drivers/mfd/pcf50633-irq.c - kernel/skids - Git at Google

 /* NXP PCF50633 Power Management Unit (PMU) driver
  *
  * (C) 2006-2008 by Openmoko, Inc.
  * Author: Harald Welte <laforge@openmoko.org>
  * 	   Balaji Rao <balajirrao@openmoko.org>
  * 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 as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>

 #include <linux/mfd/pcf50633/core.h>

 /* Two MBCS registers used during cold start */
 #define PCF50633_REG_MBCS1		0x4b
 #define PCF50633_REG_MBCS2		0x4c
 #define PCF50633_MBCS1_USBPRES 		0x01
 #define PCF50633_MBCS1_ADAPTPRES	0x01

 int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
 			void (*handler) (int, void *), void *data)
 {
 	if (irq < 0 || irq >= PCF50633_NUM_IRQ || !handler)
 		return -EINVAL;

 	if (WARN_ON(pcf->irq_handler[irq].handler))
 		return -EBUSY;

 	mutex_lock(&pcf->lock);
 	pcf->irq_handler[irq].handler = handler;
 	pcf->irq_handler[irq].data = data;
 	mutex_unlock(&pcf->lock);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(pcf50633_register_irq);

 int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
 {
 	if (irq < 0 || irq >= PCF50633_NUM_IRQ)
 		return -EINVAL;

 	mutex_lock(&pcf->lock);
 	pcf->irq_handler[irq].handler = NULL;
 	mutex_unlock(&pcf->lock);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(pcf50633_free_irq);

 static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
 {
 	u8 reg, bit;
 	int ret = 0, idx;

 	idx = irq >> 3;
 	reg = PCF50633_REG_INT1M + idx;
 	bit = 1 << (irq & 0x07);

 	pcf50633_reg_set_bit_mask(pcf, reg, bit, mask ? bit : 0);

 	mutex_lock(&pcf->lock);

 	if (mask)
 		pcf->mask_regs[idx] |= bit;
 	else
 		pcf->mask_regs[idx] &= ~bit;

 	mutex_unlock(&pcf->lock);

 	return ret;
 }

 int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
 {
 	dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);

 	return __pcf50633_irq_mask_set(pcf, irq, 1);
 }
 EXPORT_SYMBOL_GPL(pcf50633_irq_mask);

 int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
 {
 	dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);

 	return __pcf50633_irq_mask_set(pcf, irq, 0);
 }
 EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);

 int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
 {
 	u8 reg, bits;

 	reg =  irq >> 3;
 	bits = 1 << (irq & 0x07);

 	return pcf->mask_regs[reg] & bits;
 }
 EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);

 static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
 {
 	if (pcf->irq_handler[irq].handler)
 		pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
 }

 /* Maximum amount of time ONKEY is held before emergency action is taken */
 #define PCF50633_ONKEY1S_TIMEOUT 8

 static irqreturn_t pcf50633_irq(int irq, void *data)
 {
 	struct pcf50633 *pcf = data;
 	int ret, i, j;
 	u8 pcf_int[5], chgstat;

 	/* Read the 5 INT regs in one transaction */
 	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
 						ARRAY_SIZE(pcf_int), pcf_int);
 	if (ret != ARRAY_SIZE(pcf_int)) {
 		dev_err(pcf->dev, "Error reading INT registers\n");

 		/*
 		 * If this doesn't ACK the interrupt to the chip, we'll be
 		 * called once again as we're level triggered.
 		 */
 		goto out;
 	}

 	/* defeat 8s death from lowsys on A5 */
 	pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN,  0x04);

 	/* We immediately read the usb and adapter status. We thus make sure
 	 * only of USBINS/USBREM IRQ handlers are called */
 	if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
 		chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
 		if (chgstat & (0x3 << 4))
 			pcf_int[0] &= ~PCF50633_INT1_USBREM;
 		else
 			pcf_int[0] &= ~PCF50633_INT1_USBINS;
 	}

 	/* Make sure only one of ADPINS or ADPREM is set */
 	if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
 		chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
 		if (chgstat & (0x3 << 4))
 			pcf_int[0] &= ~PCF50633_INT1_ADPREM;
 		else
 			pcf_int[0] &= ~PCF50633_INT1_ADPINS;
 	}

 	dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
 			"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
 			pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);

 	/* Some revisions of the chip don't have a 8s standby mode on
 	 * ONKEY1S press. We try to manually do it in such cases. */
 	if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
 		dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
 							pcf->onkey1s_held);
 		if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
 			if (pcf->pdata->force_shutdown)
 				pcf->pdata->force_shutdown(pcf);
 	}

 	if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
 		dev_info(pcf->dev, "ONKEY1S held\n");
 		pcf->onkey1s_held = 1 ;

 		/* Unmask IRQ_SECOND */
 		pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
 						PCF50633_INT1_SECOND);

 		/* Unmask IRQ_ONKEYR */
 		pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
 						PCF50633_INT2_ONKEYR);
 	}

 	if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
 		pcf->onkey1s_held = 0;

 		/* Mask SECOND and ONKEYR interrupts */
 		if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
 			pcf50633_reg_set_bit_mask(pcf,
 					PCF50633_REG_INT1M,
 					PCF50633_INT1_SECOND,
 					PCF50633_INT1_SECOND);

 		if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
 			pcf50633_reg_set_bit_mask(pcf,
 					PCF50633_REG_INT2M,
 					PCF50633_INT2_ONKEYR,
 					PCF50633_INT2_ONKEYR);
 	}

 	/* Have we just resumed ? */
 	if (pcf->is_suspended) {
 		pcf->is_suspended = 0;

 		/* Set the resume reason filtering out non resumers */
 		for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
 			pcf->resume_reason[i] = pcf_int[i] &
 						pcf->pdata->resumers[i];

 		/* Make sure we don't pass on any ONKEY events to
 		 * userspace now */
 		pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
 	}

 	for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
 		/* Unset masked interrupts */
 		pcf_int[i] &= ~pcf->mask_regs[i];

 		for (j = 0; j < 8 ; j++)
 			if (pcf_int[i] & (1 << j))
 				pcf50633_irq_call_handler(pcf, (i * 8) + j);
 	}

 out:
 	return IRQ_HANDLED;
 }

 #ifdef CONFIG_PM

 int pcf50633_irq_suspend(struct pcf50633 *pcf)
 {
 	int ret;
 	int i;
 	u8 res[5];


 	/* Make sure our interrupt handlers are not called
 	 * henceforth */
 	disable_irq(pcf->irq);

 	/* Save the masks */
 	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
 				ARRAY_SIZE(pcf->suspend_irq_masks),
 					pcf->suspend_irq_masks);
 	if (ret < 0) {
 		dev_err(pcf->dev, "error saving irq masks\n");
 		goto out;
 	}

 	/* Write wakeup irq masks */
 	for (i = 0; i < ARRAY_SIZE(res); i++)
 		res[i] = ~pcf->pdata->resumers[i];

 	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
 					ARRAY_SIZE(res), &res[0]);
 	if (ret < 0) {
 		dev_err(pcf->dev, "error writing wakeup irq masks\n");
 		goto out;
 	}

 	pcf->is_suspended = 1;

 out:
 	return ret;
 }

 int pcf50633_irq_resume(struct pcf50633 *pcf)
 {
 	int ret;

 	/* Write the saved mask registers */
 	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
 				ARRAY_SIZE(pcf->suspend_irq_masks),
 					pcf->suspend_irq_masks);
 	if (ret < 0)
 		dev_err(pcf->dev, "Error restoring saved suspend masks\n");

 	enable_irq(pcf->irq);

 	return ret;
 }

 #endif

 int pcf50633_irq_init(struct pcf50633 *pcf, int irq)
 {
 	int ret;

 	pcf->irq = irq;

 	/* Enable all interrupts except RTC SECOND */
 	pcf->mask_regs[0] = 0x80;
 	pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);

 	ret = request_threaded_irq(irq, NULL, pcf50633_irq,
 					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 					"pcf50633", pcf);

 	if (ret)
 		dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);

 	if (enable_irq_wake(irq) < 0)
 		dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
 			"in this hardware revision", irq);

 	return ret;
 }

 void pcf50633_irq_free(struct pcf50633 *pcf)
 {
 	free_irq(pcf->irq, pcf);
 }
	/* NXP PCF50633 Power Management Unit (PMU) driver
	*
	* (C) 2006-2008 by Openmoko, Inc.
	* Author: Harald Welte <laforge@openmoko.org>
	* Balaji Rao <balajirrao@openmoko.org>
	* 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 as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/mutex.h>
	#include <linux/slab.h>

	#include <linux/mfd/pcf50633/core.h>

	/* Two MBCS registers used during cold start */
	#define PCF50633_REG_MBCS1 0x4b
	#define PCF50633_REG_MBCS2 0x4c
	#define PCF50633_MBCS1_USBPRES 0x01
	#define PCF50633_MBCS1_ADAPTPRES 0x01

	int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
	void (handler) (int, void ), void *data)
	{
	if (irq < 0 \|\| irq >= PCF50633_NUM_IRQ \|\| !handler)
	return -EINVAL;

	if (WARN_ON(pcf->irq_handler[irq].handler))
	return -EBUSY;

	mutex_lock(&pcf->lock);
	pcf->irq_handler[irq].handler = handler;
	pcf->irq_handler[irq].data = data;
	mutex_unlock(&pcf->lock);

	return 0;
	}
	EXPORT_SYMBOL_GPL(pcf50633_register_irq);

	int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
	{
	if (irq < 0 \|\| irq >= PCF50633_NUM_IRQ)
	return -EINVAL;

	mutex_lock(&pcf->lock);
	pcf->irq_handler[irq].handler = NULL;
	mutex_unlock(&pcf->lock);

	return 0;
	}
	EXPORT_SYMBOL_GPL(pcf50633_free_irq);

	static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
	{
	u8 reg, bit;
	int ret = 0, idx;

	idx = irq >> 3;
	reg = PCF50633_REG_INT1M + idx;
	bit = 1 << (irq & 0x07);

	pcf50633_reg_set_bit_mask(pcf, reg, bit, mask ? bit : 0);

	mutex_lock(&pcf->lock);

	if (mask)
	pcf->mask_regs[idx] \|= bit;
	else
	pcf->mask_regs[idx] &= ~bit;

	mutex_unlock(&pcf->lock);

	return ret;
	}

	int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
	{
	dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);

	return __pcf50633_irq_mask_set(pcf, irq, 1);
	}
	EXPORT_SYMBOL_GPL(pcf50633_irq_mask);

	int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
	{
	dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);

	return __pcf50633_irq_mask_set(pcf, irq, 0);
	}
	EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);

	int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
	{
	u8 reg, bits;

	reg = irq >> 3;
	bits = 1 << (irq & 0x07);

	return pcf->mask_regs[reg] & bits;
	}
	EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);

	static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
	{
	if (pcf->irq_handler[irq].handler)
	pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
	}

	/* Maximum amount of time ONKEY is held before emergency action is taken */
	#define PCF50633_ONKEY1S_TIMEOUT 8

	static irqreturn_t pcf50633_irq(int irq, void *data)
	{
	struct pcf50633 *pcf = data;
	int ret, i, j;
	u8 pcf_int[5], chgstat;

	/* Read the 5 INT regs in one transaction */
	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
	ARRAY_SIZE(pcf_int), pcf_int);
	if (ret != ARRAY_SIZE(pcf_int)) {
	dev_err(pcf->dev, "Error reading INT registers\n");

	/*
	* If this doesn't ACK the interrupt to the chip, we'll be
	* called once again as we're level triggered.
	*/
	goto out;
	}

	/* defeat 8s death from lowsys on A5 */
	pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN, 0x04);

	/* We immediately read the usb and adapter status. We thus make sure
	* only of USBINS/USBREM IRQ handlers are called */
	if (pcf_int[0] & (PCF50633_INT1_USBINS \| PCF50633_INT1_USBREM)) {
	chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
	if (chgstat & (0x3 << 4))
	pcf_int[0] &= ~PCF50633_INT1_USBREM;
	else
	pcf_int[0] &= ~PCF50633_INT1_USBINS;
	}

	/* Make sure only one of ADPINS or ADPREM is set */
	if (pcf_int[0] & (PCF50633_INT1_ADPINS \| PCF50633_INT1_ADPREM)) {
	chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
	if (chgstat & (0x3 << 4))
	pcf_int[0] &= ~PCF50633_INT1_ADPREM;
	else
	pcf_int[0] &= ~PCF50633_INT1_ADPINS;
	}

	dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
	"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
	pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);

	/* Some revisions of the chip don't have a 8s standby mode on
	* ONKEY1S press. We try to manually do it in such cases. */
	if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
	dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
	pcf->onkey1s_held);
	if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
	if (pcf->pdata->force_shutdown)
	pcf->pdata->force_shutdown(pcf);
	}

	if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
	dev_info(pcf->dev, "ONKEY1S held\n");
	pcf->onkey1s_held = 1 ;

	/* Unmask IRQ_SECOND */
	pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
	PCF50633_INT1_SECOND);

	/* Unmask IRQ_ONKEYR */
	pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
	PCF50633_INT2_ONKEYR);
	}

	if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
	pcf->onkey1s_held = 0;

	/* Mask SECOND and ONKEYR interrupts */
	if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
	pcf50633_reg_set_bit_mask(pcf,
	PCF50633_REG_INT1M,
	PCF50633_INT1_SECOND,
	PCF50633_INT1_SECOND);

	if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
	pcf50633_reg_set_bit_mask(pcf,
	PCF50633_REG_INT2M,
	PCF50633_INT2_ONKEYR,
	PCF50633_INT2_ONKEYR);
	}

	/* Have we just resumed ? */
	if (pcf->is_suspended) {
	pcf->is_suspended = 0;

	/* Set the resume reason filtering out non resumers */
	for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
	pcf->resume_reason[i] = pcf_int[i] &
	pcf->pdata->resumers[i];

	/* Make sure we don't pass on any ONKEY events to
	* userspace now */
	pcf_int[1] &= ~(PCF50633_INT2_ONKEYR \| PCF50633_INT2_ONKEYF);
	}

	for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
	/* Unset masked interrupts */
	pcf_int[i] &= ~pcf->mask_regs[i];

	for (j = 0; j < 8 ; j++)
	if (pcf_int[i] & (1 << j))
	pcf50633_irq_call_handler(pcf, (i * 8) + j);
	}

	out:
	return IRQ_HANDLED;
	}

	#ifdef CONFIG_PM

	int pcf50633_irq_suspend(struct pcf50633 *pcf)
	{
	int ret;
	int i;
	u8 res[5];


	/* Make sure our interrupt handlers are not called
	* henceforth */
	disable_irq(pcf->irq);

	/* Save the masks */
	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
	ARRAY_SIZE(pcf->suspend_irq_masks),
	pcf->suspend_irq_masks);
	if (ret < 0) {
	dev_err(pcf->dev, "error saving irq masks\n");
	goto out;
	}

	/* Write wakeup irq masks */
	for (i = 0; i < ARRAY_SIZE(res); i++)
	res[i] = ~pcf->pdata->resumers[i];

	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
	ARRAY_SIZE(res), &res[0]);
	if (ret < 0) {
	dev_err(pcf->dev, "error writing wakeup irq masks\n");
	goto out;
	}

	pcf->is_suspended = 1;

	out:
	return ret;
	}

	int pcf50633_irq_resume(struct pcf50633 *pcf)
	{
	int ret;

	/* Write the saved mask registers */
	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
	ARRAY_SIZE(pcf->suspend_irq_masks),
	pcf->suspend_irq_masks);
	if (ret < 0)
	dev_err(pcf->dev, "Error restoring saved suspend masks\n");

	enable_irq(pcf->irq);

	return ret;
	}

	#endif

	int pcf50633_irq_init(struct pcf50633 *pcf, int irq)
	{
	int ret;

	pcf->irq = irq;

	/* Enable all interrupts except RTC SECOND */
	pcf->mask_regs[0] = 0x80;
	pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
	pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
	pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
	pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
	pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);

	ret = request_threaded_irq(irq, NULL, pcf50633_irq,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"pcf50633", pcf);

	if (ret)
	dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);

	if (enable_irq_wake(irq) < 0)
	dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
	"in this hardware revision", irq);

	return ret;
	}

	void pcf50633_irq_free(struct pcf50633 *pcf)
	{
	free_irq(pcf->irq, pcf);
	}