* bits 3-0 (volume). Other bits in NVRAM may have other functions,
* such as bit 7 which is used to detect repeated presses of MUTE,
* and we leave them unchanged.
+ *
+ * On newer Lenovo ThinkPads, the EC can automatically change the volume
+ * in response to user input. Unfortunately, this rarely works well.
+ * The laptop changes the state of its internal MUTE gate and, on some
+ * models, sends KEY_MUTE, causing any user code that responds to the
+ * mute button to get confused. The hardware MUTE gate is also
+ * unnecessary, since user code can handle the mute button without
+ * kernel or EC help.
+ *
+ * To avoid confusing userspace, we simply disable all EC-based mute
+ * and volume controls when possible.
*/
#ifdef CONFIG_THINKPAD_ACPI_ALSA_SUPPORT
TPACPI_VOL_CAP_MAX
};
+enum tpacpi_mute_btn_mode {
+ TP_EC_MUTE_BTN_LATCH = 0, /* Mute mutes; up/down unmutes */
+ /* We don't know what mode 1 is. */
+ TP_EC_MUTE_BTN_NONE = 2, /* Mute and up/down are just keys */
+ TP_EC_MUTE_BTN_TOGGLE = 3, /* Mute toggles; up/down unmutes */
+};
+
static enum tpacpi_volume_access_mode volume_mode =
TPACPI_VOL_MODE_MAX;
static enum tpacpi_volume_capabilities volume_capabilities;
static bool volume_control_allowed;
+static bool software_mute_requested = true;
+static bool software_mute_active;
+static int software_mute_orig_mode;
/*
* Used to syncronize writers to TP_EC_AUDIO and
return;
if (!volume_control_allowed)
return;
+ if (software_mute_active)
+ return;
vdbg_printk(TPACPI_DBG_MIXER,
"trying to checkpoint mixer state to NVRAM...\n");
dbg_printk(TPACPI_DBG_MIXER, "set EC mixer to 0x%02x\n", status);
+ /*
+ * On X200s, and possibly on others, it can take a while for
+ * reads to become correct.
+ */
+ msleep(1);
+
return 0;
}
return rc;
}
+static int volume_set_software_mute(bool startup)
+{
+ int result;
+
+ if (!tpacpi_is_lenovo())
+ return -ENODEV;
+
+ if (startup) {
+ if (!acpi_evalf(ec_handle, &software_mute_orig_mode,
+ "HAUM", "qd"))
+ return -EIO;
+
+ dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_MIXER,
+ "Initial HAUM setting was %d\n",
+ software_mute_orig_mode);
+ }
+
+ if (!acpi_evalf(ec_handle, &result, "SAUM", "qdd",
+ (int)TP_EC_MUTE_BTN_NONE))
+ return -EIO;
+
+ if (result != TP_EC_MUTE_BTN_NONE)
+ pr_warn("Unexpected SAUM result %d\n",
+ result);
+
+ /*
+ * In software mute mode, the standard codec controls take
+ * precendence, so we unmute the ThinkPad HW switch at
+ * startup. Just on case there are SAUM-capable ThinkPads
+ * with level controls, set max HW volume as well.
+ */
+ if (tp_features.mixer_no_level_control)
+ result = volume_set_mute(false);
+ else
+ result = volume_set_status(TP_EC_VOLUME_MAX);
+
+ if (result != 0)
+ pr_warn("Failed to unmute the HW mute switch\n");
+
+ return 0;
+}
+
+static void volume_exit_software_mute(void)
+{
+ int r;
+
+ if (!acpi_evalf(ec_handle, &r, "SAUM", "qdd", software_mute_orig_mode)
+ || r != software_mute_orig_mode)
+ pr_warn("Failed to restore mute mode\n");
+}
+
static int volume_alsa_set_volume(const u8 vol)
{
dbg_printk(TPACPI_DBG_MIXER,
static void volume_resume(void)
{
- volume_alsa_notify_change();
+ if (software_mute_active) {
+ if (volume_set_software_mute(false) < 0)
+ pr_warn("Failed to restore software mute\n");
+ } else {
+ volume_alsa_notify_change();
+ }
}
static void volume_shutdown(void)
}
tpacpi_volume_checkpoint_nvram();
+
+ if (software_mute_active)
+ volume_exit_software_mute();
}
static int __init volume_create_alsa_mixer(void)
"mute is supported, volume control is %s\n",
str_supported(!tp_features.mixer_no_level_control));
- rc = volume_create_alsa_mixer();
- if (rc) {
- pr_err("Could not create the ALSA mixer interface\n");
- return rc;
- }
+ if (software_mute_requested && volume_set_software_mute(true) == 0) {
+ software_mute_active = true;
+ } else {
+ rc = volume_create_alsa_mixer();
+ if (rc) {
+ pr_err("Could not create the ALSA mixer interface\n");
+ return rc;
+ }
- pr_info("Console audio control enabled, mode: %s\n",
- (volume_control_allowed) ?
- "override (read/write)" :
- "monitor (read only)");
+ pr_info("Console audio control enabled, mode: %s\n",
+ (volume_control_allowed) ?
+ "override (read/write)" :
+ "monitor (read only)");
+ }
vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_MIXER,
"registering volume hotkeys as change notification\n");
"Enables software override for the console audio "
"control when true");
+module_param_named(software_mute, software_mute_requested, bool, 0444);
+MODULE_PARM_DESC(software_mute,
+ "Request full software mute control");
+
/* ALSA module API parameters */
module_param_named(index, alsa_index, int, 0444);
MODULE_PARM_DESC(index, "ALSA index for the ACPI EC Mixer");
projects / deliverable / linux.git / blobdiff