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linux-next/drivers/media/dvb-frontends/tda8261.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  675 mass ave cambridge ma 02139 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 441 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:36:45 +02:00

196 lines
4.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
TDA8261 8PSK/QPSK tuner driver
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "tda8261.h"
struct tda8261_state {
struct dvb_frontend *fe;
struct i2c_adapter *i2c;
const struct tda8261_config *config;
/* state cache */
u32 frequency;
u32 bandwidth;
};
static int tda8261_read(struct tda8261_state *state, u8 *buf)
{
const struct tda8261_config *config = state->config;
int err = 0;
struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 };
if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
pr_err("%s: read error, err=%d\n", __func__, err);
return err;
}
static int tda8261_write(struct tda8261_state *state, u8 *buf)
{
const struct tda8261_config *config = state->config;
int err = 0;
struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
pr_err("%s: write error, err=%d\n", __func__, err);
return err;
}
static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
{
struct tda8261_state *state = fe->tuner_priv;
u8 result = 0;
int err = 0;
*status = 0;
if ((err = tda8261_read(state, &result)) < 0) {
pr_err("%s: I/O Error\n", __func__);
return err;
}
if ((result >> 6) & 0x01) {
pr_debug("%s: Tuner Phase Locked\n", __func__);
*status = 1;
}
return err;
}
static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */
static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
static int tda8261_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct tda8261_state *state = fe->tuner_priv;
*frequency = state->frequency;
return 0;
}
static int tda8261_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct tda8261_state *state = fe->tuner_priv;
const struct tda8261_config *config = state->config;
u32 frequency, N, status = 0;
u8 buf[4];
int err = 0;
/*
* N = Max VCO Frequency / Channel Spacing
* Max VCO Frequency = VCO frequency + (channel spacing - 1)
* (to account for half channel spacing on either side)
*/
frequency = c->frequency;
if ((frequency < 950000) || (frequency > 2150000)) {
pr_warn("%s: Frequency beyond limits, frequency=%d\n",
__func__, frequency);
return -EINVAL;
}
N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
pr_debug("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
__func__, config->step_size, div_tab[config->step_size], N, N);
buf[0] = (N >> 8) & 0xff;
buf[1] = N & 0xff;
buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
if (frequency < 1450000)
buf[3] = 0x00;
else if (frequency < 2000000)
buf[3] = 0x40;
else if (frequency < 2150000)
buf[3] = 0x80;
/* Set params */
err = tda8261_write(state, buf);
if (err < 0) {
pr_err("%s: I/O Error\n", __func__);
return err;
}
/* sleep for some time */
pr_debug("%s: Waiting to Phase LOCK\n", __func__);
msleep(20);
/* check status */
if ((err = tda8261_get_status(fe, &status)) < 0) {
pr_err("%s: I/O Error\n", __func__);
return err;
}
if (status == 1) {
pr_debug("%s: Tuner Phase locked: status=%d\n", __func__,
status);
state->frequency = frequency; /* cache successful state */
} else {
pr_debug("%s: No Phase lock: status=%d\n", __func__, status);
}
return 0;
}
static void tda8261_release(struct dvb_frontend *fe)
{
struct tda8261_state *state = fe->tuner_priv;
fe->tuner_priv = NULL;
kfree(state);
}
static const struct dvb_tuner_ops tda8261_ops = {
.info = {
.name = "TDA8261",
.frequency_min_hz = 950 * MHz,
.frequency_max_hz = 2150 * MHz,
},
.set_params = tda8261_set_params,
.get_frequency = tda8261_get_frequency,
.get_status = tda8261_get_status,
.release = tda8261_release
};
struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
const struct tda8261_config *config,
struct i2c_adapter *i2c)
{
struct tda8261_state *state = NULL;
if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
goto exit;
state->config = config;
state->i2c = i2c;
state->fe = fe;
fe->tuner_priv = state;
fe->ops.tuner_ops = tda8261_ops;
fe->ops.tuner_ops.info.frequency_step_hz = div_tab[config->step_size] * kHz;
pr_info("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
return fe;
exit:
kfree(state);
return NULL;
}
EXPORT_SYMBOL(tda8261_attach);
MODULE_AUTHOR("Manu Abraham");
MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
MODULE_LICENSE("GPL");