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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018-2020 NXP.
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/err.h>
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#include "thermal_hwmon.h"
#define IMX_SC_MISC_FUNC_GET_TEMP 13
static struct imx_sc_ipc *thermal_ipc_handle;
struct imx_sc_sensor {
struct thermal_zone_device *tzd;
u32 resource_id;
};
struct req_get_temp {
u16 resource_id;
u8 type;
} __packed __aligned(4);
struct resp_get_temp {
s16 celsius;
s8 tenths;
} __packed __aligned(4);
struct imx_sc_msg_misc_get_temp {
struct imx_sc_rpc_msg hdr;
union {
struct req_get_temp req;
struct resp_get_temp resp;
} data;
} __packed __aligned(4);
static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct imx_sc_msg_misc_get_temp msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
struct imx_sc_sensor *sensor = thermal_zone_device_priv(tz);
int ret;
msg.data.req.resource_id = sensor->resource_id;
msg.data.req.type = IMX_SC_C_TEMP;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_MISC;
hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
hdr->size = 2;
ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
if (ret)
return ret;
*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
return 0;
}
static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
.get_temp = imx_sc_thermal_get_temp,
};
static int imx_sc_thermal_probe(struct platform_device *pdev)
{
struct imx_sc_sensor *sensor;
const int *resource_id;
int i, ret;
ret = imx_scu_get_handle(&thermal_ipc_handle);
if (ret)
return ret;
resource_id = of_device_get_match_data(&pdev->dev);
if (!resource_id)
return -EINVAL;
for (i = 0; resource_id[i] >= 0; i++) {
sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
if (!sensor)
return -ENOMEM;
sensor->resource_id = resource_id[i];
sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
sensor, &imx_sc_thermal_ops);
if (IS_ERR(sensor->tzd)) {
/*
* Save the error value before freeing the
* sensor pointer, otherwise we endup with a
* use-after-free error
*/
ret = PTR_ERR(sensor->tzd);
devm_kfree(&pdev->dev, sensor);
/*
* The thermal framework notifies us there is
* no thermal zone description for such a
* sensor id
*/
if (ret == -ENODEV)
continue;
dev_err(&pdev->dev, "failed to register thermal zone\n");
return ret;
}
devm_thermal_add_hwmon_sysfs(&pdev->dev, sensor->tzd);
}
return 0;
}
static const int imx_sc_sensors[] = {
IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0,
IMX_SC_R_AP_0, IMX_SC_R_AP_1,
IMX_SC_R_GPU_0_PID0, IMX_SC_R_GPU_1_PID0,
IMX_SC_R_DRC_0, -1 };
static const struct of_device_id imx_sc_thermal_table[] = {
{ .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
{}
};
MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
static struct platform_driver imx_sc_thermal_driver = {
.probe = imx_sc_thermal_probe,
.driver = {
.name = "imx-sc-thermal",
.of_match_table = imx_sc_thermal_table,
},
};
module_platform_driver(imx_sc_thermal_driver);
MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
MODULE_LICENSE("GPL v2");
|
