[linux.git] / drivers / hwmon / menf21bmc_hwmon.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  MEN 14F021P00 Board Management Controller (BMC) hwmon driver.
 *
 *  This is the core hwmon driver of the MEN 14F021P00 BMC.
 *  The BMC monitors the board voltages which can be access with this
 *  driver through sysfs.
 *
 *  Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>

#define DRV_NAME  "menf21bmc_hwmon"

#define BMC_VOLT_COUNT	5
#define MENF21BMC_V33	0
#define MENF21BMC_V5	1
#define MENF21BMC_V12	2
#define MENF21BMC_V5_SB	3
#define MENF21BMC_VBAT	4

#define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)
#define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)
#define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)

struct menf21bmc_hwmon {
	bool valid;
	struct i2c_client *i2c_client;
	unsigned long last_update;
	int in_val[BMC_VOLT_COUNT];
	int in_min[BMC_VOLT_COUNT];
	int in_max[BMC_VOLT_COUNT];
};

static const char *const input_names[] = {
	[MENF21BMC_V33]		= "MON_3_3V",
	[MENF21BMC_V5]		= "MON_5V",
	[MENF21BMC_V12]		= "MON_12V",
	[MENF21BMC_V5_SB]	= "5V_STANDBY",
	[MENF21BMC_VBAT]	= "VBAT"
};

static struct menf21bmc_hwmon *menf21bmc_hwmon_update(struct device *dev)
{
	int i;
	int val;
	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
	struct menf21bmc_hwmon *data_ret = drv_data;

	if (time_after(jiffies, drv_data->last_update + HZ)
	    || !drv_data->valid) {
		for (i = 0; i < BMC_VOLT_COUNT; i++) {
			val = i2c_smbus_read_word_data(drv_data->i2c_client,
						       IDX_TO_VOLT_INP_CMD(i));
			if (val < 0) {
				data_ret = ERR_PTR(val);
				goto abort;
			}
			drv_data->in_val[i] = val;
		}
		drv_data->last_update = jiffies;
		drv_data->valid = true;
	}
abort:
	return data_ret;
}

static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)
{
	int i, val;

	for (i = 0; i < BMC_VOLT_COUNT; i++) {
		val = i2c_smbus_read_word_data(drv_data->i2c_client,
					       IDX_TO_VOLT_MIN_CMD(i));
		if (val < 0)
			return val;

		drv_data->in_min[i] = val;

		val = i2c_smbus_read_word_data(drv_data->i2c_client,
					       IDX_TO_VOLT_MAX_CMD(i));
		if (val < 0)
			return val;

		drv_data->in_max[i] = val;
	}
	return 0;
}

static ssize_t
label_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "%s\n", input_names[attr->index]);
}

static ssize_t
in_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);

	if (IS_ERR(drv_data))
		return PTR_ERR(drv_data);

	return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);
}

static ssize_t
min_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);
}

static ssize_t
max_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);

	return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);
}

static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
static SENSOR_DEVICE_ATTR_RO(in0_min, min, 0);
static SENSOR_DEVICE_ATTR_RO(in0_max, max, 0);
static SENSOR_DEVICE_ATTR_RO(in0_label, label, 0);
static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
static SENSOR_DEVICE_ATTR_RO(in1_min, min, 1);
static SENSOR_DEVICE_ATTR_RO(in1_max, max, 1);
static SENSOR_DEVICE_ATTR_RO(in1_label, label, 1);
static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
static SENSOR_DEVICE_ATTR_RO(in2_min, min, 2);
static SENSOR_DEVICE_ATTR_RO(in2_max, max, 2);
static SENSOR_DEVICE_ATTR_RO(in2_label, label, 2);
static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
static SENSOR_DEVICE_ATTR_RO(in3_min, min, 3);
static SENSOR_DEVICE_ATTR_RO(in3_max, max, 3);
static SENSOR_DEVICE_ATTR_RO(in3_label, label, 3);
static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
static SENSOR_DEVICE_ATTR_RO(in4_min, min, 4);
static SENSOR_DEVICE_ATTR_RO(in4_max, max, 4);
static SENSOR_DEVICE_ATTR_RO(in4_label, label, 4);

static struct attribute *menf21bmc_hwmon_attrs[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in0_label.dev_attr.attr,

	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in1_label.dev_attr.attr,

	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in2_label.dev_attr.attr,

	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in3_label.dev_attr.attr,

	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in4_label.dev_attr.attr,
	NULL
};

ATTRIBUTE_GROUPS(menf21bmc_hwmon);

static int menf21bmc_hwmon_probe(struct platform_device *pdev)
{
	int ret;
	struct menf21bmc_hwmon *drv_data;
	struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
	struct device *hwmon_dev;

	drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),
				GFP_KERNEL);
	if (!drv_data)
		return -ENOMEM;

	drv_data->i2c_client = i2c_client;

	ret = menf21bmc_hwmon_get_volt_limits(drv_data);
	if (ret) {
		dev_err(&pdev->dev, "failed to read sensor limits");
		return ret;
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
						   "menf21bmc", drv_data,
						   menf21bmc_hwmon_groups);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");

	return 0;
}

static struct platform_driver menf21bmc_hwmon = {
	.probe		= menf21bmc_hwmon_probe,
	.driver		= {
		.name		= DRV_NAME,
	},
};

module_platform_driver(menf21bmc_hwmon);

MODULE_AUTHOR("Andreas Werner <[email protected]>");
MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:menf21bmc_hwmon");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
96435693 AW	2	/*
	3	* MEN 14F021P00 Board Management Controller (BMC) hwmon driver.
	4	*
	5	* This is the core hwmon driver of the MEN 14F021P00 BMC.
	6	* The BMC monitors the board voltages which can be access with this
	7	* driver through sysfs.
	8	*
	9	* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
96435693 AW	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/hwmon.h>
	16	#include <linux/hwmon-sysfs.h>
	17	#include <linux/jiffies.h>
	18	#include <linux/slab.h>
	19	#include <linux/i2c.h>
3d596047	20	#include <linux/err.h>
96435693 AW	21
	22	#define DRV_NAME "menf21bmc_hwmon"
	23
	24	#define BMC_VOLT_COUNT 5
	25	#define MENF21BMC_V33 0
	26	#define MENF21BMC_V5 1
	27	#define MENF21BMC_V12 2
	28	#define MENF21BMC_V5_SB 3
	29	#define MENF21BMC_VBAT 4
	30
	31	#define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)
	32	#define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)
	33	#define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)
	34
	35	struct menf21bmc_hwmon {
	36	bool valid;
	37	struct i2c_client *i2c_client;
	38	unsigned long last_update;
	39	int in_val[BMC_VOLT_COUNT];
	40	int in_min[BMC_VOLT_COUNT];
	41	int in_max[BMC_VOLT_COUNT];
	42	};
	43
	44	static const char *const input_names[] = {
	45	[MENF21BMC_V33] = "MON_3_3V",
	46	[MENF21BMC_V5] = "MON_5V",
	47	[MENF21BMC_V12] = "MON_12V",
	48	[MENF21BMC_V5_SB] = "5V_STANDBY",
	49	[MENF21BMC_VBAT] = "VBAT"
	50	};
	51
	52	static struct menf21bmc_hwmon menf21bmc_hwmon_update(struct device dev)
	53	{
	54	int i;
	55	int val;
	56	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
	57	struct menf21bmc_hwmon *data_ret = drv_data;
	58
	59	if (time_after(jiffies, drv_data->last_update + HZ)
	60	\|\| !drv_data->valid) {
	61	for (i = 0; i < BMC_VOLT_COUNT; i++) {
	62	val = i2c_smbus_read_word_data(drv_data->i2c_client,
	63	IDX_TO_VOLT_INP_CMD(i));
	64	if (val < 0) {
	65	data_ret = ERR_PTR(val);
	66	goto abort;
	67	}
	68	drv_data->in_val[i] = val;
	69	}
	70	drv_data->last_update = jiffies;
	71	drv_data->valid = true;
	72	}
	73	abort:
	74	return data_ret;
	75	}
	76
	77	static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)
	78	{
	79	int i, val;
	80
	81	for (i = 0; i < BMC_VOLT_COUNT; i++) {
	82	val = i2c_smbus_read_word_data(drv_data->i2c_client,
	83	IDX_TO_VOLT_MIN_CMD(i));
	84	if (val < 0)
85	return val;
86
87	drv_data->in_min[i] = val;
88
89	val = i2c_smbus_read_word_data(drv_data->i2c_client,
90	IDX_TO_VOLT_MAX_CMD(i));
91	if (val < 0)
92	return val;
93
94	drv_data->in_max[i] = val;
95	}
96	return 0;
97	}
98
99	static ssize_t
24f9ec1f	100	label_show(struct device dev, struct device_attribute devattr, char *buf)
96435693 AW	101	{
	102	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	103
	104	return sprintf(buf, "%s\n", input_names[attr->index]);
	105	}
	106
	107	static ssize_t
24f9ec1f	108	in_show(struct device dev, struct device_attribute devattr, char *buf)
96435693 AW	109	{
	110	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	111	struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);
	112
	113	if (IS_ERR(drv_data))
	114	return PTR_ERR(drv_data);
	115
	116	return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);
	117	}
	118
	119	static ssize_t
24f9ec1f	120	min_show(struct device dev, struct device_attribute devattr, char *buf)
96435693 AW	121	{
	122	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	123	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
	124
	125	return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);
	126	}
	127
	128	static ssize_t
24f9ec1f	129	max_show(struct device dev, struct device_attribute devattr, char *buf)
96435693 AW	130	{
	131	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	132	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
	133
	134	return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);
	135	}
	136
24f9ec1f GR	137	static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
	138	static SENSOR_DEVICE_ATTR_RO(in0_min, min, 0);
	139	static SENSOR_DEVICE_ATTR_RO(in0_max, max, 0);
	140	static SENSOR_DEVICE_ATTR_RO(in0_label, label, 0);
	141	static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
	142	static SENSOR_DEVICE_ATTR_RO(in1_min, min, 1);
	143	static SENSOR_DEVICE_ATTR_RO(in1_max, max, 1);
	144	static SENSOR_DEVICE_ATTR_RO(in1_label, label, 1);
	145	static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
	146	static SENSOR_DEVICE_ATTR_RO(in2_min, min, 2);
	147	static SENSOR_DEVICE_ATTR_RO(in2_max, max, 2);
	148	static SENSOR_DEVICE_ATTR_RO(in2_label, label, 2);
	149	static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
	150	static SENSOR_DEVICE_ATTR_RO(in3_min, min, 3);
	151	static SENSOR_DEVICE_ATTR_RO(in3_max, max, 3);
	152	static SENSOR_DEVICE_ATTR_RO(in3_label, label, 3);
	153	static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
	154	static SENSOR_DEVICE_ATTR_RO(in4_min, min, 4);
	155	static SENSOR_DEVICE_ATTR_RO(in4_max, max, 4);
	156	static SENSOR_DEVICE_ATTR_RO(in4_label, label, 4);
96435693 AW	157
	158	static struct attribute *menf21bmc_hwmon_attrs[] = {
	159	&sensor_dev_attr_in0_input.dev_attr.attr,
	160	&sensor_dev_attr_in0_min.dev_attr.attr,
	161	&sensor_dev_attr_in0_max.dev_attr.attr,
	162	&sensor_dev_attr_in0_label.dev_attr.attr,
	163
	164	&sensor_dev_attr_in1_input.dev_attr.attr,
	165	&sensor_dev_attr_in1_min.dev_attr.attr,
	166	&sensor_dev_attr_in1_max.dev_attr.attr,
	167	&sensor_dev_attr_in1_label.dev_attr.attr,
	168
	169	&sensor_dev_attr_in2_input.dev_attr.attr,
	170	&sensor_dev_attr_in2_min.dev_attr.attr,
	171	&sensor_dev_attr_in2_max.dev_attr.attr,
	172	&sensor_dev_attr_in2_label.dev_attr.attr,
	173
	174	&sensor_dev_attr_in3_input.dev_attr.attr,
	175	&sensor_dev_attr_in3_min.dev_attr.attr,
	176	&sensor_dev_attr_in3_max.dev_attr.attr,
	177	&sensor_dev_attr_in3_label.dev_attr.attr,
	178
	179	&sensor_dev_attr_in4_input.dev_attr.attr,
	180	&sensor_dev_attr_in4_min.dev_attr.attr,
	181	&sensor_dev_attr_in4_max.dev_attr.attr,
	182	&sensor_dev_attr_in4_label.dev_attr.attr,
	183	NULL
	184	};
	185
	186	ATTRIBUTE_GROUPS(menf21bmc_hwmon);
	187
	188	static int menf21bmc_hwmon_probe(struct platform_device *pdev)
	189	{
	190	int ret;
	191	struct menf21bmc_hwmon *drv_data;
	192	struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
	193	struct device *hwmon_dev;
	194
	195	drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),
	196	GFP_KERNEL);
	197	if (!drv_data)
	198	return -ENOMEM;
	199
	200	drv_data->i2c_client = i2c_client;
	201
	202	ret = menf21bmc_hwmon_get_volt_limits(drv_data);
	203	if (ret) {
	204	dev_err(&pdev->dev, "failed to read sensor limits");
	205	return ret;
	206	}
	207
	208	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
	209	"menf21bmc", drv_data,
	210	menf21bmc_hwmon_groups);
	211	if (IS_ERR(hwmon_dev))
	212	return PTR_ERR(hwmon_dev);
	213
	214	dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");
	215
	216	return 0;
	217	}
	218
	219	static struct platform_driver menf21bmc_hwmon = {
	220	.probe = menf21bmc_hwmon_probe,
221	.driver = {
222	.name = DRV_NAME,
96435693 AW	223	},
	224	};
	225
	226	module_platform_driver(menf21bmc_hwmon);
	227
	228	MODULE_AUTHOR("Andreas Werner <[email protected]>");
	229	MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");
	230	MODULE_LICENSE("GPL v2");
	231	MODULE_ALIAS("platform:menf21bmc_hwmon");