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 */
 29struct 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
 40static 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
 81static 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
134static 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
144struct 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}
176EXPORT_SYMBOL_GPL(lnbh25_attach);
177
178MODULE_DESCRIPTION("ST LNBH25 driver");
179MODULE_AUTHOR("info@netup.ru");
180MODULE_LICENSE("GPL");