1/*
2 * isl6421.h - driver for lnb supply and control ic ISL6421
3 *
4 * Copyright (C) 2006 Andrew de Quincey
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 "isl6421.h"
37
38struct isl6421 {
39	u8			config;
40	u8			override_or;
41	u8			override_and;
42	struct i2c_adapter	*i2c;
43	u8			i2c_addr;
44};
45
46static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
47{
48	struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
49	struct i2c_msg msg = {	.addr = isl6421->i2c_addr, .flags = 0,
50				.buf = &isl6421->config,
51				.len = sizeof(isl6421->config) };
52
53	isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
54
55	switch(voltage) {
56	case SEC_VOLTAGE_OFF:
57		break;
58	case SEC_VOLTAGE_13:
59		isl6421->config |= ISL6421_EN1;
60		break;
61	case SEC_VOLTAGE_18:
62		isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
63		break;
64	default:
65		return -EINVAL;
66	}
67
68	isl6421->config |= isl6421->override_or;
69	isl6421->config &= isl6421->override_and;
70
71	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
72}
73
74static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
75{
76	struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
77	struct i2c_msg msg = {	.addr = isl6421->i2c_addr, .flags = 0,
78				.buf = &isl6421->config,
79				.len = sizeof(isl6421->config) };
80
81	if (arg)
82		isl6421->config |= ISL6421_LLC1;
83	else
84		isl6421->config &= ~ISL6421_LLC1;
85
86	isl6421->config |= isl6421->override_or;
87	isl6421->config &= isl6421->override_and;
88
89	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
90}
91
92static int isl6421_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
93{
94	struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
95	struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
96			       .buf = &isl6421->config,
97			       .len = sizeof(isl6421->config) };
98
99	switch (tone) {
100	case SEC_TONE_ON:
101		isl6421->config |= ISL6421_ENT1;
102		break;
103	case SEC_TONE_OFF:
104		isl6421->config &= ~ISL6421_ENT1;
105		break;
106	default:
107		return -EINVAL;
108	}
109
110	isl6421->config |= isl6421->override_or;
111	isl6421->config &= isl6421->override_and;
112
113	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
114}
115
116static void isl6421_release(struct dvb_frontend *fe)
117{
118	/* power off */
119	isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
120
121	/* free */
122	kfree(fe->sec_priv);
123	fe->sec_priv = NULL;
124}
125
126struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
127		   u8 override_set, u8 override_clear, bool override_tone)
128{
129	struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
130	if (!isl6421)
131		return NULL;
132
133	/* default configuration */
134	isl6421->config = ISL6421_ISEL1;
135	isl6421->i2c = i2c;
136	isl6421->i2c_addr = i2c_addr;
137	fe->sec_priv = isl6421;
138
139	/* bits which should be forced to '1' */
140	isl6421->override_or = override_set;
141
142	/* bits which should be forced to '0' */
143	isl6421->override_and = ~override_clear;
144
145	/* detect if it is present or not */
146	if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
147		kfree(isl6421);
148		fe->sec_priv = NULL;
149		return NULL;
150	}
151
152	/* install release callback */
153	fe->ops.release_sec = isl6421_release;
154
155	/* override frontend ops */
156	fe->ops.set_voltage = isl6421_set_voltage;
157	fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
158	if (override_tone)
159		fe->ops.set_tone = isl6421_set_tone;
160
161	return fe;
162}
163EXPORT_SYMBOL(isl6421_attach);
164
165MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
166MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
167MODULE_LICENSE("GPL");
168