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Code Issues Releases Wiki Activity

gpio: vf610: use container_of() to get state container 

The state container of the vf610 GPIO driver is sometimes
extracted from the gpio_chip exploiting the fact that offsetof()
the struct gpio_chip inside the struct vf610_gpio_port is 0, so
the container_of() is in practice a noop. However if a member
is added to struct vf610_gpio_port 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.

Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2015-08-27 14:13:46 +02:00
parent 218f1f8b50
commit 2f930643c5
1 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/gpio/gpio-vf610.c
View File

@ -62,6 +62,11 @@ struct vf610_gpio_port {
static struct irq_chip vf610_gpio_irq_chip;
static struct vf610_gpio_port *to_vf610_gp(struct gpio_chip *gc)
{
return container_of(gc, struct vf610_gpio_port, gc);
}
static const struct of_device_id vf610_gpio_dt_ids[] = {
{ .compatible = "fsl,vf610-gpio" },
{ /* sentinel */ }
@ -89,16 +94,14 @@ static void vf610_gpio_free(struct gpio_chip *chip, unsigned offset)
static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct vf610_gpio_port *port =
container_of(gc, struct vf610_gpio_port, gc);
struct vf610_gpio_port *port = to_vf610_gp(gc);
return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR) & BIT(gpio));
}
static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct vf610_gpio_port *port =
container_of(gc, struct vf610_gpio_port, gc);
struct vf610_gpio_port *port = to_vf610_gp(gc);
unsigned long mask = BIT(gpio);
if (val)
@ -122,7 +125,8 @@ static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
static void vf610_gpio_irq_handler(struct irq_desc *desc)
{
struct vf610_gpio_port *port = irq_desc_get_handler_data(desc);
struct vf610_gpio_port *port =
to_vf610_gp(irq_desc_get_handler_data(desc));
struct irq_chip *chip = irq_desc_get_chip(desc);
int pin;
unsigned long irq_isfr;
@ -142,7 +146,8 @@ static void vf610_gpio_irq_handler(struct irq_desc *desc)
static void vf610_gpio_irq_ack(struct irq_data *d)
{
struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
struct vf610_gpio_port *port =
to_vf610_gp(irq_data_get_irq_chip_data(d));
int gpio = d->hwirq;
vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
@ -150,7 +155,8 @@ static void vf610_gpio_irq_ack(struct irq_data *d)
static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
{
struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
struct vf610_gpio_port *port =
to_vf610_gp(irq_data_get_irq_chip_data(d));
u8 irqc;
switch (type) {
@ -185,7 +191,8 @@ static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
static void vf610_gpio_irq_mask(struct irq_data *d)
{
struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
struct vf610_gpio_port *port =
to_vf610_gp(irq_data_get_irq_chip_data(d));
void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
vf610_gpio_writel(0, pcr_base);
@ -193,7 +200,8 @@ static void vf610_gpio_irq_mask(struct irq_data *d)
static void vf610_gpio_irq_unmask(struct irq_data *d)
{
struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
struct vf610_gpio_port *port =
to_vf610_gp(irq_data_get_irq_chip_data(d));
void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
@ -202,7 +210,8 @@ static void vf610_gpio_irq_unmask(struct irq_data *d)
static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
{
struct vf610_gpio_port *port = irq_data_get_irq_chip_data(d);
struct vf610_gpio_port *port =
to_vf610_gp(irq_data_get_irq_chip_data(d));
if (enable)
enable_irq_wake(port->irq);