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Date: Wed, 31 Jan 2018 13:37:26 -0800
From: Darren Hart <dvhart@...radead.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: platform-driver-x86@...r.kernel.org,
AceLan Kao <acelan.kao@...onical.com>,
linux-kernel@...r.kernel.org, pali.rohar@...il.com,
Mario Limonciello <mario.limonciello@...l.com>,
Rafael Wysocki <rjw@...ysocki.net>
Subject: Re: [RFC, PATCH v1] platform/x86: intel-vbtn: Convert to pure ACPI
driver
On Wed, Jan 31, 2018 at 08:26:14PM +0200, Andy Shevchenko wrote:
> Remove code duplication by converting driver to pure ACPI one.
+Rafael
I don't see any reason *not* to do this, it seems the acpi driver model provides
some of the boilerplate stuff we were doing manually before as a platform
device. I'm scratching my head wondering why we did this as a platform-driver in
the first place now...
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> - not tested
> drivers/platform/x86/intel-vbtn.c | 93 +++++++++------------------------------
> 1 file changed, 22 insertions(+), 71 deletions(-)
>
> diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-vbtn.c
> index b703d6f5b099..7201effdf37a 100644
> --- a/drivers/platform/x86/intel-vbtn.c
> +++ b/drivers/platform/x86/intel-vbtn.c
> @@ -24,6 +24,7 @@ static const struct acpi_device_id intel_vbtn_ids[] = {
> {"INT33D6", 0},
> {"", 0},
> };
> +MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids);
>
> /* In theory, these are HID usages. */
> static const struct key_entry intel_vbtn_keymap[] = {
> @@ -47,9 +48,9 @@ struct intel_vbtn_priv {
> bool wakeup_mode;
> };
>
> -static int intel_vbtn_input_setup(struct platform_device *device)
> +static int intel_vbtn_input_setup(struct acpi_device *device)
> {
> - struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
> + struct intel_vbtn_priv *priv = acpi_driver_data(device);
> int ret;
>
> priv->input_dev = devm_input_allocate_device(&device->dev);
> @@ -60,17 +61,15 @@ static int intel_vbtn_input_setup(struct platform_device *device)
> if (ret)
> return ret;
>
> - priv->input_dev->dev.parent = &device->dev;
> priv->input_dev->name = "Intel Virtual Button driver";
> priv->input_dev->id.bustype = BUS_HOST;
>
> return input_register_device(priv->input_dev);
> }
>
> -static void notify_handler(acpi_handle handle, u32 event, void *context)
> +static void notify_handler(struct acpi_device *device, u32 event)
> {
> - struct platform_device *device = context;
> - struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
> + struct intel_vbtn_priv *priv = acpi_driver_data(device);
> unsigned int val = !(event & 1); /* Even=press, Odd=release */
> const struct key_entry *ke_rel;
> bool autorelease;
> @@ -97,10 +96,10 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
> dev_dbg(&device->dev, "unknown event index 0x%x\n", event);
> }
>
> -static int intel_vbtn_probe(struct platform_device *device)
> +static int intel_vbtn_add(struct acpi_device *device)
> {
> struct acpi_buffer vgbs_output = { ACPI_ALLOCATE_BUFFER, NULL };
> - acpi_handle handle = ACPI_HANDLE(&device->dev);
> + acpi_handle handle = acpi_device_handle(device);
> struct intel_vbtn_priv *priv;
> acpi_status status;
> int err;
> @@ -114,11 +113,11 @@ static int intel_vbtn_probe(struct platform_device *device)
> priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
> - dev_set_drvdata(&device->dev, priv);
> + device->driver_data = priv;
>
> err = intel_vbtn_input_setup(device);
> if (err) {
> - pr_err("Failed to setup Intel Virtual Button\n");
> + dev_warn(&device->dev, "Failed to setup Intel Virtual Button\n");
> return err;
> }
>
> @@ -139,33 +138,14 @@ static int intel_vbtn_probe(struct platform_device *device)
>
> kfree(vgbs_output.pointer);
>
> - status = acpi_install_notify_handler(handle,
> - ACPI_DEVICE_NOTIFY,
> - notify_handler,
> - device);
> - if (ACPI_FAILURE(status))
> - return -EBUSY;
> -
> device_init_wakeup(&device->dev, true);
> return 0;
> }
>
> -static int intel_vbtn_remove(struct platform_device *device)
> -{
> - acpi_handle handle = ACPI_HANDLE(&device->dev);
> -
> - acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);
> -
> - /*
> - * Even if we failed to shut off the event stream, we can still
> - * safely detach from the device.
> - */
> - return 0;
> -}
> -
> static int intel_vbtn_pm_prepare(struct device *dev)
> {
> - struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
> + struct acpi_device *device = to_acpi_device(dev);
> + struct intel_vbtn_priv *priv = acpi_driver_data(device);
>
> priv->wakeup_mode = true;
> return 0;
> @@ -173,7 +153,8 @@ static int intel_vbtn_pm_prepare(struct device *dev)
>
> static int intel_vbtn_pm_resume(struct device *dev)
> {
> - struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
> + struct acpi_device *device = to_acpi_device(dev);
> + struct intel_vbtn_priv *priv = acpi_driver_data(device);
>
> priv->wakeup_mode = false;
> return 0;
> @@ -186,46 +167,16 @@ static const struct dev_pm_ops intel_vbtn_pm_ops = {
> .thaw = intel_vbtn_pm_resume,
> };
>
> -static struct platform_driver intel_vbtn_pl_driver = {
> +static struct acpi_driver intel_vbtn_driver = {
> + .name = "intel-vbtn",
> + .class = ACPI_BUTTON_CLASS,
> + .ids = intel_vbtn_ids,
> + .ops = {
> + .add = intel_vbtn_add,
> + .notify = notify_handler,
> + },
> .driver = {
> - .name = "intel-vbtn",
> - .acpi_match_table = intel_vbtn_ids,
> .pm = &intel_vbtn_pm_ops,
> },
> - .probe = intel_vbtn_probe,
> - .remove = intel_vbtn_remove,
> };
> -MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids);
> -
> -static acpi_status __init
> -check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
> -{
> - const struct acpi_device_id *ids = context;
> - struct acpi_device *dev;
> -
> - if (acpi_bus_get_device(handle, &dev) != 0)
> - return AE_OK;
> -
> - if (acpi_match_device_ids(dev, ids) == 0)
> - if (acpi_create_platform_device(dev, NULL))
> - dev_info(&dev->dev,
> - "intel-vbtn: created platform device\n");
> -
> - return AE_OK;
> -}
> -
> -static int __init intel_vbtn_init(void)
> -{
> - acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
> - ACPI_UINT32_MAX, check_acpi_dev, NULL,
> - (void *)intel_vbtn_ids, NULL);
> -
> - return platform_driver_register(&intel_vbtn_pl_driver);
> -}
> -module_init(intel_vbtn_init);
> -
> -static void __exit intel_vbtn_exit(void)
> -{
> - platform_driver_unregister(&intel_vbtn_pl_driver);
> -}
> -module_exit(intel_vbtn_exit);
> +module_acpi_driver(intel_vbtn_driver);
> --
> 2.15.1
>
>
--
Darren Hart
VMware Open Source Technology Center
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