tuner-simple.c

linux 内核源代码

/*
 * i2c tv tuner chip device driver
 * controls all those simple 4-control-bytes style tuners.
 *
 * This "tuner-simple" module was split apart from the original "tuner" module.
 */
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/videodev.h>
#include <media/tuner.h>
#include <media/v4l2-common.h>
#include <media/tuner-types.h>
#include "tuner-i2c.h"
#include "tuner-simple.h"

static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages");

#define PREFIX "tuner-simple "

static int offset = 0;
module_param(offset, int, 0664);
MODULE_PARM_DESC(offset,"Allows to specify an offset for tuner");

/* ---------------------------------------------------------------------- */

/* tv standard selection for Temic 4046 FM5
   this value takes the low bits of control byte 2
   from datasheet Rev.01, Feb.00
     standard     BG      I       L       L2      D
     picture IF   38.9    38.9    38.9    33.95   38.9
     sound 1      33.4    32.9    32.4    40.45   32.4
     sound 2      33.16
     NICAM        33.05   32.348  33.05           33.05
 */
#define TEMIC_SET_PAL_I         0x05
#define TEMIC_SET_PAL_DK        0x09
#define TEMIC_SET_PAL_L         0x0a // SECAM ?
#define TEMIC_SET_PAL_L2        0x0b // change IF !
#define TEMIC_SET_PAL_BG        0x0c

/* tv tuner system standard selection for Philips FQ1216ME
   this value takes the low bits of control byte 2
   from datasheet "1999 Nov 16" (supersedes "1999 Mar 23")
     standard 		BG	DK	I	L	L`
     picture carrier	38.90	38.90	38.90	38.90	33.95
     colour		34.47	34.47	34.47	34.47	38.38
     sound 1		33.40	32.40	32.90	32.40	40.45
     sound 2		33.16	-	-	-	-
     NICAM		33.05	33.05	32.35	33.05	39.80
 */
#define PHILIPS_SET_PAL_I	0x01 /* Bit 2 always zero !*/
#define PHILIPS_SET_PAL_BGDK	0x09
#define PHILIPS_SET_PAL_L2	0x0a
#define PHILIPS_SET_PAL_L	0x0b

/* system switching for Philips FI1216MF MK2
   from datasheet "1996 Jul 09",
    standard         BG     L      L'
    picture carrier  38.90  38.90  33.95
    colour	     34.47  34.37  38.38
    sound 1          33.40  32.40  40.45
    sound 2          33.16  -      -
    NICAM            33.05  33.05  39.80
 */
#define PHILIPS_MF_SET_STD_BG	0x01 /* Bit 2 must be zero, Bit 3 is system output */
#define PHILIPS_MF_SET_STD_L	0x03 /* Used on Secam France */
#define PHILIPS_MF_SET_STD_LC	0x02 /* Used on SECAM L' */

/* Control byte */

#define TUNER_RATIO_MASK        0x06 /* Bit cb1:cb2 */
#define TUNER_RATIO_SELECT_50   0x00
#define TUNER_RATIO_SELECT_32   0x02
#define TUNER_RATIO_SELECT_166  0x04
#define TUNER_RATIO_SELECT_62   0x06

#define TUNER_CHARGE_PUMP       0x40  /* Bit cb6 */

/* Status byte */

#define TUNER_POR	  0x80
#define TUNER_FL          0x40
#define TUNER_MODE        0x38
#define TUNER_AFC         0x07
#define TUNER_SIGNAL      0x07
#define TUNER_STEREO      0x10

#define TUNER_PLL_LOCKED   0x40
#define TUNER_STEREO_MK3   0x04

struct tuner_simple_priv {
	u16 last_div;
	struct tuner_i2c_props i2c_props;

	unsigned int type;
	struct tunertype *tun;

	u32 frequency;
};

/* ---------------------------------------------------------------------- */

static int tuner_read_status(struct dvb_frontend *fe)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	unsigned char byte;

	if (1 != tuner_i2c_xfer_recv(&priv->i2c_props,&byte,1))
		return 0;

	return byte;
}

static inline int tuner_signal(const int status)
{
	return (status & TUNER_SIGNAL) << 13;
}

static inline int tuner_stereo(const int type, const int status)
{
	switch (type) {
		case TUNER_PHILIPS_FM1216ME_MK3:
		case TUNER_PHILIPS_FM1236_MK3:
		case TUNER_PHILIPS_FM1256_IH3:
		case TUNER_LG_NTSC_TAPE:
			return ((status & TUNER_SIGNAL) == TUNER_STEREO_MK3);
		default:
			return status & TUNER_STEREO;
	}
}

static inline int tuner_islocked(const int status)
{
	return (status & TUNER_FL);
}

static inline int tuner_afcstatus(const int status)
{
	return (status & TUNER_AFC) - 2;
}


static int simple_get_status(struct dvb_frontend *fe, u32 *status)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	int tuner_status = tuner_read_status(fe);

	*status = 0;

	if (tuner_islocked(tuner_status))
		*status = TUNER_STATUS_LOCKED;
	if (tuner_stereo(priv->type, tuner_status))
		*status |= TUNER_STATUS_STEREO;

	tuner_dbg("AFC Status: %d\n", tuner_afcstatus(tuner_status));

	return 0;
}

static int simple_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	int signal = tuner_signal(tuner_read_status(fe));

	*strength = signal;

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

	return 0;
}

/* ---------------------------------------------------------------------- */

static int simple_set_tv_freq(struct dvb_frontend *fe,
			      struct analog_parameters *params)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	u8 config, cb, tuneraddr;
	u16 div;
	struct tunertype *tun;
	u8 buffer[4];
	int rc, IFPCoff, i, j;
	enum param_type desired_type;
	struct tuner_params *t_params;

	tun = priv->tun;

	/* IFPCoff = Video Intermediate Frequency - Vif:
		940  =16*58.75  NTSC/J (Japan)
		732  =16*45.75  M/N STD
		704  =16*44     ATSC (at DVB code)
		632  =16*39.50  I U.K.
		622.4=16*38.90  B/G D/K I, L STD
		592  =16*37.00  D China
		590  =16.36.875 B Australia
		543.2=16*33.95  L' STD
		171.2=16*10.70  FM Radio (at set_radio_freq)
	*/

	if (params->std == V4L2_STD_NTSC_M_JP) {
		IFPCoff      = 940;
		desired_type = TUNER_PARAM_TYPE_NTSC;
	} else if ((params->std & V4L2_STD_MN) &&
		  !(params->std & ~V4L2_STD_MN)) {
		IFPCoff      = 732;
		desired_type = TUNER_PARAM_TYPE_NTSC;
	} else if (params->std == V4L2_STD_SECAM_LC) {
		IFPCoff      = 543;
		desired_type = TUNER_PARAM_TYPE_SECAM;
	} else {
		IFPCoff      = 623;
		desired_type = TUNER_PARAM_TYPE_PAL;
	}

	for (j = 0; j < tun->count-1; j++) {
		if (desired_type != tun->params[j].type)
			continue;
		break;
	}
	/* use default tuner_t_params if desired_type not available */
	if (desired_type != tun->params[j].type) {
		tuner_dbg("IFPCoff = %d: tuner_t_params undefined for tuner %d\n",
			  IFPCoff, priv->type);
		j = 0;
	}
	t_params = &tun->params[j];

	for (i = 0; i < t_params->count; i++) {
		if (params->frequency > t_params->ranges[i].limit)
			continue;
		break;
	}
	if (i == t_params->count) {
		tuner_dbg("TV frequency out of range (%d > %d)",
				params->frequency, t_params->ranges[i - 1].limit);
		params->frequency = t_params->ranges[--i].limit;
	}
	config = t_params->ranges[i].config;
	cb     = t_params->ranges[i].cb;
	/*  i == 0 -> VHF_LO
	 *  i == 1 -> VHF_HI
	 *  i == 2 -> UHF     */
	tuner_dbg("tv: param %d, range %d\n",j,i);

	div=params->frequency + IFPCoff + offset;

	tuner_dbg("Freq= %d.%02d MHz, V_IF=%d.%02d MHz, Offset=%d.%02d MHz, div=%0d\n",
					params->frequency / 16, params->frequency % 16 * 100 / 16,
					IFPCoff / 16, IFPCoff % 16 * 100 / 16,
					offset / 16, offset % 16 * 100 / 16,
					div);

	/* tv norm specific stuff for multi-norm tuners */
	switch (priv->type) {
	case TUNER_PHILIPS_SECAM: // FI1216MF
		/* 0x01 -> ??? no change ??? */
		/* 0x02 -> PAL BDGHI / SECAM L */
		/* 0x04 -> ??? PAL others / SECAM others ??? */
		cb &= ~0x03;
		if (params->std & V4L2_STD_SECAM_L) //also valid for V4L2_STD_SECAM
			cb |= PHILIPS_MF_SET_STD_L;
		else if (params->std & V4L2_STD_SECAM_LC)
			cb |= PHILIPS_MF_SET_STD_LC;
		else /* V4L2_STD_B|V4L2_STD_GH */
			cb |= PHILIPS_MF_SET_STD_BG;
		break;

	case TUNER_TEMIC_4046FM5:
		cb &= ~0x0f;

		if (params->std & V4L2_STD_PAL_BG) {
			cb |= TEMIC_SET_PAL_BG;

		} else if (params->std & V4L2_STD_PAL_I) {
			cb |= TEMIC_SET_PAL_I;

		} else if (params->std & V4L2_STD_PAL_DK) {
			cb |= TEMIC_SET_PAL_DK;

		} else if (params->std & V4L2_STD_SECAM_L) {
			cb |= TEMIC_SET_PAL_L;

		}
		break;

	case TUNER_PHILIPS_FQ1216ME:
		cb &= ~0x0f;

		if (params->std & (V4L2_STD_PAL_BG|V4L2_STD_PAL_DK)) {
			cb |= PHILIPS_SET_PAL_BGDK;

		} else if (params->std & V4L2_STD_PAL_I) {
			cb |= PHILIPS_SET_PAL_I;

		} else if (params->std & V4L2_STD_SECAM_L) {
			cb |= PHILIPS_SET_PAL_L;

		}
		break;

	case TUNER_PHILIPS_ATSC:
		/* 0x00 -> ATSC antenna input 1 */
		/* 0x01 -> ATSC antenna input 2 */
		/* 0x02 -> NTSC antenna input 1 */
		/* 0x03 -> NTSC antenna input 2 */
		cb &= ~0x03;
		if (!(params->std & V4L2_STD_ATSC))
			cb |= 2;
		/* FIXME: input */
		break;

	case TUNER_MICROTUNE_4042FI5:
		/* Set the charge pump for fast tuning */
		config |= TUNER_CHARGE_PUMP;
		break;

	case TUNER_PHILIPS_TUV1236D:
		/* 0x40 -> ATSC antenna input 1 */
		/* 0x48 -> ATSC antenna input 2 */