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https://github.com/edk2-porting/linux-next.git
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114323ede9
Attached is a patch which fixes tuning to low frequency channels with stb0899+tda8261 cards like the KNC TV-Station DVB-S2. The cause of the issue was a broken if construct, which should have been an if/else if, so that the setting for the lowest matching frequency is applied. Without this patch for example tuning to "arte" on Astra 19.2, 10744MHz SR22000 failed most times and when it failed the communication between driver and tda8261 was completely broken. This problem disappears with the attached patch. Signed-off-by: Julian Scheel <julian@jusst.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
231 lines
5.9 KiB
C
231 lines
5.9 KiB
C
/*
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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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const 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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const 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 = I2C_M_RD,.buf = buf, .len = 2 };
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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_write(struct tda8261_state *state, u8 *buf)
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{
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const 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: write 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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*status = 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 = 40000000; /* 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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const 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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if ((frequency < 950000) || (frequency > 2150000)) {
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printk("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
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return -EINVAL;
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}
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N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
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printk("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
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__func__, config->step_size, div_tab[config->step_size], N, N);
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buf[0] = (N >> 8) & 0xff;
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buf[1] = N & 0xff;
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buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
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if (frequency < 1450000)
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buf[3] = 0x00;
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else if (frequency < 2000000)
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buf[3] = 0x40;
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else if (frequency < 2150000)
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buf[3] = 0x80;
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/* Set params */
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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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printk("%s: Waiting to Phase LOCK\n", __func__);
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msleep(20);
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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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state->frequency = frequency; /* cache successful state */
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} else {
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printk("%s: No Phase lock: status=%d\n", __func__, status);
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}
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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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.get_status = tda8261_get_status,
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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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const 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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