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