+++ /dev/null
-/*
- * 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 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 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 = 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");
projects / linux-beck.git / commitdiff