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Commit 7bcbce55 authored by Linus Walleij's avatar Linus Walleij
Browse files

gpio: pca953x: use gpiolib irqchip helpers 



This switches the PCA953x driver over to using the gpiolib irqchip
helpers to handle the threaded interrups cascaded off this
GPIO chip.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 5795cf35

drivers/gpio/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -519,6 +519,7 @@ config GPIO_PCA953X 
config GPIO_PCA953X_IRQ

	bool "Interrupt controller support for PCA953x"

	depends on GPIO_PCA953X=y

	select GPIOLIB_IRQCHIP

	help

	  Say yes here to enable the pca953x to be used as an interrupt

	  controller. It requires the driver to be built in the kernel.

drivers/gpio/gpio-pca953x.c

+32 −61
Original line number Diff line number Diff line
@@ -15,8 +15,6 @@ 
#include <linux/init.h>

#include <linux/gpio.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irqdomain.h>

#include <linux/i2c.h>

#include <linux/platform_data/pca953x.h>

#include <linux/slab.h>
@@ -91,7 +89,6 @@ struct pca953x_chip { 
	u8 irq_stat[MAX_BANK];

	u8 irq_trig_raise[MAX_BANK];

	u8 irq_trig_fall[MAX_BANK];

	struct irq_domain *domain;

#endif



	struct i2c_client *client;
@@ -100,6 +97,11 @@ struct pca953x_chip { 
	int	chip_type;

};



static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)

{

	return container_of(gc, struct pca953x_chip, gpio_chip);

}



static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,

				int off)

{
@@ -202,12 +204,10 @@ static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val) 


static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)

{

	struct pca953x_chip *chip;

	struct pca953x_chip *chip = to_pca(gc);

	u8 reg_val;

	int ret, offset = 0;



	chip = container_of(gc, struct pca953x_chip, gpio_chip);



	mutex_lock(&chip->i2c_lock);

	reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
@@ -233,12 +233,10 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) 
static int pca953x_gpio_direction_output(struct gpio_chip *gc,

		unsigned off, int val)

{

	struct pca953x_chip *chip;

	struct pca953x_chip *chip = to_pca(gc);

	u8 reg_val;

	int ret, offset = 0;



	chip = container_of(gc, struct pca953x_chip, gpio_chip);



	mutex_lock(&chip->i2c_lock);

	/* set output level */

	if (val)
@@ -285,12 +283,10 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc, 


static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)

{

	struct pca953x_chip *chip;

	struct pca953x_chip *chip = to_pca(gc);

	u32 reg_val;

	int ret, offset = 0;



	chip = container_of(gc, struct pca953x_chip, gpio_chip);



	mutex_lock(&chip->i2c_lock);

	switch (chip->chip_type) {

	case PCA953X_TYPE:
@@ -315,12 +311,10 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) 


static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)

{

	struct pca953x_chip *chip;

	struct pca953x_chip *chip = to_pca(gc);

	u8 reg_val;

	int ret, offset = 0;



	chip = container_of(gc, struct pca953x_chip, gpio_chip);



	mutex_lock(&chip->i2c_lock);

	if (val)

		reg_val = chip->reg_output[off / BANK_SZ]
@@ -367,38 +361,34 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios) 
}



#ifdef CONFIG_GPIO_PCA953X_IRQ

static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)

{

	struct pca953x_chip *chip;



	chip = container_of(gc, struct pca953x_chip, gpio_chip);

	return irq_create_mapping(chip->domain, off);

}



static void pca953x_irq_mask(struct irq_data *d)

{

	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);

	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);

	struct pca953x_chip *chip = to_pca(gc);



	chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));

}



static void pca953x_irq_unmask(struct irq_data *d)

{

	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);

	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);

	struct pca953x_chip *chip = to_pca(gc);



	chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);

}



static void pca953x_irq_bus_lock(struct irq_data *d)

{

	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);

	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);

	struct pca953x_chip *chip = to_pca(gc);



	mutex_lock(&chip->irq_lock);

}



static void pca953x_irq_bus_sync_unlock(struct irq_data *d)

{

	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);

	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);

	struct pca953x_chip *chip = to_pca(gc);

	u8 new_irqs;

	int level, i;
@@ -420,7 +410,8 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d) 


static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)

{

	struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);

	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);

	struct pca953x_chip *chip = to_pca(gc);

	int bank_nb = d->hwirq / BANK_SZ;

	u8 mask = 1 << (d->hwirq % BANK_SZ);
@@ -512,7 +503,7 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid) 
	for (i = 0; i < NBANK(chip); i++) {

		while (pending[i]) {

			level = __ffs(pending[i]);

			handle_nested_irq(irq_find_mapping(chip->domain,

			handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,

							level + (BANK_SZ * i)));

			pending[i] &= ~(1 << level);

			nhandled++;
@@ -522,27 +513,6 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid) 
	return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;

}



static int pca953x_gpio_irq_map(struct irq_domain *d, unsigned int irq,

		       irq_hw_number_t hwirq)

{

	irq_clear_status_flags(irq, IRQ_NOREQUEST);

	irq_set_chip_data(irq, d->host_data);

	irq_set_chip(irq, &pca953x_irq_chip);

	irq_set_nested_thread(irq, true);

#ifdef CONFIG_ARM

	set_irq_flags(irq, IRQF_VALID);

#else

	irq_set_noprobe(irq);

#endif



	return 0;

}



static const struct irq_domain_ops pca953x_irq_simple_ops = {

	.map = pca953x_gpio_irq_map,

	.xlate = irq_domain_xlate_twocell,

};



static int pca953x_irq_setup(struct pca953x_chip *chip,

			     const struct i2c_device_id *id,

			     int irq_base)
@@ -574,14 +544,6 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, 
			chip->irq_stat[i] &= chip->reg_direction[i];

		mutex_init(&chip->irq_lock);



		chip->domain = irq_domain_add_simple(client->dev.of_node,

						chip->gpio_chip.ngpio,

						irq_base,

						&pca953x_irq_simple_ops,

						chip);

		if (!chip->domain)

			return -ENODEV;



		ret = devm_request_threaded_irq(&client->dev,

					client->irq,

					   NULL,
@@ -595,7 +557,16 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, 
			return ret;

		}



		chip->gpio_chip.to_irq = pca953x_gpio_to_irq;

		ret =  gpiochip_irqchip_add(&chip->gpio_chip,

					    &pca953x_irq_chip,

					    irq_base,

					    handle_simple_irq,

					    IRQ_TYPE_NONE);

		if (ret) {

			dev_err(&client->dev,

				"could not connect irqchip to gpiochip\n");

			return ret;

		}

	}



	return 0;
@@ -759,11 +730,11 @@ static int pca953x_probe(struct i2c_client *client, 
	if (ret)

		return ret;



	ret = pca953x_irq_setup(chip, id, irq_base);

	ret = gpiochip_add(&chip->gpio_chip);

	if (ret)

		return ret;



	ret = gpiochip_add(&chip->gpio_chip);

	ret = pca953x_irq_setup(chip, id, irq_base);

	if (ret)

		return ret;