1 /* 2 * STK1160 driver 3 * 4 * Copyright (C) 2012 Ezequiel Garcia 5 * <elezegarcia--a.t--gmail.com> 6 * 7 * Copyright (C) 2016 Marcel Hasler 8 * <mahasler--a.t--gmail.com> 9 * 10 * Based on Easycap driver by R.M. Thomas 11 * Copyright (C) 2010 R.M. Thomas 12 * <rmthomas--a.t--sciolus.org> 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 */ 25 26 #include <linux/delay.h> 27 28 #include "stk1160.h" 29 #include "stk1160-reg.h" 30 31 static int stk1160_ac97_wait_transfer_complete(struct stk1160 *dev) 32 { 33 unsigned long timeout = jiffies + msecs_to_jiffies(STK1160_AC97_TIMEOUT); 34 u8 value; 35 36 /* Wait for AC97 transfer to complete */ 37 while (time_is_after_jiffies(timeout)) { 38 stk1160_read_reg(dev, STK1160_AC97CTL_0, &value); 39 40 if (!(value & (STK1160_AC97CTL_0_CR | STK1160_AC97CTL_0_CW))) 41 return 0; 42 43 usleep_range(50, 100); 44 } 45 46 stk1160_err("AC97 transfer took too long, this should never happen!"); 47 return -EBUSY; 48 } 49 50 static void stk1160_write_ac97(struct stk1160 *dev, u16 reg, u16 value) 51 { 52 /* Set codec register address */ 53 stk1160_write_reg(dev, STK1160_AC97_ADDR, reg); 54 55 /* Set codec command */ 56 stk1160_write_reg(dev, STK1160_AC97_CMD, value & 0xff); 57 stk1160_write_reg(dev, STK1160_AC97_CMD + 1, (value & 0xff00) >> 8); 58 59 /* Set command write bit to initiate write operation */ 60 stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c); 61 62 /* Wait for command write bit to be cleared */ 63 stk1160_ac97_wait_transfer_complete(dev); 64 } 65 66 #ifdef DEBUG 67 static u16 stk1160_read_ac97(struct stk1160 *dev, u16 reg) 68 { 69 u8 vall = 0; 70 u8 valh = 0; 71 72 /* Set codec register address */ 73 stk1160_write_reg(dev, STK1160_AC97_ADDR, reg); 74 75 /* Set command read bit to initiate read operation */ 76 stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8b); 77 78 /* Wait for command read bit to be cleared */ 79 if (stk1160_ac97_wait_transfer_complete(dev) < 0) 80 return 0; 81 82 83 /* Retrieve register value */ 84 stk1160_read_reg(dev, STK1160_AC97_CMD, &vall); 85 stk1160_read_reg(dev, STK1160_AC97_CMD + 1, &valh); 86 87 return (valh << 8) | vall; 88 } 89 90 void stk1160_ac97_dump_regs(struct stk1160 *dev) 91 { 92 u16 value; 93 94 value = stk1160_read_ac97(dev, 0x12); /* CD volume */ 95 stk1160_dbg("0x12 == 0x%04x", value); 96 97 value = stk1160_read_ac97(dev, 0x10); /* Line-in volume */ 98 stk1160_dbg("0x10 == 0x%04x", value); 99 100 value = stk1160_read_ac97(dev, 0x0e); /* MIC volume (mono) */ 101 stk1160_dbg("0x0e == 0x%04x", value); 102 103 value = stk1160_read_ac97(dev, 0x16); /* Aux volume */ 104 stk1160_dbg("0x16 == 0x%04x", value); 105 106 value = stk1160_read_ac97(dev, 0x1a); /* Record select */ 107 stk1160_dbg("0x1a == 0x%04x", value); 108 109 value = stk1160_read_ac97(dev, 0x02); /* Master volume */ 110 stk1160_dbg("0x02 == 0x%04x", value); 111 112 value = stk1160_read_ac97(dev, 0x1c); /* Record gain */ 113 stk1160_dbg("0x1c == 0x%04x", value); 114 } 115 #endif 116 117 static int stk1160_has_audio(struct stk1160 *dev) 118 { 119 u8 value; 120 121 stk1160_read_reg(dev, STK1160_POSV_L, &value); 122 return !(value & STK1160_POSV_L_ACDOUT); 123 } 124 125 static int stk1160_has_ac97(struct stk1160 *dev) 126 { 127 u8 value; 128 129 stk1160_read_reg(dev, STK1160_POSV_L, &value); 130 return !(value & STK1160_POSV_L_ACSYNC); 131 } 132 133 void stk1160_ac97_setup(struct stk1160 *dev) 134 { 135 if (!stk1160_has_audio(dev)) { 136 stk1160_info("Device doesn't support audio, skipping AC97 setup."); 137 return; 138 } 139 140 if (!stk1160_has_ac97(dev)) { 141 stk1160_info("Device uses internal 8-bit ADC, skipping AC97 setup."); 142 return; 143 } 144 145 /* Two-step reset AC97 interface and hardware codec */ 146 stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x94); 147 stk1160_write_reg(dev, STK1160_AC97CTL_0, 0x8c); 148 149 /* Set 16-bit audio data and choose L&R channel*/ 150 stk1160_write_reg(dev, STK1160_AC97CTL_1 + 2, 0x01); 151 stk1160_write_reg(dev, STK1160_AC97CTL_1 + 3, 0x00); 152 153 /* Setup channels */ 154 stk1160_write_ac97(dev, 0x12, 0x8808); /* CD volume */ 155 stk1160_write_ac97(dev, 0x10, 0x0808); /* Line-in volume */ 156 stk1160_write_ac97(dev, 0x0e, 0x0008); /* MIC volume (mono) */ 157 stk1160_write_ac97(dev, 0x16, 0x0808); /* Aux volume */ 158 stk1160_write_ac97(dev, 0x1a, 0x0404); /* Record select */ 159 stk1160_write_ac97(dev, 0x02, 0x0000); /* Master volume */ 160 stk1160_write_ac97(dev, 0x1c, 0x0808); /* Record gain */ 161 162 #ifdef DEBUG 163 stk1160_ac97_dump_regs(dev); 164 #endif 165 } 166