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