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- /*
- * For Philips TEA5761 FM Chip
- * I2C address is allways 0x20 (0x10 at 7-bit mode).
- *
- * Copyright (c) 2005-2007 Mauro Carvalho Chehab (mchehab@infradead.org)
- * This code is placed under the terms of the GNUv2 General Public License
- *
- */
- #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 int tea5761_release(struct dvb_frontend *fe)
- {
- kfree(fe->tuner_priv);
- fe->tuner_priv = NULL;
- return 0;
- }
- static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
- {
- struct tea5761_priv *priv = fe->tuner_priv;
- *frequency = priv->frequency;
- return 0;
- }
- static 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@infradead.org>");
- MODULE_LICENSE("GPL");
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