// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * DVB USB Linux driver for AME DTV-5100 USB2.0 DVB-T
 *
 * Copyright (C) 2008  Antoine Jacquet <royale@zerezo.com>
 * http://royale.zerezo.com/dtv5100/
 *
 * Inspired by gl861.c and au6610.c drivers
 */

#include "dtv5100.h"
#include "zl10353.h"
#include "qt1010.h"

/* debug */
static int dvb_usb_dtv5100_debug;
module_param_named(debug, dvb_usb_dtv5100_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level" DVB_USB_DEBUG_STATUS);
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

struct dtv5100_state {
        unsigned char data[80];
};

static int dtv5100_i2c_msg(struct dvb_usb_device *d, u8 addr,
                           u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
        struct dtv5100_state *st = d->priv;
        unsigned int pipe;
        u8 request;
        u8 type;
        u16 value;
        u16 index;

        switch (wlen) {
        case 1:
                /* write { reg }, read { value } */
                pipe = usb_rcvctrlpipe(d->udev, 0);
                request = (addr == DTV5100_DEMOD_ADDR ? DTV5100_DEMOD_READ :
                                                        DTV5100_TUNER_READ);
                type = USB_TYPE_VENDOR | USB_DIR_IN;
                value = 0;
                break;
        case 2:
                /* write { reg, value } */
                pipe = usb_sndctrlpipe(d->udev, 0);
                request = (addr == DTV5100_DEMOD_ADDR ? DTV5100_DEMOD_WRITE :
                                                        DTV5100_TUNER_WRITE);
                type = USB_TYPE_VENDOR | USB_DIR_OUT;
                value = wbuf[1];
                break;
        default:
                warn("wlen = %x, aborting.", wlen);
                return -EINVAL;
        }
        index = (addr << 8) + wbuf[0];

        if (rlen > sizeof(st->data)) {
                warn("rlen = %x is too big!\n", rlen);
                return -EINVAL;
        }

        memcpy(st->data, rbuf, rlen);
        msleep(1); /* avoid I2C errors */
        return usb_control_msg(d->udev, pipe, request,
                               type, value, index, st->data, rlen,
                               DTV5100_USB_TIMEOUT);
}

/* I2C */
static int dtv5100_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
                            int num)
{
        struct dvb_usb_device *d = i2c_get_adapdata(adap);
        int i;

        if (num > 2)
                return -EINVAL;

        if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
                return -EAGAIN;

        for (i = 0; i < num; i++) {
                /* write/read request */
                if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
                        if (dtv5100_i2c_msg(d, msg[i].addr, msg[i].buf,
                                            msg[i].len, msg[i+1].buf,
                                            msg[i+1].len) < 0)
                                break;
                        i++;
                } else if (dtv5100_i2c_msg(d, msg[i].addr, msg[i].buf,
                                           msg[i].len, NULL, 0) < 0)
                                break;
        }

        mutex_unlock(&d->i2c_mutex);
        return i;
}

static u32 dtv5100_i2c_func(struct i2c_adapter *adapter)
{
        return I2C_FUNC_I2C;
}

static const struct i2c_algorithm dtv5100_i2c_algo = {
        .master_xfer   = dtv5100_i2c_xfer,
        .functionality = dtv5100_i2c_func,
};

/* Callbacks for DVB USB */
static struct zl10353_config dtv5100_zl10353_config = {
        .demod_address = DTV5100_DEMOD_ADDR,
        .no_tuner = 1,
        .parallel_ts = 1,
};

static int dtv5100_frontend_attach(struct dvb_usb_adapter *adap)
{
        adap->fe_adap[0].fe = dvb_attach(zl10353_attach, &dtv5100_zl10353_config,
                              &adap->dev->i2c_adap);
        if (adap->fe_adap[0].fe == NULL)
                return -EIO;

        /* disable i2c gate, or it won't work... is this safe? */
        adap->fe_adap[0].fe->ops.i2c_gate_ctrl = NULL;

        return 0;
}

static struct qt1010_config dtv5100_qt1010_config = {
        .i2c_address = DTV5100_TUNER_ADDR
};

static int dtv5100_tuner_attach(struct dvb_usb_adapter *adap)
{
        return dvb_attach(qt1010_attach,
                          adap->fe_adap[0].fe, &adap->dev->i2c_adap,
                          &dtv5100_qt1010_config) == NULL ? -ENODEV : 0;
}

/* DVB USB Driver stuff */
static struct dvb_usb_device_properties dtv5100_properties;

static int dtv5100_probe(struct usb_interface *intf,
                         const struct usb_device_id *id)
{
        int i, ret;
        struct usb_device *udev = interface_to_usbdev(intf);

        /* initialize non qt1010/zl10353 part? */
        for (i = 0; dtv5100_init[i].request; i++) {
                ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                                      dtv5100_init[i].request,
                                      USB_TYPE_VENDOR | USB_DIR_OUT,
                                      dtv5100_init[i].value,
                                      dtv5100_init[i].index, NULL, 0,
                                      DTV5100_USB_TIMEOUT);
                if (ret)
                        return ret;
        }

        ret = dvb_usb_device_init(intf, &dtv5100_properties,
                                  THIS_MODULE, NULL, adapter_nr);
        if (ret)
                return ret;

        return 0;
}

enum {
        AME_DTV5100,
};

static const struct usb_device_id dtv5100_table[] = {
        DVB_USB_DEV(AME, AME_DTV5100),
        { }
};

MODULE_DEVICE_TABLE(usb, dtv5100_table);

static struct dvb_usb_device_properties dtv5100_properties = {
        .caps = DVB_USB_IS_AN_I2C_ADAPTER,
        .usb_ctrl = DEVICE_SPECIFIC,

        .size_of_priv = sizeof(struct dtv5100_state),

        .num_adapters = 1,
        .adapter = {{
                .num_frontends = 1,
                .fe = {{
                .frontend_attach = dtv5100_frontend_attach,
                .tuner_attach    = dtv5100_tuner_attach,

                .stream = {
                        .type = USB_BULK,
                        .count = 8,
                        .endpoint = 0x82,
                        .u = {
                                .bulk = {
                                        .buffersize = 4096,
                                }
                        }
                },
                }},
        } },

        .i2c_algo = &dtv5100_i2c_algo,

        .num_device_descs = 1,
        .devices = {
                {
                        .name = "AME DTV-5100 USB2.0 DVB-T",
                        .cold_ids = { NULL },
                        .warm_ids = { &dtv5100_table[AME_DTV5100], NULL },
                },
        }
};

static struct usb_driver dtv5100_driver = {
        .name           = "dvb_usb_dtv5100",
        .probe          = dtv5100_probe,
        .disconnect     = dvb_usb_device_exit,
        .id_table       = dtv5100_table,
};

module_usb_driver(dtv5100_driver);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");