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linux/drivers/mfd/rc5t583-irq.c
Venu Byravarasu 0dd96360e2 mfd: rc5t583: Fix warning messages 
Two variables named master_int and sleepseq_val, were just
declared without initialization. Pointers to these variables
were passed to mfd read function. After that these variables
were used for some of the logical operations.

Though logically there is nothing wrong, compiler is complaining
that the variables may be used uninitialized.

Hence fixing these warning messages by initializing them.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-23 20:51:33 +02:00

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/*
* Interrupt driver for RICOH583 power management chip.
*
* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
* Author: Laxman dewangan <ldewangan@nvidia.com>
*
* based on code
* Copyright (C) 2011 RICOH COMPANY,LTD
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mfd/rc5t583.h>
enum int_type {
SYS_INT = 0x1,
DCDC_INT = 0x2,
RTC_INT = 0x4,
ADC_INT = 0x8,
GPIO_INT = 0x10,
};
static int gpedge_add[] = {
RC5T583_GPIO_GPEDGE2,
RC5T583_GPIO_GPEDGE2
};
static int irq_en_add[] = {
RC5T583_INT_EN_SYS1,
RC5T583_INT_EN_SYS2,
RC5T583_INT_EN_DCDC,
RC5T583_INT_EN_RTC,
RC5T583_INT_EN_ADC1,
RC5T583_INT_EN_ADC2,
RC5T583_INT_EN_ADC3,
RC5T583_GPIO_EN_INT
};
static int irq_mon_add[] = {
RC5T583_INT_MON_SYS1,
RC5T583_INT_MON_SYS2,
RC5T583_INT_MON_DCDC,
RC5T583_INT_MON_RTC,
RC5T583_INT_IR_ADCL,
RC5T583_INT_IR_ADCH,
RC5T583_INT_IR_ADCEND,
RC5T583_INT_IR_GPIOF,
RC5T583_INT_IR_GPIOR
};
static int irq_clr_add[] = {
RC5T583_INT_IR_SYS1,
RC5T583_INT_IR_SYS2,
RC5T583_INT_IR_DCDC,
RC5T583_INT_IR_RTC,
RC5T583_INT_IR_ADCL,
RC5T583_INT_IR_ADCH,
RC5T583_INT_IR_ADCEND,
RC5T583_INT_IR_GPIOF,
RC5T583_INT_IR_GPIOR
};
static int main_int_type[] = {
SYS_INT,
SYS_INT,
DCDC_INT,
RTC_INT,
ADC_INT,
ADC_INT,
ADC_INT,
GPIO_INT,
GPIO_INT,
};
struct rc5t583_irq_data {
u8 int_type;
u8 master_bit;
u8 int_en_bit;
u8 mask_reg_index;
int grp_index;
};
#define RC5T583_IRQ(_int_type, _master_bit, _grp_index, \
_int_bit, _mask_ind) \
{ \
.int_type = _int_type, \
.master_bit = _master_bit, \
.grp_index = _grp_index, \
.int_en_bit = _int_bit, \
.mask_reg_index = _mask_ind, \
}
static const struct rc5t583_irq_data rc5t583_irqs[RC5T583_MAX_IRQS] = {
[RC5T583_IRQ_ONKEY] = RC5T583_IRQ(SYS_INT, 0, 0, 0, 0),
[RC5T583_IRQ_ACOK] = RC5T583_IRQ(SYS_INT, 0, 1, 1, 0),
[RC5T583_IRQ_LIDOPEN] = RC5T583_IRQ(SYS_INT, 0, 2, 2, 0),
[RC5T583_IRQ_PREOT] = RC5T583_IRQ(SYS_INT, 0, 3, 3, 0),
[RC5T583_IRQ_CLKSTP] = RC5T583_IRQ(SYS_INT, 0, 4, 4, 0),
[RC5T583_IRQ_ONKEY_OFF] = RC5T583_IRQ(SYS_INT, 0, 5, 5, 0),
[RC5T583_IRQ_WD] = RC5T583_IRQ(SYS_INT, 0, 7, 7, 0),
[RC5T583_IRQ_EN_PWRREQ1] = RC5T583_IRQ(SYS_INT, 0, 8, 0, 1),
[RC5T583_IRQ_EN_PWRREQ2] = RC5T583_IRQ(SYS_INT, 0, 9, 1, 1),
[RC5T583_IRQ_PRE_VINDET] = RC5T583_IRQ(SYS_INT, 0, 10, 2, 1),
[RC5T583_IRQ_DC0LIM] = RC5T583_IRQ(DCDC_INT, 1, 0, 0, 2),
[RC5T583_IRQ_DC1LIM] = RC5T583_IRQ(DCDC_INT, 1, 1, 1, 2),
[RC5T583_IRQ_DC2LIM] = RC5T583_IRQ(DCDC_INT, 1, 2, 2, 2),
[RC5T583_IRQ_DC3LIM] = RC5T583_IRQ(DCDC_INT, 1, 3, 3, 2),
[RC5T583_IRQ_CTC] = RC5T583_IRQ(RTC_INT, 2, 0, 0, 3),
[RC5T583_IRQ_YALE] = RC5T583_IRQ(RTC_INT, 2, 5, 5, 3),
[RC5T583_IRQ_DALE] = RC5T583_IRQ(RTC_INT, 2, 6, 6, 3),
[RC5T583_IRQ_WALE] = RC5T583_IRQ(RTC_INT, 2, 7, 7, 3),
[RC5T583_IRQ_AIN1L] = RC5T583_IRQ(ADC_INT, 3, 0, 0, 4),
[RC5T583_IRQ_AIN2L] = RC5T583_IRQ(ADC_INT, 3, 1, 1, 4),
[RC5T583_IRQ_AIN3L] = RC5T583_IRQ(ADC_INT, 3, 2, 2, 4),
[RC5T583_IRQ_VBATL] = RC5T583_IRQ(ADC_INT, 3, 3, 3, 4),
[RC5T583_IRQ_VIN3L] = RC5T583_IRQ(ADC_INT, 3, 4, 4, 4),
[RC5T583_IRQ_VIN8L] = RC5T583_IRQ(ADC_INT, 3, 5, 5, 4),
[RC5T583_IRQ_AIN1H] = RC5T583_IRQ(ADC_INT, 3, 6, 0, 5),
[RC5T583_IRQ_AIN2H] = RC5T583_IRQ(ADC_INT, 3, 7, 1, 5),
[RC5T583_IRQ_AIN3H] = RC5T583_IRQ(ADC_INT, 3, 8, 2, 5),
[RC5T583_IRQ_VBATH] = RC5T583_IRQ(ADC_INT, 3, 9, 3, 5),
[RC5T583_IRQ_VIN3H] = RC5T583_IRQ(ADC_INT, 3, 10, 4, 5),
[RC5T583_IRQ_VIN8H] = RC5T583_IRQ(ADC_INT, 3, 11, 5, 5),
[RC5T583_IRQ_ADCEND] = RC5T583_IRQ(ADC_INT, 3, 12, 0, 6),
[RC5T583_IRQ_GPIO0] = RC5T583_IRQ(GPIO_INT, 4, 0, 0, 7),
[RC5T583_IRQ_GPIO1] = RC5T583_IRQ(GPIO_INT, 4, 1, 1, 7),
[RC5T583_IRQ_GPIO2] = RC5T583_IRQ(GPIO_INT, 4, 2, 2, 7),
[RC5T583_IRQ_GPIO3] = RC5T583_IRQ(GPIO_INT, 4, 3, 3, 7),
[RC5T583_IRQ_GPIO4] = RC5T583_IRQ(GPIO_INT, 4, 4, 4, 7),
[RC5T583_IRQ_GPIO5] = RC5T583_IRQ(GPIO_INT, 4, 5, 5, 7),
[RC5T583_IRQ_GPIO6] = RC5T583_IRQ(GPIO_INT, 4, 6, 6, 7),
[RC5T583_IRQ_GPIO7] = RC5T583_IRQ(GPIO_INT, 4, 7, 7, 7),
};
static void rc5t583_irq_lock(struct irq_data *irq_data)
{
struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
mutex_lock(&rc5t583->irq_lock);
}
static void rc5t583_irq_unmask(struct irq_data *irq_data)
{
struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->irq - rc5t583->irq_base;
const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
rc5t583->group_irq_en[data->grp_index] |= 1 << data->grp_index;
rc5t583->intc_inten_reg |= 1 << data->master_bit;
rc5t583->irq_en_reg[data->mask_reg_index] |= 1 << data->int_en_bit;
}
static void rc5t583_irq_mask(struct irq_data *irq_data)
{
struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->irq - rc5t583->irq_base;
const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
rc5t583->group_irq_en[data->grp_index] &= ~(1 << data->grp_index);
if (!rc5t583->group_irq_en[data->grp_index])
rc5t583->intc_inten_reg &= ~(1 << data->master_bit);
rc5t583->irq_en_reg[data->mask_reg_index] &= ~(1 << data->int_en_bit);
}
static int rc5t583_irq_set_type(struct irq_data *irq_data, unsigned int type)
{
struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->irq - rc5t583->irq_base;
const struct rc5t583_irq_data *data = &rc5t583_irqs[__irq];
int val = 0;
int gpedge_index;
int gpedge_bit_pos;
/* Supporting only trigger level inetrrupt */
if ((data->int_type & GPIO_INT) && (type & IRQ_TYPE_EDGE_BOTH)) {
gpedge_index = data->int_en_bit / 4;
gpedge_bit_pos = data->int_en_bit % 4;
if (type & IRQ_TYPE_EDGE_FALLING)
val |= 0x2;
if (type & IRQ_TYPE_EDGE_RISING)
val |= 0x1;
rc5t583->gpedge_reg[gpedge_index] &= ~(3 << gpedge_bit_pos);
rc5t583->gpedge_reg[gpedge_index] |= (val << gpedge_bit_pos);
rc5t583_irq_unmask(irq_data);
return 0;
}
return -EINVAL;
}
static void rc5t583_irq_sync_unlock(struct irq_data *irq_data)
{
struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
int i;
int ret;
for (i = 0; i < ARRAY_SIZE(rc5t583->gpedge_reg); i++) {
ret = rc5t583_write(rc5t583->dev, gpedge_add[i],
rc5t583->gpedge_reg[i]);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
gpedge_add[i], ret);
}
for (i = 0; i < ARRAY_SIZE(rc5t583->irq_en_reg); i++) {
ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
rc5t583->irq_en_reg[i]);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
irq_en_add[i], ret);
}
ret = rc5t583_write(rc5t583->dev, RC5T583_INTC_INTEN,
rc5t583->intc_inten_reg);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
RC5T583_INTC_INTEN, ret);
mutex_unlock(&rc5t583->irq_lock);
}
#ifdef CONFIG_PM_SLEEP
static int rc5t583_irq_set_wake(struct irq_data *irq_data, unsigned int on)
{
struct rc5t583 *rc5t583 = irq_data_get_irq_chip_data(irq_data);
return irq_set_irq_wake(rc5t583->chip_irq, on);
}
#else
#define rc5t583_irq_set_wake NULL
#endif
static irqreturn_t rc5t583_irq(int irq, void *data)
{
struct rc5t583 *rc5t583 = data;
uint8_t int_sts[RC5T583_MAX_INTERRUPT_MASK_REGS];
uint8_t master_int = 0;
int i;
int ret;
unsigned int rtc_int_sts = 0;
/* Clear the status */
for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++)
int_sts[i] = 0;
ret = rc5t583_read(rc5t583->dev, RC5T583_INTC_INTMON, &master_int);
if (ret < 0) {
dev_err(rc5t583->dev,
"Error in reading reg 0x%02x error: %d\n",
RC5T583_INTC_INTMON, ret);
return IRQ_HANDLED;
}
for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; ++i) {
if (!(master_int & main_int_type[i]))
continue;
ret = rc5t583_read(rc5t583->dev, irq_mon_add[i], &int_sts[i]);
if (ret < 0) {
dev_warn(rc5t583->dev,
"Error in reading reg 0x%02x error: %d\n",
irq_mon_add[i], ret);
int_sts[i] = 0;
continue;
}
if (main_int_type[i] & RTC_INT) {
rtc_int_sts = 0;
if (int_sts[i] & 0x1)
rtc_int_sts |= BIT(6);
if (int_sts[i] & 0x2)
rtc_int_sts |= BIT(7);
if (int_sts[i] & 0x4)
rtc_int_sts |= BIT(0);
if (int_sts[i] & 0x8)
rtc_int_sts |= BIT(5);
}
ret = rc5t583_write(rc5t583->dev, irq_clr_add[i],
~int_sts[i]);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in reading reg 0x%02x error: %d\n",
irq_clr_add[i], ret);
if (main_int_type[i] & RTC_INT)
int_sts[i] = rtc_int_sts;
}
/* Merge gpio interrupts for rising and falling case*/
int_sts[7] |= int_sts[8];
/* Call interrupt handler if enabled */
for (i = 0; i < RC5T583_MAX_IRQS; ++i) {
const struct rc5t583_irq_data *data = &rc5t583_irqs[i];
if ((int_sts[data->mask_reg_index] & (1 << data->int_en_bit)) &&
(rc5t583->group_irq_en[data->master_bit] &
(1 << data->grp_index)))
handle_nested_irq(rc5t583->irq_base + i);
}
return IRQ_HANDLED;
}
static struct irq_chip rc5t583_irq_chip = {
.name = "rc5t583-irq",
.irq_mask = rc5t583_irq_mask,
.irq_unmask = rc5t583_irq_unmask,
.irq_bus_lock = rc5t583_irq_lock,
.irq_bus_sync_unlock = rc5t583_irq_sync_unlock,
.irq_set_type = rc5t583_irq_set_type,
.irq_set_wake = rc5t583_irq_set_wake,
};
int rc5t583_irq_init(struct rc5t583 *rc5t583, int irq, int irq_base)
{
int i, ret;
if (!irq_base) {
dev_warn(rc5t583->dev, "No interrupt support on IRQ base\n");
return -EINVAL;
}
mutex_init(&rc5t583->irq_lock);
/* Initailize all int register to 0 */
for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++) {
ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
rc5t583->irq_en_reg[i]);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
irq_en_add[i], ret);
}
for (i = 0; i < RC5T583_MAX_GPEDGE_REG; i++) {
ret = rc5t583_write(rc5t583->dev, gpedge_add[i],
rc5t583->gpedge_reg[i]);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
gpedge_add[i], ret);
}
ret = rc5t583_write(rc5t583->dev, RC5T583_INTC_INTEN, 0x0);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
RC5T583_INTC_INTEN, ret);
/* Clear all interrupts in case they woke up active. */
for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++) {
ret = rc5t583_write(rc5t583->dev, irq_clr_add[i], 0);
if (ret < 0)
dev_warn(rc5t583->dev,
"Error in writing reg 0x%02x error: %d\n",
irq_clr_add[i], ret);
}
rc5t583->irq_base = irq_base;
rc5t583->chip_irq = irq;
for (i = 0; i < RC5T583_MAX_IRQS; i++) {
int __irq = i + rc5t583->irq_base;
irq_set_chip_data(__irq, rc5t583);
irq_set_chip_and_handler(__irq, &rc5t583_irq_chip,
handle_simple_irq);
irq_set_nested_thread(__irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(__irq, IRQF_VALID);
#endif
}
ret = request_threaded_irq(irq, NULL, rc5t583_irq, IRQF_ONESHOT,
"rc5t583", rc5t583);
if (ret < 0)
dev_err(rc5t583->dev,
"Error in registering interrupt error: %d\n", ret);
return ret;
}
int rc5t583_irq_exit(struct rc5t583 *rc5t583)
{
if (rc5t583->chip_irq)
free_irq(rc5t583->chip_irq, rc5t583);
return 0;
}
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