mirror of https://gitee.com/openkylin/linux.git
221 lines
5.1 KiB
C
221 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* the project's page is at https://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 <media/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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bool is_off;
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};
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static int isl6421_set_voltage(struct dvb_frontend *fe,
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enum fe_sec_voltage voltage)
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{
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int ret;
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u8 buf;
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bool is_off;
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struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
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struct i2c_msg msg[2] = {
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{
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.addr = isl6421->i2c_addr,
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.flags = 0,
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.buf = &isl6421->config,
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.len = 1,
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}, {
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.addr = isl6421->i2c_addr,
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.flags = I2C_M_RD,
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.buf = &buf,
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.len = 1,
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}
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};
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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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is_off = true;
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break;
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case SEC_VOLTAGE_13:
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is_off = false;
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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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is_off = false;
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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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/*
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* If LNBf were not powered on, disable dynamic current limit, as,
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* according with datasheet, highly capacitive load on the output may
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* cause a difficult start-up.
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*/
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if (isl6421->is_off && !is_off)
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isl6421->config |= ISL6421_DCL;
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isl6421->config |= isl6421->override_or;
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isl6421->config &= isl6421->override_and;
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ret = i2c_transfer(isl6421->i2c, msg, 2);
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if (ret < 0)
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return ret;
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if (ret != 2)
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return -EIO;
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/* Store off status now in case future commands fail */
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isl6421->is_off = is_off;
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/* On overflow, the device will try again after 900 ms (typically) */
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if (!is_off && (buf & ISL6421_OLF1))
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msleep(1000);
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/* Re-enable dynamic current limit */
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if ((isl6421->config & ISL6421_DCL) &&
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!(isl6421->override_or & ISL6421_DCL)) {
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isl6421->config &= ~ISL6421_DCL;
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ret = i2c_transfer(isl6421->i2c, msg, 2);
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if (ret < 0)
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return ret;
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if (ret != 2)
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return -EIO;
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}
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/* Check if overload flag is active. If so, disable power */
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if (!is_off && (buf & ISL6421_OLF1)) {
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isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
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ret = i2c_transfer(isl6421->i2c, msg, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EIO;
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isl6421->is_off = true;
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dev_warn(&isl6421->i2c->dev,
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"Overload current detected. disabling LNBf power\n");
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return -EINVAL;
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}
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return 0;
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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 int isl6421_set_tone(struct dvb_frontend *fe,
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enum fe_sec_tone_mode tone)
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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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switch (tone) {
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case SEC_TONE_ON:
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isl6421->config |= ISL6421_ENT1;
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break;
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case SEC_TONE_OFF:
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isl6421->config &= ~ISL6421_ENT1;
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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 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, bool override_tone)
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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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isl6421->is_off = true;
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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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if (override_tone)
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fe->ops.set_tone = isl6421_set_tone;
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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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