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![Colin Ian King](/assets/img/avatar_default.png)
The variable c is being initialized in an outer for-loop and also re-initialized inside an inner for-loop. The first initialization is redundant and can be removed. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Link: https://lore.kernel.org/r/20220207140617.341172-1-colin.i.king@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
595 lines
15 KiB
C
595 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Presonus Studio 1810c driver for ALSA
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* Copyright (C) 2019 Nick Kossifidis <mickflemm@gmail.com>
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*
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* Based on reverse engineering of the communication protocol
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* between the windows driver / Univeral Control (UC) program
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* and the device, through usbmon.
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*
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* For now this bypasses the mixer, with all channels split,
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* so that the software can mix with greater flexibility.
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* It also adds controls for the 4 buttons on the front of
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* the device.
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*/
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#include <linux/usb.h>
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#include <linux/usb/audio-v2.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include "usbaudio.h"
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#include "mixer.h"
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#include "mixer_quirks.h"
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#include "helper.h"
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#include "mixer_s1810c.h"
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#define SC1810C_CMD_REQ 160
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#define SC1810C_CMD_REQTYPE \
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(USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT)
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#define SC1810C_CMD_F1 0x50617269
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#define SC1810C_CMD_F2 0x14
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/*
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* DISCLAIMER: These are just guesses based on the
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* dumps I got.
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*
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* It seems like a selects between
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* device (0), mixer (0x64) and output (0x65)
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*
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* For mixer (0x64):
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* * b selects an input channel (see below).
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* * c selects an output channel pair (see below).
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* * d selects left (0) or right (1) of that pair.
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* * e 0-> disconnect, 0x01000000-> connect,
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* 0x0109-> used for stereo-linking channels,
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* e is also used for setting volume levels
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* in which case b is also set so I guess
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* this way it is possible to set the volume
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* level from the specified input to the
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* specified output.
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*
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* IN Channels:
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* 0 - 7 Mic/Inst/Line (Analog inputs)
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* 8 - 9 S/PDIF
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* 10 - 17 ADAT
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* 18 - 35 DAW (Inputs from the host)
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*
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* OUT Channels (pairs):
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* 0 -> Main out
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* 1 -> Line1/2
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* 2 -> Line3/4
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* 3 -> S/PDIF
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* 4 -> ADAT?
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*
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* For device (0):
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* * b and c are not used, at least not on the
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* dumps I got.
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* * d sets the control id to be modified
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* (see below).
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* * e sets the setting for that control.
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* (so for the switches I was interested
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* in it's 0/1)
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*
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* For output (0x65):
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* * b is the output channel (see above).
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* * c is zero.
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* * e I guess the same as with mixer except 0x0109
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* which I didn't see in my dumps.
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*
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* The two fixed fields have the same values for
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* mixer and output but a different set for device.
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*/
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struct s1810c_ctl_packet {
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u32 a;
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u32 b;
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u32 fixed1;
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u32 fixed2;
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u32 c;
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u32 d;
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u32 e;
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};
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#define SC1810C_CTL_LINE_SW 0
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#define SC1810C_CTL_MUTE_SW 1
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#define SC1810C_CTL_AB_SW 3
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#define SC1810C_CTL_48V_SW 4
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#define SC1810C_SET_STATE_REQ 161
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#define SC1810C_SET_STATE_REQTYPE SC1810C_CMD_REQTYPE
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#define SC1810C_SET_STATE_F1 0x64656D73
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#define SC1810C_SET_STATE_F2 0xF4
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#define SC1810C_GET_STATE_REQ 162
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#define SC1810C_GET_STATE_REQTYPE \
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(USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN)
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#define SC1810C_GET_STATE_F1 SC1810C_SET_STATE_F1
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#define SC1810C_GET_STATE_F2 SC1810C_SET_STATE_F2
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#define SC1810C_STATE_F1_IDX 2
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#define SC1810C_STATE_F2_IDX 3
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/*
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* This packet includes mixer volumes and
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* various other fields, it's an extended
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* version of ctl_packet, with a and b
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* being zero and different f1/f2.
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*/
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struct s1810c_state_packet {
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u32 fields[63];
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};
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#define SC1810C_STATE_48V_SW 58
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#define SC1810C_STATE_LINE_SW 59
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#define SC1810C_STATE_MUTE_SW 60
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#define SC1810C_STATE_AB_SW 62
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struct s1810_mixer_state {
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uint16_t seqnum;
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struct mutex usb_mutex;
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struct mutex data_mutex;
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};
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static int
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snd_s1810c_send_ctl_packet(struct usb_device *dev, u32 a,
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u32 b, u32 c, u32 d, u32 e)
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{
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struct s1810c_ctl_packet pkt = { 0 };
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int ret = 0;
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pkt.fixed1 = SC1810C_CMD_F1;
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pkt.fixed2 = SC1810C_CMD_F2;
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pkt.a = a;
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pkt.b = b;
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pkt.c = c;
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pkt.d = d;
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/*
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* Value for settings 0/1 for this
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* output channel is always 0 (probably because
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* there is no ADAT output on 1810c)
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*/
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pkt.e = (c == 4) ? 0 : e;
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ret = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
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SC1810C_CMD_REQ,
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SC1810C_CMD_REQTYPE, 0, 0, &pkt, sizeof(pkt));
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if (ret < 0) {
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dev_warn(&dev->dev, "could not send ctl packet\n");
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return ret;
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}
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return 0;
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}
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/*
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* When opening Universal Control the program periodically
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* sends and receives state packets for syncinc state between
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* the device and the host.
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*
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* Note that if we send only the request to get data back we'll
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* get an error, we need to first send an empty state packet and
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* then ask to receive a filled. Their seqnumbers must also match.
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*/
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static int
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snd_sc1810c_get_status_field(struct usb_device *dev,
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u32 *field, int field_idx, uint16_t *seqnum)
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{
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struct s1810c_state_packet pkt_out = { { 0 } };
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struct s1810c_state_packet pkt_in = { { 0 } };
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int ret = 0;
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pkt_out.fields[SC1810C_STATE_F1_IDX] = SC1810C_SET_STATE_F1;
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pkt_out.fields[SC1810C_STATE_F2_IDX] = SC1810C_SET_STATE_F2;
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ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
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SC1810C_SET_STATE_REQ,
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SC1810C_SET_STATE_REQTYPE,
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(*seqnum), 0, &pkt_out, sizeof(pkt_out));
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if (ret < 0) {
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dev_warn(&dev->dev, "could not send state packet (%d)\n", ret);
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return ret;
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}
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ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
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SC1810C_GET_STATE_REQ,
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SC1810C_GET_STATE_REQTYPE,
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(*seqnum), 0, &pkt_in, sizeof(pkt_in));
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if (ret < 0) {
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dev_warn(&dev->dev, "could not get state field %u (%d)\n",
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field_idx, ret);
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return ret;
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}
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(*field) = pkt_in.fields[field_idx];
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(*seqnum)++;
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return 0;
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}
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/*
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* This is what I got when bypassing the mixer with
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* all channels split. I'm not 100% sure of what's going
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* on, I could probably clean this up based on my observations
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* but I prefer to keep the same behavior as the windows driver.
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*/
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static int snd_s1810c_init_mixer_maps(struct snd_usb_audio *chip)
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{
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u32 a, b, c, e, n, off;
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struct usb_device *dev = chip->dev;
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/* Set initial volume levels ? */
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a = 0x64;
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e = 0xbc;
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for (n = 0; n < 2; n++) {
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off = n * 18;
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for (b = off; b < 18 + off; b++) {
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/* This channel to all outputs ? */
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for (c = 0; c <= 8; c++) {
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snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
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}
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/* This channel to main output (again) */
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snd_s1810c_send_ctl_packet(dev, a, b, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, 0, 1, e);
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}
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/*
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* I noticed on UC that DAW channels have different
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* initial volumes, so this makes sense.
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*/
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e = 0xb53bf0;
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}
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/* Connect analog outputs ? */
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a = 0x65;
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e = 0x01000000;
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for (b = 1; b < 3; b++) {
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snd_s1810c_send_ctl_packet(dev, a, b, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, 0, 1, e);
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}
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snd_s1810c_send_ctl_packet(dev, a, 0, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, 0, 0, 1, e);
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/* Set initial volume levels for S/PDIF mappings ? */
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a = 0x64;
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e = 0xbc;
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c = 3;
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for (n = 0; n < 2; n++) {
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off = n * 18;
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for (b = off; b < 18 + off; b++) {
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snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
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}
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e = 0xb53bf0;
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}
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/* Connect S/PDIF output ? */
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a = 0x65;
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e = 0x01000000;
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snd_s1810c_send_ctl_packet(dev, a, 3, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, 3, 0, 1, e);
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/* Connect all outputs (again) ? */
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a = 0x65;
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e = 0x01000000;
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for (b = 0; b < 4; b++) {
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snd_s1810c_send_ctl_packet(dev, a, b, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, 0, 1, e);
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}
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/* Basic routing to get sound out of the device */
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a = 0x64;
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e = 0x01000000;
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for (c = 0; c < 4; c++) {
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for (b = 0; b < 36; b++) {
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if ((c == 0 && b == 18) || /* DAW1/2 -> Main */
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(c == 1 && b == 20) || /* DAW3/4 -> Line3/4 */
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(c == 2 && b == 22) || /* DAW4/5 -> Line5/6 */
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(c == 3 && b == 24)) { /* DAW5/6 -> S/PDIF */
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/* Left */
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snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, c, 1, 0);
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b++;
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/* Right */
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snd_s1810c_send_ctl_packet(dev, a, b, c, 0, 0);
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snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
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} else {
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/* Leave the rest disconnected */
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snd_s1810c_send_ctl_packet(dev, a, b, c, 0, 0);
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snd_s1810c_send_ctl_packet(dev, a, b, c, 1, 0);
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}
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}
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}
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/* Set initial volume levels for S/PDIF (again) ? */
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a = 0x64;
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e = 0xbc;
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c = 3;
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for (n = 0; n < 2; n++) {
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off = n * 18;
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for (b = off; b < 18 + off; b++) {
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snd_s1810c_send_ctl_packet(dev, a, b, c, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, b, c, 1, e);
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}
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e = 0xb53bf0;
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}
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/* Connect S/PDIF outputs (again) ? */
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a = 0x65;
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e = 0x01000000;
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snd_s1810c_send_ctl_packet(dev, a, 3, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, 3, 0, 1, e);
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/* Again ? */
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snd_s1810c_send_ctl_packet(dev, a, 3, 0, 0, e);
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snd_s1810c_send_ctl_packet(dev, a, 3, 0, 1, e);
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return 0;
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}
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/*
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* Sync state with the device and retrieve the requested field,
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* whose index is specified in (kctl->private_value & 0xFF),
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* from the received fields array.
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*/
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static int
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snd_s1810c_get_switch_state(struct usb_mixer_interface *mixer,
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struct snd_kcontrol *kctl, u32 *state)
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{
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struct snd_usb_audio *chip = mixer->chip;
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struct s1810_mixer_state *private = mixer->private_data;
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u32 field = 0;
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u32 ctl_idx = (u32) (kctl->private_value & 0xFF);
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int ret = 0;
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mutex_lock(&private->usb_mutex);
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ret = snd_sc1810c_get_status_field(chip->dev, &field,
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ctl_idx, &private->seqnum);
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if (ret < 0)
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goto unlock;
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*state = field;
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unlock:
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mutex_unlock(&private->usb_mutex);
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return ret ? ret : 0;
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}
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/*
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* Send a control packet to the device for the control id
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* specified in (kctl->private_value >> 8) with value
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* specified in (kctl->private_value >> 16).
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*/
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static int
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snd_s1810c_set_switch_state(struct usb_mixer_interface *mixer,
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struct snd_kcontrol *kctl)
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{
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struct snd_usb_audio *chip = mixer->chip;
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struct s1810_mixer_state *private = mixer->private_data;
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u32 pval = (u32) kctl->private_value;
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u32 ctl_id = (pval >> 8) & 0xFF;
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u32 ctl_val = (pval >> 16) & 0x1;
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int ret = 0;
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mutex_lock(&private->usb_mutex);
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ret = snd_s1810c_send_ctl_packet(chip->dev, 0, 0, 0, ctl_id, ctl_val);
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mutex_unlock(&private->usb_mutex);
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return ret;
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}
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/* Generic get/set/init functions for switch controls */
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static int
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snd_s1810c_switch_get(struct snd_kcontrol *kctl,
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struct snd_ctl_elem_value *ctl_elem)
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{
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struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
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struct usb_mixer_interface *mixer = list->mixer;
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struct s1810_mixer_state *private = mixer->private_data;
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u32 pval = (u32) kctl->private_value;
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u32 ctl_idx = pval & 0xFF;
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u32 state = 0;
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int ret = 0;
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mutex_lock(&private->data_mutex);
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ret = snd_s1810c_get_switch_state(mixer, kctl, &state);
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if (ret < 0)
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goto unlock;
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switch (ctl_idx) {
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case SC1810C_STATE_LINE_SW:
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case SC1810C_STATE_AB_SW:
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ctl_elem->value.enumerated.item[0] = (int)state;
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break;
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default:
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ctl_elem->value.integer.value[0] = (long)state;
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}
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unlock:
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mutex_unlock(&private->data_mutex);
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return (ret < 0) ? ret : 0;
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}
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static int
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snd_s1810c_switch_set(struct snd_kcontrol *kctl,
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struct snd_ctl_elem_value *ctl_elem)
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{
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struct usb_mixer_elem_list *list = snd_kcontrol_chip(kctl);
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struct usb_mixer_interface *mixer = list->mixer;
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struct s1810_mixer_state *private = mixer->private_data;
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u32 pval = (u32) kctl->private_value;
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u32 ctl_idx = pval & 0xFF;
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u32 curval = 0;
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u32 newval = 0;
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int ret = 0;
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mutex_lock(&private->data_mutex);
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ret = snd_s1810c_get_switch_state(mixer, kctl, &curval);
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if (ret < 0)
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goto unlock;
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switch (ctl_idx) {
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case SC1810C_STATE_LINE_SW:
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case SC1810C_STATE_AB_SW:
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newval = (u32) ctl_elem->value.enumerated.item[0];
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break;
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default:
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newval = (u32) ctl_elem->value.integer.value[0];
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}
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if (curval == newval)
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goto unlock;
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kctl->private_value &= ~(0x1 << 16);
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kctl->private_value |= (unsigned int)(newval & 0x1) << 16;
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ret = snd_s1810c_set_switch_state(mixer, kctl);
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unlock:
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mutex_unlock(&private->data_mutex);
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return (ret < 0) ? 0 : 1;
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}
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static int
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snd_s1810c_switch_init(struct usb_mixer_interface *mixer,
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const struct snd_kcontrol_new *new_kctl)
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{
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struct snd_kcontrol *kctl;
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struct usb_mixer_elem_info *elem;
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elem = kzalloc(sizeof(struct usb_mixer_elem_info), GFP_KERNEL);
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if (!elem)
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return -ENOMEM;
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elem->head.mixer = mixer;
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elem->control = 0;
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elem->head.id = 0;
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elem->channels = 1;
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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;
|
|
}
|