// SPDX-License-Identifier: GPL-2.0+ /* * f_uac2.c -- USB Audio Class 2.0 Function * * Copyright (C) 2011 * Yadwinder Singh ([email protected]) * Jaswinder Singh ([email protected]) * * Copyright (C) 2020 * Ruslan Bilovol ([email protected]) */ #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 … /* * 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 … #define USB_IN_CLK_ID … #define USB_OUT_FU_ID … #define USB_IN_FU_ID … #define CONTROL_ABSENT … #define CONTROL_RDONLY … #define CONTROL_RDWR … #define CLK_FREQ_CTRL … #define CLK_VLD_CTRL … #define FU_MUTE_CTRL … #define FU_VOL_CTRL … #define COPY_CTRL … #define CONN_CTRL … #define OVRLD_CTRL … #define CLSTR_CTRL … #define UNFLW_CTRL … #define OVFLW_CTRL … #define EPIN_EN(_opts) … #define EPOUT_EN(_opts) … #define FUIN_EN(_opts) … #define FUOUT_EN(_opts) … #define EPOUT_FBACK_IN_EN(_opts) … struct f_uac2 { … }; static inline struct f_uac2 *func_to_uac2(struct usb_function *f) { … } static inline struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev) { … } static int afunc_notify(struct g_audio *agdev, int unit_id, int cs); /* --------- USB Function Interface ------------- */ enum { … }; static struct usb_string strings_fn[NUM_STR_DESCRIPTORS + 1] = …; static const char *const speed_names[] = …; static struct usb_gadget_strings str_fn = …; static struct usb_gadget_strings *fn_strings[] = …; static struct usb_interface_assoc_descriptor iad_desc = …; /* Audio Control Interface */ static struct usb_interface_descriptor std_ac_if_desc = …; /* Clock source for IN traffic */ static struct uac_clock_source_descriptor in_clk_src_desc = …; /* Clock source for OUT traffic */ static struct uac_clock_source_descriptor out_clk_src_desc = …; /* Input Terminal for USB_OUT */ static struct uac2_input_terminal_descriptor usb_out_it_desc = …; /* Input Terminal for I/O-In */ static struct uac2_input_terminal_descriptor io_in_it_desc = …; /* Ouput Terminal for USB_IN */ static struct uac2_output_terminal_descriptor usb_in_ot_desc = …; /* Ouput Terminal for I/O-Out */ static struct uac2_output_terminal_descriptor io_out_ot_desc = …; 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 = …; /* AC IN Interrupt Endpoint */ static struct usb_endpoint_descriptor fs_ep_int_desc = …; static struct usb_endpoint_descriptor hs_ep_int_desc = …; static struct usb_endpoint_descriptor ss_ep_int_desc = …; static struct usb_ss_ep_comp_descriptor ss_ep_int_desc_comp = …; /* Audio Streaming OUT Interface - Alt0 */ static struct usb_interface_descriptor std_as_out_if0_desc = …; /* Audio Streaming OUT Interface - Alt1 */ static struct usb_interface_descriptor std_as_out_if1_desc = …; /* Audio Stream OUT Intface Desc */ static struct uac2_as_header_descriptor as_out_hdr_desc = …; /* Audio USB_OUT Format */ static struct uac2_format_type_i_descriptor as_out_fmt1_desc = …; /* STD AS ISO OUT Endpoint */ static struct usb_endpoint_descriptor fs_epout_desc = …; static struct usb_endpoint_descriptor hs_epout_desc = …; static struct usb_endpoint_descriptor ss_epout_desc = …; static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = …; /* CS AS ISO OUT Endpoint */ static struct uac2_iso_endpoint_descriptor as_iso_out_desc = …; /* STD AS ISO IN Feedback Endpoint */ static struct usb_endpoint_descriptor fs_epin_fback_desc = …; static struct usb_endpoint_descriptor hs_epin_fback_desc = …; static struct usb_endpoint_descriptor ss_epin_fback_desc = …; static struct usb_ss_ep_comp_descriptor ss_epin_fback_desc_comp = …; /* Audio Streaming IN Interface - Alt0 */ static struct usb_interface_descriptor std_as_in_if0_desc = …; /* Audio Streaming IN Interface - Alt1 */ static struct usb_interface_descriptor std_as_in_if1_desc = …; /* Audio Stream IN Intface Desc */ static struct uac2_as_header_descriptor as_in_hdr_desc = …; /* Audio USB_IN Format */ static struct uac2_format_type_i_descriptor as_in_fmt1_desc = …; /* STD AS ISO IN Endpoint */ static struct usb_endpoint_descriptor fs_epin_desc = …; static struct usb_endpoint_descriptor hs_epin_desc = …; static struct usb_endpoint_descriptor ss_epin_desc = …; static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = …; /* CS AS ISO IN Endpoint */ static struct uac2_iso_endpoint_descriptor as_iso_in_desc = …; static struct usb_descriptor_header *fs_audio_desc[] = …; static struct usb_descriptor_header *hs_audio_desc[] = …; static struct usb_descriptor_header *ss_audio_desc[] = …; struct cntrl_cur_lay2 { … }; struct cntrl_range_lay2 { … } __packed; struct cntrl_cur_lay3 { … }; struct cntrl_subrange_lay3 { … } __packed; #define ranges_lay3_size(c) … #define DECLARE_UAC2_CNTRL_RANGES_LAY3(k, n) … DECLARE_UAC2_CNTRL_RANGES_LAY3(srates, UAC_MAX_RATES); static int get_max_srate(const int *srates) { … } static int get_max_bw_for_bint(const struct f_uac2_opts *uac2_opts, u8 bint, unsigned int factor, bool is_playback) { … } 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) { … } static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask) { … } /* Use macro to overcome line length limitation */ #define USBDHDR(p) … static void setup_headers(struct f_uac2_opts *opts, struct usb_descriptor_header **headers, enum usb_device_speed speed) { … } static void setup_descriptor(struct f_uac2_opts *opts) { … } static int afunc_validate_opts(struct g_audio *agdev, struct device *dev) { … } static int afunc_bind(struct usb_configuration *cfg, struct usb_function *fn) { … } static void afunc_notify_complete(struct usb_ep *_ep, struct usb_request *req) { … } static int afunc_notify(struct g_audio *agdev, int unit_id, int cs) { … } static int afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt) { … } static int afunc_get_alt(struct usb_function *fn, unsigned intf) { … } static void afunc_disable(struct usb_function *fn) { … } static void afunc_suspend(struct usb_function *fn) { … } static int in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) { … } static int in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr) { … } static int ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr) { … } static void uac2_cs_control_sam_freq(struct usb_ep *ep, struct usb_request *req) { … } static void out_rq_cur_complete(struct usb_ep *ep, struct usb_request *req) { … } static int out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr) { … } static int setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr) { … } static int afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr) { … } static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item) { … } static void f_uac2_attr_release(struct config_item *item) { … } static struct configfs_item_operations f_uac2_item_ops = …; #define uac2_kstrtou8 … #define uac2_kstrtou32 … #define uac2_kstrtos16 … #define uac2_kstrtobool(s, base, res) … static const char *u8_fmt = …; static const char *u32_fmt = …; static const char *s16_fmt = …; static const char *bool_fmt = …; #define UAC2_ATTRIBUTE(type, name) … #define UAC2_ATTRIBUTE_SYNC(name) … #define UAC2_RATE_ATTRIBUTE(name) … #define UAC2_ATTRIBUTE_STRING(name) … UAC2_ATTRIBUTE(…); UAC2_RATE_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_RATE_ATTRIBUTE(…); UAC2_ATTRIBUTE_SYNC(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE_STRING(…); UAC2_ATTRIBUTE(…); UAC2_ATTRIBUTE(…); static struct configfs_attribute *f_uac2_attrs[] = …; static const struct config_item_type f_uac2_func_type = …; static void afunc_free_inst(struct usb_function_instance *f) { … } static struct usb_function_instance *afunc_alloc_inst(void) { … } static void afunc_free(struct usb_function *f) { … } static void afunc_unbind(struct usb_configuration *c, struct usb_function *f) { … } static struct usb_function *afunc_alloc(struct usb_function_instance *fi) { … } DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc); MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …;
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