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Wysocki" , Marcin Wojtas , Andy Shevchenko , Sinan Kaya , Marcel Holtmann , Johan Hedberg , linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, Balakrishna Godavarthi , Loic Poulain , Brian Norris Subject: Re: [PATCH 1/2] device property: Add device_get_bd_address() and fwnode_get_bd_address() Message-ID: <20180921164058.GW22824@google.com> References: <20180920223436.202454-1-mka@chromium.org> <20180920223436.202454-2-mka@chromium.org> <20180921071312.gg7xshwa2ro3hiix@kekkonen.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20180921071312.gg7xshwa2ro3hiix@kekkonen.localdomain> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sakari, On Fri, Sep 21, 2018 at 10:13:12AM +0300, Sakari Ailus wrote: > Hi Matthias, > > On Thu, Sep 20, 2018 at 03:34:35PM -0700, Matthias Kaehlcke wrote: > > Provide an API for Bluetooth drivers to retrieve the Bluetooth Device > > address (BD_ADDR) for a device. If the device node has a property > > 'local-bd-address' the BD address is read from this property. > > > > Signed-off-by: Matthias Kaehlcke > > --- > > drivers/base/property.c | 49 ++++++++++++++++++++++++++++++++++++++++ > > include/linux/property.h | 4 ++++ > > 2 files changed, 53 insertions(+) > > > > diff --git a/drivers/base/property.c b/drivers/base/property.c > > index 240ab5230ff6..8fe546b9805a 100644 > > --- a/drivers/base/property.c > > +++ b/drivers/base/property.c > > @@ -18,6 +18,8 @@ > > #include > > #include > > > > +#define BD_ADDR_LEN 6 > > + > > struct property_set { > > struct device *dev; > > struct fwnode_handle fwnode; > > @@ -1315,6 +1317,53 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen) > > } > > EXPORT_SYMBOL(device_get_mac_address); > > > > +/** > > + * fwnode_get_bd_address - Get the Bluetooth Device Address (BD_ADDR) from the > > + * firmware node > > + * @fwnode: Pointer to the firmware node > > + * @addr: Address of buffer to store the BD address in > > + * @alen: Length of the buffer pointed to by addr, should be BD_ADDR_LEN > > + * > > + * Search the firmware node for 'local-bd-address'. > > + * > > + * All-zero BD addresses are rejected, because those could be properties > > + * that exist in the firmware tables, but were not updated by the firmware. For > > + * example, the DTS could define 'local-bd-address', with zero BD addresses. > > + */ > > +int fwnode_get_bd_address(struct fwnode_handle *fwnode, u8 *addr, int alen) > > How about using bdaddr_t instead? The original caller was casting it to u8 > probably just because there was no function specifically for this purpose. I was considering that, but wasn't sure if it would be 'correct' to include net/bluetooth/bluetooth.h (with the typdef of bdaddr_t) from property.h since it is very frugal on headers and complex types. That said I'd also prefer to use bdaddr_t if the API isn't limited to basic data types on purpose. > I wonder if this also should be made depend on CONFIG_BT. The fwnode > framework is unconditionally a part of the kernel and it's not very big at > the moment but adding stuff little by little will add up eventually. Sounds good! > > +{ > > + u8 buf[BD_ADDR_LEN]; > > + int ret; > > + > > + if (alen != BD_ADDR_LEN) > > + return -EINVAL; > > + > > + ret = fwnode_property_read_u8_array(fwnode, "local-bd-address", > > + buf, alen); > > + if (ret < 0) > > + return ret; > > + if (is_zero_ether_addr(buf)) > > + return -ENODATA; > > + > > + memcpy(addr, buf, BD_ADDR_LEN); > > + > > + return 0; > > +} > > +EXPORT_SYMBOL(fwnode_get_bd_address); > > + > > +/** > > + * device_get_bd_address - Get the Bluetooth Device Address (BD_ADDR) for a > > + * given device > > + * @dev: Pointer to the device > > + * @addr: Address of buffer to store the BD address in > > + * @alen: Length of the buffer pointed to by addr, should be BD_ADDR_LEN > > + */ > > +int device_get_bd_address(struct device *dev, u8 *addr, int alen) > > +{ > > + return fwnode_get_bd_address(dev_fwnode(dev), addr, alen); > > +} > > +EXPORT_SYMBOL(device_get_bd_address); > > + > > /** > > * fwnode_irq_get - Get IRQ directly from a fwnode > > * @fwnode: Pointer to the firmware node > > diff --git a/include/linux/property.h b/include/linux/property.h > > index ac8a1ebc4c1b..4e2f1b276f4f 100644 > > --- a/include/linux/property.h > > +++ b/include/linux/property.h > > @@ -287,9 +287,13 @@ int device_get_phy_mode(struct device *dev); > > > > void *device_get_mac_address(struct device *dev, char *addr, int alen); > > > > +int device_get_bd_address(struct device *dev, u8 *addr, int alen); > > + > > int fwnode_get_phy_mode(struct fwnode_handle *fwnode); > > void *fwnode_get_mac_address(struct fwnode_handle *fwnode, > > char *addr, int alen); > > +int fwnode_get_bd_address(struct fwnode_handle *fwnode, > > + u8 *addr, int alen); > > This would be a good opportunity to add a newline here, and avoid adding > one after device_get_mac_address(). Will do Thanks for the review!