platform/x86: x86-android-tablets: Add support for more then 1 gpio_key

Modify the gpio_keys support in x86_android_tablet_init() for
tablets which have more then 1 key/button which needs to be handled
by the gpio_keys driver.

This requires copying over the struct gpio_keys_button from
the x86_gpio_button struct array to a new gpio_keys_button struct array,
as an added benefit this allows marking the per model x86_gpio_button
arrays __initconst so that they all can be freed after module init().

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230505205901.42649-1-hdegoede@redhat.com

5 files changed, 34 insertions, 17 deletions

diff --git a/drivers/platform/x86/x86-android-tablets/asus.c b/drivers/platform/x86/x86-android-tablets/asus.c
index 2aca91678219..f9c4083be86d 100644
--- a/drivers/platform/x86/x86-android-tablets/asus.c
+++ b/drivers/platform/x86/x86-android-tablets/asus.c
@@ -24,7 +24,7 @@ static struct gpiod_lookup_table int3496_gpo2_pin22_gpios = {
 	},
 };
 
-static struct x86_gpio_button asus_me176c_tf103c_lid = {
+static const struct x86_gpio_button asus_me176c_tf103c_lid __initconst = {
 	.button = {
 		.code = SW_LID,
 		.active_low = true,
@@ -175,6 +175,7 @@ const struct x86_dev_info asus_me176c_info __initconst = {
 	.serdev_info = asus_me176c_serdevs,
 	.serdev_count = ARRAY_SIZE(asus_me176c_serdevs),
 	.gpio_button = &asus_me176c_tf103c_lid,
+	.gpio_button_count = 1,
 	.gpiod_lookup_tables = asus_me176c_gpios,
 	.bat_swnode = &generic_lipo_hv_4v35_battery_node,
 	.modules = bq24190_modules,
@@ -317,6 +318,7 @@ const struct x86_dev_info asus_tf103c_info __initconst = {
 	.pdev_info = int3496_pdevs,
 	.pdev_count = 1,
 	.gpio_button = &asus_me176c_tf103c_lid,
+	.gpio_button_count = 1,
 	.gpiod_lookup_tables = asus_tf103c_gpios,
 	.bat_swnode = &asus_tf103c_battery_node,
 	.modules = bq24190_modules,
diff --git a/drivers/platform/x86/x86-android-tablets/core.c b/drivers/platform/x86/x86-android-tablets/core.c
index 245167674aa2..2fd6060a31bb 100644
--- a/drivers/platform/x86/x86-android-tablets/core.c
+++ b/drivers/platform/x86/x86-android-tablets/core.c
@@ -124,6 +124,7 @@ static int serdev_count;
 static struct i2c_client **i2c_clients;
 static struct platform_device **pdevs;
 static struct serdev_device **serdevs;
+static struct gpio_keys_button *buttons;
 static struct gpiod_lookup_table * const *gpiod_lookup_tables;
 static const struct software_node *bat_swnode;
 static void (*exit_handler)(void);
@@ -238,6 +239,7 @@ static void x86_android_tablet_cleanup(void)
 		platform_device_unregister(pdevs[i]);
 
 	kfree(pdevs);
+	kfree(buttons);
 
 	for (i = 0; i < i2c_client_count; i++)
 		i2c_unregister_device(i2c_clients[i]);
@@ -353,22 +355,30 @@ static __init int x86_android_tablet_init(void)
 		}
 	}
 
-	if (dev_info->gpio_button) {
-		struct gpio_keys_platform_data pdata = {
-			.buttons = &dev_info->gpio_button->button,
-			.nbuttons = 1,
-		};
+	if (dev_info->gpio_button_count) {
+		struct gpio_keys_platform_data pdata = { };
 		struct gpio_desc *gpiod;
 
-		/* Get GPIO for the gpio-button */
-		ret = x86_android_tablet_get_gpiod(dev_info->gpio_button->chip,
-						   dev_info->gpio_button->pin, &gpiod);
-		if (ret < 0) {
+		buttons = kcalloc(dev_info->gpio_button_count, sizeof(*buttons), GFP_KERNEL);
+		if (!buttons) {
 			x86_android_tablet_cleanup();
-			return ret;
+			return -ENOMEM;
+		}
+
+		for (i = 0; i < dev_info->gpio_button_count; i++) {
+			ret = x86_android_tablet_get_gpiod(dev_info->gpio_button[i].chip,
+							   dev_info->gpio_button[i].pin, &gpiod);
+			if (ret < 0) {
+				x86_android_tablet_cleanup();
+				return ret;
+			}
+
+			buttons[i] = dev_info->gpio_button[i].button;
+			buttons[i].gpio = desc_to_gpio(gpiod);
 		}
 
-		dev_info->gpio_button->button.gpio = desc_to_gpio(gpiod);
+		pdata.buttons = buttons;
+		pdata.nbuttons = dev_info->gpio_button_count;
 
 		pdevs[pdev_count] = platform_device_register_data(NULL, "gpio-keys",
 								  PLATFORM_DEVID_AUTO,
diff --git a/drivers/platform/x86/x86-android-tablets/lenovo.c b/drivers/platform/x86/x86-android-tablets/lenovo.c
index 50031e902a2c..26a4ef670ad7 100644
--- a/drivers/platform/x86/x86-android-tablets/lenovo.c
+++ b/drivers/platform/x86/x86-android-tablets/lenovo.c
@@ -160,7 +160,7 @@ static const struct x86_serdev_info lenovo_yb1_x90_serdevs[] __initconst = {
 	},
 };
 
-static struct x86_gpio_button lenovo_yb1_x90_lid = {
+static const struct x86_gpio_button lenovo_yb1_x90_lid __initconst = {
 	.button = {
 		.code = SW_LID,
 		.active_low = true,
@@ -232,6 +232,7 @@ const struct x86_dev_info lenovo_yogabook_x90_info __initconst = {
 	.serdev_info = lenovo_yb1_x90_serdevs,
 	.serdev_count = ARRAY_SIZE(lenovo_yb1_x90_serdevs),
 	.gpio_button = &lenovo_yb1_x90_lid,
+	.gpio_button_count = 1,
 	.gpiod_lookup_tables = lenovo_yb1_x90_gpios,
 	.init = lenovo_yb1_x90_init,
 };
@@ -268,7 +269,7 @@ static const struct software_node lenovo_yoga_tab2_830_1050_bq24190_node = {
 	.properties = lenovo_yoga_tab2_830_1050_bq24190_props,
 };
 
-static struct x86_gpio_button lenovo_yoga_tab2_830_1050_lid = {
+static const struct x86_gpio_button lenovo_yoga_tab2_830_1050_lid __initconst = {
 	.button = {
 		.code = SW_LID,
 		.active_low = true,
@@ -394,6 +395,7 @@ const struct x86_dev_info lenovo_yoga_tab2_830_1050_info __initconst = {
 	.pdev_info = int3496_pdevs,
 	.pdev_count = 1,
 	.gpio_button = &lenovo_yoga_tab2_830_1050_lid,
+	.gpio_button_count = 1,
 	.gpiod_lookup_tables = lenovo_yoga_tab2_830_1050_gpios,
 	.bat_swnode = &generic_lipo_hv_4v35_battery_node,
 	.modules = bq24190_modules,
diff --git a/drivers/platform/x86/x86-android-tablets/other.c b/drivers/platform/x86/x86-android-tablets/other.c
index 3754d2453cdb..4d54c89e6ca2 100644
--- a/drivers/platform/x86/x86-android-tablets/other.c
+++ b/drivers/platform/x86/x86-android-tablets/other.c
@@ -94,7 +94,7 @@ const struct x86_dev_info acer_b1_750_info __initconst = {
  * which is not described in the ACPI tables in anyway.
  * Use the x86-android-tablets infra to create a gpio-button device for this.
  */
-static struct x86_gpio_button advantech_mica_071_button = {
+static const struct x86_gpio_button advantech_mica_071_button __initconst = {
 	.button = {
 		.code = KEY_PROG1,
 		.active_low = true,
@@ -109,6 +109,7 @@ static struct x86_gpio_button advantech_mica_071_button = {
 
 const struct x86_dev_info advantech_mica_071_info __initconst = {
 	.gpio_button = &advantech_mica_071_button,
+	.gpio_button_count = 1,
 };
 
 /*
@@ -449,7 +450,7 @@ const struct x86_dev_info nextbook_ares8a_info __initconst = {
  * This button has a WMI interface, but that is broken. Instead of trying to
  * use the broken WMI interface, instantiate a gpio_keys device for this.
  */
-static struct x86_gpio_button peaq_c1010_button = {
+static const struct x86_gpio_button peaq_c1010_button __initconst = {
 	.button = {
 		.code = KEY_SOUND,
 		.active_low = true,
@@ -464,6 +465,7 @@ static struct x86_gpio_button peaq_c1010_button = {
 
 const struct x86_dev_info peaq_c1010_info __initconst = {
 	.gpio_button = &peaq_c1010_button,
+	.gpio_button_count = 1,
 	/*
 	 * Move the ACPI event handler used by the broken WMI interface out of
 	 * the way. This is the only event handler on INT33FC:00.
diff --git a/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h b/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
index 8e9f7238015c..8f04a052eada 100644
--- a/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
+++ b/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
@@ -73,10 +73,11 @@ struct x86_dev_info {
 	const struct x86_i2c_client_info *i2c_client_info;
 	const struct platform_device_info *pdev_info;
 	const struct x86_serdev_info *serdev_info;
-	struct x86_gpio_button *gpio_button;
+	const struct x86_gpio_button *gpio_button;
 	int i2c_client_count;
 	int pdev_count;
 	int serdev_count;
+	int gpio_button_count;
 	int (*init)(void);
 	void (*exit)(void);
 };