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path: root/drivers/media/dvb/dvb-usb/dib0700_core.c
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/* Linux driver for devices based on the DiBcom DiB0700 USB bridge
 *
 *	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.
 *
 *  Copyright (C) 2005-6 DiBcom, SA
 */
#include "dib0700.h"

/* debug */
int dvb_usb_dib0700_debug;
module_param_named(debug,dvb_usb_dib0700_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=info,2=fw,4=fwdata,8=data (or-able))." DVB_USB_DEBUG_STATUS);

int dvb_usb_dib0700_ir_proto = 1;
module_param(dvb_usb_dib0700_ir_proto, int, 0644);
MODULE_PARM_DESC(dvb_usb_dib0700_ir_proto, "set ir protocol (0=NEC, 1=RC5 (default), 2=RC6).");

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

/* expecting rx buffer: request data[0] data[1] ... data[2] */
static int dib0700_ctrl_wr(struct dvb_usb_device *d, u8 *tx, u8 txlen)
{
	int status;

	deb_data(">>> ");
	debug_dump(tx,txlen,deb_data);

	status = usb_control_msg(d->udev, usb_sndctrlpipe(d->udev,0),
		tx[0], USB_TYPE_VENDOR | USB_DIR_OUT, 0, 0, tx, txlen,
		USB_CTRL_GET_TIMEOUT);

	if (status != txlen)
		deb_data("ep 0 write error (status = %d, len: %d)\n",status,txlen);

	return status < 0 ? status : 0;
}

/* expecting tx buffer: request data[0] ... data[n] (n <= 4) */
int dib0700_ctrl_rd(struct dvb_usb_device *d, u8 *tx, u8 txlen, u8 *rx, u8 rxlen)
{
	u16 index, value;
	int status;

	if (txlen < 2) {
		err("tx buffer length is smaller than 2. Makes no sense.");
		return -EINVAL;
	}
	if (txlen > 4) {
		err("tx buffer length is larger than 4. Not supported.");
		return -EINVAL;
	}

	deb_data(">>> ");
	debug_dump(tx,txlen,deb_data);

	value = ((txlen - 2) << 8) | tx[1];
	index = 0;
	if (txlen > 2)
		index |= (tx[2] << 8);
	if (txlen > 3)
		index |= tx[3];

	status = usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev,0), tx[0],
			USB_TYPE_VENDOR | USB_DIR_IN, value, index, rx, rxlen,
			USB_CTRL_GET_TIMEOUT);

	if (status < 0)
		deb_info("ep 0 read error (status = %d)\n",status);

	deb_data("<<< ");
	debug_dump(rx,rxlen,deb_data);

	return status; /* length in case of success */
}

int dib0700_set_gpio(struct dvb_usb_device *d, enum dib07x0_gpios gpio, u8 gpio_dir, u8 gpio_val)
{
	u8 buf[3] = { REQUEST_SET_GPIO, gpio, ((gpio_dir & 0x01) << 7) | ((gpio_val & 0x01) << 6) };
	return dib0700_ctrl_wr(d,buf,3);
}

/*
 * I2C master xfer function (supported in 1.20 firmware)
 */
static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
				int num)
{
	/* The new i2c firmware messages are more reliable and in particular
	   properly support i2c read calls not preceded by a write */

	struct dvb_usb_device *d = i2c_get_adapdata(adap);
	uint8_t bus_mode = 1;  /* 0=eeprom bus, 1=frontend bus */
	uint8_t gen_mode = 0; /* 0=master i2c, 1=gpio i2c */
	uint8_t en_start = 0;
	uint8_t en_stop = 0;
	uint8_t buf[255]; /* TBV: malloc ? */
	int result, i;

	/* Ensure nobody else hits the i2c bus while we're sending our
	   sequence of messages, (such as the remote control thread) */
	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
		return -EAGAIN;

	for (i = 0; i < num; i++) {
		if (i == 0) {
			/* First message in the transaction */
			en_start = 1;
		} else if (!(msg[i].flags & I2C_M_NOSTART)) {
			/* Device supports repeated-start */
			en_start = 1;
		} else {
			/* Not the first packet and device doesn't support
			   repeated start */
			en_start = 0;
		}
		if (i == (num - 1)) {
			/* Last message in the transaction */
			en_stop = 1;
		}

		if (msg[i].flags & I2C_M_RD) {
			/* Read request */
			u16 index, value;
			uint8_t i2c_dest;

			i2c_dest = (msg[i].addr << 1);
			value = ((en_start << 7) | (en_stop << 6) |
				 (msg[i].len & 0x3F)) << 8 | i2c_dest;
			/* I2C ctrl + FE bus; */
			index = ((gen_mode<<6)&0xC0) | ((bus_mode<<4)&0x30);

			result = usb_control_msg(d->udev,
						 usb_rcvctrlpipe(d->udev, 0),
						 REQUEST_NEW_I2C_READ,
						 USB_TYPE_VENDOR | USB_DIR_IN,
						 value, index, msg[i].buf,
						 msg[i].len,
						 USB_CTRL_GET_TIMEOUT);
			if (result < 0) {
				err("i2c read error (status = %d)\n", result);
				break;
			}
		} else {
			/* Write request */
			buf[0] = REQUEST_NEW_I2C_WRITE;
			buf[1] = (msg[i].addr << 1);
			buf[2] = (en_start << 7) | (en_stop << 6) |
				(msg[i].len & 0x3F);
			/* I2C ctrl + FE bus; */
			buf[3] = ((gen_mode<<6)&0xC0) | ((bus_mode<<4)&0x30);
			/* The Actual i2c payload */
			memcpy(&buf[4], msg[i].buf, msg[i].len);

			result = usb_control_msg(d->udev,
						 usb_sndctrlpipe(d->udev, 0),
						 REQUEST_NEW_I2C_WRITE,
						 USB_TYPE_VENDOR | USB_DIR_OUT,
						 0, 0, buf, msg[i].len + 4,
						 USB_CTRL_GET_TIMEOUT);
			if (result < 0) {
				err("i2c write error (status = %d)\n", result);
				break;
			}
		}
	}
	mutex_unlock(&d->i2c_mutex);
	return i;
}

/*
 * I2C master xfer function (pre-1.20 firmware)
 */
static int dib0700_i2c_xfer_legacy(struct i2c_adapter *adap,
				   struct i2c_msg *msg, int num)
{
	struct dvb_usb_device *d = i2c_get_adapdata(adap);
	int i,len;
	u8 buf[255];

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

	for (i = 0; i < num; i++) {
		/* fill in the address */
		buf[1] = (msg[i].addr << 1);
		/* fill the buffer */
		memcpy(&buf[2], msg[i].buf, msg[i].len);

		/* write/read request */
		if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
			buf[0] = REQUEST_I2C_READ;
			buf[1] |= 1;

			/* special thing in the current firmware: when length is zero the read-failed */
			if ((len = dib0700_ctrl_rd(d, buf, msg[i].len + 2, msg[i+1].buf, msg[i+1].len)) <= 0) {
				deb_info("I2C read failed on address %x\n", msg[i].addr);
				break;
			}

			msg[i+1].len = len;

			i++;
		} else {
			buf[0] = REQUEST_I2C_WRITE;
			if (dib0700_ctrl_wr(d, buf, msg[i].len +