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Commit 8a68ea00 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Linus Walleij
Browse files

gpio: mockup: implement naming the lines 



In order to allow testing line lookup by name from user space, add
a new boolean parameter that indicates whether we want the lines to
be named. The name is created by concatenating the chip name and the
line offset value.

Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent e4ba07bf

drivers/gpio/gpio-mockup.c

+35 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/module.h>

#include <linux/gpio/driver.h>

#include <linux/platform_device.h>

#include <linux/slab.h>



#define GPIO_MOCKUP_NAME	"gpio-mockup"

#define	GPIO_MOCKUP_MAX_GC	10
@@ -43,6 +44,10 @@ static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_GC << 1]; 
static int gpio_mockup_params_nr;

module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);



static bool gpio_mockup_named_lines;

module_param_named(gpio_mockup_named_lines,

		   gpio_mockup_named_lines, bool, 0400);



static const char gpio_mockup_name_start = 'A';



static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
@@ -87,11 +92,35 @@ static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset) 
	return chip->lines[offset].dir;

}



static int gpio_mockup_name_lines(struct device *dev,

				  struct gpio_mockup_chip *chip)

{

	struct gpio_chip *gc = &chip->gc;

	char **names;

	int i;



	names = devm_kzalloc(dev, sizeof(char *) * gc->ngpio, GFP_KERNEL);

	if (!names)

		return -ENOMEM;



	for (i = 0; i < gc->ngpio; i++) {

		names[i] = devm_kasprintf(dev, GFP_KERNEL,

					  "%s-%d", gc->label, i);

		if (!names[i])

			return -ENOMEM;

	}



	gc->names = (const char *const *)names;



	return 0;

}



static int gpio_mockup_add(struct device *dev,

			   struct gpio_mockup_chip *chip,

			   const char *name, int base, int ngpio)

{

	struct gpio_chip *gc = &chip->gc;

	int ret;



	gc->base = base;

	gc->ngpio = ngpio;
@@ -109,6 +138,12 @@ static int gpio_mockup_add(struct device *dev, 
	if (!chip->lines)

		return -ENOMEM;



	if (gpio_mockup_named_lines) {

		ret = gpio_mockup_name_lines(dev, chip);

		if (ret)

			return ret;

	}



	return devm_gpiochip_add_data(dev, &chip->gc, chip);

}