drivers/media/dvb-frontends/tua6100.c

   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");