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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> | |
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 | ||
39 | struct isl6421 { | |
40 | u8 config; | |
41 | u8 override_or; | |
42 | u8 override_and; | |
43 | struct i2c_adapter *i2c; | |
44 | u8 i2c_addr; | |
45 | void (*release_chain)(struct dvb_frontend* fe); | |
46 | }; | |
47 | ||
48 | static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) | |
49 | { | |
50 | struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv; | |
51 | struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, | |
52 | .buf = &isl6421->config, | |
53 | .len = sizeof(isl6421->config) }; | |
54 | ||
55 | isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); | |
56 | ||
57 | switch(voltage) { | |
58 | case SEC_VOLTAGE_OFF: | |
59 | break; | |
60 | case SEC_VOLTAGE_13: | |
61 | isl6421->config |= ISL6421_EN1; | |
62 | break; | |
63 | case SEC_VOLTAGE_18: | |
64 | isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1); | |
65 | break; | |
66 | default: | |
67 | return -EINVAL; | |
68 | }; | |
69 | ||
70 | isl6421->config |= isl6421->override_or; | |
71 | isl6421->config &= isl6421->override_and; | |
72 | ||
73 | return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
74 | } | |
75 | ||
76 | static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) | |
77 | { | |
78 | struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv; | |
79 | struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, | |
80 | .buf = &isl6421->config, | |
81 | .len = sizeof(isl6421->config) }; | |
82 | ||
83 | if (arg) | |
84 | isl6421->config |= ISL6421_LLC1; | |
85 | else | |
86 | isl6421->config &= ~ISL6421_LLC1; | |
87 | ||
88 | isl6421->config |= isl6421->override_or; | |
89 | isl6421->config &= isl6421->override_and; | |
90 | ||
91 | return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
92 | } | |
93 | ||
94 | static void isl6421_release(struct dvb_frontend *fe) | |
95 | { | |
96 | struct isl6421 *isl6421 = (struct isl6421 *) fe->misc_priv; | |
97 | ||
98 | /* power off */ | |
99 | isl6421_set_voltage(fe, SEC_VOLTAGE_OFF); | |
100 | ||
101 | /* free data & call next release routine */ | |
102 | fe->ops->release = isl6421->release_chain; | |
103 | kfree(fe->misc_priv); | |
104 | fe->misc_priv = NULL; | |
105 | if (fe->ops->release) | |
106 | fe->ops->release(fe); | |
107 | } | |
108 | ||
109 | int isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr, | |
110 | u8 override_set, u8 override_clear) | |
111 | { | |
112 | struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL); | |
113 | if (!isl6421) | |
114 | return -ENOMEM; | |
115 | ||
116 | /* default configuration */ | |
117 | isl6421->config = ISL6421_ISEL1; | |
118 | isl6421->i2c = i2c; | |
119 | isl6421->i2c_addr = i2c_addr; | |
120 | fe->misc_priv = isl6421; | |
121 | ||
122 | /* bits which should be forced to '1' */ | |
123 | isl6421->override_or = override_set; | |
124 | ||
125 | /* bits which should be forced to '0' */ | |
126 | isl6421->override_and = ~override_clear; | |
127 | ||
128 | /* detect if it is present or not */ | |
129 | if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) { | |
130 | kfree(isl6421); | |
131 | fe->misc_priv = NULL; | |
132 | return -EIO; | |
133 | } | |
134 | ||
135 | /* install release callback */ | |
136 | isl6421->release_chain = fe->ops->release; | |
137 | fe->ops->release = isl6421_release; | |
138 | ||
139 | /* override frontend ops */ | |
140 | fe->ops->set_voltage = isl6421_set_voltage; | |
141 | fe->ops->enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | EXPORT_SYMBOL(isl6421_attach); | |
146 | ||
147 | MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421"); | |
148 | MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss"); | |
149 | MODULE_LICENSE("GPL"); |