cregit-Linux how code gets into the kernel

Release 4.11 drivers/media/usb/stk1160/stk1160-ac97.c

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Marcel Hasler77100.00%1100.00%
Total77100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Ezequiel García6387.50%133.33%
Marcel Hasler912.50%266.67%
Total72100.00%3100.00%

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Ezequiel García7382.02%133.33%
Marcel Hasler1617.98%266.67%
Total89100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Marcel Hasler8463.64%133.33%
Ezequiel García4735.61%133.33%
Takashi Iwai10.76%133.33%
Total132100.00%3100.00%

#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); }

Contributors

PersonTokensPropCommitsCommitProp
Marcel Hasler3196.88%150.00%
Mauro Carvalho Chehab13.12%150.00%
Total32100.00%2100.00%


static int stk1160_has_ac97(struct stk1160 *dev) { u8 value; stk1160_read_reg(dev, STK1160_POSV_L, &value); return !(value & STK1160_POSV_L_ACSYNC); }

Contributors

PersonTokensPropCommitsCommitProp
Marcel Hasler3196.88%150.00%
Mauro Carvalho Chehab13.12%150.00%
Total32100.00%2100.00%


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 }

Contributors

PersonTokensPropCommitsCommitProp
Marcel Hasler12676.36%266.67%
Ezequiel García3923.64%133.33%
Total165100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Marcel Hasler38362.38%350.00%
Ezequiel García22837.13%116.67%
Mauro Carvalho Chehab20.33%116.67%
Takashi Iwai10.16%116.67%
Total614100.00%6100.00%
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