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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@linux.intel.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
parent
c4bbb39806
commit
a485923efb
1 changed files with 50 additions and 18 deletions
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@ -37,6 +37,7 @@
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#include <linux/mutex.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c/i2c-hid.h>
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@ -144,6 +145,8 @@ struct i2c_hid {
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unsigned long flags; /* device flags */
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wait_queue_head_t wait; /* For waiting the interrupt */
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struct gpio_desc *desc;
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int irq;
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struct i2c_hid_platform_data pdata;
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};
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@ -785,16 +788,16 @@ static int i2c_hid_init_irq(struct i2c_client *client)
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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int ret;
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dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
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dev_dbg(&client->dev, "Requesting IRQ: %d\n", ihid->irq);
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ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
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ret = request_threaded_irq(ihid->irq, NULL, i2c_hid_irq,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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client->name, ihid);
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if (ret < 0) {
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dev_warn(&client->dev,
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"Could not register for %s interrupt, irq = %d,"
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" ret = %d\n",
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client->name, client->irq, ret);
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client->name, ihid->irq, ret);
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return ret;
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}
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@ -841,6 +844,14 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
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}
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#ifdef CONFIG_ACPI
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/* Default GPIO mapping */
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static const struct acpi_gpio_params i2c_hid_irq_gpio = { 0, 0, true };
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static const struct acpi_gpio_mapping i2c_hid_acpi_gpios[] = {
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{ "gpios", &i2c_hid_irq_gpio, 1 },
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{ },
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};
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static int i2c_hid_acpi_pdata(struct i2c_client *client,
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struct i2c_hid_platform_data *pdata)
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{
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@ -866,7 +877,7 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
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pdata->hid_descriptor_address = obj->integer.value;
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ACPI_FREE(obj);
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return 0;
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return acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios);
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}
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static const struct acpi_device_id i2c_hid_acpi_match[] = {
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@ -930,12 +941,6 @@ static int i2c_hid_probe(struct i2c_client *client,
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dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
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if (!client->irq) {
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dev_err(&client->dev,
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"HID over i2c has not been provided an Int IRQ\n");
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return -EINVAL;
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}
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ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
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if (!ihid)
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return -ENOMEM;
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@ -955,6 +960,23 @@ static int i2c_hid_probe(struct i2c_client *client,
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ihid->pdata = *platform_data;
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}
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if (client->irq > 0) {
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ihid->irq = client->irq;
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} else if (ACPI_COMPANION(&client->dev)) {
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ihid->desc = gpiod_get(&client->dev, NULL, GPIOD_IN);
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if (IS_ERR(ihid->desc)) {
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dev_err(&client->dev, "Failed to get GPIO interrupt\n");
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return PTR_ERR(ihid->desc);
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}
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ihid->irq = gpiod_to_irq(ihid->desc);
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if (ihid->irq < 0) {
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gpiod_put(ihid->desc);
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dev_err(&client->dev, "Failed to convert GPIO to IRQ\n");
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return ihid->irq;
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}
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}
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i2c_set_clientdata(client, ihid);
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ihid->client = client;
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@ -1017,13 +1039,16 @@ static int i2c_hid_probe(struct i2c_client *client,
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hid_destroy_device(hid);
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err_irq:
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free_irq(client->irq, ihid);
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free_irq(ihid->irq, ihid);
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err_pm:
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pm_runtime_put_noidle(&client->dev);
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pm_runtime_disable(&client->dev);
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err:
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if (ihid->desc)
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gpiod_put(ihid->desc);
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i2c_hid_free_buffers(ihid);
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kfree(ihid);
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return ret;
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@ -1042,13 +1067,18 @@ static int i2c_hid_remove(struct i2c_client *client)
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hid = ihid->hid;
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hid_destroy_device(hid);
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free_irq(client->irq, ihid);
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free_irq(ihid->irq, ihid);
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if (ihid->bufsize)
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i2c_hid_free_buffers(ihid);
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if (ihid->desc)
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gpiod_put(ihid->desc);
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kfree(ihid);
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acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev));
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return 0;
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}
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@ -1060,9 +1090,9 @@ static int i2c_hid_suspend(struct device *dev)
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struct hid_device *hid = ihid->hid;
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int ret = 0;
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disable_irq(client->irq);
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disable_irq(ihid->irq);
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if (device_may_wakeup(&client->dev))
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enable_irq_wake(client->irq);
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enable_irq_wake(ihid->irq);
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if (hid->driver && hid->driver->suspend)
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ret = hid->driver->suspend(hid, PMSG_SUSPEND);
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@ -1080,13 +1110,13 @@ static int i2c_hid_resume(struct device *dev)
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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struct hid_device *hid = ihid->hid;
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enable_irq(client->irq);
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enable_irq(ihid->irq);
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ret = i2c_hid_hwreset(client);
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if (ret)
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return ret;
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if (device_may_wakeup(&client->dev))
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disable_irq_wake(client->irq);
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disable_irq_wake(ihid->irq);
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if (hid->driver && hid->driver->reset_resume) {
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ret = hid->driver->reset_resume(hid);
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@ -1101,17 +1131,19 @@ static int i2c_hid_resume(struct device *dev)
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static int i2c_hid_runtime_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
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disable_irq(client->irq);
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disable_irq(ihid->irq);
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return 0;
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}
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static int i2c_hid_runtime_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_hid *ihid = i2c_get_clientdata(client);
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enable_irq(client->irq);
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enable_irq(ihid->irq);
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i2c_hid_set_power(client, I2C_HID_PWR_ON);
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return 0;
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}
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