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![Mauro Carvalho Chehab](/assets/img/avatar_default.png)
Right now, satellite tuner drivers specify frequencies in kHz, while terrestrial/cable ones specify in Hz. That's confusing for developers. However, the main problem is that universal tuners capable of handling both satellite and non-satelite delivery systems are appearing. We end by needing to hack the drivers in order to support such hybrid tuners. So, convert everything to specify tuner frequencies in Hz. Plese notice that a similar patch is also needed for frontends. Tested-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com> Acked-by: Michael Büsch <m@bues.ch> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
207 lines
5.2 KiB
C
207 lines
5.2 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 <linux/slab.h>
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#include <media/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 = 1 };
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if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
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pr_err("%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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pr_err("%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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pr_err("%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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pr_debug("%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_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct tda8261_state *state = fe->tuner_priv;
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*frequency = state->frequency;
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return 0;
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}
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static int tda8261_set_params(struct dvb_frontend *fe)
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{
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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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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/*
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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 = c->frequency;
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if ((frequency < 950000) || (frequency > 2150000)) {
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pr_warn("%s: Frequency beyond limits, frequency=%d\n",
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__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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pr_debug("%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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err = tda8261_write(state, buf);
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if (err < 0) {
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pr_err("%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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pr_debug("%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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pr_err("%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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pr_debug("%s: Tuner Phase locked: status=%d\n", __func__,
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status);
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state->frequency = frequency; /* cache successful state */
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} else {
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pr_debug("%s: No Phase lock: status=%d\n", __func__, status);
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}
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return 0;
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}
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static void 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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}
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static const struct dvb_tuner_ops tda8261_ops = {
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.info = {
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.name = "TDA8261",
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.frequency_min_hz = 950 * MHz,
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.frequency_max_hz = 2150 * MHz,
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},
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.set_params = tda8261_set_params,
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.get_frequency = tda8261_get_frequency,
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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_hz = div_tab[config->step_size] * kHz;
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pr_info("%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_AUTHOR("Manu Abraham");
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MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
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MODULE_LICENSE("GPL");
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