1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * isl6405.c - driver for dual lnb supply and control ic ISL6405
4  *
5  * Copyright (C) 2008 Hartmut Hackmann
6  * Copyright (C) 2006 Oliver Endriss
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/string.h>
16 #include <linux/slab.h>
17 
18 #include <media/dvb_frontend.h>
19 #include "isl6405.h"
20 
21 struct isl6405 {
22 	u8			config;
23 	u8			override_or;
24 	u8			override_and;
25 	struct i2c_adapter	*i2c;
26 	u8			i2c_addr;
27 };
28 
29 static int isl6405_set_voltage(struct dvb_frontend *fe,
30 			       enum fe_sec_voltage voltage)
31 {
32 	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
33 	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
34 				.buf = &isl6405->config,
35 				.len = sizeof(isl6405->config) };
36 
37 	if (isl6405->override_or & 0x80) {
38 		isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
39 		switch (voltage) {
40 		case SEC_VOLTAGE_OFF:
41 			break;
42 		case SEC_VOLTAGE_13:
43 			isl6405->config |= ISL6405_EN2;
44 			break;
45 		case SEC_VOLTAGE_18:
46 			isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
47 			break;
48 		default:
49 			return -EINVAL;
50 		}
51 	} else {
52 		isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
53 		switch (voltage) {
54 		case SEC_VOLTAGE_OFF:
55 			break;
56 		case SEC_VOLTAGE_13:
57 			isl6405->config |= ISL6405_EN1;
58 			break;
59 		case SEC_VOLTAGE_18:
60 			isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
61 			break;
62 		default:
63 			return -EINVAL;
64 		}
65 	}
66 	isl6405->config |= isl6405->override_or;
67 	isl6405->config &= isl6405->override_and;
68 
69 	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
70 }
71 
72 static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
73 {
74 	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
75 	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
76 				.buf = &isl6405->config,
77 				.len = sizeof(isl6405->config) };
78 
79 	if (isl6405->override_or & 0x80) {
80 		if (arg)
81 			isl6405->config |= ISL6405_LLC2;
82 		else
83 			isl6405->config &= ~ISL6405_LLC2;
84 	} else {
85 		if (arg)
86 			isl6405->config |= ISL6405_LLC1;
87 		else
88 			isl6405->config &= ~ISL6405_LLC1;
89 	}
90 	isl6405->config |= isl6405->override_or;
91 	isl6405->config &= isl6405->override_and;
92 
93 	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
94 }
95 
96 static void isl6405_release(struct dvb_frontend *fe)
97 {
98 	/* power off */
99 	isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
100 
101 	/* free */
102 	kfree(fe->sec_priv);
103 	fe->sec_priv = NULL;
104 }
105 
106 struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
107 				    u8 i2c_addr, u8 override_set, u8 override_clear)
108 {
109 	struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
110 	if (!isl6405)
111 		return NULL;
112 
113 	/* default configuration */
114 	if (override_set & 0x80)
115 		isl6405->config = ISL6405_ISEL2;
116 	else
117 		isl6405->config = ISL6405_ISEL1;
118 	isl6405->i2c = i2c;
119 	isl6405->i2c_addr = i2c_addr;
120 	fe->sec_priv = isl6405;
121 
122 	/* bits which should be forced to '1' */
123 	isl6405->override_or = override_set;
124 
125 	/* bits which should be forced to '0' */
126 	isl6405->override_and = ~override_clear;
127 
128 	/* detect if it is present or not */
129 	if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
130 		kfree(isl6405);
131 		fe->sec_priv = NULL;
132 		return NULL;
133 	}
134 
135 	/* install release callback */
136 	fe->ops.release_sec = isl6405_release;
137 
138 	/* override frontend ops */
139 	fe->ops.set_voltage = isl6405_set_voltage;
140 	fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
141 
142 	return fe;
143 }
144 EXPORT_SYMBOL(isl6405_attach);
145 
146 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
147 MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
148 MODULE_LICENSE("GPL");
149