tua6100.c (4781B)
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 26struct tua6100_priv { 27 /* i2c details */ 28 int i2c_address; 29 struct i2c_adapter *i2c; 30 u32 frequency; 31}; 32 33static void tua6100_release(struct dvb_frontend *fe) 34{ 35 kfree(fe->tuner_priv); 36 fe->tuner_priv = NULL; 37} 38 39static 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 57static 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 140static 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 147static 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 160struct 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} 189EXPORT_SYMBOL(tua6100_attach); 190 191MODULE_DESCRIPTION("DVB tua6100 driver"); 192MODULE_AUTHOR("Andrew de Quincey"); 193MODULE_LICENSE("GPL");