[PATCH] v4l: (946) adds support for cx25840 video decoder

Adds support for cx25840 video decoder.

Driver authors: Hans Verkuil, Chris Kennedy, Tyler Trafford, Ulf Eklund.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NChris Kennedy <c@groovy.org>
Signed-off-by: NTyler Trafford <tatrafford@comcast.net>
Thanks-to: Ulf Eklund <ivtv@eklund.to>.
Signed-off-by: NMauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/media/video/cx25840/cx25840-audio.c

+/* cx25840 audio functions
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include <linux/videodev2.h>
+#include <linux/i2c.h>
+#include <media/audiochip.h>
+#include <media/i2c-compat.h>
+#include <media/v4l2-common.h>
+
+#include "cx25840.h"
+
+inline static int set_audclk_freq(struct i2c_client *client,
+				 enum v4l2_audio_clock_freq freq)
+{
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	/* assert soft reset */
+	cx25840_and_or(client, 0x810, ~0x1, 0x01);
+
+	/* common for all inputs and rates */
+	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
+	cx25840_write(client, 0x127, 0x50);
+
+	switch (state->audio_input) {
+	case AUDIO_TUNER:
+		switch (freq) {
+		case V4L2_AUDCLK_32_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040610);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xee39bb01);
+
+			/* src3/4/6_ctl = 0x0801f77f */
+			cx25840_write4(client, 0x900, 0x7ff70108);
+			cx25840_write4(client, 0x904, 0x7ff70108);
+			cx25840_write4(client, 0x90c, 0x7ff70108);
+			break;
+
+		case V4L2_AUDCLK_441_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040910);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xd66bec00);
+
+			/* src3/4/6_ctl = 0x08016d59 */
+			cx25840_write4(client, 0x900, 0x596d0108);
+			cx25840_write4(client, 0x904, 0x596d0108);
+			cx25840_write4(client, 0x90c, 0x596d0108);
+			break;
+
+		case V4L2_AUDCLK_48_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040a10);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xe5d69800);
+
+			/* src3/4/6_ctl = 0x08014faa */
+			cx25840_write4(client, 0x900, 0xaa4f0108);
+			cx25840_write4(client, 0x904, 0xaa4f0108);
+			cx25840_write4(client, 0x90c, 0xaa4f0108);
+			break;
+		}
+		break;
+
+	case AUDIO_EXTERN_1:
+	case AUDIO_EXTERN_2:
+	case AUDIO_INTERN:
+	case AUDIO_RADIO:
+		switch (freq) {
+		case V4L2_AUDCLK_32_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f04081e);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0x69082a01);
+
+			/* src1_ctl = 0x08010000 */
+			cx25840_write4(client, 0x8f8, 0x00000108);
+
+			/* src3/4/6_ctl = 0x08020000 */
+			cx25840_write4(client, 0x900, 0x00000208);
+			cx25840_write4(client, 0x904, 0x00000208);
+			cx25840_write4(client, 0x90c, 0x00000208);
+
+			/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
+			cx25840_write(client, 0x127, 0x54);
+			break;
+
+		case V4L2_AUDCLK_441_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040918);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xd66bec00);
+
+			/* src1_ctl = 0x08010000 */
+			cx25840_write4(client, 0x8f8, 0xcd600108);
+
+			/* src3/4/6_ctl = 0x08020000 */
+			cx25840_write4(client, 0x900, 0x85730108);
+			cx25840_write4(client, 0x904, 0x85730108);
+			cx25840_write4(client, 0x90c, 0x85730108);
+			break;
+
+		case V4L2_AUDCLK_48_KHZ:
+			/* VID_PLL and AUX_PLL */
+			cx25840_write4(client, 0x108, 0x0f040a18);
+
+			/* AUX_PLL_FRAC */
+			cx25840_write4(client, 0x110, 0xe5d69800);
+
+			/* src1_ctl = 0x08010000 */
+			cx25840_write4(client, 0x8f8, 0x00800108);
+
+			/* src3/4/6_ctl = 0x08020000 */
+			cx25840_write4(client, 0x900, 0x55550108);
+			cx25840_write4(client, 0x904, 0x55550108);
+			cx25840_write4(client, 0x90c, 0x55550108);
+			break;
+		}
+		break;
+	}
+
+	/* deassert soft reset */
+	cx25840_and_or(client, 0x810, ~0x1, 0x00);
+
+	state->audclk_freq = freq;
+
+	return 0;
+}
+
+static int set_input(struct i2c_client *client, int audio_input)
+{
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	cx25840_dbg("set audio input (%d)\n", audio_input);
+
+	/* stop microcontroller */
+	cx25840_and_or(client, 0x803, ~0x10, 0);
+
+	/* Mute everything to prevent the PFFT! */
+	cx25840_write(client, 0x8d3, 0x1f);
+
+	switch (audio_input) {
+	case AUDIO_TUNER:
+		/* Set Path1 to Analog Demod Main Channel */
+		cx25840_write4(client, 0x8d0, 0x7038061f);
+
+		/* When the microcontroller detects the
+		 * audio format, it will unmute the lines */
+		cx25840_and_or(client, 0x803, ~0x10, 0x10);
+		break;
+
+	case AUDIO_EXTERN_1:
+	case AUDIO_EXTERN_2:
+	case AUDIO_INTERN:
+	case AUDIO_RADIO:
+		/* Set Path1 to Serial Audio Input */
+		cx25840_write4(client, 0x8d0, 0x12100101);
+
+		/* The microcontroller should not be started for the
+		 * non-tuner inputs: autodetection is specific for
+		 * TV audio. */
+		break;
+
+	default:
+		cx25840_dbg("Invalid audio input selection %d\n", audio_input);
+		return -EINVAL;
+	}
+
+	state->audio_input = audio_input;
+
+	return set_audclk_freq(client, state->audclk_freq);
+}
+
+inline static int get_volume(struct i2c_client *client)
+{
+	/* Volume runs +18dB to -96dB in 1/2dB steps
+	 * change to fit the msp3400 -114dB to +12dB range */
+
+	/* check PATH1_VOLUME */
+	int vol = 228 - cx25840_read(client, 0x8d4);
+	vol = (vol / 2) + 23;
+	return vol << 9;
+}
+
+inline static void set_volume(struct i2c_client *client, int volume)
+{
+	/* First convert the volume to msp3400 values (0-127) */
+	int vol = volume >> 9;
+	/* now scale it up to cx25840 values
+	 * -114dB to -96dB maps to 0
+	 * this should be 19, but in my testing that was 4dB too loud */
+	if (vol <= 23) {
+		vol = 0;
+	} else {
+		vol -= 23;
+	}
+
+	/* PATH1_VOLUME */
+	cx25840_write(client, 0x8d4, 228 - (vol * 2));
+}
+
+inline static int get_bass(struct i2c_client *client)
+{
+	/* bass is 49 steps +12dB to -12dB */
+
+	/* check PATH1_EQ_BASS_VOL */
+	int bass = cx25840_read(client, 0x8d9) & 0x3f;
+	bass = (((48 - bass) * 0xffff) + 47) / 48;
+	return bass;
+}
+
+inline static void set_bass(struct i2c_client *client, int bass)
+{
+	/* PATH1_EQ_BASS_VOL */
+	cx25840_and_or(client, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
+}
+
+inline static int get_treble(struct i2c_client *client)
+{
+	/* treble is 49 steps +12dB to -12dB */
+
+	/* check PATH1_EQ_TREBLE_VOL */
+	int treble = cx25840_read(client, 0x8db) & 0x3f;
+	treble = (((48 - treble) * 0xffff) + 47) / 48;
+	return treble;
+}
+
+inline static void set_treble(struct i2c_client *client, int treble)
+{
+	/* PATH1_EQ_TREBLE_VOL */
+	cx25840_and_or(client, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
+}
+
+inline static int get_balance(struct i2c_client *client)
+{
+	/* balance is 7 bit, 0 to -96dB */
+
+	/* check PATH1_BAL_LEVEL */
+	int balance = cx25840_read(client, 0x8d5) & 0x7f;
+	/* check PATH1_BAL_LEFT */
+	if ((cx25840_read(client, 0x8d5) & 0x80) == 0)
+		balance = 0x80 - balance;
+	else
+		balance = 0x80 + balance;
+	return balance << 8;
+}
+
+inline static void set_balance(struct i2c_client *client, int balance)
+{
+	int bal = balance >> 8;
+	if (bal > 0x80) {
+		/* PATH1_BAL_LEFT */
+		cx25840_and_or(client, 0x8d5, 0x7f, 0x80);
+		/* PATH1_BAL_LEVEL */
+		cx25840_and_or(client, 0x8d5, ~0x7f, bal & 0x7f);
+	} else {
+		/* PATH1_BAL_LEFT */
+		cx25840_and_or(client, 0x8d5, 0x7f, 0x00);
+		/* PATH1_BAL_LEVEL */
+		cx25840_and_or(client, 0x8d5, ~0x7f, 0x80 - bal);
+	}
+}
+
+inline static int get_mute(struct i2c_client *client)
+{
+	/* check SRC1_MUTE_EN */
+	return cx25840_read(client, 0x8d3) & 0x2 ? 1 : 0;
+}
+
+inline static void set_mute(struct i2c_client *client, int mute)
+{
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	if (state->audio_input == AUDIO_TUNER) {
+		/* Must turn off microcontroller in order to mute sound.
+		 * Not sure if this is the best method, but it does work.
+		 * If the microcontroller is running, then it will undo any
+		 * changes to the mute register. */
+		if (mute) {
+			/* disable microcontroller */
+			cx25840_and_or(client, 0x803, ~0x10, 0x00);
+			cx25840_write(client, 0x8d3, 0x1f);
+		} else {
+			/* enable microcontroller */
+			cx25840_and_or(client, 0x803, ~0x10, 0x10);
+		}
+	} else {
+		/* SRC1_MUTE_EN */
+		cx25840_and_or(client, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
+	}
+}
+
+int cx25840_audio(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+	struct v4l2_control *ctrl = arg;
+
+	switch (cmd) {
+	case AUDC_SET_INPUT:
+		return set_input(client, *(int *)arg);
+	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
+		return set_audclk_freq(client, *(enum v4l2_audio_clock_freq *)arg);
+	case VIDIOC_G_CTRL:
+		switch (ctrl->id) {
+		case V4L2_CID_AUDIO_VOLUME:
+			ctrl->value = get_volume(client);
+			break;
+		case V4L2_CID_AUDIO_BASS:
+			ctrl->value = get_bass(client);
+			break;
+		case V4L2_CID_AUDIO_TREBLE:
+			ctrl->value = get_treble(client);
+			break;
+		case V4L2_CID_AUDIO_BALANCE:
+			ctrl->value = get_balance(client);
+			break;
+		case V4L2_CID_AUDIO_MUTE:
+			ctrl->value = get_mute(client);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case VIDIOC_S_CTRL:
+		switch (ctrl->id) {
+		case V4L2_CID_AUDIO_VOLUME:
+			set_volume(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_BASS:
+			set_bass(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_TREBLE:
+			set_treble(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_BALANCE:
+			set_balance(client, ctrl->value);
+			break;
+		case V4L2_CID_AUDIO_MUTE:
+			set_mute(client, ctrl->value);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}

drivers/media/video/cx25840/cx25840-firmware.c

+/* cx25840 firmware functions
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <linux/firmware.h>
+#include <media/v4l2-common.h>
+
+#include "cx25840.h"
+
+#define FWFILE "HcwMakoA.ROM"
+#define FWSEND 1024
+
+#define FWDEV(x) &((x)->adapter->dev)
+
+static int fastfw = 1;
+static char *firmware = FWFILE;
+
+module_param(fastfw, bool, 0444);
+module_param(firmware, charp, 0444);
+
+MODULE_PARM_DESC(fastfw, "Load firmware fast [0=100MHz 1=333MHz (default)]");
+MODULE_PARM_DESC(firmware, "Firmware image [default: " FWFILE "]");
+
+static inline void set_i2c_delay(struct i2c_client *client, int delay)
+{
+	struct i2c_algo_bit_data *algod = client->adapter->algo_data;
+
+	/* We aren't guaranteed to be using algo_bit,
+	 * so avoid the null pointer dereference
+	 * and disable the 'fast firmware load' */
+	if (algod) {
+		algod->udelay = delay;
+	} else {
+		fastfw = 0;
+	}
+}
+
+static inline void start_fw_load(struct i2c_client *client)
+{
+	/* DL_ADDR_LB=0 DL_ADDR_HB=0 */
+	cx25840_write(client, 0x800, 0x00);
+	cx25840_write(client, 0x801, 0x00);
+	// DL_MAP=3 DL_AUTO_INC=0 DL_ENABLE=1
+	cx25840_write(client, 0x803, 0x0b);
+	/* AUTO_INC_DIS=1 */
+	cx25840_write(client, 0x000, 0x20);
+
+	if (fastfw)
+		set_i2c_delay(client, 3);
+}
+
+static inline void end_fw_load(struct i2c_client *client)
+{
+	if (fastfw)
+		set_i2c_delay(client, 10);
+
+	/* AUTO_INC_DIS=0 */
+	cx25840_write(client, 0x000, 0x00);
+	/* DL_ENABLE=0 */
+	cx25840_write(client, 0x803, 0x03);
+}
+
+static inline int check_fw_load(struct i2c_client *client, int size)
+{
+	/* DL_ADDR_HB DL_ADDR_LB */
+	int s = cx25840_read(client, 0x801) << 8;
+	s |= cx25840_read(client, 0x800);
+
+	if (size != s) {
+		cx25840_err("firmware %s load failed\n", firmware);
+		return -EINVAL;
+	}
+
+	cx25840_info("loaded %s firmware (%d bytes)\n", firmware, size);
+	return 0;
+}
+
+static inline int fw_write(struct i2c_client *client, u8 * data, int size)
+{
+	if (i2c_master_send(client, data, size) < size) {
+
+		if (fastfw) {
+			cx25840_err("333MHz i2c firmware load failed\n");
+			fastfw = 0;
+			set_i2c_delay(client, 10);
+
+			if (i2c_master_send(client, data, size) < size) {
+				cx25840_err
+				    ("100MHz i2c firmware load failed\n");
+				return -ENOSYS;
+			}
+
+		} else {
+			cx25840_err("firmware load i2c failure\n");
+			return -ENOSYS;
+		}
+
+	}
+
+	return 0;
+}
+
+int cx25840_loadfw(struct i2c_client *client)
+{
+	const struct firmware *fw = NULL;
+	u8 buffer[4], *ptr;
+	int size, send, retval;
+
+	if (request_firmware(&fw, firmware, FWDEV(client)) != 0) {
+		cx25840_err("unable to open firmware %s\n", firmware);
+		return -EINVAL;
+	}
+
+	start_fw_load(client);
+
+	buffer[0] = 0x08;
+	buffer[1] = 0x02;
+	buffer[2] = fw->data[0];
+	buffer[3] = fw->data[1];
+	retval = fw_write(client, buffer, 4);
+
+	if (retval < 0) {
+		release_firmware(fw);
+		return retval;
+	}
+
+	size = fw->size - 2;
+	ptr = fw->data;
+	while (size > 0) {
+		ptr[0] = 0x08;
+		ptr[1] = 0x02;
+		send = size > (FWSEND - 2) ? FWSEND : size + 2;
+		retval = fw_write(client, ptr, send);
+
+		if (retval < 0) {
+			release_firmware(fw);
+			return retval;
+		}
+
+		size -= FWSEND - 2;
+		ptr += FWSEND - 2;
+	}
+
+	end_fw_load(client);
+
+	size = fw->size;
+	release_firmware(fw);
+
+	return check_fw_load(client, size);
+}

drivers/media/video/cx25840/cx25840-vbi.c

+/* cx25840 VBI functions
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include <linux/videodev2.h>
+#include <linux/i2c.h>
+#include <media/v4l2-common.h>
+
+#include "cx25840.h"
+
+static inline int odd_parity(u8 c)
+{
+	c ^= (c >> 4);
+	c ^= (c >> 2);
+	c ^= (c >> 1);
+
+	return c & 1;
+}
+
+static inline int decode_vps(u8 * dst, u8 * p)
+{
+	static const u8 biphase_tbl[] = {
+		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
+		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
+		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
+		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
+		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
+		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
+		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
+		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
+		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
+		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
+		0xc3, 0x4b, 0x43, 0xc3, 0x87, 0x0f, 0x07, 0x87,
+		0x83, 0x0b, 0x03, 0x83, 0xc3, 0x4b, 0x43, 0xc3,
+		0xc1, 0x49, 0x41, 0xc1, 0x85, 0x0d, 0x05, 0x85,
+		0x81, 0x09, 0x01, 0x81, 0xc1, 0x49, 0x41, 0xc1,
+		0xe1, 0x69, 0x61, 0xe1, 0xa5, 0x2d, 0x25, 0xa5,
+		0xa1, 0x29, 0x21, 0xa1, 0xe1, 0x69, 0x61, 0xe1,
+		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
+		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
+		0xc2, 0x4a, 0x42, 0xc2, 0x86, 0x0e, 0x06, 0x86,
+		0x82, 0x0a, 0x02, 0x82, 0xc2, 0x4a, 0x42, 0xc2,
+		0xc0, 0x48, 0x40, 0xc0, 0x84, 0x0c, 0x04, 0x84,
+		0x80, 0x08, 0x00, 0x80, 0xc0, 0x48, 0x40, 0xc0,
+		0xe0, 0x68, 0x60, 0xe0, 0xa4, 0x2c, 0x24, 0xa4,
+		0xa0, 0x28, 0x20, 0xa0, 0xe0, 0x68, 0x60, 0xe0,
+		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
+		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
+		0xd2, 0x5a, 0x52, 0xd2, 0x96, 0x1e, 0x16, 0x96,
+		0x92, 0x1a, 0x12, 0x92, 0xd2, 0x5a, 0x52, 0xd2,
+		0xd0, 0x58, 0x50, 0xd0, 0x94, 0x1c, 0x14, 0x94,
+		0x90, 0x18, 0x10, 0x90, 0xd0, 0x58, 0x50, 0xd0,
+		0xf0, 0x78, 0x70, 0xf0, 0xb4, 0x3c, 0x34, 0xb4,
+		0xb0, 0x38, 0x30, 0xb0, 0xf0, 0x78, 0x70, 0xf0,
+	};
+
+	u8 c, err = 0;
+	int i;
+
+	for (i = 0; i < 2 * 13; i += 2) {
+		err |= biphase_tbl[p[i]] | biphase_tbl[p[i + 1]];
+		c = (biphase_tbl[p[i + 1]] & 0xf) |
+		    ((biphase_tbl[p[i]] & 0xf) << 4);
+		dst[i / 2] = c;
+	}
+
+	return err & 0xf0;
+}
+
+void cx25840_vbi_setup(struct i2c_client *client)
+{
+	v4l2_std_id std = cx25840_get_v4lstd(client);
+
+	if (std & ~V4L2_STD_NTSC) {
+		/* datasheet startup, step 8d */
+		cx25840_write(client, 0x49f, 0x11);
+
+		cx25840_write(client, 0x470, 0x84);
+		cx25840_write(client, 0x471, 0x00);
+		cx25840_write(client, 0x472, 0x2d);
+		cx25840_write(client, 0x473, 0x5d);
+
+		cx25840_write(client, 0x474, 0x24);
+		cx25840_write(client, 0x475, 0x40);
+		cx25840_write(client, 0x476, 0x24);
+		cx25840_write(client, 0x477, 0x28);
+
+		cx25840_write(client, 0x478, 0x1f);
+		cx25840_write(client, 0x479, 0x02);
+
+		if (std & V4L2_STD_SECAM) {
+			cx25840_write(client, 0x47a, 0x80);
+			cx25840_write(client, 0x47b, 0x00);
+			cx25840_write(client, 0x47c, 0x5f);
+			cx25840_write(client, 0x47d, 0x42);
+		} else {
+			cx25840_write(client, 0x47a, 0x90);
+			cx25840_write(client, 0x47b, 0x20);
+			cx25840_write(client, 0x47c, 0x63);
+			cx25840_write(client, 0x47d, 0x82);
+		}
+
+		cx25840_write(client, 0x47e, 0x0a);
+		cx25840_write(client, 0x47f, 0x01);
+	} else {
+		/* datasheet startup, step 8d */
+		cx25840_write(client, 0x49f, 0x14);
+
+		cx25840_write(client, 0x470, 0x7a);
+		cx25840_write(client, 0x471, 0x00);
+		cx25840_write(client, 0x472, 0x2d);
+		cx25840_write(client, 0x473, 0x5b);
+
+		cx25840_write(client, 0x474, 0x1a);
+		cx25840_write(client, 0x475, 0x70);
+		cx25840_write(client, 0x476, 0x1e);
+		cx25840_write(client, 0x477, 0x1e);
+
+		cx25840_write(client, 0x478, 0x1f);
+		cx25840_write(client, 0x479, 0x02);
+		cx25840_write(client, 0x47a, 0x50);
+		cx25840_write(client, 0x47b, 0x66);
+
+		cx25840_write(client, 0x47c, 0x1f);
+		cx25840_write(client, 0x47d, 0x7c);
+		cx25840_write(client, 0x47e, 0x08);
+		cx25840_write(client, 0x47f, 0x00);
+	}
+}
+
+int cx25840_vbi(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+	struct v4l2_format *fmt;
+	struct v4l2_sliced_vbi_format *svbi;
+
+	switch (cmd) {
+	case VIDIOC_G_FMT:
+	{
+		static u16 lcr2vbi[] = {
+			0, V4L2_SLICED_TELETEXT_B, 0,	/* 1 */
+			0, V4L2_SLICED_WSS_625, 0,	/* 4 */
+			V4L2_SLICED_CAPTION_525,	/* 6 */
+			0, 0, V4L2_SLICED_VPS, 0, 0,	/* 9 */
+			0, 0, 0, 0
+		};
+		int i;
+
+		fmt = arg;
+		if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
+			return -EINVAL;
+		svbi = &fmt->fmt.sliced;
+		memset(svbi, 0, sizeof(*svbi));
+		/* we're done if raw VBI is active */
+		if ((cx25840_read(client, 0x404) & 0x10) == 0)
+			break;
+
+		for (i = 7; i <= 23; i++) {
+			u8 v = cx25840_read(client, 0x424 + i - 7);
+
+			svbi->service_lines[0][i] = lcr2vbi[v >> 4];
+			svbi->service_lines[1][i] = lcr2vbi[v & 0xf];
+			svbi->service_set |=
+				 svbi->service_lines[0][i] | svbi->service_lines[1][i];
+		}
+		break;
+	}
+
+	case VIDIOC_S_FMT:
+	{
+		int is_pal = !(cx25840_get_v4lstd(client) & V4L2_STD_NTSC);
+		int vbi_offset = is_pal ? 1 : 0;
+		int i, x;
+		u8 lcr[24];
+
+		fmt = arg;
+		if (fmt->type != V4L2_BUF_TYPE_SLICED_VBI_CAPTURE)
+			return -EINVAL;
+		svbi = &fmt->fmt.sliced;
+		if (svbi->service_set == 0) {
+			/* raw VBI */
+			memset(svbi, 0, sizeof(*svbi));
+
+			/* Setup VBI */
+			cx25840_vbi_setup(client);
+
+			/* VBI Offset */
+			cx25840_write(client, 0x47f, vbi_offset);
+			cx25840_write(client, 0x404, 0x2e);
+			break;
+		}
+
+		for (x = 0; x <= 23; x++)
+			lcr[x] = 0x00;
+
+		/* Setup VBI */
+		cx25840_vbi_setup(client);
+
+		/* Sliced VBI */
+		cx25840_write(client, 0x404, 0x36);	/* Ancillery data */
+		cx25840_write(client, 0x406, 0x13);
+		cx25840_write(client, 0x47f, vbi_offset);
+
+		if (is_pal) {
+			for (i = 0; i <= 6; i++)
+				svbi->service_lines[0][i] =
+					svbi->service_lines[1][i] = 0;
+		} else {
+			for (i = 0; i <= 9; i++)
+				svbi->service_lines[0][i] =
+					svbi->service_lines[1][i] = 0;
+
+			for (i = 22; i <= 23; i++)
+				svbi->service_lines[0][i] =
+					svbi->service_lines[1][i] = 0;
+		}
+
+		for (i = 7; i <= 23; i++) {
+			for (x = 0; x <= 1; x++) {
+				switch (svbi->service_lines[1-x][i]) {
+				case V4L2_SLICED_TELETEXT_B:
+					lcr[i] |= 1 << (4 * x);
+					break;
+				case V4L2_SLICED_WSS_625:
+					lcr[i] |= 4 << (4 * x);
+					break;
+				case V4L2_SLICED_CAPTION_525:
+					lcr[i] |= 6 << (4 * x);
+					break;
+				case V4L2_SLICED_VPS:
+					lcr[i] |= 9 << (4 * x);
+					break;
+				}
+			}
+		}
+
+		for (x = 1, i = 0x424; i <= 0x434; i++, x++) {
+			cx25840_write(client, i, lcr[6 + x]);
+		}
+
+		cx25840_write(client, 0x43c, 0x16);
+
+		if (is_pal) {
+			cx25840_write(client, 0x474, 0x2a);
+		} else {
+			cx25840_write(client, 0x474, 0x1a + 6);
+		}
+		break;
+	}
+
+	case VIDIOC_INT_DECODE_VBI_LINE:
+	{
+		struct v4l2_decode_vbi_line *vbi = arg;
+		u8 *p = vbi->p;
+		int id1, id2, l, err = 0;
+
+		if (p[0] || p[1] != 0xff || p[2] != 0xff ||
+		    (p[3] != 0x55 && p[3] != 0x91)) {
+			vbi->line = vbi->type = 0;
+			break;
+		}
+
+		p += 4;
+		id1 = p[-1];
+		id2 = p[0] & 0xf;
+		l = p[2] & 0x3f;
+		l += 5;
+		p += 4;
+
+		switch (id2) {
+		case 1:
+			id2 = V4L2_SLICED_TELETEXT_B;
+			break;
+		case 4:
+			id2 = V4L2_SLICED_WSS_625;
+			break;
+		case 6:
+			id2 = V4L2_SLICED_CAPTION_525;
+			err = !odd_parity(p[0]) || !odd_parity(p[1]);
+			break;
+		case 9:
+			id2 = V4L2_SLICED_VPS;
+			if (decode_vps(p, p) != 0) {
+				err = 1;
+			}
+			break;
+		default:
+			id2 = 0;
+			err = 1;
+			break;
+		}
+
+		vbi->type = err ? 0 : id2;
+		vbi->line = err ? 0 : l;
+		vbi->is_second_field = err ? 0 : (id1 == 0x55);
+		vbi->p = p;
+		break;
+	}
+	}
+
+	return 0;
+}

drivers/media/video/cx25840/cx25840.h

+/* cx25840 API header
+ *
+ * Copyright (C) 2003-2004 Chris Kennedy
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef _CX25840_H_
+#define _CX25840_H_
+
+
+#include <linux/videodev2.h>
+#include <linux/i2c.h>
+
+extern int cx25840_debug;
+
+#define cx25840_dbg(fmt, arg...) do { if (cx25840_debug) \
+	printk(KERN_INFO "%s debug %d-%04x: " fmt, client->driver->name, \
+	       i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
+
+#define cx25840_err(fmt, arg...) do { \
+	printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->name, \
+	       i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
+
+#define cx25840_info(fmt, arg...) do { \
+	printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->name, \
+	       i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)
+
+#define CX25840_CID_CARDTYPE (V4L2_CID_PRIVATE_BASE+0)
+
+enum cx25840_cardtype {
+	CARDTYPE_PVR150,
+	CARDTYPE_PG600
+};
+
+enum cx25840_input {
+	CX25840_TUNER,
+	CX25840_COMPOSITE0,
+	CX25840_COMPOSITE1,
+	CX25840_SVIDEO0,
+	CX25840_SVIDEO1
+};
+
+struct cx25840_state {
+	enum cx25840_cardtype cardtype;
+	enum cx25840_input input;
+	int audio_input;
+	enum v4l2_audio_clock_freq audclk_freq;
+};
+
+/* ----------------------------------------------------------------------- */
+/* cx25850-core.c 							   */
+int cx25840_write(struct i2c_client *client, u16 addr, u8 value);
+int cx25840_write4(struct i2c_client *client, u16 addr, u32 value);
+u8 cx25840_read(struct i2c_client *client, u16 addr);
+u32 cx25840_read4(struct i2c_client *client, u16 addr);
+int cx25840_and_or(struct i2c_client *client, u16 addr, u8 mask, u8 value);
+v4l2_std_id cx25840_get_v4lstd(struct i2c_client *client);
+
+/* ----------------------------------------------------------------------- */
+/* cx25850-firmware.c                                                      */
+int cx25840_loadfw(struct i2c_client *client);
+
+/* ----------------------------------------------------------------------- */
+/* cx25850-audio.c                                                         */
+int cx25840_audio(struct i2c_client *client, unsigned int cmd, void *arg);
+
+/* ----------------------------------------------------------------------- */
+/* cx25850-vbi.c                                                           */
+void cx25840_vbi_setup(struct i2c_client *client);
+int cx25840_vbi(struct i2c_client *client, unsigned int cmd, void *arg);
+
+#endif