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Date: Wed, 25 Jan 2017 16:34:19 +0100
From: Bartosz Golaszewski <bgolaszewski@...libre.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 5/7] gpio: mockup: implement injecting events over debugfs
When probing gpio-mockup, create a debugfs directory structure that
allows the user to inject line events by writing either 0
(falling-edge) or 1 (rising-edge) to debugfs files.
The gpio-mockup-event directory has one sub-directory per chip and
a single event file per line.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
drivers/gpio/gpio-mockup.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index cf8b1b2..c5eb530 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -15,6 +15,10 @@
#include <linux/module.h>
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+#include "gpiolib.h"
#define GPIO_NAME "gpio-mockup"
#define MAX_GC 10
@@ -37,6 +41,7 @@ struct gpio_pin_status {
struct mockup_gpio_controller {
struct gpio_chip gc;
struct gpio_pin_status *stats;
+ struct dentry *dbg_dir;
};
static int gpio_mockup_ranges[MAX_GC << 1];
@@ -44,6 +49,7 @@ static int gpio_mockup_params_nr;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
static const char pins_name_start = 'A';
+static struct dentry *dbg_dir;
static int mockup_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
@@ -85,6 +91,80 @@ static int mockup_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
return cntr->stats[offset].dir;
}
+static ssize_t mockup_gpio_event_write(struct file *file,
+ const char __user *usr_buf,
+ size_t size, loff_t *ppos)
+{
+ struct gpio_desc *desc;
+ struct seq_file *sfile;
+ int status, val;
+ char buf;
+
+ sfile = file->private_data;
+ desc = sfile->private;
+
+ status = copy_from_user(&buf, usr_buf, 1);
+ if (status)
+ return status;
+
+ if (buf == '0')
+ val = 0;
+ else if (buf == '1')
+ val = 1;
+ else
+ return -EINVAL;
+
+ gpiod_set_value_cansleep(desc, val);
+ gpiod_inject_event(desc);
+
+ return size;
+}
+
+static int mockup_gpio_event_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, NULL, inode->i_private);
+}
+
+static const struct file_operations mockup_gpio_event_ops = {
+ .owner = THIS_MODULE,
+ .open = mockup_gpio_event_open,
+ .write = mockup_gpio_event_write,
+ .llseek = no_llseek,
+};
+
+static void mockup_gpio_debugfs_setup(struct mockup_gpio_controller *cntr)
+{
+ struct dentry *evfile;
+ struct gpio_chip *gc;
+ struct device *dev;
+ char *name;
+ int i;
+
+ gc = &cntr->gc;
+ dev = &gc->gpiodev->dev;
+
+ cntr->dbg_dir = debugfs_create_dir(gc->label, dbg_dir);
+ if (!cntr->dbg_dir)
+ goto err;
+
+ for (i = 0; i < gc->ngpio; i++) {
+ name = devm_kasprintf(dev, GFP_KERNEL, "%d", i);
+ if (!name)
+ goto err;
+
+ evfile = debugfs_create_file(name, 0200, cntr->dbg_dir,
+ &gc->gpiodev->descs[i],
+ &mockup_gpio_event_ops);
+ if (!evfile)
+ goto err;
+ }
+
+ return;
+
+err:
+ dev_err(dev, "error creating debugfs directory\n");
+}
+
static int mockup_gpio_add(struct device *dev,
struct mockup_gpio_controller *cntr,
const char *name, int base, int ngpio)
@@ -112,6 +192,9 @@ static int mockup_gpio_add(struct device *dev,
if (ret)
goto err;
+ if (dbg_dir)
+ mockup_gpio_debugfs_setup(cntr);
+
dev_info(dev, "gpio<%d..%d> add successful!", base, base + ngpio);
return 0;
err:
@@ -182,6 +265,10 @@ static int __init mock_device_init(void)
{
int err;
+ dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
+ if (!dbg_dir)
+ pr_err("%s: error creating debugfs directory\n", GPIO_NAME);
+
pdev = platform_device_alloc(GPIO_NAME, -1);
if (!pdev)
return -ENOMEM;
@@ -203,6 +290,7 @@ static int __init mock_device_init(void)
static void __exit mock_device_exit(void)
{
+ debugfs_remove_recursive(dbg_dir);
platform_driver_unregister(&mockup_gpio_driver);
platform_device_unregister(pdev);
}
--
2.9.3
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