Orange Pi5 kernel

// 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");