drivers/media/dvb/dvb-usb/au6610.c

/* DVB USB compliant linux driver for Sigmatek DVB-110 DVB-T USB2.0 receiver
 *
 * Copyright (C) 2006 Antti Palosaari <crope@iki.fi>
 *
 *	This program is free software; you can redistribute it and/or modify it
 *	under the terms of the GNU General Public License as published by the Free
 *	Software Foundation, version 2.
 *
 * see Documentation/dvb/README.dvb-usb for more information
 */

#include "au6610.h"

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

/* debug */
static int dvb_usb_au6610_debug;
module_param_named(debug, dvb_usb_au6610_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=rc (or-able))." DVB_USB_DEBUG_STATUS);

static int au6610_usb_msg(struct dvb_usb_device *d, u8 operation, u8 addr,
			  u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
	int ret;
	u16 index;
	u8 usb_buf[6]; /* enough for all known requests, read returns 5 and write 6 bytes */

	switch (wlen) {
	case 1:
		index = wbuf[0] << 8;
		break;
	case 2:
		index = wbuf[0] << 8;
		index += wbuf[1];
		break;
	default:
		warn("wlen = %x, aborting.", wlen);
		return -EINVAL;
	}

	ret = usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev, 0), operation,
			      USB_TYPE_VENDOR | USB_DIR_IN, addr, index, usb_buf,
			      sizeof(usb_buf), AU6610_USB_TIMEOUT);

	if (ret < 0)
		return ret;

	switch (operation) {
	case AU6610_REQ_I2C_READ:
	case AU6610_REQ_USB_READ:
		/* requested value is always 5th byte in buffer */
		rbuf[0] = usb_buf[4];
	}

	return ret;
}

static int au6610_i2c_msg(struct dvb_usb_device *d, u8 addr, u8 *wbuf, u16 wlen, u8 *rbuf, u16 rlen)
{
	u8 request;
	u8 wo = (rbuf == NULL || rlen == 0); /* write-only */

	if (wo) {
		request = AU6610_REQ_I2C_WRITE;
	} else { /* rw */
		request = AU6610_REQ_I2C_READ;
	}

	return au6610_usb_msg(d, request, addr, wbuf, wlen, rbuf, rlen);
}


/* I2C */
static int au6610_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], int num)
{
	struct dvb_usb_device *d = i2c_get_adapdata(adap);
	int i;

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

	if (num > 2)
		return -EINVAL;

	for (i = 0; i < num; i++) {
		/* write/read request */
		if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
			if (au6610_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 (au6610_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 au6610_i2c_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C;
}

static struct i2c_algorithm au6610_i2c_algo = {
	.master_xfer   = au6610_i2c_xfer,
	.functionality = au6610_i2c_func,
};

/* Callbacks for DVB USB */
static int au6610_identify_state(struct usb_device *udev,
				 struct dvb_usb_device_properties *props,
				 struct dvb_usb_device_description **desc,
				 int *cold)
{
	*cold = 0;
	return 0;
}

static struct zl10353_config au6610_zl10353_config = {
	.demod_address = 0x1e,
	.no_tuner = 1,
	.parallel_ts = 1,
};

static int au6610_zl10353_frontend_attach(struct dvb_usb_adapter *adap)
{
	if ((adap->fe = dvb_attach(zl10353_attach, &au6610_zl10353_config,
				   &adap->dev->i2c_adap)) != NULL) {
		return 0;
	}

	return -EIO;
}

static struct qt1010_config au6610_qt1010_config = {
	.i2c_address = 0xc4
};

static int au6610_qt1010_tuner_attach(struct dvb_usb_adapter *adap)
{
	/* TODO FIXME; probably I2C gate.
	QT1010 tuner does not respond before we write 0x1a to ZL10353 demodulator
	register 0x62. This ought to be done somewhere in demodulator initialization.
	This solution is temporary hack. */
	u8 buf[2] = { 0x62, 0x1a };
	struct i2c_msg msg = {
		.addr = au6610_zl10353_config.demod_address, .flags = 0, .buf = buf, .len = 2
	};
	if (i2c_transfer(&adap->dev->i2c_adap, &msg, 1) != 1) {
		printk(KERN_WARNING "au6610 tuner attach failed\n");
		return -EREMOTEIO;
	}
	return dvb_attach(qt1010_attach,
			  adap->fe, &adap->dev->i2c_adap,
			  &au6610_qt1010_config) == NULL ? -ENODEV : 0;
}

/* DVB USB Driver stuff */
static struct dvb_usb_device_properties au6610_properties;

static int au6610_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct dvb_usb_device *d;
	struct usb_host_interface *alt;
	int ret;

	if (intf->num_altsetting < AU6610_ALTSETTING_COUNT)
		return -ENODEV;

	if ((ret = dvb_usb_device_init(intf, &au6610_properties, THIS_MODULE, &d)) == 0) {
		alt = usb_altnum_to_altsetting(intf, AU6610_ALTSETTING);

		if (alt == NULL) {
			deb_rc("no alt found!\n");
			return -ENODEV;
		}
		ret = usb_set_interface(d->udev, alt->desc.bInterfaceNumber,
					alt->desc.bAlternateSetting);
	}

	return ret;
}


static struct usb_device_id au6610_table [] = {
	{ USB_DEVICE(USB_VID_ALCOR_MICRO, USB_PID_SIGMATEK_DVB_110) },
	{ }		/* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, au6610_table);

static struct dvb_usb_device_properties au6610_properties = {
	.caps = DVB_USB_IS_AN_I2C_ADAPTER,
	.usb_ctrl = DEVICE_SPECIFIC,
	.size_of_priv     = 0,
	.identify_state   = au6610_identify_state,
	.num_adapters = 1,
	.adapter = {
		{
			.frontend_attach  = au6610_zl10353_frontend_attach,
			.tuner_attach     = au6610_qt1010_tuner_attach,

			.stream = {
				.type = USB_ISOC,
				.count = 5,
				.endpoint = 0x82,
				.u = {
					.isoc = {
						.framesperurb = 40,
						.framesize = 942,   /* maximum packet size */
						.interval = 1.25,   /* 125 us */
					}
				}
			},
		}
	},
	.i2c_algo = &au6610_i2c_algo,
	.num_device_descs = 1,
	.devices = {
		{
			"Sigmatek DVB-110 DVB-T USB2.0",
			{ &au6610_table[0], NULL },
			{ NULL },
		},
	}
};

static struct usb_driver au6610_driver = {
	.name       = "dvb_usb_au6610",
	.probe      = au6610_probe,
	.disconnect = dvb_usb_device_exit,
	.id_table   = au6610_table,
};

/* module stuff */
static int __init au6610_module_init(void)
{
	int ret;

	if ((ret = usb_register(&au6610_driver))) {
		err("usb_register failed. Error number %d", ret);
		return ret;
	}

	return 0;
}

static void __exit au6610_module_exit(void)
{
	/* deregister this driver from the USB subsystem */
	usb_deregister(&au6610_driver);
}

module_init (au6610_module_init);
module_exit (au6610_module_exit);

MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Driver Sigmatek DVB-110 DVB-T USB2.0 / AU6610");
MODULE_VERSION("0.1");
MODULE_LICENSE("GPL");