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8b3179b721
The lirc core already introduces gaps, so there is no need for this in the driver. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
422 lines
10 KiB
C
422 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Streamzap Remote Control driver
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*
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* Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
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* Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
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*
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* This driver was based on the work of Greg Wickham and Adrian
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* Dewhurst. It was substantially rewritten to support correct signal
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* gaps and now maintains a delay buffer, which is used to present
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* consistent timing behaviour to user space applications. Without the
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* delay buffer an ugly hack would be required in lircd, which can
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* cause sluggish signal decoding in certain situations.
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*
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* Ported to in-kernel ir-core interface by Jarod Wilson
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*
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* This driver is based on the USB skeleton driver packaged with the
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* kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include <media/rc-core.h>
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#define DRIVER_NAME "streamzap"
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#define DRIVER_DESC "Streamzap Remote Control driver"
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#define USB_STREAMZAP_VENDOR_ID 0x0e9c
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#define USB_STREAMZAP_PRODUCT_ID 0x0000
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/* table of devices that work with this driver */
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static const struct usb_device_id streamzap_table[] = {
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/* Streamzap Remote Control */
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{ USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
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/* Terminating entry */
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{ }
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};
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MODULE_DEVICE_TABLE(usb, streamzap_table);
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#define SZ_PULSE_MASK 0xf0
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#define SZ_SPACE_MASK 0x0f
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#define SZ_TIMEOUT 0xff
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#define SZ_RESOLUTION 256
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/* number of samples buffered */
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#define SZ_BUF_LEN 128
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enum StreamzapDecoderState {
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PulseSpace,
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FullPulse,
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FullSpace,
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IgnorePulse
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};
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/* structure to hold our device specific stuff */
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struct streamzap_ir {
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/* ir-core */
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struct rc_dev *rdev;
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/* core device info */
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struct device *dev;
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/* usb */
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struct urb *urb_in;
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/* buffer & dma */
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unsigned char *buf_in;
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dma_addr_t dma_in;
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unsigned int buf_in_len;
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/* track what state we're in */
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enum StreamzapDecoderState decoder_state;
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char phys[64];
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};
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/* local function prototypes */
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static int streamzap_probe(struct usb_interface *interface,
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const struct usb_device_id *id);
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static void streamzap_disconnect(struct usb_interface *interface);
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static void streamzap_callback(struct urb *urb);
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static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
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static int streamzap_resume(struct usb_interface *intf);
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/* usb specific object needed to register this driver with the usb subsystem */
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static struct usb_driver streamzap_driver = {
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.name = DRIVER_NAME,
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.probe = streamzap_probe,
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.disconnect = streamzap_disconnect,
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.suspend = streamzap_suspend,
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.resume = streamzap_resume,
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.id_table = streamzap_table,
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};
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static void sz_push(struct streamzap_ir *sz, struct ir_raw_event rawir)
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{
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dev_dbg(sz->dev, "Storing %s with duration %u us\n",
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(rawir.pulse ? "pulse" : "space"), rawir.duration);
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ir_raw_event_store_with_filter(sz->rdev, &rawir);
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}
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static void sz_push_full_pulse(struct streamzap_ir *sz,
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unsigned char value)
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{
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struct ir_raw_event rawir = {
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.pulse = true,
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.duration = value * SZ_RESOLUTION + SZ_RESOLUTION / 2,
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};
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sz_push(sz, rawir);
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}
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static void sz_push_half_pulse(struct streamzap_ir *sz,
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unsigned char value)
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{
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sz_push_full_pulse(sz, (value & SZ_PULSE_MASK) >> 4);
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}
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static void sz_push_full_space(struct streamzap_ir *sz,
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unsigned char value)
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{
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struct ir_raw_event rawir = {
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.pulse = false,
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.duration = value * SZ_RESOLUTION + SZ_RESOLUTION / 2,
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};
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sz_push(sz, rawir);
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}
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static void sz_push_half_space(struct streamzap_ir *sz,
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unsigned long value)
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{
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sz_push_full_space(sz, value & SZ_SPACE_MASK);
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}
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/*
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* streamzap_callback - usb IRQ handler callback
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*
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* This procedure is invoked on reception of data from
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* the usb remote.
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*/
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static void streamzap_callback(struct urb *urb)
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{
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struct streamzap_ir *sz;
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unsigned int i;
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int len;
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if (!urb)
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return;
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sz = urb->context;
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len = urb->actual_length;
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switch (urb->status) {
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/*
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* this urb is terminated, clean up.
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* sz might already be invalid at this point
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*/
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dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
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return;
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default:
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break;
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}
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dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
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for (i = 0; i < len; i++) {
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dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n",
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i, (unsigned char)sz->buf_in[i]);
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switch (sz->decoder_state) {
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case PulseSpace:
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if ((sz->buf_in[i] & SZ_PULSE_MASK) ==
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SZ_PULSE_MASK) {
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sz->decoder_state = FullPulse;
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continue;
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} else if ((sz->buf_in[i] & SZ_SPACE_MASK)
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== SZ_SPACE_MASK) {
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sz_push_half_pulse(sz, sz->buf_in[i]);
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sz->decoder_state = FullSpace;
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continue;
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} else {
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sz_push_half_pulse(sz, sz->buf_in[i]);
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sz_push_half_space(sz, sz->buf_in[i]);
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}
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break;
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case FullPulse:
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sz_push_full_pulse(sz, sz->buf_in[i]);
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sz->decoder_state = IgnorePulse;
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break;
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case FullSpace:
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if (sz->buf_in[i] == SZ_TIMEOUT) {
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struct ir_raw_event rawir = {
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.pulse = false,
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.duration = sz->rdev->timeout
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};
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sz_push(sz, rawir);
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} else {
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sz_push_full_space(sz, sz->buf_in[i]);
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}
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sz->decoder_state = PulseSpace;
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break;
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case IgnorePulse:
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if ((sz->buf_in[i] & SZ_SPACE_MASK) ==
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SZ_SPACE_MASK) {
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sz->decoder_state = FullSpace;
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continue;
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}
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sz_push_half_space(sz, sz->buf_in[i]);
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sz->decoder_state = PulseSpace;
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break;
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}
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}
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ir_raw_event_handle(sz->rdev);
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usb_submit_urb(urb, GFP_ATOMIC);
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}
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static struct rc_dev *streamzap_init_rc_dev(struct streamzap_ir *sz,
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struct usb_device *usbdev)
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{
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struct rc_dev *rdev;
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struct device *dev = sz->dev;
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int ret;
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rdev = rc_allocate_device(RC_DRIVER_IR_RAW);
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if (!rdev)
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goto out;
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usb_make_path(usbdev, sz->phys, sizeof(sz->phys));
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strlcat(sz->phys, "/input0", sizeof(sz->phys));
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rdev->device_name = "Streamzap PC Remote Infrared Receiver";
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rdev->input_phys = sz->phys;
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usb_to_input_id(usbdev, &rdev->input_id);
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rdev->dev.parent = dev;
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rdev->priv = sz;
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rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
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rdev->driver_name = DRIVER_NAME;
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rdev->map_name = RC_MAP_STREAMZAP;
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rdev->rx_resolution = SZ_RESOLUTION;
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ret = rc_register_device(rdev);
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if (ret < 0) {
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dev_err(dev, "remote input device register failed\n");
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goto out;
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}
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return rdev;
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out:
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rc_free_device(rdev);
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return NULL;
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}
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/*
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* streamzap_probe
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*
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* Called by usb-core to associated with a candidate device
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* On any failure the return value is the ERROR
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* On success return 0
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*/
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static int streamzap_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *usbdev = interface_to_usbdev(intf);
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struct usb_endpoint_descriptor *endpoint;
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struct usb_host_interface *iface_host;
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struct streamzap_ir *sz = NULL;
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int retval = -ENOMEM;
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int pipe, maxp;
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/* Allocate space for device driver specific data */
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sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
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if (!sz)
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return -ENOMEM;
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/* Check to ensure endpoint information matches requirements */
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iface_host = intf->cur_altsetting;
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if (iface_host->desc.bNumEndpoints != 1) {
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dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
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__func__, iface_host->desc.bNumEndpoints);
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retval = -ENODEV;
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goto free_sz;
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}
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endpoint = &iface_host->endpoint[0].desc;
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if (!usb_endpoint_dir_in(endpoint)) {
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dev_err(&intf->dev, "%s: endpoint doesn't match input device 02%02x\n",
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__func__, endpoint->bEndpointAddress);
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retval = -ENODEV;
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goto free_sz;
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}
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if (!usb_endpoint_xfer_int(endpoint)) {
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dev_err(&intf->dev, "%s: endpoint attributes don't match xfer 02%02x\n",
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__func__, endpoint->bmAttributes);
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retval = -ENODEV;
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goto free_sz;
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}
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pipe = usb_rcvintpipe(usbdev, endpoint->bEndpointAddress);
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maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
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if (maxp == 0) {
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dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
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__func__);
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retval = -ENODEV;
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goto free_sz;
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}
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/* Allocate the USB buffer and IRQ URB */
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sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
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if (!sz->buf_in)
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goto free_sz;
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sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
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if (!sz->urb_in)
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goto free_buf_in;
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sz->dev = &intf->dev;
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sz->buf_in_len = maxp;
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sz->rdev = streamzap_init_rc_dev(sz, usbdev);
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if (!sz->rdev)
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goto rc_dev_fail;
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sz->decoder_state = PulseSpace;
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/* FIXME: don't yet have a way to set this */
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sz->rdev->timeout = SZ_TIMEOUT * SZ_RESOLUTION;
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#if 0
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/* not yet supported, depends on patches from maxim */
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/* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
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sz->min_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
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sz->max_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
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#endif
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/* Complete final initialisations */
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usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
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maxp, streamzap_callback, sz, endpoint->bInterval);
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sz->urb_in->transfer_dma = sz->dma_in;
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sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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usb_set_intfdata(intf, sz);
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if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
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dev_err(sz->dev, "urb submit failed\n");
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return 0;
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rc_dev_fail:
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usb_free_urb(sz->urb_in);
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free_buf_in:
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usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
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free_sz:
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kfree(sz);
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return retval;
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}
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/*
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* streamzap_disconnect
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*
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* Called by the usb core when the device is removed from the system.
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*
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* This routine guarantees that the driver will not submit any more urbs
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* by clearing dev->usbdev. It is also supposed to terminate any currently
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* active urbs. Unfortunately, usb_bulk_msg(), used in streamzap_read(),
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* does not provide any way to do this.
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*/
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static void streamzap_disconnect(struct usb_interface *interface)
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{
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struct streamzap_ir *sz = usb_get_intfdata(interface);
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struct usb_device *usbdev = interface_to_usbdev(interface);
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usb_set_intfdata(interface, NULL);
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if (!sz)
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return;
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rc_unregister_device(sz->rdev);
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usb_kill_urb(sz->urb_in);
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usb_free_urb(sz->urb_in);
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usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
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kfree(sz);
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}
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static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct streamzap_ir *sz = usb_get_intfdata(intf);
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usb_kill_urb(sz->urb_in);
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return 0;
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}
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static int streamzap_resume(struct usb_interface *intf)
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{
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struct streamzap_ir *sz = usb_get_intfdata(intf);
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if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
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dev_err(sz->dev, "Error submitting urb\n");
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return -EIO;
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}
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return 0;
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}
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module_usb_driver(streamzap_driver);
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MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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