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a0c7056f | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4e2c53fd IL |
2 | /* |
3 | * lnbp22.h - driver for lnb supply and control ic lnbp22 | |
4 | * | |
5 | * Copyright (C) 2006 Dominik Kuhlen | |
6 | * Based on lnbp21 driver | |
7 | * | |
991ce92f | 8 | * the project's page is at https://linuxtv.org |
4e2c53fd IL |
9 | */ |
10 | #include <linux/delay.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/moduleparam.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/slab.h> | |
18 | ||
fada1935 | 19 | #include <media/dvb_frontend.h> |
4e2c53fd IL |
20 | #include "lnbp22.h" |
21 | ||
22 | static int debug; | |
23 | module_param(debug, int, 0644); | |
24 | MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); | |
25 | ||
26 | ||
27 | #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg) | |
28 | ||
29 | struct lnbp22 { | |
30 | u8 config[4]; | |
31 | struct i2c_adapter *i2c; | |
32 | }; | |
33 | ||
0df289a2 MCC |
34 | static int lnbp22_set_voltage(struct dvb_frontend *fe, |
35 | enum fe_sec_voltage voltage) | |
4e2c53fd IL |
36 | { |
37 | struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv; | |
38 | struct i2c_msg msg = { | |
39 | .addr = 0x08, | |
40 | .flags = 0, | |
41 | .buf = (char *)&lnbp22->config, | |
42 | .len = sizeof(lnbp22->config), | |
43 | }; | |
44 | ||
45 | dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage, | |
46 | SEC_VOLTAGE_18, SEC_VOLTAGE_13); | |
47 | ||
48 | lnbp22->config[3] = 0x60; /* Power down */ | |
49 | switch (voltage) { | |
50 | case SEC_VOLTAGE_OFF: | |
51 | break; | |
52 | case SEC_VOLTAGE_13: | |
53 | lnbp22->config[3] |= LNBP22_EN; | |
54 | break; | |
55 | case SEC_VOLTAGE_18: | |
56 | lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL); | |
57 | break; | |
58 | default: | |
59 | return -EINVAL; | |
c2c1b415 | 60 | } |
4e2c53fd IL |
61 | |
62 | dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]); | |
63 | return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
64 | } | |
65 | ||
66 | static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) | |
67 | { | |
68 | struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv; | |
69 | struct i2c_msg msg = { | |
70 | .addr = 0x08, | |
71 | .flags = 0, | |
72 | .buf = (char *)&lnbp22->config, | |
73 | .len = sizeof(lnbp22->config), | |
74 | }; | |
75 | ||
76 | dprintk(1, "%s: %d\n", __func__, (int)arg); | |
77 | if (arg) | |
78 | lnbp22->config[3] |= LNBP22_LLC; | |
79 | else | |
80 | lnbp22->config[3] &= ~LNBP22_LLC; | |
81 | ||
82 | return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; | |
83 | } | |
84 | ||
85 | static void lnbp22_release(struct dvb_frontend *fe) | |
86 | { | |
87 | dprintk(1, "%s\n", __func__); | |
88 | /* LNBP power off */ | |
89 | lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF); | |
90 | ||
91 | /* free data */ | |
92 | kfree(fe->sec_priv); | |
93 | fe->sec_priv = NULL; | |
94 | } | |
95 | ||
96 | struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe, | |
97 | struct i2c_adapter *i2c) | |
98 | { | |
99 | struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL); | |
100 | if (!lnbp22) | |
101 | return NULL; | |
102 | ||
103 | /* default configuration */ | |
104 | lnbp22->config[0] = 0x00; /* ? */ | |
105 | lnbp22->config[1] = 0x28; /* ? */ | |
106 | lnbp22->config[2] = 0x48; /* ? */ | |
107 | lnbp22->config[3] = 0x60; /* Power down */ | |
108 | lnbp22->i2c = i2c; | |
109 | fe->sec_priv = lnbp22; | |
110 | ||
111 | /* detect if it is present or not */ | |
112 | if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) { | |
113 | dprintk(0, "%s LNBP22 not found\n", __func__); | |
114 | kfree(lnbp22); | |
115 | fe->sec_priv = NULL; | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | /* install release callback */ | |
120 | fe->ops.release_sec = lnbp22_release; | |
121 | ||
122 | /* override frontend ops */ | |
123 | fe->ops.set_voltage = lnbp22_set_voltage; | |
124 | fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage; | |
125 | ||
126 | return fe; | |
127 | } | |
128 | EXPORT_SYMBOL(lnbp22_attach); | |
129 | ||
130 | MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22"); | |
131 | MODULE_AUTHOR("Dominik Kuhlen"); | |
132 | MODULE_LICENSE("GPL"); |