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
lnbp22_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)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(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
64 }
65
lnbp22_enable_high_lnb_voltage(struct dvb_frontend * fe,long arg)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
lnbp22_release(struct dvb_frontend * fe)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
lnbp22_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c)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");
133