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

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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: Harini Katakam <harinik@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2015-08-27 14:26:46 +02:00
parent 2f930643c5
commit fa9795d112
1 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/gpio/gpio-zynq.c
View File

@ -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);