diff options
Diffstat (limited to 'drivers/media/tuners/tea5761.c')
| -rw-r--r-- | drivers/media/tuners/tea5761.c | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/drivers/media/tuners/tea5761.c b/drivers/media/tuners/tea5761.c new file mode 100644 index 0000000000..d78a2bdb3e --- /dev/null +++ b/drivers/media/tuners/tea5761.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0 +// For Philips TEA5761 FM Chip +// I2C address is always 0x20 (0x10 at 7-bit mode). +// +// Copyright (c) 2005-2007 Mauro Carvalho Chehab <mchehab@kernel.org> + +#include <linux/i2c.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/videodev2.h> +#include <media/tuner.h> +#include "tuner-i2c.h" +#include "tea5761.h" + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "enable verbose debug messages"); + +struct tea5761_priv { + struct tuner_i2c_props i2c_props; + + u32 frequency; + bool standby; +}; + +/*****************************************************************************/ + +/*************************** + * TEA5761HN I2C registers * + ***************************/ + +/* INTREG - Read: bytes 0 and 1 / Write: byte 0 */ + + /* first byte for reading */ +#define TEA5761_INTREG_IFFLAG 0x10 +#define TEA5761_INTREG_LEVFLAG 0x8 +#define TEA5761_INTREG_FRRFLAG 0x2 +#define TEA5761_INTREG_BLFLAG 0x1 + + /* second byte for reading / byte for writing */ +#define TEA5761_INTREG_IFMSK 0x10 +#define TEA5761_INTREG_LEVMSK 0x8 +#define TEA5761_INTREG_FRMSK 0x2 +#define TEA5761_INTREG_BLMSK 0x1 + +/* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */ + + /* First byte */ +#define TEA5761_FRQSET_SEARCH_UP 0x80 /* 1=Station search from botton to up */ +#define TEA5761_FRQSET_SEARCH_MODE 0x40 /* 1=Search mode */ + + /* Bits 0-5 for divider MSB */ + + /* Second byte */ + /* Bits 0-7 for divider LSB */ + +/* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */ + + /* first byte */ + +#define TEA5761_TNCTRL_PUPD_0 0x40 /* Power UP/Power Down MSB */ +#define TEA5761_TNCTRL_BLIM 0X20 /* 1= Japan Frequencies, 0= European frequencies */ +#define TEA5761_TNCTRL_SWPM 0x10 /* 1= software port is FRRFLAG */ +#define TEA5761_TNCTRL_IFCTC 0x08 /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */ +#define TEA5761_TNCTRL_AFM 0x04 +#define TEA5761_TNCTRL_SMUTE 0x02 /* 1= Soft mute */ +#define TEA5761_TNCTRL_SNC 0x01 + + /* second byte */ + +#define TEA5761_TNCTRL_MU 0x80 /* 1=Hard mute */ +#define TEA5761_TNCTRL_SSL_1 0x40 +#define TEA5761_TNCTRL_SSL_0 0x20 +#define TEA5761_TNCTRL_HLSI 0x10 +#define TEA5761_TNCTRL_MST 0x08 /* 1 = mono */ +#define TEA5761_TNCTRL_SWP 0x04 +#define TEA5761_TNCTRL_DTC 0x02 /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */ +#define TEA5761_TNCTRL_AHLSI 0x01 + +/* FRQCHECK - Read: bytes 6 and 7 */ + /* First byte */ + + /* Bits 0-5 for divider MSB */ + + /* Second byte */ + /* Bits 0-7 for divider LSB */ + +/* TUNCHECK - Read: bytes 8 and 9 */ + + /* First byte */ +#define TEA5761_TUNCHECK_IF_MASK 0x7e /* IF count */ +#define TEA5761_TUNCHECK_TUNTO 0x01 + + /* Second byte */ +#define TEA5761_TUNCHECK_LEV_MASK 0xf0 /* Level Count */ +#define TEA5761_TUNCHECK_LD 0x08 +#define TEA5761_TUNCHECK_STEREO 0x04 + +/* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */ + + /* All zero = no test mode */ + +/* MANID - Read: bytes 12 and 13 */ + + /* First byte - should be 0x10 */ +#define TEA5767_MANID_VERSION_MASK 0xf0 /* Version = 1 */ +#define TEA5767_MANID_ID_MSB_MASK 0x0f /* Manufacurer ID - should be 0 */ + + /* Second byte - Should be 0x2b */ + +#define TEA5767_MANID_ID_LSB_MASK 0xfe /* Manufacturer ID - should be 0x15 */ +#define TEA5767_MANID_IDAV 0x01 /* 1 = Chip has ID, 0 = Chip has no ID */ + +/* Chip ID - Read: bytes 14 and 15 */ + + /* First byte - should be 0x57 */ + + /* Second byte - should be 0x61 */ + +/*****************************************************************************/ + +#define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */ +static void tea5761_status_dump(unsigned char *buffer) +{ + unsigned int div, frq; + + div = ((buffer[2] & 0x3f) << 8) | buffer[3]; + + frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4; /* Freq in KHz */ + + printk(KERN_INFO "tea5761: Frequency %d.%03d KHz (divider = 0x%04x)\n", + frq / 1000, frq % 1000, div); +} + +/* Freq should be specifyed at 62.5 Hz */ +static int __set_radio_freq(struct dvb_frontend *fe, + unsigned int freq, + bool mono) +{ + struct tea5761_priv *priv = fe->tuner_priv; + unsigned int frq = freq; + unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 }; + unsigned div; + int rc; + + tuner_dbg("radio freq counter %d\n", frq); + + if (priv->standby) { + tuner_dbg("TEA5761 set to standby mode\n"); + buffer[5] |= TEA5761_TNCTRL_MU; + } else { + buffer[4] |= TEA5761_TNCTRL_PUPD_0; + } + + + if (mono) { + tuner_dbg("TEA5761 set to mono\n"); + buffer[5] |= TEA5761_TNCTRL_MST; + } else { + tuner_dbg("TEA5761 set to stereo\n"); + } + + div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15; + buffer[1] = (div >> 8) & 0x3f; + buffer[2] = div & 0xff; + + if (debug) + tea5761_status_dump(buffer); + + if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7))) + tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc); + + priv->frequency = frq * 125 / 2; + + return 0; +} + +static int set_radio_freq(struct dvb_frontend *fe, + struct analog_parameters *params) +{ + struct tea5761_priv *priv = fe->analog_demod_priv; + + priv->standby = false; + + return __set_radio_freq(fe, params->frequency, + params->audmode == V4L2_TUNER_MODE_MONO); +} + +static int set_radio_sleep(struct dvb_frontend *fe) +{ + struct tea5761_priv *priv = fe->analog_demod_priv; + + priv->standby = true; + + return __set_radio_freq(fe, priv->frequency, false); +} + +static int tea5761_read_status(struct dvb_frontend *fe, char *buffer) +{ + struct tea5761_priv *priv = fe->tuner_priv; + int rc; + + memset(buffer, 0, 16); + if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) { + tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc); + return -EREMOTEIO; + } + + return 0; +} + +static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer) +{ + struct tea5761_priv *priv = fe->tuner_priv; + + int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4)); + + tuner_dbg("Signal strength: %d\n", signal); + + return signal; +} + +static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer) +{ + struct tea5761_priv *priv = fe->tuner_priv; + + int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO; + + tuner_dbg("Radio ST GET = %02x\n", stereo); + + return (stereo ? V4L2_TUNER_SUB_STEREO : 0); +} + +static int tea5761_get_status(struct dvb_frontend *fe, u32 *status) +{ + unsigned char buffer[16]; + + *status = 0; + + if (0 == tea5761_read_status(fe, buffer)) { + if (tea5761_signal(fe, buffer)) + *status = TUNER_STATUS_LOCKED; + if (tea5761_stereo(fe, buffer)) + *status |= TUNER_STATUS_STEREO; + } + + return 0; +} + +static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength) +{ + unsigned char buffer[16]; + + *strength = 0; + + if (0 == tea5761_read_status(fe, buffer)) + *strength = tea5761_signal(fe, buffer); + + return 0; +} + +int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr) +{ + unsigned char buffer[16]; + int rc; + struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr }; + + if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) { + printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc); + return -EINVAL; + } + + if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) { + printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x. It is not a TEA5761\n", + buffer[13], buffer[14], buffer[15]); + return -EINVAL; + } + printk(KERN_WARNING "tea5761: TEA%02x%02x detected. Manufacturer ID= 0x%02x\n", + buffer[14], buffer[15], buffer[13]); + + return 0; +} + +static void tea5761_release(struct dvb_frontend *fe) +{ + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; +} + +static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + struct tea5761_priv *priv = fe->tuner_priv; + *frequency = priv->frequency; + return 0; +} + +static const struct dvb_tuner_ops tea5761_tuner_ops = { + .info = { + .name = "tea5761", // Philips TEA5761HN FM Radio + }, + .set_analog_params = set_radio_freq, + .sleep = set_radio_sleep, + .release = tea5761_release, + .get_frequency = tea5761_get_frequency, + .get_status = tea5761_get_status, + .get_rf_strength = tea5761_get_rf_strength, +}; + +struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe, + struct i2c_adapter* i2c_adap, + u8 i2c_addr) +{ + struct tea5761_priv *priv = NULL; + + if (tea5761_autodetection(i2c_adap, i2c_addr) != 0) + return NULL; + + priv = kzalloc(sizeof(struct tea5761_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 = "tea5761"; + + memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops, + sizeof(struct dvb_tuner_ops)); + + tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio"); + + return fe; +} + + +EXPORT_SYMBOL_GPL(tea5761_attach); +EXPORT_SYMBOL_GPL(tea5761_autodetection); + +MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver"); +MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>"); +MODULE_LICENSE("GPL v2"); |