Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux-2.6-microblaze.git] / drivers / media / dvb-frontends / isl6421.c
1 /*
2  * isl6421.h - driver for lnb supply and control ic ISL6421
3  *
4  * Copyright (C) 2006 Andrew de Quincey
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 "dvb_frontend.h"
33 #include "isl6421.h"
34
35 struct isl6421 {
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 isl6421_set_voltage(struct dvb_frontend *fe,
44                                enum fe_sec_voltage voltage)
45 {
46         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
47         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
48                                 .buf = &isl6421->config,
49                                 .len = sizeof(isl6421->config) };
50
51         isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
52
53         switch(voltage) {
54         case SEC_VOLTAGE_OFF:
55                 break;
56         case SEC_VOLTAGE_13:
57                 isl6421->config |= ISL6421_EN1;
58                 break;
59         case SEC_VOLTAGE_18:
60                 isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
61                 break;
62         default:
63                 return -EINVAL;
64         }
65
66         isl6421->config |= isl6421->override_or;
67         isl6421->config &= isl6421->override_and;
68
69         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
70 }
71
72 static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
73 {
74         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
75         struct i2c_msg msg = {  .addr = isl6421->i2c_addr, .flags = 0,
76                                 .buf = &isl6421->config,
77                                 .len = sizeof(isl6421->config) };
78
79         if (arg)
80                 isl6421->config |= ISL6421_LLC1;
81         else
82                 isl6421->config &= ~ISL6421_LLC1;
83
84         isl6421->config |= isl6421->override_or;
85         isl6421->config &= isl6421->override_and;
86
87         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
88 }
89
90 static int isl6421_set_tone(struct dvb_frontend *fe,
91                             enum fe_sec_tone_mode tone)
92 {
93         struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
94         struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
95                                .buf = &isl6421->config,
96                                .len = sizeof(isl6421->config) };
97
98         switch (tone) {
99         case SEC_TONE_ON:
100                 isl6421->config |= ISL6421_ENT1;
101                 break;
102         case SEC_TONE_OFF:
103                 isl6421->config &= ~ISL6421_ENT1;
104                 break;
105         default:
106                 return -EINVAL;
107         }
108
109         isl6421->config |= isl6421->override_or;
110         isl6421->config &= isl6421->override_and;
111
112         return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
113 }
114
115 static void isl6421_release(struct dvb_frontend *fe)
116 {
117         /* power off */
118         isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
119
120         /* free */
121         kfree(fe->sec_priv);
122         fe->sec_priv = NULL;
123 }
124
125 struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
126                    u8 override_set, u8 override_clear, bool override_tone)
127 {
128         struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
129         if (!isl6421)
130                 return NULL;
131
132         /* default configuration */
133         isl6421->config = ISL6421_ISEL1;
134         isl6421->i2c = i2c;
135         isl6421->i2c_addr = i2c_addr;
136         fe->sec_priv = isl6421;
137
138         /* bits which should be forced to '1' */
139         isl6421->override_or = override_set;
140
141         /* bits which should be forced to '0' */
142         isl6421->override_and = ~override_clear;
143
144         /* detect if it is present or not */
145         if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
146                 kfree(isl6421);
147                 fe->sec_priv = NULL;
148                 return NULL;
149         }
150
151         /* install release callback */
152         fe->ops.release_sec = isl6421_release;
153
154         /* override frontend ops */
155         fe->ops.set_voltage = isl6421_set_voltage;
156         fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
157         if (override_tone)
158                 fe->ops.set_tone = isl6421_set_tone;
159
160         return fe;
161 }
162 EXPORT_SYMBOL(isl6421_attach);
163
164 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
165 MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
166 MODULE_LICENSE("GPL");