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ALSA: scarlett2: Add support for reading firmware version

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The 84 bytes read during initialisation step 2 were previously
ignored. This patch retrieves the firmware version from bytes 8-11,
stores it in the scarlett2_data struct, and makes it available
through a new control "Firmware Version".

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/e76cd80c3445769e60c95df12c4635fc8abfe5c7.1698342632.git.g@b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Geoffrey D. Bennett 2023-10-27 04:35:46 +10:30 committed by Takashi Iwai
parent f3c42a2da4
commit 701949cc01
1 changed files with 59 additions and 3 deletions
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62
sound/usb/mixer_scarlett2.c
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@ -406,6 +406,7 @@ struct scarlett2_data {
__u8 bInterval;
int num_mux_srcs;
int num_mux_dsts;
u32 firmware_version;
u16 scarlett2_seq;
u8 sync_updated;
u8 vol_updated;
@ -1856,6 +1857,44 @@ static int scarlett2_add_new_ctl(struct usb_mixer_interface *mixer,
return 0;
}
/*** Firmware Version Control ***/
static int scarlett2_firmware_version_ctl_get(
struct snd_kcontrol *kctl,
struct snd_ctl_elem_value *ucontrol)
{
struct usb_mixer_elem_info *elem = kctl->private_data;
struct scarlett2_data *private = elem->head.mixer->private_data;
ucontrol->value.integer.value[0] = private->firmware_version;
return 0;
}
static int scarlett2_firmware_version_ctl_info(
struct snd_kcontrol *kctl,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
return 0;
}
static const struct snd_kcontrol_new scarlett2_firmware_version_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_CARD,
.access = SNDRV_CTL_ELEM_ACCESS_READ,
.name = "",
.info = scarlett2_firmware_version_ctl_info,
.get = scarlett2_firmware_version_ctl_get
};
static int scarlett2_add_firmware_version_ctl(
struct usb_mixer_interface *mixer)
{
return scarlett2_add_new_ctl(mixer, &scarlett2_firmware_version_ctl,
0, 0, "Firmware Version", NULL);
}
/*** Sync Control ***/
/* Update sync control after receiving notification that the status
@ -3854,7 +3893,8 @@ 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];
u8 step0_buf[24];
u8 step2_buf[84];
int err;
if (usb_pipe_type_check(dev, usb_sndctrlpipe(dev, 0)))
@ -3862,7 +3902,8 @@ static int scarlett2_usb_init(struct usb_mixer_interface *mixer)
/* step 0 */
err = scarlett2_usb_rx(dev, private->bInterfaceNumber,
SCARLETT2_USB_CMD_INIT, buf, sizeof(buf));
SCARLETT2_USB_CMD_INIT,
step0_buf, sizeof(step0_buf));
if (err < 0)
return err;
@ -3874,7 +3915,19 @@ static int scarlett2_usb_init(struct usb_mixer_interface *mixer)
/* step 2 */
private->scarlett2_seq = 1;
return scarlett2_usb(mixer, SCARLETT2_USB_INIT_2, NULL, 0, NULL, 84);
err = scarlett2_usb(mixer, SCARLETT2_USB_INIT_2,
NULL, 0,
step2_buf, sizeof(step2_buf));
if (err < 0)
return err;
/* extract 4-byte firmware version from step2_buf[8] */
private->firmware_version = le32_to_cpu(*(__le32 *)(step2_buf + 8));
usb_audio_info(mixer->chip,
"Firmware version %d\n",
private->firmware_version);
return 0;
}
/* Read configuration from the interface on start */
@ -4192,6 +4245,9 @@ static int snd_scarlett2_controls_create(
if (err < 0)
return err;
/* Add firmware version control */
err = scarlett2_add_firmware_version_ctl(mixer);
/* Read volume levels and controls from the interface */
err = scarlett2_read_configs(mixer);
if (err < 0)