[linux-block.git] / drivers / thermal / imx_sc_thermal.c

// 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 int imx_sc_thermal_remove(struct platform_device *pdev)
{
	return 0;
}

static 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,
		.remove	= imx_sc_thermal_remove,
		.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");
Commit	Line	Data
e20db70d AH	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright 2018-2020 NXP.
	4	*/
	5
755a7397	6	#include <dt-bindings/firmware/imx/rsrc.h>
e20db70d AH	7	#include <linux/err.h>
e20db70d AH	8	#include <linux/firmware/imx/sci.h>
e20db70d AH	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"
d2bc4dd9	17	#include "thermal_hwmon.h"
e20db70d AH	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;
1fd213f3	31	} __packed __aligned(4);
e20db70d AH	32
e20db70d AH	33	struct resp_get_temp {
968ea0df AH	34	s16 celsius;
968ea0df AH	35	s8 tenths;
1fd213f3	36	} __packed __aligned(4);
e20db70d AH	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;
1fd213f3	44	} __packed __aligned(4);
e20db70d	45
32fb9a8a	46	static int imx_sc_thermal_get_temp(struct thermal_zone_device tz, int temp)
e20db70d AH	47	{
	48	struct imx_sc_msg_misc_get_temp msg;
	49	struct imx_sc_rpc_msg *hdr = &msg.hdr;
32fb9a8a	50	struct imx_sc_sensor *sensor = tz->devdata;
e20db70d AH	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
32fb9a8a	73	static const struct thermal_zone_device_ops imx_sc_thermal_ops = {
e20db70d AH	74	.get_temp = imx_sc_thermal_get_temp,
	75	};
	76
	77	static int imx_sc_thermal_probe(struct platform_device *pdev)
	78	{
e20db70d	79	struct imx_sc_sensor *sensor;
31fd4b9d DL	80	const int *resource_id;
31fd4b9d DL	81	int i, ret;
e20db70d AH	82
	83	ret = imx_scu_get_handle(&thermal_ipc_handle);
	84	if (ret)
	85	return ret;
	86
31fd4b9d DL	87	resource_id = of_device_get_match_data(&pdev->dev);
	88	if (!resource_id)
	89	return -EINVAL;
e20db70d	90
31fd4b9d	91	for (i = 0; resource_id[i] > 0; i++) {
e20db70d	92
e20db70d	93	sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
31fd4b9d DL	94	if (!sensor)
31fd4b9d DL	95	return -ENOMEM;
e20db70d	96
31fd4b9d	97	sensor->resource_id = resource_id[i];
e20db70d	98
31fd4b9d DL	99	sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id,
31fd4b9d DL	100	sensor, &imx_sc_thermal_ops);
e20db70d	101	if (IS_ERR(sensor->tzd)) {
31fd4b9d DL	102	/*
	103	* Save the error value before freeing the
	104	* sensor pointer, otherwise we endup with a
	105	* use-after-free error
	106	*/
e20db70d	107	ret = PTR_ERR(sensor->tzd);
31fd4b9d DL	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;
e20db70d	121	}
d2bc4dd9 AH	122
	123	if (devm_thermal_add_hwmon_sysfs(sensor->tzd))
	124	dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
e20db70d AH	125	}
e20db70d AH	126
31fd4b9d	127	return 0;
e20db70d AH	128	}
	129
	130	static int imx_sc_thermal_remove(struct platform_device *pdev)
	131	{
	132	return 0;
	133	}
	134
31fd4b9d DL	135	static int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 };
31fd4b9d DL	136
e20db70d	137	static const struct of_device_id imx_sc_thermal_table[] = {
31fd4b9d	138	{ .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors },
e20db70d AH	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");