1/** 2 * Driver for Infineon tua6100 pll. 3 * 4 * (c) 2006 Andrew de Quincey 5 * 6 * Based on code found in budget-av.c, which has the following: 7 * Compiled from various sources by Michael Hunold <michael@mihu.de> 8 * 9 * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> & 10 * Andrew de Quincey <adq_dvb@lidskialf.net> 11 * 12 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de> 13 * 14 * Copyright (C) 1999-2002 Ralph Metzler 15 * & Marcus Metzler for convergence integrated media GmbH 16 * This program is free software; you can redistribute it and/or modify 17 * it under the terms of the GNU General Public License as published by 18 * the Free Software Foundation; either version 2 of the License, or 19 * (at your option) any later version. 20 * 21 * This program is distributed in the hope that it will be useful, 22 * but WITHOUT ANY WARRANTY; without even the implied warranty of 23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24 * GNU General Public License for more details. 25 * 26 * You should have received a copy of the GNU General Public License 27 * along with this program; if not, write to the Free Software 28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 29 */ 30 31#include <linux/module.h> 32#include <linux/dvb/frontend.h> 33#include <asm/types.h> 34 35#include "tua6100.h" 36 37struct tua6100_priv { 38 /* i2c details */ 39 int i2c_address; 40 struct i2c_adapter *i2c; 41 u32 frequency; 42}; 43 44static int tua6100_release(struct dvb_frontend *fe) 45{ 46 kfree(fe->tuner_priv); 47 fe->tuner_priv = NULL; 48 return 0; 49} 50 51static int tua6100_sleep(struct dvb_frontend *fe) 52{ 53 struct tua6100_priv *priv = fe->tuner_priv; 54 int ret; 55 u8 reg0[] = { 0x00, 0x00 }; 56 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; 57 58 if (fe->ops.i2c_gate_ctrl) 59 fe->ops.i2c_gate_ctrl(fe, 1); 60 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { 61 printk("%s: i2c error\n", __FUNCTION__); 62 } 63 if (fe->ops.i2c_gate_ctrl) 64 fe->ops.i2c_gate_ctrl(fe, 0); 65 66 return (ret == 1) ? 0 : ret; 67} 68 69static int tua6100_set_params(struct dvb_frontend *fe, 70 struct dvb_frontend_parameters *params) 71{ 72 struct tua6100_priv *priv = fe->tuner_priv; 73 u32 div; 74 u32 prediv; 75 u8 reg0[] = { 0x00, 0x00 }; 76 u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 }; 77 u8 reg2[] = { 0x02, 0x00, 0x00 }; 78 struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; 79 struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 }; 80 struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 }; 81 82#define _R 4 83#define _P 32 84#define _ri 4000000 85 86 // setup register 0 87 if (params->frequency < 2000000) { 88 reg0[1] = 0x03; 89 } else { 90 reg0[1] = 0x07; 91 } 92 93 // setup register 1 94 if (params->frequency < 1630000) { 95 reg1[1] = 0x2c; 96 } else { 97 reg1[1] = 0x0c; 98 } 99 if (_P == 64) 100 reg1[1] |= 0x40; 101 if (params->frequency >= 1525000) 102 reg1[1] |= 0x80; 103 104 // register 2 105 reg2[1] = (_R >> 8) & 0x03; 106 reg2[2] = _R; 107 if (params->frequency < 1455000) { 108 reg2[1] |= 0x1c; 109 } else if (params->frequency < 1630000) { 110 reg2[1] |= 0x0c; 111 } else { 112 reg2[1] |= 0x1c; 113 } 114 115 // The N divisor ratio (note: params->frequency is in kHz, but we need it in Hz) 116 prediv = (params->frequency * _R) / (_ri / 1000); 117 div = prediv / _P; 118 reg1[1] |= (div >> 9) & 0x03; 119 reg1[2] = div >> 1; 120 reg1[3] = (div << 7); 121 priv->frequency = ((div * _P) * (_ri / 1000)) / _R; 122 123 // Finally, calculate and store the value for A 124 reg1[3] |= (prediv - (div*_P)) & 0x7f; 125 126#undef _R 127#undef _P 128#undef _ri 129 130 if (fe->ops.i2c_gate_ctrl) 131 fe->ops.i2c_gate_ctrl(fe, 1); 132 if (i2c_transfer(priv->i2c, &msg0, 1) != 1) 133 return -EIO; 134 135 if (fe->ops.i2c_gate_ctrl) 136 fe->ops.i2c_gate_ctrl(fe, 1); 137 if (i2c_transfer(priv->i2c, &msg2, 1) != 1) 138 return -EIO; 139 140 if (fe->ops.i2c_gate_ctrl) 141 fe->ops.i2c_gate_ctrl(fe, 1); 142 if (i2c_transfer(priv->i2c, &msg1, 1) != 1) 143 return -EIO; 144 145 if (fe->ops.i2c_gate_ctrl) 146 fe->ops.i2c_gate_ctrl(fe, 0); 147 148 return 0; 149} 150 151static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency) 152{ 153 struct tua6100_priv *priv = fe->tuner_priv; 154 *frequency = priv->frequency; 155 return 0; 156} 157 158static struct dvb_tuner_ops tua6100_tuner_ops = { 159 .info = { 160 .name = "Infineon TUA6100", 161 .frequency_min = 950000, 162 .frequency_max = 2150000, 163 .frequency_step = 1000, 164 }, 165 .release = tua6100_release, 166 .sleep = tua6100_sleep, 167 .set_params = tua6100_set_params, 168 .get_frequency = tua6100_get_frequency, 169}; 170 171struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c) 172{ 173 struct tua6100_priv *priv = NULL; 174 u8 b1 [] = { 0x80 }; 175 u8 b2 [] = { 0x00 }; 176 struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 }, 177 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } }; 178 int ret; 179 180 if (fe->ops.i2c_gate_ctrl) 181 fe->ops.i2c_gate_ctrl(fe, 1); 182 ret = i2c_transfer (i2c, msg, 2); 183 if (fe->ops.i2c_gate_ctrl) 184 fe->ops.i2c_gate_ctrl(fe, 0); 185 186 if (ret != 2) 187 return NULL; 188 189 priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL); 190 if (priv == NULL) 191 return NULL; 192 193 priv->i2c_address = addr; 194 priv->i2c = i2c; 195 196 memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops)); 197 fe->tuner_priv = priv; 198 return fe; 199} 200EXPORT_SYMBOL(tua6100_attach); 201 202MODULE_DESCRIPTION("DVB tua6100 driver"); 203MODULE_AUTHOR("Andrew de Quincey"); 204MODULE_LICENSE("GPL"); 205