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 30 static int debug; 31 #define dprintk(args...) \ 32 do { \ 33 if (debug) printk(KERN_DEBUG "tda826x: " args); \ 34 } while (0) 35 36 struct tda826x_priv { 37 /* i2c details */ 38 int i2c_address; 39 struct i2c_adapter *i2c; 40 u8 has_loopthrough:1; 41 u32 frequency; 42 }; 43 44 static int tda826x_release(struct dvb_frontend *fe) 45 { 46 kfree(fe->tuner_priv); 47 fe->tuner_priv = NULL; 48 return 0; 49 } 50 51 static 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 74 static int tda826x_set_params(struct dvb_frontend *fe) 75 { 76 struct dtv_frontend_properties *p = &fe->dtv_property_cache; 77 struct tda826x_priv *priv = fe->tuner_priv; 78 int ret; 79 u32 div; 80 u32 ksyms; 81 u32 bandwidth; 82 u8 buf [11]; 83 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 }; 84 85 dprintk("%s:\n", __func__); 86 87 div = (p->frequency + (1000-1)) / 1000; 88 89 /* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */ 90 /* with R0 = 0.35 and some transformations: */ 91 ksyms = p->symbol_rate / 1000; 92 bandwidth = (878 * ksyms + 6500000) / 1000000 + 1; 93 if (bandwidth < 5) 94 bandwidth = 5; 95 else if (bandwidth > 36) 96 bandwidth = 36; 97 98 buf[0] = 0x00; // subaddress 99 buf[1] = 0x09; // powerdown RSSI + the magic value 1 100 if (!priv->has_loopthrough) 101 buf[1] |= 0x20; // power down loopthrough if not needed 102 buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO 103 buf[3] = div >> 7; 104 buf[4] = div << 1; 105 buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */ 106 buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation 107 buf[7] = 0x83; // charge pumps at high, tests off 108 buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports. 109 buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL 110 buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on 111 112 if (fe->ops.i2c_gate_ctrl) 113 fe->ops.i2c_gate_ctrl(fe, 1); 114 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { 115 dprintk("%s: i2c error\n", __func__); 116 } 117 if (fe->ops.i2c_gate_ctrl) 118 fe->ops.i2c_gate_ctrl(fe, 0); 119 120 priv->frequency = div * 1000; 121 122 return (ret == 1) ? 0 : ret; 123 } 124 125 static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency) 126 { 127 struct tda826x_priv *priv = fe->tuner_priv; 128 *frequency = priv->frequency; 129 return 0; 130 } 131 132 static struct dvb_tuner_ops tda826x_tuner_ops = { 133 .info = { 134 .name = "Philips TDA826X", 135 .frequency_min = 950000, 136 .frequency_max = 2175000 137 }, 138 .release = tda826x_release, 139 .sleep = tda826x_sleep, 140 .set_params = tda826x_set_params, 141 .get_frequency = tda826x_get_frequency, 142 }; 143 144 struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough) 145 { 146 struct tda826x_priv *priv = NULL; 147 u8 b1 [] = { 0, 0 }; 148 struct i2c_msg msg[2] = { 149 { .addr = addr, .flags = 0, .buf = NULL, .len = 0 }, 150 { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 } 151 }; 152 int ret; 153 154 dprintk("%s:\n", __func__); 155 156 if (fe->ops.i2c_gate_ctrl) 157 fe->ops.i2c_gate_ctrl(fe, 1); 158 ret = i2c_transfer (i2c, msg, 2); 159 if (fe->ops.i2c_gate_ctrl) 160 fe->ops.i2c_gate_ctrl(fe, 0); 161 162 if (ret != 2) 163 return NULL; 164 if (!(b1[1] & 0x80)) 165 return NULL; 166 167 priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL); 168 if (priv == NULL) 169 return NULL; 170 171 priv->i2c_address = addr; 172 priv->i2c = i2c; 173 priv->has_loopthrough = has_loopthrough; 174 175 memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops)); 176 177 fe->tuner_priv = priv; 178 179 return fe; 180 } 181 EXPORT_SYMBOL(tda826x_attach); 182 183 module_param(debug, int, 0644); 184 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 185 186 MODULE_DESCRIPTION("DVB TDA826x driver"); 187 MODULE_AUTHOR("Andrew de Quincey"); 188 MODULE_LICENSE("GPL"); 189