drivers/media/dvb-frontends/lnbh25.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * lnbh25.c
   4  *
   5  * Driver for LNB supply and control IC LNBH25
   6  *
   7  * Copyright (C) 2014 NetUP Inc.
   8  * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
   9  * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/string.h>
  15 #include <linux/slab.h>
  16
  17 #include <media/dvb_frontend.h>
  18 #include "lnbh25.h"
  19
  20 /**
  21  * struct lnbh25_priv - LNBH25 driver private data
  22  * @i2c:                pointer to the I2C adapter structure
  23  * @i2c_address:        I2C address of LNBH25 SEC chip
  24  * @config:             Registers configuration:
  25  *                      offset 0: 1st register address, always 0x02 (DATA1)
  26  *                      offset 1: DATA1 register value
  27  *                      offset 2: DATA2 register value
  28  */
  29 struct lnbh25_priv {
  30         struct i2c_adapter      *i2c;
  31         u8                      i2c_address;
  32         u8                      config[3];
  33 };
  34
  35 #define LNBH25_STATUS_OFL       0x1
  36 #define LNBH25_STATUS_VMON      0x4
  37 #define LNBH25_VSEL_13          0x03
  38 #define LNBH25_VSEL_18          0x0a
  39
  40 static int lnbh25_read_vmon(struct lnbh25_priv *priv)
  41 {
  42         int i, ret;
  43         u8 addr = 0x00;
  44         u8 status[6];
  45         struct i2c_msg msg[2] = {
  46                 {
  47                         .addr = priv->i2c_address,
  48                         .flags = 0,
  49                         .len = 1,
  50                         .buf = &addr
  51                 }, {
  52                         .addr = priv->i2c_address,
  53                         .flags = I2C_M_RD,
  54                         .len = sizeof(status),
  55                         .buf = status
  56                 }
  57         };
  58
  59         for (i = 0; i < 2; i++) {
  60                 ret = i2c_transfer(priv->i2c, &msg[i], 1);
  61                 if (ret >= 0 && ret != 1)
  62                         ret = -EIO;
  63                 if (ret < 0) {
  64                         dev_dbg(&priv->i2c->dev,
  65                                 "%s(): I2C transfer %d failed (%d)\n",
  66                                 __func__, i, ret);
  67                         return ret;
  68                 }
  69         }
  70         dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
  71                 __func__, (int) sizeof(status), status);
  72         if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
  73                 dev_err(&priv->i2c->dev,
  74                         "%s(): voltage in failure state, status reg 0x%x\n",
  75                         __func__, status[0]);
  76                 return -EIO;
  77         }
  78         return 0;
  79 }
  80
  81 static int lnbh25_set_voltage(struct dvb_frontend *fe,
  82                               enum fe_sec_voltage voltage)
  83 {
  84         int ret;
  85         u8 data1_reg;
  86         const char *vsel;
  87         struct lnbh25_priv *priv = fe->sec_priv;
  88         struct i2c_msg msg = {
  89                 .addr = priv->i2c_address,
  90                 .flags = 0,
  91                 .len = sizeof(priv->config),
  92                 .buf = priv->config
  93         };
  94
  95         switch (voltage) {
  96         case SEC_VOLTAGE_OFF:
  97                 data1_reg = 0x00;
  98                 vsel = "Off";
  99                 break;
 100         case SEC_VOLTAGE_13:
 101                 data1_reg = LNBH25_VSEL_13;
 102                 vsel = "13V";
 103                 break;
 104         case SEC_VOLTAGE_18:
 105                 data1_reg = LNBH25_VSEL_18;
 106                 vsel = "18V";
 107                 break;
 108         default:
 109                 return -EINVAL;
 110         }
 111         priv->config[1] = data1_reg;
 112         dev_dbg(&priv->i2c->dev,
 113                 "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
 114                 __func__, vsel, priv->i2c_address,
 115                 priv->config[0], priv->config[1], priv->config[2]);
 116         ret = i2c_transfer(priv->i2c, &msg, 1);
 117         if (ret >= 0 && ret != 1)
 118                 ret = -EIO;
 119         if (ret < 0) {
 120                 dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
 121                         __func__, ret);
 122                 return ret;
 123         }
 124         if (voltage != SEC_VOLTAGE_OFF) {
 125                 msleep(120);
 126                 ret = lnbh25_read_vmon(priv);
 127         } else {
 128                 msleep(20);
 129                 ret = 0;
 130         }
 131         return ret;
 132 }
 133
 134 static void lnbh25_release(struct dvb_frontend *fe)
 135 {
 136         struct lnbh25_priv *priv = fe->sec_priv;
 137
 138         dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
 139         lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
 140         kfree(fe->sec_priv);
 141         fe->sec_priv = NULL;
 142 }
 143
 144 struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
 145                                    struct lnbh25_config *cfg,
 146                                    struct i2c_adapter *i2c)
 147 {
 148         struct lnbh25_priv *priv;
 149
 150         dev_dbg(&i2c->dev, "%s()\n", __func__);
 151         priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
 152         if (!priv)
 153                 return NULL;
 154         priv->i2c_address = (cfg->i2c_address >> 1);
 155         priv->i2c = i2c;
 156         priv->config[0] = 0x02;
 157         priv->config[1] = 0x00;
 158         priv->config[2] = cfg->data2_config;
 159         fe->sec_priv = priv;
 160         if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 161                 dev_err(&i2c->dev,
 162                         "%s(): no LNBH25 found at I2C addr 0x%02x\n",
 163                         __func__, priv->i2c_address);
 164                 kfree(priv);
 165                 fe->sec_priv = NULL;
 166                 return NULL;
 167         }
 168
 169         fe->ops.release_sec = lnbh25_release;
 170         fe->ops.set_voltage = lnbh25_set_voltage;
 171
 172         dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
 173                 __func__, priv->i2c_address);
 174         return fe;
 175 }
 176 EXPORT_SYMBOL(lnbh25_attach);
 177
 178 MODULE_DESCRIPTION("ST LNBH25 driver");
 179 MODULE_AUTHOR("info@netup.ru");
 180 MODULE_LICENSE("GPL");