gpio: cs5535: 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: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-cs5535.c b/drivers/gpio/gpio-cs5535.c
index 7b0b198a563dbe68a64f940724679f50c30d5c48..eccb712e09fb1109d27bf34f2861176451c332a5 100644 (file)
--- a/drivers/gpio/gpio-cs5535.c
+++ b/drivers/gpio/gpio-cs5535.c
@@ -42,6 +42,10 @@ static ulong mask = GPIO_DEFAULT_MASK;
 module_param_named(mask, mask, ulong, 0444);
 MODULE_PARM_DESC(mask, "GPIO channel mask.");
 
+/*
+ * FIXME: convert this singleton driver to use the state container
+ * design pattern, see Documentation/driver-model/design-patterns.txt
+ */
 static struct cs5535_gpio_chip {
        struct gpio_chip chip;
        resource_size_t base;
@@ -201,8 +205,7 @@ EXPORT_SYMBOL_GPL(cs5535_gpio_setup_event);
 
 static int chip_gpio_request(struct gpio_chip *c, unsigned offset)
 {
-       struct cs5535_gpio_chip *chip =
-               container_of(c, struct cs5535_gpio_chip, chip);
+       struct cs5535_gpio_chip *chip = gpiochip_get_data(c);
        unsigned long flags;
 
        spin_lock_irqsave(&chip->lock, flags);
@@ -242,8 +245,7 @@ static void chip_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
 
 static int chip_direction_input(struct gpio_chip *c, unsigned offset)
 {
-       struct cs5535_gpio_chip *chip =
-               container_of(c, struct cs5535_gpio_chip, chip);
+       struct cs5535_gpio_chip *chip = gpiochip_get_data(c);
        unsigned long flags;
 
        spin_lock_irqsave(&chip->lock, flags);
@@ -256,8 +258,7 @@ static int chip_direction_input(struct gpio_chip *c, unsigned offset)
 
 static int chip_direction_output(struct gpio_chip *c, unsigned offset, int val)
 {
-       struct cs5535_gpio_chip *chip =
-               container_of(c, struct cs5535_gpio_chip, chip);
+       struct cs5535_gpio_chip *chip = gpiochip_get_data(c);
        unsigned long flags;
 
        spin_lock_irqsave(&chip->lock, flags);
@@ -347,7 +348,7 @@ static int cs5535_gpio_probe(struct platform_device *pdev)
                                mask_orig, mask);
 
        /* finally, register with the generic GPIO API */
-       err = gpiochip_add(&cs5535_gpio_chip.chip);
+       err = gpiochip_add_data(&cs5535_gpio_chip.chip, &cs5535_gpio_chip);
        if (err)
                goto done;