[mirror_ubuntu-bionic-kernel.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>

#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
show_label(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
show_in(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
show_min(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
show_max(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]);
}

#define create_voltage_sysfs(idx)			\
static SENSOR_DEVICE_ATTR(in##idx##_input, S_IRUGO,	\
			show_in, NULL, idx);		\
static SENSOR_DEVICE_ATTR(in##idx##_min, S_IRUGO,	\
			show_min, NULL, idx);		\
static SENSOR_DEVICE_ATTR(in##idx##_max, S_IRUGO,	\
			show_max, NULL, idx);		\
static SENSOR_DEVICE_ATTR(in##idx##_label, S_IRUGO,	\
			show_label, NULL, idx);

create_voltage_sysfs(0);
create_voltage_sysfs(1);
create_voltage_sysfs(2);
create_voltage_sysfs(3);
create_voltage_sysfs(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,
		.owner		= THIS_MODULE,
	},
};

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>
	24
	25	#define DRV_NAME "menf21bmc_hwmon"
	26
	27	#define BMC_VOLT_COUNT 5
	28	#define MENF21BMC_V33 0
	29	#define MENF21BMC_V5 1
	30	#define MENF21BMC_V12 2
	31	#define MENF21BMC_V5_SB 3
	32	#define MENF21BMC_VBAT 4
	33
	34	#define IDX_TO_VOLT_MIN_CMD(idx) (0x40 + idx)
	35	#define IDX_TO_VOLT_MAX_CMD(idx) (0x50 + idx)
	36	#define IDX_TO_VOLT_INP_CMD(idx) (0x60 + idx)
	37
	38	struct menf21bmc_hwmon {
	39	bool valid;
	40	struct i2c_client *i2c_client;
	41	unsigned long last_update;
	42	int in_val[BMC_VOLT_COUNT];
	43	int in_min[BMC_VOLT_COUNT];
	44	int in_max[BMC_VOLT_COUNT];
	45	};
	46
	47	static const char *const input_names[] = {
	48	[MENF21BMC_V33] = "MON_3_3V",
	49	[MENF21BMC_V5] = "MON_5V",
	50	[MENF21BMC_V12] = "MON_12V",
	51	[MENF21BMC_V5_SB] = "5V_STANDBY",
	52	[MENF21BMC_VBAT] = "VBAT"
	53	};
	54
	55	static struct menf21bmc_hwmon menf21bmc_hwmon_update(struct device dev)
	56	{
	57	int i;
	58	int val;
	59	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
	60	struct menf21bmc_hwmon *data_ret = drv_data;
	61
	62	if (time_after(jiffies, drv_data->last_update + HZ)
	63	\|\| !drv_data->valid) {
	64	for (i = 0; i < BMC_VOLT_COUNT; i++) {
65	val = i2c_smbus_read_word_data(drv_data->i2c_client,
66	IDX_TO_VOLT_INP_CMD(i));
67	if (val < 0) {
68	data_ret = ERR_PTR(val);
69	goto abort;
70	}
71	drv_data->in_val[i] = val;
72	}
73	drv_data->last_update = jiffies;
74	drv_data->valid = true;
75	}
76	abort:
77	return data_ret;
78	}
79
80	static int menf21bmc_hwmon_get_volt_limits(struct menf21bmc_hwmon *drv_data)
81	{
82	int i, val;
83
84	for (i = 0; i < BMC_VOLT_COUNT; i++) {
85	val = i2c_smbus_read_word_data(drv_data->i2c_client,
86	IDX_TO_VOLT_MIN_CMD(i));
87	if (val < 0)
88	return val;
89
90	drv_data->in_min[i] = val;
91
92	val = i2c_smbus_read_word_data(drv_data->i2c_client,
93	IDX_TO_VOLT_MAX_CMD(i));
94	if (val < 0)
95	return val;
96
97	drv_data->in_max[i] = val;
98	}
99	return 0;
100	}
101
102	static ssize_t
103	show_label(struct device dev, struct device_attribute devattr, char *buf)
104	{
105	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
106
107	return sprintf(buf, "%s\n", input_names[attr->index]);
108	}
109
110	static ssize_t
111	show_in(struct device dev, struct device_attribute devattr, char *buf)
112	{
113	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
114	struct menf21bmc_hwmon *drv_data = menf21bmc_hwmon_update(dev);
115
116	if (IS_ERR(drv_data))
117	return PTR_ERR(drv_data);
118
119	return sprintf(buf, "%d\n", drv_data->in_val[attr->index]);
120	}
121
122	static ssize_t
123	show_min(struct device dev, struct device_attribute devattr, char *buf)
124	{
125	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
126	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
127
128	return sprintf(buf, "%d\n", drv_data->in_min[attr->index]);
129	}
130
131	static ssize_t
132	show_max(struct device dev, struct device_attribute devattr, char *buf)
133	{
134	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
135	struct menf21bmc_hwmon *drv_data = dev_get_drvdata(dev);
136
137	return sprintf(buf, "%d\n", drv_data->in_max[attr->index]);
138	}
139
140	#define create_voltage_sysfs(idx) \
141	static SENSOR_DEVICE_ATTR(in##idx##_input, S_IRUGO, \
142	show_in, NULL, idx); \
143	static SENSOR_DEVICE_ATTR(in##idx##_min, S_IRUGO, \
144	show_min, NULL, idx); \
145	static SENSOR_DEVICE_ATTR(in##idx##_max, S_IRUGO, \
146	show_max, NULL, idx); \
147	static SENSOR_DEVICE_ATTR(in##idx##_label, S_IRUGO, \
148	show_label, NULL, idx);
149
150	create_voltage_sysfs(0);
151	create_voltage_sysfs(1);
152	create_voltage_sysfs(2);
153	create_voltage_sysfs(3);
154	create_voltage_sysfs(4);
155
156	static struct attribute *menf21bmc_hwmon_attrs[] = {
157	&sensor_dev_attr_in0_input.dev_attr.attr,
158	&sensor_dev_attr_in0_min.dev_attr.attr,
159	&sensor_dev_attr_in0_max.dev_attr.attr,
160	&sensor_dev_attr_in0_label.dev_attr.attr,
161
162	&sensor_dev_attr_in1_input.dev_attr.attr,
163	&sensor_dev_attr_in1_min.dev_attr.attr,
164	&sensor_dev_attr_in1_max.dev_attr.attr,
165	&sensor_dev_attr_in1_label.dev_attr.attr,
166
167	&sensor_dev_attr_in2_input.dev_attr.attr,
168	&sensor_dev_attr_in2_min.dev_attr.attr,
169	&sensor_dev_attr_in2_max.dev_attr.attr,
170	&sensor_dev_attr_in2_label.dev_attr.attr,
171
172	&sensor_dev_attr_in3_input.dev_attr.attr,
173	&sensor_dev_attr_in3_min.dev_attr.attr,
174	&sensor_dev_attr_in3_max.dev_attr.attr,
175	&sensor_dev_attr_in3_label.dev_attr.attr,
176
177	&sensor_dev_attr_in4_input.dev_attr.attr,
178	&sensor_dev_attr_in4_min.dev_attr.attr,
179	&sensor_dev_attr_in4_max.dev_attr.attr,
180	&sensor_dev_attr_in4_label.dev_attr.attr,
181	NULL
182	};
183
184	ATTRIBUTE_GROUPS(menf21bmc_hwmon);
185
186	static int menf21bmc_hwmon_probe(struct platform_device *pdev)
187	{
188	int ret;
189	struct menf21bmc_hwmon *drv_data;
190	struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
191	struct device *hwmon_dev;
192
193	drv_data = devm_kzalloc(&pdev->dev, sizeof(struct menf21bmc_hwmon),
194	GFP_KERNEL);
195	if (!drv_data)
196	return -ENOMEM;
197
198	drv_data->i2c_client = i2c_client;
199
200	ret = menf21bmc_hwmon_get_volt_limits(drv_data);
201	if (ret) {
202	dev_err(&pdev->dev, "failed to read sensor limits");
203	return ret;
204	}
205
206	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
207	"menf21bmc", drv_data,
208	menf21bmc_hwmon_groups);
209	if (IS_ERR(hwmon_dev))
210	return PTR_ERR(hwmon_dev);
211
212	dev_info(&pdev->dev, "MEN 14F021P00 BMC hwmon device enabled");
213
214	return 0;
215	}
216
217	static struct platform_driver menf21bmc_hwmon = {
218	.probe = menf21bmc_hwmon_probe,
219	.driver = {
220	.name = DRV_NAME,
221	.owner = THIS_MODULE,
222	},
223	};
224
225	module_platform_driver(menf21bmc_hwmon);
226
227	MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
228	MODULE_DESCRIPTION("MEN 14F021P00 BMC hwmon");
229	MODULE_LICENSE("GPL v2");
230	MODULE_ALIAS("platform:menf21bmc_hwmon");