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1// SPDX-License-Identifier: GPL-2.0-or-later2 /*3 Driver for Philips tda8262/tda8263 DVBS Silicon tuners4 5 (c) 2006 Andrew de Quincey6 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; // subaddress85 buf[1] = 0x09; // powerdown RSSI + the magic value 186 if (!priv->has_loopthrough)87 buf[1] |= 0x20; // power down loopthrough if not needed88 buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO89 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 attenuation93 buf[7] = 0x83; // charge pumps at high, tests off94 buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.95 buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL96 buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on97 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 * MHz123 },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_GPL(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