lnbp22.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * lnbp22.h - driver for lnb supply and control ic lnbp22
  4 *
  5 * Copyright (C) 2006 Dominik Kuhlen
  6 * Based on lnbp21 driver
  7 *
  8 * the project's page is at https://linuxtv.org
  9 */
 10#include <linux/delay.h>
 11#include <linux/errno.h>
 12#include <linux/init.h>
 13#include <linux/kernel.h>
 14#include <linux/module.h>
 15#include <linux/moduleparam.h>
 16#include <linux/string.h>
 17#include <linux/slab.h>
 18
 19#include <media/dvb_frontend.h>
 20#include "lnbp22.h"
 21
 22static int debug;
 23module_param(debug, int, 0644);
 24MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
 25
 26
 27#define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
 28
 29struct lnbp22 {
 30	u8		    config[4];
 31	struct i2c_adapter *i2c;
 32};
 33
 34static int lnbp22_set_voltage(struct dvb_frontend *fe,
 35			      enum fe_sec_voltage voltage)
 36{
 37	struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
 38	struct i2c_msg msg = {
 39		.addr = 0x08,
 40		.flags = 0,
 41		.buf = (char *)&lnbp22->config,
 42		.len = sizeof(lnbp22->config),
 43	};
 44
 45	dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage,
 46	       SEC_VOLTAGE_18, SEC_VOLTAGE_13);
 47
 48	lnbp22->config[3] = 0x60; /* Power down */
 49	switch (voltage) {
 50	case SEC_VOLTAGE_OFF:
 51		break;
 52	case SEC_VOLTAGE_13:
 53		lnbp22->config[3] |= LNBP22_EN;
 54		break;
 55	case SEC_VOLTAGE_18:
 56		lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL);
 57		break;
 58	default:
 59		return -EINVAL;
 60	}
 61
 62	dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]);
 63	return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
 64}
 65
 66static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
 67{
 68	struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
 69	struct i2c_msg msg = {
 70		.addr = 0x08,
 71		.flags = 0,
 72		.buf = (char *)&lnbp22->config,
 73		.len = sizeof(lnbp22->config),
 74	};
 75
 76	dprintk(1, "%s: %d\n", __func__, (int)arg);
 77	if (arg)
 78		lnbp22->config[3] |= LNBP22_LLC;
 79	else
 80		lnbp22->config[3] &= ~LNBP22_LLC;
 81
 82	return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
 83}
 84
 85static void lnbp22_release(struct dvb_frontend *fe)
 86{
 87	dprintk(1, "%s\n", __func__);
 88	/* LNBP power off */
 89	lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
 90
 91	/* free data */
 92	kfree(fe->sec_priv);
 93	fe->sec_priv = NULL;
 94}
 95
 96struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe,
 97					struct i2c_adapter *i2c)
 98{
 99	struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL);
100	if (!lnbp22)
101		return NULL;
102
103	/* default configuration */
104	lnbp22->config[0] = 0x00; /* ? */
105	lnbp22->config[1] = 0x28; /* ? */
106	lnbp22->config[2] = 0x48; /* ? */
107	lnbp22->config[3] = 0x60; /* Power down */
108	lnbp22->i2c = i2c;
109	fe->sec_priv = lnbp22;
110
111	/* detect if it is present or not */
112	if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
113		dprintk(0, "%s LNBP22 not found\n", __func__);
114		kfree(lnbp22);
115		fe->sec_priv = NULL;
116		return NULL;
117	}
118
119	/* install release callback */
120	fe->ops.release_sec = lnbp22_release;
121
122	/* override frontend ops */
123	fe->ops.set_voltage = lnbp22_set_voltage;
124	fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
125
126	return fe;
127}
128EXPORT_SYMBOL_GPL(lnbp22_attach);
129
130MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
131MODULE_AUTHOR("Dominik Kuhlen");
132MODULE_LICENSE("GPL");