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 int tua6100_release(struct dvb_frontend *fe)
  46 {
  47         kfree(fe->tuner_priv);
  48         fe->tuner_priv = NULL;
  49         return 0;
  50 }
  51
  52 static int tua6100_sleep(struct dvb_frontend *fe)
  53 {
  54         struct tua6100_priv *priv = fe->tuner_priv;
  55         int ret;
  56         u8 reg0[] = { 0x00, 0x00 };
  57         struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
  58
  59         if (fe->ops.i2c_gate_ctrl)
  60                 fe->ops.i2c_gate_ctrl(fe, 1);
  61         if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
  62                 printk("%s: i2c error\n", __func__);
  63         }
  64         if (fe->ops.i2c_gate_ctrl)
  65                 fe->ops.i2c_gate_ctrl(fe, 0);
  66
  67         return (ret == 1) ? 0 : ret;
  68 }
  69
  70 static int tua6100_set_params(struct dvb_frontend *fe)
  71 {
  72         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  73         struct tua6100_priv *priv = fe->tuner_priv;
  74         u32 div;
  75         u32 prediv;
  76         u8 reg0[] = { 0x00, 0x00 };
  77         u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 };
  78         u8 reg2[] = { 0x02, 0x00, 0x00 };
  79         struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
  80         struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 };
  81         struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 };
  82
  83 #define _R 4
  84 #define _P 32
  85 #define _ri 4000000
  86
  87         // setup register 0
  88         if (c->frequency < 2000000)
  89                 reg0[1] = 0x03;
  90         else
  91                 reg0[1] = 0x07;
  92
  93         // setup register 1
  94         if (c->frequency < 1630000)
  95                 reg1[1] = 0x2c;
  96         else
  97                 reg1[1] = 0x0c;
  98
  99         if (_P == 64)
 100                 reg1[1] |= 0x40;
 101         if (c->frequency >= 1525000)
 102                 reg1[1] |= 0x80;
 103
 104         // register 2
 105         reg2[1] = (_R >> 8) & 0x03;
 106         reg2[2] = _R;
 107         if (c->frequency < 1455000)
 108                 reg2[1] |= 0x1c;
 109         else if (c->frequency < 1630000)
 110                 reg2[1] |= 0x0c;
 111         else
 112                 reg2[1] |= 0x1c;
 113
 114         /*
 115          * The N divisor ratio (note: c->frequency is in kHz, but we
 116          * need it in Hz)
 117          */
 118         prediv = (c->frequency * _R) / (_ri / 1000);
 119         div = prediv / _P;
 120         reg1[1] |= (div >> 9) & 0x03;
 121         reg1[2] = div >> 1;
 122         reg1[3] = (div << 7);
 123         priv->frequency = ((div * _P) * (_ri / 1000)) / _R;
 124
 125         // Finally, calculate and store the value for A
 126         reg1[3] |= (prediv - (div*_P)) & 0x7f;
 127
 128 #undef _R
 129 #undef _P
 130 #undef _ri
 131
 132         if (fe->ops.i2c_gate_ctrl)
 133                 fe->ops.i2c_gate_ctrl(fe, 1);
 134         if (i2c_transfer(priv->i2c, &msg0, 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, &msg2, 1) != 1)
 140                 return -EIO;
 141
 142         if (fe->ops.i2c_gate_ctrl)
 143                 fe->ops.i2c_gate_ctrl(fe, 1);
 144         if (i2c_transfer(priv->i2c, &msg1, 1) != 1)
 145                 return -EIO;
 146
 147         if (fe->ops.i2c_gate_ctrl)
 148                 fe->ops.i2c_gate_ctrl(fe, 0);
 149
 150         return 0;
 151 }
 152
 153 static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 154 {
 155         struct tua6100_priv *priv = fe->tuner_priv;
 156         *frequency = priv->frequency;
 157         return 0;
 158 }
 159
 160 static struct dvb_tuner_ops tua6100_tuner_ops = {
 161         .info = {
 162                 .name = "Infineon TUA6100",
 163                 .frequency_min = 950000,
 164                 .frequency_max = 2150000,
 165                 .frequency_step = 1000,
 166         },
 167         .release = tua6100_release,
 168         .sleep = tua6100_sleep,
 169         .set_params = tua6100_set_params,
 170         .get_frequency = tua6100_get_frequency,
 171 };
 172
 173 struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c)
 174 {
 175         struct tua6100_priv *priv = NULL;
 176         u8 b1 [] = { 0x80 };
 177         u8 b2 [] = { 0x00 };
 178         struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 },
 179                                   { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } };
 180         int ret;
 181
 182         if (fe->ops.i2c_gate_ctrl)
 183                 fe->ops.i2c_gate_ctrl(fe, 1);
 184         ret = i2c_transfer (i2c, msg, 2);
 185         if (fe->ops.i2c_gate_ctrl)
 186                 fe->ops.i2c_gate_ctrl(fe, 0);
 187
 188         if (ret != 2)
 189                 return NULL;
 190
 191         priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL);
 192         if (priv == NULL)
 193                 return NULL;
 194
 195         priv->i2c_address = addr;
 196         priv->i2c = i2c;
 197
 198         memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops));
 199         fe->tuner_priv = priv;
 200         return fe;
 201 }
 202 EXPORT_SYMBOL(tua6100_attach);
 203
 204 MODULE_DESCRIPTION("DVB tua6100 driver");
 205 MODULE_AUTHOR("Andrew de Quincey");
 206 MODULE_LICENSE("GPL");