1 files changed, 91 insertions, 55 deletions

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index b3ec4f2de875..78fb32a7b103 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -22,6 +22,7 @@
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/input.h>
+#include <linux/irq.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/pm.h>
@@ -37,10 +38,15 @@
 #include <linux/mutex.h>
 #include <linux/acpi.h>
 #include <linux/of.h>
-#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/i2c/i2c-hid.h>
 
+#include "../hid-ids.h"
+
+/* quirks to control the device */
+#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV	BIT(0)
+
 /* flags */
 #define I2C_HID_STARTED		0
 #define I2C_HID_RESET_PENDING	1
@@ -143,10 +149,9 @@ struct i2c_hid {
 	char			*argsbuf;	/* Command arguments buffer */
 
 	unsigned long		flags;		/* device flags */
+	unsigned long		quirks;		/* Various quirks */
 
 	wait_queue_head_t	wait;		/* For waiting the interrupt */
-	struct gpio_desc	*desc;
-	int			irq;
 
 	struct i2c_hid_platform_data pdata;
 
@@ -154,6 +159,39 @@ struct i2c_hid {
 	struct mutex		reset_lock;
 };
 
+static const struct i2c_hid_quirks {
+	__u16 idVendor;
+	__u16 idProduct;
+	__u32 quirks;
+} i2c_hid_quirks[] = {
+	{ USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
+		I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+	{ USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
+		I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+	{ 0, 0 }
+};
+
+/*
+ * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
+ * @idVendor: the 16-bit vendor ID
+ * @idProduct: the 16-bit product ID
+ *
+ * Returns: a u32 quirks value.
+ */
+static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
+{
+	u32 quirks = 0;
+	int n;
+
+	for (n = 0; i2c_hid_quirks[n].idVendor; n++)
+		if (i2c_hid_quirks[n].idVendor == idVendor &&
+		    (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
+		     i2c_hid_quirks[n].idProduct == idProduct))
+			quirks = i2c_hid_quirks[n].quirks;
+
+	return quirks;
+}
+
 static int __i2c_hid_command(struct i2c_client *client,
 		const struct i2c_hid_cmd *command, u8 reportID,
 		u8 reportType, u8 *args, int args_len,
@@ -346,11 +384,27 @@ static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 
 	i2c_hid_dbg(ihid, "%s\n", __func__);
 
+	/*
+	 * Some devices require to send a command to wakeup before power on.
+	 * The call will get a return value (EREMOTEIO) but device will be
+	 * triggered and activated. After that, it goes like a normal device.
+	 */
+	if (power_state == I2C_HID_PWR_ON &&
+	    ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
+		ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
+
+		/* Device was already activated */
+		if (!ret)
+			goto set_pwr_exit;
+	}
+
 	ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 		0, NULL, 0, NULL, 0);
+
 	if (ret)
 		dev_err(&client->dev, "failed to change power setting.\n");
 
+set_pwr_exit:
 	return ret;
 }
 
@@ -716,9 +770,11 @@ static int i2c_hid_start(struct hid_device *hid)
 	i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 
 	if (bufsize > ihid->bufsize) {
+		disable_irq(client->irq);
 		i2c_hid_free_buffers(ihid);
 
 		ret = i2c_hid_alloc_buffers(ihid, bufsize);
+		enable_irq(client->irq);
 
 		if (ret)
 			return ret;
@@ -806,18 +862,21 @@ static struct hid_ll_driver i2c_hid_ll_driver = {
 static int i2c_hid_init_irq(struct i2c_client *client)
 {
 	struct i2c_hid *ihid = i2c_get_clientdata(client);
+	unsigned long irqflags = 0;
 	int ret;
 
-	dev_dbg(&client->dev, "Requesting IRQ: %d\n", ihid->irq);
+	dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 
-	ret = request_threaded_irq(ihid->irq, NULL, i2c_hid_irq,
-			IRQF_TRIGGER_LOW | IRQF_ONESHOT,
-			client->name, ihid);
+	if (!irq_get_trigger_type(client->irq))
+		irqflags = IRQF_TRIGGER_LOW;
+
+	ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
+				   irqflags | IRQF_ONESHOT, client->name, ihid);
 	if (ret < 0) {
 		dev_warn(&client->dev,
 			"Could not register for %s interrupt, irq = %d,"
 			" ret = %d\n",
-			client->name, ihid->irq, ret);
+			client->name, client->irq, ret);
 
 		return ret;
 	}
@@ -864,14 +923,6 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 }
 
 #ifdef CONFIG_ACPI
-
-/* Default GPIO mapping */
-static const struct acpi_gpio_params i2c_hid_irq_gpio = { 0, 0, true };
-static const struct acpi_gpio_mapping i2c_hid_acpi_gpios[] = {
-	{ "gpios", &i2c_hid_irq_gpio, 1 },
-	{ },
-};
-
 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 		struct i2c_hid_platform_data *pdata)
 {
@@ -882,7 +933,6 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
 	union acpi_object *obj;
 	struct acpi_device *adev;
 	acpi_handle handle;
-	int ret;
 
 	handle = ACPI_HANDLE(&client->dev);
 	if (!handle || acpi_bus_get_device(handle, &adev))
@@ -898,9 +948,7 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
 	pdata->hid_descriptor_address = obj->integer.value;
 	ACPI_FREE(obj);
 
-	/* GPIOs are optional */
-	ret = acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios);
-	return ret < 0 && ret != -ENXIO ? ret : 0;
+	return 0;
 }
 
 static const struct acpi_device_id i2c_hid_acpi_match[] = {
@@ -964,6 +1012,19 @@ static int i2c_hid_probe(struct i2c_client *client,
 
 	dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
 
+	if (!client->irq) {
+		dev_err(&client->dev,
+			"HID over i2c has not been provided an Int IRQ\n");
+		return -EINVAL;
+	}
+
+	if (client->irq < 0) {
+		if (client->irq != -EPROBE_DEFER)
+			dev_err(&client->dev,
+				"HID over i2c doesn't have a valid IRQ\n");
+		return client->irq;
+	}
+
 	ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
 	if (!ihid)
 		return -ENOMEM;
@@ -983,23 +1044,6 @@ static int i2c_hid_probe(struct i2c_client *client,
 		ihid->pdata = *platform_data;
 	}
 
-	if (client->irq > 0) {
-		ihid->irq = client->irq;
-	} else if (ACPI_COMPANION(&client->dev)) {
-		ihid->desc = gpiod_get(&client->dev, NULL, GPIOD_IN);
-		if (IS_ERR(ihid->desc)) {
-			dev_err(&client->dev, "Failed to get GPIO interrupt\n");
-			return PTR_ERR(ihid->desc);
-		}
-
-		ihid->irq = gpiod_to_irq(ihid->desc);
-		if (ihid->irq < 0) {
-			gpiod_put(ihid->desc);
-			dev_err(&client->dev, "Failed to convert GPIO to IRQ\n");
-			return ihid->irq;
-		}
-	}
-
 	i2c_set_clientdata(client, ihid);
 
 	ihid->client = client;
@@ -1050,6 +1094,8 @@ static int i2c_hid_probe(struct i2c_client *client,
 		 client->name, hid->vendor, hid->product);
 	strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
 
+	ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
+
 	ret = hid_add_device(hid);
 	if (ret) {
 		if (ret != -ENODEV)
@@ -1064,16 +1110,13 @@ err_mem_free:
 	hid_destroy_device(hid);
 
 err_irq:
-	free_irq(ihid->irq, ihid);
+	free_irq(client->irq, ihid);
 
 err_pm:
 	pm_runtime_put_noidle(&client->dev);
 	pm_runtime_disable(&client->dev);
 
 err:
-	if (ihid->desc)
-		gpiod_put(ihid->desc);
-
 	i2c_hid_free_buffers(ihid);
 	kfree(ihid);
 	return ret;
@@ -1092,18 +1135,13 @@ static int i2c_hid_remove(struct i2c_client *client)
 	hid = ihid->hid;
 	hid_destroy_device(hid);
 
-	free_irq(ihid->irq, ihid);
+	free_irq(client->irq, ihid);
 
 	if (ihid->bufsize)
 		i2c_hid_free_buffers(ihid);
 
-	if (ihid->desc)
-		gpiod_put(ihid->desc);
-
 	kfree(ihid);
 
-	acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
-
 	return 0;
 }
 
@@ -1142,11 +1180,11 @@ static int i2c_hid_suspend(struct device *dev)
 		/* Save some power */
 		i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 
-		disable_irq(ihid->irq);
+		disable_irq(client->irq);
 	}
 
 	if (device_may_wakeup(&client->dev)) {
-		wake_status = enable_irq_wake(ihid->irq);
+		wake_status = enable_irq_wake(client->irq);
 		if (!wake_status)
 			ihid->irq_wake_enabled = true;
 		else
@@ -1166,7 +1204,7 @@ static int i2c_hid_resume(struct device *dev)
 	int wake_status;
 
 	if (device_may_wakeup(&client->dev) && ihid->irq_wake_enabled) {
-		wake_status = disable_irq_wake(ihid->irq);
+		wake_status = disable_irq_wake(client->irq);
 		if (!wake_status)
 			ihid->irq_wake_enabled = false;
 		else
@@ -1179,7 +1217,7 @@ static int i2c_hid_resume(struct device *dev)
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
 
-	enable_irq(ihid->irq);
+	enable_irq(client->irq);
 	ret = i2c_hid_hwreset(client);
 	if (ret)
 		return ret;
@@ -1197,19 +1235,17 @@ static int i2c_hid_resume(struct device *dev)
 static int i2c_hid_runtime_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	struct i2c_hid *ihid = i2c_get_clientdata(client);
 
 	i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
-	disable_irq(ihid->irq);
+	disable_irq(client->irq);
 	return 0;
 }
 
 static int i2c_hid_runtime_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	struct i2c_hid *ihid = i2c_get_clientdata(client);
 
-	enable_irq(ihid->irq);
+	enable_irq(client->irq);
 	i2c_hid_set_power(client, I2C_HID_PWR_ON);
 	return 0;
 }