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/slab.h> 32 #include <linux/module.h> 33 #include <linux/dvb/frontend.h> 34 #include <asm/types.h> 35 36 #include "tua6100.h" 37 38 struct tua6100_priv { 39 /* i2c details */ 40 int i2c_address; 41 struct i2c_adapter *i2c; 42 u32 frequency; 43 }; 44 45 static void tua6100_release(struct dvb_frontend *fe) 46 { 47 kfree(fe->tuner_priv); 48 fe->tuner_priv = NULL; 49 } 50 51 static 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", __func__); 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 69 static int tua6100_set_params(struct dvb_frontend *fe) 70 { 71 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 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 (c->frequency < 2000000) 88 reg0[1] = 0x03; 89 else 90 reg0[1] = 0x07; 91 92 // setup register 1 93 if (c->frequency < 1630000) 94 reg1[1] = 0x2c; 95 else 96 reg1[1] = 0x0c; 97 98 if (_P == 64) 99 reg1[1] |= 0x40; 100 if (c->frequency >= 1525000) 101 reg1[1] |= 0x80; 102 103 // register 2 104 reg2[1] = (_R >> 8) & 0x03; 105 reg2[2] = _R; 106 if (c->frequency < 1455000) 107 reg2[1] |= 0x1c; 108 else if (c->frequency < 1630000) 109 reg2[1] |= 0x0c; 110 else 111 reg2[1] |= 0x1c; 112 113 /* 114 * The N divisor ratio (note: c->frequency is in kHz, but we 115 * need it in Hz) 116 */ 117 prediv = (c->frequency * _R) / (_ri / 1000); 118 div = prediv / _P; 119 reg1[1] |= (div >> 9) & 0x03; 120 reg1[2] = div >> 1; 121 reg1[3] = (div << 7); 122 priv->frequency = ((div * _P) * (_ri / 1000)) / _R; 123 124 // Finally, calculate and store the value for A 125 reg1[3] |= (prediv - (div*_P)) & 0x7f; 126 127 #undef _R 128 #undef _P 129 #undef _ri 130 131 if (fe->ops.i2c_gate_ctrl) 132 fe->ops.i2c_gate_ctrl(fe, 1); 133 if (i2c_transfer(priv->i2c, &msg0, 1) != 1) 134 return -EIO; 135 136 if (fe->ops.i2c_gate_ctrl) 137 fe->ops.i2c_gate_ctrl(fe, 1); 138 if (i2c_transfer(priv->i2c, &msg2, 1) != 1) 139 return -EIO; 140 141 if (fe->ops.i2c_gate_ctrl) 142 fe->ops.i2c_gate_ctrl(fe, 1); 143 if (i2c_transfer(priv->i2c, &msg1, 1) != 1) 144 return -EIO; 145 146 if (fe->ops.i2c_gate_ctrl) 147 fe->ops.i2c_gate_ctrl(fe, 0); 148 149 return 0; 150 } 151 152 static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency) 153 { 154 struct tua6100_priv *priv = fe->tuner_priv; 155 *frequency = priv->frequency; 156 return 0; 157 } 158 159 static const struct dvb_tuner_ops tua6100_tuner_ops = { 160 .info = { 161 .name = "Infineon TUA6100", 162 .frequency_min = 950000, 163 .frequency_max = 2150000, 164 .frequency_step = 1000, 165 }, 166 .release = tua6100_release, 167 .sleep = tua6100_sleep, 168 .set_params = tua6100_set_params, 169 .get_frequency = tua6100_get_frequency, 170 }; 171 172 struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c) 173 { 174 struct tua6100_priv *priv = NULL; 175 u8 b1 [] = { 0x80 }; 176 u8 b2 [] = { 0x00 }; 177 struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 }, 178 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } }; 179 int ret; 180 181 if (fe->ops.i2c_gate_ctrl) 182 fe->ops.i2c_gate_ctrl(fe, 1); 183 ret = i2c_transfer (i2c, msg, 2); 184 if (fe->ops.i2c_gate_ctrl) 185 fe->ops.i2c_gate_ctrl(fe, 0); 186 187 if (ret != 2) 188 return NULL; 189 190 priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL); 191 if (priv == NULL) 192 return NULL; 193 194 priv->i2c_address = addr; 195 priv->i2c = i2c; 196 197 memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops)); 198 fe->tuner_priv = priv; 199 return fe; 200 } 201 EXPORT_SYMBOL(tua6100_attach); 202 203 MODULE_DESCRIPTION("DVB tua6100 driver"); 204 MODULE_AUTHOR("Andrew de Quincey"); 205 MODULE_LICENSE("GPL"); 206