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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * STK1160 driver4 *5 * Copyright (C) 2012 Ezequiel Garcia6 * <elezegarcia--a.t--gmail.com>7 *8 * Copyright (C) 2016 Marcel Hasler9 * <mahasler--a.t--gmail.com>10 *11 * Based on Easycap driver by R.M. Thomas12 * Copyright (C) 2010 R.M. Thomas13 * <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 DEBUG57static 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#endif106 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 DEBUG153 stk1160_ac97_dump_regs(dev);154#endif155}156