1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IgorPlug-USB IR Receiver 4 * 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.htm 9 * 10 * Based on the lirc_igorplugusb.c driver: 11 * Copyright (C) 2004 Jan M. Hochstein 12 * <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 3 25 #define BUFLEN 36 26 #define MAX_PACKET (HEADERLEN + BUFLEN) 27 28 #define SET_INFRABUFFER_EMPTY 1 29 #define GET_INFRACODE 2 30 31 32 struct 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 uint8_t buf_in[MAX_PACKET]; 42 43 char phys[64]; 44 }; 45 46 static void igorplugusb_cmd(struct igorplugusb *ir, int cmd); 47 48 static 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 igorplugusb 57 * overwrites its buffer from the beginning. The overflow value is the 58 * last offset which was not overwritten. Everything from this offset 59 * 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_reset(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 94 static 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 usb_unlink_urb(urb); 114 return; 115 default: 116 dev_warn(ir->dev, "Error: urb status = %d\n", urb->status); 117 igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY); 118 break; 119 } 120 } 121 122 static void igorplugusb_cmd(struct igorplugusb *ir, int cmd) 123 { 124 int ret; 125 126 ir->request.bRequest = cmd; 127 ir->urb->transfer_flags = 0; 128 ret = usb_submit_urb(ir->urb, GFP_ATOMIC); 129 if (ret) 130 dev_err(ir->dev, "submit urb failed: %d", ret); 131 } 132 133 static void igorplugusb_timer(struct timer_list *t) 134 { 135 struct igorplugusb *ir = from_timer(ir, t, timer); 136 137 igorplugusb_cmd(ir, GET_INFRACODE); 138 } 139 140 static int igorplugusb_probe(struct usb_interface *intf, 141 const struct usb_device_id *id) 142 { 143 struct usb_device *udev; 144 struct usb_host_interface *idesc; 145 struct usb_endpoint_descriptor *ep; 146 struct igorplugusb *ir; 147 struct rc_dev *rc; 148 int ret = -ENOMEM; 149 150 udev = interface_to_usbdev(intf); 151 idesc = intf->cur_altsetting; 152 153 if (idesc->desc.bNumEndpoints != 1) { 154 dev_err(&intf->dev, "incorrect number of endpoints"); 155 return -ENODEV; 156 } 157 158 ep = &idesc->endpoint[0].desc; 159 if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_control(ep)) { 160 dev_err(&intf->dev, "endpoint incorrect"); 161 return -ENODEV; 162 } 163 164 ir = devm_kzalloc(&intf->dev, sizeof(*ir), GFP_KERNEL); 165 if (!ir) 166 return -ENOMEM; 167 168 ir->dev = &intf->dev; 169 170 timer_setup(&ir->timer, igorplugusb_timer, 0); 171 172 ir->request.bRequest = GET_INFRACODE; 173 ir->request.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN; 174 ir->request.wLength = cpu_to_le16(sizeof(ir->buf_in)); 175 176 ir->urb = usb_alloc_urb(0, GFP_KERNEL); 177 if (!ir->urb) 178 goto fail; 179 180 usb_fill_control_urb(ir->urb, udev, 181 usb_rcvctrlpipe(udev, 0), (uint8_t *)&ir->request, 182 ir->buf_in, sizeof(ir->buf_in), igorplugusb_callback, ir); 183 184 usb_make_path(udev, ir->phys, sizeof(ir->phys)); 185 186 rc = rc_allocate_device(RC_DRIVER_IR_RAW); 187 if (!rc) 188 goto fail; 189 190 rc->device_name = DRIVER_DESC; 191 rc->input_phys = ir->phys; 192 usb_to_input_id(udev, &rc->input_id); 193 rc->dev.parent = &intf->dev; 194 /* 195 * This device can only store 36 pulses + spaces, which is not enough 196 * for the NEC protocol and many others. 197 */ 198 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER & 199 ~(RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 | 200 RC_PROTO_BIT_RC6_6A_20 | RC_PROTO_BIT_RC6_6A_24 | 201 RC_PROTO_BIT_RC6_6A_32 | RC_PROTO_BIT_RC6_MCE | 202 RC_PROTO_BIT_SONY20 | RC_PROTO_BIT_SANYO); 203 204 rc->priv = ir; 205 rc->driver_name = DRIVER_NAME; 206 rc->map_name = RC_MAP_HAUPPAUGE; 207 rc->timeout = MS_TO_US(100); 208 rc->rx_resolution = 85; 209 210 ir->rc = rc; 211 ret = rc_register_device(rc); 212 if (ret) { 213 dev_err(&intf->dev, "failed to register rc device: %d", ret); 214 goto fail; 215 } 216 217 usb_set_intfdata(intf, ir); 218 219 igorplugusb_cmd(ir, SET_INFRABUFFER_EMPTY); 220 221 return 0; 222 fail: 223 rc_free_device(ir->rc); 224 usb_free_urb(ir->urb); 225 del_timer(&ir->timer); 226 227 return ret; 228 } 229 230 static void igorplugusb_disconnect(struct usb_interface *intf) 231 { 232 struct igorplugusb *ir = usb_get_intfdata(intf); 233 234 rc_unregister_device(ir->rc); 235 del_timer_sync(&ir->timer); 236 usb_set_intfdata(intf, NULL); 237 usb_kill_urb(ir->urb); 238 usb_free_urb(ir->urb); 239 } 240 241 static const struct usb_device_id igorplugusb_table[] = { 242 /* Igor Plug USB (Atmel's Manufact. ID) */ 243 { USB_DEVICE(0x03eb, 0x0002) }, 244 /* Fit PC2 Infrared Adapter */ 245 { USB_DEVICE(0x03eb, 0x21fe) }, 246 /* Terminating entry */ 247 { } 248 }; 249 250 static struct usb_driver igorplugusb_driver = { 251 .name = DRIVER_NAME, 252 .probe = igorplugusb_probe, 253 .disconnect = igorplugusb_disconnect, 254 .id_table = igorplugusb_table 255 }; 256 257 module_usb_driver(igorplugusb_driver); 258 259 MODULE_DESCRIPTION(DRIVER_DESC); 260 MODULE_AUTHOR("Sean Young <sean@mess.org>"); 261 MODULE_LICENSE("GPL"); 262 MODULE_DEVICE_TABLE(usb, igorplugusb_table); 263