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hwmon: (pmbus) Add debugfs for status registers

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Export all the available status registers through debugfs. This is
useful for hardware diagnostics, especially on multi-page pmbus devices,
as user-space access of the i2c space could corrupt the pmbus page
accounting.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Edward A. James 2017-08-14 13:55:41 -05:00 committed by Guenter Roeck
parent f198907d2f
commit 1e069dfd96
1 changed files with 210 additions and 0 deletions
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210
drivers/hwmon/pmbus/pmbus_core.c
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@ -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>
@ -101,6 +102,7 @@ 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;
@ -120,6 +122,12 @@ struct pmbus_data {
u8 currpage;
};
struct pmbus_debugfs_entry {
struct i2c_client *client;
u8 page;
u8 reg;
};
void pmbus_clear_cache(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);
@ -1893,6 +1901,184 @@ static int pmbus_regulator_register(struct pmbus_data *data)
}
#endif
static struct dentry *pmbus_debugfs_dir; /* pmbus debugfs directory */
#if IS_ENABLED(CONFIG_DEBUG_FS)
static int pmbus_debugfs_get(void *data, u64 *val)
{
int rc;
struct pmbus_debugfs_entry *entry = data;
rc = _pmbus_read_byte_data(entry->client, entry->page, entry->reg);
if (rc < 0)
return rc;
*val = rc;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops, pmbus_debugfs_get, NULL,
"0x%02llx\n");
static int pmbus_debugfs_get_status(void *data, u64 *val)
{
int rc;
struct pmbus_debugfs_entry *entry = data;
struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
rc = pdata->read_status(entry->client, entry->page);
if (rc < 0)
return rc;
*val = rc;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
NULL, "0x%04llx\n");
static int pmbus_init_debugfs(struct i2c_client *client,
struct pmbus_data *data)
{
int i, idx = 0;
char name[PMBUS_NAME_SIZE];
struct pmbus_debugfs_entry *entries;
if (!pmbus_debugfs_dir)
return -ENODEV;
/*
* 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)) {
/* No need to set reg as we have special read op. */
entries[idx].client = client;
entries[idx].page = i;
scnprintf(name, PMBUS_NAME_SIZE, "status%d", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops_status);
}
if (data->info->func[i] & PMBUS_HAVE_STATUS_VOUT) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_VOUT;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_vout", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (data->info->func[i] & PMBUS_HAVE_STATUS_IOUT) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_IOUT;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_iout", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (data->info->func[i] & PMBUS_HAVE_STATUS_INPUT) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_INPUT;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_input", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (data->info->func[i] & PMBUS_HAVE_STATUS_TEMP) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_TEMPERATURE;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_temp", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (pmbus_check_byte_register(client, i, PMBUS_STATUS_CML)) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_CML;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_cml", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (pmbus_check_byte_register(client, i, PMBUS_STATUS_OTHER)) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_OTHER;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_other", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (pmbus_check_byte_register(client, i,
PMBUS_STATUS_MFR_SPECIFIC)) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_MFR_SPECIFIC;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_mfr", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN12) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_FAN_12;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan12", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN34) {
entries[idx].client = client;
entries[idx].page = i;
entries[idx].reg = PMBUS_STATUS_FAN_34;
scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan34", i);
debugfs_create_file(name, 0444, data->debugfs,
&entries[idx++],
&pmbus_debugfs_ops);
}
}
return 0;
}
#else
static int pmbus_init_debugfs(struct i2c_client *client,
struct pmbus_data *data)
{
return 0;
}
#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
struct pmbus_driver_info *info)
{
@ -1952,6 +2138,10 @@ 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:
@ -1965,12 +2155,32 @@ EXPORT_SYMBOL_GPL(pmbus_do_probe);
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;
}
EXPORT_SYMBOL_GPL(pmbus_do_remove);
static int __init pmbus_core_init(void)
{
pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);
if (IS_ERR(pmbus_debugfs_dir))
pmbus_debugfs_dir = NULL;
return 0;
}
static void __exit pmbus_core_exit(void)
{
debugfs_remove_recursive(pmbus_debugfs_dir);
}
module_init(pmbus_core_init);
module_exit(pmbus_core_exit);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus core driver");
MODULE_LICENSE("GPL");