drivers/media/dvb-frontends/tua6100.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for Infineon tua6100 pll.
   4  *
   5  * (c) 2006 Andrew de Quincey
   6  *
   7  * Based on code found in budget-av.c, which has the following:
   8  * Compiled from various sources by Michael Hunold <michael@mihu.de>
   9  *
  10  * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> &
  11  *                               Andrew de Quincey <adq_dvb@lidskialf.net>
  12  *
  13  * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
  14  *
  15  * Copyright (C) 1999-2002 Ralph  Metzler
  16  *                       & Marcus Metzler for convergence integrated media GmbH
  17  */
  18
  19 #include <linux/slab.h>
  20 #include <linux/module.h>
  21 #include <linux/dvb/frontend.h>
  22 #include <asm/types.h>
  23
  24 #include "tua6100.h"
  25
  26 struct tua6100_priv {
  27         /* i2c details */
  28         int i2c_address;
  29         struct i2c_adapter *i2c;
  30         u32 frequency;
  31 };
  32
  33 static void tua6100_release(struct dvb_frontend *fe)
  34 {
  35         kfree(fe->tuner_priv);
  36         fe->tuner_priv = NULL;
  37 }
  38
  39 static int tua6100_sleep(struct dvb_frontend *fe)
  40 {
  41         struct tua6100_priv *priv = fe->tuner_priv;
  42         int ret;
  43         u8 reg0[] = { 0x00, 0x00 };
  44         struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
  45
  46         if (fe->ops.i2c_gate_ctrl)
  47                 fe->ops.i2c_gate_ctrl(fe, 1);
  48         if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
  49                 printk("%s: i2c error\n", __func__);
  50         }
  51         if (fe->ops.i2c_gate_ctrl)
  52                 fe->ops.i2c_gate_ctrl(fe, 0);
  53
  54         return (ret == 1) ? 0 : ret;
  55 }
  56
  57 static int tua6100_set_params(struct dvb_frontend *fe)
  58 {
  59         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  60         struct tua6100_priv *priv = fe->tuner_priv;
  61         u32 div;
  62         u32 prediv;
  63         u8 reg0[] = { 0x00, 0x00 };
  64         u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 };
  65         u8 reg2[] = { 0x02, 0x00, 0x00 };
  66         struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
  67         struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 };
  68         struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 };
  69
  70 #define _R_VAL 4
  71 #define _P_VAL 32
  72 #define _ri 4000000
  73
  74         // setup register 0
  75         if (c->frequency < 2000000)
  76                 reg0[1] = 0x03;
  77         else
  78                 reg0[1] = 0x07;
  79
  80         // setup register 1
  81         if (c->frequency < 1630000)
  82                 reg1[1] = 0x2c;
  83         else
  84                 reg1[1] = 0x0c;
  85
  86         if (_P_VAL == 64)
  87                 reg1[1] |= 0x40;
  88         if (c->frequency >= 1525000)
  89                 reg1[1] |= 0x80;
  90
  91         // register 2
  92         reg2[1] = (_R_VAL >> 8) & 0x03;
  93         reg2[2] = _R_VAL;
  94         if (c->frequency < 1455000)
  95                 reg2[1] |= 0x1c;
  96         else if (c->frequency < 1630000)
  97                 reg2[1] |= 0x0c;
  98         else
  99                 reg2[1] |= 0x1c;
 100
 101         /*
 102          * The N divisor ratio (note: c->frequency is in kHz, but we
 103          * need it in Hz)
 104          */
 105         prediv = (c->frequency * _R_VAL) / (_ri / 1000);
 106         div = prediv / _P_VAL;
 107         reg1[1] |= (div >> 9) & 0x03;
 108         reg1[2] = div >> 1;
 109         reg1[3] = (div << 7);
 110         priv->frequency = ((div * _P_VAL) * (_ri / 1000)) / _R_VAL;
 111
 112         // Finally, calculate and store the value for A
 113         reg1[3] |= (prediv - (div*_P_VAL)) & 0x7f;
 114
 115 #undef _R_VAL
 116 #undef _P_VAL
 117 #undef _ri
 118
 119         if (fe->ops.i2c_gate_ctrl)
 120                 fe->ops.i2c_gate_ctrl(fe, 1);
 121         if (i2c_transfer(priv->i2c, &msg0, 1) != 1)
 122                 return -EIO;
 123
 124         if (fe->ops.i2c_gate_ctrl)
 125                 fe->ops.i2c_gate_ctrl(fe, 1);
 126         if (i2c_transfer(priv->i2c, &msg2, 1) != 1)
 127                 return -EIO;
 128
 129         if (fe->ops.i2c_gate_ctrl)
 130                 fe->ops.i2c_gate_ctrl(fe, 1);
 131         if (i2c_transfer(priv->i2c, &msg1, 1) != 1)
 132                 return -EIO;
 133
 134         if (fe->ops.i2c_gate_ctrl)
 135                 fe->ops.i2c_gate_ctrl(fe, 0);
 136
 137         return 0;
 138 }
 139
 140 static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 141 {
 142         struct tua6100_priv *priv = fe->tuner_priv;
 143         *frequency = priv->frequency;
 144         return 0;
 145 }
 146
 147 static const struct dvb_tuner_ops tua6100_tuner_ops = {
 148         .info = {
 149                 .name = "Infineon TUA6100",
 150                 .frequency_min_hz  =  950 * MHz,
 151                 .frequency_max_hz  = 2150 * MHz,
 152                 .frequency_step_hz =    1 * MHz,
 153         },
 154         .release = tua6100_release,
 155         .sleep = tua6100_sleep,
 156         .set_params = tua6100_set_params,
 157         .get_frequency = tua6100_get_frequency,
 158 };
 159
 160 struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c)
 161 {
 162         struct tua6100_priv *priv = NULL;
 163         u8 b1 [] = { 0x80 };
 164         u8 b2 [] = { 0x00 };
 165         struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 },
 166                                   { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } };
 167         int ret;
 168
 169         if (fe->ops.i2c_gate_ctrl)
 170                 fe->ops.i2c_gate_ctrl(fe, 1);
 171         ret = i2c_transfer (i2c, msg, 2);
 172         if (fe->ops.i2c_gate_ctrl)
 173                 fe->ops.i2c_gate_ctrl(fe, 0);
 174
 175         if (ret != 2)
 176                 return NULL;
 177
 178         priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL);
 179         if (priv == NULL)
 180                 return NULL;
 181
 182         priv->i2c_address = addr;
 183         priv->i2c = i2c;
 184
 185         memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops));
 186         fe->tuner_priv = priv;
 187         return fe;
 188 }
 189 EXPORT_SYMBOL(tua6100_attach);
 190
 191 MODULE_DESCRIPTION("DVB tua6100 driver");
 192 MODULE_AUTHOR("Andrew de Quincey");
 193 MODULE_LICENSE("GPL");