--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Presonus Studio 1810c driver for ALSA
+ * Copyright (C) 2019 Nick Kossifidis <mickflemm@gmail.com>
+ *
+ * Based on reverse engineering of the communication protocol
+ * between the windows driver / Univeral Control (UC) program
+ * and the device, through usbmon.
+ *
+ * For now this bypasses the mixer, with all channels split,
+ * so that the software can mix with greater flexibility.
+ * It also adds controls for the 4 buttons on the front of
+ * the device.
+ */
+
+#include <linux/usb.h>
+#include <linux/usb/audio-v2.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/control.h>
+
+#include "usbaudio.h"
+#include "mixer.h"
+#include "mixer_quirks.h"
+#include "helper.h"
+#include "mixer_s1810c.h"
+
+#define SC1810C_CMD_REQ 160
+#define SC1810C_CMD_REQTYPE \
+ (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT)
+#define SC1810C_CMD_F1 0x50617269
+#define SC1810C_CMD_F2 0x14
+
+/*
+ * DISCLAIMER: These are just guesses based on the
+ * dumps I got.
+ *
+ * It seems like a selects between
+ * device (0), mixer (0x64) and output (0x65)
+ *
+ * For mixer (0x64):
+ * * b selects an input channel (see below).
+ * * c selects an output channel pair (see below).
+ * * d selects left (0) or right (1) of that pair.
+ * * e 0-> disconnect, 0x01000000-> connect,
+ * 0x0109-> used for stereo-linking channels,
+ * e is also used for setting volume levels
+ * in which case b is also set so I guess
+ * this way it is possible to set the volume
+ * level from the specified input to the
+ * specified output.
+ *
+ * IN Channels:
+ * 0 - 7 Mic/Inst/Line (Analog inputs)
+ * 8 - 9 S/PDIF
+ * 10 - 17 ADAT
+ * 18 - 35 DAW (Inputs from the host)
+ *
+ * OUT Channels (pairs):
+ * 0 -> Main out
+ * 1 -> Line1/2
+ * 2 -> Line3/4
+ * 3 -> S/PDIF
+ * 4 -> ADAT?
+ *
+ * For device (0):
+ * * b and c are not used, at least not on the
+ * dumps I got.
+ * * d sets the control id to be modified
+ * (see below).
+ * * e sets the setting for that control.
+ * (so for the switches I was interested
+ * in it's 0/1)
+ *
+ * For output (0x65):
+ * * b is the output channel (see above).
+ * * c is zero.
+ * * e I guess the same as with mixer except 0x0109
+ * which I didn't see in my dumps.
+ *
+ * The two fixed fields have the same values for
+ * mixer and output but a different set for device.
+ */
+struct s1810c_ctl_packet {
+ u32 a;
+ u32 b;
+ u32 fixed1;
+ u32 fixed2;
+ u32 c;
+ u32 d;
+ u32 e;
+};
+
+#define SC1810C_CTL_LINE_SW 0
+#define SC1810C_CTL_MUTE_SW 1
+#define SC1810C_CTL_AB_SW 3
+#define SC1810C_CTL_48V_SW 4
+
+#define SC1810C_SET_STATE_REQ 161
+#define SC1810C_SET_STATE_REQTYPE SC1810C_CMD_REQTYPE
+#define SC1810C_SET_STATE_F1 0x64656D73
+#define SC1810C_SET_STATE_F2 0xF4
+
+#define SC1810C_GET_STATE_REQ 162
+#define SC1810C_GET_STATE_REQTYPE \
+ (USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN)
+#define SC1810C_GET_STATE_F1 SC1810C_SET_STATE_F1
+#define SC1810C_GET_STATE_F2 SC1810C_SET_STATE_F2
+
+#define SC1810C_STATE_F1_IDX 2
+#define SC1810C_STATE_F2_IDX 3
+
+/*
+ * This packet includes mixer volumes and
+ * various other fields, it's an extended
+ * version of ctl_packet, with a and b
+ * being zero and different f1/f2.
+ */
+struct s1810c_state_packet {
+ u32 fields[63];
+};
+
+#define SC1810C_STATE_48V_SW 58
+#define SC1810C_STATE_LINE_SW 59
+#define SC1810C_STATE_MUTE_SW 60
+#define SC1810C_STATE_AB_SW 62
+
+struct s1810_mixer_state {
+ uint16_t seqnum;
+ struct mutex usb_mutex;
+ struct mutex data_mutex;
+};
+
+static int
+snd_s1810c_send_ctl_packet(struct usb_device *dev, u32 a,
+ u32 b, u32 c, u32 d, u32 e)
+{
+ struct s1810c_ctl_packet pkt = { 0 };
+ int ret = 0;
+
+ pkt.fixed1 = SC1810C_CMD_F1;
+ pkt.fixed2 = SC1810C_CMD_F2;
+
+ pkt.a = a;
+ pkt.b = b;
+ pkt.c = c;
+ pkt.d = d;
+ /*
+ * Value for settings 0/1 for this
+ * output channel is always 0 (probably because
+ * there is no ADAT output on 1810c)
+ */
+ pkt.e = (c == 4) ? 0 : e;
+
+ ret = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
+ SC1810C_CMD_REQ,
+ SC1810C_CMD_REQTYPE, 0, 0, &pkt, sizeof(pkt));
+ if (ret < 0) {
+ dev_warn(&dev->dev, "could not send ctl packet\n");
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * When opening Universal Control the program periodicaly
+ * sends and receives state packets for syncinc state between
+ * the device and the host.
+ *
+ * Note that if we send only the request to get data back we'll
+ * get an error, we need to first send an empty state packet and
+ * then ask to receive a filled. Their seqnumbers must also match.
+ */
+static int
+snd_sc1810c_get_status_field(struct usb_device *dev,
+ u32 *field, int field_idx, uint16_t *seqnum)
+{
+ struct s1810c_state_packet pkt_out = { 0 };
+ struct s1810c_state_packet pkt_in = { 0 };
+ int ret = 0;
+
+ pkt_out.fields[SC1810C_STATE_F1_IDX] = SC1810C_SET_STATE_F1;
+ pkt_out.fields[SC1810C_STATE_F2_IDX] = SC1810C_SET_STATE_F2;
+ ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
+ SC1810C_SET_STATE_REQ,
+ SC1810C_SET_STATE_REQTYPE,
+ (*seqnum), 0, &pkt_out, sizeof(pkt_out));
+ if (ret < 0) {
+ dev_warn(&dev->dev, "could not send state packet (%d)\n", ret);
+ return ret;
+ }
+
+ ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
+ SC1810C_GET_STATE_REQ,
+ SC1810C_GET_STATE_REQTYPE,
+ (*seqnum), 0, &pkt_in, sizeof(pkt_in));
+ if (ret < 0) {
+ dev_warn(&dev->dev, "could not get state field %u (%d)\n",
+ field_idx, ret);
+ return ret;
+ }
+
+ (*field) = pkt_in.fields[field_idx];
+ (*seqnum)++;
+ return 0;
+}
+
+/*
+ * This is what I got when bypassing the mixer with
+ * all channels split. I'm not 100% sure of what's going
+ * on, I could probably clean this up based on my observations
+ * but I prefer to keep the same behavior as the windows driver.
+ */
+static int snd_s1810c_init_mixer_maps(struct snd_usb_audio *chip)
+{
+ u32 a, b, c, e, n, off;
+ struct usb_device *dev = chip->dev;
+
+ /* Set initial volume levels ? */
+ a = 0x64;
+ e = 0xbc;
+ for (n = 0; n < 2; n++) {
+ off = n * 18;
+ for (b = off, c = 0; b < 18 + off; b++) {
+ /* This channel to all outputs ? */
+ for (c = 0; c <= 8; c++) {
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
+ }
+ /* This channel to main output (again) */
+ snd_s1810c_send_ctl_packet(dev, a, b, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, 0, 1, e);
+ }
+ /*
+ * I noticed on UC that DAW channels have different
+ * initial volumes, so this makes sense.
+ */
+ e = 0xb53bf0;
+ }
+
+ /* Connect analog outputs ? */
+ a = 0x65;
+ e = 0x01000000;
+ for (b = 1; b < 3; b++) {
+ snd_s1810c_send_ctl_packet(dev, a, b, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, 0, 1, e);
+ }
+ snd_s1810c_send_ctl_packet(dev, a, 0, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, 0, 0, 1, e);
+
+ /* Set initial volume levels for S/PDIF mappings ? */
+ a = 0x64;
+ e = 0xbc;
+ c = 3;
+ for (n = 0; n < 2; n++) {
+ off = n * 18;
+ for (b = off; b < 18 + off; b++) {
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
+ }
+ e = 0xb53bf0;
+ }
+
+ /* Connect S/PDIF output ? */
+ a = 0x65;
+ e = 0x01000000;
+ snd_s1810c_send_ctl_packet(dev, a, 3, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, 3, 0, 1, e);
+
+ /* Connect all outputs (again) ? */
+ a = 0x65;
+ e = 0x01000000;
+ for (b = 0; b < 4; b++) {
+ snd_s1810c_send_ctl_packet(dev, a, b, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, 0, 1, e);
+ }
+
+ /* Basic routing to get sound out of the device */
+ a = 0x64;
+ e = 0x01000000;
+ for (c = 0; c < 4; c++) {
+ for (b = 0; b < 36; b++) {
+ if ((c == 0 && b == 18) || /* DAW1/2 -> Main */
+ (c == 1 && b == 20) || /* DAW3/4 -> Line3/4 */
+ (c == 2 && b == 22) || /* DAW4/5 -> Line5/6 */
+ (c == 3 && b == 24)) { /* DAW5/6 -> S/PDIF */
+ /* Left */
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 1, 0);
+ b++;
+ /* Right */
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 0, 0);
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
+ } else {
+ /* Leave the rest disconnected */
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 0, 0);
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 1, 0);
+ }
+ }
+ }
+
+ /* Set initial volume levels for S/PDIF (again) ? */
+ a = 0x64;
+ e = 0xbc;
+ c = 3;
+ for (n = 0; n < 2; n++) {
+ off = n * 18;
+ for (b = off; b < 18 + off; b++) {
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
+ }
+ e = 0xb53bf0;
+ }
+
+ /* Connect S/PDIF outputs (again) ? */
+ a = 0x65;
+ e = 0x01000000;
+ snd_s1810c_send_ctl_packet(dev, a, 3, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, 3, 0, 1, e);
+
+ /* Again ? */
+ snd_s1810c_send_ctl_packet(dev, a, 3, 0, 0, e);
+ snd_s1810c_send_ctl_packet(dev, a, 3, 0, 1, e);
+
+ return 0;
+}
+
+/*
+ * Sync state with the device and retrieve the requested field,
+ * whose index is specified in (kctl->private_value & 0xFF),
+ * from the received fields array.
+ */
+static int
+snd_s1810c_get_switch_state(struct usb_mixer_interface *mixer,
+ struct snd_kcontrol *kctl, u32 *state)
+{
+ struct snd_usb_audio *chip = mixer->chip;
+ struct s1810_mixer_state *private = mixer->private_data;
+ u32 field = 0;
+ u32 ctl_idx = (u32) (kctl->private_value & 0xFF);
+ int ret = 0;
+
+ mutex_lock(&private->usb_mutex);
+ ret = snd_sc1810c_get_status_field(chip->dev, &field,
+ ctl_idx, &private->seqnum);
+ if (ret < 0)
+ goto unlock;
+
+ *state = field;
+ unlock:
+ mutex_unlock(&private->usb_mutex);
+ return ret ? ret : 0;
+}
+
+/*
+ * Send a control packet to the device for the control id
+ * specified in (kctl->private_value >> 8) with value
+ * specified in (kctl->private_value >> 16).
+ */
+static int
+snd_s1810c_set_switch_state(struct usb_mixer_interface *mixer,
+ struct snd_kcontrol *kctl)
+{
+ struct snd_usb_audio *chip = mixer->chip;
+ struct s1810_mixer_state *private = mixer->private_data;
+ u32 pval = (u32) kctl->private_value;
+ u32 ctl_id = (pval >> 8) & 0xFF;
+ u32 ctl_val = (pval >> 16) & 0x1;
+ int ret = 0;
+
+ mutex_lock(&private->usb_mutex);
+ ret = snd_s1810c_send_ctl_packet(chip->dev, 0, 0, 0, ctl_id, ctl_val);
+ mutex_unlock(&private->usb_mutex);
+ return ret;
+}
+
+/* Generic get/set/init functions for switch controls */
+
+static int
+snd_s1810c_switch_get(struct snd_kcontrol *kctl,
+ struct snd_ctl_elem_value *ctl_elem)
+{
+ struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
+ struct usb_mixer_interface *mixer = list->mixer;
+ struct s1810_mixer_state *private = mixer->private_data;
+ u32 pval = (u32) kctl->private_value;
+ u32 ctl_idx = pval & 0xFF;
+ u32 state = 0;
+ int ret = 0;
+
+ mutex_lock(&private->data_mutex);
+ ret = snd_s1810c_get_switch_state(mixer, kctl, &state);
+ if (ret < 0)
+ goto unlock;
+
+ switch (ctl_idx) {
+ case SC1810C_STATE_LINE_SW:
+ case SC1810C_STATE_AB_SW:
+ ctl_elem->value.enumerated.item[0] = (int)state;
+ break;
+ default:
+ ctl_elem->value.integer.value[0] = (long)state;
+ }
+
+ unlock:
+ mutex_unlock(&private->data_mutex);
+ return (ret < 0) ? ret : 0;
+}
+
+static int
+snd_s1810c_switch_set(struct snd_kcontrol *kctl,
+ struct snd_ctl_elem_value *ctl_elem)
+{
+ struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
+ struct usb_mixer_interface *mixer = list->mixer;
+ struct s1810_mixer_state *private = mixer->private_data;
+ u32 pval = (u32) kctl->private_value;
+ u32 ctl_idx = pval & 0xFF;
+ u32 curval = 0;
+ u32 newval = 0;
+ int ret = 0;
+
+ mutex_lock(&private->data_mutex);
+ ret = snd_s1810c_get_switch_state(mixer, kctl, &curval);
+ if (ret < 0)
+ goto unlock;
+
+ switch (ctl_idx) {
+ case SC1810C_STATE_LINE_SW:
+ case SC1810C_STATE_AB_SW:
+ newval = (u32) ctl_elem->value.enumerated.item[0];
+ break;
+ default:
+ newval = (u32) ctl_elem->value.integer.value[0];
+ }
+
+ if (curval == newval)
+ goto unlock;
+
+ kctl->private_value &= ~(0x1 << 16);
+ kctl->private_value |= (unsigned int)(newval & 0x1) << 16;
+ ret = snd_s1810c_set_switch_state(mixer, kctl);
+
+ unlock:
+ mutex_unlock(&private->data_mutex);
+ return (ret < 0) ? 0 : 1;
+}
+
+static int
+snd_s1810c_switch_init(struct usb_mixer_interface *mixer,
+ const struct snd_kcontrol_new *new_kctl)
+{
+ struct snd_kcontrol *kctl;
+ struct usb_mixer_elem_info *elem;
+
+ elem = kzalloc(sizeof(struct usb_mixer_elem_info), GFP_KERNEL);
+ if (!elem)
+ return -ENOMEM;
+
+ elem->head.mixer = mixer;
+ elem->control = 0;
+ elem->head.id = 0;
+ elem->channels = 1;
+
+ kctl = snd_ctl_new1(new_kctl, elem);
+ if (!kctl) {
+ kfree(elem);
+ return -ENOMEM;
+ }
+ kctl->private_free = snd_usb_mixer_elem_free;
+
+ return snd_usb_mixer_add_control(&elem->head, kctl);
+}
+
+static int
+snd_s1810c_line_sw_info(struct snd_kcontrol *kctl,
+ struct snd_ctl_elem_info *uinfo)
+{
+ static const char *const texts[2] = {
+ "Preamp On (Mic/Inst)",
+ "Preamp Off (Line in)"
+ };
+
+ return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
+}
+
+static const struct snd_kcontrol_new snd_s1810c_line_sw = {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "Line 1/2 Source Type",
+ .info = snd_s1810c_line_sw_info,
+ .get = snd_s1810c_switch_get,
+ .put = snd_s1810c_switch_set,
+ .private_value = (SC1810C_STATE_LINE_SW | SC1810C_CTL_LINE_SW << 8)
+};
+
+static const struct snd_kcontrol_new snd_s1810c_mute_sw = {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "Mute Main Out Switch",
+ .info = snd_ctl_boolean_mono_info,
+ .get = snd_s1810c_switch_get,
+ .put = snd_s1810c_switch_set,
+ .private_value = (SC1810C_STATE_MUTE_SW | SC1810C_CTL_MUTE_SW << 8)
+};
+
+static const struct snd_kcontrol_new snd_s1810c_48v_sw = {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "48V Phantom Power On Mic Inputs Switch",
+ .info = snd_ctl_boolean_mono_info,
+ .get = snd_s1810c_switch_get,
+ .put = snd_s1810c_switch_set,
+ .private_value = (SC1810C_STATE_48V_SW | SC1810C_CTL_48V_SW << 8)
+};
+
+static int
+snd_s1810c_ab_sw_info(struct snd_kcontrol *kctl,
+ struct snd_ctl_elem_info *uinfo)
+{
+ static const char *const texts[2] = {
+ "1/2",
+ "3/4"
+ };
+
+ return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
+}
+
+static const struct snd_kcontrol_new snd_s1810c_ab_sw = {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "Headphone 1 Source Route",
+ .info = snd_s1810c_ab_sw_info,
+ .get = snd_s1810c_switch_get,
+ .put = snd_s1810c_switch_set,
+ .private_value = (SC1810C_STATE_AB_SW | SC1810C_CTL_AB_SW << 8)
+};
+
+static void snd_sc1810_mixer_state_free(struct usb_mixer_interface *mixer)
+{
+ struct s1810_mixer_state *private = mixer->private_data;
+ kfree(private);
+ mixer->private_data = NULL;
+}
+
+/* Entry point, called from mixer_quirks.c */
+int snd_sc1810_init_mixer(struct usb_mixer_interface *mixer)
+{
+ struct s1810_mixer_state *private = NULL;
+ struct snd_usb_audio *chip = mixer->chip;
+ struct usb_device *dev = chip->dev;
+ int ret = 0;
+
+ /* Run this only once */
+ if (!list_empty(&chip->mixer_list))
+ return 0;
+
+ dev_info(&dev->dev,
+ "Presonus Studio 1810c, device_setup: %u\n", chip->setup);
+ if (chip->setup == 1)
+ dev_info(&dev->dev, "(8out/18in @ 48KHz)\n");
+ else if (chip->setup == 2)
+ dev_info(&dev->dev, "(6out/8in @ 192KHz)\n");
+ else
+ dev_info(&dev->dev, "(8out/14in @ 96KHz)\n");
+
+ ret = snd_s1810c_init_mixer_maps(chip);
+ if (ret < 0)
+ return ret;
+
+ private = kzalloc(sizeof(struct s1810_mixer_state), GFP_KERNEL);
+ if (!private)
+ return -ENOMEM;
+
+ mutex_init(&private->usb_mutex);
+ mutex_init(&private->data_mutex);
+
+ mixer->private_data = private;
+ mixer->private_free = snd_sc1810_mixer_state_free;
+
+ private->seqnum = 1;
+
+ ret = snd_s1810c_switch_init(mixer, &snd_s1810c_line_sw);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_s1810c_switch_init(mixer, &snd_s1810c_mute_sw);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_s1810c_switch_init(mixer, &snd_s1810c_48v_sw);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_s1810c_switch_init(mixer, &snd_s1810c_ab_sw);
+ if (ret < 0)
+ return ret;
+ return ret;
+}
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