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 27 #include <linux/slab.h> 28 #include <linux/module.h> 29 #include <linux/dvb/frontend.h> 30 #include <asm/types.h> 31 32 #include "tua6100.h" 33 34 struct tua6100_priv { 35 /* i2c details */ 36 int i2c_address; 37 struct i2c_adapter *i2c; 38 u32 frequency; 39 }; 40 41 static void tua6100_release(struct dvb_frontend *fe) 42 { 43 kfree(fe->tuner_priv); 44 fe->tuner_priv = NULL; 45 } 46 47 static int tua6100_sleep(struct dvb_frontend *fe) 48 { 49 struct tua6100_priv *priv = fe->tuner_priv; 50 int ret; 51 u8 reg0[] = { 0x00, 0x00 }; 52 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; 53 54 if (fe->ops.i2c_gate_ctrl) 55 fe->ops.i2c_gate_ctrl(fe, 1); 56 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { 57 printk("%s: i2c error\n", __func__); 58 } 59 if (fe->ops.i2c_gate_ctrl) 60 fe->ops.i2c_gate_ctrl(fe, 0); 61 62 return (ret == 1) ? 0 : ret; 63 } 64 65 static int tua6100_set_params(struct dvb_frontend *fe) 66 { 67 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 68 struct tua6100_priv *priv = fe->tuner_priv; 69 u32 div; 70 u32 prediv; 71 u8 reg0[] = { 0x00, 0x00 }; 72 u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 }; 73 u8 reg2[] = { 0x02, 0x00, 0x00 }; 74 struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; 75 struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 }; 76 struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 }; 77 78 #define _R 4 79 #define _P 32 80 #define _ri 4000000 81 82 // setup register 0 83 if (c->frequency < 2000000) 84 reg0[1] = 0x03; 85 else 86 reg0[1] = 0x07; 87 88 // setup register 1 89 if (c->frequency < 1630000) 90 reg1[1] = 0x2c; 91 else 92 reg1[1] = 0x0c; 93 94 if (_P == 64) 95 reg1[1] |= 0x40; 96 if (c->frequency >= 1525000) 97 reg1[1] |= 0x80; 98 99 // register 2 100 reg2[1] = (_R >> 8) & 0x03; 101 reg2[2] = _R; 102 if (c->frequency < 1455000) 103 reg2[1] |= 0x1c; 104 else if (c->frequency < 1630000) 105 reg2[1] |= 0x0c; 106 else 107 reg2[1] |= 0x1c; 108 109 /* 110 * The N divisor ratio (note: c->frequency is in kHz, but we 111 * need it in Hz) 112 */ 113 prediv = (c->frequency * _R) / (_ri / 1000); 114 div = prediv / _P; 115 reg1[1] |= (div >> 9) & 0x03; 116 reg1[2] = div >> 1; 117 reg1[3] = (div << 7); 118 priv->frequency = ((div * _P) * (_ri / 1000)) / _R; 119 120 // Finally, calculate and store the value for A 121 reg1[3] |= (prediv - (div*_P)) & 0x7f; 122 123 #undef _R 124 #undef _P 125 #undef _ri 126 127 if (fe->ops.i2c_gate_ctrl) 128 fe->ops.i2c_gate_ctrl(fe, 1); 129 if (i2c_transfer(priv->i2c, &msg0, 1) != 1) 130 return -EIO; 131 132 if (fe->ops.i2c_gate_ctrl) 133 fe->ops.i2c_gate_ctrl(fe, 1); 134 if (i2c_transfer(priv->i2c, &msg2, 1) != 1) 135 return -EIO; 136 137 if (fe->ops.i2c_gate_ctrl) 138 fe->ops.i2c_gate_ctrl(fe, 1); 139 if (i2c_transfer(priv->i2c, &msg1, 1) != 1) 140 return -EIO; 141 142 if (fe->ops.i2c_gate_ctrl) 143 fe->ops.i2c_gate_ctrl(fe, 0); 144 145 return 0; 146 } 147 148 static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency) 149 { 150 struct tua6100_priv *priv = fe->tuner_priv; 151 *frequency = priv->frequency; 152 return 0; 153 } 154 155 static const struct dvb_tuner_ops tua6100_tuner_ops = { 156 .info = { 157 .name = "Infineon TUA6100", 158 .frequency_min = 950000, 159 .frequency_max = 2150000, 160 .frequency_step = 1000, 161 }, 162 .release = tua6100_release, 163 .sleep = tua6100_sleep, 164 .set_params = tua6100_set_params, 165 .get_frequency = tua6100_get_frequency, 166 }; 167 168 struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c) 169 { 170 struct tua6100_priv *priv = NULL; 171 u8 b1 [] = { 0x80 }; 172 u8 b2 [] = { 0x00 }; 173 struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 }, 174 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } }; 175 int ret; 176 177 if (fe->ops.i2c_gate_ctrl) 178 fe->ops.i2c_gate_ctrl(fe, 1); 179 ret = i2c_transfer (i2c, msg, 2); 180 if (fe->ops.i2c_gate_ctrl) 181 fe->ops.i2c_gate_ctrl(fe, 0); 182 183 if (ret != 2) 184 return NULL; 185 186 priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL); 187 if (priv == NULL) 188 return NULL; 189 190 priv->i2c_address = addr; 191 priv->i2c = i2c; 192 193 memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops)); 194 fe->tuner_priv = priv; 195 return fe; 196 } 197 EXPORT_SYMBOL(tua6100_attach); 198 199 MODULE_DESCRIPTION("DVB tua6100 driver"); 200 MODULE_AUTHOR("Andrew de Quincey"); 201 MODULE_LICENSE("GPL"); 202