diff options
Diffstat (limited to 'drivers/media/tuners/tea5767.c')
| -rw-r--r-- | drivers/media/tuners/tea5767.c | 473 |
1 files changed, 473 insertions, 0 deletions
diff --git a/drivers/media/tuners/tea5767.c b/drivers/media/tuners/tea5767.c new file mode 100644 index 000000000..016d0d5ec --- /dev/null +++ b/drivers/media/tuners/tea5767.c @@ -0,0 +1,473 @@ +// SPDX-License-Identifier: GPL-2.0 +// For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview +// I2C address is always 0xC0. +// +// Copyright (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org> +// +// tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa +// from their contributions on DScaler. + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/i2c.h> +#include <linux/slab.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) { + pr_warn("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]) { + pr_warn("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)) { + pr_warn("Chip ID is not zero. It is not a TEA5767\n"); + return -EINVAL; + } + + + return 0; +} + +static void tea5767_release(struct dvb_frontend *fe) +{ + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; +} + +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 const 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@kernel.org>"); +MODULE_LICENSE("GPL v2"); |