LXR linux/drivers/media/dvb-frontends/tda826x.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2  /*
   3     Driver for Philips tda8262/tda8263 DVBS Silicon tuners
   4
   5     (c) 2006 Andrew de Quincey
   6
   7
   8  */
   9
  10#include <linux/slab.h>
  11#include <linux/module.h>
  12#include <linux/dvb/frontend.h>
  13#include <asm/types.h>
  14
  15#include "tda826x.h"
  16
  17static int debug;
  18#define dprintk(args...) \
  19        do { \
  20                if (debug) printk(KERN_DEBUG "tda826x: " args); \
  21        } while (0)
  22
  23struct tda826x_priv {
  24        /* i2c details */
  25        int i2c_address;
  26        struct i2c_adapter *i2c;
  27        u8 has_loopthrough:1;
  28        u32 frequency;
  29};
  30
  31static void tda826x_release(struct dvb_frontend *fe)
  32{
  33        kfree(fe->tuner_priv);
  34        fe->tuner_priv = NULL;
  35}
  36
  37static int tda826x_sleep(struct dvb_frontend *fe)
  38{
  39        struct tda826x_priv *priv = fe->tuner_priv;
  40        int ret;
  41        u8 buf [] = { 0x00, 0x8d };
  42        struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };
  43
  44        dprintk("%s:\n", __func__);
  45
  46        if (!priv->has_loopthrough)
  47                buf[1] = 0xad;
  48
  49        if (fe->ops.i2c_gate_ctrl)
  50                fe->ops.i2c_gate_ctrl(fe, 1);
  51        if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
  52                dprintk("%s: i2c error\n", __func__);
  53        }
  54        if (fe->ops.i2c_gate_ctrl)
  55                fe->ops.i2c_gate_ctrl(fe, 0);
  56
  57        return (ret == 1) ? 0 : ret;
  58}
  59
  60static int tda826x_set_params(struct dvb_frontend *fe)
  61{
  62        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
  63        struct tda826x_priv *priv = fe->tuner_priv;
  64        int ret;
  65        u32 div;
  66        u32 ksyms;
  67        u32 bandwidth;
  68        u8 buf [11];
  69        struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
  70
  71        dprintk("%s:\n", __func__);
  72
  73        div = (p->frequency + (1000-1)) / 1000;
  74
  75        /* BW = ((1 + RO) * SR/2 + 5) * 1.3      [SR in MSPS, BW in MHz] */
  76        /* with R0 = 0.35 and some transformations: */
  77        ksyms = p->symbol_rate / 1000;
  78        bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
  79        if (bandwidth < 5)
  80                bandwidth = 5;
  81        else if (bandwidth > 36)
  82                bandwidth = 36;
  83
  84        buf[0] = 0x00; // subaddress
  85        buf[1] = 0x09; // powerdown RSSI + the magic value 1
  86        if (!priv->has_loopthrough)
  87                buf[1] |= 0x20; // power down loopthrough if not needed
  88        buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
  89        buf[3] = div >> 7;
  90        buf[4] = div << 1;
  91        buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
  92        buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
  93        buf[7] = 0x83; // charge pumps at high, tests off
  94        buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
  95        buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
  96        buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on
  97
  98        if (fe->ops.i2c_gate_ctrl)
  99                fe->ops.i2c_gate_ctrl(fe, 1);
 100        if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
 101                dprintk("%s: i2c error\n", __func__);
 102        }
 103        if (fe->ops.i2c_gate_ctrl)
 104                fe->ops.i2c_gate_ctrl(fe, 0);
 105
 106        priv->frequency = div * 1000;
 107
 108        return (ret == 1) ? 0 : ret;
 109}
 110
 111static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 112{
 113        struct tda826x_priv *priv = fe->tuner_priv;
 114        *frequency = priv->frequency;
 115        return 0;
 116}
 117
 118static const struct dvb_tuner_ops tda826x_tuner_ops = {
 119        .info = {
 120                .name = "Philips TDA826X",
 121                .frequency_min_hz =  950 * MHz,
 122                .frequency_max_hz = 2175 * MHz
 123        },
 124        .release = tda826x_release,
 125        .sleep = tda826x_sleep,
 126        .set_params = tda826x_set_params,
 127        .get_frequency = tda826x_get_frequency,
 128};
 129
 130struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
 131{
 132        struct tda826x_priv *priv = NULL;
 133        u8 b1 [] = { 0, 0 };
 134        struct i2c_msg msg[2] = {
 135                { .addr = addr, .flags = 0,        .buf = NULL, .len = 0 },
 136                { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
 137        };
 138        int ret;
 139
 140        dprintk("%s:\n", __func__);
 141
 142        if (fe->ops.i2c_gate_ctrl)
 143                fe->ops.i2c_gate_ctrl(fe, 1);
 144        ret = i2c_transfer (i2c, msg, 2);
 145        if (fe->ops.i2c_gate_ctrl)
 146                fe->ops.i2c_gate_ctrl(fe, 0);
 147
 148        if (ret != 2)
 149                return NULL;
 150        if (!(b1[1] & 0x80))
 151                return NULL;
 152
 153        priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
 154        if (priv == NULL)
 155                return NULL;
 156
 157        priv->i2c_address = addr;
 158        priv->i2c = i2c;
 159        priv->has_loopthrough = has_loopthrough;
 160
 161        memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));
 162
 163        fe->tuner_priv = priv;
 164
 165        return fe;
 166}
 167EXPORT_SYMBOL(tda826x_attach);
 168
 169module_param(debug, int, 0644);
 170MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 171
 172MODULE_DESCRIPTION("DVB TDA826x driver");
 173MODULE_AUTHOR("Andrew de Quincey");
 174MODULE_LICENSE("GPL");
 175