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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2017-02-06 13:10:37 +0100
committerLinus Walleij <linus.walleij@linaro.org>2017-02-06 14:22:11 +0100
commit8a68ea00a62e7ec33e9e4e7f3d9c2a845943c58d (patch)
treef5e1bdce38a311f540f9d3c5052a708a21d668a2 /drivers/gpio
parente4ba07bf8d1481e440d1f49652c96567f9560fdc (diff)
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: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-mockup.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index d42560113c1b..0ce9acc3550e 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -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);
}