1/*
2 * isl6405.c - driver for dual lnb supply and control ic ISL6405
3 *
4 * Copyright (C) 2008 Hartmut Hackmann
5 * Copyright (C) 2006 Oliver Endriss
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
23 *
24 *
25 * the project's page is at http://www.linuxtv.org
26 */
27#include <linux/delay.h>
28#include <linux/errno.h>
29#include <linux/init.h>
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/string.h>
33#include <linux/slab.h>
34
35#include "dvb_frontend.h"
36#include "isl6405.h"
37
38struct isl6405 {
39	u8			config;
40	u8			override_or;
41	u8			override_and;
42	struct i2c_adapter	*i2c;
43	u8			i2c_addr;
44};
45
46static int isl6405_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
47{
48	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
49	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
50				.buf = &isl6405->config,
51				.len = sizeof(isl6405->config) };
52
53	if (isl6405->override_or & 0x80) {
54		isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
55		switch (voltage) {
56		case SEC_VOLTAGE_OFF:
57			break;
58		case SEC_VOLTAGE_13:
59			isl6405->config |= ISL6405_EN2;
60			break;
61		case SEC_VOLTAGE_18:
62			isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
63			break;
64		default:
65			return -EINVAL;
66		}
67	} else {
68		isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
69		switch (voltage) {
70		case SEC_VOLTAGE_OFF:
71			break;
72		case SEC_VOLTAGE_13:
73			isl6405->config |= ISL6405_EN1;
74			break;
75		case SEC_VOLTAGE_18:
76			isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
77			break;
78		default:
79			return -EINVAL;
80		}
81	}
82	isl6405->config |= isl6405->override_or;
83	isl6405->config &= isl6405->override_and;
84
85	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
86}
87
88static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
89{
90	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
91	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
92				.buf = &isl6405->config,
93				.len = sizeof(isl6405->config) };
94
95	if (isl6405->override_or & 0x80) {
96		if (arg)
97			isl6405->config |= ISL6405_LLC2;
98		else
99			isl6405->config &= ~ISL6405_LLC2;
100	} else {
101		if (arg)
102			isl6405->config |= ISL6405_LLC1;
103		else
104			isl6405->config &= ~ISL6405_LLC1;
105	}
106	isl6405->config |= isl6405->override_or;
107	isl6405->config &= isl6405->override_and;
108
109	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
110}
111
112static void isl6405_release(struct dvb_frontend *fe)
113{
114	/* power off */
115	isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
116
117	/* free */
118	kfree(fe->sec_priv);
119	fe->sec_priv = NULL;
120}
121
122struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
123				    u8 i2c_addr, u8 override_set, u8 override_clear)
124{
125	struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
126	if (!isl6405)
127		return NULL;
128
129	/* default configuration */
130	if (override_set & 0x80)
131		isl6405->config = ISL6405_ISEL2;
132	else
133		isl6405->config = ISL6405_ISEL1;
134	isl6405->i2c = i2c;
135	isl6405->i2c_addr = i2c_addr;
136	fe->sec_priv = isl6405;
137
138	/* bits which should be forced to '1' */
139	isl6405->override_or = override_set;
140
141	/* bits which should be forced to '0' */
142	isl6405->override_and = ~override_clear;
143
144	/* detect if it is present or not */
145	if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
146		kfree(isl6405);
147		fe->sec_priv = NULL;
148		return NULL;
149	}
150
151	/* install release callback */
152	fe->ops.release_sec = isl6405_release;
153
154	/* override frontend ops */
155	fe->ops.set_voltage = isl6405_set_voltage;
156	fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
157
158	return fe;
159}
160EXPORT_SYMBOL(isl6405_attach);
161
162MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
163MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
164MODULE_LICENSE("GPL");
165