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gpio: sim: implement the dbg_show() callback

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Provide a custom implementation of the dbg_show() callback that prints
all requested lines together with their label, direction, value and
bias. This improves the code coverage of GPIOLIB.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2023-12-04 09:57:19 +01:00
parent 11a94a335a
commit d22f93c6a0
1 changed files with 22 additions and 0 deletions
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22
drivers/gpio/gpio-sim.c
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@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irq_sim.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/minmax.h>
#include <linux/mod_devicetable.h>
@ -28,6 +29,7 @@
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/string_helpers.h>
@ -224,6 +226,25 @@ static void gpio_sim_free(struct gpio_chip *gc, unsigned int offset)
}
}
static void gpio_sim_dbg_show(struct seq_file *seq, struct gpio_chip *gc)
{
struct gpio_sim_chip *chip = gpiochip_get_data(gc);
const char *label;
int i;
guard(mutex)(&chip->lock);
for_each_requested_gpio(gc, i, label)
seq_printf(seq, " gpio-%-3d (%s) %s,%s\n",
gc->base + i,
label,
test_bit(i, chip->direction_map) ? "input" :
test_bit(i, chip->value_map) ? "output-high" :
"output-low",
test_bit(i, chip->pull_map) ? "pull-up" :
"pull-down");
}
static ssize_t gpio_sim_sysfs_val_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -460,6 +481,7 @@ static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev)
gc->to_irq = gpio_sim_to_irq;
gc->request = gpio_sim_request;
gc->free = gpio_sim_free;
gc->dbg_show = PTR_IF(IS_ENABLED(CONFIG_DEBUG_FS), gpio_sim_dbg_show);
gc->can_sleep = true;
ret = devm_gpiochip_add_data(dev, gc, chip);