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Release 4.8 sound/hda/hdac_regmap.c

Directory: sound/hda
/*
 * Regmap support for HD-audio verbs
 *
 * A virtual register is translated to one or more hda verbs for write,
 * vice versa for read.
 *
 * A few limitations:
 * - Provided for not all verbs but only subset standard non-volatile verbs.
 * - For reading, only AC_VERB_GET_* variants can be used.
 * - For writing, mapped to the *corresponding* AC_VERB_SET_* variants,
 *   so can't handle asymmetric verbs for read and write
 */

#include <linux/slab.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/export.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <sound/core.h>
#include <sound/hdaudio.h>
#include <sound/hda_regmap.h>


static int codec_pm_lock(struct hdac_device *codec) { return snd_hdac_keep_power_up(codec); }

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static void codec_pm_unlock(struct hdac_device *codec, int lock) { if (lock == 1) snd_hdac_power_down_pm(codec); }

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#define get_verb(reg) (((reg) >> 8) & 0xfff)
static bool hda_volatile_reg(struct device *dev, unsigned int reg) { struct hdac_device *codec = dev_to_hdac_dev(dev); unsigned int verb = get_verb(reg); switch (verb) { case AC_VERB_GET_PROC_COEF: return !codec->cache_coef; case AC_VERB_GET_COEF_INDEX: case AC_VERB_GET_PROC_STATE: case AC_VERB_GET_POWER_STATE: case AC_VERB_GET_PIN_SENSE: case AC_VERB_GET_HDMI_DIP_SIZE: case AC_VERB_GET_HDMI_ELDD: case AC_VERB_GET_HDMI_DIP_INDEX: case AC_VERB_GET_HDMI_DIP_DATA: case AC_VERB_GET_HDMI_DIP_XMIT: case AC_VERB_GET_HDMI_CP_CTRL: case AC_VERB_GET_HDMI_CHAN_SLOT: case AC_VERB_GET_DEVICE_SEL: case AC_VERB_GET_DEVICE_LIST: /* read-only volatile */ return true; } return false; }

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static bool hda_writeable_reg(struct device *dev, unsigned int reg) { struct hdac_device *codec = dev_to_hdac_dev(dev); unsigned int verb = get_verb(reg); int i; for (i = 0; i < codec->vendor_verbs.used; i++) { unsigned int *v = snd_array_elem(&codec->vendor_verbs, i); if (verb == *v) return true; } if (codec->caps_overwriting) return true; switch (verb & 0xf00) { case AC_VERB_GET_STREAM_FORMAT: case AC_VERB_GET_AMP_GAIN_MUTE: return true; case AC_VERB_GET_PROC_COEF: return codec->cache_coef; case 0xf00: break; default: return false; } switch (verb) { case AC_VERB_GET_CONNECT_SEL: case AC_VERB_GET_SDI_SELECT: case AC_VERB_GET_PIN_WIDGET_CONTROL: case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */ case AC_VERB_GET_BEEP_CONTROL: case AC_VERB_GET_EAPD_BTLENABLE: case AC_VERB_GET_DIGI_CONVERT_1: case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */ case AC_VERB_GET_VOLUME_KNOB_CONTROL: case AC_VERB_GET_GPIO_MASK: case AC_VERB_GET_GPIO_DIRECTION: case AC_VERB_GET_GPIO_DATA: /* not for volatile read */ case AC_VERB_GET_GPIO_WAKE_MASK: case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK: case AC_VERB_GET_GPIO_STICKY_MASK: return true; } return false; }

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static bool hda_readable_reg(struct device *dev, unsigned int reg) { struct hdac_device *codec = dev_to_hdac_dev(dev); unsigned int verb = get_verb(reg); if (codec->caps_overwriting) return true; switch (verb) { case AC_VERB_PARAMETERS: case AC_VERB_GET_CONNECT_LIST: case AC_VERB_GET_SUBSYSTEM_ID: return true; /* below are basically writable, but disabled for reducing unnecessary * writes at sync */ case AC_VERB_GET_CONFIG_DEFAULT: /* usually just read */ case AC_VERB_GET_CONV: /* managed in PCM code */ case AC_VERB_GET_CVT_CHAN_COUNT: /* managed in HDMI CA code */ return true; } return hda_writeable_reg(dev, reg); }

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/* * Stereo amp pseudo register: * for making easier to handle the stereo volume control, we provide a * fake register to deal both left and right channels by a single * (pseudo) register access. A verb consisting of SET_AMP_GAIN with * *both* SET_LEFT and SET_RIGHT bits takes a 16bit value, the lower 8bit * for the left and the upper 8bit for the right channel. */
static bool is_stereo_amp_verb(unsigned int reg) { if (((reg >> 8) & 0x700) != AC_VERB_SET_AMP_GAIN_MUTE) return false; return (reg & (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT)) == (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); }

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/* read a pseudo stereo amp register (16bit left+right) */
static int hda_reg_read_stereo_amp(struct hdac_device *codec, unsigned int reg, unsigned int *val) { unsigned int left, right; int err; reg &= ~(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_LEFT, 0, &left); if (err < 0) return err; err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_RIGHT, 0, &right); if (err < 0) return err; *val = left | (right << 8); return 0; }

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/* write a pseudo stereo amp register (16bit left+right) */
static int hda_reg_write_stereo_amp(struct hdac_device *codec, unsigned int reg, unsigned int val) { int err; unsigned int verb, left, right; verb = AC_VERB_SET_AMP_GAIN_MUTE << 8; if (reg & AC_AMP_GET_OUTPUT) verb |= AC_AMP_SET_OUTPUT; else verb |= AC_AMP_SET_INPUT | ((reg & 0xf) << 8); reg = (reg & ~0xfffff) | verb; left = val & 0xff; right = (val >> 8) & 0xff; if (left == right) { reg |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT; return snd_hdac_exec_verb(codec, reg | left, 0, NULL); } err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_LEFT | left, 0, NULL); if (err < 0) return err; err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_RIGHT | right, 0, NULL); if (err < 0) return err; return 0; }

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/* read a pseudo coef register (16bit) */
static int hda_reg_read_coef(struct hdac_device *codec, unsigned int reg, unsigned int *val) { unsigned int verb; int err; if (!codec->cache_coef) return -EINVAL; /* LSB 8bit = coef index */ verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); err = snd_hdac_exec_verb(codec, verb, 0, NULL); if (err < 0) return err; verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8); return snd_hdac_exec_verb(codec, verb, 0, val); }

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/* write a pseudo coef register (16bit) */
static int hda_reg_write_coef(struct hdac_device *codec, unsigned int reg, unsigned int val) { unsigned int verb; int err; if (!codec->cache_coef) return -EINVAL; /* LSB 8bit = coef index */ verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); err = snd_hdac_exec_verb(codec, verb, 0, NULL); if (err < 0) return err; verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8) | (val & 0xffff); return snd_hdac_exec_verb(codec, verb, 0, NULL); }

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static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) { struct hdac_device *codec = context; int verb = get_verb(reg); int err; int pm_lock = 0; if (verb != AC_VERB_GET_POWER_STATE) { pm_lock = codec_pm_lock(codec); if (pm_lock < 0) return -EAGAIN; } reg |= (codec->addr << 28); if (is_stereo_amp_verb(reg)) { err = hda_reg_read_stereo_amp(codec, reg, val); goto out; } if (verb == AC_VERB_GET_PROC_COEF) { err = hda_reg_read_coef(codec, reg, val); goto out; } if ((verb & 0x700) == AC_VERB_SET_AMP_GAIN_MUTE) reg &= ~AC_AMP_FAKE_MUTE; err = snd_hdac_exec_verb(codec, reg, 0, val); if (err < 0) goto out; /* special handling for asymmetric reads */ if (verb == AC_VERB_GET_POWER_STATE) { if (*val & AC_PWRST_ERROR) *val = -1; else /* take only the actual state */ *val = (*val >> 4) & 0x0f; } out: codec_pm_unlock(codec, pm_lock); return err; }

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static int hda_reg_write(void *context, unsigned int reg, unsigned int val) { struct hdac_device *codec = context; unsigned int verb; int i, bytes, err; int pm_lock = 0; if (codec->caps_overwriting) return 0; reg &= ~0x00080000U; /* drop GET bit */ reg |= (codec->addr << 28); verb = get_verb(reg); if (verb != AC_VERB_SET_POWER_STATE) { pm_lock = codec_pm_lock(codec); if (pm_lock < 0) return codec->lazy_cache ? 0 : -EAGAIN; } if (is_stereo_amp_verb(reg)) { err = hda_reg_write_stereo_amp(codec, reg, val); goto out; } if (verb == AC_VERB_SET_PROC_COEF) { err = hda_reg_write_coef(codec, reg, val); goto out; } switch (verb & 0xf00) { case AC_VERB_SET_AMP_GAIN_MUTE: if ((reg & AC_AMP_FAKE_MUTE) && (val & AC_AMP_MUTE)) val = 0; verb = AC_VERB_SET_AMP_GAIN_MUTE; if (reg & AC_AMP_GET_LEFT) verb |= AC_AMP_SET_LEFT >> 8; else verb |= AC_AMP_SET_RIGHT >> 8; if (reg & AC_AMP_GET_OUTPUT) { verb |= AC_AMP_SET_OUTPUT >> 8; } else { verb |= AC_AMP_SET_INPUT >> 8; verb |= reg & 0xf; } break; } switch (verb) { case AC_VERB_SET_DIGI_CONVERT_1: bytes = 2; break; case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: bytes = 4; break; default: bytes = 1; break; } for (i = 0; i < bytes; i++) { reg &= ~0xfffff; reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); err = snd_hdac_exec_verb(codec, reg, 0, NULL); if (err < 0) goto out; } out: codec_pm_unlock(codec, pm_lock); return err; }

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static const struct regmap_config hda_regmap_cfg = { .name = "hdaudio", .reg_bits = 32, .val_bits = 32, .max_register = 0xfffffff, .writeable_reg = hda_writeable_reg, .readable_reg = hda_readable_reg, .volatile_reg = hda_volatile_reg, .cache_type = REGCACHE_RBTREE, .reg_read = hda_reg_read, .reg_write = hda_reg_write, .use_single_rw = true, }; /** * snd_hdac_regmap_init - Initialize regmap for HDA register accesses * @codec: the codec object * * Returns zero for success or a negative error code. */
int snd_hdac_regmap_init(struct hdac_device *codec) { struct regmap *regmap; regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); if (IS_ERR(regmap)) return PTR_ERR(regmap); codec->regmap = regmap; snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8); return 0; }

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EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); /** * snd_hdac_regmap_init - Release the regmap from HDA codec * @codec: the codec object */
void snd_hdac_regmap_exit(struct hdac_device *codec) { if (codec->regmap) { regmap_exit(codec->regmap); codec->regmap = NULL; snd_array_free(&codec->vendor_verbs); } }

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EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); /** * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap * @codec: the codec object * @verb: verb to allow accessing via regmap * * Returns zero for success or a negative error code. */
int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec, unsigned int verb) { unsigned int *p = snd_array_new(&codec->vendor_verbs); if (!p) return -ENOMEM; *p = verb | 0x800; /* set GET bit */ return 0; }

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EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb); /* * helper functions */ /* write a pseudo-register value (w/o power sequence) */
static int reg_raw_write(struct hdac_device *codec, unsigned int reg, unsigned int val) { if (!codec->regmap) return hda_reg_write(codec, reg, val); else return regmap_write(codec->regmap, reg, val); }

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/** * snd_hdac_regmap_write_raw - write a pseudo register with power mgmt * @codec: the codec object * @reg: pseudo register * @val: value to write * * Returns zero if successful or a negative error code. */
int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, unsigned int val) { int err; err = reg_raw_write(codec, reg, val); if (err == -EAGAIN) { err = snd_hdac_power_up_pm(codec); if (err >= 0) err = reg_raw_write(codec, reg, val); snd_hdac_power_down_pm(codec); } return err; }

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EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw);
static int reg_raw_read(struct hdac_device *codec, unsigned int reg, unsigned int *val, bool uncached) { if (uncached || !codec->regmap) return hda_reg_read(codec, reg, val); else return regmap_read(codec->regmap, reg, val); }

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static int __snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, unsigned int *val, bool uncached) { int err; err = reg_raw_read(codec, reg, val, uncached); if (err == -EAGAIN) { err = snd_hdac_power_up_pm(codec); if (err >= 0) err = reg_raw_read(codec, reg, val, uncached); snd_hdac_power_down_pm(codec); } return err; }

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/** * snd_hdac_regmap_read_raw - read a pseudo register with power mgmt * @codec: the codec object * @reg: pseudo register * @val: pointer to store the read value * * Returns zero if successful or a negative error code. */
int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, unsigned int *val) { return __snd_hdac_regmap_read_raw(codec, reg, val, false); }

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EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); /* Works like snd_hdac_regmap_read_raw(), but this doesn't read from the * cache but always via hda verbs. */
int snd_hdac_regmap_read_raw_uncached(struct hdac_device *codec, unsigned int reg, unsigned int *val) { return __snd_hdac_regmap_read_raw(codec, reg, val, true); }

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/** * snd_hdac_regmap_update_raw - update a pseudo register with power mgmt * @codec: the codec object * @reg: pseudo register * @mask: bit mask to udpate * @val: value to update * * Returns zero if successful or a negative error code. */
int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, unsigned int mask, unsigned int val) { unsigned int orig; int err; val &= mask; err = snd_hdac_regmap_read_raw(codec, reg, &orig); if (err < 0) return err; val |= orig & ~mask; if (val == orig) return 0; err = snd_hdac_regmap_write_raw(codec, reg, val); if (err < 0) return err; return 1; }

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EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw);

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Directory: sound/hda
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