[PATCH v4 10/12] gpio: aggregator: add possibility to attach data to the forwarder

[Thomas Richard]

Add a data pointer to store private data in the forwarder.

Signed-off-by: Thomas Richard <thomas.rich...@bootlin.com>
---
 drivers/gpio/gpio-aggregator.c | 20 ++++++++++++++++++--
 include/linux/gpio/forwarder.h |  4 +++-
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index 230bd8398119..1a6483fc817c 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -268,6 +268,7 @@ struct gpiochip_fwd {
                spinlock_t slock;       /* protects tmp[] if !can_sleep */
        };
        struct gpiochip_fwd_timing *delay_timings;
+       void *data;
        unsigned long *valid_mask;
        unsigned long tmp[];            /* values and descs for multiple ops */
 };
@@ -289,6 +290,18 @@ struct gpio_chip *gpio_fwd_get_gpiochip(struct 
gpiochip_fwd *fwd)
 }
 EXPORT_SYMBOL_NS_GPL(gpio_fwd_get_gpiochip, "GPIO_FORWARDER");
 
+/**
+ * gpio_fwd_get_data - Get data for the GPIO forwarder
+ * @fwd: GPIO forwarder
+ *
+ * Returns: The data for the GPIO forwarder
+ */
+void *gpio_fwd_get_data(struct gpiochip_fwd *fwd)
+{
+       return fwd->data;
+}
+EXPORT_SYMBOL_NS_GPL(gpio_fwd_get_data, "GPIO_FORWARDER");
+
 /**
  * gpio_fwd_request - Request a line of the GPIO forwarder
  * @chip: GPIO chip in the forwarder
@@ -716,10 +729,11 @@ EXPORT_SYMBOL_NS_GPL(gpio_fwd_gpio_free, 
"GPIO_FORWARDER");
 /**
  * gpio_fwd_register - Register a GPIO forwarder
  * @fwd: GPIO forwarder
+ * @data: driver-private data associated with this forwarder
  *
  * Returns: 0 on success, or negative errno on failure.
  */
-int gpio_fwd_register(struct gpiochip_fwd *fwd)
+int gpio_fwd_register(struct gpiochip_fwd *fwd, void *data)
 {
        struct gpio_chip *chip = &fwd->chip;
 
@@ -735,6 +749,8 @@ int gpio_fwd_register(struct gpiochip_fwd *fwd)
        else
                spin_lock_init(&fwd->slock);
 
+       fwd->data = data;
+
        return devm_gpiochip_add_data(chip->parent, chip, fwd);
 }
 EXPORT_SYMBOL_NS_GPL(gpio_fwd_register, "GPIO_FORWARDER");
@@ -779,7 +795,7 @@ static struct gpiochip_fwd *gpio_fwd_create(struct device 
*dev,
                        return ERR_PTR(error);
        }
 
-       error = gpio_fwd_register(fwd);
+       error = gpio_fwd_register(fwd, NULL);
        if (error)
                return ERR_PTR(error);
 
diff --git a/include/linux/gpio/forwarder.h b/include/linux/gpio/forwarder.h
index f0deb7573f36..9bb62a1a6224 100644
--- a/include/linux/gpio/forwarder.h
+++ b/include/linux/gpio/forwarder.h
@@ -12,6 +12,8 @@ struct gpiochip_fwd;
 
 struct gpio_chip *gpio_fwd_get_gpiochip(struct gpiochip_fwd *fwd);
 
+void *gpio_fwd_get_data(struct gpiochip_fwd *fwd);
+
 int gpio_fwd_request(struct gpio_chip *chip, unsigned int offset);
 
 int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset);
@@ -44,6 +46,6 @@ int gpio_fwd_gpio_add(struct gpiochip_fwd *fwd,
 
 void gpio_fwd_gpio_free(struct gpiochip_fwd *fwd, unsigned int offset);
 
-int gpio_fwd_register(struct gpiochip_fwd *fwd);
+int gpio_fwd_register(struct gpiochip_fwd *fwd, void *data);
 
 #endif

-- 
2.39.5