acpi_bus_generate_netlink_event(adev->pnp.device_class,
						  dev_name(&adev->dev), event,
						  (u32) ac->state);
		acpi_notifier_call_chain(adev, event, (u32) ac->state);
		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
	}
}

static int acpi_ac_battery_notify(struct notifier_block *nb,
				  unsigned long action, void *data)
{
	struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
	struct acpi_bus_event *event = (struct acpi_bus_event *)data;

	/*
	 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
	 * when adapter is plugged/unplugged. However, battery status
	 * notifications are triggered when battery starts charging or
	 * discharging. Re-reading AC status triggers lost AC notifications,
	 * if AC status has changed.
	 */
	if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
	    event->type == ACPI_BATTERY_NOTIFY_STATUS)
		acpi_ac_get_state(ac);

	return NOTIFY_OK;
}

static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
{
	ac_sleep_before_get_state_ms = 1000;
	return 0;
}

static int __init ac_only_quirk(const struct dmi_system_id *d)
{
	ac_only = 1;
	return 0;
}

/* Please keep this list alphabetically sorted */
static const struct dmi_system_id ac_dmi_table[]  __initconst = {
	{
		/* Kodlix GK45 returning incorrect state */
		.callback = ac_only_quirk,
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
		},
	},
	{
		/* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
		.callback = thinkpad_e530_quirk,
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
			DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
		},
	},
	{},
};

static int acpi_ac_probe(struct platform_device *pdev)
{
	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
	struct power_supply_config psy_cfg = {};
	struct acpi_ac *ac;
	int result;

	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
	if (!ac)
		return -ENOMEM;

	ac->device = adev;
	strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
	strcpy(acpi_device_class(adev), ACPI_AC_CLASS);

	platform_set_drvdata(pdev, ac);

	result = acpi_ac_get_state(ac);
	if (result)
		goto err_release_ac;

	psy_cfg.drv_data = ac;

	ac->charger_desc.name = acpi_device_bid(adev);
	ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
	ac->charger_desc.properties = ac_props;
	ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
	ac->charger_desc.get_property = get_ac_property;
	ac->charger = power_supply_register(&pdev->dev,
					    &ac->charger_desc, &psy_cfg);
	if (IS_ERR(ac->charger)) {
		result = PTR_ERR(ac->charger);
		goto err_release_ac;
	}

	pr_info("%s [%s] (%s-line)\n", acpi_device_name(adev),
		acpi_device_bid(adev), str_on_off(ac->state));

	ac->battery_nb.notifier_call = acpi_ac_battery_notify;
	register_acpi_notifier(&ac->battery_nb);

	result = acpi_dev_install_notify_handler(adev, ACPI_ALL_NOTIFY,
						 acpi_ac_notify, ac);
	if (result)
		goto err_unregister;

	return 0;

err_unregister:
	power_supply_unregister(ac->charger);
	unregister_acpi_notifier(&ac->battery_nb);
err_release_ac:
	kfree(ac);

	return result;
}

#ifdef CONFIG_PM_SLEEP
static int acpi_ac_resume(struct device *dev)
{
	struct acpi_ac *ac = dev_get_drvdata(dev);
	unsigned int old_state;

	old_state = ac->state;
	if (acpi_ac_get_state(ac))
		return 0;
	if (old_state != ac->state)
		kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);

	return 0;
}
#else
#define acpi_ac_resume NULL
#endif

static void acpi_ac_remove(struct platform_device *pdev)
{
	struct acpi_ac *ac = platform_get_drvdata(pdev);

	acpi_dev_remove_notify_handler(ac->device, ACPI_ALL_NOTIFY,
				       acpi_ac_notify);
	power_supply_unregister(ac->charger);
	unregister_acpi_notifier(&ac->battery_nb);

	kfree(ac);
}

static struct platform_driver acpi_ac_driver = {
	.probe = acpi_ac_probe,
	.remove_new = acpi_ac_remove,
	.driver = {
		.name = "ac",
		.acpi_match_table = ac_device_ids,
		.pm = &acpi_ac_pm,
	},
};

static int __init acpi_ac_init(void)
{
	int result;

	if (acpi_disabled)
		return -ENODEV;

	if (acpi_quirk_skip_acpi_ac_and_battery())
		return -ENODEV;

	dmi_check_system(ac_dmi_table);

	result = platform_driver_register(&acpi_ac_driver);
	if (result < 0)
		return -ENODEV;

	return 0;
}

static void __exit acpi_ac_exit(void)
{
	platform_driver_unregister(&acpi_ac_driver);
}
module_init(acpi_ac_init);
module_exit(acpi_ac_exit);