diff options
Diffstat (limited to 'drivers/media/usb/stk1160/stk1160-ac97.c')
| -rw-r--r-- | drivers/media/usb/stk1160/stk1160-ac97.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/media/usb/stk1160/stk1160-ac97.c b/drivers/media/usb/stk1160/stk1160-ac97.c new file mode 100644 index 0000000000..79762db848 --- /dev/null +++ b/drivers/media/usb/stk1160/stk1160-ac97.c @@ -0,0 +1,155 @@ +// 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 +} |