- 根目录:
- drivers
- media
- rc
- iguanair.c
/*
* IguanaWorks USB IR Transceiver support
*
* Copyright (C) 2012 Sean Young <sean@mess.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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 DRIVER_NAME "iguanair"
#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;
struct mutex lock;
/* 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[0];
};
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;
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) {
DEFINE_IR_RAW_EVENT(rawir);
unsigned i;
bool event = false;
init_ir_raw_event(&rawir);
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;
INIT_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;
}
if (ir->bufsize > BUF_SIZE) {
dev_info(ir->dev, "buffer size %u larger than expected\n",
ir->bufsize);
ir->bufsize = BUF_SIZE;
}
ir->packet->header.cmd = CMD_GET_FEATURES;
rc = iguanair_send(ir, sizeof(ir->packet->header));
if (rc)
dev_info(ir->dev, "failed to get features\n");
out:
return rc;
}
static int iguanair_receiver(struct iguanair *ir, bool enable)
{
ir->packet->header.start = 0;
ir->packet->header.direction = DIR_OUT;
ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
if (enable)
ir_raw_event_reset(ir->rc);
return iguanair_send(ir, sizeof(ir->packet->header));
}
/*
* The iguana ir creates the carrier by busy spinning after each pulse or
* space. This is counted in CPU cycles, with the CPU running at 24MHz. It is
* broken down into 7-cycles and 4-cyles delays, with a preference for
* 4-cycle delays.
*/
static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
{
struct iguanair *ir = dev->priv;
if (carrier < 25000 || carrier > 150000)
return -EINVAL;
mutex_lock(&ir->lock);
if (carrier != ir->carrier) {
uint32_t cycles, fours, sevens;
ir->carrier = carrier;
cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
ir->cycle_overhead;
/* make up the the remainer of 4-cycle blocks */
switch (cycles & 3) {
case 0:
sevens = 0;
break;
case 1:
sevens = 3;
break;
case 2:
sevens = 2;
break;
case 3:
sevens = 1;
break;
}
fours = (cycles - sevens * 7) / 4;
/* magic happens here */
ir->packet->busy7 = (4 - sevens) * 2;
ir->packet->busy4 = 110 - fours;
}
mutex_unlock(&ir->lock);
return carrier;
}
static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
{
struct iguanair *ir = dev->priv;
if (mask > 15)
return 4;
mutex_lock(&ir->lock);
ir->packet->channels = mask << 4;
mutex_unlock(&ir->lock);
return 0;
}
static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
{
struct iguanair *ir = dev->priv;
uint8_t space;
unsigned i, size, periods, bytes;
int rc;
mutex_lock(&ir->lock);
/* convert from us to carrier periods */
for (i = space = size = 0; i < count; i++) {
periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
bytes = DIV_ROUND_UP(periods, 127);
if (size + bytes > ir->bufsize) {
count = i;
break;
}
while (periods > 127) {
ir->packet->payload[size++] = 127 | space;
periods -= 127;
}
ir->packet->payload[size++] = periods | space;
space ^= 0x80;
}
if (count == 0) {
rc = -EINVAL;
goto out;
}
ir->packet->header.start = 0;
ir->packet->header.direction = DIR_OUT;
ir->packet->header.cmd = CMD_SEND;
ir->packet->length = size;
ir->tx_overflow = false;
rc = iguanair_send(ir, sizeof(*ir->packet) + size);
if (rc == 0 && ir->tx_overflow)
rc = -EOVERFLOW;
out:
mutex_unlock(&ir->lock);
return rc ? rc : count;
}
static int iguanair_open(struct rc_dev *rdev)
{
struct iguanair *ir = rdev->priv;
int rc;
mutex_lock(&ir->lock);
rc = iguanair_receiver(ir, true);
if (rc == 0)
ir->receiver_on = true;
mutex_unlock(&ir->lock);
return rc;
}
static void iguanair_close(struct rc_dev *rdev)
{
struct iguanair *ir = rdev->priv;
int rc;
mutex_lock(&ir->lock);
rc = iguanair_receiver(ir, false);
ir->receiver_on = false;
if (rc && rc != -ENODEV)
dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
mutex_unlock(&ir->lock);
}
static int iguanair_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct iguanair *ir;
struct rc_dev *rc;
int ret, pipein, pipeout;
struct usb_host_interface *idesc;
ir = kzalloc(sizeof(*ir), GFP_KERNEL);
rc = rc_allocate_device();
if (!ir || !rc) {
ret = -ENOMEM;
goto out;
}
ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
&ir->dma_in);
ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
&ir->dma_out);
ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
ret = -ENOMEM;
goto out;
}
idesc = intf->altsetting;
if (idesc->desc.bNumEndpoints < 2) {
ret = -ENODEV;
goto out;
}
ir->rc = rc;
ir->dev = &intf->dev;
ir->udev = udev;
mutex_init(&ir->lock);
init_completion(&ir->completion);
pipeout = usb_sndintpipe(udev,
idesc->endpoint[1].desc.bEndpointAddress);
usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
iguanair_irq_out, ir, 1);
ir->urb_out->transfer_dma = ir->dma_out;
ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
iguanair_rx, ir, 1);
ir->urb_in->transfer_dma = ir->dma_in;
ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
if (ret) {
dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
goto out;
}
ret = iguanair_get_features(ir);
if (ret)
goto out2;
snprintf(ir->name, sizeof(ir->name),
"IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
rc->input_name = ir->name;
rc->input_phys = ir->phys;
usb_to_input_id(ir->udev, &rc->input_id);
rc->dev.parent = &intf->dev;
rc->driver_type = RC_DRIVER_IR_RAW;
rc->allowed_protos = RC_BIT_ALL;
rc->priv = ir;
rc->open = iguanair_open;
rc->close = iguanair_close;
rc->s_tx_mask = iguanair_set_tx_mask;
rc->s_tx_carrier = iguanair_set_tx_carrier;
rc->tx_ir = iguanair_tx;
rc->driver_name = DRIVER_NAME;
rc->map_name = RC_MAP_RC6_MCE;
rc->timeout = MS_TO_NS(100);
rc->rx_resolution = RX_RESOLUTION;
iguanair_set_tx_carrier(rc, 38000);
iguanair_set_tx_mask(rc, 0);
ret = rc_register_device(rc);
if (ret < 0) {
dev_err(&intf->dev, "failed to register rc device %d", ret);
goto out2;
}
usb_set_intfdata(intf, ir);
return 0;
out2:
usb_kill_urb(ir->urb_in);
usb_kill_urb(ir->urb_out);
out:
if (ir) {
usb_free_urb(ir->urb_in);
usb_free_urb(ir->urb_out);
usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
ir->dma_out);
}
rc_free_device(rc);
kfree(ir);
return ret;
}
static void iguanair_disconnect(struct usb_interface *intf)
{
struct iguanair *ir = usb_get_intfdata(intf);
rc_unregister_device(ir->rc);
usb_set_intfdata(intf, NULL);
usb_kill_urb(ir->urb_in);
usb_kill_urb(ir->urb_out);
usb_free_urb(ir->urb_in);
usb_free_urb(ir->urb_out);
usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
kfree(ir);
}
static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
{
struct iguanair *ir = usb_get_intfdata(intf);
int rc = 0;
mutex_lock(&ir->lock);
if (ir->receiver_on) {
rc = iguanair_receiver(ir, false);
if (rc)
dev_warn(ir->dev, "failed to disable receiver for suspend\n");
}
usb_kill_urb(ir->urb_in);
usb_kill_urb(ir->urb_out);
mutex_unlock(&ir->lock);
return rc;
}
static int iguanair_resume(struct usb_interface *intf)
{
struct iguanair *ir = usb_get_intfdata(intf);
int rc = 0;
mutex_lock(&ir->lock);
rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
if (rc)
dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
if (ir->receiver_on) {
rc = iguanair_receiver(ir, true);
if (rc)
dev_warn(ir->dev, "failed to enable receiver after resume\n");
}
mutex_unlock(&ir->lock);
return rc;
}
static const struct usb_device_id iguanair_table[] = {
{ USB_DEVICE(0x1781, 0x0938) },
{ }
};
static struct usb_driver iguanair_driver = {
.name = DRIVER_NAME,
.probe = iguanair_probe,
.disconnect = iguanair_disconnect,
.suspend = iguanair_suspend,
.resume = iguanair_resume,
.reset_resume = iguanair_resume,
.id_table = iguanair_table,
.soft_unbind = 1 /* we want to disable receiver on unbind */
};
module_usb_driver(iguanair_driver);
MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
MODULE_AUTHOR("Sean Young <sean@mess.org>");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, iguanair_table);