[Skiboot] [RFC PATCH 3/3] hwmon: (ibmpowernv) add DTS support
Cédric Le Goater
clg at fr.ibm.com
Sat Feb 21 02:07:37 AEDT 2015
This patch reworks the ibmpowernv driver to support the new device tree
for sensors exposed by OPAL. It also adds new sensors : the core and
memory buffers DTS.
Hopefully, the proposed framework is good enough to easily add sensors
for other resources such as volts, planar temperatures, etc.
Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---
drivers/hwmon/ibmpowernv.c | 336 ++++++++++++++++++++++++--------------------
1 file changed, 180 insertions(+), 156 deletions(-)
diff --git a/drivers/hwmon/ibmpowernv.c b/drivers/hwmon/ibmpowernv.c
index febe8175d36c..9a6ee33f8219 100644
--- a/drivers/hwmon/ibmpowernv.c
+++ b/drivers/hwmon/ibmpowernv.c
@@ -32,247 +32,276 @@
#include <linux/err.h>
#define MAX_ATTR_LEN 32
-
-/* Sensor suffix name from DT */
-#define DT_FAULT_ATTR_SUFFIX "faulted"
-#define DT_DATA_ATTR_SUFFIX "data"
-#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
+#define MAX_LABEL_LEN 64
+#define MAX_ATTRS 3 /* sensor-data, sensor-status, label */
/*
* Enumerates all the types of sensors in the POWERNV platform and does index
- * into 'struct sensor_group'
+ * into 'struct sensor_type'
*/
enum sensors {
FAN,
- AMBIENT_TEMP,
+ TEMP,
POWER_SUPPLY,
POWER_INPUT,
MAX_SENSOR_TYPE,
};
-static struct sensor_group {
+static struct sensor_type {
+ enum sensors type;
const char *name;
- const char *compatible;
- struct attribute_group group;
- u32 attr_count;
-} 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"}
+ u32 count;
+} sensor_types[] = {
+ { FAN, "fan" },
+ { TEMP, "temp" },
+ { POWER_SUPPLY, "power" },
+ { POWER_INPUT, "in" },
+ { MAX_SENSOR_TYPE, NULL }
};
struct sensor_data {
- u32 id; /* An opaque id of the firmware for each sensor */
+ u32 data;
+ u32 status;
+ char label[MAX_LABEL_LEN];
enum sensors type;
- char name[MAX_ATTR_LEN];
- struct device_attribute dev_attr;
+ char attr_name[MAX_ATTRS][MAX_ATTR_LEN];
+ struct sensor_device_attribute sd_attrs[MAX_ATTRS];
};
struct platform_data {
- const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1];
+ struct attribute_group attr_group;
+ const struct attribute_group *groups[2];
u32 sensors_count; /* Total count of sensors from each group */
+ struct attribute **attrs;
+ struct sensor_data **sensors;
};
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);
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+ struct sensor_data *sdata = pdata->sensors[attr->index];
ssize_t ret;
u32 x;
- ret = opal_get_sensor_data(sdata->id, &x);
+ ret = opal_get_sensor_data(sdata->data, &x);
if (ret)
return ret;
/* Convert temperature to milli-degrees */
- if (sdata->type == AMBIENT_TEMP)
+ if (sdata->type == TEMP)
x *= 1000;
/* Convert power to micro-watts */
- else if (sdata->type == POWER_INPUT)
+ else if (sdata->type == POWER_SUPPLY)
x *= 1000000;
return sprintf(buf, "%u\n", x);
}
-static int get_sensor_index_attr(const char *name, u32 *index,
- char *attr)
+static ssize_t show_alarm(struct device *dev, struct device_attribute *devattr,
+ char *buf)
{
- 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;
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+ struct sensor_data *sdata = pdata->sensors[attr->index];
+ ssize_t ret;
+ u32 x;
- strncpy(buf, hash_pos + 1, copy_len);
+ ret = opal_get_sensor_data(sdata->status, &x);
+ if (ret)
+ return ret;
- err = kstrtou32(buf, 10, index);
- if (err)
- return err;
+ /*
+ * Depending on the sensor type, the status bits can have
+ * different meanings. Let's not be too subtil for the moment,
+ * testing against 0x6 should raise an alarm.
+ */
+ return sprintf(buf, "%u\n", x & 0x6);
+}
- strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);
+static ssize_t show_label(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+ struct sensor_data *sdata = pdata->sensors[attr->index];
- return 0;
+ return sprintf(buf, "%s\n", sdata->label);
}
-/*
- * 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 int create_hwmon_attr_name(struct device *dev, enum sensors type,
- const char *node_name,
- char *hwmon_attr_name)
+static struct sensor_type *__init get_sensor_type(struct platform_device *pdev,
+ struct device_node *np)
{
- char attr_suffix[MAX_ATTR_LEN];
- char *attr_name;
- u32 index;
- int err;
+ const char *type;
+ int i;
- err = get_sensor_index_attr(node_name, &index, attr_suffix);
- if (err) {
- dev_err(dev, "Sensor device node name '%s' is invalid\n",
- node_name);
- return err;
- }
+ if (np->name == NULL)
+ return NULL;
+
+ if (!of_device_is_compatible(np, "ibm,opal-sensor"))
+ return NULL;
- if (!strcmp(attr_suffix, DT_FAULT_ATTR_SUFFIX)) {
- attr_name = "fault";
- } else if (!strcmp(attr_suffix, DT_DATA_ATTR_SUFFIX)) {
- attr_name = "input";
- } else if (!strcmp(attr_suffix, DT_THRESHOLD_ATTR_SUFFIX)) {
- if (type == AMBIENT_TEMP)
- attr_name = "max";
- else if (type == FAN)
- attr_name = "min";
- else
- return -ENOENT;
- } else {
- return -ENOENT;
+ if (of_property_read_string(np, "sensor-type", &type)) {
+ dev_info(&pdev->dev,
+ "'sensor-type' missing in the node '%s'\n",
+ np->name);
+ return NULL;
}
- snprintf(hwmon_attr_name, MAX_ATTR_LEN, "%s%d_%s",
- sensor_groups[type].name, index, attr_name);
- return 0;
+ for (i = 0 ; i < MAX_SENSOR_TYPE; i++)
+ if (!strcmp(type, sensor_types[i].name))
+ return &sensor_types[i];
+
+ return NULL;
}
-static int populate_attr_groups(struct platform_device *pdev)
+static void __init make_sensor_label(struct device_node *np,
+ struct sensor_data *sdata, const char *label)
{
- struct platform_data *pdata = platform_get_drvdata(pdev);
- const struct attribute_group **pgroups = pdata->attr_groups;
- struct device_node *opal, *np;
- enum sensors type;
+ u32 id;
+ size_t n;
- opal = of_find_node_by_path("/ibm,opal/sensors");
- for_each_child_of_node(opal, np) {
- if (np->name == NULL)
- continue;
+ n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);
- for (type = 0; type < MAX_SENSOR_TYPE; type++)
- if (of_device_is_compatible(np,
- sensor_groups[type].compatible)) {
- sensor_groups[type].attr_count++;
- break;
- }
- }
+ /*
+ * Core temp pretty pretty
+ */
+ if (!of_property_read_u32(np, "ibm,pir", &id)) {
+ int i;
- of_node_put(opal);
+ for_each_possible_cpu(i)
+ if (paca[i].hw_cpu_id == id)
+ break;
- 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;
+ n += snprintf(sdata->label + n, sizeof(sdata->label) - n,
+ " %d-%d", i, i+7);
}
- return 0;
+ /*
+ * Membuffer pretty print
+ */
+ if (!of_property_read_u32(np, "ibm,chip-id", &id))
+ n += snprintf(sdata->label + n, sizeof(sdata->label) - n,
+ " %d", id & 0xffff);
}
-/*
- * 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)
+static int __init 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;
- struct sensor_data *sdata;
- u32 sensor_id;
- enum sensors type;
- u32 count = 0;
int err = 0;
+ int i = 0;
opal = of_find_node_by_path("/ibm,opal/sensors");
- sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
- GFP_KERNEL);
- if (!sdata) {
+ if (!opal) {
+ dev_dbg(&pdev->dev, "Opal node 'sensors' not found\n");
+ return -ENODEV;
+ }
+
+ for_each_child_of_node(opal, np) {
+ if (of_device_is_compatible(np, "ibm,opal-sensor"))
+ pdata->sensors_count++;
+ }
+
+ pdata->attrs = devm_kzalloc(&pdev->dev,
+ sizeof(*pdata->attrs) * pdata->sensors_count * MAX_ATTRS + 1,
+ GFP_KERNEL);
+ if (!pdata->attrs) {
+ err = -ENOMEM;
+ goto exit_put_node;
+ }
+ pdata->sensors = devm_kzalloc(&pdev->dev,
+ sizeof(*pdata->sensors) * pdata->sensors_count * MAX_ATTRS + 1,
+ GFP_KERNEL);
+ if (!pdata->sensors) {
err = -ENOMEM;
goto exit_put_node;
}
- for_each_child_of_node(opal, np) {
- if (np->name == NULL)
- continue;
- for (type = 0; type < MAX_SENSOR_TYPE; type++)
- if (of_device_is_compatible(np,
- sensor_groups[type].compatible))
- break;
+ for_each_child_of_node(opal, np) {
+ struct sensor_data *sdata;
+ struct sensor_type *stype;
+ u32 sensor_data;
+ const char *label;
- if (type == MAX_SENSOR_TYPE)
+ stype = get_sensor_type(pdev, np);
+ if (!stype)
continue;
- if (of_property_read_u32(np, "sensor-id", &sensor_id)) {
+ if (of_property_read_u32(np, "sensor-data", &sensor_data)) {
dev_info(&pdev->dev,
- "'sensor-id' missing in the node '%s'\n",
+ "'sensor-data' missing in the node '%s'\n",
np->name);
continue;
}
- sdata[count].id = sensor_id;
- sdata[count].type = type;
- err = create_hwmon_attr_name(&pdev->dev, type, np->name,
- sdata[count].name);
- if (err)
+ sdata = devm_kzalloc(&pdev->dev, sizeof(*sdata), GFP_KERNEL);
+ if (sdata == NULL) {
+ err = -ENOMEM;
goto exit_put_node;
+ }
+
+ stype->count++;
+ sdata->data = sensor_data;
+ sdata->type = stype->type;
+
+ snprintf(sdata->attr_name[0], MAX_ATTR_LEN, "%s%d_input",
+ stype->name, stype->count);
+
+ sysfs_attr_init(&sdata->sd_attrs[0].dev_attr.attr);
+ sdata->sd_attrs[0].dev_attr.attr.name = sdata->attr_name[0];
+ sdata->sd_attrs[0].dev_attr.attr.mode = S_IRUGO;
+ sdata->sd_attrs[0].dev_attr.show = show_sensor;
+ sdata->sd_attrs[0].index = i;
+
+ pdata->attrs[i] = &sdata->sd_attrs[0].dev_attr.attr;
+ pdata->sensors[i++] = sdata;
+
+ if (!of_property_read_u32(np, "sensor-status",
+ &sdata->status)) {
+ snprintf(sdata->attr_name[1], MAX_ATTR_LEN,
+ "%s%d_alarm", stype->name, stype->count);
+
+ sysfs_attr_init(&sdata->sd_attrs[1].dev_attr.attr);
+ sdata->sd_attrs[1].dev_attr.attr.name =
+ sdata->attr_name[1];
+ sdata->sd_attrs[1].dev_attr.attr.mode = S_IRUGO;
+ sdata->sd_attrs[1].dev_attr.show = show_alarm;
+ sdata->sd_attrs[1].index = i;
+
+ pdata->attrs[i] = &sdata->sd_attrs[1].dev_attr.attr;
+ pdata->sensors[i++] = sdata;
+ }
+
+ if (!of_property_read_string(np, "label", &label)) {
+ snprintf(sdata->attr_name[2], MAX_ATTR_LEN,
+ "%s%d_label", stype->name, stype->count);
- sysfs_attr_init(&sdata[count].dev_attr.attr);
- sdata[count].dev_attr.attr.name = sdata[count].name;
- sdata[count].dev_attr.attr.mode = S_IRUGO;
- sdata[count].dev_attr.show = show_sensor;
+ make_sensor_label(np, sdata, label);
- pgroups[type]->attrs[sensor_groups[type].attr_count++] =
- &sdata[count++].dev_attr.attr;
+ sysfs_attr_init(&sdata->sd_attrs[2].dev_attr.attr);
+ sdata->sd_attrs[2].dev_attr.attr.name =
+ sdata->attr_name[2];
+ sdata->sd_attrs[2].dev_attr.attr.mode = S_IRUGO;
+ sdata->sd_attrs[2].dev_attr.show = show_label;
+ sdata->sd_attrs[2].index = i;
+
+ pdata->attrs[i] = &sdata->sd_attrs[2].dev_attr.attr;
+ pdata->sensors[i++] = sdata;
+ }
}
+ pdata->attr_group.attrs = pdata->attrs;
+ pdata->groups[0] = &pdata->attr_group;
+
exit_put_node:
of_node_put(opal);
return err;
}
-static int ibmpowernv_probe(struct platform_device *pdev)
+static int __init ibmpowernv_probe(struct platform_device *pdev)
{
struct platform_data *pdata;
struct device *hwmon_dev;
@@ -288,15 +317,10 @@ static int ibmpowernv_probe(struct platform_device *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);
+ pdata->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
--
1.7.10.4
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