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Date: Mon, 23 Jun 2014 19:27:45 +0200
From: Johan Hovold <johan@...nel.org>
To: Janne Kanniainen <janne.kanniainen@...il.com>
Cc: johan@...nel.org, greg@...ah.com, jkosina@...e.cz,
cooloney@...il.com, linux-kernel@...r.kernel.org,
linux-leds@...r.kernel.org, linux-usb@...r.kernel.org,
linux-input@...r.kernel.org
Subject: Re: [PATCH v10] leds: USB: HID: Add support for MSI GT683R led panels
On Mon, Jun 23, 2014 at 08:16:48PM +0300, Janne Kanniainen wrote:
> This driver adds support for USB controlled led panels that exists in
> MSI GT683R laptop
>
> Signed-off-by: Janne Kanniainen <janne.kanniainen@...il.com>
> ---
> Changes in v2:
> - sorted headers to alphabetic order
> - using devm_kzalloc
> - using BIT(n)
> - using usb_control_msg instead of usb_submit_urb
> - removing unneeded code
> Changes in v3:
> - implemented as HID device
> - some cleanups and bug fixes
> Changes in v4:
> - more cleanups
> - support for selecting leds
> - suppport for selecting status
>
> Changes in v5:
> - mode attribute documented under Documentation/ABI
> - made array for led_classdev
> - led devices uses now recommended naming scheme
>
> Changes in v6:
> - flush_work added
> - using hid device name instead of hard coded gt683r
> - allocating name buffers with devm_kzalloc
>
> Changes in v7:
> - buf with for fixed
>
> Changes in v8:
> - some cleanups and bugs fixed
>
> Changes in v9:
> - few style issues fixed
>
> Changes in v10:
> - race condition fixed
> - using proper attribute group
You need to send a separate patch on top of v9, which Jiri has already
applied to his tree.
<snip>
> +static DEVICE_ATTR_RW(leds_mode);
> +
> +static struct attribute *gt683r_attributes[] = {
> + &dev_attr_leds_mode.attr,
> + NULL,
> +};
> +
> +static struct attribute_group gt683r_attribute_group = {
> + .attrs = gt683r_attributes
> +};
> +
> +static int gt683r_led_probe(struct hid_device *hdev,
> + const struct hid_device_id *id)
> +{
> + int i;
> + int ret;
> + int name_sz;
> + char *name;
> + struct gt683r_led *led;
> +
> + led = devm_kzalloc(&hdev->dev, sizeof(*led), GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> +
> + mutex_init(&led->lock);
> + INIT_WORK(&led->work, gt683r_led_work);
> +
> + led->mode = GT683R_LED_NORMAL;
> + led->hdev = hdev;
> + hid_set_drvdata(hdev, led);
> +
> + ret = hid_parse(hdev);
> + if (ret) {
> + hid_err(hdev, "hid parsing failed\n");
> + return ret;
> + }
> +
> + ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
> + if (ret) {
> + hid_err(hdev, "hw start failed\n");
> + return ret;
> + }
> +
> + for (i = 0; i < GT683R_LED_COUNT; i++) {
> + name_sz = strlen(dev_name(&hdev->dev)) +
> + strlen(gt683r_panel_names[i]) + 3;
> +
> + name = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
> + if (!name) {
> + ret = -ENOMEM;
> + goto fail;
> + }
> +
> + snprintf(name, name_sz, "%s::%s",
> + dev_name(&hdev->dev), gt683r_panel_names[i]);
> + led->led_devs[i].name = name;
> + led->led_devs[i].max_brightness = 1;
> + led->led_devs[i].brightness_set = gt683r_brightness_set;
> + ret = led_classdev_register(&hdev->dev, &led->led_devs[i]);
> + if (ret) {
> + hid_err(hdev, "could not register led device\n");
> + goto fail;
> + }
> + }
> +
> + ret = sysfs_create_group(&led->hdev->dev.kobj, >683r_attribute_group);
> + if (ret) {
> + hid_err(hdev, "failed to create sysfs attributes\n");
> + goto fail;
> + }
This does not solve the race Greg is referring to. There's some more
info here:
http://kroah.com/log/blog/2013/06/26/how-to-create-a-sysfs-file-correctly/
but I'm not sure exactly how you'd apply that to an HID driver. Perhaps
you could use the struct device_driver in struct hid_driver (although it
is currently marked as "private").
Johan
> +
> + return 0;
> +
> +fail:
> + for (i = i - 1; i >= 0; i--)
> + led_classdev_unregister(&led->led_devs[i]);
> + hid_hw_stop(hdev);
> + return ret;
> +}
> +
> +static void gt683r_led_remove(struct hid_device *hdev)
> +{
> + int i;
> + struct gt683r_led *led = hid_get_drvdata(hdev);
> +
> + sysfs_remove_group(&led->hdev->dev.kobj, >683r_attribute_group);
> + for (i = 0; i < GT683R_LED_COUNT; i++)
> + led_classdev_unregister(&led->led_devs[i]);
> + flush_work(&led->work);
> + hid_hw_stop(hdev);
> +}
> +
> +static struct hid_driver gt683r_led_driver = {
> + .probe = gt683r_led_probe,
> + .remove = gt683r_led_remove,
> + .name = "gt683r_led",
> + .id_table = gt683r_led_id,
> +};
> +
> +module_hid_driver(gt683r_led_driver);
> +
> +MODULE_AUTHOR("Janne Kanniainen");
> +MODULE_DESCRIPTION("MSI GT683R led driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 34bb220..3692d37 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -641,7 +641,7 @@
> #define USB_DEVICE_ID_GENIUS_KB29E 0x3004
>
> #define USB_VENDOR_ID_MSI 0x1770
> -#define USB_DEVICE_ID_MSI_GX680R_LED_PANEL 0xff00
> +#define USB_DEVICE_ID_MSI_GT683R_LED_PANEL 0xff00
>
> #define USB_VENDOR_ID_NATIONAL_SEMICONDUCTOR 0x0400
> #define USB_DEVICE_ID_N_S_HARMONY 0xc359
> diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
> index 8e4ddb3..c640e1d 100644
> --- a/drivers/hid/usbhid/hid-quirks.c
> +++ b/drivers/hid/usbhid/hid-quirks.c
> @@ -73,7 +73,7 @@ static const struct hid_blacklist {
> { USB_VENDOR_ID_FORMOSA, USB_DEVICE_ID_FORMOSA_IR_RECEIVER, HID_QUIRK_NO_INIT_REPORTS },
> { USB_VENDOR_ID_FREESCALE, USB_DEVICE_ID_FREESCALE_MX28, HID_QUIRK_NOGET },
> { USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS, HID_QUIRK_NOGET },
> - { USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GX680R_LED_PANEL, HID_QUIRK_NO_INIT_REPORTS },
> + { USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL, HID_QUIRK_NO_INIT_REPORTS },
> { USB_VENDOR_ID_NEXIO, USB_DEVICE_ID_NEXIO_MULTITOUCH_PTI0750, HID_QUIRK_NO_INIT_REPORTS },
> { USB_VENDOR_ID_NOVATEK, USB_DEVICE_ID_NOVATEK_MOUSE, HID_QUIRK_NO_INIT_REPORTS },
> { USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN, HID_QUIRK_NO_INIT_REPORTS },
--
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