LXR linux/drivers/media/dvb-frontends/lnbh25.c

   1/*
   2 * lnbh25.c
   3 *
   4 * Driver for LNB supply and control IC LNBH25
   5 *
   6 * Copyright (C) 2014 NetUP Inc.
   7 * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
   8 * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
   9 *
  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.
  14 *
  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.
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/init.h>
  23#include <linux/string.h>
  24#include <linux/slab.h>
  25
  26#include <media/dvb_frontend.h>
  27#include "lnbh25.h"
  28
  29/**
  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
  37 */
  38struct lnbh25_priv {
  39        struct i2c_adapter      *i2c;
  40        u8                      i2c_address;
  41        u8                      config[3];
  42};
  43
  44#define LNBH25_STATUS_OFL       0x1
  45#define LNBH25_STATUS_VMON      0x4
  46#define LNBH25_VSEL_13          0x03
  47#define LNBH25_VSEL_18          0x0a
  48
  49static int lnbh25_read_vmon(struct lnbh25_priv *priv)
  50{
  51        int i, ret;
  52        u8 addr = 0x00;
  53        u8 status[6];
  54        struct i2c_msg msg[2] = {
  55                {
  56                        .addr = priv->i2c_address,
  57                        .flags = 0,
  58                        .len = 1,
  59                        .buf = &addr
  60                }, {
  61                        .addr = priv->i2c_address,
  62                        .flags = I2C_M_RD,
  63                        .len = sizeof(status),
  64                        .buf = status
  65                }
  66        };
  67
  68        for (i = 0; i < 2; i++) {
  69                ret = i2c_transfer(priv->i2c, &msg[i], 1);
  70                if (ret >= 0 && ret != 1)
  71                        ret = -EIO;
  72                if (ret < 0) {
  73                        dev_dbg(&priv->i2c->dev,
  74                                "%s(): I2C transfer %d failed (%d)\n",
  75                                __func__, i, ret);
  76                        return ret;
  77                }
  78        }
  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",
  84                        __func__, status[0]);
  85                return -EIO;
  86        }
  87        return 0;
  88}
  89
  90static int lnbh25_set_voltage(struct dvb_frontend *fe,
  91                              enum fe_sec_voltage voltage)
  92{
  93        int ret;
  94        u8 data1_reg;
  95        const char *vsel;
  96        struct lnbh25_priv *priv = fe->sec_priv;
  97        struct i2c_msg msg = {
  98                .addr = priv->i2c_address,
  99                .flags = 0,
 100                .len = sizeof(priv->config),
 101                .buf = priv->config
 102        };
 103
 104        switch (voltage) {
 105        case SEC_VOLTAGE_OFF:
 106                data1_reg = 0x00;
 107                vsel = "Off";
 108                break;
 109        case SEC_VOLTAGE_13:
 110                data1_reg = LNBH25_VSEL_13;
 111                vsel = "13V";
 112                break;
 113        case SEC_VOLTAGE_18:
 114                data1_reg = LNBH25_VSEL_18;
 115                vsel = "18V";
 116                break;
 117        default:
 118                return -EINVAL;
 119        }
 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)
 127                ret = -EIO;
 128        if (ret < 0) {
 129                dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
 130                        __func__, ret);
 131                return ret;
 132        }
 133        if (voltage != SEC_VOLTAGE_OFF) {
 134                msleep(120);
 135                ret = lnbh25_read_vmon(priv);
 136        } else {
 137                msleep(20);
 138                ret = 0;
 139        }
 140        return ret;
 141}
 142
 143static void lnbh25_release(struct dvb_frontend *fe)
 144{
 145        struct lnbh25_priv *priv = fe->sec_priv;
 146
 147        dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
 148        lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
 149        kfree(fe->sec_priv);
 150        fe->sec_priv = NULL;
 151}
 152
 153struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
 154                                   struct lnbh25_config *cfg,
 155                                   struct i2c_adapter *i2c)
 156{
 157        struct lnbh25_priv *priv;
 158
 159        dev_dbg(&i2c->dev, "%s()\n", __func__);
 160        priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
 161        if (!priv)
 162                return NULL;
 163        priv->i2c_address = (cfg->i2c_address >> 1);
 164        priv->i2c = i2c;
 165        priv->config[0] = 0x02;
 166        priv->config[1] = 0x00;
 167        priv->config[2] = cfg->data2_config;
 168        fe->sec_priv = priv;
 169        if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 170                dev_err(&i2c->dev,
 171                        "%s(): no LNBH25 found at I2C addr 0x%02x\n",
 172                        __func__, priv->i2c_address);
 173                kfree(priv);
 174                fe->sec_priv = NULL;
 175                return NULL;
 176        }
 177
 178        fe->ops.release_sec = lnbh25_release;
 179        fe->ops.set_voltage = lnbh25_set_voltage;
 180
 181        dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
 182                __func__, priv->i2c_address);
 183        return fe;
 184}
 185EXPORT_SYMBOL(lnbh25_attach);
 186
 187MODULE_DESCRIPTION("ST LNBH25 driver");
 188MODULE_AUTHOR("info@netup.ru");
 189MODULE_LICENSE("GPL");
 190