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 21 static 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 40 static 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 57 static 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 80 void 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 106 107 static 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 } 114 115 static 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 } 122 123 void 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