// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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@md.metrocast.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@kernel.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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#include "cx23885.h"
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#include "cx23885-input.h"
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#include <linux/slab.h>
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#include <media/rc-core.h>
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#include <media/v4l2-subdev.h>
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#define MODULE_NAME "cx23885"
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static void cx23885_input_process_measurements(struct cx23885_dev *dev,
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bool overrun)
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{
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struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;
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ssize_t num;
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int count, i;
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bool handle = false;
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struct ir_raw_event ir_core_event[64];
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do {
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num = 0;
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v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
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sizeof(ir_core_event), &num);
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count = num / sizeof(struct ir_raw_event);
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for (i = 0; i < count; i++) {
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ir_raw_event_store(kernel_ir->rc,
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&ir_core_event[i]);
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handle = true;
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}
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} while (num != 0);
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if (overrun)
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ir_raw_event_reset(kernel_ir->rc);
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else if (handle)
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ir_raw_event_handle(kernel_ir->rc);
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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_HVR1270:
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
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case CX23885_BOARD_TEVII_S470:
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case CX23885_BOARD_HAUPPAUGE_HVR1250:
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case CX23885_BOARD_MYGICA_X8507:
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case CX23885_BOARD_TBS_6980:
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case CX23885_BOARD_TBS_6981:
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case CX23885_BOARD_DVBSKY_T9580:
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case CX23885_BOARD_DVBSKY_T980C:
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case CX23885_BOARD_DVBSKY_S950C:
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case CX23885_BOARD_TT_CT2_4500_CI:
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case CX23885_BOARD_DVBSKY_S950:
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case CX23885_BOARD_DVBSKY_S952:
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case CX23885_BOARD_DVBSKY_T982:
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case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
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/*
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* The only boards 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_measurements(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 int cx23885_input_ir_start(struct cx23885_dev *dev)
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{
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struct v4l2_subdev_ir_parameters params;
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if (dev->sd_ir == NULL)
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return -ENODEV;
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atomic_set(&dev->ir_input_stopping, 0);
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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_HVR1270:
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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case CX23885_BOARD_HAUPPAUGE_HVR1250:
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case CX23885_BOARD_MYGICA_X8507:
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case CX23885_BOARD_DVBSKY_T9580:
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case CX23885_BOARD_DVBSKY_T980C:
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case CX23885_BOARD_DVBSKY_S950C:
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case CX23885_BOARD_TT_CT2_4500_CI:
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case CX23885_BOARD_DVBSKY_S950:
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case CX23885_BOARD_DVBSKY_S952:
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case CX23885_BOARD_DVBSKY_T982:
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case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
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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_level = true;
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break;
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case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
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case CX23885_BOARD_TEVII_S470:
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case CX23885_BOARD_TBS_6980:
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case CX23885_BOARD_TBS_6981:
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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 a standard NEC protocol */
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params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
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params.carrier_range_lower = 33000; /* Hz */
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params.carrier_range_upper = 43000; /* Hz */
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params.duty_cycle = 33; /* percent, 33 percent for NEC */
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/*
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* NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
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* (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
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*/
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params.max_pulse_width = 12378022; /* ns */
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/*
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* NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
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* (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
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*/
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params.noise_filter_min_width = 351648; /* ns */
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params.modulation = false;
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params.invert_level = 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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return 0;
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}
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static int cx23885_input_ir_open(struct rc_dev *rc)
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{
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struct cx23885_kernel_ir *kernel_ir = rc->priv;
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if (kernel_ir->cx == NULL)
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return -ENODEV;
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return cx23885_input_ir_start(kernel_ir->cx);
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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 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_work(&dev->cx25840_work);
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flush_work(&dev->ir_rx_work);
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flush_work(&dev->ir_tx_work);
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}
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static void cx23885_input_ir_close(struct rc_dev *rc)
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{
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struct cx23885_kernel_ir *kernel_ir = rc->priv;
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if (kernel_ir->cx != NULL)
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cx23885_input_ir_stop(kernel_ir->cx);
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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 cx23885_kernel_ir *kernel_ir;
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struct rc_dev *rc;
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char *rc_map;
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u64 allowed_protos;
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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_HVR1270:
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case CX23885_BOARD_HAUPPAUGE_HVR1850:
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case CX23885_BOARD_HAUPPAUGE_HVR1290:
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case CX23885_BOARD_HAUPPAUGE_HVR1250:
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case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
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/* Integrated CX2388[58] IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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/* The grey Hauppauge RC-5 remote */
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rc_map = RC_MAP_HAUPPAUGE;
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break;
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case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
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/* Integrated CX23885 IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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/* The grey Terratec remote with orange buttons */
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rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;
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break;
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case CX23885_BOARD_TEVII_S470:
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/* Integrated CX23885 IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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/* A guess at the remote */
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rc_map = RC_MAP_TEVII_NEC;
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break;
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case CX23885_BOARD_MYGICA_X8507:
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/* Integrated CX23885 IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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/* A guess at the remote */
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rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02;
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break;
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case CX23885_BOARD_TBS_6980:
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case CX23885_BOARD_TBS_6981:
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/* Integrated CX23885 IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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/* A guess at the remote */
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rc_map = RC_MAP_TBS_NEC;
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break;
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case CX23885_BOARD_DVBSKY_T9580:
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case CX23885_BOARD_DVBSKY_T980C:
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case CX23885_BOARD_DVBSKY_S950C:
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case CX23885_BOARD_DVBSKY_S950:
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case CX23885_BOARD_DVBSKY_S952:
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case CX23885_BOARD_DVBSKY_T982:
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/* Integrated CX23885 IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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rc_map = RC_MAP_DVBSKY;
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break;
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case CX23885_BOARD_TT_CT2_4500_CI:
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/* Integrated CX23885 IR controller */
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allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;
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rc_map = RC_MAP_TT_1500;
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break;
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default:
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return -ENODEV;
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}
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/* cx23885 board instance kernel IR state */
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kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
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if (kernel_ir == NULL)
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return -ENOMEM;
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kernel_ir->cx = dev;
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kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
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cx23885_boards[dev->board].name);
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if (!kernel_ir->name) {
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ret = -ENOMEM;
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goto err_out_free;
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}
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kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
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pci_name(dev->pci));
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if (!kernel_ir->phys) {
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ret = -ENOMEM;
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goto err_out_free_name;
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}
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/* input device */
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rc = rc_allocate_device(RC_DRIVER_IR_RAW);
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if (!rc) {
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ret = -ENOMEM;
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goto err_out_free_phys;
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}
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kernel_ir->rc = rc;
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rc->device_name = kernel_ir->name;
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rc->input_phys = kernel_ir->phys;
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rc->input_id.bustype = BUS_PCI;
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rc->input_id.version = 1;
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if (dev->pci->subsystem_vendor) {
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rc->input_id.vendor = dev->pci->subsystem_vendor;
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rc->input_id.product = dev->pci->subsystem_device;
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} else {
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rc->input_id.vendor = dev->pci->vendor;
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rc->input_id.product = dev->pci->device;
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}
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rc->dev.parent = &dev->pci->dev;
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rc->allowed_protocols = allowed_protos;
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rc->priv = kernel_ir;
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rc->open = cx23885_input_ir_open;
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rc->close = cx23885_input_ir_close;
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rc->map_name = rc_map;
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rc->driver_name = MODULE_NAME;
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/* Go */
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dev->kernel_ir = kernel_ir;
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ret = rc_register_device(rc);
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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->kernel_ir = NULL;
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rc_free_device(rc);
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err_out_free_phys:
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kfree(kernel_ir->phys);
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err_out_free_name:
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kfree(kernel_ir->name);
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err_out_free:
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kfree(kernel_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->kernel_ir == NULL)
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return;
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rc_unregister_device(dev->kernel_ir->rc);
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kfree(dev->kernel_ir->phys);
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kfree(dev->kernel_ir->name);
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kfree(dev->kernel_ir);
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dev->kernel_ir = NULL;
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}
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