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(struct thermal_zone_device * tz,int * temp)46 static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, 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 = tz->devdata;
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_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 imx_sc_sensor *sensor;
80 const int *resource_id;
81 int i, ret;
82
83 ret = imx_scu_get_handle(&thermal_ipc_handle);
84 if (ret)
85 return ret;
86
87 resource_id = of_device_get_match_data(&pdev->dev);
88 if (!resource_id)
89 return -EINVAL;
90
91 for (i = 0; resource_id[i] > 0; i++) {
92
93 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
94 if (!sensor)
95 return -ENOMEM;
96
97 sensor->resource_id = resource_id[i];
98
99 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
100 sensor, &imx_sc_thermal_ops);
101 if (IS_ERR(sensor->tzd)) {
102 /*
103 * Save the error value before freeing the
104 * sensor pointer, otherwise we endup with a
105 * use-after-free error
106 */
107 ret = PTR_ERR(sensor->tzd);
108
109 devm_kfree(&pdev->dev, sensor);
110
111 /*
112 * The thermal framework notifies us there is
113 * no thermal zone description for such a
114 * sensor id
115 */
116 if (ret == -ENODEV)
117 continue;
118
119 dev_err(&pdev->dev, "failed to register thermal zone\n");
120 return ret;
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
127 return 0;
128 }
129
imx_sc_thermal_remove(struct platform_device * pdev)130 static int imx_sc_thermal_remove(struct platform_device *pdev)
131 {
132 return 0;
133 }
134
135 static int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
136
137 static const struct of_device_id imx_sc_thermal_table[] = {
138 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
139 {}
140 };
141 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
142
143 static struct platform_driver imx_sc_thermal_driver = {
144 .probe = imx_sc_thermal_probe,
145 .remove = imx_sc_thermal_remove,
146 .driver = {
147 .name = "imx-sc-thermal",
148 .of_match_table = imx_sc_thermal_table,
149 },
150 };
151 module_platform_driver(imx_sc_thermal_driver);
152
153 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
154 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
155 MODULE_LICENSE("GPL v2");
156