diff options
Diffstat (limited to 'drivers/hwmon/pmbus/pmbus_core.c')
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 80 |
1 files changed, 52 insertions, 28 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 32f4530cd1e8..cb5e255a84c6 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -109,6 +109,7 @@ struct pmbus_data { * so we keep them all together. */ u8 status[PB_NUM_STATUS_REG]; + u8 status_register; u8 currpage; }; @@ -285,9 +286,10 @@ EXPORT_SYMBOL_GPL(pmbus_clear_faults); static int pmbus_check_status_cml(struct i2c_client *client) { + struct pmbus_data *data = i2c_get_clientdata(client); int status, status2; - status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_BYTE); + status = _pmbus_read_byte_data(client, -1, data->status_register); if (status < 0 || (status & PB_STATUS_CML)) { status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML); if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND)) @@ -344,7 +346,7 @@ static struct pmbus_data *pmbus_update_device(struct device *dev) for (i = 0; i < info->pages; i++) data->status[PB_STATUS_BASE + i] = _pmbus_read_byte_data(client, i, - PMBUS_STATUS_BYTE); + data->status_register); for (i = 0; i < info->pages; i++) { if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT)) continue; @@ -1015,7 +1017,7 @@ static int pmbus_add_sensor_attrs_one(struct i2c_client *client, */ if (!ret && attr->gbit && pmbus_check_byte_register(client, page, - PMBUS_STATUS_BYTE)) { + data->status_register)) { ret = pmbus_add_boolean(data, name, "alarm", index, NULL, NULL, PB_STATUS_BASE + page, @@ -1683,6 +1685,51 @@ static int pmbus_identify_common(struct i2c_client *client, return 0; } +static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data, + struct pmbus_driver_info *info) +{ + struct device *dev = &client->dev; + int ret; + + /* + * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try + * to use PMBUS_STATUS_WORD instead if that is the case. + * Bail out if both registers are not supported. + */ + data->status_register = PMBUS_STATUS_BYTE; + ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE); + if (ret < 0 || ret == 0xff) { + data->status_register = PMBUS_STATUS_WORD; + ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD); + if (ret < 0 || ret == 0xffff) { + dev_err(dev, "PMBus status register not found\n"); + return -ENODEV; + } + } + + pmbus_clear_faults(client); + + if (info->identify) { + ret = (*info->identify)(client, info); + if (ret < 0) { + dev_err(dev, "Chip identification failed\n"); + return ret; + } + } + + if (info->pages <= 0 || info->pages > PMBUS_PAGES) { + dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages); + return -ENODEV; + } + + ret = pmbus_identify_common(client, data); + if (ret < 0) { + dev_err(dev, "Failed to identify chip capabilities\n"); + return ret; + } + return 0; +} + int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, struct pmbus_driver_info *info) { @@ -1707,36 +1754,13 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, mutex_init(&data->update_lock); data->dev = dev; - /* Bail out if PMBus status register does not exist. */ - if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) { - dev_err(dev, "PMBus status register not found\n"); - return -ENODEV; - } - if (pdata) data->flags = pdata->flags; data->info = info; - pmbus_clear_faults(client); - - if (info->identify) { - ret = (*info->identify)(client, info); - if (ret < 0) { - dev_err(dev, "Chip identification failed\n"); - return ret; - } - } - - if (info->pages <= 0 || info->pages > PMBUS_PAGES) { - dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages); - return -ENODEV; - } - - ret = pmbus_identify_common(client, data); - if (ret < 0) { - dev_err(dev, "Failed to identify chip capabilities\n"); + ret = pmbus_init_common(client, data, info); + if (ret < 0) return ret; - } ret = pmbus_find_attributes(client, data); if (ret) |