[PATCH v2 0/3] Huawei laptops WMI & sound fixes

[PATCH v2 0/3] Huawei laptops WMI & sound fixes

[Ayman Bagabas]

This patch set fixes some of the issues with Huawei laptops. 

[PATCH v2 1/3] 
The first patch adds support for missing hotkeys on some models. Some hotkeys,
like brightness keys, work out of the box on these models.

[PATCH v2 2/3]
This one enables the front speakers on the Huawei Matebook X Pro (MBXP). This
solves bug 200501 https://bugzilla.kernel.org/show_bug.cgi?id=200501
It simply uses the pins configurations generated by hdajackretast using the
settings posted on the bug page https://imgur.com/a/N1xsCVZ

[PATCH v2 3/3]
This enables the micmute LED on Huawei laptops. It calls an WMI method, using
PATCH #1, to turn the micmute LED on/off.

Ayman Bagabas (3):
  x86: add support for Huawei WMI hotkeys.
  ALSA: hda: fix front speakers on Huawei MBXP.
  ALSA: hda: add support for Huawei WMI MicMute LED

 drivers/platform/x86/Kconfig      |  13 ++
 drivers/platform/x86/Makefile     |   1 +
 drivers/platform/x86/huawei_wmi.c | 224 ++++++++++++++++++++++++++++++
 include/linux/huawei_wmi.h        |   7 +
 sound/pci/hda/huawei_wmi_helper.c |  48 +++++++
 sound/pci/hda/patch_realtek.c     |  28 ++++
 6 files changed, 321 insertions(+)
 create mode 100644 drivers/platform/x86/huawei_wmi.c
 create mode 100644 include/linux/huawei_wmi.h
 create mode 100644 sound/pci/hda/huawei_wmi_helper.c

-- 
2.17.2

[PATCH v2 1/3] x86: add support for Huawei WMI hotkeys.

[Ayman Bagabas]

This driver adds support for missing hotkeys on some Huawei laptops.
Currently, only Huawei Matebook X Pro is supported. The driver
recognizes the following keys: brightness keys, micmute, wlan, and
Huawei special key. The brightness keys are ignored since they work out
of the box.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
---
 drivers/platform/x86/Kconfig      |  13 ++
 drivers/platform/x86/Makefile     |   1 +
 drivers/platform/x86/huawei_wmi.c | 223 ++++++++++++++++++++++++++++++
 3 files changed, 237 insertions(+)
 create mode 100644 drivers/platform/x86/huawei_wmi.c

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0c1aa6c314f5..c6813981e45c 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1229,6 +1229,19 @@ config I2C_MULTI_INSTANTIATE
 	  To compile this driver as a module, choose M here: the module
 	  will be called i2c-multi-instantiate.
 
+config HUAWEI_LAPTOP
+	tristate "Huawei WMI hotkeys driver"
+	depends on ACPI
+	depends on ACPI_WMI
+	depends on INPUT
+	select INPUT_SPARSEKMAP
+	help
+	  This driver provides support for Huawei WMI hotkeys.
+	  It enables the missing keys and adds support to micmute
+	  led found on these laptops.q
+	  Supported devices are:
+	  - Matebook X Pro
+
 endif # X86_PLATFORM_DEVICES
 
 config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e6d1becf81ce..5984354e18ff 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_ACERHDF)		+= acerhdf.o
 obj-$(CONFIG_HP_ACCEL)		+= hp_accel.o
 obj-$(CONFIG_HP_WIRELESS)	+= hp-wireless.o
 obj-$(CONFIG_HP_WMI)		+= hp-wmi.o
+obj-$(CONFIG_HUAWEI_LAPTOP)		+= huawei_wmi.o
 obj-$(CONFIG_AMILO_RFKILL)	+= amilo-rfkill.o
 obj-$(CONFIG_GPD_POCKET_FAN)	+= gpd-pocket-fan.o
 obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
diff --git a/drivers/platform/x86/huawei_wmi.c b/drivers/platform/x86/huawei_wmi.c
new file mode 100644
index 000000000000..83545217ac19
--- /dev/null
+++ b/drivers/platform/x86/huawei_wmi.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Huawei WMI Hotkeys Driver
+ *
+ *  Copyright (C) 2018		  Ayman Bagabas <ayman.bagabas@gmail.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
+#include <linux/acpi.h>
+#include <linux/wmi.h>
+
+MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
+MODULE_DESCRIPTION("Huawei WMI hotkeys");
+MODULE_LICENSE("GPL");
+
+#define DEVICE_NAME "huawei"
+#define MODULE_NAME DEVICE_NAME"_wmi"
+
+/*
+ * Huawei WMI Devices GUIDs
+ */
+#define AMW0_GUID "ABBC0F5B-8EA1-11D1-A000-C90629100000" // \_SB.AMW0
+
+/*
+ * Huawei WMI Events GUIDs
+ */
+#define EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"
+
+MODULE_ALIAS("wmi:"AMW0_GUID);
+MODULE_ALIAS("wmi:"EVENT_GUID);
+
+enum {
+	MICMUTE_LED_ON = 0x00010B04,
+	MICMUTE_LED_OFF = 0x00000B04,
+};
+
+static const struct key_entry huawei_wmi_keymap[] __initconst = {
+		{ KE_IGNORE, 0x281, { KEY_BRIGHTNESSDOWN } },
+		{ KE_IGNORE, 0x282, { KEY_BRIGHTNESSUP } },
+		{ KE_KEY,	0x287, { KEY_MICMUTE } },
+		{ KE_KEY,	0x289, { KEY_WLAN } },
+		// Huawei |M| button
+		{ KE_KEY,	0x28a, { KEY_PROG1 } },
+		{ KE_END,	0 }
+};
+
+struct huawei_wmi_device {
+	struct input_dev *inputdev;
+};
+static struct huawei_wmi_device *wmi_device;
+
+int huawei_wmi_micmute_led_set(bool on)
+{
+	u32 args = (on) ? MICMUTE_LED_ON : MICMUTE_LED_OFF;
+	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+	acpi_status status;
+
+	status = wmi_evaluate_method(AMW0_GUID, 0, 1, &input, NULL);
+	if (ACPI_FAILURE(status))
+		return status;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(huawei_wmi_micmute_led_set);
+
+static void huawei_wmi_process_key(struct input_dev *input_dev, int code)
+{
+	const struct key_entry *key;
+
+	key = sparse_keymap_entry_from_scancode(input_dev, code);
+
+	if (!key) {
+		pr_info("%s: Unknown key pressed, code: 0x%04x\n",
+					MODULE_NAME, code);
+		return;
+	}
+
+	sparse_keymap_report_entry(input_dev, key, 1, true);
+}
+
+static void huawei_wmi_notify(u32 value, void *context)
+{
+	struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+
+	status = wmi_get_event_data(value, &response);
+	if (ACPI_FAILURE(status)) {
+		pr_err("%s: Bad event status 0x%x\n",
+					MODULE_NAME, status);
+		return;
+	}
+
+	obj = (union acpi_object *)response.pointer;
+
+	if (!obj)
+		return;
+
+	if (obj->type == ACPI_TYPE_INTEGER)
+		huawei_wmi_process_key(wmi_device->inputdev,
+							obj->integer.value);
+	else
+		pr_info("%s: Unknown response received %d\n",
+					MODULE_NAME, obj->type);
+
+	kfree(response.pointer);
+}
+
+static int huawei_input_init(void)
+{
+	acpi_status status;
+	int err;
+
+	wmi_device->inputdev = input_allocate_device();
+	if (!wmi_device->inputdev)
+		return -ENOMEM;
+
+	wmi_device->inputdev->name = "Huawei WMI hotkeys";
+	wmi_device->inputdev->phys = "wmi/input0";
+	wmi_device->inputdev->id.bustype = BUS_HOST;
+
+	err = sparse_keymap_setup(wmi_device->inputdev,
+			huawei_wmi_keymap, NULL);
+	if (err)
+		goto err_free_dev;
+
+	status = wmi_install_notify_handler(EVENT_GUID,
+			huawei_wmi_notify,
+			NULL);
+
+	if (ACPI_FAILURE(status)) {
+		err = -EIO;
+		goto err_free_dev;
+	}
+
+	err = input_register_device(wmi_device->inputdev);
+	if (err)
+		goto err_remove_notifier;
+
+	return 0;
+
+
+err_remove_notifier:
+	wmi_remove_notify_handler(EVENT_GUID);
+err_free_dev:
+	input_free_device(wmi_device->inputdev);
+	return err;
+}
+
+static void huawei_input_exit(void)
+{
+	wmi_remove_notify_handler(EVENT_GUID);
+	input_unregister_device(wmi_device->inputdev);
+}
+
+static int __init huawei_wmi_setup(void)
+{
+	int err;
+
+	wmi_device = kmalloc(sizeof(struct huawei_wmi_device), GFP_KERNEL);
+	if (!wmi_device)
+		return -ENOMEM;
+
+	err = huawei_input_init();
+	if (err)
+		goto err_input;
+
+	return 0;
+
+err_input:
+	return err;
+}
+
+static void huawei_wmi_destroy(void)
+{
+	huawei_input_exit();
+	kfree(wmi_device);
+}
+
+static int __init huawei_wmi_init(void)
+{
+	int err;
+
+	if (!wmi_has_guid(EVENT_GUID)) {
+		pr_warn("%s: No known WMI GUID found\n", MODULE_NAME);
+		return -ENODEV;
+	}
+
+	err = huawei_wmi_setup();
+	if (err) {
+		pr_err("%s: Failed to setup device\n", MODULE_NAME);
+		return err;
+	}
+
+	return 0;
+}
+
+static void __exit huawei_wmi_exit(void)
+{
+	huawei_wmi_destroy();
+	pr_debug("%s: Driver unloaded successfully\n", MODULE_NAME);
+}
+
+module_init(huawei_wmi_init);
+module_exit(huawei_wmi_exit);
-- 
2.17.2

[PATCH v2 2/3] ALSA: hda: fix front speakers on Huawei MBXP.

[Ayman Bagabas]

This patch solves bug 200501 'Only 2 of 4 speakers playing sound.'
https://bugzilla.kernel.org/show_bug.cgi?id=200501
It enables the front speakers on Huawei Matebook X Pro laptops.
These laptops come with Dolby Atmos sound system and these pins
configuration enables the front speakers.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
---
 sound/pci/hda/patch_realtek.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 3ac7ba9b342d..4f7a39c7883c 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -5493,6 +5493,7 @@ enum {
 	ALC298_FIXUP_TPT470_DOCK,
 	ALC255_FIXUP_DUMMY_LINEOUT_VERB,
 	ALC255_FIXUP_DELL_HEADSET_MIC,
+	ALC256_FIXUP_HUAWEI_MBXP_PINS,
 	ALC295_FIXUP_HP_X360,
 	ALC221_FIXUP_HP_HEADSET_MIC,
 };
@@ -6347,6 +6348,22 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC269_FIXUP_HEADSET_MIC
 	},
+	[ALC256_FIXUP_HUAWEI_MBXP_PINS] = {
+		.type = HDA_FIXUP_PINS,
+		.v.pins = (const struct hda_pintbl[]) {
+			{0x12, 0x90a60130},
+			{0x13, 0x40000000},
+			{0x14, 0x90170110},
+			{0x18, 0x411111f0},
+			{0x19, 0x04a11040},
+			{0x1a, 0x411111f0},
+			{0x1b, 0x90170112},
+			{0x1d, 0x40759a05},
+			{0x1e, 0x411111f0},
+			{0x21, 0x04211020},
+			{ },
+		},
+	},
 	[ALC295_FIXUP_HP_X360] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc295_fixup_hp_top_speakers,
@@ -6592,6 +6609,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x17aa, 0x5109, "Thinkpad", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
 	SND_PCI_QUIRK(0x17aa, 0x511e, "Thinkpad", ALC298_FIXUP_TPT470_DOCK),
 	SND_PCI_QUIRK(0x17aa, 0x511f, "Thinkpad", ALC298_FIXUP_TPT470_DOCK),
+	SND_PCI_QUIRK(0x19e5, 0x3204, "Huawei MBXP", ALC256_FIXUP_HUAWEI_MBXP_PINS),
 	SND_PCI_QUIRK(0x17aa, 0x3bf8, "Quanta FL1", ALC269_FIXUP_PCM_44K),
 	SND_PCI_QUIRK(0x17aa, 0x9e54, "LENOVO NB", ALC269_FIXUP_LENOVO_EAPD),
 	SND_PCI_QUIRK(0x1b7d, 0xa831, "Ordissimo EVE2 ", ALC269VB_FIXUP_ORDISSIMO_EVE2), /* Also known as Malata PC-B1303 */
-- 
2.17.2

[PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[Ayman Bagabas]

Some of Huawei laptops come with a LED in the mic mute key. This patch
enables and disable this LED accordingly.

Signed-off-by: Ayman Bagabas <ayman.bagabas@gmail.com>
---
 drivers/platform/x86/huawei_wmi.c |  1 +
 include/linux/huawei_wmi.h        |  7 +++++
 sound/pci/hda/huawei_wmi_helper.c | 48 +++++++++++++++++++++++++++++++
 sound/pci/hda/patch_realtek.c     | 10 +++++++
 4 files changed, 66 insertions(+)
 create mode 100644 include/linux/huawei_wmi.h
 create mode 100644 sound/pci/hda/huawei_wmi_helper.c

diff --git a/drivers/platform/x86/huawei_wmi.c b/drivers/platform/x86/huawei_wmi.c
index 83545217ac19..cc5492571727 100644
--- a/drivers/platform/x86/huawei_wmi.c
+++ b/drivers/platform/x86/huawei_wmi.c
@@ -26,6 +26,7 @@
 #include <linux/input/sparse-keymap.h>
 #include <linux/acpi.h>
 #include <linux/wmi.h>
+#include <linux/huawei_wmi.h>
 
 MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
 MODULE_DESCRIPTION("Huawei WMI hotkeys");
diff --git a/include/linux/huawei_wmi.h b/include/linux/huawei_wmi.h
new file mode 100644
index 000000000000..69b656c5029b
--- /dev/null
+++ b/include/linux/huawei_wmi.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __HUAWEI_WMI_H__
+#define __HUAWEI_WMI_H__
+
+int huawei_wmi_micmute_led_set(bool on);
+
+#endif
diff --git a/sound/pci/hda/huawei_wmi_helper.c b/sound/pci/hda/huawei_wmi_helper.c
new file mode 100644
index 000000000000..77edb658cbf0
--- /dev/null
+++ b/sound/pci/hda/huawei_wmi_helper.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Helper functions for Huawei WMI Mic Mute LED;
+ * to be included from codec driver
+ */
+
+#if IS_ENABLED(CONFIG_HUAWEI_LAPTOP)
+#include <linux/huawei_wmi.h>
+
+static int (*huawei_wmi_micmute_led_set_func)(bool);
+
+static void update_huawei_wmi_micmute_led(struct hda_codec *codec)
+{
+	struct hda_gen_spec *spec = codec->spec;
+
+	huawei_wmi_micmute_led_set_func(spec->micmute_led.led_value);
+}
+
+static void alc_fixup_huawei_wmi(struct hda_codec *codec,
+				   const struct hda_fixup *fix, int action)
+{
+	bool removefunc = false;
+
+	if (action == HDA_FIXUP_ACT_PROBE) {
+		if (!huawei_wmi_micmute_led_set_func)
+			huawei_wmi_micmute_led_set_func = symbol_request(huawei_wmi_micmute_led_set);
+		if (!huawei_wmi_micmute_led_set_func) {
+			codec_warn(codec, "Failed to find huawei_wmi symbol huawei_wmi_micmute_led_set\n");
+			return;
+		}
+		removefunc = (huawei_wmi_micmute_led_set_func(false) < 0)
+			|| (snd_hda_gen_add_micmute_led(codec, update_huawei_wmi_micmute_led) < 0);
+
+	}
+
+	if (huawei_wmi_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
+		symbol_put(huawei_wmi_micmute_led_set);
+		huawei_wmi_micmute_led_set_func = NULL;
+	}
+}
+
+#else
+
+static void alc_fixup_huawei_wmi(struct hda_codec *codec,
+				const struct hda_fixup *fix, int action)
+{
+}
+
+#endif
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 4f7a39c7883c..d09457d2a4f3 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -5374,6 +5374,9 @@ static void alc_fixup_thinkpad_acpi(struct hda_codec *codec,
 /* for alc295_fixup_hp_top_speakers */
 #include "hp_x360_helper.c"
 
+/* for alc_fixup_huawei_micmute_led */
+#include "huawei_wmi_helper.c"
+
 enum {
 	ALC269_FIXUP_SONY_VAIO,
 	ALC275_FIXUP_SONY_VAIO_GPIO2,
@@ -5494,6 +5497,7 @@ enum {
 	ALC255_FIXUP_DUMMY_LINEOUT_VERB,
 	ALC255_FIXUP_DELL_HEADSET_MIC,
 	ALC256_FIXUP_HUAWEI_MBXP_PINS,
+	ALC256_FIXUP_HUAWEI_WMI_MICMUTE_LED,
 	ALC295_FIXUP_HP_X360,
 	ALC221_FIXUP_HP_HEADSET_MIC,
 };
@@ -6348,6 +6352,10 @@ static const struct hda_fixup alc269_fixups[] = {
 		.chained = true,
 		.chain_id = ALC269_FIXUP_HEADSET_MIC
 	},
+	[ALC256_FIXUP_HUAWEI_WMI_MICMUTE_LED] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc_fixup_huawei_wmi
+	},
 	[ALC256_FIXUP_HUAWEI_MBXP_PINS] = {
 		.type = HDA_FIXUP_PINS,
 		.v.pins = (const struct hda_pintbl[]) {
@@ -6363,6 +6371,8 @@ static const struct hda_fixup alc269_fixups[] = {
 			{0x21, 0x04211020},
 			{ },
 		},
+		.chained = true,
+		.chain_id = ALC256_FIXUP_HUAWEI_WMI_MICMUTE_LED
 	},
 	[ALC295_FIXUP_HP_X360] = {
 		.type = HDA_FIXUP_FUNC,
-- 
2.17.2

Re: [PATCH v2 0/3] Huawei laptops WMI & sound fixes

[Andy Shevchenko]

On Fri, Nov 2, 2018 at 6:11 AM Ayman Bagabas <ayman.bagabas@gmail.com> wrote:
>
> This patch set fixes some of the issues with Huawei laptops.
>

Thanks for the series, I'll review it later on.

> [PATCH v2 1/3]
> The first patch adds support for missing hotkeys on some models. Some hotkeys,
> like brightness keys, work out of the box on these models.
>
> [PATCH v2 2/3]
> This one enables the front speakers on the Huawei Matebook X Pro (MBXP). This
> solves bug 200501 https://bugzilla.kernel.org/show_bug.cgi?id=200501
> It simply uses the pins configurations generated by hdajackretast using the
> settings posted on the bug page https://imgur.com/a/N1xsCVZ
>
> [PATCH v2 3/3]
> This enables the micmute LED on Huawei laptops. It calls an WMI method, using
> PATCH #1, to turn the micmute LED on/off.
>
> Ayman Bagabas (3):
>   x86: add support for Huawei WMI hotkeys.
>   ALSA: hda: fix front speakers on Huawei MBXP.
>   ALSA: hda: add support for Huawei WMI MicMute LED
>
>  drivers/platform/x86/Kconfig      |  13 ++
>  drivers/platform/x86/Makefile     |   1 +
>  drivers/platform/x86/huawei_wmi.c | 224 ++++++++++++++++++++++++++++++
>  include/linux/huawei_wmi.h        |   7 +
>  sound/pci/hda/huawei_wmi_helper.c |  48 +++++++
>  sound/pci/hda/patch_realtek.c     |  28 ++++
>  6 files changed, 321 insertions(+)
>  create mode 100644 drivers/platform/x86/huawei_wmi.c
>  create mode 100644 include/linux/huawei_wmi.h
>  create mode 100644 sound/pci/hda/huawei_wmi_helper.c
>
> --
> 2.17.2
>


-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 2/3] ALSA: hda: fix front speakers on Huawei MBXP.

[Andy Shevchenko]

On Fri, Nov 2, 2018 at 6:11 AM Ayman Bagabas <ayman.bagabas@gmail.com> wrote:
>
> This patch solves bug 200501 'Only 2 of 4 speakers playing sound.'
> https://bugzilla.kernel.org/show_bug.cgi?id=200501
> It enables the front speakers on Huawei Matebook X Pro laptops.
> These laptops come with Dolby Atmos sound system and these pins
> configuration enables the front speakers.

> +       [ALC256_FIXUP_HUAWEI_MBXP_PINS] = {
> +               .type = HDA_FIXUP_PINS,
> +               .v.pins = (const struct hda_pintbl[]) {
> +                       {0x12, 0x90a60130},
> +                       {0x13, 0x40000000},
> +                       {0x14, 0x90170110},
> +                       {0x18, 0x411111f0},
> +                       {0x19, 0x04a11040},
> +                       {0x1a, 0x411111f0},
> +                       {0x1b, 0x90170112},
> +                       {0x1d, 0x40759a05},
> +                       {0x1e, 0x411111f0},
> +                       {0x21, 0x04211020},


> +                       { },

Terminators better w/o comma.

> +               },
> +       },

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[Andy Shevchenko]

On Fri, Nov 2, 2018 at 6:12 AM Ayman Bagabas <ayman.bagabas@gmail.com> wrote:
>
> Some of Huawei laptops come with a LED in the mic mute key. This patch
> enables and disable this LED accordingly.

> --- a/drivers/platform/x86/huawei_wmi.c
> +++ b/drivers/platform/x86/huawei_wmi.c
> @@ -26,6 +26,7 @@
>  #include <linux/input/sparse-keymap.h>
>  #include <linux/acpi.h>
>  #include <linux/wmi.h>
> +#include <linux/huawei_wmi.h>

Keep it in order and put under
include/linux/platform_data/x86/
folder.

> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __HUAWEI_WMI_H__
> +#define __HUAWEI_WMI_H__
> +
> +int huawei_wmi_micmute_led_set(bool on);
> +
> +#endif

This has to cover !HUAWEI_LAPTOP case.

> +/* Helper functions for Huawei WMI Mic Mute LED;
> + * to be included from codec driver
> + */

Comment style.

> +#if IS_ENABLED(CONFIG_HUAWEI_LAPTOP)

See above

> +static int (*huawei_wmi_micmute_led_set_func)(bool);

Why is that?

> +       if (action == HDA_FIXUP_ACT_PROBE) {
> +               if (!huawei_wmi_micmute_led_set_func)
> +                       huawei_wmi_micmute_led_set_func = symbol_request(huawei_wmi_micmute_led_set);
> +               if (!huawei_wmi_micmute_led_set_func) {
> +                       codec_warn(codec, "Failed to find huawei_wmi symbol huawei_wmi_micmute_led_set\n");
> +                       return;
> +               }
> +               removefunc = (huawei_wmi_micmute_led_set_func(false) < 0)
> +                       || (snd_hda_gen_add_micmute_led(codec, update_huawei_wmi_micmute_led) < 0);
> +
> +       }
> +
> +       if (huawei_wmi_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
> +               symbol_put(huawei_wmi_micmute_led_set);
> +               huawei_wmi_micmute_led_set_func = NULL;
> +       }
> +}

Takashi, is it a way how the rest sound drivers are written? B/c this
symbol_request(s) look to me a bit ugly.

> +/* for alc_fixup_huawei_micmute_led */
> +#include "huawei_wmi_helper.c"

Ditto.

Include *.c?! Huh?

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 1/3] x86: add support for Huawei WMI hotkeys.

[Andy Shevchenko]

On Fri, Nov 2, 2018 at 6:11 AM Ayman Bagabas <ayman.bagabas@gmail.com> wrote:
>
> This driver adds support for missing hotkeys on some Huawei laptops.
> Currently, only Huawei Matebook X Pro is supported. The driver
> recognizes the following keys: brightness keys, micmute, wlan, and
> Huawei special key. The brightness keys are ignored since they work out
> of the box.

> +config HUAWEI_LAPTOP
> +       tristate "Huawei WMI hotkeys driver"
> +       depends on ACPI

> +       depends on ACPI_WMI


> +       depends on INPUT
> +       select INPUT_SPARSEKMAP
> +       help
> +         This driver provides support for Huawei WMI hotkeys.
> +         It enables the missing keys and adds support to micmute
> +         led found on these laptops.q
> +         Supported devices are:
> +         - Matebook X Pro


> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + *  Huawei WMI Hotkeys Driver
> + *
> + *  Copyright (C) 2018           Ayman Bagabas <ayman.bagabas@gmail.com>
> + *
> + *  This program is free software: you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation, either version 2 of the License, or
> + *  (at your option) any later version.
> + *
> + *  This program is distributed in the hope that it will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License
> + *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
> + *
> + */

> +MODULE_LICENSE("GPL");


Here you have the following issues:
- inconsistency between IDs for license (fix accordingly)
- SDPX _and_ License header (remove latter)


> +#include <linux/kernel.h>

> +#include <linux/module.h>
> +#include <linux/init.h>

Choose one of them.

> +#include <linux/input.h>
> +#include <linux/input/sparse-keymap.h>
> +#include <linux/acpi.h>
> +#include <linux/wmi.h>

Please, keep in order.

> +static const struct key_entry huawei_wmi_keymap[] __initconst = {
> +               { KE_IGNORE, 0x281, { KEY_BRIGHTNESSDOWN } },
> +               { KE_IGNORE, 0x282, { KEY_BRIGHTNESSUP } },
> +               { KE_KEY,       0x287, { KEY_MICMUTE } },
> +               { KE_KEY,       0x289, { KEY_WLAN } },
> +               // Huawei |M| button
> +               { KE_KEY,       0x28a, { KEY_PROG1 } },
> +               { KE_END,       0 }
> +};
> +

> +struct huawei_wmi_device {
> +       struct input_dev *inputdev;
> +};

Apparently no need to have this, you may use struct input_dev
directly, isn't it?

> +static struct huawei_wmi_device *wmi_device;

No global variables, please.

> +int huawei_wmi_micmute_led_set(bool on)
> +{
> +       u32 args = (on) ? MICMUTE_LED_ON : MICMUTE_LED_OFF;

Redundant parens.

> +       struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
> +       acpi_status status;
> +
> +       status = wmi_evaluate_method(AMW0_GUID, 0, 1, &input, NULL);
> +       if (ACPI_FAILURE(status))
> +               return status;
> +
> +       return 0;
> +}

> +static void huawei_wmi_process_key(struct input_dev *input_dev, int code)
> +{
> +       const struct key_entry *key;
> +

> +       key = sparse_keymap_entry_from_scancode(input_dev, code);
> +

This blank line is redundant.

> +       if (!key) {
> +               pr_info("%s: Unknown key pressed, code: 0x%04x\n",
> +                                       MODULE_NAME, code);

dev_info(); no MODULE_NAME, please.

> +               return;
> +       }
> +
> +       sparse_keymap_report_entry(input_dev, key, 1, true);
> +}

> +static void huawei_wmi_notify(u32 value, void *context)
> +{
> +       struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
> +       union acpi_object *obj;
> +       acpi_status status;
> +
> +       status = wmi_get_event_data(value, &response);
> +       if (ACPI_FAILURE(status)) {

> +               pr_err("%s: Bad event status 0x%x\n",
> +                                       MODULE_NAME, status);

No MODULE_NAME, please.
If needed, use pr_fmt() macro.

But I'm pretty sure you may pass pointer to input device and use dev_err().

> +               return;
> +       }
> +

> +       obj = (union acpi_object *)response.pointer;
> +

No redundant blank lines, please.

> +       if (!obj)
> +               return;
> +
> +       if (obj->type == ACPI_TYPE_INTEGER)
> +               huawei_wmi_process_key(wmi_device->inputdev,
> +                                                       obj->integer.value);
> +       else

> +               pr_info("%s: Unknown response received %d\n",
> +                                       MODULE_NAME, obj->type);

Ditto about module name.

> +
> +       kfree(response.pointer);
> +}
> +
> +static int huawei_input_init(void)
> +{
> +       acpi_status status;
> +       int err;

> +       status = wmi_install_notify_handler(EVENT_GUID,
> +                       huawei_wmi_notify,

> +                       NULL);

Pointer to the input device instead of NULL.

> +

No redundant blank lines, please.

> +       if (ACPI_FAILURE(status)) {
> +               err = -EIO;
> +               goto err_free_dev;
> +       }

> +}


> +       wmi_device = kmalloc(sizeof(struct huawei_wmi_device), GFP_KERNEL);

sizeof(*wmi_device)

> +       if (!wmi_device)
> +               return -ENOMEM;

> +}


> +       pr_debug("%s: Driver unloaded successfully\n", MODULE_NAME);

Noise.

--
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[Takashi Iwai]

On Fri, 02 Nov 2018 19:12:44 +0100,
Andy Shevchenko wrote:
> 
> > +       if (action == HDA_FIXUP_ACT_PROBE) {
> > +               if (!huawei_wmi_micmute_led_set_func)
> > +                       huawei_wmi_micmute_led_set_func = symbol_request(huawei_wmi_micmute_led_set);
> > +               if (!huawei_wmi_micmute_led_set_func) {
> > +                       codec_warn(codec, "Failed to find huawei_wmi symbol huawei_wmi_micmute_led_set\n");
> > +                       return;
> > +               }
> > +               removefunc = (huawei_wmi_micmute_led_set_func(false) < 0)
> > +                       || (snd_hda_gen_add_micmute_led(codec, update_huawei_wmi_micmute_led) < 0);
> > +
> > +       }
> > +
> > +       if (huawei_wmi_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
> > +               symbol_put(huawei_wmi_micmute_led_set);
> > +               huawei_wmi_micmute_led_set_func = NULL;
> > +       }
> > +}
> 
> Takashi, is it a way how the rest sound drivers are written? B/c this
> symbol_request(s) look to me a bit ugly.

It's a workaround for not having a hard dependency.  The HD-audio
codec driver is generic, and we don't want to load the multiple WMI
drivers always for using a Realtek codec.

Ugly, yes, but simple enough.


thanks,

Takashi

Re: [PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[Takashi Iwai]

On Fri, 02 Nov 2018 19:12:44 +0100,
Andy Shevchenko wrote:
> 
> > +       if (action == HDA_FIXUP_ACT_PROBE) {
> > +               if (!huawei_wmi_micmute_led_set_func)
> > +                       huawei_wmi_micmute_led_set_func = symbol_request(huawei_wmi_micmute_led_set);
> > +               if (!huawei_wmi_micmute_led_set_func) {
> > +                       codec_warn(codec, "Failed to find huawei_wmi symbol huawei_wmi_micmute_led_set\n");
> > +                       return;
> > +               }
> > +               removefunc = (huawei_wmi_micmute_led_set_func(false) < 0)
> > +                       || (snd_hda_gen_add_micmute_led(codec, update_huawei_wmi_micmute_led) < 0);
> > +
> > +       }
> > +
> > +       if (huawei_wmi_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
> > +               symbol_put(huawei_wmi_micmute_led_set);
> > +               huawei_wmi_micmute_led_set_func = NULL;
> > +       }
> > +}
> 
> Takashi, is it a way how the rest sound drivers are written? B/c this
> symbol_request(s) look to me a bit ugly.

It's a workaround for not having a hard dependency.  The HD-audio
codec driver is generic, and we don't want to load the multiple WMI
drivers always for using a Realtek codec.

Ugly, yes, but simple enough.


thanks,

Takashi

Re: [PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[Andy Shevchenko]

On Fri, Nov 2, 2018 at 8:30 PM Takashi Iwai <tiwai@suse.de> wrote:
> On Fri, 02 Nov 2018 19:12:44 +0100,
> Andy Shevchenko wrote:
> >
> > > +       if (action == HDA_FIXUP_ACT_PROBE) {
> > > +               if (!huawei_wmi_micmute_led_set_func)
> > > +                       huawei_wmi_micmute_led_set_func = symbol_request(huawei_wmi_micmute_led_set);
> > > +               if (!huawei_wmi_micmute_led_set_func) {
> > > +                       codec_warn(codec, "Failed to find huawei_wmi symbol huawei_wmi_micmute_led_set\n");
> > > +                       return;
> > > +               }
> > > +               removefunc = (huawei_wmi_micmute_led_set_func(false) < 0)
> > > +                       || (snd_hda_gen_add_micmute_led(codec, update_huawei_wmi_micmute_led) < 0);
> > > +
> > > +       }
> > > +
> > > +       if (huawei_wmi_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
> > > +               symbol_put(huawei_wmi_micmute_led_set);
> > > +               huawei_wmi_micmute_led_set_func = NULL;
> > > +       }
> > > +}
> >
> > Takashi, is it a way how the rest sound drivers are written? B/c this
> > symbol_request(s) look to me a bit ugly.
>
> It's a workaround for not having a hard dependency.  The HD-audio
> codec driver is generic, and we don't want to load the multiple WMI
> drivers always for using a Realtek codec.
>
> Ugly, yes, but simple enough.

Okay, thanks for elaboration.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 1/3] x86: add support for Huawei WMI hotkeys.

[ayman.bagabas]

On Fri, 2018-11-02 at 20:20 +0200, Andy Shevchenko wrote:
> On Fri, Nov 2, 2018 at 6:11 AM Ayman Bagabas <ayman.bagabas@gmail.com
> > wrote:
> > 
> > This driver adds support for missing hotkeys on some Huawei
> > laptops.
> > Currently, only Huawei Matebook X Pro is supported. The driver
> > recognizes the following keys: brightness keys, micmute, wlan, and
> > Huawei special key. The brightness keys are ignored since they work
> > out
> > of the box.
> > +config HUAWEI_LAPTOP
> > +       tristate "Huawei WMI hotkeys driver"
> > +       depends on ACPI
> > +       depends on ACPI_WMI
> 
> 
> > +       depends on INPUT
> > +       select INPUT_SPARSEKMAP
> > +       help
> > +         This driver provides support for Huawei WMI hotkeys.
> > +         It enables the missing keys and adds support to micmute
> > +         led found on these laptops.q
> > +         Supported devices are:
> > +         - Matebook X Pro
> 
> 
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + *  Huawei WMI Hotkeys Driver
> > + *
> > + *  Copyright (C) 2018           Ayman Bagabas <
> > ayman.bagabas@gmail.com>
> > + *
> > + *  This program is free software: you can redistribute it and/or
> > modify
> > + *  it under the terms of the GNU General Public License as
> > published by
> > + *  the Free Software Foundation, either version 2 of the License,
> > or
> > + *  (at your option) any later version.
> > + *
> > + *  This program is distributed in the hope that it will be
> > useful,
> > + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + *  GNU General Public License for more details.
> > + *
> > + *  You should have received a copy of the GNU General Public
> > License
> > + *  along with this program.  If not, see <
> > https://www.gnu.org/licenses/>.
> > + *
> > + */
> > +MODULE_LICENSE("GPL");
> 
> 
> Here you have the following issues:
> - inconsistency between IDs for license (fix accordingly)
> - SDPX _and_ License header (remove latter)
> 
> 
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/init.h>
> 
> Choose one of them.
> 
> > +#include <linux/input.h>
> > +#include <linux/input/sparse-keymap.h>
> > +#include <linux/acpi.h>
> > +#include <linux/wmi.h>
> 
> Please, keep in order.

What order do I have to follow? Does this look right?
module.h
init.h
apci.h
wmi.h
input.h
sparse-keymap.h

> 
> > +static const struct key_entry huawei_wmi_keymap[] __initconst = {
> > +               { KE_IGNORE, 0x281, { KEY_BRIGHTNESSDOWN } },
> > +               { KE_IGNORE, 0x282, { KEY_BRIGHTNESSUP } },
> > +               { KE_KEY,       0x287, { KEY_MICMUTE } },
> > +               { KE_KEY,       0x289, { KEY_WLAN } },
> > +               // Huawei |M| button
> > +               { KE_KEY,       0x28a, { KEY_PROG1 } },
> > +               { KE_END,       0 }
> > +};
> > +
> > +struct huawei_wmi_device {
> > +       struct input_dev *inputdev;
> > +};
> 
> Apparently no need to have this, you may use struct input_dev
> directly, isn't it?
> 
> > +static struct huawei_wmi_device *wmi_device;
> 
> No global variables, please.

What about input_dev as a global variable? How would
input_unregister_device access input_dev on exit if it wasn't global?

> 
> > +int huawei_wmi_micmute_led_set(bool on)
> > +{
> > +       u32 args = (on) ? MICMUTE_LED_ON : MICMUTE_LED_OFF;
> 
> Redundant parens.
> 
> > +       struct acpi_buffer input = { (acpi_size)sizeof(args), &args
> > };
> > +       acpi_status status;
> > +
> > +       status = wmi_evaluate_method(AMW0_GUID, 0, 1, &input,
> > NULL);
> > +       if (ACPI_FAILURE(status))
> > +               return status;
> > +
> > +       return 0;
> > +}
> > +static void huawei_wmi_process_key(struct input_dev *input_dev,
> > int code)
> > +{
> > +       const struct key_entry *key;
> > +
> > +       key = sparse_keymap_entry_from_scancode(input_dev, code);
> > +
> 
> This blank line is redundant.
> 
> > +       if (!key) {
> > +               pr_info("%s: Unknown key pressed, code: 0x%04x\n",
> > +                                       MODULE_NAME, code);
> 
> dev_info(); no MODULE_NAME, please.
> 
> > +               return;
> > +       }
> > +
> > +       sparse_keymap_report_entry(input_dev, key, 1, true);
> > +}
> > +static void huawei_wmi_notify(u32 value, void *context)
> > +{
> > +       struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL
> > };
> > +       union acpi_object *obj;
> > +       acpi_status status;
> > +
> > +       status = wmi_get_event_data(value, &response);
> > +       if (ACPI_FAILURE(status)) {
> > +               pr_err("%s: Bad event status 0x%x\n",
> > +                                       MODULE_NAME, status);
> 
> No MODULE_NAME, please.
> If needed, use pr_fmt() macro.
> 
> But I'm pretty sure you may pass pointer to input device and use
> dev_err().
> 
> > +               return;
> > +       }
> > +
> > +       obj = (union acpi_object *)response.pointer;
> > +
> 
> No redundant blank lines, please.
> 
> > +       if (!obj)
> > +               return;
> > +
> > +       if (obj->type == ACPI_TYPE_INTEGER)
> > +               huawei_wmi_process_key(wmi_device->inputdev,
> > +                                                       obj-
> > >integer.value);
> > +       else
> > +               pr_info("%s: Unknown response received %d\n",
> > +                                       MODULE_NAME, obj->type);
> 
> Ditto about module name.
> 
> > +
> > +       kfree(response.pointer);
> > +}
> > +
> > +static int huawei_input_init(void)
> > +{
> > +       acpi_status status;
> > +       int err;
> > +       status = wmi_install_notify_handler(EVENT_GUID,
> > +                       huawei_wmi_notify,
> > +                       NULL);
> 
> Pointer to the input device instead of NULL.
> 
> > +
> 
> No redundant blank lines, please.
> 
> > +       if (ACPI_FAILURE(status)) {
> > +               err = -EIO;
> > +               goto err_free_dev;
> > +       }
> > +}
> 
> 
> > +       wmi_device = kmalloc(sizeof(struct huawei_wmi_device),
> > GFP_KERNEL);
> 
> sizeof(*wmi_device)
> 
> > +       if (!wmi_device)
> > +               return -ENOMEM;
> > +}
> 
> 
> > +       pr_debug("%s: Driver unloaded successfully\n",
> > MODULE_NAME);
> 
> Noise.
> 
> --
> With Best Regards,
> Andy Shevchenko

Re: [PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[ayman.bagabas]

On Fri, 2018-11-02 at 20:12 +0200, Andy Shevchenko wrote:
> On Fri, Nov 2, 2018 at 6:12 AM Ayman Bagabas <ayman.bagabas@gmail.com
> > wrote:
> > 
> > Some of Huawei laptops come with a LED in the mic mute key. This
> > patch
> > enables and disable this LED accordingly.
> > --- a/drivers/platform/x86/huawei_wmi.c
> > +++ b/drivers/platform/x86/huawei_wmi.c
> > @@ -26,6 +26,7 @@
> >  #include <linux/input/sparse-keymap.h>
> >  #include <linux/acpi.h>
> >  #include <linux/wmi.h>
> > +#include <linux/huawei_wmi.h>
> 
> Keep it in order and put under
> include/linux/platform_data/x86/
> folder.
> 
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +#ifndef __HUAWEI_WMI_H__
> > +#define __HUAWEI_WMI_H__
> > +
> > +int huawei_wmi_micmute_led_set(bool on);
> > +
> > +#endif
> 
> This has to cover !HUAWEI_LAPTOP case.
> 
> > +/* Helper functions for Huawei WMI Mic Mute LED;
> > + * to be included from codec driver
> > + */
> 
> Comment style.

/* Helper functions for Huawei WMI micmute led;
 * to be included from codec driver
 */

> 
> > +#if IS_ENABLED(CONFIG_HUAWEI_LAPTOP)
> 
> See above
> 
> > +static int (*huawei_wmi_micmute_led_set_func)(bool);
> 
> Why is that?

This is used with symbol_request and then in the update function to
locate the function from the wmi device. But I guess you are right, we
could use the function defined in the header file directly.

> 
> > +       if (action == HDA_FIXUP_ACT_PROBE) {
> > +               if (!huawei_wmi_micmute_led_set_func)
> > +                       huawei_wmi_micmute_led_set_func =
> > symbol_request(huawei_wmi_micmute_led_set);
> > +               if (!huawei_wmi_micmute_led_set_func) {
> > +                       codec_warn(codec, "Failed to find
> > huawei_wmi symbol huawei_wmi_micmute_led_set\n");
> > +                       return;
> > +               }
> > +               removefunc =
> > (huawei_wmi_micmute_led_set_func(false) < 0)
> > +                       || (snd_hda_gen_add_micmute_led(codec,
> > update_huawei_wmi_micmute_led) < 0);
> > +
> > +       }
> > +
> > +       if (huawei_wmi_micmute_led_set_func && (action ==
> > HDA_FIXUP_ACT_FREE || removefunc)) {
> > +               symbol_put(huawei_wmi_micmute_led_set);
> > +               huawei_wmi_micmute_led_set_func = NULL;
> > +       }
> > +}
> 
> Takashi, is it a way how the rest sound drivers are written? B/c this
> symbol_request(s) look to me a bit ugly.
> 
> > +/* for alc_fixup_huawei_micmute_led */
> > +#include "huawei_wmi_helper.c"
> 
> Ditto.
> 
> Include *.c?! Huh?

Is that the wrong way? Should I define the functions directly into
patch_realtek.c?

> 

Re: [PATCH v2 1/3] x86: add support for Huawei WMI hotkeys.

[Takashi Iwai]

On Sat, 03 Nov 2018 00:10:18 +0100,
<ayman.bagabas@gmail.com> wrote:
> 
> On Fri, 2018-11-02 at 20:20 +0200, Andy Shevchenko wrote:
> > > +#include <linux/input.h>
> > > +#include <linux/input/sparse-keymap.h>
> > > +#include <linux/acpi.h>
> > > +#include <linux/wmi.h>
> > 
> > Please, keep in order.
> 
> What order do I have to follow? Does this look right?
> module.h
> init.h
> apci.h
> wmi.h
> input.h
> sparse-keymap.h

A most common pattern is the alphabetical order.


thanks,

Takashi

Re: [PATCH v2 1/3] x86: add support for Huawei WMI hotkeys.

[Takashi Iwai]

On Sat, 03 Nov 2018 00:10:18 +0100,
<ayman.bagabas@gmail.com> wrote:
> 
> On Fri, 2018-11-02 at 20:20 +0200, Andy Shevchenko wrote:
> > > +#include <linux/input.h>
> > > +#include <linux/input/sparse-keymap.h>
> > > +#include <linux/acpi.h>
> > > +#include <linux/wmi.h>
> > 
> > Please, keep in order.
> 
> What order do I have to follow? Does this look right?
> module.h
> init.h
> apci.h
> wmi.h
> input.h
> sparse-keymap.h

A most common pattern is the alphabetical order.


thanks,

Takashi

Re: [PATCH v2 3/3] ALSA: hda: add support for Huawei WMI MicMute LED

[Andy Shevchenko]

On Sat, Nov 3, 2018 at 1:21 AM <ayman.bagabas@gmail.com> wrote:
> On Fri, 2018-11-02 at 20:12 +0200, Andy Shevchenko wrote:
> > On Fri, Nov 2, 2018 at 6:12 AM Ayman Bagabas <ayman.bagabas@gmail.com
> > > wrote:

Takashi explained me, that is the way sound driver are using the
external symbols, so, follow his suggestion.

> > > +static int (*huawei_wmi_micmute_led_set_func)(bool);
> >
> > Why is that?
>
> This is used with symbol_request and then in the update function to
> locate the function from the wmi device. But I guess you are right, we
> could use the function defined in the header file directly.

> > Takashi, is it a way how the rest sound drivers are written? B/c this
> > symbol_request(s) look to me a bit ugly.
> >
> > > +/* for alc_fixup_huawei_micmute_led */
> > > +#include "huawei_wmi_helper.c"
> >
> > Ditto.
> >
> > Include *.c?! Huh?
>
> Is that the wrong way? Should I define the functions directly into
> patch_realtek.c?


-- 
With Best Regards,
Andy Shevchenko