Add Clarett support

README.md

@@ -7,24 +7,25 @@ the Linux kernel Focusrite Scarlett Gen 2/3 Mixer Driver.
 
 <img src="src/img/alsa-scarlett-gui-logo.png" align="right">
 
-The Focusrite Scarlett interfaces are class compliant USB audio
-interfaces meaning that they work “out of the box” on Linux as audio
-and MIDI interfaces (although on Gen 3 you need to disable MSD mode
-first). However, the Gen 2 6i6+ and Gen 3 4i4+ interfaces have a bunch
-of proprietary functionality that required a kernel driver to be
-written specifically for those devices.
+The Focusrite Scarlett (and Clarett+) interfaces are class compliant
+USB audio interfaces meaning that they work “out of the box” on Linux
+as audio and MIDI interfaces (although on Gen 3 you need to disable
+MSD mode first). However, the Gen 2 6i6+, Gen 3 4i4+, and Clarett+
+interfaces have a bunch of proprietary functionality that required a
+kernel driver to be written specifically for those devices.
 
 Linux kernel support (“ALSA Focusrite Scarlett Gen 2/3 Mixer Driver”)
 for the proprietary functionality of Gen 2 devices was first added in
-5.4 and Gen 3 devices in 5.14.
+5.4, Gen 3 devices in 5.14, and Clarett+ 8Pre is coming in 6.1.
 
-Unfortunately, actually using this functionality was quite awful. The
-existing applications like `alsamixer` and `qasmixer` become
-completely user-hostile with the hundreds of controls presented for
-the Gen 3 18i20. Even the smallest Gen 3 4i4 interface at last count
-had 84 ALSA controls.
+Unfortunately, actually using this functionality used to be quite an
+awful experience. The existing applications like `alsamixer` and
+`qasmixer` become completely user-hostile with the hundreds of
+controls presented for the Gen 3 18i20. Even the smallest Gen 3 4i4
+interface at last count had 84 ALSA controls.
 
-Announcing the ALSA Scarlett Gen 2/3 Control Panel!
+Announcing the ALSA Scarlett Gen 2/3 (and Clarett+ 8Pre!) Control
+Panel!
 
 ![Demonstration](img/demo.gif)
 

USAGE.md

@@ -4,20 +4,22 @@
 
 Linux Kernel with the ALSA Scarlett Gen 2/3 mixer driver. Use at least
 version 5.14 for Scarlett Gen 3 support and bug fixes for the Gen 2
-support.
+support. For Clarett+ 8Pre support, wait for 6.1 or see
+https://github.com/geoffreybennett/scarlett-gen2/commits/scarlett-gen3
+for kernel patches.
 
-As of Linux 5.17, the driver is still disabled by default and needs to
+As of Linux 6.0, the driver is still disabled by default and needs to
 be enabled at module load time with the `device_setup=1` option to
 insmod/modprobe. Create a file /etc/modprobe.d/scarlett.conf
 containing the appropriate line for your device:
 
-Gen 2:
+Scarlett Gen 2:
 
 - 6i6: `options snd_usb_audio vid=0x1235 pid=0x8203 device_setup=1`
 - 18i8: `options snd_usb_audio vid=0x1235 pid=0x8204 device_setup=1`
 - 18i20: `options snd_usb_audio vid=0x1235 pid=0x8201 device_setup=1`
 
-Gen 3:
+Scarlett Gen 3:
 
 - Solo: `options snd_usb_audio vid=0x1235 pid=0x8211 device_setup=1`
 - 2i2: `options snd_usb_audio vid=0x1235 pid=0x8210 device_setup=1`
@@ -26,6 +28,10 @@ Gen 3:
 - 18i8: `options snd_usb_audio vid=0x1235 pid=0x8214 device_setup=1`
 - 18i20: `options snd_usb_audio vid=0x1235 pid=0x8215 device_setup=1`
 
+Clarett+:
+
+- 8Pre: `options snd_usb_audio vid=0x1235 pid=0x820c device_setup=1`
+
 Or you can use a sledgehammer:
 ```
 options snd_usb_audio device_setup=1,1,1,1
@@ -138,7 +144,7 @@ The one control not accessible from the front panel is “Phantom Power
 Persistence” (menu option View → Startup) which controls the Phantom
 Power state when the interface is powered on.
 
-## Gen 2 6i6+ and Gen 3 4i4+ Interfaces
+## Gen 2 6i6+, Gen 3 4i4+, and Clarett+ Interfaces
 
 The Gen 2 6i6+ and Gen 3 4i4+ interfaces have many controls available.
 The controls are split between 4 windows, 3 of which are by default
@@ -236,7 +242,7 @@ level/impedance. When plugging in microphones or line-level equipment
 to the input, set it to “Line”. The “Inst” setting is for instrument
 with pickups such as guitars.
 
-#### Air (Gen 3 only)
+#### Air (Gen 3 and Clarett+ only)
 
 Enabling Air will transform your recordings and inspire you while
 making music.
@@ -342,9 +348,9 @@ configuration:
 
 #### Loopback
 
-Gen 2 interfaces have as many PCM Inputs as Hardware Inputs. Gen 3
-interfaces have two more PCM Inputs which the proprietary driver
-restricts to being “Loopback” inputs.
+Gen 2 and Clarett+ interfaces have as many PCM Inputs as Hardware
+Inputs. Gen 3 interfaces have two more PCM Inputs which the
+proprietary driver restricts to being “Loopback” inputs.
 
 The “Loopback” feature advertised for Gen 3 devices is actually a
 limitation of the propretary Focusrite Control software. Both Gen 2

src/alsa.c

@@ -505,7 +505,8 @@ void alsa_scan_cards(void) {
     if (err < 0)
       goto next;
 
-    if (strncmp(snd_ctl_card_info_get_name(info), "Scarlett", 8) != 0)
+    if (strncmp(snd_ctl_card_info_get_name(info), "Scarlett", 8) != 0 &&
+        strncmp(snd_ctl_card_info_get_name(info), "Clarett", 7) != 0)
       goto next;
 
     // is there already an entry for this card in alsa_cards?