tda826x.c (4378B)
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");