@@ -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);
}
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: Bartosz Golaszewski <bgolaszewski@baylibre.com> --- drivers/gpio/gpio-mockup.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+)