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
21 static struct imx_sc_ipc *thermal_ipc_handle;
22
23 struct imx_sc_sensor {
24 struct thermal_zone_device *tzd;
25 u32 resource_id;
26 };
27
28 struct req_get_temp {
29 u16 resource_id;
30 u8 type;
31 } __packed __aligned(4);
32
33 struct resp_get_temp {
34 s16 celsius;
35 s8 tenths;
36 } __packed __aligned(4);
37
38 struct 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
imx_sc_thermal_get_temp(void * data,int * temp)46 static 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
73 static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
74 .get_temp = imx_sc_thermal_get_temp,
75 };
76
imx_sc_thermal_probe(struct platform_device * pdev)77 static 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(sensor_np);
97 return -ENOMEM;
98 }
99
100 ret = thermal_zone_of_get_sensor_id(child,
101 sensor_np,
102 &sensor->resource_id);
103 if (ret < 0) {
104 dev_err(&pdev->dev,
105 "failed to get valid sensor resource id: %d\n",
106 ret);
107 break;
108 }
109
110 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
111 sensor->resource_id,
112 sensor,
113 &imx_sc_thermal_ops);
114 if (IS_ERR(sensor->tzd)) {
115 dev_err(&pdev->dev, "failed to register thermal zone\n");
116 ret = PTR_ERR(sensor->tzd);
117 break;
118 }
119
120 if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
121 dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
122 }
123
124 of_node_put(sensor_np);
125
126 return ret;
127 }
128
imx_sc_thermal_remove(struct platform_device * pdev)129 static int imx_sc_thermal_remove(struct platform_device *pdev)
130 {
131 return 0;
132 }
133
134 static const struct of_device_id imx_sc_thermal_table[] = {
135 { .compatible = "fsl,imx-sc-thermal", },
136 {}
137 };
138 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
139
140 static struct platform_driver imx_sc_thermal_driver = {
141 .probe = imx_sc_thermal_probe,
142 .remove = imx_sc_thermal_remove,
143 .driver = {
144 .name = "imx-sc-thermal",
145 .of_match_table = imx_sc_thermal_table,
146 },
147 };
148 module_platform_driver(imx_sc_thermal_driver);
149
150 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
151 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
152 MODULE_LICENSE("GPL v2");
153
