/*
* 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");
