1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2018-2020 NXP.
4 */
5
6#include <dt-bindings/firmware/imx/rsrc.h>
7#include <linux/err.h>
8#include <linux/firmware/imx/sci.h>
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/of_device.h>
12#include <linux/platform_device.h>
13#include <linux/slab.h>
14#include <linux/thermal.h>
15
16#include "thermal_core.h"
17#include "thermal_hwmon.h"
18
19#define IMX_SC_MISC_FUNC_GET_TEMP	13
20
21static struct imx_sc_ipc *thermal_ipc_handle;
22
23struct imx_sc_sensor {
24	struct thermal_zone_device *tzd;
25	u32 resource_id;
26};
27
28struct req_get_temp {
29	u16 resource_id;
30	u8 type;
31} __packed __aligned(4);
32
33struct resp_get_temp {
34	s16 celsius;
35	s8 tenths;
36} __packed __aligned(4);
37
38struct imx_sc_msg_misc_get_temp {
39	struct imx_sc_rpc_msg hdr;
40	union {
41		struct req_get_temp req;
42		struct resp_get_temp resp;
43	} data;
44} __packed __aligned(4);
45
46static int imx_sc_thermal_get_temp(void *data, int *temp)
47{
48	struct imx_sc_msg_misc_get_temp msg;
49	struct imx_sc_rpc_msg *hdr = &msg.hdr;
50	struct imx_sc_sensor *sensor = data;
51	int ret;
52
53	msg.data.req.resource_id = sensor->resource_id;
54	msg.data.req.type = IMX_SC_C_TEMP;
55
56	hdr->ver = IMX_SC_RPC_VERSION;
57	hdr->svc = IMX_SC_RPC_SVC_MISC;
58	hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
59	hdr->size = 2;
60
61	ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
62	if (ret) {
63		dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
64			sensor->resource_id, ret);
65		return ret;
66	}
67
68	*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
69
70	return 0;
71}
72
73static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
74	.get_temp = imx_sc_thermal_get_temp,
75};
76
77static int imx_sc_thermal_probe(struct platform_device *pdev)
78{
79	struct device_node *np, *child, *sensor_np;
80	struct imx_sc_sensor *sensor;
81	int ret;
82
83	ret = imx_scu_get_handle(&thermal_ipc_handle);
84	if (ret)
85		return ret;
86
87	np = of_find_node_by_name(NULL, "thermal-zones");
88	if (!np)
89		return -ENODEV;
90
91	sensor_np = of_node_get(pdev->dev.of_node);
92
93	for_each_available_child_of_node(np, child) {
94		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
95		if (!sensor) {
96			of_node_put(child);
97			ret = -ENOMEM;
98			goto put_node;
99		}
100
101		ret = thermal_zone_of_get_sensor_id(child,
102						    sensor_np,
103						    &sensor->resource_id);
104		if (ret < 0) {
105			dev_err(&pdev->dev,
106				"failed to get valid sensor resource id: %d\n",
107				ret);
108			of_node_put(child);
109			break;
110		}
111
112		sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
113								   sensor->resource_id,
114								   sensor,
115								   &imx_sc_thermal_ops);
116		if (IS_ERR(sensor->tzd)) {
117			dev_err(&pdev->dev, "failed to register thermal zone\n");
118			ret = PTR_ERR(sensor->tzd);
119			of_node_put(child);
120			break;
121		}
122
123		if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
124			dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
125	}
126
127put_node:
128	of_node_put(sensor_np);
129	of_node_put(np);
130
131	return ret;
132}
133
134static int imx_sc_thermal_remove(struct platform_device *pdev)
135{
136	return 0;
137}
138
139static const struct of_device_id imx_sc_thermal_table[] = {
140	{ .compatible = "fsl,imx-sc-thermal", },
141	{}
142};
143MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
144
145static struct platform_driver imx_sc_thermal_driver = {
146		.probe = imx_sc_thermal_probe,
147		.remove	= imx_sc_thermal_remove,
148		.driver = {
149			.name = "imx-sc-thermal",
150			.of_match_table = imx_sc_thermal_table,
151		},
152};
153module_platform_driver(imx_sc_thermal_driver);
154
155MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
156MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
157MODULE_LICENSE("GPL v2");
158