[linux-block.git] / drivers / hwmon / scmi-hwmon.c

// SPDX-License-Identifier: GPL-2.0
/*
 * System Control and Management Interface(SCMI) based hwmon sensor driver
 *
 * Copyright (C) 2018 ARM Ltd.
 * Sudeep Holla <sudeep.holla@arm.com>
 */

#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/scmi_protocol.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>

struct scmi_sensors {
	const struct scmi_handle *handle;
	const struct scmi_sensor_info **info[hwmon_max];
};

static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
			   u32 attr, int channel, long *val)
{
	int ret;
	u64 value;
	const struct scmi_sensor_info *sensor;
	struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
	const struct scmi_handle *h = scmi_sensors->handle;

	sensor = *(scmi_sensors->info[type] + channel);
	ret = h->sensor_ops->reading_get(h, sensor->id, false, &value);
	if (!ret)
		*val = value;

	return ret;
}

static int
scmi_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
		       u32 attr, int channel, const char **str)
{
	const struct scmi_sensor_info *sensor;
	struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);

	sensor = *(scmi_sensors->info[type] + channel);
	*str = sensor->name;

	return 0;
}

static umode_t
scmi_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
		      u32 attr, int channel)
{
	const struct scmi_sensor_info *sensor;
	const struct scmi_sensors *scmi_sensors = drvdata;

	sensor = *(scmi_sensors->info[type] + channel);
	if (sensor && sensor->name)
		return S_IRUGO;

	return 0;
}

static const struct hwmon_ops scmi_hwmon_ops = {
	.is_visible = scmi_hwmon_is_visible,
	.read = scmi_hwmon_read,
	.read_string = scmi_hwmon_read_string,
};

static struct hwmon_chip_info scmi_chip_info = {
	.ops = &scmi_hwmon_ops,
	.info = NULL,
};

static int scmi_hwmon_add_chan_info(struct hwmon_channel_info *scmi_hwmon_chan,
				    struct device *dev, int num,
				    enum hwmon_sensor_types type, u32 config)
{
	int i;
	u32 *cfg = devm_kcalloc(dev, num + 1, sizeof(*cfg), GFP_KERNEL);

	if (!cfg)
		return -ENOMEM;

	scmi_hwmon_chan->type = type;
	scmi_hwmon_chan->config = cfg;
	for (i = 0; i < num; i++, cfg++)
		*cfg = config;

	return 0;
}

static enum hwmon_sensor_types scmi_types[] = {
	[TEMPERATURE_C] = hwmon_temp,
	[VOLTAGE] = hwmon_in,
	[CURRENT] = hwmon_curr,
	[POWER] = hwmon_power,
	[ENERGY] = hwmon_energy,
};

static u32 hwmon_attributes[] = {
	[hwmon_chip] = HWMON_C_REGISTER_TZ,
	[hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL,
	[hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL,
	[hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL,
	[hwmon_power] = HWMON_P_INPUT | HWMON_P_LABEL,
	[hwmon_energy] = HWMON_E_INPUT | HWMON_E_LABEL,
};

static int scmi_hwmon_probe(struct scmi_device *sdev)
{
	int i, idx;
	u16 nr_sensors;
	enum hwmon_sensor_types type;
	struct scmi_sensors *scmi_sensors;
	const struct scmi_sensor_info *sensor;
	int nr_count[hwmon_max] = {0}, nr_types = 0;
	const struct hwmon_chip_info *chip_info;
	struct device *hwdev, *dev = &sdev->dev;
	struct hwmon_channel_info *scmi_hwmon_chan;
	const struct hwmon_channel_info **ptr_scmi_ci;
	const struct scmi_handle *handle = sdev->handle;

	if (!handle || !handle->sensor_ops)
		return -ENODEV;

	nr_sensors = handle->sensor_ops->count_get(handle);
	if (!nr_sensors)
		return -EIO;

	scmi_sensors = devm_kzalloc(dev, sizeof(*scmi_sensors), GFP_KERNEL);
	if (!scmi_sensors)
		return -ENOMEM;

	scmi_sensors->handle = handle;

	for (i = 0; i < nr_sensors; i++) {
		sensor = handle->sensor_ops->info_get(handle, i);
		if (!sensor)
			return -EINVAL;

		switch (sensor->type) {
		case TEMPERATURE_C:
		case VOLTAGE:
		case CURRENT:
		case POWER:
		case ENERGY:
			type = scmi_types[sensor->type];
			if (!nr_count[type])
				nr_types++;
			nr_count[type]++;
			break;
		}
	}

	if (nr_count[hwmon_temp])
		nr_count[hwmon_chip]++, nr_types++;

	scmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*scmi_hwmon_chan),
				       GFP_KERNEL);
	if (!scmi_hwmon_chan)
		return -ENOMEM;

	ptr_scmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*ptr_scmi_ci),
				   GFP_KERNEL);
	if (!ptr_scmi_ci)
		return -ENOMEM;

	scmi_chip_info.info = ptr_scmi_ci;
	chip_info = &scmi_chip_info;

	for (type = 0; type < hwmon_max; type++) {
		if (!nr_count[type])
			continue;

		scmi_hwmon_add_chan_info(scmi_hwmon_chan, dev, nr_count[type],
					 type, hwmon_attributes[type]);
		*ptr_scmi_ci++ = scmi_hwmon_chan++;

		scmi_sensors->info[type] =
			devm_kcalloc(dev, nr_count[type],
				     sizeof(*scmi_sensors->info), GFP_KERNEL);
		if (!scmi_sensors->info[type])
			return -ENOMEM;
	}

	for (i = nr_sensors - 1; i >= 0 ; i--) {
		sensor = handle->sensor_ops->info_get(handle, i);
		if (!sensor)
			continue;

		switch (sensor->type) {
		case TEMPERATURE_C:
		case VOLTAGE:
		case CURRENT:
		case POWER:
		case ENERGY:
			type = scmi_types[sensor->type];
			idx = --nr_count[type];
			*(scmi_sensors->info[type] + idx) = sensor;
			break;
		}
	}

	hwdev = devm_hwmon_device_register_with_info(dev, "scmi_sensors",
						     scmi_sensors, chip_info,
						     NULL);

	return PTR_ERR_OR_ZERO(hwdev);
}

static const struct scmi_device_id scmi_id_table[] = {
	{ SCMI_PROTOCOL_SENSOR },
	{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);

static struct scmi_driver scmi_hwmon_drv = {
	.name		= "scmi-hwmon",
	.probe		= scmi_hwmon_probe,
	.id_table	= scmi_id_table,
};
module_scmi_driver(scmi_hwmon_drv);

MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("ARM SCMI HWMON interface driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
b23688ae SH	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* System Control and Management Interface(SCMI) based hwmon sensor driver
	4	*
	5	* Copyright (C) 2018 ARM Ltd.
	6	* Sudeep Holla <sudeep.holla@arm.com>
	7	*/
	8
	9	#include <linux/hwmon.h>
	10	#include <linux/module.h>
	11	#include <linux/scmi_protocol.h>
	12	#include <linux/slab.h>
	13	#include <linux/sysfs.h>
	14	#include <linux/thermal.h>
	15
	16	struct scmi_sensors {
	17	const struct scmi_handle *handle;
	18	const struct scmi_sensor_info **info[hwmon_max];
	19	};
	20
	21	static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
	22	u32 attr, int channel, long *val)
	23	{
	24	int ret;
	25	u64 value;
	26	const struct scmi_sensor_info *sensor;
	27	struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
	28	const struct scmi_handle *h = scmi_sensors->handle;
	29
	30	sensor = *(scmi_sensors->info[type] + channel);
	31	ret = h->sensor_ops->reading_get(h, sensor->id, false, &value);
	32	if (!ret)
	33	*val = value;
	34
	35	return ret;
	36	}
	37
	38	static int
	39	scmi_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type,
	40	u32 attr, int channel, const char **str)
	41	{
	42	const struct scmi_sensor_info *sensor;
	43	struct scmi_sensors *scmi_sensors = dev_get_drvdata(dev);
	44
	45	sensor = *(scmi_sensors->info[type] + channel);
	46	*str = sensor->name;
	47
	48	return 0;
	49	}
	50
	51	static umode_t
	52	scmi_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
	53	u32 attr, int channel)
	54	{
	55	const struct scmi_sensor_info *sensor;
	56	const struct scmi_sensors *scmi_sensors = drvdata;
	57
	58	sensor = *(scmi_sensors->info[type] + channel);
	59	if (sensor && sensor->name)
	60	return S_IRUGO;
	61
	62	return 0;
	63	}
	64
65	static const struct hwmon_ops scmi_hwmon_ops = {
66	.is_visible = scmi_hwmon_is_visible,
67	.read = scmi_hwmon_read,
68	.read_string = scmi_hwmon_read_string,
69	};
70
71	static struct hwmon_chip_info scmi_chip_info = {
72	.ops = &scmi_hwmon_ops,
73	.info = NULL,
74	};
75
76	static int scmi_hwmon_add_chan_info(struct hwmon_channel_info *scmi_hwmon_chan,
77	struct device *dev, int num,
78	enum hwmon_sensor_types type, u32 config)
79	{
80	int i;
81	u32 cfg = devm_kcalloc(dev, num + 1, sizeof(cfg), GFP_KERNEL);
82
83	if (!cfg)
84	return -ENOMEM;
85
86	scmi_hwmon_chan->type = type;
87	scmi_hwmon_chan->config = cfg;
88	for (i = 0; i < num; i++, cfg++)
89	*cfg = config;
90
91	return 0;
92	}
93
94	static enum hwmon_sensor_types scmi_types[] = {
95	[TEMPERATURE_C] = hwmon_temp,
96	[VOLTAGE] = hwmon_in,
97	[CURRENT] = hwmon_curr,
98	[POWER] = hwmon_power,
99	[ENERGY] = hwmon_energy,
100	};
101
102	static u32 hwmon_attributes[] = {
103	[hwmon_chip] = HWMON_C_REGISTER_TZ,
104	[hwmon_temp] = HWMON_T_INPUT \| HWMON_T_LABEL,
105	[hwmon_in] = HWMON_I_INPUT \| HWMON_I_LABEL,
106	[hwmon_curr] = HWMON_C_INPUT \| HWMON_C_LABEL,
107	[hwmon_power] = HWMON_P_INPUT \| HWMON_P_LABEL,
108	[hwmon_energy] = HWMON_E_INPUT \| HWMON_E_LABEL,
109	};
110
111	static int scmi_hwmon_probe(struct scmi_device *sdev)
112	{
113	int i, idx;
114	u16 nr_sensors;
115	enum hwmon_sensor_types type;
116	struct scmi_sensors *scmi_sensors;
117	const struct scmi_sensor_info *sensor;
118	int nr_count[hwmon_max] = {0}, nr_types = 0;
119	const struct hwmon_chip_info *chip_info;
120	struct device hwdev, dev = &sdev->dev;
121	struct hwmon_channel_info *scmi_hwmon_chan;
122	const struct hwmon_channel_info **ptr_scmi_ci;
123	const struct scmi_handle *handle = sdev->handle;
124
125	if (!handle \|\| !handle->sensor_ops)
126	return -ENODEV;
127
128	nr_sensors = handle->sensor_ops->count_get(handle);
129	if (!nr_sensors)
130	return -EIO;
131
132	scmi_sensors = devm_kzalloc(dev, sizeof(*scmi_sensors), GFP_KERNEL);
133	if (!scmi_sensors)
134	return -ENOMEM;
135
136	scmi_sensors->handle = handle;
137
138	for (i = 0; i < nr_sensors; i++) {
139	sensor = handle->sensor_ops->info_get(handle, i);
140	if (!sensor)
c09880ce	141	return -EINVAL;
b23688ae SH	142
	143	switch (sensor->type) {
	144	case TEMPERATURE_C:
	145	case VOLTAGE:
	146	case CURRENT:
	147	case POWER:
	148	case ENERGY:
	149	type = scmi_types[sensor->type];
	150	if (!nr_count[type])
	151	nr_types++;
	152	nr_count[type]++;
	153	break;
	154	}
	155	}
	156
	157	if (nr_count[hwmon_temp])
	158	nr_count[hwmon_chip]++, nr_types++;
	159
	160	scmi_hwmon_chan = devm_kcalloc(dev, nr_types, sizeof(*scmi_hwmon_chan),
	161	GFP_KERNEL);
	162	if (!scmi_hwmon_chan)
	163	return -ENOMEM;
	164
	165	ptr_scmi_ci = devm_kcalloc(dev, nr_types + 1, sizeof(*ptr_scmi_ci),
	166	GFP_KERNEL);
	167	if (!ptr_scmi_ci)
	168	return -ENOMEM;
	169
	170	scmi_chip_info.info = ptr_scmi_ci;
	171	chip_info = &scmi_chip_info;
	172
f18a36cf SH	173	for (type = 0; type < hwmon_max; type++) {
	174	if (!nr_count[type])
	175	continue;
	176
b23688ae SH	177	scmi_hwmon_add_chan_info(scmi_hwmon_chan, dev, nr_count[type],
	178	type, hwmon_attributes[type]);
	179	*ptr_scmi_ci++ = scmi_hwmon_chan++;
	180
	181	scmi_sensors->info[type] =
	182	devm_kcalloc(dev, nr_count[type],
	183	sizeof(*scmi_sensors->info), GFP_KERNEL);
	184	if (!scmi_sensors->info[type])
	185	return -ENOMEM;
	186	}
	187
	188	for (i = nr_sensors - 1; i >= 0 ; i--) {
	189	sensor = handle->sensor_ops->info_get(handle, i);
	190	if (!sensor)
	191	continue;
	192
	193	switch (sensor->type) {
	194	case TEMPERATURE_C:
	195	case VOLTAGE:
	196	case CURRENT:
	197	case POWER:
	198	case ENERGY:
	199	type = scmi_types[sensor->type];
	200	idx = --nr_count[type];
	201	*(scmi_sensors->info[type] + idx) = sensor;
	202	break;
	203	}
	204	}
	205
	206	hwdev = devm_hwmon_device_register_with_info(dev, "scmi_sensors",
	207	scmi_sensors, chip_info,
	208	NULL);
	209
	210	return PTR_ERR_OR_ZERO(hwdev);
	211	}
	212
	213	static const struct scmi_device_id scmi_id_table[] = {
	214	{ SCMI_PROTOCOL_SENSOR },
	215	{ },
	216	};
	217	MODULE_DEVICE_TABLE(scmi, scmi_id_table);
	218
	219	static struct scmi_driver scmi_hwmon_drv = {
	220	.name = "scmi-hwmon",
	221	.probe = scmi_hwmon_probe,
	222	.id_table = scmi_id_table,
	223	};
	224	module_scmi_driver(scmi_hwmon_drv);
	225
	226	MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
	227	MODULE_DESCRIPTION("ARM SCMI HWMON interface driver");
	228	MODULE_LICENSE("GPL v2");