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(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");
133