tda8261.c revision 41e1151b33cce7e19cfba1648d05abd34a0ba492
1/* 2 TDA8261 8PSK/QPSK tuner driver 3 Copyright (C) Manu Abraham (abraham.manu@gmail.com) 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18*/ 19 20 21#include <linux/init.h> 22#include <linux/kernel.h> 23#include <linux/module.h> 24 25#include "dvb_frontend.h" 26#include "tda8261.h" 27 28struct tda8261_state { 29 struct dvb_frontend *fe; 30 struct i2c_adapter *i2c; 31 const struct tda8261_config *config; 32 33 /* state cache */ 34 u32 frequency; 35 u32 bandwidth; 36}; 37 38static int tda8261_read(struct tda8261_state *state, u8 *buf) 39{ 40 const struct tda8261_config *config = state->config; 41 int err = 0; 42 struct i2c_msg msg[] = { 43 { .addr = config->addr, .flags = 0, .buf = NULL, .len = 0 }, 44 { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 } 45 }; 46 47 if ((err = i2c_transfer(state->i2c, msg, 2)) != 2) 48 printk("%s: read error, err=%d\n", __func__, err); 49 50 return err; 51} 52 53static int tda8261_write(struct tda8261_state *state, u8 *buf) 54{ 55 const struct tda8261_config *config = state->config; 56 int err = 0; 57 struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 }; 58 59 if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) 60 printk("%s: read error, err=%d\n", __func__, err); 61 62 return err; 63} 64 65static int tda8261_get_status(struct dvb_frontend *fe, u32 *status) 66{ 67 struct tda8261_state *state = fe->tuner_priv; 68 u8 result = 0; 69 int err = 0; 70 71 if ((err = tda8261_read(state, &result)) < 0) { 72 printk("%s: I/O Error\n", __func__); 73 return err; 74 } 75 if ((result >> 6) & 0x01) { 76 printk("%s: Tuner Phase Locked\n", __func__); 77 *status = 1; 78 } 79 80 return err; 81} 82 83static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */ 84static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 }; 85 86static int tda8261_get_state(struct dvb_frontend *fe, 87 enum tuner_param param, 88 struct tuner_state *tstate) 89{ 90 struct tda8261_state *state = fe->tuner_priv; 91 int err = 0; 92 93 switch (param) { 94 case DVBFE_TUNER_FREQUENCY: 95 tstate->frequency = state->frequency; 96 break; 97 case DVBFE_TUNER_BANDWIDTH: 98 tstate->bandwidth = 60000000; /* FIXME! need to calculate Bandwidth */ 99 break; 100 default: 101 printk("%s: Unknown parameter (param=%d)\n", __func__, param); 102 err = -EINVAL; 103 break; 104 } 105 106 return err; 107} 108 109static int tda8261_set_state(struct dvb_frontend *fe, 110 enum tuner_param param, 111 struct tuner_state *tstate) 112{ 113 struct tda8261_state *state = fe->tuner_priv; 114 const struct tda8261_config *config = state->config; 115 u32 frequency, N, status = 0; 116 u8 buf[4]; 117 int err = 0; 118 119 if (param & DVBFE_TUNER_FREQUENCY) { 120 /** 121 * N = Max VCO Frequency / Channel Spacing 122 * Max VCO Frequency = VCO frequency + (channel spacing - 1) 123 * (to account for half channel spacing on either side) 124 */ 125 frequency = tstate->frequency; 126 N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size]; 127 buf[0] = (N >> 8) & 0xff; 128 buf[1] = N & 0xff; 129 buf[2] = (0x08 << 4) | ((ref_div[config->step_size] & 0x07) << 1); 130 buf[3] = 0xc0; 131 /* Set params */ 132 printk("%s: Frequency=%d, Sending[ %02x %02x %02x %02x ]\n", 133 __func__, frequency, buf[0], buf[1], buf[2], buf[3]); 134 135 if ((err = tda8261_write(state, buf)) < 0) { 136 printk("%s: I/O Error\n", __func__); 137 return err; 138 } 139 /* sleep for some time */ 140 msleep(100); 141 /* check status */ 142 if ((err = tda8261_get_status(fe, &status)) < 0) { 143 printk("%s: I/O Error\n", __func__); 144 return err; 145 } 146 if (status == 1) { 147 printk("%s: Tuner Phase locked: status=%d\n", __func__, status); 148 state->frequency = frequency; /* cache last successful */ 149 } else { 150 printk("%s: No Phase lock: status=%d\n", __func__, status); 151 } 152 } else { 153 printk("%s: Unknown parameter (param=%d)\n", __func__, param); 154 return -EINVAL; 155 } 156 157 return 0; 158} 159 160static int tda8261_release(struct dvb_frontend *fe) 161{ 162 struct tda8261_state *state = fe->tuner_priv; 163 164 fe->tuner_priv = NULL; 165 kfree(state); 166 return 0; 167} 168 169static struct dvb_tuner_ops tda8261_ops = { 170 171 .info = { 172 .name = "TDA8261", 173// .tuner_name = NULL, 174 .frequency_min = 950000, 175 .frequency_max = 2150000, 176 .frequency_step = 0 177 }, 178 179 .set_state = tda8261_set_state, 180 .get_state = tda8261_get_state, 181 .release = tda8261_release 182}; 183 184struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe, 185 const struct tda8261_config *config, 186 struct i2c_adapter *i2c) 187{ 188 struct tda8261_state *state = NULL; 189 190 if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL) 191 goto exit; 192 193 state->config = config; 194 state->i2c = i2c; 195 state->fe = fe; 196 fe->tuner_priv = state; 197 fe->ops.tuner_ops = tda8261_ops; 198 199 fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size]; 200// fe->ops.tuner_ops.tuner_name = &config->buf; 201 202// printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n", 203// __func__, fe->ops.tuner_ops.tuner_name); 204 printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__); 205 206 207 return fe; 208 209exit: 210 kfree(state); 211 return NULL; 212} 213 214EXPORT_SYMBOL(tda8261_attach); 215MODULE_PARM_DESC(verbose, "Set verbosity level"); 216 217MODULE_AUTHOR("Manu Abraham"); 218MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner"); 219MODULE_LICENSE("GPL"); 220