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Bennett" To: alsa-devel@alsa-project.org, Takashi Iwai Subject: [PATCH 02/31] ALSA: usb-audio: scarlett2: Update initialisation sequence Message-ID: <6e5c4fedb74b813872f6a4b7fba30b6c471fa63a.1624294591.git.g@b4.vu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Cc: Hin-Tak Leung , Vladimir Sadovnikov X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" The old initialisation code only works with Gen 2 devices. Replace it with an initialisation sequence that works on both Gen 2 and Gen 3 devices. Signed-off-by: Geoffrey D. Bennett --- sound/usb/mixer_scarlett_gen2.c | 56 ++++++++++++++++++++++++++------- 1 file changed, 45 insertions(+), 11 deletions(-) diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index 6b77582d8e3d..ed89e28548c8 100644 --- a/sound/usb/mixer_scarlett_gen2.c +++ b/sound/usb/mixer_scarlett_gen2.c @@ -453,10 +453,12 @@ static int scarlett2_get_port_start_num(const struct scarlett2_ports *ports, #define SCARLETT2_USB_NOTIFY_MONITOR 0x00400000 /* Commands for sending/receiving requests/responses */ +#define SCARLETT2_USB_CMD_INIT 0 #define SCARLETT2_USB_CMD_REQ 2 #define SCARLETT2_USB_CMD_RESP 3 -#define SCARLETT2_USB_INIT_SEQ 0x00000000 +#define SCARLETT2_USB_INIT_1 0x00000000 +#define SCARLETT2_USB_INIT_2 0x00000002 #define SCARLETT2_USB_GET_METER 0x00001001 #define SCARLETT2_USB_GET_MIX 0x00002001 #define SCARLETT2_USB_SET_MIX 0x00002002 @@ -650,14 +652,19 @@ static int scarlett2_usb( if (err != resp_buf_size) { usb_audio_err( mixer->chip, - "Scarlett Gen 2 USB response result cmd %x was %d\n", - cmd, err); + "Scarlett Gen 2 USB response result cmd %x was %d " + "expected %d\n", + cmd, err, resp_buf_size); err = -EINVAL; goto unlock; } + /* cmd/seq/size should match except when initialising + * seq sent = 1, response = 0 + */ if (resp->cmd != req->cmd || - resp->seq != req->seq || + (resp->seq != req->seq && + (le16_to_cpu(req->seq) != 1 || resp->seq != 0)) || resp_size != le16_to_cpu(resp->size) || resp->error || resp->pad) { @@ -675,7 +682,7 @@ static int scarlett2_usb( goto unlock; } - if (resp_size > 0) + if (resp_data && resp_size > 0) memcpy(resp_data, resp->data, resp_size); unlock: @@ -1924,13 +1931,12 @@ static int scarlett2_find_fc_interface(struct usb_device *dev, return -EINVAL; } -/* Initialise private data, sequence number, and get the USB data */ +/* Initialise private data */ static int scarlett2_init_private(struct usb_mixer_interface *mixer, const struct scarlett2_device_info *info) { struct scarlett2_data *private = kzalloc(sizeof(struct scarlett2_data), GFP_KERNEL); - int err; if (!private) return -ENOMEM; @@ -1948,12 +1954,35 @@ static int scarlett2_init_private(struct usb_mixer_interface *mixer, private->scarlett2_seq = 0; private->mixer = mixer; - err = scarlett2_find_fc_interface(mixer->chip->dev, private); + return scarlett2_find_fc_interface(mixer->chip->dev, private); +} + +/* Cargo cult proprietary initialisation sequence */ +static int scarlett2_usb_init(struct usb_mixer_interface *mixer) +{ + struct usb_device *dev = mixer->chip->dev; + struct scarlett2_data *private = mixer->private_data; + u8 buf[24]; + int err; + + if (usb_pipe_type_check(dev, usb_sndctrlpipe(dev, 0))) + return -EINVAL; + + /* step 0 */ + err = scarlett2_usb_rx(dev, private->bInterfaceNumber, + SCARLETT2_USB_CMD_INIT, buf, sizeof(buf)); if (err < 0) return err; - /* Initialise the sequence number used for the proprietary commands */ - return scarlett2_usb(mixer, SCARLETT2_USB_INIT_SEQ, NULL, 0, NULL, 0); + /* step 1 */ + private->scarlett2_seq = 1; + err = scarlett2_usb(mixer, SCARLETT2_USB_INIT_1, NULL, 0, NULL, 0); + if (err < 0) + return err; + + /* step 2 */ + private->scarlett2_seq = 1; + return scarlett2_usb(mixer, SCARLETT2_USB_INIT_2, NULL, 0, NULL, 84); } /* Read configuration from the interface on start */ @@ -2128,11 +2157,16 @@ static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer, { int err; - /* Initialise private data, sequence number, and get the USB data */ + /* Initialise private data */ err = scarlett2_init_private(mixer, info); if (err < 0) return err; + /* Send proprietary USB initialisation sequence */ + err = scarlett2_usb_init(mixer); + if (err < 0) + return err; + /* Read volume levels and controls from the interface */ err = scarlett2_read_configs(mixer); if (err < 0) -- 2.31.1