drivers/media/common/tuners/tea5767.c - fp2-dev/kernel/msm - Gitiles

 /*
  * For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
  * I2C address is allways 0xC0.
  *
  *
  * Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@infradead.org)
  * This code is placed under the terms of the GNU General Public License
  *
  * tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
  * from their contributions on DScaler.
  */

 #include <linux/i2c.h>
 #include <linux/delay.h>
 #include <linux/videodev2.h>
 #include "tuner-i2c.h"
 #include "tea5767.h"

 static int debug;
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "enable verbose debug messages");

 /*****************************************************************************/

 struct tea5767_priv {
 	struct tuner_i2c_props	i2c_props;
 	u32			frequency;
 	struct tea5767_ctrl	ctrl;
 };

 /*****************************************************************************/

 /******************************
  * Write mode register values *
  ******************************/

 /* First register */
 #define TEA5767_MUTE		0x80	/* Mutes output */
 #define TEA5767_SEARCH		0x40	/* Activates station search */
 /* Bits 0-5 for divider MSB */

 /* Second register */
 /* Bits 0-7 for divider LSB */

 /* Third register */

 /* Station search from botton to up */
 #define TEA5767_SEARCH_UP	0x80

 /* Searches with ADC output = 10 */
 #define TEA5767_SRCH_HIGH_LVL	0x60

 /* Searches with ADC output = 10 */
 #define TEA5767_SRCH_MID_LVL	0x40

 /* Searches with ADC output = 5 */
 #define TEA5767_SRCH_LOW_LVL	0x20

 /* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
 #define TEA5767_HIGH_LO_INJECT	0x10

 /* Disable stereo */
 #define TEA5767_MONO		0x08

 /* Disable right channel and turns to mono */
 #define TEA5767_MUTE_RIGHT	0x04

 /* Disable left channel and turns to mono */
 #define TEA5767_MUTE_LEFT	0x02

 #define TEA5767_PORT1_HIGH	0x01

 /* Fourth register */
 #define TEA5767_PORT2_HIGH	0x80
 /* Chips stops working. Only I2C bus remains on */
 #define TEA5767_STDBY		0x40

 /* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
 #define TEA5767_JAPAN_BAND	0x20

 /* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
 #define TEA5767_XTAL_32768	0x10

 /* Cuts weak signals */
 #define TEA5767_SOFT_MUTE	0x08

 /* Activates high cut control */
 #define TEA5767_HIGH_CUT_CTRL	0x04

 /* Activates stereo noise control */
 #define TEA5767_ST_NOISE_CTL	0x02

 /* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
 #define TEA5767_SRCH_IND	0x01

 /* Fifth register */

 /* By activating, it will use Xtal at 13 MHz as reference for divider */
 #define TEA5767_PLLREF_ENABLE	0x80

 /* By activating, deemphasis=50, or else, deemphasis of 50us */
 #define TEA5767_DEEMPH_75	0X40

 /*****************************
  * Read mode register values *
  *****************************/

 /* First register */
 #define TEA5767_READY_FLAG_MASK	0x80
 #define TEA5767_BAND_LIMIT_MASK	0X40
 /* Bits 0-5 for divider MSB after search or preset */

 /* Second register */
 /* Bits 0-7 for divider LSB after search or preset */

 /* Third register */
 #define TEA5767_STEREO_MASK	0x80
 #define TEA5767_IF_CNTR_MASK	0x7f

 /* Fourth register */
 #define TEA5767_ADC_LEVEL_MASK	0xf0

 /* should be 0 */
 #define TEA5767_CHIP_ID_MASK	0x0f

 /* Fifth register */
 /* Reserved for future extensions */
 #define TEA5767_RESERVED_MASK	0xff

 /*****************************************************************************/

 static void tea5767_status_dump(struct tea5767_priv *priv,
 				unsigned char *buffer)
 {
 	unsigned int div, frq;

 	if (TEA5767_READY_FLAG_MASK & buffer[0])
 		tuner_info("Ready Flag ON\n");
 	else
 		tuner_info("Ready Flag OFF\n");

 	if (TEA5767_BAND_LIMIT_MASK & buffer[0])
 		tuner_info("Tuner at band limit\n");
 	else
 		tuner_info("Tuner not at band limit\n");

 	div = ((buffer[0] & 0x3f) << 8) | buffer[1];

 	switch (priv->ctrl.xtal_freq) {
 	case TEA5767_HIGH_LO_13MHz:
 		frq = (div * 50000 - 700000 - 225000) / 4;	/* Freq in KHz */
 		break;
 	case TEA5767_LOW_LO_13MHz:
 		frq = (div * 50000 + 700000 + 225000) / 4;	/* Freq in KHz */
 		break;
 	case TEA5767_LOW_LO_32768:
 		frq = (div * 32768 + 700000 + 225000) / 4;	/* Freq in KHz */
 		break;
 	case TEA5767_HIGH_LO_32768:
 	default:
 		frq = (div * 32768 - 700000 - 225000) / 4;	/* Freq in KHz */
 		break;
 	}
 	buffer[0] = (div >> 8) & 0x3f;
 	buffer[1] = div & 0xff;

 	tuner_info("Frequency %d.%03d KHz (divider = 0x%04x)\n",
 		   frq / 1000, frq % 1000, div);

 	if (TEA5767_STEREO_MASK & buffer[2])
 		tuner_info("Stereo\n");
 	else
 		tuner_info("Mono\n");

 	tuner_info("IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);

 	tuner_info("ADC Level = %d\n",
 		   (buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);

 	tuner_info("Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));

 	tuner_info("Reserved = 0x%02x\n",
 		   (buffer[4] & TEA5767_RESERVED_MASK));
 }

 /* Freq should be specifyed at 62.5 Hz */
 static int set_radio_freq(struct dvb_frontend *fe,
 			  struct analog_parameters *params)
 {
 	struct tea5767_priv *priv = fe->tuner_priv;
 	unsigned int frq = params->frequency;
 	unsigned char buffer[5];
 	unsigned div;
 	int rc;

 	tuner_dbg("radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);

 	buffer[2] = 0;

 	if (priv->ctrl.port1)
 		buffer[2] |= TEA5767_PORT1_HIGH;

 	if (params->audmode == V4L2_TUNER_MODE_MONO) {
 		tuner_dbg("TEA5767 set to mono\n");
 		buffer[2] |= TEA5767_MONO;
 	} else {
 		tuner_dbg("TEA5767 set to stereo\n");
 	}


 	buffer[3] = 0;

 	if (priv->ctrl.port2)
 		buffer[3] |= TEA5767_PORT2_HIGH;

 	if (priv->ctrl.high_cut)
 		buffer[3] |= TEA5767_HIGH_CUT_CTRL;

 	if (priv->ctrl.st_noise)
 		buffer[3] |= TEA5767_ST_NOISE_CTL;

 	if (priv->ctrl.soft_mute)
 		buffer[3] |= TEA5767_SOFT_MUTE;

 	if (priv->ctrl.japan_band)
 		buffer[3] |= TEA5767_JAPAN_BAND;

 	buffer[4] = 0;

 	if (priv->ctrl.deemph_75)
 		buffer[4] |= TEA5767_DEEMPH_75;

 	if (priv->ctrl.pllref)
 		buffer[4] |= TEA5767_PLLREF_ENABLE;


 	/* Rounds freq to next decimal value - for 62.5 KHz step */
 	/* frq = 20*(frq/16)+radio_frq[frq%16]; */

 	switch (priv->ctrl.xtal_freq) {
 	case TEA5767_HIGH_LO_13MHz:
 		tuner_dbg("radio HIGH LO inject xtal @ 13 MHz\n");
 		buffer[2] |= TEA5767_HIGH_LO_INJECT;
 		div = (frq * (4000 / 16) + 700000 + 225000 + 25000) / 50000;
 		break;
 	case TEA5767_LOW_LO_13MHz:
 		tuner_dbg("radio LOW LO inject xtal @ 13 MHz\n");

 		div = (frq * (4000 / 16) - 700000 - 225000 + 25000) / 50000;
 		break;
 	case TEA5767_LOW_LO_32768:
 		tuner_dbg("radio LOW LO inject xtal @ 32,768 MHz\n");
 		buffer[3] |= TEA5767_XTAL_32768;
 		/* const 700=4000*175 Khz - to adjust freq to right value */
 		div = ((frq * (4000 / 16) - 700000 - 225000) + 16384) >> 15;
 		break;
 	case TEA5767_HIGH_LO_32768:
 	default:
 		tuner_dbg("radio HIGH LO inject xtal @ 32,768 MHz\n");

 		buffer[2] |= TEA5767_HIGH_LO_INJECT;
 		buffer[3] |= TEA5767_XTAL_32768;
 		div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
 		break;
 	}
 	buffer[0] = (div >> 8) & 0x3f;
 	buffer[1] = div & 0xff;

 	if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
 		tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);

 	if (debug) {
 		if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5)))
 			tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 		else
 			tea5767_status_dump(priv, buffer);
 	}

 	priv->frequency = frq * 125 / 2;

 	return 0;
 }

 static int tea5767_read_status(struct dvb_frontend *fe, char *buffer)
 {
 	struct tea5767_priv *priv = fe->tuner_priv;
 	int rc;

 	memset(buffer, 0, 5);
 	if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5))) {
 		tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 		return -EREMOTEIO;
 	}

 	return 0;
 }

 static inline int tea5767_signal(struct dvb_frontend *fe, const char *buffer)
 {
 	struct tea5767_priv *priv = fe->tuner_priv;

 	int signal = ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);

 	tuner_dbg("Signal strength: %d\n", signal);

 	return signal;
 }

 static inline int tea5767_stereo(struct dvb_frontend *fe, const char *buffer)
 {
 	struct tea5767_priv *priv = fe->tuner_priv;

 	int stereo = buffer[2] & TEA5767_STEREO_MASK;

 	tuner_dbg("Radio ST GET = %02x\n", stereo);

 	return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 }

 static int tea5767_get_status(struct dvb_frontend *fe, u32 *status)
 {
 	unsigned char buffer[5];

 	*status = 0;

 	if (0 == tea5767_read_status(fe, buffer)) {
 		if (tea5767_signal(fe, buffer))
 			*status = TUNER_STATUS_LOCKED;
 		if (tea5767_stereo(fe, buffer))
 			*status |= TUNER_STATUS_STEREO;
 	}

 	return 0;
 }

 static int tea5767_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 {
 	unsigned char buffer[5];

 	*strength = 0;

 	if (0 == tea5767_read_status(fe, buffer))
 		*strength = tea5767_signal(fe, buffer);

 	return 0;
 }

 static int tea5767_standby(struct dvb_frontend *fe)
 {
 	unsigned char buffer[5];
 	struct tea5767_priv *priv = fe->tuner_priv;
 	unsigned div, rc;

 	div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */
 	buffer[0] = (div >> 8) & 0x3f;
 	buffer[1] = div & 0xff;
 	buffer[2] = TEA5767_PORT1_HIGH;
 	buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |
 		    TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND | TEA5767_STDBY;
 	buffer[4] = 0;

 	if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
 		tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);

 	return 0;
 }

 int tea5767_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 {
 	struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 	unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 	int rc;

 	if ((rc = tuner_i2c_xfer_recv(&i2c, buffer, 7))< 5) {
 		printk(KERN_WARNING "It is not a TEA5767. Received %i bytes.\n", rc);
 		return -EINVAL;
 	}

 	/* If all bytes are the same then it's a TV tuner and not a tea5767 */
 	if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
 	    buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
 		printk(KERN_WARNING "All bytes are equal. It is not a TEA5767\n");
 		return -EINVAL;
 	}

 	/*  Status bytes:
 	 *  Byte 4: bit 3:1 : CI (Chip Identification) == 0
 	 *          bit 0   : internally set to 0
 	 *  Byte 5: bit 7:0 : == 0
 	 */
 	if (((buffer[3] & 0x0f) != 0x00) || (buffer[4] != 0x00)) {
 		printk(KERN_WARNING "Chip ID is not zero. It is not a TEA5767\n");
 		return -EINVAL;
 	}


 	return 0;
 }

 static int tea5767_release(struct dvb_frontend *fe)
 {
 	kfree(fe->tuner_priv);
 	fe->tuner_priv = NULL;

 	return 0;
 }

 static int tea5767_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct tea5767_priv *priv = fe->tuner_priv;
 	*frequency = priv->frequency;

 	return 0;
 }

 static int tea5767_set_config (struct dvb_frontend *fe, void *priv_cfg)
 {
 	struct tea5767_priv *priv = fe->tuner_priv;

 	memcpy(&priv->ctrl, priv_cfg, sizeof(priv->ctrl));

 	return 0;
 }

 static struct dvb_tuner_ops tea5767_tuner_ops = {
 	.info = {
 		.name           = "tea5767", // Philips TEA5767HN FM Radio
 	},

 	.set_analog_params = set_radio_freq,
 	.set_config	   = tea5767_set_config,
 	.sleep             = tea5767_standby,
 	.release           = tea5767_release,
 	.get_frequency     = tea5767_get_frequency,
 	.get_status        = tea5767_get_status,
 	.get_rf_strength   = tea5767_get_rf_strength,
 };

 struct dvb_frontend *tea5767_attach(struct dvb_frontend *fe,
 				    struct i2c_adapter* i2c_adap,
 				    u8 i2c_addr)
 {
 	struct tea5767_priv *priv = NULL;

 	priv = kzalloc(sizeof(struct tea5767_priv), GFP_KERNEL);
 	if (priv == NULL)
 		return NULL;
 	fe->tuner_priv = priv;

 	priv->i2c_props.addr  = i2c_addr;
 	priv->i2c_props.adap  = i2c_adap;
 	priv->i2c_props.name  = "tea5767";

 	priv->ctrl.xtal_freq  = TEA5767_HIGH_LO_32768;
 	priv->ctrl.port1      = 1;
 	priv->ctrl.port2      = 1;
 	priv->ctrl.high_cut   = 1;
 	priv->ctrl.st_noise   = 1;
 	priv->ctrl.japan_band = 1;

 	memcpy(&fe->ops.tuner_ops, &tea5767_tuner_ops,
 	       sizeof(struct dvb_tuner_ops));

 	tuner_info("type set to %s\n", "Philips TEA5767HN FM Radio");

 	return fe;
 }

 EXPORT_SYMBOL_GPL(tea5767_attach);
 EXPORT_SYMBOL_GPL(tea5767_autodetection);

 MODULE_DESCRIPTION("Philips TEA5767 FM tuner driver");
 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 MODULE_LICENSE("GPL");
	/*
	* For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
	* I2C address is allways 0xC0.
	*
	*
	* Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@infradead.org)
	* This code is placed under the terms of the GNU General Public License
	*
	* tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
	* from their contributions on DScaler.
	*/

	#include <linux/i2c.h>
	#include <linux/delay.h>
	#include <linux/videodev2.h>
	#include "tuner-i2c.h"
	#include "tea5767.h"

	static int debug;
	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "enable verbose debug messages");

	/*****************************************************************************/

	struct tea5767_priv {
	struct tuner_i2c_props i2c_props;
	u32 frequency;
	struct tea5767_ctrl ctrl;
	};

	/*****************************************************************************/

	/******************************
	* Write mode register values *
	******************************/

	/* First register */
	#define TEA5767_MUTE 0x80 /* Mutes output */
	#define TEA5767_SEARCH 0x40 /* Activates station search */
	/* Bits 0-5 for divider MSB */

	/* Second register */
	/* Bits 0-7 for divider LSB */

	/* Third register */

	/* Station search from botton to up */
	#define TEA5767_SEARCH_UP 0x80

	/* Searches with ADC output = 10 */
	#define TEA5767_SRCH_HIGH_LVL 0x60

	/* Searches with ADC output = 10 */
	#define TEA5767_SRCH_MID_LVL 0x40

	/* Searches with ADC output = 5 */
	#define TEA5767_SRCH_LOW_LVL 0x20

	/* if on, div=4(Frf+Fif)/Fref otherwise, div=4(Frf-Fif)/Freq) */
	#define TEA5767_HIGH_LO_INJECT 0x10

	/* Disable stereo */
	#define TEA5767_MONO 0x08

	/* Disable right channel and turns to mono */
	#define TEA5767_MUTE_RIGHT 0x04

	/* Disable left channel and turns to mono */
	#define TEA5767_MUTE_LEFT 0x02

	#define TEA5767_PORT1_HIGH 0x01

	/* Fourth register */
	#define TEA5767_PORT2_HIGH 0x80
	/* Chips stops working. Only I2C bus remains on */
	#define TEA5767_STDBY 0x40

	/* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
	#define TEA5767_JAPAN_BAND 0x20

	/* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
	#define TEA5767_XTAL_32768 0x10

	/* Cuts weak signals */
	#define TEA5767_SOFT_MUTE 0x08

	/* Activates high cut control */
	#define TEA5767_HIGH_CUT_CTRL 0x04

	/* Activates stereo noise control */
	#define TEA5767_ST_NOISE_CTL 0x02

	/* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
	#define TEA5767_SRCH_IND 0x01

	/* Fifth register */

	/* By activating, it will use Xtal at 13 MHz as reference for divider */
	#define TEA5767_PLLREF_ENABLE 0x80

	/* By activating, deemphasis=50, or else, deemphasis of 50us */
	#define TEA5767_DEEMPH_75 0X40

	/*****************************
	* Read mode register values *
	*****************************/

	/* First register */
	#define TEA5767_READY_FLAG_MASK 0x80
	#define TEA5767_BAND_LIMIT_MASK 0X40
	/* Bits 0-5 for divider MSB after search or preset */

	/* Second register */
	/* Bits 0-7 for divider LSB after search or preset */

	/* Third register */
	#define TEA5767_STEREO_MASK 0x80
	#define TEA5767_IF_CNTR_MASK 0x7f

	/* Fourth register */
	#define TEA5767_ADC_LEVEL_MASK 0xf0

	/* should be 0 */
	#define TEA5767_CHIP_ID_MASK 0x0f

	/* Fifth register */
	/* Reserved for future extensions */
	#define TEA5767_RESERVED_MASK 0xff

	/*****************************************************************************/

	static void tea5767_status_dump(struct tea5767_priv *priv,
	unsigned char *buffer)
	{
	unsigned int div, frq;

	if (TEA5767_READY_FLAG_MASK & buffer[0])
	tuner_info("Ready Flag ON\n");
	else
	tuner_info("Ready Flag OFF\n");

	if (TEA5767_BAND_LIMIT_MASK & buffer[0])
	tuner_info("Tuner at band limit\n");
	else
	tuner_info("Tuner not at band limit\n");

	div = ((buffer[0] & 0x3f) << 8) \| buffer[1];

	switch (priv->ctrl.xtal_freq) {
	case TEA5767_HIGH_LO_13MHz:
	frq = (div * 50000 - 700000 - 225000) / 4; /* Freq in KHz */
	break;
	case TEA5767_LOW_LO_13MHz:
	frq = (div * 50000 + 700000 + 225000) / 4; /* Freq in KHz */
	break;
	case TEA5767_LOW_LO_32768:
	frq = (div * 32768 + 700000 + 225000) / 4; /* Freq in KHz */
	break;
	case TEA5767_HIGH_LO_32768:
	default:
	frq = (div * 32768 - 700000 - 225000) / 4; /* Freq in KHz */
	break;
	}
	buffer[0] = (div >> 8) & 0x3f;
	buffer[1] = div & 0xff;

	tuner_info("Frequency %d.%03d KHz (divider = 0x%04x)\n",
	frq / 1000, frq % 1000, div);

	if (TEA5767_STEREO_MASK & buffer[2])
	tuner_info("Stereo\n");
	else
	tuner_info("Mono\n");

	tuner_info("IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);

	tuner_info("ADC Level = %d\n",
	(buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);

	tuner_info("Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));

	tuner_info("Reserved = 0x%02x\n",
	(buffer[4] & TEA5767_RESERVED_MASK));
	}

	/* Freq should be specifyed at 62.5 Hz */
	static int set_radio_freq(struct dvb_frontend *fe,
	struct analog_parameters *params)
	{
	struct tea5767_priv *priv = fe->tuner_priv;
	unsigned int frq = params->frequency;
	unsigned char buffer[5];
	unsigned div;
	int rc;

	tuner_dbg("radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);

	buffer[2] = 0;

	if (priv->ctrl.port1)
	buffer[2] \|= TEA5767_PORT1_HIGH;

	if (params->audmode == V4L2_TUNER_MODE_MONO) {
	tuner_dbg("TEA5767 set to mono\n");
	buffer[2] \|= TEA5767_MONO;
	} else {
	tuner_dbg("TEA5767 set to stereo\n");
	}


	buffer[3] = 0;

	if (priv->ctrl.port2)
	buffer[3] \|= TEA5767_PORT2_HIGH;

	if (priv->ctrl.high_cut)
	buffer[3] \|= TEA5767_HIGH_CUT_CTRL;

	if (priv->ctrl.st_noise)
	buffer[3] \|= TEA5767_ST_NOISE_CTL;

	if (priv->ctrl.soft_mute)
	buffer[3] \|= TEA5767_SOFT_MUTE;

	if (priv->ctrl.japan_band)
	buffer[3] \|= TEA5767_JAPAN_BAND;

	buffer[4] = 0;

	if (priv->ctrl.deemph_75)
	buffer[4] \|= TEA5767_DEEMPH_75;

	if (priv->ctrl.pllref)
	buffer[4] \|= TEA5767_PLLREF_ENABLE;


	/* Rounds freq to next decimal value - for 62.5 KHz step */
	/* frq = 20(frq/16)+radio_frq[frq%16]; /

	switch (priv->ctrl.xtal_freq) {
	case TEA5767_HIGH_LO_13MHz:
	tuner_dbg("radio HIGH LO inject xtal @ 13 MHz\n");
	buffer[2] \|= TEA5767_HIGH_LO_INJECT;
	div = (frq * (4000 / 16) + 700000 + 225000 + 25000) / 50000;
	break;
	case TEA5767_LOW_LO_13MHz:
	tuner_dbg("radio LOW LO inject xtal @ 13 MHz\n");

	div = (frq * (4000 / 16) - 700000 - 225000 + 25000) / 50000;
	break;
	case TEA5767_LOW_LO_32768:
	tuner_dbg("radio LOW LO inject xtal @ 32,768 MHz\n");
	buffer[3] \|= TEA5767_XTAL_32768;
	/* const 700=4000175 Khz - to adjust freq to right value /
	div = ((frq * (4000 / 16) - 700000 - 225000) + 16384) >> 15;
	break;
	case TEA5767_HIGH_LO_32768:
	default:
	tuner_dbg("radio HIGH LO inject xtal @ 32,768 MHz\n");

	buffer[2] \|= TEA5767_HIGH_LO_INJECT;
	buffer[3] \|= TEA5767_XTAL_32768;
	div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
	break;
	}
	buffer[0] = (div >> 8) & 0x3f;
	buffer[1] = div & 0xff;

	if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
	tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);

	if (debug) {
	if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5)))
	tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
	else
	tea5767_status_dump(priv, buffer);
	}

	priv->frequency = frq * 125 / 2;

	return 0;
	}

	static int tea5767_read_status(struct dvb_frontend fe, char buffer)
	{
	struct tea5767_priv *priv = fe->tuner_priv;
	int rc;

	memset(buffer, 0, 5);
	if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5))) {
	tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
	return -EREMOTEIO;
	}

	return 0;
	}

	static inline int tea5767_signal(struct dvb_frontend fe, const char buffer)
	{
	struct tea5767_priv *priv = fe->tuner_priv;

	int signal = ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);

	tuner_dbg("Signal strength: %d\n", signal);

	return signal;
	}

	static inline int tea5767_stereo(struct dvb_frontend fe, const char buffer)
	{
	struct tea5767_priv *priv = fe->tuner_priv;

	int stereo = buffer[2] & TEA5767_STEREO_MASK;

	tuner_dbg("Radio ST GET = %02x\n", stereo);

	return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
	}

	static int tea5767_get_status(struct dvb_frontend fe, u32 status)
	{
	unsigned char buffer[5];

	*status = 0;

	if (0 == tea5767_read_status(fe, buffer)) {
	if (tea5767_signal(fe, buffer))
	*status = TUNER_STATUS_LOCKED;
	if (tea5767_stereo(fe, buffer))
	*status \|= TUNER_STATUS_STEREO;
	}

	return 0;
	}

	static int tea5767_get_rf_strength(struct dvb_frontend fe, u16 strength)
	{
	unsigned char buffer[5];

	*strength = 0;

	if (0 == tea5767_read_status(fe, buffer))
	*strength = tea5767_signal(fe, buffer);

	return 0;
	}

	static int tea5767_standby(struct dvb_frontend *fe)
	{
	unsigned char buffer[5];
	struct tea5767_priv *priv = fe->tuner_priv;
	unsigned div, rc;

	div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */
	buffer[0] = (div >> 8) & 0x3f;
	buffer[1] = div & 0xff;
	buffer[2] = TEA5767_PORT1_HIGH;
	buffer[3] = TEA5767_PORT2_HIGH \| TEA5767_HIGH_CUT_CTRL \|
	TEA5767_ST_NOISE_CTL \| TEA5767_JAPAN_BAND \| TEA5767_STDBY;
	buffer[4] = 0;

	if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
	tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);

	return 0;
	}

	int tea5767_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
	{
	struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
	unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
	int rc;

	if ((rc = tuner_i2c_xfer_recv(&i2c, buffer, 7))< 5) {
	printk(KERN_WARNING "It is not a TEA5767. Received %i bytes.\n", rc);
	return -EINVAL;
	}

	/* If all bytes are the same then it's a TV tuner and not a tea5767 */
	if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
	buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
	printk(KERN_WARNING "All bytes are equal. It is not a TEA5767\n");
	return -EINVAL;
	}

	/* Status bytes:
	* Byte 4: bit 3:1 : CI (Chip Identification) == 0
	* bit 0 : internally set to 0
	* Byte 5: bit 7:0 : == 0
	*/
	if (((buffer[3] & 0x0f) != 0x00) \|\| (buffer[4] != 0x00)) {
	printk(KERN_WARNING "Chip ID is not zero. It is not a TEA5767\n");
	return -EINVAL;
	}


	return 0;
	}

	static int tea5767_release(struct dvb_frontend *fe)
	{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;

	return 0;
	}

	static int tea5767_get_frequency(struct dvb_frontend fe, u32 frequency)
	{
	struct tea5767_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;

	return 0;
	}

	static int tea5767_set_config (struct dvb_frontend fe, void priv_cfg)
	{
	struct tea5767_priv *priv = fe->tuner_priv;

	memcpy(&priv->ctrl, priv_cfg, sizeof(priv->ctrl));

	return 0;
	}

	static struct dvb_tuner_ops tea5767_tuner_ops = {
	.info = {
	.name = "tea5767", // Philips TEA5767HN FM Radio
	},

	.set_analog_params = set_radio_freq,
	.set_config = tea5767_set_config,
	.sleep = tea5767_standby,
	.release = tea5767_release,
	.get_frequency = tea5767_get_frequency,
	.get_status = tea5767_get_status,
	.get_rf_strength = tea5767_get_rf_strength,
	};

	struct dvb_frontend tea5767_attach(struct dvb_frontend fe,
	struct i2c_adapter* i2c_adap,
	u8 i2c_addr)
	{
	struct tea5767_priv *priv = NULL;

	priv = kzalloc(sizeof(struct tea5767_priv), GFP_KERNEL);
	if (priv == NULL)
	return NULL;
	fe->tuner_priv = priv;

	priv->i2c_props.addr = i2c_addr;
	priv->i2c_props.adap = i2c_adap;
	priv->i2c_props.name = "tea5767";

	priv->ctrl.xtal_freq = TEA5767_HIGH_LO_32768;
	priv->ctrl.port1 = 1;
	priv->ctrl.port2 = 1;
	priv->ctrl.high_cut = 1;
	priv->ctrl.st_noise = 1;
	priv->ctrl.japan_band = 1;

	memcpy(&fe->ops.tuner_ops, &tea5767_tuner_ops,
	sizeof(struct dvb_tuner_ops));

	tuner_info("type set to %s\n", "Philips TEA5767HN FM Radio");

	return fe;
	}

	EXPORT_SYMBOL_GPL(tea5767_attach);
	EXPORT_SYMBOL_GPL(tea5767_autodetection);

	MODULE_DESCRIPTION("Philips TEA5767 FM tuner driver");
	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
	MODULE_LICENSE("GPL");