drivers/mfd/wcd9310-irq.c - fp2-dev/kernel/msm - Gitiles

 /* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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/bitops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/irq.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/wcd9310/core.h>
 #include <linux/mfd/wcd9310/registers.h>
 #include <linux/interrupt.h>

 #define BYTE_BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_BYTE))
 #define BIT_BYTE(nr)			((nr) / BITS_PER_BYTE)

 struct tabla_irq {
 	bool level;
 };

 static struct tabla_irq tabla_irqs[TABLA_NUM_IRQS] = {
 	[0] = { .level = 1},
 /* All other tabla interrupts are edge triggered */
 };

 static inline int irq_to_tabla_irq(struct tabla *tabla, int irq)
 {
 	return irq - tabla->irq_base;
 }

 static void tabla_irq_lock(struct irq_data *data)
 {
 	struct tabla *tabla = irq_data_get_irq_chip_data(data);
 	mutex_lock(&tabla->irq_lock);
 }

 static void tabla_irq_sync_unlock(struct irq_data *data)
 {
 	struct tabla *tabla = irq_data_get_irq_chip_data(data);
 	int i;

 	for (i = 0; i < ARRAY_SIZE(tabla->irq_masks_cur); i++) {
 		/* If there's been a change in the mask write it back
 		 * to the hardware.
 		 */
 		if (tabla->irq_masks_cur[i] != tabla->irq_masks_cache[i]) {
 			tabla->irq_masks_cache[i] = tabla->irq_masks_cur[i];
 			tabla_reg_write(tabla, TABLA_A_INTR_MASK0+i,
 				tabla->irq_masks_cur[i]);
 		}
 	}

 	mutex_unlock(&tabla->irq_lock);
 }

 static void tabla_irq_enable(struct irq_data *data)
 {
 	struct tabla *tabla = irq_data_get_irq_chip_data(data);
 	int tabla_irq = irq_to_tabla_irq(tabla, data->irq);
 	tabla->irq_masks_cur[BIT_BYTE(tabla_irq)] &=
 		~(BYTE_BIT_MASK(tabla_irq));
 }

 static void tabla_irq_disable(struct irq_data *data)
 {
 	struct tabla *tabla = irq_data_get_irq_chip_data(data);
 	int tabla_irq = irq_to_tabla_irq(tabla, data->irq);
 	tabla->irq_masks_cur[BIT_BYTE(tabla_irq)] |= BYTE_BIT_MASK(tabla_irq);
 }

 static struct irq_chip tabla_irq_chip = {
 	.name = "tabla",
 	.irq_bus_lock = tabla_irq_lock,
 	.irq_bus_sync_unlock = tabla_irq_sync_unlock,
 	.irq_disable = tabla_irq_disable,
 	.irq_enable = tabla_irq_enable,
 };

 enum tabla_pm_state tabla_pm_cmpxchg(struct tabla *tabla, enum tabla_pm_state o,
 				     enum tabla_pm_state n)
 {
 	enum tabla_pm_state old;
 	mutex_lock(&tabla->pm_lock);
 	old = tabla->pm_state;
 	if (old == o)
 		tabla->pm_state = n;
 	mutex_unlock(&tabla->pm_lock);
 	return old;
 }
 EXPORT_SYMBOL_GPL(tabla_pm_cmpxchg);

 void tabla_lock_sleep(struct tabla *tabla)
 {
 	enum tabla_pm_state os;

 	/* tabla_{lock/unlock}_sleep will be called by tabla_irq_thread
 	 * and its subroutines only motly.
 	 * but btn0_lpress_fn is not tabla_irq_thread's subroutine and
 	 * it can race with tabla_irq_thread.
 	 * so need to embrace wlock_holders with mutex.
 	 */
 	mutex_lock(&tabla->pm_lock);
 	if (tabla->wlock_holders++ == 0)
 		wake_lock(&tabla->wlock);
 	mutex_unlock(&tabla->pm_lock);
 	while (!wait_event_timeout(tabla->pm_wq,
 			((os = tabla_pm_cmpxchg(tabla, TABLA_PM_SLEEPABLE,
 						TABLA_PM_AWAKE)) ==
 						    TABLA_PM_SLEEPABLE ||
 			 (os == TABLA_PM_AWAKE)),
 			5 * HZ)) {
 		pr_err("%s: system didn't resume within 5000ms, state %d, "
 		       "wlock %d\n", __func__, tabla->pm_state,
 		       tabla->wlock_holders);
 		WARN_ON_ONCE(1);
 	}
 	wake_up_all(&tabla->pm_wq);
 }
 EXPORT_SYMBOL_GPL(tabla_lock_sleep);

 void tabla_unlock_sleep(struct tabla *tabla)
 {
 	mutex_lock(&tabla->pm_lock);
 	if (--tabla->wlock_holders == 0) {
 		tabla->pm_state = TABLA_PM_SLEEPABLE;
 		wake_unlock(&tabla->wlock);
 	}
 	mutex_unlock(&tabla->pm_lock);
 	wake_up_all(&tabla->pm_wq);
 }
 EXPORT_SYMBOL_GPL(tabla_unlock_sleep);

 static irqreturn_t tabla_irq_thread(int irq, void *data)
 {
 	int ret;
 	struct tabla *tabla = data;
 	u8 status[TABLA_NUM_IRQ_REGS];
 	unsigned int i;

 	tabla_lock_sleep(tabla);
 	ret = tabla_bulk_read(tabla, TABLA_A_INTR_STATUS0,
 			       TABLA_NUM_IRQ_REGS, status);
 	if (ret < 0) {
 		dev_err(tabla->dev, "Failed to read interrupt status: %d\n",
 			ret);
 		tabla_unlock_sleep(tabla);
 		return IRQ_NONE;
 	}
 	/* Apply masking */
 	for (i = 0; i < TABLA_NUM_IRQ_REGS; i++)
 		status[i] &= ~tabla->irq_masks_cur[i];

 	/* Find out which interrupt was triggered and call that interrupt's
 	 * handler function
 	 */
 	for (i = 0; i < TABLA_NUM_IRQS; i++) {
 		if (status[BIT_BYTE(i)] & BYTE_BIT_MASK(i)) {
 			if ((i <= TABLA_IRQ_MBHC_INSERTION) &&
 				(i >= TABLA_IRQ_MBHC_REMOVAL)) {
 				tabla_reg_write(tabla, TABLA_A_INTR_CLEAR0 +
 					BIT_BYTE(i), BYTE_BIT_MASK(i));
 				if (tabla_get_intf_type() ==
 					TABLA_INTERFACE_TYPE_I2C)
 					tabla_reg_write(tabla,
 						TABLA_A_INTR_MODE, 0x02);
 				handle_nested_irq(tabla->irq_base + i);
 			} else {
 				handle_nested_irq(tabla->irq_base + i);
 				tabla_reg_write(tabla, TABLA_A_INTR_CLEAR0 +
 					BIT_BYTE(i), BYTE_BIT_MASK(i));
 				if (tabla_get_intf_type() ==
 					TABLA_INTERFACE_TYPE_I2C)
 					tabla_reg_write(tabla,
 						TABLA_A_INTR_MODE, 0x02);
 			}
 			break;
 		}
 	}
 	tabla_unlock_sleep(tabla);

 	return IRQ_HANDLED;
 }

 int tabla_irq_init(struct tabla *tabla)
 {
 	int ret;
 	unsigned int i, cur_irq;

 	mutex_init(&tabla->irq_lock);

 	if (!tabla->irq) {
 		dev_warn(tabla->dev,
 			 "No interrupt specified, no interrupts\n");
 		tabla->irq_base = 0;
 		return 0;
 	}

 	if (!tabla->irq_base) {
 		dev_err(tabla->dev,
 			"No interrupt base specified, no interrupts\n");
 		return 0;
 	}
 	/* Mask the individual interrupt sources */
 	for (i = 0, cur_irq = tabla->irq_base; i < TABLA_NUM_IRQS; i++,
 		cur_irq++) {

 		irq_set_chip_data(cur_irq, tabla);

 		if (tabla_irqs[i].level)
 			irq_set_chip_and_handler(cur_irq, &tabla_irq_chip,
 					 handle_level_irq);
 		else
 			irq_set_chip_and_handler(cur_irq, &tabla_irq_chip,
 					 handle_edge_irq);

 		irq_set_nested_thread(cur_irq, 1);

 		/* ARM needs us to explicitly flag the IRQ as valid
 		 * and will set them noprobe when we do so. */
 #ifdef CONFIG_ARM
 		set_irq_flags(cur_irq, IRQF_VALID);
 #else
 		set_irq_noprobe(cur_irq);
 #endif

 		tabla->irq_masks_cur[BIT_BYTE(i)] |= BYTE_BIT_MASK(i);
 		tabla->irq_masks_cache[BIT_BYTE(i)] |= BYTE_BIT_MASK(i);
 		tabla->irq_level[BIT_BYTE(i)] |= tabla_irqs[i].level <<
 			(i % BITS_PER_BYTE);
 	}
 	for (i = 0; i < TABLA_NUM_IRQ_REGS; i++) {
 		/* Initialize interrupt mask and level registers */
 		tabla_reg_write(tabla, TABLA_A_INTR_LEVEL0 + i,
 			tabla->irq_level[i]);
 		tabla_reg_write(tabla, TABLA_A_INTR_MASK0 + i,
 			tabla->irq_masks_cur[i]);
 	}

 	ret = request_threaded_irq(tabla->irq, NULL, tabla_irq_thread,
 				   IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 				   "tabla", tabla);
 	if (ret != 0)
 		dev_err(tabla->dev, "Failed to request IRQ %d: %d\n",
 			tabla->irq, ret);
 	else {
 		ret = enable_irq_wake(tabla->irq);
 		if (ret == 0) {
 			ret = device_init_wakeup(tabla->dev, 1);
 			if (ret) {
 				dev_err(tabla->dev, "Failed to init device"
 					"wakeup : %d\n", ret);
 				disable_irq_wake(tabla->irq);
 			}
 		} else
 			dev_err(tabla->dev, "Failed to set wake interrupt on"
 				" IRQ %d: %d\n", tabla->irq, ret);
 		if (ret)
 			free_irq(tabla->irq, tabla);
 	}

 	if (ret)
 		mutex_destroy(&tabla->irq_lock);

 	return ret;
 }

 void tabla_irq_exit(struct tabla *tabla)
 {
 	if (tabla->irq) {
 		disable_irq_wake(tabla->irq);
 		free_irq(tabla->irq, tabla);
 		device_init_wakeup(tabla->dev, 0);
 	}
 	mutex_destroy(&tabla->irq_lock);
 }
	/* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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/bitops.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/sched.h>
	#include <linux/irq.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/wcd9310/core.h>
	#include <linux/mfd/wcd9310/registers.h>
	#include <linux/interrupt.h>

	#define BYTE_BIT_MASK(nr) (1UL << ((nr) % BITS_PER_BYTE))
	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)

	struct tabla_irq {
	bool level;
	};

	static struct tabla_irq tabla_irqs[TABLA_NUM_IRQS] = {
	[0] = { .level = 1},
	/* All other tabla interrupts are edge triggered */
	};

	static inline int irq_to_tabla_irq(struct tabla *tabla, int irq)
	{
	return irq - tabla->irq_base;
	}

	static void tabla_irq_lock(struct irq_data *data)
	{
	struct tabla *tabla = irq_data_get_irq_chip_data(data);
	mutex_lock(&tabla->irq_lock);
	}

	static void tabla_irq_sync_unlock(struct irq_data *data)
	{
	struct tabla *tabla = irq_data_get_irq_chip_data(data);
	int i;

	for (i = 0; i < ARRAY_SIZE(tabla->irq_masks_cur); i++) {
	/* If there's been a change in the mask write it back
	* to the hardware.
	*/
	if (tabla->irq_masks_cur[i] != tabla->irq_masks_cache[i]) {
	tabla->irq_masks_cache[i] = tabla->irq_masks_cur[i];
	tabla_reg_write(tabla, TABLA_A_INTR_MASK0+i,
	tabla->irq_masks_cur[i]);
	}
	}

	mutex_unlock(&tabla->irq_lock);
	}

	static void tabla_irq_enable(struct irq_data *data)
	{
	struct tabla *tabla = irq_data_get_irq_chip_data(data);
	int tabla_irq = irq_to_tabla_irq(tabla, data->irq);
	tabla->irq_masks_cur[BIT_BYTE(tabla_irq)] &=
	~(BYTE_BIT_MASK(tabla_irq));
	}

	static void tabla_irq_disable(struct irq_data *data)
	{
	struct tabla *tabla = irq_data_get_irq_chip_data(data);
	int tabla_irq = irq_to_tabla_irq(tabla, data->irq);
	tabla->irq_masks_cur[BIT_BYTE(tabla_irq)] \|= BYTE_BIT_MASK(tabla_irq);
	}

	static struct irq_chip tabla_irq_chip = {
	.name = "tabla",
	.irq_bus_lock = tabla_irq_lock,
	.irq_bus_sync_unlock = tabla_irq_sync_unlock,
	.irq_disable = tabla_irq_disable,
	.irq_enable = tabla_irq_enable,
	};

	enum tabla_pm_state tabla_pm_cmpxchg(struct tabla *tabla, enum tabla_pm_state o,
	enum tabla_pm_state n)
	{
	enum tabla_pm_state old;
	mutex_lock(&tabla->pm_lock);
	old = tabla->pm_state;
	if (old == o)
	tabla->pm_state = n;
	mutex_unlock(&tabla->pm_lock);
	return old;
	}
	EXPORT_SYMBOL_GPL(tabla_pm_cmpxchg);

	void tabla_lock_sleep(struct tabla *tabla)
	{
	enum tabla_pm_state os;

	/* tabla_{lock/unlock}_sleep will be called by tabla_irq_thread
	* and its subroutines only motly.
	* but btn0_lpress_fn is not tabla_irq_thread's subroutine and
	* it can race with tabla_irq_thread.
	* so need to embrace wlock_holders with mutex.
	*/
	mutex_lock(&tabla->pm_lock);
	if (tabla->wlock_holders++ == 0)
	wake_lock(&tabla->wlock);
	mutex_unlock(&tabla->pm_lock);
	while (!wait_event_timeout(tabla->pm_wq,
	((os = tabla_pm_cmpxchg(tabla, TABLA_PM_SLEEPABLE,
	TABLA_PM_AWAKE)) ==
	TABLA_PM_SLEEPABLE \|\|
	(os == TABLA_PM_AWAKE)),
	5 * HZ)) {
	pr_err("%s: system didn't resume within 5000ms, state %d, "
	"wlock %d\n", __func__, tabla->pm_state,
	tabla->wlock_holders);
	WARN_ON_ONCE(1);
	}
	wake_up_all(&tabla->pm_wq);
	}
	EXPORT_SYMBOL_GPL(tabla_lock_sleep);

	void tabla_unlock_sleep(struct tabla *tabla)
	{
	mutex_lock(&tabla->pm_lock);
	if (--tabla->wlock_holders == 0) {
	tabla->pm_state = TABLA_PM_SLEEPABLE;
	wake_unlock(&tabla->wlock);
	}
	mutex_unlock(&tabla->pm_lock);
	wake_up_all(&tabla->pm_wq);
	}
	EXPORT_SYMBOL_GPL(tabla_unlock_sleep);

	static irqreturn_t tabla_irq_thread(int irq, void *data)
	{
	int ret;
	struct tabla *tabla = data;
	u8 status[TABLA_NUM_IRQ_REGS];
	unsigned int i;

	tabla_lock_sleep(tabla);
	ret = tabla_bulk_read(tabla, TABLA_A_INTR_STATUS0,
	TABLA_NUM_IRQ_REGS, status);
	if (ret < 0) {
	dev_err(tabla->dev, "Failed to read interrupt status: %d\n",
	ret);
	tabla_unlock_sleep(tabla);
	return IRQ_NONE;
	}
	/* Apply masking */
	for (i = 0; i < TABLA_NUM_IRQ_REGS; i++)
	status[i] &= ~tabla->irq_masks_cur[i];

	/* Find out which interrupt was triggered and call that interrupt's
	* handler function
	*/
	for (i = 0; i < TABLA_NUM_IRQS; i++) {
	if (status[BIT_BYTE(i)] & BYTE_BIT_MASK(i)) {
	if ((i <= TABLA_IRQ_MBHC_INSERTION) &&
	(i >= TABLA_IRQ_MBHC_REMOVAL)) {
	tabla_reg_write(tabla, TABLA_A_INTR_CLEAR0 +
	BIT_BYTE(i), BYTE_BIT_MASK(i));
	if (tabla_get_intf_type() ==
	TABLA_INTERFACE_TYPE_I2C)
	tabla_reg_write(tabla,
	TABLA_A_INTR_MODE, 0x02);
	handle_nested_irq(tabla->irq_base + i);
	} else {
	handle_nested_irq(tabla->irq_base + i);
	tabla_reg_write(tabla, TABLA_A_INTR_CLEAR0 +
	BIT_BYTE(i), BYTE_BIT_MASK(i));
	if (tabla_get_intf_type() ==
	TABLA_INTERFACE_TYPE_I2C)
	tabla_reg_write(tabla,
	TABLA_A_INTR_MODE, 0x02);
	}
	break;
	}
	}
	tabla_unlock_sleep(tabla);

	return IRQ_HANDLED;
	}

	int tabla_irq_init(struct tabla *tabla)
	{
	int ret;
	unsigned int i, cur_irq;

	mutex_init(&tabla->irq_lock);

	if (!tabla->irq) {
	dev_warn(tabla->dev,
	"No interrupt specified, no interrupts\n");
	tabla->irq_base = 0;
	return 0;
	}

	if (!tabla->irq_base) {
	dev_err(tabla->dev,
	"No interrupt base specified, no interrupts\n");
	return 0;
	}
	/* Mask the individual interrupt sources */
	for (i = 0, cur_irq = tabla->irq_base; i < TABLA_NUM_IRQS; i++,
	cur_irq++) {

	irq_set_chip_data(cur_irq, tabla);

	if (tabla_irqs[i].level)
	irq_set_chip_and_handler(cur_irq, &tabla_irq_chip,
	handle_level_irq);
	else
	irq_set_chip_and_handler(cur_irq, &tabla_irq_chip,
	handle_edge_irq);

	irq_set_nested_thread(cur_irq, 1);

	/* ARM needs us to explicitly flag the IRQ as valid
	* and will set them noprobe when we do so. */
	#ifdef CONFIG_ARM
	set_irq_flags(cur_irq, IRQF_VALID);
	#else
	set_irq_noprobe(cur_irq);
	#endif

	tabla->irq_masks_cur[BIT_BYTE(i)] \|= BYTE_BIT_MASK(i);
	tabla->irq_masks_cache[BIT_BYTE(i)] \|= BYTE_BIT_MASK(i);
	tabla->irq_level[BIT_BYTE(i)] \|= tabla_irqs[i].level <<
	(i % BITS_PER_BYTE);
	}
	for (i = 0; i < TABLA_NUM_IRQ_REGS; i++) {
	/* Initialize interrupt mask and level registers */
	tabla_reg_write(tabla, TABLA_A_INTR_LEVEL0 + i,
	tabla->irq_level[i]);
	tabla_reg_write(tabla, TABLA_A_INTR_MASK0 + i,
	tabla->irq_masks_cur[i]);
	}

	ret = request_threaded_irq(tabla->irq, NULL, tabla_irq_thread,
	IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
	"tabla", tabla);
	if (ret != 0)
	dev_err(tabla->dev, "Failed to request IRQ %d: %d\n",
	tabla->irq, ret);
	else {
	ret = enable_irq_wake(tabla->irq);
	if (ret == 0) {
	ret = device_init_wakeup(tabla->dev, 1);
	if (ret) {
	dev_err(tabla->dev, "Failed to init device"
	"wakeup : %d\n", ret);
	disable_irq_wake(tabla->irq);
	}
	} else
	dev_err(tabla->dev, "Failed to set wake interrupt on"
	" IRQ %d: %d\n", tabla->irq, ret);
	if (ret)
	free_irq(tabla->irq, tabla);
	}

	if (ret)
	mutex_destroy(&tabla->irq_lock);

	return ret;
	}

	void tabla_irq_exit(struct tabla *tabla)
	{
	if (tabla->irq) {
	disable_irq_wake(tabla->irq);
	free_irq(tabla->irq, tabla);
	device_init_wakeup(tabla->dev, 0);
	}
	mutex_destroy(&tabla->irq_lock);
	}