mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
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b820c2cf0e
An IR reset is only used when the IR hardware reports an error. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
569 lines
13 KiB
C
569 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IguanaWorks USB IR Transceiver support
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*
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* Copyright (C) 2012 Sean Young <sean@mess.org>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include <media/rc-core.h>
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#define BUF_SIZE 152
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struct iguanair {
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struct rc_dev *rc;
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struct device *dev;
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struct usb_device *udev;
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uint16_t version;
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uint8_t bufsize;
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uint8_t cycle_overhead;
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/* receiver support */
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bool receiver_on;
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dma_addr_t dma_in, dma_out;
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uint8_t *buf_in;
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struct urb *urb_in, *urb_out;
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struct completion completion;
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/* transmit support */
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bool tx_overflow;
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uint32_t carrier;
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struct send_packet *packet;
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char name[64];
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char phys[64];
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};
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#define CMD_NOP 0x00
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#define CMD_GET_VERSION 0x01
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#define CMD_GET_BUFSIZE 0x11
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#define CMD_GET_FEATURES 0x10
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#define CMD_SEND 0x15
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#define CMD_EXECUTE 0x1f
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#define CMD_RX_OVERFLOW 0x31
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#define CMD_TX_OVERFLOW 0x32
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#define CMD_RECEIVER_ON 0x12
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#define CMD_RECEIVER_OFF 0x14
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#define DIR_IN 0xdc
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#define DIR_OUT 0xcd
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#define MAX_IN_PACKET 8u
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#define MAX_OUT_PACKET (sizeof(struct send_packet) + BUF_SIZE)
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#define TIMEOUT 1000
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#define RX_RESOLUTION 21
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struct packet {
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uint16_t start;
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uint8_t direction;
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uint8_t cmd;
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};
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struct send_packet {
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struct packet header;
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uint8_t length;
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uint8_t channels;
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uint8_t busy7;
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uint8_t busy4;
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uint8_t payload[];
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};
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static void process_ir_data(struct iguanair *ir, unsigned len)
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{
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if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
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switch (ir->buf_in[3]) {
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case CMD_GET_VERSION:
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if (len == 6) {
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ir->version = (ir->buf_in[5] << 8) |
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ir->buf_in[4];
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complete(&ir->completion);
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}
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break;
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case CMD_GET_BUFSIZE:
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if (len >= 5) {
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ir->bufsize = ir->buf_in[4];
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complete(&ir->completion);
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}
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break;
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case CMD_GET_FEATURES:
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if (len > 5) {
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ir->cycle_overhead = ir->buf_in[5];
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complete(&ir->completion);
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}
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break;
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case CMD_TX_OVERFLOW:
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ir->tx_overflow = true;
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fallthrough;
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case CMD_RECEIVER_OFF:
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case CMD_RECEIVER_ON:
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case CMD_SEND:
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complete(&ir->completion);
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break;
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case CMD_RX_OVERFLOW:
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dev_warn(ir->dev, "receive overflow\n");
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ir_raw_event_reset(ir->rc);
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break;
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default:
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dev_warn(ir->dev, "control code %02x received\n",
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ir->buf_in[3]);
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break;
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}
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} else if (len >= 7) {
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struct ir_raw_event rawir = {};
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unsigned i;
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bool event = false;
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for (i = 0; i < 7; i++) {
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if (ir->buf_in[i] == 0x80) {
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rawir.pulse = false;
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rawir.duration = 21845;
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} else {
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rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
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rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
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RX_RESOLUTION;
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}
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if (ir_raw_event_store_with_filter(ir->rc, &rawir))
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event = true;
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}
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if (event)
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ir_raw_event_handle(ir->rc);
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}
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}
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static void iguanair_rx(struct urb *urb)
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{
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struct iguanair *ir;
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int rc;
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if (!urb)
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return;
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ir = urb->context;
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if (!ir) {
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usb_unlink_urb(urb);
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return;
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}
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switch (urb->status) {
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case 0:
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process_ir_data(ir, urb->actual_length);
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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usb_unlink_urb(urb);
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return;
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case -EPIPE:
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default:
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dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
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break;
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}
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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if (rc && rc != -ENODEV)
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dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
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}
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static void iguanair_irq_out(struct urb *urb)
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{
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struct iguanair *ir = urb->context;
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if (urb->status)
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dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
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/* if we sent an nop packet, do not expect a response */
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if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
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complete(&ir->completion);
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}
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static int iguanair_send(struct iguanair *ir, unsigned size)
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{
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int rc;
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reinit_completion(&ir->completion);
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ir->urb_out->transfer_buffer_length = size;
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rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
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if (rc)
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return rc;
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if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
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return -ETIMEDOUT;
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return rc;
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}
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static int iguanair_get_features(struct iguanair *ir)
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{
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int rc;
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/*
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* On cold boot, the iguanair initializes on the first packet
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* received but does not process that packet. Send an empty
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* packet.
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*/
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ir->packet->header.start = 0;
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ir->packet->header.direction = DIR_OUT;
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ir->packet->header.cmd = CMD_NOP;
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iguanair_send(ir, sizeof(ir->packet->header));
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ir->packet->header.cmd = CMD_GET_VERSION;
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rc = iguanair_send(ir, sizeof(ir->packet->header));
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if (rc) {
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dev_info(ir->dev, "failed to get version\n");
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goto out;
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}
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if (ir->version < 0x205) {
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dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
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rc = -ENODEV;
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goto out;
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}
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ir->bufsize = 150;
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ir->cycle_overhead = 65;
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ir->packet->header.cmd = CMD_GET_BUFSIZE;
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rc = iguanair_send(ir, sizeof(ir->packet->header));
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if (rc) {
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dev_info(ir->dev, "failed to get buffer size\n");
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goto out;
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}
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if (ir->bufsize > BUF_SIZE) {
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dev_info(ir->dev, "buffer size %u larger than expected\n",
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ir->bufsize);
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ir->bufsize = BUF_SIZE;
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}
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ir->packet->header.cmd = CMD_GET_FEATURES;
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rc = iguanair_send(ir, sizeof(ir->packet->header));
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if (rc)
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dev_info(ir->dev, "failed to get features\n");
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out:
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return rc;
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}
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static int iguanair_receiver(struct iguanair *ir, bool enable)
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{
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ir->packet->header.start = 0;
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ir->packet->header.direction = DIR_OUT;
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ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
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return iguanair_send(ir, sizeof(ir->packet->header));
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}
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/*
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* The iguanair creates the carrier by busy spinning after each half period.
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* This is counted in CPU cycles, with the CPU running at 24MHz. It is
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* broken down into 7-cycles and 4-cyles delays, with a preference for
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* 4-cycle delays, minus the overhead of the loop itself (cycle_overhead).
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*/
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static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
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{
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struct iguanair *ir = dev->priv;
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if (carrier < 25000 || carrier > 150000)
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return -EINVAL;
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if (carrier != ir->carrier) {
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uint32_t cycles, fours, sevens;
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ir->carrier = carrier;
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cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
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ir->cycle_overhead;
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/*
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* Calculate minimum number of 7 cycles needed so
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* we are left with a multiple of 4; so we want to have
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* (sevens * 7) & 3 == cycles & 3
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*/
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sevens = (4 - cycles) & 3;
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fours = (cycles - sevens * 7) / 4;
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/*
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* The firmware interprets these values as a relative offset
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* for a branch. Immediately following the branches, there
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* 4 instructions of 7 cycles (2 bytes each) and 110
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* instructions of 4 cycles (1 byte each). A relative branch
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* of 0 will execute all of them, branch further for less
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* cycle burning.
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*/
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ir->packet->busy7 = (4 - sevens) * 2;
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ir->packet->busy4 = 110 - fours;
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}
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return 0;
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}
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static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
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{
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struct iguanair *ir = dev->priv;
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if (mask > 15)
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return 4;
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ir->packet->channels = mask << 4;
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return 0;
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}
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static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
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{
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struct iguanair *ir = dev->priv;
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unsigned int i, size, p, periods;
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int rc;
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/* convert from us to carrier periods */
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for (i = size = 0; i < count; i++) {
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periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
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while (periods) {
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p = min(periods, 127u);
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if (size >= ir->bufsize) {
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rc = -EINVAL;
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goto out;
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}
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ir->packet->payload[size++] = p | ((i & 1) ? 0x80 : 0);
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periods -= p;
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}
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}
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ir->packet->header.start = 0;
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ir->packet->header.direction = DIR_OUT;
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ir->packet->header.cmd = CMD_SEND;
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ir->packet->length = size;
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ir->tx_overflow = false;
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rc = iguanair_send(ir, sizeof(*ir->packet) + size);
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if (rc == 0 && ir->tx_overflow)
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rc = -EOVERFLOW;
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out:
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return rc ? rc : count;
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}
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static int iguanair_open(struct rc_dev *rdev)
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{
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struct iguanair *ir = rdev->priv;
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int rc;
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rc = iguanair_receiver(ir, true);
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if (rc == 0)
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ir->receiver_on = true;
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return rc;
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}
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static void iguanair_close(struct rc_dev *rdev)
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{
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struct iguanair *ir = rdev->priv;
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int rc;
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rc = iguanair_receiver(ir, false);
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ir->receiver_on = false;
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if (rc && rc != -ENODEV)
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dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
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}
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static int iguanair_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 *udev = interface_to_usbdev(intf);
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struct iguanair *ir;
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struct rc_dev *rc;
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int ret, pipein, pipeout;
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struct usb_host_interface *idesc;
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idesc = intf->cur_altsetting;
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if (idesc->desc.bNumEndpoints < 2)
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return -ENODEV;
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ir = kzalloc(sizeof(*ir), GFP_KERNEL);
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rc = rc_allocate_device(RC_DRIVER_IR_RAW);
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if (!ir || !rc) {
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ret = -ENOMEM;
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goto out;
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}
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ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
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&ir->dma_in);
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ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
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&ir->dma_out);
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ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
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ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
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if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out ||
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!usb_endpoint_is_int_in(&idesc->endpoint[0].desc) ||
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!usb_endpoint_is_int_out(&idesc->endpoint[1].desc)) {
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ret = -ENOMEM;
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goto out;
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}
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ir->rc = rc;
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ir->dev = &intf->dev;
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ir->udev = udev;
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init_completion(&ir->completion);
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pipeout = usb_sndintpipe(udev,
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idesc->endpoint[1].desc.bEndpointAddress);
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usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
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iguanair_irq_out, ir, 1);
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ir->urb_out->transfer_dma = ir->dma_out;
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ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
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usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
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iguanair_rx, ir, 1);
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ir->urb_in->transfer_dma = ir->dma_in;
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ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
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if (ret) {
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dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
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goto out;
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}
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ret = iguanair_get_features(ir);
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if (ret)
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goto out2;
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snprintf(ir->name, sizeof(ir->name),
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"IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
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usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
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rc->device_name = ir->name;
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rc->input_phys = ir->phys;
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usb_to_input_id(ir->udev, &rc->input_id);
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rc->dev.parent = &intf->dev;
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rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
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rc->priv = ir;
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rc->open = iguanair_open;
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rc->close = iguanair_close;
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rc->s_tx_mask = iguanair_set_tx_mask;
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rc->s_tx_carrier = iguanair_set_tx_carrier;
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rc->tx_ir = iguanair_tx;
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rc->driver_name = KBUILD_MODNAME;
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rc->map_name = RC_MAP_RC6_MCE;
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rc->min_timeout = 1;
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rc->timeout = IR_DEFAULT_TIMEOUT;
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rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
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rc->rx_resolution = RX_RESOLUTION;
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iguanair_set_tx_carrier(rc, 38000);
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iguanair_set_tx_mask(rc, 0);
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ret = rc_register_device(rc);
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if (ret < 0) {
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dev_err(&intf->dev, "failed to register rc device %d", ret);
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goto out2;
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}
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usb_set_intfdata(intf, ir);
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return 0;
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out2:
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usb_kill_urb(ir->urb_in);
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usb_kill_urb(ir->urb_out);
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out:
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if (ir) {
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usb_free_urb(ir->urb_in);
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usb_free_urb(ir->urb_out);
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usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
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usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
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ir->dma_out);
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}
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rc_free_device(rc);
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kfree(ir);
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return ret;
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}
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static void iguanair_disconnect(struct usb_interface *intf)
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{
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struct iguanair *ir = usb_get_intfdata(intf);
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rc_unregister_device(ir->rc);
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usb_set_intfdata(intf, NULL);
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usb_kill_urb(ir->urb_in);
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usb_kill_urb(ir->urb_out);
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usb_free_urb(ir->urb_in);
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usb_free_urb(ir->urb_out);
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usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
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usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
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kfree(ir);
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}
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static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct iguanair *ir = usb_get_intfdata(intf);
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int rc = 0;
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if (ir->receiver_on) {
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rc = iguanair_receiver(ir, false);
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if (rc)
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dev_warn(ir->dev, "failed to disable receiver for suspend\n");
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|
}
|
|
|
|
usb_kill_urb(ir->urb_in);
|
|
usb_kill_urb(ir->urb_out);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int iguanair_resume(struct usb_interface *intf)
|
|
{
|
|
struct iguanair *ir = usb_get_intfdata(intf);
|
|
int rc;
|
|
|
|
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");
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct usb_device_id iguanair_table[] = {
|
|
{ USB_DEVICE(0x1781, 0x0938) },
|
|
{ }
|
|
};
|
|
|
|
static struct usb_driver iguanair_driver = {
|
|
.name = KBUILD_MODNAME,
|
|
.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);
|
|
|