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ALSA: usb-audio: scarlett2: Improve device info lookup

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Add the USB device ID to the scarlett2_device_info struct so that the
switch statement which finds the appropriate struct can be replaced
with a loop that looks through an array of pointers to those structs.

Suggested-by: Vladimir Sadovnikov <sadko4u@gmail.com>
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/474c408c29fb280a611e47e49e59ca2fb9810d27.1624294591.git.g@b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Geoffrey D. Bennett 2021-06-22 03:39:31 +09:30 committed by Takashi Iwai
parent 76cb680603
commit d92b91576e
1 changed files with 23 additions and 14 deletions
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37
sound/usb/mixer_scarlett_gen2.c
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@ -217,6 +217,7 @@ struct scarlett2_ports {
};
struct scarlett2_device_info {
u32 usb_id; /* USB device identifier */
u8 line_out_hw_vol; /* line out hw volume is sw controlled */
u8 level_input_count; /* inputs with level selectable */
u8 pad_input_count; /* inputs with pad selectable */
@ -257,6 +258,8 @@ struct scarlett2_data {
/*** Model-specific data ***/
static const struct scarlett2_device_info s6i6_gen2_info = {
.usb_id = USB_ID(0x1235, 0x8203),
/* The first two analogue inputs can be switched between line
* and instrument levels.
*/
@ -310,6 +313,8 @@ static const struct scarlett2_device_info s6i6_gen2_info = {
};
static const struct scarlett2_device_info s18i8_gen2_info = {
.usb_id = USB_ID(0x1235, 0x8204),
/* The first two analogue inputs can be switched between line
* and instrument levels.
*/
@ -371,6 +376,8 @@ static const struct scarlett2_device_info s18i8_gen2_info = {
};
static const struct scarlett2_device_info s18i20_gen2_info = {
.usb_id = USB_ID(0x1235, 0x8201),
/* The analogue line outputs on the 18i20 can be switched
* between software and hardware volume control
*/
@ -437,6 +444,16 @@ static const struct scarlett2_device_info s18i20_gen2_info = {
},
};
static const struct scarlett2_device_info *scarlett2_devices[] = {
/* Supported Gen 2 devices */
&s6i6_gen2_info,
&s18i8_gen2_info,
&s18i20_gen2_info,
/* End of list */
NULL
};
/* get the starting port index number for a given port type/direction */
static int scarlett2_get_port_start_num(const struct scarlett2_ports *ports,
int direction, int port_type)
@ -2293,26 +2310,18 @@ static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer,
int snd_scarlett_gen2_init(struct usb_mixer_interface *mixer)
{
struct snd_usb_audio *chip = mixer->chip;
const struct scarlett2_device_info *info;
const struct scarlett2_device_info **info = scarlett2_devices;
int err;
/* only use UAC_VERSION_2 */
if (!mixer->protocol)
return 0;
switch (chip->usb_id) {
case USB_ID(0x1235, 0x8203):
info = &s6i6_gen2_info;
break;
case USB_ID(0x1235, 0x8204):
info = &s18i8_gen2_info;
break;
case USB_ID(0x1235, 0x8201):
info = &s18i20_gen2_info;
break;
default: /* device not (yet) supported */
/* find device in scarlett2_devices */
while (*info && (*info)->usb_id != chip->usb_id)
info++;
if (!*info)
return -EINVAL;
}
if (!(chip->setup & SCARLETT2_ENABLE)) {
usb_audio_info(chip,
@ -2329,7 +2338,7 @@ int snd_scarlett_gen2_init(struct usb_mixer_interface *mixer)
"Focusrite Scarlett Gen 2 Mixer Driver enabled pid=0x%04x",
USB_ID_PRODUCT(chip->usb_id));
err = snd_scarlett_gen2_controls_create(mixer, info);
err = snd_scarlett_gen2_controls_create(mixer, *info);
if (err < 0)
usb_audio_err(mixer->chip,
"Error initialising Scarlett Mixer Driver: %d",