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    Subject[PATCH] HID: hid-lg4ff: Add support for G27 LEDs
    Date
    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>
    ---
    drivers/hid/hid-lg4ff.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++-
    1 files changed, 148 insertions(+), 1 deletions(-)

    diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
    index 32c173f..8960347 100644
    --- a/drivers/hid/hid-lg4ff.c
    +++ b/drivers/hid/hid-lg4ff.c
    @@ -55,7 +55,8 @@ struct lg4ff_device_entry {
    __u16 range;
    __u16 min_range;
    __u16 max_range;
    - __u8 leds;
    + __u8 led_state;
    + struct led_classdev *led[5];
    struct list_head list;
    void (*set_range)(struct hid_device *hid, u16 range);
    };
    @@ -335,6 +336,86 @@ static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *at
    return count;
    }

    +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;
    +}
    +
    int lg4ff_init(struct hid_device *hid)
    {
    struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
    @@ -347,6 +428,9 @@ int lg4ff_init(struct hid_device *hid)
    struct usb_device_descriptor *udesc;
    int error, i, j;
    __u16 bcdDevice, rev_maj, rev_min;
    + struct led_classdev *led;
    + size_t name_sz;
    + char *name;

    /* Find the report to use */
    if (list_empty(report_list)) {
    @@ -453,14 +537,66 @@ int lg4ff_init(struct hid_device *hid)
    if (entry->set_range != NULL)
    entry->set_range(hid, entry->range);

    + /* 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) {
    + 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);
    + error = -ENOMEM;
    + 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);
    + goto err;
    + }
    + }
    +
    + dbg_hid("sysfs interface created for leds\n");
    + }
    +
    hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
    return 0;
    +
    +err:
    + /* Deregister LEDs (if any) but let the driver continue */
    + for (j = 0; j < 5; j++) {
    + led = entry->led[j];
    + entry->led[j] = NULL;
    + if (!led)
    + continue;
    + led_classdev_unregister(led);
    + kfree(led);
    + }
    +
    + return 0;
    }

    int lg4ff_deinit(struct hid_device *hid)
    {
    struct lg4ff_device_entry *entry;
    struct lg_drv_data *drv_data;
    + int j;
    + struct led_classdev *led;

    device_remove_file(&hid->dev, &dev_attr_range);

    @@ -474,6 +610,17 @@ int lg4ff_deinit(struct hid_device *hid)
    hid_err(hid, "Error while deinitializing device, no device properties data.\n");
    return -1;
    }
    +
    + /* 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);
    + }
    +
    /* Deallocate memory */
    kfree(entry);

    --
    1.7.4.1


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