521 строка
13 KiB
C
521 строка
13 KiB
C
/*
|
|
* 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/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("platform:ab8500-gpio");
|
|
MODULE_LICENSE("GPL v2");
|