// SPDX-License-Identifier: GPL-2.0-or-later /* * Clock domain and sample rate management functions */ #include #include #include #include #include #include #include #include #include #include #include "usbaudio.h" #include "card.h" #include "helper.h" #include "clock.h" #include "quirks.h" union uac23_clock_source_desc { struct uac_clock_source_descriptor v2; struct uac3_clock_source_descriptor v3; }; union uac23_clock_selector_desc { struct uac_clock_selector_descriptor v2; struct uac3_clock_selector_descriptor v3; }; union uac23_clock_multiplier_desc { struct uac_clock_multiplier_descriptor v2; struct uac_clock_multiplier_descriptor v3; }; /* check whether the descriptor bLength has the minimal length */ #define DESC_LENGTH_CHECK(p, proto) \ ((proto) == UAC_VERSION_3 ? \ ((p)->v3.bLength >= sizeof((p)->v3)) : \ ((p)->v2.bLength >= sizeof((p)->v2))) #define GET_VAL(p, proto, field) \ ((proto) == UAC_VERSION_3 ? (p)->v3.field : (p)->v2.field) static void *find_uac_clock_desc(struct usb_host_interface *iface, int id, bool (*validator)(void *, int, int), u8 type, int proto) { void *cs = NULL; while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen, cs, type))) { if (validator(cs, id, proto)) return cs; } return NULL; } static bool validate_clock_source(void *p, int id, int proto) { union uac23_clock_source_desc *cs = p; if (!DESC_LENGTH_CHECK(cs, proto)) return false; return GET_VAL(cs, proto, bClockID) == id; } static bool validate_clock_selector(void *p, int id, int proto) { union uac23_clock_selector_desc *cs = p; if (!DESC_LENGTH_CHECK(cs, proto)) return false; if (GET_VAL(cs, proto, bClockID) != id) return false; /* additional length check for baCSourceID array (in bNrInPins size) * and two more fields (which sizes depend on the protocol) */ if (proto == UAC_VERSION_3) return cs->v3.bLength >= sizeof(cs->v3) + cs->v3.bNrInPins + 4 /* bmControls */ + 2 /* wCSelectorDescrStr */; else return cs->v2.bLength >= sizeof(cs->v2) + cs->v2.bNrInPins + 1 /* bmControls */ + 1 /* iClockSelector */; } static bool validate_clock_multiplier(void *p, int id, int proto) { union uac23_clock_multiplier_desc *cs = p; if (!DESC_LENGTH_CHECK(cs, proto)) return false; return GET_VAL(cs, proto, bClockID) == id; } #define DEFINE_FIND_HELPER(name, obj, validator, type2, type3) \ static obj *name(struct snd_usb_audio *chip, int id, \ const struct audioformat *fmt) \ { \ struct usb_host_interface *ctrl_intf = \ snd_usb_find_ctrl_interface(chip, fmt->iface); \ return find_uac_clock_desc(ctrl_intf, id, validator, \ fmt->protocol == UAC_VERSION_3 ? (type3) : (type2), \ fmt->protocol); \ } DEFINE_FIND_HELPER(snd_usb_find_clock_source, union uac23_clock_source_desc, validate_clock_source, UAC2_CLOCK_SOURCE, UAC3_CLOCK_SOURCE); DEFINE_FIND_HELPER(snd_usb_find_clock_selector, union uac23_clock_selector_desc, validate_clock_selector, UAC2_CLOCK_SELECTOR, UAC3_CLOCK_SELECTOR); DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier, union uac23_clock_multiplier_desc, validate_clock_multiplier, UAC2_CLOCK_MULTIPLIER, UAC3_CLOCK_MULTIPLIER); static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id, int iface_no) { struct usb_host_interface *ctrl_intf; unsigned char buf; int ret; ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no); ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR, USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN, UAC2_CX_CLOCK_SELECTOR << 8, snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8), &buf, sizeof(buf)); if (ret < 0) return ret; return buf; } static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id, unsigned char pin, int iface_no) { struct usb_host_interface *ctrl_intf; int ret; ctrl_intf = snd_usb_find_ctrl_interface(chip, iface_no); ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR, USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT, UAC2_CX_CLOCK_SELECTOR << 8, snd_usb_ctrl_intf(ctrl_intf) | (selector_id << 8), &pin, sizeof(pin)); if (ret < 0) return ret; if (ret != sizeof(pin)) { usb_audio_err(chip, "setting selector (id %d) unexpected length %d\n", selector_id, ret); return -EINVAL; } ret = uac_clock_selector_get_val(chip, selector_id, iface_no); if (ret < 0) return ret; if (ret != pin) { usb_audio_err(chip, "setting selector (id %d) to %x failed (current: %d)\n", selector_id, pin, ret); return -EINVAL; } return ret; } static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, const struct audioformat *fmt, int source_id) { bool ret = false; int count; unsigned char data; struct usb_device *dev = chip->dev; union uac23_clock_source_desc *cs_desc; struct usb_host_interface *ctrl_intf; ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); if (!cs_desc) return false; if (fmt->protocol == UAC_VERSION_2) { /* * Assume the clock is valid if clock source supports only one * single sample rate, the terminal is connected directly to it * (there is no clock selector) and clock type is internal. * This is to deal with some Denon DJ controllers that always * reports that clock is invalid. */ if (fmt->nr_rates == 1 && (fmt->clock & 0xff) == cs_desc->v2.bClockID && (cs_desc->v2.bmAttributes & 0x3) != UAC_CLOCK_SOURCE_TYPE_EXT) return true; } /* * MOTU MicroBook IIc * Sample rate changes takes more than 2 seconds for this device. Clock * validity request returns false during that period. */ if (chip->usb_id == USB_ID(0x07fd, 0x0004)) { count = 0; while ((!ret) && (count < 50)) { int err; msleep(100); err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, UAC2_CS_CONTROL_CLOCK_VALID << 8, snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), &data, sizeof(data)); if (err < 0) { dev_warn(&dev->dev, "%s(): cannot get clock validity for id %d\n", __func__, source_id); return false; } ret = !!data; count++; } } return ret; } static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, const struct audioformat *fmt, int source_id) { int err; unsigned char data; struct usb_device *dev = chip->dev; u32 bmControls; union uac23_clock_source_desc *cs_desc; struct usb_host_interface *ctrl_intf; ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); cs_desc = snd_usb_find_clock_source(chip, source_id, fmt); if (!cs_desc) return false; if (fmt->protocol == UAC_VERSION_3) bmControls = le32_to_cpu(cs_desc->v3.bmControls); else bmControls = cs_desc->v2.bmControls; /* If a clock source can't tell us whether it's valid, we assume it is */ if (!uac_v2v3_control_is_readable(bmControls, UAC2_CS_CONTROL_CLOCK_VALID)) return true; err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, UAC2_CS_CONTROL_CLOCK_VALID << 8, snd_usb_ctrl_intf(ctrl_intf) | (source_id << 8), &data, sizeof(data)); if (err < 0) { dev_warn(&dev->dev, "%s(): cannot get clock validity for id %d\n", __func__, source_id); return false; } if (data) return true; else return uac_clock_source_is_valid_quirk(chip, fmt, source_id); } static int __uac_clock_find_source(struct snd_usb_audio *chip, const struct audioformat *fmt, int entity_id, unsigned long *visited, bool validate) { union uac23_clock_source_desc *source; union uac23_clock_selector_desc *selector; union uac23_clock_multiplier_desc *multiplier; int ret, i, cur, err, pins, clock_id; const u8 *sources; int proto = fmt->protocol; bool readable, writeable; u32 bmControls; entity_id &= 0xff; if (test_and_set_bit(entity_id, visited)) { usb_audio_warn(chip, "%s(): recursive clock topology detected, id %d.\n", __func__, entity_id); return -EINVAL; } /* first, see if the ID we're looking at is a clock source already */ source = snd_usb_find_clock_source(chip, entity_id, fmt); if (source) { entity_id = GET_VAL(source, proto, bClockID); if (validate && !uac_clock_source_is_valid(chip, fmt, entity_id)) { usb_audio_err(chip, "clock source %d is not valid, cannot use\n", entity_id); return -ENXIO; } return entity_id; } selector = snd_usb_find_clock_selector(chip, entity_id, fmt); if (selector) { pins = GET_VAL(selector, proto, bNrInPins); clock_id = GET_VAL(selector, proto, bClockID); sources = GET_VAL(selector, proto, baCSourceID); cur = 0; if (proto == UAC_VERSION_3) bmControls = le32_to_cpu(*(__le32 *)(&selector->v3.baCSourceID[0] + pins)); else bmControls = *(__u8 *)(&selector->v2.baCSourceID[0] + pins); readable = uac_v2v3_control_is_readable(bmControls, UAC2_CX_CLOCK_SELECTOR); writeable = uac_v2v3_control_is_writeable(bmControls, UAC2_CX_CLOCK_SELECTOR); if (pins == 1) { ret = 1; goto find_source; } /* for now just warn about buggy device */ if (!readable) usb_audio_warn(chip, "%s(): clock selector control is not readable, id %d\n", __func__, clock_id); /* the entity ID we are looking at is a selector. * find out what it currently selects */ ret = uac_clock_selector_get_val(chip, clock_id, fmt->iface); if (ret < 0) { if (!chip->autoclock) return ret; goto find_others; } /* Selector values are one-based */ if (ret > pins || ret < 1) { usb_audio_err(chip, "%s(): selector reported illegal value, id %d, ret %d\n", __func__, clock_id, ret); if (!chip->autoclock) return -EINVAL; goto find_others; } find_source: cur = ret; ret = __uac_clock_find_source(chip, fmt, sources[ret - 1], visited, validate); if (ret > 0) { /* Skip setting clock selector again for some devices */ if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR || !writeable) return ret; err = uac_clock_selector_set_val(chip, entity_id, cur, fmt->iface); if (err < 0) { if (pins == 1) { usb_audio_dbg(chip, "%s(): selector returned an error, " "assuming a firmware bug, id %d, ret %d\n", __func__, clock_id, err); return ret; } return err; } } if (!validate || ret > 0 || !chip->autoclock) return ret; find_others: if (!writeable) return -ENXIO; /* The current clock source is invalid, try others. */ for (i = 1; i <= pins; i++) { if (i == cur) continue; ret = __uac_clock_find_source(chip, fmt, sources[i - 1], visited, true); if (ret < 0) continue; err = uac_clock_selector_set_val(chip, entity_id, i, fmt->iface); if (err < 0) continue; usb_audio_info(chip, "found and selected valid clock source %d\n", ret); return ret; } return -ENXIO; } /* FIXME: multipliers only act as pass-thru element for now */ multiplier = snd_usb_find_clock_multiplier(chip, entity_id, fmt); if (multiplier) return __uac_clock_find_source(chip, fmt, GET_VAL(multiplier, proto, bCSourceID), visited, validate); return -EINVAL; } /* * For all kinds of sample rate settings and other device queries, * the clock source (end-leaf) must be used. However, clock selectors, * clock multipliers and sample rate converters may be specified as * clock source input to terminal. This functions walks the clock path * to its end and tries to find the source. * * The 'visited' bitfield is used internally to detect recursive loops. * * Returns the clock source UnitID (>=0) on success, or an error. */ int snd_usb_clock_find_source(struct snd_usb_audio *chip, const struct audioformat *fmt, bool validate) { DECLARE_BITMAP(visited, 256); memset(visited, 0, sizeof(visited)); switch (fmt->protocol) { case UAC_VERSION_2: case UAC_VERSION_3: return __uac_clock_find_source(chip, fmt, fmt->clock, visited, validate); default: return -EINVAL; } } static int set_sample_rate_v1(struct snd_usb_audio *chip, const struct audioformat *fmt, int rate) { struct usb_device *dev = chip->dev; unsigned char data[3]; int err, crate; /* if endpoint doesn't have sampling rate control, bail out */ if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) return 0; data[0] = rate; data[1] = rate >> 8; data[2] = rate >> 16; err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, UAC_EP_CS_ATTR_SAMPLE_RATE << 8, fmt->endpoint, data, sizeof(data)); if (err < 0) { dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n", fmt->iface, fmt->altsetting, rate, fmt->endpoint); return err; } /* Don't check the sample rate for devices which we know don't * support reading */ if (chip->quirk_flags & QUIRK_FLAG_GET_SAMPLE_RATE) return 0; /* the firmware is likely buggy, don't repeat to fail too many times */ if (chip->sample_rate_read_error > 2) return 0; err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR, USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN, UAC_EP_CS_ATTR_SAMPLE_RATE << 8, fmt->endpoint, data, sizeof(data)); if (err < 0) { dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n", fmt->iface, fmt->altsetting, fmt->endpoint); chip->sample_rate_read_error++; return 0; /* some devices don't support reading */ } crate = data[0] | (data[1] << 8) | (data[2] << 16); if (!crate) { dev_info(&dev->dev, "failed to read current rate; disabling the check\n"); chip->sample_rate_read_error = 3; /* three strikes, see above */ return 0; } if (crate != rate) { dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate); // runtime->rate = crate; } return 0; } static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface, int altsetting, int clock) { struct usb_device *dev = chip->dev; __le32 data; int err; struct usb_host_interface *ctrl_intf; ctrl_intf = snd_usb_find_ctrl_interface(chip, iface); err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, UAC2_CS_CONTROL_SAM_FREQ << 8, snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), &data, sizeof(data)); if (err < 0) { dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n", iface, altsetting, err); return 0; } return le32_to_cpu(data); } /* * Try to set the given sample rate: * * Return 0 if the clock source is read-only, the actual rate on success, * or a negative error code. * * This function gets called from format.c to validate each sample rate, too. * Hence no message is shown upon error */ int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip, const struct audioformat *fmt, int clock, int rate) { bool writeable; u32 bmControls; __le32 data; int err; union uac23_clock_source_desc *cs_desc; struct usb_host_interface *ctrl_intf; ctrl_intf = snd_usb_find_ctrl_interface(chip, fmt->iface); cs_desc = snd_usb_find_clock_source(chip, clock, fmt); if (!cs_desc) return 0; if (fmt->protocol == UAC_VERSION_3) bmControls = le32_to_cpu(cs_desc->v3.bmControls); else bmControls = cs_desc->v2.bmControls; writeable = uac_v2v3_control_is_writeable(bmControls, UAC2_CS_CONTROL_SAM_FREQ); if (!writeable) return 0; data = cpu_to_le32(rate); err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, UAC2_CS_CONTROL_SAM_FREQ << 8, snd_usb_ctrl_intf(ctrl_intf) | (clock << 8), &data, sizeof(data)); if (err < 0) return err; return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); } static int set_sample_rate_v2v3(struct snd_usb_audio *chip, const struct audioformat *fmt, int rate) { int cur_rate, prev_rate; int clock; /* First, try to find a valid clock. This may trigger * automatic clock selection if the current clock is not * valid. */ clock = snd_usb_clock_find_source(chip, fmt, true); if (clock < 0) { /* We did not find a valid clock, but that might be * because the current sample rate does not match an * external clock source. Try again without validation * and we will do another validation after setting the * rate. */ clock = snd_usb_clock_find_source(chip, fmt, false); /* Hardcoded sample rates */ if (chip->quirk_flags & QUIRK_FLAG_IGNORE_CLOCK_SOURCE) return 0; if (clock < 0) return clock; } prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); if (prev_rate == rate) goto validation; cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate); if (cur_rate < 0) { usb_audio_err(chip, "%d:%d: cannot set freq %d (v2/v3): err %d\n", fmt->iface, fmt->altsetting, rate, cur_rate); return cur_rate; } if (!cur_rate) cur_rate = prev_rate; if (cur_rate != rate) { usb_audio_dbg(chip, "%d:%d: freq mismatch: req %d, clock runs @%d\n", fmt->iface, fmt->altsetting, rate, cur_rate); /* continue processing */ } /* FIXME - TEAC devices require the immediate interface setup */ if (USB_ID_VENDOR(chip->usb_id) == 0x0644) { bool cur_base_48k = (rate % 48000 == 0); bool prev_base_48k = (prev_rate % 48000 == 0); if (cur_base_48k != prev_base_48k) { usb_set_interface(chip->dev, fmt->iface, fmt->altsetting); if (chip->quirk_flags & QUIRK_FLAG_IFACE_DELAY) msleep(50); } } validation: /* validate clock after rate change */ if (!uac_clock_source_is_valid(chip, fmt, clock)) return -ENXIO; return 0; } int snd_usb_init_sample_rate(struct snd_usb_audio *chip, const struct audioformat *fmt, int rate) { usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n", fmt->iface, fmt->altsetting, rate, fmt->clock); switch (fmt->protocol) { case UAC_VERSION_1: default: return set_sample_rate_v1(chip, fmt, rate); case UAC_VERSION_3: if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) { if (rate != UAC3_BADD_SAMPLING_RATE) return -ENXIO; else return 0; } fallthrough; case UAC_VERSION_2: return set_sample_rate_v2v3(chip, fmt, rate); } }