acpi_tad.c (c13aca79ff3c4af5fd31a5b2743a90eba6e36a26) acpi_tad.c (3230b2b3c1ab5a0d3f99d5850bfdc4bf48d11cdd)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACPI Time and Alarm (TAD) Device Driver
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 *
8 * This driver is based on Section 9.18 of the ACPI 6.2 specification revision.

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47
48/* Special value for disabled timer or expired timer wake policy. */
49#define ACPI_TAD_WAKE_DISABLED (~(u32)0)
50
51struct acpi_tad_driver_data {
52 u32 capabilities;
53};
54
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACPI Time and Alarm (TAD) Device Driver
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 *
8 * This driver is based on Section 9.18 of the ACPI 6.2 specification revision.

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47
48/* Special value for disabled timer or expired timer wake policy. */
49#define ACPI_TAD_WAKE_DISABLED (~(u32)0)
50
51struct acpi_tad_driver_data {
52 u32 capabilities;
53};
54
55struct acpi_tad_rt {
56 u16 year; /* 1900 - 9999 */
57 u8 month; /* 1 - 12 */
58 u8 day; /* 1 - 31 */
59 u8 hour; /* 0 - 23 */
60 u8 minute; /* 0 - 59 */
61 u8 second; /* 0 - 59 */
62 u8 valid; /* 0 (failed) or 1 (success) for reads, 0 for writes */
63 u16 msec; /* 1 - 1000 */
64 s16 tz; /* -1440 to 1440 or 2047 (unspecified) */
65 u8 daylight;
66 u8 padding[3]; /* must be 0 */
67} __packed;
68
69static int acpi_tad_set_real_time(struct device *dev, struct acpi_tad_rt *rt)
70{
71 acpi_handle handle = ACPI_HANDLE(dev);
72 union acpi_object args[] = {
73 { .type = ACPI_TYPE_BUFFER, },
74 };
75 struct acpi_object_list arg_list = {
76 .pointer = args,
77 .count = ARRAY_SIZE(args),
78 };
79 unsigned long long retval;
80 acpi_status status;
81
82 if (rt->year < 1900 || rt->year > 9999 ||
83 rt->month < 1 || rt->month > 12 ||
84 rt->hour > 23 || rt->minute > 59 || rt->second > 59 ||
85 rt->tz < -1440 || (rt->tz > 1440 && rt->tz != 2047) ||
86 rt->daylight > 3)
87 return -ERANGE;
88
89 args[0].buffer.pointer = (u8 *)rt;
90 args[0].buffer.length = sizeof(*rt);
91
92 pm_runtime_get_sync(dev);
93
94 status = acpi_evaluate_integer(handle, "_SRT", &arg_list, &retval);
95
96 pm_runtime_put_sync(dev);
97
98 if (ACPI_FAILURE(status) || retval)
99 return -EIO;
100
101 return 0;
102}
103
104static int acpi_tad_get_real_time(struct device *dev, struct acpi_tad_rt *rt)
105{
106 acpi_handle handle = ACPI_HANDLE(dev);
107 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER };
108 union acpi_object *out_obj;
109 struct acpi_tad_rt *data;
110 acpi_status status;
111 int ret = -EIO;
112
113 pm_runtime_get_sync(dev);
114
115 status = acpi_evaluate_object(handle, "_GRT", NULL, &output);
116
117 pm_runtime_put_sync(dev);
118
119 if (ACPI_FAILURE(status))
120 goto out_free;
121
122 out_obj = output.pointer;
123 if (out_obj->type != ACPI_TYPE_BUFFER)
124 goto out_free;
125
126 if (out_obj->buffer.length != sizeof(*rt))
127 goto out_free;
128
129 data = (struct acpi_tad_rt *)(out_obj->buffer.pointer);
130 if (!data->valid)
131 goto out_free;
132
133 memcpy(rt, data, sizeof(*rt));
134 ret = 0;
135
136out_free:
137 ACPI_FREE(output.pointer);
138 return ret;
139}
140
141static char *acpi_tad_rt_next_field(char *s, int *val)
142{
143 char *p;
144
145 p = strchr(s, ':');
146 if (!p)
147 return NULL;
148
149 *p = '\0';
150 if (kstrtoint(s, 10, val))
151 return NULL;
152
153 return p + 1;
154}
155
156static ssize_t time_store(struct device *dev, struct device_attribute *attr,
157 const char *buf, size_t count)
158{
159 struct acpi_tad_rt rt;
160 char *str, *s;
161 int val, ret = -ENODATA;
162
163 str = kmemdup_nul(buf, count, GFP_KERNEL);
164 if (!str)
165 return -ENOMEM;
166
167 s = acpi_tad_rt_next_field(str, &val);
168 if (!s)
169 goto out_free;
170
171 rt.year = val;
172
173 s = acpi_tad_rt_next_field(s, &val);
174 if (!s)
175 goto out_free;
176
177 rt.month = val;
178
179 s = acpi_tad_rt_next_field(s, &val);
180 if (!s)
181 goto out_free;
182
183 rt.day = val;
184
185 s = acpi_tad_rt_next_field(s, &val);
186 if (!s)
187 goto out_free;
188
189 rt.hour = val;
190
191 s = acpi_tad_rt_next_field(s, &val);
192 if (!s)
193 goto out_free;
194
195 rt.minute = val;
196
197 s = acpi_tad_rt_next_field(s, &val);
198 if (!s)
199 goto out_free;
200
201 rt.second = val;
202
203 s = acpi_tad_rt_next_field(s, &val);
204 if (!s)
205 goto out_free;
206
207 rt.tz = val;
208
209 if (kstrtoint(s, 10, &val))
210 goto out_free;
211
212 rt.daylight = val;
213
214 rt.valid = 0;
215 rt.msec = 0;
216 memset(rt.padding, 0, 3);
217
218 ret = acpi_tad_set_real_time(dev, &rt);
219
220out_free:
221 kfree(str);
222 return ret ? ret : count;
223}
224
225static ssize_t time_show(struct device *dev, struct device_attribute *attr,
226 char *buf)
227{
228 struct acpi_tad_rt rt;
229 int ret;
230
231 ret = acpi_tad_get_real_time(dev, &rt);
232 if (ret)
233 return ret;
234
235 return sprintf(buf, "%u:%u:%u:%u:%u:%u:%d:%u\n",
236 rt.year, rt.month, rt.day, rt.hour, rt.minute, rt.second,
237 rt.tz, rt.daylight);
238}
239
240static DEVICE_ATTR(time, S_IRUSR | S_IWUSR, time_show, time_store);
241
242static struct attribute *acpi_tad_time_attrs[] = {
243 &dev_attr_time.attr,
244 NULL,
245};
246static const struct attribute_group acpi_tad_time_attr_group = {
247 .attrs = acpi_tad_time_attrs,
248};
249
55static int acpi_tad_wake_set(struct device *dev, char *method, u32 timer_id,
56 u32 value)
57{
58 acpi_handle handle = ACPI_HANDLE(dev);
59 union acpi_object args[] = {
60 { .type = ACPI_TYPE_INTEGER, },
61 { .type = ACPI_TYPE_INTEGER, },
62 };

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443 goto fail;
444
445 if (caps & ACPI_TAD_DC_WAKE) {
446 ret = sysfs_create_group(&dev->kobj, &acpi_tad_dc_attr_group);
447 if (ret)
448 goto fail;
449 }
450
250static int acpi_tad_wake_set(struct device *dev, char *method, u32 timer_id,
251 u32 value)
252{
253 acpi_handle handle = ACPI_HANDLE(dev);
254 union acpi_object args[] = {
255 { .type = ACPI_TYPE_INTEGER, },
256 { .type = ACPI_TYPE_INTEGER, },
257 };

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638 goto fail;
639
640 if (caps & ACPI_TAD_DC_WAKE) {
641 ret = sysfs_create_group(&dev->kobj, &acpi_tad_dc_attr_group);
642 if (ret)
643 goto fail;
644 }
645
646 if (caps & ACPI_TAD_RT) {
647 ret = sysfs_create_group(&dev->kobj, &acpi_tad_time_attr_group);
648 if (ret)
649 goto fail;
650 }
651
451 return 0;
452
453fail:
454 acpi_tad_remove(pdev);
455 return ret;
456}
457
458static const struct acpi_device_id acpi_tad_ids[] = {

--- 15 unchanged lines hidden --- 		652 return 0;
653
654fail:
655 acpi_tad_remove(pdev);
656 return ret;
657}
658
659static const struct acpi_device_id acpi_tad_ids[] = {

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