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