linux/drivers/media/dvb-frontends/tda826x.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

175 lines
4.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
Driver for Philips tda8262/tda8263 DVBS Silicon tuners
(c) 2006 Andrew de Quincey
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dvb/frontend.h>
#include <asm/types.h>
#include "tda826x.h"
static int debug;
#define dprintk(args...) \
do { \
if (debug) printk(KERN_DEBUG "tda826x: " args); \
} while (0)
struct tda826x_priv {
/* i2c details */
int i2c_address;
struct i2c_adapter *i2c;
u8 has_loopthrough:1;
u32 frequency;
};
static void tda826x_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
}
static int tda826x_sleep(struct dvb_frontend *fe)
{
struct tda826x_priv *priv = fe->tuner_priv;
int ret;
u8 buf [] = { 0x00, 0x8d };
struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };
dprintk("%s:\n", __func__);
if (!priv->has_loopthrough)
buf[1] = 0xad;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
dprintk("%s: i2c error\n", __func__);
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return (ret == 1) ? 0 : ret;
}
static int tda826x_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct tda826x_priv *priv = fe->tuner_priv;
int ret;
u32 div;
u32 ksyms;
u32 bandwidth;
u8 buf [11];
struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
dprintk("%s:\n", __func__);
div = (p->frequency + (1000-1)) / 1000;
/* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */
/* with R0 = 0.35 and some transformations: */
ksyms = p->symbol_rate / 1000;
bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
if (bandwidth < 5)
bandwidth = 5;
else if (bandwidth > 36)
bandwidth = 36;
buf[0] = 0x00; // subaddress
buf[1] = 0x09; // powerdown RSSI + the magic value 1
if (!priv->has_loopthrough)
buf[1] |= 0x20; // power down loopthrough if not needed
buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
buf[3] = div >> 7;
buf[4] = div << 1;
buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
buf[7] = 0x83; // charge pumps at high, tests off
buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
dprintk("%s: i2c error\n", __func__);
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
priv->frequency = div * 1000;
return (ret == 1) ? 0 : ret;
}
static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct tda826x_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static const struct dvb_tuner_ops tda826x_tuner_ops = {
.info = {
.name = "Philips TDA826X",
.frequency_min_hz = 950 * MHz,
.frequency_max_hz = 2175 * MHz
},
.release = tda826x_release,
.sleep = tda826x_sleep,
.set_params = tda826x_set_params,
.get_frequency = tda826x_get_frequency,
};
struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
{
struct tda826x_priv *priv = NULL;
u8 b1 [] = { 0, 0 };
struct i2c_msg msg[2] = {
{ .addr = addr, .flags = 0, .buf = NULL, .len = 0 },
{ .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
};
int ret;
dprintk("%s:\n", __func__);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
ret = i2c_transfer (i2c, msg, 2);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
if (ret != 2)
return NULL;
if (!(b1[1] & 0x80))
return NULL;
priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->i2c_address = addr;
priv->i2c = i2c;
priv->has_loopthrough = has_loopthrough;
memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
return fe;
}
EXPORT_SYMBOL(tda826x_attach);
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("DVB TDA826x driver");
MODULE_AUTHOR("Andrew de Quincey");
MODULE_LICENSE("GPL");