302 lines
9 KiB
Diff
302 lines
9 KiB
Diff
From 6da968469522a258e270802d28b9d5c3f39f6c9d Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Sat, 20 Jul 2019 23:56:55 +0200
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Subject: [PATCH 03/12] buttons
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---
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drivers/input/misc/Kconfig | 6 +-
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drivers/input/misc/soc_button_array.c | 141 ++++++++++++++++++++--
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drivers/platform/x86/surfacepro3_button.c | 47 ++++++++
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3 files changed, 178 insertions(+), 16 deletions(-)
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diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
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index ca59a2be9bc5..ea69610370e8 100644
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--- a/drivers/input/misc/Kconfig
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+++ b/drivers/input/misc/Kconfig
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@@ -781,10 +781,10 @@ config INPUT_IDEAPAD_SLIDEBAR
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config INPUT_SOC_BUTTON_ARRAY
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tristate "Windows-compatible SoC Button Array"
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- depends on KEYBOARD_GPIO
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+ depends on KEYBOARD_GPIO && ACPI
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help
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- Say Y here if you have a SoC-based tablet that originally
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- runs Windows 8.
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+ Say Y here if you have a SoC-based tablet that originally runs
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+ Windows 8 or a Microsoft Surface Book 2, Pro 5, Laptop 1 or later.
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To compile this driver as a module, choose M here: the
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module will be called soc_button_array.
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diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
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index 55cd6e0b409c..8c94acbbf574 100644
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--- a/drivers/input/misc/soc_button_array.c
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+++ b/drivers/input/misc/soc_button_array.c
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@@ -29,6 +29,17 @@ struct soc_button_info {
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bool wakeup;
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};
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+/**
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+ * struct soc_device_data - driver data for different device types
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+ * @button_info: specifications of buttons, if NULL specification is assumed to
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+ * be present in _DSD
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+ * @check: device-specific check (NULL means all will be accepted)
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+ */
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+struct soc_device_data {
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+ struct soc_button_info *button_info;
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+ int (*check)(struct device *dev);
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+};
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+
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/*
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* Some of the buttons like volume up/down are auto repeat, while others
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* are not. To support both, we register two platform devices, and put
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@@ -91,8 +102,13 @@ soc_button_device_create(struct platform_device *pdev,
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continue;
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gpio = soc_button_lookup_gpio(&pdev->dev, info->acpi_index);
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- if (!gpio_is_valid(gpio))
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+ if (gpio < 0 && gpio != -ENOENT) {
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+ error = gpio;
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+ goto err_free_mem;
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+ } else if (!gpio_is_valid(gpio)) {
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+ /* Skip GPIO if not present */
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continue;
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+ }
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gpio_keys[n_buttons].type = info->event_type;
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gpio_keys[n_buttons].code = info->event_code;
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@@ -310,6 +326,7 @@ static int soc_button_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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const struct acpi_device_id *id;
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+ struct soc_device_data *device_data;
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struct soc_button_info *button_info;
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struct soc_button_data *priv;
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struct platform_device *pd;
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@@ -320,18 +337,20 @@ static int soc_button_probe(struct platform_device *pdev)
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if (!id)
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return -ENODEV;
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- if (!id->driver_data) {
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+ device_data = (struct soc_device_data *)id->driver_data;
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+ if (device_data && device_data->check) {
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+ error = device_data->check(dev);
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+ if (error)
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+ return error;
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+ }
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+
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+ if (device_data && device_data->button_info) {
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+ button_info = (struct soc_button_info *)
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+ device_data->button_info;
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+ } else {
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button_info = soc_button_get_button_info(dev);
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if (IS_ERR(button_info))
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return PTR_ERR(button_info);
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- } else {
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- button_info = (struct soc_button_info *)id->driver_data;
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- }
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-
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- error = gpiod_count(dev, NULL);
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- if (error < 0) {
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- dev_dbg(dev, "no GPIO attached, ignoring...\n");
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- return -ENODEV;
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}
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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@@ -357,12 +376,32 @@ static int soc_button_probe(struct platform_device *pdev)
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if (!priv->children[0] && !priv->children[1])
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return -ENODEV;
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- if (!id->driver_data)
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+ if (!device_data || !device_data->button_info)
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devm_kfree(dev, button_info);
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return 0;
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}
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+
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+static int soc_device_check_generic(struct device *dev)
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+{
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+ int gpios;
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+
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+ gpios = gpiod_count(dev, NULL);
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+ if (gpios < 0) {
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+ dev_dbg(dev, "no GPIO attached, ignoring...\n");
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+ return -ENODEV;
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+ }
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+
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+ return 0;
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+}
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+
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+static struct soc_device_data soc_device_ACPI0011 = {
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+ .button_info = NULL,
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+ .check = soc_device_check_generic,
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+};
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+
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+
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/*
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* Definition of buttons on the tablet. The ACPI index of each button
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* is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC
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@@ -377,9 +416,85 @@ static struct soc_button_info soc_button_PNP0C40[] = {
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{ }
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};
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+static struct soc_device_data soc_device_PNP0C40 = {
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+ .button_info = soc_button_PNP0C40,
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+ .check = soc_device_check_generic,
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+};
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+
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+
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+/*
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+ * Special device check for Surface Book 2 and Surface Pro (2017).
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+ * Both, the Surface Pro 4 (surfacepro3_button.c) and the above mentioned
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+ * devices use MSHW0040 for power and volume buttons, however the way they
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+ * have to be addressed differs. Make sure that we only load this drivers
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+ * for the correct devices by checking the OEM Platform Revision provided by
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+ * the _DSM method.
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+ */
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+#define MSHW0040_DSM_REVISION 0x01
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+#define MSHW0040_DSM_GET_OMPR 0x02 // get OEM Platform Revision
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+static const guid_t MSHW0040_DSM_UUID =
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+ GUID_INIT(0x6fd05c69, 0xcde3, 0x49f4, 0x95, 0xed, 0xab, 0x16, 0x65,
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+ 0x49, 0x80, 0x35);
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+
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+static int soc_device_check_MSHW0040(struct device *dev)
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+{
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+ acpi_handle handle = ACPI_HANDLE(dev);
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+ union acpi_object *result;
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+ u64 oem_platform_rev = 0; // valid revisions are nonzero
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+ int gpios;
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+
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+ // get OEM platform revision
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+ result = acpi_evaluate_dsm_typed(handle, &MSHW0040_DSM_UUID,
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+ MSHW0040_DSM_REVISION,
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+ MSHW0040_DSM_GET_OMPR, NULL,
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+ ACPI_TYPE_INTEGER);
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+
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+ if (result) {
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+ oem_platform_rev = result->integer.value;
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+ ACPI_FREE(result);
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+ }
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+
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+ /*
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+ * If the revision is zero here, the _DSM evaluation has failed. This
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+ * indicates that we have a Pro 4 or Book 1 and this driver should not
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+ * be used.
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+ */
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+ if (oem_platform_rev == 0)
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+ return -ENODEV;
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+
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+ dev_dbg(dev, "OEM Platform Revision %llu\n", oem_platform_rev);
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+
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+ gpios = gpiod_count(dev, NULL);
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+ if (gpios < 0)
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+ return -ENODEV;
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+
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+ return 0;
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+}
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+
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+/*
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+ * Button infos for Microsoft Surface Book 2 and Surface Pro (2017).
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+ * Obtained from DSDT/testing.
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+ */
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+static struct soc_button_info soc_button_MSHW0040[] = {
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+ { "power", 0, EV_KEY, KEY_POWER, false, true },
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+ { "volume_up", 2, EV_KEY, KEY_VOLUMEUP, true, false },
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+ { "volume_down", 4, EV_KEY, KEY_VOLUMEDOWN, true, false },
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+ { }
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+};
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+
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+static struct soc_device_data soc_device_MSHW0040 = {
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+ .button_info = soc_button_MSHW0040,
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+ .check = soc_device_check_MSHW0040,
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+};
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+
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+
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static const struct acpi_device_id soc_button_acpi_match[] = {
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- { "PNP0C40", (unsigned long)soc_button_PNP0C40 },
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- { "ACPI0011", 0 },
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+ { "PNP0C40", (unsigned long)&soc_device_PNP0C40 },
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+ { "ACPI0011", (unsigned long)&soc_device_ACPI0011 },
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+
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+ /* Microsoft Surface Devices (5th and 6th generation) */
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+ { "MSHW0040", (unsigned long)&soc_device_MSHW0040 },
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+
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{ }
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};
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diff --git a/drivers/platform/x86/surfacepro3_button.c b/drivers/platform/x86/surfacepro3_button.c
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index 1b491690ce07..96627627060e 100644
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--- a/drivers/platform/x86/surfacepro3_button.c
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+++ b/drivers/platform/x86/surfacepro3_button.c
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@@ -24,6 +24,12 @@
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#define SURFACE_BUTTON_OBJ_NAME "VGBI"
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#define SURFACE_BUTTON_DEVICE_NAME "Surface Pro 3/4 Buttons"
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+#define MSHW0040_DSM_REVISION 0x01
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+#define MSHW0040_DSM_GET_OMPR 0x02 // get OEM Platform Revision
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+static const guid_t MSHW0040_DSM_UUID =
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+ GUID_INIT(0x6fd05c69, 0xcde3, 0x49f4, 0x95, 0xed, 0xab, 0x16, 0x65,
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+ 0x49, 0x80, 0x35);
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+
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#define SURFACE_BUTTON_NOTIFY_TABLET_MODE 0xc8
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#define SURFACE_BUTTON_NOTIFY_PRESS_POWER 0xc6
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@@ -146,6 +152,44 @@ static int surface_button_resume(struct device *dev)
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}
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#endif
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+/*
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+ * Surface Pro 4 and Surface Book 2 / Surface Pro 2017 use the same device
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+ * ID (MSHW0040) for the power/volume buttons. Make sure this is the right
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+ * device by checking for the _DSM method and OEM Platform Revision.
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+ *
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+ * Returns true if the driver should bind to this device, i.e. the device is
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+ * either MSWH0028 (Pro 3) or MSHW0040 on a Pro 4 or Book 1.
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+ */
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+static bool surface_button_check_MSHW0040(struct acpi_device *dev)
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+{
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+ acpi_handle handle = dev->handle;
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+ union acpi_object *result;
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+ u64 oem_platform_rev = 0; // valid revisions are nonzero
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+
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+ // get OEM platform revision
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+ result = acpi_evaluate_dsm_typed(handle, &MSHW0040_DSM_UUID,
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+ MSHW0040_DSM_REVISION,
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+ MSHW0040_DSM_GET_OMPR,
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+ NULL, ACPI_TYPE_INTEGER);
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+
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+ /*
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+ * If evaluating the _DSM fails, the method is not present. This means
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+ * that we have either MSHW0028 or MSHW0040 on Pro 4 or Book 1, so we
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+ * should use this driver. We use revision 0 indicating it is
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+ * unavailable.
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+ */
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+
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+ if (result) {
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+ oem_platform_rev = result->integer.value;
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+ ACPI_FREE(result);
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+ }
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+
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+ dev_dbg(&dev->dev, "OEM Platform Revision %llu\n", oem_platform_rev);
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+
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+ return oem_platform_rev == 0;
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+}
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+
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+
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static int surface_button_add(struct acpi_device *device)
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{
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struct surface_button *button;
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@@ -158,6 +202,9 @@ static int surface_button_add(struct acpi_device *device)
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strlen(SURFACE_BUTTON_OBJ_NAME)))
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return -ENODEV;
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+ if (!surface_button_check_MSHW0040(device))
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+ return -ENODEV;
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+
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button = kzalloc(sizeof(struct surface_button), GFP_KERNEL);
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if (!button)
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return -ENOMEM;
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--
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2.22.0
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