V4L/DVB (12552): FM TX: si4713: Add files to handle si4713 i2c device

This patch adds files to control si4713 devices.
Internal functions to control device properties
and initialization procedures are into these files.
Also, a v4l2 subdev interface is also exported.
This way other drivers can use this as v4l2 i2c subdevice.

Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2067 insertions, 0 deletions

diff --git a/drivers/media/radio/si4713-i2c.c b/drivers/media/radio/si4713-i2c.c
new file mode 100644
index 00000000000..8cbbe48b01b
--- /dev/null
+++ b/drivers/media/radio/si4713-i2c.c
@@ -0,0 +1,2067 @@
+/*
+ * drivers/media/radio/si4713-i2c.c
+ *
+ * Silicon Labs Si4713 FM Radio Transmitter I2C commands.
+ *
+ * Copyright (c) 2009 Nokia Corporation
+ * Contact: Eduardo Valentin <eduardo.valentin@nokia.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-common.h>
+
+#include "si4713-i2c.h"
+
+/* module parameters */
+static int debug;
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug level (0 - 2)");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>");
+MODULE_DESCRIPTION("I2C driver for Si4713 FM Radio Transmitter");
+MODULE_VERSION("0.0.1");
+
+#define DEFAULT_RDS_PI			0x00
+#define DEFAULT_RDS_PTY			0x00
+#define DEFAULT_RDS_PS_NAME		""
+#define DEFAULT_RDS_RADIO_TEXT		DEFAULT_RDS_PS_NAME
+#define DEFAULT_RDS_DEVIATION		0x00C8
+#define DEFAULT_RDS_PS_REPEAT_COUNT	0x0003
+#define DEFAULT_LIMITER_RTIME		0x1392
+#define DEFAULT_LIMITER_DEV		0x102CA
+#define DEFAULT_PILOT_FREQUENCY 	0x4A38
+#define DEFAULT_PILOT_DEVIATION		0x1A5E
+#define DEFAULT_ACOMP_ATIME		0x0000
+#define DEFAULT_ACOMP_RTIME		0xF4240L
+#define DEFAULT_ACOMP_GAIN		0x0F
+#define DEFAULT_ACOMP_THRESHOLD 	(-0x28)
+#define DEFAULT_MUTE			0x01
+#define DEFAULT_POWER_LEVEL		88
+#define DEFAULT_FREQUENCY		8800
+#define DEFAULT_PREEMPHASIS		FMPE_EU
+#define DEFAULT_TUNE_RNL		0xFF
+
+#define to_si4713_device(sd)	container_of(sd, struct si4713_device, sd)
+
+/* frequency domain transformation (using times 10 to avoid floats) */
+#define FREQDEV_UNIT	100000
+#define FREQV4L2_MULTI	625
+#define si4713_to_v4l2(f)	((f * FREQDEV_UNIT) / FREQV4L2_MULTI)
+#define v4l2_to_si4713(f)	((f * FREQV4L2_MULTI) / FREQDEV_UNIT)
+#define FREQ_RANGE_LOW			7600
+#define FREQ_RANGE_HIGH			10800
+
+#define MAX_ARGS 7
+
+#define RDS_BLOCK			8
+#define RDS_BLOCK_CLEAR			0x03
+#define RDS_BLOCK_LOAD			0x04
+#define RDS_RADIOTEXT_2A		0x20
+#define RDS_RADIOTEXT_BLK_SIZE		4
+#define RDS_RADIOTEXT_INDEX_MAX		0x0F
+#define RDS_CARRIAGE_RETURN		0x0D
+
+#define rds_ps_nblocks(len)	((len / RDS_BLOCK) + (len % RDS_BLOCK ? 1 : 0))
+
+#define get_status_bit(p, b, m)	(((p) & (m)) >> (b))
+#define set_bits(p, v, b, m)	(((p) & ~(m)) | ((v) << (b)))
+
+#define ATTACK_TIME_UNIT	500
+
+#define POWER_OFF			0x00
+#define POWER_ON			0x01
+
+#define msb(x)                  ((u8)((u16) x >> 8))
+#define lsb(x)                  ((u8)((u16) x &  0x00FF))
+#define compose_u16(msb, lsb)	(((u16)msb << 8) | lsb)
+#define check_command_failed(status)	(!(status & SI4713_CTS) || \
+					(status & SI4713_ERR))
+/* mute definition */
+#define set_mute(p)	((p & 1) | ((p & 1) << 1));
+#define get_mute(p)	(p & 0x01)
+
+#ifdef DEBUG
+#define DBG_BUFFER(device, message, buffer, size)			\
+	{								\
+		int i;							\
+		char str[(size)*5];					\
+		for (i = 0; i < size; i++)				\
+			sprintf(str + i * 5, " 0x%02x", buffer[i]);	\
+		v4l2_dbg(2, debug, device, "%s:%s\n", message, str);	\
+	}
+#else
+#define DBG_BUFFER(device, message, buffer, size)
+#endif
+
+/*
+ * Values for limiter release time (sorted by second column)
+ *	device	release
+ *	value	time (us)
+ */
+static long limiter_times[] = {
+	2000,	250,
+	1000,	500,
+	510,	1000,
+	255,	2000,
+	170,	3000,
+	127,	4020,
+	102,	5010,
+	85,	6020,
+	73,	7010,
+	64,	7990,
+	57,	8970,
+	51,	10030,
+	25,	20470,
+	17,	30110,
+	13,	39380,
+	10,	51190,
+	8,	63690,
+	7,	73140,
+	6,	85330,
+	5,	102390,
+};
+
+/*
+ * Values for audio compression release time (sorted by second column)
+ *	device	release
+ *	value	time (us)
+ */
+static unsigned long acomp_rtimes[] = {
+	0,	100000,
+	1,	200000,
+	2,	350000,
+	3,	525000,
+	4,	1000000,
+};
+
+/*
+ * Values for preemphasis (sorted by second column)
+ *	device	preemphasis
+ *	value	value (v4l2)
+ */
+static unsigned long preemphasis_values[] = {
+	FMPE_DISABLED,	V4L2_PREEMPHASIS_DISABLED,
+	FMPE_EU,	V4L2_PREEMPHASIS_50_uS,
+	FMPE_USA,	V4L2_PREEMPHASIS_75_uS,
+};
+
+static int usecs_to_dev(unsigned long usecs, unsigned long const array[],
+			int size)
+{
+	int i;
+	int rval = -EINVAL;
+
+	for (i = 0; i < size / 2; i++)
+		if (array[(i * 2) + 1] >= usecs) {
+			rval = array[i * 2];
+			break;
+		}
+
+	return rval;
+}
+
+static unsigned long dev_to_usecs(int value, unsigned long const array[],
+			int size)
+{
+	int i;
+	int rval = -EINVAL;
+
+	for (i = 0; i < size / 2; i++)
+		if (array[i * 2] == value) {
+			rval = array[(i * 2) + 1];
+			break;
+		}
+
+	return rval;
+}
+
+/* si4713_handler: IRQ handler, just complete work */
+static irqreturn_t si4713_handler(int irq, void *dev)
+{
+	struct si4713_device *sdev = dev;
+
+	v4l2_dbg(2, debug, &sdev->sd,
+			"%s: sending signal to completion work.\n", __func__);
+	complete(&sdev->work);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * si4713_send_command - sends a command to si4713 and waits its response
+ * @sdev: si4713_device structure for the device we are communicating
+ * @command: command id
+ * @args: command arguments we are sending (up to 7)
+ * @argn: actual size of @args
+ * @response: buffer to place the expected response from the device (up to 15)
+ * @respn: actual size of @response
+ * @usecs: amount of time to wait before reading the response (in usecs)
+ */
+static int si4713_send_command(struct si4713_device *sdev, const u8 command,
+				const u8 args[], const int argn,
+				u8 response[], const int respn, const int usecs)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
+	u8 data1[MAX_ARGS + 1];
+	int err;
+
+	if (!client->adapter)
+		return -ENODEV;
+
+	/* First send the command and its arguments */
+	data1[0] = command;
+	memcpy(data1 + 1, args, argn);
+	DBG_BUFFER(&sdev->sd, "Parameters", data1, argn + 1);
+
+	err = i2c_master_send(client, data1, argn + 1);
+	if (err != argn + 1) {
+		v4l2_err(&sdev->sd, "Error while sending command 0x%02x\n",
+			command);
+		return (err > 0) ? -EIO : err;
+	}
+
+	/* Wait response from interrupt */
+	if (!wait_for_completion_timeout(&sdev->work,
+				usecs_to_jiffies(usecs) + 1))
+		v4l2_warn(&sdev->sd,
+				"(%s) Device took too much time to answer.\n",
+				__func__);
+
+	/* Then get the response */
+	err = i2c_master_recv(client, response, respn);
+	if (err != respn) {
+		v4l2_err(&sdev->sd,
+			"Error while reading response for command 0x%02x\n",
+			command);
+		return (err > 0) ? -EIO : err;
+	}
+
+	DBG_BUFFER(&sdev->sd, "Response", response, respn);
+	if (check_command_failed(response[0]))
+		return -EBUSY;
+
+	return 0;
+}
+
+/*
+ * si4713_read_property - reads a si4713 property
+ * @sdev: si4713_device structure for the device we are communicating
+ * @prop: property identification number
+ * @pv: property value to be returned on success
+ */
+static int si4713_read_property(struct si4713_device *sdev, u16 prop, u32 *pv)
+{
+	int err;
+	u8 val[SI4713_GET_PROP_NRESP];
+	/*
+	 * 	.First byte = 0
+	 * 	.Second byte = property's MSB
+	 * 	.Third byte = property's LSB
+	 */
+	const u8 args[SI4713_GET_PROP_NARGS] = {
+		0x00,
+		msb(prop),
+		lsb(prop),
+	};
+
+	err = si4713_send_command(sdev, SI4713_CMD_GET_PROPERTY,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (err < 0)
+		return err;
+
+	*pv = compose_u16(val[2], val[3]);
+
+	v4l2_dbg(1, debug, &sdev->sd,
+			"%s: property=0x%02x value=0x%02x status=0x%02x\n",
+			__func__, prop, *pv, val[0]);
+
+	return err;
+}
+
+/*
+ * si4713_write_property - modifies a si4713 property
+ * @sdev: si4713_device structure for the device we are communicating
+ * @prop: property identification number
+ * @val: new value for that property
+ */
+static int si4713_write_property(struct si4713_device *sdev, u16 prop, u16 val)
+{
+	int rval;
+	u8 resp[SI4713_SET_PROP_NRESP];
+	/*
+	 * 	.First byte = 0
+	 * 	.Second byte = property's MSB
+	 * 	.Third byte = property's LSB
+	 * 	.Fourth byte = value's MSB
+	 * 	.Fifth byte = value's LSB
+	 */
+	const u8 args[SI4713_SET_PROP_NARGS] = {
+		0x00,
+		msb(prop),
+		lsb(prop),
+		msb(val),
+		lsb(val),
+	};
+
+	rval = si4713_send_command(sdev, SI4713_CMD_SET_PROPERTY,
+					args, ARRAY_SIZE(args),
+					resp, ARRAY_SIZE(resp),
+					DEFAULT_TIMEOUT);
+
+	if (rval < 0)
+		return rval;
+
+	v4l2_dbg(1, debug, &sdev->sd,
+			"%s: property=0x%02x value=0x%02x status=0x%02x\n",
+			__func__, prop, val, resp[0]);
+
+	/*
+	 * As there is no command response for SET_PROPERTY,
+	 * wait Tcomp time to finish before proceed, in order
+	 * to have property properly set.
+	 */
+	msleep(TIMEOUT_SET_PROPERTY);
+
+	return rval;
+}
+
+/*
+ * si4713_powerup - Powers the device up
+ * @sdev: si4713_device structure for the device we are communicating
+ */
+static int si4713_powerup(struct si4713_device *sdev)
+{
+	int err;
+	u8 resp[SI4713_PWUP_NRESP];
+	/*
+	 * 	.First byte = Enabled interrupts and boot function
+	 * 	.Second byte = Input operation mode
+	 */
+	const u8 args[SI4713_PWUP_NARGS] = {
+		SI4713_PWUP_CTSIEN | SI4713_PWUP_GPO2OEN | SI4713_PWUP_FUNC_TX,
+		SI4713_PWUP_OPMOD_ANALOG,
+	};
+
+	if (sdev->power_state)
+		return 0;
+
+	sdev->platform_data->set_power(1);
+	err = si4713_send_command(sdev, SI4713_CMD_POWER_UP,
+					args, ARRAY_SIZE(args),
+					resp, ARRAY_SIZE(resp),
+					TIMEOUT_POWER_UP);
+
+	if (!err) {
+		v4l2_dbg(1, debug, &sdev->sd, "Powerup response: 0x%02x\n",
+				resp[0]);
+		v4l2_dbg(1, debug, &sdev->sd, "Device in power up mode\n");
+		sdev->power_state = POWER_ON;
+
+		err = si4713_write_property(sdev, SI4713_GPO_IEN,
+						SI4713_STC_INT | SI4713_CTS);
+	} else {
+		sdev->platform_data->set_power(0);
+	}
+
+	return err;
+}
+
+/*
+ * si4713_powerdown - Powers the device down
+ * @sdev: si4713_device structure for the device we are communicating
+ */
+static int si4713_powerdown(struct si4713_device *sdev)
+{
+	int err;
+	u8 resp[SI4713_PWDN_NRESP];
+
+	if (!sdev->power_state)
+		return 0;
+
+	err = si4713_send_command(sdev, SI4713_CMD_POWER_DOWN,
+					NULL, 0,
+					resp, ARRAY_SIZE(resp),
+					DEFAULT_TIMEOUT);
+
+	if (!err) {
+		v4l2_dbg(1, debug, &sdev->sd, "Power down response: 0x%02x\n",
+				resp[0]);
+		v4l2_dbg(1, debug, &sdev->sd, "Device in reset mode\n");
+		sdev->platform_data->set_power(0);
+		sdev->power_state = POWER_OFF;
+	}
+
+	return err;
+}
+
+/*
+ * si4713_checkrev - Checks if we are treating a device with the correct rev.
+ * @sdev: si4713_device structure for the device we are communicating
+ */
+static int si4713_checkrev(struct si4713_device *sdev)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&sdev->sd);
+	int rval;
+	u8 resp[SI4713_GETREV_NRESP];
+
+	mutex_lock(&sdev->mutex);
+
+	rval = si4713_send_command(sdev, SI4713_CMD_GET_REV,
+					NULL, 0,
+					resp, ARRAY_SIZE(resp),
+					DEFAULT_TIMEOUT);
+
+	if (rval < 0)
+		goto unlock;
+
+	if (resp[1] == SI4713_PRODUCT_NUMBER) {
+		v4l2_info(&sdev->sd, "chip found @ 0x%02x (%s)\n",
+				client->addr << 1, client->adapter->name);
+	} else {
+		v4l2_err(&sdev->sd, "Invalid product number\n");
+		rval = -EINVAL;
+	}
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+/*
+ * si4713_wait_stc - Waits STC interrupt and clears status bits. Usefull
+ *		     for TX_TUNE_POWER, TX_TUNE_FREQ and TX_TUNE_MEAS
+ * @sdev: si4713_device structure for the device we are communicating
+ * @usecs: timeout to wait for STC interrupt signal
+ */
+static int si4713_wait_stc(struct si4713_device *sdev, const int usecs)
+{
+	int err;
+	u8 resp[SI4713_GET_STATUS_NRESP];
+
+	/* Wait response from STC interrupt */
+	if (!wait_for_completion_timeout(&sdev->work,
+			usecs_to_jiffies(usecs) + 1))
+		v4l2_warn(&sdev->sd,
+			"%s: device took too much time to answer (%d usec).\n",
+				__func__, usecs);
+
+	/* Clear status bits */
+	err = si4713_send_command(sdev, SI4713_CMD_GET_INT_STATUS,
+					NULL, 0,
+					resp, ARRAY_SIZE(resp),
+					DEFAULT_TIMEOUT);
+
+	if (err < 0)
+		goto exit;
+
+	v4l2_dbg(1, debug, &sdev->sd,
+			"%s: status bits: 0x%02x\n", __func__, resp[0]);
+
+	if (!(resp[0] & SI4713_STC_INT))
+		err = -EIO;
+
+exit:
+	return err;
+}
+
+/*
+ * si4713_tx_tune_freq - Sets the state of the RF carrier and sets the tuning
+ * 			frequency between 76 and 108 MHz in 10 kHz units and
+ * 			steps of 50 kHz.
+ * @sdev: si4713_device structure for the device we are communicating
+ * @frequency: desired frequency (76 - 108 MHz, unit 10 KHz, step 50 kHz)
+ */
+static int si4713_tx_tune_freq(struct si4713_device *sdev, u16 frequency)
+{
+	int err;
+	u8 val[SI4713_TXFREQ_NRESP];
+	/*
+	 * 	.First byte = 0
+	 * 	.Second byte = frequency's MSB
+	 * 	.Third byte = frequency's LSB
+	 */
+	const u8 args[SI4713_TXFREQ_NARGS] = {
+		0x00,
+		msb(frequency),
+		lsb(frequency),
+	};
+
+	err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_FREQ,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (err < 0)
+		return err;
+
+	v4l2_dbg(1, debug, &sdev->sd,
+			"%s: frequency=0x%02x status=0x%02x\n", __func__,
+			frequency, val[0]);
+
+	err = si4713_wait_stc(sdev, TIMEOUT_TX_TUNE);
+	if (err < 0)
+		return err;
+
+	return compose_u16(args[1], args[2]);
+}
+
+/*
+ * si4713_tx_tune_power - Sets the RF voltage level between 88 and 115 dBuV in
+ * 			1 dB units. A value of 0x00 indicates off. The command
+ * 			also sets the antenna tuning capacitance. A value of 0
+ * 			indicates autotuning, and a value of 1 - 191 indicates
+ * 			a manual override, which results in a tuning
+ * 			capacitance of 0.25 pF x @antcap.
+ * @sdev: si4713_device structure for the device we are communicating
+ * @power: tuning power (88 - 115 dBuV, unit/step 1 dB)
+ * @antcap: value of antenna tuning capacitor (0 - 191)
+ */
+static int si4713_tx_tune_power(struct si4713_device *sdev, u8 power,
+				u8 antcap)
+{
+	int err;
+	u8 val[SI4713_TXPWR_NRESP];
+	/*
+	 * 	.First byte = 0
+	 * 	.Second byte = 0
+	 * 	.Third byte = power
+	 * 	.Fourth byte = antcap
+	 */
+	const u8 args[SI4713_TXPWR_NARGS] = {
+		0x00,
+		0x00,
+		power,
+		antcap,
+	};
+
+	if (((power > 0) && (power < SI4713_MIN_POWER)) ||
+		power > SI4713_MAX_POWER || antcap > SI4713_MAX_ANTCAP)
+		return -EDOM;
+
+	err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_POWER,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (err < 0)
+		return err;
+
+	v4l2_dbg(1, debug, &sdev->sd,
+			"%s: power=0x%02x antcap=0x%02x status=0x%02x\n",
+			__func__, power, antcap, val[0]);
+
+	return si4713_wait_stc(sdev, TIMEOUT_TX_TUNE_POWER);
+}
+
+/*
+ * si4713_tx_tune_measure - Enters receive mode and measures the received noise
+ * 			level in units of dBuV on the selected frequency.
+ * 			The Frequency must be between 76 and 108 MHz in 10 kHz
+ * 			units and steps of 50 kHz. The command also sets the
+ * 			antenna	tuning capacitance. A value of 0 means
+ * 			autotuning, and a value of 1 to 191 indicates manual
+ * 			override.
+ * @sdev: si4713_device structure for the device we are communicating
+ * @frequency: desired frequency (76 - 108 MHz, unit 10 KHz, step 50 kHz)
+ * @antcap: value of antenna tuning capacitor (0 - 191)
+ */
+static int si4713_tx_tune_measure(struct si4713_device *sdev, u16 frequency,
+					u8 antcap)
+{
+	int err;
+	u8 val[SI4713_TXMEA_NRESP];
+	/*
+	 * 	.First byte = 0
+	 * 	.Second byte = frequency's MSB
+	 * 	.Third byte = frequency's LSB
+	 * 	.Fourth byte = antcap
+	 */
+	const u8 args[SI4713_TXMEA_NARGS] = {
+		0x00,
+		msb(frequency),
+		lsb(frequency),
+		antcap,
+	};
+
+	sdev->tune_rnl = DEFAULT_TUNE_RNL;
+
+	if (antcap > SI4713_MAX_ANTCAP)
+		return -EDOM;
+
+	err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_MEASURE,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (err < 0)
+		return err;
+
+	v4l2_dbg(1, debug, &sdev->sd,
+			"%s: frequency=0x%02x antcap=0x%02x status=0x%02x\n",
+			__func__, frequency, antcap, val[0]);
+
+	return si4713_wait_stc(sdev, TIMEOUT_TX_TUNE);
+}
+
+/*
+ * si4713_tx_tune_status- Returns the status of the tx_tune_freq, tx_tune_mea or
+ * 			tx_tune_power commands. This command return the current
+ * 			frequency, output voltage in dBuV, the antenna tunning
+ * 			capacitance value and the received noise level. The
+ * 			command also clears the stcint interrupt bit when the
+ * 			first bit of its arguments is high.
+ * @sdev: si4713_device structure for the device we are communicating
+ * @intack: 0x01 to clear the seek/tune complete interrupt status indicator.
+ * @frequency: returned frequency
+ * @power: returned power
+ * @antcap: returned antenna capacitance
+ * @noise: returned noise level
+ */
+static int si4713_tx_tune_status(struct si4713_device *sdev, u8 intack,
+					u16 *frequency,	u8 *power,
+					u8 *antcap, u8 *noise)
+{
+	int err;
+	u8 val[SI4713_TXSTATUS_NRESP];
+	/*
+	 * 	.First byte = intack bit
+	 */
+	const u8 args[SI4713_TXSTATUS_NARGS] = {
+		intack & SI4713_INTACK_MASK,
+	};
+
+	err = si4713_send_command(sdev, SI4713_CMD_TX_TUNE_STATUS,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (!err) {
+		v4l2_dbg(1, debug, &sdev->sd,
+			"%s: status=0x%02x\n", __func__, val[0]);
+		*frequency = compose_u16(val[2], val[3]);
+		sdev->frequency = *frequency;
+		*power = val[5];
+		*antcap = val[6];
+		*noise = val[7];
+		v4l2_dbg(1, debug, &sdev->sd, "%s: response: %d x 10 kHz "
+				"(power %d, antcap %d, rnl %d)\n", __func__,
+				*frequency, *power, *antcap, *noise);
+	}
+
+	return err;
+}
+
+/*
+ * si4713_tx_rds_buff - Loads the RDS group buffer FIFO or circular buffer.
+ * @sdev: si4713_device structure for the device we are communicating
+ * @mode: the buffer operation mode.
+ * @rdsb: RDS Block B
+ * @rdsc: RDS Block C
+ * @rdsd: RDS Block D
+ * @cbleft: returns the number of available circular buffer blocks minus the
+ *          number of used circular buffer blocks.
+ */
+static int si4713_tx_rds_buff(struct si4713_device *sdev, u8 mode, u16 rdsb,
+				u16 rdsc, u16 rdsd, s8 *cbleft)
+{
+	int err;
+	u8 val[SI4713_RDSBUFF_NRESP];
+
+	const u8 args[SI4713_RDSBUFF_NARGS] = {
+		mode & SI4713_RDSBUFF_MODE_MASK,
+		msb(rdsb),
+		lsb(rdsb),
+		msb(rdsc),
+		lsb(rdsc),
+		msb(rdsd),
+		lsb(rdsd),
+	};
+
+	err = si4713_send_command(sdev, SI4713_CMD_TX_RDS_BUFF,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (!err) {
+		v4l2_dbg(1, debug, &sdev->sd,
+			"%s: status=0x%02x\n", __func__, val[0]);
+		*cbleft = (s8)val[2] - val[3];
+		v4l2_dbg(1, debug, &sdev->sd, "%s: response: interrupts"
+				" 0x%02x cb avail: %d cb used %d fifo avail"
+				" %d fifo used %d\n", __func__, val[1],
+				val[2], val[3], val[4], val[5]);
+	}
+
+	return err;
+}
+
+/*
+ * si4713_tx_rds_ps - Loads the program service buffer.
+ * @sdev: si4713_device structure for the device we are communicating
+ * @psid: program service id to be loaded.
+ * @pschar: assumed 4 size char array to be loaded into the program service
+ */
+static int si4713_tx_rds_ps(struct si4713_device *sdev, u8 psid,
+				unsigned char *pschar)
+{
+	int err;
+	u8 val[SI4713_RDSPS_NRESP];
+
+	const u8 args[SI4713_RDSPS_NARGS] = {
+		psid & SI4713_RDSPS_PSID_MASK,
+		pschar[0],
+		pschar[1],
+		pschar[2],
+		pschar[3],
+	};
+
+	err = si4713_send_command(sdev, SI4713_CMD_TX_RDS_PS,
+				  args, ARRAY_SIZE(args), val,
+				  ARRAY_SIZE(val), DEFAULT_TIMEOUT);
+
+	if (err < 0)
+		return err;
+
+	v4l2_dbg(1, debug, &sdev->sd, "%s: status=0x%02x\n", __func__, val[0]);
+
+	return err;
+}
+
+static int si4713_set_power_state(struct si4713_device *sdev, u8 value)
+{
+	int rval;
+
+	mutex_lock(&sdev->mutex);
+
+	if (value)
+		rval = si4713_powerup(sdev);
+	else
+		rval = si4713_powerdown(sdev);
+
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+static int si4713_set_mute(struct si4713_device *sdev, u16 mute)
+{
+	int rval = 0;
+
+	mute = set_mute(mute);
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state)
+		rval = si4713_write_property(sdev,
+				SI4713_TX_LINE_INPUT_MUTE, mute);
+
+	if (rval >= 0)
+		sdev->mute = get_mute(mute);
+
+	mutex_unlock(&sdev->mutex);
+
+	return rval;
+}
+
+static int si4713_set_rds_ps_name(struct si4713_device *sdev, char *ps_name)
+{
+	int rval = 0, i;
+	u8 len = 0;
+
+	/* We want to clear the whole thing */
+	if (!strlen(ps_name))
+		memset(ps_name, 0, MAX_RDS_PS_NAME + 1);
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		/* Write the new ps name and clear the padding */
+		for (i = 0; i < MAX_RDS_PS_NAME; i += (RDS_BLOCK / 2)) {
+			rval = si4713_tx_rds_ps(sdev, (i / (RDS_BLOCK / 2)),
+						ps_name + i);
+			if (rval < 0)
+				goto unlock;
+		}
+
+		/* Setup the size to be sent */
+		if (strlen(ps_name))
+			len = strlen(ps_name) - 1;
+		else
+			len = 1;
+
+		rval = si4713_write_property(sdev,
+				SI4713_TX_RDS_PS_MESSAGE_COUNT,
+				rds_ps_nblocks(len));
+		if (rval < 0)
+			goto unlock;
+
+		rval = si4713_write_property(sdev,
+				SI4713_TX_RDS_PS_REPEAT_COUNT,
+				DEFAULT_RDS_PS_REPEAT_COUNT * 2);
+		if (rval < 0)
+			goto unlock;
+	}
+
+	strncpy(sdev->rds_info.ps_name, ps_name, MAX_RDS_PS_NAME);
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+static int si4713_set_rds_radio_text(struct si4713_device *sdev, char *rt)
+{
+	int rval = 0, i;
+	u16 t_index = 0;
+	u8 b_index = 0, cr_inserted = 0;
+	s8 left;
+
+	mutex_lock(&sdev->mutex);
+
+	if (!sdev->power_state)
+		goto copy;
+
+	rval = si4713_tx_rds_buff(sdev, RDS_BLOCK_CLEAR, 0, 0, 0, &left);
+	if (rval < 0)
+		goto unlock;
+
+	if (!strlen(rt))
+		goto copy;
+
+	do {
+		/* RDS spec says that if the last block isn't used,
+		 * then apply a carriage return
+		 */
+		if (t_index < (RDS_RADIOTEXT_INDEX_MAX *
+			RDS_RADIOTEXT_BLK_SIZE)) {
+			for (i = 0; i < RDS_RADIOTEXT_BLK_SIZE; i++) {
+				if (!rt[t_index + i] || rt[t_index + i] ==
+					RDS_CARRIAGE_RETURN) {
+					rt[t_index + i] = RDS_CARRIAGE_RETURN;
+					cr_inserted = 1;
+					break;
+				}
+			}
+		}
+
+		rval = si4713_tx_rds_buff(sdev, RDS_BLOCK_LOAD,
+				compose_u16(RDS_RADIOTEXT_2A, b_index++),
+				compose_u16(rt[t_index], rt[t_index + 1]),
+				compose_u16(rt[t_index + 2], rt[t_index + 3]),
+				&left);
+		if (rval < 0)
+			goto unlock;
+
+		t_index += RDS_RADIOTEXT_BLK_SIZE;
+
+		if (cr_inserted)
+			break;
+	} while (left > 0);
+
+copy:
+	strncpy(sdev->rds_info.radio_text, rt, MAX_RDS_RADIO_TEXT);
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+static int si4713_choose_econtrol_action(struct si4713_device *sdev, u32 id,
+		u32 **shadow, s32 *bit, s32 *mask, u16 *property, int *mul,
+		unsigned long **table, int *size)
+{
+	s32 rval = 0;
+
+	switch (id) {
+	/* FM_TX class controls */
+	case V4L2_CID_RDS_TX_PI:
+		*property = SI4713_TX_RDS_PI;
+		*mul = 1;
+		*shadow = &sdev->rds_info.pi;
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
+		*property = SI4713_TX_ACOMP_THRESHOLD;
+		*mul = 1;
+		*shadow = &sdev->acomp_info.threshold;
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_GAIN:
+		*property = SI4713_TX_ACOMP_GAIN;
+		*mul = 1;
+		*shadow = &sdev->acomp_info.gain;
+		break;
+	case V4L2_CID_PILOT_TONE_FREQUENCY:
+		*property = SI4713_TX_PILOT_FREQUENCY;
+		*mul = 1;
+		*shadow = &sdev->pilot_info.frequency;
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
+		*property = SI4713_TX_ACOMP_ATTACK_TIME;
+		*mul = ATTACK_TIME_UNIT;
+		*shadow = &sdev->acomp_info.attack_time;
+		break;
+	case V4L2_CID_PILOT_TONE_DEVIATION:
+		*property = SI4713_TX_PILOT_DEVIATION;
+		*mul = 10;
+		*shadow = &sdev->pilot_info.deviation;
+		break;
+	case V4L2_CID_AUDIO_LIMITER_DEVIATION:
+		*property = SI4713_TX_AUDIO_DEVIATION;
+		*mul = 10;
+		*shadow = &sdev->limiter_info.deviation;
+		break;
+	case V4L2_CID_RDS_TX_DEVIATION:
+		*property = SI4713_TX_RDS_DEVIATION;
+		*mul = 1;
+		*shadow = &sdev->rds_info.deviation;
+		break;
+
+	case V4L2_CID_RDS_TX_PTY:
+		*property = SI4713_TX_RDS_PS_MISC;
+		*bit = 5;
+		*mask = 0x1F << 5;
+		*shadow = &sdev->rds_info.pty;
+		break;
+	case V4L2_CID_AUDIO_LIMITER_ENABLED:
+		*property = SI4713_TX_ACOMP_ENABLE;
+		*bit = 1;
+		*mask = 1 << 1;
+		*shadow = &sdev->limiter_info.enabled;
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
+		*property = SI4713_TX_ACOMP_ENABLE;
+		*bit = 0;
+		*mask = 1 << 0;
+		*shadow = &sdev->acomp_info.enabled;
+		break;
+	case V4L2_CID_PILOT_TONE_ENABLED:
+		*property = SI4713_TX_COMPONENT_ENABLE;
+		*bit = 0;
+		*mask = 1 << 0;
+		*shadow = &sdev->pilot_info.enabled;
+		break;
+
+	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
+		*property = SI4713_TX_LIMITER_RELEASE_TIME;
+		*table = limiter_times;
+		*size = ARRAY_SIZE(limiter_times);
+		*shadow = &sdev->limiter_info.release_time;
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
+		*property = SI4713_TX_ACOMP_RELEASE_TIME;
+		*table = acomp_rtimes;
+		*size = ARRAY_SIZE(acomp_rtimes);
+		*shadow = &sdev->acomp_info.release_time;
+		break;
+	case V4L2_CID_TUNE_PREEMPHASIS:
+		*property = SI4713_TX_PREEMPHASIS;
+		*table = preemphasis_values;
+		*size = ARRAY_SIZE(preemphasis_values);
+		*shadow = &sdev->preemphasis;
+		break;
+
+	default:
+		rval = -EINVAL;
+	};
+
+	return rval;
+}
+
+static int si4713_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
+
+/* write string property */
+static int si4713_write_econtrol_string(struct si4713_device *sdev,
+				struct v4l2_ext_control *control)
+{
+	struct v4l2_queryctrl vqc;
+	int len;
+	s32 rval = 0;
+
+	vqc.id = control->id;
+	rval = si4713_queryctrl(&sdev->sd, &vqc);
+	if (rval < 0)
+		goto exit;
+
+	switch (control->id) {
+	case V4L2_CID_RDS_TX_PS_NAME: {
+		char ps_name[MAX_RDS_PS_NAME + 1];
+
+		len = control->size - 1;
+		if (len > MAX_RDS_PS_NAME) {
+			rval = -ERANGE;
+			goto exit;
+		}
+		rval = copy_from_user(ps_name, control->string, len);
+		if (rval < 0)
+			goto exit;
+		ps_name[len] = '\0';
+
+		if (strlen(ps_name) % vqc.step) {
+			rval = -ERANGE;
+			goto exit;
+		}
+
+		rval = si4713_set_rds_ps_name(sdev, ps_name);
+	}
+		break;
+
+	case V4L2_CID_RDS_TX_RADIO_TEXT: {
+		char radio_text[MAX_RDS_RADIO_TEXT + 1];
+
+		len = control->size - 1;
+		if (len > MAX_RDS_RADIO_TEXT) {
+			rval = -ERANGE;
+			goto exit;
+		}
+		rval = copy_from_user(radio_text, control->string, len);
+		if (rval < 0)
+			goto exit;
+		radio_text[len] = '\0';
+
+		if (strlen(radio_text) % vqc.step) {
+			rval = -ERANGE;
+			goto exit;
+		}
+
+		rval = si4713_set_rds_radio_text(sdev, radio_text);
+	}
+		break;
+
+	default:
+		rval = -EINVAL;
+		break;
+	};
+
+exit:
+	return rval;
+}
+
+static int validate_range(struct v4l2_subdev *sd,
+					struct v4l2_ext_control *control)
+{
+	struct v4l2_queryctrl vqc;
+	int rval;
+
+	vqc.id = control->id;
+	rval = si4713_queryctrl(sd, &vqc);
+	if (rval < 0)
+		goto exit;
+
+	if (control->value < vqc.minimum || control->value > vqc.maximum)
+		rval = -ERANGE;
+
+exit:
+	return rval;
+}
+
+/* properties which use tx_tune_power*/
+static int si4713_write_econtrol_tune(struct si4713_device *sdev,
+				struct v4l2_ext_control *control)
+{
+	s32 rval = 0;
+	u8 power, antcap;
+
+	rval = validate_range(&sdev->sd, control);
+	if (rval < 0)
+		goto exit;
+
+	mutex_lock(&sdev->mutex);
+
+	switch (control->id) {
+	case V4L2_CID_TUNE_POWER_LEVEL:
+		power = control->value;
+		antcap = sdev->antenna_capacitor;
+		break;
+	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		power = sdev->power_level;
+		antcap = control->value;
+		break;
+	default:
+		rval = -EINVAL;
+		goto unlock;
+	};
+
+	if (sdev->power_state)
+		rval = si4713_tx_tune_power(sdev, power, antcap);
+
+	if (rval == 0) {
+		sdev->power_level = power;
+		sdev->antenna_capacitor = antcap;
+	}
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+exit:
+	return rval;
+}
+
+static int si4713_write_econtrol_integers(struct si4713_device *sdev,
+					struct v4l2_ext_control *control)
+{
+	s32 rval;
+	u32 *shadow = NULL, val = 0;
+	s32 bit = 0, mask = 0;
+	u16 property = 0;
+	int mul = 0;
+	unsigned long *table = NULL;
+	int size = 0;
+
+	rval = validate_range(&sdev->sd, control);
+	if (rval < 0)
+		goto exit;
+
+	rval = si4713_choose_econtrol_action(sdev, control->id, &shadow, &bit,
+			&mask, &property, &mul, &table, &size);
+	if (rval < 0)
+		goto exit;
+
+	val = control->value;
+	if (mul) {
+		val = control->value / mul;
+	} else if (table) {
+		rval = usecs_to_dev(control->value, table, size);
+		if (rval < 0)
+			goto exit;
+		val = rval;
+		rval = 0;
+	}
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		if (mask) {
+			rval = si4713_read_property(sdev, property, &val);
+			if (rval < 0)
+				goto unlock;
+			val = set_bits(val, control->value, bit, mask);
+		}
+
+		rval = si4713_write_property(sdev, property, val);
+		if (rval < 0)
+			goto unlock;
+		if (mask)
+			val = control->value;
+	}
+
+	if (mul) {
+		*shadow = val * mul;
+	} else if (table) {
+		rval = dev_to_usecs(val, table, size);
+		if (rval < 0)
+			goto unlock;
+		*shadow = rval;
+		rval = 0;
+	} else {
+		*shadow = val;
+	}
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+exit:
+	return rval;
+}
+
+static int si4713_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f);
+static int si4713_s_modulator(struct v4l2_subdev *sd, struct v4l2_modulator *);
+/*
+ * si4713_setup - Sets the device up with current configuration.
+ * @sdev: si4713_device structure for the device we are communicating
+ */
+static int si4713_setup(struct si4713_device *sdev)
+{
+	struct v4l2_ext_control ctrl;
+	struct v4l2_frequency f;
+	struct v4l2_modulator vm;
+	struct si4713_device *tmp;
+	int rval = 0;
+
+	tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	/* Get a local copy to avoid race */
+	mutex_lock(&sdev->mutex);
+	memcpy(tmp, sdev, sizeof(*sdev));
+	mutex_unlock(&sdev->mutex);
+
+	ctrl.id = V4L2_CID_RDS_TX_PI;
+	ctrl.value = tmp->rds_info.pi;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_COMPRESSION_THRESHOLD;
+	ctrl.value = tmp->acomp_info.threshold;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_COMPRESSION_GAIN;
+	ctrl.value = tmp->acomp_info.gain;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_PILOT_TONE_FREQUENCY;
+	ctrl.value = tmp->pilot_info.frequency;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME;
+	ctrl.value = tmp->acomp_info.attack_time;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_PILOT_TONE_DEVIATION;
+	ctrl.value = tmp->pilot_info.deviation;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_LIMITER_DEVIATION;
+	ctrl.value = tmp->limiter_info.deviation;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_RDS_TX_DEVIATION;
+	ctrl.value = tmp->rds_info.deviation;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_RDS_TX_PTY;
+	ctrl.value = tmp->rds_info.pty;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_LIMITER_ENABLED;
+	ctrl.value = tmp->limiter_info.enabled;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_COMPRESSION_ENABLED;
+	ctrl.value = tmp->acomp_info.enabled;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_PILOT_TONE_ENABLED;
+	ctrl.value = tmp->pilot_info.enabled;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_LIMITER_RELEASE_TIME;
+	ctrl.value = tmp->limiter_info.release_time;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME;
+	ctrl.value = tmp->acomp_info.release_time;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_TUNE_PREEMPHASIS;
+	ctrl.value = tmp->preemphasis;
+	rval |= si4713_write_econtrol_integers(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_RDS_TX_PS_NAME;
+	rval |= si4713_set_rds_ps_name(sdev, tmp->rds_info.ps_name);
+
+	ctrl.id = V4L2_CID_RDS_TX_RADIO_TEXT;
+	rval |= si4713_set_rds_radio_text(sdev, tmp->rds_info.radio_text);
+
+	/* Device procedure needs to set frequency first */
+	f.frequency = tmp->frequency ? tmp->frequency : DEFAULT_FREQUENCY;
+	f.frequency = si4713_to_v4l2(f.frequency);
+	rval |= si4713_s_frequency(&sdev->sd, &f);
+
+	ctrl.id = V4L2_CID_TUNE_POWER_LEVEL;
+	ctrl.value = tmp->power_level;
+	rval |= si4713_write_econtrol_tune(sdev, &ctrl);
+
+	ctrl.id = V4L2_CID_TUNE_ANTENNA_CAPACITOR;
+	ctrl.value = tmp->antenna_capacitor;
+	rval |= si4713_write_econtrol_tune(sdev, &ctrl);
+
+	vm.index = 0;
+	if (tmp->stereo)
+		vm.txsubchans = V4L2_TUNER_SUB_STEREO;
+	else
+		vm.txsubchans = V4L2_TUNER_SUB_MONO;
+	if (tmp->rds_info.enabled)
+		vm.txsubchans |= V4L2_TUNER_SUB_RDS;
+	si4713_s_modulator(&sdev->sd, &vm);
+
+	kfree(tmp);
+
+	return rval;
+}
+
+/*
+ * si4713_initialize - Sets the device up with default configuration.
+ * @sdev: si4713_device structure for the device we are communicating
+ */
+static int si4713_initialize(struct si4713_device *sdev)
+{
+	int rval;
+
+	rval = si4713_set_power_state(sdev, POWER_ON);
+	if (rval < 0)
+		goto exit;
+
+	rval = si4713_checkrev(sdev);
+	if (rval < 0)
+		goto exit;
+
+	rval = si4713_set_power_state(sdev, POWER_OFF);
+	if (rval < 0)
+		goto exit;
+
+	mutex_lock(&sdev->mutex);
+
+	sdev->rds_info.pi = DEFAULT_RDS_PI;
+	sdev->rds_info.pty = DEFAULT_RDS_PTY;
+	sdev->rds_info.deviation = DEFAULT_RDS_DEVIATION;
+	strlcpy(sdev->rds_info.ps_name, DEFAULT_RDS_PS_NAME, MAX_RDS_PS_NAME);
+	strlcpy(sdev->rds_info.radio_text, DEFAULT_RDS_RADIO_TEXT,
+							MAX_RDS_RADIO_TEXT);
+	sdev->rds_info.enabled = 1;
+
+	sdev->limiter_info.release_time = DEFAULT_LIMITER_RTIME;
+	sdev->limiter_info.deviation = DEFAULT_LIMITER_DEV;
+	sdev->limiter_info.enabled = 1;
+
+	sdev->pilot_info.deviation = DEFAULT_PILOT_DEVIATION;
+	sdev->pilot_info.frequency = DEFAULT_PILOT_FREQUENCY;
+	sdev->pilot_info.enabled = 1;
+
+	sdev->acomp_info.release_time = DEFAULT_ACOMP_RTIME;
+	sdev->acomp_info.attack_time = DEFAULT_ACOMP_ATIME;
+	sdev->acomp_info.threshold = DEFAULT_ACOMP_THRESHOLD;
+	sdev->acomp_info.gain = DEFAULT_ACOMP_GAIN;
+	sdev->acomp_info.enabled = 1;
+
+	sdev->frequency = DEFAULT_FREQUENCY;
+	sdev->preemphasis = DEFAULT_PREEMPHASIS;
+	sdev->mute = DEFAULT_MUTE;
+	sdev->power_level = DEFAULT_POWER_LEVEL;
+	sdev->antenna_capacitor = 0;
+	sdev->stereo = 1;
+	sdev->tune_rnl = DEFAULT_TUNE_RNL;
+
+	mutex_unlock(&sdev->mutex);
+
+exit:
+	return rval;
+}
+
+/* read string property */
+static int si4713_read_econtrol_string(struct si4713_device *sdev,
+				struct v4l2_ext_control *control)
+{
+	s32 rval = 0;
+
+	switch (control->id) {
+	case V4L2_CID_RDS_TX_PS_NAME:
+		if (strlen(sdev->rds_info.ps_name) + 1 > control->size) {
+			control->size = MAX_RDS_PS_NAME + 1;
+			rval = -ENOSPC;
+			goto exit;
+		}
+		rval = copy_to_user(control->string, sdev->rds_info.ps_name,
+					strlen(sdev->rds_info.ps_name) + 1);
+		break;
+
+	case V4L2_CID_RDS_TX_RADIO_TEXT:
+		if (strlen(sdev->rds_info.radio_text) + 1 > control->size) {
+			control->size = MAX_RDS_RADIO_TEXT + 1;
+			rval = -ENOSPC;
+			goto exit;
+		}
+		rval = copy_to_user(control->string, sdev->rds_info.radio_text,
+					strlen(sdev->rds_info.radio_text) + 1);
+		break;
+
+	default:
+		rval = -EINVAL;
+		break;
+	};
+
+exit:
+	return rval;
+}
+
+/*
+ * si4713_update_tune_status - update properties from tx_tune_status
+ * command. Must be called with sdev->mutex held.
+ * @sdev: si4713_device structure for the device we are communicating
+ */
+static int si4713_update_tune_status(struct si4713_device *sdev)
+{
+	int rval;
+	u16 f = 0;
+	u8 p = 0, a = 0, n = 0;
+
+	rval = si4713_tx_tune_status(sdev, 0x00, &f, &p, &a, &n);
+
+	if (rval < 0)
+		goto exit;
+
+	sdev->power_level = p;
+	sdev->antenna_capacitor = a;
+	sdev->tune_rnl = n;
+
+exit:
+	return rval;
+}
+
+/* properties which use tx_tune_status */
+static int si4713_read_econtrol_tune(struct si4713_device *sdev,
+				struct v4l2_ext_control *control)
+{
+	s32 rval = 0;
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		rval = si4713_update_tune_status(sdev);
+		if (rval < 0)
+			goto unlock;
+	}
+
+	switch (control->id) {
+	case V4L2_CID_TUNE_POWER_LEVEL:
+		control->value = sdev->power_level;
+		break;
+	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		control->value = sdev->antenna_capacitor;
+		break;
+	default:
+		rval = -EINVAL;
+	};
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+static int si4713_read_econtrol_integers(struct si4713_device *sdev,
+				struct v4l2_ext_control *control)
+{
+	s32 rval;
+	u32 *shadow = NULL, val = 0;
+	s32 bit = 0, mask = 0;
+	u16 property = 0;
+	int mul = 0;
+	unsigned long *table = NULL;
+	int size = 0;
+
+	rval = si4713_choose_econtrol_action(sdev, control->id, &shadow, &bit,
+			&mask, &property, &mul, &table, &size);
+	if (rval < 0)
+		goto exit;
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		rval = si4713_read_property(sdev, property, &val);
+		if (rval < 0)
+			goto unlock;
+
+		/* Keep negative values for threshold */
+		if (control->id == V4L2_CID_AUDIO_COMPRESSION_THRESHOLD)
+			*shadow = (s16)val;
+		else if (mask)
+			*shadow = get_status_bit(val, bit, mask);
+		else if (mul)
+			*shadow = val * mul;
+		else
+			*shadow = dev_to_usecs(val, table, size);
+	}
+
+	control->value = *shadow;
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+exit:
+	return rval;
+}
+
+/*
+ * Video4Linux Subdev Interface
+ */
+/* si4713_s_ext_ctrls - set extended controls value */
+static int si4713_s_ext_ctrls(struct v4l2_subdev *sd,
+				struct v4l2_ext_controls *ctrls)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int i;
+
+	if (ctrls->ctrl_class != V4L2_CTRL_CLASS_FM_TX)
+		return -EINVAL;
+
+	for (i = 0; i < ctrls->count; i++) {
+		int err;
+
+		switch ((ctrls->controls + i)->id) {
+		case V4L2_CID_RDS_TX_PS_NAME:
+		case V4L2_CID_RDS_TX_RADIO_TEXT:
+			err = si4713_write_econtrol_string(sdev,
+							ctrls->controls + i);
+			break;
+		case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		case V4L2_CID_TUNE_POWER_LEVEL:
+			err = si4713_write_econtrol_tune(sdev,
+							ctrls->controls + i);
+			break;
+		default:
+			err = si4713_write_econtrol_integers(sdev,
+							ctrls->controls + i);
+		}
+
+		if (err < 0) {
+			ctrls->error_idx = i;
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+/* si4713_g_ext_ctrls - get extended controls value */
+static int si4713_g_ext_ctrls(struct v4l2_subdev *sd,
+				struct v4l2_ext_controls *ctrls)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int i;
+
+	if (ctrls->ctrl_class != V4L2_CTRL_CLASS_FM_TX)
+		return -EINVAL;
+
+	for (i = 0; i < ctrls->count; i++) {
+		int err;
+
+		switch ((ctrls->controls + i)->id) {
+		case V4L2_CID_RDS_TX_PS_NAME:
+		case V4L2_CID_RDS_TX_RADIO_TEXT:
+			err = si4713_read_econtrol_string(sdev,
+							ctrls->controls + i);
+			break;
+		case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		case V4L2_CID_TUNE_POWER_LEVEL:
+			err = si4713_read_econtrol_tune(sdev,
+							ctrls->controls + i);
+			break;
+		default:
+			err = si4713_read_econtrol_integers(sdev,
+							ctrls->controls + i);
+		}
+
+		if (err < 0) {
+			ctrls->error_idx = i;
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+/* si4713_queryctrl - enumerate control items */
+static int si4713_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
+{
+	int rval = 0;
+
+	switch (qc->id) {
+	/* User class controls */
+	case V4L2_CID_AUDIO_MUTE:
+		rval = v4l2_ctrl_query_fill(qc, 0, 1, 1, DEFAULT_MUTE);
+		break;
+	/* FM_TX class controls */
+	case V4L2_CID_RDS_TX_PI:
+		rval = v4l2_ctrl_query_fill(qc, 0, 0xFFFF, 1, DEFAULT_RDS_PI);
+		break;
+	case V4L2_CID_RDS_TX_PTY:
+		rval = v4l2_ctrl_query_fill(qc, 0, 31, 1, DEFAULT_RDS_PTY);
+		break;
+	case V4L2_CID_RDS_TX_DEVIATION:
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_RDS_DEVIATION,
+						10, DEFAULT_RDS_DEVIATION);
+		break;
+	case V4L2_CID_RDS_TX_PS_NAME:
+		/*
+		 * Report step as 8. From RDS spec, psname
+		 * should be 8. But there are receivers which scroll strings
+		 * sized as 8xN.
+		 */
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_RDS_PS_NAME, 8, 0);
+		break;
+	case V4L2_CID_RDS_TX_RADIO_TEXT:
+		/*
+		 * Report step as 32 (2A block). From RDS spec,
+		 * radio text should be 32 for 2A block. But there are receivers
+		 * which scroll strings sized as 32xN. Setting default to 32.
+		 */
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_RDS_RADIO_TEXT, 32, 0);
+		break;
+
+	case V4L2_CID_AUDIO_LIMITER_ENABLED:
+		rval = v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
+		break;
+	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
+		rval = v4l2_ctrl_query_fill(qc, 250, MAX_LIMITER_RELEASE_TIME,
+						50, DEFAULT_LIMITER_RTIME);
+		break;
+	case V4L2_CID_AUDIO_LIMITER_DEVIATION:
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_LIMITER_DEVIATION,
+						10, DEFAULT_LIMITER_DEV);
+		break;
+
+	case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
+		rval = v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_GAIN:
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_ACOMP_GAIN, 1,
+						DEFAULT_ACOMP_GAIN);
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
+		rval = v4l2_ctrl_query_fill(qc, MIN_ACOMP_THRESHOLD,
+						MAX_ACOMP_THRESHOLD, 1,
+						DEFAULT_ACOMP_THRESHOLD);
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_ACOMP_ATTACK_TIME,
+						500, DEFAULT_ACOMP_ATIME);
+		break;
+	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
+		rval = v4l2_ctrl_query_fill(qc, 100000, MAX_ACOMP_RELEASE_TIME,
+						100000, DEFAULT_ACOMP_RTIME);
+		break;
+
+	case V4L2_CID_PILOT_TONE_ENABLED:
+		rval = v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
+		break;
+	case V4L2_CID_PILOT_TONE_DEVIATION:
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_PILOT_DEVIATION,
+						10, DEFAULT_PILOT_DEVIATION);
+		break;
+	case V4L2_CID_PILOT_TONE_FREQUENCY:
+		rval = v4l2_ctrl_query_fill(qc, 0, MAX_PILOT_FREQUENCY,
+						1, DEFAULT_PILOT_FREQUENCY);
+		break;
+
+	case V4L2_CID_TUNE_PREEMPHASIS:
+		rval = v4l2_ctrl_query_fill(qc, V4L2_PREEMPHASIS_DISABLED,
+						V4L2_PREEMPHASIS_75_uS, 1,
+						V4L2_PREEMPHASIS_50_uS);
+		break;
+	case V4L2_CID_TUNE_POWER_LEVEL:
+		rval = v4l2_ctrl_query_fill(qc, 0, 120, 1, DEFAULT_POWER_LEVEL);
+		break;
+	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		rval = v4l2_ctrl_query_fill(qc, 0, 191, 1, 0);
+		break;
+	default:
+		rval = -EINVAL;
+		break;
+	};
+
+	return rval;
+}
+
+/* si4713_g_ctrl - get the value of a control */
+static int si4713_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int rval = 0;
+
+	if (!sdev)
+		return -ENODEV;
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		rval = si4713_read_property(sdev, SI4713_TX_LINE_INPUT_MUTE,
+						&sdev->mute);
+
+		if (rval < 0)
+			goto unlock;
+	}
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		ctrl->value = get_mute(sdev->mute);
+		break;
+	}
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+/* si4713_s_ctrl - set the value of a control */
+static int si4713_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int rval = 0;
+
+	if (!sdev)
+		return -ENODEV;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_MUTE:
+		if (ctrl->value) {
+			rval = si4713_set_mute(sdev, ctrl->value);
+			if (rval < 0)
+				goto exit;
+
+			rval = si4713_set_power_state(sdev, POWER_DOWN);
+		} else {
+			rval = si4713_set_power_state(sdev, POWER_UP);
+			if (rval < 0)
+				goto exit;
+
+			rval = si4713_setup(sdev);
+			if (rval < 0)
+				goto exit;
+
+			rval = si4713_set_mute(sdev, ctrl->value);
+		}
+		break;
+	}
+
+exit:
+	return rval;
+}
+
+/* si4713_ioctl - deal with private ioctls (only rnl for now) */
+long si4713_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	struct si4713_rnl *rnl = arg;
+	u16 frequency;
+	int rval = 0;
+
+	if (!arg)
+		return -EINVAL;
+
+	mutex_lock(&sdev->mutex);
+	switch (cmd) {
+	case SI4713_IOC_MEASURE_RNL:
+		frequency = v4l2_to_si4713(rnl->frequency);
+
+		if (sdev->power_state) {
+			/* Set desired measurement frequency */
+			rval = si4713_tx_tune_measure(sdev, frequency, 0);
+			if (rval < 0)
+				goto unlock;
+			/* get results from tune status */
+			rval = si4713_update_tune_status(sdev);
+			if (rval < 0)
+				goto unlock;
+		}
+		rnl->rnl = sdev->tune_rnl;
+		break;
+
+	default:
+		/* nothing */
+		rval = -ENOIOCTLCMD;
+	}
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+static const struct v4l2_subdev_core_ops si4713_subdev_core_ops = {
+	.queryctrl	= si4713_queryctrl,
+	.g_ext_ctrls	= si4713_g_ext_ctrls,
+	.s_ext_ctrls	= si4713_s_ext_ctrls,
+	.g_ctrl		= si4713_g_ctrl,
+	.s_ctrl		= si4713_s_ctrl,
+	.ioctl		= si4713_ioctl,
+};
+
+/* si4713_g_modulator - get modulator attributes */
+static int si4713_g_modulator(struct v4l2_subdev *sd, struct v4l2_modulator *vm)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int rval = 0;
+
+	if (!sdev) {
+		rval = -ENODEV;
+		goto exit;
+	}
+
+	if (vm->index > 0) {
+		rval = -EINVAL;
+		goto exit;
+	}
+
+	strncpy(vm->name, "FM Modulator", 32);
+	vm->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW |
+						V4L2_TUNER_CAP_RDS;
+
+	/* Report current frequency range limits */
+	vm->rangelow = si4713_to_v4l2(FREQ_RANGE_LOW);
+	vm->rangehigh = si4713_to_v4l2(FREQ_RANGE_HIGH);
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		u32 comp_en = 0;
+
+		rval = si4713_read_property(sdev, SI4713_TX_COMPONENT_ENABLE,
+						&comp_en);
+		if (rval < 0)
+			goto unlock;
+
+		sdev->stereo = get_status_bit(comp_en, 1, 1 << 1);
+		sdev->rds_info.enabled = get_status_bit(comp_en, 2, 1 << 2);
+	}
+
+	/* Report current audio mode: mono or stereo */
+	if (sdev->stereo)
+		vm->txsubchans = V4L2_TUNER_SUB_STEREO;
+	else
+		vm->txsubchans = V4L2_TUNER_SUB_MONO;
+
+	/* Report rds feature status */
+	if (sdev->rds_info.enabled)
+		vm->txsubchans |= V4L2_TUNER_SUB_RDS;
+	else
+		vm->txsubchans &= ~V4L2_TUNER_SUB_RDS;
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+exit:
+	return rval;
+}
+
+/* si4713_s_modulator - set modulator attributes */
+static int si4713_s_modulator(struct v4l2_subdev *sd, struct v4l2_modulator *vm)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int rval = 0;
+	u16 stereo, rds;
+	u32 p;
+
+	if (!sdev) {
+		rval = -ENODEV;
+		goto exit;
+	}
+
+	if (vm->index > 0) {
+		rval = -EINVAL;
+		goto exit;
+	}
+
+	/* Set audio mode: mono or stereo */
+	if (vm->txsubchans & V4L2_TUNER_SUB_STEREO)
+		stereo = 1;
+	else if (vm->txsubchans & V4L2_TUNER_SUB_MONO)
+		stereo = 0;
+	else
+		rval = -EINVAL;
+	if (rval < 0)
+		goto exit;
+
+	rds = !!(vm->txsubchans & V4L2_TUNER_SUB_RDS);
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		rval = si4713_read_property(sdev,
+						SI4713_TX_COMPONENT_ENABLE, &p);
+		if (rval < 0)
+			goto unlock;
+
+		p = set_bits(p, stereo, 1, 1 << 1);
+		p = set_bits(p, rds, 2, 1 << 2);
+
+		rval = si4713_write_property(sdev,
+						SI4713_TX_COMPONENT_ENABLE, p);
+		if (rval < 0)
+			goto unlock;
+	}
+
+	sdev->stereo = stereo;
+	sdev->rds_info.enabled = rds;
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+exit:
+	return rval;
+}
+
+/* si4713_g_frequency - get tuner or modulator radio frequency */
+static int si4713_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int rval = 0;
+
+	f->type = V4L2_TUNER_RADIO;
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		u16 freq;
+		u8 p, a, n;
+
+		rval = si4713_tx_tune_status(sdev, 0x00, &freq, &p, &a, &n);
+		if (rval < 0)
+			goto unlock;
+
+		sdev->frequency = freq;
+	}
+
+	f->frequency = si4713_to_v4l2(sdev->frequency);
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+/* si4713_s_frequency - set tuner or modulator radio frequency */
+static int si4713_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
+{
+	struct si4713_device *sdev = to_si4713_device(sd);
+	int rval = 0;
+	u16 frequency = v4l2_to_si4713(f->frequency);
+
+	/* Check frequency range */
+	if (frequency < FREQ_RANGE_LOW || frequency > FREQ_RANGE_HIGH)
+		return -EDOM;
+
+	mutex_lock(&sdev->mutex);
+
+	if (sdev->power_state) {
+		rval = si4713_tx_tune_freq(sdev, frequency);
+		if (rval < 0)
+			goto unlock;
+		frequency = rval;
+		rval = 0;
+	}
+	sdev->frequency = frequency;
+	f->frequency = si4713_to_v4l2(frequency);
+
+unlock:
+	mutex_unlock(&sdev->mutex);
+	return rval;
+}
+
+static const struct v4l2_subdev_tuner_ops si4713_subdev_tuner_ops = {
+	.g_frequency	= si4713_g_frequency,
+	.s_frequency	= si4713_s_frequency,
+	.g_modulator	= si4713_g_modulator,
+	.s_modulator	= si4713_s_modulator,
+};
+
+static const struct v4l2_subdev_ops si4713_subdev_ops = {
+	.core		= &si4713_subdev_core_ops,
+	.tuner		= &si4713_subdev_tuner_ops,
+};
+
+/*
+ * I2C driver interface
+ */
+/* si4713_probe - probe for the device */
+static int si4713_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	struct si4713_device *sdev;
+	int rval;
+
+	sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
+	if (!sdev) {
+		dev_err(&client->dev, "Failed to alloc video device.\n");
+		rval = -ENOMEM;
+		goto exit;
+	}
+
+	sdev->platform_data = client->dev.platform_data;
+	if (!sdev->platform_data) {
+		v4l2_err(&sdev->sd, "No platform data registered.\n");
+		rval = -ENODEV;
+		goto free_sdev;
+	}
+
+	v4l2_i2c_subdev_init(&sdev->sd, client, &si4713_subdev_ops);
+
+	mutex_init(&sdev->mutex);
+	init_completion(&sdev->work);
+
+	if (client->irq) {
+		rval = request_irq(client->irq,
+			si4713_handler, IRQF_TRIGGER_FALLING | IRQF_DISABLED,
+			client->name, sdev);
+		if (rval < 0) {
+			v4l2_err(&sdev->sd, "Could not request IRQ\n");
+			goto free_sdev;
+		}
+		v4l2_dbg(1, debug, &sdev->sd, "IRQ requested.\n");
+	} else {
+		v4l2_warn(&sdev->sd, "IRQ not configured. Using timeouts.\n");
+	}
+
+	rval = si4713_initialize(sdev);
+	if (rval < 0) {
+		v4l2_err(&sdev->sd, "Failed to probe device information.\n");
+		goto free_irq;
+	}
+
+	return 0;
+
+free_irq:
+	if (client->irq)
+		free_irq(client->irq, sdev);
+free_sdev:
+	kfree(sdev);
+exit:
+	return rval;
+}
+
+/* si4713_remove - remove the device */
+static int si4713_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct si4713_device *sdev = to_si4713_device(sd);
+
+	if (sdev->power_state)
+		si4713_set_power_state(sdev, POWER_DOWN);
+
+	if (client->irq > 0)
+		free_irq(client->irq, sdev);
+
+	v4l2_device_unregister_subdev(sd);
+
+	kfree(sdev);
+
+	return 0;
+}
+
+/* si4713_i2c_driver - i2c driver interface */
+static const struct i2c_device_id si4713_id[] = {
+	{ "si4713" , 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, si4713_id);
+
+static struct i2c_driver si4713_i2c_driver = {
+	.driver		= {
+		.name	= "si4713",
+	},
+	.probe		= si4713_probe,
+	.remove         = si4713_remove,
+	.id_table       = si4713_id,
+};
+
+/* Module Interface */
+static int __init si4713_module_init(void)
+{
+	return i2c_add_driver(&si4713_i2c_driver);
+}
+
+static void __exit si4713_module_exit(void)
+{
+	i2c_del_driver(&si4713_i2c_driver);
+}
+
+module_init(si4713_module_init);
+module_exit(si4713_module_exit);
+