isl6405.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * isl6405.c - driver for dual lnb supply and control ic ISL6405
  4 *
  5 * Copyright (C) 2008 Hartmut Hackmann
  6 * Copyright (C) 2006 Oliver Endriss
  7 *
  8 * the project's page is at https://linuxtv.org
  9 */
 10#include <linux/delay.h>
 11#include <linux/errno.h>
 12#include <linux/init.h>
 13#include <linux/kernel.h>
 14#include <linux/module.h>
 15#include <linux/string.h>
 16#include <linux/slab.h>
 17
 18#include <media/dvb_frontend.h>
 19#include "isl6405.h"
 20
 21struct isl6405 {
 22	u8			config;
 23	u8			override_or;
 24	u8			override_and;
 25	struct i2c_adapter	*i2c;
 26	u8			i2c_addr;
 27};
 28
 29static int isl6405_set_voltage(struct dvb_frontend *fe,
 30			       enum fe_sec_voltage voltage)
 31{
 32	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
 33	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
 34				.buf = &isl6405->config,
 35				.len = sizeof(isl6405->config) };
 36
 37	if (isl6405->override_or & 0x80) {
 38		isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
 39		switch (voltage) {
 40		case SEC_VOLTAGE_OFF:
 41			break;
 42		case SEC_VOLTAGE_13:
 43			isl6405->config |= ISL6405_EN2;
 44			break;
 45		case SEC_VOLTAGE_18:
 46			isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
 47			break;
 48		default:
 49			return -EINVAL;
 50		}
 51	} else {
 52		isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
 53		switch (voltage) {
 54		case SEC_VOLTAGE_OFF:
 55			break;
 56		case SEC_VOLTAGE_13:
 57			isl6405->config |= ISL6405_EN1;
 58			break;
 59		case SEC_VOLTAGE_18:
 60			isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
 61			break;
 62		default:
 63			return -EINVAL;
 64		}
 65	}
 66	isl6405->config |= isl6405->override_or;
 67	isl6405->config &= isl6405->override_and;
 68
 69	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
 70}
 71
 72static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
 73{
 74	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
 75	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
 76				.buf = &isl6405->config,
 77				.len = sizeof(isl6405->config) };
 78
 79	if (isl6405->override_or & 0x80) {
 80		if (arg)
 81			isl6405->config |= ISL6405_LLC2;
 82		else
 83			isl6405->config &= ~ISL6405_LLC2;
 84	} else {
 85		if (arg)
 86			isl6405->config |= ISL6405_LLC1;
 87		else
 88			isl6405->config &= ~ISL6405_LLC1;
 89	}
 90	isl6405->config |= isl6405->override_or;
 91	isl6405->config &= isl6405->override_and;
 92
 93	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
 94}
 95
 96static void isl6405_release(struct dvb_frontend *fe)
 97{
 98	/* power off */
 99	isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
100
101	/* free */
102	kfree(fe->sec_priv);
103	fe->sec_priv = NULL;
104}
105
106struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
107				    u8 i2c_addr, u8 override_set, u8 override_clear)
108{
109	struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
110	if (!isl6405)
111		return NULL;
112
113	/* default configuration */
114	if (override_set & 0x80)
115		isl6405->config = ISL6405_ISEL2;
116	else
117		isl6405->config = ISL6405_ISEL1;
118	isl6405->i2c = i2c;
119	isl6405->i2c_addr = i2c_addr;
120	fe->sec_priv = isl6405;
121
122	/* bits which should be forced to '1' */
123	isl6405->override_or = override_set;
124
125	/* bits which should be forced to '0' */
126	isl6405->override_and = ~override_clear;
127
128	/* detect if it is present or not */
129	if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
130		kfree(isl6405);
131		fe->sec_priv = NULL;
132		return NULL;
133	}
134
135	/* install release callback */
136	fe->ops.release_sec = isl6405_release;
137
138	/* override frontend ops */
139	fe->ops.set_voltage = isl6405_set_voltage;
140	fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
141
142	return fe;
143}
144EXPORT_SYMBOL_GPL(isl6405_attach);
145
146MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
147MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
148MODULE_LICENSE("GPL");