linux/drivers/media/dvb-frontends/isl6421.c
Thomas Gleixner a0c7056fda treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 113
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 to
  obtain the license point your browser to http www gnu org copyleft
  gpl html

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 26 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190523091650.572604764@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:39:01 +02:00

221 lines
5.1 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* isl6421.h - driver for lnb supply and control ic ISL6421
*
* Copyright (C) 2006 Andrew de Quincey
* Copyright (C) 2006 Oliver Endriss
*
* the project's page is at https://linuxtv.org
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "isl6421.h"
struct isl6421 {
u8 config;
u8 override_or;
u8 override_and;
struct i2c_adapter *i2c;
u8 i2c_addr;
bool is_off;
};
static int isl6421_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage voltage)
{
int ret;
u8 buf;
bool is_off;
struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
struct i2c_msg msg[2] = {
{
.addr = isl6421->i2c_addr,
.flags = 0,
.buf = &isl6421->config,
.len = 1,
}, {
.addr = isl6421->i2c_addr,
.flags = I2C_M_RD,
.buf = &buf,
.len = 1,
}
};
isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
switch(voltage) {
case SEC_VOLTAGE_OFF:
is_off = true;
break;
case SEC_VOLTAGE_13:
is_off = false;
isl6421->config |= ISL6421_EN1;
break;
case SEC_VOLTAGE_18:
is_off = false;
isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
break;
default:
return -EINVAL;
}
/*
* If LNBf were not powered on, disable dynamic current limit, as,
* according with datasheet, highly capacitive load on the output may
* cause a difficult start-up.
*/
if (isl6421->is_off && !is_off)
isl6421->config |= ISL6421_DCL;
isl6421->config |= isl6421->override_or;
isl6421->config &= isl6421->override_and;
ret = i2c_transfer(isl6421->i2c, msg, 2);
if (ret < 0)
return ret;
if (ret != 2)
return -EIO;
/* Store off status now in case future commands fail */
isl6421->is_off = is_off;
/* On overflow, the device will try again after 900 ms (typically) */
if (!is_off && (buf & ISL6421_OLF1))
msleep(1000);
/* Re-enable dynamic current limit */
if ((isl6421->config & ISL6421_DCL) &&
!(isl6421->override_or & ISL6421_DCL)) {
isl6421->config &= ~ISL6421_DCL;
ret = i2c_transfer(isl6421->i2c, msg, 2);
if (ret < 0)
return ret;
if (ret != 2)
return -EIO;
}
/* Check if overload flag is active. If so, disable power */
if (!is_off && (buf & ISL6421_OLF1)) {
isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
ret = i2c_transfer(isl6421->i2c, msg, 1);
if (ret < 0)
return ret;
if (ret != 1)
return -EIO;
isl6421->is_off = true;
dev_warn(&isl6421->i2c->dev,
"Overload current detected. disabling LNBf power\n");
return -EINVAL;
}
return 0;
}
static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
.buf = &isl6421->config,
.len = sizeof(isl6421->config) };
if (arg)
isl6421->config |= ISL6421_LLC1;
else
isl6421->config &= ~ISL6421_LLC1;
isl6421->config |= isl6421->override_or;
isl6421->config &= isl6421->override_and;
return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}
static int isl6421_set_tone(struct dvb_frontend *fe,
enum fe_sec_tone_mode tone)
{
struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
.buf = &isl6421->config,
.len = sizeof(isl6421->config) };
switch (tone) {
case SEC_TONE_ON:
isl6421->config |= ISL6421_ENT1;
break;
case SEC_TONE_OFF:
isl6421->config &= ~ISL6421_ENT1;
break;
default:
return -EINVAL;
}
isl6421->config |= isl6421->override_or;
isl6421->config &= isl6421->override_and;
return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}
static void isl6421_release(struct dvb_frontend *fe)
{
/* power off */
isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
/* free */
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
u8 override_set, u8 override_clear, bool override_tone)
{
struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
if (!isl6421)
return NULL;
/* default configuration */
isl6421->config = ISL6421_ISEL1;
isl6421->i2c = i2c;
isl6421->i2c_addr = i2c_addr;
fe->sec_priv = isl6421;
/* bits which should be forced to '1' */
isl6421->override_or = override_set;
/* bits which should be forced to '0' */
isl6421->override_and = ~override_clear;
/* detect if it is present or not */
if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
kfree(isl6421);
fe->sec_priv = NULL;
return NULL;
}
isl6421->is_off = true;
/* install release callback */
fe->ops.release_sec = isl6421_release;
/* override frontend ops */
fe->ops.set_voltage = isl6421_set_voltage;
fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
if (override_tone)
fe->ops.set_tone = isl6421_set_tone;
return fe;
}
EXPORT_SYMBOL(isl6421_attach);
MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
MODULE_LICENSE("GPL");