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-rw-r--r--sound/oss/emu10k1/ecard.c157
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diff --git a/sound/oss/emu10k1/ecard.c b/sound/oss/emu10k1/ecard.c
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+/*
+ **********************************************************************
+ * ecard.c - E-card initialization code
+ * Copyright 1999, 2000 Creative Labs, Inc.
+ *
+ **********************************************************************
+ *
+ * Date Author Summary of changes
+ * ---- ------ ------------------
+ * October 20, 1999 Bertrand Lee base code release
+ *
+ **********************************************************************
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ **********************************************************************
+ */
+
+#include "ecard.h"
+#include "hwaccess.h"
+
+/* Private routines */
+static void ecard_setadcgain(struct emu10k1_card *, struct ecard_state *, u16);
+static void ecard_write(struct emu10k1_card *, u32);
+
+/**************************************************************************
+ * @func Set the gain of the ECARD's CS3310 Trim/gain controller. The
+ * trim value consists of a 16bit value which is composed of two
+ * 8 bit gain/trim values, one for the left channel and one for the
+ * right channel. The following table maps from the Gain/Attenuation
+ * value in decibels into the corresponding bit pattern for a single
+ * channel.
+ */
+
+static void ecard_setadcgain(struct emu10k1_card *card, struct ecard_state *ecard, u16 gain)
+{
+ u32 currbit;
+ ecard->adc_gain = gain;
+
+ /* Enable writing to the TRIM registers */
+ ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN);
+
+ /* Do it again to insure that we meet hold time requirements */
+ ecard_write(card, ecard->control_bits & ~EC_TRIM_CSN);
+
+ for (currbit = (1L << 15); currbit; currbit >>= 1) {
+
+ u32 value = ecard->control_bits & ~(EC_TRIM_CSN|EC_TRIM_SDATA);
+
+ if (gain & currbit)
+ value |= EC_TRIM_SDATA;
+
+ /* Clock the bit */
+ ecard_write(card, value);
+ ecard_write(card, value | EC_TRIM_SCLK);
+ ecard_write(card, value);
+ }
+
+ ecard_write(card, ecard->control_bits);
+}
+
+/**************************************************************************
+ * @func Clock bits into the Ecard's control latch. The Ecard uses a
+ * control latch will is loaded bit-serially by toggling the Modem control
+ * lines from function 2 on the E8010. This function hides these details
+ * and presents the illusion that we are actually writing to a distinct
+ * register.
+ */
+static void ecard_write(struct emu10k1_card *card, u32 value)
+{
+ u16 count;
+ u32 data, hcvalue;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+
+ hcvalue = inl(card->iobase + HCFG) & ~(HOOKN_BIT|HANDN_BIT|PULSEN_BIT);
+
+ outl(card->iobase + HCFG, hcvalue);
+
+ for (count = 0 ; count < EC_NUM_CONTROL_BITS; count++) {
+
+ /* Set up the value */
+ data = ((value & 0x1) ? PULSEN_BIT : 0);
+ value >>= 1;
+
+ outl(card->iobase + HCFG, hcvalue | data);
+
+ /* Clock the shift register */
+ outl(card->iobase + HCFG, hcvalue | data | HANDN_BIT);
+ outl(card->iobase + HCFG, hcvalue | data);
+ }
+
+ /* Latch the bits */
+ outl(card->iobase + HCFG, hcvalue | HOOKN_BIT);
+ outl(card->iobase + HCFG, hcvalue);
+
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+void __devinit emu10k1_ecard_init(struct emu10k1_card *card)
+{
+ u32 hcvalue;
+ struct ecard_state ecard;
+
+ /* Set up the initial settings */
+ ecard.mux0_setting = EC_DEFAULT_SPDIF0_SEL;
+ ecard.mux1_setting = EC_DEFAULT_SPDIF1_SEL;
+ ecard.mux2_setting = 0;
+ ecard.adc_gain = EC_DEFAULT_ADC_GAIN;
+ ecard.control_bits = EC_RAW_RUN_MODE |
+ EC_SPDIF0_SELECT(ecard.mux0_setting) |
+ EC_SPDIF1_SELECT(ecard.mux1_setting);
+
+
+ /* Step 0: Set the codec type in the hardware control register
+ * and enable audio output */
+ hcvalue = emu10k1_readfn0(card, HCFG);
+ emu10k1_writefn0(card, HCFG, hcvalue | HCFG_AUDIOENABLE | HCFG_CODECFORMAT_I2S);
+
+ /* Step 1: Turn off the led and deassert TRIM_CS */
+ ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN);
+
+ /* Step 2: Calibrate the ADC and DAC */
+ ecard_write(card, EC_DACCAL | EC_LEDN | EC_TRIM_CSN);
+
+ /* Step 3: Wait for awhile; FIXME: Is this correct? */
+
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(HZ);
+
+ /* Step 4: Switch off the DAC and ADC calibration. Note
+ * That ADC_CAL is actually an inverted signal, so we assert
+ * it here to stop calibration. */
+ ecard_write(card, EC_ADCCAL | EC_LEDN | EC_TRIM_CSN);
+
+ /* Step 4: Switch into run mode */
+ ecard_write(card, ecard.control_bits);
+
+ /* Step 5: Set the analog input gain */
+ ecard_setadcgain(card, &ecard, ecard.adc_gain);
+}
+
+
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