[PATCH -next v3 13/15] hwmon: (nzxt-kraken2) Use devm_hid_hw_start_and_open in kraken2_probe()

Li Zetao
2024-09-10T15:36:59Z

Currently, the nzxt-kraken2 module needs to maintain hid resources
by itself. Use devm_hid_hw_start_and_open helper to ensure that hid
resources are consistent with the device life cycle, and release
hid resources before device is released. At the same time, it can avoid
the goto-release encoding, drop the fail_and_close and fail_and_stop
lables, and directly return the error code when an error occurs.

Further optimization, use devm_hwmon_device_register_with_info to replace
hwmon_device_register_with_info, the remote operation can be completely
deleted, and the kraken2_priv_data no longer needs to hold hwmon device.

Acked-by: Jonas Malaco <jonas@protocubo.io>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Li Zetao <lizetao1@huawei.com>
---
v2 -> v3: None
v2: https://lore.kernel.org/all/20240909012313.500341-14-lizetao1@huawei.com/
v1 -> v2:
1) Further optimize using devm_hwmon_device_register_with_info
and remove the .remove operation
2) Adjust commit information
v1: https://lore.kernel.org/all/20240904123607.3407364-18-lizetao1@huawei.com/

drivers/hwmon/nzxt-kraken2.c | 45 ++++++------------------------------
1 file changed, 7 insertions(+), 38 deletions(-)

diff --git a/drivers/hwmon/nzxt-kraken2.c b/drivers/hwmon/nzxt-kraken2.c
index 7caf387eb144..5b618fc2c17f 100644
--- a/drivers/hwmon/nzxt-kraken2.c
+++ b/drivers/hwmon/nzxt-kraken2.c
@@ -29,7 +29,6 @@ static const char *const kraken2_fan_label[] = {

struct kraken2_priv_data {
struct hid_device *hid_dev;
- struct device *hwmon_dev;
s32 temp_input[1];
u16 fan_input[2];
unsigned long updated; /* jiffies */
@@ -133,6 +132,7 @@ static int kraken2_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct kraken2_priv_data *priv;
+ struct device *hwmon_dev;
int ret;

priv = devm_kzalloc(&hdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -158,44 +158,14 @@ static int kraken2_probe(struct hid_device *hdev,
/*
* Enable hidraw so existing user-space tools can continue to work.
*/
- ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
- if (ret) {
- hid_err(hdev, "hid hw start failed with %d\n", ret);
+ ret = devm_hid_hw_start_and_open(hdev, HID_CONNECT_HIDRAW);
+ if (ret)
return ret;
- }
-
- ret = hid_hw_open(hdev);
- if (ret) {
- hid_err(hdev, "hid hw open failed with %d\n", ret);
- goto fail_and_stop;
- }
-
- priv->hwmon_dev = hwmon_device_register_with_info(&hdev->dev, "kraken2",
- priv, &kraken2_chip_info,
- NULL);
- if (IS_ERR(priv->hwmon_dev)) {
- ret = PTR_ERR(priv->hwmon_dev);
- hid_err(hdev, "hwmon registration failed with %d\n", ret);
- goto fail_and_close;
- }
-
- return 0;
-
-fail_and_close:
- hid_hw_close(hdev);
-fail_and_stop:
- hid_hw_stop(hdev);
- return ret;
-}
-
-static void kraken2_remove(struct hid_device *hdev)
-{
- struct kraken2_priv_data *priv = hid_get_drvdata(hdev);
-
- hwmon_device_unregister(priv->hwmon_dev);

- hid_hw_close(hdev);
- hid_hw_stop(hdev);
+ hwmon_dev = devm_hwmon_device_register_with_info(&hdev->dev, "kraken2",
+ priv, &kraken2_chip_info,
+ NULL);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
}

static const struct hid_device_id kraken2_table[] = {
@@ -209,7 +179,6 @@ static struct hid_driver kraken2_driver = {
.name = "nzxt-kraken2",
.id_table = kraken2_table,
.probe = kraken2_probe,
- .remove = kraken2_remove,
.raw_event = kraken2_raw_event,
};

--
2.34.1