Commit 696e9ba9 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski
Browse files

gpio: sim: allow to define the active-low setting of a simulated hog 



Add a new configfs attribute to the hog group allowing to configure the
active-low lookup flag for hogged lines. This will allow us to extend
tests to also cover the line config of hogs set up using software nodes.

Reviewed-by: default avatarLinus Walleij <linusw@kernel.org>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260309-gpio-hog-fwnode-v2-6-4e61f3dbf06a@oss.qualcomm.com


Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
parent dea046e7

drivers/gpio/gpio-sim.c

+39 −1
Original line number Diff line number Diff line
@@ -654,6 +654,7 @@ struct gpio_sim_hog { 


	char *name;

	int dir;

	bool active_low;

};



static struct gpio_sim_hog *to_gpio_sim_hog(struct config_item *item)
@@ -836,7 +837,7 @@ static int gpio_sim_bank_add_hogs(struct gpio_sim_bank *bank) 
		hog = line->hog;



		gpios[0] = line->offset;

		gpios[1] = 0;

		gpios[1] = hog->active_low ? 1 : 0;



		memset(properties, 0, sizeof(properties));
@@ -1315,9 +1316,46 @@ gpio_sim_hog_config_direction_store(struct config_item *item, 


CONFIGFS_ATTR(gpio_sim_hog_config_, direction);



static ssize_t gpio_sim_hog_config_active_low_show(struct config_item *item,

						   char *page)

{

	struct gpio_sim_hog *hog = to_gpio_sim_hog(item);

	struct gpio_sim_device *dev = gpio_sim_hog_get_device(hog);



	guard(mutex)(&dev->lock);



	return sprintf(page, "%c\n", hog->active_low ? '1' : '0');

}



static ssize_t

gpio_sim_hog_config_active_low_store(struct config_item *item,

				     const char *page, size_t count)

{

	struct gpio_sim_hog *hog = to_gpio_sim_hog(item);

	struct gpio_sim_device *dev = gpio_sim_hog_get_device(hog);

	bool active_low;

	int ret;



	guard(mutex)(&dev->lock);



	if (gpio_sim_device_is_live(dev))

		return -EBUSY;



	ret = kstrtobool(page, &active_low);

	if (ret)

		return ret;



	hog->active_low = active_low;



	return count;

}



CONFIGFS_ATTR(gpio_sim_hog_config_, active_low);



static struct configfs_attribute *gpio_sim_hog_config_attrs[] = {

	&gpio_sim_hog_config_attr_name,

	&gpio_sim_hog_config_attr_direction,

	&gpio_sim_hog_config_attr_active_low,

	NULL

};