diff options
Diffstat (limited to 'drivers/usb/gadget/function/f_uac1.c')
| -rw-r--r-- | drivers/usb/gadget/function/f_uac1.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c index 29efbedc91f9..edbb3b9a9709 100644 --- a/drivers/usb/gadget/function/f_uac1.c +++ b/drivers/usb/gadget/function/f_uac1.c @@ -23,6 +23,9 @@ #include "u_audio.h" #include "u_uac1.h" +/* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */ +#define UAC1_CHANNEL_MASK 0x0FFF + struct f_uac1 { struct g_audio g_audio; u8 ac_intf, as_in_intf, as_out_intf; @@ -34,6 +37,11 @@ static inline struct f_uac1 *func_to_uac1(struct usb_function *f) return container_of(f, struct f_uac1, g_audio.func); } +static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio) +{ + return container_of(audio->func.fi, struct f_uac1_opts, func_inst); +} + /* * DESCRIPTORS ... most are static, but strings and full * configuration descriptors are built on demand. @@ -503,16 +511,48 @@ static void f_audio_disable(struct usb_function *f) uac1->as_out_alt = 0; uac1->as_in_alt = 0; + u_audio_stop_playback(&uac1->g_audio); u_audio_stop_capture(&uac1->g_audio); } /*-------------------------------------------------------------------------*/ +static int f_audio_validate_opts(struct g_audio *audio, struct device *dev) +{ + struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio); + + if (!opts->p_chmask && !opts->c_chmask) { + dev_err(dev, "Error: no playback and capture channels\n"); + return -EINVAL; + } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) { + dev_err(dev, "Error: unsupported playback channels mask\n"); + return -EINVAL; + } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) { + dev_err(dev, "Error: unsupported capture channels mask\n"); + return -EINVAL; + } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) { + dev_err(dev, "Error: incorrect playback sample size\n"); + return -EINVAL; + } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) { + dev_err(dev, "Error: incorrect capture sample size\n"); + return -EINVAL; + } else if (!opts->p_srate) { + dev_err(dev, "Error: incorrect playback sampling rate\n"); + return -EINVAL; + } else if (!opts->c_srate) { + dev_err(dev, "Error: incorrect capture sampling rate\n"); + return -EINVAL; + } + + return 0; +} + /* audio function driver setup/binding */ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) { struct usb_composite_dev *cdev = c->cdev; struct usb_gadget *gadget = cdev->gadget; + struct device *dev = &gadget->dev; struct f_uac1 *uac1 = func_to_uac1(f); struct g_audio *audio = func_to_g_audio(f); struct f_uac1_opts *audio_opts; @@ -522,6 +562,10 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) int rate; int status; + status = f_audio_validate_opts(audio, dev); + if (status) + return status; + audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst); us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1)); |