drivers/mfd/max8925-core.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Base driver for Maxim MAX8925
  *
  * Copyright (C) 2009 Marvell International Ltd.
  *	Haojian Zhuang <haojian.zhuang@marvell.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max8925.h>

 #define IRQ_MODE_STATUS		0
 #define IRQ_MODE_MASK		1

 static int __get_irq_offset(struct max8925_chip *chip, int irq, int mode,
 			    int *offset, int *bit)
 {
 	if (!offset || !bit)
 		return -EINVAL;

 	switch (chip->chip_id) {
 	case MAX8925_GPM:
 		*bit = irq % BITS_PER_BYTE;
 		if (irq < (BITS_PER_BYTE << 1)) {	/* irq = [0,15] */
 			*offset = (mode) ? MAX8925_CHG_IRQ1_MASK
 				: MAX8925_CHG_IRQ1;
 			if (irq >= BITS_PER_BYTE)
 				(*offset)++;
 		} else {				/* irq = [16,31] */
 			*offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK
 				: MAX8925_ON_OFF_IRQ1;
 			if (irq >= (BITS_PER_BYTE * 3))
 				(*offset)++;
 		}
 		break;
 	case MAX8925_ADC:
 		*bit = irq % BITS_PER_BYTE;
 		*offset = (mode) ? MAX8925_TSC_IRQ_MASK : MAX8925_TSC_IRQ;
 		break;
 	default:
 		goto out;
 	}
 	return 0;
 out:
 	dev_err(chip->dev, "Wrong irq #%d is assigned\n", irq);
 	return -EINVAL;
 }

 static int __check_irq(int irq)
 {
 	if ((irq < 0) || (irq >= MAX8925_NUM_IRQ))
 		return -EINVAL;
 	return 0;
 }

 int max8925_mask_irq(struct max8925_chip *chip, int irq)
 {
 	int offset, bit, ret;

 	ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
 	if (ret < 0)
 		return ret;
 	ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 1 << bit);
 	return ret;
 }

 int max8925_unmask_irq(struct max8925_chip *chip, int irq)
 {
 	int offset, bit, ret;

 	ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
 	if (ret < 0)
 		return ret;
 	ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 0);
 	return ret;
 }

 #define INT_STATUS_NUM		(MAX8925_NUM_IRQ / BITS_PER_BYTE)

 static irqreturn_t max8925_irq_thread(int irq, void *data)
 {
 	struct max8925_chip *chip = data;
 	unsigned long irq_status[INT_STATUS_NUM];
 	unsigned char status_buf[INT_STATUS_NUM << 1];
 	int i, ret;

 	memset(irq_status, 0, sizeof(unsigned long) * INT_STATUS_NUM);

 	/* all these interrupt status registers are read-only */
 	switch (chip->chip_id) {
 	case MAX8925_GPM:
 		ret = max8925_bulk_read(chip->i2c, MAX8925_CHG_IRQ1,
 					4, status_buf);
 		if (ret < 0)
 			goto out;
 		ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ1,
 					2, &status_buf[4]);
 		if (ret < 0)
 			goto out;
 		ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ2,
 					2, &status_buf[6]);
 		if (ret < 0)
 			goto out;
 		/* clear masked interrupt status */
 		status_buf[0] &= (~status_buf[2] & CHG_IRQ1_MASK);
 		irq_status[0] |= status_buf[0];
 		status_buf[1] &= (~status_buf[3] & CHG_IRQ2_MASK);
 		irq_status[0] |= (status_buf[1] << BITS_PER_BYTE);
 		status_buf[4] &= (~status_buf[5] & ON_OFF_IRQ1_MASK);
 		irq_status[0] |= (status_buf[4] << (BITS_PER_BYTE * 2));
 		status_buf[6] &= (~status_buf[7] & ON_OFF_IRQ2_MASK);
 		irq_status[0] |= (status_buf[6] << (BITS_PER_BYTE * 3));
 		break;
 	case MAX8925_ADC:
 		ret = max8925_bulk_read(chip->i2c, MAX8925_TSC_IRQ,
 					2, status_buf);
 		if (ret < 0)
 			goto out;
 		/* clear masked interrupt status */
 		status_buf[0] &= (~status_buf[1] & TSC_IRQ_MASK);
 		irq_status[0] |= status_buf[0];
 		break;
 	default:
 		goto out;
 	}

 	for_each_bit(i, &irq_status[0], MAX8925_NUM_IRQ) {
 		clear_bit(i, irq_status);
 		dev_dbg(chip->dev, "Servicing IRQ #%d in %s\n", i, chip->name);

 		mutex_lock(&chip->irq_lock);
 		if (chip->irq[i].handler)
 			chip->irq[i].handler(i, chip->irq[i].data);
 		else {
 			max8925_mask_irq(chip, i);
 			dev_err(chip->dev, "Noboday cares IRQ #%d in %s. "
 				"Now mask it.\n", i, chip->name);
 		}
 		mutex_unlock(&chip->irq_lock);
 	}
 out:
 	return IRQ_HANDLED;
 }

 int max8925_request_irq(struct max8925_chip *chip, int irq,
 			irq_handler_t handler, void *data)
 {
 	if ((__check_irq(irq) < 0) || !handler)
 		return -EINVAL;

 	mutex_lock(&chip->irq_lock);
 	chip->irq[irq].handler = handler;
 	chip->irq[irq].data = data;
 	mutex_unlock(&chip->irq_lock);
 	return 0;
 }
 EXPORT_SYMBOL(max8925_request_irq);

 int max8925_free_irq(struct max8925_chip *chip, int irq)
 {
 	if (__check_irq(irq) < 0)
 		return -EINVAL;

 	mutex_lock(&chip->irq_lock);
 	chip->irq[irq].handler = NULL;
 	chip->irq[irq].data = NULL;
 	mutex_unlock(&chip->irq_lock);
 	return 0;
 }
 EXPORT_SYMBOL(max8925_free_irq);

 static int __devinit device_gpm_init(struct max8925_chip *chip,
 				      struct i2c_client *i2c,
 				      struct max8925_platform_data *pdata)
 {
 	int ret;

 	/* mask all IRQs */
 	ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ1_MASK, 0x7, 0x7);
 	if (ret < 0)
 		goto out;
 	ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ2_MASK, 0xff, 0xff);
 	if (ret < 0)
 		goto out;
 	ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff, 0xff);
 	if (ret < 0)
 		goto out;
 	ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ2_MASK, 0x3, 0x3);
 	if (ret < 0)
 		goto out;

 	chip->name = "GPM";
 	memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
 	ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
 				IRQF_ONESHOT | IRQF_TRIGGER_LOW,
 				"max8925-gpm", chip);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
 		goto out;
 	}
 	chip->chip_irq = i2c->irq;

 	/* enable hard-reset for ONKEY power-off */
 	max8925_set_bits(i2c, MAX8925_SYSENSEL, 0x80, 0x80);
 out:
 	return ret;
 }

 static int __devinit device_adc_init(struct max8925_chip *chip,
 				     struct i2c_client *i2c,
 				     struct max8925_platform_data *pdata)
 {
 	int ret;

 	/* mask all IRQs */
 	ret = max8925_set_bits(i2c, MAX8925_TSC_IRQ_MASK, 3, 3);

 	chip->name = "ADC";
 	memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
 	ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
 				IRQF_ONESHOT | IRQF_TRIGGER_LOW,
 				"max8925-adc", chip);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
 		goto out;
 	}
 	chip->chip_irq = i2c->irq;
 out:
 	return ret;
 }

 int __devinit max8925_device_init(struct max8925_chip *chip,
 				  struct max8925_platform_data *pdata)
 {
 	switch (chip->chip_id) {
 	case MAX8925_GPM:
 		device_gpm_init(chip, chip->i2c, pdata);
 		break;
 	case MAX8925_ADC:
 		device_adc_init(chip, chip->i2c, pdata);
 		break;
 	}
 	return 0;
 }

 void max8925_device_exit(struct max8925_chip *chip)
 {
 	if (chip->chip_irq >= 0)
 		free_irq(chip->chip_irq, chip);
 }

 MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
 MODULE_LICENSE("GPL");
	/*
	* Base driver for Maxim MAX8925
	*
	* Copyright (C) 2009 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/max8925.h>

	#define IRQ_MODE_STATUS 0
	#define IRQ_MODE_MASK 1

	static int __get_irq_offset(struct max8925_chip *chip, int irq, int mode,
	int offset, int bit)
	{
	if (!offset \|\| !bit)
	return -EINVAL;

	switch (chip->chip_id) {
	case MAX8925_GPM:
	*bit = irq % BITS_PER_BYTE;
	if (irq < (BITS_PER_BYTE << 1)) { /* irq = [0,15] */
	*offset = (mode) ? MAX8925_CHG_IRQ1_MASK
	: MAX8925_CHG_IRQ1;
	if (irq >= BITS_PER_BYTE)
	(*offset)++;
	} else { /* irq = [16,31] */
	*offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK
	: MAX8925_ON_OFF_IRQ1;
	if (irq >= (BITS_PER_BYTE * 3))
	(*offset)++;
	}
	break;
	case MAX8925_ADC:
	*bit = irq % BITS_PER_BYTE;
	*offset = (mode) ? MAX8925_TSC_IRQ_MASK : MAX8925_TSC_IRQ;
	break;
	default:
	goto out;
	}
	return 0;
	out:
	dev_err(chip->dev, "Wrong irq #%d is assigned\n", irq);
	return -EINVAL;
	}

	static int __check_irq(int irq)
	{
	if ((irq < 0) \|\| (irq >= MAX8925_NUM_IRQ))
	return -EINVAL;
	return 0;
	}

	int max8925_mask_irq(struct max8925_chip *chip, int irq)
	{
	int offset, bit, ret;

	ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
	if (ret < 0)
	return ret;
	ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 1 << bit);
	return ret;
	}

	int max8925_unmask_irq(struct max8925_chip *chip, int irq)
	{
	int offset, bit, ret;

	ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
	if (ret < 0)
	return ret;
	ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 0);
	return ret;
	}

	#define INT_STATUS_NUM (MAX8925_NUM_IRQ / BITS_PER_BYTE)

	static irqreturn_t max8925_irq_thread(int irq, void *data)
	{
	struct max8925_chip *chip = data;
	unsigned long irq_status[INT_STATUS_NUM];
	unsigned char status_buf[INT_STATUS_NUM << 1];
	int i, ret;

	memset(irq_status, 0, sizeof(unsigned long) * INT_STATUS_NUM);

	/* all these interrupt status registers are read-only */
	switch (chip->chip_id) {
	case MAX8925_GPM:
	ret = max8925_bulk_read(chip->i2c, MAX8925_CHG_IRQ1,
	4, status_buf);
	if (ret < 0)
	goto out;
	ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ1,
	2, &status_buf[4]);
	if (ret < 0)
	goto out;
	ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ2,
	2, &status_buf[6]);
	if (ret < 0)
	goto out;
	/* clear masked interrupt status */
	status_buf[0] &= (~status_buf[2] & CHG_IRQ1_MASK);
	irq_status[0] \|= status_buf[0];
	status_buf[1] &= (~status_buf[3] & CHG_IRQ2_MASK);
	irq_status[0] \|= (status_buf[1] << BITS_PER_BYTE);
	status_buf[4] &= (~status_buf[5] & ON_OFF_IRQ1_MASK);
	irq_status[0] \|= (status_buf[4] << (BITS_PER_BYTE * 2));
	status_buf[6] &= (~status_buf[7] & ON_OFF_IRQ2_MASK);
	irq_status[0] \|= (status_buf[6] << (BITS_PER_BYTE * 3));
	break;
	case MAX8925_ADC:
	ret = max8925_bulk_read(chip->i2c, MAX8925_TSC_IRQ,
	2, status_buf);
	if (ret < 0)
	goto out;
	/* clear masked interrupt status */
	status_buf[0] &= (~status_buf[1] & TSC_IRQ_MASK);
	irq_status[0] \|= status_buf[0];
	break;
	default:
	goto out;
	}

	for_each_bit(i, &irq_status[0], MAX8925_NUM_IRQ) {
	clear_bit(i, irq_status);
	dev_dbg(chip->dev, "Servicing IRQ #%d in %s\n", i, chip->name);

	mutex_lock(&chip->irq_lock);
	if (chip->irq[i].handler)
	chip->irq[i].handler(i, chip->irq[i].data);
	else {
	max8925_mask_irq(chip, i);
	dev_err(chip->dev, "Noboday cares IRQ #%d in %s. "
	"Now mask it.\n", i, chip->name);
	}
	mutex_unlock(&chip->irq_lock);
	}
	out:
	return IRQ_HANDLED;
	}

	int max8925_request_irq(struct max8925_chip *chip, int irq,
	irq_handler_t handler, void *data)
	{
	if ((__check_irq(irq) < 0) \|\| !handler)
	return -EINVAL;

	mutex_lock(&chip->irq_lock);
	chip->irq[irq].handler = handler;
	chip->irq[irq].data = data;
	mutex_unlock(&chip->irq_lock);
	return 0;
	}
	EXPORT_SYMBOL(max8925_request_irq);

	int max8925_free_irq(struct max8925_chip *chip, int irq)
	{
	if (__check_irq(irq) < 0)
	return -EINVAL;

	mutex_lock(&chip->irq_lock);
	chip->irq[irq].handler = NULL;
	chip->irq[irq].data = NULL;
	mutex_unlock(&chip->irq_lock);
	return 0;
	}
	EXPORT_SYMBOL(max8925_free_irq);

	static int __devinit device_gpm_init(struct max8925_chip *chip,
	struct i2c_client *i2c,
	struct max8925_platform_data *pdata)
	{
	int ret;

	/* mask all IRQs */
	ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ1_MASK, 0x7, 0x7);
	if (ret < 0)
	goto out;
	ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ2_MASK, 0xff, 0xff);
	if (ret < 0)
	goto out;
	ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff, 0xff);
	if (ret < 0)
	goto out;
	ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ2_MASK, 0x3, 0x3);
	if (ret < 0)
	goto out;

	chip->name = "GPM";
	memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
	ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
	IRQF_ONESHOT \| IRQF_TRIGGER_LOW,
	"max8925-gpm", chip);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
	goto out;
	}
	chip->chip_irq = i2c->irq;

	/* enable hard-reset for ONKEY power-off */
	max8925_set_bits(i2c, MAX8925_SYSENSEL, 0x80, 0x80);
	out:
	return ret;
	}

	static int __devinit device_adc_init(struct max8925_chip *chip,
	struct i2c_client *i2c,
	struct max8925_platform_data *pdata)
	{
	int ret;

	/* mask all IRQs */
	ret = max8925_set_bits(i2c, MAX8925_TSC_IRQ_MASK, 3, 3);

	chip->name = "ADC";
	memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
	ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
	IRQF_ONESHOT \| IRQF_TRIGGER_LOW,
	"max8925-adc", chip);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
	goto out;
	}
	chip->chip_irq = i2c->irq;
	out:
	return ret;
	}

	int __devinit max8925_device_init(struct max8925_chip *chip,
	struct max8925_platform_data *pdata)
	{
	switch (chip->chip_id) {
	case MAX8925_GPM:
	device_gpm_init(chip, chip->i2c, pdata);
	break;
	case MAX8925_ADC:
	device_adc_init(chip, chip->i2c, pdata);
	break;
	}
	return 0;
	}

	void max8925_device_exit(struct max8925_chip *chip)
	{
	if (chip->chip_irq >= 0)
	free_irq(chip->chip_irq, chip);
	}

	MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
	MODULE_LICENSE("GPL");