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1 | /* |
2 | * lnbp21.h - driver for lnb supply and control ic lnbp21 | |
3 | * | |
4 | * Copyright (C) 2006 Oliver Endriss | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * Or, point your browser to http://www.gnu.org/copyleft/gpl.html | |
22 | * | |
23 | * | |
24 | * the project's page is at http://www.linuxtv.org | |
25 | */ | |
26 | #include <linux/delay.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/moduleparam.h> | |
32 | #include <linux/string.h> | |
33 | #include <linux/slab.h> | |
34 | ||
35 | #include "dvb_frontend.h" | |
36 | #include "lnbp21.h" | |
37 | ||
38 | struct lnbp21 { | |
39 | u8 config; | |
40 | u8 override_or; | |
41 | u8 override_and; | |
42 | struct i2c_adapter *i2c; | |
43 | void (*release_chain)(struct dvb_frontend* fe); | |
44 | }; | |
45 | ||
46 | static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) | |
47 | { | |
48 | struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv; | |
49 | struct i2c_msg msg = { .addr = 0x08, .flags = 0, | |
50 | .buf = &lnbp21->config, | |
51 | .len = sizeof(lnbp21->config) }; | |
52 | ||
53 | lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN); | |
54 | ||
55 | switch(voltage) { | |
56 | case SEC_VOLTAGE_OFF: | |
57 | break; | |
58 | case SEC_VOLTAGE_13: | |
59 | lnbp21->config |= LNBP21_EN; | |
60 | break; | |
61 | case SEC_VOLTAGE_18: | |
62 | lnbp21->config |= (LNBP21_EN | LNBP21_VSEL); | |
63 | break; | |
64 | default: | |
65 | return -EINVAL; | |
66 | }; | |
67 | ||
68 | lnbp21->config |= lnbp21->override_or; | |
69 | lnbp21->config &= lnbp21->override_and; | |
70 | ||
71 | return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
72 | } | |
73 | ||
74 | static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) | |
75 | { | |
76 | struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv; | |
77 | struct i2c_msg msg = { .addr = 0x08, .flags = 0, | |
78 | .buf = &lnbp21->config, | |
79 | .len = sizeof(lnbp21->config) }; | |
80 | ||
81 | if (arg) | |
82 | lnbp21->config |= LNBP21_LLC; | |
83 | else | |
84 | lnbp21->config &= ~LNBP21_LLC; | |
85 | ||
86 | lnbp21->config |= lnbp21->override_or; | |
87 | lnbp21->config &= lnbp21->override_and; | |
88 | ||
89 | return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
90 | } | |
91 | ||
92 | static void lnbp21_release(struct dvb_frontend *fe) | |
93 | { | |
94 | struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv; | |
95 | ||
96 | /* LNBP power off */ | |
97 | lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF); | |
98 | ||
99 | /* free data & call next release routine */ | |
100 | fe->ops->release = lnbp21->release_chain; | |
101 | kfree(fe->misc_priv); | |
102 | fe->misc_priv = NULL; | |
103 | if (fe->ops->release) | |
104 | fe->ops->release(fe); | |
105 | } | |
106 | ||
107 | int lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear) | |
108 | { | |
109 | struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL); | |
110 | if (!lnbp21) | |
111 | return -ENOMEM; | |
112 | ||
113 | /* default configuration */ | |
114 | lnbp21->config = LNBP21_ISEL; | |
115 | lnbp21->i2c = i2c; | |
116 | fe->misc_priv = lnbp21; | |
117 | ||
118 | /* bits which should be forced to '1' */ | |
119 | lnbp21->override_or = override_set; | |
120 | ||
121 | /* bits which should be forced to '0' */ | |
122 | lnbp21->override_and = ~override_clear; | |
123 | ||
124 | /* detect if it is present or not */ | |
125 | if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) { | |
126 | kfree(lnbp21); | |
127 | fe->misc_priv = NULL; | |
128 | return -EIO; | |
129 | } | |
130 | ||
131 | /* install release callback */ | |
132 | lnbp21->release_chain = fe->ops->release; | |
133 | fe->ops->release = lnbp21_release; | |
134 | ||
135 | /* override frontend ops */ | |
136 | fe->ops->set_voltage = lnbp21_set_voltage; | |
137 | fe->ops->enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | EXPORT_SYMBOL(lnbp21_attach); | |
142 | ||
143 | MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21"); | |
144 | MODULE_AUTHOR("Oliver Endriss"); | |
145 | MODULE_LICENSE("GPL"); |