media/dvb-frontends/lnbp21.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * lnbp21.c - driver for lnb supply and control ic lnbp21
0004  *
0005  * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
0006  * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
0007  *
0008  * the project's page is at https://linuxtv.org
0009  */
0010 #include <linux/delay.h>
0011 #include <linux/errno.h>
0012 #include <linux/init.h>
0013 #include <linux/kernel.h>
0014 #include <linux/module.h>
0015 #include <linux/string.h>
0016 #include <linux/slab.h>
0017
0018 #include <media/dvb_frontend.h>
0019 #include "lnbp21.h"
0020 #include "lnbh24.h"
0021
0022 struct lnbp21 {
0023     u8          config;
0024     u8          override_or;
0025     u8          override_and;
0026     struct i2c_adapter  *i2c;
0027     u8          i2c_addr;
0028 };
0029
0030 static int lnbp21_set_voltage(struct dvb_frontend *fe,
0031                   enum fe_sec_voltage voltage)
0032 {
0033     struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
0034     struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
0035                 .buf = &lnbp21->config,
0036                 .len = sizeof(lnbp21->config) };
0037
0038     lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
0039
0040     switch(voltage) {
0041     case SEC_VOLTAGE_OFF:
0042         break;
0043     case SEC_VOLTAGE_13:
0044         lnbp21->config |= LNBP21_EN;
0045         break;
0046     case SEC_VOLTAGE_18:
0047         lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
0048         break;
0049     default:
0050         return -EINVAL;
0051     }
0052
0053     lnbp21->config |= lnbp21->override_or;
0054     lnbp21->config &= lnbp21->override_and;
0055
0056     return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
0057 }
0058
0059 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
0060 {
0061     struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
0062     struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
0063                 .buf = &lnbp21->config,
0064                 .len = sizeof(lnbp21->config) };
0065
0066     if (arg)
0067         lnbp21->config |= LNBP21_LLC;
0068     else
0069         lnbp21->config &= ~LNBP21_LLC;
0070
0071     lnbp21->config |= lnbp21->override_or;
0072     lnbp21->config &= lnbp21->override_and;
0073
0074     return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
0075 }
0076
0077 static int lnbp21_set_tone(struct dvb_frontend *fe,
0078                enum fe_sec_tone_mode tone)
0079 {
0080     struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
0081     struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
0082                 .buf = &lnbp21->config,
0083                 .len = sizeof(lnbp21->config) };
0084
0085     switch (tone) {
0086     case SEC_TONE_OFF:
0087         lnbp21->config &= ~LNBP21_TEN;
0088         break;
0089     case SEC_TONE_ON:
0090         lnbp21->config |= LNBP21_TEN;
0091         break;
0092     default:
0093         return -EINVAL;
0094     }
0095
0096     lnbp21->config |= lnbp21->override_or;
0097     lnbp21->config &= lnbp21->override_and;
0098
0099     return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
0100 }
0101
0102 static void lnbp21_release(struct dvb_frontend *fe)
0103 {
0104     /* LNBP power off */
0105     lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
0106
0107     /* free data */
0108     kfree(fe->sec_priv);
0109     fe->sec_priv = NULL;
0110 }
0111
0112 static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
0113                 struct i2c_adapter *i2c, u8 override_set,
0114                 u8 override_clear, u8 i2c_addr, u8 config)
0115 {
0116     struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
0117     if (!lnbp21)
0118         return NULL;
0119
0120     /* default configuration */
0121     lnbp21->config = config;
0122     lnbp21->i2c = i2c;
0123     lnbp21->i2c_addr = i2c_addr;
0124     fe->sec_priv = lnbp21;
0125
0126     /* bits which should be forced to '1' */
0127     lnbp21->override_or = override_set;
0128
0129     /* bits which should be forced to '0' */
0130     lnbp21->override_and = ~override_clear;
0131
0132     /* detect if it is present or not */
0133     if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
0134         kfree(lnbp21);
0135         return NULL;
0136     }
0137
0138     /* install release callback */
0139     fe->ops.release_sec = lnbp21_release;
0140
0141     /* override frontend ops */
0142     fe->ops.set_voltage = lnbp21_set_voltage;
0143     fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
0144     if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
0145         fe->ops.set_tone = lnbp21_set_tone;
0146     printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
0147
0148     return fe;
0149 }
0150
0151 struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
0152                 struct i2c_adapter *i2c, u8 override_set,
0153                 u8 override_clear, u8 i2c_addr)
0154 {
0155     return lnbx2x_attach(fe, i2c, override_set, override_clear,
0156                             i2c_addr, LNBH24_TTX);
0157 }
0158 EXPORT_SYMBOL(lnbh24_attach);
0159
0160 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
0161                 struct i2c_adapter *i2c, u8 override_set,
0162                 u8 override_clear)
0163 {
0164     return lnbx2x_attach(fe, i2c, override_set, override_clear,
0165                             0x08, LNBP21_ISEL);
0166 }
0167 EXPORT_SYMBOL(lnbp21_attach);
0168
0169 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
0170 MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
0171 MODULE_LICENSE("GPL");