path: root/drivers/media/rc/img-ir/img-ir-hw.c

/*
 * ImgTec IR Hardware Decoder found in PowerDown Controller.
 *
 * Copyright 2010-2014 Imagination Technologies Ltd.
 *
 * This ties into the input subsystem using the RC-core. Protocol support is
 * provided in separate modules which provide the parameters and scancode
 * translation functions to set up the hardware decoder and interpret the
 * resulting input.
 */

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <media/rc-core.h>
#include "img-ir.h"

/* Decoders lock (only modified to preprocess them) */
static DEFINE_SPINLOCK(img_ir_decoders_lock);

extern struct img_ir_decoder img_ir_nec;
extern struct img_ir_decoder img_ir_jvc;
extern struct img_ir_decoder img_ir_sony;
extern struct img_ir_decoder img_ir_sharp;
extern struct img_ir_decoder img_ir_sanyo;

static bool img_ir_decoders_preprocessed;
static struct img_ir_decoder *img_ir_decoders[] = {
#ifdef CONFIG_IR_IMG_NEC
	&img_ir_nec,
#endif
#ifdef CONFIG_IR_IMG_JVC
	&img_ir_jvc,
#endif
#ifdef CONFIG_IR_IMG_SONY
	&img_ir_sony,
#endif
#ifdef CONFIG_IR_IMG_SHARP
	&img_ir_sharp,
#endif
#ifdef CONFIG_IR_IMG_SANYO
	&img_ir_sanyo,
#endif
	NULL
};

#define IMG_IR_F_FILTER		BIT(RC_FILTER_NORMAL)	/* enable filtering */
#define IMG_IR_F_WAKE		BIT(RC_FILTER_WAKEUP)	/* enable waking */

/* code type quirks */

#define IMG_IR_QUIRK_CODE_BROKEN	0x1	/* Decode is broken */
#define IMG_IR_QUIRK_CODE_LEN_INCR	0x2	/* Bit length needs increment */

/* functions for preprocessing timings, ensuring max is set */

static void img_ir_timing_preprocess(struct img_ir_timing_range *range,
				     unsigned int unit)
{
	if (range->max < range->min)
		range->max = range->min;
	if (unit) {
		/* multiply by unit and convert to microseconds */
		range->min = (range->min*unit)/1000;
		range->max = (range->max*unit + 999)/1000; /* round up */
	}
}

static void img_ir_symbol_timing_preprocess(struct img_ir_symbol_timing *timing,
					    unsigned int unit)
{
	img_ir_timing_preprocess(&timing->pulse, unit);
	img_ir_timing_preprocess(&timing->space, unit);
}

static void img_ir_timings_preprocess(struct img_ir_timings *timings,
				      unsigned int unit)
{
	img_ir_symbol_timing_preprocess(&timings->ldr, unit);
	img_ir_symbol_timing_preprocess(&timings->s00, unit);
	img_ir_symbol_timing_preprocess(&timings->s01, unit);
	img_ir_symbol_timing_preprocess(&timings->s10, unit);
	img_ir_symbol_timing_preprocess(&timings->s11, unit);
	/* default s10 and s11 to s00 and s01 if no leader */
	if (unit)
		/* multiply by unit and convert to microseconds (round up) */
		timings->ft.ft_min = (timings->ft.ft_min*unit + 999)/1000;
}

/* functions for filling empty fields with defaults */

static void img_ir_timing_defaults(struct img_ir_timing_range *range,
				   struct img_ir_timing_range *defaults)
{
	if (!range->min)
		range->min = defaults->min;
	if (!range->max)
		range->max = defaults->max;
}

static void img_ir_symbol_timing_defaults(struct img_ir_symbol_timing *timing,
					  struct img_ir_symbol_timing *defaults)
{
	img_ir_timing_defaults(&timing->pulse, &defaults->pulse);
	img_ir_timing_defaults(&timing->space, &defaults->space);
}

static void img_ir_timings_defaults(struct img_ir_timings *timings,
				    struct img_ir_timings *defaults)
{
	img_ir_symbol_timing_defaults(&timings->ldr, &defaults->ldr);
	img_ir_symbol_timing_defaults(&timings->s00, &defaults->s00);
	img_ir_symbol_timing_defaults(&timings->s01, &defaults->s01);
	img_ir_symbol_timing_defaults(&timings->s10, &defaults->s10);
	img_ir_symbol_timing_defaults(&timings->s11, &defaults->s11);
	if (!timings->ft.ft_min)
		timings->ft.ft_min = defaults->ft.ft_min;
}

/* functions for converting timings to register values */

/**
 * img_ir_control() - Convert control struct to control register value.
 * @control:	Control data
 *
 * Returns:	The control register value equivalent of @control.
 */
static u32 img_ir_control(const struct img_ir_control *control)
{
	u32 ctrl = control->code_type << IMG_IR_CODETYPE_SHIFT;
	if (control->decoden)
		ctrl |= IMG_IR_DECODEN;
	if (control->hdrtog)
		ctrl |= IMG_IR_HDRTOG;
	if (control->ldrdec)
		ctrl |= IMG_IR_LDRDEC;
	if (control->dec