Merge branch 'thinkpad' into release
This commit is contained in:
Len Brown
commit
ea840aa2d0
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@ -1092,8 +1092,8 @@ WARNING:
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its level up and down at every change.
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Volume control
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--------------
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Volume control (Console Audio control)
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--------------------------------------
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procfs: /proc/acpi/ibm/volume
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ALSA: "ThinkPad Console Audio Control", default ID: "ThinkPadEC"
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@ -1110,9 +1110,53 @@ the desktop environment to just provide on-screen-display feedback.
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Software volume control should be done only in the main AC97/HDA
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mixer.
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This feature allows volume control on ThinkPad models with a digital
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volume knob (when available, not all models have it), as well as
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mute/unmute control. The available commands are:
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About the ThinkPad Console Audio control:
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ThinkPads have a built-in amplifier and muting circuit that drives the
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console headphone and speakers. This circuit is after the main AC97
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or HDA mixer in the audio path, and under exclusive control of the
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firmware.
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ThinkPads have three special hotkeys to interact with the console
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audio control: volume up, volume down and mute.
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It is worth noting that the normal way the mute function works (on
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ThinkPads that do not have a "mute LED") is:
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1. Press mute to mute. It will *always* mute, you can press it as
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many times as you want, and the sound will remain mute.
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2. Press either volume key to unmute the ThinkPad (it will _not_
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change the volume, it will just unmute).
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This is a very superior design when compared to the cheap software-only
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mute-toggle solution found on normal consumer laptops: you can be
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absolutely sure the ThinkPad will not make noise if you press the mute
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button, no matter the previous state.
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The IBM ThinkPads, and the earlier Lenovo ThinkPads have variable-gain
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amplifiers driving the speakers and headphone output, and the firmware
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also handles volume control for the headphone and speakers on these
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ThinkPads without any help from the operating system (this volume
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control stage exists after the main AC97 or HDA mixer in the audio
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path).
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The newer Lenovo models only have firmware mute control, and depend on
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the main HDA mixer to do volume control (which is done by the operating
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system). In this case, the volume keys are filtered out for unmute
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key press (there are some firmware bugs in this area) and delivered as
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normal key presses to the operating system (thinkpad-acpi is not
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involved).
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The ThinkPad-ACPI volume control:
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The preferred way to interact with the Console Audio control is the
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ALSA interface.
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The legacy procfs interface allows one to read the current state,
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and if volume control is enabled, accepts the following commands:
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echo up >/proc/acpi/ibm/volume
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echo down >/proc/acpi/ibm/volume
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@ -1121,12 +1165,10 @@ mute/unmute control. The available commands are:
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echo 'level <level>' >/proc/acpi/ibm/volume
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The <level> number range is 0 to 14 although not all of them may be
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distinct. The unmute the volume after the mute command, use either the
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distinct. To unmute the volume after the mute command, use either the
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up or down command (the level command will not unmute the volume), or
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the unmute command.
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The current volume level and mute state is shown in the file.
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You can use the volume_capabilities parameter to tell the driver
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whether your thinkpad has volume control or mute-only control:
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volume_capabilities=1 for mixers with mute and volume control,
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@ -231,8 +231,36 @@ config THINKPAD_ACPI
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This driver was formerly known as ibm-acpi.
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Extra functionality will be available if the rfkill (CONFIG_RFKILL)
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and/or ALSA (CONFIG_SND) subsystems are available in the kernel.
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Note that if you want ThinkPad-ACPI to be built-in instead of
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modular, ALSA and rfkill will also have to be built-in.
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If you have an IBM or Lenovo ThinkPad laptop, say Y or M here.
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config THINKPAD_ACPI_ALSA_SUPPORT
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bool "Console audio control ALSA interface"
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depends on THINKPAD_ACPI
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depends on SND
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depends on SND = y || THINKPAD_ACPI = SND
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default y
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---help---
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Enables monitoring of the built-in console audio output control
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(headphone and speakers), which is operated by the mute and (in
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some ThinkPad models) volume hotkeys.
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If this option is enabled, ThinkPad-ACPI will export an ALSA card
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with a single read-only mixer control, which should be used for
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on-screen-display feedback purposes by the Desktop Environment.
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Optionally, the driver will also allow software control (the
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ALSA mixer will be made read-write). Please refer to the driver
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documentation for details.
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All IBM models have both volume and mute control. Newer Lenovo
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models only have mute control (the volume hotkeys are just normal
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keys and volume control is done through the main HDA mixer).
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config THINKPAD_ACPI_DEBUGFACILITIES
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bool "Maintainer debug facilities"
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depends on THINKPAD_ACPI
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@ -6384,11 +6384,13 @@ static struct ibm_struct brightness_driver_data = {
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* and we leave them unchanged.
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*/
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#ifdef CONFIG_THINKPAD_ACPI_ALSA_SUPPORT
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#define TPACPI_ALSA_DRVNAME "ThinkPad EC"
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#define TPACPI_ALSA_SHRTNAME "ThinkPad Console Audio Control"
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#define TPACPI_ALSA_MIXERNAME TPACPI_ALSA_SHRTNAME
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static int alsa_index = SNDRV_DEFAULT_IDX1;
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static int alsa_index = ~((1 << (SNDRV_CARDS - 3)) - 1); /* last three slots */
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static char *alsa_id = "ThinkPadEC";
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static int alsa_enable = SNDRV_DEFAULT_ENABLE1;
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@ -6705,10 +6707,11 @@ static int __init volume_create_alsa_mixer(void)
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rc = snd_card_create(alsa_index, alsa_id, THIS_MODULE,
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sizeof(struct tpacpi_alsa_data), &card);
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if (rc < 0)
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return rc;
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if (!card)
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return -ENOMEM;
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if (rc < 0 || !card) {
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printk(TPACPI_ERR
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"Failed to create ALSA card structures: %d\n", rc);
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return 1;
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}
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BUG_ON(!card->private_data);
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data = card->private_data;
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@ -6741,8 +6744,9 @@ static int __init volume_create_alsa_mixer(void)
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rc = snd_ctl_add(card, ctl_vol);
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if (rc < 0) {
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printk(TPACPI_ERR
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"Failed to create ALSA volume control\n");
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goto err_out;
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"Failed to create ALSA volume control: %d\n",
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rc);
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goto err_exit;
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}
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data->ctl_vol_id = &ctl_vol->id;
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}
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@ -6750,22 +6754,25 @@ static int __init volume_create_alsa_mixer(void)
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ctl_mute = snd_ctl_new1(&volume_alsa_control_mute, NULL);
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rc = snd_ctl_add(card, ctl_mute);
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if (rc < 0) {
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printk(TPACPI_ERR "Failed to create ALSA mute control\n");
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goto err_out;
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printk(TPACPI_ERR "Failed to create ALSA mute control: %d\n",
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rc);
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goto err_exit;
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}
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data->ctl_mute_id = &ctl_mute->id;
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snd_card_set_dev(card, &tpacpi_pdev->dev);
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rc = snd_card_register(card);
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err_out:
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if (rc < 0) {
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snd_card_free(card);
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card = NULL;
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printk(TPACPI_ERR "Failed to register ALSA card: %d\n", rc);
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goto err_exit;
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}
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alsa_card = card;
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return rc;
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return 0;
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err_exit:
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snd_card_free(card);
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return 1;
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}
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#define TPACPI_VOL_Q_MUTEONLY 0x0001 /* Mute-only control available */
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@ -7016,6 +7023,28 @@ static struct ibm_struct volume_driver_data = {
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.shutdown = volume_shutdown,
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};
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#else /* !CONFIG_THINKPAD_ACPI_ALSA_SUPPORT */
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#define alsa_card NULL
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static void inline volume_alsa_notify_change(void)
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{
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}
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static int __init volume_init(struct ibm_init_struct *iibm)
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{
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printk(TPACPI_INFO
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"volume: disabled as there is no ALSA support in this kernel\n");
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return 1;
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}
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static struct ibm_struct volume_driver_data = {
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.name = "volume",
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};
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#endif /* CONFIG_THINKPAD_ACPI_ALSA_SUPPORT */
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/*************************************************************************
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* Fan subdriver
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*/
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@ -8738,6 +8767,7 @@ MODULE_PARM_DESC(hotkey_report_mode,
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"used for backwards compatibility with userspace, "
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"see documentation");
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#ifdef CONFIG_THINKPAD_ACPI_ALSA_SUPPORT
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module_param_named(volume_mode, volume_mode, uint, 0444);
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MODULE_PARM_DESC(volume_mode,
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"Selects volume control strategy: "
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@ -8760,6 +8790,7 @@ module_param_named(id, alsa_id, charp, 0444);
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MODULE_PARM_DESC(id, "ALSA id for the ACPI EC Mixer");
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module_param_named(enable, alsa_enable, bool, 0444);
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MODULE_PARM_DESC(enable, "Enable the ALSA interface for the ACPI EC Mixer");
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#endif /* CONFIG_THINKPAD_ACPI_ALSA_SUPPORT */
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#define TPACPI_PARAM(feature) \
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module_param_call(feature, set_ibm_param, NULL, NULL, 0); \
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