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![Takashi Iwai](/assets/img/avatar_default.png)
There is an implicit rule to map between pin NID and port number on Intel HDMI/DP codec: the mapping is fixed only for NID 0x05, 0x06 and 0x07. For avoiding the possible memory corruption, add a sanity check for the NID value and splat WARN_ON() for invalid accesses. Signed-off-by: Takashi Iwai <tiwai@suse.de>
355 lines
9.7 KiB
C
355 lines
9.7 KiB
C
/*
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* hdac_i915.c - routines for sync between HD-A core and i915 display driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/component.h>
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#include <drm/i915_component.h>
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#include <sound/core.h>
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#include <sound/hdaudio.h>
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#include <sound/hda_i915.h>
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static struct i915_audio_component *hdac_acomp;
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/**
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* snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
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* @bus: HDA core bus
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* @enable: enable or disable the wakeup
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function should be called during the chip reset, also called at
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* resume for updating STATESTS register read.
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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_set_codec_wakeup(struct hdac_bus *bus, bool enable)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp || !acomp->ops)
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return -ENODEV;
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if (!acomp->ops->codec_wake_override) {
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dev_warn(bus->dev,
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"Invalid codec wake callback\n");
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return 0;
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}
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dev_dbg(bus->dev, "%s codec wakeup\n",
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enable ? "enable" : "disable");
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acomp->ops->codec_wake_override(acomp->dev, enable);
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
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/**
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* snd_hdac_display_power - Power up / down the power refcount
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* @bus: HDA core bus
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* @enable: power up or down
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function manages a refcount and calls the i915 get_power() and
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* put_power() ops accordingly, toggling the codec wakeup, too.
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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_display_power(struct hdac_bus *bus, bool enable)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp || !acomp->ops)
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return -ENODEV;
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dev_dbg(bus->dev, "display power %s\n",
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enable ? "enable" : "disable");
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if (enable) {
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if (!bus->i915_power_refcount++) {
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acomp->ops->get_power(acomp->dev);
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snd_hdac_set_codec_wakeup(bus, true);
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snd_hdac_set_codec_wakeup(bus, false);
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}
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} else {
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WARN_ON(!bus->i915_power_refcount);
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if (!--bus->i915_power_refcount)
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acomp->ops->put_power(acomp->dev);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_display_power);
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/**
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* snd_hdac_get_display_clk - Get CDCLK in kHz
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function queries CDCLK value in kHz from the graphics driver and
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* returns the value. A negative code is returned in error.
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*/
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int snd_hdac_get_display_clk(struct hdac_bus *bus)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp || !acomp->ops)
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return -ENODEV;
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return acomp->ops->get_cdclk_freq(acomp->dev);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk);
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/* There is a fixed mapping between audio pin node and display port
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* on current Intel platforms:
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* Pin Widget 5 - PORT B (port = 1 in i915 driver)
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* Pin Widget 6 - PORT C (port = 2 in i915 driver)
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* Pin Widget 7 - PORT D (port = 3 in i915 driver)
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*/
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static int pin2port(hda_nid_t pin_nid)
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{
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if (WARN_ON(pin_nid < 5 || pin_nid > 7))
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return -1;
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return pin_nid - 4;
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}
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/**
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* snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
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* @bus: HDA core bus
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* @nid: the pin widget NID
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* @rate: the sample rate to set
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function sets N/CTS value based on the given sample rate.
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* Returns zero for success, or a negative error code.
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*/
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int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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int port;
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if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
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return -ENODEV;
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port = pin2port(nid);
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if (port < 0)
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return -EINVAL;
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return acomp->ops->sync_audio_rate(acomp->dev, port, rate);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
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/**
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* snd_hdac_acomp_get_eld - Get the audio state and ELD via component
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* @bus: HDA core bus
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* @nid: the pin widget NID
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* @audio_enabled: the pointer to store the current audio state
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* @buffer: the buffer pointer to store ELD bytes
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* @max_bytes: the max bytes to be stored on @buffer
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function queries the current state of the audio on the given
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* digital port and fetches the ELD bytes onto the given buffer.
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* It returns the number of bytes for the total ELD data, zero for
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* invalid ELD, or a negative error code.
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*
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* The return size is the total bytes required for the whole ELD bytes,
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* thus it may be over @max_bytes. If it's over @max_bytes, it implies
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* that only a part of ELD bytes have been fetched.
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*/
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int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
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bool *audio_enabled, char *buffer, int max_bytes)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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int port;
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if (!acomp || !acomp->ops || !acomp->ops->get_eld)
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return -ENODEV;
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port = pin2port(nid);
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if (port < 0)
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return -EINVAL;
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return acomp->ops->get_eld(acomp->dev, port, audio_enabled,
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buffer, max_bytes);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
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static int hdac_component_master_bind(struct device *dev)
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{
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struct i915_audio_component *acomp = hdac_acomp;
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int ret;
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ret = component_bind_all(dev, acomp);
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if (ret < 0)
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return ret;
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if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
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acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
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ret = -EINVAL;
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goto out_unbind;
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}
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/*
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* Atm, we don't support dynamic unbinding initiated by the child
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* component, so pin its containing module until we unbind.
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*/
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if (!try_module_get(acomp->ops->owner)) {
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ret = -ENODEV;
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goto out_unbind;
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}
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return 0;
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out_unbind:
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component_unbind_all(dev, acomp);
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return ret;
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}
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static void hdac_component_master_unbind(struct device *dev)
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{
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struct i915_audio_component *acomp = hdac_acomp;
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module_put(acomp->ops->owner);
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component_unbind_all(dev, acomp);
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WARN_ON(acomp->ops || acomp->dev);
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}
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static const struct component_master_ops hdac_component_master_ops = {
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.bind = hdac_component_master_bind,
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.unbind = hdac_component_master_unbind,
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};
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static int hdac_component_master_match(struct device *dev, void *data)
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{
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/* i915 is the only supported component */
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return !strcmp(dev->driver->name, "i915");
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}
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/**
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* snd_hdac_i915_register_notifier - Register i915 audio component ops
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* @aops: i915 audio component ops
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function sets the given ops to be called by the i915 graphics driver.
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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_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
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{
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if (WARN_ON(!hdac_acomp))
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return -ENODEV;
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hdac_acomp->audio_ops = aops;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
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/**
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* snd_hdac_i915_init - Initialize i915 audio component
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function initializes and sets up the audio component to communicate
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* with i915 graphics driver.
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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_i915_init(struct hdac_bus *bus)
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{
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struct component_match *match = NULL;
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struct device *dev = bus->dev;
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struct i915_audio_component *acomp;
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int ret;
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acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
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if (!acomp)
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return -ENOMEM;
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bus->audio_component = acomp;
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hdac_acomp = acomp;
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component_match_add(dev, &match, hdac_component_master_match, bus);
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ret = component_master_add_with_match(dev, &hdac_component_master_ops,
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match);
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if (ret < 0)
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goto out_err;
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/*
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* Atm, we don't support deferring the component binding, so make sure
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* i915 is loaded and that the binding successfully completes.
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*/
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request_module("i915");
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if (!acomp->ops) {
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ret = -ENODEV;
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goto out_master_del;
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}
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dev_dbg(dev, "bound to i915 component master\n");
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return 0;
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out_master_del:
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component_master_del(dev, &hdac_component_master_ops);
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out_err:
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kfree(acomp);
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bus->audio_component = NULL;
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dev_info(dev, "failed to add i915 component master (%d)\n", ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
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/**
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* snd_hdac_i915_exit - Finalize i915 audio component
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function releases the i915 audio component that has been used.
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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_i915_exit(struct hdac_bus *bus)
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{
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struct device *dev = bus->dev;
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struct i915_audio_component *acomp = bus->audio_component;
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if (!acomp)
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return 0;
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WARN_ON(bus->i915_power_refcount);
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if (bus->i915_power_refcount > 0 && acomp->ops)
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acomp->ops->put_power(acomp->dev);
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component_master_del(dev, &hdac_component_master_ops);
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kfree(acomp);
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bus->audio_component = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);
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