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Date: Mon, 23 Feb 2015 15:52:45 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Jiri Kosina <jkosina@...e.cz>
Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>,
Mark Rutland <mark.rutland@....com>, sb@...abs.hk,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] HID: i2c-hid: Add support for ACPI GPIO interrupts
The HID over I2C specification allows to have the interrupt for a HID
device to be GPIO instead of directly connected to the IO-APIC.
Add support for this so that when the driver does not find proper interrupt
number from the I2C client structure we check if it has ACPI GpioInt()
resource listed in _CRS. If it is found we convert it to an interrupt
number and use it instead.
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
drivers/hid/i2c-hid/i2c-hid.c | 68 +++++++++++++++++++++++++++++++------------
1 file changed, 50 insertions(+), 18 deletions(-)
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 404ccde49acd..c6cad72f6296 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -37,6 +37,7 @@
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/of.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c/i2c-hid.h>
@@ -144,6 +145,8 @@ struct i2c_hid {
unsigned long flags; /* device flags */
wait_queue_head_t wait; /* For waiting the interrupt */
+ struct gpio_desc *desc;
+ int irq;
struct i2c_hid_platform_data pdata;
};
@@ -790,16 +793,16 @@ static int i2c_hid_init_irq(struct i2c_client *client)
struct i2c_hid *ihid = i2c_get_clientdata(client);
int ret;
- dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
+ dev_dbg(&client->dev, "Requesting IRQ: %d\n", ihid->irq);
- ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
+ ret = request_threaded_irq(ihid->irq, NULL, i2c_hid_irq,
IRQF_TRIGGER_LOW | 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, client->irq, ret);
+ client->name, ihid->irq, ret);
return ret;
}
@@ -846,6 +849,14 @@ 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)
{
@@ -871,7 +882,7 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
pdata->hid_descriptor_address = obj->integer.value;
ACPI_FREE(obj);
- return 0;
+ return acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios);
}
static const struct acpi_device_id i2c_hid_acpi_match[] = {
@@ -935,12 +946,6 @@ 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;
- }
-
ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
if (!ihid)
return -ENOMEM;
@@ -960,6 +965,23 @@ 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;
@@ -1022,13 +1044,16 @@ err_mem_free:
hid_destroy_device(hid);
err_irq:
- free_irq(client->irq, ihid);
+ free_irq(ihid->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;
@@ -1047,13 +1072,18 @@ static int i2c_hid_remove(struct i2c_client *client)
hid = ihid->hid;
hid_destroy_device(hid);
- free_irq(client->irq, ihid);
+ free_irq(ihid->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;
}
@@ -1065,9 +1095,9 @@ static int i2c_hid_suspend(struct device *dev)
struct hid_device *hid = ihid->hid;
int ret = 0;
- disable_irq(client->irq);
+ disable_irq(ihid->irq);
if (device_may_wakeup(&client->dev))
- enable_irq_wake(client->irq);
+ enable_irq_wake(ihid->irq);
if (hid->driver && hid->driver->suspend)
ret = hid->driver->suspend(hid, PMSG_SUSPEND);
@@ -1085,13 +1115,13 @@ static int i2c_hid_resume(struct device *dev)
struct i2c_hid *ihid = i2c_get_clientdata(client);
struct hid_device *hid = ihid->hid;
- enable_irq(client->irq);
+ enable_irq(ihid->irq);
ret = i2c_hid_hwreset(client);
if (ret)
return ret;
if (device_may_wakeup(&client->dev))
- disable_irq_wake(client->irq);
+ disable_irq_wake(ihid->irq);
if (hid->driver && hid->driver->reset_resume) {
ret = hid->driver->reset_resume(hid);
@@ -1106,17 +1136,19 @@ 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(client->irq);
+ disable_irq(ihid->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(client->irq);
+ enable_irq(ihid->irq);
i2c_hid_set_power(client, I2C_HID_PWR_ON);
return 0;
}
--
2.1.4
--
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