166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/*
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* STK1160 driver
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*
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* Copyright (C) 2012 Ezequiel Garcia
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* <elezegarcia--a.t--gmail.com>
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*
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* Copyright (C) 2016 Marcel Hasler
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* <mahasler--a.t--gmail.com>
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*
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* Based on Easycap driver by R.M. Thomas
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* Copyright (C) 2010 R.M. Thomas
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* <rmthomas--a.t--sciolus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/delay.h>
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#include "stk1160.h"
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#include "stk1160-reg.h"
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static int stk1160_ac97_wait_transfer_complete(struct stk1160 *dev)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(STK1160_AC97_TIMEOUT);
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u8 value;
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/* Wait for AC97 transfer to complete */
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while (time_is_after_jiffies(timeout)) {
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stk1160_read_reg(dev, STK1160_AC97CTL_0, &value);
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if (!(value & (STK1160_AC97CTL_0_CR | STK1160_AC97CTL_0_CW)))
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return 0;
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usleep_range(50, 100);
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}
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stk1160_err("AC97 transfer took too long, this should never happen!");
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return -EBUSY;
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}
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static void stk1160_write_ac97(struct stk1160 *dev, u16 reg, u16 value)
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{
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/* Set codec register address */
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stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
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/* Set codec command */
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stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff);
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stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8);
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/* Set command write bit to initiate write operation */
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stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
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/* Wait for command write bit to be cleared */
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stk1160_ac97_wait_transfer_complete(dev);
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}
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#ifdef DEBUG
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static u16 stk1160_read_ac97(struct stk1160 *dev, u16 reg)
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{
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u8 vall = 0;
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u8 valh = 0;
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/* Set codec register address */
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stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
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/* Set command read bit to initiate read operation */
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stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b);
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/* Wait for command read bit to be cleared */
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if (stk1160_ac97_wait_transfer_complete(dev) < 0)
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return 0;
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/* Retrieve register value */
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stk1160_read_reg(dev, STK1160_AC97_CMD, &vall);
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stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh);
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return (valh << 8) | vall;
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}
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void stk1160_ac97_dump_regs(struct stk1160 *dev)
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{
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u16 value;
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value = stk1160_read_ac97(dev, 0x12); /* CD volume */
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stk1160_dbg("0x12 == 0x%04x", value);
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value = stk1160_read_ac97(dev, 0x10); /* Line-in volume */
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stk1160_dbg("0x10 == 0x%04x", value);
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value = stk1160_read_ac97(dev, 0x0e); /* MIC volume (mono) */
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stk1160_dbg("0x0e == 0x%04x", value);
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value = stk1160_read_ac97(dev, 0x16); /* Aux volume */
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stk1160_dbg("0x16 == 0x%04x", value);
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value = stk1160_read_ac97(dev, 0x1a); /* Record select */
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stk1160_dbg("0x1a == 0x%04x", value);
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value = stk1160_read_ac97(dev, 0x02); /* Master volume */
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stk1160_dbg("0x02 == 0x%04x", value);
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value = stk1160_read_ac97(dev, 0x1c); /* Record gain */
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stk1160_dbg("0x1c == 0x%04x", value);
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}
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#endif
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static int stk1160_has_audio(struct stk1160 *dev)
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{
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u8 value;
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stk1160_read_reg(dev, STK1160_POSV_L, &value);
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return !(value & STK1160_POSV_L_ACDOUT);
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}
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static int stk1160_has_ac97(struct stk1160 *dev)
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{
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u8 value;
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stk1160_read_reg(dev, STK1160_POSV_L, &value);
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return !(value & STK1160_POSV_L_ACSYNC);
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}
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void stk1160_ac97_setup(struct stk1160 *dev)
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{
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if (!stk1160_has_audio(dev)) {
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stk1160_info("Device doesn't support audio, skipping AC97 setup.");
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return;
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}
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if (!stk1160_has_ac97(dev)) {
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stk1160_info("Device uses internal 8-bit ADC, skipping AC97 setup.");
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return;
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}
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/* Two-step reset AC97 interface and hardware codec */
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stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94);
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stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
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/* Set 16-bit audio data and choose L&R channel*/
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stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01);
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stk1160_write_reg(dev, STK1160_AC97CTL_1 + 3, 0x00);
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/* Setup channels */
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stk1160_write_ac97(dev, 0x12, 0x8808); /* CD volume */
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stk1160_write_ac97(dev, 0x10, 0x0808); /* Line-in volume */
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stk1160_write_ac97(dev, 0x0e, 0x0008); /* MIC volume (mono) */
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stk1160_write_ac97(dev, 0x16, 0x0808); /* Aux volume */
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stk1160_write_ac97(dev, 0x1a, 0x0404); /* Record select */
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stk1160_write_ac97(dev, 0x02, 0x0000); /* Master volume */
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stk1160_write_ac97(dev, 0x1c, 0x0808); /* Record gain */
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#ifdef DEBUG
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stk1160_ac97_dump_regs(dev);
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#endif
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}
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