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path: root/drivers/usb/gadget/function/f_uac2.c
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Diffstat (limited to 'drivers/usb/gadget/function/f_uac2.c')
-rw-r--r--drivers/usb/gadget/function/f_uac2.c2245
1 files changed, 2245 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
new file mode 100644
index 000000000..0219cd794
--- /dev/null
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -0,0 +1,2245 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * f_uac2.c -- USB Audio Class 2.0 Function
+ *
+ * Copyright (C) 2011
+ * Yadwinder Singh (yadi.brar01@gmail.com)
+ * Jaswinder Singh (jaswinder.singh@linaro.org)
+ *
+ * Copyright (C) 2020
+ * Ruslan Bilovol (ruslan.bilovol@gmail.com)
+ */
+
+#include <linux/usb/audio.h>
+#include <linux/usb/audio-v2.h>
+#include <linux/module.h>
+
+#include "u_audio.h"
+
+#include "u_uac2.h"
+
+/* UAC2 spec: 4.1 Audio Channel Cluster Descriptor */
+#define UAC2_CHANNEL_MASK 0x07FFFFFF
+
+/*
+ * The driver implements a simple UAC_2 topology.
+ * USB-OUT -> IT_1 -> FU -> OT_3 -> ALSA_Capture
+ * ALSA_Playback -> IT_2 -> FU -> OT_4 -> USB-IN
+ * Capture and Playback sampling rates are independently
+ * controlled by two clock sources :
+ * CLK_5 := c_srate, and CLK_6 := p_srate
+ */
+#define USB_OUT_CLK_ID (out_clk_src_desc.bClockID)
+#define USB_IN_CLK_ID (in_clk_src_desc.bClockID)
+#define USB_OUT_FU_ID (out_feature_unit_desc->bUnitID)
+#define USB_IN_FU_ID (in_feature_unit_desc->bUnitID)
+
+#define CONTROL_ABSENT 0
+#define CONTROL_RDONLY 1
+#define CONTROL_RDWR 3
+
+#define CLK_FREQ_CTRL 0
+#define CLK_VLD_CTRL 2
+#define FU_MUTE_CTRL 0
+#define FU_VOL_CTRL 2
+
+#define COPY_CTRL 0
+#define CONN_CTRL 2
+#define OVRLD_CTRL 4
+#define CLSTR_CTRL 6
+#define UNFLW_CTRL 8
+#define OVFLW_CTRL 10
+
+#define EPIN_EN(_opts) ((_opts)->p_chmask != 0)
+#define EPOUT_EN(_opts) ((_opts)->c_chmask != 0)
+#define FUIN_EN(_opts) (EPIN_EN(_opts) \
+ && ((_opts)->p_mute_present \
+ || (_opts)->p_volume_present))
+#define FUOUT_EN(_opts) (EPOUT_EN(_opts) \
+ && ((_opts)->c_mute_present \
+ || (_opts)->c_volume_present))
+#define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC)
+
+struct f_uac2 {
+ struct g_audio g_audio;
+ u8 ac_intf, as_in_intf, as_out_intf;
+ u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
+
+ struct usb_ctrlrequest setup_cr; /* will be used in data stage */
+
+ /* Interrupt IN endpoint of AC interface */
+ struct usb_ep *int_ep;
+ atomic_t int_count;
+ /* transient state, only valid during handling of a single control request */
+ int clock_id;
+};
+
+static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
+{
+ return container_of(f, struct f_uac2, g_audio.func);
+}
+
+static inline
+struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
+{
+ return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
+}
+
+static int afunc_notify(struct g_audio *agdev, int unit_id, int cs);
+
+/* --------- USB Function Interface ------------- */
+
+enum {
+ STR_ASSOC,
+ STR_IF_CTRL,
+ STR_CLKSRC_IN,
+ STR_CLKSRC_OUT,
+ STR_USB_IT,
+ STR_IO_IT,
+ STR_USB_OT,
+ STR_IO_OT,
+ STR_FU_IN,
+ STR_FU_OUT,
+ STR_AS_OUT_ALT0,
+ STR_AS_OUT_ALT1,
+ STR_AS_IN_ALT0,
+ STR_AS_IN_ALT1,
+};
+
+static struct usb_string strings_fn[] = {
+ /* [STR_ASSOC].s = DYNAMIC, */
+ [STR_IF_CTRL].s = "Topology Control",
+ [STR_CLKSRC_IN].s = "Input Clock",
+ [STR_CLKSRC_OUT].s = "Output Clock",
+ [STR_USB_IT].s = "USBH Out",
+ [STR_IO_IT].s = "USBD Out",
+ [STR_USB_OT].s = "USBH In",
+ [STR_IO_OT].s = "USBD In",
+ [STR_FU_IN].s = "Capture Volume",
+ [STR_FU_OUT].s = "Playback Volume",
+ [STR_AS_OUT_ALT0].s = "Playback Inactive",
+ [STR_AS_OUT_ALT1].s = "Playback Active",
+ [STR_AS_IN_ALT0].s = "Capture Inactive",
+ [STR_AS_IN_ALT1].s = "Capture Active",
+ { },
+};
+
+static const char *const speed_names[] = {
+ [USB_SPEED_UNKNOWN] = "UNKNOWN",
+ [USB_SPEED_LOW] = "LS",
+ [USB_SPEED_FULL] = "FS",
+ [USB_SPEED_HIGH] = "HS",
+ [USB_SPEED_WIRELESS] = "W",
+ [USB_SPEED_SUPER] = "SS",
+ [USB_SPEED_SUPER_PLUS] = "SS+",
+};
+
+static struct usb_gadget_strings str_fn = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_fn,
+};
+
+static struct usb_gadget_strings *fn_strings[] = {
+ &str_fn,
+ NULL,
+};
+
+static struct usb_interface_assoc_descriptor iad_desc = {
+ .bLength = sizeof iad_desc,
+ .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
+
+ .bFirstInterface = 0,
+ .bInterfaceCount = 3,
+ .bFunctionClass = USB_CLASS_AUDIO,
+ .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
+ .bFunctionProtocol = UAC_VERSION_2,
+};
+
+/* Audio Control Interface */
+static struct usb_interface_descriptor std_ac_if_desc = {
+ .bLength = sizeof std_ac_if_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bAlternateSetting = 0,
+ /* .bNumEndpoints = DYNAMIC */
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
+ .bInterfaceProtocol = UAC_VERSION_2,
+};
+
+/* Clock source for IN traffic */
+static struct uac_clock_source_descriptor in_clk_src_desc = {
+ .bLength = sizeof in_clk_src_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
+ /* .bClockID = DYNAMIC */
+ .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
+ .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
+ .bAssocTerminal = 0,
+};
+
+/* Clock source for OUT traffic */
+static struct uac_clock_source_descriptor out_clk_src_desc = {
+ .bLength = sizeof out_clk_src_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
+ /* .bClockID = DYNAMIC */
+ .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
+ .bmControls = (CONTROL_RDWR << CLK_FREQ_CTRL),
+ .bAssocTerminal = 0,
+};
+
+/* Input Terminal for USB_OUT */
+static struct uac2_input_terminal_descriptor usb_out_it_desc = {
+ .bLength = sizeof usb_out_it_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_INPUT_TERMINAL,
+ /* .bTerminalID = DYNAMIC */
+ .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
+ .bAssocTerminal = 0,
+ /* .bCSourceID = DYNAMIC */
+ .iChannelNames = 0,
+ .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
+};
+
+/* Input Terminal for I/O-In */
+static struct uac2_input_terminal_descriptor io_in_it_desc = {
+ .bLength = sizeof io_in_it_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_INPUT_TERMINAL,
+ /* .bTerminalID = DYNAMIC */
+ .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
+ .bAssocTerminal = 0,
+ /* .bCSourceID = DYNAMIC */
+ .iChannelNames = 0,
+ .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
+};
+
+/* Ouput Terminal for USB_IN */
+static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
+ .bLength = sizeof usb_in_ot_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
+ /* .bTerminalID = DYNAMIC */
+ .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
+ .bAssocTerminal = 0,
+ /* .bSourceID = DYNAMIC */
+ /* .bCSourceID = DYNAMIC */
+ .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
+};
+
+/* Ouput Terminal for I/O-Out */
+static struct uac2_output_terminal_descriptor io_out_ot_desc = {
+ .bLength = sizeof io_out_ot_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
+ /* .bTerminalID = DYNAMIC */
+ .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
+ .bAssocTerminal = 0,
+ /* .bSourceID = DYNAMIC */
+ /* .bCSourceID = DYNAMIC */
+ .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
+};
+
+static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
+static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
+
+static struct uac2_ac_header_descriptor ac_hdr_desc = {
+ .bLength = sizeof ac_hdr_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_MS_HEADER,
+ .bcdADC = cpu_to_le16(0x200),
+ .bCategory = UAC2_FUNCTION_IO_BOX,
+ /* .wTotalLength = DYNAMIC */
+ .bmControls = 0,
+};
+
+/* AC IN Interrupt Endpoint */
+static struct usb_endpoint_descriptor fs_ep_int_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = cpu_to_le16(6),
+ .bInterval = 1,
+};
+
+static struct usb_endpoint_descriptor hs_ep_int_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = cpu_to_le16(6),
+ .bInterval = 4,
+};
+
+static struct usb_endpoint_descriptor ss_ep_int_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = cpu_to_le16(6),
+ .bInterval = 4,
+};
+
+static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = {
+ .bLength = sizeof(ss_ep_int_desc_comp),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .wBytesPerInterval = cpu_to_le16(6),
+};
+
+/* Audio Streaming OUT Interface - Alt0 */
+static struct usb_interface_descriptor std_as_out_if0_desc = {
+ .bLength = sizeof std_as_out_if0_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+ .bInterfaceProtocol = UAC_VERSION_2,
+};
+
+/* Audio Streaming OUT Interface - Alt1 */
+static struct usb_interface_descriptor std_as_out_if1_desc = {
+ .bLength = sizeof std_as_out_if1_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+ .bInterfaceProtocol = UAC_VERSION_2,
+};
+
+/* Audio Stream OUT Intface Desc */
+static struct uac2_as_header_descriptor as_out_hdr_desc = {
+ .bLength = sizeof as_out_hdr_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_AS_GENERAL,
+ /* .bTerminalLink = DYNAMIC */
+ .bmControls = 0,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+ .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
+ .iChannelNames = 0,
+};
+
+/* Audio USB_OUT Format */
+static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
+ .bLength = sizeof as_out_fmt1_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FORMAT_TYPE,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+};
+
+/* STD AS ISO OUT Endpoint */
+static struct usb_endpoint_descriptor fs_epout_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_OUT,
+ /* .bmAttributes = DYNAMIC */
+ /* .wMaxPacketSize = DYNAMIC */
+ .bInterval = 1,
+};
+
+static struct usb_endpoint_descriptor hs_epout_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ /* .bmAttributes = DYNAMIC */
+ /* .wMaxPacketSize = DYNAMIC */
+ /* .bInterval = DYNAMIC */
+};
+
+static struct usb_endpoint_descriptor ss_epout_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_OUT,
+ /* .bmAttributes = DYNAMIC */
+ /* .wMaxPacketSize = DYNAMIC */
+ /* .bInterval = DYNAMIC */
+};
+
+static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
+ .bLength = sizeof(ss_epout_desc_comp),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ /* wBytesPerInterval = DYNAMIC */
+};
+
+/* CS AS ISO OUT Endpoint */
+static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
+ .bLength = sizeof as_iso_out_desc,
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+
+ .bDescriptorSubtype = UAC_EP_GENERAL,
+ .bmAttributes = 0,
+ .bmControls = 0,
+ .bLockDelayUnits = 0,
+ .wLockDelay = 0,
+};
+
+/* STD AS ISO IN Feedback Endpoint */
+static struct usb_endpoint_descriptor fs_epin_fback_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
+ .wMaxPacketSize = cpu_to_le16(3),
+ .bInterval = 1,
+};
+
+static struct usb_endpoint_descriptor hs_epin_fback_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
+ .wMaxPacketSize = cpu_to_le16(4),
+ .bInterval = 4,
+};
+
+static struct usb_endpoint_descriptor ss_epin_fback_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK,
+ .wMaxPacketSize = cpu_to_le16(4),
+ .bInterval = 4,
+};
+
+static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = {
+ .bLength = sizeof(ss_epin_fback_desc_comp),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ .wBytesPerInterval = cpu_to_le16(4),
+};
+
+
+/* Audio Streaming IN Interface - Alt0 */
+static struct usb_interface_descriptor std_as_in_if0_desc = {
+ .bLength = sizeof std_as_in_if0_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+ .bInterfaceProtocol = UAC_VERSION_2,
+};
+
+/* Audio Streaming IN Interface - Alt1 */
+static struct usb_interface_descriptor std_as_in_if1_desc = {
+ .bLength = sizeof std_as_in_if1_desc,
+ .bDescriptorType = USB_DT_INTERFACE,
+
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+ .bInterfaceProtocol = UAC_VERSION_2,
+};
+
+/* Audio Stream IN Intface Desc */
+static struct uac2_as_header_descriptor as_in_hdr_desc = {
+ .bLength = sizeof as_in_hdr_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+
+ .bDescriptorSubtype = UAC_AS_GENERAL,
+ /* .bTerminalLink = DYNAMIC */
+ .bmControls = 0,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+ .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
+ .iChannelNames = 0,
+};
+
+/* Audio USB_IN Format */
+static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
+ .bLength = sizeof as_in_fmt1_desc,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FORMAT_TYPE,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+};
+
+/* STD AS ISO IN Endpoint */
+static struct usb_endpoint_descriptor fs_epin_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
+ /* .wMaxPacketSize = DYNAMIC */
+ .bInterval = 1,
+};
+
+static struct usb_endpoint_descriptor hs_epin_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
+ /* .wMaxPacketSize = DYNAMIC */
+ /* .bInterval = DYNAMIC */
+};
+
+static struct usb_endpoint_descriptor ss_epin_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
+ /* .wMaxPacketSize = DYNAMIC */
+ /* .bInterval = DYNAMIC */
+};
+
+static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
+ .bLength = sizeof(ss_epin_desc_comp),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .bMaxBurst = 0,
+ .bmAttributes = 0,
+ /* wBytesPerInterval = DYNAMIC */
+};
+
+/* CS AS ISO IN Endpoint */
+static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
+ .bLength = sizeof as_iso_in_desc,
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+
+ .bDescriptorSubtype = UAC_EP_GENERAL,
+ .bmAttributes = 0,
+ .bmControls = 0,
+ .bLockDelayUnits = 0,
+ .wLockDelay = 0,
+};
+
+static struct usb_descriptor_header *fs_audio_desc[] = {
+ (struct usb_descriptor_header *)&iad_desc,
+ (struct usb_descriptor_header *)&std_ac_if_desc,
+
+ (struct usb_descriptor_header *)&ac_hdr_desc,
+ (struct usb_descriptor_header *)&in_clk_src_desc,
+ (struct usb_descriptor_header *)&out_clk_src_desc,
+ (struct usb_descriptor_header *)&usb_out_it_desc,
+ (struct usb_descriptor_header *)&out_feature_unit_desc,
+ (struct usb_descriptor_header *)&io_in_it_desc,
+ (struct usb_descriptor_header *)&usb_in_ot_desc,
+ (struct usb_descriptor_header *)&in_feature_unit_desc,
+ (struct usb_descriptor_header *)&io_out_ot_desc,
+
+ (struct usb_descriptor_header *)&fs_ep_int_desc,
+
+ (struct usb_descriptor_header *)&std_as_out_if0_desc,
+ (struct usb_descriptor_header *)&std_as_out_if1_desc,
+
+ (struct usb_descriptor_header *)&as_out_hdr_desc,
+ (struct usb_descriptor_header *)&as_out_fmt1_desc,
+ (struct usb_descriptor_header *)&fs_epout_desc,
+ (struct usb_descriptor_header *)&as_iso_out_desc,
+ (struct usb_descriptor_header *)&fs_epin_fback_desc,
+
+ (struct usb_descriptor_header *)&std_as_in_if0_desc,
+ (struct usb_descriptor_header *)&std_as_in_if1_desc,
+
+ (struct usb_descriptor_header *)&as_in_hdr_desc,
+ (struct usb_descriptor_header *)&as_in_fmt1_desc,
+ (struct usb_descriptor_header *)&fs_epin_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_audio_desc[] = {
+ (struct usb_descriptor_header *)&iad_desc,
+ (struct usb_descriptor_header *)&std_ac_if_desc,
+
+ (struct usb_descriptor_header *)&ac_hdr_desc,
+ (struct usb_descriptor_header *)&in_clk_src_desc,
+ (struct usb_descriptor_header *)&out_clk_src_desc,
+ (struct usb_descriptor_header *)&usb_out_it_desc,
+ (struct usb_descriptor_header *)&out_feature_unit_desc,
+ (struct usb_descriptor_header *)&io_in_it_desc,
+ (struct usb_descriptor_header *)&usb_in_ot_desc,
+ (struct usb_descriptor_header *)&in_feature_unit_desc,
+ (struct usb_descriptor_header *)&io_out_ot_desc,
+
+ (struct usb_descriptor_header *)&hs_ep_int_desc,
+
+ (struct usb_descriptor_header *)&std_as_out_if0_desc,
+ (struct usb_descriptor_header *)&std_as_out_if1_desc,
+
+ (struct usb_descriptor_header *)&as_out_hdr_desc,
+ (struct usb_descriptor_header *)&as_out_fmt1_desc,
+ (struct usb_descriptor_header *)&hs_epout_desc,
+ (struct usb_descriptor_header *)&as_iso_out_desc,
+ (struct usb_descriptor_header *)&hs_epin_fback_desc,
+
+ (struct usb_descriptor_header *)&std_as_in_if0_desc,
+ (struct usb_descriptor_header *)&std_as_in_if1_desc,
+
+ (struct usb_descriptor_header *)&as_in_hdr_desc,
+ (struct usb_descriptor_header *)&as_in_fmt1_desc,
+ (struct usb_descriptor_header *)&hs_epin_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *ss_audio_desc[] = {
+ (struct usb_descriptor_header *)&iad_desc,
+ (struct usb_descriptor_header *)&std_ac_if_desc,
+
+ (struct usb_descriptor_header *)&ac_hdr_desc,
+ (struct usb_descriptor_header *)&in_clk_src_desc,
+ (struct usb_descriptor_header *)&out_clk_src_desc,
+ (struct usb_descriptor_header *)&usb_out_it_desc,
+ (struct usb_descriptor_header *)&out_feature_unit_desc,
+ (struct usb_descriptor_header *)&io_in_it_desc,
+ (struct usb_descriptor_header *)&usb_in_ot_desc,
+ (struct usb_descriptor_header *)&in_feature_unit_desc,
+ (struct usb_descriptor_header *)&io_out_ot_desc,
+
+ (struct usb_descriptor_header *)&ss_ep_int_desc,
+ (struct usb_descriptor_header *)&ss_ep_int_desc_comp,
+
+ (struct usb_descriptor_header *)&std_as_out_if0_desc,
+ (struct usb_descriptor_header *)&std_as_out_if1_desc,
+
+ (struct usb_descriptor_header *)&as_out_hdr_desc,
+ (struct usb_descriptor_header *)&as_out_fmt1_desc,
+ (struct usb_descriptor_header *)&ss_epout_desc,
+ (struct usb_descriptor_header *)&ss_epout_desc_comp,
+ (struct usb_descriptor_header *)&as_iso_out_desc,
+ (struct usb_descriptor_header *)&ss_epin_fback_desc,
+ (struct usb_descriptor_header *)&ss_epin_fback_desc_comp,
+
+ (struct usb_descriptor_header *)&std_as_in_if0_desc,
+ (struct usb_descriptor_header *)&std_as_in_if1_desc,
+
+ (struct usb_descriptor_header *)&as_in_hdr_desc,
+ (struct usb_descriptor_header *)&as_in_fmt1_desc,
+ (struct usb_descriptor_header *)&ss_epin_desc,
+ (struct usb_descriptor_header *)&ss_epin_desc_comp,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+struct cntrl_cur_lay2 {
+ __le16 wCUR;
+};
+
+struct cntrl_range_lay2 {
+ __le16 wNumSubRanges;
+ __le16 wMIN;
+ __le16 wMAX;
+ __le16 wRES;
+} __packed;
+
+struct cntrl_cur_lay3 {
+ __le32 dCUR;
+};
+
+struct cntrl_subrange_lay3 {
+ __le32 dMIN;
+ __le32 dMAX;
+ __le32 dRES;
+} __packed;
+
+#define ranges_lay3_size(c) (sizeof(c.wNumSubRanges) \
+ + le16_to_cpu(c.wNumSubRanges) \
+ * sizeof(struct cntrl_subrange_lay3))
+
+#define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n) \
+ struct cntrl_ranges_lay3_##k { \
+ __le16 wNumSubRanges; \
+ struct cntrl_subrange_lay3 r[n]; \
+} __packed
+
+DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES);
+
+static int get_max_srate(const int *srates)
+{
+ int i, max_srate = 0;
+
+ for (i = 0; i < UAC_MAX_RATES; i++) {
+ if (srates[i] == 0)
+ break;
+ if (srates[i] > max_srate)
+ max_srate = srates[i];
+ }
+ return max_srate;
+}
+
+static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts,
+ u8 bint, unsigned int factor, bool is_playback)
+{
+ int chmask, srate, ssize;
+ u16 max_size_bw;
+
+ if (is_playback) {
+ chmask = uac2_opts->p_chmask;
+ srate = get_max_srate(uac2_opts->p_srates);
+ ssize = uac2_opts->p_ssize;
+ } else {
+ chmask = uac2_opts->c_chmask;
+ srate = get_max_srate(uac2_opts->c_srates);
+ ssize = uac2_opts->c_ssize;
+ }
+
+ if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) {
+ // playback is always async, capture only when configured
+ // Win10 requires max packet size + 1 frame
+ srate = srate * (1000 + uac2_opts->fb_max) / 1000;
+ // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1
+ max_size_bw = num_channels(chmask) * ssize *
+ (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))));
+ } else {
+ // adding 1 frame provision for Win10
+ max_size_bw = num_channels(chmask) * ssize *
+ (DIV_ROUND_UP(srate, factor / (1 << (bint - 1))) + 1);
+ }
+ return max_size_bw;
+}
+
+static int set_ep_max_packet_size_bint(struct device *dev, const struct f_uac2_opts *uac2_opts,
+ struct usb_endpoint_descriptor *ep_desc,
+ enum usb_device_speed speed, bool is_playback)
+{
+ u16 max_size_bw, max_size_ep;
+ u8 bint, opts_bint;
+ char *dir;
+
+ switch (speed) {
+ case USB_SPEED_FULL:
+ max_size_ep = 1023;
+ // fixed
+ bint = ep_desc->bInterval;
+ max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 1000, is_playback);
+ break;
+
+ case USB_SPEED_HIGH:
+ case USB_SPEED_SUPER:
+ max_size_ep = 1024;
+ if (is_playback)
+ opts_bint = uac2_opts->p_hs_bint;
+ else
+ opts_bint = uac2_opts->c_hs_bint;
+
+ if (opts_bint > 0) {
+ /* fixed bint */
+ bint = opts_bint;
+ max_size_bw = get_max_bw_for_bint(uac2_opts, bint, 8000, is_playback);
+ } else {
+ /* checking bInterval from 4 to 1 whether the required bandwidth fits */
+ for (bint = 4; bint > 0; --bint) {
+ max_size_bw = get_max_bw_for_bint(
+ uac2_opts, bint, 8000, is_playback);
+ if (max_size_bw <= max_size_ep)
+ break;
+ }
+ }
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (is_playback)
+ dir = "Playback";
+ else
+ dir = "Capture";
+
+ if (max_size_bw <= max_size_ep)
+ dev_dbg(dev,
+ "%s %s: Would use wMaxPacketSize %d and bInterval %d\n",
+ speed_names[speed], dir, max_size_bw, bint);
+ else {
+ dev_warn(dev,
+ "%s %s: Req. wMaxPacketSize %d at bInterval %d > max ISOC %d, may drop data!\n",
+ speed_names[speed], dir, max_size_bw, bint, max_size_ep);
+ max_size_bw = max_size_ep;
+ }
+
+ ep_desc->wMaxPacketSize = cpu_to_le16(max_size_bw);
+ ep_desc->bInterval = bint;
+
+ return 0;
+}
+
+static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
+{
+ struct uac2_feature_unit_descriptor *fu_desc;
+ int channels = num_channels(chmask);
+ int fu_desc_size = UAC2_DT_FEATURE_UNIT_SIZE(channels);
+
+ fu_desc = kzalloc(fu_desc_size, GFP_KERNEL);
+ if (!fu_desc)
+ return NULL;
+
+ fu_desc->bLength = fu_desc_size;
+ fu_desc->bDescriptorType = USB_DT_CS_INTERFACE;
+
+ fu_desc->bDescriptorSubtype = UAC_FEATURE_UNIT;
+
+ /* bUnitID, bSourceID and bmaControls will be defined later */
+
+ return fu_desc;
+}
+
+/* Use macro to overcome line length limitation */
+#define USBDHDR(p) (struct usb_descriptor_header *)(p)
+
+static void setup_headers(struct f_uac2_opts *opts,
+ struct usb_descriptor_header **headers,
+ enum usb_device_speed speed)
+{
+ struct usb_ss_ep_comp_descriptor *epout_desc_comp = NULL;
+ struct usb_ss_ep_comp_descriptor *epin_desc_comp = NULL;
+ struct usb_ss_ep_comp_descriptor *epin_fback_desc_comp = NULL;
+ struct usb_ss_ep_comp_descriptor *ep_int_desc_comp = NULL;
+ struct usb_endpoint_descriptor *epout_desc;
+ struct usb_endpoint_descriptor *epin_desc;
+ struct usb_endpoint_descriptor *epin_fback_desc;
+ struct usb_endpoint_descriptor *ep_int_desc;
+ int i;
+
+ switch (speed) {
+ case USB_SPEED_FULL:
+ epout_desc = &fs_epout_desc;
+ epin_desc = &fs_epin_desc;
+ epin_fback_desc = &fs_epin_fback_desc;
+ ep_int_desc = &fs_ep_int_desc;
+ break;
+ case USB_SPEED_HIGH:
+ epout_desc = &hs_epout_desc;
+ epin_desc = &hs_epin_desc;
+ epin_fback_desc = &hs_epin_fback_desc;
+ ep_int_desc = &hs_ep_int_desc;
+ break;
+ default:
+ epout_desc = &ss_epout_desc;
+ epin_desc = &ss_epin_desc;
+ epout_desc_comp = &ss_epout_desc_comp;
+ epin_desc_comp = &ss_epin_desc_comp;
+ epin_fback_desc = &ss_epin_fback_desc;
+ epin_fback_desc_comp = &ss_epin_fback_desc_comp;
+ ep_int_desc = &ss_ep_int_desc;
+ ep_int_desc_comp = &ss_ep_int_desc_comp;
+ }
+
+ i = 0;
+ headers[i++] = USBDHDR(&iad_desc);
+ headers[i++] = USBDHDR(&std_ac_if_desc);
+ headers[i++] = USBDHDR(&ac_hdr_desc);
+ if (EPIN_EN(opts))
+ headers[i++] = USBDHDR(&in_clk_src_desc);
+ if (EPOUT_EN(opts)) {
+ headers[i++] = USBDHDR(&out_clk_src_desc);
+ headers[i++] = USBDHDR(&usb_out_it_desc);
+
+ if (FUOUT_EN(opts))
+ headers[i++] = USBDHDR(out_feature_unit_desc);
+ }
+
+ if (EPIN_EN(opts)) {
+ headers[i++] = USBDHDR(&io_in_it_desc);
+
+ if (FUIN_EN(opts))
+ headers[i++] = USBDHDR(in_feature_unit_desc);
+
+ headers[i++] = USBDHDR(&usb_in_ot_desc);
+ }
+
+ if (EPOUT_EN(opts))
+ headers[i++] = USBDHDR(&io_out_ot_desc);
+
+ if (FUOUT_EN(opts) || FUIN_EN(opts)) {
+ headers[i++] = USBDHDR(ep_int_desc);
+ if (ep_int_desc_comp)
+ headers[i++] = USBDHDR(ep_int_desc_comp);
+ }
+
+ if (EPOUT_EN(opts)) {
+ headers[i++] = USBDHDR(&std_as_out_if0_desc);
+ headers[i++] = USBDHDR(&std_as_out_if1_desc);
+ headers[i++] = USBDHDR(&as_out_hdr_desc);
+ headers[i++] = USBDHDR(&as_out_fmt1_desc);
+ headers[i++] = USBDHDR(epout_desc);
+ if (epout_desc_comp)
+ headers[i++] = USBDHDR(epout_desc_comp);
+
+ headers[i++] = USBDHDR(&as_iso_out_desc);
+
+ if (EPOUT_FBACK_IN_EN(opts)) {
+ headers[i++] = USBDHDR(epin_fback_desc);
+ if (epin_fback_desc_comp)
+ headers[i++] = USBDHDR(epin_fback_desc_comp);
+ }
+ }
+
+ if (EPIN_EN(opts)) {
+ headers[i++] = USBDHDR(&std_as_in_if0_desc);
+ headers[i++] = USBDHDR(&std_as_in_if1_desc);
+ headers[i++] = USBDHDR(&as_in_hdr_desc);
+ headers[i++] = USBDHDR(&as_in_fmt1_desc);
+ headers[i++] = USBDHDR(epin_desc);
+ if (epin_desc_comp)
+ headers[i++] = USBDHDR(epin_desc_comp);
+
+ headers[i++] = USBDHDR(&as_iso_in_desc);
+ }
+ headers[i] = NULL;
+}
+
+static void setup_descriptor(struct f_uac2_opts *opts)
+{
+ /* patch descriptors */
+ int i = 1; /* ID's start with 1 */
+
+ if (EPOUT_EN(opts))
+ usb_out_it_desc.bTerminalID = i++;
+ if (EPIN_EN(opts))
+ io_in_it_desc.bTerminalID = i++;
+ if (EPOUT_EN(opts))
+ io_out_ot_desc.bTerminalID = i++;
+ if (EPIN_EN(opts))
+ usb_in_ot_desc.bTerminalID = i++;
+ if (FUOUT_EN(opts))
+ out_feature_unit_desc->bUnitID = i++;
+ if (FUIN_EN(opts))
+ in_feature_unit_desc->bUnitID = i++;
+ if (EPOUT_EN(opts))
+ out_clk_src_desc.bClockID = i++;
+ if (EPIN_EN(opts))
+ in_clk_src_desc.bClockID = i++;
+
+ usb_out_it_desc.bCSourceID = out_clk_src_desc.bClockID;
+
+ if (FUIN_EN(opts)) {
+ usb_in_ot_desc.bSourceID = in_feature_unit_desc->bUnitID;
+ in_feature_unit_desc->bSourceID = io_in_it_desc.bTerminalID;
+ } else {
+ usb_in_ot_desc.bSourceID = io_in_it_desc.bTerminalID;
+ }
+
+ usb_in_ot_desc.bCSourceID = in_clk_src_desc.bClockID;
+ io_in_it_desc.bCSourceID = in_clk_src_desc.bClockID;
+ io_out_ot_desc.bCSourceID = out_clk_src_desc.bClockID;
+
+ if (FUOUT_EN(opts)) {
+ io_out_ot_desc.bSourceID = out_feature_unit_desc->bUnitID;
+ out_feature_unit_desc->bSourceID = usb_out_it_desc.bTerminalID;
+ } else {
+ io_out_ot_desc.bSourceID = usb_out_it_desc.bTerminalID;
+ }
+
+ as_out_hdr_desc.bTerminalLink = usb_out_it_desc.bTerminalID;
+ as_in_hdr_desc.bTerminalLink = usb_in_ot_desc.bTerminalID;
+
+ iad_desc.bInterfaceCount = 1;
+ ac_hdr_desc.wTotalLength = cpu_to_le16(sizeof(ac_hdr_desc));
+
+ if (EPIN_EN(opts)) {
+ u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
+
+ len += sizeof(in_clk_src_desc);
+ len += sizeof(usb_in_ot_desc);
+
+ if (FUIN_EN(opts))
+ len += in_feature_unit_desc->bLength;
+
+ len += sizeof(io_in_it_desc);
+ ac_hdr_desc.wTotalLength = cpu_to_le16(len);
+ iad_desc.bInterfaceCount++;
+ }
+ if (EPOUT_EN(opts)) {
+ u16 len = le16_to_cpu(ac_hdr_desc.wTotalLength);
+
+ len += sizeof(out_clk_src_desc);
+ len += sizeof(usb_out_it_desc);
+
+ if (FUOUT_EN(opts))
+ len += out_feature_unit_desc->bLength;
+
+ len += sizeof(io_out_ot_desc);
+ ac_hdr_desc.wTotalLength = cpu_to_le16(len);
+ iad_desc.bInterfaceCount++;
+ }
+
+ setup_headers(opts, fs_audio_desc, USB_SPEED_FULL);
+ setup_headers(opts, hs_audio_desc, USB_SPEED_HIGH);
+ setup_headers(opts, ss_audio_desc, USB_SPEED_SUPER);
+}
+
+static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
+{
+ struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
+ const char *msg = NULL;
+
+ if (!opts->p_chmask && !opts->c_chmask)
+ msg = "no playback and capture channels";
+ else if (opts->p_chmask & ~UAC2_CHANNEL_MASK)
+ msg = "unsupported playback channels mask";
+ else if (opts->c_chmask & ~UAC2_CHANNEL_MASK)
+ msg = "unsupported capture channels mask";
+ else if ((opts->p_ssize < 1) || (opts->p_ssize > 4))
+ msg = "incorrect playback sample size";
+ else if ((opts->c_ssize < 1) || (opts->c_ssize > 4))
+ msg = "incorrect capture sample size";
+ else if (!opts->p_srates[0])
+ msg = "incorrect playback sampling rate";
+ else if (!opts->c_srates[0])
+ msg = "incorrect capture sampling rate";
+
+ else if (opts->p_volume_max <= opts->p_volume_min)
+ msg = "incorrect playback volume max/min";
+ else if (opts->c_volume_max <= opts->c_volume_min)
+ msg = "incorrect capture volume max/min";
+ else if (opts->p_volume_res <= 0)
+ msg = "negative/zero playback volume resolution";
+ else if (opts->c_volume_res <= 0)
+ msg = "negative/zero capture volume resolution";
+
+ else if ((opts->p_volume_max - opts->p_volume_min) % opts->p_volume_res)
+ msg = "incorrect playback volume resolution";
+ else if ((opts->c_volume_max - opts->c_volume_min) % opts->c_volume_res)
+ msg = "incorrect capture volume resolution";
+
+ else if ((opts->p_hs_bint < 0) || (opts->p_hs_bint > 4))
+ msg = "incorrect playback HS/SS bInterval (1-4: fixed, 0: auto)";
+ else if ((opts->c_hs_bint < 0) || (opts->c_hs_bint > 4))
+ msg = "incorrect capture HS/SS bInterval (1-4: fixed, 0: auto)";
+
+ if (msg) {
+ dev_err(dev, "Error: %s\n", msg);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int
+afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
+{
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct usb_composite_dev *cdev = cfg->cdev;
+ struct usb_gadget *gadget = cdev->gadget;
+ struct device *dev = &gadget->dev;
+ struct f_uac2_opts *uac2_opts = g_audio_to_uac2_opts(agdev);
+ struct usb_string *us;
+ int ret;
+
+ ret = afunc_validate_opts(agdev, dev);
+ if (ret)
+ return ret;
+
+ strings_fn[STR_ASSOC].s = uac2_opts->function_name;
+
+ us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
+ if (IS_ERR(us))
+ return PTR_ERR(us);
+
+ if (FUOUT_EN(uac2_opts)) {
+ out_feature_unit_desc = build_fu_desc(uac2_opts->c_chmask);
+ if (!out_feature_unit_desc)
+ return -ENOMEM;
+ }
+ if (FUIN_EN(uac2_opts)) {
+ in_feature_unit_desc = build_fu_desc(uac2_opts->p_chmask);
+ if (!in_feature_unit_desc) {
+ ret = -ENOMEM;
+ goto err_free_fu;
+ }
+ }
+
+ iad_desc.iFunction = us[STR_ASSOC].id;
+ std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
+ in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
+ out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
+ usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
+ io_in_it_desc.iTerminal = us[STR_IO_IT].id;
+ usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
+ io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
+ std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
+ std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
+ std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
+ std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
+
+ if (FUOUT_EN(uac2_opts)) {
+ u8 *i_feature = (u8 *)out_feature_unit_desc +
+ out_feature_unit_desc->bLength - 1;
+ *i_feature = us[STR_FU_OUT].id;
+ }
+ if (FUIN_EN(uac2_opts)) {
+ u8 *i_feature = (u8 *)in_feature_unit_desc +
+ in_feature_unit_desc->bLength - 1;
+ *i_feature = us[STR_FU_IN].id;
+ }
+
+
+ /* Initialize the configurable parameters */
+ usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
+ usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
+ io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
+ io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
+ as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
+ as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
+ as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
+ as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
+ as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
+ as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
+ as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
+ as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
+ if (FUOUT_EN(uac2_opts)) {
+ __le32 *bma = (__le32 *)&out_feature_unit_desc->bmaControls[0];
+ u32 control = 0;
+
+ if (uac2_opts->c_mute_present)
+ control |= CONTROL_RDWR << FU_MUTE_CTRL;
+ if (uac2_opts->c_volume_present)
+ control |= CONTROL_RDWR << FU_VOL_CTRL;
+ *bma = cpu_to_le32(control);
+ }
+ if (FUIN_EN(uac2_opts)) {
+ __le32 *bma = (__le32 *)&in_feature_unit_desc->bmaControls[0];
+ u32 control = 0;
+
+ if (uac2_opts->p_mute_present)
+ control |= CONTROL_RDWR << FU_MUTE_CTRL;
+ if (uac2_opts->p_volume_present)
+ control |= CONTROL_RDWR << FU_VOL_CTRL;
+ *bma = cpu_to_le32(control);
+ }
+
+ ret = usb_interface_id(cfg, fn);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ goto err_free_fu;
+ }
+ iad_desc.bFirstInterface = ret;
+
+ std_ac_if_desc.bInterfaceNumber = ret;
+ uac2->ac_intf = ret;
+ uac2->ac_alt = 0;
+
+ if (EPOUT_EN(uac2_opts)) {
+ ret = usb_interface_id(cfg, fn);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ goto err_free_fu;
+ }
+ std_as_out_if0_desc.bInterfaceNumber = ret;
+ std_as_out_if1_desc.bInterfaceNumber = ret;
+ std_as_out_if1_desc.bNumEndpoints = 1;
+ uac2->as_out_intf = ret;
+ uac2->as_out_alt = 0;
+
+ if (EPOUT_FBACK_IN_EN(uac2_opts)) {
+ fs_epout_desc.bmAttributes =
+ USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
+ hs_epout_desc.bmAttributes =
+ USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
+ ss_epout_desc.bmAttributes =
+ USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC;
+ std_as_out_if1_desc.bNumEndpoints++;
+ } else {
+ fs_epout_desc.bmAttributes =
+ USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
+ hs_epout_desc.bmAttributes =
+ USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
+ ss_epout_desc.bmAttributes =
+ USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ADAPTIVE;
+ }
+ }
+
+ if (EPIN_EN(uac2_opts)) {
+ ret = usb_interface_id(cfg, fn);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ goto err_free_fu;
+ }
+ std_as_in_if0_desc.bInterfaceNumber = ret;
+ std_as_in_if1_desc.bInterfaceNumber = ret;
+ uac2->as_in_intf = ret;
+ uac2->as_in_alt = 0;
+ }
+
+ if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts)) {
+ uac2->int_ep = usb_ep_autoconfig(gadget, &fs_ep_int_desc);
+ if (!uac2->int_ep) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ ret = -ENODEV;
+ goto err_free_fu;
+ }
+
+ std_ac_if_desc.bNumEndpoints = 1;
+ }
+
+ hs_epin_desc.bInterval = uac2_opts->p_hs_bint;
+ ss_epin_desc.bInterval = uac2_opts->p_hs_bint;
+ hs_epout_desc.bInterval = uac2_opts->c_hs_bint;
+ ss_epout_desc.bInterval = uac2_opts->c_hs_bint;
+
+ /* Calculate wMaxPacketSize according to audio bandwidth */
+ ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epin_desc,
+ USB_SPEED_FULL, true);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size_bint(dev, uac2_opts, &fs_epout_desc,
+ USB_SPEED_FULL, false);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epin_desc,
+ USB_SPEED_HIGH, true);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size_bint(dev, uac2_opts, &hs_epout_desc,
+ USB_SPEED_HIGH, false);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epin_desc,
+ USB_SPEED_SUPER, true);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ ret = set_ep_max_packet_size_bint(dev, uac2_opts, &ss_epout_desc,
+ USB_SPEED_SUPER, false);
+ if (ret < 0) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return ret;
+ }
+
+ if (EPOUT_EN(uac2_opts)) {
+ agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
+ if (!agdev->out_ep) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ ret = -ENODEV;
+ goto err_free_fu;
+ }
+ if (EPOUT_FBACK_IN_EN(uac2_opts)) {
+ agdev->in_ep_fback = usb_ep_autoconfig(gadget,
+ &fs_epin_fback_desc);
+ if (!agdev->in_ep_fback) {
+ dev_err(dev, "%s:%d Error!\n",
+ __func__, __LINE__);
+ ret = -ENODEV;
+ goto err_free_fu;
+ }
+ }
+ }
+
+ if (EPIN_EN(uac2_opts)) {
+ agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
+ if (!agdev->in_ep) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ ret = -ENODEV;
+ goto err_free_fu;
+ }
+ }
+
+ agdev->in_ep_maxpsize = max_t(u16,
+ le16_to_cpu(fs_epin_desc.wMaxPacketSize),
+ le16_to_cpu(hs_epin_desc.wMaxPacketSize));
+ agdev->out_ep_maxpsize = max_t(u16,
+ le16_to_cpu(fs_epout_desc.wMaxPacketSize),
+ le16_to_cpu(hs_epout_desc.wMaxPacketSize));
+
+ agdev->in_ep_maxpsize = max_t(u16, agdev->in_ep_maxpsize,
+ le16_to_cpu(ss_epin_desc.wMaxPacketSize));
+ agdev->out_ep_maxpsize = max_t(u16, agdev->out_ep_maxpsize,
+ le16_to_cpu(ss_epout_desc.wMaxPacketSize));
+
+ ss_epin_desc_comp.wBytesPerInterval = ss_epin_desc.wMaxPacketSize;
+ ss_epout_desc_comp.wBytesPerInterval = ss_epout_desc.wMaxPacketSize;
+
+ // HS and SS endpoint addresses are copied from autoconfigured FS descriptors
+ hs_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
+ hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
+ hs_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
+ hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
+ ss_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
+ ss_epin_fback_desc.bEndpointAddress = fs_epin_fback_desc.bEndpointAddress;
+ ss_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
+ ss_ep_int_desc.bEndpointAddress = fs_ep_int_desc.bEndpointAddress;
+
+ setup_descriptor(uac2_opts);
+
+ ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, ss_audio_desc,
+ ss_audio_desc);
+ if (ret)
+ goto err_free_fu;
+
+ agdev->gadget = gadget;
+
+ agdev->params.p_chmask = uac2_opts->p_chmask;
+ memcpy(agdev->params.p_srates, uac2_opts->p_srates,
+ sizeof(agdev->params.p_srates));
+ agdev->params.p_ssize = uac2_opts->p_ssize;
+ if (FUIN_EN(uac2_opts)) {
+ agdev->params.p_fu.id = USB_IN_FU_ID;
+ agdev->params.p_fu.mute_present = uac2_opts->p_mute_present;
+ agdev->params.p_fu.volume_present = uac2_opts->p_volume_present;
+ agdev->params.p_fu.volume_min = uac2_opts->p_volume_min;
+ agdev->params.p_fu.volume_max = uac2_opts->p_volume_max;
+ agdev->params.p_fu.volume_res = uac2_opts->p_volume_res;
+ }
+ agdev->params.c_chmask = uac2_opts->c_chmask;
+ memcpy(agdev->params.c_srates, uac2_opts->c_srates,
+ sizeof(agdev->params.c_srates));
+ agdev->params.c_ssize = uac2_opts->c_ssize;
+ if (FUOUT_EN(uac2_opts)) {
+ agdev->params.c_fu.id = USB_OUT_FU_ID;
+ agdev->params.c_fu.mute_present = uac2_opts->c_mute_present;
+ agdev->params.c_fu.volume_present = uac2_opts->c_volume_present;
+ agdev->params.c_fu.volume_min = uac2_opts->c_volume_min;
+ agdev->params.c_fu.volume_max = uac2_opts->c_volume_max;
+ agdev->params.c_fu.volume_res = uac2_opts->c_volume_res;
+ }
+ agdev->params.req_number = uac2_opts->req_number;
+ agdev->params.fb_max = uac2_opts->fb_max;
+
+ if (FUOUT_EN(uac2_opts) || FUIN_EN(uac2_opts))
+ agdev->notify = afunc_notify;
+
+ ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
+ if (ret)
+ goto err_free_descs;
+
+ return 0;
+
+err_free_descs:
+ usb_free_all_descriptors(fn);
+ agdev->gadget = NULL;
+err_free_fu:
+ kfree(out_feature_unit_desc);
+ out_feature_unit_desc = NULL;
+ kfree(in_feature_unit_desc);
+ in_feature_unit_desc = NULL;
+ return ret;
+}
+
+static void
+afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req)
+{
+ struct g_audio *agdev = req->context;
+ struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
+
+ atomic_dec(&uac2->int_count);
+ kfree(req->buf);
+ usb_ep_free_request(_ep, req);
+}
+
+static int
+afunc_notify(struct g_audio *agdev, int unit_id, int cs)
+{
+ struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
+ struct usb_request *req;
+ struct uac2_interrupt_data_msg *msg;
+ u16 w_index, w_value;
+ int ret;
+
+ if (!uac2->int_ep->enabled)
+ return 0;
+
+ if (atomic_inc_return(&uac2->int_count) > UAC2_DEF_INT_REQ_NUM) {
+ atomic_dec(&uac2->int_count);
+ return 0;
+ }
+
+ req = usb_ep_alloc_request(uac2->int_ep, GFP_ATOMIC);
+ if (req == NULL) {
+ ret = -ENOMEM;
+ goto err_dec_int_count;
+ }
+
+ msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
+ if (msg == NULL) {
+ ret = -ENOMEM;
+ goto err_free_request;
+ }
+
+ w_index = unit_id << 8 | uac2->ac_intf;
+ w_value = cs << 8;
+
+ msg->bInfo = 0; /* Non-vendor, interface interrupt */
+ msg->bAttribute = UAC2_CS_CUR;
+ msg->wIndex = cpu_to_le16(w_index);
+ msg->wValue = cpu_to_le16(w_value);
+
+ req->length = sizeof(*msg);
+ req->buf = msg;
+ req->context = agdev;
+ req->complete = afunc_notify_complete;
+
+ ret = usb_ep_queue(uac2->int_ep, req, GFP_ATOMIC);
+
+ if (ret)
+ goto err_free_msg;
+
+ return 0;
+
+err_free_msg:
+ kfree(msg);
+err_free_request:
+ usb_ep_free_request(uac2->int_ep, req);
+err_dec_int_count:
+ atomic_dec(&uac2->int_count);
+
+ return ret;
+}
+
+static int
+afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
+{
+ struct usb_composite_dev *cdev = fn->config->cdev;
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct usb_gadget *gadget = cdev->gadget;
+ struct device *dev = &gadget->dev;
+ int ret = 0;
+
+ /* No i/f has more than 2 alt settings */
+ if (alt > 1) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+
+ if (intf == uac2->ac_intf) {
+ /* Control I/f has only 1 AltSetting - 0 */
+ if (alt) {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+
+ /* restart interrupt endpoint */
+ if (uac2->int_ep) {
+ usb_ep_disable(uac2->int_ep);
+ config_ep_by_speed(gadget, &agdev->func, uac2->int_ep);
+ usb_ep_enable(uac2->int_ep);
+ }
+
+ return 0;
+ }
+
+ if (intf == uac2->as_out_intf) {
+ uac2->as_out_alt = alt;
+
+ if (alt)
+ ret = u_audio_start_capture(&uac2->g_audio);
+ else
+ u_audio_stop_capture(&uac2->g_audio);
+ } else if (intf == uac2->as_in_intf) {
+ uac2->as_in_alt = alt;
+
+ if (alt)
+ ret = u_audio_start_playback(&uac2->g_audio);
+ else
+ u_audio_stop_playback(&uac2->g_audio);
+ } else {
+ dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int
+afunc_get_alt(struct usb_function *fn, unsigned intf)
+{
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
+
+ if (intf == uac2->ac_intf)
+ return uac2->ac_alt;
+ else if (intf == uac2->as_out_intf)
+ return uac2->as_out_alt;
+ else if (intf == uac2->as_in_intf)
+ return uac2->as_in_alt;
+ else
+ dev_err(&agdev->gadget->dev,
+ "%s:%d Invalid Interface %d!\n",
+ __func__, __LINE__, intf);
+
+ return -EINVAL;
+}
+
+static void
+afunc_disable(struct usb_function *fn)
+{
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+
+ uac2->as_in_alt = 0;
+ uac2->as_out_alt = 0;
+ u_audio_stop_capture(&uac2->g_audio);
+ u_audio_stop_playback(&uac2->g_audio);
+ if (uac2->int_ep)
+ usb_ep_disable(uac2->int_ep);
+}
+
+static void
+afunc_suspend(struct usb_function *fn)
+{
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+
+ u_audio_suspend(&uac2->g_audio);
+}
+
+static int
+in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
+{
+ struct usb_request *req = fn->config->cdev->req;
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
+ u16 w_length = le16_to_cpu(cr->wLength);
+ u16 w_index = le16_to_cpu(cr->wIndex);
+ u16 w_value = le16_to_cpu(cr->wValue);
+ u8 entity_id = (w_index >> 8) & 0xff;
+ u8 control_selector = w_value >> 8;
+ int value = -EOPNOTSUPP;
+ u32 p_srate, c_srate;
+
+ u_audio_get_playback_srate(agdev, &p_srate);
+ u_audio_get_capture_srate(agdev, &c_srate);
+
+ if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
+ if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
+ struct cntrl_cur_lay3 c;
+
+ memset(&c, 0, sizeof(struct cntrl_cur_lay3));
+
+ if (entity_id == USB_IN_CLK_ID)
+ c.dCUR = cpu_to_le32(p_srate);
+ else if (entity_id == USB_OUT_CLK_ID)
+ c.dCUR = cpu_to_le32(c_srate);
+
+ value = min_t(unsigned int, w_length, sizeof(c));
+ memcpy(req->buf, &c, value);
+ } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
+ *(u8 *)req->buf = 1;
+ value = min_t(unsigned int, w_length, 1);
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d control_selector=%d TODO!\n",
+ __func__, __LINE__, control_selector);
+ }
+ } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
+ (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
+ unsigned int is_playback = 0;
+
+ if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
+ is_playback = 1;
+
+ if (control_selector == UAC_FU_MUTE) {
+ unsigned int mute;
+
+ u_audio_get_mute(agdev, is_playback, &mute);
+
+ *(u8 *)req->buf = mute;
+ value = min_t(unsigned int, w_length, 1);
+ } else if (control_selector == UAC_FU_VOLUME) {
+ struct cntrl_cur_lay2 c;
+ s16 volume;
+
+ memset(&c, 0, sizeof(struct cntrl_cur_lay2));
+
+ u_audio_get_volume(agdev, is_playback, &volume);
+ c.wCUR = cpu_to_le16(volume);
+
+ value = min_t(unsigned int, w_length, sizeof(c));
+ memcpy(req->buf, &c, value);
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d control_selector=%d TODO!\n",
+ __func__, __LINE__, control_selector);
+ }
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d entity_id=%d control_selector=%d TODO!\n",
+ __func__, __LINE__, entity_id, control_selector);
+ }
+
+ return value;
+}
+
+static int
+in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
+{
+ struct usb_request *req = fn->config->cdev->req;
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
+ u16 w_length = le16_to_cpu(cr->wLength);
+ u16 w_index = le16_to_cpu(cr->wIndex);
+ u16 w_value = le16_to_cpu(cr->wValue);
+ u8 entity_id = (w_index >> 8) & 0xff;
+ u8 control_selector = w_value >> 8;
+ int value = -EOPNOTSUPP;
+
+ if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
+ if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
+ struct cntrl_ranges_lay3_srates rs;
+ int i;
+ int wNumSubRanges = 0;
+ int srate;
+ int *srates;
+
+ if (entity_id == USB_IN_CLK_ID)
+ srates = opts->p_srates;
+ else if (entity_id == USB_OUT_CLK_ID)
+ srates = opts->c_srates;
+ else
+ return -EOPNOTSUPP;
+ for (i = 0; i < UAC_MAX_RATES; i++) {
+ srate = srates[i];
+ if (srate == 0)
+ break;
+
+ rs.r[wNumSubRanges].dMIN = cpu_to_le32(srate);
+ rs.r[wNumSubRanges].dMAX = cpu_to_le32(srate);
+ rs.r[wNumSubRanges].dRES = 0;
+ wNumSubRanges++;
+ dev_dbg(&agdev->gadget->dev,
+ "%s(): clk %d: rate ID %d: %d\n",
+ __func__, entity_id, wNumSubRanges, srate);
+ }
+ rs.wNumSubRanges = cpu_to_le16(wNumSubRanges);
+ value = min_t(unsigned int, w_length, ranges_lay3_size(rs));
+ dev_dbg(&agdev->gadget->dev, "%s(): sending %d rates, size %d\n",
+ __func__, rs.wNumSubRanges, value);
+ memcpy(req->buf, &rs, value);
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d control_selector=%d TODO!\n",
+ __func__, __LINE__, control_selector);
+ }
+ } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
+ (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
+ unsigned int is_playback = 0;
+
+ if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
+ is_playback = 1;
+
+ if (control_selector == UAC_FU_VOLUME) {
+ struct cntrl_range_lay2 r;
+ s16 max_db, min_db, res_db;
+
+ if (is_playback) {
+ max_db = opts->p_volume_max;
+ min_db = opts->p_volume_min;
+ res_db = opts->p_volume_res;
+ } else {
+ max_db = opts->c_volume_max;
+ min_db = opts->c_volume_min;
+ res_db = opts->c_volume_res;
+ }
+
+ r.wMAX = cpu_to_le16(max_db);
+ r.wMIN = cpu_to_le16(min_db);
+ r.wRES = cpu_to_le16(res_db);
+ r.wNumSubRanges = cpu_to_le16(1);
+
+ value = min_t(unsigned int, w_length, sizeof(r));
+ memcpy(req->buf, &r, value);
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d control_selector=%d TODO!\n",
+ __func__, __LINE__, control_selector);
+ }
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d entity_id=%d control_selector=%d TODO!\n",
+ __func__, __LINE__, entity_id, control_selector);
+ }
+
+ return value;
+}
+
+static int
+ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
+{
+ if (cr->bRequest == UAC2_CS_CUR)
+ return in_rq_cur(fn, cr);
+ else if (cr->bRequest == UAC2_CS_RANGE)
+ return in_rq_range(fn, cr);
+ else
+ return -EOPNOTSUPP;
+}
+
+static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req)
+{
+ struct usb_function *fn = ep->driver_data;
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ u32 val;
+
+ if (req->actual != 4)
+ return;
+
+ val = le32_to_cpu(*((__le32 *)req->buf));
+ dev_dbg(&agdev->gadget->dev, "%s val: %d.\n", __func__, val);
+ if (uac2->clock_id == USB_IN_CLK_ID) {
+ u_audio_set_playback_srate(agdev, val);
+ } else if (uac2->clock_id == USB_OUT_CLK_ID) {
+ u_audio_set_capture_srate(agdev, val);
+ }
+}
+
+static void
+out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct g_audio *agdev = req->context;
+ struct usb_composite_dev *cdev = agdev->func.config->cdev;
+ struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
+ struct f_uac2 *uac2 = func_to_uac2(&agdev->func);
+ struct usb_ctrlrequest *cr = &uac2->setup_cr;
+ u16 w_index = le16_to_cpu(cr->wIndex);
+ u16 w_value = le16_to_cpu(cr->wValue);
+ u8 entity_id = (w_index >> 8) & 0xff;
+ u8 control_selector = w_value >> 8;
+
+ if (req->status != 0) {
+ dev_dbg(&cdev->gadget->dev, "completion err %d\n", req->status);
+ return;
+ }
+
+ if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
+ (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
+ unsigned int is_playback = 0;
+
+ if (FUIN_EN(opts) && (entity_id == USB_IN_FU_ID))
+ is_playback = 1;
+
+ if (control_selector == UAC_FU_MUTE) {
+ u8 mute = *(u8 *)req->buf;
+
+ u_audio_set_mute(agdev, is_playback, mute);
+
+ return;
+ } else if (control_selector == UAC_FU_VOLUME) {
+ struct cntrl_cur_lay2 *c = req->buf;
+ s16 volume;
+
+ volume = le16_to_cpu(c->wCUR);
+ u_audio_set_volume(agdev, is_playback, volume);
+
+ return;
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d control_selector=%d TODO!\n",
+ __func__, __LINE__, control_selector);
+ usb_ep_set_halt(ep);
+ }
+ }
+}
+
+static int
+out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
+{
+ struct usb_composite_dev *cdev = fn->config->cdev;
+ struct usb_request *req = fn->config->cdev->req;
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct f_uac2_opts *opts = g_audio_to_uac2_opts(agdev);
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ u16 w_length = le16_to_cpu(cr->wLength);
+ u16 w_index = le16_to_cpu(cr->wIndex);
+ u16 w_value = le16_to_cpu(cr->wValue);
+ u8 entity_id = (w_index >> 8) & 0xff;
+ u8 control_selector = w_value >> 8;
+ u8 clock_id = w_index >> 8;
+
+ if ((entity_id == USB_IN_CLK_ID) || (entity_id == USB_OUT_CLK_ID)) {
+ if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
+ dev_dbg(&agdev->gadget->dev,
+ "control_selector UAC2_CS_CONTROL_SAM_FREQ, clock: %d\n", clock_id);
+ cdev->gadget->ep0->driver_data = fn;
+ uac2->clock_id = clock_id;
+ req->complete = uac2_cs_control_sam_freq;
+ return w_length;
+ }
+ } else if ((FUIN_EN(opts) && (entity_id == USB_IN_FU_ID)) ||
+ (FUOUT_EN(opts) && (entity_id == USB_OUT_FU_ID))) {
+ memcpy(&uac2->setup_cr, cr, sizeof(*cr));
+ req->context = agdev;
+ req->complete = out_rq_cur_complete;
+
+ return w_length;
+ } else {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d entity_id=%d control_selector=%d TODO!\n",
+ __func__, __LINE__, entity_id, control_selector);
+ }
+ return -EOPNOTSUPP;
+}
+
+static int
+setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
+{
+ struct f_uac2 *uac2 = func_to_uac2(fn);
+ struct g_audio *agdev = func_to_g_audio(fn);
+ u16 w_index = le16_to_cpu(cr->wIndex);
+ u8 intf = w_index & 0xff;
+
+ if (intf != uac2->ac_intf) {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d Error!\n", __func__, __LINE__);
+ return -EOPNOTSUPP;
+ }
+
+ if (cr->bRequestType & USB_DIR_IN)
+ return ac_rq_in(fn, cr);
+ else if (cr->bRequest == UAC2_CS_CUR)
+ return out_rq_cur(fn, cr);
+
+ return -EOPNOTSUPP;
+}
+
+static int
+afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
+{
+ struct usb_composite_dev *cdev = fn->config->cdev;
+ struct g_audio *agdev = func_to_g_audio(fn);
+ struct usb_request *req = cdev->req;
+ u16 w_length = le16_to_cpu(cr->wLength);
+ int value = -EOPNOTSUPP;
+
+ /* Only Class specific requests are supposed to reach here */
+ if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
+ return -EOPNOTSUPP;
+
+ if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
+ value = setup_rq_inf(fn, cr);
+ else
+ dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
+ __func__, __LINE__);
+
+ if (value >= 0) {
+ req->length = value;
+ req->zero = value < w_length;
+ value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+ if (value < 0) {
+ dev_err(&agdev->gadget->dev,
+ "%s:%d Error!\n", __func__, __LINE__);
+ req->status = 0;
+ }
+ }
+
+ return value;
+}
+
+static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct f_uac2_opts,
+ func_inst.group);
+}
+
+static void f_uac2_attr_release(struct config_item *item)
+{
+ struct f_uac2_opts *opts = to_f_uac2_opts(item);
+
+ usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations f_uac2_item_ops = {
+ .release = f_uac2_attr_release,
+};
+
+#define uac2_kstrtou8 kstrtou8
+#define uac2_kstrtou32 kstrtou32
+#define uac2_kstrtos16 kstrtos16
+#define uac2_kstrtobool(s, base, res) kstrtobool((s), (res))
+
+static const char *u8_fmt = "%u\n";
+static const char *u32_fmt = "%u\n";
+static const char *s16_fmt = "%hd\n";
+static const char *bool_fmt = "%u\n";
+
+#define UAC2_ATTRIBUTE(type, name) \
+static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
+ char *page) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int result; \
+ \
+ mutex_lock(&opts->lock); \
+ result = sprintf(page, type##_fmt, opts->name); \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int ret; \
+ type num; \
+ \
+ mutex_lock(&opts->lock); \
+ if (opts->refcnt) { \
+ ret = -EBUSY; \
+ goto end; \
+ } \
+ \
+ ret = uac2_kstrto##type(page, 0, &num); \
+ if (ret) \
+ goto end; \
+ \
+ opts->name = num; \
+ ret = len; \
+ \
+end: \
+ mutex_unlock(&opts->lock); \
+ return ret; \
+} \
+ \
+CONFIGFS_ATTR(f_uac2_opts_, name)
+
+#define UAC2_ATTRIBUTE_SYNC(name) \
+static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
+ char *page) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int result; \
+ char *str; \
+ \
+ mutex_lock(&opts->lock); \
+ switch (opts->name) { \
+ case USB_ENDPOINT_SYNC_ASYNC: \
+ str = "async"; \
+ break; \
+ case USB_ENDPOINT_SYNC_ADAPTIVE: \
+ str = "adaptive"; \
+ break; \
+ default: \
+ str = "unknown"; \
+ break; \
+ } \
+ result = sprintf(page, "%s\n", str); \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int ret = 0; \
+ \
+ mutex_lock(&opts->lock); \
+ if (opts->refcnt) { \
+ ret = -EBUSY; \
+ goto end; \
+ } \
+ \
+ if (!strncmp(page, "async", 5)) \
+ opts->name = USB_ENDPOINT_SYNC_ASYNC; \
+ else if (!strncmp(page, "adaptive", 8)) \
+ opts->name = USB_ENDPOINT_SYNC_ADAPTIVE; \
+ else { \
+ ret = -EINVAL; \
+ goto end; \
+ } \
+ \
+ ret = len; \
+ \
+end: \
+ mutex_unlock(&opts->lock); \
+ return ret; \
+} \
+ \
+CONFIGFS_ATTR(f_uac2_opts_, name)
+
+#define UAC2_RATE_ATTRIBUTE(name) \
+static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
+ char *page) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int result = 0; \
+ int i; \
+ \
+ mutex_lock(&opts->lock); \
+ page[0] = '\0'; \
+ for (i = 0; i < UAC_MAX_RATES; i++) { \
+ if (opts->name##s[i] == 0) \
+ break; \
+ result += sprintf(page + strlen(page), "%u,", \
+ opts->name##s[i]); \
+ } \
+ if (strlen(page) > 0) \
+ page[strlen(page) - 1] = '\n'; \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ char *split_page = NULL; \
+ int ret = -EINVAL; \
+ char *token; \
+ u32 num; \
+ int i; \
+ \
+ mutex_lock(&opts->lock); \
+ if (opts->refcnt) { \
+ ret = -EBUSY; \
+ goto end; \
+ } \
+ \
+ i = 0; \
+ memset(opts->name##s, 0x00, sizeof(opts->name##s)); \
+ split_page = kstrdup(page, GFP_KERNEL); \
+ while ((token = strsep(&split_page, ",")) != NULL) { \
+ ret = kstrtou32(token, 0, &num); \
+ if (ret) \
+ goto end; \
+ \
+ opts->name##s[i++] = num; \
+ ret = len; \
+ }; \
+ \
+end: \
+ kfree(split_page); \
+ mutex_unlock(&opts->lock); \
+ return ret; \
+} \
+ \
+CONFIGFS_ATTR(f_uac2_opts_, name)
+
+#define UAC2_ATTRIBUTE_STRING(name) \
+static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
+ char *page) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int result; \
+ \
+ mutex_lock(&opts->lock); \
+ result = snprintf(page, sizeof(opts->name), "%s", opts->name); \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct f_uac2_opts *opts = to_f_uac2_opts(item); \
+ int ret = 0; \
+ \
+ mutex_lock(&opts->lock); \
+ if (opts->refcnt) { \
+ ret = -EBUSY; \
+ goto end; \
+ } \
+ \
+ ret = snprintf(opts->name, min(sizeof(opts->name), len), \
+ "%s", page); \
+ \
+end: \
+ mutex_unlock(&opts->lock); \
+ return ret; \
+} \
+ \
+CONFIGFS_ATTR(f_uac2_opts_, name)
+
+UAC2_ATTRIBUTE(u32, p_chmask);
+UAC2_RATE_ATTRIBUTE(p_srate);
+UAC2_ATTRIBUTE(u32, p_ssize);
+UAC2_ATTRIBUTE(u8, p_hs_bint);
+UAC2_ATTRIBUTE(u32, c_chmask);
+UAC2_RATE_ATTRIBUTE(c_srate);
+UAC2_ATTRIBUTE_SYNC(c_sync);
+UAC2_ATTRIBUTE(u32, c_ssize);
+UAC2_ATTRIBUTE(u8, c_hs_bint);
+UAC2_ATTRIBUTE(u32, req_number);
+
+UAC2_ATTRIBUTE(bool, p_mute_present);
+UAC2_ATTRIBUTE(bool, p_volume_present);
+UAC2_ATTRIBUTE(s16, p_volume_min);
+UAC2_ATTRIBUTE(s16, p_volume_max);
+UAC2_ATTRIBUTE(s16, p_volume_res);
+
+UAC2_ATTRIBUTE(bool, c_mute_present);
+UAC2_ATTRIBUTE(bool, c_volume_present);
+UAC2_ATTRIBUTE(s16, c_volume_min);
+UAC2_ATTRIBUTE(s16, c_volume_max);
+UAC2_ATTRIBUTE(s16, c_volume_res);
+UAC2_ATTRIBUTE(u32, fb_max);
+UAC2_ATTRIBUTE_STRING(function_name);
+
+static struct configfs_attribute *f_uac2_attrs[] = {
+ &f_uac2_opts_attr_p_chmask,
+ &f_uac2_opts_attr_p_srate,
+ &f_uac2_opts_attr_p_ssize,
+ &f_uac2_opts_attr_p_hs_bint,
+ &f_uac2_opts_attr_c_chmask,
+ &f_uac2_opts_attr_c_srate,
+ &f_uac2_opts_attr_c_ssize,
+ &f_uac2_opts_attr_c_hs_bint,
+ &f_uac2_opts_attr_c_sync,
+ &f_uac2_opts_attr_req_number,
+ &f_uac2_opts_attr_fb_max,
+
+ &f_uac2_opts_attr_p_mute_present,
+ &f_uac2_opts_attr_p_volume_present,
+ &f_uac2_opts_attr_p_volume_min,
+ &f_uac2_opts_attr_p_volume_max,
+ &f_uac2_opts_attr_p_volume_res,
+
+ &f_uac2_opts_attr_c_mute_present,
+ &f_uac2_opts_attr_c_volume_present,
+ &f_uac2_opts_attr_c_volume_min,
+ &f_uac2_opts_attr_c_volume_max,
+ &f_uac2_opts_attr_c_volume_res,
+
+ &f_uac2_opts_attr_function_name,
+
+ NULL,
+};
+
+static const struct config_item_type f_uac2_func_type = {
+ .ct_item_ops = &f_uac2_item_ops,
+ .ct_attrs = f_uac2_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static void afunc_free_inst(struct usb_function_instance *f)
+{
+ struct f_uac2_opts *opts;
+
+ opts = container_of(f, struct f_uac2_opts, func_inst);
+ kfree(opts);
+}
+
+static struct usb_function_instance *afunc_alloc_inst(void)
+{
+ struct f_uac2_opts *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&opts->lock);
+ opts->func_inst.free_func_inst = afunc_free_inst;
+
+ config_group_init_type_name(&opts->func_inst.group, "",
+ &f_uac2_func_type);
+
+ opts->p_chmask = UAC2_DEF_PCHMASK;
+ opts->p_srates[0] = UAC2_DEF_PSRATE;
+ opts->p_ssize = UAC2_DEF_PSSIZE;
+ opts->p_hs_bint = UAC2_DEF_PHSBINT;
+ opts->c_chmask = UAC2_DEF_CCHMASK;
+ opts->c_srates[0] = UAC2_DEF_CSRATE;
+ opts->c_ssize = UAC2_DEF_CSSIZE;
+ opts->c_hs_bint = UAC2_DEF_CHSBINT;
+ opts->c_sync = UAC2_DEF_CSYNC;
+
+ opts->p_mute_present = UAC2_DEF_MUTE_PRESENT;
+ opts->p_volume_present = UAC2_DEF_VOLUME_PRESENT;
+ opts->p_volume_min = UAC2_DEF_MIN_DB;
+ opts->p_volume_max = UAC2_DEF_MAX_DB;
+ opts->p_volume_res = UAC2_DEF_RES_DB;
+
+ opts->c_mute_present = UAC2_DEF_MUTE_PRESENT;
+ opts->c_volume_present = UAC2_DEF_VOLUME_PRESENT;
+ opts->c_volume_min = UAC2_DEF_MIN_DB;
+ opts->c_volume_max = UAC2_DEF_MAX_DB;
+ opts->c_volume_res = UAC2_DEF_RES_DB;
+
+ opts->req_number = UAC2_DEF_REQ_NUM;
+ opts->fb_max = FBACK_FAST_MAX;
+
+ snprintf(opts->function_name, sizeof(opts->function_name), "Source/Sink");
+
+ return &opts->func_inst;
+}
+
+static void afunc_free(struct usb_function *f)
+{
+ struct g_audio *agdev;
+ struct f_uac2_opts *opts;
+
+ agdev = func_to_g_audio(f);
+ opts = container_of(f->fi, struct f_uac2_opts, func_inst);
+ kfree(agdev);
+ mutex_lock(&opts->lock);
+ --opts->refcnt;
+ mutex_unlock(&opts->lock);
+}
+
+static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct g_audio *agdev = func_to_g_audio(f);
+
+ g_audio_cleanup(agdev);
+ usb_free_all_descriptors(f);
+
+ agdev->gadget = NULL;
+
+ kfree(out_feature_unit_desc);
+ out_feature_unit_desc = NULL;
+ kfree(in_feature_unit_desc);
+ in_feature_unit_desc = NULL;
+}
+
+static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
+{
+ struct f_uac2 *uac2;
+ struct f_uac2_opts *opts;
+
+ uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
+ if (uac2 == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ opts = container_of(fi, struct f_uac2_opts, func_inst);
+ mutex_lock(&opts->lock);
+ ++opts->refcnt;
+ mutex_unlock(&opts->lock);
+
+ uac2->g_audio.func.name = "uac2_func";
+ uac2->g_audio.func.bind = afunc_bind;
+ uac2->g_audio.func.unbind = afunc_unbind;
+ uac2->g_audio.func.set_alt = afunc_set_alt;
+ uac2->g_audio.func.get_alt = afunc_get_alt;
+ uac2->g_audio.func.disable = afunc_disable;
+ uac2->g_audio.func.suspend = afunc_suspend;
+ uac2->g_audio.func.setup = afunc_setup;
+ uac2->g_audio.func.free_func = afunc_free;
+
+ return &uac2->g_audio.func;
+}
+
+DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yadwinder Singh");
+MODULE_AUTHOR("Jaswinder Singh");
+MODULE_AUTHOR("Ruslan Bilovol");
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 14:29:31 +0000