// SPDX-License-Identifier: GPL-2.0+
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// handle au0828 IR remotes via linux kernel input layer.
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//
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// Copyright (c) 2014 Mauro Carvalho Chehab <mchehab@samsung.com>
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// Copyright (c) 2014 Samsung Electronics Co., Ltd.
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//
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// Based on em28xx-input.c.
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#include "au0828.h"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include <media/rc-core.h>
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static int disable_ir;
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module_param(disable_ir, int, 0444);
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MODULE_PARM_DESC(disable_ir, "disable infrared remote support");
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struct au0828_rc {
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struct au0828_dev *dev;
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struct rc_dev *rc;
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char name[32];
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char phys[32];
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/* poll decoder */
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int polling;
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struct delayed_work work;
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/* i2c slave address of external device (if used) */
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u16 i2c_dev_addr;
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int (*get_key_i2c)(struct au0828_rc *ir);
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};
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/*
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* AU8522 has a builtin IR receiver. Add functions to get IR from it
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*/
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static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data)
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{
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int rc;
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char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };
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struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0,
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.buf = buf, .len = sizeof(buf) };
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rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1);
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if (rc < 0)
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return rc;
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return (rc == 1) ? 0 : -EIO;
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}
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static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val,
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char *buf, int size)
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{
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int rc;
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char obuf[3];
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struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0,
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.buf = obuf, .len = 2 },
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{ .addr = ir->i2c_dev_addr, .flags = I2C_M_RD,
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.buf = buf, .len = size } };
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obuf[0] = 0x40 | reg >> 8;
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obuf[1] = reg & 0xff;
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if (val >= 0) {
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obuf[2] = val;
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msg[0].len++;
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}
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rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2);
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if (rc < 0)
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return rc;
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return (rc == 2) ? 0 : -EIO;
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}
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static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value)
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{
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int rc;
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char buf, oldbuf;
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rc = au8522_rc_read(ir, reg, -1, &buf, 1);
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if (rc < 0)
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return rc;
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oldbuf = buf;
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buf = (buf & ~mask) | (value & mask);
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/* Nothing to do, just return */
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if (buf == oldbuf)
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return 0;
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return au8522_rc_write(ir, reg, buf);
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}
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#define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit))
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#define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0)
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/* Remote Controller time units */
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#define AU8522_UNIT 200 /* us */
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#define NEC_START_SPACE (4500 / AU8522_UNIT)
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#define NEC_START_PULSE (563 * 16)
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#define RC5_START_SPACE (4 * AU8522_UNIT)
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#define RC5_START_PULSE 889
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static int au0828_get_key_au8522(struct au0828_rc *ir)
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{
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unsigned char buf[40];
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struct ir_raw_event rawir = {};
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int i, j, rc;
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int prv_bit, bit, width;
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bool first = true;
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/* do nothing if device is disconnected */
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if (test_bit(DEV_DISCONNECTED, &ir->dev->dev_state))
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return 0;
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/* Check IR int */
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rc = au8522_rc_read(ir, 0xe1, -1, buf, 1);
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if (rc < 0 || !(buf[0] & (1 << 4))) {
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/* Be sure that IR is enabled */
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au8522_rc_set(ir, 0xe0, 1 << 4);
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return 0;
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}
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/* Something arrived. Get the data */
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rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf));
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if (rc < 0)
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return rc;
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/* Disable IR */
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au8522_rc_clear(ir, 0xe0, 1 << 4);
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/* Enable IR */
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au8522_rc_set(ir, 0xe0, 1 << 4);
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dprintk(16, "RC data received: %*ph\n", 40, buf);
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prv_bit = (buf[0] >> 7) & 0x01;
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width = 0;
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for (i = 0; i < sizeof(buf); i++) {
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for (j = 7; j >= 0; j--) {
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bit = (buf[i] >> j) & 0x01;
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if (bit == prv_bit) {
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width++;
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continue;
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}
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/*
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* Fix an au8522 bug: the first pulse event
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* is lost. So, we need to fake it, based on the
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* protocol. That means that not all raw decoders
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* will work, as we need to add a hack for each
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* protocol, based on the first space.
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* So, we only support RC5 and NEC.
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*/
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if (first) {
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first = false;
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rawir.pulse = true;
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if (width > NEC_START_SPACE - 2 &&
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width < NEC_START_SPACE + 2) {
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/* NEC protocol */
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rawir.duration = NEC_START_PULSE;
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dprintk(16, "Storing NEC start %s with duration %d",
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rawir.pulse ? "pulse" : "space",
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rawir.duration);
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} else {
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/* RC5 protocol */
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rawir.duration = RC5_START_PULSE;
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dprintk(16, "Storing RC5 start %s with duration %d",
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rawir.pulse ? "pulse" : "space",
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rawir.duration);
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}
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ir_raw_event_store(ir->rc, &rawir);
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}
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rawir.pulse = prv_bit ? false : true;
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rawir.duration = AU8522_UNIT * width;
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dprintk(16, "Storing %s with duration %d",
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rawir.pulse ? "pulse" : "space",
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rawir.duration);
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ir_raw_event_store(ir->rc, &rawir);
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width = 1;
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prv_bit = bit;
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}
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}
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rawir.pulse = prv_bit ? false : true;
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rawir.duration = AU8522_UNIT * width;
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dprintk(16, "Storing end %s with duration %d",
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rawir.pulse ? "pulse" : "space",
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rawir.duration);
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ir_raw_event_store(ir->rc, &rawir);
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ir_raw_event_handle(ir->rc);
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return 1;
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}
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/*
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* Generic IR code
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*/
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static void au0828_rc_work(struct work_struct *work)
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{
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struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work);
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int rc;
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rc = ir->get_key_i2c(ir);
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if (rc < 0)
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pr_info("Error while getting RC scancode\n");
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schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
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}
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static int au0828_rc_start(struct rc_dev *rc)
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{
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struct au0828_rc *ir = rc->priv;
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INIT_DELAYED_WORK(&ir->work, au0828_rc_work);
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/* Enable IR */
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au8522_rc_set(ir, 0xe0, 1 << 4);
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schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
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return 0;
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}
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static void au0828_rc_stop(struct rc_dev *rc)
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{
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struct au0828_rc *ir = rc->priv;
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cancel_delayed_work_sync(&ir->work);
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/* do nothing if device is disconnected */
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if (!test_bit(DEV_DISCONNECTED, &ir->dev->dev_state)) {
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/* Disable IR */
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au8522_rc_clear(ir, 0xe0, 1 << 4);
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}
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}
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static int au0828_probe_i2c_ir(struct au0828_dev *dev)
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{
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int i = 0;
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static const unsigned short addr_list[] = {
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0x47, I2C_CLIENT_END
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};
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while (addr_list[i] != I2C_CLIENT_END) {
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if (i2c_probe_func_quick_read(dev->i2c_client.adapter,
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addr_list[i]) == 1)
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return addr_list[i];
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i++;
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}
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return -ENODEV;
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}
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int au0828_rc_register(struct au0828_dev *dev)
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{
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struct au0828_rc *ir;
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struct rc_dev *rc;
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int err = -ENOMEM;
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u16 i2c_rc_dev_addr = 0;
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if (!dev->board.has_ir_i2c || disable_ir)
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return 0;
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i2c_rc_dev_addr = au0828_probe_i2c_ir(dev);
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if (!i2c_rc_dev_addr)
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return -ENODEV;
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ir = kzalloc(sizeof(*ir), GFP_KERNEL);
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rc = rc_allocate_device(RC_DRIVER_IR_RAW);
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if (!ir || !rc)
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goto error;
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/* record handles to ourself */
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ir->dev = dev;
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dev->ir = ir;
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ir->rc = rc;
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rc->priv = ir;
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rc->open = au0828_rc_start;
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rc->close = au0828_rc_stop;
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if (dev->board.has_ir_i2c) { /* external i2c device */
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switch (dev->boardnr) {
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case AU0828_BOARD_HAUPPAUGE_HVR950Q:
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rc->map_name = RC_MAP_HAUPPAUGE;
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ir->get_key_i2c = au0828_get_key_au8522;
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break;
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default:
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err = -ENODEV;
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goto error;
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}
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ir->i2c_dev_addr = i2c_rc_dev_addr;
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}
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/* This is how often we ask the chip for IR information */
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ir->polling = 100; /* ms */
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/* init input device */
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snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)",
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dev->board.name);
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usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys));
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strlcat(ir->phys, "/input0", sizeof(ir->phys));
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rc->device_name = ir->name;
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rc->input_phys = ir->phys;
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rc->input_id.bustype = BUS_USB;
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rc->input_id.version = 1;
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rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor);
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rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct);
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rc->dev.parent = &dev->usbdev->dev;
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rc->driver_name = "au0828-input";
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rc->allowed_protocols = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
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RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC5;
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/* all done */
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err = rc_register_device(rc);
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if (err)
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goto error;
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pr_info("Remote controller %s initialized\n", ir->name);
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return 0;
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error:
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dev->ir = NULL;
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rc_free_device(rc);
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kfree(ir);
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return err;
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}
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void au0828_rc_unregister(struct au0828_dev *dev)
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{
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struct au0828_rc *ir = dev->ir;
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/* skip detach on non attached boards */
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if (!ir)
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return;
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rc_unregister_device(ir->rc);
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/* done */
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kfree(ir);
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dev->ir = NULL;
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}
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int au0828_rc_suspend(struct au0828_dev *dev)
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{
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struct au0828_rc *ir = dev->ir;
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if (!ir)
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return 0;
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pr_info("Stopping RC\n");
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cancel_delayed_work_sync(&ir->work);
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/* Disable IR */
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au8522_rc_clear(ir, 0xe0, 1 << 4);
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return 0;
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}
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int au0828_rc_resume(struct au0828_dev *dev)
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{
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struct au0828_rc *ir = dev->ir;
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if (!ir)
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return 0;
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pr_info("Restarting RC\n");
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/* Enable IR */
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au8522_rc_set(ir, 0xe0, 1 << 4);
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schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
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return 0;
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}
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