mirror of https://gitee.com/openkylin/linux.git
142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/*
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* isl6421.h - driver for lnb supply and control ic ISL6421
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*
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* Copyright (C) 2006 Andrew de Quincey
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* Copyright (C) 2006 Oliver Endriss
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
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*
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*
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* the project's page is at http://www.linuxtv.org
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*/
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include "dvb_frontend.h"
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#include "isl6421.h"
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struct isl6421 {
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u8 config;
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u8 override_or;
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u8 override_and;
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struct i2c_adapter *i2c;
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u8 i2c_addr;
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};
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static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
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{
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struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
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struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
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.buf = &isl6421->config,
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.len = sizeof(isl6421->config) };
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isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
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switch(voltage) {
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case SEC_VOLTAGE_OFF:
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break;
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case SEC_VOLTAGE_13:
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isl6421->config |= ISL6421_EN1;
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break;
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case SEC_VOLTAGE_18:
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isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
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break;
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default:
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return -EINVAL;
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}
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isl6421->config |= isl6421->override_or;
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isl6421->config &= isl6421->override_and;
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return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
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}
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static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
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{
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struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
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struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
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.buf = &isl6421->config,
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.len = sizeof(isl6421->config) };
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if (arg)
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isl6421->config |= ISL6421_LLC1;
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else
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isl6421->config &= ~ISL6421_LLC1;
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isl6421->config |= isl6421->override_or;
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isl6421->config &= isl6421->override_and;
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return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
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}
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static void isl6421_release(struct dvb_frontend *fe)
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{
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/* power off */
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isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
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/* free */
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kfree(fe->sec_priv);
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fe->sec_priv = NULL;
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}
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struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
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u8 override_set, u8 override_clear)
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{
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struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
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if (!isl6421)
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return NULL;
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/* default configuration */
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isl6421->config = ISL6421_ISEL1;
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isl6421->i2c = i2c;
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isl6421->i2c_addr = i2c_addr;
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fe->sec_priv = isl6421;
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/* bits which should be forced to '1' */
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isl6421->override_or = override_set;
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/* bits which should be forced to '0' */
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isl6421->override_and = ~override_clear;
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/* detect if it is present or not */
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if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
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kfree(isl6421);
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fe->sec_priv = NULL;
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return NULL;
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}
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/* install release callback */
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fe->ops.release_sec = isl6421_release;
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/* override frontend ops */
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fe->ops.set_voltage = isl6421_set_voltage;
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fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
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return fe;
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}
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EXPORT_SYMBOL(isl6421_attach);
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MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
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MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
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MODULE_LICENSE("GPL");
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