gpio: pcf857x: use gpiochip data pointer

This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: George Cherian <george.cherian@ti.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index f64380a..709cd3f 100644 (file)
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -137,7 +137,7 @@ static int i2c_read_le16(struct i2c_client *client)
 
 static int pcf857x_input(struct gpio_chip *chip, unsigned offset)
 {
-       struct pcf857x  *gpio = container_of(chip, struct pcf857x, chip);
+       struct pcf857x  *gpio = gpiochip_get_data(chip);
        int             status;
 
        mutex_lock(&gpio->lock);
@@ -150,7 +150,7 @@ static int pcf857x_input(struct gpio_chip *chip, unsigned offset)
 
 static int pcf857x_get(struct gpio_chip *chip, unsigned offset)
 {
-       struct pcf857x  *gpio = container_of(chip, struct pcf857x, chip);
+       struct pcf857x  *gpio = gpiochip_get_data(chip);
        int             value;
 
        value = gpio->read(gpio->client);
@@ -159,7 +159,7 @@ static int pcf857x_get(struct gpio_chip *chip, unsigned offset)
 
 static int pcf857x_output(struct gpio_chip *chip, unsigned offset, int value)
 {
-       struct pcf857x  *gpio = container_of(chip, struct pcf857x, chip);
+       struct pcf857x  *gpio = gpiochip_get_data(chip);
        unsigned        bit = 1 << offset;
        int             status;
 
@@ -372,7 +372,7 @@ static int pcf857x_probe(struct i2c_client *client,
        gpio->out = ~n_latch;
        gpio->status = gpio->out;
 
-       status = gpiochip_add(&gpio->chip);
+       status = gpiochip_add_data(&gpio->chip, gpio);
        if (status < 0)
                goto fail;