Commit 1b09dd9f authored by Katsuhiro Suzuki's avatar Katsuhiro Suzuki Committed by Mauro Carvalho Chehab

media: dvb-frontends: add LNBH29 LNB supply driver

Add support for STMicroelectronics LNBH29 LNB supply driver.
Signed-off-by: default avatarKatsuhiro Suzuki <suzuki.katsuhiro@socionext.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent 447d6685
......@@ -791,6 +791,16 @@ config DVB_LNBH25
An SEC control chip.
Say Y when you want to support this chip.
config DVB_LNBH29
tristate "LNBH29 SEC controller"
depends on DVB_CORE && I2C
default m if !MEDIA_SUBDRV_AUTOSELECT
help
LNB power supply and control voltage
regulator chip with step-up converter
and I2C interface for STMicroelectronics LNBH29.
Say Y when you want to support this chip.
config DVB_LNBP21
tristate "LNBP21/LNBH24 SEC controllers"
depends on DVB_CORE && I2C
......
......@@ -58,6 +58,7 @@ obj-$(CONFIG_DVB_LGDT3306A) += lgdt3306a.o
obj-$(CONFIG_DVB_LG2160) += lg2160.o
obj-$(CONFIG_DVB_CX24123) += cx24123.o
obj-$(CONFIG_DVB_LNBH25) += lnbh25.o
obj-$(CONFIG_DVB_LNBH29) += lnbh29.o
obj-$(CONFIG_DVB_LNBP21) += lnbp21.o
obj-$(CONFIG_DVB_LNBP22) += lnbp22.o
obj-$(CONFIG_DVB_ISL6405) += isl6405.o
......
// SPDX-License-Identifier: GPL-2.0
//
// Driver for LNB supply and control IC STMicroelectronics LNBH29
//
// Copyright (c) 2018 Socionext Inc.
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "lnbh29.h"
/**
* struct lnbh29_priv - LNBH29 driver private data
* @i2c: Pointer to the I2C adapter structure
* @i2c_address: I2C address of LNBH29 chip
* @config: Registers configuration
* offset 0: 1st register address, always 0x01 (DATA)
* offset 1: DATA register value
*/
struct lnbh29_priv {
struct i2c_adapter *i2c;
u8 i2c_address;
u8 config[2];
};
#define LNBH29_STATUS_OLF BIT(0)
#define LNBH29_STATUS_OTF BIT(1)
#define LNBH29_STATUS_VMON BIT(2)
#define LNBH29_STATUS_PNG BIT(3)
#define LNBH29_STATUS_PDO BIT(4)
#define LNBH29_VSEL_MASK GENMASK(2, 0)
#define LNBH29_VSEL_0 0x00
/* Min: 13.188V, Typ: 13.667V, Max:14V */
#define LNBH29_VSEL_13 0x03
/* Min: 18.158V, Typ: 18.817V, Max:19.475V */
#define LNBH29_VSEL_18 0x07
static int lnbh29_read_vmon(struct lnbh29_priv *priv)
{
u8 addr = 0x00;
u8 status[2];
int ret;
struct i2c_msg msg[2] = {
{
.addr = priv->i2c_address,
.flags = 0,
.len = 1,
.buf = &addr
}, {
.addr = priv->i2c_address,
.flags = I2C_M_RD,
.len = sizeof(status),
.buf = status
}
};
ret = i2c_transfer(priv->i2c, msg, 2);
if (ret >= 0 && ret != 2)
ret = -EIO;
if (ret < 0) {
dev_dbg(&priv->i2c->dev, "LNBH29 I2C transfer failed (%d)\n",
ret);
return ret;
}
if (status[0] & (LNBH29_STATUS_OLF | LNBH29_STATUS_VMON)) {
dev_err(&priv->i2c->dev,
"LNBH29 voltage in failure state, status reg 0x%x\n",
status[0]);
return -EIO;
}
return 0;
}
static int lnbh29_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage voltage)
{
struct lnbh29_priv *priv = fe->sec_priv;
u8 data_reg;
int ret;
struct i2c_msg msg = {
.addr = priv->i2c_address,
.flags = 0,
.len = sizeof(priv->config),
.buf = priv->config
};
switch (voltage) {
case SEC_VOLTAGE_OFF:
data_reg = LNBH29_VSEL_0;
break;
case SEC_VOLTAGE_13:
data_reg = LNBH29_VSEL_13;
break;
case SEC_VOLTAGE_18:
data_reg = LNBH29_VSEL_18;
break;
default:
return -EINVAL;
}
priv->config[1] &= ~LNBH29_VSEL_MASK;
priv->config[1] |= data_reg;
ret = i2c_transfer(priv->i2c, &msg, 1);
if (ret >= 0 && ret != 1)
ret = -EIO;
if (ret < 0) {
dev_err(&priv->i2c->dev, "LNBH29 I2C transfer error (%d)\n",
ret);
return ret;
}
/* Soft-start time (Vout 0V to 18V) is Typ. 6ms. */
usleep_range(6000, 20000);
if (voltage == SEC_VOLTAGE_OFF)
return 0;
return lnbh29_read_vmon(priv);
}
static void lnbh29_release(struct dvb_frontend *fe)
{
lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF);
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
struct lnbh29_config *cfg,
struct i2c_adapter *i2c)
{
struct lnbh29_priv *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return NULL;
priv->i2c_address = (cfg->i2c_address >> 1);
priv->i2c = i2c;
priv->config[0] = 0x01;
priv->config[1] = cfg->data_config;
fe->sec_priv = priv;
if (lnbh29_set_voltage(fe, SEC_VOLTAGE_OFF)) {
dev_err(&i2c->dev, "no LNBH29 found at I2C addr 0x%02x\n",
priv->i2c_address);
kfree(priv);
fe->sec_priv = NULL;
return NULL;
}
fe->ops.release_sec = lnbh29_release;
fe->ops.set_voltage = lnbh29_set_voltage;
dev_info(&i2c->dev, "LNBH29 attached at I2C addr 0x%02x\n",
priv->i2c_address);
return fe;
}
EXPORT_SYMBOL(lnbh29_attach);
MODULE_AUTHOR("Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>");
MODULE_DESCRIPTION("STMicroelectronics LNBH29 driver");
MODULE_LICENSE("GPL v2");
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for LNB supply and control IC STMicroelectronics LNBH29
*
* Copyright (c) 2018 Socionext Inc.
*/
#ifndef LNBH29_H
#define LNBH29_H
#include <linux/i2c.h>
#include <linux/dvb/frontend.h>
/* Using very low E.S.R. capacitors or ceramic caps */
#define LNBH29_DATA_COMP BIT(3)
struct lnbh29_config {
u8 i2c_address;
u8 data_config;
};
#if IS_REACHABLE(CONFIG_DVB_LNBH29)
struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
struct lnbh29_config *cfg,
struct i2c_adapter *i2c);
#else
static inline struct dvb_frontend *lnbh29_attach(struct dvb_frontend *fe,
struct lnbh29_config *cfg,
struct i2c_adapter *i2c)
{
printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif
#endif
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment