Commit fa9795d1 authored by Linus Walleij's avatar Linus Walleij
Browse files

gpio: zynq: use container_of() to get state container 



The state container of the Zynq GPIO driver is sometimes
extracted from the gpio_chip exploiting the fact that offsetof()
the struct gpio_chip inside the struct zynq_gpio is 0, so
the container_of() is in practice a noop. However if a member
is added to struct zynq_gpio in front of struct gpio_chip,
things will break. Using proper container_of() avoids this
problem.

Semantically this is a noop, the compiler will optimize it away,
but syntactically it makes me happier.

Also replace some explicit container_of() calls with the helper
function.

Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Ezra Savard <ezra.savard@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Acked-by: default avatarHarini Katakam <harinik@xilinx.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 2f930643

drivers/gpio/gpio-zynq.c

+22 −10
Original line number Diff line number Diff line
@@ -130,6 +130,12 @@ struct zynq_platform_data { 


static struct irq_chip zynq_gpio_level_irqchip;

static struct irq_chip zynq_gpio_edge_irqchip;



static struct zynq_gpio *to_zynq_gpio(struct gpio_chip *gc)

{

	return container_of(gc, struct zynq_gpio, chip);

}



/**

 * zynq_gpio_get_bank_pin - Get the bank number and pin number within that bank

 * for a given pin in the GPIO device
@@ -177,7 +183,7 @@ static int zynq_gpio_get_value(struct gpio_chip *chip, unsigned int pin) 
{

	u32 data;

	unsigned int bank_num, bank_pin_num;

	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);

	struct zynq_gpio *gpio = to_zynq_gpio(chip);



	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -201,7 +207,7 @@ static void zynq_gpio_set_value(struct gpio_chip *chip, unsigned int pin, 
				int state)

{

	unsigned int reg_offset, bank_num, bank_pin_num;

	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);

	struct zynq_gpio *gpio = to_zynq_gpio(chip);



	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -238,7 +244,7 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin) 
{

	u32 reg;

	unsigned int bank_num, bank_pin_num;

	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);

	struct zynq_gpio *gpio = to_zynq_gpio(chip);



	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -271,7 +277,7 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin, 
{

	u32 reg;

	unsigned int bank_num, bank_pin_num;

	struct zynq_gpio *gpio = container_of(chip, struct zynq_gpio, chip);

	struct zynq_gpio *gpio = to_zynq_gpio(chip);



	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -301,7 +307,8 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin, 
static void zynq_gpio_irq_mask(struct irq_data *irq_data)

{

	unsigned int device_pin_num, bank_num, bank_pin_num;

	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);

	struct zynq_gpio *gpio =

		to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));



	device_pin_num = irq_data->hwirq;

	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
@@ -321,7 +328,8 @@ static void zynq_gpio_irq_mask(struct irq_data *irq_data) 
static void zynq_gpio_irq_unmask(struct irq_data *irq_data)

{

	unsigned int device_pin_num, bank_num, bank_pin_num;

	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);

	struct zynq_gpio *gpio =

		to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));



	device_pin_num = irq_data->hwirq;

	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
@@ -340,7 +348,8 @@ static void zynq_gpio_irq_unmask(struct irq_data *irq_data) 
static void zynq_gpio_irq_ack(struct irq_data *irq_data)

{

	unsigned int device_pin_num, bank_num, bank_pin_num;

	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);

	struct zynq_gpio *gpio =

		to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));



	device_pin_num = irq_data->hwirq;

	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
@@ -390,7 +399,8 @@ static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type) 
{

	u32 int_type, int_pol, int_any;

	unsigned int device_pin_num, bank_num, bank_pin_num;

	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(irq_data);

	struct zynq_gpio *gpio =

		to_zynq_gpio(irq_data_get_irq_chip_data(irq_data));



	device_pin_num = irq_data->hwirq;

	zynq_gpio_get_bank_pin(device_pin_num, &bank_num, &bank_pin_num, gpio);
@@ -453,7 +463,8 @@ static int zynq_gpio_set_irq_type(struct irq_data *irq_data, unsigned int type) 


static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)

{

	struct zynq_gpio *gpio = irq_data_get_irq_chip_data(data);

	struct zynq_gpio *gpio =

		to_zynq_gpio(irq_data_get_irq_chip_data(data));



	irq_set_irq_wake(gpio->irq, on);
@@ -518,7 +529,8 @@ static void zynq_gpio_irqhandler(struct irq_desc *desc) 
{

	u32 int_sts, int_enb;

	unsigned int bank_num;

	struct zynq_gpio *gpio = irq_desc_get_handler_data(desc);

	struct zynq_gpio *gpio =

		to_zynq_gpio(irq_desc_get_handler_data(desc));

	struct irq_chip *irqchip = irq_desc_get_chip(desc);



	chained_irq_enter(irqchip, desc);

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