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Subject[PATCH 1/3] platform/chrome: notify: Add driver data struct
Date
Introduce a device driver data structure, cros_usbpd_notify_data, in
which we can store the notifier block object and pointers to the struct
cros_ec_device and struct device objects.

This will make it more convenient to access these pointers when
executing both platform and ACPI callbacks.

While we are here, also add a dev_info print declaring successful device
registration at the end of the platform probe function.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
drivers/platform/chrome/cros_usbpd_notify.c | 30 ++++++++++++++-------
1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
index 3851bbd6e9a39..edcb346024b07 100644
--- a/drivers/platform/chrome/cros_usbpd_notify.c
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -16,6 +16,12 @@

static BLOCKING_NOTIFIER_HEAD(cros_usbpd_notifier_list);

+struct cros_usbpd_notify_data {
+ struct device *dev;
+ struct cros_ec_device *ec;
+ struct notifier_block nb;
+};
+
/**
* cros_usbpd_register_notify - Register a notifier callback for PD events.
* @nb: Notifier block pointer to register
@@ -98,23 +104,28 @@ static int cros_usbpd_notify_probe_plat(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
- struct notifier_block *nb;
+ struct cros_usbpd_notify_data *pdnotify;
int ret;

- nb = devm_kzalloc(dev, sizeof(*nb), GFP_KERNEL);
- if (!nb)
+ pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
+ if (!pdnotify)
return -ENOMEM;

- nb->notifier_call = cros_usbpd_notify_plat;
- dev_set_drvdata(dev, nb);
+ pdnotify->dev = dev;
+ pdnotify->ec = ecdev->ec_dev;
+ pdnotify->nb.notifier_call = cros_usbpd_notify_plat;
+
+ dev_set_drvdata(dev, pdnotify);

ret = blocking_notifier_chain_register(&ecdev->ec_dev->event_notifier,
- nb);
+ &pdnotify->nb);
if (ret < 0) {
dev_err(dev, "Failed to register notifier\n");
return ret;
}

+ dev_info(dev, "Chrome EC PD notify device registered.\n");
+
return 0;
}

@@ -122,10 +133,11 @@ static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
- struct notifier_block *nb =
- (struct notifier_block *)dev_get_drvdata(dev);
+ struct cros_usbpd_notify_data *pdnotify =
+ (struct cros_usbpd_notify_data *)dev_get_drvdata(dev);

- blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier, nb);
+ blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier,
+ &pdnotify->nb);

return 0;
}
--
2.25.1.696.g5e7596f4ac-goog
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