[PATCH 4/4] drivers/hwmon/pmbus: Add debugfs for status registers
From: Eddie James
Date: Wed Aug 09 2017 - 18:19:44 EST
From: "Edward A. James" <eajames@xxxxxxxxxx>
Export all the available status registers through debugfs, if the client
driver wants them.
Signed-off-by: Edward A. James <eajames@xxxxxxxxxx>
---
drivers/hwmon/pmbus/pmbus.c | 24 +++++-
drivers/hwmon/pmbus/pmbus.h | 11 +++
drivers/hwmon/pmbus/pmbus_core.c | 175 +++++++++++++++++++++++++++++++++++++++
3 files changed, 209 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c
index 7718e58..fc27417 100644
--- a/drivers/hwmon/pmbus/pmbus.c
+++ b/drivers/hwmon/pmbus/pmbus.c
@@ -18,6 +18,7 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -230,7 +231,28 @@ static int pmbus_probe(struct i2c_client *client,
.id_table = pmbus_id,
};
-module_i2c_driver(pmbus_driver);
+struct dentry *pmbus_debugfs_dir;
+EXPORT_SYMBOL_GPL(pmbus_debugfs_dir);
+
+static int __init pmbus_init(void)
+{
+ pmbus_debugfs_dir = debugfs_create_dir(pmbus_driver.driver.name, NULL);
+ if (IS_ERR(pmbus_debugfs_dir))
+ /* Don't fail out if we don't have debugfs support. */
+ pmbus_debugfs_dir = NULL;
+
+ return i2c_add_driver(&pmbus_driver);
+}
+
+static void __exit pmbus_exit(void)
+{
+ debugfs_remove_recursive(pmbus_debugfs_dir);
+
+ i2c_del_driver(&pmbus_driver);
+}
+
+module_init(pmbus_init);
+module_exit(pmbus_exit);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("Generic PMBus driver");
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index bfcb13b..c772b83 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -25,6 +25,8 @@
#include <linux/bitops.h>
#include <linux/regulator/driver.h>
+struct dentry;
+
/*
* Registers
*/
@@ -383,6 +385,12 @@ struct pmbus_driver_info {
/* Regulator functionality, if supported by this chip driver. */
int num_regulators;
const struct regulator_desc *reg_desc;
+
+ /*
+ * Controls whether or not to create debugfs entries for this driver's
+ * devices.
+ */
+ bool debugfs;
};
/* Regulator ops */
@@ -401,6 +409,9 @@ struct pmbus_driver_info {
.owner = THIS_MODULE, \
}
+/* Handle for debugfs directory */
+extern struct dentry *pmbus_debugfs_dir;
+
/* Function declarations */
void pmbus_clear_cache(struct i2c_client *client);
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 1a51f8f..afbd364 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -19,6 +19,7 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -49,6 +50,9 @@
#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
#define PB_STATUS_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
#define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES)
+#define PB_STATUS_CML_BASE (PB_STATUS_INPUT_BASE + PMBUS_PAGES)
+#define PB_STATUS_OTHER_BASE (PB_STATUS_CML_BASE + PMBUS_PAGES)
+#define PB_STATUS_MFR_BASE (PB_STATUS_OTHER_BASE + PMBUS_PAGES)
#define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1)
#define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1)
@@ -101,6 +105,7 @@ struct pmbus_data {
int num_attributes;
struct attribute_group group;
const struct attribute_group *groups[2];
+ struct dentry *debugfs; /* debugfs device directory */
struct pmbus_sensor *sensors;
@@ -119,6 +124,11 @@ struct pmbus_data {
u8 currpage;
};
+struct pmbus_debugfs_entry {
+ struct device *dev;
+ int index;
+};
+
void pmbus_clear_cache(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
@@ -422,6 +432,19 @@ static struct pmbus_data *pmbus_update_device(struct device *dev)
= _pmbus_read_byte_data(client, i,
s->reg);
}
+
+ if (!data->debugfs)
+ continue;
+
+ data->status[PB_STATUS_CML_BASE + i]
+ = _pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_CML);
+ data->status[PB_STATUS_OTHER_BASE + i]
+ = _pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_OTHER);
+ data->status[PB_STATUS_MFR_BASE + i]
+ = _pmbus_read_byte_data(client, i,
+ PMBUS_STATUS_MFR_SPECIFIC);
}
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
@@ -1891,6 +1914,151 @@ static int pmbus_regulator_register(struct pmbus_data *data)
}
#endif
+static int pmbus_debugfs_get(void *data, u64 *val)
+{
+ struct pmbus_debugfs_entry *entry = data;
+ struct pmbus_data *pdata = pmbus_update_device(entry->dev);
+
+ *val = pdata->status[entry->index];
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops8, pmbus_debugfs_get, NULL,
+ "0x%02llx\n");
+DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops16, pmbus_debugfs_get, NULL,
+ "0x%04llx\n");
+
+static int pmbus_init_debugfs(struct i2c_client *client,
+ struct pmbus_data *data)
+{
+ int i, idx = 0;
+ struct dentry *dbg;
+ char name[PMBUS_NAME_SIZE];
+ struct pmbus_debugfs_entry *entries;
+
+ /*
+ * Either user didn't request debugfs or debugfs is not enabled in
+ * kernel. Exit but don't throw an error in these cases.
+ */
+ if (!data->info->debugfs || !pmbus_debugfs_dir)
+ return 0;
+
+ /*
+ * Create the debugfs directory for this device. Use the hwmon device
+ * name to avoid conflicts (hwmon numbers are globally unique).
+ */
+ data->debugfs = debugfs_create_dir(dev_name(data->hwmon_dev),
+ pmbus_debugfs_dir);
+ if (IS_ERR_OR_NULL(data->debugfs)) {
+ data->debugfs = NULL;
+ return -ENODEV;
+ }
+
+ /* Allocate the max possible entries we need. */
+ entries = devm_kzalloc(data->dev,
+ sizeof(*entries) * (data->info->pages * 10),
+ GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ for (i = 0; i < data->info->pages; ++i) {
+ /* check accessibility of status register if it's not page 0 */
+ if (!i || pmbus_check_status_register(client, i)) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops16);
+ }
+
+ if (data->info->func[i] & PMBUS_HAVE_STATUS_VOUT) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_VOUT_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_vout", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (data->info->func[i] & PMBUS_HAVE_STATUS_IOUT) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_IOUT_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_iout", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (data->info->func[i] & PMBUS_HAVE_STATUS_INPUT) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_INPUT_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_input", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (data->info->func[i] & PMBUS_HAVE_STATUS_TEMP) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_TEMP_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_temp", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (pmbus_check_byte_register(client, i, PMBUS_STATUS_CML)) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_CML_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_cml", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (pmbus_check_byte_register(client, i, PMBUS_STATUS_OTHER)) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_OTHER_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_other", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (pmbus_check_byte_register(client, i,
+ PMBUS_STATUS_MFR_SPECIFIC)) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_MFR_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_mfr", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN12) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_FAN_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_fan12", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+
+ if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN34) {
+ entries[idx].dev = data->hwmon_dev;
+ entries[idx].index = PB_STATUS_FAN34_BASE + i;
+ snprintf(name, PMBUS_NAME_SIZE, "status%d_fan34", i);
+ dbg = debugfs_create_file(name, 0444, data->debugfs,
+ &entries[idx++],
+ &pmbus_debugfs_ops8);
+ }
+ }
+
+ return 0;
+}
+
int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
struct pmbus_driver_info *info)
{
@@ -1950,6 +2118,10 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
if (ret)
goto out_unregister;
+ ret = pmbus_init_debugfs(client, data);
+ if (ret)
+ dev_warn(dev, "Failed to register debugfs\n");
+
return 0;
out_unregister:
@@ -1963,6 +2135,9 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
int pmbus_do_remove(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
+
+ debugfs_remove_recursive(data->debugfs);
+
hwmon_device_unregister(data->hwmon_dev);
kfree(data->group.attrs);
return 0;
--
1.8.3.1