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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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/moduleparam.h>
33#include <linux/string.h>
34#include <linux/slab.h>
35
36#include "dvb_frontend.h"
37#include "isl6421.h"
38
39struct isl6421 {
40 u8 config;
41 u8 override_or;
42 u8 override_and;
43 struct i2c_adapter *i2c;
44 u8 i2c_addr;
45};
46
47static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
48{
49 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
50 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
51 .buf = &isl6421->config,
52 .len = sizeof(isl6421->config) };
53
54 isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
55
56 switch(voltage) {
57 case SEC_VOLTAGE_OFF:
58 break;
59 case SEC_VOLTAGE_13:
60 isl6421->config |= ISL6421_EN1;
61 break;
62 case SEC_VOLTAGE_18:
63 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
64 break;
65 default:
66 return -EINVAL;
67 };
68
69 isl6421->config |= isl6421->override_or;
70 isl6421->config &= isl6421->override_and;
71
72 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
73}
74
75static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
76{
77 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
78 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
79 .buf = &isl6421->config,
80 .len = sizeof(isl6421->config) };
81
82 if (arg)
83 isl6421->config |= ISL6421_LLC1;
84 else
85 isl6421->config &= ~ISL6421_LLC1;
86
87 isl6421->config |= isl6421->override_or;
88 isl6421->config &= isl6421->override_and;
89
90 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
91}
92
93static void isl6421_release(struct dvb_frontend *fe)
94{
95 /* power off */
96 isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
97
98 /* free */
99 kfree(fe->sec_priv);
100 fe->sec_priv = NULL;
101}
102
103struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
104 u8 override_set, u8 override_clear)
105{
106 struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
107 if (!isl6421)
108 return NULL;
109
110 /* default configuration */
111 isl6421->config = ISL6421_ISEL1;
112 isl6421->i2c = i2c;
113 isl6421->i2c_addr = i2c_addr;
114 fe->sec_priv = isl6421;
115
116 /* bits which should be forced to '1' */
117 isl6421->override_or = override_set;
118
119 /* bits which should be forced to '0' */
120 isl6421->override_and = ~override_clear;
121
122 /* detect if it is present or not */
123 if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
124 kfree(isl6421);
125 return NULL;
126 }
127
128 /* install release callback */
129 fe->ops.release_sec = isl6421_release;
130
131 /* override frontend ops */
132 fe->ops.set_voltage = isl6421_set_voltage;
133 fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
134
135 return fe;
136}
137EXPORT_SYMBOL(isl6421_attach);
138
139MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
140MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
141MODULE_LICENSE("GPL");