Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 700 insertions, 0 deletions

diff --git a/sound/pci/ac97/ac97_pcm.c b/sound/pci/ac97/ac97_pcm.c
new file mode 100644
index 00000000000..dd289b9512e
--- /dev/null
+++ b/sound/pci/ac97/ac97_pcm.c
@@ -0,0 +1,700 @@
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *  Universal interface for Audio Codec '97
+ *
+ *  For more details look to AC '97 component specification revision 2.2
+ *  by Intel Corporation (http://developer.intel.com) and to datasheets
+ *  for specific codecs.
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include <sound/driver.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/control.h>
+#include <sound/ac97_codec.h>
+#include <sound/asoundef.h>
+#include "ac97_patch.h"
+#include "ac97_id.h"
+#include "ac97_local.h"
+
+/*
+ *  PCM support
+ */
+
+static unsigned char rate_reg_tables[2][4][9] = {
+{
+  /* standard rates */
+  {
+  	/* 3&4 front, 7&8 rear, 6&9 center/lfe */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 3 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 4 */
+	0xff,				/* slot 5 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 6 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 7 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 8 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 9 */
+	0xff,				/* slot 10 */
+	0xff,				/* slot 11 */
+  },
+  {
+  	/* 7&8 front, 6&9 rear, 10&11 center/lfe */
+	0xff,				/* slot 3 */
+	0xff,				/* slot 4 */
+	0xff,				/* slot 5 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 6 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 7 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 8 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 9 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 10 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 11 */
+  },
+  {
+  	/* 6&9 front, 10&11 rear, 3&4 center/lfe */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 3 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 4 */
+	0xff,				/* slot 5 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 6 */
+	0xff,				/* slot 7 */
+	0xff,				/* slot 8 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 9 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 10 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 11 */
+  },
+  {
+  	/* 10&11 front, 3&4 rear, 7&8 center/lfe */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 3 */
+	AC97_PCM_SURR_DAC_RATE,		/* slot 4 */
+	0xff,				/* slot 5 */
+	0xff,				/* slot 6 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 7 */
+	AC97_PCM_LFE_DAC_RATE,		/* slot 8 */
+	0xff,				/* slot 9 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 10 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 11 */
+  },
+},
+{
+  /* double rates */
+  {
+  	/* 3&4 front, 7&8 front (t+1) */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 3 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 4 */
+	0xff,				/* slot 5 */
+	0xff,				/* slot 6 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 7 */
+	AC97_PCM_FRONT_DAC_RATE,	/* slot 8 */
+	0xff,				/* slot 9 */
+	0xff,				/* slot 10 */
+	0xff,				/* slot 11 */
+  },
+  {
+	/* not specified in the specification */
+	0xff,				/* slot 3 */
+	0xff,				/* slot 4 */
+	0xff,				/* slot 5 */
+	0xff,				/* slot 6 */
+	0xff,				/* slot 7 */
+	0xff,				/* slot 8 */
+	0xff,				/* slot 9 */
+	0xff,				/* slot 10 */
+	0xff,				/* slot 11 */
+  },
+  {
+	0xff,				/* slot 3 */
+	0xff,				/* slot 4 */
+	0xff,				/* slot 5 */
+	0xff,				/* slot 6 */
+	0xff,				/* slot 7 */
+	0xff,				/* slot 8 */
+	0xff,				/* slot 9 */
+	0xff,				/* slot 10 */
+	0xff,				/* slot 11 */
+  },
+  {
+	0xff,				/* slot 3 */
+	0xff,				/* slot 4 */
+	0xff,				/* slot 5 */
+	0xff,				/* slot 6 */
+	0xff,				/* slot 7 */
+	0xff,				/* slot 8 */
+	0xff,				/* slot 9 */
+	0xff,				/* slot 10 */
+	0xff,				/* slot 11 */
+  }
+}};
+
+/* FIXME: more various mappings for ADC? */
+static unsigned char rate_cregs[9] = {
+	AC97_PCM_LR_ADC_RATE,	/* 3 */
+	AC97_PCM_LR_ADC_RATE,	/* 4 */
+	0xff,			/* 5 */
+	AC97_PCM_MIC_ADC_RATE,	/* 6 */
+	0xff,			/* 7 */
+	0xff,			/* 8 */
+	0xff,			/* 9 */
+	0xff,			/* 10 */
+	0xff,			/* 11 */
+};
+
+static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx,
+				  unsigned short slot, int dbl)
+{
+	if (slot < 3)
+		return 0xff;
+	if (slot > 11)
+		return 0xff;
+	if (pcm->spdif)
+		return AC97_SPDIF; /* pseudo register */
+	if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		return rate_reg_tables[dbl][pcm->r[dbl].rate_table[cidx]][slot - 3];
+	else
+		return rate_cregs[slot - 3];
+}
+
+static int set_spdif_rate(ac97_t *ac97, unsigned short rate)
+{
+	unsigned short old, bits, reg, mask;
+	unsigned int sbits;
+
+	if (! (ac97->ext_id & AC97_EI_SPDIF))
+		return -ENODEV;
+
+	/* TODO: double rate support */
+	if (ac97->flags & AC97_CS_SPDIF) {
+		switch (rate) {
+		case 48000: bits = 0; break;
+		case 44100: bits = 1 << AC97_SC_SPSR_SHIFT; break;
+		default: /* invalid - disable output */
+			snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
+			return -EINVAL;
+		}
+		reg = AC97_CSR_SPDIF;
+		mask = 1 << AC97_SC_SPSR_SHIFT;
+	} else {
+		if (ac97->id == AC97_ID_CM9739 && rate != 48000) {
+			snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
+			return -EINVAL;
+		}
+		switch (rate) {
+		case 44100: bits = AC97_SC_SPSR_44K; break;
+		case 48000: bits = AC97_SC_SPSR_48K; break;
+		case 32000: bits = AC97_SC_SPSR_32K; break;
+		default: /* invalid - disable output */
+			snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
+			return -EINVAL;
+		}
+		reg = AC97_SPDIF;
+		mask = AC97_SC_SPSR_MASK;
+	}
+
+	down(&ac97->reg_mutex);
+	old = snd_ac97_read(ac97, reg) & mask;
+	if (old != bits) {
+		snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, 0);
+		snd_ac97_update_bits_nolock(ac97, reg, mask, bits);
+		/* update the internal spdif bits */
+		sbits = ac97->spdif_status;
+		if (sbits & IEC958_AES0_PROFESSIONAL) {
+			sbits &= ~IEC958_AES0_PRO_FS;
+			switch (rate) {
+			case 44100: sbits |= IEC958_AES0_PRO_FS_44100; break;
+			case 48000: sbits |= IEC958_AES0_PRO_FS_48000; break;
+			case 32000: sbits |= IEC958_AES0_PRO_FS_32000; break;
+			}
+		} else {
+			sbits &= ~(IEC958_AES3_CON_FS << 24);
+			switch (rate) {
+			case 44100: sbits |= IEC958_AES3_CON_FS_44100<<24; break;
+			case 48000: sbits |= IEC958_AES3_CON_FS_48000<<24; break;
+			case 32000: sbits |= IEC958_AES3_CON_FS_32000<<24; break;
+			}
+		}
+		ac97->spdif_status = sbits;
+	}
+	snd_ac97_update_bits_nolock(ac97, AC97_EXTENDED_STATUS, AC97_EA_SPDIF, AC97_EA_SPDIF);
+	up(&ac97->reg_mutex);
+	return 0;
+}
+
+/**
+ * snd_ac97_set_rate - change the rate of the given input/output.
+ * @ac97: the ac97 instance
+ * @reg: the register to change
+ * @rate: the sample rate to set
+ *
+ * Changes the rate of the given input/output on the codec.
+ * If the codec doesn't support VAR, the rate must be 48000 (except
+ * for SPDIF).
+ *
+ * The valid registers are AC97_PMC_MIC_ADC_RATE,
+ * AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE.
+ * AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted
+ * if the codec supports them.
+ * AC97_SPDIF is accepted as a pseudo register to modify the SPDIF
+ * status bits.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_ac97_set_rate(ac97_t *ac97, int reg, unsigned int rate)
+{
+	int dbl;
+	unsigned int tmp;
+	
+	dbl = rate > 48000;
+	if (dbl) {
+		if (!(ac97->flags & AC97_DOUBLE_RATE))
+			return -EINVAL;
+		if (reg != AC97_PCM_FRONT_DAC_RATE)
+			return -EINVAL;
+	}
+
+	switch (reg) {
+	case AC97_PCM_MIC_ADC_RATE:
+		if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRM) == 0)	/* MIC VRA */
+			if (rate != 48000)
+				return -EINVAL;
+		break;
+	case AC97_PCM_FRONT_DAC_RATE:
+	case AC97_PCM_LR_ADC_RATE:
+		if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0)	/* VRA */
+			if (rate != 48000 && rate != 96000)
+				return -EINVAL;
+		break;
+	case AC97_PCM_SURR_DAC_RATE:
+		if (! (ac97->scaps & AC97_SCAP_SURROUND_DAC))
+			return -EINVAL;
+		break;
+	case AC97_PCM_LFE_DAC_RATE:
+		if (! (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
+			return -EINVAL;
+		break;
+	case AC97_SPDIF:
+		/* special case */
+		return set_spdif_rate(ac97, rate);
+	default:
+		return -EINVAL;
+	}
+	if (dbl)
+		rate /= 2;
+	tmp = (rate * ac97->bus->clock) / 48000;
+	if (tmp > 65535)
+		return -EINVAL;
+	if ((ac97->ext_id & AC97_EI_DRA) && reg == AC97_PCM_FRONT_DAC_RATE)
+		snd_ac97_update_bits(ac97, AC97_EXTENDED_STATUS,
+				     AC97_EA_DRA, dbl ? AC97_EA_DRA : 0);
+	snd_ac97_update(ac97, reg, tmp & 0xffff);
+	snd_ac97_read(ac97, reg);
+	return 0;
+}
+
+static unsigned short get_pslots(ac97_t *ac97, unsigned char *rate_table, unsigned short *spdif_slots)
+{
+	if (!ac97_is_audio(ac97))
+		return 0;
+	if (ac97_is_rev22(ac97) || ac97_can_amap(ac97)) {
+		unsigned short slots = 0;
+		if (ac97_is_rev22(ac97)) {
+			/* Note: it's simply emulation of AMAP behaviour */
+			u16 es;
+			es = ac97->regs[AC97_EXTENDED_ID] &= ~AC97_EI_DACS_SLOT_MASK;
+			switch (ac97->addr) {
+			case 1:
+			case 2: es |= (1<<AC97_EI_DACS_SLOT_SHIFT); break;
+			case 3: es |= (2<<AC97_EI_DACS_SLOT_SHIFT); break;
+			}
+			snd_ac97_write_cache(ac97, AC97_EXTENDED_ID, es);
+		}
+		switch (ac97->addr) {
+		case 0:
+			slots |= (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
+			if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
+				slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
+			if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
+				slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
+			if (ac97->ext_id & AC97_EI_SPDIF) {
+				if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
+					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
+				else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
+					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
+				else
+					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
+			}
+			*rate_table = 0;
+			break;
+		case 1:
+		case 2:
+			slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
+			if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
+				slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
+			if (ac97->ext_id & AC97_EI_SPDIF) {
+				if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
+					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
+				else
+					*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
+			}
+			*rate_table = 1;
+			break;
+		case 3:
+			slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
+			if (ac97->ext_id & AC97_EI_SPDIF)
+				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
+			*rate_table = 2;
+			break;
+		}
+		return slots;
+	} else {
+		unsigned short slots;
+		slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
+		if (ac97->scaps & AC97_SCAP_SURROUND_DAC)
+			slots |= (1<<AC97_SLOT_PCM_SLEFT)|(1<<AC97_SLOT_PCM_SRIGHT);
+		if (ac97->scaps & AC97_SCAP_CENTER_LFE_DAC)
+			slots |= (1<<AC97_SLOT_PCM_CENTER)|(1<<AC97_SLOT_LFE);
+		if (ac97->ext_id & AC97_EI_SPDIF) {
+			if (!(ac97->scaps & AC97_SCAP_SURROUND_DAC))
+				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT)|(1<<AC97_SLOT_SPDIF_RIGHT);
+			else if (!(ac97->scaps & AC97_SCAP_CENTER_LFE_DAC))
+				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT1)|(1<<AC97_SLOT_SPDIF_RIGHT1);
+			else
+				*spdif_slots = (1<<AC97_SLOT_SPDIF_LEFT2)|(1<<AC97_SLOT_SPDIF_RIGHT2);
+		}
+		*rate_table = 0;
+		return slots;
+	}
+}
+
+static unsigned short get_cslots(ac97_t *ac97)
+{
+	unsigned short slots;
+
+	if (!ac97_is_audio(ac97))
+		return 0;
+	slots = (1<<AC97_SLOT_PCM_LEFT)|(1<<AC97_SLOT_PCM_RIGHT);
+	slots |= (1<<AC97_SLOT_MIC);
+	return slots;
+}
+
+static unsigned int get_rates(struct ac97_pcm *pcm, unsigned int cidx, unsigned short slots, int dbl)
+{
+	int i, idx;
+	unsigned int rates = ~0;
+	unsigned char reg;
+
+	for (i = 3; i < 12; i++) {
+		if (!(slots & (1 << i)))
+			continue;
+		reg = get_slot_reg(pcm, cidx, i, dbl);
+		switch (reg) {
+		case AC97_PCM_FRONT_DAC_RATE:	idx = AC97_RATES_FRONT_DAC; break;
+		case AC97_PCM_SURR_DAC_RATE:	idx = AC97_RATES_SURR_DAC; break;
+		case AC97_PCM_LFE_DAC_RATE:	idx = AC97_RATES_LFE_DAC; break;
+		case AC97_PCM_LR_ADC_RATE:	idx = AC97_RATES_ADC; break;
+		case AC97_PCM_MIC_ADC_RATE:	idx = AC97_RATES_MIC_ADC; break;
+		default:			idx = AC97_RATES_SPDIF; break;
+		}
+		rates &= pcm->r[dbl].codec[cidx]->rates[idx];
+	}
+	if (!dbl)
+		rates &= ~(SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_88200 |
+			   SNDRV_PCM_RATE_96000);
+	return rates;
+}
+
+/**
+ * snd_ac97_pcm_assign - assign AC97 slots to given PCM streams
+ * @bus: the ac97 bus instance
+ * @pcms_count: count of PCMs to be assigned
+ * @pcms: PCMs to be assigned
+ *
+ * It assigns available AC97 slots for given PCMs. If none or only
+ * some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members
+ * are reduced and might be zero.
+ */
+int snd_ac97_pcm_assign(ac97_bus_t *bus,
+			unsigned short pcms_count,
+			const struct ac97_pcm *pcms)
+{
+	int i, j, k;
+	const struct ac97_pcm *pcm;
+	struct ac97_pcm *rpcms, *rpcm;
+	unsigned short avail_slots[2][4];
+	unsigned char rate_table[2][4];
+	unsigned short tmp, slots;
+	unsigned short spdif_slots[4];
+	unsigned int rates;
+	ac97_t *codec;
+
+	rpcms = kcalloc(pcms_count, sizeof(struct ac97_pcm), GFP_KERNEL);
+	if (rpcms == NULL)
+		return -ENOMEM;
+	memset(avail_slots, 0, sizeof(avail_slots));
+	memset(rate_table, 0, sizeof(rate_table));
+	memset(spdif_slots, 0, sizeof(spdif_slots));
+	for (i = 0; i < 4; i++) {
+		codec = bus->codec[i];
+		if (!codec)
+			continue;
+		avail_slots[0][i] = get_pslots(codec, &rate_table[0][i], &spdif_slots[i]);
+		avail_slots[1][i] = get_cslots(codec);
+		if (!(codec->scaps & AC97_SCAP_INDEP_SDIN)) {
+			for (j = 0; j < i; j++) {
+				if (bus->codec[j])
+					avail_slots[1][i] &= ~avail_slots[1][j];
+			}
+		}
+	}
+	/* first step - exclusive devices */
+	for (i = 0; i < pcms_count; i++) {
+		pcm = &pcms[i];
+		rpcm = &rpcms[i];
+		/* low-level driver thinks that it's more clever */
+		if (pcm->copy_flag) {
+			*rpcm = *pcm;
+			continue;
+		}
+		rpcm->stream = pcm->stream;
+		rpcm->exclusive = pcm->exclusive;
+		rpcm->spdif = pcm->spdif;
+		rpcm->private_value = pcm->private_value;
+		rpcm->bus = bus;
+		rpcm->rates = ~0;
+		slots = pcm->r[0].slots;
+		for (j = 0; j < 4 && slots; j++) {
+			if (!bus->codec[j])
+				continue;
+			rates = ~0;
+			if (pcm->spdif && pcm->stream == 0)
+				tmp = spdif_slots[j];
+			else
+				tmp = avail_slots[pcm->stream][j];
+			if (pcm->exclusive) {
+				/* exclusive access */
+				tmp &= slots;
+				for (k = 0; k < i; k++) {
+					if (rpcm->stream == rpcms[k].stream)
+						tmp &= ~rpcms[k].r[0].rslots[j];
+				}
+			} else {
+				/* non-exclusive access */
+				tmp &= pcm->r[0].slots;
+			}
+			if (tmp) {
+				rpcm->r[0].rslots[j] = tmp;
+				rpcm->r[0].codec[j] = bus->codec[j];
+				rpcm->r[0].rate_table[j] = rate_table[pcm->stream][j];
+				if (bus->no_vra)
+					rates = SNDRV_PCM_RATE_48000;
+				else
+					rates = get_rates(rpcm, j, tmp, 0);
+				if (pcm->exclusive)
+					avail_slots[pcm->stream][j] &= ~tmp;
+			}
+			slots &= ~tmp;
+			rpcm->r[0].slots |= tmp;
+			rpcm->rates &= rates;
+		}
+		/* for double rate, we check the first codec only */
+		if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+		    bus->codec[0] && (bus->codec[0]->flags & AC97_DOUBLE_RATE) &&
+		    rate_table[pcm->stream][0] == 0) {
+			tmp = (1<<AC97_SLOT_PCM_LEFT) | (1<<AC97_SLOT_PCM_RIGHT) |
+			      (1<<AC97_SLOT_PCM_LEFT_0) | (1<<AC97_SLOT_PCM_RIGHT_0);
+			if ((tmp & pcm->r[1].slots) == tmp) {
+				rpcm->r[1].slots = tmp;
+				rpcm->r[1].rslots[0] = tmp;
+				rpcm->r[1].rate_table[0] = 0;
+				rpcm->r[1].codec[0] = bus->codec[0];
+				if (pcm->exclusive)
+					avail_slots[pcm->stream][0] &= ~tmp;
+				if (bus->no_vra)
+					rates = SNDRV_PCM_RATE_96000;
+				else
+					rates = get_rates(rpcm, 0, tmp, 1);
+				rpcm->rates |= rates;
+			}
+		}
+		if (rpcm->rates == ~0)
+			rpcm->rates = 0; /* not used */
+	}
+	bus->pcms_count = pcms_count;
+	bus->pcms = rpcms;
+	return 0;
+}
+
+/**
+ * snd_ac97_pcm_open - opens the given AC97 pcm
+ * @pcm: the ac97 pcm instance
+ * @rate: rate in Hz, if codec does not support VRA, this value must be 48000Hz
+ * @cfg: output stream characteristics
+ * @slots: a subset of allocated slots (snd_ac97_pcm_assign) for this pcm
+ *
+ * It locks the specified slots and sets the given rate to AC97 registers.
+ */
+int snd_ac97_pcm_open(struct ac97_pcm *pcm, unsigned int rate,
+		      enum ac97_pcm_cfg cfg, unsigned short slots)
+{
+	ac97_bus_t *bus;
+	int i, cidx, r, ok_flag;
+	unsigned int reg_ok[4] = {0,0,0,0};
+	unsigned char reg;
+	int err = 0;
+
+	r = rate > 48000;
+	bus = pcm->bus;
+	if (cfg == AC97_PCM_CFG_SPDIF) {
+		int err;
+		for (cidx = 0; cidx < 4; cidx++)
+			if (bus->codec[cidx] && (bus->codec[cidx]->ext_id & AC97_EI_SPDIF)) {
+				err = set_spdif_rate(bus->codec[cidx], rate);
+				if (err < 0)
+					return err;
+			}
+	}
+	spin_lock_irq(&pcm->bus->bus_lock);
+	for (i = 3; i < 12; i++) {
+		if (!(slots & (1 << i)))
+			continue;
+		ok_flag = 0;
+		for (cidx = 0; cidx < 4; cidx++) {
+			if (bus->used_slots[pcm->stream][cidx] & (1 << i)) {
+				spin_unlock_irq(&pcm->bus->bus_lock);
+				err = -EBUSY;
+				goto error;
+			}
+			if (pcm->r[r].rslots[cidx] & (1 << i)) {
+				bus->used_slots[pcm->stream][cidx] |= (1 << i);
+				ok_flag++;
+			}
+		}
+		if (!ok_flag) {
+			spin_unlock_irq(&pcm->bus->bus_lock);
+			snd_printk(KERN_ERR "cannot find configuration for AC97 slot %i\n", i);
+			err = -EAGAIN;
+			goto error;
+		}
+	}
+	spin_unlock_irq(&pcm->bus->bus_lock);
+	for (i = 3; i < 12; i++) {
+		if (!(slots & (1 << i)))
+			continue;
+		for (cidx = 0; cidx < 4; cidx++) {
+			if (pcm->r[r].rslots[cidx] & (1 << i)) {
+				reg = get_slot_reg(pcm, cidx, i, r);
+				if (reg == 0xff) {
+					snd_printk(KERN_ERR "invalid AC97 slot %i?\n", i);
+					continue;
+				}
+				if (reg_ok[cidx] & (1 << (reg - AC97_PCM_FRONT_DAC_RATE)))
+					continue;
+				//printk(KERN_DEBUG "setting ac97 reg 0x%x to rate %d\n", reg, rate);
+				err = snd_ac97_set_rate(pcm->r[r].codec[cidx], reg, rate);
+				if (err < 0)
+					snd_printk(KERN_ERR "error in snd_ac97_set_rate: cidx=%d, reg=0x%x, rate=%d, err=%d\n", cidx, reg, rate, err);
+				else
+					reg_ok[cidx] |= (1 << (reg - AC97_PCM_FRONT_DAC_RATE));
+			}
+		}
+	}
+	pcm->aslots = slots;
+	return 0;
+
+ error:
+	pcm->aslots = slots;
+	snd_ac97_pcm_close(pcm);
+	return err;
+}
+
+/**
+ * snd_ac97_pcm_close - closes the given AC97 pcm
+ * @pcm: the ac97 pcm instance
+ *
+ * It frees the locked AC97 slots.
+ */
+int snd_ac97_pcm_close(struct ac97_pcm *pcm)
+{
+	ac97_bus_t *bus;
+	unsigned short slots = pcm->aslots;
+	int i, cidx;
+
+	bus = pcm->bus;
+	spin_lock_irq(&pcm->bus->bus_lock);
+	for (i = 3; i < 12; i++) {
+		if (!(slots & (1 << i)))
+			continue;
+		for (cidx = 0; cidx < 4; cidx++)
+			bus->used_slots[pcm->stream][cidx] &= ~(1 << i);
+	}
+	pcm->aslots = 0;
+	spin_unlock_irq(&pcm->bus->bus_lock);
+	return 0;
+}
+
+static int double_rate_hw_constraint_rate(snd_pcm_hw_params_t *params,
+					  snd_pcm_hw_rule_t *rule)
+{
+	snd_interval_t *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+	if (channels->min > 2) {
+		static const snd_interval_t single_rates = {
+			.min = 1,
+			.max = 48000,
+		};
+		snd_interval_t *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+		return snd_interval_refine(rate, &single_rates);
+	}
+	return 0;
+}
+
+static int double_rate_hw_constraint_channels(snd_pcm_hw_params_t *params,
+					      snd_pcm_hw_rule_t *rule)
+{
+	snd_interval_t *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+	if (rate->min > 48000) {
+		static const snd_interval_t double_rate_channels = {
+			.min = 2,
+			.max = 2,
+		};
+		snd_interval_t *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+		return snd_interval_refine(channels, &double_rate_channels);
+	}
+	return 0;
+}
+
+/**
+ * snd_ac97_pcm_double_rate_rules - set double rate constraints
+ * @runtime: the runtime of the ac97 front playback pcm
+ *
+ * Installs the hardware constraint rules to prevent using double rates and
+ * more than two channels at the same time.
+ */
+int snd_ac97_pcm_double_rate_rules(snd_pcm_runtime_t *runtime)
+{
+	int err;
+
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				  double_rate_hw_constraint_rate, NULL,
+				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+	if (err < 0)
+		return err;
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+				  double_rate_hw_constraint_channels, NULL,
+				  SNDRV_PCM_HW_PARAM_RATE, -1);
+	return err;
+}