The MS Surfaces are not directly using the PNP0C40 device for the buttons
but instead a MSHW0028. This one is bound on a I2C bus and so we need to
use a separate driver for it.
One noticeable change is that the original soc_button_array fails
to rmmod and then modprobe when using KBUILD_MODNAME as the gpiod con_id
with the Surface 3. Add this as a parameter of the new API.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
new in v2
drivers/input/misc/soc_button_array.c | 108 +++++++++++++++++++--------------
include/linux/input/soc_button_array.h | 37 +++++++++++
2 files changed, 98 insertions(+), 47 deletions(-)
create mode 100644 include/linux/input/soc_button_array.h
diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index 077e06e4..96012f9 100644
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -19,23 +19,7 @@
#include <linux/gpio_keys.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
-
-/*
- * Definition of buttons on the tablet. The ACPI index of each button
- * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC
- * Platforms"
- */
-#define MAX_NBUTTONS 5
-
-struct soc_button_info {
- const char *name;
- int acpi_index;
- unsigned int event_type;
- unsigned int event_code;
- bool autorepeat;
- bool wakeup;
- bool active_low;
-};
+#include <linux/input/soc_button_array.h>
/*
* Some of the buttons like volume up/down are auto repeat, while others
@@ -51,12 +35,13 @@ struct soc_button_data {
/*
* Get the Nth GPIO number from the ACPI object.
*/
-static int soc_button_lookup_gpio(struct device *dev, int acpi_index)
+static int soc_button_lookup_gpio(struct device *dev, const char *con_id,
+ int acpi_index)
{
struct gpio_desc *desc;
int gpio;
- desc = gpiod_get_index(dev, KBUILD_MODNAME, acpi_index, GPIOD_ASIS);
+ desc = gpiod_get_index(dev, con_id, acpi_index, GPIOD_ASIS);
if (IS_ERR(desc))
return PTR_ERR(desc);
@@ -68,7 +53,8 @@ static int soc_button_lookup_gpio(struct device *dev, int acpi_index)
}
static struct platform_device *
-soc_button_device_create(struct platform_device *pdev,
+soc_button_device_create(struct device *dev,
+ const char *gpiod_con_id,
const struct soc_button_info *button_info,
bool autorepeat)
{
@@ -80,7 +66,7 @@ soc_button_device_create(struct platform_device *pdev,
int gpio;
int i, error;
- gpio_keys_pdata = devm_kzalloc(&pdev->dev,
+ gpio_keys_pdata = devm_kzalloc(dev,
sizeof(*gpio_keys_pdata) +
sizeof(*gpio_keys) * MAX_NBUTTONS,
GFP_KERNEL);
@@ -93,7 +79,9 @@ soc_button_device_create(struct platform_device *pdev,
if (info->autorepeat != autorepeat)
continue;
- gpio = soc_button_lookup_gpio(&pdev->dev, info->acpi_index);
+ gpio = soc_button_lookup_gpio(dev,
+ gpiod_con_id,
+ info->acpi_index);
if (!gpio_is_valid(gpio))
continue;
@@ -142,14 +130,12 @@ soc_button_device_create(struct platform_device *pdev,
err_free_pdev:
platform_device_put(pd);
err_free_mem:
- devm_kfree(&pdev->dev, gpio_keys_pdata);
+ devm_kfree(dev, gpio_keys_pdata);
return ERR_PTR(error);
}
-static int soc_button_remove(struct platform_device *pdev)
+int soc_dev_button_remove(struct soc_button_data *priv)
{
- struct soc_button_data *priv = platform_get_drvdata(pdev);
-
int i;
for (i = 0; i < BUTTON_TYPES; i++)
@@ -158,40 +144,28 @@ static int soc_button_remove(struct platform_device *pdev)
return 0;
}
+EXPORT_SYMBOL_GPL(soc_dev_button_remove);
-static int soc_button_probe(struct platform_device *pdev)
+int soc_dev_button_enumerate(struct device *dev, struct soc_button_data *priv,
+ const char *gpiod_con_id,
+ struct soc_button_info *button_info)
{
- struct device *dev = &pdev->dev;
- const struct acpi_device_id *id;
- struct soc_button_info *button_info;
- struct soc_button_data *priv;
struct platform_device *pd;
int i;
int error;
- id = acpi_match_device(dev->driver->acpi_match_table, dev);
- if (!id)
- return -ENODEV;
-
- button_info = (struct soc_button_info *)id->driver_data;
-
- if (gpiod_count(&pdev->dev, KBUILD_MODNAME) <= 0) {
- dev_info(&pdev->dev, "no GPIO attached, ignoring...\n");
+ if (gpiod_count(dev, gpiod_con_id) <= 0) {
+ dev_info(dev, "no GPIO attached, ignoring...\n");
return -ENODEV;
}
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- platform_set_drvdata(pdev, priv);
-
for (i = 0; i < BUTTON_TYPES; i++) {
- pd = soc_button_device_create(pdev, button_info, i == 0);
+ pd = soc_button_device_create(dev, gpiod_con_id, button_info,
+ i == 0);
if (IS_ERR(pd)) {
error = PTR_ERR(pd);
if (error != -ENODEV) {
- soc_button_remove(pdev);
+ soc_dev_button_remove(priv);
return error;
}
continue;
@@ -205,6 +179,46 @@ static int soc_button_probe(struct platform_device *pdev)
return 0;
}
+EXPORT_SYMBOL_GPL(soc_dev_button_enumerate);
+
+struct soc_button_data *soc_dev_button_data_allocate(struct device *dev)
+{
+ return devm_kzalloc(dev, sizeof(struct soc_button_data), GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(soc_dev_button_data_allocate);
+
+static int soc_button_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct acpi_device_id *id;
+ struct soc_button_info *button_info;
+ struct soc_button_data *priv;
+ int error;
+
+ id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!id)
+ return -ENODEV;
+
+ button_info = (struct soc_button_info *)id->driver_data;
+
+ priv = soc_dev_button_data_allocate(dev);
+ if (!priv)
+ return -ENOMEM;
+
+ error = soc_dev_button_enumerate(dev, priv, KBUILD_MODNAME,
+ button_info);
+ if (error)
+ return error;
+
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+}
+
+static int soc_button_remove(struct platform_device *pdev)
+{
+ return soc_dev_button_remove(platform_get_drvdata(pdev));
+}
static struct soc_button_info soc_button_PNP0C40[] = {
{ "power", 0, EV_KEY, KEY_POWER, false, true, true },
diff --git a/include/linux/input/soc_button_array.h b/include/linux/input/soc_button_array.h
new file mode 100644
index 0000000..634ce90
--- /dev/null
+++ b/include/linux/input/soc_button_array.h
@@ -0,0 +1,37 @@
+/*
+ * Supports for the button array on SoC tablets originally running
+ * Windows 8.
+ *
+ * (C) Copyright 2014 Intel Corporation
+ * (C) Copyright 2016 Red Hat, Inc
+ *
+ * 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; version 2
+ * of the License.
+ */
+
+/*
+ * Definition of buttons on the tablet. The ACPI index of each button
+ * is defined in section 2.8.7.2 of "Windows ACPI Design Guide for SoC
+ * Platforms"
+ */
+#define MAX_NBUTTONS 5
+
+struct soc_button_info {
+ const char *name;
+ int acpi_index;
+ unsigned int event_type;
+ unsigned int event_code;
+ bool autorepeat;
+ bool wakeup;
+ bool active_low;
+};
+
+struct soc_button_data;
+
+struct soc_button_data *soc_dev_button_data_allocate(struct device *dev);
+int soc_dev_button_remove(struct soc_button_data *priv);
+int soc_dev_button_enumerate(struct device *dev, struct soc_button_data *priv,
+ const char *gpiod_con_id,
+ struct soc_button_info *button_info);
--
2.5.0
--
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