/*-
 * Copyright (c) 2013 Adrian Chadd <adrian@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
 *    redistribution must be conditioned upon including a substantially
 *    similar Disclaimer requirement for further binary redistribution.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGES.
 *
 * $FreeBSD$
 */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * This implements some very basic bluetooth coexistence methods for
 * the ath(4) hardware.
 */
#include "opt_ath.h"
#include "opt_inet.h"
#include "opt_wlan.h"

#include <sys/param.h>
#include <sys/systm.h> 
#include <sys/sysctl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/errno.h>

#if defined(__DragonFly__)
/* empty */
#else
#include <machine/bus.h>
#include <machine/resource.h>
#endif
#include <sys/bus.h>

#include <sys/socket.h>
 
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#include <net/ethernet.h>               /* XXX for ether_sprintf */

#include <netproto/802_11/ieee80211_var.h>

#include <net/bpf.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif

#include <dev/netif/ath/ath/if_athvar.h>
#include <dev/netif/ath/ath/if_ath_btcoex.h>

/*
 * Initial AR9285 / (WB195) bluetooth coexistence settings,
 * just for experimentation.
 *
 * Return 0 for OK; errno for error.
 *
 * XXX TODO: There needs to be a PCIe workaround to disable ASPM if
 * bluetooth coexistence is enabled.
 */
static int
ath_btcoex_cfg_wb195(struct ath_softc *sc)
{
        HAL_BT_COEX_INFO btinfo;
        HAL_BT_COEX_CONFIG btconfig;
        struct ath_hal *ah = sc->sc_ah;

        if (! ath_hal_btcoex_supported(ah))
                return (EINVAL);

        bzero(&btinfo, sizeof(btinfo));
        bzero(&btconfig, sizeof(btconfig));

        device_printf(sc->sc_dev, "Enabling WB195 BTCOEX\n");

        btinfo.bt_module = HAL_BT_MODULE_JANUS;
        btinfo.bt_coex_config = HAL_BT_COEX_CFG_3WIRE;
        /*
         * These are the three GPIO pins hooked up between the AR9285 and
         * the AR3011.
         */
        btinfo.bt_gpio_bt_active = 6;
        btinfo.bt_gpio_bt_priority = 7;
        btinfo.bt_gpio_wlan_active = 5;
        btinfo.bt_active_polarity = 1;  /* XXX not used */
        btinfo.bt_single_ant = 1;       /* 1 antenna on ar9285 ? */
        btinfo.bt_isolation = 0;        /* in dB, not used */

        ath_hal_btcoex_set_info(ah, &btinfo);

        btconfig.bt_time_extend = 0;
        btconfig.bt_txstate_extend = 1; /* true */
        btconfig.bt_txframe_extend = 1; /* true */
        btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
        btconfig.bt_quiet_collision = 1;        /* true */
        btconfig.bt_rxclear_polarity = 1;       /* true */
        btconfig.bt_priority_time = 2;
        btconfig.bt_first_slot_time = 5;
        btconfig.bt_hold_rxclear = 1;   /* true */

        ath_hal_btcoex_set_config(ah, &btconfig);

        /*
         * Enable antenna diversity.
         */
        ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY, 1);

        return (0);
}

/*
 * Initial AR9485 / (WB225) bluetooth coexistence settings,
 * just for experimentation.
 *
 * Return 0 for OK; errno for error.
 */
static int
ath_btcoex_cfg_wb225(struct ath_softc *sc)
{
        HAL_BT_COEX_INFO btinfo;
        HAL_BT_COEX_CONFIG btconfig;
        struct ath_hal *ah = sc->sc_ah;

        if (! ath_hal_btcoex_supported(ah))
                return (EINVAL);

        bzero(&btinfo, sizeof(btinfo));
        bzero(&btconfig, sizeof(btconfig));

        device_printf(sc->sc_dev, "Enabling WB225 BTCOEX\n");

        btinfo.bt_module = HAL_BT_MODULE_JANUS; /* XXX not used? */
        btinfo.bt_coex_config = HAL_BT_COEX_CFG_3WIRE;
        /*
         * These are the three GPIO pins hooked up between the AR9485 and
         * the bluetooth module.
         */
        btinfo.bt_gpio_bt_active = 4;
        btinfo.bt_gpio_bt_priority = 8;
        btinfo.bt_gpio_wlan_active = 5;

        btinfo.bt_active_polarity = 1;  /* XXX not used */
        btinfo.bt_single_ant = 1;       /* 1 antenna on ar9285 ? */
        btinfo.bt_isolation = 0;        /* in dB, not used */

        ath_hal_btcoex_set_info(ah, &btinfo);

        btconfig.bt_time_extend = 0;
        btconfig.bt_txstate_extend = 1; /* true */
        btconfig.bt_txframe_extend = 1; /* true */
        btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
        btconfig.bt_quiet_collision = 1;        /* true */
        btconfig.bt_rxclear_polarity = 1;       /* true */
        btconfig.bt_priority_time = 2;
        btconfig.bt_first_slot_time = 5;
        btconfig.bt_hold_rxclear = 1;   /* true */

        ath_hal_btcoex_set_config(ah, &btconfig);

        /*
         * Enable antenna diversity.
         */
        ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY, 1);

        return (0);
}

/*
 * Initial AR9462 / (WB222) bluetooth coexistence settings,
 * just for experimentation.
 *
 * Return 0 for OK; errno for error.
 */
static int
ath_btcoex_cfg_wb222(struct ath_softc *sc)
{
        HAL_BT_COEX_INFO btinfo;
        HAL_BT_COEX_CONFIG btconfig;
        struct ath_hal *ah = sc->sc_ah;

        if (! ath_hal_btcoex_supported(ah))
                return (EINVAL);

        bzero(&btinfo, sizeof(btinfo));
        bzero(&btconfig, sizeof(btconfig));

        device_printf(sc->sc_dev, "Enabling WB222 BTCOEX\n");

        btinfo.bt_module = HAL_BT_MODULE_JANUS; /* XXX not used? */
        btinfo.bt_coex_config = HAL_BT_COEX_CFG_MCI;

        /*
         * MCI uses a completely different interface to speak
         * to the bluetooth module - it's a command based
         * thing over a serial line, rather than
         * state pins to/from the bluetooth module.
         *
         * So, the GPIO configuration, polarity, etc
         * doesn't matter on MCI devices; it's just
         * completely ignored by the HAL.
         */
        btinfo.bt_gpio_bt_active = 4;
        btinfo.bt_gpio_bt_priority = 8;
        btinfo.bt_gpio_wlan_active = 5;

        btinfo.bt_active_polarity = 1;  /* XXX not used */
        btinfo.bt_single_ant = 0;       /* 2 antenna on WB222 */
        btinfo.bt_isolation = 0;        /* in dB, not used */

        ath_hal_btcoex_set_info(ah, &btinfo);

        btconfig.bt_time_extend = 0;
        btconfig.bt_txstate_extend = 1; /* true */
        btconfig.bt_txframe_extend = 1; /* true */
        btconfig.bt_mode = HAL_BT_COEX_MODE_SLOTTED;
        btconfig.bt_quiet_collision = 1;        /* true */
        btconfig.bt_rxclear_polarity = 1;       /* true */
        btconfig.bt_priority_time = 2;
        btconfig.bt_first_slot_time = 5;
        btconfig.bt_hold_rxclear = 1;   /* true */

        ath_hal_btcoex_set_config(ah, &btconfig);

        /*
         * Enable antenna diversity.
         */
        ath_hal_btcoex_set_parameter(ah, HAL_BT_COEX_ANTENNA_DIVERSITY, 1);

        return (0);
}




#if 0
/*
 * When using bluetooth coexistence, ASPM needs to be disabled
 * otherwise the sleeping interferes with the bluetooth (USB)
 * operation and the MAC sleep/wakeup hardware.
 *
 * The PCIe powersave routine also needs to not be called
 * by the driver during suspend/resume, else things will get
 * a little odd.  Check Linux ath9k for more details.
 */
static int
ath_btcoex_aspm_wb195(struct ath_softc *sc)
{

        /* XXX TODO: clear device ASPM L0S and L1 */
        /* XXX TODO: clear _parent_ ASPM L0S and L1 */
}
#endif

/*
 * Methods which are required
 */

/*
 * Attach btcoex to the given interface
 */
int
ath_btcoex_attach(struct ath_softc *sc)
{
        int ret;
        struct ath_hal *ah = sc->sc_ah;
        const char *profname;

        /*
         * No chipset bluetooth coexistence? Then do nothing.
         */
        if (! ath_hal_btcoex_supported(ah))
                return (0);

        /*
         * Look at the hints to determine which bluetooth
         * profile to configure.
         */
        ret = resource_string_value(device_get_name(sc->sc_dev),
            device_get_unit(sc->sc_dev),
            "btcoex_profile",
            &profname);
        if (ret != 0) {
                /* nothing to do */
                return (0);
        }

        if (strncmp(profname, "wb195", 5) == 0) {
                ret = ath_btcoex_cfg_wb195(sc);
        } else if (strncmp(profname, "wb222", 5) == 0) {
                ret = ath_btcoex_cfg_wb222(sc);
        } else if (strncmp(profname, "wb225", 5) == 0) {
                ret = ath_btcoex_cfg_wb225(sc);
        } else {
                return (0);
        }

        /*
         * Propagate up failure from the actual attach phase.
         */
        if (ret != 0)
                return (ret);

        return (0);
}

/*
 * Detach btcoex from the given interface
 */
int
ath_btcoex_detach(struct ath_softc *sc)
{

        return (0);
}

/*
 * Configure or disable bluetooth coexistence on the given channel.
 *
 * For AR9285/AR9287/AR9485, we'll never see a 5GHz channel, so we just
 * assume bluetooth coexistence is always on.
 *
 * For AR9462, we may see a 5GHz channel; bluetooth coexistence should
 * not be enabled on those channels.
 */
int
ath_btcoex_enable(struct ath_softc *sc, const struct ieee80211_channel *chan)
{

        return (0);
}

/*
 * Handle ioctl requests from the diagnostic interface.
 *
 * The initial part of this code resembles ath_ioctl_diag();
 * it's likely a good idea to reduce duplication between
 * these two routines.
 */
int
ath_btcoex_ioctl(struct ath_softc *sc, struct ath_diag *ad)
{
        unsigned int id = ad->ad_id & ATH_DIAG_ID;
        void *indata = NULL;
        void *outdata = NULL;
        u_int32_t insize = ad->ad_in_size;
        u_int32_t outsize = ad->ad_out_size;
        int error = 0;
//      int val;

        if (ad->ad_id & ATH_DIAG_IN) {
                /*
                 * Copy in data.
                 */
                indata = kmalloc(insize, M_TEMP, M_INTWAIT);
                if (indata == NULL) {
                        error = ENOMEM;
                        goto bad;
                }
                error = copyin(ad->ad_in_data, indata, insize);
                if (error)
                        goto bad;
        }
        if (ad->ad_id & ATH_DIAG_DYN) {
                /*
                 * Allocate a buffer for the results (otherwise the HAL
                 * returns a pointer to a buffer where we can read the
                 * results).  Note that we depend on the HAL leaving this
                 * pointer for us to use below in reclaiming the buffer;
                 * may want to be more defensive.
                 */
                outdata = kmalloc(outsize, M_TEMP, M_INTWAIT);
                if (outdata == NULL) {
                        error = ENOMEM;
                        goto bad;
                }
        }
        switch (id) {
                default:
                        error = EINVAL;
        }
        if (outsize < ad->ad_out_size)
                ad->ad_out_size = outsize;
        if (outdata && copyout(outdata, ad->ad_out_data, ad->ad_out_size))
                error = EFAULT;
bad:
        if ((ad->ad_id & ATH_DIAG_IN) && indata != NULL)
                kfree(indata, M_TEMP);
        if ((ad->ad_id & ATH_DIAG_DYN) && outdata != NULL)
                kfree(outdata, M_TEMP);
        return (error);
}