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lnbp22.c
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1 /*
2  * lnbp22.h - driver for lnb supply and control ic lnbp22
3  *
4  * Copyright (C) 2006 Dominik Kuhlen
5  * Based on lnbp21 driver
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  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
23  *
24  *
25  * the project's page is at http://www.linuxtv.org
26  */
27 #include <linux/delay.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/string.h>
34 #include <linux/slab.h>
35 
36 #include "dvb_frontend.h"
37 #include "lnbp22.h"
38 
39 static int debug;
40 module_param(debug, int, 0644);
41 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
42 
43 
44 #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
45 
46 struct lnbp22 {
47  u8 config[4];
48  struct i2c_adapter *i2c;
49 };
50 
51 static int lnbp22_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
52 {
53  struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
54  struct i2c_msg msg = {
55  .addr = 0x08,
56  .flags = 0,
57  .buf = (char *)&lnbp22->config,
58  .len = sizeof(lnbp22->config),
59  };
60 
61  dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage,
63 
64  lnbp22->config[3] = 0x60; /* Power down */
65  switch (voltage) {
66  case SEC_VOLTAGE_OFF:
67  break;
68  case SEC_VOLTAGE_13:
69  lnbp22->config[3] |= LNBP22_EN;
70  break;
71  case SEC_VOLTAGE_18:
72  lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL);
73  break;
74  default:
75  return -EINVAL;
76  }
77 
78  dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]);
79  return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
80 }
81 
82 static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
83 {
84  struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
85  struct i2c_msg msg = {
86  .addr = 0x08,
87  .flags = 0,
88  .buf = (char *)&lnbp22->config,
89  .len = sizeof(lnbp22->config),
90  };
91 
92  dprintk(1, "%s: %d\n", __func__, (int)arg);
93  if (arg)
94  lnbp22->config[3] |= LNBP22_LLC;
95  else
96  lnbp22->config[3] &= ~LNBP22_LLC;
97 
98  return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
99 }
100 
101 static void lnbp22_release(struct dvb_frontend *fe)
102 {
103  dprintk(1, "%s\n", __func__);
104  /* LNBP power off */
105  lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
106 
107  /* free data */
108  kfree(fe->sec_priv);
109  fe->sec_priv = NULL;
110 }
111 
113  struct i2c_adapter *i2c)
114 {
115  struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL);
116  if (!lnbp22)
117  return NULL;
118 
119  /* default configuration */
120  lnbp22->config[0] = 0x00; /* ? */
121  lnbp22->config[1] = 0x28; /* ? */
122  lnbp22->config[2] = 0x48; /* ? */
123  lnbp22->config[3] = 0x60; /* Power down */
124  lnbp22->i2c = i2c;
125  fe->sec_priv = lnbp22;
126 
127  /* detect if it is present or not */
128  if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
129  dprintk(0, "%s LNBP22 not found\n", __func__);
130  kfree(lnbp22);
131  fe->sec_priv = NULL;
132  return NULL;
133  }
134 
135  /* install release callback */
136  fe->ops.release_sec = lnbp22_release;
137 
138  /* override frontend ops */
139  fe->ops.set_voltage = lnbp22_set_voltage;
140  fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
141 
142  return fe;
143 }
145 
146 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
147 MODULE_AUTHOR("Dominik Kuhlen");
148 MODULE_LICENSE("GPL");