Use attribute-groups to fix race condition.
Signed-off-by: Janne Kanniainen <janne.kanniainen@xxxxxxxxx>
---
.../ABI/testing/sysfs-class-hid-driver-gt683r | 6 +++--
drivers/hid/hid-gt683r.c | 31 +++++++++++++---------
2 files changed, 22 insertions(+), 15 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-class-hid-driver-gt683r b/Documentation/ABI/testing/sysfs-class-hid-driver-gt683r
index 317e9d5..c97970a 100644
--- a/Documentation/ABI/testing/sysfs-class-hid-driver-gt683r
+++ b/Documentation/ABI/testing/sysfs-class-hid-driver-gt683r
@@ -1,9 +1,11 @@
-What: /sys/class/hidraw/<hidraw>/device/leds_mode
+What: /sys/class/leds/<led>/msi_mode
Date: Jun 2014
KernelVersion: 3.17
Contact: Janne Kanniainen <janne.kanniainen@xxxxxxxxx>
Description:
- Set the mode of LEDs
+ Set the mode of LEDs. You should notice that changing the mode
+ of one LED will update the mode of its two sibling devices as
+ well
0 - normal
1 - audio
diff --git a/drivers/hid/hid-gt683r.c b/drivers/hid/hid-gt683r.c
index 073bd80..aba6636 100644
--- a/drivers/hid/hid-gt683r.c
+++ b/drivers/hid/hid-gt683r.c
@@ -84,12 +84,13 @@ static void gt683r_brightness_set(struct led_classdev *led_cdev,
}
}
-static ssize_t leds_mode_show(struct device *dev,
+static ssize_t msi_mode_show(struct device *led_dev,
struct device_attribute *attr,
char *buf)
{
u8 sysfs_mode;
- struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct hid_device *hdev = container_of(led_dev->parent,
+ struct hid_device, dev);
struct gt683r_led *led = hid_get_drvdata(hdev);
if (led->mode == GT683R_LED_NORMAL)
@@ -102,15 +103,15 @@ static ssize_t leds_mode_show(struct device *dev,
return scnprintf(buf, PAGE_SIZE, "%u\n", sysfs_mode);
}
-static ssize_t leds_mode_store(struct device *dev,
+static ssize_t msi_mode_store(struct device *led_dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
u8 sysfs_mode;
- struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct hid_device *hdev = container_of(led_dev->parent,
+ struct hid_device, dev);
struct gt683r_led *led = hid_get_drvdata(hdev);
-
if (kstrtou8(buf, 10, &sysfs_mode) || sysfs_mode > 2)
return -EINVAL;
@@ -212,7 +213,14 @@ fail:
mutex_unlock(&led->lock);
}
-static DEVICE_ATTR_RW(leds_mode);
+static DEVICE_ATTR_RW(msi_mode);
+
+static struct attribute *gt683r_led_attrs[] = {
+ &dev_attr_msi_mode.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(gt683r_led);
static int gt683r_led_probe(struct hid_device *hdev,
const struct hid_device_id *id)
@@ -261,6 +269,8 @@ static int gt683r_led_probe(struct hid_device *hdev,
led->led_devs[i].name = name;
led->led_devs[i].max_brightness = 1;
led->led_devs[i].brightness_set = gt683r_brightness_set;
+ led->led_devs[i].groups = gt683r_led_groups;
+
ret = led_classdev_register(&hdev->dev, &led->led_devs[i]);
if (ret) {
hid_err(hdev, "could not register led device\n");
@@ -268,17 +278,12 @@ static int gt683r_led_probe(struct hid_device *hdev,
}
}
- ret = device_create_file(&led->hdev->dev, &dev_attr_leds_mode);
- if (ret) {
- hid_err(hdev, "could not make mode attribute file\n");
- goto fail;
- }
-
return 0;
fail:
for (i = i - 1; i >= 0; i--)
led_classdev_unregister(&led->led_devs[i]);
+
hid_hw_stop(hdev);
return ret;
}
@@ -288,9 +293,9 @@ static void gt683r_led_remove(struct hid_device *hdev)
int i;
struct gt683r_led *led = hid_get_drvdata(hdev);
- device_remove_file(&hdev->dev, &dev_attr_leds_mode);
for (i = 0; i < GT683R_LED_COUNT; i++)
led_classdev_unregister(&led->led_devs[i]);
+
flush_work(&led->work);
hid_hw_stop(hdev);
}
--
1.9.2
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