diff options
author | Edward A. James <eajames@us.ibm.com> | 2017-08-14 21:55:41 +0300 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2017-08-14 22:22:07 +0300 |
commit | 1e069dfd96dfeacf1d781f6eaea9426aed0b0909 (patch) | |
tree | cb12c48afdff1a072f1ffcb69cccac72448e50dc /drivers/hwmon | |
parent | f198907d2ff6db9541863764576aaf3bc9f58ec0 (diff) | |
download | linux-1e069dfd96dfeacf1d781f6eaea9426aed0b0909.tar.xz |
hwmon: (pmbus) Add debugfs for status registers
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>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index ef135d882be0..6ac89c93bd2e 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> @@ -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"); |