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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * IgorPlug-USB IR Receiver4 *5 * Copyright (C) 2014 Sean Young <sean@mess.org>6 *7 * Supports the standard homebrew IgorPlugUSB receiver with Igor's firmware.8 * See http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm9 *10 * Based on the lirc_igorplugusb.c driver:11 * Copyright (C) 2004 Jan M. Hochstein12 * <hochstein@algo.informatik.tu-darmstadt.de>13 */14#include <linux/device.h>15#include <linux/kernel.h>16#include <linux/module.h>17#include <linux/usb.h>18#include <linux/usb/input.h>19#include <media/rc-core.h>20 21#define DRIVER_DESC "IgorPlug-USB IR Receiver"22#define DRIVER_NAME "igorplugusb"23 24#define HEADERLEN 325#define BUFLEN 3626#define MAX_PACKET (HEADERLEN + BUFLEN)27 28#define SET_INFRABUFFER_EMPTY 129#define GET_INFRACODE 230 31 32struct igorplugusb {33 struct rc_dev *rc;34 struct device *dev;35 36 struct urb *urb;37 struct usb_ctrlrequest request;38 39 struct timer_list timer;40 41 u8 *buf_in;42 43 char phys[64];44};45 46static void igorplugusb_cmd(struct igorplugusb *ir, int cmd);47 48static void igorplugusb_irdata(struct igorplugusb *ir, unsigned len)49{50 struct ir_raw_event rawir = {};51 unsigned i, start, overflow;52 53 dev_dbg(ir->dev, "irdata: %*ph (len=%u)", len, ir->buf_in, len);54 55 /*56 * If more than 36 pulses and spaces follow each other, the igorplugusb57 * overwrites its buffer from the beginning. The overflow value is the58 * last offset which was not overwritten. Everything from this offset59 * onwards occurred before everything until this offset.60 */61 overflow = ir->buf_in[2];62 i = start = overflow + HEADERLEN;63 64 if (start >= len) {65 dev_err(ir->dev, "receive overflow invalid: %u", overflow);66 } else {67 if (overflow > 0) {68 dev_warn(ir->dev, "receive overflow, at least %u lost",69 overflow);70 ir_raw_event_overflow(ir->rc);71 }72 73 do {74 rawir.duration = ir->buf_in[i] * 85;75 rawir.pulse = i & 1;76 77 ir_raw_event_store_with_filter(ir->rc, &rawir);78 79 if (++i == len)80 i = HEADERLEN;81 } while (i != start);82 83 /* add a trailing space */84 rawir.duration = ir->rc->timeout;85 rawir.pulse = false;86 ir_raw_event_store_with_filter(ir->rc, &rawir);87 88 ir_raw_event_handle(ir->rc);89 }90 91 igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);92}93 94static void igorplugusb_callback(struct urb *urb)95{96 struct usb_ctrlrequest *req;97 struct igorplugusb *ir = urb->context;98 99 req = (struct usb_ctrlrequest *)urb->setup_packet;100 101 switch (urb->status) {102 case 0:103 if (req->bRequest == GET_INFRACODE &&104 urb->actual_length > HEADERLEN)105 igorplugusb_irdata(ir, urb->actual_length);106 else /* request IR */107 mod_timer(&ir->timer, jiffies + msecs_to_jiffies(50));108 break;109 case -EPROTO:110 case -ECONNRESET:111 case -ENOENT:112 case -ESHUTDOWN:113 return;114 default:115 dev_warn(ir->dev, "Error: urb status = %d\n", urb->status);116 igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);117 break;118 }119}120 121static void igorplugusb_cmd(struct igorplugusb *ir, int cmd)122{123 int ret;124 125 ir->request.bRequest = cmd;126 ir->urb->transfer_flags = 0;127 ret = usb_submit_urb(ir->urb, GFP_ATOMIC);128 if (ret && ret != -EPERM)129 dev_err(ir->dev, "submit urb failed: %d", ret);130}131 132static void igorplugusb_timer(struct timer_list *t)133{134 struct igorplugusb *ir = from_timer(ir, t, timer);135 136 igorplugusb_cmd(ir, GET_INFRACODE);137}138 139static int igorplugusb_probe(struct usb_interface *intf,140 const struct usb_device_id *id)141{142 struct usb_device *udev;143 struct usb_host_interface *idesc;144 struct usb_endpoint_descriptor *ep;145 struct igorplugusb *ir;146 struct rc_dev *rc;147 int ret = -ENOMEM;148 149 udev = interface_to_usbdev(intf);150 idesc = intf->cur_altsetting;151 152 if (idesc->desc.bNumEndpoints != 1) {153 dev_err(&intf->dev, "incorrect number of endpoints");154 return -ENODEV;155 }156 157 ep = &idesc->endpoint[0].desc;158 if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) {159 dev_err(&intf->dev, "endpoint incorrect");160 return -ENODEV;161 }162 163 ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL);164 if (!ir)165 return -ENOMEM;166 167 ir->dev = &intf->dev;168 169 timer_setup(&ir->timer, igorplugusb_timer, 0);170 171 ir->request.bRequest = GET_INFRACODE;172 ir->request.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN;173 ir->request.wLength = cpu_to_le16(MAX_PACKET);174 175 ir->urb = usb_alloc_urb(0, GFP_KERNEL);176 if (!ir->urb)177 goto fail;178 179 ir->buf_in = kmalloc(MAX_PACKET, GFP_KERNEL);180 if (!ir->buf_in)181 goto fail;182 usb_fill_control_urb(ir->urb, udev,183 usb_rcvctrlpipe(udev, 0), (uint8_t *)&ir->request,184 ir->buf_in, MAX_PACKET, igorplugusb_callback, ir);185 186 usb_make_path(udev, ir->phys, sizeof(ir->phys));187 188 rc = rc_allocate_device(RC_DRIVER_IR_RAW);189 if (!rc)190 goto fail;191 192 rc->device_name = DRIVER_DESC;193 rc->input_phys = ir->phys;194 usb_to_input_id(udev, &rc->input_id);195 rc->dev.parent = &intf->dev;196 /*197 * This device can only store 36 pulses + spaces, which is not enough198 * for the NEC protocol and many others.199 */200 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER &201 ~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 |202 RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 |203 RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE |204 RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_SANYO);205 206 rc->priv = ir;207 rc->driver_name = DRIVER_NAME;208 rc->map_name = RC_MAP_HAUPPAUGE;209 rc->timeout = MS_TO_US(100);210 rc->rx_resolution = 85;211 212 ir->rc = rc;213 ret = rc_register_device(rc);214 if (ret) {215 dev_err(&intf->dev, "failed to register rc device: %d", ret);216 goto fail;217 }218 219 usb_set_intfdata(intf, ir);220 221 igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY);222 223 return 0;224fail:225 usb_poison_urb(ir->urb);226 del_timer(&ir->timer);227 usb_unpoison_urb(ir->urb);228 usb_free_urb(ir->urb);229 rc_free_device(ir->rc);230 kfree(ir->buf_in);231 232 return ret;233}234 235static void igorplugusb_disconnect(struct usb_interface *intf)236{237 struct igorplugusb *ir = usb_get_intfdata(intf);238 239 rc_unregister_device(ir->rc);240 usb_poison_urb(ir->urb);241 del_timer_sync(&ir->timer);242 usb_set_intfdata(intf, NULL);243 usb_unpoison_urb(ir->urb);244 usb_free_urb(ir->urb);245 kfree(ir->buf_in);246}247 248static const struct usb_device_id igorplugusb_table[] = {249 /* Igor Plug USB (Atmel's Manufact. ID) */250 { USB_DEVICE(0x03eb, 0x0002) },251 /* Fit PC2 Infrared Adapter */252 { USB_DEVICE(0x03eb, 0x21fe) },253 /* Terminating entry */254 { }255};256 257static struct usb_driver igorplugusb_driver = {258 .name = DRIVER_NAME,259 .probe = igorplugusb_probe,260 .disconnect = igorplugusb_disconnect,261 .id_table = igorplugusb_table262};263 264module_usb_driver(igorplugusb_driver);265 266MODULE_DESCRIPTION(DRIVER_DESC);267MODULE_AUTHOR("Sean Young <sean@mess.org>");268MODULE_LICENSE("GPL");269MODULE_DEVICE_TABLE(usb, igorplugusb_table);270