424 lines
12 KiB
C
424 lines
12 KiB
C
/*
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* Driver for the Conexant CX23885/7/8 PCIe bridge
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*
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* Infrared remote control input device
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*
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* Most of this file is
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*
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* Copyright (C) 2009 Andy Walls <awalls@radix.net>
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*
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* However, the cx23885_input_{init,fini} functions contained herein are
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* derived from Linux kernel files linux/media/video/.../...-input.c marked as:
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*
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* Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
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* Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
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* Markus Rechberger <mrechberger@gmail.com>
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* Mauro Carvalho Chehab <mchehab@infradead.org>
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* Sascha Sommer <saschasommer@freenet.de>
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* Copyright (C) 2004, 2005 Chris Pascoe
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* Copyright (C) 2003, 2004 Gerd Knorr
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* Copyright (C) 2003 Pavel Machek
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/input.h>
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#include <media/ir-common.h>
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#include <media/v4l2-subdev.h>
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#include "cx23885.h"
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#define RC5_BITS 14
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#define RC5_HALF_BITS (2*RC5_BITS)
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#define RC5_HALF_BITS_MASK ((1 << RC5_HALF_BITS) - 1)
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#define RC5_START_BITS_NORMAL 0x3 /* Command range 0 - 63 */
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#define RC5_START_BITS_EXTENDED 0x2 /* Command range 64 - 127 */
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#define RC5_EXTENDED_COMMAND_OFFSET 64
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static inline unsigned int rc5_command(u32 rc5_baseband)
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{
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return RC5_INSTR(rc5_baseband) +
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((RC5_START(rc5_baseband) == RC5_START_BITS_EXTENDED)
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? RC5_EXTENDED_COMMAND_OFFSET : 0);
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}
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static void cx23885_input_process_raw_rc5(struct cx23885_dev *dev)
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{
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struct card_ir *ir_input = dev->ir_input;
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unsigned int code, command;
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u32 rc5;
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/* Ignore codes that are too short to be valid RC-5 */
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if (ir_input->last_bit < (RC5_HALF_BITS - 1))
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return;
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/* The library has the manchester coding backwards; XOR to adapt. */
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code = (ir_input->code & RC5_HALF_BITS_MASK) ^ RC5_HALF_BITS_MASK;
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rc5 = ir_rc5_decode(code);
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switch (RC5_START(rc5)) {
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case RC5_START_BITS_NORMAL:
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break;
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case RC5_START_BITS_EXTENDED:
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/* Don't allow if the remote only emits standard commands */
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if (ir_input->start == RC5_START_BITS_NORMAL)
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return;
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break;
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default:
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return;
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}
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if (ir_input->addr != RC5_ADDR(rc5))
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return;
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/* Don't generate a keypress for RC-5 auto-repeated keypresses */
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command = rc5_command(rc5);
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if (RC5_TOGGLE(rc5) != RC5_TOGGLE(ir_input->last_rc5) ||
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command != rc5_command(ir_input->last_rc5) ||
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/* Catch T == 0, CMD == 0 (e.g. '0') as first keypress after init */
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RC5_START(ir_input->last_rc5) == 0) {
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/* This keypress is differnet: not an auto repeat */
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ir_input_nokey(ir_input->dev, &ir_input->ir);
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ir_input_keydown(ir_input->dev, &ir_input->ir,
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command, ir_input->code);
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}
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ir_input->last_rc5 = rc5;
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/* Schedule when we should do the key up event: ir_input_nokey() */
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mod_timer(&ir_input->timer_keyup,
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jiffies + msecs_to_jiffies(ir_input->rc5_key_timeout));
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}
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static void cx23885_input_next_pulse_width_rc5(struct cx23885_dev *dev,
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u32 ns_pulse)
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{
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const int rc5_quarterbit_ns = 444444; /* 32 cycles/36 kHz/2 = 444 us */
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struct card_ir *ir_input = dev->ir_input;
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int i, level, quarterbits, halfbits;
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if (!ir_input->active) {
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ir_input->active = 1;
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/* assume an initial space that we may not detect or measure */
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ir_input->code = 0;
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ir_input->last_bit = 0;
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}
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if (ns_pulse == V4L2_SUBDEV_IR_PULSE_RX_SEQ_END) {
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ir_input->last_bit++; /* Account for the final space */
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ir_input->active = 0;
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cx23885_input_process_raw_rc5(dev);
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return;
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}
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level = (ns_pulse & V4L2_SUBDEV_IR_PULSE_LEVEL_MASK) ? 1 : 0;
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/* Skip any leading space to sync to the start bit */
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if (ir_input->last_bit == 0 && level == 0)
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return;
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/*
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* With valid RC-5 we can get up to two consecutive half-bits in a
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* single pulse measurment. Experiments have shown that the duration
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* of a half-bit can vary. Make sure we always end up with an even
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* number of quarter bits at the same level (mark or space).
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*/
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ns_pulse &= V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS;
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quarterbits = ns_pulse / rc5_quarterbit_ns;
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if (quarterbits & 1)
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quarterbits++;
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halfbits = quarterbits / 2;
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for (i = 0; i < halfbits; i++) {
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ir_input->last_bit++;
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ir_input->code |= (level << ir_input->last_bit);
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if (ir_input->last_bit >= RC5_HALF_BITS-1) {
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ir_input->active = 0;
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cx23885_input_process_raw_rc5(dev);
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/*
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* If level is 1, a leading mark is invalid for RC5.
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* If level is 0, we scan past extra intial space.
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* Either way we don't want to reactivate collecting
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* marks or spaces here with any left over half-bits.
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*/
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break;
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}
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}
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}
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static void cx23885_input_process_pulse_widths_rc5(struct cx23885_dev *dev,
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bool add_eom)
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{
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struct card_ir *ir_input = dev->ir_input;
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struct ir_input_state *ir_input_state = &ir_input->ir;
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u32 ns_pulse[RC5_HALF_BITS+1];
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ssize_t num = 0;
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int count, i;
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do {
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v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ns_pulse,
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sizeof(ns_pulse), &num);
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count = num / sizeof(u32);
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/* Append an end of Rx seq, if the caller requested */
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if (add_eom && count < ARRAY_SIZE(ns_pulse)) {
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ns_pulse[count] = V4L2_SUBDEV_IR_PULSE_RX_SEQ_END;
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count++;
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}
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/* Just drain the Rx FIFO, if we're called, but not RC-5 */
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if (ir_input_state->ir_type != IR_TYPE_RC5)
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continue;
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for (i = 0; i < count; i++)
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cx23885_input_next_pulse_width_rc5(dev, ns_pulse[i]);
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} while (num != 0);
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}
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void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
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{
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struct v4l2_subdev_ir_parameters params;
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int overrun, data_available;
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if (dev->sd_ir == NULL || events == 0)
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return;
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switch (dev->board) {
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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/*
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* The only board we handle right now. However other boards
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* using the CX2388x integrated IR controller should be similar
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*/
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break;
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default:
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return;
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}
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overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
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V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);
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data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
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V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);
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if (overrun) {
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/* If there was a FIFO overrun, stop the device */
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v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
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params.enable = false;
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/* Mitigate race with cx23885_input_ir_stop() */
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params.shutdown = atomic_read(&dev->ir_input_stopping);
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v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
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}
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if (data_available)
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cx23885_input_process_pulse_widths_rc5(dev, overrun);
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if (overrun) {
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/* If there was a FIFO overrun, clear & restart the device */
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params.enable = true;
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/* Mitigate race with cx23885_input_ir_stop() */
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params.shutdown = atomic_read(&dev->ir_input_stopping);
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v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
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}
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}
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static void cx23885_input_ir_start(struct cx23885_dev *dev)
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{
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struct card_ir *ir_input = dev->ir_input;
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struct ir_input_state *ir_input_state = &ir_input->ir;
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struct v4l2_subdev_ir_parameters params;
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if (dev->sd_ir == NULL)
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return;
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atomic_set(&dev->ir_input_stopping, 0);
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/* keyup timer set up, if needed */
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switch (dev->board) {
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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setup_timer(&ir_input->timer_keyup,
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ir_rc5_timer_keyup, /* Not actually RC-5 specific */
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(unsigned long) ir_input);
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if (ir_input_state->ir_type == IR_TYPE_RC5) {
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/*
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* RC-5 repeats a held key every
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* 64 bits * (2 * 32/36000) sec/bit = 113.778 ms
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*/
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ir_input->rc5_key_timeout = 115;
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}
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break;
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}
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v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
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switch (dev->board) {
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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/*
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* The IR controller on this board only returns pulse widths.
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* Any other mode setting will fail to set up the device.
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*/
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params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
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params.enable = true;
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params.interrupt_enable = true;
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params.shutdown = false;
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/* Setup for baseband compatible with both RC-5 and RC-6A */
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params.modulation = false;
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/* RC-5: 2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
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/* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
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params.max_pulse_width = 3333333; /* ns */
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/* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
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/* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
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params.noise_filter_min_width = 333333; /* ns */
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/*
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* This board has inverted receive sense:
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* mark is received as low logic level;
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* falling edges are detected as rising edges; etc.
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*/
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params.invert = true;
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break;
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}
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v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
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}
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static void cx23885_input_ir_stop(struct cx23885_dev *dev)
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{
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struct card_ir *ir_input = dev->ir_input;
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struct v4l2_subdev_ir_parameters params;
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if (dev->sd_ir == NULL)
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return;
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/*
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* Stop the sd_ir subdevice from generating notifications and
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* scheduling work.
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* It is shutdown this way in order to mitigate a race with
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* cx23885_input_rx_work_handler() in the overrun case, which could
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* re-enable the subdevice.
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*/
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atomic_set(&dev->ir_input_stopping, 1);
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v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
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while (params.shutdown == false) {
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params.enable = false;
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params.interrupt_enable = false;
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params.shutdown = true;
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v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
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v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
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}
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flush_scheduled_work();
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switch (dev->board) {
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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del_timer_sync(&ir_input->timer_keyup);
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break;
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}
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}
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int cx23885_input_init(struct cx23885_dev *dev)
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{
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struct card_ir *ir;
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struct input_dev *input_dev;
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struct ir_scancode_table *ir_codes = NULL;
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int ir_type, ir_addr, ir_start;
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int ret;
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/*
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* If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
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* encapsulated in a v4l2_subdev, then I'm not going to deal with it.
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*/
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if (dev->sd_ir == NULL)
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return -ENODEV;
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switch (dev->board) {
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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/* Parameters for the grey Hauppauge remote for the HVR-1850 */
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ir_codes = &ir_codes_hauppauge_new_table;
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ir_type = IR_TYPE_RC5;
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ir_addr = 0x1e; /* RC-5 system bits emitted by the remote */
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ir_start = RC5_START_BITS_NORMAL; /* A basic RC-5 remote */
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break;
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}
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if (ir_codes == NULL)
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return -ENODEV;
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ir = kzalloc(sizeof(*ir), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!ir || !input_dev) {
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ret = -ENOMEM;
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goto err_out_free;
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}
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ir->dev = input_dev;
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ir->addr = ir_addr;
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ir->start = ir_start;
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/* init input device */
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snprintf(ir->name, sizeof(ir->name), "cx23885 IR (%s)",
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cx23885_boards[dev->board].name);
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snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0", pci_name(dev->pci));
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ir_input_init(input_dev, &ir->ir, ir_type, ir_codes);
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input_dev->name = ir->name;
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input_dev->phys = ir->phys;
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input_dev->id.bustype = BUS_PCI;
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input_dev->id.version = 1;
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if (dev->pci->subsystem_vendor) {
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input_dev->id.vendor = dev->pci->subsystem_vendor;
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input_dev->id.product = dev->pci->subsystem_device;
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} else {
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input_dev->id.vendor = dev->pci->vendor;
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input_dev->id.product = dev->pci->device;
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}
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input_dev->dev.parent = &dev->pci->dev;
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dev->ir_input = ir;
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cx23885_input_ir_start(dev);
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ret = input_register_device(ir->dev);
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if (ret)
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goto err_out_stop;
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return 0;
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err_out_stop:
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cx23885_input_ir_stop(dev);
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dev->ir_input = NULL;
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err_out_free:
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input_free_device(input_dev);
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kfree(ir);
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return ret;
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}
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void cx23885_input_fini(struct cx23885_dev *dev)
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{
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/* Always stop the IR hardware from generating interrupts */
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cx23885_input_ir_stop(dev);
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if (dev->ir_input == NULL)
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return;
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input_unregister_device(dev->ir_input->dev);
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kfree(dev->ir_input);
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dev->ir_input = NULL;
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}
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