summaryrefslogtreecommitdiff
path: root/sound/soc/soc-acpi.c
blob: 6d693b2ad5a35bee0a41b9709e40edb40a0392f5 (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
// SPDX-License-Identifier: GPL-2.0
//
// soc-apci.c - support for ACPI enumeration.
//
// Copyright (c) 2013-15, Intel Corporation.

#include <linux/export.h>
#include <linux/module.h>
#include <sound/soc-acpi.h>

static bool snd_soc_acpi_id_present(struct snd_soc_acpi_mach *machine)
{
	const struct snd_soc_acpi_codecs *comp_ids = machine->comp_ids;
	int i;

	if (machine->id[0]) {
		if (acpi_dev_present(machine->id, NULL, -1))
			return true;
	}

	if (comp_ids) {
		for (i = 0; i < comp_ids->num_codecs; i++) {
			if (acpi_dev_present(comp_ids->codecs[i], NULL, -1)) {
				strscpy(machine->id, comp_ids->codecs[i], ACPI_ID_LEN);
				return true;
			}
		}
	}

	return false;
}

struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
{
	struct snd_soc_acpi_mach *mach;
	struct snd_soc_acpi_mach *mach_alt;

	for (mach = machines; mach->id[0] || mach->comp_ids; mach++) {
		if (snd_soc_acpi_id_present(mach)) {
			if (mach->machine_quirk) {
				mach_alt = mach->machine_quirk(mach);
				if (!mach_alt)
					continue; /* not full match, ignore */
				mach = mach_alt;
			}

			return mach;
		}
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);

static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
					     void *context, void **ret)
{
	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
	acpi_status status;
	struct snd_soc_acpi_package_context *pkg_ctx = context;

	pkg_ctx->data_valid = false;

	if (adev && adev->status.present && adev->status.functional) {
		struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
		union acpi_object  *myobj = NULL;

		status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
						NULL, &buffer,
						ACPI_TYPE_PACKAGE);
		if (ACPI_FAILURE(status))
			return AE_OK;

		myobj = buffer.pointer;
		if (!myobj || myobj->package.count != pkg_ctx->length) {
			kfree(buffer.pointer);
			return AE_OK;
		}

		status = acpi_extract_package(myobj,
					pkg_ctx->format, pkg_ctx->state);
		if (ACPI_FAILURE(status)) {
			kfree(buffer.pointer);
			return AE_OK;
		}

		kfree(buffer.pointer);
		pkg_ctx->data_valid = true;
		return AE_CTRL_TERMINATE;
	}

	return AE_OK;
}

bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
				struct snd_soc_acpi_package_context *ctx)
{
	acpi_status status;

	status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);

	if (ACPI_FAILURE(status) || !ctx->data_valid)
		return false;

	return true;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);

struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
{
	struct snd_soc_acpi_mach *mach = arg;
	struct snd_soc_acpi_codecs *codec_list =
		(struct snd_soc_acpi_codecs *) mach->quirk_data;
	int i;

	if (mach->quirk_data == NULL)
		return mach;

	for (i = 0; i < codec_list->num_codecs; i++) {
		if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
			return NULL;
	}

	return mach;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);

#define SDW_CODEC_ADR_MASK(_adr) ((_adr) & (SDW_DISCO_LINK_ID_MASK | SDW_VERSION_MASK | \
				  SDW_MFG_ID_MASK | SDW_PART_ID_MASK))

/* Check if all Slaves defined on the link can be found */
bool snd_soc_acpi_sdw_link_slaves_found(struct device *dev,
					const struct snd_soc_acpi_link_adr *link,
					struct sdw_extended_slave_id *ids,
					int num_slaves)
{
	unsigned int part_id, link_id, unique_id, mfg_id, version;
	int i, j, k;

	for (i = 0; i < link->num_adr; i++) {
		u64 adr = link->adr_d[i].adr;
		int reported_part_count = 0;

		mfg_id = SDW_MFG_ID(adr);
		part_id = SDW_PART_ID(adr);
		link_id = SDW_DISCO_LINK_ID(adr);
		version = SDW_VERSION(adr);

		for (j = 0; j < num_slaves; j++) {
			/* find out how many identical parts were reported on that link */
			if (ids[j].link_id == link_id &&
			    ids[j].id.part_id == part_id &&
			    ids[j].id.mfg_id == mfg_id &&
			    ids[j].id.sdw_version == version)
				reported_part_count++;
		}

		for (j = 0; j < num_slaves; j++) {
			int expected_part_count = 0;

			if (ids[j].link_id != link_id ||
			    ids[j].id.part_id != part_id ||
			    ids[j].id.mfg_id != mfg_id ||
			    ids[j].id.sdw_version != version)
				continue;

			/* find out how many identical parts are expected */
			for (k = 0; k < link->num_adr; k++) {
				u64 adr2 = link->adr_d[k].adr;

				if (SDW_CODEC_ADR_MASK(adr2) == SDW_CODEC_ADR_MASK(adr))
					expected_part_count++;
			}

			if (reported_part_count == expected_part_count) {
				/*
				 * we have to check unique id
				 * if there is more than one
				 * Slave on the link
				 */
				unique_id = SDW_UNIQUE_ID(adr);
				if (reported_part_count == 1 ||
				    ids[j].id.unique_id == unique_id) {
					dev_dbg(dev, "found part_id %#x at link %d\n", part_id, link_id);
					break;
				}
			} else {
				dev_dbg(dev, "part_id %#x reported %d expected %d on link %d, skipping\n",
					part_id, reported_part_count, expected_part_count, link_id);
			}
		}
		if (j == num_slaves) {
			dev_dbg(dev, "Slave part_id %#x not found\n", part_id);
			return false;
		}
	}
	return true;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_sdw_link_slaves_found);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ALSA SoC ACPI module");