/*
* Driver for the Conexant CX23885/7/8 PCIe bridge
*
* Infrared remote control input device
*
* Most of this file is
*
* Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>
*
* However, the cx23885_input_{init,fini} functions contained herein are
* derived from Linux kernel files linux/media/video/.../...-input.c marked as:
*
* Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
* Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
* Markus Rechberger <mrechberger@gmail.com>
* Mauro Carvalho Chehab <mchehab@infradead.org>
* Sascha Sommer <saschasommer@freenet.de>
* Copyright (C) 2004, 2005 Chris Pascoe
* Copyright (C) 2003, 2004 Gerd Knorr
* Copyright (C) 2003 Pavel Machek
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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.
*/
#include <linux/slab.h>
#include <media/rc-core.h>
#include <media/v4l2-subdev.h>
#include "cx23885.h"
#include "cx23885-input.h"
#define MODULE_NAME "cx23885"
static void cx23885_input_process_measurements(struct cx23885_dev *dev,
bool overrun)
{
struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;
ssize_t num;
int count, i;
bool handle = false;
struct ir_raw_event ir_core_event[64];
do {
num = 0;
v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
sizeof(ir_core_event), &num);
count = num / sizeof(struct ir_raw_event);
for (i = 0; i < count; i++) {
ir_raw_event_store(kernel_ir->rc,
&ir_core_event[i]);
handle = true;
}
} while (num != 0);
if (overrun)
ir_raw_event_reset(kernel_ir->rc);
else if (handle)
ir_raw_event_handle(kernel_ir->rc);
}
void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
{
struct v4l2_subdev_ir_parameters params;
int overrun, data_available;
if (dev->sd_ir == NULL || events == 0)
return;
switch (dev->board) {
case CX23885_BOARD_HAUPPAUGE_HVR1270:
case CX23885_BOARD_HAUPPAUGE_HVR1850:
case CX23885_BOARD_HAUPPAUGE_HVR1290:
case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
case CX23885_BOARD_TEVII_S470:
case CX23885_BOARD_HAUPPAUGE_HVR1250:
case CX23885_BOARD_MYGICA_X8507:
case CX23885_BOARD_TBS_6980:
case CX23885_BOARD_TBS_6981:
case CX23885_BOARD_DVBSKY_T9580:
case CX23885_BOARD_DVBSKY_T980C:
case CX23885_BOARD_DVBSKY_S950C:
case CX23885_BOARD_TT_CT2_4500_CI:
case CX23885_BOARD_DVBSKY_S950:
case CX23885_BOARD_DVBSKY_S952:
case CX23885_BOARD_DVBSKY_T982:
/*
* The only boards we handle right now. However other boards
* using the CX2388x integrated IR controller should be similar
*/
break;
default:
return;
}
overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);
data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);
if (overrun) {
/* If there was a FIFO overrun, stop the device */
v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
params.enable = false;
/* Mitigate race with cx23885_input_ir_stop() */
params.shutdown = atomic_read(&dev->ir_input_stopping);
v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
}
if (data_available)
cx23885_input_process_measurements(dev, overrun);
if (overrun) {
/* If there was a FIFO overrun, clear & restart the device */
params.enable = true;
/* Mitigate race with cx23885_input_ir_stop() */
params.shutdown = atomic_read(&dev->ir_input_stopping);
v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
}
}
static int cx23885_input_ir_start(struct cx23885_dev *dev)
{
struct v4l2_subdev_ir_parameters params;
if (dev->sd_ir == NULL)
return -ENODEV;
atomic_set(&dev->ir_input_stopping, 0);
v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
switch (dev->board) {
case CX23885_BOARD_HAUPPAUGE_HVR1270:
case CX23885_BOARD_HAUPPAUGE_HVR1850:
case CX23885_BOARD_HAUPPAUGE_HVR1290:
case CX23885_BOARD_HAUPPAUGE_HVR1250:
case CX23885_BOARD_MYGICA_X8507:
case CX23885_BOARD_DVBSKY_T9580:
case CX23885_BOARD_DVBSKY_T980C:
case CX23885_BOARD_DVBSKY_S950C:
case CX23885_BOARD_TT_CT2_4500_CI:
case CX23885_BOARD_DVBSKY_S950:
case CX23885_BOARD_DVBSKY_S952:
case CX23885_BOARD_DVBSKY_T982:
/*
* The IR controller on this board only returns pulse widths.
* Any other mode setting will fail to set up the device.
*/
params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
params.enable = true;
params.interrupt_enable = true;
params.shutdown = false;
/* Setup for baseband compatible with both RC-5 and RC-6A */
params.modulation = false;
/* RC-5: 2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
/* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
params.max_pulse_width = 3333333; /* ns */
/* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
/* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
params.noise_filter_min_width = 333333; /* ns */
/*
* This board has inverted receive sense:
* mark is received as low logic level;
* falling edges are detected as rising edges; etc.
*/
params.invert_level = true;
break;
case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
case CX23885_BOARD_TEVII_S470:
case CX23885_BOARD_TBS_6980:
case CX23885_BOARD_TBS_6981:
/*
* The IR controller on this board only returns pulse widths.
* Any other mode setting will fail to set up the device.
*/
params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
params.enable = true;
params.interrupt_enable = true;
params.shutdown = false;
/* Setup for a standard NEC protocol */
params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
params.carrier_range_lower = 33000; /* Hz */
params.carrier_range_upper = 43000; /* Hz */
params.duty_cycle = 33; /* percent, 33 percent for NEC */
/*
* NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
* (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
*/
params.max_pulse_width = 12378022; /* ns */
/*
* NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
* (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
*/
params.noise_filter_min_width = 351648; /* ns */
params.modulation = false;
params.invert_level = true;
break;
}
v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
return 0;
}
static int cx23885_input_ir_open(struct rc_dev *rc)
{
struct cx23885_kernel_ir *kernel_ir = rc->priv;
if (kernel_ir->cx == NULL)
return -ENODEV;
return cx23885_input_ir_start(kernel_ir->cx);
}
static void cx23885_input_ir_stop(struct cx23885_dev *dev)
{
struct v4l2_subdev_ir_parameters params;
if (dev->sd_ir == NULL)
return;
/*
* Stop the sd_ir subdevice from generating notifications and
* scheduling work.
* It is shutdown this way in order to mitigate a race with
* cx23885_input_rx_work_handler() in the overrun case, which could
* re-enable the subdevice.
*/
atomic_set(&dev->ir_input_stopping, 1);
v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
while (params.shutdown == false) {
params.enable = false;
params.interrupt_enable = false;
params.shutdown = true;
v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);
v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);
}
flush_work(&dev->cx25840_work);
flush_work(&dev->ir_rx_work);
flush_work(&dev->ir_tx_work);
}
static void cx23885_input_ir_close(struct rc_dev *rc)
{
struct cx23885_kernel_ir *kernel_ir = rc->priv;
if (kernel_ir->cx != NULL)
cx23885_input_ir_stop(kernel_ir->cx);
}
int cx23885_input_init(s
