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gpio: sx150x: use container_of() to get state container

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The state container of the sx150x GPIO driver is sometimes
extracted from the gpio_chip exploiting the fact that offsetof()
the struct gpio_chip inside the struct sx150x_chip is 0, so
the container_of() is in practice a noop. However if a member
is added to struct sx150_chip 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.

Cc: Wei Chen <Wei.Chen@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2015-08-25 11:26:04 +02:00
parent 231d51b8a4
commit 218f1f8b50
1 changed files with 14 additions and 17 deletions
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31
drivers/gpio/gpio-sx150x.c
View file

@ -160,6 +160,11 @@ static const struct of_device_id sx150x_of_match[] = {
};
MODULE_DEVICE_TABLE(of, sx150x_of_match);
struct sx150x_chip *to_sx150x(struct gpio_chip *gc)
{
return container_of(gc, struct sx150x_chip, gpio_chip);
}
static s32 sx150x_i2c_write(struct i2c_client *client, u8 reg, u8 val)
{
s32 err = i2c_smbus_write_byte_data(client, reg, val);
@ -296,11 +301,9 @@ static int sx150x_io_output(struct sx150x_chip *chip, unsigned offset, int val)
static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
{
struct sx150x_chip *chip;
struct sx150x_chip *chip = to_sx150x(gc);
int status = -EINVAL;
chip = container_of(gc, struct sx150x_chip, gpio_chip);
if (!offset_is_oscio(chip, offset)) {
mutex_lock(&chip->lock);
status = sx150x_get_io(chip, offset);
@ -312,9 +315,7 @@ static int sx150x_gpio_get(struct gpio_chip *gc, unsigned offset)
static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
{
struct sx150x_chip *chip;
chip = container_of(gc, struct sx150x_chip, gpio_chip);
struct sx150x_chip *chip = to_sx150x(gc);
mutex_lock(&chip->lock);
if (offset_is_oscio(chip, offset))
@ -326,11 +327,9 @@ static void sx150x_gpio_set(struct gpio_chip *gc, unsigned offset, int val)
static int sx150x_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct sx150x_chip *chip;
struct sx150x_chip *chip = to_sx150x(gc);
int status = -EINVAL;
chip = container_of(gc, struct sx150x_chip, gpio_chip);
if (!offset_is_oscio(chip, offset)) {
mutex_lock(&chip->lock);
status = sx150x_io_input(chip, offset);
@ -343,11 +342,9 @@ static int sx150x_gpio_direction_output(struct gpio_chip *gc,
unsigned offset,
int val)
{
struct sx150x_chip *chip;
struct sx150x_chip *chip = to_sx150x(gc);
int status = 0;
chip = container_of(gc, struct sx150x_chip, gpio_chip);
if (!offset_is_oscio(chip, offset)) {
mutex_lock(&chip->lock);
status = sx150x_io_output(chip, offset, val);
@ -358,7 +355,7 @@ static int sx150x_gpio_direction_output(struct gpio_chip *gc,
static void sx150x_irq_mask(struct irq_data *d)
{
struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d));
unsigned n = d->hwirq;
chip->irq_masked |= (1 << n);
@ -367,7 +364,7 @@ static void sx150x_irq_mask(struct irq_data *d)
static void sx150x_irq_unmask(struct irq_data *d)
{
struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d));
unsigned n = d->hwirq;
chip->irq_masked &= ~(1 << n);
@ -376,7 +373,7 @@ static void sx150x_irq_unmask(struct irq_data *d)
static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d));
unsigned n, val = 0;
if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
@ -431,14 +428,14 @@ static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
static void sx150x_irq_bus_lock(struct irq_data *d)
{
struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d));
mutex_lock(&chip->lock);
}
static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
{
struct sx150x_chip *chip = irq_data_get_irq_chip_data(d);
struct sx150x_chip *chip = to_sx150x(irq_data_get_irq_chip_data(d));
unsigned n;
if (chip->irq_update == NO_UPDATE_PENDING)