diff options
Diffstat (limited to 'drivers/thermal/imx_sc_thermal.c')
| -rw-r--r-- | drivers/thermal/imx_sc_thermal.c | 149 |
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"); |