media/dvb-frontends/lnbh25.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * lnbh25.c
0004  *
0005  * Driver for LNB supply and control IC LNBH25
0006  *
0007  * Copyright (C) 2014 NetUP Inc.
0008  * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
0009  * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
0010  */
0011
0012 #include <linux/module.h>
0013 #include <linux/init.h>
0014 #include <linux/string.h>
0015 #include <linux/slab.h>
0016
0017 #include <media/dvb_frontend.h>
0018 #include "lnbh25.h"
0019
0020 /**
0021  * struct lnbh25_priv - LNBH25 driver private data
0022  * @i2c:        pointer to the I2C adapter structure
0023  * @i2c_address:    I2C address of LNBH25 SEC chip
0024  * @config:     Registers configuration:
0025  *          offset 0: 1st register address, always 0x02 (DATA1)
0026  *          offset 1: DATA1 register value
0027  *          offset 2: DATA2 register value
0028  */
0029 struct lnbh25_priv {
0030     struct i2c_adapter  *i2c;
0031     u8          i2c_address;
0032     u8          config[3];
0033 };
0034
0035 #define LNBH25_STATUS_OFL   0x1
0036 #define LNBH25_STATUS_VMON  0x4
0037 #define LNBH25_VSEL_13      0x03
0038 #define LNBH25_VSEL_18      0x0a
0039
0040 static int lnbh25_read_vmon(struct lnbh25_priv *priv)
0041 {
0042     int i, ret;
0043     u8 addr = 0x00;
0044     u8 status[6];
0045     struct i2c_msg msg[2] = {
0046         {
0047             .addr = priv->i2c_address,
0048             .flags = 0,
0049             .len = 1,
0050             .buf = &addr
0051         }, {
0052             .addr = priv->i2c_address,
0053             .flags = I2C_M_RD,
0054             .len = sizeof(status),
0055             .buf = status
0056         }
0057     };
0058
0059     for (i = 0; i < 2; i++) {
0060         ret = i2c_transfer(priv->i2c, &msg[i], 1);
0061         if (ret >= 0 && ret != 1)
0062             ret = -EIO;
0063         if (ret < 0) {
0064             dev_dbg(&priv->i2c->dev,
0065                 "%s(): I2C transfer %d failed (%d)\n",
0066                 __func__, i, ret);
0067             return ret;
0068         }
0069     }
0070     dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
0071         __func__, (int) sizeof(status), status);
0072     if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
0073         dev_err(&priv->i2c->dev,
0074             "%s(): voltage in failure state, status reg 0x%x\n",
0075             __func__, status[0]);
0076         return -EIO;
0077     }
0078     return 0;
0079 }
0080
0081 static int lnbh25_set_voltage(struct dvb_frontend *fe,
0082                   enum fe_sec_voltage voltage)
0083 {
0084     int ret;
0085     u8 data1_reg;
0086     const char *vsel;
0087     struct lnbh25_priv *priv = fe->sec_priv;
0088     struct i2c_msg msg = {
0089         .addr = priv->i2c_address,
0090         .flags = 0,
0091         .len = sizeof(priv->config),
0092         .buf = priv->config
0093     };
0094
0095     switch (voltage) {
0096     case SEC_VOLTAGE_OFF:
0097         data1_reg = 0x00;
0098         vsel = "Off";
0099         break;
0100     case SEC_VOLTAGE_13:
0101         data1_reg = LNBH25_VSEL_13;
0102         vsel = "13V";
0103         break;
0104     case SEC_VOLTAGE_18:
0105         data1_reg = LNBH25_VSEL_18;
0106         vsel = "18V";
0107         break;
0108     default:
0109         return -EINVAL;
0110     }
0111     priv->config[1] = data1_reg;
0112     dev_dbg(&priv->i2c->dev,
0113         "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
0114         __func__, vsel, priv->i2c_address,
0115         priv->config[0], priv->config[1], priv->config[2]);
0116     ret = i2c_transfer(priv->i2c, &msg, 1);
0117     if (ret >= 0 && ret != 1)
0118         ret = -EIO;
0119     if (ret < 0) {
0120         dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
0121             __func__, ret);
0122         return ret;
0123     }
0124     if (voltage != SEC_VOLTAGE_OFF) {
0125         msleep(120);
0126         ret = lnbh25_read_vmon(priv);
0127     } else {
0128         msleep(20);
0129         ret = 0;
0130     }
0131     return ret;
0132 }
0133
0134 static void lnbh25_release(struct dvb_frontend *fe)
0135 {
0136     struct lnbh25_priv *priv = fe->sec_priv;
0137
0138     dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
0139     lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF);
0140     kfree(fe->sec_priv);
0141     fe->sec_priv = NULL;
0142 }
0143
0144 struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe,
0145                    struct lnbh25_config *cfg,
0146                    struct i2c_adapter *i2c)
0147 {
0148     struct lnbh25_priv *priv;
0149
0150     dev_dbg(&i2c->dev, "%s()\n", __func__);
0151     priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
0152     if (!priv)
0153         return NULL;
0154     priv->i2c_address = (cfg->i2c_address >> 1);
0155     priv->i2c = i2c;
0156     priv->config[0] = 0x02;
0157     priv->config[1] = 0x00;
0158     priv->config[2] = cfg->data2_config;
0159     fe->sec_priv = priv;
0160     if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
0161         dev_err(&i2c->dev,
0162             "%s(): no LNBH25 found at I2C addr 0x%02x\n",
0163             __func__, priv->i2c_address);
0164         kfree(priv);
0165         fe->sec_priv = NULL;
0166         return NULL;
0167     }
0168
0169     fe->ops.release_sec = lnbh25_release;
0170     fe->ops.set_voltage = lnbh25_set_voltage;
0171
0172     dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
0173         __func__, priv->i2c_address);
0174     return fe;
0175 }
0176 EXPORT_SYMBOL(lnbh25_attach);
0177
0178 MODULE_DESCRIPTION("ST LNBH25 driver");
0179 MODULE_AUTHOR("info@netup.ru");
0180 MODULE_LICENSE("GPL");