[linux-2.6-block.git] / drivers / hwmon / ibmpowernv.c

/*
 * IBM PowerNV platform sensors for temperature/fan/voltage/power
 * Copyright (C) 2014 IBM
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.
 */

#define DRVNAME		"ibmpowernv"
#define pr_fmt(fmt)	DRVNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/of.h>
#include <linux/slab.h>

#include <linux/platform_device.h>
#include <asm/opal.h>
#include <linux/err.h>

#define MAX_ATTR_LEN	32
#define MAX_LABEL_LEN	64

/* Sensor suffix name from DT */
#define DT_FAULT_ATTR_SUFFIX		"faulted"
#define DT_DATA_ATTR_SUFFIX		"data"
#define DT_THRESHOLD_ATTR_SUFFIX	"thrs"

/*
 * Enumerates all the types of sensors in the POWERNV platform and does index
 * into 'struct sensor_group'
 */
enum sensors {
	FAN,
	TEMP,
	POWER_SUPPLY,
	POWER_INPUT,
	MAX_SENSOR_TYPE,
};

#define INVALID_INDEX (-1U)

static struct sensor_group {
	const char *name;
	const char *compatible;
	struct attribute_group group;
	u32 attr_count;
	u32 hwmon_index;
} sensor_groups[] = {
	{"fan", "ibm,opal-sensor-cooling-fan"},
	{"temp", "ibm,opal-sensor-amb-temp"},
	{"in", "ibm,opal-sensor-power-supply"},
	{"power", "ibm,opal-sensor-power"}
};

struct sensor_data {
	u32 id; /* An opaque id of the firmware for each sensor */
	u32 hwmon_index;
	u32 opal_index;
	enum sensors type;
	char label[MAX_LABEL_LEN];
	char name[MAX_ATTR_LEN];
	struct device_attribute dev_attr;
};

struct platform_data {
	const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
	u32 sensors_count; /* Total count of sensors from each group */
};

static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
			   char *buf)
{
	struct sensor_data *sdata = container_of(devattr, struct sensor_data,
						 dev_attr);
	ssize_t ret;
	u32 x;

	ret = opal_get_sensor_data(sdata->id, &x);
	if (ret)
		return ret;

	/* Convert temperature to milli-degrees */
	if (sdata->type == TEMP)
		x *= 1000;
	/* Convert power to micro-watts */
	else if (sdata->type == POWER_INPUT)
		x *= 1000000;

	return sprintf(buf, "%u\n", x);
}

static ssize_t show_label(struct device *dev, struct device_attribute *devattr,
			  char *buf)
{
	struct sensor_data *sdata = container_of(devattr, struct sensor_data,
						 dev_attr);

	return sprintf(buf, "%s\n", sdata->label);
}

static void __init make_sensor_label(struct device_node *np,
				     struct sensor_data *sdata,
				     const char *label)
{
	size_t n;

	n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);
}

static int get_sensor_index_attr(const char *name, u32 *index, char *attr)
{
	char *hash_pos = strchr(name, '#');
	char buf[8] = { 0 };
	char *dash_pos;
	u32 copy_len;
	int err;

	if (!hash_pos)
		return -EINVAL;

	dash_pos = strchr(hash_pos, '-');
	if (!dash_pos)
		return -EINVAL;

	copy_len = dash_pos - hash_pos - 1;
	if (copy_len >= sizeof(buf))
		return -EINVAL;

	strncpy(buf, hash_pos + 1, copy_len);

	err = kstrtou32(buf, 10, index);
	if (err)
		return err;

	strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);

	return 0;
}

static const char *convert_opal_attr_name(enum sensors type,
					  const char *opal_attr)
{
	const char *attr_name = NULL;

	if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) {
		attr_name = "fault";
	} else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) {
		attr_name = "input";
	} else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) {
		if (type == TEMP)
			attr_name = "max";
		else if (type == FAN)
			attr_name = "min";
	}

	return attr_name;
}

/*
 * This function translates the DT node name into the 'hwmon' attribute name.
 * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
 * which need to be mapped as fan2_input, temp1_max respectively before
 * populating them inside hwmon device class.
 */
static const char *parse_opal_node_name(const char *node_name,
					enum sensors type, u32 *index)
{
	char attr_suffix[MAX_ATTR_LEN];
	const char *attr_name;
	int err;

	err = get_sensor_index_attr(node_name, index, attr_suffix);
	if (err)
		return ERR_PTR(err);

	attr_name = convert_opal_attr_name(type, attr_suffix);
	if (!attr_name)
		return ERR_PTR(-ENOENT);

	return attr_name;
}

static int get_sensor_type(struct device_node *np)
{
	enum sensors type;
	const char *str;

	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
		if (of_device_is_compatible(np, sensor_groups[type].compatible))
			return type;
	}

	/*
	 * Let's check if we have a newer device tree
	 */
	if (!of_device_is_compatible(np, "ibm,opal-sensor"))
		return MAX_SENSOR_TYPE;

	if (of_property_read_string(np, "sensor-type", &str))
		return MAX_SENSOR_TYPE;

	for (type = 0; type < MAX_SENSOR_TYPE; type++)
		if (!strcmp(str, sensor_groups[type].name))
			return type;

	return MAX_SENSOR_TYPE;
}

static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
				  struct sensor_data *sdata_table, int count)
{
	int i;

	/*
	 * We don't use the OPAL index on newer device trees
	 */
	if (sdata->opal_index != INVALID_INDEX) {
		for (i = 0; i < count; i++)
			if (sdata_table[i].opal_index == sdata->opal_index &&
			    sdata_table[i].type == sdata->type)
				return sdata_table[i].hwmon_index;
	}
	return ++sensor_groups[sdata->type].hwmon_index;
}

static int populate_attr_groups(struct platform_device *pdev)
{
	struct platform_data *pdata = platform_get_drvdata(pdev);
	const struct attribute_group **pgroups = pdata->attr_groups;
	struct device_node *opal, *np;
	enum sensors type;

	opal = of_find_node_by_path("/ibm,opal/sensors");
	for_each_child_of_node(opal, np) {
		const char *label;

		if (np->name == NULL)
			continue;

		type = get_sensor_type(np);
		if (type == MAX_SENSOR_TYPE)
			continue;

		sensor_groups[type].attr_count++;

		/*
		 * add a new attribute for labels
		 */
		if (!of_property_read_string(np, "label", &label))
			sensor_groups[type].attr_count++;
	}

	of_node_put(opal);

	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
		sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
					sizeof(struct attribute *) *
					(sensor_groups[type].attr_count + 1),
					GFP_KERNEL);
		if (!sensor_groups[type].group.attrs)
			return -ENOMEM;

		pgroups[type] = &sensor_groups[type].group;
		pdata->sensors_count += sensor_groups[type].attr_count;
		sensor_groups[type].attr_count = 0;
	}

	return 0;
}

static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
			      ssize_t (*show)(struct device *dev,
					      struct device_attribute *attr,
					      char *buf))
{
	snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s",
		 sensor_groups[sdata->type].name, sdata->hwmon_index,
		 attr_name);

	sysfs_attr_init(&sdata->dev_attr.attr);
	sdata->dev_attr.attr.name = sdata->name;
	sdata->dev_attr.attr.mode = S_IRUGO;
	sdata->dev_attr.show = show;
}

/*
 * Iterate through the device tree for each child of 'sensors' node, create
 * a sysfs attribute file, the file is named by translating the DT node name
 * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
 * etc..
 */
static int create_device_attrs(struct platform_device *pdev)
{
	struct platform_data *pdata = platform_get_drvdata(pdev);
	const struct attribute_group **pgroups = pdata->attr_groups;
	struct device_node *opal, *np;
	struct sensor_data *sdata;
	u32 sensor_id;
	enum sensors type;
	u32 count = 0;
	int err = 0;

	opal = of_find_node_by_path("/ibm,opal/sensors");
	sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
			     GFP_KERNEL);
	if (!sdata) {
		err = -ENOMEM;
		goto exit_put_node;
	}

	for_each_child_of_node(opal, np) {
		const char *attr_name;
		u32 opal_index;
		const char *label;

		if (np->name == NULL)
			continue;

		type = get_sensor_type(np);
		if (type == MAX_SENSOR_TYPE)
			continue;

		/*
		 * Newer device trees use a "sensor-data" property
		 * name for input.
		 */
		if (of_property_read_u32(np, "sensor-id", &sensor_id) &&
		    of_property_read_u32(np, "sensor-data", &sensor_id)) {
			dev_info(&pdev->dev,
				 "'sensor-id' missing in the node '%s'\n",
				 np->name);
			continue;
		}

		sdata[count].id = sensor_id;
		sdata[count].type = type;

		/*
		 * If we can not parse the node name, it means we are
		 * running on a newer device tree. We can just forget
		 * about the OPAL index and use a defaut value for the
		 * hwmon attribute name
		 */
		attr_name = parse_opal_node_name(np->name, type, &opal_index);
		if (IS_ERR(attr_name)) {
			attr_name = "input";
			opal_index = INVALID_INDEX;
		}

		sdata[count].opal_index = opal_index;
		sdata[count].hwmon_index =
			get_sensor_hwmon_index(&sdata[count], sdata, count);

		create_hwmon_attr(&sdata[count], attr_name, show_sensor);

		pgroups[type]->attrs[sensor_groups[type].attr_count++] =
				&sdata[count++].dev_attr.attr;

		if (!of_property_read_string(np, "label", &label)) {
			/*
			 * For the label attribute, we can reuse the
			 * "properties" of the previous "input"
			 * attribute. They are related to the same
			 * sensor.
			 */
			sdata[count].type = type;
			sdata[count].opal_index = sdata[count - 1].opal_index;
			sdata[count].hwmon_index = sdata[count - 1].hwmon_index;

			make_sensor_label(np, &sdata[count], label);

			create_hwmon_attr(&sdata[count], "label", show_label);

			pgroups[type]->attrs[sensor_groups[type].attr_count++] =
				&sdata[count++].dev_attr.attr;
		}
	}

exit_put_node:
	of_node_put(opal);
	return err;
}

static int ibmpowernv_probe(struct platform_device *pdev)
{
	struct platform_data *pdata;
	struct device *hwmon_dev;
	int err;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	platform_set_drvdata(pdev, pdata);
	pdata->sensors_count = 0;
	err = populate_attr_groups(pdev);
	if (err)
		return err;

	/* Create sysfs attribute data for each sensor found in the DT */
	err = create_device_attrs(pdev);
	if (err)
		return err;

	/* Finally, register with hwmon */
	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
							   pdata,
							   pdata->attr_groups);

	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct platform_device_id opal_sensor_driver_ids[] = {
	{
		.name = "opal-sensor",
	},
	{ }
};
MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);

static struct platform_driver ibmpowernv_driver = {
	.probe		= ibmpowernv_probe,
	.id_table	= opal_sensor_driver_ids,
	.driver		= {
		.name	= DRVNAME,
	},
};

module_platform_driver(ibmpowernv_driver);

MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("IBM POWERNV platform sensors");
MODULE_LICENSE("GPL");
Commit	Line	Data
24c1aa85 NG	1	/*
	2	* IBM PowerNV platform sensors for temperature/fan/voltage/power
	3	* Copyright (C) 2014 IBM
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program.
	17	*/
	18
	19	#define DRVNAME "ibmpowernv"
	20	#define pr_fmt(fmt) DRVNAME ": " fmt
	21
	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/kernel.h>
	25	#include <linux/hwmon.h>
	26	#include <linux/hwmon-sysfs.h>
	27	#include <linux/of.h>
	28	#include <linux/slab.h>
	29
	30	#include <linux/platform_device.h>
	31	#include <asm/opal.h>
	32	#include <linux/err.h>
	33
	34	#define MAX_ATTR_LEN 32
2bcd3787	35	#define MAX_LABEL_LEN 64
24c1aa85 NG	36
	37	/* Sensor suffix name from DT */
	38	#define DT_FAULT_ATTR_SUFFIX "faulted"
	39	#define DT_DATA_ATTR_SUFFIX "data"
	40	#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
	41
	42	/*
	43	* Enumerates all the types of sensors in the POWERNV platform and does index
	44	* into 'struct sensor_group'
	45	*/
	46	enum sensors {
	47	FAN,
96124610	48	TEMP,
24c1aa85 NG	49	POWER_SUPPLY,
	50	POWER_INPUT,
	51	MAX_SENSOR_TYPE,
	52	};
	53
14681637 CLG	54	#define INVALID_INDEX (-1U)
14681637 CLG	55
24c1aa85 NG	56	static struct sensor_group {
	57	const char *name;
	58	const char *compatible;
	59	struct attribute_group group;
	60	u32 attr_count;
fcaf57b6	61	u32 hwmon_index;
24c1aa85 NG	62	} sensor_groups[] = {
	63	{"fan", "ibm,opal-sensor-cooling-fan"},
	64	{"temp", "ibm,opal-sensor-amb-temp"},
	65	{"in", "ibm,opal-sensor-power-supply"},
	66	{"power", "ibm,opal-sensor-power"}
	67	};
	68
	69	struct sensor_data {
	70	u32 id; /* An opaque id of the firmware for each sensor */
fcaf57b6 CLG	71	u32 hwmon_index;
fcaf57b6 CLG	72	u32 opal_index;
24c1aa85	73	enum sensors type;
2bcd3787	74	char label[MAX_LABEL_LEN];
24c1aa85 NG	75	char name[MAX_ATTR_LEN];
	76	struct device_attribute dev_attr;
	77	};
	78
	79	struct platform_data {
	80	const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
	81	u32 sensors_count; /* Total count of sensors from each group */
	82	};
	83
24c1aa85 NG	84	static ssize_t show_sensor(struct device dev, struct device_attribute devattr,
	85	char *buf)
	86	{
	87	struct sensor_data *sdata = container_of(devattr, struct sensor_data,
	88	dev_attr);
	89	ssize_t ret;
	90	u32 x;
	91
	92	ret = opal_get_sensor_data(sdata->id, &x);
	93	if (ret)
	94	return ret;
	95
	96	/* Convert temperature to milli-degrees */
96124610	97	if (sdata->type == TEMP)
24c1aa85 NG	98	x *= 1000;
	99	/* Convert power to micro-watts */
	100	else if (sdata->type == POWER_INPUT)
	101	x *= 1000000;
	102
	103	return sprintf(buf, "%u\n", x);
	104	}
	105
2bcd3787 CLG	106	static ssize_t show_label(struct device dev, struct device_attribute devattr,
	107	char *buf)
	108	{
	109	struct sensor_data *sdata = container_of(devattr, struct sensor_data,
	110	dev_attr);
	111
	112	return sprintf(buf, "%s\n", sdata->label);
	113	}
	114
	115	static void __init make_sensor_label(struct device_node *np,
	116	struct sensor_data *sdata,
	117	const char *label)
	118	{
	119	size_t n;
	120
	121	n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);
	122	}
	123
	124	static int get_sensor_index_attr(const char name, u32 index, char *attr)
24c1aa85 NG	125	{
	126	char *hash_pos = strchr(name, '#');
	127	char buf[8] = { 0 };
	128	char *dash_pos;
	129	u32 copy_len;
	130	int err;
	131
	132	if (!hash_pos)
	133	return -EINVAL;
	134
	135	dash_pos = strchr(hash_pos, '-');
	136	if (!dash_pos)
	137	return -EINVAL;
	138
	139	copy_len = dash_pos - hash_pos - 1;
	140	if (copy_len >= sizeof(buf))
	141	return -EINVAL;
	142
	143	strncpy(buf, hash_pos + 1, copy_len);
	144
	145	err = kstrtou32(buf, 10, index);
	146	if (err)
	147	return err;
	148
	149	strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);
	150
	151	return 0;
	152	}
	153
ccc9ac6c CLG	154	static const char *convert_opal_attr_name(enum sensors type,
	155	const char *opal_attr)
	156	{
	157	const char *attr_name = NULL;
	158
	159	if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) {
	160	attr_name = "fault";
	161	} else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) {
	162	attr_name = "input";
	163	} else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) {
	164	if (type == TEMP)
	165	attr_name = "max";
	166	else if (type == FAN)
	167	attr_name = "min";
	168	}
	169
	170	return attr_name;
	171	}
	172
24c1aa85 NG	173	/*
	174	* This function translates the DT node name into the 'hwmon' attribute name.
	175	* IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
	176	* which need to be mapped as fan2_input, temp1_max respectively before
	177	* populating them inside hwmon device class.
	178	*/
f9f54f16 CLG	179	static const char parse_opal_node_name(const char node_name,
f9f54f16 CLG	180	enum sensors type, u32 *index)
24c1aa85 NG	181	{
24c1aa85 NG	182	char attr_suffix[MAX_ATTR_LEN];
ccc9ac6c	183	const char *attr_name;
24c1aa85 NG	184	int err;
24c1aa85 NG	185
f9f54f16 CLG	186	err = get_sensor_index_attr(node_name, index, attr_suffix);
	187	if (err)
	188	return ERR_PTR(err);
24c1aa85	189
ccc9ac6c CLG	190	attr_name = convert_opal_attr_name(type, attr_suffix);
ccc9ac6c CLG	191	if (!attr_name)
f9f54f16	192	return ERR_PTR(-ENOENT);
24c1aa85	193
f9f54f16	194	return attr_name;
24c1aa85 NG	195	}
24c1aa85 NG	196
c4ad4720 CLG	197	static int get_sensor_type(struct device_node *np)
	198	{
	199	enum sensors type;
14681637	200	const char *str;
c4ad4720 CLG	201
	202	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
	203	if (of_device_is_compatible(np, sensor_groups[type].compatible))
	204	return type;
	205	}
14681637 CLG	206
	207	/*
	208	* Let's check if we have a newer device tree
	209	*/
	210	if (!of_device_is_compatible(np, "ibm,opal-sensor"))
	211	return MAX_SENSOR_TYPE;
	212
	213	if (of_property_read_string(np, "sensor-type", &str))
	214	return MAX_SENSOR_TYPE;
	215
	216	for (type = 0; type < MAX_SENSOR_TYPE; type++)
	217	if (!strcmp(str, sensor_groups[type].name))
	218	return type;
	219
c4ad4720 CLG	220	return MAX_SENSOR_TYPE;
	221	}
	222
fcaf57b6 CLG	223	static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
	224	struct sensor_data *sdata_table, int count)
	225	{
	226	int i;
	227
14681637 CLG	228	/*
	229	* We don't use the OPAL index on newer device trees
	230	*/
	231	if (sdata->opal_index != INVALID_INDEX) {
	232	for (i = 0; i < count; i++)
	233	if (sdata_table[i].opal_index == sdata->opal_index &&
	234	sdata_table[i].type == sdata->type)
	235	return sdata_table[i].hwmon_index;
	236	}
fcaf57b6 CLG	237	return ++sensor_groups[sdata->type].hwmon_index;
	238	}
	239
8de303ba	240	static int populate_attr_groups(struct platform_device *pdev)
24c1aa85 NG	241	{
	242	struct platform_data *pdata = platform_get_drvdata(pdev);
	243	const struct attribute_group **pgroups = pdata->attr_groups;
	244	struct device_node opal, np;
	245	enum sensors type;
	246
	247	opal = of_find_node_by_path("/ibm,opal/sensors");
24c1aa85	248	for_each_child_of_node(opal, np) {
2bcd3787 CLG	249	const char *label;
2bcd3787 CLG	250
24c1aa85 NG	251	if (np->name == NULL)
	252	continue;
	253
c4ad4720	254	type = get_sensor_type(np);
2bcd3787 CLG	255	if (type == MAX_SENSOR_TYPE)
	256	continue;
	257
	258	sensor_groups[type].attr_count++;
	259
	260	/*
	261	* add a new attribute for labels
	262	*/
	263	if (!of_property_read_string(np, "label", &label))
c4ad4720	264	sensor_groups[type].attr_count++;
24c1aa85 NG	265	}
	266
	267	of_node_put(opal);
	268
	269	for (type = 0; type < MAX_SENSOR_TYPE; type++) {
	270	sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
	271	sizeof(struct attribute )
	272	(sensor_groups[type].attr_count + 1),
	273	GFP_KERNEL);
	274	if (!sensor_groups[type].group.attrs)
	275	return -ENOMEM;
	276
	277	pgroups[type] = &sensor_groups[type].group;
	278	pdata->sensors_count += sensor_groups[type].attr_count;
	279	sensor_groups[type].attr_count = 0;
	280	}
	281
	282	return 0;
	283	}
	284
9e4f74b1 CLG	285	static void create_hwmon_attr(struct sensor_data sdata, const char attr_name,
	286	ssize_t (show)(struct device dev,
	287	struct device_attribute *attr,
	288	char *buf))
	289	{
	290	snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s",
	291	sensor_groups[sdata->type].name, sdata->hwmon_index,
	292	attr_name);
	293
	294	sysfs_attr_init(&sdata->dev_attr.attr);
	295	sdata->dev_attr.attr.name = sdata->name;
	296	sdata->dev_attr.attr.mode = S_IRUGO;
	297	sdata->dev_attr.show = show;
	298	}
	299
24c1aa85 NG	300	/*
	301	* Iterate through the device tree for each child of 'sensors' node, create
	302	* a sysfs attribute file, the file is named by translating the DT node name
	303	* to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
	304	* etc..
	305	*/
8de303ba	306	static int create_device_attrs(struct platform_device *pdev)
24c1aa85 NG	307	{
	308	struct platform_data *pdata = platform_get_drvdata(pdev);
	309	const struct attribute_group **pgroups = pdata->attr_groups;
	310	struct device_node opal, np;
	311	struct sensor_data *sdata;
18d03f3c	312	u32 sensor_id;
24c1aa85 NG	313	enum sensors type;
	314	u32 count = 0;
	315	int err = 0;
	316
	317	opal = of_find_node_by_path("/ibm,opal/sensors");
	318	sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
	319	GFP_KERNEL);
	320	if (!sdata) {
	321	err = -ENOMEM;
	322	goto exit_put_node;
	323	}
	324
	325	for_each_child_of_node(opal, np) {
f9f54f16 CLG	326	const char *attr_name;
f9f54f16 CLG	327	u32 opal_index;
2bcd3787	328	const char *label;
f9f54f16	329
24c1aa85 NG	330	if (np->name == NULL)
	331	continue;
	332
c4ad4720	333	type = get_sensor_type(np);
24c1aa85 NG	334	if (type == MAX_SENSOR_TYPE)
	335	continue;
	336
14681637 CLG	337	/*
	338	* Newer device trees use a "sensor-data" property
	339	* name for input.
	340	*/
	341	if (of_property_read_u32(np, "sensor-id", &sensor_id) &&
	342	of_property_read_u32(np, "sensor-data", &sensor_id)) {
24c1aa85 NG	343	dev_info(&pdev->dev,
	344	"'sensor-id' missing in the node '%s'\n",
	345	np->name);
	346	continue;
	347	}
	348
18d03f3c	349	sdata[count].id = sensor_id;
24c1aa85	350	sdata[count].type = type;
f9f54f16	351
14681637 CLG	352	/*
	353	* If we can not parse the node name, it means we are
	354	* running on a newer device tree. We can just forget
	355	* about the OPAL index and use a defaut value for the
	356	* hwmon attribute name
	357	*/
f9f54f16 CLG	358	attr_name = parse_opal_node_name(np->name, type, &opal_index);
f9f54f16 CLG	359	if (IS_ERR(attr_name)) {
14681637 CLG	360	attr_name = "input";
14681637 CLG	361	opal_index = INVALID_INDEX;
f9f54f16 CLG	362	}
f9f54f16 CLG	363
fcaf57b6 CLG	364	sdata[count].opal_index = opal_index;
	365	sdata[count].hwmon_index =
	366	get_sensor_hwmon_index(&sdata[count], sdata, count);
	367
9e4f74b1	368	create_hwmon_attr(&sdata[count], attr_name, show_sensor);
24c1aa85 NG	369
	370	pgroups[type]->attrs[sensor_groups[type].attr_count++] =
	371	&sdata[count++].dev_attr.attr;
2bcd3787 CLG	372
	373	if (!of_property_read_string(np, "label", &label)) {
	374	/*
	375	* For the label attribute, we can reuse the
	376	* "properties" of the previous "input"
	377	* attribute. They are related to the same
	378	* sensor.
	379	*/
	380	sdata[count].type = type;
	381	sdata[count].opal_index = sdata[count - 1].opal_index;
	382	sdata[count].hwmon_index = sdata[count - 1].hwmon_index;
	383
	384	make_sensor_label(np, &sdata[count], label);
	385
	386	create_hwmon_attr(&sdata[count], "label", show_label);
	387
	388	pgroups[type]->attrs[sensor_groups[type].attr_count++] =
	389	&sdata[count++].dev_attr.attr;
	390	}
24c1aa85 NG	391	}
	392
	393	exit_put_node:
	394	of_node_put(opal);
	395	return err;
	396	}
	397
8de303ba	398	static int ibmpowernv_probe(struct platform_device *pdev)
24c1aa85 NG	399	{
	400	struct platform_data *pdata;
	401	struct device *hwmon_dev;
	402	int err;
	403
	404	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	405	if (!pdata)
	406	return -ENOMEM;
	407
	408	platform_set_drvdata(pdev, pdata);
	409	pdata->sensors_count = 0;
	410	err = populate_attr_groups(pdev);
	411	if (err)
	412	return err;
	413
	414	/* Create sysfs attribute data for each sensor found in the DT */
	415	err = create_device_attrs(pdev);
	416	if (err)
	417	return err;
	418
	419	/* Finally, register with hwmon */
	420	hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
	421	pdata,
	422	pdata->attr_groups);
	423
	424	return PTR_ERR_OR_ZERO(hwmon_dev);
	425	}
	426
8de303ba NG	427	static const struct platform_device_id opal_sensor_driver_ids[] = {
	428	{
	429	.name = "opal-sensor",
	430	},
	431	{ }
	432	};
	433	MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);
	434
24c1aa85	435	static struct platform_driver ibmpowernv_driver = {
8de303ba NG	436	.probe = ibmpowernv_probe,
	437	.id_table = opal_sensor_driver_ids,
	438	.driver = {
8de303ba	439	.name = DRVNAME,
24c1aa85 NG	440	},
	441	};
	442
3bdec670	443	module_platform_driver(ibmpowernv_driver);
24c1aa85 NG	444
	445	MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
	446	MODULE_DESCRIPTION("IBM POWERNV platform sensors");
	447	MODULE_LICENSE("GPL");