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: Simon Wood <simon@mungewell.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -55,7 +55,10 @@ struct lg4ff_device_entry {
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__u16 range;
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__u16 min_range;
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__u16 max_range;
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__u8 leds;
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#ifdef CONFIG_LEDS_CLASS
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__u8 led_state;
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struct led_classdev *led[5];
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#endif
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struct list_head list;
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void (*set_range)(struct hid_device *hid, u16 range);
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};
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@ -335,6 +338,88 @@ static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *at
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return count;
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}
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#ifdef CONFIG_LEDS_CLASS
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static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
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{
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struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
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struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
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report->field[0]->value[0] = 0xf8;
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report->field[0]->value[1] = 0x12;
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report->field[0]->value[2] = leds;
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report->field[0]->value[3] = 0x00;
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report->field[0]->value[4] = 0x00;
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report->field[0]->value[5] = 0x00;
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report->field[0]->value[6] = 0x00;
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usbhid_submit_report(hid, report, USB_DIR_OUT);
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}
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static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct device *dev = led_cdev->dev->parent;
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struct hid_device *hid = container_of(dev, struct hid_device, dev);
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struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
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struct lg4ff_device_entry *entry;
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int i, state = 0;
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if (!drv_data) {
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hid_err(hid, "Device data not found.");
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return;
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}
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entry = (struct lg4ff_device_entry *)drv_data->device_props;
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if (!entry) {
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hid_err(hid, "Device properties not found.");
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return;
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}
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for (i = 0; i < 5; i++) {
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if (led_cdev != entry->led[i])
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continue;
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state = (entry->led_state >> i) & 1;
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if (value == LED_OFF && state) {
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entry->led_state &= ~(1 << i);
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lg4ff_set_leds(hid, entry->led_state);
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} else if (value != LED_OFF && !state) {
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entry->led_state |= 1 << i;
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lg4ff_set_leds(hid, entry->led_state);
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}
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break;
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}
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}
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static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
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{
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struct device *dev = led_cdev->dev->parent;
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struct hid_device *hid = container_of(dev, struct hid_device, dev);
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struct lg_drv_data *drv_data = (struct lg_drv_data *)hid_get_drvdata(hid);
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struct lg4ff_device_entry *entry;
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int i, value = 0;
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if (!drv_data) {
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hid_err(hid, "Device data not found.");
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return LED_OFF;
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}
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entry = (struct lg4ff_device_entry *)drv_data->device_props;
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if (!entry) {
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hid_err(hid, "Device properties not found.");
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return LED_OFF;
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}
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for (i = 0; i < 5; i++)
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if (led_cdev == entry->led[i]) {
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value = (entry->led_state >> i) & 1;
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break;
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}
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return value ? LED_FULL : LED_OFF;
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}
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#endif
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int lg4ff_init(struct hid_device *hid)
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{
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struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
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@ -453,6 +538,58 @@ int lg4ff_init(struct hid_device *hid)
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if (entry->set_range != NULL)
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entry->set_range(hid, entry->range);
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#ifdef CONFIG_LEDS_CLASS
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/* register led subsystem - G27 only */
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entry->led_state = 0;
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for (j = 0; j < 5; j++)
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entry->led[j] = NULL;
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if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
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struct led_classdev *led;
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size_t name_sz;
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char *name;
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lg4ff_set_leds(hid, 0);
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name_sz = strlen(dev_name(&hid->dev)) + 8;
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for (j = 0; j < 5; j++) {
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led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
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if (!led) {
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hid_err(hid, "can't allocate memory for LED %d\n", j);
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goto err;
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}
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name = (void *)(&led[1]);
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snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
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led->name = name;
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led->brightness = 0;
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led->max_brightness = 1;
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led->brightness_get = lg4ff_led_get_brightness;
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led->brightness_set = lg4ff_led_set_brightness;
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entry->led[j] = led;
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error = led_classdev_register(&hid->dev, led);
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if (error) {
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hid_err(hid, "failed to register LED %d. Aborting.\n", j);
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err:
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/* Deregister LEDs (if any) */
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for (j = 0; j < 5; j++) {
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led = entry->led[j];
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entry->led[j] = NULL;
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if (!led)
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continue;
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led_classdev_unregister(led);
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kfree(led);
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}
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goto out; /* Let the driver continue without LEDs */
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}
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}
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}
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#endif
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out:
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hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
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return 0;
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}
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@ -474,6 +611,25 @@ int lg4ff_deinit(struct hid_device *hid)
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hid_err(hid, "Error while deinitializing device, no device properties data.\n");
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return -1;
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}
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#ifdef CONFIG_LEDS_CLASS
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{
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int j;
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struct led_classdev *led;
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/* Deregister LEDs (if any) */
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for (j = 0; j < 5; j++) {
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led = entry->led[j];
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entry->led[j] = NULL;
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if (!led)
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continue;
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led_classdev_unregister(led);
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kfree(led);
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}
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}
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#endif
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/* Deallocate memory */
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kfree(entry);
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