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1 | /* |
2 | * lnbp22.h - driver for lnb supply and control ic lnbp22 | |
3 | * | |
4 | * Copyright (C) 2006 Dominik Kuhlen | |
5 | * Based on lnbp21 driver | |
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 "lnbp22.h" | |
38 | ||
39 | static int debug; | |
40 | module_param(debug, int, 0644); | |
41 | MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); | |
42 | ||
43 | ||
44 | #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg) | |
45 | ||
46 | struct lnbp22 { | |
47 | u8 config[4]; | |
48 | struct i2c_adapter *i2c; | |
49 | }; | |
50 | ||
51 | static int lnbp22_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) | |
52 | { | |
53 | struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv; | |
54 | struct i2c_msg msg = { | |
55 | .addr = 0x08, | |
56 | .flags = 0, | |
57 | .buf = (char *)&lnbp22->config, | |
58 | .len = sizeof(lnbp22->config), | |
59 | }; | |
60 | ||
61 | dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage, | |
62 | SEC_VOLTAGE_18, SEC_VOLTAGE_13); | |
63 | ||
64 | lnbp22->config[3] = 0x60; /* Power down */ | |
65 | switch (voltage) { | |
66 | case SEC_VOLTAGE_OFF: | |
67 | break; | |
68 | case SEC_VOLTAGE_13: | |
69 | lnbp22->config[3] |= LNBP22_EN; | |
70 | break; | |
71 | case SEC_VOLTAGE_18: | |
72 | lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL); | |
73 | break; | |
74 | default: | |
75 | return -EINVAL; | |
76 | }; | |
77 | ||
78 | dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]); | |
79 | return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
80 | } | |
81 | ||
82 | static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) | |
83 | { | |
84 | struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv; | |
85 | struct i2c_msg msg = { | |
86 | .addr = 0x08, | |
87 | .flags = 0, | |
88 | .buf = (char *)&lnbp22->config, | |
89 | .len = sizeof(lnbp22->config), | |
90 | }; | |
91 | ||
92 | dprintk(1, "%s: %d\n", __func__, (int)arg); | |
93 | if (arg) | |
94 | lnbp22->config[3] |= LNBP22_LLC; | |
95 | else | |
96 | lnbp22->config[3] &= ~LNBP22_LLC; | |
97 | ||
98 | return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
99 | } | |
100 | ||
101 | static void lnbp22_release(struct dvb_frontend *fe) | |
102 | { | |
103 | dprintk(1, "%s\n", __func__); | |
104 | /* LNBP power off */ | |
105 | lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF); | |
106 | ||
107 | /* free data */ | |
108 | kfree(fe->sec_priv); | |
109 | fe->sec_priv = NULL; | |
110 | } | |
111 | ||
112 | struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe, | |
113 | struct i2c_adapter *i2c) | |
114 | { | |
115 | struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL); | |
116 | if (!lnbp22) | |
117 | return NULL; | |
118 | ||
119 | /* default configuration */ | |
120 | lnbp22->config[0] = 0x00; /* ? */ | |
121 | lnbp22->config[1] = 0x28; /* ? */ | |
122 | lnbp22->config[2] = 0x48; /* ? */ | |
123 | lnbp22->config[3] = 0x60; /* Power down */ | |
124 | lnbp22->i2c = i2c; | |
125 | fe->sec_priv = lnbp22; | |
126 | ||
127 | /* detect if it is present or not */ | |
128 | if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) { | |
129 | dprintk(0, "%s LNBP22 not found\n", __func__); | |
130 | kfree(lnbp22); | |
131 | fe->sec_priv = NULL; | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | /* install release callback */ | |
136 | fe->ops.release_sec = lnbp22_release; | |
137 | ||
138 | /* override frontend ops */ | |
139 | fe->ops.set_voltage = lnbp22_set_voltage; | |
140 | fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage; | |
141 | ||
142 | return fe; | |
143 | } | |
144 | EXPORT_SYMBOL(lnbp22_attach); | |
145 | ||
146 | MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22"); | |
147 | MODULE_AUTHOR("Dominik Kuhlen"); | |
148 | MODULE_LICENSE("GPL"); |