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606 lines
15 KiB
606 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Regmap support for HD-audio verbs |
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* |
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* A virtual register is translated to one or more hda verbs for write, |
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* vice versa for read. |
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* |
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* A few limitations: |
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* - Provided for not all verbs but only subset standard non-volatile verbs. |
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* - For reading, only AC_VERB_GET_* variants can be used. |
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* - For writing, mapped to the *corresponding* AC_VERB_SET_* variants, |
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* so can't handle asymmetric verbs for read and write |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/device.h> |
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#include <linux/regmap.h> |
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#include <linux/export.h> |
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#include <linux/pm.h> |
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#include <linux/pm_runtime.h> |
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#include <sound/core.h> |
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#include <sound/hdaudio.h> |
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#include <sound/hda_regmap.h> |
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#include "local.h" |
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static int codec_pm_lock(struct hdac_device *codec) |
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{ |
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return snd_hdac_keep_power_up(codec); |
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} |
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static void codec_pm_unlock(struct hdac_device *codec, int lock) |
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{ |
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if (lock == 1) |
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snd_hdac_power_down_pm(codec); |
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} |
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|
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#define get_verb(reg) (((reg) >> 8) & 0xfff) |
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|
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static bool hda_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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struct hdac_device *codec = dev_to_hdac_dev(dev); |
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unsigned int verb = get_verb(reg); |
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switch (verb) { |
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case AC_VERB_GET_PROC_COEF: |
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return !codec->cache_coef; |
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case AC_VERB_GET_COEF_INDEX: |
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case AC_VERB_GET_PROC_STATE: |
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case AC_VERB_GET_POWER_STATE: |
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case AC_VERB_GET_PIN_SENSE: |
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case AC_VERB_GET_HDMI_DIP_SIZE: |
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case AC_VERB_GET_HDMI_ELDD: |
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case AC_VERB_GET_HDMI_DIP_INDEX: |
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case AC_VERB_GET_HDMI_DIP_DATA: |
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case AC_VERB_GET_HDMI_DIP_XMIT: |
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case AC_VERB_GET_HDMI_CP_CTRL: |
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case AC_VERB_GET_HDMI_CHAN_SLOT: |
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case AC_VERB_GET_DEVICE_SEL: |
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case AC_VERB_GET_DEVICE_LIST: /* read-only volatile */ |
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return true; |
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} |
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|
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return false; |
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} |
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static bool hda_writeable_reg(struct device *dev, unsigned int reg) |
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{ |
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struct hdac_device *codec = dev_to_hdac_dev(dev); |
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unsigned int verb = get_verb(reg); |
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const unsigned int *v; |
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int i; |
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snd_array_for_each(&codec->vendor_verbs, i, v) { |
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if (verb == *v) |
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return true; |
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} |
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if (codec->caps_overwriting) |
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return true; |
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switch (verb & 0xf00) { |
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case AC_VERB_GET_STREAM_FORMAT: |
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case AC_VERB_GET_AMP_GAIN_MUTE: |
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return true; |
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case AC_VERB_GET_PROC_COEF: |
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return codec->cache_coef; |
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case 0xf00: |
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break; |
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default: |
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return false; |
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} |
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switch (verb) { |
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case AC_VERB_GET_CONNECT_SEL: |
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case AC_VERB_GET_SDI_SELECT: |
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case AC_VERB_GET_PIN_WIDGET_CONTROL: |
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case AC_VERB_GET_UNSOLICITED_RESPONSE: /* only as SET_UNSOLICITED_ENABLE */ |
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case AC_VERB_GET_BEEP_CONTROL: |
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case AC_VERB_GET_EAPD_BTLENABLE: |
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case AC_VERB_GET_DIGI_CONVERT_1: |
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case AC_VERB_GET_DIGI_CONVERT_2: /* only for beep control */ |
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case AC_VERB_GET_VOLUME_KNOB_CONTROL: |
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case AC_VERB_GET_GPIO_MASK: |
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case AC_VERB_GET_GPIO_DIRECTION: |
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case AC_VERB_GET_GPIO_DATA: /* not for volatile read */ |
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case AC_VERB_GET_GPIO_WAKE_MASK: |
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case AC_VERB_GET_GPIO_UNSOLICITED_RSP_MASK: |
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case AC_VERB_GET_GPIO_STICKY_MASK: |
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return true; |
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} |
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return false; |
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} |
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static bool hda_readable_reg(struct device *dev, unsigned int reg) |
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{ |
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struct hdac_device *codec = dev_to_hdac_dev(dev); |
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unsigned int verb = get_verb(reg); |
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if (codec->caps_overwriting) |
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return true; |
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switch (verb) { |
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case AC_VERB_PARAMETERS: |
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case AC_VERB_GET_CONNECT_LIST: |
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case AC_VERB_GET_SUBSYSTEM_ID: |
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return true; |
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/* below are basically writable, but disabled for reducing unnecessary |
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* writes at sync |
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*/ |
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case AC_VERB_GET_CONFIG_DEFAULT: /* usually just read */ |
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case AC_VERB_GET_CONV: /* managed in PCM code */ |
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case AC_VERB_GET_CVT_CHAN_COUNT: /* managed in HDMI CA code */ |
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return true; |
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} |
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return hda_writeable_reg(dev, reg); |
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} |
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/* |
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* Stereo amp pseudo register: |
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* for making easier to handle the stereo volume control, we provide a |
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* fake register to deal both left and right channels by a single |
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* (pseudo) register access. A verb consisting of SET_AMP_GAIN with |
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* *both* SET_LEFT and SET_RIGHT bits takes a 16bit value, the lower 8bit |
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* for the left and the upper 8bit for the right channel. |
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*/ |
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static bool is_stereo_amp_verb(unsigned int reg) |
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{ |
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if (((reg >> 8) & 0x700) != AC_VERB_SET_AMP_GAIN_MUTE) |
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return false; |
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return (reg & (AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT)) == |
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(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); |
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} |
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/* read a pseudo stereo amp register (16bit left+right) */ |
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static int hda_reg_read_stereo_amp(struct hdac_device *codec, |
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unsigned int reg, unsigned int *val) |
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{ |
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unsigned int left, right; |
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int err; |
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reg &= ~(AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT); |
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err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_LEFT, 0, &left); |
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if (err < 0) |
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return err; |
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err = snd_hdac_exec_verb(codec, reg | AC_AMP_GET_RIGHT, 0, &right); |
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if (err < 0) |
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return err; |
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*val = left | (right << 8); |
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return 0; |
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} |
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/* write a pseudo stereo amp register (16bit left+right) */ |
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static int hda_reg_write_stereo_amp(struct hdac_device *codec, |
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unsigned int reg, unsigned int val) |
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{ |
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int err; |
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unsigned int verb, left, right; |
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verb = AC_VERB_SET_AMP_GAIN_MUTE << 8; |
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if (reg & AC_AMP_GET_OUTPUT) |
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verb |= AC_AMP_SET_OUTPUT; |
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else |
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verb |= AC_AMP_SET_INPUT | ((reg & 0xf) << 8); |
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reg = (reg & ~0xfffff) | verb; |
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left = val & 0xff; |
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right = (val >> 8) & 0xff; |
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if (left == right) { |
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reg |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT; |
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return snd_hdac_exec_verb(codec, reg | left, 0, NULL); |
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} |
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err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_LEFT | left, 0, NULL); |
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if (err < 0) |
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return err; |
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err = snd_hdac_exec_verb(codec, reg | AC_AMP_SET_RIGHT | right, 0, NULL); |
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if (err < 0) |
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return err; |
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return 0; |
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} |
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/* read a pseudo coef register (16bit) */ |
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static int hda_reg_read_coef(struct hdac_device *codec, unsigned int reg, |
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unsigned int *val) |
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{ |
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unsigned int verb; |
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int err; |
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if (!codec->cache_coef) |
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return -EINVAL; |
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/* LSB 8bit = coef index */ |
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verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); |
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err = snd_hdac_exec_verb(codec, verb, 0, NULL); |
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if (err < 0) |
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return err; |
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verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8); |
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return snd_hdac_exec_verb(codec, verb, 0, val); |
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} |
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/* write a pseudo coef register (16bit) */ |
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static int hda_reg_write_coef(struct hdac_device *codec, unsigned int reg, |
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unsigned int val) |
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{ |
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unsigned int verb; |
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int err; |
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if (!codec->cache_coef) |
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return -EINVAL; |
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/* LSB 8bit = coef index */ |
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verb = (reg & ~0xfff00) | (AC_VERB_SET_COEF_INDEX << 8); |
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err = snd_hdac_exec_verb(codec, verb, 0, NULL); |
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if (err < 0) |
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return err; |
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verb = (reg & ~0xfffff) | (AC_VERB_GET_COEF_INDEX << 8) | |
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(val & 0xffff); |
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return snd_hdac_exec_verb(codec, verb, 0, NULL); |
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} |
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static int hda_reg_read(void *context, unsigned int reg, unsigned int *val) |
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{ |
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struct hdac_device *codec = context; |
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int verb = get_verb(reg); |
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int err; |
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int pm_lock = 0; |
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if (verb != AC_VERB_GET_POWER_STATE) { |
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pm_lock = codec_pm_lock(codec); |
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if (pm_lock < 0) |
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return -EAGAIN; |
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} |
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reg |= (codec->addr << 28); |
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if (is_stereo_amp_verb(reg)) { |
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err = hda_reg_read_stereo_amp(codec, reg, val); |
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goto out; |
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} |
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if (verb == AC_VERB_GET_PROC_COEF) { |
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err = hda_reg_read_coef(codec, reg, val); |
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goto out; |
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} |
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if ((verb & 0x700) == AC_VERB_SET_AMP_GAIN_MUTE) |
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reg &= ~AC_AMP_FAKE_MUTE; |
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err = snd_hdac_exec_verb(codec, reg, 0, val); |
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if (err < 0) |
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goto out; |
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/* special handling for asymmetric reads */ |
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if (verb == AC_VERB_GET_POWER_STATE) { |
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if (*val & AC_PWRST_ERROR) |
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*val = -1; |
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else /* take only the actual state */ |
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*val = (*val >> 4) & 0x0f; |
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} |
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out: |
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codec_pm_unlock(codec, pm_lock); |
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return err; |
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} |
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static int hda_reg_write(void *context, unsigned int reg, unsigned int val) |
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{ |
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struct hdac_device *codec = context; |
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unsigned int verb; |
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int i, bytes, err; |
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int pm_lock = 0; |
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if (codec->caps_overwriting) |
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return 0; |
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reg &= ~0x00080000U; /* drop GET bit */ |
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reg |= (codec->addr << 28); |
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verb = get_verb(reg); |
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if (verb != AC_VERB_SET_POWER_STATE) { |
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pm_lock = codec_pm_lock(codec); |
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if (pm_lock < 0) |
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return codec->lazy_cache ? 0 : -EAGAIN; |
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} |
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if (is_stereo_amp_verb(reg)) { |
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err = hda_reg_write_stereo_amp(codec, reg, val); |
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goto out; |
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} |
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if (verb == AC_VERB_SET_PROC_COEF) { |
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err = hda_reg_write_coef(codec, reg, val); |
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goto out; |
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} |
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switch (verb & 0xf00) { |
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case AC_VERB_SET_AMP_GAIN_MUTE: |
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if ((reg & AC_AMP_FAKE_MUTE) && (val & AC_AMP_MUTE)) |
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val = 0; |
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verb = AC_VERB_SET_AMP_GAIN_MUTE; |
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if (reg & AC_AMP_GET_LEFT) |
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verb |= AC_AMP_SET_LEFT >> 8; |
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else |
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verb |= AC_AMP_SET_RIGHT >> 8; |
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if (reg & AC_AMP_GET_OUTPUT) { |
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verb |= AC_AMP_SET_OUTPUT >> 8; |
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} else { |
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verb |= AC_AMP_SET_INPUT >> 8; |
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verb |= reg & 0xf; |
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} |
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break; |
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} |
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switch (verb) { |
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case AC_VERB_SET_DIGI_CONVERT_1: |
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bytes = 2; |
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break; |
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case AC_VERB_SET_CONFIG_DEFAULT_BYTES_0: |
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bytes = 4; |
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break; |
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default: |
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bytes = 1; |
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break; |
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} |
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for (i = 0; i < bytes; i++) { |
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reg &= ~0xfffff; |
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reg |= (verb + i) << 8 | ((val >> (8 * i)) & 0xff); |
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err = snd_hdac_exec_verb(codec, reg, 0, NULL); |
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if (err < 0) |
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goto out; |
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} |
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out: |
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codec_pm_unlock(codec, pm_lock); |
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return err; |
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} |
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static const struct regmap_config hda_regmap_cfg = { |
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.name = "hdaudio", |
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.reg_bits = 32, |
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.val_bits = 32, |
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.max_register = 0xfffffff, |
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.writeable_reg = hda_writeable_reg, |
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.readable_reg = hda_readable_reg, |
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.volatile_reg = hda_volatile_reg, |
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.cache_type = REGCACHE_RBTREE, |
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.reg_read = hda_reg_read, |
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.reg_write = hda_reg_write, |
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.use_single_read = true, |
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.use_single_write = true, |
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.disable_locking = true, |
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}; |
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/** |
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* snd_hdac_regmap_init - Initialize regmap for HDA register accesses |
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* @codec: the codec object |
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* |
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* Returns zero for success or a negative error code. |
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*/ |
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int snd_hdac_regmap_init(struct hdac_device *codec) |
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{ |
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struct regmap *regmap; |
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regmap = regmap_init(&codec->dev, NULL, codec, &hda_regmap_cfg); |
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if (IS_ERR(regmap)) |
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return PTR_ERR(regmap); |
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codec->regmap = regmap; |
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snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_init); |
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/** |
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* snd_hdac_regmap_exit - Release the regmap from HDA codec |
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* @codec: the codec object |
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*/ |
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void snd_hdac_regmap_exit(struct hdac_device *codec) |
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{ |
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if (codec->regmap) { |
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regmap_exit(codec->regmap); |
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codec->regmap = NULL; |
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snd_array_free(&codec->vendor_verbs); |
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} |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit); |
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/** |
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* snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap |
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* @codec: the codec object |
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* @verb: verb to allow accessing via regmap |
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* |
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* Returns zero for success or a negative error code. |
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*/ |
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int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec, |
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unsigned int verb) |
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{ |
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unsigned int *p = snd_array_new(&codec->vendor_verbs); |
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if (!p) |
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return -ENOMEM; |
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*p = verb | 0x800; /* set GET bit */ |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb); |
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/* |
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* helper functions |
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*/ |
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/* write a pseudo-register value (w/o power sequence) */ |
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static int reg_raw_write(struct hdac_device *codec, unsigned int reg, |
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unsigned int val) |
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{ |
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int err; |
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mutex_lock(&codec->regmap_lock); |
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if (!codec->regmap) |
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err = hda_reg_write(codec, reg, val); |
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else |
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err = regmap_write(codec->regmap, reg, val); |
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mutex_unlock(&codec->regmap_lock); |
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return err; |
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} |
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/* a helper macro to call @func_call; retry with power-up if failed */ |
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#define CALL_RAW_FUNC(codec, func_call) \ |
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({ \ |
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int _err = func_call; \ |
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if (_err == -EAGAIN) { \ |
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_err = snd_hdac_power_up_pm(codec); \ |
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if (_err >= 0) \ |
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_err = func_call; \ |
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snd_hdac_power_down_pm(codec); \ |
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} \ |
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_err;}) |
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/** |
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* snd_hdac_regmap_write_raw - write a pseudo register with power mgmt |
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* @codec: the codec object |
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* @reg: pseudo register |
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* @val: value to write |
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* |
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* Returns zero if successful or a negative error code. |
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*/ |
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int snd_hdac_regmap_write_raw(struct hdac_device *codec, unsigned int reg, |
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unsigned int val) |
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{ |
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return CALL_RAW_FUNC(codec, reg_raw_write(codec, reg, val)); |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_write_raw); |
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static int reg_raw_read(struct hdac_device *codec, unsigned int reg, |
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unsigned int *val, bool uncached) |
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{ |
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int err; |
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mutex_lock(&codec->regmap_lock); |
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if (uncached || !codec->regmap) |
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err = hda_reg_read(codec, reg, val); |
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else |
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err = regmap_read(codec->regmap, reg, val); |
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mutex_unlock(&codec->regmap_lock); |
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return err; |
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} |
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static int __snd_hdac_regmap_read_raw(struct hdac_device *codec, |
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unsigned int reg, unsigned int *val, |
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bool uncached) |
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{ |
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return CALL_RAW_FUNC(codec, reg_raw_read(codec, reg, val, uncached)); |
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} |
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/** |
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* snd_hdac_regmap_read_raw - read a pseudo register with power mgmt |
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* @codec: the codec object |
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* @reg: pseudo register |
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* @val: pointer to store the read value |
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* |
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* Returns zero if successful or a negative error code. |
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*/ |
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int snd_hdac_regmap_read_raw(struct hdac_device *codec, unsigned int reg, |
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unsigned int *val) |
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{ |
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return __snd_hdac_regmap_read_raw(codec, reg, val, false); |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_read_raw); |
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|
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/* Works like snd_hdac_regmap_read_raw(), but this doesn't read from the |
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* cache but always via hda verbs. |
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*/ |
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int snd_hdac_regmap_read_raw_uncached(struct hdac_device *codec, |
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unsigned int reg, unsigned int *val) |
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{ |
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return __snd_hdac_regmap_read_raw(codec, reg, val, true); |
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} |
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static int reg_raw_update(struct hdac_device *codec, unsigned int reg, |
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unsigned int mask, unsigned int val) |
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{ |
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unsigned int orig; |
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bool change; |
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int err; |
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mutex_lock(&codec->regmap_lock); |
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if (codec->regmap) { |
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err = regmap_update_bits_check(codec->regmap, reg, mask, val, |
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&change); |
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if (!err) |
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err = change ? 1 : 0; |
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} else { |
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err = hda_reg_read(codec, reg, &orig); |
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if (!err) { |
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val &= mask; |
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val |= orig & ~mask; |
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if (val != orig) { |
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err = hda_reg_write(codec, reg, val); |
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if (!err) |
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err = 1; |
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} |
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} |
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} |
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mutex_unlock(&codec->regmap_lock); |
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return err; |
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} |
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|
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/** |
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* snd_hdac_regmap_update_raw - update a pseudo register with power mgmt |
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* @codec: the codec object |
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* @reg: pseudo register |
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* @mask: bit mask to update |
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* @val: value to update |
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* |
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* Returns zero if successful or a negative error code. |
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*/ |
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int snd_hdac_regmap_update_raw(struct hdac_device *codec, unsigned int reg, |
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unsigned int mask, unsigned int val) |
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{ |
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return CALL_RAW_FUNC(codec, reg_raw_update(codec, reg, mask, val)); |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); |
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|
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static int reg_raw_update_once(struct hdac_device *codec, unsigned int reg, |
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unsigned int mask, unsigned int val) |
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{ |
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unsigned int orig; |
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int err; |
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|
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if (!codec->regmap) |
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return reg_raw_update(codec, reg, mask, val); |
|
|
|
mutex_lock(&codec->regmap_lock); |
|
regcache_cache_only(codec->regmap, true); |
|
err = regmap_read(codec->regmap, reg, &orig); |
|
regcache_cache_only(codec->regmap, false); |
|
if (err < 0) |
|
err = regmap_update_bits(codec->regmap, reg, mask, val); |
|
mutex_unlock(&codec->regmap_lock); |
|
return err; |
|
} |
|
|
|
/** |
|
* snd_hdac_regmap_update_raw_once - initialize the register value only once |
|
* @codec: the codec object |
|
* @reg: pseudo register |
|
* @mask: bit mask to update |
|
* @val: value to update |
|
* |
|
* Performs the update of the register bits only once when the register |
|
* hasn't been initialized yet. Used in HD-audio legacy driver. |
|
* Returns zero if successful or a negative error code |
|
*/ |
|
int snd_hdac_regmap_update_raw_once(struct hdac_device *codec, unsigned int reg, |
|
unsigned int mask, unsigned int val) |
|
{ |
|
return CALL_RAW_FUNC(codec, reg_raw_update_once(codec, reg, mask, val)); |
|
} |
|
EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw_once); |
|
|
|
/** |
|
* snd_hdac_regmap_sync - sync out the cached values for PM resume |
|
* @codec: the codec object |
|
*/ |
|
void snd_hdac_regmap_sync(struct hdac_device *codec) |
|
{ |
|
if (codec->regmap) { |
|
mutex_lock(&codec->regmap_lock); |
|
regcache_sync(codec->regmap); |
|
mutex_unlock(&codec->regmap_lock); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(snd_hdac_regmap_sync);
|
|
|