LXR linux/drivers/media/usb/stk1160/stk1160-ac97.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * STK1160 driver
   4 *
   5 * Copyright (C) 2012 Ezequiel Garcia
   6 * <elezegarcia--a.t--gmail.com>
   7 *
   8 * Copyright (C) 2016 Marcel Hasler
   9 * <mahasler--a.t--gmail.com>
  10 *
  11 * Based on Easycap driver by R.M. Thomas
  12 *      Copyright (C) 2010 R.M. Thomas
  13 *      <rmthomas--a.t--sciolus.org>
  14 */
  15
  16#include <linux/delay.h>
  17
  18#include "stk1160.h"
  19#include "stk1160-reg.h"
  20
  21static int stk1160_ac97_wait_transfer_complete(struct stk1160 *dev)
  22{
  23        unsigned long timeout = jiffies + msecs_to_jiffies(STK1160_AC97_TIMEOUT);
  24        u8 value;
  25
  26        /* Wait for AC97 transfer to complete */
  27        while (time_is_after_jiffies(timeout)) {
  28                stk1160_read_reg(dev, STK1160_AC97CTL_0, &value);
  29
  30                if (!(value & (STK1160_AC97CTL_0_CR | STK1160_AC97CTL_0_CW)))
  31                        return 0;
  32
  33                usleep_range(50, 100);
  34        }
  35
  36        stk1160_err("AC97 transfer took too long, this should never happen!");
  37        return -EBUSY;
  38}
  39
  40static void stk1160_write_ac97(struct stk1160 *dev, u16 reg, u16 value)
  41{
  42        /* Set codec register address */
  43        stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
  44
  45        /* Set codec command */
  46        stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff);
  47        stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8);
  48
  49        /* Set command write bit to initiate write operation */
  50        stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
  51
  52        /* Wait for command write bit to be cleared */
  53        stk1160_ac97_wait_transfer_complete(dev);
  54}
  55
  56#ifdef DEBUG
  57static u16 stk1160_read_ac97(struct stk1160 *dev, u16 reg)
  58{
  59        u8 vall = 0;
  60        u8 valh = 0;
  61
  62        /* Set codec register address */
  63        stk1160_write_reg(dev, STK1160_AC97_ADDR, reg);
  64
  65        /* Set command read bit to initiate read operation */
  66        stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b);
  67
  68        /* Wait for command read bit to be cleared */
  69        if (stk1160_ac97_wait_transfer_complete(dev) < 0)
  70                return 0;
  71
  72
  73        /* Retrieve register value */
  74        stk1160_read_reg(dev, STK1160_AC97_CMD, &vall);
  75        stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh);
  76
  77        return (valh << 8) | vall;
  78}
  79
  80void stk1160_ac97_dump_regs(struct stk1160 *dev)
  81{
  82        u16 value;
  83
  84        value = stk1160_read_ac97(dev, 0x12); /* CD volume */
  85        stk1160_dbg("0x12 == 0x%04x", value);
  86
  87        value = stk1160_read_ac97(dev, 0x10); /* Line-in volume */
  88        stk1160_dbg("0x10 == 0x%04x", value);
  89
  90        value = stk1160_read_ac97(dev, 0x0e); /* MIC volume (mono) */
  91        stk1160_dbg("0x0e == 0x%04x", value);
  92
  93        value = stk1160_read_ac97(dev, 0x16); /* Aux volume */
  94        stk1160_dbg("0x16 == 0x%04x", value);
  95
  96        value = stk1160_read_ac97(dev, 0x1a); /* Record select */
  97        stk1160_dbg("0x1a == 0x%04x", value);
  98
  99        value = stk1160_read_ac97(dev, 0x02); /* Master volume */
 100        stk1160_dbg("0x02 == 0x%04x", value);
 101
 102        value = stk1160_read_ac97(dev, 0x1c); /* Record gain */
 103        stk1160_dbg("0x1c == 0x%04x", value);
 104}
 105#endif
 106
 107static int stk1160_has_audio(struct stk1160 *dev)
 108{
 109        u8 value;
 110
 111        stk1160_read_reg(dev, STK1160_POSV_L, &value);
 112        return !(value & STK1160_POSV_L_ACDOUT);
 113}
 114
 115static int stk1160_has_ac97(struct stk1160 *dev)
 116{
 117        u8 value;
 118
 119        stk1160_read_reg(dev, STK1160_POSV_L, &value);
 120        return !(value & STK1160_POSV_L_ACSYNC);
 121}
 122
 123void stk1160_ac97_setup(struct stk1160 *dev)
 124{
 125        if (!stk1160_has_audio(dev)) {
 126                stk1160_info("Device doesn't support audio, skipping AC97 setup.");
 127                return;
 128        }
 129
 130        if (!stk1160_has_ac97(dev)) {
 131                stk1160_info("Device uses internal 8-bit ADC, skipping AC97 setup.");
 132                return;
 133        }
 134
 135        /* Two-step reset AC97 interface and hardware codec */
 136        stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94);
 137        stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c);
 138
 139        /* Set 16-bit audio data and choose L&R channel*/
 140        stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01);
 141        stk1160_write_reg(dev, STK1160_AC97CTL_1 + 3, 0x00);
 142
 143        /* Setup channels */
 144        stk1160_write_ac97(dev, 0x12, 0x8808); /* CD volume */
 145        stk1160_write_ac97(dev, 0x10, 0x0808); /* Line-in volume */
 146        stk1160_write_ac97(dev, 0x0e, 0x0008); /* MIC volume (mono) */
 147        stk1160_write_ac97(dev, 0x16, 0x0808); /* Aux volume */
 148        stk1160_write_ac97(dev, 0x1a, 0x0404); /* Record select */
 149        stk1160_write_ac97(dev, 0x02, 0x0000); /* Master volume */
 150        stk1160_write_ac97(dev, 0x1c, 0x0808); /* Record gain */
 151
 152#ifdef DEBUG
 153        stk1160_ac97_dump_regs(dev);
 154#endif
 155}
 156