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 * To obtain the license, point your browser to
19 * http://www.gnu.org/copyleft/gpl.html
20 *
21 *
22 * the project's page is at https://linuxtv.org
23 */
24 #include <linux/delay.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31
32 #include "dvb_frontend.h"
33 #include "isl6405.h"
34
35 struct isl6405 {
36 u8 config;
37 u8 override_or;
38 u8 override_and;
39 struct i2c_adapter *i2c;
40 u8 i2c_addr;
41 };
42
isl6405_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)43 static int isl6405_set_voltage(struct dvb_frontend *fe,
44 enum fe_sec_voltage voltage)
45 {
46 struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
47 struct i2c_msg msg = { .addr = isl6405->i2c_addr, .flags = 0,
48 .buf = &isl6405->config,
49 .len = sizeof(isl6405->config) };
50
51 if (isl6405->override_or & 0x80) {
52 isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
53 switch (voltage) {
54 case SEC_VOLTAGE_OFF:
55 break;
56 case SEC_VOLTAGE_13:
57 isl6405->config |= ISL6405_EN2;
58 break;
59 case SEC_VOLTAGE_18:
60 isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
61 break;
62 default:
63 return -EINVAL;
64 }
65 } else {
66 isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
67 switch (voltage) {
68 case SEC_VOLTAGE_OFF:
69 break;
70 case SEC_VOLTAGE_13:
71 isl6405->config |= ISL6405_EN1;
72 break;
73 case SEC_VOLTAGE_18:
74 isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
75 break;
76 default:
77 return -EINVAL;
78 }
79 }
80 isl6405->config |= isl6405->override_or;
81 isl6405->config &= isl6405->override_and;
82
83 return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
84 }
85
isl6405_enable_high_lnb_voltage(struct dvb_frontend * fe,long arg)86 static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
87 {
88 struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
89 struct i2c_msg msg = { .addr = isl6405->i2c_addr, .flags = 0,
90 .buf = &isl6405->config,
91 .len = sizeof(isl6405->config) };
92
93 if (isl6405->override_or & 0x80) {
94 if (arg)
95 isl6405->config |= ISL6405_LLC2;
96 else
97 isl6405->config &= ~ISL6405_LLC2;
98 } else {
99 if (arg)
100 isl6405->config |= ISL6405_LLC1;
101 else
102 isl6405->config &= ~ISL6405_LLC1;
103 }
104 isl6405->config |= isl6405->override_or;
105 isl6405->config &= isl6405->override_and;
106
107 return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
108 }
109
isl6405_release(struct dvb_frontend * fe)110 static void isl6405_release(struct dvb_frontend *fe)
111 {
112 /* power off */
113 isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
114
115 /* free */
116 kfree(fe->sec_priv);
117 fe->sec_priv = NULL;
118 }
119
isl6405_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,u8 i2c_addr,u8 override_set,u8 override_clear)120 struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
121 u8 i2c_addr, u8 override_set, u8 override_clear)
122 {
123 struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
124 if (!isl6405)
125 return NULL;
126
127 /* default configuration */
128 if (override_set & 0x80)
129 isl6405->config = ISL6405_ISEL2;
130 else
131 isl6405->config = ISL6405_ISEL1;
132 isl6405->i2c = i2c;
133 isl6405->i2c_addr = i2c_addr;
134 fe->sec_priv = isl6405;
135
136 /* bits which should be forced to '1' */
137 isl6405->override_or = override_set;
138
139 /* bits which should be forced to '0' */
140 isl6405->override_and = ~override_clear;
141
142 /* detect if it is present or not */
143 if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
144 kfree(isl6405);
145 fe->sec_priv = NULL;
146 return NULL;
147 }
148
149 /* install release callback */
150 fe->ops.release_sec = isl6405_release;
151
152 /* override frontend ops */
153 fe->ops.set_voltage = isl6405_set_voltage;
154 fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
155
156 return fe;
157 }
158 EXPORT_SYMBOL(isl6405_attach);
159
160 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
161 MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
162 MODULE_LICENSE("GPL");
163