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

/*
 *  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
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

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