hid-logitech-dj.c 30.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
/*
 *  HID driver for Logitech Unifying receivers
 *
 *  Copyright (c) 2011 Logitech
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.

 *
 * 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/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
29
#include <asm/unaligned.h>
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
#include "hid-ids.h"
#include "hid-logitech-dj.h"

/* Keyboard descriptor (1) */
static const char kbd_descriptor[] = {
	0x05, 0x01,		/* USAGE_PAGE (generic Desktop)     */
	0x09, 0x06,		/* USAGE (Keyboard)         */
	0xA1, 0x01,		/* COLLECTION (Application)     */
	0x85, 0x01,		/* REPORT_ID (1)            */
	0x95, 0x08,		/*   REPORT_COUNT (8)           */
	0x75, 0x01,		/*   REPORT_SIZE (1)            */
	0x15, 0x00,		/*   LOGICAL_MINIMUM (0)        */
	0x25, 0x01,		/*   LOGICAL_MAXIMUM (1)        */
	0x05, 0x07,		/*   USAGE_PAGE (Keyboard)      */
	0x19, 0xE0,		/*   USAGE_MINIMUM (Left Control)   */
	0x29, 0xE7,		/*   USAGE_MAXIMUM (Right GUI)      */
	0x81, 0x02,		/*   INPUT (Data,Var,Abs)       */
	0x95, 0x05,		/*   REPORT COUNT (5)           */
	0x05, 0x08,		/*   USAGE PAGE (LED page)      */
	0x19, 0x01,		/*   USAGE MINIMUM (1)          */
	0x29, 0x05,		/*   USAGE MAXIMUM (5)          */
	0x91, 0x02,		/*   OUTPUT (Data, Variable, Absolute)  */
	0x95, 0x01,		/*   REPORT COUNT (1)           */
	0x75, 0x03,		/*   REPORT SIZE (3)            */
	0x91, 0x01,		/*   OUTPUT (Constant)          */
	0x95, 0x06,		/*   REPORT_COUNT (6)           */
	0x75, 0x08,		/*   REPORT_SIZE (8)            */
	0x15, 0x00,		/*   LOGICAL_MINIMUM (0)        */
	0x26, 0xFF, 0x00,	/*   LOGICAL_MAXIMUM (255)      */
	0x05, 0x07,		/*   USAGE_PAGE (Keyboard)      */
	0x19, 0x00,		/*   USAGE_MINIMUM (no event)       */
	0x2A, 0xFF, 0x00,	/*   USAGE_MAXIMUM (reserved)       */
	0x81, 0x00,		/*   INPUT (Data,Ary,Abs)       */
	0xC0
};

/* Mouse descriptor (2)     */
static const char mse_descriptor[] = {
	0x05, 0x01,		/*  USAGE_PAGE (Generic Desktop)        */
	0x09, 0x02,		/*  USAGE (Mouse)                       */
	0xA1, 0x01,		/*  COLLECTION (Application)            */
	0x85, 0x02,		/*    REPORT_ID = 2                     */
	0x09, 0x01,		/*    USAGE (pointer)                   */
	0xA1, 0x00,		/*    COLLECTION (physical)             */
	0x05, 0x09,		/*      USAGE_PAGE (buttons)            */
	0x19, 0x01,		/*      USAGE_MIN (1)                   */
	0x29, 0x10,		/*      USAGE_MAX (16)                  */
	0x15, 0x00,		/*      LOGICAL_MIN (0)                 */
	0x25, 0x01,		/*      LOGICAL_MAX (1)                 */
	0x95, 0x10,		/*      REPORT_COUNT (16)               */
	0x75, 0x01,		/*      REPORT_SIZE (1)                 */
	0x81, 0x02,		/*      INPUT (data var abs)            */
	0x05, 0x01,		/*      USAGE_PAGE (generic desktop)    */
	0x16, 0x01, 0xF8,	/*      LOGICAL_MIN (-2047)             */
	0x26, 0xFF, 0x07,	/*      LOGICAL_MAX (2047)              */
	0x75, 0x0C,		/*      REPORT_SIZE (12)                */
	0x95, 0x02,		/*      REPORT_COUNT (2)                */
	0x09, 0x30,		/*      USAGE (X)                       */
	0x09, 0x31,		/*      USAGE (Y)                       */
	0x81, 0x06,		/*      INPUT                           */
	0x15, 0x81,		/*      LOGICAL_MIN (-127)              */
	0x25, 0x7F,		/*      LOGICAL_MAX (127)               */
	0x75, 0x08,		/*      REPORT_SIZE (8)                 */
	0x95, 0x01,		/*      REPORT_COUNT (1)                */
	0x09, 0x38,		/*      USAGE (wheel)                   */
	0x81, 0x06,		/*      INPUT                           */
	0x05, 0x0C,		/*      USAGE_PAGE(consumer)            */
	0x0A, 0x38, 0x02,	/*      USAGE(AC Pan)                   */
	0x95, 0x01,		/*      REPORT_COUNT (1)                */
	0x81, 0x06,		/*      INPUT                           */
	0xC0,			/*    END_COLLECTION                    */
	0xC0,			/*  END_COLLECTION                      */
};

/* Consumer Control descriptor (3) */
static const char consumer_descriptor[] = {
	0x05, 0x0C,		/* USAGE_PAGE (Consumer Devices)       */
	0x09, 0x01,		/* USAGE (Consumer Control)            */
	0xA1, 0x01,		/* COLLECTION (Application)            */
	0x85, 0x03,		/* REPORT_ID = 3                       */
	0x75, 0x10,		/* REPORT_SIZE (16)                    */
	0x95, 0x02,		/* REPORT_COUNT (2)                    */
	0x15, 0x01,		/* LOGICAL_MIN (1)                     */
	0x26, 0x8C, 0x02,	/* LOGICAL_MAX (652)                   */
	0x19, 0x01,		/* USAGE_MIN (1)                       */
	0x2A, 0x8C, 0x02,	/* USAGE_MAX (652)                     */
	0x81, 0x00,		/* INPUT (Data Ary Abs)                */
	0xC0,			/* END_COLLECTION                      */
};				/*                                     */

/* System control descriptor (4) */
static const char syscontrol_descriptor[] = {
	0x05, 0x01,		/*   USAGE_PAGE (Generic Desktop)      */
	0x09, 0x80,		/*   USAGE (System Control)            */
	0xA1, 0x01,		/*   COLLECTION (Application)          */
	0x85, 0x04,		/*   REPORT_ID = 4                     */
	0x75, 0x02,		/*   REPORT_SIZE (2)                   */
	0x95, 0x01,		/*   REPORT_COUNT (1)                  */
	0x15, 0x01,		/*   LOGICAL_MIN (1)                   */
	0x25, 0x03,		/*   LOGICAL_MAX (3)                   */
	0x09, 0x82,		/*   USAGE (System Sleep)              */
	0x09, 0x81,		/*   USAGE (System Power Down)         */
	0x09, 0x83,		/*   USAGE (System Wake Up)            */
	0x81, 0x60,		/*   INPUT (Data Ary Abs NPrf Null)    */
	0x75, 0x06,		/*   REPORT_SIZE (6)                   */
	0x81, 0x03,		/*   INPUT (Cnst Var Abs)              */
	0xC0,			/*   END_COLLECTION                    */
};

/* Media descriptor (8) */
static const char media_descriptor[] = {
	0x06, 0xbc, 0xff,	/* Usage Page 0xffbc                   */
	0x09, 0x88,		/* Usage 0x0088                        */
	0xa1, 0x01,		/* BeginCollection                     */
	0x85, 0x08,		/*   Report ID 8                       */
	0x19, 0x01,		/*   Usage Min 0x0001                  */
	0x29, 0xff,		/*   Usage Max 0x00ff                  */
	0x15, 0x01,		/*   Logical Min 1                     */
	0x26, 0xff, 0x00,	/*   Logical Max 255                   */
	0x75, 0x08,		/*   Report Size 8                     */
	0x95, 0x01,		/*   Report Count 1                    */
	0x81, 0x00,		/*   Input                             */
	0xc0,			/* EndCollection                       */
};				/*                                     */

/* Maximum size of all defined hid reports in bytes (including report id) */
#define MAX_REPORT_SIZE 8

158 159 160 161 162 163 164 165
/* Make sure all descriptors are present here */
#define MAX_RDESC_SIZE				\
	(sizeof(kbd_descriptor) +		\
	 sizeof(mse_descriptor) +		\
	 sizeof(consumer_descriptor) +		\
	 sizeof(syscontrol_descriptor) +	\
	 sizeof(media_descriptor))

166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194
/* Number of possible hid report types that can be created by this driver.
 *
 * Right now, RF report types have the same report types (or report id's)
 * than the hid report created from those RF reports. In the future
 * this doesnt have to be true.
 *
 * For instance, RF report type 0x01 which has a size of 8 bytes, corresponds
 * to hid report id 0x01, this is standard keyboard. Same thing applies to mice
 * reports and consumer control, etc. If a new RF report is created, it doesn't
 * has to have the same report id as its corresponding hid report, so an
 * translation may have to take place for future report types.
 */
#define NUMBER_OF_HID_REPORTS 32
static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
	[1] = 8,		/* Standard keyboard */
	[2] = 8,		/* Standard mouse */
	[3] = 5,		/* Consumer control */
	[4] = 2,		/* System control */
	[8] = 2,		/* Media Center */
};


#define LOGITECH_DJ_INTERFACE_NUMBER 0x02

static struct hid_ll_driver logi_dj_ll_driver;

static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
					size_t count,
					unsigned char report_type);
195
static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev);
196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235

static void logi_dj_recv_destroy_djhid_device(struct dj_receiver_dev *djrcv_dev,
						struct dj_report *dj_report)
{
	/* Called in delayed work context */
	struct dj_device *dj_dev;
	unsigned long flags;

	spin_lock_irqsave(&djrcv_dev->lock, flags);
	dj_dev = djrcv_dev->paired_dj_devices[dj_report->device_index];
	djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
	spin_unlock_irqrestore(&djrcv_dev->lock, flags);

	if (dj_dev != NULL) {
		hid_destroy_device(dj_dev->hdev);
		kfree(dj_dev);
	} else {
		dev_err(&djrcv_dev->hdev->dev, "%s: can't destroy a NULL device\n",
			__func__);
	}
}

static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev,
					  struct dj_report *dj_report)
{
	/* Called in delayed work context */
	struct hid_device *djrcv_hdev = djrcv_dev->hdev;
	struct usb_interface *intf = to_usb_interface(djrcv_hdev->dev.parent);
	struct usb_device *usbdev = interface_to_usbdev(intf);
	struct hid_device *dj_hiddev;
	struct dj_device *dj_dev;

	/* Device index goes from 1 to 6, we need 3 bytes to store the
	 * semicolon, the index, and a null terminator
	 */
	unsigned char tmpstr[3];

	if (dj_report->report_params[DEVICE_PAIRED_PARAM_SPFUNCTION] &
	    SPFUNCTION_DEVICE_LIST_EMPTY) {
		dbg_hid("%s: device list is empty\n", __func__);
236
		djrcv_dev->querying_devices = false;
237 238 239 240 241 242 243 244 245 246
		return;
	}

	if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) ||
	    (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) {
		dev_err(&djrcv_hdev->dev, "%s: invalid device index:%d\n",
			__func__, dj_report->device_index);
		return;
	}

247 248 249 250 251 252
	if (djrcv_dev->paired_dj_devices[dj_report->device_index]) {
		/* The device is already known. No need to reallocate it. */
		dbg_hid("%s: device is already known\n", __func__);
		return;
	}

253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283
	dj_hiddev = hid_allocate_device();
	if (IS_ERR(dj_hiddev)) {
		dev_err(&djrcv_hdev->dev, "%s: hid_allocate_device failed\n",
			__func__);
		return;
	}

	dj_hiddev->ll_driver = &logi_dj_ll_driver;
	dj_hiddev->hid_output_raw_report = logi_dj_output_hidraw_report;

	dj_hiddev->dev.parent = &djrcv_hdev->dev;
	dj_hiddev->bus = BUS_USB;
	dj_hiddev->vendor = le16_to_cpu(usbdev->descriptor.idVendor);
	dj_hiddev->product = le16_to_cpu(usbdev->descriptor.idProduct);
	snprintf(dj_hiddev->name, sizeof(dj_hiddev->name),
		"Logitech Unifying Device. Wireless PID:%02x%02x",
		dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_MSB],
		dj_report->report_params[DEVICE_PAIRED_PARAM_EQUAD_ID_LSB]);

	usb_make_path(usbdev, dj_hiddev->phys, sizeof(dj_hiddev->phys));
	snprintf(tmpstr, sizeof(tmpstr), ":%d", dj_report->device_index);
	strlcat(dj_hiddev->phys, tmpstr, sizeof(dj_hiddev->phys));

	dj_dev = kzalloc(sizeof(struct dj_device), GFP_KERNEL);

	if (!dj_dev) {
		dev_err(&djrcv_hdev->dev, "%s: failed allocating dj_device\n",
			__func__);
		goto dj_device_allocate_fail;
	}

284 285
	dj_dev->reports_supported = get_unaligned_le32(
		dj_report->report_params + DEVICE_PAIRED_RF_REPORT_TYPE);
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
	dj_dev->hdev = dj_hiddev;
	dj_dev->dj_receiver_dev = djrcv_dev;
	dj_dev->device_index = dj_report->device_index;
	dj_hiddev->driver_data = dj_dev;

	djrcv_dev->paired_dj_devices[dj_report->device_index] = dj_dev;

	if (hid_add_device(dj_hiddev)) {
		dev_err(&djrcv_hdev->dev, "%s: failed adding dj_device\n",
			__func__);
		goto hid_add_device_fail;
	}

	return;

hid_add_device_fail:
	djrcv_dev->paired_dj_devices[dj_report->device_index] = NULL;
	kfree(dj_dev);
dj_device_allocate_fail:
	hid_destroy_device(dj_hiddev);
}

static void delayedwork_callback(struct work_struct *work)
{
	struct dj_receiver_dev *djrcv_dev =
		container_of(work, struct dj_receiver_dev, work);

	struct dj_report dj_report;
	unsigned long flags;
	int count;
316
	int retval;
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348

	dbg_hid("%s\n", __func__);

	spin_lock_irqsave(&djrcv_dev->lock, flags);

	count = kfifo_out(&djrcv_dev->notif_fifo, &dj_report,
				sizeof(struct dj_report));

	if (count != sizeof(struct dj_report)) {
		dev_err(&djrcv_dev->hdev->dev, "%s: workitem triggered without "
			"notifications available\n", __func__);
		spin_unlock_irqrestore(&djrcv_dev->lock, flags);
		return;
	}

	if (!kfifo_is_empty(&djrcv_dev->notif_fifo)) {
		if (schedule_work(&djrcv_dev->work) == 0) {
			dbg_hid("%s: did not schedule the work item, was "
				"already queued\n", __func__);
		}
	}

	spin_unlock_irqrestore(&djrcv_dev->lock, flags);

	switch (dj_report.report_type) {
	case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
		logi_dj_recv_add_djhid_device(djrcv_dev, &dj_report);
		break;
	case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
		logi_dj_recv_destroy_djhid_device(djrcv_dev, &dj_report);
		break;
	default:
349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367
	/* A normal report (i. e. not belonging to a pair/unpair notification)
	 * arriving here, means that the report arrived but we did not have a
	 * paired dj_device associated to the report's device_index, this
	 * means that the original "device paired" notification corresponding
	 * to this dj_device never arrived to this driver. The reason is that
	 * hid-core discards all packets coming from a device while probe() is
	 * executing. */
	if (!djrcv_dev->paired_dj_devices[dj_report.device_index]) {
		/* ok, we don't know the device, just re-ask the
		 * receiver for the list of connected devices. */
		retval = logi_dj_recv_query_paired_devices(djrcv_dev);
		if (!retval) {
			/* everything went fine, so just leave */
			break;
		}
		dev_err(&djrcv_dev->hdev->dev,
			"%s:logi_dj_recv_query_paired_devices "
			"error:%d\n", __func__, retval);
		}
368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397
		dbg_hid("%s: unexpected report type\n", __func__);
	}
}

static void logi_dj_recv_queue_notification(struct dj_receiver_dev *djrcv_dev,
					   struct dj_report *dj_report)
{
	/* We are called from atomic context (tasklet && djrcv->lock held) */

	kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));

	if (schedule_work(&djrcv_dev->work) == 0) {
		dbg_hid("%s: did not schedule the work item, was already "
			"queued\n", __func__);
	}
}

static void logi_dj_recv_forward_null_report(struct dj_receiver_dev *djrcv_dev,
					     struct dj_report *dj_report)
{
	/* We are called from atomic context (tasklet && djrcv->lock held) */
	unsigned int i;
	u8 reportbuffer[MAX_REPORT_SIZE];
	struct dj_device *djdev;

	djdev = djrcv_dev->paired_dj_devices[dj_report->device_index];

	if (!djdev) {
		dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
			" is NULL, index %d\n", dj_report->device_index);
398 399 400 401 402 403
		kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));

		if (schedule_work(&djrcv_dev->work) == 0) {
			dbg_hid("%s: did not schedule the work item, was already "
			"queued\n", __func__);
		}
404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433
		return;
	}

	memset(reportbuffer, 0, sizeof(reportbuffer));

	for (i = 0; i < NUMBER_OF_HID_REPORTS; i++) {
		if (djdev->reports_supported & (1 << i)) {
			reportbuffer[0] = i;
			if (hid_input_report(djdev->hdev,
					     HID_INPUT_REPORT,
					     reportbuffer,
					     hid_reportid_size_map[i], 1)) {
				dbg_hid("hid_input_report error sending null "
					"report\n");
			}
		}
	}
}

static void logi_dj_recv_forward_report(struct dj_receiver_dev *djrcv_dev,
					struct dj_report *dj_report)
{
	/* We are called from atomic context (tasklet && djrcv->lock held) */
	struct dj_device *dj_device;

	dj_device = djrcv_dev->paired_dj_devices[dj_report->device_index];

	if (dj_device == NULL) {
		dbg_hid("djrcv_dev->paired_dj_devices[dj_report->device_index]"
			" is NULL, index %d\n", dj_report->device_index);
434 435 436 437 438 439
		kfifo_in(&djrcv_dev->notif_fifo, dj_report, sizeof(struct dj_report));

		if (schedule_work(&djrcv_dev->work) == 0) {
			dbg_hid("%s: did not schedule the work item, was already "
			"queued\n", __func__);
		}
440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
		return;
	}

	if ((dj_report->report_type > ARRAY_SIZE(hid_reportid_size_map) - 1) ||
	    (hid_reportid_size_map[dj_report->report_type] == 0)) {
		dbg_hid("invalid report type:%x\n", dj_report->report_type);
		return;
	}

	if (hid_input_report(dj_device->hdev,
			HID_INPUT_REPORT, &dj_report->report_type,
			hid_reportid_size_map[dj_report->report_type], 1)) {
		dbg_hid("hid_input_report error\n");
	}
}


static int logi_dj_recv_send_report(struct dj_receiver_dev *djrcv_dev,
				    struct dj_report *dj_report)
{
	struct hid_device *hdev = djrcv_dev->hdev;
461 462 463
	struct hid_report *report;
	struct hid_report_enum *output_report_enum;
	u8 *data = (u8 *)(&dj_report->device_index);
464
	unsigned int i;
465

466 467 468 469 470
	output_report_enum = &hdev->report_enum[HID_OUTPUT_REPORT];
	report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];

	if (!report) {
		dev_err(&hdev->dev, "%s: unable to find dj report\n", __func__);
471 472 473
		return -ENODEV;
	}

474
	for (i = 0; i < DJREPORT_SHORT_LENGTH - 1; i++)
475 476
		report->field[0]->value[i] = data[i];

477
	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
478

479
	return 0;
480 481 482 483
}

static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev)
{
484 485
	struct dj_report *dj_report;
	int retval;
486

487 488 489 490
	/* no need to protect djrcv_dev->querying_devices */
	if (djrcv_dev->querying_devices)
		return 0;

A
Alan Cox 已提交
491
	dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
492 493 494 495 496 497 498 499
	if (!dj_report)
		return -ENOMEM;
	dj_report->report_id = REPORT_ID_DJ_SHORT;
	dj_report->device_index = 0xFF;
	dj_report->report_type = REPORT_TYPE_CMD_GET_PAIRED_DEVICES;
	retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
	kfree(dj_report);
	return retval;
500 501
}

502

503 504 505
static int logi_dj_recv_switch_to_dj_mode(struct dj_receiver_dev *djrcv_dev,
					  unsigned timeout)
{
506 507
	struct dj_report *dj_report;
	int retval;
508

A
Alan Cox 已提交
509
	dj_report = kzalloc(sizeof(struct dj_report), GFP_KERNEL);
510 511 512 513 514 515 516 517 518
	if (!dj_report)
		return -ENOMEM;
	dj_report->report_id = REPORT_ID_DJ_SHORT;
	dj_report->device_index = 0xFF;
	dj_report->report_type = REPORT_TYPE_CMD_SWITCH;
	dj_report->report_params[CMD_SWITCH_PARAM_DEVBITFIELD] = 0x3F;
	dj_report->report_params[CMD_SWITCH_PARAM_TIMEOUT_SECONDS] = (u8)timeout;
	retval = logi_dj_recv_send_report(djrcv_dev, dj_report);
	kfree(dj_report);
519 520 521 522 523 524 525 526

	/*
	 * Ugly sleep to work around a USB 3.0 bug when the receiver is still
	 * processing the "switch-to-dj" command while we send an other command.
	 * 50 msec should gives enough time to the receiver to be ready.
	 */
	msleep(50);

527
	return retval;
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
}


static int logi_dj_ll_open(struct hid_device *hid)
{
	dbg_hid("%s:%s\n", __func__, hid->phys);
	return 0;

}

static void logi_dj_ll_close(struct hid_device *hid)
{
	dbg_hid("%s:%s\n", __func__, hid->phys);
}

static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
					size_t count,
					unsigned char report_type)
{
	/* Called by hid raw to send data */
	dbg_hid("%s\n", __func__);

	return 0;
}

553
static void rdcat(char *rdesc, unsigned int *rsize, const char *data, unsigned int size)
554
{
555
	memcpy(rdesc + *rsize, data, size);
556 557 558
	*rsize += size;
}

559 560 561
static int logi_dj_ll_parse(struct hid_device *hid)
{
	struct dj_device *djdev = hid->driver_data;
562 563
	unsigned int rsize = 0;
	char *rdesc;
564 565 566 567 568 569 570
	int retval;

	dbg_hid("%s\n", __func__);

	djdev->hdev->version = 0x0111;
	djdev->hdev->country = 0x00;

571 572 573 574
	rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
	if (!rdesc)
		return -ENOMEM;

575 576 577
	if (djdev->reports_supported & STD_KEYBOARD) {
		dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
			__func__, djdev->reports_supported);
578
		rdcat(rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
579 580 581 582 583
	}

	if (djdev->reports_supported & STD_MOUSE) {
		dbg_hid("%s: sending a mouse descriptor, reports_supported: "
			"%x\n", __func__, djdev->reports_supported);
584
		rdcat(rdesc, &rsize, mse_descriptor, sizeof(mse_descriptor));
585 586 587 588 589
	}

	if (djdev->reports_supported & MULTIMEDIA) {
		dbg_hid("%s: sending a multimedia report descriptor: %x\n",
			__func__, djdev->reports_supported);
590
		rdcat(rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
591 592 593 594 595
	}

	if (djdev->reports_supported & POWER_KEYS) {
		dbg_hid("%s: sending a power keys report descriptor: %x\n",
			__func__, djdev->reports_supported);
596
		rdcat(rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
597 598 599 600 601
	}

	if (djdev->reports_supported & MEDIA_CENTER) {
		dbg_hid("%s: sending a media center report descriptor: %x\n",
			__func__, djdev->reports_supported);
602
		rdcat(rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
603 604 605 606 607 608 609
	}

	if (djdev->reports_supported & KBD_LEDS) {
		dbg_hid("%s: need to send kbd leds report descriptor: %x\n",
			__func__, djdev->reports_supported);
	}

610 611 612 613
	retval = hid_parse_report(hid, rdesc, rsize);
	kfree(rdesc);

	return retval;
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
}

static int logi_dj_ll_input_event(struct input_dev *dev, unsigned int type,
				  unsigned int code, int value)
{
	/* Sent by the input layer to handle leds and Force Feedback */
	struct hid_device *dj_hiddev = input_get_drvdata(dev);
	struct dj_device *dj_dev = dj_hiddev->driver_data;

	struct dj_receiver_dev *djrcv_dev =
	    dev_get_drvdata(dj_hiddev->dev.parent);
	struct hid_device *dj_rcv_hiddev = djrcv_dev->hdev;
	struct hid_report_enum *output_report_enum;

	struct hid_field *field;
	struct hid_report *report;
630
	unsigned char *data;
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
	int offset;

	dbg_hid("%s: %s, type:%d | code:%d | value:%d\n",
		__func__, dev->phys, type, code, value);

	if (type != EV_LED)
		return -1;

	offset = hidinput_find_field(dj_hiddev, type, code, &field);

	if (offset == -1) {
		dev_warn(&dev->dev, "event field not found\n");
		return -1;
	}
	hid_set_field(field, offset, value);
646

647
	data = hid_alloc_report_buf(field->report, GFP_ATOMIC);
648 649 650 651 652
	if (!data) {
		dev_warn(&dev->dev, "failed to allocate report buf memory\n");
		return -1;
	}

653 654 655 656 657 658 659 660
	hid_output_report(field->report, &data[0]);

	output_report_enum = &dj_rcv_hiddev->report_enum[HID_OUTPUT_REPORT];
	report = output_report_enum->report_id_hash[REPORT_ID_DJ_SHORT];
	hid_set_field(report->field[0], 0, dj_dev->device_index);
	hid_set_field(report->field[0], 1, REPORT_TYPE_LEDS);
	hid_set_field(report->field[0], 2, data[1]);

661
	hid_hw_request(dj_rcv_hiddev, report, HID_REQ_SET_REPORT);
662

663
	kfree(data);
664

665
	return 0;
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
}

static int logi_dj_ll_start(struct hid_device *hid)
{
	dbg_hid("%s\n", __func__);
	return 0;
}

static void logi_dj_ll_stop(struct hid_device *hid)
{
	dbg_hid("%s\n", __func__);
}


static struct hid_ll_driver logi_dj_ll_driver = {
	.parse = logi_dj_ll_parse,
	.start = logi_dj_ll_start,
	.stop = logi_dj_ll_stop,
	.open = logi_dj_ll_open,
	.close = logi_dj_ll_close,
	.hidinput_input_event = logi_dj_ll_input_event,
};


static int logi_dj_raw_event(struct hid_device *hdev,
			     struct hid_report *report, u8 *data,
			     int size)
{
	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
	struct dj_report *dj_report = (struct dj_report *) data;
	unsigned long flags;
	bool report_processed = false;

	dbg_hid("%s, size:%d\n", __func__, size);

	/* Here we receive all data coming from iface 2, there are 4 cases:
	 *
	 * 1) Data should continue its normal processing i.e. data does not
	 * come from the DJ collection, in which case we do nothing and
	 * return 0, so hid-core can continue normal processing (will forward
	 * to associated hidraw device)
	 *
	 * 2) Data is from DJ collection, and is intended for this driver i. e.
	 * data contains arrival, departure, etc notifications, in which case
	 * we queue them for delayed processing by the work queue. We return 1
	 * to hid-core as no further processing is required from it.
	 *
	 * 3) Data is from DJ collection, and informs a connection change,
	 * if the change means rf link loss, then we must send a null report
	 * to the upper layer to discard potentially pressed keys that may be
	 * repeated forever by the input layer. Return 1 to hid-core as no
	 * further processing is required.
	 *
	 * 4) Data is from DJ collection and is an actual input event from
	 * a paired DJ device in which case we forward it to the correct hid
	 * device (via hid_input_report() ) and return 1 so hid-core does not do
	 * anything else with it.
	 */

	spin_lock_irqsave(&djrcv_dev->lock, flags);
	if (dj_report->report_id == REPORT_ID_DJ_SHORT) {
		switch (dj_report->report_type) {
		case REPORT_TYPE_NOTIF_DEVICE_PAIRED:
		case REPORT_TYPE_NOTIF_DEVICE_UNPAIRED:
			logi_dj_recv_queue_notification(djrcv_dev, dj_report);
			break;
		case REPORT_TYPE_NOTIF_CONNECTION_STATUS:
			if (dj_report->report_params[CONNECTION_STATUS_PARAM_STATUS] ==
			    STATUS_LINKLOSS) {
				logi_dj_recv_forward_null_report(djrcv_dev, dj_report);
			}
			break;
		default:
			logi_dj_recv_forward_report(djrcv_dev, dj_report);
		}
		report_processed = true;
	}
	spin_unlock_irqrestore(&djrcv_dev->lock, flags);

	return report_processed;
}

static int logi_dj_probe(struct hid_device *hdev,
			 const struct hid_device_id *id)
{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	struct dj_receiver_dev *djrcv_dev;
	int retval;

	if (is_dj_device((struct dj_device *)hdev->driver_data))
		return -ENODEV;

	dbg_hid("%s called for ifnum %d\n", __func__,
		intf->cur_altsetting->desc.bInterfaceNumber);

	/* Ignore interfaces 0 and 1, they will not carry any data, dont create
	 * any hid_device for them */
	if (intf->cur_altsetting->desc.bInterfaceNumber !=
	    LOGITECH_DJ_INTERFACE_NUMBER) {
		dbg_hid("%s: ignoring ifnum %d\n", __func__,
			intf->cur_altsetting->desc.bInterfaceNumber);
		return -ENODEV;
	}

	/* Treat interface 2 */

	djrcv_dev = kzalloc(sizeof(struct dj_receiver_dev), GFP_KERNEL);
	if (!djrcv_dev) {
		dev_err(&hdev->dev,
			"%s:failed allocating dj_receiver_dev\n", __func__);
		return -ENOMEM;
	}
	djrcv_dev->hdev = hdev;
	INIT_WORK(&djrcv_dev->work, delayedwork_callback);
	spin_lock_init(&djrcv_dev->lock);
	if (kfifo_alloc(&djrcv_dev->notif_fifo,
			DJ_MAX_NUMBER_NOTIFICATIONS * sizeof(struct dj_report),
			GFP_KERNEL)) {
		dev_err(&hdev->dev,
			"%s:failed allocating notif_fifo\n", __func__);
		kfree(djrcv_dev);
		return -ENOMEM;
	}
	hid_set_drvdata(hdev, djrcv_dev);

	/* Call  to usbhid to fetch the HID descriptors of interface 2 and
	 * subsequently call to the hid/hid-core to parse the fetched
	 * descriptors, this will in turn create the hidraw and hiddev nodes
	 * for interface 2 of the receiver */
	retval = hid_parse(hdev);
	if (retval) {
		dev_err(&hdev->dev,
			"%s:parse of interface 2 failed\n", __func__);
		goto hid_parse_fail;
	}

802 803 804 805 806 807
	if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, REPORT_ID_DJ_SHORT,
				 0, DJREPORT_SHORT_LENGTH - 1)) {
		retval = -ENODEV;
		goto hid_parse_fail;
	}

808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
	/* Starts the usb device and connects to upper interfaces hiddev and
	 * hidraw */
	retval = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (retval) {
		dev_err(&hdev->dev,
			"%s:hid_hw_start returned error\n", __func__);
		goto hid_hw_start_fail;
	}

	retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
	if (retval < 0) {
		dev_err(&hdev->dev,
			"%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
			__func__, retval);
		goto switch_to_dj_mode_fail;
	}

	/* This is enabling the polling urb on the IN endpoint */
826
	retval = hid_hw_open(hdev);
827
	if (retval < 0) {
828 829
		dev_err(&hdev->dev, "%s:hid_hw_open returned error:%d\n",
			__func__, retval);
830 831 832
		goto llopen_failed;
	}

833 834 835
	/* Allow incoming packets to arrive: */
	hid_device_io_start(hdev);

836 837 838 839 840 841 842 843 844 845
	retval = logi_dj_recv_query_paired_devices(djrcv_dev);
	if (retval < 0) {
		dev_err(&hdev->dev, "%s:logi_dj_recv_query_paired_devices "
			"error:%d\n", __func__, retval);
		goto logi_dj_recv_query_paired_devices_failed;
	}

	return retval;

logi_dj_recv_query_paired_devices_failed:
846
	hid_hw_close(hdev);
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887

llopen_failed:
switch_to_dj_mode_fail:
	hid_hw_stop(hdev);

hid_hw_start_fail:
hid_parse_fail:
	kfifo_free(&djrcv_dev->notif_fifo);
	kfree(djrcv_dev);
	hid_set_drvdata(hdev, NULL);
	return retval;

}

#ifdef CONFIG_PM
static int logi_dj_reset_resume(struct hid_device *hdev)
{
	int retval;
	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);

	retval = logi_dj_recv_switch_to_dj_mode(djrcv_dev, 0);
	if (retval < 0) {
		dev_err(&hdev->dev,
			"%s:logi_dj_recv_switch_to_dj_mode returned error:%d\n",
			__func__, retval);
	}

	return 0;
}
#endif

static void logi_dj_remove(struct hid_device *hdev)
{
	struct dj_receiver_dev *djrcv_dev = hid_get_drvdata(hdev);
	struct dj_device *dj_dev;
	int i;

	dbg_hid("%s\n", __func__);

	cancel_work_sync(&djrcv_dev->work);

888
	hid_hw_close(hdev);
889 890 891 892 893 894 895
	hid_hw_stop(hdev);

	/* I suppose that at this point the only context that can access
	 * the djrecv_data is this thread as the work item is guaranteed to
	 * have finished and no more raw_event callbacks should arrive after
	 * the remove callback was triggered so no locks are put around the
	 * code below */
896
	for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995
		dj_dev = djrcv_dev->paired_dj_devices[i];
		if (dj_dev != NULL) {
			hid_destroy_device(dj_dev->hdev);
			kfree(dj_dev);
			djrcv_dev->paired_dj_devices[i] = NULL;
		}
	}

	kfifo_free(&djrcv_dev->notif_fifo);
	kfree(djrcv_dev);
	hid_set_drvdata(hdev, NULL);
}

static int logi_djdevice_probe(struct hid_device *hdev,
			 const struct hid_device_id *id)
{
	int ret;
	struct dj_device *dj_dev = hdev->driver_data;

	if (!is_dj_device(dj_dev))
		return -ENODEV;

	ret = hid_parse(hdev);
	if (!ret)
		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

	return ret;
}

static const struct hid_device_id logi_dj_receivers[] = {
	{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
		USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
	{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
		USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
	{}
};

MODULE_DEVICE_TABLE(hid, logi_dj_receivers);

static struct hid_driver logi_djreceiver_driver = {
	.name = "logitech-djreceiver",
	.id_table = logi_dj_receivers,
	.probe = logi_dj_probe,
	.remove = logi_dj_remove,
	.raw_event = logi_dj_raw_event,
#ifdef CONFIG_PM
	.reset_resume = logi_dj_reset_resume,
#endif
};


static const struct hid_device_id logi_dj_devices[] = {
	{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
		USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER)},
	{HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
		USB_DEVICE_ID_LOGITECH_UNIFYING_RECEIVER_2)},
	{}
};

static struct hid_driver logi_djdevice_driver = {
	.name = "logitech-djdevice",
	.id_table = logi_dj_devices,
	.probe = logi_djdevice_probe,
};


static int __init logi_dj_init(void)
{
	int retval;

	dbg_hid("Logitech-DJ:%s\n", __func__);

	retval = hid_register_driver(&logi_djreceiver_driver);
	if (retval)
		return retval;

	retval = hid_register_driver(&logi_djdevice_driver);
	if (retval)
		hid_unregister_driver(&logi_djreceiver_driver);

	return retval;

}

static void __exit logi_dj_exit(void)
{
	dbg_hid("Logitech-DJ:%s\n", __func__);

	hid_unregister_driver(&logi_djdevice_driver);
	hid_unregister_driver(&logi_djreceiver_driver);

}

module_init(logi_dj_init);
module_exit(logi_dj_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Logitech");
MODULE_AUTHOR("Nestor Lopez Casado");
MODULE_AUTHOR("nlopezcasad@logitech.com");