/******************************************************************************
 *
 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that 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.
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <net/mac80211.h>
#include <linux/etherdevice.h>
#include <asm/unaligned.h>
#include "iwl-io.h"
#include "iwl-trans.h"
#include "iwl-modparams.h"
#include "dev.h"
#include "agn.h"

/* Throughput           OFF time(ms)    ON time (ms)
 *      >300                    25              25
 *      >200 to 300             40              40
 *      >100 to 200             55              55
 *      >70 to 100              65              65
 *      >50 to 70               75              75
 *      >20 to 50               85              85
 *      >10 to 20               95              95
 *      >5 to 10                110             110
 *      >1 to 5                 130             130
 *      >0 to 1                 167             167
 *      <=0                                     SOLID ON
 */
static const struct ieee80211_tpt_blink iwl_blink[] = {
        { .throughput = 0, .blink_time = 334 },
        { .throughput = 1 * 1024 - 1, .blink_time = 260 },
        { .throughput = 5 * 1024 - 1, .blink_time = 220 },
        { .throughput = 10 * 1024 - 1, .blink_time = 190 },
        { .throughput = 20 * 1024 - 1, .blink_time = 170 },
        { .throughput = 50 * 1024 - 1, .blink_time = 150 },
        { .throughput = 70 * 1024 - 1, .blink_time = 130 },
        { .throughput = 100 * 1024 - 1, .blink_time = 110 },
        { .throughput = 200 * 1024 - 1, .blink_time = 80 },
        { .throughput = 300 * 1024 - 1, .blink_time = 50 },
};

/* Set led register off */
void iwlagn_led_enable(struct iwl_priv *priv)
{
        iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
}

/*
 * Adjust led blink rate to compensate on a MAC Clock difference on every HW
 * Led blink rate analysis showed an average deviation of 20% on 5000 series
 * and up.
 * Need to compensate on the led on/off time per HW according to the deviation
 * to achieve the desired led frequency
 * The calculation is: (100-averageDeviation)/100 * blinkTime
 * For code efficiency the calculation will be:
 *     compensation = (100 - averageDeviation) * 64 / 100
 *     NewBlinkTime = (compensation * BlinkTime) / 64
 */
static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
                                    u8 time, u16 compensation)
{
        if (!compensation) {
                IWL_ERR(priv, "undefined blink compensation: "
                        "use pre-defined blinking time\n");
                return time;
        }

        return (u8)((time * compensation) >> 6);
}

static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
{
        struct iwl_host_cmd cmd = {
                .id = REPLY_LEDS_CMD,
                .len = { sizeof(struct iwl_led_cmd), },
                .data = { led_cmd, },
                .flags = CMD_ASYNC,
        };
        u32 reg;

        reg = iwl_read32(priv->trans, CSR_LED_REG);
        if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
                iwl_write32(priv->trans, CSR_LED_REG,
                            reg & CSR_LED_BSM_CTRL_MSK);

        return iwl_dvm_send_cmd(priv, &cmd);
}

/* Set led pattern command */
static int iwl_led_cmd(struct iwl_priv *priv,
                       unsigned long on,
                       unsigned long off)
{
        struct iwl_led_cmd led_cmd = {
                .id = IWL_LED_LINK,
                .interval = IWL_DEF_LED_INTRVL
        };
        int ret;

        if (!test_bit(STATUS_READY, &priv->status))
                return -EBUSY;

        if (priv->blink_on == on && priv->blink_off == off)
                return 0;

        if (off == 0) {
                /* led is SOLID_ON */
                on = IWL_LED_SOLID;
        }

        led_cmd.on = iwl_blink_compensation(priv, on,
                                priv->cfg->base_params->led_compensation);
        led_cmd.off = iwl_blink_compensation(priv, off,
                                priv->cfg->base_params->led_compensation);

        ret = iwl_send_led_cmd(priv, &led_cmd);
        if (!ret) {
                priv->blink_on = on;
                priv->blink_off = off;
        }
        return ret;
}

static void iwl_led_brightness_set(struct led_classdev *led_cdev,
                                   enum led_brightness brightness)
{
        struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
        unsigned long on = 0;
        unsigned long off = 0;

        if (brightness > 0)
                on = IWL_LED_SOLID;
        else
                off = IWL_LED_SOLID;

        iwl_led_cmd(priv, on, off);
}

static int iwl_led_blink_set(struct led_classdev *led_cdev,
                             unsigned long *delay_on,
                             unsigned long *delay_off)
{
        struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);

        return iwl_led_cmd(priv, *delay_on, *delay_off);
}

void iwl_leds_init(struct iwl_priv *priv)
{
        int mode = iwlwifi_mod_params.led_mode;
        int ret;

        if (mode == IWL_LED_DISABLE) {
                IWL_INFO(priv, "Led disabled\n");
                return;
        }
        if (mode == IWL_LED_DEFAULT)
                mode = priv->cfg->led_mode;

        priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
                                   wiphy_name(priv->hw->wiphy));
        priv->led.brightness_set = iwl_led_brightness_set;
        priv->led.blink_set = iwl_led_blink_set;
        priv->led.max_brightness = 1;

        switch (mode) {
        case IWL_LED_DEFAULT:
                WARN_ON(1);
                break;
        case IWL_LED_BLINK:
                priv->led.default_trigger =
                        ieee80211_create_tpt_led_trigger(priv->hw,
                                        IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
                                        iwl_blink, ARRAY_SIZE(iwl_blink));
                break;
        case IWL_LED_RF_STATE:
                priv->led.default_trigger =
                        ieee80211_get_radio_led_name(priv->hw);
                break;
        }

        ret = led_classdev_register(priv->trans->dev, &priv->led);
        if (ret) {
                kfree(priv->led.name);
                return;
        }

        priv->led_registered = true;
}

void iwl_leds_exit(struct iwl_priv *priv)
{
        if (!priv->led_registered)
                return;

        led_classdev_unregister(&priv->led);
        kfree(priv->led.name);
}