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(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
 73static const struct thermal_zone_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 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
130static int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
131
132static const struct of_device_id imx_sc_thermal_table[] = {
133	{ .compatible = "fsl,imx-sc-thermal", .data =  imx_sc_sensors },
134	{}
135};
136MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
137
138static struct platform_driver imx_sc_thermal_driver = {
139		.probe = imx_sc_thermal_probe,
140		.driver = {
141			.name = "imx-sc-thermal",
142			.of_match_table = imx_sc_thermal_table,
143		},
144};
145module_platform_driver(imx_sc_thermal_driver);
146
147MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
148MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
149MODULE_LICENSE("GPL v2");