158 строки
3.5 KiB
C
158 строки
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2018-2020 NXP.
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*/
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#include <dt-bindings/firmware/imx/rsrc.h>
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#include <linux/err.h>
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#include <linux/firmware/imx/sci.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#include "thermal_core.h"
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#include "thermal_hwmon.h"
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#define IMX_SC_MISC_FUNC_GET_TEMP 13
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static struct imx_sc_ipc *thermal_ipc_handle;
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struct imx_sc_sensor {
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struct thermal_zone_device *tzd;
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u32 resource_id;
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};
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struct req_get_temp {
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u16 resource_id;
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u8 type;
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} __packed __aligned(4);
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struct resp_get_temp {
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s16 celsius;
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s8 tenths;
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} __packed __aligned(4);
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struct imx_sc_msg_misc_get_temp {
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struct imx_sc_rpc_msg hdr;
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union {
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struct req_get_temp req;
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struct resp_get_temp resp;
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} data;
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} __packed __aligned(4);
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static int imx_sc_thermal_get_temp(void *data, int *temp)
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{
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struct imx_sc_msg_misc_get_temp msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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struct imx_sc_sensor *sensor = data;
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int ret;
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msg.data.req.resource_id = sensor->resource_id;
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msg.data.req.type = IMX_SC_C_TEMP;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_MISC;
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hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
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hdr->size = 2;
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ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
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if (ret) {
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dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
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sensor->resource_id, ret);
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return ret;
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}
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*temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
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return 0;
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}
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static const struct thermal_zone_of_device_ops imx_sc_thermal_ops = {
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.get_temp = imx_sc_thermal_get_temp,
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};
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static int imx_sc_thermal_probe(struct platform_device *pdev)
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{
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struct device_node *np, *child, *sensor_np;
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struct imx_sc_sensor *sensor;
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int ret;
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ret = imx_scu_get_handle(&thermal_ipc_handle);
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if (ret)
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return ret;
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np = of_find_node_by_name(NULL, "thermal-zones");
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if (!np)
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return -ENODEV;
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sensor_np = of_node_get(pdev->dev.of_node);
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for_each_available_child_of_node(np, child) {
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sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
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if (!sensor) {
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of_node_put(child);
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ret = -ENOMEM;
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goto put_node;
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}
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ret = thermal_zone_of_get_sensor_id(child,
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sensor_np,
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&sensor->resource_id);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to get valid sensor resource id: %d\n",
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ret);
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of_node_put(child);
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break;
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}
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sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
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sensor->resource_id,
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sensor,
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&imx_sc_thermal_ops);
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if (IS_ERR(sensor->tzd)) {
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dev_err(&pdev->dev, "failed to register thermal zone\n");
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ret = PTR_ERR(sensor->tzd);
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of_node_put(child);
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break;
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}
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if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
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dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
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}
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put_node:
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of_node_put(sensor_np);
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of_node_put(np);
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return ret;
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}
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static int imx_sc_thermal_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static const struct of_device_id imx_sc_thermal_table[] = {
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{ .compatible = "fsl,imx-sc-thermal", },
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{}
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};
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MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
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static struct platform_driver imx_sc_thermal_driver = {
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.probe = imx_sc_thermal_probe,
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.remove = imx_sc_thermal_remove,
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.driver = {
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.name = "imx-sc-thermal",
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.of_match_table = imx_sc_thermal_table,
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},
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};
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module_platform_driver(imx_sc_thermal_driver);
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MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
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MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
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MODULE_LICENSE("GPL v2");
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