342 lines
8.6 KiB
C
342 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// For Philips TEA5761 FM Chip
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// I2C address is always 0x20 (0x10 at 7-bit mode).
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//
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// Copyright (c) 2005-2007 Mauro Carvalho Chehab <mchehab@kernel.org>
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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 <media/tuner.h>
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#include "tuner-i2c.h"
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#include "tea5761.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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struct tea5761_priv {
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struct tuner_i2c_props i2c_props;
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u32 frequency;
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bool standby;
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};
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/*****************************************************************************/
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/***************************
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* TEA5761HN I2C registers *
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***************************/
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/* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
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/* first byte for reading */
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#define TEA5761_INTREG_IFFLAG 0x10
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#define TEA5761_INTREG_LEVFLAG 0x8
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#define TEA5761_INTREG_FRRFLAG 0x2
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#define TEA5761_INTREG_BLFLAG 0x1
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/* second byte for reading / byte for writing */
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#define TEA5761_INTREG_IFMSK 0x10
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#define TEA5761_INTREG_LEVMSK 0x8
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#define TEA5761_INTREG_FRMSK 0x2
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#define TEA5761_INTREG_BLMSK 0x1
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/* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
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/* First byte */
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#define TEA5761_FRQSET_SEARCH_UP 0x80 /* 1=Station search from botton to up */
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#define TEA5761_FRQSET_SEARCH_MODE 0x40 /* 1=Search mode */
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/* Bits 0-5 for divider MSB */
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/* Second byte */
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/* Bits 0-7 for divider LSB */
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/* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
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/* first byte */
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#define TEA5761_TNCTRL_PUPD_0 0x40 /* Power UP/Power Down MSB */
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#define TEA5761_TNCTRL_BLIM 0X20 /* 1= Japan Frequencies, 0= European frequencies */
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#define TEA5761_TNCTRL_SWPM 0x10 /* 1= software port is FRRFLAG */
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#define TEA5761_TNCTRL_IFCTC 0x08 /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
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#define TEA5761_TNCTRL_AFM 0x04
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#define TEA5761_TNCTRL_SMUTE 0x02 /* 1= Soft mute */
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#define TEA5761_TNCTRL_SNC 0x01
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/* second byte */
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#define TEA5761_TNCTRL_MU 0x80 /* 1=Hard mute */
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#define TEA5761_TNCTRL_SSL_1 0x40
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#define TEA5761_TNCTRL_SSL_0 0x20
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#define TEA5761_TNCTRL_HLSI 0x10
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#define TEA5761_TNCTRL_MST 0x08 /* 1 = mono */
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#define TEA5761_TNCTRL_SWP 0x04
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#define TEA5761_TNCTRL_DTC 0x02 /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
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#define TEA5761_TNCTRL_AHLSI 0x01
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/* FRQCHECK - Read: bytes 6 and 7 */
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/* First byte */
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/* Bits 0-5 for divider MSB */
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/* Second byte */
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/* Bits 0-7 for divider LSB */
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/* TUNCHECK - Read: bytes 8 and 9 */
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/* First byte */
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#define TEA5761_TUNCHECK_IF_MASK 0x7e /* IF count */
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#define TEA5761_TUNCHECK_TUNTO 0x01
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/* Second byte */
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#define TEA5761_TUNCHECK_LEV_MASK 0xf0 /* Level Count */
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#define TEA5761_TUNCHECK_LD 0x08
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#define TEA5761_TUNCHECK_STEREO 0x04
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/* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
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/* All zero = no test mode */
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/* MANID - Read: bytes 12 and 13 */
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/* First byte - should be 0x10 */
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#define TEA5767_MANID_VERSION_MASK 0xf0 /* Version = 1 */
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#define TEA5767_MANID_ID_MSB_MASK 0x0f /* Manufacurer ID - should be 0 */
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/* Second byte - Should be 0x2b */
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#define TEA5767_MANID_ID_LSB_MASK 0xfe /* Manufacturer ID - should be 0x15 */
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#define TEA5767_MANID_IDAV 0x01 /* 1 = Chip has ID, 0 = Chip has no ID */
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/* Chip ID - Read: bytes 14 and 15 */
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/* First byte - should be 0x57 */
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/* Second byte - should be 0x61 */
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/*****************************************************************************/
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#define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */
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static void tea5761_status_dump(unsigned char *buffer)
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{
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unsigned int div, frq;
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div = ((buffer[2] & 0x3f) << 8) | buffer[3];
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frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4; /* Freq in KHz */
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printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n",
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frq / 1000, frq % 1000, div);
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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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unsigned int freq,
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bool mono)
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{
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struct tea5761_priv *priv = fe->tuner_priv;
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unsigned int frq = freq;
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unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };
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unsigned div;
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int rc;
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tuner_dbg("radio freq counter %d\n", frq);
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if (priv->standby) {
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tuner_dbg("TEA5761 set to standby mode\n");
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buffer[5] |= TEA5761_TNCTRL_MU;
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} else {
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buffer[4] |= TEA5761_TNCTRL_PUPD_0;
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}
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if (mono) {
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tuner_dbg("TEA5761 set to mono\n");
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buffer[5] |= TEA5761_TNCTRL_MST;
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} else {
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tuner_dbg("TEA5761 set to stereo\n");
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}
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div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15;
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buffer[1] = (div >> 8) & 0x3f;
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buffer[2] = div & 0xff;
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if (debug)
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tea5761_status_dump(buffer);
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if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7)))
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tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
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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 set_radio_freq(struct dvb_frontend *fe,
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struct analog_parameters *params)
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{
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struct tea5761_priv *priv = fe->analog_demod_priv;
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priv->standby = false;
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return __set_radio_freq(fe, params->frequency,
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params->audmode == V4L2_TUNER_MODE_MONO);
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}
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static int set_radio_sleep(struct dvb_frontend *fe)
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{
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struct tea5761_priv *priv = fe->analog_demod_priv;
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priv->standby = true;
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return __set_radio_freq(fe, priv->frequency, false);
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}
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static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
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{
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struct tea5761_priv *priv = fe->tuner_priv;
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int rc;
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memset(buffer, 0, 16);
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if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
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tuner_warn("i2c i/o error: rc == %d (should be 16)\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 tea5761_signal(struct dvb_frontend *fe, const char *buffer)
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{
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struct tea5761_priv *priv = fe->tuner_priv;
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int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
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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 tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
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{
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struct tea5761_priv *priv = fe->tuner_priv;
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int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
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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 tea5761_get_status(struct dvb_frontend *fe, u32 *status)
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{
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unsigned char buffer[16];
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*status = 0;
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if (0 == tea5761_read_status(fe, buffer)) {
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if (tea5761_signal(fe, buffer))
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*status = TUNER_STATUS_LOCKED;
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if (tea5761_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 tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
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{
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unsigned char buffer[16];
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*strength = 0;
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if (0 == tea5761_read_status(fe, buffer))
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*strength = tea5761_signal(fe, buffer);
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return 0;
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}
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int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
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{
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unsigned char buffer[16];
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int rc;
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struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
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if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
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printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
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return -EINVAL;
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}
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if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
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printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x. It is not a TEA5761\n",
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buffer[13], buffer[14], buffer[15]);
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return -EINVAL;
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}
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printk(KERN_WARNING "tea5761: TEA%02x%02x detected. Manufacturer ID= 0x%02x\n",
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buffer[14], buffer[15], buffer[13]);
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return 0;
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}
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static void tea5761_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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}
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static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct tea5761_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 const struct dvb_tuner_ops tea5761_tuner_ops = {
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.info = {
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.name = "tea5761", // Philips TEA5761HN FM Radio
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},
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.set_analog_params = set_radio_freq,
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.sleep = set_radio_sleep,
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.release = tea5761_release,
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.get_frequency = tea5761_get_frequency,
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.get_status = tea5761_get_status,
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.get_rf_strength = tea5761_get_rf_strength,
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};
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struct dvb_frontend *tea5761_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 tea5761_priv *priv = NULL;
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if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)
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return NULL;
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priv = kzalloc(sizeof(struct tea5761_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 = "tea5761";
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memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
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sizeof(struct dvb_tuner_ops));
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tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
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return fe;
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}
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EXPORT_SYMBOL_GPL(tea5761_attach);
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EXPORT_SYMBOL_GPL(tea5761_autodetection);
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MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
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MODULE_LICENSE("GPL v2");
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