Re: [PATCH 3/4] android/gatt: Add support to read connection RSSI

[Szymon Janc <szymon.janc@gmail.com>]

Hi Andrzej,

Prefix should be android/bluetooth:

On Friday 16 May 2014 17:19:13 Andrzej Kaczmarek wrote:
> ---
>  android/bluetooth.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
> android/bluetooth.h |  5 +++++
>  2 files changed, 55 insertions(+)
> 
> diff --git a/android/bluetooth.c b/android/bluetooth.c
> index 1e760d4..ee33676 100644
> --- a/android/bluetooth.c
> +++ b/android/bluetooth.c
> @@ -3033,6 +3033,56 @@ bool bt_le_discovery_start(bt_le_device_found cb)
>  	return false;
>  }
> 
> +struct read_rssi_user_data {
> +	bt_read_device_rssi_done cb;
> +	void *user_data;
> +};
> +
> +static void read_device_rssi_cb(uint8_t status, uint16_t length,
> +			const void *param, void *user_data)
> +{
> +	const struct mgmt_rp_get_conn_info *rp = param;
> +	struct read_rssi_user_data *data = user_data;
> +
> +	DBG("");
> +
> +	if (status)
> +		error("Failed to get conn info: %s (0x%02x))",
> +						mgmt_errstr(status), status);
> +
> +	data->cb(status, &rp->addr.bdaddr, rp->rssi, data->user_data);

This will crash if kernel doesn't support this command.
Since we will add dependency on required mgmt version eventually, I think it 
should be enough to bail out if size doesn't match.

	if (length < sizeof(*rp)) {
		error("Wrong size of get connection info response");
		return;
	}

> +}
> +
> +bool bt_read_device_rssi(const bdaddr_t *addr, bt_read_device_rssi_done cb,
> +							void *user_data)
> +{
> +	struct device *dev;
> +	struct read_rssi_user_data *data;
> +	struct mgmt_cp_get_conn_info cp;
> +
> +	/* type is used only as fallback when device is not in cache */
> +	dev = get_device(addr, BDADDR_BREDR);

I think we can use find_dev() and fail if none is found, it should be 
connected after in first place.

> +
> +	memcpy(&cp.addr.bdaddr, addr, sizeof(cp.addr.bdaddr));
> +	cp.addr.type = dev->bredr ? BDADDR_BREDR : dev->bdaddr_type;
> +
> +	data = new0(struct read_rssi_user_data, 1);
> +	if (!data)
> +		return false;
> +
> +	data->cb = cb;
> +	data->user_data = user_data;
> +
> +	if (!mgmt_send(mgmt_if, MGMT_OP_GET_CONN_INFO, adapter.index,
> +			sizeof(cp), &cp, read_device_rssi_cb, data, free)) {
> +		free(data);
> +		error("Failed to get conn info");
> +		return false;
> +	}
> +
> +	return true;
> +}
> +
>  static uint8_t set_adapter_scan_mode(const void *buf, uint16_t len)
>  {
>  	const uint8_t *mode = buf;
> diff --git a/android/bluetooth.h b/android/bluetooth.h
> index 3eef7a4..6a3e766 100644
> --- a/android/bluetooth.h
> +++ b/android/bluetooth.h
> @@ -50,3 +50,8 @@ bool bt_le_set_advertising(bool advertising,
> bt_le_set_advertising_done cb, uint8_t bt_get_device_android_type(const
> bdaddr_t *addr);
>  const char *bt_get_adapter_name(void);
>  bool bt_device_is_bonded(const bdaddr_t *bdaddr);
> +
> +typedef void (*bt_read_device_rssi_done)(uint8_t status, const bdaddr_t
> *addr, +						int8_t rssi, void *user_data);
> +bool bt_read_device_rssi(const bdaddr_t *addr, bt_read_device_rssi_done cb,
> +							void *user_data);

-- 
Szymon K. Janc
szymon.janc@gmail.com