summaryrefslogtreecommitdiffstats
path: root/drivers/thermal/imx_sc_thermal.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/thermal/imx_sc_thermal.c')
-rw-r--r--drivers/thermal/imx_sc_thermal.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/thermal/imx_sc_thermal.c b/drivers/thermal/imx_sc_thermal.c
new file mode 100644
index 000000000..dfadb0358
--- /dev/null
+++ b/drivers/thermal/imx_sc_thermal.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018-2020 NXP.
+ */
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+#include <linux/err.h>
+#include <linux/firmware/imx/sci.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+#include "thermal_hwmon.h"
+
+#define IMX_SC_MISC_FUNC_GET_TEMP 13
+
+static struct imx_sc_ipc *thermal_ipc_handle;
+
+struct imx_sc_sensor {
+ struct thermal_zone_device *tzd;
+ u32 resource_id;
+};
+
+struct req_get_temp {
+ u16 resource_id;
+ u8 type;
+} __packed __aligned(4);
+
+struct resp_get_temp {
+ s16 celsius;
+ s8 tenths;
+} __packed __aligned(4);
+
+struct imx_sc_msg_misc_get_temp {
+ struct imx_sc_rpc_msg hdr;
+ union {
+ struct req_get_temp req;
+ struct resp_get_temp resp;
+ } data;
+} __packed __aligned(4);
+
+static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+ struct imx_sc_msg_misc_get_temp msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ struct imx_sc_sensor *sensor = tz->devdata;
+ int ret;
+
+ msg.data.req.resource_id = sensor->resource_id;
+ msg.data.req.type = IMX_SC_C_TEMP;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_MISC;
+ hdr->func = IMX_SC_MISC_FUNC_GET_TEMP;
+ hdr->size = 2;
+
+ ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true);
+ if (ret) {
+ dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n",
+ sensor->resource_id, ret);
+ return ret;
+ }
+
+ *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100;
+
+ return 0;
+}
+
+static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
+ .get_temp = imx_sc_thermal_get_temp,
+};
+
+static int imx_sc_thermal_probe(struct platform_device *pdev)
+{
+ struct imx_sc_sensor *sensor;
+ const int *resource_id;
+ int i, ret;
+
+ ret = imx_scu_get_handle(&thermal_ipc_handle);
+ if (ret)
+ return ret;
+
+ resource_id = of_device_get_match_data(&pdev->dev);
+ if (!resource_id)
+ return -EINVAL;
+
+ for (i = 0; resource_id[i] >= 0; i++) {
+
+ sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
+ if (!sensor)
+ return -ENOMEM;
+
+ sensor->resource_id = resource_id[i];
+
+ sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
+ sensor, &imx_sc_thermal_ops);
+ if (IS_ERR(sensor->tzd)) {
+ /*
+ * Save the error value before freeing the
+ * sensor pointer, otherwise we endup with a
+ * use-after-free error
+ */
+ ret = PTR_ERR(sensor->tzd);
+
+ devm_kfree(&pdev->dev, sensor);
+
+ /*
+ * The thermal framework notifies us there is
+ * no thermal zone description for such a
+ * sensor id
+ */
+ if (ret == -ENODEV)
+ continue;
+
+ dev_err(&pdev->dev, "failed to register thermal zone\n");
+ return ret;
+ }
+
+ if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
+ dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
+ }
+
+ return 0;
+}
+
+static const int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
+
+static const struct of_device_id imx_sc_thermal_table[] = {
+ { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
+ {}
+};
+MODULE_DEVICE_TABLE(of, imx_sc_thermal_table);
+
+static struct platform_driver imx_sc_thermal_driver = {
+ .probe = imx_sc_thermal_probe,
+ .driver = {
+ .name = "imx-sc-thermal",
+ .of_match_table = imx_sc_thermal_table,
+ },
+};
+module_platform_driver(imx_sc_thermal_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller");
+MODULE_LICENSE("GPL v2");