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HID: i2c-hid: Add support for ACPI GPIO interrupts

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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@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Mika Westerberg 2015-02-23 15:52:45 +02:00 committed by Jiri Kosina
parent c4bbb39806
commit a485923efb
1 changed files with 50 additions and 18 deletions
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68
drivers/hid/i2c-hid/i2c-hid.c
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@ -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;
};
@ -785,16 +788,16 @@ 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;
}
@ -841,6 +844,14 @@ 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)
{
@ -866,7 +877,7 @@ 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[] = {
@ -930,12 +941,6 @@ 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;
@ -955,6 +960,23 @@ 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;
@ -1017,13 +1039,16 @@ 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;
@ -1042,13 +1067,18 @@ 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;
}
@ -1060,9 +1090,9 @@ 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);
@ -1080,13 +1110,13 @@ 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);
@ -1101,17 +1131,19 @@ 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;
}