1 /* 2 Driver for Philips tda8262/tda8263 DVBS Silicon tuners 3 4 (c) 2006 Andrew de Quincey 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 21 */ 22 23#include <linux/slab.h> 24#include <linux/module.h> 25#include <linux/dvb/frontend.h> 26#include <asm/types.h> 27 28#include "tda826x.h" 29 30static int debug; 31#define dprintk(args...) \ 32 do { \ 33 if (debug) printk(KERN_DEBUG "tda826x: " args); \ 34 } while (0) 35 36struct tda826x_priv { 37 /* i2c details */ 38 int i2c_address; 39 struct i2c_adapter *i2c; 40 u8 has_loopthrough:1; 41 u32 frequency; 42}; 43 44static int tda826x_release(struct dvb_frontend *fe) 45{ 46 kfree(fe->tuner_priv); 47 fe->tuner_priv = NULL; 48 return 0; 49} 50 51static int tda826x_sleep(struct dvb_frontend *fe) 52{ 53 struct tda826x_priv *priv = fe->tuner_priv; 54 int ret; 55 u8 buf [] = { 0x00, 0x8d }; 56 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 }; 57 58 dprintk("%s:\n", __func__); 59 60 if (!priv->has_loopthrough) 61 buf[1] = 0xad; 62 63 if (fe->ops.i2c_gate_ctrl) 64 fe->ops.i2c_gate_ctrl(fe, 1); 65 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { 66 dprintk("%s: i2c error\n", __func__); 67 } 68 if (fe->ops.i2c_gate_ctrl) 69 fe->ops.i2c_gate_ctrl(fe, 0); 70 71 return (ret == 1) ? 0 : ret; 72} 73 74static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params) 75{ 76 struct tda826x_priv *priv = fe->tuner_priv; 77 int ret; 78 u32 div; 79 u32 ksyms; 80 u32 bandwidth; 81 u8 buf [11]; 82 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 }; 83 84 dprintk("%s:\n", __func__); 85 86 div = (params->frequency + (1000-1)) / 1000; 87 88 /* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */ 89 /* with R0 = 0.35 and some transformations: */ 90 ksyms = params->u.qpsk.symbol_rate / 1000; 91 bandwidth = (878 * ksyms + 6500000) / 1000000 + 1; 92 if (bandwidth < 5) 93 bandwidth = 5; 94 else if (bandwidth > 36) 95 bandwidth = 36; 96 97 buf[0] = 0x00; // subaddress 98 buf[1] = 0x09; // powerdown RSSI + the magic value 1 99 if (!priv->has_loopthrough) 100 buf[1] |= 0x20; // power down loopthrough if not needed 101 buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO 102 buf[3] = div >> 7; 103 buf[4] = div << 1; 104 buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */ 105 buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation 106 buf[7] = 0x83; // charge pumps at high, tests off 107 buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports. 108 buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL 109 buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on 110 111 if (fe->ops.i2c_gate_ctrl) 112 fe->ops.i2c_gate_ctrl(fe, 1); 113 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { 114 dprintk("%s: i2c error\n", __func__); 115 } 116 if (fe->ops.i2c_gate_ctrl) 117 fe->ops.i2c_gate_ctrl(fe, 0); 118 119 priv->frequency = div * 1000; 120 121 return (ret == 1) ? 0 : ret; 122} 123 124static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency) 125{ 126 struct tda826x_priv *priv = fe->tuner_priv; 127 *frequency = priv->frequency; 128 return 0; 129} 130 131static struct dvb_tuner_ops tda826x_tuner_ops = { 132 .info = { 133 .name = "Philips TDA826X", 134 .frequency_min = 950000, 135 .frequency_max = 2175000 136 }, 137 .release = tda826x_release, 138 .sleep = tda826x_sleep, 139 .set_params = tda826x_set_params, 140 .get_frequency = tda826x_get_frequency, 141}; 142 143struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough) 144{ 145 struct tda826x_priv *priv = NULL; 146 u8 b1 [] = { 0, 0 }; 147 struct i2c_msg msg[2] = { 148 { .addr = addr, .flags = 0, .buf = NULL, .len = 0 }, 149 { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 } 150 }; 151 int ret; 152 153 dprintk("%s:\n", __func__); 154 155 if (fe->ops.i2c_gate_ctrl) 156 fe->ops.i2c_gate_ctrl(fe, 1); 157 ret = i2c_transfer (i2c, msg, 2); 158 if (fe->ops.i2c_gate_ctrl) 159 fe->ops.i2c_gate_ctrl(fe, 0); 160 161 if (ret != 2) 162 return NULL; 163 if (!(b1[1] & 0x80)) 164 return NULL; 165 166 priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL); 167 if (priv == NULL) 168 return NULL; 169 170 priv->i2c_address = addr; 171 priv->i2c = i2c; 172 priv->has_loopthrough = has_loopthrough; 173 174 memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops)); 175 176 fe->tuner_priv = priv; 177 178 return fe; 179} 180EXPORT_SYMBOL(tda826x_attach); 181 182module_param(debug, int, 0644); 183MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 184 185MODULE_DESCRIPTION("DVB TDA826x driver"); 186MODULE_AUTHOR("Andrew de Quincey"); 187MODULE_LICENSE("GPL"); 188