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  * 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");