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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IguanaWorks USB IR Transceiver support
*
* Copyright (C) 2012 Sean Young <sean@mess.org>
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <media/rc-core.h>
#define BUF_SIZE 152
struct iguanair {
struct rc_dev *rc;
struct device *dev;
struct usb_device *udev;
uint16_t version;
uint8_t bufsize;
uint8_t cycle_overhead;
/* receiver support */
bool receiver_on;
dma_addr_t dma_in, dma_out;
uint8_t *buf_in;
struct urb *urb_in, *urb_out;
struct completion completion;
/* transmit support */
bool tx_overflow;
uint32_t carrier;
struct send_packet *packet;
char name[64];
char phys[64];
};
#define CMD_NOP 0x00
#define CMD_GET_VERSION 0x01
#define CMD_GET_BUFSIZE 0x11
#define CMD_GET_FEATURES 0x10
#define CMD_SEND 0x15
#define CMD_EXECUTE 0x1f
#define CMD_RX_OVERFLOW 0x31
#define CMD_TX_OVERFLOW 0x32
#define CMD_RECEIVER_ON 0x12
#define CMD_RECEIVER_OFF 0x14
#define DIR_IN 0xdc
#define DIR_OUT 0xcd
#define MAX_IN_PACKET 8u
#define MAX_OUT_PACKET (sizeof(struct send_packet) + BUF_SIZE)
#define TIMEOUT 1000
#define RX_RESOLUTION 21333
struct packet {
uint16_t start;
uint8_t direction;
uint8_t cmd;
};
struct send_packet {
struct packet header;
uint8_t length;
uint8_t channels;
uint8_t busy7;
uint8_t busy4;
uint8_t payload[];
};
static void process_ir_data(struct iguanair *ir, unsigned len)
{
if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
switch (ir->buf_in[3]) {
case CMD_GET_VERSION:
if (len == 6) {
ir->version = (ir->buf_in[5] << 8) |
ir->buf_in[4];
complete(&ir->completion);
}
break;
case CMD_GET_BUFSIZE:
if (len >= 5) {
ir->bufsize = ir->buf_in[4];
complete(&ir->completion);
}
break;
case CMD_GET_FEATURES:
if (len > 5) {
ir->cycle_overhead = ir->buf_in[5];
complete(&ir->completion);
}
break;
case CMD_TX_OVERFLOW:
ir->tx_overflow = true;
/* fall through */
case CMD_RECEIVER_OFF:
case CMD_RECEIVER_ON:
case CMD_SEND:
complete(&ir->completion);
break;
case CMD_RX_OVERFLOW:
dev_warn(ir->dev, "receive overflow\n");
ir_raw_event_reset(ir->rc);
break;
default:
dev_warn(ir->dev, "control code %02x received\n",
ir->buf_in[3]);
break;
}
} else if (len >= 7) {
struct ir_raw_event rawir = {};
unsigned i;
bool event = false;
for (i = 0; i < 7; i++) {
if (ir->buf_in[i] == 0x80) {
rawir.pulse = false;
rawir.duration = US_TO_NS(21845);
} else {
rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
RX_RESOLUTION;
}
if (ir_raw_event_store_with_filter(ir->rc, &rawir))
event = true;
}
if (event)
ir_raw_event_handle(ir->rc);
}
}
static void iguanair_rx(struct urb *urb)
{
struct iguanair *ir;
int rc;
if (!urb)
return;
ir = urb->context;
if (!ir) {
usb_unlink_urb(urb);
return;
}
switch (urb->status) {
case 0:
process_ir_data(ir, urb->actual_length);
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
usb_unlink_urb(urb);
return;
case -EPIPE:
default:
dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
break;
}
rc = usb_submit_urb(urb, GFP_ATOMIC);
if (rc && rc != -ENODEV)
dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
}
static void iguanair_irq_out(struct urb *urb)
{
struct iguanair *ir = urb->context;
if (urb->status)
dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
/* if we sent an nop packet, do not expect a response */
if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
complete(&ir->completion);
}
static int iguanair_send(struct iguanair *ir, unsigned size)
{
int rc;
reinit_completion(&ir->completion);
ir->urb_out->transfer_buffer_length = size;
rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
if (rc)
return rc;
if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
return -ETIMEDOUT;
return rc;
}
static int iguanair_get_features(struct iguanair *ir)
{
int rc;
/*
* On cold boot, the iguanair initializes on the first packet
* received but does not process that packet. Send an empty
* packet.
*/
ir->packet->header.start = 0;
ir->packet->header.direction = DIR_OUT;
ir->packet->header.cmd = CMD_NOP;
iguanair_send(ir, sizeof(ir->packet->header));
ir->packet->header.cmd = CMD_GET_VERSION;
rc = iguanair_send(ir, sizeof(ir->packet->header));
if (rc) {
dev_info(ir->dev, "failed to get version\n");
goto out;
}
if (ir->version < 0x205) {
dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
rc = -ENODEV;
goto out;
}
ir->bufsize = 150;
ir->cycle_overhead = 65;
ir->packet->header.cmd = CMD_GET_BUFSIZE;
rc = iguanair_send(ir, sizeof(ir->packet->header));
if (rc) {
dev_info(ir->dev, "failed to get buffer size\n");
goto out;
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