Add support for retrieving the mux configuration from the hardware when the driver is initialising. Previously the ALSA controls were initialised to a default hard-coded state instead of being initialised to match the hardware state.

Fixes: 9e4d5c1be21f ("ALSA: usb-audio: Scarlett Gen 2 mixer interface") Suggested-by: Vladimir Sadovnikov sadko4u@gmail.com Tested-by: Markus Schroetter project.m.schroetter@gmail.com Tested-by: Alex Fellows alex.fellows@gmail.com Tested-by: Daniel Sales daniel.sales.z@gmail.com Signed-off-by: Geoffrey D. Bennett g@b4.vu --- sound/usb/mixer_scarlett_gen2.c | 170 ++++++++++++++++++++------------ 1 file changed, 106 insertions(+), 64 deletions(-)

diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index 5969d6bda58d..a461317dc8c6 100644 --- a/sound/usb/mixer_scarlett_gen2.c +++ b/sound/usb/mixer_scarlett_gen2.c @@ -32,6 +32,10 @@ * Scarlett 6i6 support added in June 2019 (thanks to Martin Wittmann * for providing usbmon output and testing). * + * Support for loading mixer volume and mux configuration from the + * interface during driver initialisation added in May 2021 (thanks to + * Vladimir Sadovnikov for figuring out how). + * * This ALSA mixer gives access to: * - input, output, mixer-matrix muxes * - 18x10 mixer-matrix gain stages @@ -228,6 +232,7 @@ struct scarlett2_mixer_data { struct delayed_work work; const struct scarlett2_device_info *info; int num_mux_srcs; + int num_mux_dsts; u16 scarlett2_seq; u8 vol_updated; u8 master_vol; @@ -468,6 +473,7 @@ static int scarlett2_get_port_start_num(const struct scarlett2_ports *ports, #define SCARLETT2_USB_GET_METER_LEVELS 0x00001001 #define SCARLETT2_USB_GET_MIX 0x00002001 #define SCARLETT2_USB_SET_MIX 0x00002002 +#define SCARLETT2_USB_GET_MUX 0x00003001 #define SCARLETT2_USB_SET_MUX 0x00003002 #define SCARLETT2_USB_GET_DATA 0x00800000 #define SCARLETT2_USB_SET_DATA 0x00800001 @@ -877,6 +883,94 @@ static u32 scarlett2_mux_src_num_to_id(const struct scarlett2_ports *ports, return 0; }

+/* Convert a hardware ID to a port number index */ +static u32 scarlett2_mux_id_to_num(const struct scarlett2_ports *ports, + int direction, + u32 id) +{ + int port_type; + int port_num = 0; + + for (port_type = 0; + port_type < SCARLETT2_PORT_TYPE_COUNT; + port_type++) { + struct scarlett2_ports port = ports[port_type]; + int count = port.num[direction]; + + if (id >= port.id && id < port.id + count) + return port_num + id - port.id; + port_num += count; + } + + /* Oops */ + return -1; +} + +/* Convert one mux entry from the interface and load into private->mux[] */ +static void scarlett2_usb_populate_mux(struct scarlett2_mixer_data *private, + u32 mux_entry) +{ + const struct scarlett2_device_info *info = private->info; + const struct scarlett2_ports *ports = info->ports; + + int dst_idx, src_idx; + + dst_idx = scarlett2_mux_id_to_num(ports, SCARLETT2_PORT_OUT, + mux_entry & 0xFFF); + if (dst_idx < 0) + return; + + if (dst_idx >= private->num_mux_dsts) { + usb_audio_err(private->mixer->chip, + "BUG: scarlett2_mux_id_to_num(%06x, OUT): %d >= %d", + mux_entry, dst_idx, private->num_mux_dsts); + return; + } + + src_idx = scarlett2_mux_id_to_num(ports, SCARLETT2_PORT_IN, + mux_entry >> 12); + if (src_idx < 0) + return; + + if (src_idx >= private->num_mux_srcs) { + usb_audio_err(private->mixer->chip, + "BUG: scarlett2_mux_id_to_num(%06x, IN): %d >= %d", + mux_entry, src_idx, private->num_mux_srcs); + return; + } + + private->mux[dst_idx] = src_idx; +} + +/* Send USB message to get mux inputs and then populate private->mux[] */ +static int scarlett2_usb_get_mux(struct usb_mixer_interface *mixer) +{ + struct scarlett2_mixer_data *private = mixer->private_data; + int count = private->num_mux_dsts; + int err, i; + + struct { + __le16 num; + __le16 count; + } __packed req; + + __le32 data[SCARLETT2_MUX_MAX]; + + req.num = 0; + req.count = cpu_to_le16(count); + + err = scarlett2_usb(mixer, SCARLETT2_USB_GET_MUX, + &req, sizeof(req), + data, count * sizeof(u32)); + if (err < 0) + return err; + + for (i = 0; i < count; i++) + scarlett2_usb_populate_mux(private, le32_to_cpu(data[i])); + + return 0; +} + /* Send USB messages to set mux inputs */ static int scarlett2_usb_set_mux(struct usb_mixer_interface *mixer) { @@ -1783,72 +1877,23 @@ static void scarlett2_private_suspend(struct usb_mixer_interface *mixer)

/*** Initialisation ***/

-static int scarlett2_count_mux_srcs(const struct scarlett2_ports *ports) +static void scarlett2_count_mux_io(struct scarlett2_mixer_data *private) { - int port_type, count = 0; + const struct scarlett2_ports *ports = private->info->ports; + int port_type, srcs = 0, dsts = 0;

for (port_type = 0; port_type < SCARLETT2_PORT_TYPE_COUNT; - port_type++) - count += ports[port_type].num[SCARLETT2_PORT_IN]; - - return count; -} - -/* Default routing connects PCM outputs and inputs to Analogue, - * S/PDIF, then ADAT - */ -static void scarlett2_init_routing(u8 *mux, - const struct scarlett2_ports *ports) -{ - int i, input_num, input_count, port_type; - int output_num, output_count, port_type_connect_num; - - static const int connect_order[] = { - SCARLETT2_PORT_TYPE_ANALOGUE, - SCARLETT2_PORT_TYPE_SPDIF, - SCARLETT2_PORT_TYPE_ADAT, - -1 - }; - - /* Assign PCM inputs (routing outputs) */ - output_num = scarlett2_get_port_start_num(ports, - SCARLETT2_PORT_OUT, - SCARLETT2_PORT_TYPE_PCM); - output_count = ports[SCARLETT2_PORT_TYPE_PCM].num[SCARLETT2_PORT_OUT]; - - for (port_type = connect_order[port_type_connect_num = 0]; - port_type >= 0; - port_type = connect_order[++port_type_connect_num]) { - input_num = scarlett2_get_port_start_num( - ports, SCARLETT2_PORT_IN, port_type); - input_count = ports[port_type].num[SCARLETT2_PORT_IN]; - for (i = 0; - i < input_count && output_count; - i++, output_count--) - mux[output_num++] = input_num++; + port_type++) { + srcs += ports[port_type].num[SCARLETT2_PORT_IN]; + dsts += ports[port_type].num[SCARLETT2_PORT_OUT_44]; }

- /* Assign PCM outputs (routing inputs) */ - input_num = scarlett2_get_port_start_num(ports, - SCARLETT2_PORT_IN, - SCARLETT2_PORT_TYPE_PCM); - input_count = ports[SCARLETT2_PORT_TYPE_PCM].num[SCARLETT2_PORT_IN]; - - for (port_type = connect_order[port_type_connect_num = 0]; - port_type >= 0; - port_type = connect_order[++port_type_connect_num]) { - output_num = scarlett2_get_port_start_num( - ports, SCARLETT2_PORT_OUT, port_type); - output_count = ports[port_type].num[SCARLETT2_PORT_OUT]; - for (i = 0; - i < output_count && input_count; - i++, input_count--) - mux[output_num++] = input_num++; - } + private->num_mux_srcs = srcs; + private->num_mux_dsts = dsts; }

-/* Initialise private data, routing, sequence number */ +/* Initialise private data and sequence number */ static int scarlett2_init_private(struct usb_mixer_interface *mixer, const struct scarlett2_device_info *info) { @@ -1862,16 +1907,13 @@ static int scarlett2_init_private(struct usb_mixer_interface *mixer, mutex_init(&private->data_mutex); INIT_DELAYED_WORK(&private->work, scarlett2_config_save_work); private->info = info; - private->num_mux_srcs = scarlett2_count_mux_srcs(info->ports); + scarlett2_count_mux_io(private); private->scarlett2_seq = 0; private->mixer = mixer; mixer->private_data = private; mixer->private_free = scarlett2_private_free; mixer->private_suspend = scarlett2_private_suspend;

- /* Setup default routing */ - scarlett2_init_routing(private->mux, info->ports); - /* Initialise the sequence number used for the proprietary commands */ return scarlett2_usb(mixer, SCARLETT2_USB_INIT_SEQ, NULL, 0, NULL, 0); } @@ -1947,7 +1989,7 @@ static int scarlett2_read_configs(struct usb_mixer_interface *mixer) return err; }

- return 0; + return scarlett2_usb_get_mux(mixer); }

/* Notify on volume change */ @@ -2055,7 +2097,7 @@ static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer, { int err;

- /* Initialise private data, routing, sequence number */ + /* Initialise private data and sequence number */ err = scarlett2_init_private(mixer, info); if (err < 0) return err;