Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Linus Walleij <linusw@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260309-gpio-hog-fwnode-v2-6-4e61f3dbf06a@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+39
-1
+39
-1
drivers/gpio/gpio-sim.c
+39
-1
drivers/gpio/gpio-sim.c
···
654
654
655
655
char *name;
656
656
int dir;
657
+
bool active_low;
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658
};
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static struct gpio_sim_hog *to_gpio_sim_hog(struct config_item *item)
···
837
836
hog = line->hog;
838
837
839
838
gpios[0] = line->offset;
840
-
gpios[1] = 0;
839
+
gpios[1] = hog->active_low ? 1 : 0;
841
840
842
841
memset(properties, 0, sizeof(properties));
843
842
···
1316
1315
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CONFIGFS_ATTR(gpio_sim_hog_config_, direction);
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1318
+
static ssize_t gpio_sim_hog_config_active_low_show(struct config_item *item,
1319
+
char *page)
1320
+
{
1321
+
struct gpio_sim_hog *hog = to_gpio_sim_hog(item);
1322
+
struct gpio_sim_device *dev = gpio_sim_hog_get_device(hog);
1323
+
1324
+
guard(mutex)(&dev->lock);
1325
+
1326
+
return sprintf(page, "%c\n", hog->active_low ? '1' : '0');
1327
+
}
1328
+
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+
static ssize_t
1330
+
gpio_sim_hog_config_active_low_store(struct config_item *item,
1331
+
const char *page, size_t count)
1332
+
{
1333
+
struct gpio_sim_hog *hog = to_gpio_sim_hog(item);
1334
+
struct gpio_sim_device *dev = gpio_sim_hog_get_device(hog);
1335
+
bool active_low;
1336
+
int ret;
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+
1338
+
guard(mutex)(&dev->lock);
1339
+
1340
+
if (gpio_sim_device_is_live(dev))
1341
+
return -EBUSY;
1342
+
1343
+
ret = kstrtobool(page, &active_low);
1344
+
if (ret)
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+
return ret;
1346
+
1347
+
hog->active_low = active_low;
1348
+
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+
return count;
1350
+
}
1351
+
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+
CONFIGFS_ATTR(gpio_sim_hog_config_, active_low);
1353
+
1319
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static struct configfs_attribute *gpio_sim_hog_config_attrs[] = {
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1355
&gpio_sim_hog_config_attr_name,
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1356
&gpio_sim_hog_config_attr_direction,
1357
+
&gpio_sim_hog_config_attr_active_low,
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1358
NULL
1323
1359
};
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1360