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|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Infrared Toy and IR Droid RC core driver
*
* Copyright (C) 2020 Sean Young <sean@mess.org>
*
* http://dangerousprototypes.com/docs/USB_IR_Toy:_Sampling_mode
*
* This driver is based on the lirc driver which can be found here:
* https://sourceforge.net/p/lirc/git/ci/master/tree/plugins/irtoy.c
* Copyright (C) 2011 Peter Kooiman <pkooiman@gmail.com>
*/
#include <asm/unaligned.h>
#include <linux/completion.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/usb/input.h>
#include <media/rc-core.h>
static const u8 COMMAND_VERSION[] = { 'v' };
// End transmit and repeat reset command so we exit sump mode
static const u8 COMMAND_RESET[] = { 0xff, 0xff, 0, 0, 0, 0, 0 };
static const u8 COMMAND_SMODE_ENTER[] = { 's' };
static const u8 COMMAND_SMODE_EXIT[] = { 0 };
static const u8 COMMAND_TXSTART[] = { 0x26, 0x24, 0x25, 0x03 };
#define REPLY_XMITCOUNT 't'
#define REPLY_XMITSUCCESS 'C'
#define REPLY_VERSION 'V'
#define REPLY_SAMPLEMODEPROTO 'S'
#define TIMEOUT 500
#define LEN_XMITRES 3
#define LEN_VERSION 4
#define LEN_SAMPLEMODEPROTO 3
#define MIN_FW_VERSION 20
#define UNIT_US 21
#define MAX_TIMEOUT_US (UNIT_US * U16_MAX)
#define MAX_PACKET 64
enum state {
STATE_IRDATA,
STATE_COMMAND_NO_RESP,
STATE_COMMAND,
STATE_TX,
};
struct irtoy {
struct device *dev;
struct usb_device *usbdev;
struct rc_dev *rc;
struct urb *urb_in, *urb_out;
u8 *in;
u8 *out;
struct completion command_done;
bool pulse;
enum state state;
void *tx_buf;
uint tx_len;
uint emitted;
uint hw_version;
uint sw_version;
uint proto_version;
char phys[64];
};
static void irtoy_response(struct irtoy *irtoy, u32 len)
{
switch (irtoy->state) {
case STATE_COMMAND:
if (len == LEN_VERSION && irtoy->in[0] == REPLY_VERSION) {
uint version;
irtoy->in[LEN_VERSION] = 0;
if (kstrtouint(irtoy->in + 1, 10, &version)) {
dev_err(irtoy->dev, "invalid version %*phN. Please make sure you are using firmware v20 or higher",
LEN_VERSION, irtoy->in);
break;
}
dev_dbg(irtoy->dev, "version %s\n", irtoy->in);
irtoy->hw_version = version / 100;
irtoy->sw_version = version % 100;
irtoy->state = STATE_IRDATA;
complete(&irtoy->command_done);
} else if (len == LEN_SAMPLEMODEPROTO &&
irtoy->in[0] == REPLY_SAMPLEMODEPROTO) {
uint version;
irtoy->in[LEN_SAMPLEMODEPROTO] = 0;
if (kstrtouint(irtoy->in + 1, 10, &version)) {
dev_err(irtoy->dev, "invalid sample mode response %*phN",
LEN_SAMPLEMODEPROTO, irtoy->in);
return;
}
dev_dbg(irtoy->dev, "protocol %s\n", irtoy->in);
irtoy->proto_version = version;
irtoy->state = STATE_IRDATA;
complete(&irtoy->command_done);
} else {
dev_err(irtoy->dev, "unexpected response to command: %*phN\n",
len, irtoy->in);
}
break;
case STATE_COMMAND_NO_RESP:
case STATE_IRDATA: {
struct ir_raw_event rawir = { .pulse = irtoy->pulse };
__be16 *in = (__be16 *)irtoy->in;
int i;
for (i = 0; i < len / sizeof(__be16); i++) {
u16 v = be16_to_cpu(in[i]);
if (v == 0xffff) {
rawir.pulse = false;
} else {
rawir.duration = v * UNIT_US;
ir_raw_event_store_with_timeout(irtoy->rc,
&rawir);
}
rawir.pulse = !rawir.pulse;
}
irtoy->pulse = rawir.pulse;
ir_raw_event_handle(irtoy->rc);
break;
}
case STATE_TX:
if (irtoy->tx_len == 0) {
if (len == LEN_XMITRES &&
irtoy->in[0] == REPLY_XMITCOUNT) {
u16 emitted = get_unaligned_be16(irtoy->in + 1);
dev_dbg(irtoy->dev, "emitted:%u\n", emitted);
irtoy->emitted = emitted;
} else if (len == 1 &&
irtoy->in[0] == REPLY_XMITSUCCESS) {
irtoy->state = STATE_IRDATA;
complete(&irtoy->command_done);
}
} else {
// send next part of tx buffer
uint space = irtoy->in[0];
uint buf_len;
int err;
if (len != 1 || space > MAX_PACKET || space == 0) {
dev_dbg(irtoy->dev, "packet length expected: %*phN\n",
len, irtoy->in);
break;
}
buf_len = min(space, irtoy->tx_len);
dev_dbg(irtoy->dev, "remaining:%u sending:%u\n",
irtoy->tx_len, buf_len);
memcpy(irtoy->out, irtoy->tx_buf, buf_len);
irtoy->urb_out->transfer_buffer_length = buf_len;
err = usb_submit_urb(irtoy->urb_out, GFP_ATOMIC);
if (err != 0) {
dev_err(irtoy->dev, "fail to submit tx buf urb: %d\n",
err);
irtoy->state = STATE_IRDATA;
complete(&irtoy->command_done);
break;
}
irtoy->tx_buf += buf_len;
irtoy->tx_len -= buf_len;
}
break;
}
}
static void irtoy_out_callback(struct urb *urb)
{
struct irtoy *irtoy = urb->context;
if (urb->status == 0) {
if (irtoy->state == STATE_COMMAND_NO_RESP)
complete(&irtoy->command_done);
} else {
dev_warn(irtoy->dev, "out urb status: %d\n", urb->status);
}
}
static void irtoy_in_callback(struct urb *urb)
{
struct irtoy *irtoy = urb->context;
int ret;
switch (urb->status) {
case 0:
irtoy_response(irtoy, urb->actual_length);
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
case -EPROTO:
case -EPIPE:
usb_unlink_urb(urb);
return;
default:
dev_dbg(irtoy->dev, "in urb status: %d\n", urb->status);
}
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret && ret != -ENODEV)
dev_warn(irtoy->dev, "failed to resubmit urb: %d\n", ret);
}
static int irtoy_command(struct irtoy *irtoy, const u8 *cmd, int cmd_len,
enum state state)
{
int err;
init_completion(&irtoy->command_done);
irtoy->state = state;
memcpy(irtoy->out, cmd, cmd_len);
irtoy->urb_out->transfer_buffer_length = cmd_len;
err = usb_submit_urb(irtoy->urb_out, GFP_KERNEL);
if (err != 0)
return err;
if (!wait_for_completion_timeout(&irtoy->command_done,
msecs_to_jiffies(TIMEOUT))) {
usb_kill_urb(irtoy->urb_out);
return -ETIMEDOUT;
}
return 0;
}
static int irtoy_setup(struct irtoy *irtoy)
{
int err;
err = irtoy_command(irtoy, COMMAND_RESET, sizeof(COMMAND_RESET),
STATE_COMMAND_NO_RESP);
if (err != 0) {
dev_err(irtoy->dev, "could not write reset command: %d\n",
err);
return err;
}
usleep_range(50, 50);
// get version
err = irtoy_command(irtoy, COMMAND_VERSION, sizeof(COMMAND_VERSION),
STATE_COMMAND);
if (err) {
dev_err(irtoy->dev, "could not write version command: %d\n",
err);
return err;
}
// enter sample mode
err = irtoy_command(irtoy, COMMAND_SMODE_ENTER,
sizeof(COMMAND_SMODE_ENTER), STATE_COMMAND);
if (err)
dev_err(irtoy->dev, "could not write sample command: %d\n",
err);
return err;
}
/*
* When sending IR, it is imperative that we send the IR data as quickly
* as possible to the device, so it does not run out of IR data and
* introduce gaps. Allocate the buffer here, and then feed the data from
* the urb callback handler.
*/
static int irtoy_tx(struct rc_dev *rc, uint *txbuf, uint count)
{
struct irtoy *irtoy = rc->priv;
unsigned int i, size;
__be16 *buf;
int err;
size = sizeof(u16) * (count + 1);
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
return -ENOMEM;
for (i = 0; i < count; i++) {
u16 v = DIV_ROUND_CLOSEST(txbuf[i], UNIT_US);
if (!v)
v = 1;
buf[i] = cpu_to_be16(v);
}
buf[count] = cpu_to_be16(0xffff);
irtoy->tx_buf = buf;
irtoy->tx_len = size;
irtoy->emitted = 0;
// There is an issue where if the unit is receiving IR while the
// first TXSTART command is sent, the device might end up hanging
// with its led on. It does not respond to any command when this
// happens. To work around this, re-enter sample mode.
err = irtoy_command(irtoy, COMMAND_SMODE_EXIT,
sizeof(COMMAND_SMODE_EXIT), STATE_COMMAND_NO_RESP);
if (err) {
dev_err(irtoy->dev, "exit sample mode: %d\n", err);
return err;
}
err = irtoy_command(irtoy, COMMAND_SMODE_ENTER,
sizeof(COMMAND_SMODE_ENTER), STATE_COMMAND);
if (err) {
dev_err(irtoy->dev, "enter sample mode: %d\n", err);
return err;
}
err = irtoy_command(irtoy, COMMAND_TXSTART, sizeof(COMMAND_TXSTART),
STATE_TX);
kfree(buf);
if (err) {
dev_err(irtoy->dev, "failed to send tx start command: %d\n",
err);
// not sure what state the device is in, reset it
irtoy_setup(irtoy);
return err;
}
if (size != irtoy->emitted) {
dev_err(irtoy->dev, "expected %u emitted, got %u\n", size,
irtoy->emitted);
// not sure what state the device is in, reset it
irtoy_setup(irtoy);
return -EINVAL;
}
return count;
}
static int irtoy_tx_carrier(struct rc_dev *rc, uint32_t carrier)
{
struct irtoy *irtoy = rc->priv;
u8 buf[3];
int err;
if (carrier < 11800)
return -EINVAL;
buf[0] = 0x06;
buf[1] = DIV_ROUND_CLOSEST(48000000, 16 * carrier) - 1;
buf[2] = 0;
err = irtoy_command(irtoy, buf, sizeof(buf), STATE_COMMAND_NO_RESP);
if (err)
dev_err(irtoy->dev, "could not write carrier command: %d\n",
err);
return err;
}
static int irtoy_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_host_interface *idesc = intf->cur_altsetting;
struct usb_device *usbdev = interface_to_usbdev(intf);
struct usb_endpoint_descriptor *ep_in = NULL;
struct usb_endpoint_descriptor *ep_out = NULL;
struct usb_endpoint_descriptor *ep = NULL;
struct irtoy *irtoy;
struct rc_dev *rc;
struct urb *urb;
int i, pipe, err = -ENOMEM;
for (i = 0; i < idesc->desc.bNumEndpoints; i++) {
ep = &idesc->endpoint[i].desc;
if (!ep_in && usb_endpoint_is_bulk_in(ep) &&
usb_endpoint_maxp(ep) == MAX_PACKET)
ep_in = ep;
if (!ep_out && usb_endpoint_is_bulk_out(ep) &&
usb_endpoint_maxp(ep) == MAX_PACKET)
ep_out = ep;
}
if (!ep_in || !ep_out) {
dev_err(&intf->dev, "required endpoints not found\n");
return -ENODEV;
}
irtoy = kzalloc(sizeof(*irtoy), GFP_KERNEL);
if (!irtoy)
return -ENOMEM;
irtoy->in = kmalloc(MAX_PACKET, GFP_KERNEL);
if (!irtoy->in)
goto free_irtoy;
irtoy->out = kmalloc(MAX_PACKET, GFP_KERNEL);
if (!irtoy->out)
goto free_irtoy;
rc = rc_allocate_device(RC_DRIVER_IR_RAW);
if (!rc)
goto free_irtoy;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
goto free_rcdev;
pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress);
usb_fill_bulk_urb(urb, usbdev, pipe, irtoy->in, MAX_PACKET,
irtoy_in_callback, irtoy);
irtoy->urb_in = urb;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
goto free_rcdev;
pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress);
usb_fill_bulk_urb(urb, usbdev, pipe, irtoy->out, MAX_PACKET,
irtoy_out_callback, irtoy);
irtoy->dev = &intf->dev;
irtoy->usbdev = usbdev;
irtoy->rc = rc;
irtoy->urb_out = urb;
irtoy->pulse = true;
err = usb_submit_urb(irtoy->urb_in, GFP_KERNEL);
if (err != 0) {
dev_err(irtoy->dev, "fail to submit in urb: %d\n", err);
return err;
}
err = irtoy_setup(irtoy);
if (err)
goto free_rcdev;
dev_info(irtoy->dev, "version: hardware %u, firmware %u.%u, protocol %u",
irtoy->hw_version, irtoy->sw_version / 10,
irtoy->sw_version % 10, irtoy->proto_version);
if (irtoy->sw_version < MIN_FW_VERSION) {
dev_err(irtoy->dev, "need firmware V%02u or higher",
MIN_FW_VERSION);
err = -ENODEV;
goto free_rcdev;
}
usb_make_path(usbdev, irtoy->phys, sizeof(irtoy->phys));
rc->device_name = "Infrared Toy";
rc->driver_name = KBUILD_MODNAME;
rc->input_phys = irtoy->phys;
usb_to_input_id(usbdev, &rc->input_id);
rc->dev.parent = &intf->dev;
rc->priv = irtoy;
rc->tx_ir = irtoy_tx;
rc->s_tx_carrier = irtoy_tx_carrier;
rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
rc->map_name = RC_MAP_RC6_MCE;
rc->rx_resolution = UNIT_US;
rc->timeout = IR_DEFAULT_TIMEOUT;
/*
* end of transmission is detected by absence of a usb packet
* with more pulse/spaces. However, each usb packet sent can
* contain 32 pulse/spaces, which can be quite lengthy, so there
* can be a delay between usb packets. For example with nec there is a
* 17ms gap between packets.
*
* So, make timeout a largish minimum which works with most protocols.
*/
rc->min_timeout = MS_TO_US(40);
rc->max_timeout = MAX_TIMEOUT_US;
err = rc_register_device(rc);
if (err)
goto free_rcdev;
usb_set_intfdata(intf, irtoy);
return 0;
free_rcdev:
usb_kill_urb(irtoy->urb_out);
usb_free_urb(irtoy->urb_out);
usb_kill_urb(irtoy->urb_in);
usb_free_urb(irtoy->urb_in);
rc_free_device(rc);
free_irtoy:
kfree(irtoy->in);
kfree(irtoy->out);
kfree(irtoy);
return err;
}
static void irtoy_disconnect(struct usb_interface *intf)
{
struct irtoy *ir = usb_get_intfdata(intf);
rc_unregister_device(ir->rc);
usb_set_intfdata(intf, NULL);
usb_kill_urb(ir->urb_out);
usb_free_urb(ir->urb_out);
usb_kill_urb(ir->urb_in);
usb_free_urb(ir->urb_in);
kfree(ir->in);
kfree(ir->out);
kfree(ir);
}
static const struct usb_device_id irtoy_table[] = {
{ USB_DEVICE_INTERFACE_CLASS(0x04d8, 0xfd08, USB_CLASS_CDC_DATA) },
{ USB_DEVICE_INTERFACE_CLASS(0x04d8, 0xf58b, USB_CLASS_CDC_DATA) },
{ }
};
static struct usb_driver irtoy_driver = {
.name = KBUILD_MODNAME,
.probe = irtoy_probe,
.disconnect = irtoy_disconnect,
.id_table = irtoy_table,
};
module_usb_driver(irtoy_driver);
MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_DESCRIPTION("Infrared Toy and IR Droid driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, irtoy_table);
|