1 files changed, 130 insertions, 36 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 3bbc6eb60de..c3d11fabc46 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -972,7 +972,6 @@ static void tpacpi_shutdown_handler(struct platform_device *pdev)
 static struct platform_driver tpacpi_pdriver = {
 	.driver = {
 		.name = TPACPI_DRVR_NAME,
-		.owner = THIS_MODULE,
 		.pm = &tpacpi_pm,
 	},
 	.shutdown = tpacpi_shutdown_handler,
@@ -981,7 +980,6 @@ static struct platform_driver tpacpi_pdriver = {
 static struct platform_driver tpacpi_hwmon_pdriver = {
 	.driver = {
 		.name = TPACPI_HWMON_DRVR_NAME,
-		.owner = THIS_MODULE,
 	},
 };
 
@@ -3440,7 +3438,7 @@ err_exit:
 	delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
 	hotkey_dev_attributes = NULL;
 
-	return (res < 0)? res : 1;
+	return (res < 0) ? res : 1;
 }
 
 /* Thinkpad X1 Carbon support 5 modes including Home mode, Web browser
@@ -4576,7 +4574,7 @@ static int __init video_init(struct ibm_init_struct *iibm)
 		str_supported(video_supported != TPACPI_VIDEO_NONE),
 		video_supported);
 
-	return (video_supported != TPACPI_VIDEO_NONE)? 0 : 1;
+	return (video_supported != TPACPI_VIDEO_NONE) ? 0 : 1;
 }
 
 static void video_exit(void)
@@ -4669,7 +4667,7 @@ static int video_outputsw_set(int status)
 		return -ENOSYS;
 	}
 
-	return (res)? 0 : -EIO;
+	return (res) ? 0 : -EIO;
 }
 
 static int video_autosw_get(void)
@@ -4695,7 +4693,7 @@ static int video_autosw_get(void)
 
 static int video_autosw_set(int enable)
 {
-	if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", (enable)? 1 : 0))
+	if (!acpi_evalf(vid_handle, NULL, "_DOS", "vd", (enable) ? 1 : 0))
 		return -EIO;
 	return 0;
 }
@@ -4730,20 +4728,20 @@ static int video_outputsw_cycle(void)
 		return -EIO;
 	}
 
-	return (res)? 0 : -EIO;
+	return (res) ? 0 : -EIO;
 }
 
 static int video_expand_toggle(void)
 {
 	switch (video_supported) {
 	case TPACPI_VIDEO_570:
-		return acpi_evalf(ec_handle, NULL, "_Q17", "v")?
+		return acpi_evalf(ec_handle, NULL, "_Q17", "v") ?
 			0 : -EIO;
 	case TPACPI_VIDEO_770:
-		return acpi_evalf(vid_handle, NULL, "VEXP", "v")?
+		return acpi_evalf(vid_handle, NULL, "VEXP", "v") ?
 			0 : -EIO;
 	case TPACPI_VIDEO_NEW:
-		return acpi_evalf(NULL, NULL, "\\VEXP", "v")?
+		return acpi_evalf(NULL, NULL, "\\VEXP", "v") ?
 			0 : -EIO;
 	default:
 		return -ENOSYS;
@@ -4887,14 +4885,14 @@ static int light_set_status(int status)
 	if (tp_features.light) {
 		if (cmos_handle) {
 			rc = acpi_evalf(cmos_handle, NULL, NULL, "vd",
-					(status)?
+					(status) ?
 						TP_CMOS_THINKLIGHT_ON :
 						TP_CMOS_THINKLIGHT_OFF);
 		} else {
 			rc = acpi_evalf(lght_handle, NULL, NULL, "vd",
-					(status)? 1 : 0);
+					(status) ? 1 : 0);
 		}
-		return (rc)? 0 : -EIO;
+		return (rc) ? 0 : -EIO;
 	}
 
 	return -ENXIO;
@@ -4923,7 +4921,7 @@ static void light_sysfs_set(struct led_classdev *led_cdev,
 
 static enum led_brightness light_sysfs_get(struct led_classdev *led_cdev)
 {
-	return (light_get_status() == 1)? LED_FULL : LED_OFF;
+	return (light_get_status() == 1) ? LED_FULL : LED_OFF;
 }
 
 static struct tpacpi_led_classdev tpacpi_led_thinklight = {
@@ -5045,7 +5043,7 @@ static ssize_t cmos_command_store(struct device *dev,
 		return -EINVAL;
 
 	res = issue_thinkpad_cmos_command(cmos_cmd);
-	return (res)? res : count;
+	return (res) ? res : count;
 }
 
 static struct device_attribute dev_attr_cmos_command =
@@ -5069,7 +5067,7 @@ static int __init cmos_init(struct ibm_init_struct *iibm)
 	if (res)
 		return res;
 
-	return (cmos_handle)? 0 : 1;
+	return (cmos_handle) ? 0 : 1;
 }
 
 static void cmos_exit(void)
@@ -5179,9 +5177,9 @@ static int led_get_status(const unsigned int led)
 		if (!acpi_evalf(ec_handle,
 				&status, "GLED", "dd", 1 << led))
 			return -EIO;
-		led_s = (status == 0)?
+		led_s = (status == 0) ?
 				TPACPI_LED_OFF :
-				((status == 1)?
+				((status == 1) ?
 					TPACPI_LED_ON :
 					TPACPI_LED_BLINK);
 		tpacpi_led_state_cache[led] = led_s;
@@ -5578,7 +5576,7 @@ static int __init beep_init(struct ibm_init_struct *iibm)
 
 	tp_features.beep_needs_two_args = !!(quirks & TPACPI_BEEP_Q1);
 
-	return (beep_handle)? 0 : 1;
+	return (beep_handle) ? 0 : 1;
 }
 
 static int beep_read(struct seq_file *m)
@@ -6527,7 +6525,7 @@ static int brightness_write(char *buf)
 	if (!rc && ibm_backlight_device)
 		backlight_force_update(ibm_backlight_device,
 					BACKLIGHT_UPDATE_SYSFS);
-	return (rc == -EINTR)? -ERESTARTSYS : rc;
+	return (rc == -EINTR) ? -ERESTARTSYS : rc;
 }
 
 static struct ibm_struct brightness_driver_data = {
@@ -6559,6 +6557,17 @@ static struct ibm_struct brightness_driver_data = {
  * 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
@@ -6613,11 +6622,21 @@ enum tpacpi_volume_capabilities {
 	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
@@ -6635,6 +6654,8 @@ static void tpacpi_volume_checkpoint_nvram(void)
 		return;
 	if (!volume_control_allowed)
 		return;
+	if (software_mute_active)
+		return;
 
 	vdbg_printk(TPACPI_DBG_MIXER,
 		"trying to checkpoint mixer state to NVRAM...\n");
@@ -6696,6 +6717,12 @@ static int volume_set_status_ec(const u8 status)
 
 	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;
 }
 
@@ -6778,6 +6805,57 @@ unlock:
 	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,
@@ -6885,7 +6963,12 @@ static void volume_suspend(void)
 
 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)
@@ -6901,6 +6984,9 @@ static void volume_exit(void)
 	}
 
 	tpacpi_volume_checkpoint_nvram();
+
+	if (software_mute_active)
+		volume_exit_software_mute();
 }
 
 static int __init volume_create_alsa_mixer(void)
@@ -7085,16 +7171,20 @@ static int __init volume_init(struct ibm_init_struct *iibm)
 			"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");
@@ -7984,7 +8074,7 @@ static ssize_t fan_pwm1_store(struct device *dev,
 	}
 
 	mutex_unlock(&fan_mutex);
-	return (rc)? rc : count;
+	return (rc) ? rc : count;
 }
 
 static struct device_attribute dev_attr_fan_pwm1 =
@@ -8662,7 +8752,7 @@ static const char * __init str_supported(int is_supported)
 {
 	static char text_unsupported[] __initdata = "not supported";
 
-	return (is_supported)? &text_unsupported[4] : &text_unsupported[0];
+	return (is_supported) ? &text_unsupported[4] : &text_unsupported[0];
 }
 #endif /* CONFIG_THINKPAD_ACPI_DEBUG */
 
@@ -8783,7 +8873,7 @@ err_out:
 		ibm->name, ret);
 
 	ibm_exit(ibm);
-	return (ret < 0)? ret : 0;
+	return (ret < 0) ? ret : 0;
 }
 
 /* Probing */
@@ -8794,7 +8884,7 @@ static bool __pure __init tpacpi_is_fw_digit(const char c)
 }
 
 /* Most models: xxyTkkWW (#.##c); Ancient 570/600 and -SL lacks (#.##c) */
-static bool __pure __init tpacpi_is_valid_fw_id(const char* const s,
+static bool __pure __init tpacpi_is_valid_fw_id(const char * const s,
 						const char t)
 {
 	return s && strlen(s) >= 8 &&
@@ -8878,13 +8968,13 @@ static int __must_check __init get_thinkpad_model_data(
 	}
 
 	s = dmi_get_system_info(DMI_PRODUCT_VERSION);
-	if (s && !(strnicmp(s, "ThinkPad", 8) && strnicmp(s, "Lenovo", 6))) {
+	if (s && !(strncasecmp(s, "ThinkPad", 8) && strncasecmp(s, "Lenovo", 6))) {
 		tp->model_str = kstrdup(s, GFP_KERNEL);
 		if (!tp->model_str)
 			return -ENOMEM;
 	} else {
 		s = dmi_get_system_info(DMI_BIOS_VENDOR);
-		if (s && !(strnicmp(s, "Lenovo", 6))) {
+		if (s && !(strncasecmp(s, "Lenovo", 6))) {
 			tp->model_str = kstrdup(s, GFP_KERNEL);
 			if (!tp->model_str)
 				return -ENOMEM;
@@ -9091,6 +9181,10 @@ MODULE_PARM_DESC(volume_control,
 		 "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");