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Commit 22bcefdc authored by Simon Wood's avatar Simon Wood Committed by Jiri Kosina
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HID: hid-lg4ff: Add support for G27 LEDs 



This patch adds supports for controlling the LED 'tachometer' on
the G27 wheel, via the LED subsystem.

The 5 LEDs are arranged from right (1=grn, 2=grn, 3=yel, 4=yel, 5=red)
and 'mirrored' to the left (10 LEDs in total).

Signed-off-by: default avatarSimon Wood <simon@mungewell.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 3b6b17b7

drivers/hid/hid-lg4ff.c

+157 −1
Original line number Diff line number Diff line
@@ -55,7 +55,10 @@ struct lg4ff_device_entry { 
	__u16 range;

	__u16 min_range;

	__u16 max_range;

	__u8  leds;

#ifdef CONFIG_LEDS_CLASS

	__u8  led_state;

	struct led_classdev *led[5];

#endif

	struct list_head list;

	void (*set_range)(struct hid_device *hid, u16 range);

};
@@ -335,6 +338,88 @@ static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *at 
	return count;

}



#ifdef CONFIG_LEDS_CLASS

static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)

{

	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;

	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);



	report->field[0]->value[0] = 0xf8;

	report->field[0]->value[1] = 0x12;

	report->field[0]->value[2] = leds;

	report->field[0]->value[3] = 0x00;

	report->field[0]->value[4] = 0x00;

	report->field[0]->value[5] = 0x00;

	report->field[0]->value[6] = 0x00;

	usbhid_submit_report(hid, report, USB_DIR_OUT);

}



static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,

			enum led_brightness value)

{

	struct device *dev = led_cdev->dev->parent;

	struct hid_device *hid = container_of(dev, struct hid_device, dev);

	struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);

	struct lg4ff_device_entry *entry;

	int i, state = 0;



	if (!drv_data) {

		hid_err(hid, "Device data not found.");

		return;

	}



	entry = (struct lg4ff_device_entry *)drv_data->device_props;



	if (!entry) {

		hid_err(hid, "Device properties not found.");

		return;

	}



	for (i = 0; i < 5; i++) {

		if (led_cdev != entry->led[i])

			continue;

		state = (entry->led_state >> i) & 1;

		if (value == LED_OFF && state) {

			entry->led_state &= ~(1 << i);

			lg4ff_set_leds(hid, entry->led_state);

		} else if (value != LED_OFF && !state) {

			entry->led_state |= 1 << i;

			lg4ff_set_leds(hid, entry->led_state);

		}

		break;

	}

}



static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)

{

	struct device *dev = led_cdev->dev->parent;

	struct hid_device *hid = container_of(dev, struct hid_device, dev);

	struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);

	struct lg4ff_device_entry *entry;

	int i, value = 0;



	if (!drv_data) {

		hid_err(hid, "Device data not found.");

		return LED_OFF;

	}



	entry = (struct lg4ff_device_entry *)drv_data->device_props;



	if (!entry) {

		hid_err(hid, "Device properties not found.");

		return LED_OFF;

	}



	for (i = 0; i < 5; i++)

		if (led_cdev == entry->led[i]) {

			value = (entry->led_state >> i) & 1;

			break;

		}



	return value ? LED_FULL : LED_OFF;

}

#endif



int lg4ff_init(struct hid_device *hid)

{

	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
@@ -453,6 +538,58 @@ int lg4ff_init(struct hid_device *hid) 
	if (entry->set_range != NULL)

		entry->set_range(hid, entry->range);



#ifdef CONFIG_LEDS_CLASS

	/* register led subsystem - G27 only */

	entry->led_state = 0;

	for (j = 0; j < 5; j++)

		entry->led[j] = NULL;



	if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {

		struct led_classdev *led;

		size_t name_sz;

		char *name;



		lg4ff_set_leds(hid, 0);



		name_sz = strlen(dev_name(&hid->dev)) + 8;



		for (j = 0; j < 5; j++) {

			led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);

			if (!led) {

				hid_err(hid, "can't allocate memory for LED %d\n", j);

				goto err;

			}



			name = (void *)(&led[1]);

			snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);

			led->name = name;

			led->brightness = 0;

			led->max_brightness = 1;

			led->brightness_get = lg4ff_led_get_brightness;

			led->brightness_set = lg4ff_led_set_brightness;



			entry->led[j] = led;

			error = led_classdev_register(&hid->dev, led);



			if (error) {

				hid_err(hid, "failed to register LED %d. Aborting.\n", j);

err:

				/* Deregister LEDs (if any) */

				for (j = 0; j < 5; j++) {

					led = entry->led[j];

					entry->led[j] = NULL;

					if (!led)

						continue;

					led_classdev_unregister(led);

					kfree(led);

				}

				goto out;	/* Let the driver continue without LEDs */

			}

		}

	}

#endif



out:

	hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");

	return 0;

}
@@ -474,6 +611,25 @@ int lg4ff_deinit(struct hid_device *hid) 
		hid_err(hid, "Error while deinitializing device, no device properties data.\n");

		return -1;

	}



#ifdef CONFIG_LEDS_CLASS

	{

		int j;

		struct led_classdev *led;



		/* Deregister LEDs (if any) */

		for (j = 0; j < 5; j++) {



			led = entry->led[j];

			entry->led[j] = NULL;

			if (!led)

				continue;

			led_classdev_unregister(led);

			kfree(led);

		}

	}

#endif



	/* Deallocate memory */

	kfree(entry);