475 lines
12 KiB
C
475 lines
12 KiB
C
/*
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* For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
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* I2C address is allways 0xC0.
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*
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*
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* Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@infradead.org)
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* This code is placed under the terms of the GNU General Public License
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*
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* tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
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* from their contributions on DScaler.
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*/
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/videodev2.h>
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#include "tuner-i2c.h"
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#include "tea5767.h"
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "enable verbose debug messages");
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/*****************************************************************************/
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struct tea5767_priv {
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struct tuner_i2c_props i2c_props;
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u32 frequency;
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struct tea5767_ctrl ctrl;
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};
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/*****************************************************************************/
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/******************************
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* Write mode register values *
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******************************/
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/* First register */
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#define TEA5767_MUTE 0x80 /* Mutes output */
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#define TEA5767_SEARCH 0x40 /* Activates station search */
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/* Bits 0-5 for divider MSB */
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/* Second register */
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/* Bits 0-7 for divider LSB */
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/* Third register */
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/* Station search from botton to up */
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#define TEA5767_SEARCH_UP 0x80
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/* Searches with ADC output = 10 */
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#define TEA5767_SRCH_HIGH_LVL 0x60
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/* Searches with ADC output = 10 */
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#define TEA5767_SRCH_MID_LVL 0x40
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/* Searches with ADC output = 5 */
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#define TEA5767_SRCH_LOW_LVL 0x20
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/* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
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#define TEA5767_HIGH_LO_INJECT 0x10
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/* Disable stereo */
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#define TEA5767_MONO 0x08
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/* Disable right channel and turns to mono */
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#define TEA5767_MUTE_RIGHT 0x04
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/* Disable left channel and turns to mono */
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#define TEA5767_MUTE_LEFT 0x02
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#define TEA5767_PORT1_HIGH 0x01
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/* Fourth register */
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#define TEA5767_PORT2_HIGH 0x80
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/* Chips stops working. Only I2C bus remains on */
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#define TEA5767_STDBY 0x40
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/* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
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#define TEA5767_JAPAN_BAND 0x20
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/* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
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#define TEA5767_XTAL_32768 0x10
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/* Cuts weak signals */
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#define TEA5767_SOFT_MUTE 0x08
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/* Activates high cut control */
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#define TEA5767_HIGH_CUT_CTRL 0x04
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/* Activates stereo noise control */
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#define TEA5767_ST_NOISE_CTL 0x02
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/* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
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#define TEA5767_SRCH_IND 0x01
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/* Fifth register */
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/* By activating, it will use Xtal at 13 MHz as reference for divider */
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#define TEA5767_PLLREF_ENABLE 0x80
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/* By activating, deemphasis=50, or else, deemphasis of 50us */
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#define TEA5767_DEEMPH_75 0X40
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/*****************************
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* Read mode register values *
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*****************************/
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/* First register */
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#define TEA5767_READY_FLAG_MASK 0x80
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#define TEA5767_BAND_LIMIT_MASK 0X40
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/* Bits 0-5 for divider MSB after search or preset */
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/* Second register */
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/* Bits 0-7 for divider LSB after search or preset */
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/* Third register */
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#define TEA5767_STEREO_MASK 0x80
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#define TEA5767_IF_CNTR_MASK 0x7f
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/* Fourth register */
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#define TEA5767_ADC_LEVEL_MASK 0xf0
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/* should be 0 */
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#define TEA5767_CHIP_ID_MASK 0x0f
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/* Fifth register */
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/* Reserved for future extensions */
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#define TEA5767_RESERVED_MASK 0xff
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/*****************************************************************************/
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static void tea5767_status_dump(struct tea5767_priv *priv,
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unsigned char *buffer)
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{
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unsigned int div, frq;
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if (TEA5767_READY_FLAG_MASK & buffer[0])
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tuner_info("Ready Flag ON\n");
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else
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tuner_info("Ready Flag OFF\n");
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if (TEA5767_BAND_LIMIT_MASK & buffer[0])
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tuner_info("Tuner at band limit\n");
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else
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tuner_info("Tuner not at band limit\n");
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div = ((buffer[0] & 0x3f) << 8) | buffer[1];
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switch (priv->ctrl.xtal_freq) {
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case TEA5767_HIGH_LO_13MHz:
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frq = (div * 50000 - 700000 - 225000) / 4; /* Freq in KHz */
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break;
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case TEA5767_LOW_LO_13MHz:
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frq = (div * 50000 + 700000 + 225000) / 4; /* Freq in KHz */
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break;
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case TEA5767_LOW_LO_32768:
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frq = (div * 32768 + 700000 + 225000) / 4; /* Freq in KHz */
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break;
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case TEA5767_HIGH_LO_32768:
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default:
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frq = (div * 32768 - 700000 - 225000) / 4; /* Freq in KHz */
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break;
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}
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buffer[0] = (div >> 8) & 0x3f;
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buffer[1] = div & 0xff;
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tuner_info("Frequency %d.%03d KHz (divider = 0x%04x)\n",
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frq / 1000, frq % 1000, div);
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if (TEA5767_STEREO_MASK & buffer[2])
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tuner_info("Stereo\n");
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else
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tuner_info("Mono\n");
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tuner_info("IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);
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tuner_info("ADC Level = %d\n",
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(buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);
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tuner_info("Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));
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tuner_info("Reserved = 0x%02x\n",
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(buffer[4] & TEA5767_RESERVED_MASK));
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}
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/* Freq should be specifyed at 62.5 Hz */
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static int set_radio_freq(struct dvb_frontend *fe,
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struct analog_parameters *params)
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{
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struct tea5767_priv *priv = fe->tuner_priv;
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unsigned int frq = params->frequency;
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unsigned char buffer[5];
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unsigned div;
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int rc;
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tuner_dbg("radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);
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buffer[2] = 0;
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if (priv->ctrl.port1)
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buffer[2] |= TEA5767_PORT1_HIGH;
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if (params->audmode == V4L2_TUNER_MODE_MONO) {
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tuner_dbg("TEA5767 set to mono\n");
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buffer[2] |= TEA5767_MONO;
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} else {
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tuner_dbg("TEA5767 set to stereo\n");
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}
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buffer[3] = 0;
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if (priv->ctrl.port2)
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buffer[3] |= TEA5767_PORT2_HIGH;
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if (priv->ctrl.high_cut)
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buffer[3] |= TEA5767_HIGH_CUT_CTRL;
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if (priv->ctrl.st_noise)
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buffer[3] |= TEA5767_ST_NOISE_CTL;
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if (priv->ctrl.soft_mute)
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buffer[3] |= TEA5767_SOFT_MUTE;
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if (priv->ctrl.japan_band)
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buffer[3] |= TEA5767_JAPAN_BAND;
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buffer[4] = 0;
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if (priv->ctrl.deemph_75)
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buffer[4] |= TEA5767_DEEMPH_75;
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if (priv->ctrl.pllref)
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buffer[4] |= TEA5767_PLLREF_ENABLE;
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/* Rounds freq to next decimal value - for 62.5 KHz step */
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/* frq = 20*(frq/16)+radio_frq[frq%16]; */
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switch (priv->ctrl.xtal_freq) {
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case TEA5767_HIGH_LO_13MHz:
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tuner_dbg("radio HIGH LO inject xtal @ 13 MHz\n");
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buffer[2] |= TEA5767_HIGH_LO_INJECT;
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div = (frq * (4000 / 16) + 700000 + 225000 + 25000) / 50000;
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break;
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case TEA5767_LOW_LO_13MHz:
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tuner_dbg("radio LOW LO inject xtal @ 13 MHz\n");
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div = (frq * (4000 / 16) - 700000 - 225000 + 25000) / 50000;
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break;
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case TEA5767_LOW_LO_32768:
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tuner_dbg("radio LOW LO inject xtal @ 32,768 MHz\n");
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buffer[3] |= TEA5767_XTAL_32768;
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/* const 700=4000*175 Khz - to adjust freq to right value */
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div = ((frq * (4000 / 16) - 700000 - 225000) + 16384) >> 15;
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break;
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case TEA5767_HIGH_LO_32768:
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default:
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tuner_dbg("radio HIGH LO inject xtal @ 32,768 MHz\n");
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buffer[2] |= TEA5767_HIGH_LO_INJECT;
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buffer[3] |= TEA5767_XTAL_32768;
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div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
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break;
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}
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buffer[0] = (div >> 8) & 0x3f;
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buffer[1] = div & 0xff;
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if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
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tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
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if (debug) {
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if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5)))
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tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
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else
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tea5767_status_dump(priv, buffer);
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}
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priv->frequency = frq * 125 / 2;
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return 0;
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}
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static int tea5767_read_status(struct dvb_frontend *fe, char *buffer)
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{
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struct tea5767_priv *priv = fe->tuner_priv;
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int rc;
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memset(buffer, 0, 5);
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if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5))) {
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tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
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return -EREMOTEIO;
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}
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return 0;
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}
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static inline int tea5767_signal(struct dvb_frontend *fe, const char *buffer)
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{
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struct tea5767_priv *priv = fe->tuner_priv;
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int signal = ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);
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tuner_dbg("Signal strength: %d\n", signal);
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return signal;
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}
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static inline int tea5767_stereo(struct dvb_frontend *fe, const char *buffer)
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{
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struct tea5767_priv *priv = fe->tuner_priv;
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int stereo = buffer[2] & TEA5767_STEREO_MASK;
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tuner_dbg("Radio ST GET = %02x\n", stereo);
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return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
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}
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static int tea5767_get_status(struct dvb_frontend *fe, u32 *status)
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{
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unsigned char buffer[5];
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*status = 0;
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if (0 == tea5767_read_status(fe, buffer)) {
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if (tea5767_signal(fe, buffer))
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*status = TUNER_STATUS_LOCKED;
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if (tea5767_stereo(fe, buffer))
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*status |= TUNER_STATUS_STEREO;
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}
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return 0;
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}
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static int tea5767_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
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{
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unsigned char buffer[5];
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*strength = 0;
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if (0 == tea5767_read_status(fe, buffer))
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*strength = tea5767_signal(fe, buffer);
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return 0;
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}
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static int tea5767_standby(struct dvb_frontend *fe)
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{
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unsigned char buffer[5];
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struct tea5767_priv *priv = fe->tuner_priv;
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unsigned div, rc;
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div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */
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buffer[0] = (div >> 8) & 0x3f;
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buffer[1] = div & 0xff;
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buffer[2] = TEA5767_PORT1_HIGH;
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buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |
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TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND | TEA5767_STDBY;
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buffer[4] = 0;
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if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
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tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
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return 0;
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}
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int tea5767_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
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{
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struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
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unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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int rc;
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if ((rc = tuner_i2c_xfer_recv(&i2c, buffer, 7))< 5) {
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printk(KERN_WARNING "It is not a TEA5767. Received %i bytes.\n", rc);
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return -EINVAL;
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}
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/* If all bytes are the same then it's a TV tuner and not a tea5767 */
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if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
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buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
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printk(KERN_WARNING "All bytes are equal. It is not a TEA5767\n");
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return -EINVAL;
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}
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/* Status bytes:
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* Byte 4: bit 3:1 : CI (Chip Identification) == 0
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* bit 0 : internally set to 0
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* Byte 5: bit 7:0 : == 0
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*/
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if (((buffer[3] & 0x0f) != 0x00) || (buffer[4] != 0x00)) {
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printk(KERN_WARNING "Chip ID is not zero. It is not a TEA5767\n");
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return -EINVAL;
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}
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return 0;
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}
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static int tea5767_release(struct dvb_frontend *fe)
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{
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kfree(fe->tuner_priv);
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fe->tuner_priv = NULL;
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return 0;
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}
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static int tea5767_get_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct tea5767_priv *priv = fe->tuner_priv;
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*frequency = priv->frequency;
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return 0;
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}
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static int tea5767_set_config (struct dvb_frontend *fe, void *priv_cfg)
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{
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struct tea5767_priv *priv = fe->tuner_priv;
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memcpy(&priv->ctrl, priv_cfg, sizeof(priv->ctrl));
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return 0;
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}
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static struct dvb_tuner_ops tea5767_tuner_ops = {
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.info = {
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.name = "tea5767", // Philips TEA5767HN FM Radio
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},
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.set_analog_params = set_radio_freq,
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.set_config = tea5767_set_config,
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.sleep = tea5767_standby,
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.release = tea5767_release,
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.get_frequency = tea5767_get_frequency,
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.get_status = tea5767_get_status,
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.get_rf_strength = tea5767_get_rf_strength,
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};
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struct dvb_frontend *tea5767_attach(struct dvb_frontend *fe,
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struct i2c_adapter* i2c_adap,
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u8 i2c_addr)
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{
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struct tea5767_priv *priv = NULL;
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priv = kzalloc(sizeof(struct tea5767_priv), GFP_KERNEL);
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if (priv == NULL)
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return NULL;
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fe->tuner_priv = priv;
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priv->i2c_props.addr = i2c_addr;
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priv->i2c_props.adap = i2c_adap;
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priv->i2c_props.name = "tea5767";
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priv->ctrl.xtal_freq = TEA5767_HIGH_LO_32768;
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priv->ctrl.port1 = 1;
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priv->ctrl.port2 = 1;
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priv->ctrl.high_cut = 1;
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priv->ctrl.st_noise = 1;
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priv->ctrl.japan_band = 1;
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memcpy(&fe->ops.tuner_ops, &tea5767_tuner_ops,
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sizeof(struct dvb_tuner_ops));
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tuner_info("type set to %s\n", "Philips TEA5767HN FM Radio");
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return fe;
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}
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EXPORT_SYMBOL_GPL(tea5767_attach);
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EXPORT_SYMBOL_GPL(tea5767_autodetection);
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MODULE_DESCRIPTION("Philips TEA5767 FM tuner driver");
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
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MODULE_LICENSE("GPL");
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