1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * inv_mpu_acpi: ACPI processing for creating client devices
4 * Copyright (c) 2015, Intel Corporation.
5 */
6
7#ifdef CONFIG_ACPI
8
9#include <linux/kernel.h>
10#include <linux/i2c.h>
11#include <linux/dmi.h>
12#include <linux/acpi.h>
13#include "inv_mpu_iio.h"
14
15enum inv_mpu_product_name {
16 INV_MPU_NOT_MATCHED,
17 INV_MPU_ASUS_T100TA,
18};
19
20static enum inv_mpu_product_name matched_product_name;
21
22static int __init asus_t100_matched(const struct dmi_system_id *d)
23{
24 matched_product_name = INV_MPU_ASUS_T100TA;
25
26 return 0;
27}
28
29static const struct dmi_system_id inv_mpu_dev_list[] = {
30 {
31 .callback = asus_t100_matched,
32 .ident = "Asus Transformer Book T100",
33 .matches = {
34 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC"),
35 DMI_MATCH(DMI_PRODUCT_NAME, "T100TA"),
36 DMI_MATCH(DMI_PRODUCT_VERSION, "1.0"),
37 },
38 },
39 /* Add more matching tables here..*/
40 {}
41};
42
43static int asus_acpi_get_sensor_info(struct acpi_device *adev,
44 struct i2c_client *client,
45 struct i2c_board_info *info)
46{
47 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
48 int i;
49 acpi_status status;
50 union acpi_object *cpm;
51 int ret;
52
53 status = acpi_evaluate_object(object: adev->handle, pathname: "CNF0", NULL, return_object_buffer: &buffer);
54 if (ACPI_FAILURE(status))
55 return -ENODEV;
56
57 cpm = buffer.pointer;
58 for (i = 0; i < cpm->package.count; ++i) {
59 union acpi_object *elem;
60 int j;
61
62 elem = &cpm->package.elements[i];
63 for (j = 0; j < elem->package.count; ++j) {
64 union acpi_object *sub_elem;
65
66 sub_elem = &elem->package.elements[j];
67 if (sub_elem->type == ACPI_TYPE_STRING)
68 strscpy(info->type, sub_elem->string.pointer,
69 sizeof(info->type));
70 else if (sub_elem->type == ACPI_TYPE_INTEGER) {
71 if (sub_elem->integer.value != client->addr) {
72 info->addr = sub_elem->integer.value;
73 break; /* Not a MPU6500 primary */
74 }
75 }
76 }
77 }
78 ret = cpm->package.count;
79 kfree(objp: buffer.pointer);
80
81 return ret;
82}
83
84static int acpi_i2c_check_resource(struct acpi_resource *ares, void *data)
85{
86 struct acpi_resource_i2c_serialbus *sb;
87 u32 *addr = data;
88
89 if (i2c_acpi_get_i2c_resource(ares, i2c: &sb)) {
90 if (*addr)
91 *addr |= (sb->slave_address << 16);
92 else
93 *addr = sb->slave_address;
94 }
95
96 /* Tell the ACPI core that we already copied this address */
97 return 1;
98}
99
100static int inv_mpu_process_acpi_config(struct i2c_client *client,
101 unsigned short *primary_addr,
102 unsigned short *secondary_addr)
103{
104 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
105 const struct acpi_device_id *id;
106 u32 i2c_addr = 0;
107 LIST_HEAD(resources);
108 int ret;
109
110 id = acpi_match_device(ids: client->dev.driver->acpi_match_table,
111 dev: &client->dev);
112 if (!id)
113 return -ENODEV;
114
115 ret = acpi_dev_get_resources(adev, list: &resources,
116 preproc: acpi_i2c_check_resource, preproc_data: &i2c_addr);
117 if (ret < 0)
118 return ret;
119
120 acpi_dev_free_resource_list(list: &resources);
121 *primary_addr = i2c_addr & 0x0000ffff;
122 *secondary_addr = (i2c_addr & 0xffff0000) >> 16;
123
124 return 0;
125}
126
127int inv_mpu_acpi_create_mux_client(struct i2c_client *client)
128{
129 struct inv_mpu6050_state *st = iio_priv(indio_dev: dev_get_drvdata(dev: &client->dev));
130 struct acpi_device *adev = ACPI_COMPANION(&client->dev);
131
132 st->mux_client = NULL;
133 if (adev) {
134 struct i2c_board_info info;
135 struct i2c_client *mux_client;
136 int ret = -1;
137
138 memset(&info, 0, sizeof(info));
139
140 dmi_check_system(list: inv_mpu_dev_list);
141 switch (matched_product_name) {
142 case INV_MPU_ASUS_T100TA:
143 ret = asus_acpi_get_sensor_info(adev, client,
144 info: &info);
145 break;
146 /* Add more matched product processing here */
147 default:
148 break;
149 }
150
151 if (ret < 0) {
152 /* No matching DMI, so create device on INV6XX type */
153 unsigned short primary, secondary;
154
155 ret = inv_mpu_process_acpi_config(client, primary_addr: &primary,
156 secondary_addr: &secondary);
157 if (!ret && secondary) {
158 char *name;
159
160 info.addr = secondary;
161 strscpy(info.type, dev_name(&adev->dev),
162 sizeof(info.type));
163 name = strchr(info.type, ':');
164 if (name)
165 *name = '\0';
166 strlcat(p: info.type, q: "-client",
167 avail: sizeof(info.type));
168 } else
169 return 0; /* no secondary addr, which is OK */
170 }
171 mux_client = i2c_new_client_device(adap: st->muxc->adapter[0], info: &info);
172 if (IS_ERR(ptr: mux_client))
173 return PTR_ERR(ptr: mux_client);
174 st->mux_client = mux_client;
175 }
176
177 return 0;
178}
179
180void inv_mpu_acpi_delete_mux_client(struct i2c_client *client)
181{
182 struct inv_mpu6050_state *st = iio_priv(indio_dev: dev_get_drvdata(dev: &client->dev));
183
184 i2c_unregister_device(client: st->mux_client);
185}
186#else
187
188#include "inv_mpu_iio.h"
189
190int inv_mpu_acpi_create_mux_client(struct i2c_client *client)
191{
192 return 0;
193}
194
195void inv_mpu_acpi_delete_mux_client(struct i2c_client *client)
196{
197}
198#endif
199

source code of linux/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c