patch-2.2.18 linux/drivers/sound/emu10k1/ecard.c

• Lines: 156
• Date: Tue Sep 5 21:50:50 2000
• Orig file: v2.2.17/drivers/sound/emu10k1/ecard.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/sound/emu10k1/ecard.c linux/drivers/sound/emu10k1/ecard.c
@@ -0,0 +1,155 @@
+/*     
+ **********************************************************************
+ *     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;
+
+	hcvalue = emu10k1_readfn0(card, HCFG) & ~(HOOKN_BIT|HANDN_BIT|PULSEN_BIT);
+
+	emu10k1_writefn0(card, HCFG, hcvalue);
+
+	for (count = 0 ; count < EC_NUM_CONTROL_BITS; count++) {
+	
+		/* Set up the value */
+		data = ((value & 0x1) ? PULSEN_BIT : 0);
+		value >>= 1;
+
+		emu10k1_writefn0(card, HCFG, hcvalue | data);
+
+		/* Clock the shift register */
+		emu10k1_writefn0(card, HCFG, hcvalue | data | HANDN_BIT);
+		emu10k1_writefn0(card, HCFG, hcvalue | data);
+	}
+
+	/* Latch the bits */
+	emu10k1_writefn0(card, HCFG, hcvalue | HOOKN_BIT);
+	emu10k1_writefn0(card, HCFG, hcvalue);
+}
+
+int __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);
+	emu10k1_readfn0(card, HCFG);
+
+	/* 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);
+	
+	return 0;
+}
+
+