/* Intel(R) Gigabit Ethernet Linux driver
 * Copyright(c) 2007-2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 */

#include "igb.h"
#include "e1000_82575.h"
#include "e1000_hw.h"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/hwmon.h>
#include <linux/pci.h>

#ifdef CONFIG_IGB_HWMON
static struct i2c_board_info i350_sensor_info = {
        I2C_BOARD_INFO("i350bb", (0Xf8 >> 1)),
};

/* hwmon callback functions */
static ssize_t igb_hwmon_show_location(struct device *dev,
                                       struct device_attribute *attr,
                                       char *buf)
{
        struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
                                                   dev_attr);
        return sprintf(buf, "loc%u\n",
                       igb_attr->sensor->location);
}

static ssize_t igb_hwmon_show_temp(struct device *dev,
                                   struct device_attribute *attr,
                                   char *buf)
{
        struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
                                                   dev_attr);
        unsigned int value;

        /* reset the temp field */
        igb_attr->hw->mac.ops.get_thermal_sensor_data(igb_attr->hw);

        value = igb_attr->sensor->temp;

        /* display millidegree */
        value *= 1000;

        return sprintf(buf, "%u\n", value);
}

static ssize_t igb_hwmon_show_cautionthresh(struct device *dev,
                                            struct device_attribute *attr,
                                            char *buf)
{
        struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
                                                   dev_attr);
        unsigned int value = igb_attr->sensor->caution_thresh;

        /* display millidegree */
        value *= 1000;

        return sprintf(buf, "%u\n", value);
}

static ssize_t igb_hwmon_show_maxopthresh(struct device *dev,
                                          struct device_attribute *attr,
                                          char *buf)
{
        struct hwmon_attr *igb_attr = container_of(attr, struct hwmon_attr,
                                                   dev_attr);
        unsigned int value = igb_attr->sensor->max_op_thresh;

        /* display millidegree */
        value *= 1000;

        return sprintf(buf, "%u\n", value);
}

/* igb_add_hwmon_attr - Create hwmon attr table for a hwmon sysfs file.
 * @ adapter: pointer to the adapter structure
 * @ offset: offset in the eeprom sensor data table
 * @ type: type of sensor data to display
 *
 * For each file we want in hwmon's sysfs interface we need a device_attribute
 * This is included in our hwmon_attr struct that contains the references to
 * the data structures we need to get the data to display.
 */
static int igb_add_hwmon_attr(struct igb_adapter *adapter,
                              unsigned int offset, int type)
{
        int rc;
        unsigned int n_attr;
        struct hwmon_attr *igb_attr;

        n_attr = adapter->igb_hwmon_buff->n_hwmon;
        igb_attr = &adapter->igb_hwmon_buff->hwmon_list[n_attr];

        switch (type) {
        case IGB_HWMON_TYPE_LOC:
                igb_attr->dev_attr.show = igb_hwmon_show_location;
                snprintf(igb_attr->name, sizeof(igb_attr->name),
                         "temp%u_label", offset + 1);
                break;
        case IGB_HWMON_TYPE_TEMP:
                igb_attr->dev_attr.show = igb_hwmon_show_temp;
                snprintf(igb_attr->name, sizeof(igb_attr->name),
                         "temp%u_input", offset + 1);
                break;
        case IGB_HWMON_TYPE_CAUTION:
                igb_attr->dev_attr.show = igb_hwmon_show_cautionthresh;
                snprintf(igb_attr->name, sizeof(igb_attr->name),
                         "temp%u_max", offset + 1);
                break;
        case IGB_HWMON_TYPE_MAX:
                igb_attr->dev_attr.show = igb_hwmon_show_maxopthresh;
                snprintf(igb_attr->name, sizeof(igb_attr->name),
                         "temp%u_crit", offset + 1);
                break;
        default:
                rc = -EPERM;
                return rc;
        }

        /* These always the same regardless of type */
        igb_attr->sensor =
                &adapter->hw.mac.thermal_sensor_data.sensor[offset];
        igb_attr->hw = &adapter->hw;
        igb_attr->dev_attr.store = NULL;
        igb_attr->dev_attr.attr.mode = S_IRUGO;
        igb_attr->dev_attr.attr.name = igb_attr->name;
        sysfs_attr_init(&igb_attr->dev_attr.attr);

        adapter->igb_hwmon_buff->attrs[n_attr] = &igb_attr->dev_attr.attr;

        ++adapter->igb_hwmon_buff->n_hwmon;

        return 0;
}

static void igb_sysfs_del_adapter(struct igb_adapter *adapter)
{
}

/* called from igb_main.c */
void igb_sysfs_exit(struct igb_adapter *adapter)
{
        igb_sysfs_del_adapter(adapter);
}

/* called from igb_main.c */
int igb_sysfs_init(struct igb_adapter *adapter)
{
        struct hwmon_buff *igb_hwmon;
        struct i2c_client *client;
        struct device *hwmon_dev;
        unsigned int i;
        int rc = 0;

        /* If this method isn't defined we don't support thermals */
        if (adapter->hw.mac.ops.init_thermal_sensor_thresh == NULL)
                goto exit;

        /* Don't create thermal hwmon interface if no sensors present */
        rc = (adapter->hw.mac.ops.init_thermal_sensor_thresh(&adapter->hw));
        if (rc)
                goto exit;

        igb_hwmon = devm_kzalloc(&adapter->pdev->dev, sizeof(*igb_hwmon),
                                 GFP_KERNEL);
        if (!igb_hwmon) {
                rc = -ENOMEM;
                goto exit;
        }
        adapter->igb_hwmon_buff = igb_hwmon;

        for (i = 0; i < E1000_MAX_SENSORS; i++) {

                /* Only create hwmon sysfs entries for sensors that have
                 * meaningful data.
                 */
                if (adapter->hw.mac.thermal_sensor_data.sensor[i].location == 0)
                        continue;

                /* Bail if any hwmon attr struct fails to initialize */
                rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_CAUTION);
                if (rc)
                        goto exit;
                rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_LOC);
                if (rc)
                        goto exit;
                rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_TEMP);
                if (rc)
                        goto exit;
                rc = igb_add_hwmon_attr(adapter, i, IGB_HWMON_TYPE_MAX);
                if (rc)
                        goto exit;
        }

        /* init i2c_client */
        client = i2c_new_device(&adapter->i2c_adap, &i350_sensor_info);
        if (client == NULL) {
                dev_info(&adapter->pdev->dev,
                         "Failed to create new i2c device.\n");
                rc = -ENODEV;
                goto exit;
        }
        adapter->i2c_client = client;

        igb_hwmon->groups[0] = &igb_hwmon->group;
        igb_hwmon->group.attrs = igb_hwmon->attrs;

        hwmon_dev = devm_hwmon_device_register_with_groups(&adapter->pdev->dev,
                                                           client->name,
                                                           igb_hwmon,
                                                           igb_hwmon->groups);
        if (IS_ERR(hwmon_dev)) {
                rc = PTR_ERR(hwmon_dev);
                goto err;
        }

        goto exit;

err:
        igb_sysfs_del_adapter(adapter);
exit:
        return rc;
}
#endif