/*
* Copyright (C) ST-Ericsson SA 2011
*
* Author: BIBEK BASU <bibek.basu@stericsson.com>
* License terms: GNU General Public License (GPL) version 2
*
* 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/types.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/ab8500.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/ab8500/gpio.h>
/*
* GPIO registers offset
* Bank: 0x10
*/
#define AB8500_GPIO_SEL1_REG 0x00
#define AB8500_GPIO_SEL2_REG 0x01
#define AB8500_GPIO_SEL3_REG 0x02
#define AB8500_GPIO_SEL4_REG 0x03
#define AB8500_GPIO_SEL5_REG 0x04
#define AB8500_GPIO_SEL6_REG 0x05
#define AB8500_GPIO_DIR1_REG 0x10
#define AB8500_GPIO_DIR2_REG 0x11
#define AB8500_GPIO_DIR3_REG 0x12
#define AB8500_GPIO_DIR4_REG 0x13
#define AB8500_GPIO_DIR5_REG 0x14
#define AB8500_GPIO_DIR6_REG 0x15
#define AB8500_GPIO_OUT1_REG 0x20
#define AB8500_GPIO_OUT2_REG 0x21
#define AB8500_GPIO_OUT3_REG 0x22
#define AB8500_GPIO_OUT4_REG 0x23
#define AB8500_GPIO_OUT5_REG 0x24
#define AB8500_GPIO_OUT6_REG 0x25
#define AB8500_GPIO_PUD1_REG 0x30
#define AB8500_GPIO_PUD2_REG 0x31
#define AB8500_GPIO_PUD3_REG 0x32
#define AB8500_GPIO_PUD4_REG 0x33
#define AB8500_GPIO_PUD5_REG 0x34
#define AB8500_GPIO_PUD6_REG 0x35
#define AB8500_GPIO_IN1_REG 0x40
#define AB8500_GPIO_IN2_REG 0x41
#define AB8500_GPIO_IN3_REG 0x42
#define AB8500_GPIO_IN4_REG 0x43
#define AB8500_GPIO_IN5_REG 0x44
#define AB8500_GPIO_IN6_REG 0x45
#define AB8500_GPIO_ALTFUN_REG 0x45
#define ALTFUN_REG_INDEX 6
#define AB8500_NUM_GPIO 42
#define AB8500_NUM_VIR_GPIO_IRQ 16
enum ab8500_gpio_action {
NONE,
STARTUP,
SHUTDOWN,
MASK,
UNMASK
};
struct ab8500_gpio {
struct gpio_chip chip;
struct ab8500 *parent;
struct device *dev;
struct mutex lock;
u32 irq_base;
enum ab8500_gpio_action irq_action;
u16 rising;
u16 falling;
};
/**
* to_ab8500_gpio() - get the pointer to ab8500_gpio
* @chip: Member of the structure ab8500_gpio
*/
static inline struct ab8500_gpio *to_ab8500_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct ab8500_gpio, chip);
}
static int ab8500_gpio_set_bits(struct gpio_chip *chip, u8 reg,
unsigned offset, int val)
{
struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
u8 pos = offset % 8;
int ret;
reg = reg + (offset / 8);
ret = abx500_mask_and_set_register_interruptible(ab8500_gpio->dev,
AB8500_MISC, reg, 1 << pos, val << pos);
if (ret < 0)
dev_err(ab8500_gpio->dev, "%s write failed\n", __func__);
return ret;
}
/**
* ab8500_gpio_get() - Get the particular GPIO value
* @chip: Gpio device
* @offset: GPIO number to read
*/
static int ab8500_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
u8 mask = 1 << (offset % 8);
u8 reg = AB8500_GPIO_OUT1_REG + (offset / 8);
int ret;
u8 data;
ret = abx500_get_register_interruptible(ab8500_gpio->dev, AB8500_MISC,
reg, &data);
if (ret < 0) {
dev_err(ab8500_gpio->dev, "%s read failed\n", __func__);
return ret;
}
return (data & mask) >> (offset % 8);
}
static void ab8500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
int ret;
/* Write the data */
ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, 1);
if (ret < 0)
dev_err(ab8500_gpio->dev, "%s write failed\n", __func__);
}
static int ab8500_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int val)
{
int ret;
/* set direction as output */
ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 1);
if (ret < 0)
return ret;
/* disable pull down */
ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_PUD1_REG, offset, 1);
if (ret < 0)
return ret;
/* set the output as 1 or 0 */
return ab8500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
}
static int ab8500_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
/* set the register as input */
return ab8500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 0);
}
static int ab8500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
/*
* Only some GPIOs are interrupt capable, and they are
* organized in discontiguous clusters:
*
* GPIO6 to GPIO13
* GPIO24 and GPIO25
* GPIO36 to GPIO41
*/
static struct ab8500_gpio_irq_cluster {
int start;
int end;
} clusters[] = {
{.start = 6, .end = 13},
{.start = 24, .end = 25},
{.start = 36, .end = 41},
};
struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
int base = ab8500_gpio->irq_base;
int i;
for (i = 0; i < ARRAY_SIZE(clusters); i++) {
struct ab8500_gpio_irq_cluster *cluster = &clusters[i];
if (offset >= cluster->start && offset <= cluster->end)
return base + offset - cluster->start;
/* Advance by the number of gpios in this cluster */
base += cluster->end - cluster->start + 1;
}
return -EINVAL;
}
static struct gpio_chip ab8500gpio_chip = {
.label = "ab8500_gpio",
.owner = THIS_MODULE,
.direction_input = ab8500_gpio_direction_input,
.get = ab8500_gpio_get,
.direction_output = ab8500_gpio_direction_output,
.set = ab8500_gpio_set,
.to_irq = ab8500_gpio_to_irq,
};
static unsigned int irq_to_rising(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
int offset = irq - ab8500_gpio->irq_base;
int new_irq = offset + AB8500_INT_GPIO6R
+ ab8500_gpio->parent->irq_base;
return new_irq;
}
static unsigned int irq_to_falling(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
int offset = irq - ab8500_gpio->irq_base;
int new_irq = offset + AB8500_INT_GPIO6F
+ ab8500_gpio->parent->irq_base;
return new_irq;
}
static unsigned int rising_to_irq(unsigned int irq, void *dev)
{
struct ab8500_gpio *ab8500_gpio = dev;
int offset = irq - AB8500_INT_GPIO6R
- ab8500_gpio->parent->irq_base ;
int new_irq = offset + ab8500_gpio->irq_base;
return new_irq;
}
static unsigned int falling_to_irq(unsigned int irq, void *dev)
{
struct ab8500_gpio *ab8500_gpio = dev;
int offset = irq - AB8500_INT_GPIO6F
- ab8500_gpio->parent->irq_base ;
int new_irq = offset + ab8500_gpio->irq_base;
return new_irq;
}
/*
* IRQ handler
*/
static irqreturn_t handle_rising(int irq, void *dev)
{
handle_nested_irq(rising_to_irq(irq , dev));
return IRQ_HANDLED;
}
static irqreturn_t handle_falling(int irq, void *dev)
{
handle_nested_irq(falling_to_irq(irq, dev));
return IRQ_HANDLED;
}
static void ab8500_gpio_irq_lock(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
mutex_lock(&ab8500_gpio->lock);
}
static void ab8500_gpio_irq_sync_unlock(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
int offset = irq - ab8500_gpio->irq_base;
bool rising = ab8500_gpio->rising & BIT(offset);
bool falling = ab8500_gpio->falling & BIT(offset);
int ret;
switch (ab8500_gpio->irq_action) {
case STARTUP:
if (rising)
ret = request_threaded_irq(irq_to_rising(irq),
NULL, handle_rising,
IRQF_TRIGGER_RISING,
"ab8500-gpio-r", ab8500_gpio);
if (falling)
ret = request_threaded_irq(irq_to_falling(irq),
NULL, handle_falling,
IRQF_TRIGGER_FALLING,
"ab8500-gpio-f", ab8500_gpio);
break;
case SHUTDOWN:
if (rising)
free_irq(irq_to_rising(irq), ab8500_gpio);
if (falling)
free_irq(irq_to_falling(irq), ab8500_gpio);
break;
case MASK:
if (rising)
disable_irq(irq_to_rising(irq));
if (falling)
disable_irq(irq_to_falling(irq));
break;
case UNMASK:
if (rising)
enable_irq(irq_to_rising(irq));
if (falling)
enable_irq(irq_to_falling(irq));
break;
case NONE:
break;
}
ab8500_gpio->irq_action = NONE;
ab8500_gpio->rising &= ~(BIT(offset));
ab8500_gpio->falling &= ~(BIT(offset));
mutex_unlock(&ab8500_gpio->lock);
}
static void ab8500_gpio_irq_mask(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
ab8500_gpio->irq_action = MASK;
}
static void ab8500_gpio_irq_unmask(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
ab8500_gpio->irq_action = UNMASK;
}
static int ab8500_gpio_irq_set_type(unsigned int irq, unsigned int type)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
int offset = irq - ab8500_gpio->irq_base;
if (type == IRQ_TYPE_EDGE_BOTH) {
ab8500_gpio->rising = BIT(offset);
ab8500_gpio->falling = BIT(offset);
} else if (type == IRQ_TYPE_EDGE_RISING) {
ab8500_gpio->rising = BIT(offset);
} else {
ab8500_gpio->falling = BIT(offset);
}
return 0;
}
unsigned int ab8500_gpio_irq_startup(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
ab8500_gpio->irq_action = STARTUP;
return 0;
}
void ab8500_gpio_irq_shutdown(unsigned int irq)
{
struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
ab8500_gpio->irq_action = SHUTDOWN;
}
static struct irq_chip ab8500_gpio_irq_chip = {
.name = "ab8500-gpio",
.startup = ab8500_gpio_irq_startup,
.shutdown = ab8500_gpio_irq_shutdown,
.bus_lock = ab8500_gpio_irq_lock,
.bus_sync_unlock = ab8500_gpio_irq_sync_unlock,
.mask = ab8500_gpio_irq_mask,
.unmask = ab8500_gpio_irq_unmask,
.set_type = ab8500_gpio_irq_set_type,
};
static int ab8500_gpio_irq_init(struct ab8500_gpio *ab8500_gpio)
{
u32 base = ab8500_gpio->irq_base;
int irq;
for (irq = base; irq < base + AB8500_NUM_VIR_GPIO_IRQ ; irq++) {
set_irq_chip_data(irq, ab8500_gpio);
set_irq_chip_and_handler(irq, &ab8500_gpio_irq_chip,
handle_simple_irq);
set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
set_irq_noprobe(irq);
#endif
}
return 0;
}
static void ab8500_gpio_irq_remove(struct ab8500_gpio *ab8500_gpio)
{
int base = ab8500_gpio->irq_base;
int irq;
for (irq = base; irq < base + AB8500_NUM_VIR_GPIO_IRQ; irq++) {
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
set_irq_chip_and_handler(irq, NULL, NULL);
set_irq_chip_data(irq, NULL);
}
}
static int __devinit ab8500_gpio_probe(struct platform_device *pdev)
{
struct ab8500_platform_data *ab8500_pdata =
dev_get_platdata(pdev->dev.parent);
struct ab8500_gpio_platform_data *pdata;
struct ab8500_gpio *ab8500_gpio;
int ret;
int i;
pdata = ab8500_pdata->gpio;
if (!pdata) {
dev_err(&pdev->dev, "gpio platform data missing\n");
return -ENODEV;
}
ab8500_gpio = kzalloc(sizeof(struct ab8500_gpio), GFP_KERNEL);
if (ab8500_gpio == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
ab8500_gpio->dev = &pdev->dev;
ab8500_gpio->parent = dev_get_drvdata(pdev->dev.parent);
ab8500_gpio->chip = ab8500gpio_chip;
ab8500_gpio->chip.ngpio = AB8500_NUM_GPIO;
ab8500_gpio->chip.dev = &pdev->dev;
ab8500_gpio->chip.base = pdata->gpio_base;
ab8500_gpio->irq_base = pdata->irq_base;
/* initialize the lock */
mutex_init(&ab8500_gpio->lock);
/*
* AB8500 core will handle and clear the IRQ
* configre GPIO based on config-reg value.
* These values are for selecting the PINs as
* GPIO or alternate function
*/
for (i = AB8500_GPIO_SEL1_REG; i <= AB8500_GPIO_SEL6_REG; i++) {
ret = abx500_set_register_interruptible(ab8500_gpio->dev,
AB8500_MISC, i,
pdata->config_reg[i]);
if (ret < 0)
goto out_free;
}
ret = abx500_set_register_interruptible(ab8500_gpio->dev, AB8500_MISC,
AB8500_GPIO_ALTFUN_REG,
pdata->config_reg[ALTFUN_REG_INDEX]);
if (ret < 0)
goto out_free;
ret = ab8500_gpio_irq_init(ab8500_gpio);
if (ret)
goto out_free;
ret = gpiochip_add(&ab8500_gpio->chip);
if (ret) {
dev_err(&pdev->dev, "unable to add gpiochip: %d\n",
ret);
goto out_rem_irq;
}
platform_set_drvdata(pdev, ab8500_gpio);
return 0;
out_rem_irq:
ab8500_gpio_irq_remove(ab8500_gpio);
out_free:
mutex_destroy(&ab8500_gpio->lock);
kfree(ab8500_gpio);
return ret;
}
/*
* ab8500_gpio_remove() - remove Ab8500-gpio driver
* @pdev : Platform device registered
*/
static int __devexit ab8500_gpio_remove(struct platform_device *pdev)
{
struct ab8500_gpio *ab8500_gpio = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&ab8500_gpio->chip);
if (ret < 0) {
dev_err(ab8500_gpio->dev, "unable to remove gpiochip: %d\n",
ret);
return ret;
}
platform_set_drvdata(pdev, NULL);
mutex_destroy(&ab8500_gpio->lock);
kfree(ab8500_gpio);
return 0;
}
static struct platform_driver ab8500_gpio_driver = {
.driver = {
.name = "ab8500-gpio",
.owner = THIS_MODULE,
},
.probe = ab8500_gpio_probe,
.remove = __devexit_p(ab8500_gpio_remove),
};
static int __init ab8500_gpio_init(void)
{
return platform_driver_register(&ab8500_gpio_driver);
}
arch_initcall(ab8500_gpio_init);
static void __exit ab8500_gpio_exit(void)
{
platform_driver_unregister(&ab8500_gpio_driver);
}
module_exit(ab8500_gpio_exit);
MODULE_AUTHOR("BIBEK BASU <bibek.basu@stericsson.com>");
MODULE_DESCRIPTION("Driver allows to use AB8500 unused pins to be used as GPIO");
MODULE_ALIAS("AB8500 GPIO driver");
MODULE_LICENSE("GPL v2");
