4 * Driver for LNB supply and control IC LNBH25
6 * Copyright (C) 2014 NetUP Inc.
7 * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
8 * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
26 #include <media/dvb_frontend.h>
30 * struct lnbh25_priv - LNBH25 driver private data
31 * @i2c: pointer to the I2C adapter structure
32 * @i2c_address: I2C address of LNBH25 SEC chip
33 * @config: Registers configuration:
34 * offset 0: 1st register address, always 0x02 (DATA1)
35 * offset 1: DATA1 register value
36 * offset 2: DATA2 register value
39 struct i2c_adapter *i2c;
44 #define LNBH25_STATUS_OFL 0x1
45 #define LNBH25_STATUS_VMON 0x4
46 #define LNBH25_VSEL_13 0x03
47 #define LNBH25_VSEL_18 0x0a
49 static int lnbh25_read_vmon(struct lnbh25_priv *priv)
54 struct i2c_msg msg[2] = {
56 .addr = priv->i2c_address,
61 .addr = priv->i2c_address,
63 .len = sizeof(status),
68 for (i = 0; i < 2; i++) {
69 ret = i2c_transfer(priv->i2c, &msg[i], 1);
70 if (ret >= 0 && ret != 1)
73 dev_dbg(&priv->i2c->dev,
74 "%s(): I2C transfer %d failed (%d)\n",
79 dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
80 __func__, (int) sizeof(status), status);
81 if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
82 dev_err(&priv->i2c->dev,
83 "%s(): voltage in failure state, status reg 0x%x\n",
90 static int lnbh25_set_voltage(struct dvb_frontend *fe,
91 enum fe_sec_voltage voltage)
96 struct lnbh25_priv *priv = fe->sec_priv;
97 struct i2c_msg msg = {
98 .addr = priv->i2c_address,
100 .len = sizeof(priv->config),
105 case SEC_VOLTAGE_OFF:
110 data1_reg = LNBH25_VSEL_13;
114 data1_reg = LNBH25_VSEL_18;
120 priv->config[1] = data1_reg;
121 dev_dbg(&priv->i2c->dev,
122 "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
123 __func__, vsel, priv->i2c_address,
124 priv->config[0], priv->config[1], priv->config[2]);
125 ret = i2c_transfer(priv->i2c, &msg, 1);
126 if (ret >= 0 && ret != 1)
129 dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
133 if (voltage != SEC_VOLTAGE_OFF) {
135 ret = lnbh25_read_vmon(priv);
143 static void lnbh25_release(struct dvb_frontend *fe)
145 struct lnbh25_priv *priv = fe->sec_priv;
147 dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
148 lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
153 struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
154 struct lnbh25_config *cfg,
155 struct i2c_adapter *i2c)
157 struct lnbh25_priv *priv;
159 dev_dbg(&i2c->dev, "%s()\n", __func__);
160 priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
163 priv->i2c_address = (cfg->i2c_address >> 1);
165 priv->config[0] = 0x02;
166 priv->config[1] = 0x00;
167 priv->config[2] = cfg->data2_config;
169 if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
171 "%s(): no LNBH25 found at I2C addr 0x%02x\n",
172 __func__, priv->i2c_address);
178 fe->ops.release_sec = lnbh25_release;
179 fe->ops.set_voltage = lnbh25_set_voltage;
181 dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
182 __func__, priv->i2c_address);
185 EXPORT_SYMBOL(lnbh25_attach);
187 MODULE_DESCRIPTION("ST LNBH25 driver");
188 MODULE_AUTHOR("info@netup.ru");
189 MODULE_LICENSE("GPL");