Commit a718ff6f authored by Linus Walleij's avatar Linus Walleij
Browse files

gpio: delete AB8500 driver 



The AB8500 GPIO driver has been marked BROKEN for ages, and we
have something better in store: a shiny new pinctrl driver. So
let use delete this old driver as the first step.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 56813f79

drivers/gpio/Kconfig

+0 −6
Original line number Diff line number Diff line
@@ -657,12 +657,6 @@ config GPIO_JANZ_TTL 
	  This driver provides support for driving the pins in output

	  mode only. Input mode is not supported.



config GPIO_AB8500

	bool "ST-Ericsson AB8500 Mixed Signal Circuit gpio functions"

	depends on AB8500_CORE && BROKEN

	help

	  Select this to enable the AB8500 IC GPIO driver



config GPIO_TPS6586X

	bool "TPS6586X GPIO"

	depends on MFD_TPS6586X

drivers/gpio/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -10,7 +10,6 @@ obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o 
obj-$(CONFIG_GPIO_GENERIC)	+= gpio-generic.o



obj-$(CONFIG_GPIO_74X164)	+= gpio-74x164.o

obj-$(CONFIG_GPIO_AB8500)	+= gpio-ab8500.o

obj-$(CONFIG_GPIO_ADNP)		+= gpio-adnp.o

obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o

obj-$(CONFIG_GPIO_ADP5588)	+= gpio-adp5588.o

drivers/gpio/gpio-ab8500.c

deleted100644 → 0
+0 −520
Original line number Diff line number Diff line 
/*

 * 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");