HID: hid-lg4ff: Add support for G27 LEDs (22bcefdc) · Commits · 戴 / test

drivers/hid/hid-lg4ff.c

+157 −1

Original line number	Original line	Diff line number	Diff line
	@@ -55,7 +55,10 @@ struct lg4ff_device_entry {
	__u16 range;		__u16 range;
	__u16 min_range;		__u16 min_range;
	__u16 max_range;		__u16 max_range;
	__u8 leds;		#ifdef CONFIG_LEDS_CLASS
			__u8 led_state;
			struct led_classdev *led[5];
			#endif
	struct list_head list;		struct list_head list;
	void (set_range)(struct hid_device hid, u16 range);		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;		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)		int lg4ff_init(struct hid_device *hid)
	{		{
	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);		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)		if (entry->set_range != NULL)
	entry->set_range(hid, entry->range);		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");		hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
	return 0;		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");		hid_err(hid, "Error while deinitializing device, no device properties data.\n");
	return -1;		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 */		/* Deallocate memory */
	kfree(entry);		kfree(entry);

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