usb: gadget: f_uac2: Add HS/SS bInterval to configfs

Allow configuring the HS/SS bInterval through configfs, via
parameters p_hs_bint/c_hs_bint separately for playback/capture.

The default param values are left at the original 4.

Suggested-by: John Keeping <john@metanate.com>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220127114331.41367-2-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uac2 b/Documentation/ABI/testing/configfs-usb-gadget-uac2
index 4c6bf63..33fb237 100644 (file)
--- a/Documentation/ABI/testing/configfs-usb-gadget-uac2
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uac2
@@ -8,6 +8,7 @@ Description:
                c_chmask                capture channel mask
                c_srate                 list of capture sampling rates (comma-separated)
                c_ssize                 capture sample size (bytes)
+               c_hs_bint               capture bInterval for HS/SS (1-4)
                c_sync                  capture synchronization type
                                        (async/adaptive)
                c_mute_present          capture mute control enable
@@ -22,6 +23,7 @@ Description:
                p_chmask                playback channel mask
                p_srate                 list of playback sampling rates (comma-separated)
                p_ssize                 playback sample size (bytes)
+               p_hs_bint               playback bInterval for HS/SS (1-4)
                p_mute_present          playback mute control enable
                p_volume_present        playback volume control enable
                p_volume_min            playback volume control min value

diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst
index 6e8fdfa..bd91191 100644 (file)
--- a/Documentation/usb/gadget-testing.rst
+++ b/Documentation/usb/gadget-testing.rst
@@ -734,6 +734,7 @@ The uac2 function provides these attributes in its function directory:
        c_volume_min     capture volume control min value (in 1/256 dB)
        c_volume_max     capture volume control max value (in 1/256 dB)
        c_volume_res     capture volume control resolution (in 1/256 dB)
+       c_hs_bint        capture bInterval for HS/SS (1-4)
        fb_max           maximum extra bandwidth in async mode
        p_chmask         playback channel mask
        p_srate          list of playback sampling rates (comma-separated)
@@ -743,6 +744,7 @@ The uac2 function provides these attributes in its function directory:
        p_volume_min     playback volume control min value (in 1/256 dB)
        p_volume_max     playback volume control max value (in 1/256 dB)
        p_volume_res     playback volume control resolution (in 1/256 dB)
+       p_hs_bint        playback bInterval for HS/SS (1-4)
        req_number       the number of pre-allocated request for both capture
                         and playback
        function_name    name of the interface

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index d874e0d..34bb6c9 100644 (file)
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -343,7 +343,7 @@ static struct usb_endpoint_descriptor hs_epout_desc = {
 
        /* .bmAttributes = DYNAMIC */
        /* .wMaxPacketSize = DYNAMIC */
-       .bInterval = 4,
+       /* .bInterval = DYNAMIC */
 };
 
 static struct usb_endpoint_descriptor ss_epout_desc = {
@@ -353,7 +353,7 @@ static struct usb_endpoint_descriptor ss_epout_desc = {
        .bEndpointAddress = USB_DIR_OUT,
        /* .bmAttributes = DYNAMIC */
        /* .wMaxPacketSize = DYNAMIC */
-       .bInterval = 4,
+       /* .bInterval = DYNAMIC */
 };
 
 static struct usb_ss_ep_comp_descriptor ss_epout_desc_comp = {
@@ -477,7 +477,7 @@ static struct usb_endpoint_descriptor hs_epin_desc = {
 
        .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
        /* .wMaxPacketSize = DYNAMIC */
-       .bInterval = 4,
+       /* .bInterval = DYNAMIC */
 };
 
 static struct usb_endpoint_descriptor ss_epin_desc = {
@@ -487,7 +487,7 @@ static struct usb_endpoint_descriptor ss_epin_desc = {
        .bEndpointAddress = USB_DIR_IN,
        .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
        /* .wMaxPacketSize = DYNAMIC */
-       .bInterval = 4,
+       /* .bInterval = DYNAMIC */
 };
 
 static struct usb_ss_ep_comp_descriptor ss_epin_desc_comp = {
@@ -965,6 +965,16 @@ static int afunc_validate_opts(struct g_audio *agdev, struct device *dev)
                        return -EINVAL;
        }
 
+       if ((opts->p_hs_bint < 1) || (opts->p_hs_bint > 4)) {
+               dev_err(dev, "Error: incorrect playback HS/SS bInterval (1-4)\n");
+               return -EINVAL;
+       }
+
+       if ((opts->c_hs_bint < 1) || (opts->c_hs_bint > 4)) {
+               dev_err(dev, "Error: incorrect capture HS/SS bInterval (1-4)\n");
+               return -EINVAL;
+       }
+
        return 0;
 }
 
@@ -1125,6 +1135,11 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
                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(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
                                     true);
@@ -1801,10 +1816,12 @@ 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";
@@ -2004,10 +2021,12 @@ 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);
@@ -2028,9 +2047,11 @@ 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,
@@ -2083,9 +2104,11 @@ static struct usb_function_instance *afunc_alloc_inst(void)
        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;

diff --git a/drivers/usb/gadget/function/u_uac2.h b/drivers/usb/gadget/function/u_uac2.h
index ed96c7c..733a0e0 100644 (file)
--- a/drivers/usb/gadget/function/u_uac2.h
+++ b/drivers/usb/gadget/function/u_uac2.h
@@ -19,9 +19,11 @@
 #define UAC2_DEF_PCHMASK 0x3
 #define UAC2_DEF_PSRATE 48000
 #define UAC2_DEF_PSSIZE 2
+#define UAC2_DEF_PHSBINT 4
 #define UAC2_DEF_CCHMASK 0x3
 #define UAC2_DEF_CSRATE 64000
 #define UAC2_DEF_CSSIZE 2
+#define UAC2_DEF_CHSBINT 4
 #define UAC2_DEF_CSYNC         USB_ENDPOINT_SYNC_ASYNC
 
 #define UAC2_DEF_MUTE_PRESENT  1
@@ -38,10 +40,12 @@ struct f_uac2_opts {
        int                             p_chmask;
        int                             p_srates[UAC_MAX_RATES];
        int                             p_ssize;
+       u8                              p_hs_bint;
        int                             c_chmask;
        int                             c_srates[UAC_MAX_RATES];
        int                             c_ssize;
        int                             c_sync;
+       u8                              c_hs_bint;
 
        bool                    p_mute_present;
        bool                    p_volume_present;