drivers/media/dvb/dvb-usb/cxusb.c - linux/kernel/git/mellanox/linux - Git at Google

 /* DVB USB compliant linux driver for Conexant USB reference design.
  *
  * The Conexant reference design I saw on their website was only for analogue
  * capturing (using the cx25842). The box I took to write this driver (reverse
  * engineered) is the one labeled Medion MD95700. In addition to the cx25842
  * for analogue capturing it also has a cx22702 DVB-T demodulator on the main
  * board. Besides it has a atiremote (X10) and a USB2.0 hub onboard.
  *
  * Maybe it is a little bit premature to call this driver cxusb, but I assume
  * the USB protocol is identical or at least inherited from the reference
  * design, so it can be reused for the "analogue-only" device (if it will
  * appear at all).
  *
  * TODO: check if the cx25840-driver (from ivtv) can be used for the analogue
  * part
  *
  * Copyright (C) 2005 Patrick Boettcher (patrick.boettcher@desy.de)
  *
  *	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 "cxusb.h"

 #include "cx22702.h"

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

 static int cxusb_ctrl_msg(struct dvb_usb_device *d,
 		u8 cmd, u8 *wbuf, int wlen, u8 *rbuf, int rlen)
 {
 	int wo = (rbuf == NULL || rlen == 0); /* write-only */
 	u8 sndbuf[1+wlen];
 	memset(sndbuf,0,1+wlen);

 	sndbuf[0] = cmd;
 	memcpy(&sndbuf[1],wbuf,wlen);
 	if (wo)
 		dvb_usb_generic_write(d,sndbuf,1+wlen);
 	else
 		dvb_usb_generic_rw(d,sndbuf,1+wlen,rbuf,rlen,0);

 	return 0;
 }

 /* GPIO */
 static void cxusb_gpio_tuner(struct dvb_usb_device *d, int onoff)
 {
 	struct cxusb_state *st = d->priv;
 	u8 o[2],i;

 	if (st->gpio_write_state[GPIO_TUNER] == onoff)
 		return;

 	o[0] = GPIO_TUNER;
 	o[1] = onoff;
 	cxusb_ctrl_msg(d,CMD_GPIO_WRITE,o,2,&i,1);

 	if (i != 0x01)
 		deb_info("gpio_write failed.\n");

 	st->gpio_write_state[GPIO_TUNER] = onoff;
 }

 /* I2C */
 static int cxusb_i2c_xfer(struct i2c_adapter *adap,struct i2c_msg msg[],int num)
 {
 	struct dvb_usb_device *d = i2c_get_adapdata(adap);
 	int i;

 	if (down_interruptible(&d->i2c_sem) < 0)
 		return -EAGAIN;

 	if (num > 2)
 		warn("more than 2 i2c messages at a time is not handled yet. TODO.");

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

 		switch (msg[i].addr) {
 			case 0x63:
 				cxusb_gpio_tuner(d,0);
 				break;
 			default:
 				cxusb_gpio_tuner(d,1);
 				break;
 		}

 		/* read request */
 		if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
 			u8 obuf[3+msg[i].len], ibuf[1+msg[i+1].len];
 			obuf[0] = msg[i].len;
 			obuf[1] = msg[i+1].len;
 			obuf[2] = msg[i].addr;
 			memcpy(&obuf[3],msg[i].buf,msg[i].len);

 			if (cxusb_ctrl_msg(d, CMD_I2C_READ,
 						obuf, 3+msg[i].len,
 						ibuf, 1+msg[i+1].len) < 0)
 				break;

 			if (ibuf[0] != 0x08)
 				deb_info("i2c read could have been failed\n");

 			memcpy(msg[i+1].buf,&ibuf[1],msg[i+1].len);

 			i++;
 		} else { /* write */
 			u8 obuf[2+msg[i].len], ibuf;
 			obuf[0] = msg[i].addr;
 			obuf[1] = msg[i].len;
 			memcpy(&obuf[2],msg[i].buf,msg[i].len);

 			if (cxusb_ctrl_msg(d,CMD_I2C_WRITE, obuf, 2+msg[i].len, &ibuf,1) < 0)
 				break;
 			if (ibuf != 0x08)
 				deb_info("i2c write could have been failed\n");
 		}
 	}

 	up(&d->i2c_sem);
 	return i;
 }

 static u32 cxusb_i2c_func(struct i2c_adapter *adapter)
 {
 	return I2C_FUNC_I2C;
 }

 static struct i2c_algorithm cxusb_i2c_algo = {
 	.master_xfer   = cxusb_i2c_xfer,
 	.functionality = cxusb_i2c_func,
 };

 static int cxusb_power_ctrl(struct dvb_usb_device *d, int onoff)
 {
 	u8 b = 0;
 	if (onoff)
 		return cxusb_ctrl_msg(d, CMD_POWER_ON, &b, 1, NULL, 0);
 	else
 		return cxusb_ctrl_msg(d, CMD_POWER_OFF, &b, 1, NULL, 0);
 }

 static int cxusb_streaming_ctrl(struct dvb_usb_device *d, int onoff)
 {
 	u8 buf[2] = { 0x03, 0x00 };
 	if (onoff)
 		cxusb_ctrl_msg(d,CMD_STREAMING_ON, buf, 2, NULL, 0);
 	else
 		cxusb_ctrl_msg(d,CMD_STREAMING_OFF, NULL, 0, NULL, 0);

 	return 0;
 }

 struct cx22702_config cxusb_cx22702_config = {
 	.demod_address = 0x63,

 	.output_mode = CX22702_PARALLEL_OUTPUT,

 	.pll_init = dvb_usb_pll_init_i2c,
 	.pll_set  = dvb_usb_pll_set_i2c,
 };

 /* Callbacks for DVB USB */
 static int cxusb_tuner_attach(struct dvb_usb_device *d)
 {
 	u8 bpll[4] = { 0x0b, 0xdc, 0x9c, 0xa0 };
 	d->pll_addr = 0x61;
 	memcpy(d->pll_init,bpll,4);
 	d->pll_desc = &dvb_pll_fmd1216me;
 	return 0;
 }

 static int cxusb_frontend_attach(struct dvb_usb_device *d)
 {
 	u8 b;
 	if (usb_set_interface(d->udev,0,6) < 0)
 		err("set interface failed");

 	cxusb_ctrl_msg(d,CMD_DIGITAL, NULL, 0, &b, 1);

 	if ((d->fe = cx22702_attach(&cxusb_cx22702_config, &d->i2c_adap)) != NULL)
 		return 0;

 	return -EIO;
 }

 /* DVB USB Driver stuff */
 static struct dvb_usb_properties cxusb_properties;

 static int cxusb_probe(struct usb_interface *intf,
 		const struct usb_device_id *id)
 {
 	return dvb_usb_device_init(intf,&cxusb_properties,THIS_MODULE,NULL);
 }

 static struct usb_device_id cxusb_table [] = {
 		{ USB_DEVICE(USB_VID_MEDION, USB_PID_MEDION_MD95700) },
 		{}		/* Terminating entry */
 };
 MODULE_DEVICE_TABLE (usb, cxusb_table);

 static struct dvb_usb_properties cxusb_properties = {
 	.caps = DVB_USB_IS_AN_I2C_ADAPTER,

 	.usb_ctrl = CYPRESS_FX2,

 	.size_of_priv     = sizeof(struct cxusb_state),

 	.streaming_ctrl   = cxusb_streaming_ctrl,
 	.power_ctrl       = cxusb_power_ctrl,
 	.frontend_attach  = cxusb_frontend_attach,
 	.tuner_attach     = cxusb_tuner_attach,

 	.i2c_algo         = &cxusb_i2c_algo,

 	.generic_bulk_ctrl_endpoint = 0x01,
 	/* parameter for the MPEG2-data transfer */
 	.urb = {
 		.type = DVB_USB_BULK,
 		.count = 5,
 		.endpoint = 0x02,
 		.u = {
 			.bulk = {
 				.buffersize = 8192,
 			}
 		}
 	},

 	.num_device_descs = 1,
 	.devices = {
 		{   "Medion MD95700 (MDUSBTV-HYBRID)",
 			{ NULL },
 			{ &cxusb_table[0], NULL },
 		},
 	}
 };

 static struct usb_driver cxusb_driver = {
 	.owner		= THIS_MODULE,
 	.name		= "dvb_usb_cxusb",
 	.probe		= cxusb_probe,
 	.disconnect = dvb_usb_device_exit,
 	.id_table	= cxusb_table,
 };

 /* module stuff */
 static int __init cxusb_module_init(void)
 {
 	int result;
 	if ((result = usb_register(&cxusb_driver))) {
 		err("usb_register failed. Error number %d",result);
 		return result;
 	}

 	return 0;
 }

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

 module_init (cxusb_module_init);
 module_exit (cxusb_module_exit);

 MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@desy.de>");
 MODULE_DESCRIPTION("Driver for Conexant USB2.0 hybrid reference design");
 MODULE_VERSION("1.0-alpha");
 MODULE_LICENSE("GPL");
	/* DVB USB compliant linux driver for Conexant USB reference design.
	*
	* The Conexant reference design I saw on their website was only for analogue
	* capturing (using the cx25842). The box I took to write this driver (reverse
	* engineered) is the one labeled Medion MD95700. In addition to the cx25842
	* for analogue capturing it also has a cx22702 DVB-T demodulator on the main
	* board. Besides it has a atiremote (X10) and a USB2.0 hub onboard.
	*
	* Maybe it is a little bit premature to call this driver cxusb, but I assume
	* the USB protocol is identical or at least inherited from the reference
	* design, so it can be reused for the "analogue-only" device (if it will
	* appear at all).
	*
	* TODO: check if the cx25840-driver (from ivtv) can be used for the analogue
	* part
	*
	* Copyright (C) 2005 Patrick Boettcher (patrick.boettcher@desy.de)
	*
	* 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 "cxusb.h"

	#include "cx22702.h"

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

	static int cxusb_ctrl_msg(struct dvb_usb_device *d,
	u8 cmd, u8 wbuf, int wlen, u8 rbuf, int rlen)
	{
	int wo = (rbuf == NULL \|\| rlen == 0); /* write-only */
	u8 sndbuf[1+wlen];
	memset(sndbuf,0,1+wlen);

	sndbuf[0] = cmd;
	memcpy(&sndbuf[1],wbuf,wlen);
	if (wo)
	dvb_usb_generic_write(d,sndbuf,1+wlen);
	else
	dvb_usb_generic_rw(d,sndbuf,1+wlen,rbuf,rlen,0);

	return 0;
	}

	/* GPIO */
	static void cxusb_gpio_tuner(struct dvb_usb_device *d, int onoff)
	{
	struct cxusb_state *st = d->priv;
	u8 o[2],i;

	if (st->gpio_write_state[GPIO_TUNER] == onoff)
	return;

	o[0] = GPIO_TUNER;
	o[1] = onoff;
	cxusb_ctrl_msg(d,CMD_GPIO_WRITE,o,2,&i,1);

	if (i != 0x01)
	deb_info("gpio_write failed.\n");

	st->gpio_write_state[GPIO_TUNER] = onoff;
	}

	/* I2C */
	static int cxusb_i2c_xfer(struct i2c_adapter *adap,struct i2c_msg msg[],int num)
	{
	struct dvb_usb_device *d = i2c_get_adapdata(adap);
	int i;

	if (down_interruptible(&d->i2c_sem) < 0)
	return -EAGAIN;

	if (num > 2)
	warn("more than 2 i2c messages at a time is not handled yet. TODO.");

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

	switch (msg[i].addr) {
	case 0x63:
	cxusb_gpio_tuner(d,0);
	break;
	default:
	cxusb_gpio_tuner(d,1);
	break;
	}

	/* read request */
	if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
	u8 obuf[3+msg[i].len], ibuf[1+msg[i+1].len];
	obuf[0] = msg[i].len;
	obuf[1] = msg[i+1].len;
	obuf[2] = msg[i].addr;
	memcpy(&obuf[3],msg[i].buf,msg[i].len);

	if (cxusb_ctrl_msg(d, CMD_I2C_READ,
	obuf, 3+msg[i].len,
	ibuf, 1+msg[i+1].len) < 0)
	break;

	if (ibuf[0] != 0x08)
	deb_info("i2c read could have been failed\n");

	memcpy(msg[i+1].buf,&ibuf[1],msg[i+1].len);

	i++;
	} else { /* write */
	u8 obuf[2+msg[i].len], ibuf;
	obuf[0] = msg[i].addr;
	obuf[1] = msg[i].len;
	memcpy(&obuf[2],msg[i].buf,msg[i].len);

	if (cxusb_ctrl_msg(d,CMD_I2C_WRITE, obuf, 2+msg[i].len, &ibuf,1) < 0)
	break;
	if (ibuf != 0x08)
	deb_info("i2c write could have been failed\n");
	}
	}

	up(&d->i2c_sem);
	return i;
	}

	static u32 cxusb_i2c_func(struct i2c_adapter *adapter)
	{
	return I2C_FUNC_I2C;
	}

	static struct i2c_algorithm cxusb_i2c_algo = {
	.master_xfer = cxusb_i2c_xfer,
	.functionality = cxusb_i2c_func,
	};

	static int cxusb_power_ctrl(struct dvb_usb_device *d, int onoff)
	{
	u8 b = 0;
	if (onoff)
	return cxusb_ctrl_msg(d, CMD_POWER_ON, &b, 1, NULL, 0);
	else
	return cxusb_ctrl_msg(d, CMD_POWER_OFF, &b, 1, NULL, 0);
	}

	static int cxusb_streaming_ctrl(struct dvb_usb_device *d, int onoff)
	{
	u8 buf[2] = { 0x03, 0x00 };
	if (onoff)
	cxusb_ctrl_msg(d,CMD_STREAMING_ON, buf, 2, NULL, 0);
	else
	cxusb_ctrl_msg(d,CMD_STREAMING_OFF, NULL, 0, NULL, 0);

	return 0;
	}

	struct cx22702_config cxusb_cx22702_config = {
	.demod_address = 0x63,

	.output_mode = CX22702_PARALLEL_OUTPUT,

	.pll_init = dvb_usb_pll_init_i2c,
	.pll_set = dvb_usb_pll_set_i2c,
	};

	/* Callbacks for DVB USB */
	static int cxusb_tuner_attach(struct dvb_usb_device *d)
	{
	u8 bpll[4] = { 0x0b, 0xdc, 0x9c, 0xa0 };
	d->pll_addr = 0x61;
	memcpy(d->pll_init,bpll,4);
	d->pll_desc = &dvb_pll_fmd1216me;
	return 0;
	}

	static int cxusb_frontend_attach(struct dvb_usb_device *d)
	{
	u8 b;
	if (usb_set_interface(d->udev,0,6) < 0)
	err("set interface failed");

	cxusb_ctrl_msg(d,CMD_DIGITAL, NULL, 0, &b, 1);

	if ((d->fe = cx22702_attach(&cxusb_cx22702_config, &d->i2c_adap)) != NULL)
	return 0;

	return -EIO;
	}

	/* DVB USB Driver stuff */
	static struct dvb_usb_properties cxusb_properties;

	static int cxusb_probe(struct usb_interface *intf,
	const struct usb_device_id *id)
	{
	return dvb_usb_device_init(intf,&cxusb_properties,THIS_MODULE,NULL);
	}

	static struct usb_device_id cxusb_table [] = {
	{ USB_DEVICE(USB_VID_MEDION, USB_PID_MEDION_MD95700) },
	{} /* Terminating entry */
	};
	MODULE_DEVICE_TABLE (usb, cxusb_table);

	static struct dvb_usb_properties cxusb_properties = {
	.caps = DVB_USB_IS_AN_I2C_ADAPTER,

	.usb_ctrl = CYPRESS_FX2,

	.size_of_priv = sizeof(struct cxusb_state),

	.streaming_ctrl = cxusb_streaming_ctrl,
	.power_ctrl = cxusb_power_ctrl,
	.frontend_attach = cxusb_frontend_attach,
	.tuner_attach = cxusb_tuner_attach,

	.i2c_algo = &cxusb_i2c_algo,

	.generic_bulk_ctrl_endpoint = 0x01,
	/* parameter for the MPEG2-data transfer */
	.urb = {
	.type = DVB_USB_BULK,
	.count = 5,
	.endpoint = 0x02,
	.u = {
	.bulk = {
	.buffersize = 8192,
	}
	}
	},

	.num_device_descs = 1,
	.devices = {
	{ "Medion MD95700 (MDUSBTV-HYBRID)",
	{ NULL },
	{ &cxusb_table[0], NULL },
	},
	}
	};

	static struct usb_driver cxusb_driver = {
	.owner = THIS_MODULE,
	.name = "dvb_usb_cxusb",
	.probe = cxusb_probe,
	.disconnect = dvb_usb_device_exit,
	.id_table = cxusb_table,
	};

	/* module stuff */
	static int __init cxusb_module_init(void)
	{
	int result;
	if ((result = usb_register(&cxusb_driver))) {
	err("usb_register failed. Error number %d",result);
	return result;
	}

	return 0;
	}

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

	module_init (cxusb_module_init);
	module_exit (cxusb_module_exit);

	MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@desy.de>");
	MODULE_DESCRIPTION("Driver for Conexant USB2.0 hybrid reference design");
	MODULE_VERSION("1.0-alpha");
	MODULE_LICENSE("GPL");