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21c28582 AQ |
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> | |
21c28582 AQ |
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; | |
21c28582 AQ |
44 | }; |
45 | ||
46 | static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) | |
47 | { | |
13fef933 | 48 | struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; |
21c28582 AQ |
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 | ||
74 | static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) | |
75 | { | |
13fef933 | 76 | struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; |
21c28582 AQ |
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 | ||
92 | static void isl6421_release(struct dvb_frontend *fe) | |
93 | { | |
21c28582 AQ |
94 | /* power off */ |
95 | isl6421_set_voltage(fe, SEC_VOLTAGE_OFF); | |
96 | ||
13fef933 AQ |
97 | /* free */ |
98 | kfree(fe->sec_priv); | |
99 | fe->sec_priv = NULL; | |
21c28582 AQ |
100 | } |
101 | ||
13fef933 | 102 | struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr, |
21c28582 AQ |
103 | u8 override_set, u8 override_clear) |
104 | { | |
105 | struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL); | |
106 | if (!isl6421) | |
13fef933 | 107 | return NULL; |
21c28582 AQ |
108 | |
109 | /* default configuration */ | |
110 | isl6421->config = ISL6421_ISEL1; | |
111 | isl6421->i2c = i2c; | |
112 | isl6421->i2c_addr = i2c_addr; | |
13fef933 | 113 | fe->sec_priv = isl6421; |
21c28582 AQ |
114 | |
115 | /* bits which should be forced to '1' */ | |
116 | isl6421->override_or = override_set; | |
117 | ||
118 | /* bits which should be forced to '0' */ | |
119 | isl6421->override_and = ~override_clear; | |
120 | ||
121 | /* detect if it is present or not */ | |
122 | if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) { | |
123 | kfree(isl6421); | |
09d48954 | 124 | fe->sec_priv = NULL; |
13fef933 | 125 | return NULL; |
21c28582 AQ |
126 | } |
127 | ||
128 | /* install release callback */ | |
62a7b3e2 | 129 | fe->ops.release_sec = isl6421_release; |
21c28582 AQ |
130 | |
131 | /* override frontend ops */ | |
dea74869 PB |
132 | fe->ops.set_voltage = isl6421_set_voltage; |
133 | fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage; | |
21c28582 | 134 | |
13fef933 | 135 | return fe; |
21c28582 AQ |
136 | } |
137 | EXPORT_SYMBOL(isl6421_attach); | |
138 | ||
139 | MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421"); | |
140 | MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss"); | |
141 | MODULE_LICENSE("GPL"); |