Introduce the Counter character device interface

index 5283ff128c17..0caa60537b14 100644
@@ -28,6 +28,7 @@ MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
 
 /**
  * struct quad8 - device private data structure
+ * @lock:		lock to prevent clobbering device states during R/W ops
  * @counter:		instance of the counter_device
  * @fck_prescaler:	array of filter clock prescaler configurations
  * @preset:		array of preset values

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new file mode 100644
index 000000000000..14fe566aca0e
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Counter sysfs interface
+ * Copyright (C) 2020 William Breathitt Gray
+ */
+#ifndef _COUNTER_SYSFS_H_
+#define _COUNTER_SYSFS_H_
+
+#include <linux/counter.h>
+
+int counter_sysfs_add(struct counter_device *const counter);
+
+#endif /* _COUNTER_SYSFS_H_ */

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index c533a6ff12cf..3cda2c47bacb 100644
@@ -38,6 +38,9 @@ static struct bus_type counter_bus_type = {
  * This function registers a Counter to the system. A sysfs "counter" directory
  * will be created and populated with sysfs attributes correlating with the
  * Counter Signals, Synapses, and Counts respectively.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
  */
 int counter_register(struct counter_device *const counter)
 {

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new file mode 100644
index 000000000000..5529d16703c4
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Counter character device interface
+ * Copyright (C) 2020 William Breathitt Gray
+ */
+#ifndef _COUNTER_CHRDEV_H_
+#define _COUNTER_CHRDEV_H_
+
+#include <linux/counter.h>
+
+int counter_chrdev_add(struct counter_device *const counter);
+void counter_chrdev_remove(struct counter_device *const counter);
+
+#endif /* _COUNTER_CHRDEV_H_ */

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index 11bef9f8190f..df1d75e0d7b8 100644
@@ -588,6 +588,7 @@ static int counter_signal_attrs_create(struct counter_device *const counter,
 	int err;
 	struct counter_comp comp;
 	size_t i;
+	struct counter_comp *ext;
 
 	/* Create main Signal attribute */
 	comp = counter_signal_comp;

@@ -603,8 +604,14 @@ static int counter_signal_attrs_create(struct counter_device *const counter,
 
 	/* Create an attribute for each extension */
 	for (i = 0; i < signal->num_ext; i++) {
-		err = counter_attr_create(dev, cattr_group, signal->ext + i,
-					  scope, signal);
+		ext = &signal->ext[i];
+
+		err = counter_attr_create(dev, cattr_group, ext, scope, signal);
+		if (err < 0)
+			return err;
+
+		err = counter_comp_id_attr_create(dev, cattr_group, ext->name,
+						  i);
 		if (err < 0)
 			return err;
 	}

@@ -695,6 +702,7 @@ static int counter_count_attrs_create(struct counter_device *const counter,
 	int err;
 	struct counter_comp comp;
 	size_t i;
+	struct counter_comp *ext;
 
 	/* Create main Count attribute */
 	comp = counter_count_comp;

@@ -719,8 +727,14 @@ static int counter_count_attrs_create(struct counter_device *const counter,
 
 	/* Create an attribute for each extension */
 	for (i = 0; i < count->num_ext; i++) {
-		err = counter_attr_create(dev, cattr_group, count->ext + i,
-					  scope, count);
+		ext = &count->ext[i];
+
+		err = counter_attr_create(dev, cattr_group, ext, scope, count);
+		if (err < 0)
+			return err;
+
+		err = counter_comp_id_attr_create(dev, cattr_group, ext->name,
+						  i);
 		if (err < 0)
 			return err;
 	}

@@ -784,6 +798,7 @@ static int counter_sysfs_attr_add(struct counter_device *const counter,
 	struct device *const dev = &counter->dev;
 	int err;
 	size_t i;
+	struct counter_comp *ext;
 
 	/* Add Signals sysfs attributes */
 	err = counter_sysfs_signals_add(counter, cattr_group);

@@ -816,8 +831,14 @@ static int counter_sysfs_attr_add(struct counter_device *const counter,
 
 	/* Create an attribute for each extension */
 	for (i = 0; i < counter->num_ext; i++) {
-		err = counter_attr_create(dev, cattr_group, counter->ext + i,
-					  scope, NULL);
+		ext = &counter->ext[i];
+
+		err = counter_attr_create(dev, cattr_group, ext, scope, NULL);
+		if (err < 0)
+			return err;
+
+		err = counter_comp_id_attr_create(dev, cattr_group, ext->name,
+						  i);
 		if (err < 0)
 			return err;
 	}

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index c587f295d720..a56751bf1e9b 100644
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/types.h>
+#include <linux/spinlock.h>
 
 #define QUAD8_EXTENT 32
 

@@ -43,7 +44,7 @@ MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
  * @base:		base port address of the device
  */
 struct quad8 {
-	struct mutex lock;
+	spinlock_t lock;
 	struct counter_device counter;
 	unsigned int fck_prescaler[QUAD8_NUM_COUNTERS];
 	unsigned int preset[QUAD8_NUM_COUNTERS];

@@ -124,6 +125,7 @@ static int quad8_count_read(struct counter_device *counter,
 	unsigned int flags;
 	unsigned int borrow;
 	unsigned int carry;
+	unsigned long irqflags;
 	int i;
 
 	flags = inb(base_offset + 1);

@@ -133,7 +135,7 @@ static int quad8_count_read(struct counter_device *counter,
 	/* Borrow XOR Carry effectively doubles count range */
 	*val = (unsigned long)(borrow ^ carry) << 24;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	/* Reset Byte Pointer; transfer Counter to Output Latch */
 	outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT,

@@ -142,7 +144,7 @@ static int quad8_count_read(struct counter_device *counter,
 	for (i = 0; i < 3; i++)
 		*val |= (unsigned long)inb(base_offset) << (8 * i);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -152,13 +154,14 @@ static int quad8_count_write(struct counter_device *counter,
 {
 	struct quad8 *const priv = counter->priv;
 	const int base_offset = priv->base + 2 * count->id;
+	unsigned long irqflags;
 	int i;
 
 	/* Only 24-bit values are supported */
 	if (val > 0xFFFFFF)
 		return -ERANGE;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	/* Reset Byte Pointer */
 	outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);

@@ -183,7 +186,7 @@ static int quad8_count_write(struct counter_device *counter,
 	/* Reset Error flag */
 	outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -201,8 +204,9 @@ static int quad8_function_read(struct counter_device *counter,
 {
 	struct quad8 *const priv = counter->priv;
 	const int id = count->id;
+	unsigned long irqflags;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	if (priv->quadrature_mode[id])
 		switch (priv->quadrature_scale[id]) {

@@ -219,7 +223,7 @@ static int quad8_function_read(struct counter_device *counter,
 	else
 		*function = COUNTER_FUNCTION_PULSE_DIRECTION;
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -234,10 +238,11 @@ static int quad8_function_write(struct counter_device *counter,
 	unsigned int *const scale = priv->quadrature_scale + id;
 	unsigned int *const synchronous_mode = priv->synchronous_mode + id;
 	const int base_offset = priv->base + 2 * id + 1;
+	unsigned long irqflags;
 	unsigned int mode_cfg;
 	unsigned int idr_cfg;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	mode_cfg = priv->count_mode[id] << 1;
 	idr_cfg = priv->index_polarity[id] << 1;

@@ -272,7 +277,7 @@ static int quad8_function_write(struct counter_device *counter,
 			break;
 		default:
 			/* should never reach this path */
-			mutex_unlock(&priv->lock);
+			spin_unlock_irqrestore(&priv->lock, irqflags);
 			return -EINVAL;
 		}
 	}

@@ -280,7 +285,7 @@ static int quad8_function_write(struct counter_device *counter,
 	/* Load mode configuration to Counter Mode Register */
 	outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -406,9 +411,10 @@ static int quad8_index_polarity_set(struct counter_device *counter,
 	struct quad8 *const priv = counter->priv;
 	const size_t channel_id = signal->id - 16;
 	const int base_offset = priv->base + 2 * channel_id + 1;
+	unsigned long irqflags;
 	unsigned int idr_cfg = index_polarity << 1;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	idr_cfg |= priv->synchronous_mode[channel_id];
 

@@ -417,7 +423,7 @@ static int quad8_index_polarity_set(struct counter_device *counter,
 	/* Load Index Control configuration to Index Control Register */
 	outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -446,15 +452,16 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
 	struct quad8 *const priv = counter->priv;
 	const size_t channel_id = signal->id - 16;
 	const int base_offset = priv->base + 2 * channel_id + 1;
+	unsigned long irqflags;
 	unsigned int idr_cfg = synchronous_mode;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	idr_cfg |= priv->index_polarity[channel_id] << 1;
 
 	/* Index function must be non-synchronous in non-quadrature mode */
 	if (synchronous_mode && !priv->quadrature_mode[channel_id]) {
-		mutex_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->lock, irqflags);
 		return -EINVAL;
 	}
 

@@ -463,7 +470,7 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
 	/* Load Index Control configuration to Index Control Register */
 	outb(QUAD8_CTR_IDR | idr_cfg, base_offset);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -510,6 +517,7 @@ static int quad8_count_mode_write(struct counter_device *counter,
 	unsigned int count_mode;
 	unsigned int mode_cfg;
 	const int base_offset = priv->base + 2 * count->id + 1;
+	unsigned long irqflags;
 
 	/* Map Generic Counter count mode to 104-QUAD-8 count mode */
 	switch (cnt_mode) {

@@ -530,7 +538,7 @@ static int quad8_count_mode_write(struct counter_device *counter,
 		return -EINVAL;
 	}
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	priv->count_mode[count->id] = count_mode;
 

@@ -544,7 +552,7 @@ static int quad8_count_mode_write(struct counter_device *counter,
 	/* Load mode configuration to Counter Mode Register */
 	outb(QUAD8_CTR_CMR | mode_cfg, base_offset);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -564,9 +572,10 @@ static int quad8_count_enable_write(struct counter_device *counter,
 {
 	struct quad8 *const priv = counter->priv;
 	const int base_offset = priv->base + 2 * count->id;
+	unsigned long irqflags;
 	unsigned int ior_cfg;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	priv->ab_enable[count->id] = enable;
 

@@ -575,7 +584,7 @@ static int quad8_count_enable_write(struct counter_device *counter,
 	/* Load I/O control configuration */
 	outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -626,16 +635,17 @@ static int quad8_count_preset_write(struct counter_device *counter,
 				    struct counter_count *count, u64 preset)
 {
 	struct quad8 *const priv = counter->priv;
+	unsigned long irqflags;
 
 	/* Only 24-bit values are supported */
 	if (preset > 0xFFFFFF)
 		return -ERANGE;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	quad8_preset_register_set(priv, count->id, preset);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -644,8 +654,9 @@ static int quad8_count_ceiling_read(struct counter_device *counter,
 				    struct counter_count *count, u64 *ceiling)
 {
 	struct quad8 *const priv = counter->priv;
+	unsigned long irqflags;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	/* Range Limit and Modulo-N count modes use preset value as ceiling */
 	switch (priv->count_mode[count->id]) {

@@ -659,7 +670,7 @@ static int quad8_count_ceiling_read(struct counter_device *counter,
 		break;
 	}
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -668,23 +679,24 @@ static int quad8_count_ceiling_write(struct counter_device *counter,
 				     struct counter_count *count, u64 ceiling)
 {
 	struct quad8 *const priv = counter->priv;
+	unsigned long irqflags;
 
 	/* Only 24-bit values are supported */
 	if (ceiling > 0xFFFFFF)
 		return -ERANGE;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	/* Range Limit and Modulo-N count modes use preset value as ceiling */
 	switch (priv->count_mode[count->id]) {
 	case 1:
 	case 3:
 		quad8_preset_register_set(priv, count->id, ceiling);
-		mutex_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->lock, irqflags);
 		return 0;
 	}
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return -EINVAL;
 }

@@ -706,12 +718,13 @@ static int quad8_count_preset_enable_write(struct counter_device *counter,
 {
 	struct quad8 *const priv = counter->priv;
 	const int base_offset = priv->base + 2 * count->id + 1;
+	unsigned long irqflags;
 	unsigned int ior_cfg;
 
 	/* Preset enable is active low in Input/Output Control register */
 	preset_enable = !preset_enable;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	priv->preset_enable[count->id] = preset_enable;
 

@@ -720,7 +733,7 @@ static int quad8_count_preset_enable_write(struct counter_device *counter,
 	/* Load I/O control configuration to Input / Output Control Register */
 	outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -731,22 +744,23 @@ static int quad8_signal_cable_fault_read(struct counter_device *counter,
 {
 	struct quad8 *const priv = counter->priv;
 	const size_t channel_id = signal->id / 2;
+	unsigned long irqflags;
 	bool disabled;
 	unsigned int status;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	disabled = !(priv->cable_fault_enable & BIT(channel_id));
 
 	if (disabled) {
-		mutex_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->lock, irqflags);
 		return -EINVAL;
 	}
 
 	/* Logic 0 = cable fault */
 	status = inb(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	/* Mask respective channel and invert logic */
 	*cable_fault = !(status & BIT(channel_id));

@@ -772,9 +786,10 @@ static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
 {
 	struct quad8 *const priv = counter->priv;
 	const size_t channel_id = signal->id / 2;
+	unsigned long irqflags;
 	unsigned int cable_fault_enable;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	if (enable)
 		priv->cable_fault_enable |= BIT(channel_id);

@@ -786,7 +801,7 @@ static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
 
 	outb(cable_fault_enable, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -809,8 +824,9 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
 	struct quad8 *const priv = counter->priv;
 	const size_t channel_id = signal->id / 2;
 	const int base_offset = priv->base + 2 * channel_id;
+	unsigned long irqflags;
 
-	mutex_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, irqflags);
 
 	priv->fck_prescaler[channel_id] = prescaler;
 

@@ -822,7 +838,7 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
 	outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
 	     base_offset + 1);
 
-	mutex_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, irqflags);
 
 	return 0;
 }

@@ -991,8 +1007,7 @@ static int quad8_probe(struct device *dev, unsigned int id)
 	priv->counter.priv = priv;
 	priv->base = base[id];
 
-	/* Initialize mutex */
-	mutex_init(&priv->lock);
+	spin_lock_init(&priv->lock);
 
 	/* Reset all counters and disable interrupt function */
 	outb(QUAD8_CHAN_OP_RESET_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);

index a56751bf1e9b..1cbd60aaed69 100644
@@ -11,6 +11,7 @@
 #include <linux/errno.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
+#include <linux/interrupt.h>
 #include <linux/isa.h>
 #include <linux/kernel.h>
 #include <linux/module.h>

@@ -25,6 +26,10 @@ static unsigned int num_quad8;
 module_param_hw_array(base, uint, ioport, &num_quad8, 0);
 MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
 
+static unsigned int irq[max_num_isa_dev(QUAD8_EXTENT)];
+module_param_hw_array(irq, uint, irq, NULL, 0);
+MODULE_PARM_DESC(irq, "ACCES 104-QUAD-8 interrupt line numbers");
+
 #define QUAD8_NUM_COUNTERS 8
 
 /**

@@ -38,6 +43,8 @@ MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses");
  * @quadrature_scale:	array of quadrature mode scale configurations
  * @ab_enable:		array of A and B inputs enable configurations
  * @preset_enable:	array of set_to_preset_on_index attribute configurations
+ * @irq_trigger:	array of current IRQ trigger function configurations
+ * @next_irq_trigger:	array of next IRQ trigger function configurations
  * @synchronous_mode:	array of index function synchronous mode configurations
  * @index_polarity:	array of index function polarity configurations
  * @cable_fault_enable:	differential encoder cable status enable configurations

@@ -53,13 +60,17 @@ struct quad8 {
 	unsigned int quadrature_scale[QUAD8_NUM_COUNTERS];
 	unsigned int ab_enable[QUAD8_NUM_COUNTERS];
 	unsigned int preset_enable[QUAD8_NUM_COUNTERS];
+	unsigned int irq_trigger[QUAD8_NUM_COUNTERS];
+	unsigned int next_irq_trigger[QUAD8_NUM_COUNTERS];
 	unsigned int synchronous_mode[QUAD8_NUM_COUNTERS];
 	unsigned int index_polarity[QUAD8_NUM_COUNTERS];
 	unsigned int cable_fault_enable;
 	unsigned int base;
 };
 
+#define QUAD8_REG_INTERRUPT_STATUS 0x10
 #define QUAD8_REG_CHAN_OP 0x11
+#define QUAD8_REG_INDEX_INTERRUPT 0x12
 #define QUAD8_REG_INDEX_INPUT_LEVELS 0x16
 #define QUAD8_DIFF_ENCODER_CABLE_STATUS 0x17
 /* Borrow Toggle flip-flop */

@@ -92,8 +103,8 @@ struct quad8 {
 #define QUAD8_RLD_CNTR_OUT 0x10
 /* Transfer Preset Register LSB to FCK Prescaler */
 #define QUAD8_RLD_PRESET_PSC 0x18
-#define QUAD8_CHAN_OP_ENABLE_COUNTERS 0x00
 #define QUAD8_CHAN_OP_RESET_COUNTERS 0x01
+#define QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC 0x04
 #define QUAD8_CMR_QUADRATURE_X1 0x08
 #define QUAD8_CMR_QUADRATURE_X2 0x10
 #define QUAD8_CMR_QUADRATURE_X4 0x18

@@ -378,13 +389,103 @@ static int quad8_action_read(struct counter_device *counter,
 	}
 }
 
+enum {
+	QUAD8_EVENT_NONE = -1,
+	QUAD8_EVENT_CARRY = 0,
+	QUAD8_EVENT_COMPARE = 1,
+	QUAD8_EVENT_CARRY_BORROW = 2,
+	QUAD8_EVENT_INDEX = 3,
+};
+
+static int quad8_events_configure(struct counter_device *counter)
+{
+	struct quad8 *const priv = counter->priv;
+	unsigned long irq_enabled = 0;
+	unsigned long irqflags;
+	size_t channel;
+	unsigned long ior_cfg;
+	unsigned long base_offset;
+
+	spin_lock_irqsave(&priv->lock, irqflags);
+
+	/* Enable interrupts for the requested channels, disable for the rest */
+	for (channel = 0; channel < QUAD8_NUM_COUNTERS; channel++) {
+		if (priv->next_irq_trigger[channel] == QUAD8_EVENT_NONE)
+			continue;
+
+		if (priv->irq_trigger[channel] != priv->next_irq_trigger[channel]) {
+			/* Save new IRQ function configuration */
+			priv->irq_trigger[channel] = priv->next_irq_trigger[channel];
+
+			/* Load configuration to I/O Control Register */
+			ior_cfg = priv->ab_enable[channel] |
+				  priv->preset_enable[channel] << 1 |
+				  priv->irq_trigger[channel] << 3;
+			base_offset = priv->base + 2 * channel + 1;
+			outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
+		}
+
+		/* Reset next IRQ trigger function configuration */
+		priv->next_irq_trigger[channel] = QUAD8_EVENT_NONE;
+
+		/* Enable IRQ line */
+		irq_enabled |= BIT(channel);
+	}
+
+	outb(irq_enabled, priv->base + QUAD8_REG_INDEX_INTERRUPT);
+
+	spin_unlock_irqrestore(&priv->lock, irqflags);
+
+	return 0;
+}
+
+static int quad8_watch_validate(struct counter_device *counter,
+				const struct counter_watch *watch)
+{
+	struct quad8 *const priv = counter->priv;
+
+	if (watch->channel > QUAD8_NUM_COUNTERS - 1)
+		return -EINVAL;
+
+	switch (watch->event) {
+	case COUNTER_EVENT_OVERFLOW:
+		if (priv->next_irq_trigger[watch->channel] == QUAD8_EVENT_NONE)
+			priv->next_irq_trigger[watch->channel] = QUAD8_EVENT_CARRY;
+		else if (priv->next_irq_trigger[watch->channel] != QUAD8_EVENT_CARRY)
+			return -EINVAL;
+		return 0;
+	case COUNTER_EVENT_THRESHOLD:
+		if (priv->next_irq_trigger[watch->channel] == QUAD8_EVENT_NONE)
+			priv->next_irq_trigger[watch->channel] = QUAD8_EVENT_COMPARE;
+		else if (priv->next_irq_trigger[watch->channel] != QUAD8_EVENT_COMPARE)
+			return -EINVAL;
+		return 0;
+	case COUNTER_EVENT_OVERFLOW_UNDERFLOW:
+		if (priv->next_irq_trigger[watch->channel] == QUAD8_EVENT_NONE)
+			priv->next_irq_trigger[watch->channel] = QUAD8_EVENT_CARRY_BORROW;
+		else if (priv->next_irq_trigger[watch->channel] != QUAD8_EVENT_CARRY_BORROW)
+			return -EINVAL;
+		return 0;
+	case COUNTER_EVENT_INDEX:
+		if (priv->next_irq_trigger[watch->channel] == QUAD8_EVENT_NONE)
+			priv->next_irq_trigger[watch->channel] = QUAD8_EVENT_INDEX;
+		else if (priv->next_irq_trigger[watch->channel] != QUAD8_EVENT_INDEX)
+			return -EINVAL;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 static const struct counter_ops quad8_ops = {
 	.signal_read = quad8_signal_read,
 	.count_read = quad8_count_read,
 	.count_write = quad8_count_write,
 	.function_read = quad8_function_read,
 	.function_write = quad8_function_write,
-	.action_read = quad8_action_read
+	.action_read = quad8_action_read,
+	.events_configure = quad8_events_configure,
+	.watch_validate = quad8_watch_validate,
 };
 
 static const char *const quad8_index_polarity_modes[] = {

@@ -579,7 +680,8 @@ static int quad8_count_enable_write(struct counter_device *counter,
 
 	priv->ab_enable[count->id] = enable;
 
-	ior_cfg = enable | priv->preset_enable[count->id] << 1;
+	ior_cfg = enable | priv->preset_enable[count->id] << 1 |
+		  priv->irq_trigger[count->id] << 3;
 
 	/* Load I/O control configuration */
 	outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);

@@ -728,7 +830,8 @@ static int quad8_count_preset_enable_write(struct counter_device *counter,
 
 	priv->preset_enable[count->id] = preset_enable;
 
-	ior_cfg = priv->ab_enable[count->id] | preset_enable << 1;
+	ior_cfg = priv->ab_enable[count->id] | preset_enable << 1 |
+		  priv->irq_trigger[count->id] << 3;
 
 	/* Load I/O control configuration to Input / Output Control Register */
 	outb(QUAD8_CTR_IOR | ior_cfg, base_offset);

@@ -980,11 +1083,54 @@ static struct counter_count quad8_counts[] = {
 	QUAD8_COUNT(7, "Channel 8 Count")
 };
 
+static irqreturn_t quad8_irq_handler(int irq, void *private)
+{
+	struct quad8 *const priv = private;
+	const unsigned long base = priv->base;
+	unsigned long irq_status;
+	unsigned long channel;
+	u8 event;
+
+	irq_status = inb(base + QUAD8_REG_INTERRUPT_STATUS);
+	if (!irq_status)
+		return IRQ_NONE;
+
+	for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS) {
+		switch (priv->irq_trigger[channel]) {
+		case QUAD8_EVENT_CARRY:
+			event = COUNTER_EVENT_OVERFLOW;
+				break;
+		case QUAD8_EVENT_COMPARE:
+			event = COUNTER_EVENT_THRESHOLD;
+				break;
+		case QUAD8_EVENT_CARRY_BORROW:
+			event = COUNTER_EVENT_OVERFLOW_UNDERFLOW;
+				break;
+		case QUAD8_EVENT_INDEX:
+			event = COUNTER_EVENT_INDEX;
+				break;
+		default:
+			/* should never reach this path */
+			WARN_ONCE(true, "invalid interrupt trigger function %u configured for channel %lu\n",
+				  priv->irq_trigger[channel], channel);
+			continue;
+		}
+
+		counter_push_event(&priv->counter, event, channel);
+	}
+
+	/* Clear pending interrupts on device */
+	outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base + QUAD8_REG_CHAN_OP);
+
+	return IRQ_HANDLED;
+}
+
 static int quad8_probe(struct device *dev, unsigned int id)
 {
 	struct quad8 *priv;
 	int i, j;
 	unsigned int base_offset;
+	int err;
 
 	if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) {
 		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",

@@ -1009,6 +1155,8 @@ static int quad8_probe(struct device *dev, unsigned int id)
 
 	spin_lock_init(&priv->lock);
 
+	/* Reset Index/Interrupt Register */
+	outb(0x00, base[id] + QUAD8_REG_INDEX_INTERRUPT);
 	/* Reset all counters and disable interrupt function */
 	outb(QUAD8_CHAN_OP_RESET_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);
 	/* Set initial configuration for all counters */

@@ -1035,11 +1183,18 @@ static int quad8_probe(struct device *dev, unsigned int id)
 		outb(QUAD8_CTR_IOR, base_offset + 1);
 		/* Disable index function; negative index polarity */
 		outb(QUAD8_CTR_IDR, base_offset + 1);
+		/* Initialize next IRQ trigger function configuration */
+		priv->next_irq_trigger[i] = QUAD8_EVENT_NONE;
 	}
 	/* Disable Differential Encoder Cable Status for all channels */
 	outb(0xFF, base[id] + QUAD8_DIFF_ENCODER_CABLE_STATUS);
-	/* Enable all counters */
-	outb(QUAD8_CHAN_OP_ENABLE_COUNTERS, base[id] + QUAD8_REG_CHAN_OP);
+	/* Enable all counters and enable interrupt function */
+	outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base[id] + QUAD8_REG_CHAN_OP);
+
+	err = devm_request_irq(dev, irq[id], quad8_irq_handler, IRQF_SHARED,
+			       priv->counter.name, priv);
+	if (err)
+		return err;
 
 	return devm_counter_register(dev, &priv->counter);
 }