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");
149