V4L/DVB (12923): SAA7164: Add support for the NXP SAA7164 silicon

This patch adds support for all of the known shipping Hauppauge HVR-2200
and HVR-2250 boards. Digital TV ATSC/QAM and DVB-T is enabled at this
time. Both tuners are supported.

Volatiles and typedefs need rework, the rest is coding style compliant.

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 619 insertions, 0 deletions

diff --git a/drivers/media/video/saa7164/saa7164-api.c b/drivers/media/video/saa7164/saa7164-api.c
new file mode 100644
index 000000000000..8cef1df9b54f
--- /dev/null
+++ b/drivers/media/video/saa7164/saa7164-api.c
@@ -0,0 +1,619 @@
+/*
+ *  Driver for the NXP SAA7164 PCIe bridge
+ *
+ *  Copyright (c) 2009 Steven Toth <stoth@kernellabs.com>
+ *
+ *  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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/wait.h>
+
+#include "saa7164.h"
+
+int saa7164_api_transition_port(struct saa7164_tsport *port, u8 mode)
+{
+	int ret;
+
+	ret = saa7164_cmd_send(port->dev, port->hwcfg.unitid, SET_CUR,
+		SAA_STATE_CONTROL, sizeof(mode), &mode);
+	if (ret != SAA_OK)
+		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);
+
+	return ret;
+}
+
+int saa7164_api_get_fw_version(struct saa7164_dev *dev, u32 *version)
+{
+	int ret;
+
+	ret = saa7164_cmd_send(dev, 0, GET_CUR,
+		GET_FW_VERSION_CONTROL, sizeof(u32), version);
+	if (ret != SAA_OK)
+		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);
+
+	return ret;
+}
+
+int saa7164_api_read_eeprom(struct saa7164_dev *dev, u8 *buf, int buflen)
+{
+	u8 reg[] = { 0x0f, 0x00 };
+
+	if (buflen < 128)
+		return -ENOMEM;
+
+	/* Assumption: Hauppauge eeprom is at 0xa0 on on bus 0 */
+	/* TODO: Pull the details from the boards struct */
+	return saa7164_api_i2c_read(&dev->i2c_bus[0], 0xa0 >> 1, sizeof(reg),
+		&reg[0], 128, buf);
+}
+
+/*  Exercise the i2c interface, saa7164_cmd()/bus() layers:
+ *  1. Read the identity byte from each of the demodulators.
+ *  2. Read the entire register set from the TDA18271.
+ *  TODO: This function has no purpose other than to exercise i2c.
+ */
+int saa7164_api_test(struct saa7164_dev *dev)
+{
+	/* TDA10048 identities */
+	u8 reg[] = { 0x00 };
+	u8 data[256];
+	dprintk(DBGLVL_API, "%s()\n", __func__);
+	/* Read all 39 bytes from the TDA18271 tuners */
+	saa7164_api_i2c_read(&dev->i2c_bus[1], 0xc0 >> 1, 0,
+		&reg[0], 39, &data[0]);
+	saa7164_api_i2c_read(&dev->i2c_bus[2], 0xc0 >> 1, 0,
+		&reg[0], 39, &data[0]);
+
+	return 0;
+}
+
+int saa7164_api_configure_port_mpeg2ts(struct saa7164_dev *dev,
+	struct saa7164_tsport *port,
+	tmComResTSFormatDescrHeader_t *tsfmt)
+{
+	dprintk(DBGLVL_API, "    bFormatIndex = 0x%x\n", tsfmt->bFormatIndex);
+	dprintk(DBGLVL_API, "    bDataOffset  = 0x%x\n", tsfmt->bDataOffset);
+	dprintk(DBGLVL_API, "    bPacketLength= 0x%x\n", tsfmt->bPacketLength);
+	dprintk(DBGLVL_API, "    bStrideLength= 0x%x\n", tsfmt->bStrideLength);
+	dprintk(DBGLVL_API, "    bguid        = (....)\n");
+
+	/* Cache the hardware configuration in the port */
+
+	port->bufcounter = port->hwcfg.BARLocation;
+	port->pitch = port->hwcfg.BARLocation + (2 * sizeof(u32));
+	port->bufsize = port->hwcfg.BARLocation + (3 * sizeof(u32));
+	port->bufoffset = port->hwcfg.BARLocation + (4 * sizeof(u32));
+	port->bufptr32l = port->hwcfg.BARLocation +
+		(4 * sizeof(u32)) +
+		(sizeof(u32) * port->hwcfg.buffercount) + sizeof(u32);
+	port->bufptr32h = port->hwcfg.BARLocation +
+		(4 * sizeof(u32)) +
+		(sizeof(u32) * port->hwcfg.buffercount);
+	port->bufptr64 = port->hwcfg.BARLocation +
+		(4 * sizeof(u32)) +
+		(sizeof(u32) * port->hwcfg.buffercount);
+	dprintk(DBGLVL_API, "   = port->hwcfg.BARLocation = 0x%x\n",
+		port->hwcfg.BARLocation);
+
+	dprintk(DBGLVL_API, "   = VS_FORMAT_MPEGTS (becomes dev->ts[%d])\n",
+		port->nr);
+
+	return 0;
+}
+
+int saa7164_api_dump_subdevs(struct saa7164_dev *dev, u8 *buf, int len)
+{
+	struct saa7164_tsport *port = 0;
+	u32 idx, next_offset;
+	int i;
+	tmComResDescrHeader_t *hdr, *t;
+	tmComResExtDevDescrHeader_t *exthdr;
+	tmComResPathDescrHeader_t *pathhdr;
+	tmComResAntTermDescrHeader_t *anttermhdr;
+	tmComResTunerDescrHeader_t *tunerunithdr;
+	tmComResDMATermDescrHeader_t *vcoutputtermhdr;
+	tmComResTSFormatDescrHeader_t *tsfmt;
+	u32 currpath = 0;
+
+	dprintk(DBGLVL_API,
+		"%s(?,?,%d) sizeof(tmComResDescrHeader_t) = %lu bytes\n",
+		__func__, len, sizeof(tmComResDescrHeader_t));
+
+	for (idx = 0; idx < (len - sizeof(tmComResDescrHeader_t)); ) {
+
+		hdr = (tmComResDescrHeader_t *)(buf + idx);
+
+		if (hdr->type != CS_INTERFACE)
+			return SAA_ERR_NOT_SUPPORTED;
+
+		dprintk(DBGLVL_API, "@ 0x%x = \n", idx);
+		switch (hdr->subtype) {
+		case GENERAL_REQUEST:
+			dprintk(DBGLVL_API, " GENERAL_REQUEST\n");
+			break;
+		case VC_TUNER_PATH:
+			dprintk(DBGLVL_API, " VC_TUNER_PATH\n");
+			pathhdr = (tmComResPathDescrHeader_t *)(buf + idx);
+			dprintk(DBGLVL_API, "  pathid = 0x%x\n",
+				pathhdr->pathid);
+			currpath = pathhdr->pathid;
+			break;
+		case VC_INPUT_TERMINAL:
+			dprintk(DBGLVL_API, " VC_INPUT_TERMINAL\n");
+			anttermhdr =
+				(tmComResAntTermDescrHeader_t *)(buf + idx);
+			dprintk(DBGLVL_API, "  terminalid   = 0x%x\n",
+				anttermhdr->terminalid);
+			dprintk(DBGLVL_API, "  terminaltype = 0x%x\n",
+				anttermhdr->terminaltype);
+			switch (anttermhdr->terminaltype) {
+			case ITT_ANTENNA:
+				dprintk(DBGLVL_API, "   = ITT_ANTENNA\n");
+				break;
+			case LINE_CONNECTOR:
+				dprintk(DBGLVL_API, "   = LINE_CONNECTOR\n");
+				break;
+			case SPDIF_CONNECTOR:
+				dprintk(DBGLVL_API, "   = SPDIF_CONNECTOR\n");
+				break;
+			case COMPOSITE_CONNECTOR:
+				dprintk(DBGLVL_API,
+					"   = COMPOSITE_CONNECTOR\n");
+				break;
+			case SVIDEO_CONNECTOR:
+				dprintk(DBGLVL_API, "   = SVIDEO_CONNECTOR\n");
+				break;
+			case COMPONENT_CONNECTOR:
+				dprintk(DBGLVL_API,
+					"   = COMPONENT_CONNECTOR\n");
+				break;
+			case STANDARD_DMA:
+				dprintk(DBGLVL_API, "   = STANDARD_DMA\n");
+				break;
+			default:
+				dprintk(DBGLVL_API, "   = undefined (0x%x)\n",
+					anttermhdr->terminaltype);
+			}
+			dprintk(DBGLVL_API, "  assocterminal= 0x%x\n",
+				anttermhdr->assocterminal);
+			dprintk(DBGLVL_API, "  iterminal    = 0x%x\n",
+				anttermhdr->iterminal);
+			dprintk(DBGLVL_API, "  controlsize  = 0x%x\n",
+				anttermhdr->controlsize);
+			break;
+		case VC_OUTPUT_TERMINAL:
+			dprintk(DBGLVL_API, " VC_OUTPUT_TERMINAL\n");
+			vcoutputtermhdr =
+				(tmComResDMATermDescrHeader_t *)(buf + idx);
+			dprintk(DBGLVL_API, "  unitid = 0x%x\n",
+				vcoutputtermhdr->unitid);
+			dprintk(DBGLVL_API, "  terminaltype = 0x%x\n",
+				vcoutputtermhdr->terminaltype);
+			switch (vcoutputtermhdr->terminaltype) {
+			case ITT_ANTENNA:
+				dprintk(DBGLVL_API, "   = ITT_ANTENNA\n");
+				break;
+			case LINE_CONNECTOR:
+				dprintk(DBGLVL_API, "   = LINE_CONNECTOR\n");
+				break;
+			case SPDIF_CONNECTOR:
+				dprintk(DBGLVL_API, "   = SPDIF_CONNECTOR\n");
+				break;
+			case COMPOSITE_CONNECTOR:
+				dprintk(DBGLVL_API,
+					"   = COMPOSITE_CONNECTOR\n");
+				break;
+			case SVIDEO_CONNECTOR:
+				dprintk(DBGLVL_API, "   = SVIDEO_CONNECTOR\n");
+				break;
+			case COMPONENT_CONNECTOR:
+				dprintk(DBGLVL_API,
+					"   = COMPONENT_CONNECTOR\n");
+				break;
+			case STANDARD_DMA:
+				dprintk(DBGLVL_API, "   = STANDARD_DMA\n");
+				break;
+			default:
+				dprintk(DBGLVL_API, "   = undefined (0x%x)\n",
+					vcoutputtermhdr->terminaltype);
+			}
+			dprintk(DBGLVL_API, "  assocterminal= 0x%x\n",
+				vcoutputtermhdr->assocterminal);
+			dprintk(DBGLVL_API, "  sourceid     = 0x%x\n",
+				vcoutputtermhdr->sourceid);
+			dprintk(DBGLVL_API, "  iterminal    = 0x%x\n",
+				vcoutputtermhdr->iterminal);
+			dprintk(DBGLVL_API, "  BARLocation  = 0x%x\n",
+				vcoutputtermhdr->BARLocation);
+			dprintk(DBGLVL_API, "  flags        = 0x%x\n",
+				vcoutputtermhdr->flags);
+			dprintk(DBGLVL_API, "  interruptid  = 0x%x\n",
+				vcoutputtermhdr->interruptid);
+			dprintk(DBGLVL_API, "  buffercount  = 0x%x\n",
+				vcoutputtermhdr->buffercount);
+			dprintk(DBGLVL_API, "  metadatasize = 0x%x\n",
+				vcoutputtermhdr->metadatasize);
+			dprintk(DBGLVL_API, "  controlsize  = 0x%x\n",
+				vcoutputtermhdr->controlsize);
+			dprintk(DBGLVL_API, "  numformats   = 0x%x\n",
+				vcoutputtermhdr->numformats);
+
+			t = (tmComResDescrHeader_t *)
+				((tmComResDMATermDescrHeader_t *)(buf + idx));
+			next_offset = idx + (vcoutputtermhdr->len);
+			for (i = 0; i < vcoutputtermhdr->numformats; i++) {
+				t = (tmComResDescrHeader_t *)
+					(buf + next_offset);
+				switch (t->subtype) {
+				case VS_FORMAT_MPEG2TS:
+					tsfmt =
+					(tmComResTSFormatDescrHeader_t *)t;
+					if (currpath == 1)
+						port = &dev->ts1;
+					else
+						port = &dev->ts2;
+					memcpy(&port->hwcfg, vcoutputtermhdr,
+						sizeof(*vcoutputtermhdr));
+					saa7164_api_configure_port_mpeg2ts(dev,
+						port, tsfmt);
+					break;
+				case VS_FORMAT_MPEG2PS:
+					dprintk(DBGLVL_API,
+						"   = VS_FORMAT_MPEG2PS\n");
+					break;
+				case VS_FORMAT_VBI:
+					dprintk(DBGLVL_API,
+						"   = VS_FORMAT_VBI\n");
+					break;
+				case VS_FORMAT_RDS:
+					dprintk(DBGLVL_API,
+						"   = VS_FORMAT_RDS\n");
+					break;
+				case VS_FORMAT_UNCOMPRESSED:
+					dprintk(DBGLVL_API,
+					"   = VS_FORMAT_UNCOMPRESSED\n");
+					break;
+				case VS_FORMAT_TYPE:
+					dprintk(DBGLVL_API,
+						"   = VS_FORMAT_TYPE\n");
+					break;
+				default:
+					dprintk(DBGLVL_API,
+						"   = undefined (0x%x)\n",
+						t->subtype);
+				}
+				next_offset += t->len;
+			}
+
+			break;
+		case TUNER_UNIT:
+			dprintk(DBGLVL_API, " TUNER_UNIT\n");
+			tunerunithdr =
+				(tmComResTunerDescrHeader_t *)(buf + idx);
+			dprintk(DBGLVL_API, "  unitid = 0x%x\n",
+				tunerunithdr->unitid);
+			dprintk(DBGLVL_API, "  sourceid = 0x%x\n",
+				tunerunithdr->sourceid);
+			dprintk(DBGLVL_API, "  iunit = 0x%x\n",
+				tunerunithdr->iunit);
+			dprintk(DBGLVL_API, "  tuningstandards = 0x%x\n",
+				tunerunithdr->tuningstandards);
+			dprintk(DBGLVL_API, "  controlsize = 0x%x\n",
+				tunerunithdr->controlsize);
+			dprintk(DBGLVL_API, "  controls = 0x%x\n",
+				tunerunithdr->controls);
+			break;
+		case VC_SELECTOR_UNIT:
+			dprintk(DBGLVL_API, " VC_SELECTOR_UNIT\n");
+			break;
+		case VC_PROCESSING_UNIT:
+			dprintk(DBGLVL_API, " VC_PROCESSING_UNIT\n");
+			break;
+		case FEATURE_UNIT:
+			dprintk(DBGLVL_API, " FEATURE_UNIT\n");
+			break;
+		case ENCODER_UNIT:
+			dprintk(DBGLVL_API, " ENCODER_UNIT\n");
+			break;
+		case EXTENSION_UNIT:
+			dprintk(DBGLVL_API, " EXTENSION_UNIT\n");
+			exthdr = (tmComResExtDevDescrHeader_t *)(buf + idx);
+			dprintk(DBGLVL_API, "  unitid = 0x%x\n",
+				exthdr->unitid);
+			dprintk(DBGLVL_API, "  deviceid = 0x%x\n",
+				exthdr->deviceid);
+			dprintk(DBGLVL_API, "  devicetype = 0x%x\n",
+				exthdr->devicetype);
+			if (exthdr->devicetype & 0x1)
+				dprintk(DBGLVL_API, "   = Decoder Device\n");
+			if (exthdr->devicetype & 0x2)
+				dprintk(DBGLVL_API, "   = GPIO Source\n");
+			if (exthdr->devicetype & 0x4)
+				dprintk(DBGLVL_API, "   = Video Decoder\n");
+			if (exthdr->devicetype & 0x8)
+				dprintk(DBGLVL_API, "   = Audio Decoder\n");
+			if (exthdr->devicetype & 0x20)
+				dprintk(DBGLVL_API, "   = Crossbar\n");
+			if (exthdr->devicetype & 0x40)
+				dprintk(DBGLVL_API, "   = Tuner\n");
+			if (exthdr->devicetype & 0x80)
+				dprintk(DBGLVL_API, "   = IF PLL\n");
+			if (exthdr->devicetype & 0x100)
+				dprintk(DBGLVL_API, "   = Demodulator\n");
+			if (exthdr->devicetype & 0x200)
+				dprintk(DBGLVL_API, "   = RDS Decoder\n");
+			if (exthdr->devicetype & 0x400)
+				dprintk(DBGLVL_API, "   = Encoder\n");
+			if (exthdr->devicetype & 0x800)
+				dprintk(DBGLVL_API, "   = IR Decoder\n");
+			if (exthdr->devicetype & 0x1000)
+				dprintk(DBGLVL_API, "   = EEPROM\n");
+			if (exthdr->devicetype & 0x2000)
+				dprintk(DBGLVL_API,
+					"   = VBI Decoder\n");
+			if (exthdr->devicetype & 0x10000)
+				dprintk(DBGLVL_API,
+					"   = Streaming Device\n");
+			if (exthdr->devicetype & 0x20000)
+				dprintk(DBGLVL_API,
+					"   = DRM Device\n");
+			if (exthdr->devicetype & 0x40000000)
+				dprintk(DBGLVL_API,
+					"   = Generic Device\n");
+			if (exthdr->devicetype & 0x80000000)
+				dprintk(DBGLVL_API,
+					"   = Config Space Device\n");
+			dprintk(DBGLVL_API, "  numgpiopins = 0x%x\n",
+				exthdr->numgpiopins);
+			dprintk(DBGLVL_API, "  numgpiogroups = 0x%x\n",
+				exthdr->numgpiogroups);
+			dprintk(DBGLVL_API, "  controlsize = 0x%x\n",
+				exthdr->controlsize);
+			break;
+		case PVC_INFRARED_UNIT:
+			dprintk(DBGLVL_API, " PVC_INFRARED_UNIT\n");
+			break;
+		case DRM_UNIT:
+			dprintk(DBGLVL_API, " DRM_UNIT\n");
+			break;
+		default:
+			dprintk(DBGLVL_API, "default %d\n", hdr->subtype);
+		}
+
+		dprintk(DBGLVL_API, " 1.%x\n", hdr->len);
+		dprintk(DBGLVL_API, " 2.%x\n", hdr->type);
+		dprintk(DBGLVL_API, " 3.%x\n", hdr->subtype);
+		dprintk(DBGLVL_API, " 4.%x\n", hdr->unitid);
+
+		idx += hdr->len;
+	}
+
+	return 0;
+}
+
+int saa7164_api_enum_subdevs(struct saa7164_dev *dev)
+{
+	int ret;
+	u32 buflen = 0;
+	u8 *buf;
+
+	dprintk(DBGLVL_API, "%s()\n", __func__);
+
+	/* Get the total descriptor length */
+	ret = saa7164_cmd_send(dev, 0, GET_LEN,
+		GET_DESCRIPTORS_CONTROL, sizeof(buflen), &buflen);
+	if (ret != SAA_OK)
+		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);
+
+	dprintk(DBGLVL_API, "%s() total descriptor size = %d bytes.\n",
+		__func__, buflen);
+
+	/* Allocate enough storage for all of the descs */
+	buf = kzalloc(buflen, GFP_KERNEL);
+	if (buf == NULL)
+		return SAA_ERR_NO_RESOURCES;
+
+	/* Retrieve them */
+	ret = saa7164_cmd_send(dev, 0, GET_CUR,
+		GET_DESCRIPTORS_CONTROL, buflen, buf);
+	if (ret != SAA_OK) {
+		printk(KERN_ERR "%s() error, ret = 0x%x\n", __func__, ret);
+		goto out;
+	}
+
+	if (debug & DBGLVL_API)
+		saa7164_dumphex16(dev, buf, (buflen/16)*16);
+
+	saa7164_api_dump_subdevs(dev, buf, buflen);
+
+out:
+	kfree(buf);
+	return ret;
+}
+
+int saa7164_api_i2c_read(struct saa7164_i2c *bus, u8 addr, u32 reglen, u8 *reg,
+	u32 datalen, u8 *data)
+{
+	struct saa7164_dev *dev = bus->dev;
+	u16 len = 0;
+	int unitid;
+	u32 regval;
+	u8 buf[256];
+	int ret;
+
+	dprintk(DBGLVL_API, "%s()\n", __func__);
+
+	if (reglen > 4)
+		return -EIO;
+
+	if (reglen == 1)
+		regval = *(reg);
+	else
+	if (reglen == 2)
+		regval = ((*(reg) << 8) || *(reg+1));
+	else
+	if (reglen == 3)
+		regval = ((*(reg) << 16) | (*(reg+1) << 8) | *(reg+2));
+	else
+	if (reglen == 4)
+		regval = ((*(reg) << 24) | (*(reg+1) << 16) |
+			(*(reg+2) << 8) | *(reg+3));
+
+	/* Prepare the send buffer */
+	/* Bytes 00-03 source register length
+	 *       04-07 source bytes to read
+	 *       08... register address
+	 */
+	memset(buf, 0, sizeof(buf));
+	memcpy((buf + 2 * sizeof(u32) + 0), reg, reglen);
+	*((u32 *)(buf + 0 * sizeof(u32))) = reglen;
+	*((u32 *)(buf + 1 * sizeof(u32))) = datalen;
+
+	unitid = saa7164_i2caddr_to_unitid(bus, addr);
+	if (unitid < 0) {
+		printk(KERN_ERR
+			"%s() error, cannot translate regaddr 0x%x to unitid\n",
+			__func__, addr);
+		return -EIO;
+	}
+
+	ret = saa7164_cmd_send(bus->dev, unitid, GET_LEN,
+		EXU_REGISTER_ACCESS_CONTROL, sizeof(len), &len);
+	if (ret != SAA_OK) {
+		printk(KERN_ERR "%s() error, ret(1) = 0x%x\n", __func__, ret);
+		return -EIO;
+	}
+
+	dprintk(DBGLVL_API, "%s() len = %d bytes\n", __func__, len);
+
+	if (debug & DBGLVL_I2C)
+		saa7164_dumphex16(dev, buf, 2 * 16);
+
+	ret = saa7164_cmd_send(bus->dev, unitid, GET_CUR,
+		EXU_REGISTER_ACCESS_CONTROL, len, &buf);
+	if (ret != SAA_OK)
+		printk(KERN_ERR "%s() error, ret(2) = 0x%x\n", __func__, ret);
+	else {
+		if (debug & DBGLVL_I2C)
+			saa7164_dumphex16(dev, buf, sizeof(buf));
+		memcpy(data, (buf + 2 * sizeof(u32) + reglen), datalen);
+	}
+
+	return ret == SAA_OK ? 0 : -EIO;
+}
+
+/* For a given 8 bit i2c address device, write the buffer */
+int saa7164_api_i2c_write(struct saa7164_i2c *bus, u8 addr, u32 datalen,
+	u8 *data)
+{
+	struct saa7164_dev *dev = bus->dev;
+	u16 len = 0;
+	int unitid;
+	int reglen;
+	u8 buf[256];
+	int ret;
+
+	dprintk(DBGLVL_API, "%s()\n", __func__);
+
+	if ((datalen == 0) || (datalen > 232))
+		return -EIO;
+
+	memset(buf, 0, sizeof(buf));
+
+	unitid = saa7164_i2caddr_to_unitid(bus, addr);
+	if (unitid < 0) {
+		printk(KERN_ERR
+			"%s() error, cannot translate regaddr 0x%x to unitid\n",
+			__func__, addr);
+		return -EIO;
+	}
+
+	reglen = saa7164_i2caddr_to_reglen(bus, addr);
+	if (unitid < 0) {
+		printk(KERN_ERR
+			"%s() error, cannot translate regaddr to reglen\n",
+			__func__);
+		return -EIO;
+	}
+
+	ret = saa7164_cmd_send(bus->dev, unitid, GET_LEN,
+		EXU_REGISTER_ACCESS_CONTROL, sizeof(len), &len);
+	if (ret != SAA_OK) {
+		printk(KERN_ERR "%s() error, ret(1) = 0x%x\n", __func__, ret);
+		return -EIO;
+	}
+
+	dprintk(DBGLVL_API, "%s() len = %d bytes\n", __func__, len);
+
+	/* Prepare the send buffer */
+	/* Bytes 00-03 dest register length
+	 *       04-07 dest bytes to write
+	 *       08... register address
+	 */
+	*((u32 *)(buf + 0 * sizeof(u32))) = reglen;
+	*((u32 *)(buf + 1 * sizeof(u32))) = datalen - reglen;
+	memcpy((buf + 2 * sizeof(u32)), data, datalen);
+
+	if (debug & DBGLVL_I2C)
+		saa7164_dumphex16(dev, buf, sizeof(buf));
+
+	ret = saa7164_cmd_send(bus->dev, unitid, SET_CUR,
+		EXU_REGISTER_ACCESS_CONTROL, len, &buf);
+	if (ret != SAA_OK)
+		printk(KERN_ERR "%s() error, ret(2) = 0x%x\n", __func__, ret);
+
+	return ret == SAA_OK ? 0 : -EIO;
+}
+
+
+int saa7164_api_modify_gpio(struct saa7164_dev *dev, u8 unitid,
+	u8 pin, u8 state)
+{
+	int ret;
+	tmComResGPIO_t t;
+
+	dprintk(DBGLVL_API, "%s(0x%x, %d, %d)\n",
+		__func__, unitid, pin, state);
+
+	if ((pin > 7) || (state > 2))
+		return SAA_ERR_BAD_PARAMETER;
+
+	t.pin = pin;
+	t.state = state;
+
+	ret = saa7164_cmd_send(dev, unitid, SET_CUR,
+		EXU_GPIO_CONTROL, sizeof(t), &t);
+	if (ret != SAA_OK)
+		printk(KERN_ERR "%s() error, ret = 0x%x\n",
+			__func__, ret);
+
+	return ret;
+}
+
+int saa7164_api_set_gpiobit(struct saa7164_dev *dev, u8 unitid,
+	u8 pin)
+{
+	return saa7164_api_modify_gpio(dev, unitid, pin, 1);
+}
+
+int saa7164_api_clear_gpiobit(struct saa7164_dev *dev, u8 unitid,
+	u8 pin)
+{
+	return saa7164_api_modify_gpio(dev, unitid, pin, 0);
+}
+
+
+