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    Subject[PATCH 1/2] HID: hid-lg4ff add support for G27 LEDs
    Date
    This patch adds support for the G27 LEDs. The LEDs are controlled
    by a 5bit value (0-31) where bit0 is the right most LED, the LEDs
    are mirrored to the left.

    Arrangement on wheel is:
    G G Y Y R R(bit4) Y Y G G(bit0)

    Signed-off-by: Simon Wood <simon@mungewell.org>
    ---
    drivers/hid/hid-lg4ff.c | 84 +++++++++++++++++++++++++++++++++++++++++++++-
    1 files changed, 82 insertions(+), 2 deletions(-)

    diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
    index 6ecc9e2..4f3b744 100644
    --- a/drivers/hid/hid-lg4ff.c
    +++ b/drivers/hid/hid-lg4ff.c
    @@ -49,7 +49,12 @@ static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
    static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
    static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);

    +static void hid_lg4ff_set_leds(struct hid_device *hid, __u8 leds);
    +static ssize_t lg4ff_leds_show(struct device *dev, struct device_attribute *attr, char *buf);
    +static ssize_t lg4ff_leds_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
    +
    static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
    +static DEVICE_ATTR(leds, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_leds_show, lg4ff_leds_store);

    static bool list_inited;

    @@ -336,6 +341,67 @@ static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *at
    return count;
    }

    +/* Read current state of leds and display it in terminal */
    +static ssize_t lg4ff_leds_show(struct device *dev, struct device_attribute *attr, char *buf)
    +{
    + struct lg4ff_device_entry *uninitialized_var(entry);
    + struct list_head *h;
    + struct hid_device *hid = to_hid_device(dev);
    + size_t count;
    +
    + list_for_each(h, &device_list.list) {
    + entry = list_entry(h, struct lg4ff_device_entry, list);
    + if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
    + break;
    + }
    + if (h == &device_list.list) {
    + dbg_hid("Device not found!");
    + return 0;
    + }
    +
    + count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->leds);
    + return count;
    +}
    +
    +static ssize_t lg4ff_leds_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
    +{
    + struct lg4ff_device_entry *uninitialized_var(entry);
    + struct list_head *h;
    + struct hid_device *hid = to_hid_device(dev);
    + __u8 leds = (__u8) simple_strtoul(buf, NULL, 10) & 0x1F; /* values 0 to 31 */
    +
    + list_for_each(h, &device_list.list) {
    + entry = list_entry(h, struct lg4ff_device_entry, list);
    + if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0)
    + break;
    + }
    + if (h == &device_list.list) {
    + dbg_hid("Device not found!");
    + return count;
    + }
    +
    + /* Set leds to user specified value: 5 wide bit field for leds on right (mirrored to left) */
    + hid_lg4ff_set_leds(hid, leds);
    + entry->leds = leds;
    +
    + return count;
    +}
    +
    +static void hid_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);
    +}
    +
    int lg4ff_init(struct hid_device *hid)
    {
    struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
    @@ -446,17 +512,30 @@ int lg4ff_init(struct hid_device *hid)
    entry->set_range = lg4ff_devices[i].set_range;
    list_add(&entry->list, &device_list.list);

    - /* Create sysfs interface */
    + /* Create sysfs interface for range */
    error = device_create_file(&hid->dev, &dev_attr_range);
    if (error)
    return error;
    - dbg_hid("sysfs interface created\n");
    + dbg_hid("sysfs interface created for range\n");

    /* Set the maximum range to start with */
    entry->range = entry->max_range;
    if (entry->set_range != NULL)
    entry->set_range(hid, entry->range);

    + /* Create sysfs interface for leds - G27 only */
    + if (rev_maj == G27_REV_MAJ && rev_min == G27_REV_MIN) {
    + error = device_create_file(&hid->dev, &dev_attr_leds);
    + if (error)
    + return error;
    +
    + dbg_hid("sysfs interface created for leds\n");
    +
    + /* Turn off all leds */
    + entry->leds = 0;
    + hid_lg4ff_set_leds(hid, 0);
    + }
    +
    hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
    return 0;
    }
    @@ -483,6 +562,7 @@ int lg4ff_deinit(struct hid_device *hid)
    }

    device_remove_file(&hid->dev, &dev_attr_range);
    + device_remove_file(&hid->dev, &dev_attr_leds);
    dbg_hid("Device successfully unregistered\n");
    return 0;
    }
    --
    1.7.4.1


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