V4L/DVB (9392): initial go at TDA8261 tuner
Signed-off-by: Manu Abraham <manu@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Manu Abraham
Mauro Carvalho Chehab
Родитель
43498ade8a
Коммит
00360205b9
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/*
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TDA8261 8PSK/QPSK tuner driver
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Copyright (C) Manu Abraham (abraham.manu@gmail.com)
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "dvb_frontend.h"
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#include "tda8261.h"
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struct tda8261_state {
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struct dvb_frontend *fe;
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struct i2c_adapter *i2c;
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struct tda8261_config *config;
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/* state cache */
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u32 frequency;
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u32 bandwidth;
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};
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static int tda8261_read(struct tda8261_state *state, u8 *buf)
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{
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struct tda8261_config *config = state->config;
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int err = 0;
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struct i2c_msg msg[] = {
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{ .addr = config->addr, .flags = 0, .buf = NULL, .len = 0 },
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{ .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 }
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};
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if ((err = i2c_transfer(state->i2c, msg, 2)) != 2)
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printk("%s: read error, err=%d\n", __func__, err);
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return err;
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}
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static int tda8261_write(struct tda8261_state *state, u8 *buf)
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{
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struct tda8261_config *config = state->config;
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int err = 0;
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struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
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if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
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printk("%s: read error, err=%d\n", __func__, err);
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return err;
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}
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static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
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{
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struct tda8261_state *state = fe->tuner_priv;
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u8 result = 0;
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int err = 0;
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if ((err = tda8261_read(state, &result)) < 0) {
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printk("%s: I/O Error\n", __func__);
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return err;
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}
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if ((result >> 6) & 0x01) {
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printk("%s: Tuner Phase Locked\n", __func__);
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*status = 1;
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}
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return err;
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}
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static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */
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static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
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static int tda8261_get_state(struct dvb_frontend *fe,
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enum tuner_param param,
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struct tuner_state *tstate)
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{
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struct tda8261_state *state = fe->tuner_priv;
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int err = 0;
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switch (param) {
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case DVBFE_TUNER_FREQUENCY:
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tstate->frequency = state->frequency;
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break;
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case DVBFE_TUNER_BANDWIDTH:
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tstate->bandwidth = 60000000; /* FIXME! need to calculate Bandwidth */
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break;
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default:
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printk("%s: Unknown parameter (param=%d)\n", __func__, param);
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err = -EINVAL;
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break;
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}
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return err;
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}
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static int tda8261_set_state(struct dvb_frontend *fe,
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enum tuner_param param,
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struct tuner_state *tstate)
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{
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struct tda8261_state *state = fe->tuner_priv;
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struct tda8261_config *config = state->config;
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u32 frequency, N, status = 0;
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u8 buf[4];
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int err = 0;
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if (param & DVBFE_TUNER_FREQUENCY) {
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/**
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* N = Max VCO Frequency / Channel Spacing
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* Max VCO Frequency = VCO frequency + (channel spacing - 1)
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* (to account for half channel spacing on either side)
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*/
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frequency = tstate->frequency;
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N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
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buf[0] = (N >> 8) & 0xff;
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buf[1] = N & 0xff;
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buf[2] = (0x08 << 4) | ((ref_div[config->step_size] & 0x07) << 1);
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buf[3] = 0xc0;
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/* Set params */
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printk("%s: Frequency=%d, Sending[ %02x %02x %02x %02x ]\n",
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__func__, frequency, buf[0], buf[1], buf[2], buf[3]);
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if ((err = tda8261_write(state, buf)) < 0) {
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printk("%s: I/O Error\n", __func__);
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return err;
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}
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/* sleep for some time */
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msleep(100);
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/* check status */
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if ((err = tda8261_get_status(fe, &status)) < 0) {
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printk("%s: I/O Error\n", __func__);
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return err;
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}
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if (status == 1)
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printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
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else
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printk("%s: No Phase lock: status=%d\n", __func__, status);
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} else {
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printk("%s: Unknown parameter (param=%d)\n", __func__, param);
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return -EINVAL;
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}
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return 0;
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}
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static int tda8261_release(struct dvb_frontend *fe)
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{
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struct tda8261_state *state = fe->tuner_priv;
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fe->tuner_priv = NULL;
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kfree(state);
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return 0;
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}
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static struct dvb_tuner_ops tda8261_ops = {
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.info = {
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.name = "TDA8261",
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// .tuner_name = NULL,
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.frequency_min = 950000,
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.frequency_max = 2150000,
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.frequency_step = 0
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},
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.set_state = tda8261_set_state,
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.get_state = tda8261_get_state,
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.release = tda8261_release
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};
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struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
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struct tda8261_config *config,
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struct i2c_adapter *i2c)
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{
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struct tda8261_state *state = NULL;
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if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
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goto exit;
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state->config = config;
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state->i2c = i2c;
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state->fe = fe;
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fe->tuner_priv = state;
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fe->ops.tuner_ops = tda8261_ops;
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fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size];
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// fe->ops.tuner_ops.tuner_name = &config->buf;
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// printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n",
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// __func__, fe->ops.tuner_ops.tuner_name);
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printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
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return fe;
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exit:
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kfree(state);
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return NULL;
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}
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EXPORT_SYMBOL(tda8261_attach);
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MODULE_PARM_DESC(verbose, "Set verbosity level");
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MODULE_AUTHOR("Manu Abraham");
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MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,25 @@
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#ifndef __TDA8261_H
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#define __TDA8261_H
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enum tda8261_step {
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TDA8261_STEP_2000 = 0, /* 2000 kHz */
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TDA8261_STEP_1000, /* 1000 kHz */
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TDA8261_STEP_500, /* 500 kHz */
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TDA8261_STEP_250, /* 250 kHz */
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TDA8261_STEP_125 /* 125 kHz */
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};
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struct tda8261_config {
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// u8 buf[16];
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u8 addr;
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enum tda8261_step step_size;
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};
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/* move out from here! */
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static const struct tda8261_config sd1878c_config = {
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// .name = "SD1878C",
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.addr = 0x60,
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.step_size = TDA8261_STEP_1000 /* kHz */
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};
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#endif// __TDA8261_H
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