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gerrit-public.fairphone.software / kernel / msm-4.9 / 8a411bad39fb91e212f09ce99a642c7e7bb95325 / . / drivers / media / dvb / frontends / isl6405.c
blob: 33d33f4d8867a409d15e32bbc4d45991efdd14c9 [file] [log] [blame]
Hartmut Hackmann4b1431c2008-04-22 14:42:09 -0300[diff] [blame]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");