lnbp21.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * lnbp21.c - driver for lnb supply and control ic lnbp21
  4 *
  5 * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
  6 * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
  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/string.h>
 16#include <linux/slab.h>
 17
 18#include <media/dvb_frontend.h>
 19#include "lnbp21.h"
 20#include "lnbh24.h"
 21
 22struct lnbp21 {
 23	u8			config;
 24	u8			override_or;
 25	u8			override_and;
 26	struct i2c_adapter	*i2c;
 27	u8			i2c_addr;
 28};
 29
 30static int lnbp21_set_voltage(struct dvb_frontend *fe,
 31			      enum fe_sec_voltage voltage)
 32{
 33	struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
 34	struct i2c_msg msg = {	.addr = lnbp21->i2c_addr, .flags = 0,
 35				.buf = &lnbp21->config,
 36				.len = sizeof(lnbp21->config) };
 37
 38	lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
 39
 40	switch(voltage) {
 41	case SEC_VOLTAGE_OFF:
 42		break;
 43	case SEC_VOLTAGE_13:
 44		lnbp21->config |= LNBP21_EN;
 45		break;
 46	case SEC_VOLTAGE_18:
 47		lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
 48		break;
 49	default:
 50		return -EINVAL;
 51	}
 52
 53	lnbp21->config |= lnbp21->override_or;
 54	lnbp21->config &= lnbp21->override_and;
 55
 56	return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
 57}
 58
 59static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
 60{
 61	struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
 62	struct i2c_msg msg = {	.addr = lnbp21->i2c_addr, .flags = 0,
 63				.buf = &lnbp21->config,
 64				.len = sizeof(lnbp21->config) };
 65
 66	if (arg)
 67		lnbp21->config |= LNBP21_LLC;
 68	else
 69		lnbp21->config &= ~LNBP21_LLC;
 70
 71	lnbp21->config |= lnbp21->override_or;
 72	lnbp21->config &= lnbp21->override_and;
 73
 74	return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
 75}
 76
 77static int lnbp21_set_tone(struct dvb_frontend *fe,
 78			   enum fe_sec_tone_mode tone)
 79{
 80	struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
 81	struct i2c_msg msg = {	.addr = lnbp21->i2c_addr, .flags = 0,
 82				.buf = &lnbp21->config,
 83				.len = sizeof(lnbp21->config) };
 84
 85	switch (tone) {
 86	case SEC_TONE_OFF:
 87		lnbp21->config &= ~LNBP21_TEN;
 88		break;
 89	case SEC_TONE_ON:
 90		lnbp21->config |= LNBP21_TEN;
 91		break;
 92	default:
 93		return -EINVAL;
 94	}
 95
 96	lnbp21->config |= lnbp21->override_or;
 97	lnbp21->config &= lnbp21->override_and;
 98
 99	return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
100}
101
102static void lnbp21_release(struct dvb_frontend *fe)
103{
104	/* LNBP power off */
105	lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
106
107	/* free data */
108	kfree(fe->sec_priv);
109	fe->sec_priv = NULL;
110}
111
112static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
113				struct i2c_adapter *i2c, u8 override_set,
114				u8 override_clear, u8 i2c_addr, u8 config)
115{
116	struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
117	if (!lnbp21)
118		return NULL;
119
120	/* default configuration */
121	lnbp21->config = config;
122	lnbp21->i2c = i2c;
123	lnbp21->i2c_addr = i2c_addr;
124	fe->sec_priv = lnbp21;
125
126	/* bits which should be forced to '1' */
127	lnbp21->override_or = override_set;
128
129	/* bits which should be forced to '0' */
130	lnbp21->override_and = ~override_clear;
131
132	/* detect if it is present or not */
133	if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
134		kfree(lnbp21);
135		return NULL;
136	}
137
138	/* install release callback */
139	fe->ops.release_sec = lnbp21_release;
140
141	/* override frontend ops */
142	fe->ops.set_voltage = lnbp21_set_voltage;
143	fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
144	if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
145		fe->ops.set_tone = lnbp21_set_tone;
146	printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
147
148	return fe;
149}
150
151struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
152				struct i2c_adapter *i2c, u8 override_set,
153				u8 override_clear, u8 i2c_addr)
154{
155	return lnbx2x_attach(fe, i2c, override_set, override_clear,
156							i2c_addr, LNBH24_TTX);
157}
158EXPORT_SYMBOL_GPL(lnbh24_attach);
159
160struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
161				struct i2c_adapter *i2c, u8 override_set,
162				u8 override_clear)
163{
164	return lnbx2x_attach(fe, i2c, override_set, override_clear,
165							0x08, LNBP21_ISEL);
166}
167EXPORT_SYMBOL_GPL(lnbp21_attach);
168
169MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
170MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
171MODULE_LICENSE("GPL");