drivers/media/IR/ene_ir.c

/*
 * driver for ENE KB3926 B/C/D CIR (pnp id: ENE0XXX)
 *
 * Copyright (C) 2010 Maxim Levitsky <maximlevitsky@gmail.com>
 *
 * 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.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/pnp.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <media/ir-core.h>
#include <media/ir-common.h>
#include "ene_ir.h"


static int sample_period = -1;
static int enable_idle = 1;
static int input = 1;
static int debug;
static int txsim;

static int ene_irq_status(struct ene_device *dev);

/* read a hardware register */
static u8 ene_hw_read_reg(struct ene_device *dev, u16 reg)
{
	u8 retval;
	outb(reg >> 8, dev->hw_io + ENE_ADDR_HI);
	outb(reg & 0xFF, dev->hw_io + ENE_ADDR_LO);
	retval = inb(dev->hw_io + ENE_IO);

	ene_dbg_verbose("reg %04x == %02x", reg, retval);
	return retval;
}

/* write a hardware register */
static void ene_hw_write_reg(struct ene_device *dev, u16 reg, u8 value)
{
	outb(reg >> 8, dev->hw_io + ENE_ADDR_HI);
	outb(reg & 0xFF, dev->hw_io + ENE_ADDR_LO);
	outb(value, dev->hw_io + ENE_IO);

	ene_dbg_verbose("reg %04x <- %02x", reg, value);
}

/* change specific bits in hardware register */
static void ene_hw_write_reg_mask(struct ene_device *dev,
				  u16 reg, u8 value, u8 mask)
{
	u8 regvalue;

	outb(reg >> 8, dev->hw_io + ENE_ADDR_HI);
	outb(reg & 0xFF, dev->hw_io + ENE_ADDR_LO);

	regvalue = inb(dev->hw_io + ENE_IO) & ~mask;
	regvalue |= (value & mask);
	outb(regvalue, dev->hw_io + ENE_IO);

	ene_dbg_verbose("reg %04x <- %02x (mask=%02x)", reg, value, mask);
}

/* detect hardware features */
static int ene_hw_detect(struct ene_device *dev)
{
	u8 chip_major, chip_minor;
	u8 hw_revision, old_ver;
	u8 tmp;
	u8 fw_capabilities;
	int pll_freq;

	tmp = ene_hw_read_reg(dev, ENE_HW_UNK);
	ene_hw_write_reg(dev, ENE_HW_UNK, tmp & ~ENE_HW_UNK_CLR);

	chip_major = ene_hw_read_reg(dev, ENE_HW_VER_MAJOR);
	chip_minor = ene_hw_read_reg(dev, ENE_HW_VER_MINOR);

	ene_hw_write_reg(dev, ENE_HW_UNK, tmp);
	hw_revision = ene_hw_read_reg(dev, ENE_HW_VERSION);
	old_ver = ene_hw_read_reg(dev, ENE_HW_VER_OLD);

	pll_freq = (ene_hw_read_reg(dev, ENE_PLLFRH) << 4) +
		(ene_hw_read_reg(dev, ENE_PLLFRL) >> 4);

	if (pll_freq != 1000)
		dev->rx_period_adjust = 4;
	else
		dev->rx_period_adjust = 2;


	ene_printk(KERN_NOTICE, "PLL freq = %d\n", pll_freq);

	if (hw_revision == 0xFF) {

		ene_printk(KERN_WARNING, "device seems to be disabled\n");
		ene_printk(KERN_WARNING,
			"send a mail to lirc-list@lists.sourceforge.net\n");
		ene_printk(KERN_WARNING, "please attach output of acpidump\n");
		return -ENODEV;
	}

	if (chip_major == 0x33) {
		ene_printk(KERN_WARNING, "chips 0x33xx aren't supported\n");
		return -ENODEV;
	}

	if (chip_major == 0x39 && chip_minor == 0x26 && hw_revision == 0xC0) {
		dev->hw_revision = ENE_HW_C;
	} else if (old_ver == 0x24 && hw_revision == 0xC0) {
		dev->hw_revision = ENE_HW_B;
		ene_printk(KERN_NOTICE, "KB3926B detected\n");
	} else {
		dev->hw_revision = ENE_HW_D;
		ene_printk(KERN_WARNING,
			"unknown ENE chip detected, assuming KB3926D\n");
		ene_printk(KERN_WARNING,
			"driver support might be not complete");

	}

	ene_printk(KERN_DEBUG,
		"chip is 0x%02x%02x - kbver = 0x%02x, rev = 0x%02x\n",
			chip_major, chip_minor, old_ver, hw_revision);

	/* detect features hardware supports */
	if (dev->hw_revision < ENE_HW_C)
		return 0;

	fw_capabilities = ene_hw_read_reg(dev, ENE_FW2);
	ene_dbg("Firmware capabilities: %02x", fw_capabilities);

	dev->hw_gpio40_learning = fw_capabilities & ENE_FW2_GP40_AS_LEARN;
	dev->hw_learning_and_tx_capable = fw_capabilities & ENE_FW2_LEARNING;

	dev->hw_fan_as_normal_input = dev->hw_learning_and_tx_capable &&
	    (fw_capabilities & ENE_FW2_FAN_AS_NRML_IN);

	ene_printk(KERN_NOTICE, "hardware features:\n");
	ene_printk(KERN_NOTICE,
		"learning and transmit %s, gpio40_learn %s, fan_in %s\n",
	       dev->hw_learning_and_tx_capable ? "on" : "off",
	       dev->hw_gpio40_learning ? "on" : "off",
	       dev->hw_fan_as_normal_input ? "on" : "off");

	if (dev->hw_learning_and_tx_capable) {
		ene_printk(KERN_WARNING,
		"Device supports transmitting, but that support is\n");
		ene_printk(KERN_WARNING,
		"lightly tested. Please test it and mail\n");
		ene_printk(KERN_WARNING,
		"lirc-list@lists.sourceforge.net\n");
	}
	return 0;
}

/* this enables/disables IR input via gpio40*/
static void ene_enable_gpio40_receive(struct ene_device *dev, int enable)
{
	ene_hw_write_reg_mask(dev, ENE_CIR_CONF2, enable ?
			      0 : ENE_CIR_CONF2_GPIO40DIS,
			      ENE_CIR_CONF2_GPIO40DIS);
}

/* this enables/disables IR via standard input */
static void ene_enable_normal_receive(struct ene_device *dev, int enable)
{
	ene_hw_write_reg(dev, ENE_CIR_CONF1, enable ? ENE_CIR_CONF1_RX_ON : 0);
}

/* this enables/disables IR input via unused fan tachtometer input */
static void ene_enable_fan_receive(struct ene_device *dev, int enable)
{
	if (!enable)
		ene_hw_write_reg(dev, ENE_FAN_AS_IN1, 0);
	else {
		ene_hw_write_reg(dev, ENE_FAN_AS_IN1, ENE_FAN_AS_IN1_EN);
		ene_hw_write_reg(dev, ENE_FAN_AS_IN2, ENE_FAN_AS_IN2_EN);
	}
	dev->rx_fan_input_inuse = enable;
}


/* Sense current received carrier */
static int ene_rx_sense_carrier(struct ene_device *dev)
{
	int period = ene_hw_read_reg(dev, ENE_RX_CARRIER);
	int carrier;
	ene_dbg("RX: hardware carrier period = %02x", period);

	if (!(period & ENE_RX_CARRIER_VALID))
		return 0;

	period &= ~ENE_RX_CARRIER_VALID;

	if (!period)
		return 0;

	carrier = 2000000 / period;
	ene_dbg("RX: sensed carrier = %d Hz", carrier);
	return carrier;
}

/* determine which input to use*/
static void ene_rx_set_inputs(struct ene_device *dev)
{
	int learning_mode = dev->learning_enabled;

	ene_dbg("RX: setup receiver, learning mode = %d", learning_mode);

	ene_enable_normal_receive(dev, 1);

	/* old hardware doesn't support learning mode for sure */
	if (dev->hw_revision <= ENE_HW_B)
		return;

	/* receiver not learning capable, still set gpio40 correctly */
	if (!dev->hw_learning_and_tx_capable) {
		ene_enable_gpio40_receive(dev, !dev->hw_gpio40_learning);
		return;
	}

	/* enable learning mode */
	if (learning_mode) {
		ene_enable_gpio40_receive(dev, dev->hw_gpio40_learning);

		/* fan input is not used for learning */
		if (dev->hw_fan_as_normal_input)
			ene_enable_fan_receive(dev, 0);

	/* disable learning mode */
	} else {
		if (dev->hw_fan_as_normal_input) {
			ene_enable_fan_receive(dev, 1);
			ene_enable_normal_receive(dev, 0);
		} else
			ene_enable_gpio40_receive(dev,
					!dev->hw_gpio40_learning);
	}

	/* set few additional settings for this mode */
	ene_hw_write_reg_mask(dev, ENE_CIR_CONF1, learning_mode ?
			      ENE_CIR_CONF1_LEARN1 : 0, ENE_CIR_CONF1_LEARN1);

	ene_hw_write_reg_mask(dev, ENE_CIR_CONF2, learning_mode ?
			      ENE_CIR_CONF2_LEARN2 : 0, ENE_CIR_CONF2_LEARN2);

	if (dev->rx_fan_input_inuse) {
		dev->props->rx_resolution = ENE_SAMPLE_PERIOD_FAN * 1000;

		dev->props->timeout =
			ENE_FAN_VALUE_MASK * ENE_SAMPLE_PERIOD_FAN * 1000;
	} else {
		dev->props->rx_resolution = sample_period * 1000;
		dev->props->timeout = ENE_MAXGAP * 1000;
	}
}

/* Enable the device for receive */
static void ene_rx_enable(struct ene_device *dev)
{
	u8 reg_value;

	if (dev->hw_revision < ENE_HW_C) {
		ene_hw_write_reg(dev, ENEB_IRQ, dev->irq << 1);
		ene_hw_write_reg(dev, ENEB_IRQ_UNK1, 0x01);
	} else {
		reg_value = ene_hw_read_reg(dev, ENEC_IRQ) & 0xF0;
		reg_value |= ENEC_IRQ_UNK_EN;
		reg_value &= ~ENEC_IRQ_STATUS;
		reg_value |= (dev->irq & ENEC_IRQ_MASK);
		ene_hw_write_reg(dev, ENEC_IRQ, reg_value);
		ene_hw_write_reg(dev, ENE_TX_UNK1, 0x63);
	}

	ene_hw_write_reg(dev, ENE_CIR_CONF2, 0x00);
	ene_rx_set_inputs(dev);

	/* set sampling period */
	ene_hw_write_reg(dev, ENE_CIR_SAMPLE_PERIOD, sample_period);

	/* ack any pending irqs - just in case */
	ene_irq_status(dev);

	/* enable firmware bits */
	ene_hw_write_reg_mask(dev, ENE_FW1,
			      ENE_FW1_ENABLE | ENE_FW1_IRQ,
			      ENE_FW1_ENABLE | ENE_FW1_IRQ);

	/* enter idle mode */
	ir_raw_event_set_idle(dev->idev, 1);
	ir_raw_event_reset(dev->idev);

}

/* Disable the device receiver */
static void ene_rx_disable(struct ene_device *dev)
{
	/* disable inputs */
	ene_enable_normal_receive(dev, 0);

	if (dev->hw_fan_as_normal_input)
		ene_enable_fan_receive(dev, 0);

	/* disable hardware IRQ and firmware flag */
	ene_hw_write_reg_mask(dev, ENE_FW1, 0, ENE_FW1_ENABLE | ENE_FW1_IRQ);

	ir_raw_event_set_idle(dev->idev, 1);
	ir_raw_event_reset(dev->idev);
}


/* prepare transmission */
static void ene_tx_prepare(struct ene_device *dev)
{
	u8 conf1;

	conf1 = ene_hw_read_reg(dev, ENE_CIR_CONF1);
	dev->saved_conf1 = conf1;

	if (dev->hw_revision == ENE_HW_C)
		conf1 &= ~ENE_CIR_CONF1_TX_CLEAR;

	/* Enable TX engine */
	conf1 |= ENE_CIR_CONF1_TX_ON;

	/* Set carrier */
	if (dev->tx_period) {

		/* NOTE: duty cycle handling is just a guess, it might
			not be aviable. Default values were tested */
		int tx_period_in500ns = dev->tx_period * 2;

		int tx_pulse_width_in_500ns =
			tx_period_in500ns / (100 / dev->tx_duty_cycle);

		if (!tx_pulse_width_in_500ns)
			tx_pulse_width_in_500ns = 1;

		ene_dbg("TX: pulse distance = %d * 500 ns", tx_period_in500ns);
		ene_dbg("TX: pulse width = %d * 500 ns",
						tx_pulse_width_in_500ns);

		ene_hw_write_reg(dev, ENE_TX_PERIOD, ENE_TX_PERIOD_UNKBIT |
					tx_period_in500ns);

		ene_hw_write_reg(dev, ENE_TX_PERIOD_PULSE,
					tx_pulse_width_in_500ns);

		conf1 |= ENE_CIR_CONF1_TX_CARR;
	} else
		conf1 &= ~ENE_CIR_CONF1_TX_CARR;

	ene_hw_write_reg(dev, ENE_CIR_CONF1, conf1);

}

/* end transmission */
static void ene_tx_complete(struct ene_device *dev)
{
	ene_hw_write_reg(dev, ENE_CIR_CONF1, dev->saved_conf1);
	dev->tx_buffer = NULL;
}

/* set transmit mask */
static void ene_tx_hw_set_transmiter_mask(struct ene_device *dev)
{
	u8 txport1 = ene_hw_read_reg(dev, ENE_TX_PORT1) & ~ENE_TX_PORT1_EN;
	u8 txport2 = ene_hw_read_reg(dev, ENE_TX_PORT2) & ~ENE_TX_PORT2_EN;

	if (dev->transmitter_mask & 0x01)
		txport1 |= ENE_TX_PORT1_EN;

	if (dev->transmitter_mask & 0x02)
		txport2 |= ENE_TX_PORT2_EN;

	ene_hw_write_reg(dev, ENE_TX_PORT1, txport1);
	ene_hw_write_reg(dev, ENE_TX_PORT2, txport2);
}

/* TX one sample - must be called with dev->hw_lock*/
static void ene_tx_sample(struct ene_device *dev)
{
	u8 raw_tx;
	u32 sample;

	if (!dev->tx_buffer) {
		ene_dbg("TX: attempt to transmit NULL buffer");
		return;
	}

	/* Grab next TX sample */
	if (!dev->tx_sample) {
again:
		if (dev->tx_pos == dev->tx_len + 1) {
			if (!dev->tx_done) {
				ene_dbg("TX: no more data to send");
				dev->tx_done = 1;
				goto exit;
			} else {
				ene_dbg("TX: last sample sent by hardware");
				ene_tx_complete(dev);
				complete(&dev->tx_complete);
				return;
			}
		}

		sample = dev->tx_buffer[dev->tx_pos++];
		dev->tx_sample_pulse = !dev->tx_sample_pulse;

		ene_dbg("TX: sample %8d (%s)", sample, dev->tx_sample_pulse ?
							"pulse" : "space");

		dev->tx_sample = DIV_ROUND_CLOSEST(sample, ENE_TX_SMPL_PERIOD);

		/* guard against too short samples */
		if (!dev->tx_sample)
			goto again;
	}

	raw_tx = min(dev->tx_sample , (unsigned int)ENE_TX_SMLP_MASK);
	dev->tx_sample -= raw_tx;

	if (dev->tx_sample_pulse)
		raw_tx |= ENE_TX_PULSE_MASK;

	ene_hw_write_reg(dev, ENE_TX_INPUT1 + dev->tx_reg, raw_tx);
	dev->tx_reg = !dev->tx_reg;
exit:
	/* simulate TX done interrupt */
	if (txsim)
		mod_timer(&dev->tx_sim_timer, jiffies + HZ / 500);
}

/* timer to simulate tx done interrupt */
static void ene_tx_irqsim(unsigned long data)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;

	spin_lock_irqsave(&dev->hw_lock, flags);
	ene_tx_sample(dev);
	spin_unlock_irqrestore(&dev->hw_lock, flags);
}


/* read irq status and ack it */
static int ene_irq_status(struct ene_device *dev)
{
	u8 irq_status;
	u8 fw_flags1, fw_flags2;
	int cur_rx_pointer;
	int retval = 0;

	fw_flags2 = ene_hw_read_reg(dev, ENE_FW2);
	cur_rx_pointer = !!(fw_flags2 & ENE_FW2_BUF_HIGH);

	if (dev->hw_revision < ENE_HW_C) {
		irq_status = ene_hw_read_reg(dev, ENEB_IRQ_STATUS);

		if (!(irq_status & ENEB_IRQ_STATUS_IR))
			return 0;

		ene_hw_write_reg(dev, ENEB_IRQ_STATUS,
				 irq_status & ~ENEB_IRQ_STATUS_IR);
		dev->rx_pointer = cur_rx_pointer;
		return ENE_IRQ_RX;
	}

	irq_status = ene_hw_read_reg(dev, ENEC_IRQ);

	if (!(irq_status & ENEC_IRQ_STATUS))
		return 0;

	/* original driver does that twice - a workaround ? */
	ene_hw_write_reg(dev, ENEC_IRQ, irq_status & ~ENEC_IRQ_STATUS);
	ene_hw_write_reg(dev, ENEC_IRQ, irq_status & ~ENEC_IRQ_STATUS);

	/* clear unknown flag in F8F9 */
	if (fw_flags2 & ENE_FW2_IRQ_CLR)
		ene_hw_write_reg(dev, ENE_FW2, fw_flags2 & ~ENE_FW2_IRQ_CLR);

	/* check if this is a TX interrupt */
	fw_flags1 = ene_hw_read_reg(dev, ENE_FW1);
	if (fw_flags1 & ENE_FW1_TXIRQ) {
		ene_hw_write_reg(dev, ENE_FW1, fw_flags1 & ~ENE_FW1_TXIRQ);
		retval |= ENE_IRQ_TX;
	}

	/* Check if this is RX interrupt */
	if (dev->rx_pointer != cur_rx_pointer) {
		retval |= ENE_IRQ_RX;
		dev->rx_pointer = cur_rx_pointer;

	} else if (!(retval & ENE_IRQ_TX)) {
		ene_dbg("RX: interrupt without change in RX pointer(%d)",
			dev->rx_pointer);
		retval |= ENE_IRQ_RX;
	}

	if ((retval & ENE_IRQ_RX) && (retval & ENE_IRQ_TX))
		ene_dbg("both RX and TX interrupt at same time");

	return retval;
}

/* interrupt handler */
static irqreturn_t ene_isr(int irq, void *data)
{
	u16 hw_value;
	int i, hw_sample;
	int pulse;
	int irq_status;
	unsigned long flags;
	int carrier = 0;
	irqreturn_t retval = IRQ_NONE;
	struct ene_device *dev = (struct ene_device *)data;
	struct ir_raw_event ev;


	spin_lock_irqsave(&dev->hw_lock, flags);
	irq_status = ene_irq_status(dev);

	if (!irq_status)
		goto unlock;

	retval = IRQ_HANDLED;

	if (irq_status & ENE_IRQ_TX) {

		if (!dev->hw_learning_and_tx_capable) {
			ene_dbg("TX interrupt on unsupported device!");
			goto unlock;
		}
		ene_tx_sample(dev);
	}

	if (!(irq_status & ENE_IRQ_RX))
		goto unlock;


	if (dev->carrier_detect_enabled || debug)
		carrier = ene_rx_sense_carrier(dev);
#if 0
	/* TODO */
	if (dev->carrier_detect_enabled && carrier)
		ir_raw_event_report_frequency(dev->idev, carrier);
#endif

	for (i = 0; i < ENE_SAMPLES_SIZE; i++) {
		hw_value = ene_hw_read_reg(dev,
				ENE_SAMPLE_BUFFER + dev->rx_pointer * 4 + i);

		if (dev->rx_fan_input_inuse) {
			/* read high part of the sample */
			hw_value |= ene_hw_read_reg(dev,
			    ENE_SAMPLE_BUFFER_FAN +
					dev->rx_pointer * 4 + i) << 8;
			pulse = hw_value & ENE_FAN_SMPL_PULS_MSK;

			/* clear space bit, and other unused bits */
			hw_value &= ENE_FAN_VALUE_MASK;
			hw_sample = hw_value * ENE_SAMPLE_PERIOD_FAN;

		} else {
			pulse = !(hw_value & ENE_SAMPLE_SPC_MASK);
			hw_value &= ENE_SAMPLE_VALUE_MASK;
			hw_sample = hw_value * sample_period;

			if (dev->rx_period_adjust) {
				hw_sample *= (100 - dev->rx_period_adjust);
				hw_sample /= 100;
			}
		}
		/* no more data */
		if (!(hw_value))
			break;

		ene_dbg("RX: %d (%s)", hw_sample, pulse ? "pulse" : "space");


		ev.duration = hw_sample * 1000;
		ev.pulse = pulse;
		ir_raw_event_store_with_filter(dev->idev, &ev);
	}

	ir_raw_event_handle(dev->idev);
unlock:
	spin_unlock_irqrestore(&dev->hw_lock, flags);
	return retval;
}

/* Initialize default settings */
static void ene_setup_settings(struct ene_device *dev)
{
	dev->tx_period = 32;
	dev->tx_duty_cycle = 25; /*%*/
	dev->transmitter_mask = 3;

	/* Force learning mode if (input == 2), otherwise
		let user set it with LIRC_SET_REC_CARRIER */
	dev->learning_enabled =
		(input == 2 && dev->hw_learning_and_tx_capable);

	dev->rx_pointer = -1;

}

/* outside interface: called on first open*/
static int ene_open(void *data)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;

	spin_lock_irqsave(&dev->hw_lock, flags);
	dev->in_use = 1;
	ene_setup_settings(dev);
	ene_rx_enable(dev);
	spin_unlock_irqrestore(&dev->hw_lock, flags);
	return 0;
}

/* outside interface: called on device close*/
static void ene_close(void *data)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;
	spin_lock_irqsave(&dev->hw_lock, flags);

	ene_rx_disable(dev);
	dev->in_use = 0;
	spin_unlock_irqrestore(&dev->hw_lock, flags);
}

/* outside interface: set transmitter mask */
static int ene_set_tx_mask(void *data, u32 tx_mask)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;
	ene_dbg("TX: attempt to set transmitter mask %02x", tx_mask);

	/* invalid txmask */
	if (!tx_mask || tx_mask & ~0x3) {
		ene_dbg("TX: invalid mask");
		/* return count of transmitters */
		return 2;
	}

	spin_lock_irqsave(&dev->hw_lock, flags);
	dev->transmitter_mask = tx_mask;
	spin_unlock_irqrestore(&dev->hw_lock, flags);
	return 0;
}

/* outside interface : set tx carrier */
static int ene_set_tx_carrier(void *data, u32 carrier)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;
	u32 period = 1000000 / carrier; /* (1 / freq) (* # usec in 1 sec) */

	ene_dbg("TX: attempt to set tx carrier to %d kHz", carrier);

	if (period && (period > ENE_TX_PERIOD_MAX ||
			period < ENE_TX_PERIOD_MIN)) {

		ene_dbg("TX: out of range %d-%d carrier, "
			"falling back to 32 kHz",
			1000 / ENE_TX_PERIOD_MIN,
			1000 / ENE_TX_PERIOD_MAX);

		period = 32; /* this is just a coincidence!!! */
	}
	ene_dbg("TX: set carrier to %d kHz", carrier);

	spin_lock_irqsave(&dev->hw_lock, flags);
	dev->tx_period = period;
	spin_unlock_irqrestore(&dev->hw_lock, flags);
	return 0;
}


/* outside interface: enable learning mode */
static int ene_set_learning_mode(void *data, int enable)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;
	if (enable == dev->learning_enabled)
		return 0;

	spin_lock_irqsave(&dev->hw_lock, flags);
	dev->learning_enabled = enable;
	ene_rx_set_inputs(dev);
	spin_unlock_irqrestore(&dev->hw_lock, flags);
	return 0;
}

/* outside interface: set rec carrier */
static int ene_set_rec_carrier(void *data, u32 min, u32 max)
{
	struct ene_device *dev = (struct ene_device *)data;
	ene_set_learning_mode(dev,
		max > ENE_NORMAL_RX_HI || min < ENE_NORMAL_RX_LOW);
	return 0;
}

/* outside interface: enable or disable idle mode */
static void ene_rx_set_idle(void *data, int idle)
{
	struct ene_device *dev = (struct ene_device *)data;
	ene_dbg("%sabling idle mode", idle ? "en" : "dis");

	ene_hw_write_reg_mask(dev, ENE_CIR_SAMPLE_PERIOD,
		(enable_idle && idle) ? 0 : ENE_CIR_SAMPLE_OVERFLOW,
			ENE_CIR_SAMPLE_OVERFLOW);
}


/* outside interface: transmit */
static int ene_transmit(void *data, int *buf, u32 n)
{
	struct ene_device *dev = (struct ene_device *)data;
	unsigned long flags;

	dev->tx_buffer = buf;
	dev->tx_len = n / sizeof(int);
	dev->tx_pos = 0;
	dev->tx_reg = 0;
	dev->tx_done = 0;
	dev->tx_sample = 0;
	dev->tx_sample_pulse = 0;

	ene_dbg("TX: %d samples", dev->tx_len);

	spin_lock_irqsave(&dev->hw_lock, flags);

	ene_tx_hw_set_transmiter_mask(dev);
	ene_tx_prepare(dev);

	/* Transmit first two samples */
	ene_tx_sample(dev);
	ene_tx_sample(dev);

	spin_unlock_irqrestore(&dev->hw_lock, flags);

	if (wait_for_completion_timeout(&dev->tx_complete, 2 * HZ) == 0) {
		ene_dbg("TX: timeout");
		spin_lock_irqsave(&dev->hw_lock, flags);
		ene_tx_complete(dev);
		spin_unlock_irqrestore(&dev->hw_lock, flags);
	} else
		ene_dbg("TX: done");
	return n;
}


/* probe entry */
static int ene_probe(struct pnp_dev *pnp_dev, const struct pnp_device_id *id)
{
	int error = -ENOMEM;
	struct ir_dev_props *ir_props;
	struct input_dev *input_dev;
	struct ene_device *dev;

	/* allocate memory */
	input_dev = input_allocate_device();
	ir_props = kzalloc(sizeof(struct ir_dev_props), GFP_KERNEL);
	dev = kzalloc(sizeof(struct ene_device), GFP_KERNEL);

	if (!input_dev || !ir_props || !dev)
		goto error;

	/* validate resources */
	error = -ENODEV;

	if (!pnp_port_valid(pnp_dev, 0) ||
	    pnp_port_len(pnp_dev, 0) < ENE_MAX_IO)
		goto error;

	if (!pnp_irq_valid(pnp_dev, 0))
		goto error;

	dev->hw_io = pnp_port_start(pnp_dev, 0);
	dev->irq = pnp_irq(pnp_dev, 0);
	spin_lock_init(&dev->hw_lock);

	/* claim the resources */
	error = -EBUSY;
	if (!request_region(dev->hw_io, ENE_MAX_IO, ENE_DRIVER_NAME))
		goto error;

	if (request_irq(dev->irq, ene_isr,
			IRQF_SHARED, ENE_DRIVER_NAME, (void *)dev))
		goto error;

	pnp_set_drvdata(pnp_dev, dev);
	dev->pnp_dev = pnp_dev;

	/* detect hardware version and features */
	error = ene_hw_detect(dev);
	if (error)
		goto error;

	ene_setup_settings(dev);

	if (!dev->hw_learning_and_tx_capable && txsim) {
		dev->hw_learning_and_tx_capable = 1;
		setup_timer(&dev->tx_sim_timer, ene_tx_irqsim,
						(long unsigned int)dev);
		ene_printk(KERN_WARNING,
			"Simulation of TX activated\n");
	}

	ir_props->driver_type = RC_DRIVER_IR_RAW;
	ir_props->allowed_protos = IR_TYPE_ALL;
	ir_props->priv = dev;
	ir_props->open = ene_open;
	ir_props->close = ene_close;
	ir_props->min_timeout = ENE_MINGAP * 1000;
	ir_props->max_timeout = ENE_MAXGAP * 1000;
	ir_props->timeout = ENE_MAXGAP * 1000;

	if (dev->hw_revision == ENE_HW_B)
		ir_props->s_idle = ene_rx_set_idle;


	dev->props = ir_props;
	dev->idev = input_dev;

	/* don't allow too short/long sample periods */
	if (sample_period < 5 || sample_period > 0x7F)
		sample_period = -1;

	/* choose default sample period */
	if (sample_period == -1) {

		sample_period = 50;

		/* on revB, hardware idle mode eats first sample
		  if we set too low sample period */
		if (dev->hw_revision == ENE_HW_B && enable_idle)
			sample_period = 75;
	}

	ir_props->rx_resolution = sample_period * 1000;

	if (dev->hw_learning_and_tx_capable) {

		ir_props->s_learning_mode = ene_set_learning_mode;

		if (input == 0)
			ir_props->s_rx_carrier_range = ene_set_rec_carrier;

		init_completion(&dev->tx_complete);
		ir_props->tx_ir = ene_transmit;
		ir_props->s_tx_mask = ene_set_tx_mask;
		ir_props->s_tx_carrier = ene_set_tx_carrier;
		ir_props->tx_resolution = ENE_TX_SMPL_PERIOD * 1000;
		/* ir_props->s_carrier_report = ene_set_carrier_report; */
	}


	device_set_wakeup_capable(&pnp_dev->dev, 1);
	device_set_wakeup_enable(&pnp_dev->dev, 1);

	if (dev->hw_learning_and_tx_capable)
		input_dev->name = "ENE eHome Infrared Remote Transceiver";
	else
		input_dev->name = "ENE eHome Infrared Remote Receiver";


	error = -ENODEV;
	if (ir_input_register(input_dev, RC_MAP_RC6_MCE, ir_props,
							ENE_DRIVER_NAME))
		goto error;


	ene_printk(KERN_NOTICE, "driver has been succesfully loaded\n");
	return 0;
error:
	if (dev->irq)
		free_irq(dev->irq, dev);
	if (dev->hw_io)
		release_region(dev->hw_io, ENE_MAX_IO);

	input_free_device(input_dev);
	kfree(ir_props);
	kfree(dev);
	return error;
}

/* main unload function */
static void ene_remove(struct pnp_dev *pnp_dev)
{
	struct ene_device *dev = pnp_get_drvdata(pnp_dev);
	unsigned long flags;

	spin_lock_irqsave(&dev->hw_lock, flags);
	ene_rx_disable(dev);
	spin_unlock_irqrestore(&dev->hw_lock, flags);

	free_irq(dev->irq, dev);
	release_region(dev->hw_io, ENE_MAX_IO);
	ir_input_unregister(dev->idev);
	kfree(dev->props);
	kfree(dev);
}

/* enable wake on IR (wakes on specific button on original remote) */
static void ene_enable_wake(struct ene_device *dev, int enable)
{
	enable = enable && device_may_wakeup(&dev->pnp_dev->dev);

	ene_dbg("wake on IR %s", enable ? "enabled" : "disabled");

	ene_hw_write_reg_mask(dev, ENE_FW1, enable ?
		ENE_FW1_WAKE : 0, ENE_FW1_WAKE);
}

#ifdef CONFIG_PM
static int ene_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
{
	struct ene_device *dev = pnp_get_drvdata(pnp_dev);
	ene_enable_wake(dev, 1);
	return 0;
}

static int ene_resume(struct pnp_dev *pnp_dev)
{
	struct ene_device *dev = pnp_get_drvdata(pnp_dev);
	if (dev->in_use)
		ene_rx_enable(dev);

	ene_enable_wake(dev, 0);
	return 0;
}
#endif

static void ene_shutdown(struct pnp_dev *pnp_dev)
{
	struct ene_device *dev = pnp_get_drvdata(pnp_dev);
	ene_enable_wake(dev, 1);
}

static const struct pnp_device_id ene_ids[] = {
	{.id = "ENE0100",},
	{.id = "ENE0200",},
	{.id = "ENE0201",},
	{.id = "ENE0202",},
	{},
};

static struct pnp_driver ene_driver = {
	.name = ENE_DRIVER_NAME,
	.id_table = ene_ids,
	.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,

	.probe = ene_probe,
	.remove = __devexit_p(ene_remove),
#ifdef CONFIG_PM
	.suspend = ene_suspend,
	.resume = ene_resume,
#endif
	.shutdown = ene_shutdown,
};

static int __init ene_init(void)
{
	return pnp_register_driver(&ene_driver);
}

static void ene_exit(void)
{
	pnp_unregister_driver(&ene_driver);
}

module_param(sample_period, int, S_IRUGO);
MODULE_PARM_DESC(sample_period, "Hardware sample period (50 us default)");

module_param(enable_idle, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(enable_idle,
	"Enables turning off signal sampling after long inactivity time; "
	"if disabled might help detecting input signal (default: enabled)"
	" (KB3926B only)");

module_param(input, bool, S_IRUGO);
MODULE_PARM_DESC(input, "select which input to use "
	"0 - auto, 1 - standard, 2 - wideband(KB3926C+)");

module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable debug (debug=2 verbose debug output)");

module_param(txsim, bool, S_IRUGO);
MODULE_PARM_DESC(txsim,
	"Simulate TX features on unsupported hardware (dangerous)");

MODULE_DEVICE_TABLE(pnp, ene_ids);
MODULE_DESCRIPTION
	("Infrared input driver for KB3926B/KB3926C/KB3926D "
	"(aka ENE0100/ENE0200/ENE0201) CIR port");

MODULE_AUTHOR("Maxim Levitsky");
MODULE_LICENSE("GPL");

module_init(ene_init);
module_exit(ene_exit);