1 /*
2  * isl6405.c - driver for dual lnb supply and control ic ISL6405
3  *
4  * Copyright (C) 2008 Hartmut Hackmann
5  * Copyright (C) 2006 Oliver Endriss
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * To obtain the license, point your browser to
19  * http://www.gnu.org/copyleft/gpl.html
20  *
21  *
22  * the project's page is at https://linuxtv.org
23  */
24 #include <linux/delay.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 
32 #include <media/dvb_frontend.h>
33 #include "isl6405.h"
34 
35 struct isl6405 {
36 	u8			config;
37 	u8			override_or;
38 	u8			override_and;
39 	struct i2c_adapter	*i2c;
40 	u8			i2c_addr;
41 };
42 
43 static int isl6405_set_voltage(struct dvb_frontend *fe,
44 			       enum fe_sec_voltage voltage)
45 {
46 	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
47 	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
48 				.buf = &isl6405->config,
49 				.len = sizeof(isl6405->config) };
50 
51 	if (isl6405->override_or & 0x80) {
52 		isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
53 		switch (voltage) {
54 		case SEC_VOLTAGE_OFF:
55 			break;
56 		case SEC_VOLTAGE_13:
57 			isl6405->config |= ISL6405_EN2;
58 			break;
59 		case SEC_VOLTAGE_18:
60 			isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
61 			break;
62 		default:
63 			return -EINVAL;
64 		}
65 	} else {
66 		isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
67 		switch (voltage) {
68 		case SEC_VOLTAGE_OFF:
69 			break;
70 		case SEC_VOLTAGE_13:
71 			isl6405->config |= ISL6405_EN1;
72 			break;
73 		case SEC_VOLTAGE_18:
74 			isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
75 			break;
76 		default:
77 			return -EINVAL;
78 		}
79 	}
80 	isl6405->config |= isl6405->override_or;
81 	isl6405->config &= isl6405->override_and;
82 
83 	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
84 }
85 
86 static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
87 {
88 	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
89 	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
90 				.buf = &isl6405->config,
91 				.len = sizeof(isl6405->config) };
92 
93 	if (isl6405->override_or & 0x80) {
94 		if (arg)
95 			isl6405->config |= ISL6405_LLC2;
96 		else
97 			isl6405->config &= ~ISL6405_LLC2;
98 	} else {
99 		if (arg)
100 			isl6405->config |= ISL6405_LLC1;
101 		else
102 			isl6405->config &= ~ISL6405_LLC1;
103 	}
104 	isl6405->config |= isl6405->override_or;
105 	isl6405->config &= isl6405->override_and;
106 
107 	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
108 }
109 
110 static void isl6405_release(struct dvb_frontend *fe)
111 {
112 	/* power off */
113 	isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
114 
115 	/* free */
116 	kfree(fe->sec_priv);
117 	fe->sec_priv = NULL;
118 }
119 
120 struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
121 				    u8 i2c_addr, u8 override_set, u8 override_clear)
122 {
123 	struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
124 	if (!isl6405)
125 		return NULL;
126 
127 	/* default configuration */
128 	if (override_set & 0x80)
129 		isl6405->config = ISL6405_ISEL2;
130 	else
131 		isl6405->config = ISL6405_ISEL1;
132 	isl6405->i2c = i2c;
133 	isl6405->i2c_addr = i2c_addr;
134 	fe->sec_priv = isl6405;
135 
136 	/* bits which should be forced to '1' */
137 	isl6405->override_or = override_set;
138 
139 	/* bits which should be forced to '0' */
140 	isl6405->override_and = ~override_clear;
141 
142 	/* detect if it is present or not */
143 	if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
144 		kfree(isl6405);
145 		fe->sec_priv = NULL;
146 		return NULL;
147 	}
148 
149 	/* install release callback */
150 	fe->ops.release_sec = isl6405_release;
151 
152 	/* override frontend ops */
153 	fe->ops.set_voltage = isl6405_set_voltage;
154 	fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
155 
156 	return fe;
157 }
158 EXPORT_SYMBOL(isl6405_attach);
159 
160 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
161 MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
162 MODULE_LICENSE("GPL");
163