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NFC: Add firmware upload netlink command

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As several NFC chipsets can have their firmwares upgraded and
reflashed, this patchset adds a new netlink command to trigger
that the driver loads or flashes a new firmware. This will allows
userspace triggered firmware upgrade through netlink.
The firmware name or hint is passed as a parameter, and the driver
will eventually fetch the firmware binary through the request_firmware
API.
The cmd can only be executed when the nfc dev is not in use. Actual
firmware loading/flashing is an asynchronous operation. Result of the
operation shall send a new event up to user space through the nfc dev
multicast socket. During operation, the nfc dev is not openable and
thus not usable.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Eric Lapuyade
2013-04-29 17:13:27 +02:00
committed by Samuel Ortiz
parent 1095e69f47
commit 9674da8759
5 changed files with 122 additions and 0 deletions
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46
net/nfc/core.c
View File

@@ -44,6 +44,47 @@ DEFINE_MUTEX(nfc_devlist_mutex);
/* NFC device ID bitmap */
static DEFINE_IDA(nfc_index_ida);
int nfc_fw_upload(struct nfc_dev *dev, const char *firmware_name)
{
int rc = 0;
pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name);
device_lock(&dev->dev);
if (!device_is_registered(&dev->dev)) {
rc = -ENODEV;
goto error;
}
if (dev->dev_up) {
rc = -EBUSY;
goto error;
}
if (!dev->ops->fw_upload) {
rc = -EOPNOTSUPP;
goto error;
}
dev->fw_upload_in_progress = true;
rc = dev->ops->fw_upload(dev, firmware_name);
if (rc)
dev->fw_upload_in_progress = false;
error:
device_unlock(&dev->dev);
return rc;
}
int nfc_fw_upload_done(struct nfc_dev *dev, const char *firmware_name)
{
dev->fw_upload_in_progress = false;
return nfc_genl_fw_upload_done(dev, firmware_name);
}
EXPORT_SYMBOL(nfc_fw_upload_done);
/**
* nfc_dev_up - turn on the NFC device
*
@@ -69,6 +110,11 @@ int nfc_dev_up(struct nfc_dev *dev)
goto error;
}
if (dev->fw_upload_in_progress) {
rc = -EBUSY;
goto error;
}
if (dev->dev_up) {
rc = -EALREADY;
goto error;