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 https://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
38 struct isl6421 {
39 u8 config;
40 u8 override_or;
41 u8 override_and;
42 struct i2c_adapter *i2c;
43 u8 i2c_addr;
44 };
45
isl6421_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)46 static int isl6421_set_voltage(struct dvb_frontend *fe,
47 enum fe_sec_voltage 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
isl6421_enable_high_lnb_voltage(struct dvb_frontend * fe,long arg)75 static 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
isl6421_set_tone(struct dvb_frontend * fe,enum fe_sec_tone_mode tone)93 static int isl6421_set_tone(struct dvb_frontend *fe,
94 enum fe_sec_tone_mode tone)
95 {
96 struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
97 struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
98 .buf = &isl6421->config,
99 .len = sizeof(isl6421->config) };
100
101 switch (tone) {
102 case SEC_TONE_ON:
103 isl6421->config |= ISL6421_ENT1;
104 break;
105 case SEC_TONE_OFF:
106 isl6421->config &= ~ISL6421_ENT1;
107 break;
108 default:
109 return -EINVAL;
110 }
111
112 isl6421->config |= isl6421->override_or;
113 isl6421->config &= isl6421->override_and;
114
115 return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
116 }
117
isl6421_release(struct dvb_frontend * fe)118 static void isl6421_release(struct dvb_frontend *fe)
119 {
120 /* power off */
121 isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
122
123 /* free */
124 kfree(fe->sec_priv);
125 fe->sec_priv = NULL;
126 }
127
isl6421_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,u8 i2c_addr,u8 override_set,u8 override_clear,bool override_tone)128 struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
129 u8 override_set, u8 override_clear, bool override_tone)
130 {
131 struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
132 if (!isl6421)
133 return NULL;
134
135 /* default configuration */
136 isl6421->config = ISL6421_ISEL1;
137 isl6421->i2c = i2c;
138 isl6421->i2c_addr = i2c_addr;
139 fe->sec_priv = isl6421;
140
141 /* bits which should be forced to '1' */
142 isl6421->override_or = override_set;
143
144 /* bits which should be forced to '0' */
145 isl6421->override_and = ~override_clear;
146
147 /* detect if it is present or not */
148 if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
149 kfree(isl6421);
150 fe->sec_priv = NULL;
151 return NULL;
152 }
153
154 /* install release callback */
155 fe->ops.release_sec = isl6421_release;
156
157 /* override frontend ops */
158 fe->ops.set_voltage = isl6421_set_voltage;
159 fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
160 if (override_tone)
161 fe->ops.set_tone = isl6421_set_tone;
162
163 return fe;
164 }
165 EXPORT_SYMBOL(isl6421_attach);
166
167 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
168 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
169 MODULE_LICENSE("GPL");
170