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
|
// SPDX-License-Identifier: GPL-2.0
/* Author: Dan Scally <djrscally@gmail.com> */
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps68470.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include "intel_skl_int3472_common.h"
#define DESIGNED_FOR_CHROMEOS 1
#define DESIGNED_FOR_WINDOWS 2
static const struct mfd_cell tps68470_cros[] = {
{ .name = "tps68470-gpio" },
{ .name = "tps68470_pmic_opregion" },
};
static const struct mfd_cell tps68470_win[] = {
{ .name = "tps68470-gpio" },
{ .name = "tps68470-clk" },
{ .name = "tps68470-regulator" },
};
static const struct regmap_config tps68470_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TPS68470_REG_MAX,
};
static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
{
unsigned int version;
int ret;
/* Force software reset */
ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
if (ret)
return ret;
ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
if (ret) {
dev_err(dev, "Failed to read revision register: %d\n", ret);
return ret;
}
dev_info(dev, "TPS68470 REVID: 0x%02x\n", version);
return 0;
}
/** skl_int3472_tps68470_calc_type: Check what platform a device is designed for
* @adev: A pointer to a &struct acpi_device
*
* Check CLDB buffer against the PMIC's adev. If present, then we check
* the value of control_logic_type field and follow one of the
* following scenarios:
*
* 1. No CLDB - likely ACPI tables designed for ChromeOS. We
* create platform devices for the GPIOs and OpRegion drivers.
*
* 2. CLDB, with control_logic_type = 2 - probably ACPI tables
* made for Windows 2-in-1 platforms. Register pdevs for GPIO,
* Clock and Regulator drivers to bind to.
*
* 3. Any other value in control_logic_type, we should never have
* gotten to this point; fail probe and return.
*
* Return:
* * 1 Device intended for ChromeOS
* * 2 Device intended for Windows
* * -EINVAL Where @adev has an object named CLDB but it does not conform to
* our expectations
*/
static int skl_int3472_tps68470_calc_type(struct acpi_device *adev)
{
struct int3472_cldb cldb = { 0 };
int ret;
/*
* A CLDB buffer that exists, but which does not match our expectations
* should trigger an error so we don't blindly continue.
*/
ret = skl_int3472_fill_cldb(adev, &cldb);
if (ret && ret != -ENODEV)
return ret;
if (ret)
return DESIGNED_FOR_CHROMEOS;
if (cldb.control_logic_type != 2)
return -EINVAL;
return DESIGNED_FOR_WINDOWS;
}
int skl_int3472_tps68470_probe(struct i2c_client *client)
{
struct acpi_device *adev = ACPI_COMPANION(&client->dev);
struct regmap *regmap;
int device_type;
int ret;
regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Failed to create regmap: %ld\n", PTR_ERR(regmap));
return PTR_ERR(regmap);
}
i2c_set_clientdata(client, regmap);
ret = tps68470_chip_init(&client->dev, regmap);
if (ret < 0) {
dev_err(&client->dev, "TPS68470 init error %d\n", ret);
return ret;
}
device_type = skl_int3472_tps68470_calc_type(adev);
switch (device_type) {
case DESIGNED_FOR_WINDOWS:
ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
tps68470_win, ARRAY_SIZE(tps68470_win),
NULL, 0, NULL);
break;
case DESIGNED_FOR_CHROMEOS:
ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
tps68470_cros, ARRAY_SIZE(tps68470_cros),
NULL, 0, NULL);
break;
default:
dev_err(&client->dev, "Failed to add MFD devices\n");
return device_type;
}
return ret;
}
|
