1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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 | * |
8 | * the project's page is at https://linuxtv.org |
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 | |
19 | #include <media/dvb_frontend.h> |
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 | |
34 | static int lnbp22_set_voltage(struct dvb_frontend *fe, |
35 | enum fe_sec_voltage voltage) |
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; |
60 | } |
61 | |
62 | dprintk(1, "%s: 0x%02x)\n" , __func__, lnbp22->config[3]); |
63 | return (i2c_transfer(adap: lnbp22->i2c, msgs: &msg, num: 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(adap: lnbp22->i2c, msgs: &msg, num: 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, voltage: SEC_VOLTAGE_OFF); |
90 | |
91 | /* free data */ |
92 | kfree(objp: 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(size: 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, voltage: SEC_VOLTAGE_OFF)) { |
113 | dprintk(0, "%s LNBP22 not found\n" , __func__); |
114 | kfree(objp: 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_GPL(lnbp22_attach); |
129 | |
130 | MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22" ); |
131 | MODULE_AUTHOR("Dominik Kuhlen" ); |
132 | MODULE_LICENSE("GPL" ); |
133 | |